service instructions aluminized steel heat exchanger, aluminized inshot burners, lonox, gas and...

RS6610003January 2007

ServiceInstructions

80% GDT, GMP, GMPE, GMPH,GMPV, GMT, GMTH, GPD90% GMNT, GMNTE, GMNV, GMPN, GSM,GSMS, GSU

This Forced Air Central Unit Design Complies WithRequirements Embodied in The American NationalStandard / National Standard of Canada Shown Below.

ANSI Z21.47•CSA-2.3 Central Furnaces

® This manual is to be used by qualified, professionally trained HVAC technicians only.Goodman does not assume any responsibility for property damage or personal injurydue to improper service procedures or services performed by an unqualified person.

Copyright © 2000-2007 Goodman Manufacturing Company, L.P.

Models listedon pages 4-6

2

IMPORTANT INFORMATIONPride and workmanship go into every product to provide our customers with quality products. It is possible, however,that during its lifetime a product may require service. Products should be serviced only by a qualified servicetechnician who is familiar with the safety procedures required in the repair and who is equipped with the proper tools,parts, testing instruments and the appropriate service manual. REVIEW ALL SERVICE INFORMATION IN THEAPPROPRIATE SERVICE MANUAL BEFORE BEGINNING REPAIRS.

IMPORTANT NOTICES FOR CONSUMERS AND SERVICERSRECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS

IMPORTANT INFORMATION ........................... 2-3PRODUCT INFORMATION ........................... 4-12SPECIFICATIONS ....................................... 13-23DIMENSIONS ............................................... 24-27MAINTENANCE .................................................. 28

SERVICING .................................................. 30-56SERVICING TABLE OF CONTENTS ................ 32TROUBLESHOOTING ....................................... 46WIRING DIAGRAMS .................................... 58-77

WARNING

THIS UNIT SHOULD NOT BE CONNECTED TO, OR USED IN CONJUNCTION WITH, ANY DEVICES THAT ARE NOT DESIGN CERTIFIED FOR USE WITH THIS UNIT OR HAVE NOT BEENTESTED AND APPROVED BY GOODMAN. SERIOUS PROPERTY DAMAGE OR PERSONAL INJURY, REDUCED UNIT PERFORMANCE AND/OR HAZARDOUS CONDITIONS MAY RESULTFROM THE USE OF DEVICES THAT HAVE NOT BEEN APPROVED OR CERTIFED BY GOODMAN.

WARNING

TO PREVENT THE RISK OF PROPERTY DAMAGE, PERSONAL INJURY, OR DEATH,DO NOT STORE COMBUSTIBLE MATERIALS OR USE GASOLINE OR OTHERFLAMMABLE LIQUIDS OR VAPORS IN THE VICINITY OF THIS APPLIANCE.

WARNING

HIGH VOLTAGEDISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURETO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.

WARNING

GOODMAN WILL NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE PROCEDURES.IF YOU INSTALL OR PERFORM SERVICE ON THIS UNIT, YOU ASSUME RESPONSIBILITY FOR ANY PERSONAL INJURY OR PROPERTY DAMAGE WHICHMAY RESULT. MANY JURISDICTIONS REQUIRE A LICENSE TO INSTALL OR SERVICE HEATING AND AIR CONDITIONING EQUIPMENT.

TABLE OF CONTENTS

3

To locate an authorized servicer, please consult your telephone book or the dealer from whom you purchased thisproduct. For further assistance, please contact:

CONSUMER INFORMATION LINEGOODMAN® BRAND PRODUCTS

TOLL FREE 1-877-254-4729 (U.S. only)email us at: [email protected]

fax us at: (731) 856-1821(Not a technical assistance line for dealers.)

Outside the U.S., call 1-713-861-2500.(Not a technical assistance line for dealers.) Your telephone company will bill you for the call.

IMPORTANT INFORMATION

WARNING

IF THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED EXACTLY, AFIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONALINJURY OR LOSS OF LIFE.

– DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND

LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.

– WHAT TO DO IF YOU SMELL GAS:

• DO NOT TRY TO LIGHT ANY APPLIANCE.

• DO NOT TOUCH ANY ELECTRICAL SWITCH; DO NOT USE ANY

PHONE IN YOUR BUILDING.

• IMMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR’S

PHONE. FOLLOW THE GAS SUPPLIER’S INSTRUCTIONS.

• IF YOU CANNOT REACH YOUR GAS SUPPLIER, CALL THE FIRE

DEPARTMENT.– INSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED INSTALLER,

SERVICE AGENCY OR THE GAS SUPPLIER.

WARNING

SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF, TURN

OFF THE MANUAL GAS SHUTOFF VALVE EXTERNAL TO THE FURNACE BEFORE

TURNING OFF THE ELECTRICAL SUPPLY.

CARBON MONOXIDE POISONING HAZARD

-

Special Warning for Installation of Furnace or Air Handling Units inEnclosed Areas such as Garages, Utility Rooms or Parking Areas

Carbon monoxide producing devices (such as an automobile, spaceheater, gas water heater, etc.) should not be operated in enclosed areassuch as unventilated garages, utility rooms or parking areas because ofthe danger of carbon monoxide (CO) poisoning resulting from the exhaustemissions. If a furnace or air handler is installed in an enclosed area suchas a garage, utility room or parking area and a carbon monoxide producingdevice is operated therein, there must be adequate, direct outsideventilation.

This ventilation is necessary to avoid the danger of CO poisoning whichcan occur if a carbon monoxide producing device continues to operate inthe enclosed area. Carbon monoxide emissions can be (re)circulatedthroughout the structure if the furnace or air handler is operating in anymode.

CO can cause serious illness including permanent brain damage or death.

B10259-216

4

PRODUCT IDENTIFICATIONNOMENCLATURE

Engineering Revision

BRAND G: Goodman Gas Furnace

AIR FLOW DIRECTION

DESCRIPTION

T: 80% Tubular Heat Exchanger P: 80% Non-Tubular Heat Exchanger D: Downflow Position M: Multi-Position (Upflow/Horizontal)

G M T 3 * 070

MAXIMUM CFM @ 0.5" ESP 3: 1,200 4: 1,600 5: 2,000

KBTUH

GMT045-3GMT045-34GMT045-3AGMT045-3BGMT070-3GMT070-3AGMT070-3BGMT070-4GMT070-4AGMT070-4BGMT090-3GMT090-3AGMT090-3BGMT090-4

GMT090-4AGMT090-4BGMT090-5GMT090-5AGMT090-5BGMT115-5GMT115-5AGMT115-5AGMT115-5BGMT135-5GMT140-5GMT140-5AGMT140-5BGMT140-5D

GDT045-3GDT045-3AGDT045-3BGDT070-3GDT070-3AGDT070-3BGDT090-4GDT090-4AGDT090-4BGDT115-5GDT115-5AGDT115-5B

GMP050-3GMP050-32GMP050-32CGMP075-3GMP075-32GMP075-32CGMP075-4GMP100-3GMP100-4GMP100-42GMP100-42CGMP100-5GMP125-4

GMP125-5GMP125-52GMP125-52CGMP150-5GMP150-52GMP150-52C

GPD050-3GPD100-4GPD125-4

GSM060-3GSM080-4GSM100-4GSMS060-3GSMS080-4GSMS100-4

M: Multi-Position D: Dedicated Downflow P: 80% Single Stage S: 92% Single Stage

045: 45,000 050: 50,000 060: 60,000 070: 70,000 075: 75,000 090: 90,000 100: 100,000 115: 115,000 125: 125,000 140: 140,000

PRODUCT IDENTIFICATION

5

NOMENCLATURE


AIR FLOW DIRECTION M: Multi-Position D: Dedicated Downflow

DESCRIPTION

T: 80% Tubular Heat Exchanger P: 80% Non-Tubular Heat Exchanger

G M P

KBTUH

045: 45,000 070: 70,000 075: 75,000 090: 90,000 100: 100,000 115: 115,000 125: 125,000 140: 140,000


3 * 070

MAXIMUM CFM @ 0.5" ESP

BLOWER TYPE

V: Variable Speed - Single Stage E: Variable Speed - Two Stage H: High Air Flow

V

GMPV075-1.5GMPV075-3GMPV100-3GMPV100-5GMPV125-3GMPV125-5

GMPE075-3GMPE075-3AGMPE100-4GMPE100-4AGMPE125-5GMPE125-5A

GMTH045-3GMTH045-3AGMTH045-3BGMTH070-4GMTH070-4AGMTH070-4BGMTH090-5GMTH090-5BGMTH115-5

GMPH050-3GMPH075-4GMPH080-5GMPH120-5

3: 1,200 4: 1,600 5: 2,000

6

PRODUCT IDENTIFICATIONNOMENCLATURE


AIR FLOW DIRECTION

M: Upflow/Horizontal P: Position N: 92.6% Condensing

G M P

KBTUH


3 * 070

MAXIMUM CFM @ 0.5" ESP

N: 90% Condensing Furnace S: Single Stage Operation T: Single Stage - Tubular Heat Exchanger TE: Two-stage/Variable Speed - Tubular Heat Exchanger

N

GMPN040-3GMPN060-3GMPN080-4GMPN100-4GMPN120-5

GMNT040-3GMNT040-3BGMNT045-3BGMNT060-3GMNT060-3BGMNT080-4GMNT080-4BGMNT090-5AGMNT100-4GMNT100-4BGMNT120-5GMNT120-5BGMNT120-5D

GSMS060-3GSMS080-4GSMS100-4

GMNTE060-3GMNTE080-4GMNTE100-4GMNTE120-5

M: Multi-Position D: Dedicated Downflow S: 90+ Condensing Furnace

DESCRIPTION

BLOWER TYPE

3: 1,200 4: 1,600 5: 2,000

040: 40,000 060: 60,000 080: 80,000 100: 100,000 120: 120,000


7

Model # Description

GDT

80% AFUE. Downflow application, single stage, induced draft motor, psc multi-speed motor, integrated control module with diagnostics, hot surface ignition system, multiple roll out switches, pressure switches, aluminized tubular steel heat exchanger, aluminized inshot burners.

GMT

80% AFUE. Multi-position (Upflow, Horizontal Left or Right), single stage, induced draft motor, psc multi-speed motor, integrated control module with diagnostics, hot surface ignition system, roll out switches, pressure switches, aluminized tubular steel heat exchanger and inshot burners.

GMTH

80% AFUE. Multi-position (Upflow, Horizontal Left or Right), single stage, multi-position induced draft motor, psc multi-speed motor, integrated control module with diagnostics, hot surface ignition system, multiple roll out switches, pressure switches, a rotating combustion blower motor that allows venting the furnace through the top panel, right hand side panel and left hand side panel, aluminized steel heat exchanger and inshot burners.

GMP

80% AFUE. Multi-position (Upflow, Downflow, Horizontal Left or Right), single stage, induced draft motor, psc multi-speed motor, integrated control module with diagnostics, hot surface ignition system, multiple roll out switches, pressure switches, aluminized steel heat exchanger, aluminized inshot burners, LoNox.

GMPE

80% AFUE. Multi-position (Upflow, Downflow, Horizontal Left or Right), two-stage gas valve, multi-position induced draft motor, variable-speed ECM motor, integrated control module with diagnostics, hot surface ignition system, multiple roll out switches, outlet air limit switch and LoNox approved.

GMPH

80% AFUE. Multi-position (Upflow, Downflow, Horizontal Left or Right), single stage, induced draft motor, psc multi-speed motor, integrated control module with diagnostics, hot surface ignition system, multiple roll out switches, pressure switches, aluminized steel heat exchanger and inshot burners.

GMPV

80% AFUE. Multi-position (Upflow, Downflow, Horizontal Left or Right), single stage, induced draft motor, variable speed ECM motor, integrated control module with diagnostics, hot surface ignition system, multiple roll out switches, pressure switches, aluminized steel heat exchanger, aluminized inshot burners.

GPD

80% AFUE. Downflow application. Single stage, induced draft motor, psc multi-speed motor, integrated control module with diagnostics, hot surface ignition system, multiple roll out switches, pressure switches, aluminized steel heat exchanger, aluminized inshot burners, LoNox, gas and electric connections can be made on the left or right side.

8

PRODUCT IDENTIFICATIONModel # Description

GMNV90% AFUE. Multi-position (Upflow or Horizontal), single stage, induced draft motor, variable speed motor, hot surface ignition system, roll out switch, pressure switch, aluminized steel heat exchanger and aluminized inshot burners.

GMNT

92.6% AFUE. Multi-position (Upflow, Horizontal Left or Right), induced draft, psc multi-speed motor, integrated control module with diagnostics, hot surface ignition system, multiple roll out switches, pressure switches, multi-position induced draft motor, tubular heat exchanger (primary) and aluminized inshot burners.

GMNTE

92.6% AFUE. Multi-position (Upflow, Horizontal Left or Right), two-stage gas valve, two-stage induced draft motor, variable speed blower motor, integrated control module with diagnostics, hot surface ignition system, roll out switches, pressure switches, tubular heat exchanger (primary) and aluminized inshot burners, LoNOx.

GMPN

92.6% AFUE. Multi-position (Upflow, Downflow, Horizontal), single stage, induced draft motor, psc multi-speed motor, integrated control module with diagnostics, hot surface ignition system, multiple roll out switches, pressure switches, aluminized steel heat exchanger and aluminized inshot burners.

GSM92.6% AFUE. Multi-position (Upflow, Horizontal), two-stage gas valve, two-stage induced draft motor, psc multi-speed motor, integrated control module with diagnostics, hot surface ignition system, multiple roll out switches, pressure switches, aluminized

GSMS

92.6% AFUE. Multi-position (Upflow, Horizontal Left or Right), single-stage application, induced draft, psc multi-speed motor, integrated control module with diagnostics, hot surface ignition system, multiple roll out switches, pressure switches, aluminized steel heat exchanger and inshot burners.

GSU

92.6% AFUE. (Upflow Only), two0stage gas valve, induced draft motor, psc multi-speed motor, integrated control module with diagnostics, hot surface ignition system, flame roll-out switch, pressure switches, aluminized stell heat exchanger, stainless steel secondary heat exchanger and aluminized inshot burners.

9

ACCESSORIES

PLPT

-00A

LPM

-01

LPM

-03

LPM

-04

LPT-

01/0

1A

LPT-

00/0

0A

HA

-02

SVB

-80

SBM

CVK

Hon

eyw

ell S

prin

g B

1880

006

Whi

te-R

odge

rs S

prin

g B

1880

007

Orif

ice

(0.5

5) B

4089

955

Hon

eyw

ell S

prin

g B

1880

006

Whi

te-R

odge

rs S

prin

g B

1880

004

Orif

ice

(0.5

5) B

2589

900

LP G

as V

alve

B12

8261

8H

oney

wel

l Spr

ing

B18

8000

6W

hite

-Rod

gers

Spr

ing

B18

8000

7O

rific

e (1

.25)

B25

8991

25

2-S

tage

LP

Gas

Val

ve B

1282

624

Hon

eyw

ell S

prin

g B

1880

006

Whi

te-R

odge

rs S

prin

g B

1880

007

Orif

ice

(1.2

5) B

2589

9125

Hon

eyw

ell S

prin

g B

1880

006

Whi

te-R

odge

rs S

prin

g B

1880

007

Orif

ice

(1.2

5) B

4089

9125

Hon

eyw

ell S

prin

g B

1880

006

Whi

te-R

odge

rs S

prin

g B

1880

007

Orif

ice

(0.5

5) B

4089

955

Orif

ices

(6 e

a./P

AC

K)

(0.4

3) B

2589

901

/ (0.

44) B

2589

902

(0.4

5) B

2589

903

/ (0.

46) B

2589

904

(0.4

7) B

2589

905

/ (0.

48) B

2589

906

(0.4

9) B

2589

907

/ (0.

55) B

2589

900

(0.5

6) B

2589

908

/ (0.

57) B

2589

909

(0.5

8) B

2589

910

Sid

ewal

l Ven

ting

Com

bust

ible

Flo

or B

ase

Con

vent

ric V

ent K

it

GMT X X X XGMP X X X X XGDT X X XGMPH X X XGMTH X X X XGPD X X X XGMPV X X X X XGMPE X XGSM X XGSU X XGMPN X X XGMNT X XGMNTE X XGSMS X XGMPH X X X X XGMNV XGSU X X X

ModelNumberWhereUsed

ACCESSORIES

Not used in this application

10

PRODUCT IDENTIFICATION LIGHTING INSTRUCTIONSGMT

TO TURN OFF GAS TO APPLIANCE

3. Remove control access panel.appliance if service is to be performed.

or any other appliance.other flammable vapors and liquids in the vicinity of thisFOR YOUR SAFETY

6. Move the gas control switch or knob

GAS CONTROL

5. Remove control access panel.

Do not store or use gasoline or


follow the instructions "To Turn Off Gas

to "OFF". Do not force.5. Replace control access panel.

GAS CONTROL

technician or gas supplier.

or other reproductiveharm.This product contains

contains a chemical

expose you to subst-

acturer's instructions,

tion which can causeances in fuel combus-

cancer, birth defects

ess and which are

this product could

OPERATING INSTRUCTIONS

B. BEFORE OPERATING smell around

smell next to the floor because some gas

Do not touch any electric switch;

WHAT TO DO IF YOU SMELL GAS

the gas suppliers instructions.

gas, go to the next step.

9. Replace control access panel.


the control system and any gas control

tools. If the gas control switch or knobcontrol switch or knob. Never use

which has been under water.

If not ins-

ce with the manufac-

WARNING:

turers instructions

this furnace. For ass-

the user's information

This furnace must be

vice agency or thegas supplier.

ent, alteration, service

cause injury or prop-

ImproperWARNING:

FOR YOUR SAFETY READ BEFORE OPERATING

Force or attempted repair may result in

to "OFF".

PGB & PGJFor outdoor install-


11

LIGHTING INSTRUCTIONS

GMP, GMPE, GMPN, GMNT, GMTH

10. Turn on all electric power to theatically lights the burners. Do not try to


1. Set the thermostat to its lowest setting.

appliance if service is to be performed.2. Turn off all electric power to the



GAS CONTROL

KNOB

light the burners by hand.





to "OFF". Do not force.


GAS CONTROLSWITCH SHOWN IN "ON" POSITION

To Appliance" and call your service

12. If the appliance will not operate,

11. Set the thermostat to the desired


setting.

appliance.

ON

OF

F

1. STOP! Read the safety information

2. Set the thermostat to lowest setting.

3. Turn off all electric power to the appl-

4. This appliance is equipped with an automatic ignition system which autom-

A. This appliance does not have a pilot. Itis equipped with an ignition device whichautomatically lights the burners. Do not

B. BEFORE OPERATING smell aroundthe appliance area for gas. Be sure to smell next to the floor because some gasis heavier than air and will settle on the

from a neighbor's phone. Follow

do not use any telephone in yourDo not touch any electric switch;Do not try to light any appliance.


iance.

above on this label.


try to light the burners by hand.

building.Immediately call your supplier

floor.

call a qualified service technician. will not operate, don't try to repair it,

gas. If you then smell gas, STOP!




above on this label. If you don't smellFollow "B" in the safety information

7. Wait five (5) minutes to clear out any

the control system and any gas controlthe appliance and to replace any part ofa qualified service technician to inspect has been under water. Immediately callD. Do not use this appliance if any part

tools. If the gas control switch or knobcontrol switch or knob. Never useC. Use only your hand to move the gas


installed in accordan-

codes follow the


National Fuel Gas Code, ANSI Z223.1.

the absence of localand local codes. Inturers instructions


If you do not follow these instructions exactly, a fire or explosion may result causing property

If you cannot reach your gas supplier,

damage, personal injury or loss of life.

call the fire department.

For indoor installation.

a fire or explosion.Force or attempted repair may result in

to "OFF".

to "ON".

SWITCH SHOWN IN "ON" POSITION

GAS CONTROL

WARNING

WARNING: Improperinstallation, adjustm-ent, alteration, serviceor maintenance cancause injury or prop-erty damage. Refer tothe user's information manual provided with this furnace. For ass-istance or additionalinformation consult a qualified installer, ser-vice agency or thegas supplier.

