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SETTINGS AND ADJUSTMENTS
Temperature Setting
Push the temperature setting lever to the desired control
point on the temperature scale. The same lever controls
the temperature setting for either heating or cooling.
System and Fan Switching
The T834C has System and Fan switches to control the
heating-cooling systems and fan.
The System switch controls system operation:
Heat: Operates only heating system.
Off: Both heating and cooling systems are
disconnected.
Cool: Operates only cooling system.
The Fan switch controls fan operation:
Auto: For gas-or oil-fired systems; the fan operates in
response to the thermostat in cooling and in
response to the plenum fan control in heating.
On: The fan runs continuously.
To switch positions, use thumb and index finger to slide
lever to desired position. Stop switch lever in detent
directly over desired position. Stop switch lever in detent
directly over desired function indicator mark for correct
circuit operation.
Heat Anticipator Setting
IMPORTANT
The T834C Thermostat has an adjustable heat
anticipator and operates correctly only if the
anticipator is adjusted to match the current draw
of the primary control. Use this thermostat only
on systems with current draw that falls within
the range of the heat anticipator. Do not use this
device on Powerpile® Systems (millivolt).
Look for the current rating stamped on the nameplate of
the primary control. Set the adjustable heat anticipator
indicator to match the value shown on the nameplate.
If the current rating is not available, proceed as follows to
determine the rating:
1. Turn off the power.
2. Wire the thermostat, but do not mount it on the
wall.
T834C HEATING AND COOLING THERMOSTAT
3. Connect the ammeter between the W wire and the
W terminal on the thermostat (in series with the
primary control).
4. Prepare the system for operation.
5. Turn on the power.
6. Turn the System switch to Heat.
7. Increase the thermostat setpoint, as necessary, to
begin operating the system.
8. With the system operating through the ammeter,
wait one minute, then read the ammeter.
9. Turn the System switch to Off and turn off the
power.
10. Adjust the heat anticipator to match the ammeter
reading.
11. Disconnect the ammeter, reconnect the W wire,
and mount the thermostat.
NOTE: For best performance, the heat anticipator may
require further adjustment. To lengthen burner-
on time, move the indicator in the direction of
the longer arrows but not more than one-half
scale marking at one time. To shorten burner-on
time, move the indicator in the opposite
direction.
CHECKOUT
CAUTION
Equipment Damage Hazard.
Heat anticipator can be damaged.
Do not check operation by shorting across
system control terminals.
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 set 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.
Move the temperature setting lever about 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.
3
69-1688
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