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The L8104A,B,C,D Electronic Controllers pro-
vide temperature control and ECO limit action for
gas water heaters.
L8104A,B are used in standing pilot and electronic
ignition systems.
L8104C,D are used only in electronic ignition sys-
tems.
Includes electronic module, one or two sensing bulbs,
and setpoint potentiometer (remote- or board-
mounted).
Sensing bulb contains thermistor sensor and ECO
switch. Second bulb in L8104B,C contains ther-
mistor only.
L8104A has single sensing bulb.
L8104B has two sensing bulbs available with upper
and lower bulb sensing authority allocated in ratios
of 1:1, 2:1, 3:1, and 4:1. Two sensing bulbs provide
temperature averaging.
L8104C has two sensing bulbs and manual reset
pushbutton.
L8104D has one sensing bulb and manual reset
pushbutton.
J. H. • Rev. 6-95 • ©Honeywell Inc. 1995
L8104A,B,C,D
Electronic Water
Heater Controllers
Temperature range is factory-set to meet application
requirements. Maximum setting temperature is 200°F
(93°C).
ECO limit setting is factory-set to meet application
requirements.
For L8104A,B, standing pilot must be manually re-
lit or ignition module must be reset when ECO shuts
off gas control.
For L8104C,D, ignition module must be reset using
pushbutton switch mounted on electronic control
module when ECO shuts off gas control.
Control circuit is accurate within ±3.5°F (1.9°C) at
maximum setpoint (200°F [93°C]; setpoint controls
are accurate within +7°F [+3.8°C], -0°F [-0°C]).
CONTENTS
Specifications ................................................. 2
Ordering Information ..................................... 2
Installation ..................................................... 5
Setting and Checkout .................................... 10
Operation ..................................................... 11
Troubleshooting ........................................... 12
Material Safety Data Sheets ......................... 15
1
L8104B with
Potentiometer
Remote
Potentiometer
Sensing
Bulb
68-0063-3
68-0063-3
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Related Manuals for Honeywell L8104B
Summary of Contents for Honeywell L8104B
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Page 1: Table Of Contents
Second bulb in L8104B,C contains ther- mistor only. L8104A has single sensing bulb. L8104B has two sensing bulbs available with upper and lower bulb sensing authority allocated in ratios of 1:1, 2:1, 3:1, and 4:1. Two sensing bulbs provide temperature averaging. -
Page 2: Specifications
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 Honeywell Home and Building Control Sales Office (please check the white pages of your phone directory). - Page 3 L8104A DOES NOT HAVE UPPER OR SEN-2 TERMINALS. 1/4 IN. TAB TERMINALS (3) 3/16 IN. TAB TERMINALS (5) available through your Honeywell sales representative. Please provide the ordering information indicated in the Ordering Information section to assure correct replace- ment components.
- Page 4 MODELS WITH REMOTE POTENTIOMETER HAVE TWO 1/4 IN. TAB TERMINALS IN PLACE OF THE POTENTIOMETER. 68-0063—3 L8104B: 198799A Sensor Assembly: 42 in. (107 cm) 125°C 198799B Sensor Assembly: 42 in. (107 cm) 150°C 198799C Sensor Assembly: 42 in. (107 cm) 105°C 198799D Sensor Assembly: 42 in.
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Page 5: Installation
Use heat-conductive compound (available in 4 oz can as Honeywell part no. 107408) to fill the space between the bulb and the well and improve heat transfer characteris- tics. - Page 6 L8104A,B,C,D INSTALLATION Fig. 5—L8104A with board-mounted potentiometer in a standing pilot application. Q308 CONNECTOR (HOT) Fig. 6—L8104A with remote potentiometer in an electronic ignition application. S8600F,H,M; S8610F,H MV MV/PV PV (BURNER) (HOT) 68-0063—3 L8104A BLACK SEN-1 BLACK LOWER COM. RELAY ONLY VR8200 GAS VLAVE...
- Page 7 Fig. 7—L8104B with remote potentiometer in a standing pilot application. L8104B UPPER BLACK SEN-2 BLACK SENSING BULB COM. RELAY Q308 CONNECTOR (HOT) Fig. 8—L8104B with board-mounted potentiometer in an electronic ignition application. L8104B UPPER BLACK SEN-2 BLACK SENSING BULB COM.
