Honeywell L8104B User Manual

L8104a,b,c,d electronic water heater controllers

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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

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