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68-0063—3 2
L8104A,B,C,D
SPECIFICATIONS • ORDERING INFORMATION
Specifications
IMPORTANT: 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 cali-
brated under closely controlled conditions, and some
minor differences in performance can be expected if
those conditions are changed.
MODELS:
L8104A Electronic Commercial Water Heater Control-
ler: Includes electronic control module, single sensing
bulb containing thermistor and ECO switch, and re-
mote- or board-mounted potentiometer.
L8104B Electronic Commercial Water Heater Control-
ler: Includes electronic control module, two sensing
bulbs (one with thermistor and ECO switch and one
with thermistor only), and remote- or board-mounted
potentiometer. Models are available with sensing au-
thority allocated between the upper and lower sensing
bulbs in ratios of 1:1, 2:1, 3:1 and 4:1; specify when
ordering.
L8104C Electronic Commercial Water Heater Control-
ler: Same as the L8104B with additional circuitry to
manually reset the ECO switch.
L8104D Electronic Commercial Water Heater Control-
ler: Same as the L8104A with additional circuitry to
manually reset the ECO switch.
ELECTRICAL RATINGS:
Power Supply: 24 Vac, 50/60 Hz.
Gas Control Relay Contacts:
Inductive: 2A full load, 10A locked rotor.
Resistive: 2A.
TEMPERATURE SETTING RANGE: Temperature range
factory set to meet application requirements. Maximum
setting temperature is 200°F (93°C). Specify desired
range when ordering.
Ordering Information
When purchasing replacement and modernization products from your TRADELINE® wholesaler or your distributor, refer to the Tradeline
Catalog or price sheets for complete ordering number, or specify—
1. Order number. 6. Potentiometer mounted on electronic module or remote unit.
2. Temperature setting range desired. 7. Setting scale for board-mounted potentiometer.
3. Differential setting desired. 8. Sensing authority desired (L8104B,C only).
4. ECO cutout temperature desired. 9. Sensing bulb: Specify style, material, and lead wire length.
5. Recycling or nonrecycling ECO switch. 10. Additional system components, if desired.
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).
2. Home and Building Control Customer Logistics
Honeywell Inc., 1885 Douglas Drive North
Minneapolis, 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.
DIFFERENTIAL: Factory set from 2 ± 0.5°F (1 ± 0.3°C) to
15 ± 4.5°F (8 ± 2.5°C). Specify when ordering.
AMBIENT TEMPERATURE RANGE AT MODULE: 0°F
to +175°F (-18°C to +80°C).
ECO LIMIT SWITCH: Recycling or nonrecycling (one-
shot). Sensing bulb must be replaced if nonrecycling ECO
switch opens. Cutout temperature is factory set to meet
application requirements. Specify type and desired cutout
temperature when ordering. Recycling ECO is used on
manual reset models (L8104C,D).
POTENTIOMETER:
Remote: Minimum setting is at fully counterclockwise
rotation. Has 12 in. (30 cm) leadwires on ter-
minals 1 and 2 and factory-mounted jumper across
terminals 2 and 3. Specify when ordering L8104.
Board-mounted: Setting scaleplate provided. Specify range
and board mounting when ordering L8104.
SENSING BULB: Bulbs available in several styles and
materials with various leadwire lengths. Thermistor sen-
sor and ECO limit are factory-mounted in bulb; leads
terminate with 1/4 in. quick connects. Second bulb on
L8104B contains only thermistor sensor; leads terminate
with 3/16 in. quick connects.
MOUNTING:
Electronic Control Module: Mounts on enclosed panel
with four no. 6 or 8 screws (obtained locally) through
standoffs on module corners. Can be mounted in loca-
tions that reach up to 95 percent relative humidity
(noncondensing), but avoid locations where water
may drip on module.
Sensing Bulbs: Can be mounted in immersion well or
directly immersed if properly sealed to prevent leak-
age. Well or seal must be ordered separately.
Setpoint Potentiometer: Remote potentiometer mounts
through panel with nut on threaded shaft.