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L8104A,B,C,D
Electronic Water
Heater Controllers
L8104B with
The L8104A,B,C,D Electronic Controllers pro-
Potentiometer
vide temperature control and ECO limit action for
gas water heaters.
Remote
Potentiometer
Sensing
Bulb
■ L8104A,B are used in standing pilot and electronic ■ Temperature range is factory-set to meet application
ignition systems. requirements. Maximum setting temperature is 200°F
■ L8104C,D are used only in electronic ignition sys- (93°C).
tems. ■ ECO limit setting is factory-se
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L8104A,B,C,D SPECIFICATIONS • ORDERING INFORMATION Specifications DIFFERENTIAL: Factory set from 2 ± 0.5°F (1 ± 0.3°C) to IMPORTANT: The specifications given in this publication 15 ± 4.5°F (8 ± 2.5°C). Specify when ordering. do not include normal manufacturing tolerances. AMBIENT TEMPERATURE RANGE AT MODULE: 0°F Therefore, this unit may not exactly match the listed to +175°F (-18°C to +80°C). specifications. Also, this product is tested and cali- ECO LIMIT SWITCH: Recycling or nonrecycling (one-
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160 100 140 L8104A,B,C,D SPECIFICATIONS DIMENSIONS: available through your Honeywell sales representative. L8104: Fig. 1. Please provide the ordering information indicated in the L8104A,B: Fig. 2. Ordering Information section to assure correct replace- L8104C,D: Fig. 3. ment components. APPROVALS: Underwriters Laboratories Inc. Component Recognized: File No. MP466, Guide No. MBPR2. Fig. 1—Approximate dimensions in in. (mm) of L8104 Remote Potentiometer and Sensing Bulb. American Gas Association
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160 100 140 L8104A,B,C,D SPECIFICATIONS ACCESSORIES: L8104B: L8104A: 198799A Sensor Assembly: 42 in. (107 cm) 125°C 4074ENP Potentiometer Assembly: 199075A Poten- (257°F) leadwires with 1/4 in. quick connects. tiometer: Clockwise turn increases temperature, 198799B Sensor Assembly: 42 in. (107 cm) 150°C two 18 in. [46 cm] leadwires with 1/4 in. quick (302°F) leadwires with 1/4 in. quick connects. connects. Washer and nut. 198799C Sensor Assembly: 42 in. (107 cm) 105°C 4074ENS Potentiometer Assem
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L8104A,B,C,D INSTALLATION Installation WHEN INSTALLING THIS PRODUCT… Electronic Control Module 1. Read these instructions carefully. Failure to follow Locate the electronic control module on a wall or panel them could damage the product or cause a hazardous in the wiring compartment of the water heater. The module condition. must be within easy reach of the sensor leadwires in a 2. Check the ratings given in the instructions and on location that is convenient for reading and changing the the pro
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160 100 140 L8104A,B,C,D INSTALLATION Fig. 5—L8104A with board-mounted potentiometer in a standing pilot application. L8104A BLACK 3 SEN-1 BLACK 3 SENSING BULB WITH ECO SWITCH LOWER COM. 2 3 24V RELAY HOT 2 Q308 ONLY NO 2 ECO 1 POWER SUPPLY. PROVIDE DISCONNECT CONNECTOR MEANS AND OVERLOAD PROTECTION VR8200 AS REQUIRED. TH TR GAS VLAVE 2 1/4 IN. TAB TERMINALS (3). 1 L1 (HOT) 3 3/16 IN. TAB TERMINALS (3). M131C L2 24V Fig. 6—L8104A with remote potentiometer in an electronic ignition applicatio
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160 100 140 L8104A,B,C,D INSTALLATION Fig. 7—L8104B with remote potentiometer in a standing pilot application. 1 SETPOINT 2 L8104B POTENTIOMETER (SHOWN FROM BACK) 2 3 POT UPPER BLACK BLACK 4 4 SEN-1 SEN-2 BLACK BLACK 4 SENSING BULB WITH 4 SENSING BULB ECO SWITCH LOWER COM. 3 4 24V RELAY HOT 3 Q308 NO ONLY 3 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. ECO 2 FACTORY JUMPER INSTALLED, DO NOT CONNECTOR REMOVE. VR8200 TH TR GAS VLAVE 3 1/4 IN. TAB TERMINALS (3).
