l8148a,e,j aquastat relayss3.supplyhouse.com/manuals/1287574876485/40752_prod_file.pdf · type 120...

PRODUCT DATA

60-2278-9® U.S. Registered TrademarkCopyright © 2001 Honeywell • All Rights Reserved

L8148A,E,JAquastat® Relays

APPLICATIONThe L8148 Aquastat® Relays are immersion type hydronic controllers that combine high limit protection with switching relay control of burner and circulator motors.

FEATURES• All models are used with a 24 Vac thermostat.• Models include special terminals for adding remote,

low limit temperature control.• L8148E,J have terminals for adding zone valve system

wiring.• L8148E models are available with plug for connecting

Aquastat¨ Relay directly to D892/M892 Vent Dampers.• All devices include transformer to provide power for

the low voltage control circuit. Different models provide switching of line, low, or millivoltage burner circuit.

• Case available for horizontal or vertical mounting.• Combinations of two insulation and two insertion well

lengths are available.

HorizontalMounting

VerticalMounting

ContentsApplication ........................................................................ 1Features ........................................................................... 1Specifications ................................................................... 2Ordering Information ........................................................ 2Installation ........................................................................ 4Setting and Adjustments .................................................. 12Operation .......................................................................... 12Checkout .......................................................................... 12

L8148A,E,J AQUASTAT® RELAYS

60-2278—9 2

ORDERING INFORMATIONWhen purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number.

If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:

1. Your local Home and Building Control Sales Office (check white pages of your phone directory).2. Home and Building Control Customer Relations

Honeywell, 1885 Douglas Drive NorthMinneapolis, Minnesota 55422-4386

In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

SPECIFICATIONSIMPORTANT

The specifications given in this publication do not include normal manufacturing tolerances. Therefore, this unit may not exactly match the listed specifications. Also, this product is tested and calibrated under closely controlled conditions, and some minor differences in performance can be expected if those conditions are changed.

TRADELINE® ModelsTRADELINE® models are selected and packaged for ease of handling, ease of stocking, and maximum replacement value. TRADELINE® model specifications are the same as those of standard models except as noted below.

TRADELINE® Models Available:• L8148A Aquastat¨ Relay, without zone control terminals,

without well and spud. See Fig. 2.• L8148E Aquastat¨ Relay with Molex® plug for use with

D892/M892 Vent Dampers; 180°F to 240°F (82°C to 116°C) scale range; without well and spud.

• L8148J Aquastat¨ Relay with zone control terminals; without well and spud. See Fig. 3.

Scale Range: 140°F to 240°F (60°C to 116°C).

Additional Features:• Heat-conductive compound for better bulb response in

oversized well. For more information on heat-conductive compound, see Material Safety Data Sheet (MSDS), form 69-0955.

• Case can be vertically or horizontally mounted. • High-limit dial stop is factory-set at end of high-limit scale;

can be adjusted.• TRADELINE® pack with cross reference label and special

instructions.

Standard ModelsModels: See Table 2.

Electrical Ratings:

Table 1. Circulator Control Circuit (Amperes).

Voltage and Frequency: 120 Vac, 60 Hz.Burner Control Circuits:Line Voltage: Ratings same as for circulator above.Low Voltage: 0.8A maximum at 24 Vac.Millivoltage: 0.25A at 1/4 to 12 Vdc.

Approvals:Underwriters Laboratories Inc. Listed: File No. MP466, Guide

No. MBPR (models with well); Guide No. MBPR2 (models without well).

Canadian Standards Association Certified: File No. LR1620, Guide No. 400-E-O.

ANSI Miswiring: Models with 1/4 in. tab terminal meet ANSI Appliance Miswiring Standard.

Immersion Well Dimensions: Brass Spud for Boiler Fitting: 1/2 or 3/4 NPT.Insulation Depth: 1-1/2 or 3 in. (38 or 76 mm).

NOTE: Not all models include wells. If well is not included but is needed, refer to form 68-0040 to order.

Insertion Length: 3-3/8 in. (86 mm).

Maximum Pressure On Immersion Well: 255 psi (1758 kPa).

Maximum Bulb Temperature:40°F higher than setpoint, or up to 265°F (23°C higher than

setpoint, or up to 129°C).

Material Safety Data Sheets (MSDS): For more information on heat-conductive compound, see form 69-0955.

Maximum Ambient Temperature:150°F (66°C) with 1.2A, 24V load.77°F (25°C) with 1.4A, 24V load.