WARNING: If not inst-alled, operated andmaintained in accord-ance with the manuf-acturer's instructions,this product couldexpose you to subst-ances in fuel combus-tion which can causedeath or serious illn-ess and which are known to the State ofCalifornia to causecancer, birth defectsor other reproductiveharm.This product containsfiberglass insulation.Fiberglass insulationcontains a chemicalknown by the State ofCalifornia to cause cancer.

PGB & PGJFor outdoor install-ation only.



FOR YOUR SAFETY READ BEFORE OPERATING

WARNING

12


GMP, GMPE, GMPNLIGHTING INSTRUCTIONS

10. Turn on all electric power to theatically lights the burners. Do not try to


1. Set the thermostat to its lowest setting.

appliance if service is to be performed.2. Turn off all electric power to the



light the burners by hand.





to "OFF". Do not force.


To Appliance" and call your service

12. If the appliance will not operate,

11. Set the thermostat to the desired


setting.

appliance.

1. STOP! Read the safety information

2. Set the thermostat to lowest setting.

3. Turn off all electric power to the appl-

4. This appliance is equipped with an automatic ignition system which autom-

A. This appliance does not have a pilot. Itis equipped with an ignition device whichautomatically lights the burners. Do not

B. BEFORE OPERATING smell aroundthe appliance area for gas. Be sure to smell next to the floor because some gasis heavier than air and will settle on the

from a neighbor's phone. Follow

do not use any telephone in yourDo not touch any electric switch;Do not try to light any appliance.


iance.

above on this label.


try to light the burners by hand.

building.Immediately call your supplier

floor.

call a qualified service technician. will not operate, don't try to repair it,

gas. If you then smell gas, STOP!




above on this label. If you don't smellFollow "B" in the safety information

7. Wait five (5) minutes to clear out any

the control system and any gas controlthe appliance and to replace any part ofa qualified service technician to inspect has been under water. Immediately callD. Do not use this appliance if any part

tools. If the gas control switch or knobcontrol switch or knob. Never useC. Use only your hand to move the gas


installed in accordan-

codes follow the


National Fuel Gas Code, ANSI Z223.1.

the absence of localand local codes. Inturers instructions


If you do not follow these instructions exactly, a fire or explosion may result causing property

If you cannot reach your gas supplier,

damage, personal injury or loss of life.

call the fire department.

For indoor installation.

a fire or explosion.Force or attempted repair may result in

to "OFF".

to "ON".

PGB & PGJFor outdoor install-ation only.

HIX

F

L O

R

ON

F

SC

WE

RC

EP

XXX

P,M

CO

GAS CONTROL

IN "ON" POSITIONSWITCH SHOWN

WARNING



FOR YOUR SAFETY READ BEFORE OPERATINGWARNING: Improperinstallation, adjustm-ent, alteration, serviceor maintenance cancause injury or prop-erty damage. Refer tothe user's information manual provided with this furnace. For ass-istance or additionalinformation consult a qualified installer, ser-vice agency or thegas supplier.

WARNING: If not inst-alled, operated andmaintained in accord-ance with the manuf-acturer's instructions,this product couldexpose you to subst-ances in fuel combus-tion which can causedeath or serious illn-ess and which are known to the State ofCalifornia to causecancer, birth defectsor other reproductiveharm.This product containsfiberglass insulation.Fiberglass insulationcontains a chemicalknown by the State ofCalifornia to cause cancer.

WARNING

SPECIFICATIONS

13

GMTMODEL GMT045-3 GMT070-3 GMT070-4 GMT090-3 GMT090-5 GMT090-5 GMT115-5 GMT135-5

Btuh Input (US) Natural Gas 45,000 70,000 70,000 90,000 90,000 90,000 115,000 140,000

Output (US) Natural Gas 36,000 56,000 56,000 72,000 72,000 72,000 92,000 108,000

Btuh Input (US) LP Gas 40,000 60,000 60,000 80,000 80,000 80,000 100,000 120,000

Output (US) LP Gas 32,000 48,000 48,000 64,000 64,000 64,000 80,000 96,000

A.F.U.E. 80% 80% 80% 80% 80% 80% 80% 80%

Rated External Static (" w.c.) .10 - .50 .10 - .50 .10 - .50 .10 - .50 .10 - .50 .10 - .50 .10 - .50 .10 - .50

Temperature Rise (°F) 25 - 55 25 - 55 20 - 50 35 - 65 35 - 65 35 - 65 35 - 65 45 - 75

Pressure Switch Trip Point (" w.c.) -0.60 -0.60 -0.60 -0.60 -0.60 -0.70 -0.70 -0.75

Blower Wheel (D" x W") 10 X 6 10 X 6 10 X 8 10 X 8 10 X 8 10 X 10 10 X 10 11 x 10

Blower Horsepower 1/3 1/3 1/2 1/3 1/2 1/2 1/2 3/4

Blower Speeds 3 3 3 3 3 3 3 3

Max CFM @ 0.5 E.S.P. 1438 1165 1518 1400 1532 1875 1988 2209

Power Supply 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1

Minimum Circuit Ampacity (MCA) 5.2 5.2 7.8 5.2 7.8 7.8 7.8 9.6

Maximum Overcurrent Device 15.0 15.0 15.0 15.0 15.0 15.0 15.0 15.0

Transformer (VA) 40 40 40 40 40 40 40 40

Primary Limit Setting (°F) 300 180 170 210 210 320 220 160

Auxiliary Limit Setting (°F) 120 120 120 120 120 120 120 120

Rollout Limit Setting (°F) 300 300 300 300 300 300 300 300

Fan Delay On Heating 30 secs. 30 secs. 30 secs. 30 secs. 30 secs. 30 secs. 30 secs. 30 secs.

Off Heating * 150 secs. 150 secs. 150 secs. 150 secs. 150 secs. 150 secs. 150 secs. 150 secs.

Fan Delay On Cooling 5 secs. 5 secs. 5 secs. 5 secs. 5 secs. 5 secs. 5 secs. 5 secs.

Off Cooling 60 secs. 60 secs. 60 secs. 60 secs. 60 secs. 60 secs. 60 secs. 60 secs.

Fan Delay On - Fan Only 5 secs. 5 secs. 5 secs. 5 secs. 5 secs. 5 secs. 5 secs. 5 secs.

Gas Supply Pressure (Natural/Propane) (" w.c.) 7 / 11 7 / 11 7 / 11 7 / 11 7 / 11 7 / 11 7 / 11 7 / 11

Manifold Pressure (Natural/Propane) (" w.c.) 3.5 / 10 3.5 /10 3.5 /10 3.5 / 10 3.5 / 10 3.5 / 10 3.5 / 10 3.5 / 10

Orifice Size (Natural/Propane) #43 / #55 #43 / #55 #43 / #55 #43 / #55 #43 / #55 #43 / #55 #43 / #55 #43 / #55

Number of Burners 2 3 3 4 4 4 5 6

Filter Size (in2.) Permanent 290 290 385 290 385 480 480 480

Disposable 580 580 770 580 770 960 960 960

Vent Connector Diameter (inches) 4 4 4 4 4 4 4 4

Shipping Weight (lbs.) 114 124 136 146 146 156 166 176

* Off Heating - This fan delay timing is adjustable (90, 120 or 150 seconds), 150 seconds as shipped.

1 Vent and combustion air diameters may vary depending upon vent length. Refer to furnace installation instructions.2 Minimum Circuit Ampacity = (1.25 x Circulator Blow er Amps) + ID Blow er amps.3 Maximum Overcurrent Protection refers to maximum recommended fuse or circuit breaker size.NOTES:1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.2. Gas Service Connection 1/2" FPT.3. Important: It is required to size fuses and w ires properly and make electrical connections in accordance w ith the National Electrical Code and/or all existing local codes.

14

SPECIFICATIONSMODEL GMT045-3A/B GMT070-3A/B GMT070-4A/B GMT090-3A/B GMT090-4A/B GMT090-5A/B GMT115-5A/B GMT140-5A/B




Output (US) LP Gas 32,000 48,000 48,000 64,000 64,000 64,000 80,000 96,000

A.F.U.E. 80% 80% 80% 80% 80% 80% 80% 80%







Max CFM @ 0.5 E.S.P. 1438 1165 1518 1400 1532 1875 1809 1987

Power Supply 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1



Transformer (VA) 40 40 40 40 40 40 40 40














Disposable 580 580 770 580 770 960 960 960




1 Vent and combustion air diameters may vary depending upon vent length. Refer to furnace installation instructions.2 Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps.3 Maximum Overcurrent Protection refers to maximum recommended fuse or circuit breaker size.NOTES:1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.2. Gas Service Connection 1/2" FPT.3. Important: It is required to size fuses and wires properly and make electrical connections in accordance with the National Electrical Code and/or all existing local codes.

GMT*A/B

SPECIFICATIONS

15

GMTMODEL GMT045-3 GMT070-3 GMT070-4 GMT090-3 GMT090-5 GMT090-5 GMT115-5 GMT135-5




Output (US) LP Gas 32,000 48,000 48,000 64,000 64,000 64,000 80,000 96,000

A.F.U.E. 80% 80% 80% 80% 80% 80% 80% 80%







Max CFM @ 0.5 E.S.P. 1438 1165 1518 1400 1532 1875 1988 2209

Power Supply 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1



Transformer (VA) 40 40 40 40 40 40 40 40














Disposable 580 580 770 580 770 960 960 960




1 Vent and combustion air diameters may vary depending upon vent length. Refer to furnace installation instructions.2 Minimum Circuit Ampacity = (1.25 x Circulator Blow er Amps) + ID Blow er amps.3 Maximum Overcurrent Protection refers to maximum recommended fuse or circuit breaker size.NOTES:1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.2. Gas Service Connection 1/2" FPT.3. Important: It is required to size fuses and w ires properly and make electrical connections in accordance w ith the National Electrical Code and/or all existing local codes.

16

SPECIFICATIONSMODEL GMT045-3A/B GMT070-3A/B GMT070-4A/B GMT090-3A/B GMT090-4A/B GMT090-5A/B GMT115-5A/B GMT140-5A/B




Output (US) LP Gas 32,000 48,000 48,000 64,000 64,000 64,000 80,000 96,000

A.F.U.E. 80% 80% 80% 80% 80% 80% 80% 80%







Max CFM @ 0.5 E.S.P. 1438 1165 1518 1400 1532 1875 1809 1987

Power Supply 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1



Transformer (VA) 40 40 40 40 40 40 40 40














Disposable 580 580 770 580 770 960 960 960





GMT*A/B

SPECIFICATIONS

17

GDTMODEL GDT045-3 GDT070-3 GDT090-4 GDT115-5

Btuh Input (US) Natural Gas 45,000 70,000 100,000 115,000

Output (US) Natural Gas 36,000 56,000 80,000 100,000

Btuh Input (US) LP Gas 40,000 60,000 80,000 100,000

Output (US) LP Gas 32,000 48,000 64,000 80,000

A.F.U.E. 80% 80% 80% 80%

Rated External Static (" w.c.) .10 - .50 .10 - .50 .10 - .50 .10 - .50

Temperature Rise (°F) 25 - 55 30 - 60 40 - 70 45 - 75

Pressure Switch Trip Point (" w.c.) -0.60 -0.60 -0.60 -0.70

Blower Wheel (D" x W") 10 X 6 10 X 6 10 X 8 10 X 10

Blower Horsepower 1/3 1/3 1/2 1/2

Blower Speeds 3 3 3 3

Max CFM @ 0.5 E.S.P. 1340 1225 1670 1965

Power Supply 115-60-1 115-60-1 115-60-1 115-60-1

Minimum Circuit Ampacity (MCA) 5.2 5.2 7.8 7.8

Maximum Overcurrent Device 15.0 15.0 15.0 15.0

Transformer (VA) 40 40 40 40

Primary Limit Setting (°F) 300 240 250 220

Auxiliary Limit Setting (°F) 120 120 120 120

Rollout Limit Setting (°F) 300 300 300 300

Fan Delay On Heating 30 secs. 30 secs. 30 secs. 30 secs.

Off Heating * 150 secs. 150 secs. 150 secs. 150 secs.

Fan Delay On Cooling 5 secs. 5 secs. 5 secs. 5 secs.

Off Cooling 60 secs. 60 secs. 60 secs. 60 secs.

Fan Delay On - Fan Only 5 secs. 5 secs. 5 secs. 5 secs.

Gas Supply Pressure (Natural/Propane) (" w.c.) 7 / 11 7 / 11 7 / 11 7 / 11

Manifold Pressure (Natural/Propane) (" w.c.) 3.5 / 10 3.5 /10 3.5 / 10 3.5 / 10

Orifice Size (Natural/Propane) #43 / #55 #43 / #55 #43 / #55 #43 / #55

Number of Burners 2 3 4 5

Filter Size (in2.) Permanent 290 290 385 480

Disposable 580 580 770 960

Vent Connector Diameter (inches) 4 4 4 4

Shipping Weight (lbs.) 114 124 146 168


Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps.3 Maximum Overcurrent Protection refers to maximum recommended fuse orcircuit breaker size.NOTES: 1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.

2. Gas Service Connection 1/2" FPT.3. Important: It is required to size fuses and wires properly and make electrical connections in accordance with the National Electrical Code

and/or all existing local codes.

18

SPECIFICATIONS GDT-AMODEL GDT045-3A GDT070-3A GDT090-4A GDT115-5A




Output (US) LP Gas 32,000 48,000 64,000 80,000

A.F.U.E. 80% 80% 80% 80%







Max CFM @ 0.5 E.S.P. 1340 1225 1670 1965

Power Supply 115-60-1 115-60-1 115-60-1 115-60-1

















Disposable 580 580 770 960







SPECIFICATIONS

19

GDT-BMODEL GDT045-3B GDT070-3B GDT090-4B GDT115-5B




Output (US) LP Gas 32,000 48,000 64,000 80,000

A.F.U.E. 80% 80% 80% 80%







Max CFM @ 0.5 E.S.P. 1262 1262 1844 2134

Power Supply 115-60-1 115-60-1 115-60-1 115-60-1

















Disposable 580 580 770 960







20

SPECIFICATIONS GMTHMODEL GMTH045-3 GMTH070-3 GMTH115-5

Btuh Input (US) Natural Gas 45,000 70,000 115,000

Output (US) Natural Gas 36,000 56,000 92,000

Btuh Input (US) LP Gas 40,000 60,000 100,000

Output (US) LP Gas 32,000 48,000 80,000

A.F.U.E. 80% 80% 80%

Rated External Static (" w.c.) .10 - .50 .10 - .50 .10 - .50

Temperature Rise (°F) 15 - 45 20 - 50 35 - 65

Pressure Switch Trip Point (" w.c.) -0.60 -0.60 -1.00

Blower Wheel (D" x W") 10 X 6 11 X 8 11 X 10

Blower Horsepower 1/3 3/4 3/4

Blower Speeds 3 3 3

Max CFM @ 0.5 E.S.P. 1490 1891 2188

Power Supply 115-60-1 115-60-1 115-60-1

Minimum Circuit Ampacity (MCA) 7.8 9.6 9.6

Maximum Overcurrent Device 15.0 15.0 15.0

Transformer (VA) 40 40 40

Primary Limit Setting (°F) 230 240 300

Auxiliary Limit Setting (°F) 120 120 120

Rollout Limit Setting (°F) 300 300 300

Fan Delay On Heating 30 secs. 30 secs. 30 secs.

Off Heating * 150 secs. 150 secs. 150 secs.

Fan Delay On Cooling 5 secs. 5 secs. 5 secs.

Off Cooling 60 secs. 60 secs. 60 secs.

Fan Delay On - Fan Only 5 secs. 5 secs. 5 secs.

Gas Supply Pressure (Natural/Propane) (" w.c.) 7 / 11 7 / 11 7 / 11

Manifold Pressure (Natural/Propane) (" w.c.) 3.5 / 10 3.5 /10 3.5 / 10

Orifice Size (Natural/Propane) #43 / #55 #43 / #55 #43 / #55

Number of Burners 2 3 5

Filter Size (in2.) Permanent 290 385 480

Disposable 580 770 960

Vent Connector Diameter (inches) 4 4 4

Shipping Weight (lbs.) 114 140 170





SPECIFICATIONS

21

GMTH-A/BMODEL GMTH045-3A/B GMTH070-3A/B GMTH090-5A/B

Btuh Input (US) Natural Gas 45,000 70,000 90,000

Output (US) Natural Gas 36,000 56,000 72,000

Btuh Input (US) LP Gas 40,000 60,000 80,000

Output (US) LP Gas 32,000 48,000 64,000

A.F.U.E. 80% 80% 80%

Rated External Static (" w.c.) .10 - .50 .10 - .50 .10 - .50

Temperature Rise (°F) 15 - 45 20 - 50 35 - 65

Pressure Switch Trip Point (" w.c.) -0.60 -0.60 -0.70

Blower Wheel (D" x W") 10 X 6 10 X 8 11 X 10

Blower Horsepower 1/3 3/4 3/4

Blower Speeds 4 3 3

Max CFM @ 0.5 E.S.P. 1499 1773 2134

Power Supply 115-60-1 115-60-1 115-60-1

Minimum Circuit Ampacity (MCA) 12.5 11.8 11.8

Maximum Overcurrent Device 15.0 15.0 15.0

Transformer (VA) 40 40 40

Primary Limit Setting (°F) 230 240 240

Auxiliary Limit Setting (°F) 120 120 120

Rollout Limit Setting (°F) 300 300 300

Fan Delay On Heating 30 secs. 30 secs. 30 secs.

Off Heating * 150 secs. 150 secs. 150 secs.

Fan Delay On Cooling 5 secs. 5 secs. 5 secs.

Off Cooling 60 secs. 60 secs. 60 secs.

Fan Delay On - Fan Only 5 secs. 5 secs. 5 secs.

Gas Supply Pressure (Natural/Propane) (" w.c.) 7 / 11 7 / 11 7 / 11

Manifold Pressure (Natural/Propane) (" w.c.) 3.5 / 10 3.5 /10 3.5 /10

Orifice Size (Natural/Propane) #43 / #55 #43 / #55 #43 / #55

Number of Burners 2 3 4

Filter Size (in2.) Permanent 290 385 480

Disposable 580 770 960

Vent Connector Diameter (inches) 4 4 4

Shipping Weight (lbs.) 120 130 153





22

SPECIFICATIONS

Btuh Btuh

GMP050-3 45,000 36,000 80.0 25 - 55

GMP075-3 75,000 60,000 80.0 35 - 65

GMP075-4 75,000 60,000 80.0 25 - 55

GMP100-3 100,000 80,000 80.0 45 - 75

GMP100-4 100,000 80,000 80.0 35 - 65

GMP100-5 100,000 80,000 80.0 35 - 65

GMP125-4 125,000 100,000 80.0 45 - 75

GMP125-5 125,000 100,000 80.0 45 - 75

GMP150-5 140,000 112,000 80.0 35 - 65

Natural GasHeating Capacity DOE**

AFUE

Temperature Rise Range

(°F)

ModelNumber

Natural GasInput

PERFORMANCE RATINGS

SPECIFICATION DATA

BEFORE PURCHASING THIS APPLIANCE, READ IMPORTANT ENERGY COST AND EFFICIENCY INFORMATION AVAILABLE FROM YOUR RETAILER.

Circulator Blower Filter Size (in2.)4

Size(D"xW") HP No. of

Speeds Permanent

GMP050-3 10 X 6 1/3 4 4 14 X 25 5.2 15.0 114

GMP075-3 10 X 6 1/3 4 4 14 X 25 5.2 15.0 124

GMP075-4 10 X 8 1/2 3 4 16 X 25 7.8 15.0 136

GMP100-3 10 X 8 1/3 4 4 16 X 25 5.2 15.0 146

GMP100-4 10 X 8 1/2 3 4 16 X 25 7.8 15.0 146

GMP100-5 11 X 10 3/4 3 4 20 X25 8.2 15.0 156

GMP125-4 10 x 10 1/2 3 4 20 X 25 7.8 15.0 166

GMP125-5 11 X 10 3/4 3 4 20 X 25 8.2 15.0 166

GMP150-5 10 X 6(2) 3/4 3 4* 24 X 25 9.6 15.0 176

Ship. Wt.(lbs)

MaximumOvercurrentProtection3

(Amps)

MinimumCircuit

Ampacity2

(Amps)

VentDiameter1

(in.)

