Pro1 IAQ T855iSH - LCD Display Overview; Temperature Setpoint Buttons; Program Buttons; Fan Button Operation

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Thermostat OperationThermostat Operation
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LCD Display
Program Buttons
System Button
Temperature Setpoint Buttons
See page 6 for details about
this display readout.
Program Buttons
See pages 10-15 for
details about setting the
time and program.
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 o.
Selecting AUTO will turn the
HEAT or COOL on as needed.
(EM HEAT will appear as an
option if operating a heat
pump. EM HEAT setting will
turn on emergency heat.)
Press the or
buttons to select the
desired room temperature.
Button Door
See page 4 for further
information.
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.
Program Menu Button
Shows dierent options
during programming.
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
selected..