Type 120 Vac 240 VacFull Load 7.4 3.7Locked Rotor 44.4 22.7


3 60-2278—9

Table 2. Standard L8148 Model Specifications.

a See Fig. 1 for case dimensions.b Number of V8043 Zone Valves that can be powered from the L8148 without additional transformer(s). 1.2A load is the

maximum permissible when ambient temperature exceeds 77°F (25°C).c Number of R8230C Relays that can be powered from the L8148. Additional relays in groups of four or fewer require an

additional transformer.d Models available with plug for connecting L8148E directly to the D892/M892 Vent Dampers.e Models available with plug (L8148E) and 50 VA transformer are for use with the Honeywell SV9500/SV9600 SmartValve®

System Control. No zone valves or relays can be powered from the L8148 when used with SV9500/SV9600 gas valves.

Maximum Ambient Temperature:150°F (66°C) with 1.2A 24V load;77°F (25°C) with 1.4A 24V load.

Thermostat Heat Anticipator Setting: 0.2A.

Standard Scale Range: 180°F to 240°F (82°C to 116°C).

Differential: Nonadjustable.

Finish: Gray enamel.

Optional Specifications:Scale Range: 140°F to 240°F (60°C to 116°C).High Limit Dial Stop.

Case Dimensions: See Fig. 1.

Accessories:107408 Heat Conductive Compound (4 oz. can). For

more information, see form 69-0955, Heat Conductive Compound.

124904 Well Adapter. For ordering information, see form 68-0040, Immersion Wells and Compression Fittings.

Fig. 1. L8148 dimensions in in. (mm).

Model Number

Burner Circuit Voltage

Mounting Casea

Special Provision for

Adding Remote Low Limit

High Limit

Second Limit

Circulator Control

Maximum Number of Zone Controls

Thermostat Required

Manual/Auto

SwitchValvesb Relaysc

L8148A Line Horizontal Yes Yes No Can be added remotely

— — 24V No

L8148Ed,e Low Vertical 2 4

L8148J Low or millivolt

Vertical or horizontal

Yes

3-1/8(79)

1/8 (3)

6-1/8(156)

3-3/8(86)

2-1/8 (54)(VERTICALMOUNT)

1-1/4 (32) (HORIZONTAL MOUNT—BOTTOM)

KNOCKOUTS FOR1/2 (13) CONDUIT

4-5/16 (110)

1-1/4 (32)(VERTICAL MOUNT)

3-1/16 (78)(HORIZONTALMOUNT)

M8925


60-2278—9 4

Fig. 2. Internal view of L8148A Aquasta® Relay.

Fig. 3. Internal view of L8148E Aquastat® Relay.

INSTALLATION

When Installing this Product…1. Read these instructions carefully. Failure to follow them

could damage the product or cause a hazardous condition.

2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.

3. Installer must be a trained, experienced service technician.

4. After installation is complete, check out product operation as provided in these instructions.

WARNINGExplosion Hazard.Can cause severe injury, death or property damage.This product is intended for use only in systems with a pressure relief valve.

WARNINGElectrical Shock Hazard.Can cause severe injury, death or equipment damage.1. Disconnect power supply before beginning

installation to prevent electrical shock or equipment damage.

2. Never apply a jumper across (or short) terminals B1, B2, or B3. This burns out the transformer.

Mounting (Standard Models)Boilers have tappings to allow immersion well (which must be ordered separately) to be mounted horizontally so boiler water of average temperature can circulate freely around the well.

1. Turn off all power and drain the boiler.2. If no tapping is provided, prepare one properly sized

and threaded, and locate near the top of the boiler.3. Coat the well threads sparingly with pipe dope, install

the well in the boiler tapping, and tighten securely.

NOTE: Do not attempt to tighten by using the case as a handle.

4. Refill the boiler and check for water leakage.5. Increase sensitivity of the bulb by coating with a good

heat-conductive compound. When used, coat the bulb completely.

6. Insert the bulb element into the well until it bottoms. If necessary, slightly bend the tube inside the case to hold the bulb against the bottom of the well.

NOTE: Some models have a tubing length adjustable to 3 in. (76 mm). In these models, pull out extra tubing from inside the case, if needed.

