carrier twinning instructions

1

KGATW0601HSI

Installation Instructions

TWINNING KIT FOR HSI SINGLE--- AND2---STAGE CONDENSING AND

NON---CONDENSING GAS FURNACES

Please read these instructions completely before starting theinstallation.

TABLE OF CONTENTS

TABLE OF CONTENTS 1

SAFETY CONSIDERATIONS 1. . . . . . . . . . . . . . . . . . . . . . . .

INTRODUCTION 2

DESCRIPTION AND USAGE 2

ELECTROSTATIC DISCHARGE (ESD) PRECAUTION 4. . .

SECTION I: MULTIPOISE SINGLE--SPEED AND TWO--SPEED NON--CONDENSING HSI FURNACEMODELS 5

INSTALL FURNACES 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CONNECT ELECTRICAL COMPONENTS— HEATING 10

CONNECT ELECTRICAL COMPONENTS--COOLING 15

VENTING 15. . . . . .

GAS SUPPLY PIPING 15

ELECTRICAL SUPPLY CONNECTIONS 15. . . . . . . . . . . . .

START--UP AND ADJUSTMENT 18

SEQUENCE OF OPERATION 20

SECTION II: SINGLE--SPEED AND TWO--SPEEDMULTIPOISE CONDENSING HSI FURNACEMODELS 21

INSTALL FURNACES 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CONNECT ELECTRICAL COMPONENTS — HEATING 28

CONNECT ELECTRICAL COMPONENTS— COOLING 31

VENTING 32

GAS SUPPLY PIPING 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CONDENSATE DRAIN CONNECTIONS 32

ELECTRICAL SUPPLY CONNECTIONS 32. . . . . . . . . . . . .

START--UP AND ADJUSTMENT 32. . . . . . . . . . . . . . . . . . . .

SEQUENCE OF OPERATION 33

SAFETY CONSIDERATIONSInstalling and servicing heating equipment can be hazardous due togas and electrical components. Only trained and qualifiedpersonnel should install, repair, or service heating equipment.Untrained personnel can perform basic maintenance functions suchas cleaning and replacing air filters. All other operations must beperformed by trained service personnel. When working on heatingequipment, observe precautions in literature, on tags, and on labelsattached to or shipped with unit and other safety precautions thatmay apply.

These instructions cover the minimum requirements and conformto existing national standards and safety codes. In some instances,these instructions exceed certain local codes and ordinances,especially those that may not have kept up with changingresidential construction practices. We require these instructions as aminimum for a safe installation.

Wear safety glasses and work gloves. Have a fire extinguisheravailable during start--up and adjustment procedures and servicecalls.

Recognize safety information. This is the safety--alert symbol .When you see this symbol on the furnace and in instructions ormanuals, be alert to the potential for personal injury.

Understand the signal words DANGER, WARNING, andCAUTION. These words are used with the safety--alert symbol.DANGER identifies the most serious hazards which will result insevere personal injury or death. WARNING signifies a hazardwhich could result in personal injury or death. CAUTION is usedto identify unsafe practices which may result in minor personalinjury or product and property damage. NOTE is used to highlightsuggestions which will result in enhanced installation, reliability, oroperation.

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal injuryor death.

Turn off gas and electrical supplies to unit before beginningany installation or modification. Follow operating instructionson label attached to furnace.

! WARNING

2

CUT HAZARD

Failure to follow this caution may result in personal injury.

Sheet metal parts may have sharp edges or burrs. Use careand wear appropriate protective clothing and gloves whenhandling parts.

CAUTION!

INTRODUCTIONIMPORTANT: Only the furnace sizes listed in Tables 2, 3 and 4can be twinned. Both furnaces must have the same productnumber, including heating and cooling sizes, to achieve correctoperation.

This furnace twinning kit P/N KGATW0601HSI permitsconnection to the following furnaces to operate as a single unit onthe same duct work:S 2 multipoise, 33.3 inch (846 mm), single--speed,

non--condensing furnaces (See Fig. 1, 2, and Table 2.)

S 2 multipoise, 33.3 inch (846 mm), 2--stage, non--condensing

furnaces (See Fig. 1, 14, and Table 2.)

S 2 upflow, 40 inch (1016 mm), single--speed, condensing

furnaces (See Fig. 22, 23, and Table 3 or 4.)

S 2 upflow, 40 inch (1016 mm), 2--stage, condensing furnaces

(See Fig. 22, 23, and Table 3 or 4.)

UNIT AND PROPERTY DAMAGE HAZARD

Failure to follow this warning could result in unit and propertydamage.

A non--condensing furnace shall NOT be twinned with acondensing furnace. Two--stage condensing ornon--condensing furnaces shall not be twinned with any singlestage furnace. Do not twin furnaces that have a differentnumber of blower motor speed taps together. Furnaces shallonly be twinned in the positions shown. Variable--speedfurnaces shall not be twinned.

! WARNING

DESCRIPTION AND USAGERefer to the appropriate section for your furnaces.

SECTION I: Models 58STA, 58STX, 58DLA, 58DLX, 310AAV,310JAV, 311AAV, 311JAV, PG8MAA, and PG8JAA MultipoiseSingle--Speed Non--Condensing HSI FurnacesS Single--Stage Heat with Single--Stage Gas--Heat Thermostat

S Two--Stage Heat with 2--Stage Gas--Heat Thermostat

S Models 58CTA, 58CTX, 312AAV, and 312JAV, Multipoise

2--Stage Non--Condensing HSI Furnaces

S Two--Stage Heat with Single--Stage Gas--Heat Thermostat


SECTION II: Models 58MCA, 58MCB, 58MSA, 58MXA,58MXB, 340AAV, 340MAV, 345MAV, 350AAV, 350MAV,490AAV, PG9MAA and PG9MAB Upflow Single--SpeedCondensing HSI FurnacesS Single--Stage Heat with Single--Stage Gas--Heat Thermostat

SECTION III: Models 58MTA, 58MTB, 352MAV and 352AAVUpflow 2--Stage Condensing HSI Furnaces

S Two--Stage Heat with Single--Stage Gas--Heat Thermostat


DUCT CONNECTIONSAll furnaces must have a common supply plenum attached to thefurnaces or evaporator coils prior to any branch supply trunk ortake--off. The height of the plenum should be at least as high(upflow/downflow) or as long (horizontal) as the width of onefurnace. Supply air dampers, when used should be installed in thebranch ducts, not in the common plenum. Fire or smoke dampers,when required by code may be installed in the common plenum.Refer to the damper manufacturer’s ratings installation instructionsfor proper application. The damper should not create unduerestriction in the open position.

All furnaces must be installed to ensure sufficient return air to bothfurnaces:S For upflow furnaces: A combination of 1 full side of each and

bottom inlet plenum or bottom only inlet plenum shall be used

for return air to each furnace. The preferred method is to have all

return air brought into the bottom of the furnaces through a

common bottom plenum. The bottom return--air plenum shall be

at least as high as the width of the furnace bottom return--air

opening. When there are height limitations, the bottom

return--air plenum height can be reduced to 8 in. minimum if 1

entire side return--air opening of each furnace is used in

conjunction with the bottom return opening. Rear inlet plenums

shall not be used. (See Fig. 1.) Connect all return trunks or

branch return ducts to common return plenum.

S For downflow and horizontal furnaces: All return air must be

brought into the bottom opening of the furnace through a

common return air plenum. The return--air plenum shall be at

least as long (horizontal) or tall (downflow) as the width of the

furnace return--air opening. (See Fig. 2). Connect all return

trunks or branch return ducts to common return plenum.

S For all furnaces: Fire or smoke dampers, when required by

code may be installed in the common return plenum. Refer to

the damper manufacturer’s ratings installation instructions for

proper application. The damper should not create undue

restriction in the open position.

FIRE HAZARD

Failure to follow this warning could result in improperauxiliary limit operation, fire, personal injury or death.

Do not remove the center return--air partitions between thefurnaces.

! WARNING

Staged heating operation is permitted only with this twinning kit.With the single--speed, non--condensing, and condensing furnaces,the left--hand furnace is used for first--stage heat, and both furnacesare used for second--stage heat. With the 2--stage, non--condensingand condensing furnaces, low--gas heat in both furnaces is used forfirst--stage heat, and high--gas heat in both furnaces is used forsecond--stage heat. This kit ensures both furnace blowers operatesimultaneously so air flows through the duct work rather thanrecirculating in a loop between the furnaces.

KGATW

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A02223

Fig. 1 -- Upflow Ductwork Connections

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A02224

Fig. 2 -- Downflow/Horizontal Ductwork Connections

KGATW

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Table 1 – Kit ContentsDESCRIPTION PART NO. QUANTITYSealing tape 2

External extension harness 327962-701 1

Main twinning harness 327957-701 1

Secondary twinning harness 327959-701 1

Two-stage furnace wiring diagram 327891-101 1

Single-stage furnace heat wiring diagram 327893-101 1

Single-stage furnace/two-stage heat wiring diagram 327892-101 1

Label 327956-101 1

Tape 1

Bag Assembly includes:Snap bushing 2

Screws (HEX HD 6B X ¾) 10

Screws (flat head) 1

Wire tie 4

Clamps 2

Installation Instructions 1

NOTE: As a result of staged heating with single--speed furnaces,the air temperature distribution in the supply plenum may beuneven when only 1 furnace is heating.

NOTE: Refer to the Installation, Start--Up, and OperatingInstructions supplied with each furnace for information on venting,clearances, start--up, maintenance, and other information notcovered in this publication.

See Table 1 for kit contents.

ELECTROSTATIC DISCHARGE (ESD)PRECAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in unit andcomponent damage.

Failure to follow this caution could result in unit andcomponent damage. Electrostatic discharge can affectelectronic components. Take precautions during furnaceinstallation and servicing to protect the furnace electroniccontrol. Precautions will prevent electrostatic discharges frompersonnel and hand tools which are held during the procedure.These precautions will help to avoid exposing the control toelectrostatic discharge by putting the furnace, the control, andthe person at the same electrostatic potential.

CAUTION!

1. Disconnect all power to the furnace. DO NOT TOUCHTHE CONTROL OR ANY WIRE CONNECTED TO THECONTROL PRIOR TO DISCHARGING YOUR BODY’SELECTROSTATIC CHARGE TO GROUND.

2. Firmly touch a clean, unpainted, metal surface of the fur-nace chassis which is close to the control. Tools held in aperson’s hand during grounding will be satisfactorily dis-charged.

3. After touching the chassis you may proceed to service thecontrol or connecting wires as long as you do nothing thatrecharges your body with static electricity (for example; DONOT move or shuffle your feet, DO NOT touch ungroun-ded objects, etc.).

4. If you touch ungrounded objects (recharge your body withstatic electricity), firmly touch furnace again before touch-ing control or wires.

5. Use this procedure for installed and uninstalled (ungroun-ded) furnaces.

6. Before removing a new control from its container, dischargeyour body’s electrostatic charge to ground to protect thecontrol from damage. If the control is to be installed in afurnace, follow items 1 through 5 before bringing the con-trol or yourself into contact with the furnace. Put all usedAND new controls into containers before touching un-grounded objects.

7. An ESD service kit (available from commercial sources)may also be used to prevent ESD damage.

KGATW

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SECTION I: MULTIPOISE SINGLE--SPEED AND TWO--SPEED NON--CONDENSING HSIFURNACE MODELS

SINGLE--STAGE SINGLE--STAGE TWO--STAGE TWO--STAGE

58STA 310AAV 58CTA 312AAV

58STX 310JAV 58CTX 312JAV

58DLA 311AAV

58DLX 311JAV

PG8MAA

AD

E

AD

E

A02235

Fig. 3 -- Dimensional Drawing

Table 2 – Dimensions -- In. (mm) for Two--Stage with PSC Blower

UNIT SIZE A B C VENT CONN.* SHIP WT. – LB.(KG)

045-08/024045 14-3/16 (360) 12-9/16 (319) 12-11/16 (322) 4 104 (47)

045-120/036045 14-3/16 (360) 12-9/16 (319) 12-11/16 (322) 4 107 (49)

070-08/024070 14-3/16 (360) 12-9/16 (319) 12-11/16 (322) 4 111 (50)

070-12/036070 14-3/16 (360) 12-9/16 (319) 12-11/16 (322) 4 115 (52)

070-16/048070 17-1/2 (445) 15-7/8 (403) 16 (406) 4 126 (57)

090-14/042090 17-1/2 (445) 15-7/8 (403) 16 (406) 4 127 (58)

090-16/048090 21 (533) 19-3/8 (492) 19-1/2 (495) 4 140 (64)

090-20/060090 21 (533) 19-3/8 (492) 19-1/2 (495) 4 146 (66)

110-12/036110 17-1/2 (445) 15-7/8 (403) 16 (406) 4 135 (61)

110-16/048110 21 (533) 19-3/8 (492) 19-1/2 (495) 4 146 (66)

110-22/066110 21 (533) 19-3/8 (492) 19-1/2 (495) 4 152 (69)

135-16/048135 21 (533) 19-3/8 (492) 19-1/2 (495) 4 149 (68)

135-22/066135 24-1/2 (622) 22-7/8 (581) 23 (584) 4 163 (74)

155-20/060155 24-1/2 (622) 22-7/8 (581) 23 (584) 4 170 (77)*5---in. or 6---in. (127 or 152 mm) vent connector may be required in some cases.

NOTE: Throughout these instructions, when the furnace installedside--by--side, the left--hand (LH) side will be referred to as the LHfurnace, and the furnace installed on the right--hand (RH) side asthe RH furnace. When the furnaces are installed back--to--back, theleft--hand (LH) side will be referred to as the LH furnace, and thefurnace installed on the right--hand (RH) side as the RH furnacewhen viewed from the side with the extension harness installed.

PROCEDURE 1 — INSTALL FURNACES

A. Upflow/Downflow, Side--by--Side PositionRefer to Fig. 3 and Table 2 for appearance and dimensionaldrawing of twinned furnaces and their connection locations.

1. Select 2 identical heating and airflow furnaces. (See Table2.)

2. Remove outer door and blower access door.

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3. For upflow and downflow applications:

a. For upflow applications: Bottom return air usage is re-quired as part of any upflow return air configuration. Ifadditional return air is to enter 1 side of each furnace, inaddition to bottom return air, cut open 1 entire return--air opening in appropriate side of each furnace. (SeeFig. 1.)

UNIT DAMAGE AND FIRE HAZARD

Failure to follow this warning could result in fire, personalinjury or death.

DO NOT use the back of the furnace for return--air ductconnections, as limit cycling will occur.

! WARNING

b. For downflow applications:Return air can only be connected to bottom opening offurnace. A common return air plenum is required forproper auxiliary limit switch operation. (See Fig. 2.)