ModelNumber

1 Vent and combustion air diameters may vary depending upon vent length. Refer to furnace installation instructions.2 Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps.3 Maximum Overcurrent Protection refers to maximum recommended fuse or circuit breaker size.4 Filter dimensions for bottom application. All models require 18" x 25" filter(s) for side air installations. Permanent air filters recommended. Both sides or bottom inlet(s) must be used for applications over 1800 cfm.* GMP150-5 requires 5" diameter vent in downflow configuration.NOTES:1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.2. Gas Service Connection 1/2" FPT.3. Important: It is required to size fuses and wires properly and make electrical connections in accordance with the National Electrical Code and/or all existing local codes.

GMP

SPECIFICATIONS

23

Circulator Blower Filter Size (in2.)

Size(D"xW") HP No. of

Speeds Permanent

GPD050-3 10 X 6 1/3 4 4 188 x 375 5.2 15.0 114

GPD075-3 10 X 6 1/3 4 4 275 x 555 5.2 15.0 124

GPD100-4 10 X 8 1/2 3 4 303 x 606 7.8 15.0 146

GPD125-4 10 X 10 1/2 3 4 347 x 649 7.8 15.0 166

Ship. Wt.(lbs)

MaximumOvercurrentProtection3

(Amps)

MinimumCircuit

Ampacity2

(Amps)

VentDiameter1

(in.)

ModelNumber


Input Output Input OutputGPD050-3 45,000 36,000 40,000 32,000 80.0 25 - 55

GPD075-3 75,000 60,000 60,000 48,000 80.0 30 - 60

GPD100-4 100,000 80,000 80,000 64,000 80.0 40 - 70

GPD125-4 125,000 100,000 100,000 80,000 80.0 45 - 75

Temperature RiseRange

Natural Gas (Btuh)Model Number Propane Gas DOEAFUE

BEFORE PURCHASING THIS APPLIANCE, READ IMPORTANT ENERGY COST AND EFFICIENCY INFORMATION AVAILABLE FROM YOUR RETAILER.

PERFORMANCE RATINGS

SPECIFICATION DATA

GPD

24

DIMENSIONS

1-3/8"

3-1/4"

GAS INLET

LOW VOLTAGE

ELEC.

GAS INLET

LOW VOLTAGE

ELEC.

39"

2"

12-3/4"8"

13-1/4"

A

B

14-1/4"

28"

19-5/8" 3-1/4"

3/4"

3/4" 3-1/8"

5-1/16"

10-1

/4"

Model Number A B

GMT045-3*GMT070-3* 14" 12 1/2"

GMT070-4*GMT090-3*GMT090-4*

17-1/2" 16"

GMT090-5*GMT115-5* 21" 19-1/2"

GMT140-5* 24-1/2" 23"

SW B1 0 3 6 1 1

MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS (INCHES)

*36" clearance for serviceability recommended.

Vent**Sides Rear Front*

Approved for line contact in the horizontal position.

Top

**Single Wall Vent (SW) to be used only as a connector. Refer to the venting tables outlined in the Installation Manual for additional venting requirements.

GMT

DIMENSIONS

25

4-3/8"

GAS INLET

LOW VOLTAGE

ELEC.

39"

A

B

28"

19-5/8" 3/4"

3/4"

1-3/8"

8-5/8"

GAS INLET

11-3/8"

1-7/8"

10-1/4"

14-1/4"

Model Number A B Non CombustibleFloor Base

GDT045-3*GDT070-3* 14" 12-1/2" SBT14

GDT090-4* 17-1/2" 16" SBT17

GDT115-5* 21" 19-1/2" SBT21

SW B1 0 3 6 1 1




Vent**Sides Rear Front* Top

GDT

26

DIMENSIONS

` 71.123.49

25.88

10.16

31.2799.06

11.59

20.16

51.4343.501.91

1.91

1.911.911.91

A

B

7.94

13.18

10.16

25.88

58.42

10.0012.38 (TYP)

38

SW B Horizontal Upflow1 0 3 6 1 8 1

Top




Vent**Sides Rear Front*

GMP

Model Number A B Non CombustibleFloor Base

GMP050-32GMP075-32 14" 12-1/2" SBM14

GMP100-42 17-1/2" 16" SBM17

GMP125-52 21.0" 19.5" SBGM21

GMP150-52 25 23 SBM24

DIMENSIONS

27

GMPE

10 3/16"

1 3/8" (TYP)28"

4"

12 5/16" 39"

4 9/16"

7 15/16"

20 1/4"

17 1/8" 3/4"

3/4"

A

B 3/4" 45º

3/4"

3/4"

C

10 3/16"

4"

5 3/16"

3 1/8"

3 15/16"(TYP)

4 7/8"(TYP)

15"

23"

Model Number A B C Non CombustibleFloor Base

GMPE075-3 17.5" 16.0" 16.0" SBM17

GMPE100-4GMPE125-5 21.0" 19.5" 19.5" SBM21

SW B1 0 3 6 1 1




Vent**Sides Rear Front* Top

28

MAINTENANCE

MAIN BURNER ADJUSTMENT1. The main burners should not need adjustment in most

instances. However, burner air shutters on some mod-els are provided should adjustment be necessary. Afterthe furnace has been in operation for at least five (5)minutes loosen the air shutter locking screws and closethe shutter until yellow tipped flames appear. Slowly openthe shutter until the yellow disappears. Retighten thelocking screw.

MOTOR LUBRICATION AND MAINTENANCE1. The circulating air blower is equipped with bearings that

are permanently lubricated by the motor manufacturerand require no lubrication. At the time of the monthlyfilter inspection clean the exterior of the circulating mo-tor, especially around the perimeter air holes to preventthe possibility of overheating due to an accumulation ofdust or dirt on the windings and motor casing. Dirty fil-ters will restrict the air flow over the motor windings andpossibly cause an overheating condition.

2. The induced draft vent motors are prelubricated by themotor manufacturer and require no attention.

INSPECTING / CLEANING HEAT EXCHANGERSNOTE: It is the obligation of the installer to advise the userto have the furnace inspected and cleaned annually. To cleanthe heat exchanger perform the following:1. Adjust the room thermostat to its lowest setting.2. Turn off the gas and electric supply to the furnace.

3 Remove the access control door.4. Disconnect the gas supply line attached to the gas valve.5. Remove the wire connected to the gas valve.6. Remove the burner box assembly. Care must be exer-

cised to avoid damage to any components.7. Inshot burners should not require cleaning. However, if

they exhibit signs of corrosion they can be cleaned bybrushing with a stiff wire brush.

8. Remove the vent from the furnace venter blower.9. Remove the venter blower and collector box.10. With a stiff wire brush on a flexible handle and remove

any loose scale from the heat exchanger at both theflue and burner openings.

11. With a vacuum remove any loose scale dislodged andany additional debris found in the heat exchanger.

12. Visually inspect the heat exchanger cells for any fail-ures using a bright light. If any failures are discov-ered it is important to disable the furnace and no-tify the end user that it remains inoperable untilrepairs are implemented.

13. Reassemble the furnace in the reverse order. Note: Noadditional screws or wires are supplied. All componentsmust be reassembled to avoid an unsafe condition.

14. Reconnect gas supply and check for leaks using a soapsolution. If a flexible gas line is used examine it for cracksor weakness. Replace if necessary.

15. Restore electrical power.

16. Follow the lighting instructions to place the furnace intooperation.

AIR FILTERS

1. Prior to inspecting air filters, turn off the electric supplyto the appliance. Instructions for replacing filters can befound in the Installation and Operating Instructions. Donot operate the furnace without air filters in place.

2. Inspect filters monthly. Failure to change air filters regu-larly can result in permanent damage to the circulatingblower motor and adversely effect the furnace perfor-mance.

MAINTENANCE

29

IGNITION SYSTEM

1. Integrated control boards are not field servicable.2. Check for tight wire connections on the integrated con-

trol board.3. Turn off electrical power to furnace before tightening any

electrical connections.

VENT AND COMBUSTION AIR INSPECTION1. Check that the vent and vent connector are securely

attached to the furnace and show no signs of deteriora-tion or sagging.

2. Check for leaks around the fittings or joints.3. Check for proper vent pipe clearance from combustible

materials. Check vent pipe for proper venting to the out-side of the structure. Follow all local code requirementsfor proper vent piping, termination and required clear-ances.

DRAIN SYSTEM (Condensing Furnaces Only)1. Inspect the drain system during the normal monthly fil-

ter change. Any blockages should be corrected to in-sure proper operation of the furnace.

GENERAL FURNACE INSPECTIONThe preceding sections cover specific areas of maintenance;however, on a regular basis the following should be inspected:1. Return air connection(s) must be sealed to the furnace

and terminate outside the furnace room.2. The return air plenum(s) must be free of holes or other

openings and show no signs of distortion.3. The seal between the furnace and the base or flooring to

which the furnace is mounted should show no signs ofdeterioration, sags, cracks or gaps and must provide adefinite seal between the base or flooring and the fur-nace.

30

SERVICING

CUBIC FEET

1 02

34

5 6

8

7

9 1 0

23

45 6

8

7

912

34

56

8

7

9 123

45

6

8

7

9

1 Million 100 Thousand 10 Thousand 1 Thousand

One

Foot

Quarter

Foot

GAS RATE -- CUBIC FEET PER HOURSize of Test Dial Size of Test Dial

Secondsfor One

Revolution

1/4cu/ft

1/2cu/ft

1cu/ft

2cu/ft

5cu/ft

Secondsfor One

Revolution

1/4cu/ft

1/2cu/ft

1cu/ft

2cu/ft

5cu/ft

10 90 180 360 720 1800 36 25 50 100 200 50011 82 164 327 655 1636 37 -- -- 97 195 48612 75 150 300 600 1500 38 23 47 95 189 47413 69 138 277 555 1385 39 -- -- 92 185 46214 64 129 257 514 1286 40 22 45 90 180 45015 60 120 240 480 1200 41 -- -- -- 176 43916 56 113 225 450 1125 42 21 43 86 172 42917 53 106 212 424 1059 43 -- -- -- 167 41918 50 100 200 400 1000 44 -- 41 82 164 40919 47 95 189 379 947 45 20 40 80 160 40020 45 90 180 360 900 46 -- -- 78 157 39121 43 86 171 343 857 47 19 38 76 153 38322 41 82 164 327 818 48 -- -- 75 150 37523 39 78 157 313 783 49 -- -- -- 147 36724 37 75 150 300 750 50 18 36 72 144 36025 36 72 144 288 720 51 -- -- -- 141 35526 34 69 138 277 692 52 -- -- 69 138 34627 33 67 133 265 667 53 17 34 -- 136 34028 32 64 129 257 643 54 -- -- 67 133 33329 31 62 124 248 621 55 -- -- -- 131 32730 30 60 120 240 600 56 16 32 64 129 32131 -- -- 116 232 581 57 -- -- -- 126 31632 28 56 113 225 563 58 -- 31 62 124 31033 -- -- 109 218 545 59 -- -- -- 122 30534 26 53 106 212 529 60 15 30 60 120 30035 -- -- 103 206 514

SERVICING

31

Complaint No Heat Unsatisfactory Heat

POSSIBLE CAUSE

DOTS IN ANALYSISGUIDE INDICATE

"POSSIBLE CAUSE"SY

MPT

OM

Sys

tem

Will

Not

Sta

rt

Bur

ner W

on't

Igni

te

Bur

ner I

gnite

s-Lo

cks

Out

Bur

ner S

huts

Off

prio

r to

T'S

tat b

eing

Sat

isfie

d

Sho

rt C

ycle

s

Long

Cyc

les

Soo

t and

/or F

umes

Too

Muc

h H

eat

Not

Eno

ugh

Hea

t

Test MethodRemedy

See

Serv

ice

Proc

edur

e R

efer

ence

Power Failure • Test Voltage S-1

Blown Fuse • Test Voltage S-4

Loose Connection • Check Wiring S-2

Shorted or Broken Wires • Check Wiring S-3

No Low Voltage • Check Transformer S-4

Faulty Thermostat • • • • Check Thermostat S-3

Faulty Transformer • Check Transformer S-4

Poor or High Resistance Ground • Measure Ground Resistance S-13

Improper Heat Anticipator Setting • • • • Adjust Heat Anticipator Setting S-3

Improper Thermostat Location • • • • Relocate Thermostat

Faulty Limit or Roll Out Switch • • Test Control S-5 & 7

Faulty Flame Sensor • Test Flame Sensor S-14

Faulty Ignition Control • • Test Control S-13

Gas Valve or Gas Supply Shut Off • Turn Valves to On Position S-11

Faulty Induced Draft Blower • • Test Blower S-9

Broken or Shorted Ignitor • Test Ignitor S-12

Dirty Flame Sensor, Low uA • Clean Flame Sensor S-14

Flame Sensor not in Flame, Low uA • Test/Adjust Position of Flame Sensor S-14

Faulty Gas Valve • • • Replace Gas Valve S-11

Open Auxiliary Limit • • Reset Control S-6

Improper Air Flow or Distribution • • Check Duct Static S-21

Cycling on Limit • • • Check Controls & Temperature Rise S-5 & 22

Delayed Ignition • Test for Delayed Ignition S-19

Flashback • Test for Flashback S-20

Orifice Size • • • Check Orifices S-16

Gas Pressure • • • • Check Gas Pressure S-18

Cracked Heat Exchanger • Check Burner Flames S-15

Stuck Gas Valve • • • Replace Gas Valve S-11

Furnace Undersized • Replace with Proper Size Furnace

Faulty Pressure Switch • • • Test Pressure Switch S-8

Blocked or Restricted Flue • Check Flue/Drawdown Pressure S-8

Open Roll Out Switch • • Test Control S-7

Bouncing On Pressure Switch • Test Negative Pressure S-8

GAS HEATING - SERVICE ANALYSIS GUIDE

32

SERVICINGSERVICING SECTION INDEX

S-1 Checking Voltage ......................................................................................................... 33

S-2 Checking Wiring ........................................................................................................... 33

S-3A Thermostat and Wiring ................................................................................................ 33

S-3B Heating Anticipator ....................................................................................................... 34

S-3C Cooling Anticipator ....................................................................................................... 34

S-4 Checking Transformer and Control Circuit .................................................................. 34

S-5 Checking Primary Limit Control ................................................................................... 37

S-6 Checking Auxiliary Limit Control ................................................................................... 38

S-7 Checking Flame Rollout Control .................................................................................. 39

S-8 Checking Pressure Control .......................................................................................... 41

S-9 Checking Air Circulator Blower Motor or Induced Draft Blower Motor .......................... 44

S-9A Checking Variable Speed Air Circulator Blower Motor.................................................. 44

S-10 Checking Capacitor ...................................................................................................... 48

S-10A Resistance Check ........................................................................................................ 49

S-11 Checking Gas Valve ..................................................................................................... 49

S-12 Checking Hot Surface Ignitor ........................................................................................ 50

S-13 Checking Integrated Ignition Controls ........................................................................... 50

S-14 Checking Flame Sensor............................................................................................... 56

S-15 Checking Main Burners ................................................................................................ 57

SERVICING

33

S-1 CHECKING VOLTAGE

1. Remove the burner door on 80% furnace or blower com-partment door on 90% furnace to gain entry to JunctionBox.

2. Remove cover from Junction Box and gain access toincoming power lines.

With Power ON:

3. Using a voltmeter, measure the voltage across the hotand neutral connections.

NOTE: To energize the furnace, the Door Interlock Switchmust be engaged at this point.4. No reading - indicates open wiring, open fuse, no power,

or etc. from unit to fused disconnect service. Repair asneeded.

5. With ample voltage at line voltage connectors, energizethe furnace blower motor by jumpering terminals R to Gon the integrated ignition control.

6. With the blower motor in operation, the voltage shouldbe 115 volts ± 10 percent.

7. If the reading falls below the minimum voltage, checkthe line wire size. Long runs of undersized wire can causelow voltage. If wire size is adequate, notify the local powercompany of the condition.

8. After completing check and/or repair, replace JunctionBox cover and reinstall burner compartment door on 80%or blower compartment door on 90% furnace.

9. Turn on electrical power and verify proper unit operation.

S-2 CHECKING WIRING

1. Check wiring visually for signs of overheating, damagedinsulations and loose connections.

2. Using an ohmmeter to check continuity of any suspectedopen wires.

3. If any wires must be replaced, replace with AWM, 105°C.4/64 thick insulation of the same gauge or its equivalent.

S-3 CHECKING THERMOSTAT, WIRING ANDANTICIPATOR

S-3A Thermostat and Wiring

1. Remove the blower compartment door to gain access tothe thermostat low voltage wires located at the furnaceintegrated control module terminals.

2. Remove the thermostat low voltage wires at the furnacecontrol panel terminal board.

3. Jumper terminals R to W (W1 and W2) on the integratedignition control.

With Power On (and Door Interlock Switch closed):

4. Induced Draft Motor must run and pull in pressure switch.5. If the hot surface ignitor heats and at the end of the this

ignitor warm-up period the gas valve opens and the burn-ers ignite, the trouble is in the thermostat or wiring.

6. With power off, check the continuity of the thermostatand wiring. Repair or replace as necessary.

If checking the furnace in the air conditioning mode, pro-ceed as follows.7. With power off, Jumper terminals R to Y to G.8. Turn on the power.9. If the furnace blower motor starts and the condensing

unit runs, then the trouble is in the thermostat or wiring.Repair or replace as necessary.

10. After completing check and/or repair of wiring and checkand/or replacement of thermostat, reinstall blower com-partment door.


S-3B Heating AnticipatorThe heating anticipator is a wire wound adjustable heaterwhich is energized during the "ON" cycle to help preventoverheating of the conditioned space.The anticipator is a part of the thermostat and if it should failfor any reason, the thermostat must be replaced.

34

SERVICINGThe heating anticipator setting for furnaces covered in thismanual is 0.70 Amps.If the anticipator current draw is unknown, then an amp drawshould be taken to determine the anticipator setting. Usean amprobe as shown in the following drawing.

10 TURNS OFTHERMOSTAT WIRE(From "W" on thermostat)

STATIONARY JAWOF AMPROBE

READS 4 AMPSCURRENT DRAWWOULD BE .4 AMPS

Checking Heating Anticipator Current (Amp) Draw

S-3C Cooling AnticipatorThe cooling anticipator is a small heater (resistor) in thethermostat. During the "OFF" cycle it heats the bimetal el-ement helping the thermostat call for the next cooling cycle.This prevents the room temperature from rising too high be-fore the system is restarted. A properly sized anticipatorshould maintain room temperature within 1 1/2 to 2 degreesrange.The anticipator is fixed in the subbase and is not to be re-placed. If the anticipator should fail for any reason, the sub-base must be changed.

S-4 CHECKING TRANSFORMER AND CON-TROL CIRCUIT

A step-down transformer 120 volt primary to 24 volt second-ary, 40 VA (Heating and Cooling Models) supplies amplecapacity of power for either operation.

1. Remove blower compartment door to gain access to thethermostat low voltage wires located at the furnace inte-grated control module.

2. Remove the thermostat low voltage wires at the furnaceintegrated control module terminals.

With Power On (and Door Interlock Switch closed):5. Check transformer primary voltage at incoming line volt-

age connections, fuse, splices, and blower door inter-lock switch.

6. If line voltage is available to the primary side of trans-former and not at secondary side, the transformer isinoperative. Replace.

7. After completing check and/or replacement of trans-former and check and/or repair of control circuit, rein-stall blower compartment door.

8. Turn on electrical power and verify proper unit opera-tion.

S-5 CHECKING PRIMARY LIMIT CONTROLThe 80% furnaces use nonadjustable, automatic reset, pri-mary limits part # B13701(87-99) and B13709*. The illustra-tion below shows how to test limit controls. See the follow-ing note BEFORE replacing the limit control.NOTE: The following service problems could cause the pri-mary limit to open up and should be checked first:1. Low air flow. Check for dirty evaporator coil, dirty

blower wheel, blower motor not running or turning tooslow, high duct static pressure (duct system under-sized), high static air filters, return air duct or return grillesundersized.

1. Remove burner compartment door to gain access to theprimary limit.

2. Remove low voltage wires at limit control terminals.3. With an ohmmeter, test between these two terminals

as shown in the following drawing. Should read continu-ous unless heat exchanger temperature is above limitcontrol setting. If not as above, replace the control.