7. Center the loop of excess tubing in front of the immersion well so it cannot touch any electrical parts.

M8926

VOLTAGEBARRIER

TRANSFORMER

SWITCHINGRELAY

HIGHLIMITDIAL

M8927

TRANSFORMER

SWITCHINGRELAY

HIGHLIMITDIAL

GROUNDING SCREW


5 60-2278—9

8. Fit the case onto the well so the clamp on the case slides over the flange on the well. Tighten the clamp screw securely.

IMPORTANTBest thermal response is obtained with a well that snugly fits the sensing bulb. For wells used, the bulb should be inserted until it rests against the bottom of the well. Use a well of correct length and bend the tubing, if necessary, to hold the bulb against the bottom of well, but do not make a sharp bend in the tubing.

If the well does not fit snugly on the bulb, use the heat-conductive compound (furnished with TRADELINE® models) as follows: Fold the plastic bag of compound lengthwise and twist it gently. Then snip off the end of the bag and work the open end of the bag all the way into the well. Slowly pull out the bag while squeezing it firmly to distribute the compound evenly in the well. Insert the bulb all the way to the bottom of the well. Bend the tubing, if necessary, to hold the bulb against the bottom of the well and to hold the outer end of the bulb firmly in contact with the side of the well (Fig. 4). Wipe excess compound off the outer end of the well.

Mounting (TRADELINE® Models)If the old well is suitable, use it and an immersion well adapter (see Accessories) for the installation; otherwise, refer to the standard mounting procedure. (Well assemblies for the TRADELINE® Aquastat® Relays must be ordered separately; refer to form 68-0040, Wells and Fittings for Temperature Controllers.) The adapter has a flange at the wide end that fits into the well clamp and is slotted lengthwise to accommodate both the capillary tube and the short length of tube extending from the bulb (Fig. 4).

1. Turn off all power and remove the old control. Tag each external leadwire using the cover insert from the old control.

2. Loosen but do not remove the well clamp screw on the side of the control case.

3. Pull out the capillary tube until it bottoms in the well. Place the adapter around the capillary tube so it fits into the slot. Center the loop of excess capillary tubing in front of the immersion well so it cannot touch any electrical parts.

NOTE: Some models have a tubing length adjustable to 3 in. (76 mm). In these models, extra tubing inside the case can be pulled out, if needed.

4. Make sure the wide end of the adapter fits into the hole in the case. Position the immersion well clamp snugly over the flange on the adapter and tighten the clamp screw.

5. Insert the sensing bulb into the well as shown in Fig. 4. (Distribute heat-conductive compound prior to insertion.)

6. Securely tighten setscrew (if present on old well) against adapter.

WiringIMPORTANT

Terminals on the L8148 Aquastat¨ Relay are approved for use with only copper wire. The terminals allow only wrap-around wiring.

1.Strip 7/16 in. of insulation from the wire end.2.Wrap the wire at least 3/4 of the distance around the screw as shown.3.Using a standard, flat-headed screwdriver, tighten the screw until the wire is snugly in

contact with the screw and contact plate.4. Tighten the screw an additional one-half turn.

NOTE: Do not use a push-type ratchet screwdriver.

Disconnect power supply before making wiring connections to prevent electrical shock or equipment damage.

All wiring must comply with local electrical codes and ordinances. Do not exceed limits in the Specifications section when applying this control.

When wiring a switch equipped with 1/4 in. tab terminal connector, use 18 to 22 gauge wire with AMP Inc. part no. 2-520129-2 fully insulated flag receptacle connector or equivalent.

The L8148E,J can power up to two V8043 Zone Valves. Additional valves, in groups of two or fewer, require an additional transformer. Follow appropriate wiring diagrams, see Fig. 5 through 14, when using zone valves or a low limit controller.

NOTE: On systems requiring a vent damper, the vent damper can be connected directly to some L8148E Aquastat® Relay models (Fig. 12) or an S8610 Ignition Module (Fig. 11).

When the vent damper is plugged into the Aquastat¨ Relay, a fuse in the Aquastat¨ Relay will blow when the thermostat first closes. Once the fuse is blown, the Aquastat¨ Relay will not operate unless the vent damper is connected.

When the vent damper is plugged into the Aquastat¨ Relay, a fuse in the Aquastat¨ Relay will blow when the thermostat first closes. Once the fuse is blown, the Aquastat¨ Relay will not operate unless the vent damper is connected.

With the vent damper plugged into the S8610, a fuse in the ignition module will blow when first powered. Once the fuse is blown, the ignition module will not operate unless the vent damper is connected.

M8843


60-2278—9 6

Fig. 4. Position of bulb in immersion well, and use of well adapter when required.