Failure to follow this warning could result in unit damage, fire,personal injury or death.

DO NOT use the back or sides of the furnace for return--airduct connections in the downflow position, as limit switchcycling will occur.

! WARNING

4. Remove bottom closure panels from both furnaces. (SeeFig. 4.)

a. Lay furnaces on back or sides.

b. Remove 2 screws from bottom front panel.

c. Pull front panel forward to remove.

d. Remove bottom closure panel and discard.

e. Reinstall bottom front panel.

f. Stand furnaces upright.

5. Apply 2 factory--supplied foam strips to mating side of eachfurnace. Locate strips equal distance from top and bottom asshown in Fig. 5. Trim off excess material.

BottomClosure Panel

Bottom Filler Panel

A10273

Fig. 4 -- Removing Bottom Closure Panel

A10274

Fig. 5 -- Location of Foam Strips

6. Remove 7/8--in. diameter accessory hole knock--outs inblower compartment from mating sides of furnaces. (SeeFig. 3.)

7. Insert a plastic snap bushing through the 7/8--in. knock--outfrom the outside of the casing.

8. Bend or remove the supply flanges as required for upflowor downflow installation. Refer to the furnace installationinstructions for complete details.

9. Position furnaces against each other on return air plenum,supply air plenum or evaporator coil casing. Adjust andshim each furnace to align 7/8--in. diameter holes in bothfurnaces.

10. Drill two 1/8--in. holes, approximately 1 in. (25 mm)belowdischarge flange, from inside top of discharge opening andthrough both furnaces. (See Fig. 6.) Drill two 1/8--in. holes,approximately 1 in. (25 mm)below return air flange, frominside top of return air opening and through both furnaces.(See Fig. 7. as an example).

11. Drive 1 factory--supplied screw through each hole and tight-en until furnaces are secure and foam strips have sealed gapbetween furnaces.

12. Connect return-- and supply--air ducts to furnaces. Seal ductconnections to prevent air leakage.

13. Move 115--v junction box JB in RH furnace (as viewedfrom the upflow position) from left--hand side to right--handside. Refer to furnace installation instructions for completedetails.

14. Go to PROCEDURE 2A for Single Stage Furnaces orPROCEDURE 2B for Two Stage Furnaces.

B. Upflow/Downflow, Back--to--Back PositionRefer to Fig. 3 and Table 2 for appearance and dimensionaldrawing of twinned furnaces and their connection locations.










4. Applications

KGATW

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A02232

Fig. 6 -- Attaching Furnaces Together at Discharge Opening

a. For upflow applications:Bottom return air usage is required as part of any up-flow return air configuration. If additional return air is toenter 1 side of each furnace, in addition to bottom returnair, cut open 1 entire return--air opening in appropriateside of each furnace. (See Fig. 2.)



DO NOT use the side of the furnace for return--air ductconnections in the downflow position, as limit cycling willoccur.

! WARNING

b. For downflow applications:Return air can only be connected to bottom opening offurnace. A common return air plenum is required forproper auxiliary limit switch operation. (See Fig. 3.)

5. Apply 2 factory--supplied foam strips to the back of eachfurnace. Locate strips equal distance from top and bottom asshown in Fig. 5. Trim off excess material.

6. Determine which side of furnace will be used to route ex-ternal extension harness. Remove 7/8--in. diameter access-ory hole knockouts in blower compartment side selected toattach harness to. (See Fig. 3.)

7. Bend or remove the supply flanges as required for upflowor downflow installation. Refer to the furnace installationinstructions for complete details.

8. Position furnaces back--to--back on return--air plenum, sup-ply air plenum or evaporator coil casing. Adjust and shimeach furnace to align both furnaces.

NOTE: External extension harness cannot be used on the sameside of the furnace that the return air ducts connect to. Locateharness on opposite side of furnace when side return air is used.

9. Drill two 1/8--in. holes, approximately 1 in. (25 mm)belowdischarge flange, from inside top of discharge opening andthrough both furnaces. (Similar to Fig. 6.) Drill two 1/8--in.holes, approximately 1 in. (25 mm)below return air flange,from inside top of return air opening and through both fur-naces. (Similar to Fig. 7.)

10. Drive 1 factory--supplied No. 6 X 3/4--in. LG screw througheach hole and tighten until furnaces are secure and foamstrips have sealed gap between furnaces.


A02219

Fig. 7 -- Attaching Furnaces Together at Return Air Opening

12. Move 115--v junction box JB in either furnace from left--hand side to right--hand side if required. Refer to furnaceinstallation instructions for complete details.

13. Go to Step 2A for Single Stage Furnaces or Step 2B forTwo Stage Furnaces.

C. Horizontal, Back--to--Back PositionWhen twinning furnaces in the horizontal position, considerationmust be made to the type of building construction. Attic floorsshould be constructed to support normal live and dead loads of thefurnaces and the person(s) servicing them.

Trusses, wood and metal are engineered for specific applications,and may not support the weight of two (2) furnaces suspendedfrom the top chords or the bottom chords of the trusses. Longhorizontals spans may flex or sag, resulting in damage to thebuilding. Contact the truss manufacturer for additional design andengineering assistance.

Do not suspend furnaces with straps or suspend furnaces from roofdecking.

For attic installations on a platform (See Fig. 8.):

1. Construct a platform from 3/4--in. (76 mm) (nominal ply-wood), extending out 30 inches (762 mm) from the front ofeach furnace.

2. Maintain all clearances to combustibles per the furnace In-stallation, Start--up and Operating Instructions.

3. Follow all additional building codes.

4. Long truss spans may require additional support along thebottom chord of the truss. Consult the truss manufacturer’sguidelines for engineering assistance.

5. Long rafter or attic joist spans may require additional sup-port along the bottom of the rafter or joist. Consult local orregional building codes for design and loading require-ments.

For suspended installations (See Fig. 9.) Not recommended forwood trusses unless approved by the truss manufacturer or otherapproved engineering methods):

1. Furnaces may be suspended using two (2) pieces of1--1/2--in. x 1--1/4--in x 1/4--in. thick cold rolled angle ironunderneath the furnaces and four (4) 3/8--in. diameterthreaded rods.

2. Allow for at least 9 inches (229 mm) in front of each doorfor door removal.

3. Each piece of angle iron must be secured to the bottom ofeach furnace with at least two (2) #8 x 3/4--in. sheet metalscrews.


KGATW

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A10275

Fig. 8 -- Attic Installation of Horizontal Back--to--Back Furnaces

A10276

Fig. 9 -- Suspended Installation for Horizontal Furnaces Back--to--Back

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5. Unistrut or similar material may be used, provided that thefurnaces do not sag in the middle or bend or twist at thesupport ends. The support material must be secured to thebottom of each furnace in a manner similar to securingangle iron to the furnace.

Refer to Fig. 3 and Table 2 for appearance and dimensionaldrawing of twinned furnaces and their connection locations.







d. Remove bottom closure panel and set aside for possibleuse as roll--out protection.



4. For All Horizontal applications:Return air can only be connected to bottom opening of fur-nace. (See Fig. 2.) A common return air plenum is requiredfor proper auxiliary limit switch operation.



DO NOT use the side or back of the furnace for return--air ductconnections in the horizontal position, as limit cycling willoccur.

! WARNING

5. Apply 2 factory--supplied foam strips to the back of eachfurnace. Locate strips equal distance from top and bottom asshown in Fig. 5. Trim off excess material.

6. Determine which side of furnace will be used to route ex-ternal extension harness. Remove 7/8--in. diameter access-ory hole knockouts in blower compartment side selected toattach harness to. (See Fig. 3.)

7. Position furnaces back--to--back on attic platform or suspen-ded supports. Adjust and shim each furnace to align bothfurnaces. Follow all clearance to combustible material.

8. If furnaces are installed closer than 12 inches above a deckmade from combustible material, provide roll--out protec-tion as shown in the furnace installation instructions. Thebottom closure pan may be used for this purpose.

NOTE: DO NOT lay furnace down flat on the side that externalextension harness is installed. Raise furnace up a minimum of1--1/2 inches (38 mm) above deck so harness does not rub oncasing or deck.

9. Drill two 1/8--in. holes, approximately 1 in. (25 mm)belowdischarge flange, from inside top of discharge opening andthrough both furnaces. (See Fig. 6.) Drill two 1/8--in. holes,approximately 1 in. (25 mm)below return air flange, frominside top of return air opening and through both furnaces.(Use Fig. 6 as an example).

10. Drive 1 factory--supplied No. 6 X 3/4--in. LG screw througheach hole and tighten until furnaces are secure and foamstrips have sealed gap between furnaces.


12. Move 115--v junction box JB in either furnace from left--hand side to right--hand side if required. Refer to furnaceinstallation instructions for complete details.


D. Horizontal, Stacked TogetherWhen twinning furnaces in the horizontal position, considerationmust be made to the type of building construction. Attic floorsshould be constructed to support normal live and dead loads of thefurnaces and the person(s) servicing them.

Trusses, wood and metal are engineered for specific applications,and may not support the weight of two (2) furnaces suspendedfrom the top chords or the bottom chords of the trusses. Longhorizontals spans may flex or sag, resulting in damage to thebuilding. Contact the truss manufacturer for additional design andengineering assistance.


For attic installations on a platform, see Fig. 10:

1. Construct a platform from 3/4--in. (nominal plywood), ex-tending out 30 inches (762 mm) from the front of each fur-nace.





For suspended installations, see Fig. 11. Not recommended forwood trusses unless approved by the truss manufacturer or otherapproved engineering methods):

1. Furnaces may be suspended using two (2) pieces of1--1/2--in. x 1--1/2--in. x 1/4--in. thick cold rolled angle ironunderneath the furnaces and four (4) 3/8--in. diameterthreaded rods.


3. Each piece of angle iron must be secured to the bottom ofeach furnace with at least two (2) #8 x 3/4--in. sheet metalscrews.









c. Rotate front panel downward to remove.

d. Remove bottom closure panel and set aside for possibleuse as roll--out protection.


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4. For all horizontal applications: Return air can only be con-nected to bottom opening of furnace.

5. Apply 2 factory--supplied foam strips to mating side of eachfurnace. Locate strips equal distance from top and bottom asshown in Fig. 5.

6. Remove 7/8--in. diameter accessory hole knockouts inblower compartment from mating sides of furnaces. (SeeFig. 3.)

7. Insert a plastic snap bushing through the 7/8--in. K.O. fromthe outside of the casing.

8. Position furnaces on top of each other on platform or sus-pended supports. Adjust and shim each furnace to align7/8--in. diameter holes in both furnaces.

9. Drill two 1/8--in. holes, approximately 1 in. (25 mm)belowdischarge flange, from inside top of discharge opening andthrough both furnaces. (See Fig. 6.) Drill two 1/8--in. holes,approximately 1 in. (25 mm)above return air openingflange, from inside blower compartment and through bothfurnaces. (See Fig. 7.)

10. Drive 1 factory--supplied screw through each hole and tight-en until furnaces are secure and foam strips have sealed gapbetween furnaces.


12. Move 115--v junction box JB in RH furnace (as viewedfrom the upflow position) from left--hand side to right--handside. Refer to furnace installation instructions for completedetails.


PROCEDURE 2 — CONNECT ELECTRICALCOMPONENTS—HEATING

A. All Single--Stage Models: 58STA, 58STX, 58DLA, 58DLX,310AAV, 310JAV, 311AAV, 311JAV, PG8MAA, ANDPG8JAA Multipoise Single--Speed Non--Condensing HSIFurnaces

FIRE HAZARD


Make no connections between the R 24--vac connector in 1furnace and the R 24--vac connector in other furnace.

! WARNING

See Electrostatic Discharge Precaution Section.

A10277

Fig. 10 -- Attic Installation of Horizontal Furnace Stacked Together

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3/8″ Flat Washer

3/8″ Hex Nut

3/8″ Flat Washer

11/2″ x 11/2″ x 1/4″ Angle Iron

3/8″ Lock Washer

3/8″ Theaded Rod

3/8″ Lock Washer3/8″ Hex Nut

A10278

Fig. 11 -- Suspended Installation for Horizontal Furnaces Stacked Together

The twinning kit can be used for single--stage or 2--stage heatingoperation. There are 3 harness assemblies included in this kit. If thefurnaces are side--by--side, only 2 harness assemblies are required.If the furnaces are installed back--to--back, all 3 harness assembliesincluded in the kit must be used.

1. Remove outer doors and blower access doors from both fur-naces.

2. If furnaces are installed back--to--back in any orientation, theexternal Extension Harness must be used. The harness con-sists of:

a. 54--1/2 inches (1384 mm) of 1/2--in. flexible steel con-duit

b. (2) 90_ conduit connectors

c. (1) 4 wire polarized wiring harness d. (1) 2 wire polar-ized wiring harness

3. Install the Extension Harness as follows:

a. Remove lock nuts from the end of each conduit con-nector.

b. Route the end of the harness, labeled “twinning kit har-ness,” that mates to the TRK relay harness from theoutside of the furnace through the 7/8--in. knock--out inthe casing to the blower compartment.

c. Route the end of the harness that mates to the 4--wireharness through the outside of the furnace through the7/8--in. knockout in the casing to the blower compart-ment.

d. Install the lock nuts on the 90_ conduit connectors.

e. Install 2 kit--supplied straps approximately 18 inches(457 mm) from each end of harness.

Single--Stage Heat with Single--Stage Gas--Heat Thermostat(Field--Supplied)

NOTE: This application allows both furnaces to operate as 1furnace in gas heat mode as determined by single--stage thermostatoperation. Both furnaces operate in heating mode simultaneously.See furnace Installation, Start--Up, and Operating Instructions forfurther details on this heating mode.

1. Install harness labeled “Main Furnace” with TKR on L/HFurnace:The Main Harness includes the TKR relay and AuxiliaryLimit switch on the harness. The harness is also tagged“Main Furnace” near the ends of the plug connector.

a. Secure relay of TKR harness assembly to LH furnaceblower housing using 2 factory--supplied screws. (SeeFig. 12.)

NOTE: See Fig. 15 for Single Stage furnace Twinning Kit wiringdiagram.

b. Connect TKR white wire labeled W from TKR to LHfurnace control thermostat connection W.

c. Connect TKR black wire labeled C from TKR to LHfurnace control thermostat connection COM 24V.

d. Connect yellow wire labeled TEST to LH furnace con-trol TEST/TWIN terminal.

e. If Extension Harness was used, connect 4--wire harnessto Extension Harness.

NOTE: If Extension Harness will not plug in to L/H and R/Hfurnaces, extension harness is installed backward. Removeextension harness and re--install in correct orientation.

