69-0444—10
7
T834B; T834C; T834J HEATING-COOLING THERMOSTATS
Cooling
CAUTION
Damage to Compressor Possible.
Operating at too low of an outdoor temperature
may cause compressor damage.
Do not operate cooling if outdoor temperature is
below 50
°
F (10
°
C). Refer to manufacturer recom-
mendations.
NOTE:
To prevent compressor short cycling, a minimum
off-timer may be included 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, if
applicable, 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
T834B
Fan operates with the cooling equipment in cooling; fan
operates in response to the plenum fan control in heating.
T834C
With the system switch set at OFF, and the fan switch at
ON, the fan should run continuously. Move the fan switch
to AUTO. In conventional systems, fan operation is
controlled by the thermostat in cooling and by the plenum
fan control in heating. In heat pump systems, fan operation
is controlled by the thermostat in both heating and cooling.
T834J
With the system switch set at OFF, and the fan switch
at ON, the fan should run continuously. Move the fan
switch to AUTO. The fan operation is controlled by the
thermostat.
Electric Systems (with auto fan in heat)
Set adjustable anticipator to combined current draw of
heating and fan relays.
Other Systems (without auto fan in heat)
Set adjustable anticipator to current draw of heat relay
or valve.
CHECKOUT
CAUTION
Damage To Heat Anticipator Possible.
Shorting across terminals of system controls
may cause damage to the heat anticipator.
Do not check operation by shorting across
terminals of systems controls.
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, if appli-
cable, at AUTO, move the temperature setting lever about
10
°
F (6
°
C) above room temperature.
Conventional (gas, oil or central electric heat) systems:
heating should start and 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.
Conventional systems: heating should shut off and fan
should shut off after a short delay.
Heat pump systems: heating and fan should shut off.
NOTE:
Some electric heat systems require control of fan
operation from the thermostat. These systems
require a thermostat with control of fan operation
in response to a call for heating or cooling.