CAUTIONEquipment Damage Hazard.Exceeding load limits can damage the equipment.1. When L8148E or J is used to power zone valves,

low voltage 1.4A; 1.2A load is the maximum permissible when ambient temperature exceeds 77°F (25°C). Use additional transformer(s) if load exceeds ratings.

2. When L8148E (with 50 VA transformer) is used to power SV9500/SV9600, a separate transformer must be used to power zone valves.

CONTROLLERCASE

IMMERSIONWELL CLAMP

ADAPTER

IMMERSIONWELL SPUD

BOILER

OLD IMMERSIONWELL ASSEMBLY

BACK OFCONTROLLER

CASE

IMMERSIONWELL CLAMPSCREW

ADAPTER

SENSING BULB

HEAT-CONDUCTIVE COMPOUND

SETSCREW

CAPILLARYTUBE

(C)

IMMERSIONWELL CLAMP

IMMERSIONWELL CLAMP SCREW

SHORT TUBE FITS IN CENTRALRECESS OF ADAPTER

BEND THE CAPILLARY TUBE TO HOLD THE SENSING BULB IN GOOD THERMAL CONTACT WITH THE IMMERSION WELL AT POINTS (A) AND (B).

ASSURE THAT CAPILLARY TUBE FITS FREELY IN THE ADAPTER SO THE TENSION OF THE CAPILLARY TUBE AT POINT (C) HOLDS THE SENSING BULB IN GOOD THERMAL CONTACT WITH THE IMMERSION WELL AT POINT (D).

M8830

1

1

2

2(D)

(B)

(A)


7 60-2278—9

Fig. 5. External connections and internal schematic for L8148A.

Fig. 6. Wiring L8148A in oil-fired, forced hot water, no tankless, zoned, pump system.

C1 C2 B1 B2

R

W

B

G L1 L2 T T

3

B

R

L1

L2

G

T T 3

C1

C2 B2 B1

JUMPER

1K 1K2

1K1

B R

L6006LOW LIMITCONTROLLER

L1HOT

L224VTHERMOSTAT

L8148A

HIGHLIMIT

TO LINEVOLTAGEOIL BURNERRELAY ORGAS VALVECIRCULATOR

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOADPROTECTION AS REQUIRED.

REMOVE JUMPER WHEN ADDING L6006 LOW LIMIT CONTROLLER.

CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.

B1 IS 1/4 IN. TAB TERMINAL.

1

2

3

4

4

1

2

3

M2842A

L8148A

4

T T

1 2 3 4 5 6

T T

1 2 3 4 5 6

T T

1 2 3 4 5 6

G L2 L1 T T

C1 C2 B2 B1

F

F

T

T

L1(HOT)

L2

PUMP PUMP PUMP

T87F T87F T87F

R845RELAY

R845 R845

C554

R8184G

BURNERANDIGNITION

ORANGE

WHITE

BLACK

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.



1

2

L8148A

2

1

M2843A3

3


60-2278—9 8

Fig. 7. External connections and internal schematic for L8148E.

Fig. 8. Wiring L8148E with multizone valves.

L1 (HOT)

L2

1

2

4

3

1

2

3

4

4



REMOVE JUMPER WHEN ADDING L6006 LOW LIMITCONTROLLER TO SYSTEM.


LOW VOLTAGEGAS VALVE (eg, VR8300)

TR TH

THTR

24VTHERMOSTAT

L8148E

CIRCULATOR

HIGHLIMIT


JUMPER

1K21K1

1K

L8148EL2

L2

L1

L1

G

G

Z

Z

W T

T

TV

TV

B1

B1

B2

B2

C1

C1

C2

C2

R

R

R

BB

B

W

W

M1621B

L1 (HOT)

L1 (HOT)

L2

L2

1

1

2

4

3

TO LOW VOLTAGEBURNERCIRCUIT

TR TH

TH-TR

T87FZONE 3

T87FZONE 2

T87FZONE 1

L8148E

CIRCULATOR

HIGHLIMIT

L2L1 G

Z

TTV

B1 B2

C1 C2

R

B

W

END SWITCH

V8043F

3

TR TH

TH-TR

END SWITCH

V8043F

3

TR TH

TH-TR

END SWITCH

V8043F



ADD JUMPER AS SHOWN.