2. Install Auxiliary Limit Switch (ALS--M) on L/H furnace:

KGATW

12

A10279

Fig. 12 -- TKR Relay Secured with Factory--Supplied Screws

a. Drill 1/8--in. hole in blower housing 12 in. (305mm)below blower shelf. (See Fig. 13.)

b. Position ALS--M so reset button faces front of furnace.

c. Secure bracket to blower housing using a factory--sup-plied screw.

d. Disconnect red transformer wire from LH furnace con-trol SEC--1 connection.

e. Connect red transformer wire connector to ALS--M wireconnector PL7 labeled TRAN.

f. Connect orange ALS--M wire connector labeled DOORSWITCH or SEC 1 to LH furnace control SEC--1 ter-minal.

g. If Extension Harness was used, connect 2--wire harnessto Extension Harness

3. Install Secondary 4--wire harness on R/H furnace:

The Secondary Harness includes the Auxiliary Door Switch andAuxiliary Limit Switch. The harness is also tagged “SecondaryFurnace” near the plug ends of the harness.

a. Connect red wire labeled R--Secondary to RH furnacecontrol thermostat connection R.

b. Connect white wire labeled W--Secondary to RH fur-nace control thermostat connection W.

c. Connect black wire labeled C--Secondary to RH furnacecontrol thermostat connection COM 24V.

d. Connect yellow wire labeled TEST SECONDARY fromLH furnace control TEST terminal to RH furnace con-trol TEST terminal.

e. If the furnaces are side--by--side, route loose ends of4--wire harness from Secondary furnace to Main furnacethrough EWIN snap bushings previously installedbetween furnaces. (See Fig. 4.)

f. Connect Secondary 4--wire harness into 4--wire Mainharness.

g. If Extension Harness was installed, connect 4--wire Sec-ondary Harness to the Extension Harness.

4. Install Auxiliary Limit Switch, ALS--S on Secondary fur-nace:

a. Drill 1/8--in. hole in blower housing 12 in. (305 mm)be-low blower shelf. (See Fig. 13.)

b. Position ALS--S with terminals facing front of furnace.

c. Secure bracket to blower housing using factory--sup-plied screw.

5. Install Auxiliary Blower Door Interlock Switch, ILK--1 onSecondary furnace:

a. Measure along the left edge of the furnace casing, 6inches (152 mm) down from blower shelf.

b. Drill a 3/16--in. clearance hole through front edge ofblower door support.

c. Insert blower door switch mounting tab behind frontedge of blower door support.

d. Secure auxiliary door switch ILK--1 using factory--sup-plied screw.

e. Connect 2--Wire Secondary Harness to 2--wire MainHarness that was routed through furnace casings.

KGATW

13

A10280

Fig. 13 -- Auxiliary Door Switch

f. If extension harness was installed, 2--wire SecondaryHarness from Secondary to Main Extension Harness.


6. Select identical blower motor speed taps at control centerconnectors in both furnaces.

UNIT DAMAGE HAZARD

Failure to follow this caution may result equipment damage.

Failure to select identical blower speed taps in both furnacescan result in overheating of furnace components and possibleloss of furnace operation and damage to the furnaces.

CAUTION!

7. Dress wires to ensure they do not contact sharp or movingparts nor interfere with blower operation, removal of filters,or operation of switches.

8. Make all thermostat connections to LH furnace only. SeeFig. 15.

Two--Stage Heat with 2--Stage Gas--Heat Thermostat (FieldSupplied)

NOTE: ALL thermostat connections are to be made to LH furnacecontrol ONLY. (See Fig. 16.)

NOTE: This application allows only the LH furnace to operate forfirst--stage heat mode or both furnaces to operate for second--stage

heat mode as determined by a 2--stage thermostat. See furnaceInstallation, Start--Up, and Operating Instructions for further detailson this heating mode.

To operate furnaces in 2--stage heating mode when a 2--stagethermostat controls the staging, install twinning kit as described inSingle--Stage Heat with Single--Stage Gas Heat Thermostat, thenmodify TKR wiring as follows:

a. Disconnect TKR white wire labeled W from the LHfurnace control thermostat connection W.

b. Cut off terminal of TKR white wire labeled W and strip1/4 in. (6 mm).

c. Connect 2--stage thermostat W2 connection to TKRwhite wire labeled W.

PERSONAL INJURY HAZARD

Failure to follow this caution could result in intermittentfurnace operation and unit damage.

Supply--air temperature will be uneven left--to--right whenonly main system is operating.

CAUTION!

NOTE: ALL other 2--stage thermostat connections are to be madeto LH furnace control ONLY. (See Fig. 16.)

B. All Two--Stage Models: 58CTA, 58CTX, 312AAV, 312JAVMultipoise Two--Speed Non--Condensing HSI Furnaceswith PSC Motors

KGATW

14

FIRE HAZARD



! WARNING


The twinning kit can be used for single--stage or 2--stage heatingoperation. There are 3 harness assemblies included in this kit. If thefurnaces are side--by--side, only 2 harness assemblies are required.If the furnaces are installed back--to--back, all 3 harness assembliesincluded in the kit must be used.


2. If furnaces are installed back--to--back in any orientation, theexternal Extension Harness must be used. The harness con-sists of:

a. 54--1/2--in. of 1/2--in. flexible steel conduit


c. (2) 4 wire polarized wiring harness

d. (2) 2 wire polarized wiring harness

3. Install the Extension Harness as follows:


b. Route the end of the harness labeled “Twinning Kit Har-ness” that mates to the TKR relay harness from the out-side of the furnace through the 7/8--in. knock--out in thecasing to the blower compartment.

c. Route the end of the harness that mates to the 4--wireharness through the outside of the furnace through the7/8--in. knockout in the casing to the blower compart-ment.


Two--Stage Heat with Single--Stage Gas--Heat Thermostat (FieldSupplied) (See Fig. 17.)

NOTE: This application allows both furnaces to operate as 1furnace in gas heat mode as determined by single--stage thermostatoperation. Both furnaces operate in heating mode simultaneously.See furnace Installation, Start--Up, and Operating Instructions forfurther details on this heating mode.

1. Install harness labeled “Main Furnace” with TKR on L/HFurnace: The Main Harness includes the TKR relay andAuxiliary Limit switch on the harness. The harness is alsotagged “Main Furnace” near the ends of the plug connector.

a. Secure relay of TKR harness assembly to LH furnaceblower housing using 2 factory--supplied screws. Twonew screw holes will have to be drilled using a 1/8--inchdrill bit. See Fig. NO TAG for location of holes to bedrilled.

b. Connect TKR white wire labeled W from TKR to LHfurnace control thermostat connection W/W1.

c. Connect TKR black wire labeled C from TKR to LHfurnace control thermostat connection COM 24V.

d. Connect yellow wire labeled TEST to LH furnace con-trol TEST/TWIN terminal.

e. If Extension Harness was used, connect 4--wire harnessto Extension Harness.

f. Turn LHT set--up switch on L/H control board to“OFF.” (See Fig. 14.)

g. Turn LHT set--up switch on R/H control board to “ON.”


2. Install Auxiliary Limit Switch (ALS--M) on L/H furnace:

a. Drill 1/8--in. hole in blower housing 12 in. (305mm)below blower shelf. (See Fig. 13.)


c. Secure bracket to blower housing using a factory--sup-plied screw.

d. Disconnect red transformer wire from LH furnace con-trol SEC--1 connection.

e. Connect red transformer wire connector to ALS--M wireconnector PL7 labeled TRAN.

f. Connect ALS--M orange wire connector labeled SEC 1to LH furnace control SEC--1 terminal.

g. If Extension Harness was used, connect 2--wire harnessto Extension Harness

3. Install Secondary 4--wire harness on R/H furnace:

The Secondary Harness includes the Auxiliary Door Switch andAuxiliary Limit Switch. The harness is also tagged “SecondaryFurnace” near the plug ends of the harness.

a. Connect red wire labeled R--Secondary to RH furnacecontrol thermostat connection R.

b. Connect white wire labeled W--Secondary to RH fur-nace control thermostat connection W/W1.

c. Connect black wire labeled C--Secondary to RH furnacecontrol thermostat connection COM 24V.

d. Connect yellow wire labeled TEST SECONDARY toRH furnace control TEST/TWIN terminal.

e. If the furnaces are side--by--side, route loose ends of4--wire harness from Secondary furnace to Main furnacethrough snap bushings previously installed betweenfurnaces.

f. Connect Secondary 4--wire harness into 4--wire Mainharness.

g. If Extension Harness was installed, connect 4--wire Sec-ondary Harness to the Extension Harness.

4. Install Auxiliary Limit Switch, ALS--S on Secondary fur-nace:

a. Drill 1/8--in. hole in blower housing 12 in. (305 mm)be-low blower shelf. (See Fig. 13.)

b. Position ALS--S with terminals facing front of furnace.

c. Secure bracket to blower housing using factory--sup-plied screw.

5. Install Auxiliary Blower Door Interlock Switch, ILK--1 onSecondary furnace:

a. Measure along the left edge of the furnace casing, 6inches (152 mm) down from blower shelf.

b. Drill a 3/16--in. clearance hole through front of blowerdoor support.

c. Insert blower door switch mounting tab behind frontedge of blower door support.

d. Secure auxiliary door switch ILK--1 using factory--sup-plied shallow head screw.

e. Connect 2--Wire Secondary Harness to 2--wire MainHarness that was routed from Secondary to Main fur-nace casings.

f. If extension harness was installed, 2--wire SecondaryHarness to Extension Harness.


KGATW

15

#2�1��'#:

1�

�

16

�3=�� #� �2�� $��2��

#2�� #2��

��$��$�� 1�� 16

��$�� 16 16

A02221

Fig. 14 -- LHT Switch Settings

6. Select identical blower motor speed taps at control motorconnectors in both furnaces.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in unit damage.

Failure to select identical blower speed taps in both furnacescan result in overheating of furnace components and possibleloss of furnace operation and damage to the furnaces

CAUTION!

7. Dress wires to ensure they do not contact sharp or movingparts nor interfere with blower operation, removal of filters,or operation of switches.

8. Make all thermostat connections to LH furnace only.

Two--Stage Heat with 2--Stage Gas--Heat Thermostat (FieldSupplied)

NOTE: ALL thermostat connections are to be made to LH furnacecontrol ONLY. (See Fig. 17.)

NOTE: This application allows both furnaces to operate in lowheat for first--stage heat mode or both furnaces to operate in highheat for second--stage heat mode as determined by a 2--stagethermostat. See furnace Installation, Start--Up, and OperatingInstructions for further details on this heating mode.

To operate furnaces in 2--stage heating mode when a 2--stagethermostat controls the staging, install twinning kit as described inthe two--stage heat with single--stage gas heat thermostat:

a. Turn LHT set--up switch on L/H control board to “ON.”

b. Turn LHT set--up switch on R/H control board to “ON.”

NOTE: ALL other 2--stage thermostat connections are to be madeto LH furnace control ONLY. (See Fig. 17.)

PROCEDURE 3 — CONNECT ELECTRICALCOMPONENTS--COOLING



Failure to follow warning could result in fire, personal injuryor death. Make no connections between the R 24--vacconnector in 1 furnace and the R 24--vac connector in otherfurnace.

! WARNING

When installing twinned outdoor units with twinned gas furnaces,it is necessary to use a field--supplied 24--vac pilot--duty relay and a

field--supplied 24/115--vac transformer as shown in Fig. 15, 16, or17 to prevent overloading furnace 24/115--vac transformer.

PROCEDURE 4 — VENTING

Refer to Installation, Start--Up, and Operating Instructions suppliedwith each furnace for venting information.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in unit damage

When common--venting twinned, Category I(negative--pressure venting), non--condensing furnaces,excessive condensate may occur as a result of oversized ventsystems. Dedicated vents and/or proper vent sizing, per thecurrent edition of the National Fuel Gas Code, will reduce thepotential for condensation.

CAUTION!

PROCEDURE 5 — GAS SUPPLY PIPING

NOTE: All gas connections must be made through exposed outerside of each furnace. Do not common connect any connectionother than supply and return--air ducts.

Furnaces are recommended to be provided with a single shutoffvalve. However, individual shutoff valves may be required by localcodes or jurisdictions. Refer to Installation, Start--Up, andOperating Instructions provided with each furnace for additionalgas supply information.

PROCEDURE 6 — ELECTRICAL SUPPLYCONNECTIONS

NOTE: All electrical power connections must be made throughexposed outer side of each furnace. Do not common connect anyconnection other than supply-- and return--air ducts.

1. Each furnace shall be connected to its own 115--vac powersupply. The twinning kit installation interconnects the fur-naces, allowing them to operate as a single furnace. The L1(black) connection to each furnace must be connected to cir-cuit breakers connected to the same service panel 115--vacphase leg.On single--phase (residential) systems, each furnace circuitbreaker should be located directly across from each other inservice panel, or each furnace circuit breaker should be loc-ated on the same side of service panel, but must skip 1 spaceto be connected to the same leg of the 1--phase power sup-ply.On 3--phase (commercial) systems, each furnace circuitbreaker should be located directly across from each other inservice panel, or each furnace circuit breaker should be loc-ated on the same side of service panel, but must skip 2spaces to be connected to the same leg of the 3--phase

KGATW

16

power supply.The proper 115--vac phasing of furnace connections permits24--vac transformer phasing as described below.

2. Phasing of the connected 24--vac transformer secondary cir-cuits can be determined with the LED status of both fur-naces. See furnace Installation, Start--Up, and Operating In-structions and status code labels on blower doors. Thefurnaces’ transformers’ black leads should be connected to

PR1 connectors and white leads to L2 connectors on con-trols. If 1 or both LEDs are rapidly flashing, disconnect leadat TEST/TWIN terminal of LH furnace and observe LED ateach furnace.To verify that the furnaces are in phase, check from Mainfurnace L1 to Secondary furnace L1 with a voltmeter. If thefurnaces are in phase, the voltage between both furnaceswill be ZERO.

IF:a. Both LEDs are on continuously: System phasing is

okay.

b. One or both LEDs are rapidly flashing:

(1.) Line voltage polarity is reversed

(2.) Reverse SEC--1 and SEC--2 in furnace with rapidflashing LED.

c. One LED is off, 1 LED is on continuously:

(1.) The 24--vac circuit is inoperative on furnace withLED light off.

(2.) Check transformers, auxiliary limits, and doorswitches in both furnaces and correct problem.

d. One or both LEDs are dim or flickering. Furnaces areon different phase legs. Disconnect TWIN/TEST lead. Ifboth LEDs are on continuously when TWIN/TEST isdisconnected, furnace line voltage power supply is outof phase.

3. Reconnect lead at TWIN/TEST terminal of LH furnace andobserve LED at each furnace. The LEDs will glow steadyfor proper phasing.

