4
Move the temperature setting lever about 10
°
F [6
°
C]
below room temperature. Cooling and fan should start
immediately. Move temperature setting lever about 10
°
F
[6
°
C] above room temperature. Cooling and fan should
stop immediately.
RECALIBRATION
These thermostats are calibrated at the factory and should
not need recalibration. If the thermostat seems out of ad-
justment, first check for accurate leveling. To check cali-
bration, proceed as follows:
1. Move the temperature setting lever to the low end of
the temperature scale.
2. Remove the thermostat cover. Move the setting lever
until the switch just makes contact. The mercury in the
switch will drop to the contact end of the tube.
3. Replace the cover and wait five minutes for the cover
and the thermostat to lose the heat it has gained from your
hands. If the thermometer pointer and the setting lever
indicator read approximately the same, no recalibration is
needed.
If recalibration appears necessary, proceed as follows:
1. Place the temperature setting lever at the same setting
as the thermometer. Remove cover.
2. Insert 104994A Calibration Wrench (order separately)
onto the hex nut under the coil. See Fig. 7. Holding the
setting lever so it does not move, turn the wrench clock-
wise
until the switch just breaks contact.
Remove wrench and replace cover.
3. Move the setting lever to a low setting. Wait at least
five minutes for temperature to stabilize.
4. Slowly move the setting lever until it reads the same
as the thermometer.
5. Remove cover. Holding the setting lever so it does
not move, reinsert wrench and carefully turn counter-
clockwise
until the mercury just rolls to the left end
of the tube, but
no
farther
.
6. Recheck calibration. Set thermostat system switch
for desired operation and replace the cover.
Fig. 7—Recalibration procedure.
CALIBRATION
WRENCH
COIL SHOWN WITHOUT
HEAT ANTICIPATOR
M2044
www.honeywell.com/yourhome
Automation and Control Solutions
Honeywell Internationals Inc.
Honeywell Limited—Honeywell Limitée
1985 Douglas Drive North
35 Dynamic Drive
Golden Valley, Minnesota 55422
Scarborough, Ontario M1V 4Z9