L8148E POWERS TWO V8043 ZONE VALVES, OR ONLY ONE V8043 WHEN AMBIENT TEMPERATURE EXCEEDS 77°F (25°C). USE AN ADDITIONAL TRANSFORMER FOR ADDITIONAL VALVES; A MAXIMUM OF TWO VALVES CAN BE POWERED WITH ONETRANSFORMER.


1

2

3

4

5

5

M1622C


9 60-2278—9

Fig. 9. Wiring L8148E in a gas-fired, 24V, forced hot water, no tankless, zoned, pump system.

Fig. 10. Wiring L8148E in multizone system with R845 switched circulator.

T T

1 2 3 4 5 6

T T

1 2 3 4 5 6

T T

1 2 3 4 5 6

G L2 L1 T T

C1 C2 B2 B1

L1(HOT)

L2

PUMP PUMP PUMP

T87F T87F T87F

R845 RELAY R845 R845




1

2

3

3

L8148E

2

1

M1620A

LOW VOLTAGEGAS VALVE (eg, VR8300)

TR

THTHTR

L1 (HOT)

L2

1

2

3

1

2

3



B1 IS 1/4 IN. TAB TERMINALS.M8888

TV

T

W

Z

B1

B2

C1

C2

L1

L2

G

24VTHERMOSTAT

CIRCULATORZONE 1

L8148E

2

1

4

3

5

6

R845A RELAY ZONE 1

TO ADDITIONAL R845A RELAYS FOR OTHER ZONES

LOW VOLTAGEGAS VALVE (VR8300)

TR

TH

THTR


60-2278—9 10

Fig. 11. Wiring L8148E with S8610A,F Intermittent Pilot Ignition Module with automatic vent damper plug and Honeywell D892/M892 Vent Damper.

Fig. 12. Wiring L8148E with internal plug directly to D892/M892 Vent Damper in hydronic intermittent pilot system.

3

1

2

3

4

5

4

5

2

1


REMOVE PLUG ONLY IF USING VENT DAMPER. WITH PLUG REMOVED AND VENT DAMPER CONNECTED, FUSE BLOWS WHEN THERMOSTAT FIRST CLOSES. THEN MODULE OPERATES ONLY WHEN VENT DAMPER IS CONNECTED.

CAREFULLY FOLLOW WIRING; MISWIRING COULD RESULT IN CONSTANT ON.



S8610

MV MV/PV PV GND(BURNER)

24VGND 24V TH-W SPARK

VENTDAMPERPLUG

THERMOSTATL8148E (STANDARD MODELS)

G

L1

1K2HIGH LIMIT

L2

Z W1K

T

TV B1 C1

B2 C2

VR8304

WIRINGHARNESS

D892/M892

B R1K1

M2298D

PV

PVMV

MV

24V GND24V

S8600

L1 (HOT)

L211

2

3

4

5

L8148E

4

2

3FUSE

5

1

2

3

5

6-PRONG FEMALE MOLEXRECEPTACLE IN L8148EAND 5-PRONG MALEMOLEX PLUG ON CABLE

1K1

B1 B2 L1

C1 C2

L2

CIRCULATOR

POLARIZED 4-PRONGMALE MOLEX PLUG AND4-PRONG FEMALEMATING PLUG ON CABLE

1

2

3

4

24 VACTHERMOSTAT

D892/M892 4 197516ACABLE

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOADPROTECTION AS REQUIRED.

REMOVE PLUG-IN THAT JUMPERS PINS 2 AND 3 WHEN USING VENTDAMPER.

AFTER VENT DAMPER IS PLUGGED INTO L8148E, FUSE BLOWSWHEN THERMOSTAT FIRST CLOSES. AFTER FUSE BLOWS, L8148EOPERATES ONLY WHEN VENT DAMPER IS CONNECTED.

SEE VENT DAMPER PRODUCT SPECIFICATIONS FOR INTERNALSCHEMATICS.

B1 IS 1/4 IN. TAB TERMINAL. M1624C

1K2

HIGH LIMITCONTROLLER

R

B

TV W T

1KZ


11 60-2278—9

Fig. 13. Internal schematic and external connections for wiring L8148J for either low voltage or millivoltage gas valves.

Fig. 14. Multizone system with R882C switched circulator.

L1 (HOT)

L2

1

1

4

5

5

1

2

3

4

5

23


REMOVE Z-W JUMPER IF SERIES 60 LOW LIMIT IS USED. WIRE LOW LIMIT CONTROLLER OR ZONE VALVES AS SHOWN. USE WITH 24V (B1-B3) CIRCUIT ONLY.

