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SETTING AND ADJUSTMENT
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 T8034C features SYSTEM and FAN switches for
control of the heating-cooling and fan systems.
The SYSTEM switch controls system operation as follows:
HEAT: Heating system only operates.
OFF: Both heating and cooling systems are discon-
nected.
COOL: Cooling system only operates.
The FAN switch controls fan operation as follows:
AUTO: The fan operates in response to the thermostat
in cooling; fan operates 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. Switch lever must stop directly
over desired function indicator mark for proper circuit
operation.
Heat Anticipator Setting
IMPORTANT
The T8034C Thermostat has an adjustable heat
anticipator and will operate properly ONLY IF
THE ANTICIPATOR IS ADJUSTED TO MATCH
THE CURRENT DRAW OF THE PRIMARY
CONTROL. Use this thermostat only on systems
with current draws that fall within the range of the
heat anticipator. Do not use this device on
Powerpile (millivolt) systems.
A current rating is usually stamped in the nameplate of the
primary control. Set the adjustable heat anticipator
indicator to match the value given on the nameplate.
If current rating is not available, proceed as follows to
determine the rating:
1. Turn off power.
2. Wire thermostat, but do not mount it on the wall.
3. Connect ammeter between W wire and W terminal
on the thermostat (in series with the primary control).
4. Prepare the system for operation.
5. Turn on power.
6. Turn system switch to heat.
7. Increase thermostat setpoint as necessary to get
system operating.
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 power.
10. Adjust the heat anticipator to match the reading on
the ammeter.
11. Disconnect the ammeter, reconnect the W wire, and
mount the thermostat. Continue with system
checkout.
T8034C HEATING AND COOLING THERMOSTAT
NOTE: The heat anticipator may require further adjust-
ment for best performance. To lengthen burner-
on time, move the indicator in the direction of the
longer arrows, but not more than one-half scale
marking at a time. To shorten burner-on time,
move indicator in opposite direction.
CHECKOUT
CAUTION
Do not check operation by shorting across
terminals of system controls. This damages 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. Heating should start; fan should
start after a short delay.
Move temperature setting lever about 10°F (6°C) below
room temperature. Heating should shut off and fan should
shut off after a short delay.
Cooling
CAUTION
Do not operate cooling if outdoor temperature is
below 50°F (10°C). Refer to manufacturer's
recommendations.
NOTE: To prevent compressor short cycling, some
manufacturer equipment includes a minimum off-
timer to provide a five-minute time delay before
activating the compressor when the thermostat
last turned off the compressor, or from when 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 at
ON, the fan should run continuously. Move the fan switch
to AUTO. Fan operation is controlled by the plenum fan
control in heating and by the thermostat in cooling.
3
69-1597EF
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