VOLT / OHM METER

SERVICING

35

4. After completing check and/or replacement of primarylimit control, reinstall burner compartment door.

5. Turn on electrical power and verify proper unit operation.As shown in the following drawing, limit control should readcontinuous unless the heat exchanger temperature is abovelimit control setting. If not as above, replace the control

Volt / Ohm Meter

COLORIDENTIFYING SLEEVES

Testing Primary Limit Control(GMP, GMPN Furnaces)

VOLT / OHM METER

COLORIDENTIFYING TAB

Testing Primary Limit Control(GMNT, GMT Furnaces)

6. After completing check and/or replacement of primarylimit control, reinstall burner compartment door.

7. Turn on electrical power and verify proper unit operation.To aid in identifying these controls, refer to the followingPrimary Limit Charts for temperature setting and length speci-fications.

36

SERVICING

Part Number B1370902 B1370903 B1370905 B1370908 B1370910 B1370911 B1370912 B1370914 B1370915

Open Setting °F 210 240 290 160 170 220 240 220 230

Length (Inches) 3" 3" 3" 7" 7" 3" 7" 7" 3"GMP 050-3* --- --- --- --- --- --- 1 --- ---GMP 075-3* --- --- --- 1 --- --- --- --- ---GMP 075-4* --- --- --- --- --- 1GMP 100-3* --- --- 1 --- --- --- --- --- ---GMP 100-4* --- --- 1 --- --- --- --- --- ---GMP 100-5* 1 --- --- --- --- --- --- ---GMP 125-4* 1 --- --- --- --- --- --- --- ---GMP 125-5* --- --- --- --- --- --- 1 --- ---GMP 150-5* --- --- --- --- --- --- --- 1 ---

GMPE 075-3* --- --- --- --- 1 --- --- --- ---GMPE 100-4* --- --- --- --- --- --- 1 --- ---GMPE 125-5 --- --- --- 1 --- --- --- --- ---

GMPH 050-3* --- 1 --- --- --- --- --- --- ---GMPH 075-3* --- 1 --- --- --- --- --- --- ---GMPH 080-5* --- --- --- --- 1 --- --- --- ---GMPH 120-5* --- --- --- --- --- --- --- 1 ---

GPD 050-3* --- --- --- --- --- --- 1 --- ---GPD 075-3* 1 --- --- --- --- --- --- --- ---GPD 100-4* --- --- --- --- --- --- --- --- 1GPD 125-4* --- --- --- --- --- 1 --- --- ---

80% Primary Limit ( GMP - GMPE - GMPH - GPD )

Part Number B1370187 B1370190 B1370191 B1370192 B1370193 B1370194 b1370195 B1370196 B1370919 B1370920 B1370921

Open Setting °F 160 210 220 230 240 250 300 320 170 F 180 F 240 F

Length (Inches) 3" 3" 3" 3" 3" 3" 3" 3" 7" 7" 7"GDT 045-3* --- --- --- --- --- --- 1 --- --- --- ---GDT 070-3* --- --- --- --- 1 --- --- --- --- --- ---GDT 090-4* --- --- --- --- --- 1 --- --- --- --- ---GDT 115-5* --- --- 1 --- --- --- --- --- --- --- ---

GMT 045-3* --- --- --- --- --- --- 1 --- --- --- ---GMT 070-3* --- --- --- --- --- --- --- --- 1 ---GMT 070-4* --- --- --- --- --- --- --- --- 1 --- ---GMT 090-3* --- 1 --- --- --- --- --- --- --- --- ---GMT 090-4* --- 1 --- --- --- --- --- --- --- --- ---GMT 090-5* --- --- --- --- --- --- --- 1 --- --- ---GMT 115-5* --- --- 1 --- --- --- --- --- --- --- ---GMT 135-5* 1 --- --- --- --- --- --- --- --- --- ---GMT 140-5* 1 --- --- --- --- --- --- --- --- --- ---

GMTH 045-3* --- --- --- 1 --- --- --- --- --- --- ---GMTH 070-4* --- --- --- --- --- --- --- --- --- --- 1GMTH 090-5* --- --- --- --- 1 --- --- --- --- --- ---GMTH 115-5* --- --- --- --- --- --- 1 --- --- --- ---

80% Primary Limit ( GDT - GMT - GMTH )

SERVICING

37

Part Number B1370187 B1370188 B1370189 B1370190 B1370906 B1370908 B1370909 B1370910Open Setting °F 160 170 200 210 150 160 160 170Length (Inches) 3" 3" 3" 3" 7" 7" 3" 7"GMPN 040-3* --- --- --- --- 1 --- --- ---GMPN 060-3* --- --- --- --- --- 1 --- ---GMPN 080-4* --- --- --- --- --- 1 --- ---GMPN 100-4* --- --- --- --- --- --- --- 1GMPN 120-5* --- --- --- --- --- 1 --- ---

GSM 060-3 --- --- --- --- --- --- 1 ---GSM 080-4 --- --- --- --- --- 1 --- ---GSM 100-4 --- --- --- --- --- --- --- 1

GSMS 060-3 --- --- --- --- --- --- 1 ---GSMS 080-3 --- --- --- --- --- 1 --- ---GSMS 100-4 --- --- --- --- --- --- --- 1

GMNT 040-3* --- 1 --- --- --- --- --- ---GMNT 060-3* 1 --- --- --- --- --- --- ---GMNT 080-4* --- --- 1 --- --- --- --- ---GMNT 100-4* --- 1 --- --- --- --- --- ---GMNT 120-5* --- 1 --- --- --- --- --- ---

GMNTE 060-3* --- 1 --- --- --- --- --- ---GMNTE 080-4* --- 1 --- --- --- --- --- ---GMNTE 100-4* --- --- --- 1 --- --- --- ---GMNTE 120-5* --- --- --- 1 --- --- --- ---

90% Primary Limit

38

SERVICINGS-6 CHECKING AUXILIARY LIMIT CONTROLThe auxiliary limit switch (B13701-55) is a safety controlthat senses high temperature within the furnace or duct work.This control is preset to open at 120°F and close at 90°F. Itis not adjustable and automatically resets. The control islocated in the blower compartment of the furnace on theblower housing. Auxiliary limits may be on the side or frontof the blower housing.

Part Number B13701-55Open Setting °F 120GDT 045-3* 1GDT 070-3* 1GDT 090-4* 1GDT 115-5* 1

GMP 050-3* 1GMP 075-3* 1GMP 075-4* 1GMP 100-3* 1GMP 100-4* 1GMP 100-5* 1GMP 125-4* 1GMP 125-5* 1GMP 150-5* 1

GMPE 075-3* 1GMPE 100-4* 1GMPE 125-5* 1

GMPH 050-3* 1GMPH 075-3* 1GMPH 080-5* 1GMPH 120-5* 1

GMT 045-3* 1GMT 070-3* 1GMT 070-4* 1GMT 090-3* 1GMT 090-4* 1GMT 090 -5* 1GMT 115-5* 1GMT 135-5* 1GMT 140-5* 1

GMTH 045-3* 1GMTH 070-4* 1GMTH 090-5* 1GMTH115-5* 1

GPD 050-3* 1GPD 075-3* 1GPD 100-4* 1GPD 125-4* 1

80% Auxiliary Limit

Part Number B13701-55Open Setting °F 120GMPN 040-3* NAGMPN 060-3* NAGMPN 080-4* NAGMPN 100-4* NAGMPN 120-5* NA

GSM 060-3 NAGSM 080-4 NAGSM 100-4 NA

GSMS 060-3 NAGSMS 080-3 NAGSMS 100-4 NA

GMNT 040-3* 1GMNT 060-3* 1GMNT 080-4* 1GMNT 100-4* 1GMNT 120-5* 1

GMNTE 060-3* 1GMNTE 080-4* 1GMNTE 100-4* 1GMNTE 120-5* 1

90% Auxiliary Limit

AUXILIARY LIMIT CONTROL

AUXILIARY LIMIT CONTROL

BLOWER HOUSING

Auxiliary Limit Control Location(Side location shown)

GMP furnace with the edge card control board is connectedin series with the primary limit which connects to the inte-grated ignition control. Interruption of the circuit will cause a(4) flash code on the control board. These symptoms areidentical to a trip of the primary limit control. The air circula-tion blower will run continuously.

SERVICING

39

GDP, GDT, GMP, GMPE, GMNT, GMT, GMTH and GPDfurnaces using the 9-pin connector on the control board isconnected in series through the rollout switches. Interrup-tion of the circuit will cause a (1) flash code of ignitionfailure. If its temperature should be exceeded, it will open,interrupting the voltage to the gas valve causing it to close.The auxiliary limit control is designed to prevent furnaceoperation in case of main blower failure. It may also openif the power supply is interrupted while the furnace is fir-ing.

1. Remove blower compartment door to gain access tothe auxiliary limit control which is located on the blowerhousing or on the blower deck.

2. Remove the wires from the auxiliary limit control ter-minals.

3. Use an ohmmeter, test for continuity across the twoterminals (refer to the following auxiliary limit controlfigure). No reading indicates the control is open.

4. Verify proper operation of blower motor and staticpressure of duct system. Problem could be causedby a dirty evaporator coil.

VOLT / OHM METER

Testing Auxiliary Limit Control

S-7 CHECKING FLAME ROLLOUT CONTROLA temperature activated manual reset control is mountedto the manifold assembly as shown in the following illus-tration. Locations of the rollout switch may vary.

ROLLOUT SWITCH

Flame Rollout Switch Location(80% Upflow Furnace Shown, Downflow Similar)

The control is designed to open should a flame roll out occur.An over firing condition or flame impingement on the heatshield may also cause the control to open.On some models the ignition control diagnostic light will flash(1) one time indicating a trip of the rollout switch. These symp-toms are identical to a trip of the auxiliary limit control.On other models the ignition controls diagnostic light will flash(4) four times indicating an open primary limit, rollout switch,auxiliary switch or stack overtemp switch open. Check theflash codes for the model you are working on.The circuit between the ignition control and gas valve will beinterrupted when the rollout switch opens up.Refer to the Rollout Limit Charts on the next page for tem-perature settings and part numbers.

1. Remove the burner compartment door to gain access tothe rollout switch(es) mounted to burner bracket.

The servicer should reset the ignition control by opening andclosing the thermostat circuit. Then look for the ignitor glow-ing which indicates there is power to the ignition control.Measure the voltage between each side of the rollout controland ground while the ignition control tries to power the gasvalve.2. Measure the voltage between each side of the rollout con-

trol and ground during the ignition attempt. Refer to thefollowing figure.

40

SERVICING

VOLT / OHM METER

GND RED RESETBUTTON

COLORIDENTIFYING TAB

Checking Flame Rollout Switch( 80% & 90% Furnaces )

a. If no voltage is measured on either side of control itindicates ignition control or wiring to control problem.

b. If voltage is measured on one side of the control andnot the other it indicates the control is open.

c. If voltage is measured on both sides of the control thewiring to gas valve or valve is a fault.

3. After check and/or replacement of rollout switch, rein-stall burner compartment door and verify proper unit op-eration.

Part Number B13701-45 B1370154Open Setting °F 300 350 FGDT 045-3* 1 ---GDT 070-3* 1 ---GDT 090-4* 1 ---GDT 115-5* 1 ---

GMP 050-3* --- 4GMP 075-3* --- 4GMP 075-4* --- 4GMP 100-3* --- 4GMP 100-4* --- 4GMP 100-5* --- 4GMP 125-4* --- 4GMP 125-5* --- 4GMP 150-5* --- 4

GMPE 075-3* --- 4GMPE 100-4* --- 4GMPE 125-5* --- 4

GMPH 050-3* --- 4GMPH 075-3* --- 4GMPH 080-5* --- 4GMPH 120-5* --- 4

GMT 045-3* 2 ---GMT 070-3* 2 ---GMT 070-4* 2 ---GMT 090-3* 2 ---GMT 090-4* 2 ---GMT 090-5* 2 ---GMT 115-5* 2 ---GMT 135-5* 2 ---GMT 140-5* 2 ---

GMTH 045-3* 2 ---GMTH 070-4* 2 ---GMTH 090-5* 2 ---GMTH 115-5* 2 ---

GPD 050-3* --- 1GPD 075-3* --- 1GPD 100-4* --- 1GPD 125-4* --- 1

80% Rollout Limit

SERVICING

41

Part Number B13701-45 B1370154Open Setting °F 300 350 FGMPN 040-3* 4 ---GMPN 060-3* 4 ---GMPN 080-4* 4 ---GMPN 100-4* 4 ---GMPN 120-5* 4 ---

GSM 060-3 --- 2GSM 080-3 --- 2GSM 100-4 --- 2

GSMS 060-3 --- 2GSMS 080-4 --- 2GSMS 100-4 --- 2

GMNT 040-3* 4 ---GMNT 060-3* 4 ---GMNT 080-4* 4 ---GMNT 100-4* 4 ---GMNT 120-5* 4 ---

GMNTE 060-3* 4 ---GMNTE 080-4* 4 ---GMNTE 100-4* --- 4GMNTE 120-5* 4 ---

90% Rollout Limit

S-8 CHECKING PRESSURE CONTROLThe pressure control is a safety device to prevent the com-bustion cycle from occurring with inadequate venting causedby a restricted or blocked vent pipe on the 80% and 90%furnaces.

1. Remove burner compartment door to gain access to pres-sure switch(es).

2. Remove wires from the pressure switch(es) electricalterminals.

3. Using a VOM check from common terminal to NC (Nor-mally Closed) - should read closed. Check from Com-mon to NO (Normally Open) - should read open.

If switch reads as above proceed to Step 4, otherwise re-place control.4. Remove the pressure control hose from the control and

interconnect with an inclined manometer as shown inthe following figures.

INDUCED DRAFT BLOWER PRESSURE SWITCH

PRESSURE SWITCHHOSE

1/4" TEE

HOSE TO INDUCED DRAFT BLOWER TAP

INCLINED MANOMETER

OPEN TO ATMOSPHERE

INDUCEDDRAFT

BLOWER

ID Blower Pressure SwitchNegative Pressure Measurement

(80% Furnace shown for illustration purposes)

OPEN TOATMOSPHERE

INCLINED MANOMETER

HOSE TO INDUCED DRAFT BLOWER TAP

1/4" TEE

INDUCED DRAFT BLOWERPRESSURE SWITCH

PRESSURE SWITCHHOSE

INDUCEDDRAFT

BLOWER

*

*

*

* *

*

*

M 1

2

3P

C

ON

OFF

COIL COVERPRESSURE SWITCH

ID Blower Pressure SwitchNegative Pressure Measurement

(90% Furnace shown for illustration purposes)

Reconnect pressure switch electrical wires.

4. Energize furnace for heating cycle. The induced draftblower motor will begin to run. The inclined manometershould read a negative pressure.

5. Remove and check the two electrical wires and usingthe VOM check from Common to NC (Normally Closed)- should read open. Check from Common to NO (Nor-mally Open) - should read closed. If not as above, re-place control.

6. Reconnect wires to the control and place in a heatingcycle.

NOTE: See the following pages for the pressure switch trippoints and usage charts.

42

SERVICING

Low FireNegative Pressure Part # High Fire

Negative Pressure Part #

GSM 060-3 -0.38 B13701-57 -1.40 B13701-56

GSM 080-4GSM 100-4

-0.38 B13701-57 -1.10 B13701-59

PRESSURE SWITCH TRIP POINTS AND USAGE CHART

Trip Point Inches Water Column (" w.c.)

0 to 8,000 ft.MODEL

Low FireNegative Pressure

High FireNegative Pressure Part #

GMNTE 060-3* -0.60 -1.25 B13702-01

GMNTE 080-4* -0.55 -0.95 B13702-04

GMNTE 100-4* -0.35 -0.85 B13702-02

GMNTE 120-5* -0.40 -0.75 B13702-03


0 to 8,000 ft.


MODEL


GMT/GMTH/GDT 045-3*GMT/GMTH/GDT 070-3*

GMT 070-4*GMT 090-3*

GMT/GDT 090-4*

-0.60 B13701-42

GMT/GMTH 090-5*GMT/GDT 115-5*

-0.70 B13701-58

GMTH 115-5* -0.85 B13701-50

GMT 140-5* -0.75 B13701-79


MODEL 0 to 8,000 ft.


SERVICING

43


GSMS 060-3 / 080-4 / 100-4 -0.38 B13701-57

GMPN/GMNT 040-3*GMPN 060-3*

-1.19 B13701-48

GMNT 060-3*GMPN 080-4*

GMPN/GMNT 100-4*GMPN 120-5*

-0.85 B13701-50

GMNT 080-4* -1.10 B13701-59

GMNT 120-5* -0.75 B13701-79


MODEL


0 to 8,000 ft.


GMP/GMPH/GPD 050-3*GMPH 080-5GMP 100-3*

GMP/GMPE/GPD 100-4*GMP 100-5*

GMPH 120-5*GMP/GPD 125-4*

GMP/GMPE 125-5*

-0.40 B13701-26

GMP/GMPE/GPD 070-3GMP/GMPH 075-4*

-0.35 B13701-33

GMP 150-5 -0.60 B13701-42


MODEL


0 to 8,000 ft.

44

SERVICINGS-9 CHECKING AIR CIRCULATOR BLOWER

MOTOR OR INDUCED DRAFT BLOWERMOTOR

1. Remove blower compartment door to gain access to thecirculator blower motor and induced draft blower motorwire leads connected at integrated ignition control.

2. Disconnect the motor wire leads from its connection pointat integrated ignition control module and capacitor if ap-plicable.

3. Using and ohmmeter, test for continuity between eachof the motor leads.

4. Touch one probe of the ohmmeter to the motor frame(ground) and the other probe in turn to each lead.

If the windings do not test continuous or a reading is ob-tained to ground, replace the motor.5. After completing check and/or replacement of circulator

blower motor or induced draft blower motor, reinstallblower compartment door.


S-9A CHECKING VARIABLE SPEED AIR CIRCU-LATOR BLOWER MOTOR

Variable Speed furnaces incorporate the GE© ICM or vari-able speed blower motors for greater efficiency. ECM/ICMmotors vary the motor RPMs to provide a set volume of airover a wide range of conditions. These motors use an elec-tronic control module attached to the motors end bell tocontrol motor operation. Some unique features of thesemotors are:1. Constant Airflow. These motors will maintain constant

airflow in excess of .80 static. In other words, as thestatic increases so does the motors RPM so that a con-stant CFM is maintained.

NOTE: The motor in these units will move more air underhigher static conditions than a similar sized unit using aPSC motor. Because this motor does not load up and re-duce airflow like a PSC motor, in some undersized ductinstallations this may cause noise or high airflow complaints.2. Ramp-up/Ramp-down feature. These motors ramp up

and down at the beginning or end of a cycle to reduceair rush noise.

3. High voltage is present at these motors all the time.Motor operation is controlled through the low voltagemotor interface board.

ECM/ICM Control ConnectionsControl functions (G, Y, W, W1, W2) may be active at lessthan 1/2 control voltage. (i.e. 12 volts). Relay contacts oncontrol functions must reliably switch low currents (less than5 MA). Some thermostats (with triac switches) and SolidState Relays may allow enough "leakage" current to turnon "G". Thermostats that "steal" power thru "Y" or otherfunctions are not compatible.The ECM control interface can be as simple as a directconnection to the thermostat. For example: "R" to "G" willcause the fan to come at "Fan-Only" CFM, "R" to "G" to "Y"will cause the fan to come on at Cooling speed and R to Gto W will cause the fan to come on at heating speed. TheECM/ICM control requires a common connection from thetransformer (transformer common to C1, C2 on control). Intypical applications C1 and C2 will be tied together.

Checking ECM/ICM MotorsECM/ICM motors connect directly to the AC Line Voltage.DO NOT insert contactors in series with the ECM/ICM Mo-tor AC Line. The control is powered continuously to insurereliable start-up. The connector plug is polarized, verify andreverify correct connector orientation before applying power.DO NOT force plug into motor and make sure power is offbefore inserting power connector. DO NOT apply voltage toterminals 1 or 2.

Check for line voltage on terminals 4 and 5. Verify terminal3 is ground. terminals. Terminals 1 and 2 are jumpered inthe harness for 120VAC operation.