KGATW

17

THERMOSTAT MAIN ( LH ) FURNACE

RELAY 1

PLCALS-M

PLA

NOTE #5

Y/Y2

G

W

R

COM

Y1

BLK

WHT

TEST/TWIN

TKR

BLU

SEC-2 SEC-1

TRANWHT

BLK

L2

NOTE #2

PR1

BLK

WHT

RED

YEL

PLB

SECONDARY ( RH ) FURNACE

Y/Y2

G

W

R

COM

Y1

TEST/TWIN

BLU

SEC-2 SEC-1

BLK

WHT

RED

YEL

PLB RED

TRANWHT

BLK

L2

NOTE #2

PR1

MAKE NO THERMOSTAT CONNECTIONS TO

SECONDARY OR RH FURNACE

1

2

ORN

BLURED

EXTENSION HARNESS(IF USED)

PLA

1

2

ORN

BLUILK-1 ALS-S

NOTE #1

ORN

NOTE #3

24 VAC

TRANSFORMER (FIELD SUPPLIED) NOTE #4

115 VACC Y

OUTDOOR UNITNO. 1

C Y

OUTDOOR UNITNO. 2

LEGEND: NOTES:

Y

G

W

R

COM

NOTE #3

NOTE #6

327893-101 REV. A

1. ALS-S and ILK-1 are located in the SECONDARY or RH furnace blower compartment.

2. Primary connections of transformer not shown; refer to furnace wire label.

3. When extension harness is not required PLA and PLB must be routed through holes in casings.

4. Transformer = 115 VAC primary / 24 VAC secondary / 40VA.5. Relays = 24 VAC coils / pilot duty / normally open.6. Y1 and DHUM terminal not available on "RED" LED control board.

NOTE #6

ALS-M MAIN AUX. LIMIT SW., OVERTEMP-MANUAL RESET, SPST - (N.C.)

ALS-S SECONDARY AUX. LIMIT SW., OVERTEMP-MANUAL RESET, SPST - (N.C.)

ILK-1 SECONDARY AUX. BLOWER DOOR INTERLOCK SWITCH, SPST - (N.O.)

PLA 2-CIRCUIT TWINNING KIT CONNECTORPLB 4 - CIRCUIT TWINNING KIT CONNECTORPLC 1 - CIRCUIT TWINNING KIT IN-LINE SPLICETEST/TWIN COMPONENT TEST & TWINNING TERMINALTKR TWINNING KIT RELAY, SPST - (N.O.)TRAN TRANSFORMER - 115VAC / 24VAC

(PART OF FURNACE)115 VOLT WIRINGTWINNING KIT EXTENSION HARNESS (REQUIRED)FIELD WIRINGFACTORY WIRING (TWINNING KIT)

FIELD INSTALLED AIR CONDITIONING WIRING (WHEN REQUIRED)SINGLE STAGE FURNACE & A/C-SINGLE STAGE THERMOSTAT

DHUM DHUM

4

1

3

2

4

1

3

2

FIELDSUPPLIED

RELAY

A02227

Fig. 15 -- Single--Stage Furnace and A/C Single--Stage ThermostatKGATW

18

THERMOSTAT

RELAY 1

PLCALS-M

PLARELAY 2

NOTE #5

Y1

Y/Y2

G

W

R

COMBLK

WHTTEST/TWIN

TKR

BLU

SEC-2 SEC-1

TRANWHT

BLK

L2

NOTE #2

PR1

BLK

WHT

RED

YEL

PLB

Y/Y2

G

W

R

COM

Y1

TEST/TWIN

BLU

SEC-2 SEC-1

BLK

WHT

RED

YEL

PLB RED

TRANWHT

BLK

L2

NOTE #2

PR1



1

2

ORN

BLURED


PLA

1

2

ORN

BLUILK-1 ALS-S

NOTE #1

ORN

NOTE #3

24 VAC


115 VAC C Y

OUTDOOR UNITNO. 1

C Y

OUTDOOR UNITNO. 2

LEGEND:

1. ALS-S and ILK-1 are located in the SECONDARY or RH furnace blower compartment.

2. Primary connections of transformer not shown; refer to furnace wire label.

3. When extension harness is not required PLA and PLB must be routed through holes in casings.

4. Transformer = 115 VAC primary / 24 VAC secondary / 40VA.5. Relays = 24 VAC coils / pilot duty / normally open.6. Y1 and DHUM terminal not available on "RED" LED control board.

NOTES:

W2

Y1

G

W/W1

R

COM

Y/Y2NOTE #3

327892-101 REV. A

NOTE #6NOTE #6

DHUM DHUM

4

1

3

2

4

1

3

2

FIELD INSTALLED AIR CONDITIONING WIRING (WHEN REQUIRED) SINGLE STAGE FURNACE & A/C-TWO STAGE THERMOSTAT

ALS-M MAIN AUX. LIMIT SW., OVERTEMP-MANUAL RESET, SPST - (N.C.)

ALS-S SECONDARY AUX. LIMIT SW., OVERTEMP-MANUAL RESET, SPST - (N.C.)

ILK-1 SECONDARY AUX. BLOWER DOOR INTERLOCK SWITCH, SPST - (N.O.)

PLA 2-CIRCUIT TWINNING KIT CONNECTORPLB 4 - CIRCUIT TWINNING KIT CONNECTORPLC 1 - CIRCUIT TWINNING KIT IN-LINE SPLICETEST/TWIN COMPONENT TEST & TWINNING TERMINALTKR TWINNING KIT RELAY, SPST - (N.O.)TRAN TRANSFORMER - 115VAC / 24VAC


FIELD SUPPLIED RELAYS

MAIN ( LH ) FURNACE SECONDARY ( RH ) FURNACE

A02228

Fig. 16 -- Single--Stage Furnace and A/C Two--Stage Thermostat

PROCEDURE 7 — START--UP ANDADJUSTMENT

Refer to Installation, Start--Up, and Operating Instructions suppliedwith furnaces for detailed information.

1. Shut off all power and gas to both furnaces.

2. Position blower off delay switches on controls in BOTHfurnaces to SAME desired gas heat blower off delay. (SeeFig. 18 and 19.) See furnace Installation, Start--Up, andOperating Instructions for further details.

3. Attach twinning connection wiring label above the existingfurnace wiring label on the inside of the L/H furnace blower

access door. Use the following labels for the following ap-plications:

Single Stage furnaces with single--stage thermostat, 327893–101Single Stage furnaces with two--stage thermostat, 327892–101Two Stage furnaces with single--stage or 2--stage thermostat,327891–101

4. Attach twinning reference label 327956–101 on outside ofblower access door of RH furnace blower door.

5. Turn on power and gas to both furnaces.

6. Reinstall blower access doors on both furnaces.

7. Operate furnaces through 2 cycles in each mode to confirmcorrect operation by operating only thermostat.

KGATW

19

THERMOSTAT

RELAY 1

PLCALS-M

PLARELAY 2

NOTE #5

W2

Y/Y2

G

W/W1

R

COM

Y1

BLK

WHT

TEST/TWIN

TKR

BLU

SEC-2 SEC-1

TRANWHT

BLK

L2

NOTE #2

PR1

BLK

WHT

RED

YEL

PLB

W2

Y/Y2

G

W/W1

R

COM

Y1

TEST/TWIN

BLU

SEC-2 SEC-1

4

1

3

2

BLK

WHT

RED

YEL

PLB RED

TRANWHT

BLK

L2

NOTE #2

PR1



1

2

ORN

BLURED


PLA

1

2

ORN

BLUILK-1 ALS-S

NOTE #1

ORN

NOTE #3

24 VAC


115 VAC C Y

OUTDOOR UNITNO. 1

C Y

OUTDOOR UNITNO. 2

ACRDJ AIR CONDITIONING RELAY DISABLE JUMPERALS-M MAIN AUX. LIMIT SW., OVERTEMP-MANUAL

RESET, SPST - (N.C.)ALS-S SECONDARY AUX. LIMIT SW.,

OVERTEMP-MANUAL RESET, SPST - (N.C.)ILK-1 SECONDARY AUX. BLOWER DOOR

INTERLOCK SWITCH, SPST - (N.O.)PLA 2-CIRCUIT TWINNING KIT CONNECTORPLB 4 - CIRCUIT TWINNING KIT CONNECTORPLC 1 - CIRCUIT TWINNING KIT IN-LINE SPLICETEST/TWIN COMPONENT TEST & TWINNING TERMINALTKR TWINNING KIT RELAY, SPST - (N.O.)TRAN TRANSFORMER - 115VAC / 24VAC


LEGEND:1. ALS-S and ILK-1 are located in the SECONDARY or RH furnace

blower compartment.2. Primary connections of transformer not shown; refer to furnace wire

label.3. When extension harness is not required PLA and PLB must be routed

through holes in casings.4. Transformer = 115 VAC primary / 24 VAC secondary / 40VA.5. Relays = 24 VAC coils / pilot duty / normally open.6. Two-stage heating can be accomplished by one of the two methods:

a. Using one stage thermostat and letting the Main Furnace’�s (LH)algorithm control low and high-heat operation.

b. Using a two-stage thermostat to control low and high-heat operation. (Apply "W2" Wire)

NOTES:

LHTOFFDLY

2O

NO

FF

THERMOSTATTYPE

LEFT HANDLHT SWITCH 1

RIGHT HANDLHT SWITCH 1

13 TWO STAGE

THERMOSTATON ON

W2

Y1

G

DHUM

W/W1

R

COM

Y/Y2

327891-101 REV. A

NOTE #3

NOTE #6

4

1

3

2

DHUM

2 STG FURNACES / 1 STG A/C UNIT - TWO-STAGE OPERATION

FIELD SUPPLIED RELAYS

FIELD INSTALLED AIR CONDITIONING WIRING (WHEN REQUIRED)

OFF ON

DHUM

MAIN ( LH ) FURNACE SECONDARY ( RH ) FURNACE

ONE STAGETHERMOSTAT

A02229

Fig. 17 -- Two--Stage Furnaces and 1--Stage A/C Unit -- One or Two--Stage Thermostat

a. Single--stage gas heating thermostat R--to--W operatesboth furnaces gas heat mode. First stage of a 2--stagethermostat causes LH furnace to operate in gas--heatmode. Second stage of a 2--stage thermostat causes bothfurnaces to operate in gas heat mode.

b. Single stage thermostat operates first or second stage ofa two stage furnace, based on the furnace control boardalgorithm. 2--stage heating thermostat R--to--W/W1 willoperate both furnaces in low heat mode. Thermostat R

to W/W1 and--W2 causes both furnaces to operate inhigh gas--heat mode.

c. Thermostat R--to--G for continuous fan or low--coolingblower.

d. Cooling thermostat R--to--G--and--Y for single--speedcooling blower.

8. Reinstall control doors on both furnaces.

9. Instruct user in operation of furnace and thermostat.

KGATW

20

BLW

NU

ET

RA

LS

TATU

S C

OD

E LE

D

SEC-2 SEC-1

EAC-2 L2

FUSE 3-AMP

0.5 AMP@24VAC

HUM

TEST/TWIN

Y1 D

HU

M G

CO

M W

/W1 Y

/Y2 R

24V

PLT

120 180

90 150

BLOWER OFF-DELAY

PLT

1

CO

OL H

EAT

SPARE-1 SPARE-2FAN

EAC-1

1-AMP@

115VAC PR-1

L1

PL2 1

24-V THERMOSTATTERMINALS

3-AMP FUSE

LED OPERATION &DIAGNOSTIC LIGHT

115-VAC(L2)NEUTRALCONNECTIONS

COOLHEAT

SPARE-1

SPARE-2 FANBLOWER SPEED

SELECTION TERMINALS

EAC-1 TERMINAL(115-VAC 1.0 AMP MAX.)

115 VAC (L1) LINEVOLTAGE CONNECTION

PL2-HOT SURFACEIGNITER & INDUCERMOTOR CONNECTOR

PL1-LOW VOLTAGE MAINHARNESS CONNECTOR

TRANSFORMER 24-VACCONNECTIONS

HUMIDIFIER TERMINAL(24-VAC 0.5 AMP MAX.)

TWINNING AND/ORCOMPONENT TEST

TERMINALBLOWER OFF-DELAY

A02142

Fig. 18 -- Single--Stage Furnace Control

PROCEDURE 8 — SEQUENCE OFOPERATION

See Fig. 15, 16, or 17 and 20 or 21 for single--speednon--condensing furnace twinning connection and schematicwiring diagrams while reviewing the sequence of operation.

Twinning operation is controlled by LH furnace. The TWIN/TESTand COM 24v connection wires ensure the 2 furnaces coordinatetheir blower operation. When either furnace requires bloweroperation, both furnaces operate their blowers at the same speed.Both furnaces operate simultaneously in the same mode: heat, cool,or continuous fan. Exceptions can occur if a safety switch on either

furnace is activated (such as pressure switch, flame roll--out switch,main limit switch, draft safeguard switch, twinning kit auxiliarylimit switch, or flame--proving sensor). In such a case, the otherfurnace continues to operate unless open switch is the flameroll--out, main limit, or twinning kit auxiliary limit switch, in whichcase both furnaces respond.

Before performing component test, disconnect TKR yellow wirelabeled TEST from LH furnace control TEST/TWIN terminal.After removing yellow wire, component test can be initiated oneach furnace individually as stated in Installation, Start--Up, andOperating Instructions.

KGATW

21

LHTOFFDLY

ON

OF

FW2

BLW

24-V-THERMOSTAT TERMINALS

SETUP SWITCHESLOW-HEAT ONLY ANDBLOWER OFF-DELAY

TWINNING AND/ORCOMPONENT TEST

TERMINALACRDJ - AIR CONDITIONING

RELAY DISABLE JUMPER

TRANSFORMER 24-VACCONNECTIONS

PL1 - LOW VOLTAGE MAINHARNESS CONNECTOR

PL3

HUMIDIFIER TERMINAL(24-VAC 0.5 AMP MAX.)

3-AMP FUSE

LED OPERATION &DIAGNOSTIC LIGHT

115-VAC (L2) NEUTRALCONNECTIONS

PL2 - HOT SURFACEIGNITER & INDUCERMOTOR CONNECTOR

115-VAC (L1) LINEVOLTAGE CONNECTION

EAC-1 TERMINAL(115-VAC 1.0 AMP MAX.)

