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RTH110B 69-1799 2/6/05 2/3
2.3.1 2-wire Heating
2.3.2 2-wire Cooling
2.3.3 3-wire Heating
2.3.4 3-wire Cooling
2.3.5 4-wire Heating and Cooling
2.3.6 5-wire Heating and Cooling
2.4 Setting J2 Jumper
The jumper defines the fan operation when the fan is placed in auto-
matic mode.
2.5 Installing the Batteries
n Pull out the battery cover.
o Install the batteries as shown. Observe the polarity.
p Reinstall the battery cover. You will hear a clicking sound.
After the batteries are installed, the thermostat performs a series of
tests for approximately 5 seconds.
Afterwards, the screen displays the actual tempera-
ture. It is normal that the displayed temperature will
be higher than the ambient temperature if you hold
the thermostat in your hands. It will display the
ambient temperature after the thermostat is
installed on the wall. By default, the setpoint is 70°F (21°C).
2.6 Completing the Installation
n Once the baseplate and the batteries are installed, mount the
thermostat on the baseplate.
o Secure the thermostat using the locking screw and install the
faceplate.
p Apply power back to the system.
3.1 System Operating Mode
Use the selector switch to place the system in Heating
mode (HEAT) or Cooling mode (COOL), or to turn the
system off.
Note: When you place the thermostat in Cooling mode, you might need to
wait up to five minutes before cooling can start. This is a safety feature for
the compressor. will flash on the screen until cooling can start again.
Heat relay
Cool relay
Fan relay
Heat relay
Cool relay
Fan relay
Heat relay
Cool relay
Fan relay
Fan relay
Cool relay
Heat relay
HE
Use this setting if you have an electric furnace. In
this setting, when the fan is placed in automatic
mode, it works only when heating or cooling is
activated.
HG
Use this setting if you have a gas or fuel oil fur-
nace. In this setting, when the fan is placed in
automatic mode, it works as follows:
When the thermostat is placed in cool mode,
the fan works only when cooling is activated.
When the thermostat is placed in heat mode,
the fan is controlled by the furnace fan control
circuitry.
3. Basic Functions
J2 jumper
2


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