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L8104A,B,C,D INSTALLATION Fig. 9—L8104C with remote-mounted potentiometer in an electronic ignition application. S8600H VENT 5 DAMPER GND 24V TH-W PLUG MV MV/PV PV (BURNER) GND 24V (OPT) SPARK (OPT) 5 MAIN PILOT COM VALVE BLACK DUAL VALVE 1ST 2ND COMBINAITON OPERATOR OPERATOR BLACK GAS CONTROL SENSING BULB 1 L8104C 2 3 2 POT SETPOINT POTENTIOMETER (SHOWN FROM BACK) BLACK SEN-1 UPPER BLACK SENSING BULB WITH ECO SWITCH LOWER SEN-2 L1 (HOT) COM. 4 L2 24V 1 Q345, Q346, Q348, PILOT Q362, Q381
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L8104A,B,C,D INSTALLATION Fig. 10—L8104D with remote-mounted potentiometer in an electronic ignition application S8600H VENT 5 DAMPER GND 24V TH-W PLUG MV MV/PV PV (BURNER) GND 24V (OPT) (OPT) SPARK 5 MAIN COM PILOT VALVE DUAL VALVE 1ST 2ND COMBINATION OPERATOR OPERATOR GAS CONTROL 1 2 L8104D 3 2 POT SETPOINT POTENTIOMETER (SHOWN FROM BACK) BLACK SEN-1 BLACK SENSING BULB WITH ECO SWITCH LOWER L1 (HOT) COM. 4 L2 24V 1 Q345, Q346, Q348, PILOT Q362, Q381 BURNER LOAD PILOT BURNER/ GROUND PV
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L8104A,B,C,D SETTING AND CHECKOUT Setting and Checkout SET CONTROL TEMPERATURE If the potentiometer is mounted on the control module, Fig. 11—Scale range for 3K remotely mounted potentiometer when used with L8104B Dual turn the selector knob to the desired temperature. Bulb Controller. If the potentiometer is remotely mounted, the position of the flat part of the shaft determines the approximate control 200650 POTENTIOMETER temperature. Fully counterclockwise rotation when the shaft is towards y
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L8104A,B,C,D SETTING AND CHECKOUT • OPERATION TABLE 2—THERMISTOR RESISTANCE AT VARIOUS TEMPERATURES IN CELSIUS. Temp- Resistance (K ohms) erature (°C) 01 2 3 4 5 67 8 9 0 32648 31026 29495 28049 26682 25389 24166 23010 21915 20879 10 19898 18968 18088 17253 16461 15710 14998 14322 13680 13071 20 12492 11942 11419 10922 10450 10000 9572 9165 8778 8409 30 8057 7722 7403 7099 6808 8532 6268 6016 5775 5546 40 5327 5117 4917 4726 4543 4368 4201 4042 3889 3742 50 3602 3468 3340 3217 3099 2986 2878 2
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L8104A,B,C,D TROUBLESHOOTING Troubleshooting If water temperature is too hot, proceed as follows: L8104A, B, C, D START DISCONNECT SENSOR LEADS FROM ELECTRONIC CONTROL MODULE AND MEASURE RESISTANCE OF SENSOR(S) WITH OHMMETER. IS RESISTANCE BETWEEN 700K AND 30K OHMS NO SENSOR(S) MAY BE SHORTED OR OPEN. (SEE TABLE 1)? CHECK FOR LOOSE, BROKEN OR SHORTED WIRES. REPLACE SENSING BULB(S) IF NECESSARY. YES SENSOR(S) OK. DISCONNECT ECO LEADS AND MEASURE RESISTANCE WITH OHMMETER. IS WATER YES REPLACE
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L8104A,B,C,D TROUBLESHOOTING If water temperature is too cold or heater does not come on, proceed as follows: L8104A, B START CHECK VOLTAGE AT 24V TERMINALS OF ELECTRONIC CONTROL MODULE. NO CHECK TRANSFORMER, 120V SUPPLY, IS VOLTAGE BETWEEN 21.5 AND CORRECT AS NECESSARY. 28.5 VAC? YES IS THIS AN ELECTRONIC IGNITION SYSTEM WITH 100 PERCENT LOCKOUT? YES DISCONNECT 24V POWER AT IGNITION MODULE AND RECONNECT AFTER YES ABOUT 1 MIN. SET POTENTIOMETER TO IGNITION MODULE WAS IN LOCKOUT. MAX TEMPE
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L8104A,B,C,D TROUBLESHOOTING L8104C, D YES SYSTEM SHUT DOWN DUE TO ECO IS LED LIT? OPENING. DEPRESS AND RELEASE MANUAL NO RESET BUTTON. NO DOES LED TURN OFF? CHECK VOLTAGE AT 24V TERMINALS YES OF ELECTRONIC CONTROL MODULE. NO CHECK TRANSFORMER, 120V SUPPLY, IS VOLTAGE BETWEEN 21.5 AND CORRECT AS NECESSARY. 28.5 VAC? SYSTEM RESET. YES REFER TO TROUBLESHOOTING IF WATER IS TOO HOT. IS THIS AN ELECTRONIC IGNITION SYSTEM WITH 100 PERCENT LOCKOUT? YES DISCONNECT 24V POWER AT IGNITION MODULE A
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L8104A,B,C,D MATERIAL SAFETY DATA SHEET 15 68-0063—3
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L8104A,B,C,D MATERIAL SAFETY DATA SHEET 68-0063—3 16
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L8104A,B,C,D MATERIAL SAFETY DATA SHEET 17 68-0063—3
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L8104A,B,C,D MATERIAL SAFETY DATA SHEET 68-0063—3 18
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L8104A,B,C,D MATERIAL SAFETY DATA SHEET 19 68-0063—3
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L8104A,B,C,D MATERIAL SAFETY DATA SHEET Home and Building Control Home and Building Control Helping You Control Your World Honeywell Inc. Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 740 Ellesmere Road Golden Valley, MN 55422 Scarborough, Ontario M1P 2V9 68-0063—3 20 Printed in U.S.A. customer.honeywell.com