5

4

3

2

1

Lines 1 and 2 will be connected for 120VAC Power Connector applications only

Gnd

AC Line Neutral Connection

AC Line Hot Connection

}

POWER CONNECTOR(1/2 HP MOTORS)

"Motor Half“(Viewed from Plug End)

SERVICING

45

5

4

3

2

1

Lines 1 and 2 will be connected for 120VAC Power Connector applications only

Gnd

AC Line Neutral Connection

AC Line Hot Connection

}

inductor

POWER CONNECTOR(3/4 & 1 HP MOTORS)

"Motor Half“(Viewed from Plug End)

8

7

6

5

4

3

2

1

16

15

14

13

12

11

10

9

OUT -

ADJUST +/-

Y 1

COOL

DELAY

COMMON 2

W/W1

COMMON 1

OUT +

G (fan)

Y/Y2

EM HT/W2

24VAC (R)

HEAT

BK/Pwm (Speed)

O (Rev Valve)

CONTROL CONNECTOR"Motor Half“

(Viewed from connector end)

Do not apply 24 volts to terminals "Out +" or "Out -".Make sure connector is fully seated.Make sure pins are fully seated in connector housing.Verify C1 and C2 are connected to transformer common.Verify "R" is connected to transformer hot.

After verifying above connections, motor can be tested byapplying 24 volts to control pins. Example: R to G will causethe fan to come at "Fan-Only" CFM, R to G to Y will causethe fan to come on at cooling speed and R to G to W willcause the fan to come on at heating speed.If motor does not respond as noted, ICM control unit is badand should be replaced.

46

SERVICING

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arra

ntie

s an

d m

ay p

rodu

ce u

nexp

ecte

d re

sults

.

*MO

ISTU

RE

CH

ECK

:-

Con

nect

ors a

re o

rient

ed "d

own"

(or a

s rec

omm

ende

dby

equ

ipm

ent m

anuf

actu

rer).

-Ar

rang

e ha

rnes

ses

with

"drip

loop

" und

er m

otor

.

-Is

con

dens

ate

drai

n pl

ugge

d?

-C

heck

for l

ow a

irflo

w (t

oo m

uch

late

nt c

apac

ity).

-C

heck

for u

nder

char

ged

cond

ition.

-C

heck

and

plu

g le

aks

in re

turn

duc

ts, c

abin

et.

Sym

ptom

Faul

t Des

crip

tion(

s)Po

ssib

le C

ause

sC

orre

ctiv

e Ac

tion

Cau

tions

and

Not

es

- M

otor

rock

s

slig

htly

whe

n st

artin

g.

- Th

is is

nor

mal

sta

rt-up

for

v

aria

ble

spee

d m

otor

.---

----

----

-

- N

o m

ovem

ent.

- M

anua

l dis

conn

ect s

witc

h of

f or

do

or s

witc

h op

en.

- B

low

n fu

se o

r circ

uit b

reak

er.

- 24

Vac

wire

s m

isw

ired.

- U

nsea

ted

pins

in w

iring

harn

ess

conn

ecto

rs.

- B

ad m

otor

/con

trol m

odul

e. -

Moi

stur

e pr

esen

t in

mot

or o

r con

trol m

odul

e.

- C

heck

230

Vac

pow

er a

t mot

or.

- C

heck

low

vol

tage

(24

Vac

R to

C) a

t mot

or.

- C

heck

low

vol

tage

con

nect

ions

(G

, Y, W

, R, C

) at m

otor

. -

Che

ck fo

r uns

eate

d pi

ns in

con

nect

ors

on

mot

or h

arne

ss.

- Te

st w

ith a

tem

pora

ry ju

mpe

r bet

wee

n R

- G

. -

- Tu

rn p

ower

OFF

prio

r to

repa

ir.

W

ait 5

min

utes

afte

r

dis

conn

ectin

g po

wer

bef

ore

o

peni

ng m

otor

. -

Han

dle

elec

troni

c m

otor

/con

trol w

ith c

are.

- M

otor

rock

s,

but w

on't

star

t.

- Lo

ose

mot

or m

ount

. -

Blo

wer

whe

el n

ot ti

ght o

n m

otor

sha

ft. -

Bad

mot

or/c

ontro

l mod

ule.

- C

heck

for l

oose

mot

or m

ount

. -

Mak

e su

re b

low

er w

heel

is ti

ght o

n sh

aft.

- P

erfo

rm m

otor

/con

trol r

epla

cem

ent c

heck

,

EC

M m

otor

s on

ly.

- Tu

rn p

ower

OFF

prio

r to

repa

ir.

W

ait 5

min

utes

afte

r

dis

conn

ectin

g po

wer

bef

ore

o

peni

ng m

otor

. -

Han

dle

elec

troni

c m

otor

/con

trol w

ith c

are.

- M

otor

osci

llate

s up

&

do

wn

whi

le

bein

g te

sted

off o

f blo

wer

.

- It

is n

orm

al fo

r mot

or to

os

cilla

te w

ith

no lo

ad o

n sh

aft.

----

----

----

- Va

ries

up a

nd d

own

or

inte

rmitt

ent.

- V

aria

tion

in 2

30 V

ac to

mot

or.

- U

nsea

ted

pins

in w

iring

har

ness

conn

ecto

rs.

- E

rratic

CFM

com

man

d fro

m

"BK

" ter

min

al.

- Im

prop

er th

erm

osta

t con

nect

ion

or s

ettin

g. -

Moi

stur

e pr

esen

t in

mot

or/c

ontro

l mod

ule.

- C

heck

line

vol

tage

for v

aria

tion

or "s

ag".

- C

heck

low

vol

tage

con

nect

ions

(G

, Y, W

, R, C

) at

m

otor

, uns

eate

d pi

ns in

mot

or

harn

ess

conn

ecto

rs.

- C

heck

-out

sys

tem

con

trols

- Th

erm

osta

t. -

Per

form

Moi

stur

e C

heck

.*

- Tu

rn p

ower

OFF

prio

r to

repa

ir.

- "H

unts

" or "

puffs

" at

hi

gh C

FM (s

peed

).

- In

corre

ct o

r dirt

y fil

ter(s

). -

Inco

rrect

sup

ply

or re

turn

duc

twor

k. -

Inco

rrect

blo

wer

spe

ed s

ettin

g.

- D

oes

rem

ovin

g pa

nel o

r filt

er

redu

ce "p

uffin

g"?

- C

heck

/repl

ace

filte

r. -

Che

ck/c

orre

ct d

uct r

estri

ctio

ns.

- A

djus

t to

corre

ct b

low

er s

peed

set

ting.

- Tu

rn p

ower

OFF

prio

r to

repa

ir.

Trou

bles

hoot

ing

Cha

rt fo

r EC

M V

aria

ble

Spee

d Ai

r Circ

ulat

or B

low

er M

otor

s

- M

otor

won

't

star

t.

- M

otor

sta

rts,

bu

t run

s

erra

tical

ly.

THIS

CH

AR

T C

ON

TIN

UED

ON

NEX

T PA

GE

SERVICING

47

NO

TE:

You

mus

t use

the

corre

ct re

plac

emen

t con

trol m

otor

mod

ule

sinc

e th

ey a

re fa

ctor

y pr

ogra

mm

ed fo

r spe

cific

ope

ratin

g m

odes

. Eve

nth

ough

they

look

alik

e, d

iffer

ent m

odul

esm

ay h

ave

com

plet

ely d

iffer

ent f

unct

iona

lity. T

he E

CM

varia

ble

spee

d m

otor

s are

curre

ntly

the

only

mot

ors t

hat c

an h

ave

the

mot

or/c

ontro

l mod

ule

repl

aced

.

IMPO

RTA

NT

NO

TE: U

sing

the

wro

ng m

otor

/con

trol m

odul

e vo

ids

all p

rodu

ct w

arra

ntie

s an

d m

ay p

rodu

ce u

nexp

ecte

d re

sults

.

*MO

ISTU

RE

CH

ECK

:-

Con

nect

ors a

re o

rient

ed "d

own"

(or a

s rec

omm

ende

dby

equ

ipm

ent m

anuf

actu

rer).

-Ar

rang

e ha

rnes

ses

with

"drip

loop

" und

er m

otor

.

-Is

con

dens

ate

drai

n pl

ugge

d?

-C

heck

for l

ow a

irflo

w (t

oo m

uch

late

nt c

apac

ity).

-C

heck

for u

nder

char

ged

cond

ition.

-C

heck

and

plu

g le

aks

in re

turn

duc

ts, c

abin

et.

THIS

CH

AR

T C

ON

TIN

UED

FR

OM

PR

EVIO

US

PAG

E

Sym

ptom

Faul

t Des

crip

tion(

s)Po

ssib

le C

ause

sC

orre

ctiv

e Ac

tion

Cau

tions

and

Not

es

- S

tays

at l

ow C

FM d

espi

te

syst

em c

all f

or c

ool

or

hea

t CFM

.

- 24

Vac

wire

s m

isw

ired

or lo

ose.

- "R

" mis

sing

/not

con

nect

ed a

t mot

or.

- Fa

n in

del

ay m

ode.

- C

heck

low

vol

tage

(The

rmos

tat)

w

ires

and

conn

ectio

ns.

- V

erify

fan

is n

ot in

del

ay m

ode

-

wai

t unt

il de

lay

com

plet

e. -

Per

form

mot

or/c

ontro

l rep

lace

men

t

chec

k, E

CM

mot

ors

only

.

- Tu

rn p

ower

OFF

prio

r to

repa

ir.

W

ait 5

min

utes

afte

r

dis

conn

ectin

g po

wer

bef

ore

o

peni

ng m

otor

. -

Han

dle

elec

troni

c m

otor

/con

trol

w

ith c

are.

- S

tays

at h

igh

CFM

. -

"R" m

issi

ng/n

ot c

onne

cted

at m

otor

. -

Fan

in d

elay

mod

e.

- Is

fan

in d

elay

mod

e? -

wai

t unt

il de

lay

time

com

plet

e. -

Per

form

mot

or/c

ontro

l rep

lace

men

t che

ck, E

CM

m

otor

s on

ly.

- Tu

rn p

ower

OFF

prio

r to

repa

ir.

W

ait 5

min

utes

afte

r

dis

conn

ectin

g po

wer

bef

ore

o

peni

ng m

otor

. -

Han

dle

elec

troni

c m

otor

/con

trol

w

ith c

are.

- B

low

er w

on't

shut

off.

- C

urre

nt le

akag

e fro

m c

ontro

ls

into

G, Y

, or W

. -

Che

ck fo

r Tria

c sw

itche

d t's

tat

or

sol

id s

tate

rela

y. -

Turn

pow

er O

FF p

rior t

o re

pair.

- A

ir no

ise.

- H

igh

stat

ic c

reat

ing

high

blo

wer

spe

ed.

- In

corre

ct s

uppl

y or

retu

rn d

uctw

ork.

- In

corre

ct o

r dirt

y fil

ter(

s).

- In

corre

ct b

low

er s

peed

set

ting.

- C

heck

/repl

ace

filte

r. -

Che

ck/c

orre

ct d

uct r

estri

ctio

ns.

- A

djus

t to

corr

ect b

low

er s

peed

set

ting.

- Tu

rn p

ower

OFF

prio

r to

repa

ir.

- N

oisy

blo

wer

or c

abin

et.

- Lo

ose

blow

er h

ousi

ng, p

anel

s, e

tc.

- H

igh

stat

ic c

reat

ing

high

blo

wer

sp

eed.

- A

ir le

aks

in d

uctw

ork,

cab

inet

s,

or p

anel

s.

- C

heck

for l

oose

blo

wer

hou

sing

,

pane

ls, e

tc.

- C

heck

for a

ir w

hist

ling

thru

sea

ms

in

duct

s, c

abin

ets

or p

anel

s. -

Che

ck fo

r cab

inet

/duc

t def

orm

atio

n.

- Tu

rn p

ower

OFF

prio

r to

repa

ir.

- "H

unts

" or "

puffs

" at

hi

gh C

FM (s

peed

).

- H

igh

stat

ic c

reat

ing

high

blo

wer

spe

ed.

- In

corre

ct o

r dirt

y fil

ter(

s).

- In

corre

ct s

uppl

y or

retu

rn d

uctw

ork.

- In

corre

ct b

low

er s

peed

set

ting.

- D

oes

rem

ovin

g pa

nel o

r filt

er

redu

ce "p

uffin

g"?

- C

heck

/repl

ace

filte

r. -

Che

ck/c

orre

ct d

uct r

estri

ctio

ns.

- A

djus

t to

corr

ect b

low

er s

peed

set

ting.

- Tu

rn p

ower

OFF

prio

r to

repa

ir.

- E

vide

nce

of

Moi

stur

e.

- M

otor

failu

re o

r

mal

func

tion

has

oc

curre

d an

d m

oist

ure

is

pre

sent

.

- M

oist

ure

in m

otor

/con

trol m

odul

e. -

Rep

lace

mot

or a

nd p

erfo

rm

Moi

stur

e C

heck

.*

- Tu

rn p

ower

OFF

prio

r to

repa

ir.

W

ait 5

min

utes

afte

r

dis

conn

ectin

g po

wer

bef

ore

o

peni

ng m

otor

. -

Han

dle

elec

troni

c m

otor

/con

trol

w

ith c

are.

- E

xces

sive

no

ise.

Trou

bles

hoot

ing

Cha

rt fo

r EC

M V

aria

ble

Spee

d Ai

r Circ

ulat

or B

low

er M

otor

s

- M

otor

sta

rts,

bu

t run

s

erra

tical

ly.

48

SERVICINGReplacing ECM™ Control ModuleUse the following steps to replace the control module forthe GE© variable speed indoor blower motor.1. You must have the correct replacement module. The

controls are factory programmed for specific operatingmodes. Even though they look alike, different modulesmay have completely different functionality. Using thewrong control module voids all product warranties andmay produce unexpected results.

2. Remove all power from the unit being serviced.

Do NOT work on the motor with power applied. Wait atleast 5 minutes after disconnecting power from the equip-ment before opening the motor.

3. It is usually not necessary to remove the motor from theblower assembly. However it is recommended that thewhole blower assembly, with the motor, be removed.Unplug the two cable connectors to the motor. Thereare latches on each connector. Do not pull on the wires.The plugs remove easily when properly released.

4. Observe the flat end of the motor control module castingand located the two standard ¼" hex head bolts. Re-move these bolts from the motor while holding the con-trol module. Do not remove the two torx head screws.

5. The control module is now free of the motor but still at-tacked by a plug and cable. Carefully rotate the controlso as to gain access to the plug on the end of the cable.Squeeze the release latch and gently pull the plug outof the control module. Do not pull on the wires. Grip theplug only.

6. The control module is now completely detached from themotor. Verify with a standard ohmmeter that the resis-tance from each motor lead (in the motor plug just re-moved) to the motor shell is greater than 100k ohms.(Measure resistance to unpainted motor end plate). Ifany motor lead fails this test do not proceed to installthe control module. The motor is defective and must bereplaced. Installing the new control module will cause itto fail also.

7. Verify that the replacement control module is correct foryour application. If so, orient the new module next to themotor and carefully insert the plug removed in step 5.Be sure the plug latches. It will click when properly in-serted.

8. Install the new control module back on the motor beingcareful to engage the locating pin into the appropriatemating motor hole. Replace the two 1/4" hex head bolts.Tighten the bolts snugly. It is not necessary to over-tighten.

Note: Before replacing the blower/motor assembly, it is im-portant to look at the installation to see if some applicationfault has caused the motor to fail.Is there any evidence of water damage to the failed control?(Corrosion on the inside or outside of the casting.) If yes, domoisture check.9. Re-install the blower/motor assembly into the furnace.10. Plug the 16-pin control plug into the motor. The plug is

keyed. Make sure the connector is properly seated andlatched.

11. Plug the 5 pin power connector into the motor even thoughthe plug is keyed, observe the proper orientation. Do notforce the connector. It plugs in very easily when prop-erly oriented. Reversing this plug will cause imme-diate failure of the control module.

12. Final installation check. Make sure the motor is installedas follows:a. As far into the blower housing as possible.b. Belly bands not covering vent holes or on the control

module.c. Motor connectors should oriented as to prevent the

accumulation of moisture in the control.d. Use wire ties to create a drip loop in the motor cables.

13. The installation is now complete. Reapply power to thefurnace and verify that the new motor control module isworking properly.

S-10 CHECKING CAPACITORThe direct drive motors are of the (psc) permanent split ca-pacitor design. A run capacitor is wired across the auxiliaryand a portion of the main windings. The capacitors primaryfunction is to reduce the line current while greatly improvingthe torque characteristics of a motor. This is accomplishedby using the 90° phase relationship between the capacitorcurrent and voltage in conjunction with the motor windingsso that the motor will give two phase operation when con-nected to a single phase circuit. The capacitor also reducesthe line current to the motor by improving the power factorto the load.

SERVICING

49

Two quick ways to test a capacitor are a resistance and acapacitance check. Refer to the next two figures for propermeter connections for the resistance and capacitance test-ing of the capacitor.

S-10A Resistance Check

CAPACITOR

VOLT / OHM METER

Testing Capacitor Resistance

1. Remove blower compartment door to gain access to ca-pacitor.

2. Discharge capacitor and remove wire leads.3. Set an ohmmeter on its highest ohm scale and connect

the leads to the capacitor. A digital meter with built-incapacitance can be used or an analog meter shownabove.

a. Good Condition - indicator swings to zero andslowly returns toward infinity.

b. Shorted - indicator swings to zero and stops there- replace.

c. Open - no reading - replace. Reverse leads. Checkagain no reading - replace.

d. Reverse leads and recheck.

S-10B Capacitance Check

15 AMP FUSE

VOLT / OHM METER

AMMETER

With power On (and Door Interlock Switch closed):

Using a hookup as shown above, take the amperage andvoltage readings and use them in the formula:Capacitance (MFD)= 2650 x Amperage/Voltage4. After completing check and/or replacement of capaci-

tor, reinstall blower compartment door.5. Turn on electrical power and verify proper unit operation.

S-11 CHECKING GAS VALVEGas valves provide control of main burner gas flow, pressureregulation, and 100 percent safety shut-off.Gas valve should have 24 volts with a call for heat. If youhave 24 volts at the gas valve and it will not open, replace.No voltage at the gas valve indicates a problem somewhereelse in the system.Gas pressure on the inlet and outlet side of the gas valveshould be checked and adjusted when needed.

50

SERVICINGS-12 CHECKING HOT SURFACE IGNITORThe igniter most commonly used is the (B1401018S) 120Vsilicone carbide resistive element ignitor for ignition.

1. Remove burner compartment door to gain access to theignitor.

2. Disconnect the ignitor from the Ignition Control.3. Using an ohmmeter measure the resistance of the igni-

tor.4. Ignitor cool should read between 40 to 75 ohms.5. Reconnect ignitor.

6. Place unit in heating cycle, measure current draw ofignitor during preheat cycle.Should read approximately 4 to 4.5 amps.

7. If ignitor is receiving 115 Volts and will not light, replace.8. After check and/or replacement of hot surface ignitor,

reinstall burner compartment door and verify proper unitoperation.

B1401018S

S-13 CHECKING INTEGRATED IGNITIONCONTROLS

The furnaces are equipped with a combination ignition mod-ule and fan control. This device ignites the burners upon acall for heat. It also controls the venter blower and the vari-ous speed selections and timings of the circulating air blower.This control is located in the circulating air blower compart-ment. Upon a demand for heat the venter motor is ener-gized. After a short purge, the electronic ignition device isenergized. The burners are ignited and after a short delay,the burner flame is proven. The circulating air blower is en-ergized approximately (30) seconds after the burners areignited. A field selectable fan off timer will turn the circulat-ing air blower off.THIS CONTROL IS NOT FIELD SERVICABLE.

NOTE: Failure to earth ground the furnace, reversing theneutral and hot wire connection to the line (polarity), or ahigh resistance connection in the neutral line may causethe control to lockout due to failure to sense flame.

The ground wire must run from the furnace all the way backto the electrical panel. Proper grounding can be confirmedby disconnecting the electrical power and measuring resis-tance between the neutral (white) connection and the burnerclosest to the flame sensor. Resistance should be less than10 ohms.The ignition control is a combination electronic and electro-mechanical device and is not field repairable. Complete unitmust be replaced.

These tests must be completed within a given time framedue to the operation of the ignition control. Refer to Se-quence of Operation section of this manual.The ignition control is capable of diagnosing many furnacefailures to speed troubleshooting. A flashing red diagnosticindicator light on the control flashes a code for any discov-ered failures.When the control is powered up normally, the light will besolid red for normal operation. This can be used to test for115 volts and 24 volts to the control since both must bepresent for the light to flash. If this step fails, check for 115volts to the control, check the fuse and check the trans-former and its associated wiring.See the flash codes shown on the following pages of thismanual.

