Honeywell L8104B User Manual
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1 68-0063—3
J. H. • Rev. 6-95 • ©Honeywell Inc. 1995
L8104A,B,C,D
Electronic Water
Heater Controllers
The L8104A,B,C,D Electronic Controllers pro-
vide temperature control and ECO limit action for
gas water heaters.
L8104B with
Potentiometer
Remote
Potentiometer
Sensing
Bulb
■ 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.
68-0063-3
■ 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
- L8104A,B,C,D 1
- Electronic Water 1
- Heater Controllers 1
- Specifications 2
- Ordering Information 2
- Installation 5
- 68-0063—3 6 6
- INSTALLATION 6
- 7 68-0063—3 7
- 68-0063—3 8 8
- 9 68-0063—3 9
- Setting and Checkout 10
- Operation 11
- Troubleshooting 12
- L8104A, B 13
- 68-0063—3 14 14
- TROUBLESHOOTING 14
- 15 68-0063—3 15
- MATERIAL SAFETY DATA SHEET 15
- 68-0063—3 16 16
- 17 68-0063—3 17
- 68-0063—3 18 18
- 19 68-0063—3 19
- 68-0063—3 20 20
Summary of Contents
Page 1 - Heater Controllers
1 68-0063—3J. H. • Rev. 6-95 • ©Honeywell Inc. 1995L8104A,B,C,DElectronic WaterHeater ControllersThe L8104A,B,C,D Electronic Controllers pro-vide
Page 2 - Ordering Information
68-0063—3 10L8104A,B,C,DSETTING AND CHECKOUTSetting and CheckoutSET CONTROL TEMPERATUREIf the potentiometer is mounted on the control module,turn the
Page 3
11 68-0063—3L8104A,B,C,DSETTING AND CHECKOUT • OPERATIONTABLE 2—THERMISTOR RESISTANCE AT VARIOUS TEMPERATURES IN CELSIUS.OperationL8104A,DWhen the t
Page 4
68-0063—3 12L8104A,B,C,DTROUBLESHOOTINGDISCONNECT SENSOR LEADS FROM ELECTRONICCONTROL MODULE AND MEASURE RESISTANCE OF SENSOR(S) WITH OHMMETER.IS RESI
Page 5 - Installation
13 68-0063—3L8104A,B,C,DTROUBLESHOOTINGCHECK TRANSFORMER, 120V SUPPLY, CORRECT AS NECESSARY. IGNITION MODULE WAS IN LOCKOUT.OBSERVE FOR 2-3 CYCLES TO
Page 6 - INSTALLATION
68-0063—3 14L8104A,B,C,DTROUBLESHOOTINGCHECK TRANSFORMER, 120V SUPPLY, CORRECT AS NECESSARY. IGNITION MODULE WAS IN LOCKOUT.OBSERVE FOR 2-3 CYCLES TO
Page 7 - 7 68-0063—3
15 68-0063—3L8104A,B,C,DMATERIAL SAFETY DATA SHEET
Page 8 - 68-0063—3 8
68-0063—3 16L8104A,B,C,DMATERIAL SAFETY DATA SHEET
Page 9 - 9 68-0063—3
17 68-0063—3L8104A,B,C,DMATERIAL SAFETY DATA SHEET
Page 10 - Setting and Checkout
68-0063—3 18L8104A,B,C,DMATERIAL SAFETY DATA SHEET
Page 11 - Operation
19 68-0063—3L8104A,B,C,DMATERIAL SAFETY DATA SHEET
Page 12 - Troubleshooting
68-0063—3 2L8104A,B,C,DSPECIFICATIONS • ORDERING INFORMATIONSpecificationsIMPORTANT: The specifications given in this publicationdo not include normal
Page 13 - L8104A, B
68-0063—3 20L8104A,B,C,DMATERIAL SAFETY DATA SHEETHome and Building Control Home and Building Control Helping You Control Your WorldHoneywell Inc. Hon
Page 14 - TROUBLESHOOTING
3 68-0063—3L8104A,B,C,DSPECIFICATIONSDIMENSIONS:L8104: Fig. 1.L8104A,B: Fig. 2.L8104C,D: Fig. 3.APPROVALS:Underwriters Laboratories Inc. Component Rec
Page 15 - MATERIAL SAFETY DATA SHEET
68-0063—3 4L8104A,B,C,DSPECIFICATIONSACCESSORIES:L8104A:4074ENP Potentiometer Assembly: 199075A Poten-tiometer: Clockwise turn increases temperature,t
Page 16 - 68-0063—3 16
5 68-0063—3L8104A,B,C,DINSTALLATIONInstallationWHEN INSTALLING THIS PRODUCT…1. Read these instructions carefully. Failure to followthem could damage t
Page 17 - 17 68-0063—3
68-0063—3 6L8104A,B,C,DINSTALLATIONFig. 5—L8104A with board-mounted potentiometer in a standing pilot application.M131CPOWER SUPPLY. PROVIDE DISCONNE
Page 18 - 68-0063—3 18
7 68-0063—3L8104A,B,C,DINSTALLATIONFig. 7—L8104B with remote potentiometer in a standing pilot application.Fig. 8—L8104B with board-mounted potentiome
Page 19 - 19 68-0063—3
68-0063—3 8L8104A,B,C,DINSTALLATIONFig. 9—L8104C with remote-mounted potentiometer in an electronic ignition application.SENSING BULBWITH ECO SWITCH12
Page 20 - 68-0063—3 20
9 68-0063—3L8104A,B,C,DINSTALLATIONFig. 10—L8104D with remote-mounted potentiometer in an electronic ignition applicationSENSING BULBWITH ECO SWITCH12
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