BLOWER SPEEDSELECTION TERMINALS

HI HEATLO HEAT

SPARE-1

SPARE-2 COOL

Y1DHUM

GCO

M24V

WW

1Y/Y2

R

TEST/TWIN

HUM

1 2 3

PLT

AC

RD

J

0.5-AMP024 VAC

FUSE 3-AMP

SEC-1 SEC-2

PL1

NEUTRAL-L2

1

EAC-2

BHT/CLRBHI/LORPL3 1

BLWR

COOL

SPARE-1 SPARE-2

1-AMP@115 VAC

EAC-1 PR-1

IDR

HSIR

IDM

IHI/LOR

PL21

HSI HI LO

STATUS

CODELE

D

HI HEATLO

HEAT

L1

A02017

Fig. 19 -- Two--Stage Furnace Control

Single--Stage Heat with Single--Stage Gas--Heat ThermostatSee Section I, Procedure 2 for furnace and kit components used.

1. Single--stage thermostat causes both furnaces to operate inheating mode.

2. Operation in ALL modes is the same for twinned furnacesas for an individual furnace. See furnace Installation, Start--Up, and Operating Instructions for more information on se-quence of operation.

Two--Stage Heat with 2--Stage Gas--Heat ThermostatSee Section I, Procedure 2 for furnace and kit components used.

1. The 2--stage thermostat causes the furnaces to operate infirst--stage heat (LH furnace operates in heat while RH fur-nace blower operates but RH furnace is not heating) orcauses the furnaces to operate in second--stage heat (bothfurnaces operate in heat), depending on whether 1 or 2 ther-mostat stages are calling for heat.

2. Operation in ALL modes is the same for twinned furnacesas for an individual furnace. See furnace Installation, Start--Up, and Operating Instructions for more information on se-quence of operation.

SECTION II: SINGLE--SPEED AND TWO--SPEED MULTIPOISE CONDENSING HSIFURNACE MODELS

SINGLE STAGE TWO---STAGEModel Series Model Series Model Series58MCA 170 and later series 340MAV H and later series 58MTA 110 and later series58MXA 160 and later series 350MAV G and later series 58MTB 100 and later series58MCB 100 and later series PG9MAA E and later series 352MAV B and later series58MXB 100 and later series 340AAV A and later series 352AAV A and later series

58MSA 140 and later series 350AAV A and later series

34MAV E and later series PG9MAB A and later series

KGATW

22

PC

BY

1 R

Y/Y

2

WC

HU

M

EAC

-2

JB

L E G E N D

LS 1

, 2LI

MIT

SW

ITCH

, AU

TO-R

ESET

, SPS

T(N

.C.)

OL

AU

TO-R

ESET

INTE

RNA

L M

OTO

R O

VER

LOA

D

TEM

PERA

TURE

SW

ITC

H (

N.C

.)PC

BPR

INTE

D C

IRC

UIT

BOA

RD C

ON

TRO

LPL

111

-CIR

CUI

T PC

B C

ON

NEC

TOR

PL2

2-C

IRC

UIT

CO

NN

ECTO

RPL

32-

CIR

CU

IT H

SI,

CO

NN

ECTO

RPR

SPR

ESSU

RE S

WITC

H, S

PST-

(N.O

.)TE

ST/T

WIN

CO

MPO

NEN

T TE

ST &

TW

IN T

ERM

INA

LTR

AN

TRA

NSF

ORM

ER-1

15VA

C/2

4VA

C

JUN

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N

UNM

ARK

ED T

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INA

L

PCB

CO

NTR

OL

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INA

L

FAC

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(115

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FAC

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(24V

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115V

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4VA

C)

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CO

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PCB

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G S

CRE

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FIEL

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H G

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ND

EQUI

PMEN

T G

ROU

ND

FIEL

D S

PLIC

E

PLU

G R

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TAC

LE

L1

L1 BLW

RBH

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TO 1

15VA

C F

IELD

DIS

CO

NN

ECT

SWIT

CH

EQU

IPM

EN

T G

RO

UN

D

SPA

RE-

1

HEA

T

FAN

CO

OL

STA

RT

OL

HI

ME

D H

IM

ED L

OLO

BLW

M

SCH

EMAT

IC D

IAG

RAM

(NAT

UR

AL &

PR

OPA

NE

GAS

ES)

1H

SI

2PL

3

CAP

L2

NO

TES:

327560-101 REV. D

om

NEU

TRAL

L2

ILK

FU2

L1

ILK

RED

BLU

OR

N

GRN/YEL

TES

T/TW

IN

24V

FU1

LED

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J1

BLO

WE

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Y

JUM

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R S

ELE

CT

OR

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WH

TW

HT

(C

OM

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BLK

WH

TW

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21

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CA

P

SPA

RE

1S

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C-2

SE

C-1

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180

150

120

90

PL1

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N

BR

N

RE

D (L

O)

WH

T(C

OM

)

YE

L

BLU

(ME

D L

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M

G

DH

UM

BLK

(HI)

(ME

D H

I)

115V

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1

TRA

N

24V

AC

FRS1

FRS2

LGPS

PRS

FSE

IDM

DSS

BVSS

LS1

NO

TE #

10

(WH

EN

US

ED

)

F U

1N

OTE

#6

R W

SEC

-1SE

C-2

HU

MG

VR-2

PL1-

1

CP

U

Y1 G C

GV

R-1

OM

DH

UM

Y/Y

2

1.If

any

of th

e or

igin

al e

quip

men

t wire

is re

plac

ed u

se w

ire ra

ted

for 1

05°C

.2.

Use

onl

y co

pper

wire

bet

wee

n th

e di

scon

nect

sw

itch

and

the

furn

ace

junc

tion

box

(JB)

.3.

This

wire

mus

t be

conn

ecte

d to

furn

ace

shee

t met

al fo

r con

trol t

o pr

ove

flam

e.4.

Sym

bols

are

ele

ctric

al re

pres

enta

tion

only

.5.

Solid

line

s in

side

PC

B ar

e pr

inte

d ci

rcui

t boa

rd c

ondu

ctor

s an

d ar

e no

t inc

lude

d in

lege

nd.

6.R

epla

ce o

nly

with

a 3

am

p fu

se.

7.In

duce

r (ID

M) a

nd b

low

er (B

LWM

) mot

ors

cont

ain

inte

rnal

aut

o-re

set t

herm

al o

verlo

ad s

witc

hes

(OL)

.8.

Neu

tral c

onne

ctio

ns a

re in

terc

hang

eabl

e w

ithin

the

NEU

TRAL

con

nect

or b

lock

.9.

Blow

er m

otor

spe

ed s

elec

tions

are

for a

vera

ge c

ondi

tions

, see

inst

alla

tion

inst

ruct

ions

for d

etai

ls o

nop

timum

spe

ed s

elec

tion.

10.

Fact

ory

conn

ecte

d w

hen

BVSS

(C

him

ney

Adap

ter A

cces

sory

Kit)

is n

ot in

stal

led.

11.

Fact

ory

conn

ecte

d w

hen

LGPS

is n

ot u

sed.

12.

Igni

tion-

lock

out w

ill oc

cur a

fter f

our c

onse

cutiv

e un

succ

essf

ul tr

ials

-for-i

gniti

on. C

ontro

l will

auto

-rese

taf

ter t

hree

hou

rs.

13.

Blow

er-o

n de

lay:

gas

hea

ting

25 s

econ

ds, c

oolin

g or

hea

t pum

p 2

seco

nds.

14.

Blow

er-o

ff de

lay:

gas

hea

ting

sele

ctio

ns a

re 9

0, 1

20, 1

50 o

r 180

sec

onds

, coo

ling

or h

eat p

ump

90 s

econ

ds o

r 5 s

econ

ds w

hen

DH

UM

is O

N.

15.

YELL

OW

lead

not

on

all m

otor

s.

FAN

BFANR

TRAN

FSE

LS1

RE

D

RE

D

BLU

RE

DW

HT

BLK

BLK

WH

T

IDM

HSI

WH

T

BLK

21P

L3

FRS

1

FRS2

BV

SS

DS

S

11

EAC

-1H

SIR

1 2P

L2

IDR

FUS

E O

R C

IRC

UIT

BR

EA

KE

R &

DIS

CO

NN

EC

T S

WIT

CH

(WH

EN

RE

Q’D

)N

OTE

#2

GR

N/Y

EL

GR

N/Y

EL

GN

D

NO

TE #

3

NO

TE #

6

WH

T

NO

TE #

5

GV

GR

N/Y

EL

RE

D

24V

NO

TE #

11

PR

S(W

HE

N U

SE

D)

LGP

S

YE

L

(WH

EN

US

ED

)

NO

TE #

10

L2

(WH

EN

US

ED

)

NEUTRAL

NO

TE #

11

GV

NEUTRAL

NOTE #8

BFA

NR

CO

NTI

NUO

US-

FAN

SEL

ECT

RELA

Y, S

PDT

BHT/

CLR

BLO

WER

MO

TOR

SPEE

D C

HA

NG

E RE

LAY,

SPD

TBL

WR

BLO

WER

MO

TOR

RELA

Y, S

PST-

(N.O

.)BL

WM

BLO

WER

MO

TOR,

PER

MA

NEN

T-SP

LIT-

CA

PAC

ITOR

BVSS

BLO

CKE

D V

ENT

SHUT

OFF

SW

ITCH

, MA

NU

AL-

RESE

T, SP

ST -(

N.C

.)C

AP

CA

PAC

ITOR

CPU

MIC

ROPR

OC

ESSO

R A

ND

CIR

CUI

TRY

DSS

DRA

FT S

AFE

GU

ARD

SW

ITC

H, A

UTO

-RES

ET, S

PST

-(N

.C.)

EAC

-1EL

ECTR

ON

IC A

IR C

LEA

NER

CO

NN

ECTIO

N (1

15 V

AC

1.0

AM

P M

AX.

)EA

C-2

ELEC

TRO

NIC

AIR

CLE

AN

ER C

ON

NEC

TION

(CO

MM

ON

)FR

S 1,

2FL

AM

E RO

LLO

UT S

W. -

MA

NU

AL

RESE

T, SP

ST-(

N.C

.)FS

EFL

AM

E-PR

OV

ING

ELE

CTR

OD

EFU

1FU

SE, 3

AM

P, A

UTO

MO

TIVE

BLA

DE

TYPE

, FA

CTO

RY IN

STA

LLED

FU 2

FUSE

OR

CIR

CUI

T BR

EAKE

R C

URRE

NT

INTE

RRUP

T D

EVIC

E(F

IELD

INST

ALL

ED &

SU

PPLI

ED)

GN

DEQ

UIPM

ENT

GRO

UND

GV

GA

S VA

LVE-

RED

UN

DA

NT

GV

R 1,

2G

AS

VALV

E RE

LAY,

DPS

T-(N

.O.)

HSI

HO

T SU

RFA

CE

IGN

ITER

(115

VA

C)

HSI

RH

OT

SURF

AC

E IG

NITE

R RE

LAY,

SPS

T-(N

.O.)

HU

M24

VAC

HUM

IDIF

IER

CO

NN

ECTI

ON

(0.5

AM

P. M

AX.

)ID

MIN

DUC

ED D

RAFT

MO

TOR,

SH

AD

ED-P

OLE

IDR

IND

UCED

DRA

FT M

OTO

R RE

LAY,

SPS

T-(N

.O.)

ILK

BLO

WER

AC

CES

S PA

NEL

INTE

RLO

CK

SWIT

CH

, SPS

T-(N

.O.)

J1BL

OW

ER -

OFF

DEL

AY J

UMPE

R SE

LEC

TOR

JBJU

NC

TIO

N B

OX

LED

LIG

HT-

EMITT

ING

DIO

DE

FOR

STA

TUS

CO

DES

- A

MBE

RLG

PSLO

W G

AS

PRES

SURE

SW

ITCH

, SPS

T-(N

.O.)

NEU

TRAL

BH

T/C

LRB

FAN

RB

LWR

CO

NN

ECTI

ON

DIA

GR

AM

CO

OL

HE

AT

PL1-

6

PL1-

2

PL1-

4

PL1-

10

PL1-

5

PL1-

8

TES

T/TW

IN

PCB

NO

TE #

5

BLW

PRINTED CIRCIUT BOARD


PL1-

3

PL1-

9PL

1-11

PL1

-7

NO

TE #

15

NO

TE #

15

LS2

(WH

EN

US

ED

)

LS2

(WH

EN

US

ED

)

RE

DR

ED

RE

D

RE

DO

RG

OR

G

A02140

Fig. 20 -- Wiring Diagram for Fixed--Capacity, Non--Condensing Furnaces

KGATW

23

GV

HIM

GR

N/Y

EL

CN

OTE

#3

BRN

BLU

BRN

GR

N/Y

EL

RED

RED

RED

NO

TE #

11FR

S1D

SS

BVS

S

LS1

(WH

EN U

SED

)

FRS2

NO

TE #

12

OR

NYE

L

HSI

L1N

OTE

#2

GN

D

NEU

TRAL

FU2

FUSE

OR

CIR

CUI

TBR

EAKE

R &

DIS

CO

NN

ECT

SWITC

H (W

HEN

REQ

'D)

BLK

ILK

PL5

JB

1 2

SEC-1

LEDSEC-2

FUSE 3-AMPPL

T

AC

RD

J

0.5 AMP@ 24 VAC

HUM

TEST/TWIN

ON

OFF

32

1

DLYOFFLHT

W/W

1D

HU

MG

24Vom

CW

2Y

/Y2

RY

1

TRAN

L1

PR-1

EAC-1

CA

P

OL

SPARE - 1

BLWR BHT/CLR BHI/LOR

COOL LO-HEAT

HI-HEAT

STA

RT

GR

N/Y

EL

BLW

M

NEUTRAL - L2 EAC-2R

ED

BLU

OR

NYE

LBL

K

LOM

ED L

OM

EDHI

MED

HI

RED

BLU

WH

TW

HT

BRN

BRN

BLK

WH

T

BLK

WH

T

IHI/L

OR

HSI

R

IDR

LO HI HSI

GR

Y

CO

NN

ECTI

ON

DIA

GR

AM

BLK

1H

SI

2

IDM

1 23

HI

CO

M LO

S

CH

EMAT

IC D

IAG

RAM

(NAT

UR

AL G

AS &

PR

OPA

NE)

IDR

T

O 1

15VA

C F

IELD

-DIS

CO

NN

ECT

SWIT

CH

EQU

IPM

ENT

GR

OU

ND

12 3H

SIR

IHI/L

OR

PL2

L2

L2

CAP

OL

STAR

T

BLW

M

CO

M

LOM

ED L

OM

ED HI

ME

D H

I

LO H

EAT

SPA

RE-

2C

OO

LIN

G

SPAR

E-1

BHI/L

OR

BHT/

CLR

BLW

R

EAC

-2EA

C-1

TRAN

L2

L2

115V

AC

24VA

CSE

C 2

SEC

1

PR

1

FU1

NO

TE #

6

FRS

1D

SS

BVSS

FRS

2

(WH

EN U

SED

)

PL1-

8G

VR

-2H

UM R

AC

RPL

1-12

HP

SR

GV

LPS

NO

TE #

12

LGP

S(W

HEN

USE

D)

HPS HI

PL1-

2

PL1-

4

PL1-

3

PL1-

10

PL1-

5

W/W

1

CP

U

GVR

-1

TEST

/TW

IN

DH

UM

W2

Y/Y2

G Y1 CO

M 2

4VN

OTE

#3 CM

PL1-

1

LPS

(WH

EN

US

ED

)LG

PS

WH

T

FSE

PL1-

9

PL1-

11

PL1-

7

LEG

EN

D

AC

RA

IR C

ON

DITI

ON

ING

REL

AY, S

PST

(N.O

.)A

CRD

JA

IR C

ON

DITI

ON

ING

REL

AY D

ISA

BLE

JUM

PER

BHI/L

OR

BLO

WER

MO

TOR

SPEE

D C

HA

NG

E RE

LAY,

SPD

TBH

T/C

LRBL

OW

ER M

OTO

R SP

EED

CH

AN

GE

RELA

Y, S

PDT

BLW

RBL

OW

ER M

OTO

R RE

LAY,

SPS

T-(N

.O.)