SERVICING

51

CLOSED PRESSURE

INSTALLER/SERVICEMAN

STUCK CLOSED

FLAME SENSOR

GAS PRESSURE

VENT BLOCKAGE

AUX. LIMIT OPENMAIN LIMIT OPEN

PRESSURE SWITCH

REVERSE TRANSFORMER

STICKING GAS VALVE

PRESSURE SWITCH

SECONDARY LEADSREVERSE PRIMARY

WARNING

STATUS LIGHT

RAPID CONTINUOUS

5 BLINKS

4 BLINKS

3 BLINKS

2 BLINKS

1 BLINK

ON

ADVERTISSEMENT

INCORRECT PRIMARY

FALSE FLAME SENSED

OPEN LIMIT SWITCH

FAILURE TO CLOSE

INCORRECT TWINNING

POLARITY WIRES

PRESSURE SWITCH

NORMAL OPERATION

IGNITION FAILURE

EQUIP. PROBLEM

SWITCH

GAS FLOW

GAS VALVE

VENTER

CHECK-

18" X 25"

18" X 25"

18" X 25"

18" X 25"

SIDE AIRINSTALLATION

DISCONNECT THE ELECTRICPOWER BEFORE SEVICING.

21"

24.5" 24" X 25"

20" X 25"

SIZE

17.5"

14"

DU BATIDIMENIONS

CHASSIS

16" X 25"

14" X 25"

BOTTOMAPPLICATION

THE STATUS LIGHT ON THE FURNACE CONTROL MAYBE USED AS A GUIDE TO TROUBLESHOOTING THISAPPLIANCE. STATUS LIGHT CODES ARE AS FOLLOWS:

DECONNECTER DU CIRCUIT D'ALIMENTATION ELECTRIQUE AVANT L'ENTRETIEN.INSPECTER LES FILTRES CHAQUE MOIS ET REMPLACER SI NECESSAIRE.TOUS LES FILTRES À AIR DOIVENT ÊTRE APPROUVÉS PAR LESULC OU LEUR EQUIVALENT. ON RECÒMMANDE D'UTILISER DES FILTRES ÀAIR PERMANTS. UTILISER LE TABLEAU SUIVANT POUR REMPLACER LES FILTRES ÀAIR.

INSPECT FILTERS MONTHLY ANDREPLACE WHEN NECESSARY.ALL AIR FILTERS MUST BE CERTIFIED BY ULC OR EQUIVALENT. PERMANENT AIRFILTERS ARE RECOMMENDED.WHEN REPLACING AIR FILTERS,USE THE FOLLOWING CHART:

INSTALLÉSUR DESSOUS

INSTALLÉSUR LE CÔTÉ

GDT, GMNT, GMP, GMPN, GMT, GMTH, GMNT, GSMSFLASH CODES

52

SERVICING

STUCK CLOSED

FLAME SENSOR

GAS PRESSURE

VENT BLOCKAGE

MAIN, ROLLOUT, AUX,

PRESSURE SWITCH

115 V POLARITY

PRESSURE SWITCH

STATUS LIGHT

6 BLINKS

4 BLINKS

3 BLINKS

2 BLINKS

1 BLINK

ON

115 V POWER REVERSED

OPEN LIMIT SWITCH

FAILURE TO CLOSEPRESSURE SWITCH

FAILED CONTROL BOARD

CLOSED LOW FIRE

IGNITION FAILURE

EQUIP. PROBLEM

PRESSURE SWITCH

GAS FLOW

GAS VALVE

VENTER

CHECK

LOW FIRE

REPLACE CONTROL

OR STACK OVERTEMP OPEN

7 BLINKS LOW FLAME SENSE FLAME SENSOR

8 BLINKS IGNITER/UNIT GROUND IGNITER/UNIT GROUND

9 BLINKS HIGH FIRE VENTER

CONTINUOUS BLINKS FALSE FLAME SENSED STICKING GAS VALVE

PRESSURE SWITCHVENT BLOCKAGEFAILURE TO CLOSE

PRESSURE SWITCH

18" X 25"

18" X 25"

INSTALLATION

18" X 25"

18" X 25"

SIDE AIR

21"

24.5" 24" X 25"

20" X 25"

SIZE

17.5"

14"

DU BATIDIMENSIONS

CHASSISAPPLICATION

16" X 25"

14" X 25"

BOTTOM



ADVERTISSEMENTDECONNECTER DU CIRCUIT D'ALIMENTATION ELECTRIQUE AVANT L'ENTRETIEN.INSPECTER LES FILTRES CHAQUE MOIS ET REMPLACER SI NECESSAIRE.TOUS LES FILTRES À AIR DOIVENT ÊTRE APPROUVÉS PAR LESULC OU LEUR EQUIVALENT. ON RECÒMMANDE D'UTILISER DES FILTRES ÀAIR PERMANTS. UTILISER LE TABLEAU SUIVANT POUR REMPLACER LES FILTRES ÀAIR.

INSTALLER/SERVICEMANTHE STATUS LIGHT ON THE FURNACE CONTROL MAYBE USED AS A GUIDE TO TROUBLESHOOTING THISAPPLIANCE. STATUS LIGHT CODES ARE AS FOLLOWS:

WARNINGDISCONNECT THE ELECTRIC

POWER BEFORE SEVICING.


GMNTEFLASH CODES

SERVICING

53

GMPEFLASH CODES

INCORRECT TWINNINGREVERSED POLARITY

MODELSIZE

FILTER

SUPPLY LEADSREVERSE TRANS.

REVERSE POWER

SECONDARY LEADS

FAILURE TO DETECT

NORMAL OPERATION

EQUIP. PROBLEM

CLOSED PRESSURE

PRESSURE SWITCHFAILURE TO CLOSE

OPEN LIMIT SWITCH

FALSE FLAME SENSED

FLAME SENSE

2 BLINKS

3 BLINKS

4 BLINKS

5 BLINKS

SWITCH

1 BLINK

STATUS LIGHTON

GAS PRESSURE

FLAME SENSOR

PRESSURE SWITCHSTUCK CLOSED

GAS VALVE

MAIN LIMIT OPENAUX. LIMIT OPENSTICKING GAS

VENT BLOCKAGEPRESSURE SWITCH

VALVE

VENTER

GAS FLOW

CHECK


DISCONNECT THE ELECTRIC POWER BEFORE SEVICING.

INSPECT FILTERS MONTHLY AND REPLACE WHEN NECESSARY.ALL AIR FILTERS MUST BE CERTIFIED BY U.L. OR EQUIVALENT.PERMANENT AIR FILTERS ARE RECOMMENDED. WHEN REPLACINGAIR FILTERS USE THE FOLLOWING CHART:

GMPE075-1.5/3GMPE100-2.5/4GMPE125-3/5

18" X 25"18" X 25"18" X 25"

RAPID CONTINUOUS

WARNING

54

SERVICING

GMPHFLASH CODES

POLARITY

FALSE FLAME SENSED

OPEN LIMIT SWITCH


CLOSED PRESSURE

EQUIP. PROBLEMNORMAL OPERATION

IGNITION FAILURE

INCORRECT PRIMARY

INCORRECT TWINNING

3 BLINKS

5 BLINKS

4 BLINKS

STATUS LIGHTON

2 BLINKS

1 BLINK

SWITCHVENTER

SECONDARY LEADSREVERSE PRIMARY

WIRES

REVERSE TRANSFORMER

STICKING GAS VALVE

PRESSURE SWITCHVENT BLOCKAGE

AUX. LIMIT OPENMAIN LIMIT OPEN

GAS FLOW

GAS VALVE

STUCK CLOSEDPRESSURE SWITCH

FLAME SENSOR

GAS PRESSURE

CHECK-

CHASSIS

18" X 25"

18" X 25"

24" X 25"

20" X 25"

24.5"

21"

SIDE AIRINSTALLATION

18" X 25"

18" X 25"

SIZE

16" X 25"

14" X 25"

17.5"

14"

BOTTOMAPPLICATION


DECONNECTER DU CIRCUIT D'ALIMENTATION ELECTRIQUE AVANT L'ENTRETIEN.INSPECTER LES FILTRES CHAQUE MOIS ET REMPLACER SI NECESSAIRE.TOUS LES FILTRES À AIR DOIVENT ÊTRE APPROUVÉS PAR LESULC OU LEUR EQUIVALENT. ON RECÒMMANDE D'UTILISER DES FILTRES ÀAIR PERMANTS. UTILISER LE TABLEAU SUIVANT POUR REMPLACER LES FILTRES ÀAIR.

DISCONNECT THE ELECTRICPOWER BEFORE SEVICING.

INSPECT FILTERS MONTHLY ANDREPLACE WHEN NECESSARY.ALL AIR FILTERS MUST BE CERTIFIED BY ULC OR EQUIVALENT. PERMANENT AIRFILTERS ARE RECOMMENDED.WHEN REPLACING AIR FILTERS,USE THE FOLLOW ING CHART:

RAPID CONTINUOUS



DIMENIONSDU BÂTI

ADVERTISSEMENT

WARNING

SERVICING

55

GSUFLASH CODES

STUCK CLOSED

FLAME SENSOR

GAS PRESSURE

MAIN LIMIT OPEN

PRESSURE SWITCH

GAS VALVE STICKING

STATUS LIGHT

5 BLINKS

4 BLINKS

3 BLINKS

2 BLINKS

1 BLINK

ON

FALSE FLAME SENSED

OPEN LIMIT SWITCH

NORMAL OPERATION

CLOSED

IGNITION FAILURE

EQUIP. PROBLEM

PRESSURE SWITCH

GAS FLOW

GAS VALVE

CHECK


LOW FIRE

---

6 BLINKS

RAPID CONTINOUS

NO LIGHT IGNITION CONTROL FAILURE CHECK FUSE & TRANSFORMERCHECK FOR 115V at Control Board

18" X 25"

18" X 25"

INSTALLATION

18" X 25"

18" X 25"

SIDE AIR

21"

24.5" 24" X 25"

20" X 25"

SIZE

17.5"

14"

DU BATIDIMENSIONS

CHASSISAPPLICATION

16" X 25"

14" X 25"

BOTTOM



ADVERTISSEMENTDECONNECTER DU CIRCUIT D'ALIMENTATION ELECTRIQUE AVANT L'ENTRETIEN.INSPECTER LES FILTRES CHAQUE MOIS ET REMPLACER SI NECESSAIRE.TOUS LES FILTRES À AIR DOIVENT ÊTRE APPROUVÉS PAR LESULC OU LEUR EQUIVALENT. ON RECÒMMANDE D'UTILISER DES FILTRES ÀAIR PERMANTS. UTILISER LE TABLEAU SUIVANT POUR REMPLACER LES FILTRES ÀAIR.


WARNINGDISCONNECT THE ELECTRIC

POWER BEFORE SEVICING.



VENTER MOTOR

PRESSURE PORT TAP STOPPED UP


HIGH FIRE


VENTER MOTOR

PRESSURE PORT TAP STOPPED UP

SWAP L1 & L2 LEADS SWAP SEC. TRANSFORMER LEADS CHECK POLARITY

INCORRECT TWINNING

56

SERVICINGS-14 CHECKING FLAME SENSORA flame sensing device is used in conjunction with the igni-tion control module to prove combustion. If proof of flame isnot present the control will de-energize the gas valve and"retry" for ignition or lockout.The following drawing illustrated from a bottom view, theapproximate distances for the ignitor and flame sensor tothe gas inshot burner. This may vary on different models.You will note they are in the main burner stream.

1/4± .1/16

3/8" ± .1/16"

IGNITOR FLAME SENSOR

Models with Integrated IgnitionControl & Flame Sensor Probe

1. Disconnect the flame sensor wire from the sensor ter-minal.

2. Connect a micro-amp meter in series with this wire andthe sensor terminal. See next illustration.

3. Be sure the negative side of the meter is connected tothe wire and the positive side of the meter is to sensorterminal.

2.0Digital Meter

DC

FLAME SENSOR

WIRE FROM CONTROL BOARD

4. Place the unit into a heating cycle.5. As soon as flame is established a micro-amp reading

should be evident once proof of flame (micro-amp read-ing) is established, the hot surface ignitor will be de-energized.

6. The Integrated Ignition controls will have 1 to 4 micro-amps. If the micro-amp reading is less .8uA (micro-ampDC). Check for high resistance wiring connections, sen-sor to burner gap, dirty flame sensor, or poor grounding.

7. Clean flame sensor with steel wool or emery cloth be-fore replacing any components. DO NOT use sandpa-per. See note below.

NOTE: Contaminated fuel or combustion air can create anearly invisible coating on the flame sensor. This coatingworks as an insulator causing a loss in the flame sensesignal. If this situation occurs the flame sensor must becleaned with steel wool or emery cloth.

SERVICING

57

S-15 CHECKING MAIN BURNERSThe main burners are used to provide complete combustionof various fuels in a limited space, and transfer this heat ofthe burning process to the heat exchanger.Proper ignition, combustion, and extinction are primarily dueto burner design, orifice sizing, gas pressure, primary andsecondary air, vent and proper seating of burners.We have used several in shot burner designs over the yearsand illustrated in the following illustrations.

.023" - .027"

(Beckett Burner - New Style)

In checking main burners, look for signs of rust, oversizedand undersized carry over ports restricted with foreign ma-terial, etc, refer to previous drawing.Other older main burners (shown below) should not needadjustment in most instances. However, burner air shuttersare provided should adjustment be necessary. After thefurnace has been in operation for at least five (5) minutesloosen the air shutter locking screws and close theshutter until yellow tipped flames appear. Now slowlyopen the shutter until the yellow disappears. Retightenthe locking screw.

58

WIRING DIAGRAMS

Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.

HIGH VOLTAGE!DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THISUNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TODO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.

GMTH, GMT

NO

TE:

THE

LEA

DS

FR

OM

TH

E M

OTO

RM

AY B

E C

HAN

GED

TO

TH

ER

EQ

UIR

ED S

PEE

D.

*MED

-LO

- O

RAN

GE

*LO

W -

RED

*HI -

BLA

CK

*MED

- BL

UE

HEAT

IDBR

1

SO

G W

PS1

RLSPV

R

IDBR

1

PS2

ROS

PVR

HSIR

IDBR

2

ROS

GV

FUSE

HSI

IDBR

2 HSIR

COO

L

C

P.V

.

I.D.B

.

DS

115

/ 60

/ 1PO

WER

SUP

PLY

ROS

98

7

32

65

1 4

B

P

GV

PRO

S

BL

G

W

DS

PRO

SP

ROS

Y

PPS

2SO

PS1

Y

RLS

P

CAP

ACIT

OR

FS

BR

G

BR

HIG

H

IDB

OR

W B

W

W

W

BL LOW

MED

R

B

B

T'S

TAT

TO 1

15/1

/60 G

B

POW

ER S

UPP

LY

CO

ND

ENSI

NG

UN

IT

CH

ASSI

S G

RO

UN

DFR

OM

FU

RN

ACE

R24

V

BL R

BR

FS

LIMIT

GVPSO

PSI

LIMIT

W

WW G R

YG R

W G

TWIN

HEA

T

NEU

TRAL

S

IND

L2

FS

HSIM2

M1

COO

L

P.V

.M

OTO

R

HSI

BLPR

ITR

ANS

LS

LIM

IT S

WIT

CH

PVR

PO

WER

VE

NT

RE

LAY

PS1

PR

ES

SUR

E S

WIT

CH

, FIR

E

RO

S R

OLL

OU

T SW

ITC

HSO

ST

ACK

OV

ERTE

MP

SW

ITC

H

PV

PO

WER

VEN

TOR

PS2

PR

ES

SUR

E S

WIT

CH

, CO

MB

. BO

X

FS F

LAM

E SE

NSO

RG

V G

AS V

ALV

E

HS

IR

HO

T S

UR

FAC

E IG

NTI

ON

REL

AY

IDB

R1

IND

OO

R B

LOW

ER

HE

AT

RE

LAY

DS

DO

OR

SW

ITC

HC

OM

PON

ENT

LEG

EN

D

HS

I H

OT

SU

RFA

CE

IGN

ITO

R

IDB

IN

DO

OR

BLO

WE

R

IDB

R2

IND

OO

R B

LOW

ER

CO

OL

RE

LAY

WIR

ING

F

IELD

INST

ALLE

D P

OW

ER

F

IELD

INST

ALLE

D C

ON

TRO

L

L

INE

VO

LTAG

E

L

OW

VO

LTAG

E

W

IRE

SPLI

CE

M

AR

KED

TER

MIN

AL

U

NM

AR

KED

TER

MIN

AL

BR

BR

OW

N

PK

PIN

KPU

P

UR

PLE

R

RED

W

WH

ITE

Y

YELL

OW

G

GR

EEN

O

OR

ANG

E

WIR

E C

OD

E

B

BLAC

KBL

BL

UE

(1)

(4)

(7)

(8 (6)

(9)

(5)

(2)

(0)

(3)

NO

TES

1. R

EPLA

CE

ME

NT

WIR

E M

UST

B

E TH

E SA

ME

SIZ

E A

ND

TY

PE

OF

INSU

LATI

ON

AS

OR

IGIN

AL.(1

05ºF

).

2. W

ARN

ING

: C

ABIN

ET M

US

T BE

P

ERM

ANE

NTL

Y G

RO

UN

DED

AN

D

CO

NFO

RM

TO

N.E

.C. &

LO

CAL

CO

DE

S.

3. T

HE

LEA

DS

FRO

M T

HE

MO

TOR

MA

Y

BE

CH

AN

GED

TO

REQ

UIR

ED S

PEE

D.

B149

33-2

23

WIRING DIAGRAMSHIGH VOLTAGE!DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THISUNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TODO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.

Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.59

GMNT

LS

LIM

IT S

WIT

CH

PVR

P

OW

ER V

EN

T R

ELA

Y

PS1

PR

ESS

UR

E SW

ITC

H, F

IRE

RO

S R

OLL

OU

T SW

ITC

HSO

ST

ACK

OV

ER

TEM

P S

WIT

CH

PV

PO

WER

VEN

TOR

PS2

PR

ESS

UR

E SW

ITC

H, C

OM

B. B

OX

FS F

LAM

E SE

NSO

RG

V G

AS V

ALVE

HS

IR

HO

T S

UR

FAC

E IG

NTI

ON

REL

AY

IDBR

1 IN

DO

OR

BLO

WE

R H

EAT

REL

AY

DS

DO

OR

SW

ITC

HC

OM

PO

NEN

T LE

GE

ND

HS

I H

OT

SU

RFA

CE

IGN

ITO

R

IDB

IN

DO

OR

BLO

WE

R

IDBR

2 IN

DO

OR

BLO

WE

R C

OO

L R

ELA

Y

WIR

ING

F

IELD

INST

ALLE

D P

OW

ER

F

IELD

INST

ALLE

D C

ON

TRO

L

L

INE

VOLT

AGE

L

OW

VO

LTAG

E

W

IRE

SPL

ICE

M

AR

KE

D T

ER

MIN

AL

U

NM

AR

KE

D T

ER

MIN

AL

BR

BR

OW

N

PK

PIN

KPU

P

UR

PLE

R

RE

DW

W

HIT

EY

YE

LLO

W

G

GR

EEN

O

OR

ANG

E

WIR

E C

OD

E

B

BLAC

KBL

BL

UE

(1)

(4)

(7)

(8)

(6)

(9)

(5)

(2)

(0)

(3)

NO

TES

1. R

EPLA

CE

ME

NT

WIR

E M

UST

B

E T

HE

SA

ME

SIZ

E A

ND

TY

PE

OF

INSU

LATI

ON

AS

OR

IGIN

AL.(1

05ºF

).

2. W

ARN

ING

: C

ABIN

ET M

US

T B

E

PE

RM

AN

ENTL

Y G

RO

UN

DED

AN

D

CO

NFO

RM

TO

N.E

.C. &

LO

CA

L C

OD

ES.

3. T

HE

LEA

DS

FRO

M T

HE

MO

TOR

MA

Y

BE

CH

AN

GED

TO

REQ

UIR

ED S

PEE

D.