FOR 24V BURNER, WIRE B1-B3 AND USE JUMPER Z-W AND TP-Z. FOR POWERPILE® (MILLIVOLTAGE) GAS VALVES, REMOVE JUMPER TP-Z AND WIRE BURNER B1-B2. JUMPER Z-W REMAINS IN POSITION.




POWERPILE®MILLIVOLTAGEGAS VALVE

PP

PP TH2

TH1

W

R

R

R

B

B

B

24VTHERMOSTAT

L8148J

CIRCULATOR

G

G

L1

L1

L2B3B2B1

HIGHLIMIT

TP

TV TW

Z

C1 C2

TR TH

THTRLOW VOLTAGE

GAS VALVE(eg, VR8300)

1K3TP

Z W T

TV

1K2AUTOMANUALSWITCH

1K1

C1

C2B3 B2 B1

L2

L8148J

M1793B

TV

T

W

W

Z

B1

B2

C1

C2

L1

L2

G

L8148

CIRCULATORZONE 1

CIRCULATORZONE 2

CIRCULATORZONE 3

L1 (HOT)

L2

1

2

3

4

5

6

1

2

3 4

5

4

6



AS MANY AS THREE R882C RELAYS CAN BE POWERED BY THE L8148E OR J. ADDITIONALGROUPS, WITH A MAXIMUM OF THREE RELAYS PER GROUP, REQUIRE AN ADDITIONAL TRANSFORMER.

R882C IS PROVIDED WITH NEC CLASS 1 ENCLOSURE.

L8148E SHOWN. L8148J IS IDENTICAL EXCEPT WITH ADDITION OF TP AND BE TERMINALS.

B1 IS 1/4 IN. TAB TERMINAL. M1623B

TOBURNERCIRCUIT

N.O.N.C.COM.

N.O.N.C.COM.

R882C

B W

N.O.N.C.COM.

N.O.N.C.COM.

R882C

B W

N.O.N.C.COM.

N.O.N.C.COM.

R882C

B

T87FZONE 1

T87FZONE 2

T87FZONE 3

60-2278—9 G.R. Rev. 12-01 www.honeywell.com

Automation and Control Solutions Automation and Control SolutionsHoneywell Honeywell Limited-Honeywell Limitée1985 Douglas Drive North 35 Dynamic DriveGolden Valley, MN 55422 Scarborough, Ontario

M1V 4Z9

Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers.


SETTING AND ADJUSTMENTS

Setting

High Limit SwitchHeating systems differ and the correct temperature setting for one system may not be the correct setting for another. Follow the boiler manufacturer recommendations for proper setting. With cover off, turn the dial until the desired setting is directly below the indicator. Models with optional dial stop can be adjusted using a small screwdriver as shown in Fig. 15.

Fig. 15. Adjusting models with optional dial stop.

OPERATION

WARNINGExplosion Hazard.Can cause severe injury, death or property damage.This product is intended for use only in systems with a pressure relief valve.

The switching relay is controlled by the low voltage room thermostat. On a call for heat, the relay contacts make to complete the line voltage circulator circuit and also the burner circuit when the boiler water temperature is below the high limit. The high limit switch shuts off the burner if boiler water temperature exceeds the high limit setting.

The AUTO-MANUAL switch (only L8148J millivolt models) operates the burner during electrical power failure. With the switch at MANUAL, the burner operates continuously until high limit is reached or the switch is reset to AUTO. The circulator, requiring line voltage, is inoperative. When power is restored, reset the switch to AUTO to resume automatic operation.

CAUTIONEquipment Damage Hazard.Can cause equipment damage and operational failure.Never apply a jumper across (or short) terminals B1, B2, or B3. This burns out the transformer.

CHECKOUTPut the system in operation and observe through at least one complete cycle to be sure all equipment functions as described in the Operation section.

INSERT CORNER OF SMALL SCREWDRIVER IN THIS NOTCH AND PRY STOP UPWARD FROM DIAL FACE

WHILE HOLDING STOP AWAYFROM DIAL FACE WITH SCREWDRIVER, TURN DIAL UNTIL DESIRED HIGH LIMIT SETTING IS ALIGNED WITH POINTER

RELEASE SCREWDRIVER;MAKE SURE HIGH-LIMITSTOP RESTS FLATAGAINST DIAL FACE

POINTER

HIGH LIMITSTOP

DIAL FACE

M8889

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