BLW

MBL

OW

ER M

OTO

R, P

ERM

AN

ENT-

SPLI

T-C

APA

CITO

RBV

SSBL

OC

KED

VEN

T SH

UTO

FF S

WITC

H, M

AN

UAL-

RESE

T, SP

ST -(

N.C

.)C

AP

CA

PAC

ITO

RC

PUM

ICRO

PRO

CES

SOR

AN

D C

IRC

UITR

YD

HUM

DH

UM C

ON

NEC

TION

D

SSD

RAFT

SA

FE G

UARD

SW

ITCH

, AUT

O-R

ESET

, SPS

T -(

N.C

.)EA

C-1

ELEC

TRO

NIC

AIR

CLE

AN

ER C

ON

NEC

TION

(115

VA

C 1

.0 A

MP

MA

X.)

EAC

-2EL

ECTR

ON

IC A

IR C

LEA

NER

CO

NN

ECTIO

N (C

OM

MO

N)

FRS

1, 2

FLA

ME

ROLL

OU

T SW

. -M

AN

UAL

RESE

T, SP

ST-(

N.C

.)FS

EFL

AM

E-PR

OV

ING

ELE

CTR

OD

EFU

1FU

SE, 3

AM

P, A

UTO

MO

TIVE

BLA

DE

TYPE

, FA

CTO

RY IN

STA

LLED

FU2

FU

SE O

R C

IRC

UIT

BREA

KER

CU

RREN

T IN

TERR

UPT

DEV

ICE

(FIE

LD S

UPPL

IED

AN

D IN

STA

LLED

)G

ND

EQU

IPM

ENT

GRO

UND

GV

GA

S VA

LVE-

RED

UND

AN

T G

VR

1, 2

GA

S VA

LVE

RELA

Y, D

PST-

(N.O

.)H

PSH

IGH

-HEA

T PR

ESSU

RE S

WITC

H, S

PST

(N.O

.)H

PSR

HIG

H-H

EAT

PRES

SURE

SW

ITCH

REL

AY, S

PST

(N.C

.)H

SIH

OT

SURF

AC

E IG

NIT

ER (1

15VA

C)

HSI

RH

OT

SURF

AC

E IG

NIT

ER R

ELAY

, SPS

T (N

.O.)

HUM

24VA

C H

UM

IDIF

IER

CO

NN

ECTIO

N (0

.5 A

MP.

MA

X.)

IDM

IND

UC

ED D

RAFT

MO

TOR,

SH

AD

ED-P

OLE

IDR

IND

UC

ED D

RAFT

MO

TOR

RELA

Y, S

PST-

(N.O

.)IH

I/LO

RIN

DU

CER

MO

TOR

SPEE

D C

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D)

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ILK

L1

A02159

Fig. 21 -- Wiring Diagram for Two--Stage, Non--Condensing Furnaces

KGATW

24

17 5/16″

24 1/2″

27 1/2″TYP

27 5/8″

29 5/8″TYP

30 13/16″TYP

32 5/8″TYP

33 1/4″TYP

CONDENSATE DRAINTRAP LOCATION

7/8-IN. DIAACCESSORYPOWER ENTRY

7/8-IN. DIAPOWER CONN

26 15/16″

24 1/2″22 1/4″

2-IN. COMBUSTION-AIR CONN

1/2-IN. GAS CONN

2-IN. VENT CONN

1/2-IN. DIA THERMOSTATENTRY

22 11/16″

SIDE INLET

23 1/4″

11/4″1" E

INLET

11/16″E

INLET

11/16″

F 13/16″13/16″

OUTLET

A

AIRFLOW

OUTLET

26 15/16″28 1/2″

26 1/4″

22 13/16″19″ 13/16″

5/8″

39 7/8″

11/16″24 3/16″BOTTOM INLET

18 1/4″

22 11/16″

2-IN. COMBUSTION-AIR CONN

1/2-IN. GAS CONN

7/8-IN. DIAPOWER CONN

1/2-IN. DIATHERMOSTAT ENTRY

2-IN. VENT CONN

14 1/2″ SIDE INLET

OUTLET

AIRFLOW

D D

9 3/8″TYP

26 15/16″ TYP

SIDE INLET

CONDENSATEDRAIN LOCATION(USED FOR LH FURNACES AFTERSERIAL NO. 2894A00001)

30 1/2″

CONDENSATEDRAIN LOCATION(USED FOR RH FURNACES AFTERSERIAL NO. 2894A00001)

CONDENSATE DRAIN TRAP LOCATION

(USED FOR RH FURNACES BEFORESERIAL NO. 2894A00001)

(USED FOR LH FURNACES BEFORE SERIAL NO.

2894A00001)

26 1/4 TYP

A93537

Fig. 22 -- Dimensional Drawing for Twinned Single--Speed Condensing Furnaces (Upflow, Downflow)

Table 3 – 58MCA, 58MCB, 58MSA, 58MTB, 58MXA, 58MXB, 58MTZ, 340AAV, 340MAV, 345MAV, 350AAV, 350MAV, 352AAV,352MAV, 490AAV, PG9MAA and PG9MAB

Single--Speed Condensing Furnace Dimensions -- In. (mm)INPUT HEATING SIZE

(BTUH) NOMINAL COOLING SIZE A D E F

60,000 48,000 35 (889) 15---7/8 (403) 16 (406) 33---3/8 (848)80,000* 48,000 35 (889) 15---7/8 (403) 16 (406) 33---3/8 (848)80,000 60,000 42 (1067) 19---3/8 (492) 19---1/2 (495) 40---3/8 (1026)100,000* 48,000 42 (1067) 19---3/8 (492) 19---1/2 (495) 40---3/8 (1026)100,000* 60,000 42 (1067) 19---3/8 (492) 19---1/2 (495) 40---3/8 (1026)120,000* 60,000 49 (1245) 22---7/8 (581) 23 (584) 47---3/8 (1203)

*Two---speed furnace capacities and dimensions

PROCEDURE 1 — INSTALL FURNACES

NOTE: Multipoise units can be installed in UPFLOW,DOWNFLOW, or HORIZONTAL configurations.

A. Upflow, Downflow, Side--By--Side ConfigurationRefer to Fig. 22 for appearance and dimensional drawing oftwinned furnaces and their connection locations.



a. Remove main and blower access doors.

b. Remove 2 screws from front filler panel.

c. Rotate front filler panel downward to remove.


e. Reinstall front filler panel.

3. Apply 2 factory--supplied foam strips to mating side of eachfurnace. Locate strips equal distance from top and bottom asshown in Fig. 25.

4. Return air connections




DO NOT use the back of the furnace for return--air ductconnections as limit cycling will occur.

! WARNING

b. For downflow applications: Return air can only be con-nected to bottom opening of furnace. A common returnair plenum is required for proper auxiliary limit switchoperation. (See Fig. 2.)

5. For upflow applications

a. Position furnaces against each other on return--air plen-um. Adjust and shim each furnace to align unused con-densate drain line holes in lower section of both fur-naces holes, which will be used for wire routingbetween furnaces. (See Fig. 31.)

b. Drill two 1/8--in. holes, approximately 1 in. (25 mm)be-low discharge air flange, from inside top of dischargeopening and through both furnaces. (See Fig. 26.)

c. Drive 1 factory--supplied No. 6 X 3/4--in. LG screwthrough each hole and tighten until furnaces are secureand foam strips have sealed gap between furnaces.

KGATW

25

A02234

Fig. 23 -- Back--to--Back (Upflow, Downflow or Horizontal)

Table 4 – Dimensions -- In. (mm)

INPUT HEATING SIZE(BTUH)

NOMINALCOOLINGSIZE

A D ETWINNED FURNACE

WEIGHTLBS (kg)

60,000 48,000 17–1/2 (445) 15---7/8(403) 16 (406) 350 (159)

80,000* 48,000 17–1/2 (445) 15---7/8(403) 16 (406) 410 (186)

80,000 60,000 21 (533) 19---3/8 (492) 19---1/2 (495) 228 (103)100,000* 48,000 21 (533) 19---3/8 (492) 19---1/2 (495) 458 (208)100,000* 60,000 21 (533) 19---3/8 (492) 19---1/2 (495) 464 (210)120,000* 60,000 24–1/2 (622) 22–7/8 (581) 23 (584) 522 (237)

*Two---Speed furnace capacities and dimensions

BOTTOMCLOSUREPANEL

FRONT FILLERPANEL

A93047

Fig. 24 -- Bottom Closure Panel

FOAMSTRIPS

UNUSED CONDENSATEDRAIN HOLE

FOR BACK-TO-BACKAPPLICATIONS, APPLYFOAM STRIPS AT THISHEIGHT, ALONG BACK OF FURNACE

A02236

Fig. 25 -- Location of Foam Strips and Hole to be used forTwinning Kit Wire Routing

KGATW

26

SCREW DISCHARGEOPENINGS TOGETHER

A93539

Fig. 26 -- Attaching Furnaces Together

6. For downflow applications:

a. Position furnaces on downflow kits (no A/C coils) or onentering air--side of A/C coils. Adjust and shim eachfurnace to align unused condensate drain line holes inlower section of both furnaces holes, which will be usedfor wire routing between furnaces. (Similar to Fig. 31.)

b. Drill two 1/8--in. holes, approximately 1 in. (25 mm)be-low return air flange, from inside top of return air open-ing and through both furnaces. (See Fig. 27.)


7. Insert 1 snap bushing through each adjoining unused con-densate drain line hole of each furnace.


9. 115--V junction boxes JB must be located on right side ofright--hand furnace and left side of left--hand furnace. Relo-cate as necessary. (See Fig. 31.)

10. Follow individual furnace installation instructions for up-flow/downflow applications. This includes, but not limitedto: condensate trap, condensate/inducer housing tubing,pressure switch tubing venting and electrical connections.



DO NOT use the back of the furnace for return--air ductconnections as limit cycling will occur.

! WARNING

B. Upflow/Downflow, Back--to--Back ConfigurationRefer to Fig. 23 and Table 4 for appearance and dimensionaldrawing of twinned furnaces and their connection locations.





A02219

Fig. 27 -- Attaching Furnaces Together -- Downflow




3. Apply 2 factory--supplied foam strips to mating back ofeach furnace. Locate strips equal distance from top and bot-tom as shown in Fig. 25. Trim off excess material.

4. Return Air Connections




DO NOT use the back of the furnace for return--air ductconnections in upflow position, as limit switch cycling willoccur.

! WARNING

b. For downflow applications: Return air can only be con-nected to bottom opening of furnace. A common returnair plenum is required for proper auxiliary limit switchoperation. (See Fig. 2.)

5. For upflow applications

a. Position furnaces against each other on return--air plen-um. (See Fig. 23.)

b. Drill two 1/8--in. holes, approximately 1 in. (25 mm)be-low discharge air flange, from inside top of dischargeopening and through both furnaces. (See Fig. 27.)


6. For downflow applications

a. Position furnaces on downflow kits or plenum (no A/Ccoils) or on entering air--side of A/C coils. (See Fig. 23.)

b. Drill two 1/8--in. holes, approximately 1 in. (25 mm)be-low return air flange, from inside top of return air open-ing and through both furnaces. (See Fig. 27.)

KGATW

27

COMBUSTION – AIRINTAKE

VENT

MANUALSHUTOFF

GAS VALVE

SEDIMENTTRAP

CONDENSATETRAP

ACCESS OPENINGFOR TRAP

30 IN. (762 MM) MIN WORK AREA

A 12 IN. (305 MM) MIN HORIZONTAL PIPESECTION IS RECOMMENDED WITHSHORT (5 TO 8 FT / 1.5 TO 2.4 M) VENT SYSTEMS TO REDUCE EXCESSIVECONDENSATE DROPLETS FROMEXITING THE VENT PIPE.

5-3/4 IN. (146 MM)

COMMON RETURN

30 (762 MM) MINWORK AREA

EXTERNAL EXTENSIONTWINNING HARNESS

A02209

Fig. 28 -- Attic Installation on a Platform


7. Determine which side of furnace will be used to route ex-ternal extension harness. If condensate drain hole is avail-able, use it, otherwise, drill two 7/8--in holes in blowerhousing area, mid--point between blower deck and bottomof furnace.

NOTE: The external extension harness cannot be used on thesame side of the furnace that the return air ducts connect to. Locateharness on opposite side of furnace where return air is used.

8. Connect return and supply--air ducts to furnaces. Seal ductconnections to prevent air leakage.

9. Follow individual furnace installation instructions for up-flow/downflow applications. This includes, but not limitedto: condensate trap, condensate/inducer housing tubing,pressure switch tubing venting and electrical connections.

C. Horizontal, Back--to--Back ConfigurationWhen twinning furnaces in the horizontal position, considerationmust be made to the type of building construction. Attic floorsshould be constructed to support normal live and dead loads of thefurnaces and the person(s) servicing them. Trusses, wood andmetal are engineered for specific applications, and may not supportthe weight of two (2) furnaces suspended from the top chords orthe bottom chords of the trusses. Long horizontals spans may flexor sag, resulting in damage to the building. Contact the trussmanufacturer for additional design and engineering assistance.


For attic installations on a platform:

1. Construct a platform from 3/4--in. (nominal plywood), ex-tending out 30 inches (762 mm) from the front of each fur-nace. (See Fig. 28.)





For suspended installations (Not recommended for wood trusses)(See Fig. 29.):

1. Furnaces may be suspended using two (2) pieces of1--1/2--in. x 1--1/2--in. x 1/4--in. thick cold rolled angle ironunderneath each furnace and four (4) 3/8--in. diameterthreaded rods.