B149

33-2

26

HEAT

IDBR

1

SO

G W

PS

RLSPV

R

IDBR

1

ROS

ROS

PVR

HSIR

IDBR

2

ROS

GV

FUSE

HSI

IDBR

2

HSI

R

COO

L

C

P.V.

I.D.B

.

DS

115

/ 60

/ 1PO

WER

SUP

PLY

ROS

98

7

32

65

1 4

B

P

GV

PRO

S

BLHS

I

G

WP

.V.

MO

TOR

DS

PRO

SP

ROS

Y

PRO

SSO

PS

Y

RLS

P

CA

PAC

ITO

R

FS

BR

G

BR

HIG

H

IDB

OR

W B

W

W

W

BL

LOW

MED

RB

B

T'S

TAT

TO 1

15/1

/60

GB

PO

WE

R S

UP

PLY

CO

ND

EN

SIN

GU

NIT

CH

ASS

IS G

RO

UN

DFR

OM

FU

RN

AC

E

R24

V

BL RBL

BR

FS

LIMIT

GVPSO

PSI

LIMIT

W

WW G R

YG

R

W G

TWIN

HEA

T

NEU

TRA

LS

IND

L2TR

ANS

PRI

FS

HSI

M2M1

COO

L

60

WIRING DIAGRAMS



GMNT

LS

LIM

IT S

WIT

CH

PVR

P

OW

ER V

EN

T R

ELA

Y

PS1

PR

ESS

UR

E SW

ITC

H, F

IRE

RO

S

RO

LLO

UT

SWIT

CH

SO

STAC

K O

VER

TEM

P S

WIT

CH

PV

PO

WER

VEN

TOR

PS2

PR

ESS

UR

E SW

ITC

H, C

OM

B. B

OX

FS F

LAM

E SE

NSO

RG

V G

AS V

ALVE

HS

IR

HO

T S

UR

FAC

E IG

NTI

ON

REL

AY

IDBR

1 IN

DO

OR

BLO

WE

R H

EAT

REL

AY

DS

DO

OR

SW

ITC

H

CO

MPO

NE

NT

LEG

EN

D

HS

I H

OT

SU

RFA

CE

IGN

ITO

R

IDB

IN

DO

OR

BLO

WE

R

IDBR

2 IN

DO

OR

BLO

WE

R C

OO

L R

ELA

Y

WIR

ING

F

IELD

INST

ALLE

D P

OW

ER

F

IELD

INST

ALLE

D C

ON

TRO

L

L

INE

VO

LTAG

E

L

OW

VO

LTAG

E

W

IRE

SPLI

CE

M

AR

KED

TER

MIN

AL

U

NM

AR

KED

TER

MIN

AL

BR

BR

OW

N

PK

PIN

KPU

P

UR

PLE

R

RED

W

WH

ITE

Y

YELL

OW

G

GR

EEN

O

OR

ANG

E

WIR

E C

OD

E

B

BLAC

KBL

BL

UE

(1)

(4)

(7)

(8)

(6)

(9)

(5)

(2)

(0)

(3)

NO

TES

1. R

EPLA

CE

ME

NT

WIR

E M

UST

B

E TH

E SA

ME

SIZ

E A

ND

TY

PE

O

F IN

SULA

TIO

N A

S O

RIG

INAL

.(105

ºF).

2. W

ARN

ING

: C

ABIN

ET M

UST

BE

P

ERM

ANEN

TLY

GR

OU

ND

ED A

ND

C

ON

FOR

M T

O N

.E.C

. & L

OC

AL C

OD

ES.

3. T

HE

LEA

DS

FRO

M T

HE

MO

TOR

MA

Y

BE

CH

AN

GED

TO

REQ

UIR

ED S

PEE

D.

B149

33-2

27

HEA

TID

BR1

SO

G W

PS1

RLSPV

R

IDBR

1

ROS

PVR

HSIR

IDBR

2

ROS

GV

FUSE

HSI

IDBR

2

HSIR

CO

OL

C

P.V.

I.D.B

.

DS

115

/ 60

/ 1PO

WE

R SU

PPLY

RO

SAL

SRO

S

98

7

32

65

1 4

B

PG

VP

ROS

BLHS

I

G

W

DS

PRO

SP

ROS

Y

PSO

PS1

Y

RLS

P

CA

PAC

ITO

R

FS

BR

G

BR

HIG

H

IDB

OR

W B

W

W

W

BL LOW

MED

R

B

B

T'S

TAT

TO 1

15/1

/60

GB

PO

WE

R S

UP

PLY

CO

ND

EN

SIN

GU

NIT

CH

ASS

IS G

RO

UN

DFR

OM

FU

RN

AC

E

R24

V

BL RBL

BR

FS

LIMIT

GVPSO

PSI

LIMIT

W

WW G R

YG

R

W G

TWIN

HEAT

NEU

TRAL

S

IND

L2TR

ANS

PRI

FS

HSIM2

M1

COOL

ALS

PRO

S

P.V

.M

OTO

R

ALS

AU

XILI

AR

Y LI

MIT

SW

ITC

H



1. R

EPLA

CEM

ENT

WIR

E M

UST

B

E TH

E S

AME

SIZE

AN

D T

YP

E

OF

INSU

LATI

ON

AS

OR

IGIN

AL

(1

05°C

).

2. W

ARN

ING

CA

BIN

ET

MU

ST

BE

P

ER

MA

NEN

TLY

GR

OU

ND

ED

AN

D

CO

NFO

RM

TO

N.E

.C. &

LO

CA

L

CO

DES

.

3. A

LL U

NU

SED

MO

TOR

S

PEED

LEA

DS

GE

T

PLA

CE

D O

N M

1, M

2 O

R C

AP

PE

D.

NO

TE:

THE

LEA

DS

FRO

M T

HE

MO

TOR

MAY

BE

CH

ANG

ED T

O T

HE

RE

QU

IRED

SP

EED

.

NO

TES:

WIR

ING

CO

DE

FAC

TOR

Y W

IRIN

GH

IGH

VO

LTA

GE

LOW

VO

LTA

GE

B485

78-0

2*M

ED-L

O -

OR

ANG

E*L

OW

- R

ED

*HI -

BLA

CK

*MED

- BL

UE

98

7

32

65

1 4

B

P

GV

PRO

S

BL

G

W

DS

PRO

SP

ROS

Y

PPS

2SO

PS1

Y

RLS

P

CAP

ACIT

OR

FS

BR

G

BR

HIGH

IDB

OR

W B

W

W

W

BL LOW

MED

R

B

B

T'ST

AT

TO 1

15/1

/60 G

B

POW

ER S

UPP

LY

CO

ND

ENSI

NG

UN

IT

CH

ASSI

S G

RO

UN

DFR

OM

FU

RN

ACE

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V

BL R

BR

FS

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GVPSO

PSI

LIMIT

W

WW G R

YG R

W G

TWIN

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T

NEU

TRAL

S

IND

L2

FS

HSI

M2

M1

COO

L

P.V

.M

OTO

R

HSI

BLPR

ITR

ANS

HEAT

IDBR

1

SO

G W

PS1

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R

IDBR

1

PS2

ROS

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2

ROS

GV

FUSE

HSI

IDBR

2 HSIR

COO

L

P.V.

I.D.B

.

DS

115

/ 60

/ 1PO

WER

SUP

PLY

ROS

FRS

PFC

FS

HSI

DS

GV

ICB

LS

MC

P

S

TR

P

V

IDB

ID

BR

P

VRC

R

H

R

ALS

A

UX

. LIM

IT S

WIT

CH

BLW

R. D

OO

R S

WIT

CH

PO

WE

R F

AC

TOR

TR

ANS.

FLAM

E S

ENSO

RFL

AME

RO

LL-O

UT

SWIT

CH

GAS

VAL

VEH

OT

SU

RFA

CE

IGN

ITO

RIG

NIT

ION

CO

NTR

OL

BO

AR

DM

AIN

LIM

IT S

WIT

CH

MO

TOR

CO

NTR

OLL

ER

PR

ESS

UR

E SW

ITC

HTR

ANS

FOR

ME

RP

OW

ER

VEN

TER

IND

OO

R B

LOW

ER

IND

OO

R B

LWR

RE

LAY

PO

WE

R V

ENT

RE

LAY

CO

OL

REL

AY

HEA

T R

ELA

Y

WIR

E C

OD

E

B

BLAC

KBL

BL

UE

BR

BR

OW

NG

G

REE

NO

O

RAN

GE

PK

PIN

KPU

P

UR

PLE

R

RED

W

WH

ITE

Y

YELL

OW

(1)

(4)

(7)

(8 (6)

(9)

(5)

(2)

(0)

(3)

GMNT B SERIES

62

WIRING DIAGRAMS



GMNT B SERIES

LS

LIM

IT S

WIT

CH

PVR

PO

WER

VE

NT

RE

LAY

PS1

PR

ES

SUR

E S

WIT

CH

, FIR

E

RO

S R

OLL

OU

T SW

ITC

HSO

ST

ACK

OV

ERTE

MP

SW

ITC

H

PV

PO

WER

VEN

TOR

PS2

PR

ES

SUR

E S

WIT

CH

, CO

MB

. BO

X

FS F

LAM

E SE

NSO

RG

V G

AS V

ALV

E

HS

IR

HO

T S

UR

FAC

E IG

NTI

ON

REL

AY

IDB

R1

IND

OO

R B

LOW

ER

HE

AT

RE

LAY

DS

DO

OR

SW

ITC

H

CO

MPO

NEN

T LE

GE

ND

HS

I H

OT

SU

RFA

CE

IGN

ITO

R

IDB

IN

DO

OR

BLO

WE

R

IDB

R2

IND

OO

R B

LOW

ER

CO

OL

RE

LAY

WIR

ING

F

IELD

INST

ALLE

D P

OW

ER

F

IELD

INST

ALLE

D C

ON

TRO

L

L

INE

VO

LTAG

E

L

OW

VO

LTAG

E

W

IRE

SPLI

CE

M

AR

KED

TER

MIN

AL

U

NM

AR

KED

TER

MIN

AL

BR

BR

OW

N

PK

PIN

KPU

P

UR

PLE

R

RED

W

WH

ITE

Y

YELL

OW

G

GR

EEN

O

OR

ANG

E

WIR

E C

OD

E

B

BLAC

KBL

BL

UE

(1)

(4)

(7)

(8)

(6)

(9)

(5)

(2)

(0)

(3)

NO

TES

1. R

EPLA

CE

ME

NT

WIR

E M

UST

B

E TH

E SA

ME

SIZ

E A

ND

TY

PE

OF

INSU

LATI

ON

AS

OR

IGIN

AL.(1

05ºF

).

2. W

ARN

ING

: C

ABIN

ET M

US

T BE

P

ERM

ANE

NTL

Y G

RO

UN

DED

AN

D

CO

NFO

RM

TO

N.E

.C. &

LO

CAL

CO

DE

S.

3. T

HE

LEA

DS

FRO

M T

HE

MO

TOR

MA

Y

BE

CH

AN

GED

TO

REQ

UIR

ED S

PEE

D.

4. A

LL U

NU

SED

MO

TOR

LEA

DS

GET

PLA

CE

D

ON

M1

AND

M2

OR

CA

PPED

.

B149

33-2

34

ALS

AU

XILI

AR

Y L

IMIT

SW

ITC

H

HEAT

IDBR

1

SO

G W

PS1

RLSPV

R

IDBR

1

ROS

PVR

HSIR

IDBR

2

ROS

GV

FUSE

HSI

IDBR

2

HSIR

COO

L

P.V.

I.D.B

.

DS

115

/ 60

/ 1PO

WER

SUP

PLY

RO

SAL

SRO

S

45

6

89

7

23

1

RO

SG

VPHS

IBL

W

*MED

-LO

- O

RAN

GE

*LO

W -

RED

*HI -

BLA

CK

*MED

- BL

UE

ROS

ROS

PP

RO

S

PP

SOAL

SP

FS

LS

PS

B

YY

G

MO

TOR

P.V

.

R

BW

R

P

O

W

CAP

ACIT

OR

BR B

RIDB

G

*R

*BL

*O

*B

PO

WE

R S

UP

PLY

TO 1

15/1

/60

CO

ND

EN

SIN

G

BUN

IT

L2

FRO

M F

UR

NA

CE

BL

DS

G

W

BLR

B

T'S

TAT

Y

24V

R

W RGW G R

FS

W

GV

LIMIT

PSI

PSO

LIMIT

NEUT

RALS

PRI

TRA

NS

CH

ASS

IS G

RO

UN

D

G R

W

WTW

IN

FS

B

IND

HEAT

M1

M2 HSI

COO

L



GMNTE

FS F

LAM

E SE

NS

OR

GV

GA

S V

ALVE

HS

IR

HO

T S

UR

FAC

E IG

NTI

ON

REL

AY

DS

DO

OR

SW

ITC

H

CO

MPO

NEN

T LE

GE

ND

HS

I H

OT

SU

RFA

CE

IGN

ITO

R

IDB

IN

DO

OR

BLO

WE

R

LS

LIM

IT S

WIT

CH

PVR

1 P

OW

ER V

EN

T R

ELA

Y, L

OW

FIR

E

PS1

PR

ESS

UR

E S

WIT

CH

, LO

W F

IRE

RO

S R

OLL

OU

T SW

ITC

HSO

ST

AC

K O

VER

TEM

P S

WIT

CH

PV

PO

WER

VEN

TOR

PS2

PR

ESS

UR

E S

WIT

CH

, HIG

H F

IRE

PFC

PO

WER

FA

CTO

R C

HO

KE

WIR

ING

F

IELD

INST

ALLE

D P

OW

ER

F

IELD

INST

ALLE

D C

ON

TRO

L

L

INE

VOLT

AGE

L

OW

VO

LTAG

E

W

IRE

SPLI

CE

M

AR

KED

TER

MIN

AL

U

NM

AR

KED

TE

RM

INA

L

BR

BR

OW

N

PK

PIN

KPU

P

UR

PLE

R

RE

DW

W

HIT

EY

Y

ELLO

W

G

GR

EEN

O

OR

AN

GE

WIR

E C

OD

E

B

BLA

CK

BL

BLU

E(1

)(4

)(7

)(8

)(6

)(9

)(5

)(2

)(0

)(3

)

NO

TES

1. R

EPLA

CE

ME

NT

WIR

E M

UST

B

E TH

E SA

ME

SIZ

E A

ND

TY

PE

OF

INSU

LATI

ON

AS

OR

IGIN

AL.(

105º

F).

2. W

AR

NIN

G:

CA

BIN

ET M

UST

BE

P

ERM

ANEN

TLY

GR

OU

ND

ED A

ND

C

ON

FOR

M T

O N

.E.C

. & L

OC

AL C

OD

ES.

3. P

OW

ER F

ACTO

RY

CH

OKE

PR

ESE

NT

O

NLY

ON

UN

ITS

WIT

H 3

/4 A

ND

1

HP

IND

OO

R B

LOW

ERS

.

B149

33-2

35

ALS

AU

XILI

AR

Y LI

MIT

SW

ITC

H

*MED

-LO

- O

RAN

GE

*LO

W -

RE

D

*HI -

BLA

CK

*MED

- B

LUE

GYLO YW2

W1R

FAN

LOW

HE

AT

LOW

CO

OL

HIG

H CO

OL

IDB

PS2HI

GH

SOLS

ROR

ORO

FUSE

HSI

R

FS

HIG

H HE

AT

PS1

RO

HSIR

HIG

H

PVR

2

GV

ALS

LOW

PVR1

C

HSI

PVR1

DS

LOW

MO

DEL

SPF

CNO

T AL

L

PVR2

POW

ER S

UPPL

Y11

5 / 6

0 / 1

PV

IDB

XFM

R

EAC

BL

24V

B W

FSALS

R

R

P

BR

R

PS

G

P

YY

LINE

XFMR

EAC

CIRC

HUM

HUM

XFMR

LINE

NOT

ALL

MO

DELS

TO 1

15/1

/60

POW

ER S

UPPL

Y

BG

W

PFC

HSI

W

HO

TN

EUTR

ALS

B

WB

W

R

B

G

HI

LOW

COM

BLP

GV

P

PP

LS

SO

BLO

PS

P

O

RO

S

RO

SP

RO

SRO

SP

P

W

IDB

PV

DS

XFM

R T

RA

NSF

OR

ME

R

PVR

2 P

OW

ER V

EN

T R

ELA

Y, H

IGH

FIR

E

64

WIRING DIAGRAMS



GMPN

*

12

3

45

6

78

9

*

1. R

EPLA

CEM

EN

T W

IRE

MU

ST

BE

TH

E S

AM

E SI

ZE A

ND

TY

PE

O

F IN

SU

LATI

ON

AS

OR

IGIN

AL

(1

05°C

).

2. W

ARN

ING

CAB

INET

MU

ST B

E

PER

MAN

EN

TLY

GR

OU

ND

ED A

ND

C

ON

FOR

M T

O N

.E.C

. & L

OC

AL

C

OD

ES.

THE

LEA

DS

FR

OM

TH

E M

OTO

RM

AY B

E C

HAN

GE

D T

O T

HE

RE

QU

IRE

D S

PEE

D.

* M

ED H

I - Y

ELLO

WM

ED L

OW -

ORA

NG

E

POW

ER

SU

PPL

YTO

115

/1/6

024

V

B

BP

.V.

MO

TOR G

W

G

BRBR

WIR

E C

OLO

R C

OD

E

B BL BR G OO

RAN

GE

GR

EEN

BR

OW

N

BLU

EB

LAC

KP

INK

PU

RP

LEW

HIT

EY

ELLO

WR

EDRYWPK

NO

TE:

P.V

.

I.D.B

.

NO

TES:

WIR

ING

CO

DE

FAC

TOR

Y W

IRIN

GH

IGH

VO

LTAG

ELO

W V

OLT

AGE

B

MED

R

HIG

H

B

LOW

BL

BL

115

/ 60

/ 1

HEAT

COO

L

LSR G W

PS

IDB

- IN

DOO

R BL

OW

ER

LS -

LIM

IT S

WIT

CH

DS -

DO

OR

SWIT

CH

PVR

- POW

ER V

ENT

RELA

YRO

S - R

OLLO

UT S

WIT

CH

GV

- GA

S VA

LVE

HSI -

HO

T SU

RFA

CE

IGNI

TOR

IDBR

2

IDBR

- IN

DOO

R BL

OW

ER R

ELAY

PV -

POW

ER V

ENTO

R

FS -

FLAM

E SE

NSO

R

PS

LS

DS

IDB

GV

FS

HSI

SO

W

COO

L

HEA

T

M1

M2

HSI

IND

NEU

TRAL

SPR

ITR

ANS

W G R

L2

W

W

R

LIMIT

PSI

PSO

GVFS

LIMIT

Y

R

R

Y

CAP

AC

ITO

R

P

BL

PVR

ROS

GV

IDBR

1

IDBR

2PV

R

HSIR

HOT

SUR

FAC

E IG

NITI

ON

REL

AY

HSI

FUSE

W G R

ROS

B

W

R

O

B

P

FS

TWIN

ROS

P

BL

PS -

PRE

SSUR

E SW

ITCH

SO -

STAC

K OV

ERTE

MP

SWIT

CH

W RGY

CO

ND

EN

SIN

GU

NIT

SO

T'S

TAT

W

R

G

HSIR

HSIR

POW

ER S

UPPL

Y

ROS

ROS

ROS

PP

P

IDBR

1

BL

ROS

P

ROS

FRO

M F

UR

NAC

EC

HAS

SIS

GR

OU

ND

(1)

(4)

(7)

(8)

(6)

(0)

(2)

(3)

(5)

(9)

B285

7804



GMPE

12

3

45

6

78

9

POW

ER S

UPP

LY11

5/1/

60

{1.

RE

PLA

CE

ME

NT

WIR

E M

US

T

BE

TH

E S

AME

SIZ

E A

ND

TY

PE

O

F IN

SU

LATI

ON

AS

OR

IGIN

AL

(1

05°C

).

2. W

ARN

ING

CA

BIN

ET M

UST

BE

P

ER

MA

NE

NTL

Y G

RO

UN

DED

AN

D

CO

NFO

RM

TO

N.E

.C. &

LO

CAL

C

OD

ES

.

3. P

FC U

SED

ON

G

MP

E10

0 &

125

MO

DE

LS

ON

LY.

