Honeywell Tradeline T834C Mode D'emploi page 4

CAUTION
Do not check operation by shorting across termi-
nals of system controls because this will damage
the heat anticipator.
IMPORTANT: To assure accurate temperature control,
do not touch or breathe on bimetal or thermometer.
HEATING
With system switch set at HEAT and fan switch at
AUTO, move the temperature setting lever about 10° F
[6° C] above room temperature.
Gas- or oil-fired systems—heating should start; fan
should start after a short delay.
Heat pump systems—both heating and fan should start.
Move temperature setting lever 10° F [6° C] below room
temperature.
Gas- or oil-fired systems—heating should shut off and
fan should shut off after a short delay.
Heat pump systems—heating and fan should shut off.
COOLING
CAUTION
Do not operate cooling if outdoor temperature is
below 50° F [10° C]. Refer to air conditioner
manufacturer recommendations.
NOTE: To prevent compressor short cycling, include a
minimum off-timer to provide a five minute time delay
before activating the compressor after the thermostat
last turned off the compressor, or after the system first
received power. This delay protects the compressor.
With the system switch set at COOL and fan switch at
AUTO, move the temperature setting lever about 10° F
[6° C] below room temperature. Cooling and fan should
start (see NOTE above). Move the temperature setting
lever about 10° F [6° C] above room temperature. Cooling
and fan should shut off.
FAN
With the system switch set at OFF, and the fan switch
set at ON, the fan should run continuously. Move the fan
switch to AUTO. In gas- or oil-fired systems, fan opera-
tion is controlled by the thermostat in cooling and by the
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plenum fan control in heating. In heat pump systems, fan
operation is controlled by the thermostat in both heating
and cooling.
RECALIBRATION
These thermostats are calibrated at the factory and
should not need recalibration. If the thermostat appears to
be out-of-adjustment, first check for accurate leveling.
To check calibration, proceed as follows.
1. Move the temperature setting lever to the low end of
the temperature scale. Place the system switch at 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.
2. Insert 104994A Calibration Wrench (ordered sepa-
rately) onto the hex nut under the coil, see Fig. 5 . Holding
the setting lever so it does not move, turn the wrench
clockwise until the mercury rolls to the right end of
the tube. 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 counterclock-
wise until the mercury rolls to the left end of the
tube, but no farther.
6. Recheck calibration. Set the thermostat system switch
for desired operation and replace cover.
Fig. 5—Recalibration procedure.
COIL SHOWN WITHOUT
HEAT ANTICIPATOR
CALIBRATION
WRENCH
M2044
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