3. Each piece of angle iron must be secured to the bottom ofeach furnace with at least two (2) #8 x �� sheet metalscrews.











KGATW

28

3/8" ROD, HEX NUT& WASHER

(B)(A)

(A)(B)

(B)

(A) ROD LOCATION USING� DIMPLE LOCATORS� ( SEE DIMENSIONAL DWG� FOR LOCATIONS)

(B)(A)

(A) PREFERRED ROD LOCATION�(B) ALTERNATE ROD LOCATION

11/2" ANGLE�OR EQUIVALENT

(B)(B)(A)

3/8" NUT, BOLT�& WASHERS

(A)(B)

USING (B) LOCATIONS�13/16" MAX FROM BACK �OF FURNACE

DRAIN

53/4"

USING (B) LOCATIONS�4" TO 8" MAX

3/8" ROD, HEX NUT& WASHER

(B)(A)

(A)(B)

(B)

(A) ROD LOCATION USING� DIMPLE LOCATORS� ( SEE DIMENSIONAL DWG� FOR LOCATIONS)

(B)(A)

(A) PREFERRED ROD LOCATION�(B) ALTERNATE ROD LOCATION

11/2" ANGLE�OR EQUIVALENT

(B)(B)(A)

3/8" NUT, BOLT�& WASHERS

(A)(B)

USING (B) LOCATIONS�13/16" MAX FROM BACK �OF FURNACE

DRAIN

53/4"

USING (B) LOCATIONS�4" TO 8" MAX

A02208

Fig. 29 -- Suspended Installation of Furnaces

3. Apply 2 factory--supplied foam strips to mating back ofeach furnace. Locate strips equal distance from top and bot-tom as shown in Fig. 25. Trim off excess material.

4. Securing furnaces together:

a. Lay furnaces back--to--back on a flat surface.

b. Similar to side--by--side installations (See Fig. 26.), drilltwo 1/8--in. holes, approximately 1 in. (25 mm)belowdischarge air flange, from inside top of discharge open-ing and through both furnaces. Also drill two 1/8--in.holes, approximately 1 in. (25 mm)below return airflange, from inside top of return air opening andthrough both furnaces.


5. With furnaces laying in their side and back--to--back, de-termine which side will now be the top side to route extern-al extension harness. Use the unused condensate drain holesin blower housing area.


7. Follow individual furnace installation instructions for hori-zontal applications. This includes, but not limited to: con-densate trap, condensate/inducer housing tubing, pressureswitch tubing venting and electrical connections.

PROCEDURE 2 — CONNECT ELECTRICALCOMPONENTS—HEATING

FIRE HAZARD



! WARNING


NOTE: To determine referencing of Left Hand (LH) and RightHand (RH) furnace:

a. In the Side--by--Side, upflow and downflow applica-tions, reference the furnaces from the front, as youwould see them in the upflow application (See Fig. 31.)The LH furnace is the main furnace and the RH furnaceis the secondary furnace.

b. In the Back--to--Back, upflow, downflow and horizontalapplications, reference the furnaces from the side of theexternal extension harness. The LH furnace is the mainfurnace and the RH furnace is the secondary furnace, asyou would see them in the upflow application (See Fig.32.)

There are 3 harnesses included in this kit. If the furnaces areside--by--side, only 2 harnesses are required. If the furnaces areinstalled back--to--back, all 3 harnesses included in the kit must beused.


KGATW

29

A02226

Fig. 30 -- Twinning Kit Relay Mounted on Control MountingBracket for LH Furnace

2. If furnaces are installed back--to--back in any orientation, theExternal Extension Harness must be used. The harness con-sists of:

a. 54--1/2 inches (1384 mm) of 1/2--in. flexible steel con-duit


c. (3) 4 wire polarized wiring harness

d. (3) 2 wire polarized wiring harness

Install the harness as follows:


b. Route the end of the harness that mates to the TKR re-lay harness of the LH furnace through the unused con-densate trap hole in the casing of the blower compart-ment.

c. Route the end of the harness that mates to the 4--wireharness of the RH furnace through the unused condens-ate trap hole in the casing of the blower compartment.


e. Install the two kit--supplied straps approximately 18inches (457 mm) from each end of extension harness.

3. Fixed Capacity Furnace/Single--Stage Heat with Single--Stage Gas--Heat Thermostat (Field Supplied) OR Two--Stage Furnace with Single or Two--Stage Gas--Heat Ther-mostat (Field--Supplied)

NOTE: This application of TKR allows both furnaces to operateas 1 furnace gas heat mode as determined by an individualthermostat. Install twinning kit relay (TKR):

a. Mount TKR assembly to underside of LH furnace con-trol enclosure using 1 No. 6 sheet metal screw (factorysupplied). Screw hole is located to left of door switchnear front edge of control. (See Fig. 30.)

NOTE: See Fig. 15 or 17 for twinning kit wiring.

b. Route 3 loose wires (black, yellow, and white) fromTKR assembly wire harness through T--STAT/HUMhole adjacent to door switch. (See Fig. 30.)

c. Connect TKR white wire labeled W from TKR to LHfurnace control thermostat connection W or W/W1.

d. Connect TKR black wire labeled C from TKR to LHfurnace control thermostat connection COM 24V.

e. Connect yellow wire labeled TEST to LH furnace con-trol TEST/TWIN terminal.

f. Route female four--pin connector end of TKR wires:

(1.) For Side--by--Side applications, see Fig. 22 and31. Route female, four--pin connector through pre-viously installed bushings in unused condensatedrain holes, located on casing in blower compart-ment area. Connect to male four--pin connector ofRH furnace.

(2.) For Back--to--Back applications, see Fig. 23 and32. Connect the female, four pin connector to themale four pin connector of the previously installedExternal Extension Kit. Connect the female fourpin connector of the External Extension Kit to themale four pin connector of the RH furnace.

g. Route four wires through thermostat cable hole of RHfurnace control box.

h. Connect TKR red wire labeled R--SECONDARY fromTKR to RH furnace control thermostat connection R.

i. Connect TKR white wire labeled W--SECONDARYfrom TKR to RH furnace control thermostat connectionW or W/W1.

j. Connect TKR black wire labeled C--SECONDARYfrom TKR to RH furnace control thermostat connectionCOM 24V.

k. Connect yellow wire labeled TEST SECONDARY fromLH furnace control TEST/TWIN terminal to RH furnacecontrol TEST/TWIN terminal.

l. For Two--Stage Furnace Control Boards–In additionto the wiring of the twinning kit, the LHT switch and asingle OR two--stage gas--heat thermostat must be con-figured to one of the two methods describe below:Two--Stage Heat with Single--Stage Gas--Heat Ther-mostat (allows the LH or Main Furnace’s algorithmcontrol low and high--heat operation)(1.) Position LHT switch on Main or LH furnace con-

trol to OFF.

(2.) Position LHT switch on Secondary or RH furnacecontrol to ON.Two--Stage Heat with Two--Stage Gas--HeatThermostat (allows a two--stage thermostat tocontrol low and high--heat operation)Position LHT switch furnace controls in BOTHfurnaces to ON

m. Proceed to #5 “Install LH furnace auxiliary limit switchharness ALS--M” to complete electrical connections.

KGATW

30

AUXILIARY LIMITDOOR SWITCH(ILK-I)

POWER JUNCTION BOXRELOCATED HERE

SECONDARY AUXILIARYLIMIT SWITCH (ALS-S)

MAIN 24-VTRANSFORMER

MAIN BLOWER ACCESSPANEL DOOR SWITCH

SECONDARY 24-VTRANSFORMER

MAIN AUXILIARYLIMIT SWITCH

(ALS-M)

8″ TYP

TWINNING KITRELAY (TKR)

SECONDARY BLOWER ACCESSPANEL DOOR SWITCH

UNUSED CONDENSATEDRAIN LINE HOLESWITH SNAPBUSHING INSTALLED

A01377

Fig. 31 -- Twinning Kit Installed on Single--Speed and 2--Stage Condensing Furnaces (After Serial No. 2894A00001)Single--Speed Shown

Unused condensatedrain location

External Extension

A02225

Fig. 32 -- External Extension Harness(Back--to--Back Application)

4. Two--Stage Heating using Fixed--Capacity Furnaces withTwo--Stage Gas Heat Thermostat (Field Supplied). See Fig.16.

NOTE: This modification allows LH furnace only to operate inheating mode for first--stage heat or both furnaces to operate inheating mode for second--stage heat as determined by a 2--stagethermostat. See furnace Installation, Start--Up, and OperatingInstructions for further details on this heating mode.

To operate furnaces in 2--stage heating mode when a 2--stagethermostat controls the staging, install twinning kit as describedabove, then modify TKR wiring as follows:

PERSONAL INJURY HAZARD

Failure to follow this caution may result in intermittent furnaceoperation and unit damage.

Supply--air temperature will be uneven left--to--right whenonly main system is operating.

CAUTION!

KGATW

31

A02237

Fig. 33 -- LHT Switches

NOTE: See Fig. 16.

a. Disconnect TKR white wire labeled W from LH furnacecontrol thermostat connection W.

b. Cut terminal off TKR white wire labeled W and strip1/4 in. (6 mm).

c. Connect 2--stage thermostat W2 connection to TKRwhite wire labeled W.

NOTE: ALL other 2--stage thermostat connections are to be madeto LH furnace control center ONLY.

d. Proceed to #5 “Install LH furnace Auxiliary LimitSwitch -- Main ALS--M” harness to complete electricalconnections.

5. Install LH furnace (main) auxiliary limit switch harnessALS--M.

NOTE: LH furnace ALS--M assembly DOES NOT include doorswitch.

a. Drill 1/8--in. hole in blower housing 8 in. below blowershelf as shown in Fig. 31.


c. Secure bracket to blower housing using factory--sup-plied No. 6 X 3/4--in. LG screw.

d. Disconnect red transformer wire from SEC--1 connec-tion.

e. Connect removed red transformer wire to ALS--M wireconnector labeled TRAN. Route through thermostatholes of control box.

f. Connect ALS--M connector labeled SEC 1 to LH fur-nace control SEC--1 terminal.

g. Route 2--wire ALS--M connector from LH furnace toRH furnace through unused condensate drain line holewith snap bushing.

6. Install RH furnace (SECONDARY) auxiliary door switchand harness (ALS--S/ILK--1).

NOTE: RH furnace ALS--S assembly HAS door switch included.

a. Install auxiliary limit switch (ALS--S).

(1.) Drill 1/8--in. hole in blower housing 8 in. belowblower shelf as shown in Fig. 25.

(2.) Position ALS--S so terminals face front of furnace.

(3.) Secure bracket to blower housing using factory--supplied No. 6 X 3/4--in. LG screw.

b. Install auxiliary door switch (ILK--1).

(1.) Drill 7/32--in. hole in left side of RH furnaceblower shelf for mounting door switch as shown inFig. 31.

(2.) Secure ALS--S door switch (ILK--1) using factory--supplied flat screw No. 6 X 3/4--in. LG screw.

c. Connect RH furnace 2--wire ALS--S connector PL6 toLH furnace 2--wire ALS--M connector PL6 that wasrouted through furnace casings.

7. Select identical blower speed taps at blower motor connec-tions on control center in both furnaces.

UNIT DAMAGE HAZARD

Failure to follow this caution could result in unit damage.

Failure to select identical blower speed taps in both furnacescan result in overheating of furnace components and possibleloss of furnace operation and damage to the furnace.

CAUTION!

8. Dress wires to ensure they do not contact sharp edges ormoving parts, nor interfere with blower operation, removalof filters, or operation of switches.

9. Make all thermostat connections to the LH furnace only.

PROCEDURE 3 — CONNECT ELECTRICALCOMPONENTS—COOLING




! WARNING

When installing twinned outdoor units with twinned gas furnaces,it is necessary to use a field--supplied 24--vac pilot--duty relay and afield--supplied 24/115--vac transformer as shown in Fig. 15, 16, or17 to prevent overloading furnace 24/115--vac transformer.

KGATW

32

A

A96128

Fig. 34 -- Rooftop Termination (Dimension “A” is Touching or2 in. (51 mm) Maximum Separation)

PROCEDURE 4 — VENTING

Refer to Installation, Start--Up, and Operating Instructions suppliedwith each furnace for venting information. Each furnace mustalways be individually vented. Do not common--vent orbreach--vent condensing furnaces. For direct--vent installations,refer to Fig. 34, 35, 36, 37, or 38 for proper termination. It isimportant that vent terminations be made as shown to avoidrecirculation of flue gases.

PROCEDURE 5 — GAS SUPPLY PIPING

NOTE: All gas connections must be made through exposed outerside of each furnace. Do not common connect any connectionother than supplyand return--air ducts.

Furnaces are recommended to be provided with a single shutoffvalve. However, individual shutoff valves may be required by localcodes or jurisdictions. Refer to Installation, Start--Up, andOperating Instructions provided with each furnace for additionalgas supply information.

PROCEDURE 6 — CONDENSATE DRAINCONNECTIONS

The condensate trap is factory installed in blower shelf and factoryconnected for UPFLOW applications. Install condensate trapextension drain such that field drain connections are on the left sidefor LH (MAIN) furnace and on right side for RH (SECONDARY)furnace. (See Fig. 28.)

The condensate trap must be relocated for downflow andhorizontal applications.

See furnace Installation, Start--Up, and Operating Instructions fordetails on attaching field drain for downflow and horizontalapplications.

PROCEDURE 7 — ELECTRICAL SUPPLYCONNECTIONS

NOTE: All electrical power connections must be made throughexposed outer side of each furnace. Do not common connect anyconnection other than supply-- and return--air ducts.

1. Each furnace shall be connected to its own 115--vac powersupply. The twinning kit installation interconnects the fur-naces, allowing them to operate as a single furnace. The L1(black) connection to each furnace must be connected to cir-cuit breakers connected to the same service panel 115--vacphase leg.On single--phase (residential) systems, each furnace circuitbreaker should be located directly across from each other in

service panel, or each furnace circuit breaker should be loc-ated on the same side of service panel, but must skip 1 spaceto be connected to the same leg of the 1--phase power sup-ply.On 3--phase (commercial) systems, each furnace circuitbreaker should be located directly across from each other inservice panel, or each furnace circuit breaker should be loc-ated on the same side of service panel, but must skip 2spaces to be connected to the same leg of the 3--phasepower supply.The proper 115--vac phasing of furnace connections permits24--vac transformer phasing as described below.

