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THERMOSTAT
T874 Thermostats are accurately calibrated at the fac-
tory. They do not have provision for field calibration.
THERMOMETER
1. Remove thermostat cover by pulling up from the
bottom of cover until it clears the locking springs.
2. Set the cover on a table near an accurate thermometer.
3. After allowing five or ten minutes for stabilization,
compare the readings. If they are the same, replace the
cover and put the system into operation. If they are differ-
ent, recalibrate the thermostat thermometer; see step 4.
4. Insert a small screwdriver in the thermometer shaft
(Fig. 13) and turn it until the thermometers read the same.
When the thermometer is calibrated, replace the cover and
place the system into operation.
NOTE: Hand heat will offset the thermometer reading.
After making each adjustment, wait five or ten minutes
for the thermometer to stabilize before comparing.
Home and Building Control
Honeywell Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Printed in U.S.A.
Calibration
Home and Building Control
Honeywell Limited—Honeywell Limitée
740 Ellesmere Road
Scarborough, Ontario
M1P 2V9
8
Fig. 13—Thermometer calibration.
Helping You Control Your World
M5070
QUALITY IS KEY
www.honeywell.com/yourhome
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