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Thermostat Operation - Pro T855i Operation Manual

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Thermostat Operation

LCD Display
See page 6 for details about
this display read out.
Glow in the dark light button
The glow in the dark light
button will self illuminate
for several hours after
exposure to ambient light.
This button turns on the
display light when pressed.
Fan Button
Select ON, AUTO or IAQ.
The ON setting will run the
fan continuously. The AUTO
setting will cycle the fan on
only when the heating or
cooling system is on. IAQ
will enable IAQ FAN MODE,
if programmed.
Thermostat Operation
System Button
Selects the operation mode
on your HVAC system.
Selecting HEAT turns on
the heat mode. Selecting
COOL turns on the cool
mode. Selecting OFF turns
both heating and cooling off.
Selecting AUTO will turn the
HEAT or COOL on as
needed. (EMHT will appear as
an option if operating a heat
pump. EMHT setting will turn
on emergency heat)
Temperature Setpoint Buttons
Press the
or
buttons to select the
desired room temperature.
Button Access Door

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