2. Phasing of the connected 24--vac transformer secondary cir-cuits can be determined with the LED status of both fur-naces. See furnace Installation, Start--Up, and Operating In-structions and status code label on blower access panel ormain furnace door. The furnaces’ transformers’ black leadsshould be connected to PR1 connectors and white leads toPR2 connectors on controls. If 1 or both LEDs are rapidlyflashing, disconnect lead at TEST/TWIN terminal of LHfurnace and observe LED at each furnace.IF:

a. Both LEDs are on continuously:System phasing is okay.

b. One or both LEDs are rapidly flashing:

(1.) Line voltage polarity is reversed.

(2.) Reverse SEC--1 and SEC--2 in furnace with rapidflashing LED.

c. One LED is off, 1 LED is on continuously:

(1.) The 24--vac circuit is inoperative on furnace withLED light off.

(2.) Check transformers, auxiliary limits, and doorswitches in both furnaces and correct problem.

3. Reconnect lead at TWIN/TEST terminal of LH furnace andobserve LED at each furnace. The LEDs will glow steadyfor proper phasing.

PROCEDURE 8 — START--UP ANDADJUSTMENT

NOTE: Refer to Installation, Start--Up, and Operating Instructionssupplied with furnace for detailed information.

1. Shut off all power and gas to both furnaces.

COMBUSTIONAIR

VENTVENT

A

A93056

Fig. 35 -- Concentric Vent and Combustion Air Roof Termina-tion (Dimension “A” is Touching or 2 in. (51 mm) Maximum

Separation)

KGATW

33

COMBUSTION AIR

VENT

A

VENT

1″ (25 mm) MAXIMUM(TYP)

A93057

Fig. 36 -- Concentric Vent and Combustion Air SideTermination (Dimension “A” is Touching or 2 in. (51 mm)

Maximum Separation)

A

COMBUSTION AIR

COMBUSTION AIR

VENT

A96129

Fig. 37 -- Sidewall Termination of 12 in. (305 mm)or Less(Dimension “A” is Touching or 2 in. (51 mm)

Maximum Separation)

2. Position blower off delay switches on controls in BOTHfurnaces to the SAME desired blower off delay in heating.See furnace Installation, Start--Up, and Operating Instruc-tion for further details.

3. Attach twinning connection wiring label above the existingfurnace wiring label on the inside of the L/H furnace bloweraccess door. Use the following labels for the following ap-plications:Single--Stage furnaces with single--stage thermostat,327893–101Single Stage furnaces with two--stage thermostat,327892–101Two--Stage furnaces with single--stage or 2–stage thermo-stat, 327891–101

4. Attach twinning reference label 327956--101 on the outsideof blower access door of RH furnace

5. Manually close the blower switch.

COMBUSTION AIRCOMBUSTION AIR

VENT

A

A96130

Fig. 38 -- Sidewall Termination of More Than 12 in.(305 mm) (Dimension “A” is Touching or 2 in. (51 mm)

Maximum Separation)

6. Turn on power and gas to furnaces.

7. Using appropriate section below, operate furnaces through 2cycles in each mode to confirm correct operation by operat-ing only the thermostat.

a. Single-- or 2--stage gas heating thermostat R--to--W/W1for low--gas heat. Single--stage thermostat with adaptiveheating mode causes furnace to operate in low--gas--heatmode for up to 16 minutes, and then furnace automatic-ally switches to high--gas heat. First stage of a 2--stagethermostat without adaptive heating mode causes fur-nace to operate in low--gas--heat mode indefinitely.

b. First and second--stage of 2--stage heating thermostatR--to--W/W1--and--W2 for high--gas--heat.

c. Thermostat R--to--G for continuous fan or 2--stage cool-ing low--cool blower.

d. Cooling thermostat R--to--G--and--Y/Y2 for single--speedcooling blower or for 2--stage cooling high--cool blower.

8. Reinstall control doors on both furnaces.

9. Instruct user in operation of furnaces and thermostat.

PROCEDURE 9 — SEQUENCE OFOPERATION

See Fig. 15, 16, or 17, and 39 or 40 for condensing furnacetwinning connection and schematic wiring diagrams whilereviewing sequence of operation.

Twinning operation is controlled by LH or MAIN furnace. TheTEST/TWIN connection wire ensures the 2 furnaces coordinatetheir blower operation. When either furnace requires bloweroperation, both furnace blowers operate at same speed. Bothfurnaces operate simultaneously in the same mode: heat, cool, orcontinuous fan. Exceptions can occur if a safety switch on eitherfurnace is opened by a problem (such as pressure switch, flameroll--out switch, main limit switch, twinning kit auxiliary limitswitch, or flame--proving sensor). In such a case, the other furnacecontinues to operate unless open switch is the flame roll--out, mainlimit, or twinning kit auxiliary limit switch, in which case bothfurnaces respond.

Before performing component test, disconnect TKR yellow wirelabeled TEST from LH furnace control center TEST/TWINterminal. After removing yellow wire, component test can beinitiated on each furnace individually as stated in Installation,Start--Up, and Operating Instructions.

KGATW

34

A. Fixed Capacity FurnacesSINGLE--STAGE HEAT, SINGLE STAGE FURNACESWITH SINGLE--STAGE GAS--HEAT THERMOSTATOperation in all modes (sequence of operation) is the same fortwinned furnaces as for an individual furnace. See furnaceInstallation, Start--Up, and Operating Instructions for moreinformation on the sequence of operation.

TWO--STAGE HEAT, SINGLE STAGE FURNACES WITH2--STAGE GAS--HEAT THERMOSTAT

1. The two--stage thermostat determines if furnaces are operat-ing in first--stage heat (LH furnace operates in heat whileRH furnace blower operates but RH furnace is not heating)or if furnaces are operating in second--stage heat (both fur-naces operate in heat), depending on how many thermostatstages are calling for heat. If two--stage cooling is used, Y1from the thermostat will initiate both furnace blowers to thecooling speed and the first A/C unit. Y2 from the thermostatwill go directly to the outdoor unit and initiate the secondA/C unit.

2. Operation in all modes (sequence of operation) is the samefor twinned furnaces as for an individual furnace. See fur-nace Installation, Start--Up, and Operating Instructions formore information on sequence of operation.

TWO--STAGE HEAT, TWO STAGE FURNACES WITHSINGLE--STAGE GAS--HEAT THERMOSTATNOTE: See Section 2, Procedure 2 -- Electrical Connections, Step3 for control board wiring and LHT switch setup.

1. LH furnace control determines whether furnaces are bothoperating in low--gas heat or high--gas heat, depending onthe control’s adaptive gas heating mode when the R--to--W/W1 circuit is closed in LH furnace.


TWO--STAGE HEAT, TWO STAGE FURNACES WITH2--STAGE GAS--HEAT THERMOSTATNOTE: See Section 2, Procedure 2 -- Electrical Connections, Step3 for control board wiring and LHT switch setup.

1. The 2--stage thermostat (NOT furnace control’s adaptive gasheating mode) determines whether furnaces are both operat-ing in low--gas heat or high--gas heat, depending on whether1 or both thermostat stages (W/W1 or W/W1--and--W2) arecalling for heat.


KGATW

35

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Fig. 39 -- Fixed--Capacity Condensing Furnace Wiring Diagram

KGATW

36

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L2

PL4

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WH

T

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T

RED BLK

PL2

IDM

NOTE #8

1 AMP @ 115 VAC

STA

TUS

CO

DE

FU1NOTE #6

PL1

1

SELE

CT

CH

ART

SWLO

-HT

ON

LYB

LOW

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FF-D

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OFF

1

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EAT

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*

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SPARE-2

FSE

RED

ACRDJ

3267

97-1

01 R

EV. A

1.If

any

of th

e or

igin

al e

quip

men

t wire

is re

plac

ed u

se w

ire ra

ted

for 1

05∞C

.2.

Use

onl

y co

pper

wire

bet

wee

n th

e di

scon

nect

sw

itch

and

the

furn

ace

junc

tion

box

(JB

).3.

This

wire

mus

t be

conn

ecte

d to

furn

ace

shee

t met

al fo

r con

trol

to p

rove

flam

e.4.

Sym

bols

are

ele

ctric

al re

pres

enta

tion

only

.5.

Solid

line

s in

side

PC

B a

re p

rinte

d ci

rcui

t boa

rd c

ondu

ctor

s an

d ar

e no

t inc

lude

d in

the

lege

nd.

6.R

epla

ce o

nly

with

a 3

am

p fu

se.

7.B

low

er m

otor

(BLW

M) a

nd in

duce

r mot

or (I

DM

) con

tain

inte

rnal

aut

o-re

set t

herm

al o

verlo

ad s

witc

hes

(OL)

.8.

Neu

tral

con

nect

ions

are

inte

rcha

ngea

ble

with

in th

e N

EUTR

AL

conn

ecto

r blo

ck.

9.B

low

er m

otor

spe

ed s

elec

tions

are

for a

vera

ge c

ondi

tions

, see

inst

alla

tion

inst

ruct

ions

for o

ptim

um s

elec

tion.

10.M

ED n

ot a

vaila

ble

on s

ome

mod

els.

11.F

acto

ry c

onne

cted

whe

n LG

PS is

not

use

d.12

.Ign

ition

lock

out w

ill o

ccur

afte

r fou

r con

secu

tive

unsu

cces

sful

tria

ls-fo

r-ig

nitio

n. C

ontr

ol w

ill a

uto-

rese

t afte

rth

ree

hour

s.13

.Blo

wer

-on

dela

y: g

as h

igh-

heat

60

seco

nds,

gas

low

-hea

t 45

seco

nds,

coo

ling

or h

eat p

ump

2 se

cond

s.14

.Blo

wer

off-

dela

y: g

as h

eatin

g se

lect

ions

are

90,

120

, 150

, 180

sec

onds

, coo

ling

or h

eat p

ump

90 s

econ

ds o

r 5

seco

nds

whe

n de

hum

idify

cal

l is

activ

e.

NO

TE

S:



FRS

LS

WHT

WHT

PL3

IDM

12

3

BLK

4

GRN/YEL

CAP

-2B

RN

BRN

GR

N

RED

WHT

OL

/YEL

CA

P-1

NO

TE #

2

OL

4

CAP-2

NO

TE #

9

A02255

Fig. 40 -- Two--Stage Condensing Furnace Wiring Diagram

KGATW

37

Table 5 – Single--Stage Heating with Single--Stage Thermostat Using Two Single--Stage FurnacesTHERMOSTAT CONNECTIONS CONTROL BOARD CONNECTION ACTION

R R Power from control board to thermostatW W Starts L/H and R/H furnaces for heating

Table 6 – Single--Stage Cooling with Single--Stage Thermostat Using Two Single--Stage A/C UnitsTHERMOSTAT CONNECTIONS CONTROL BOARD CONNECTION ACTION

R R Power from control board to thermostatY Y/Y2 (Y on standard control board) Energizes accessory cooling relay(s) to start L/H and R/H A/C for

coolingG G Starts both indoor fans on cooling speed (With Y/Y2 energized)

Dehum* Dehum* Reduces airflow in cooling mode from cooling speed to heatingspeed when Dehum input is removed

*Dehum is not available on all thermostats or control boards

Table 7 – Two--Stage Heating with Two--Stage Thermostat Using Two Single--Stage FurnacesTHERMOSTAT CONNECTIONS CONTROL BOARD CONNECTION ACTION

R R Power from control board to thermostatW1 W Starts L/H furnace for first stage heatingW2 None Thermostat W2 wired directly to R/H accessory relay to start

R/H Furnace for second stage heating

Table 8 – Two--Stage Cooling with Two--Stage Thermostat Using Two Single--Stage A/C UnitsTHERMOSTAT CONNECTIONS CONTROL BOARD CONNECTION ACTION

R R Power from control board to thermostatY1 Y/Y2 (Y on standard control board) Energizes accessory cooling relay to start L/H and A/C for first

stage cooling and cooling speed blowerY2 None Thermostat Y2 wired directly to R/H accessory relay to start R/H

A/CG G Starts both indoor fans on cooling speed (With Y/Y2 energized)

Dehum* Dehum* Reduces airflow in cooling mode from cooling speed to heatingspeed when Dehum input is removed

*Dehum is not available on all thermostats or control boards

Table 9 – Continuous Fan OperationTHERMOSTAT CONNECTIONS CONTROL BOARD CONNECTION ACTION

R R Power from control board to thermostatG G Starts both fans in heating speed*

*Staged continuous Fan operation is not available

Table 10 – Two--Stage Heating with Single--Stage Thermostat Using 2 Two--Stage FurnacesTHERMOSTAT CONNECTIONS CONTROL BOARD CONNECTION ACTION

R R Power from control board to thermostatW W/W1 Starts L/H and R/H furnaces in low heat or high heat, as deter--

mined by L/H furnace control board**LHT switches must be in correct configuration

Table 11 – Two--Stage Heating with Two--Stage Thermostat Using 2 Two--Stage FurnacesTHERMOSTAT CONNECTIONS CONTROL BOARD CONNECTION ACTION

R R Power from control board to thermostatW1 W/W1 Starts both furnaces in low heat for first stage heating*W2 W2 Starts both furnaces in high heat for second stage heating*

*LHT switches must be in correct configuration

Table 12 – Single--Stage Cooling with Single--Stage Thermostat Using 2 Single--Stage A/C UnitsTHERMOSTAT CONNECTIONS CONTROL BOARD CONNECTION ACTION

R R Power from control board to thermostatY Y/Y2 Energizes accessory cooling relay to start both A/C units for

coolingG G Starts both indoor fans on cooling speed (With Y/Y2 energized)

Dehum* Dehum** Reduces airflow in cooling mode from cooling speed to heatingspeed when Dehum input is removed

*Do not remove ACRDJ from furnace control boards** Dehum is not available on all thermostats or control boards

KGATW

38

Table 13 – Two--Stage Cooling with Two--Stage Thermostat Using 2 Single--Stage A/C UnitsTHERMOSTAT CONNECTIONS CONTROL BOARD CONNECTION ACTION

R R Power from control board to thermostatY1 Y/Y2 Energizes accessory cooling relay to start L/H A/C for first stage

coolingY2 None Thermostat Y2 wired directly to R/H accessory relay to start R/H

A/CG G Starts both indoor fans on heating speed until Y/Y2 is energized

Dehum* Dehum** Reduces airflow in cooling mode from cooling speed to heatingspeed when Dehum input is removed

*Do not remove ACRDJ from furnace control boards** Dehum is not available on all thermostats or control boards

Table 14 – Continuous Fan OperationTHERMOSTAT CONNECTIONS CONTROL BOARD CONNECTION ACTION

R R Power from control board to thermostatG G Starts both fans in heating speed*

*Staged Continuous Fan operation is not available

Copyright 2010 CAC / BDP D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 06/10

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Catalog No: AG---GATW---16

Replaces: AG---GATW---15

KGATW

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