- Page 8 L8104A,B,C,D INSTALLATION Fig. 9—L8104C with remote-mounted potentiometer in an electronic ignition application. BLACK BLACK SENSING BULB L8104C UPPER SEN-2 LOAD POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FACTORY INSTALLED JUMPER. DO NOT REMOVE. MAXIMUM CABLE LENGTH 3 FT. (0.9M). 68-0063—3 S8600H MV MV/PV PV...
- Page 9 Fig. 10—L8104D with remote-mounted potentiometer in an electronic ignition application L8104D SEN-1 LOWER LOAD VALVE POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FACTORY INSTALLED JUMPER. DO NOT REMOVE. MAXIMUM CABLE LENGTH 3 FT. (0.9M). S8600H (BURNER) GND 24V MV MV/PV PV MAIN PILOT...
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Page 10: Setting And Checkout
2043 2004 1688 1656 1402 1376 1170 1150 68-0063—3 Setting and Checkout Fig. 11—Scale range for 3K remotely mounted potentiometer when used with L8104B Dual Bulb Controller. rotation when Resistance (K ohms) 24712 24045 23399 22771 18876 18383 17905 17440... -
Page 11: Operation
(180°F (83°C) setpoint controls are accurate within +7°F (+3.8°C), -0°F (0°C). L8104B,C Operation of the L8104B,C is similar to L8104A,D ex- cept the electronic control module opens and closes the relay in response to the average of the temperatures sensed by the upper and lower sensing bulbs. -
Page 12: Troubleshooting
L8104A,B,C,D TROUBLESHOOTING If water temperature is too hot, proceed as follows: START DISCONNECT SENSOR LEADS FROM ELECTRONIC CONTROL MODULE AND MEASURE RESISTANCE OF SENSOR(S) WITH OHMMETER. IS RESISTANCE BETWEEN 700K AND 30K OHMS (SEE TABLE 1)? SENSOR(S) OK. DISCONNECT ECO LEADS AND MEASURE RESISTANCE WITH OHMMETER. - Page 13 OBSERVE FOR 2-3 CYCLES TO MAKE SURE SYSTEM IS OTHERWISE OK. REPLACE SENSING BULB WITH ECO SWITCH AND OBSERVE SYSTEM IN OPERATION. IF WATER HEATER DOES NOT TURN OFF AFTER WATER REACHES SET POINT TEMPERATURE, REFER TO TROUBLESHOOTING IF WATER IS TOO HOT.
- Page 14 L8104A,B,C,D TROUBLESHOOTING SYSTEM SHUT DOWN DUE TO ECO OPENING. DEPRESS AND RELEASE MANUAL RESET BUTTON. DOES LED TURN OFF? SYSTEM RESET. REFER TO TROUBLESHOOTING IF WATER IS TOO HOT. DISCONNECT ECO LEADS AND MEASURE RESISTANCE WITH OHMMETER. IS RESISTANCE GREATER THAN 100K OHMS WITH WATER TEMPERATURE LESS THAN 180°F? REPLACE SENSING BULB WITH...
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Page 15: Material Safety Data Sheets
L8104A,B,C,D MATERIAL SAFETY DATA SHEET 68-0063—3... - Page 16 L8104A,B,C,D MATERIAL SAFETY DATA SHEET 68-0063—3...
- Page 17 L8104A,B,C,D MATERIAL SAFETY DATA SHEET 68-0063—3...
- Page 18 L8104A,B,C,D MATERIAL SAFETY DATA SHEET 68-0063—3...
- Page 19 L8104A,B,C,D MATERIAL SAFETY DATA SHEET 68-0063—3...
- Page 20 MATERIAL SAFETY DATA SHEET Home and Building Control Honeywell Inc. 1985 Douglas Drive North Golden Valley, MN 55422 68-0063—3 Printed in U.S.A. Home and Building Control Honeywell Limited—Honeywell Limitée 740 Ellesmere Road Scarborough, Ontario M1P 2V9 Helping You Control Your World customer.honeywell.com...