TO T

HER

MO

STAT

WH

ITE=

W1

BROW

N=W

2G

REEN

=GR

ED=R

YELL

OW

=Y

B25

5780

6

24V

P.V

.

WIR

E C

OLO

R C

OD

E

B BL

BR

G OO

RA

NG

EG

RE

EN

BR

OW

NB

LUE

BLA

CK

PIN

KP

UR

PLE

WH

ITE

YEL

LOW

RED

RYWPK

P.V

.

I.D.B

.

NO

TES

:W

IRIN

G C

OD

E

FAC

TOR

Y W

IRIN

GH

IGH

VO

LTA

GE

LOW

VO

LTA

GE

HIG

H V

OLT

AG

EFI

ELD

WIR

ING

B

L 1

L 2

LS

R G W1

PS

AL

IDB

- IN

DO

OR

BLO

WER

LS -

LIM

IT S

WIT

CH

HR

- HE

AT R

ELAY

PVR

- PO

WER

VEN

T RE

LAY

RO

S - R

OLL

OU

T SW

ITC

H

GV

- G

AS V

ALVE

HSI

- HO

T SU

RFA

CE

IGNI

TOR

IDBR

IDBR

- IN

DOO

R B

LOW

ER R

ELA

Y

PV -

POW

ER V

ENTO

R

FS -

FLAM

E SE

NSO

R

PS

LS

DS

IDB

LO

FS

HSI

ROS

CO

OL

HEA

T

M1

M2

HSI

IND

NEU

TRAL

S

W G R

L2

WR

ROS

ROS

R

P

PBL

PVR

ROS

RO

S

GV

PVR

ICB

- IN

TER

GR

ATED

CIR

CUIT

BO

ARD

HSI

FUSE

ALS

ROS

ROS

P

P

FS

TWIN

ROS

PS -

PR

ESSU

RE S

WIT

CH

CR

- CO

OL R

ELAY

OTC

OT1

OT2

OHUM

C1 C2W

1/W

2W

2E R Y1

Y/Y2 G

BL

J3J2

BLY

GY

RW

R

G

W

R

YY

P

P

O

B

W

W

B

B

W

W

B

W

BL

P

B

BL

ICB

MC

- M

OTO

R C

ONT

ROLL

ERTR

- TR

ANSF

OR

MER

ALS

- AU

XILI

ARY

LIM

IT S

WIT

CH

DS

- DO

OR

SW

ITC

H

MC

G

BL

O

31

2

4

COM

HI

GV

BR

BL

W

BR

BR

W2

B

BR

B

115V

PFC

IDBR

IDBR

PFC

DS

HEA

T

CO

OL

PFC

- PO

WER

-FAC

TOR

CH

OKE

TRA

NSF

OR

MER

W2R

HSI

R

HSI

R - H

OT

SURF

ACE

IGN

ITO

R R

ELAY

W2R

- W

2 R

ELAY

W2

REL

AY

SEE

NO

TE#3

W2R

6

27

TO CO

NDE

NSI

NG

UN

IT

66

WIRING DIAGRAMS



GMPE

FS F

LAM

E SE

NSO

R

GV

GAS

VAL

VE

DS

DO

OR

SW

ITC

H

CO

MPO

NEN

T LE

GE

ND

HS

I H

OT

SU

RFA

CE

IGN

ITO

RIC

B

IGN

ITIO

N C

ON

TRO

L BO

AR

DLS

LI

MIT

SW

ITC

H

IDB

IN

DO

OR

BLO

WE

R

PS

PR

ESSU

RE

SW

ITC

H

PVR

PO

WER

VE

NT

RE

LAY

CR

C

OO

L R

ELA

Y

PV

PO

WER

VEN

TOR

TR

TRAN

SFO

RM

ER

WIR

ING

F

IELD

INST

ALLE

D P

OW

ER

F

IELD

INST

ALLE

D C

ON

TRO

L

L

INE

VO

LTAG

E

L

OW

VO

LTAG

E

W

IRE

SPLI

CE

M

AR

KED

TER

MIN

AL

U

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72

WIRING DIAGRAMS



GMT, GMTH

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GA

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ITO

RH

SIR

H

OT

SU

RFA

CE

IGN

ITO

R R

ELA

Y

LS

LIM

IT S

WIT

CH

IDB

IN

DO

OR

BLO

WE

R

PS

P

RE

SSU

RE

SWIT

CH

PV

R

POW

ER V

EN

T R

ELA

YR

OS

RO

LLO

UT

SWIT

CH

PV

P

OW

ER

VEN

TOR

WIR

ING

F

IELD

INST

ALL

ED

PO

WE

R

FIE

LD IN

STA

LLE

D C

ON

TRO

L

L

INE

VO

LTAG

E

L

OW

VO

LTA

GE

W

IRE

SPL

ICE

M

AR

KE

D T

ERM

INA

L

UN

MA

RKE

D T

ERM

INA

L

BR

BR

OW

N

PK

PIN

KPU

P

UR

PLE

R

RE

DW

W

HIT

EY

Y

ELLO

W

G

GR

EEN

O

OR

ANG

E

WIR

E C

OD

E

B

BLA

CK

BL

BLU

E

NO

TES

1. R

EPL

AC

EM

EN

T W

IRE

MU

ST

BE

TH

E SA

ME

SIZ

E A

ND

TY

PE

OF

INSU

LATI

ON

AS

OR

IGIN

AL.

(105

ºF).

2. W

ARN

ING

: C

AB

INET

MU

ST B

E

PE

RM

ANE

NTL

Y G

RO

UN

DED

AN

D

CO

NFO

RM

TO

N.E

.C. &

LO

CAL

CO

DE

S.

B149

33-1

97

IDBR

IN

DO

OR

BLO

WE

R R

ELA

Y

WGRFU

SE

ROS

PSLS

PVR

ROS

IDBR

1

IDBR

2

HSIR

GV

C

I.D.B

.ID

BR2

PVR

IDBR

1

COO

L

HSIR

HSI

HEAT

115

/ 60

/ 1

POW

ER S

UPPL

Y

P.V

.

*

*

98

65

74

32

1

BLW

O

GV

PRO

S

ROS

P

W B

HSI

PS

B

W

G

MO

TO

RP.

V.

Y Y

LSR

P

R

W

FS

CA

PAC

ITO

R

BRBR

IDB

G

HIG

H

R

MED

LOWBL

B

TRAN

S

BL

DS

BG

BL

TO 1

15/1

/60

POW

ER

SU

PPLY

OP

TIO

NAL

CO

ND

ENS

ING

UN

ITT'

STAT

B

24V

Y

YW RG

B

W

YR

Y

RBL

FS

LIMIT

PSI

LIMIT

FS

GV

PSO

NEU

TRAL

SPR

I

TWIN

FUR

NAC

E C

HAS

SIS

GN

D.

R

G RW

BL

R

W G

B

IND

L2

HEA

T

M2M1

HSI

COO

L



12

3

45

6

78

9

THE

LEA

DS

FR

OM

TH

E M

OTO

RM

AY B

E C

HAN

GE

D T

O T

HE

RE

QU

IRE

D S

PEE

D.

1. R

EPLA

CEM

EN

T W

IRE

MU

STBE

TH

E SA

ME

SIZE

AN

D T

YPE

OF

INS

ULA

TIO

N A

S O

RIG

INAL

(105

°C).

2. W

ARN

ING

CAB

INET

MU

ST B

EPE

RM

ANE

NTL

Y G

RO

UN

DED

AN

DC

ON

FOR

M T

O N

.E.C

. & L

OC

ALC

OD

ES.

POW

ER

SU

PPL

YTO

115

/1/6

024

V

B

BP

.V.

MO

TOR

BRBR

WIR

E C

OLO

R C

OD

E

B BL G OO

RAN

GE

(6)

GR

EEN

(8)

BLU

E (4

)B

LAC

K (1

)P

UR

PLE

(5)

WH

ITE

(0)

YEL

LOW

(3)

RED

(2)

RYWN

OTE

:

P.V

.

I.D.B

.

NO

TES:

WIR

ING

CO

DE

FAC

TOR

Y W

IRIN

GH

IGH

VO

LTAG

ELO

W V

OLT

AGE

BBL

HEAT

COO

L

LSR G W

PS

ALS

IDB

- IN

DOO

R BL

OW

ER

LS -

LIM

IT S

WIT

CH

DS -

DO

OR

SWIT

CH

PVR

- POW

ER V

ENT

RELA

Y

ROS

- ROL

LOUT

SW

ITC

H

GV

- GA

S VA

LVE

HSI -

HO

T SU

RFA

CE

IGNI

TOR

IDBR

2

IDBR

- IN

DOO

R BL

OW

ER R

ELAY

PV -

POW

ER V

ENTE

R

FS -

FLAM

E SE

NSO

R

PS

LS

DS

IDB

GV

FS

HSI

ROS

W

MED

LO

- O

RAN

GE

COOL

HEAT

M1

M2

HSI

IND

NEU

TRAL

SPR

ITR

ANS

W G R

L2

W

WR

YY

CAP

AC

ITO

R

P

BL

PVR

ROS

GV

IDBR

1

IDBR

2

PVR

HSI

FUSE

W G R

BL

B

W

RR

O

FS

TWIN

P

PS -

PRE

SSUR

E SW

ITCH

ALS

- AU

XILI

ARY

LIM

IT S

WIT

CH

W RGY

Y

UN

ITT'

STA

T

W

G

HSIR HS

IR

FUR

NAC

E C

HAS

SIS

GN

D.

IDBR

1

POW

ER S

UPPL

Y

115

/ 60

/ 1O

PTIO

NA

L C

ON

DEN

SIN

G

MED

-

BLUE

LO -

RED

MED

HI

- Y

ELLO

WHI

-

BLA

CK

ALS

FS

G

B255

78-0

4

(3)

(4)

(5)

(6)

(7)

(8) (9)

(1)

(2)

GPD, GDT, GDT A & B SERIES

74

WIRING DIAGRAMS



GSM

*

1. R

EPLA

CEM

EN

T W

IRE

MU

ST

BE T

HE

SAM

E S

IZE

AN

D T

YPE

OF

INSU

LATI

ON

AS

OR

IGIN

AL

(105

°C).

2. W

AR

NIN

G C

ABIN

ET

MU

ST B

EPE

RM

AN

ENT

LY G

RO

UN

DED

TO

CO

NFO

RM

TO

N.E

.C. &

LO

CA

LC

OD

ES.

OV

ER

CU

RR

EN

TP

RO

TEC

TIO

ND

EV

ICE

PO

WE

R S

UP

PLY

TO 1

15/1

/60

24V

B

P.V

.M

OTO

R G

G

BR B

R

WIR

E C

OLO

R C

OD

E

B BL BR G OO

RA

NG

EG

RE

ENBR

OW

NBL

UE

BLA

CK

PUR

PLE

WH

ITE

YELL

OW

RED

RYW

I.D.B

.

NO

TES

:W

IRIN

G C

OD

E

HIG

H V

OLT

AG

E

LOW

VO

LTA

GE

B

MED

BL

HIG

H

B

LOW

R

BL

L1L2

HEA

T - F

IRST

STA

GE

CO

OL

LSR G W

1

PS1

IDB

- IND

OO

R B

LOW

ER

LS -

LIM

IT S

WIT

CH

DS

- DO

OR

SW

ITCH

PVR

- PO

WER

VEN

T RE

LAY

RO

S - R

OLL

OU

T SW

ITCH

GV

- G

AS V

ALVE

HSI

- HO

T SU

RFA

CE IG

NIT

OR

IDBR

(ON

IGM

)

IDBR

- IN

DO

OR

BLO

WER

REL

AY

PV -

POW

ER V

ENTE

R

FS -

FLAM

E SE

NSO

R

PS1

LS

DS

IDB

HSI

SO

W

COO

L

HT. M

ED

HT. L

O

HSI

IND

LO

NEUT

RALS

PRI

TRAN

S

G R

L2

W

W

R

Y

P

R

R

Y

THER

MO

STAT

CA

PA

CIT

OR

P

SO

IGM

IGM

IGM

- IG

NIT

ION

MO

DUL

E

HSI

FUSE

BR G R

BLFU

RNAC

E C

HAS

SIS

GRO

UND

.

B

W

BL

B

YY

RR

PP

(ON

IGM

)

PVR

(ON

IGM

)

SO -

STAC

K O

VERT

EMP

PS3

- PRE

SSU

RE S

WIT

CH

CO

MB.

BO

X

C

DS

BL

PCB

- PR

INTE

D C

IRCU

IT B

OAR

D

GV

RO

SP

RO

SPS

3

PS3

FS

RO

O

P

PS2

BL

BL

R

O

O

B

IND

HI

R

B

W

W1

W

PS1

- PRE

SSU

RE S

WIT

CH

LO F

IRE

PS2

- PRE

SSU

RE S

WIT

CH

HI F

IRE

IGM

IGM

LO S

PD.

HI S

PD

PV

IGM

HEA

T - S

ECO

ND

STA

GE

W2

PVR

(ON

IGM

)

GV

PS2

LO CO

M

HI

W2

PKPI

NK

G

Y

Y

CO

NDE

NSI

NG

UNI

T

W1

W2 G R

RO

S

RO

S

B285

78-0

9

115V

24V

22 23 24 25

17

31

129

6

85

2

47

10

3

11

1



*

12

3

45

6

78

9

*

THE

LEA

DS

FRO

M T

HE

MO

TOR

MAY

BE

CH

ANG

ED T

O T

HE

RE

QU

IRED

SP

EED

.

1. R

EPL

ACEM

ENT

WIR

E M

UST

BE T

HE

SAM

E S

IZE

AND

TYP

EO

F IN

SULA

TIO

N A

S O

RIG

INAL

(105

°C).

2. W

ARN

ING

CA

BIN

ET M

UST

BE

PER

MAN

EN

TLY

GR

OU

ND

ED A

ND

CO

NFO

RM

TO

N.E

.C. &

LO

CA

LC

OD

ES.

POW

ER

SUP

PLY

TO 1

15/1

/60

24V

B

BP.

V.

MO

TOR G

W

G

BRBR

WIR

E C

OLO

R C

OD

E

B BL BR G OO

RA

NG

EG

REE

NB

RO

WN

BLU

EBL

ACK

PIN

KPU

RPL

EW

HIT

EYE

LLO

WR

EDRYWP

K

NO

TE:

P.V.

I.D.B

.

NO

TES:

WIR

ING

CO

DE

FAC

TOR

Y W

IRIN

GH

IGH

VO

LTA

GE

LOW

VO

LTAG

E

B

MED

R

HIG

H

B

LOWBL

BL

115

/ 60

/ 1

HEAT

COO

L

LSC

R G W

PS1

IDB

- IND

OOR

BLO

WER

LS -

LIM

IT S

WIT

CH

DS -

DO

OR

SWIT

CH

PVR

- POW

ER V

ENT

RELA

YRO

S - R

OLLO

UT S

WIT

CH

GV

- GA

S VA

LVE

HSI -

HO

T SU

RFAC

E IG

NITO

R

IDBR

2

IDBR

1 - I

NDOO

R BL

OW

ER H

EAT

RELA

Y

PV -

POW

ER V

ENTO

R

FS -

FLAM

E SE

NSO

R

PS1

LS

DS

IDB

GV

FS

HSI

SO

W

* M

ED H

I - Y

ELLO

W

MED

LOW

- O

RANG

E

COOL

HEAT

M1

M2

HSI

IND

NEU

TRAL

SPR

ITR

ANS

W G R

L2

W

W

R

LIMIT

PSI

PSO

GVFS

LIMIT

Y

R

R

Y

CAP

AC

ITO

R

P

PVR

ROS

GV

IDBR

1

IDBR

2PV

R

HSIR

HOT

SU

RFAC

E IG

NITI

ON

RELA

Y

HSI

FUSE

W G R

B

W

R

O

B

P

FS

TWIN

P

BL

PS1

- PR

ESSU

RE S

WIT

CH, F

IRE

SO -

STAC

K OV

ERTE

MP

SWIT

CH

W RGY

CO

ND

ENS

ING

UN

IT

SO

T'S

TAT

W

G

HSIR

HSIR

POW

ER S

UPPL

Y

P

IDBR

1

BL

ROS

P

FRO

M F

UR

NAC

EC

HAS

SIS

GR

OU

ND

(1)

(4)

(7)

(8)

(6)

(0)

(2)

(3)

(5)

(9)

PS2

- PR

ESSU

RE S

WIT

CH, C

OM

B. B

OX

IDBR

2 - I

NDOO

R BL

OW

ER C

OOL

REL

AY

PS2

PS2

DS

ROS

P

ROS

B28

578-

08

GSMS

76

TWINNING DIAGRAMSHIGH VOLTAGE!DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THISUNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TODO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.


GSU & GSMTW

INN

ING

DIA

GR

AM

GSU

& G

SMS

TWO

-STA

GE

THER

MO

STAT

NO

TE 1

: MU

ST U

SE O

NE

SOU

RC

E O

F PO

WER

FO

R B

OTH

FU

RN

AC

ES.

ISO

LATI

ON

RE

LAY

ISO

LATI

ON

RE

LAY

RO

OM

TH

ER

MO

STAT

FUR

NA

CE

2FU

RN

AC

E 1

3A ATO

3A ATO

NEUT

RALS

TRNS

SEC

24VA

CCO

M

L1MI

PSO

PSI

L1MO

FS

GV

F1

PSI2

N/U

N/U

N/U

GND

PSO2

GVHI

STAT

US

HI

PRI

TRNS

L2

INDU

CER

LOHSI

MED LOHI

BLOW

ER

M1

24VA

CCO

M

SEC

TRNS

GV

L1MO

L1MI

PSI

PSO

N/U

FS

N/U

N/U

GND

GVHI

PSI2

PSO2

NEUT

RALS

TRNS

PRI

L2

F1

STAT

US

INDU

CER

LOHIHSI

LOMED

BLOW

ERHIM1

W1

W2 G R

TWIN

G RW1

W2

TWIN

W1

W2

RG

Y

BLU

EB

LUE

WH

ITE

BR

OW

NG

REE

NR

ED

CO

ND

EN

SE

RB

LUE

77

TWINNING DIAGRAMS



NO

TE 1

:M

UST

USE

ON

E SO

UR

CE

OF

POW

ER F

OR

BO

TH F

UR

NA

CES

.2

:C

AN

NO

T B

E U

SED

WIT

H T

WO

-STA

GE

FUR

NA

CE

APP

LIC

ATIO

NS.

TWIN

NIN

G D

IAG

RA

MG

MP,

GM

PX,

GM

PN,

GM

T, G

MN

T &

GSM

SSI

NG

LE-S

TAG

E TH

ERM

OST

AT

GMP, GMPX, GMPN, GMT, GMNT, GSMS

YW

GR

RO

OM

TH

ERM

OST

AT

WH

ITE

GR

EEN

RED

ISO

LATI

ON

REL

AY

TWIN

NIN

G W

IRE

TRNS

12

3

ATO

3A

LIMI

LIMO

GV

PSI

PSO

FS

150

1

89

56

N/U

90+I

90+O

NEUT

RALS

74

PRI

90 120

BLK

1012

-83-

9332

x H

SCI

B180

99-1

310

12-9

33C

STAT

US

K4

F1FS

K3

P1

K1

P3RGW

AN1

HUM

P2

K2

L2IND

HUM

115VHS

I

M1

M2

TWIN

K5

COOL

HEAT

EAC

FUR

NA

CE

1

TRNS

12

3

ATO

3A

LIMI

LIMO

GV

PSI

PSO

FS

150

1

89

56

N/U

90+I

90+O

NEUT

RALS

74

PRI

90 120

BLK

1012

-83-

9332

x H

SCI

B180

99-1

310

12-9

33C

STAT

US

K4

F1FS

K3

P1

K1

P3RGW

AN1

HUM

P2

K2

L2IND

HUM

115VHS

I

M1

M2

TWIN

K5

COOL

HEAT

EAC

FUR

NA

CE

2

WH

ITE

RED

BLU

E

CO

ND

ENSE

R 1

CO

NTA

CTO

RC

OIL

CO

ND

ENSE

R 2

CO

NTA

CTO

RC

OIL

TO C

OO

LIN

G C

ON

TAC

TOR

BLUE

WHITE

service instructions aluminized steel heat exchanger, aluminized inshot burners, lonox, gas and...

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