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T8034C HEATING AND COOLING THERMOSTAT
Recalibration
These thermostats are calibrated at the factory and should
not need recalibration. If the thermostat seems out of
adjustment, first check for accurate leveling.
To check calibration, proceed as follows:
1. Move the temperature setting lever to the lower end
of the temperature scale. System switch must be
placed OFF. Wait at least five minutes.
2. Remove the thermostat cover. Move the setting
lever until the switch just makes contact. The
mercury in the switch will roll to the left end of the
tube.
3. Replace 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 by
pulling outward on right edge of cover until it snaps
free of the thermostat base.
2. Insert 104994A Calibration Wrench (ordered sepa-
rately) onto the hex nut under the coil. See Fig. 4.
Holding the setting lever so it does not move, turn
the wrench clockwise
the right end of the tube. Remove wrench and
replace cover.
Automation and Control Solutions
Honeywell
1985 Douglas Drive North
Golden Valley, MN 55422
69-1597EF
69-1597EF G.H. 11-01
until the mercury rolls to
Automation and Control Solutions
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive Road
Scarborough, Ontario
M1V 4Z9
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
To assure accurate temperature control, do not touch or
breathe on bimetal or thermometer.
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
counterclockwise
left end of the tube, but no farther .
6. Recheck calibration. Set the thermostat system
switch for desired operation and replace cover.
Fig. 4. Recalibration procedure.
4
until the mercury rolls to the
COIL SHOWN WITHOUT
HEAT ANTICIPATOR
CALIBRATION
WRENCH
M2044A
www.honeywell.com/yourhome
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