5
Thermostat mounting
1. Push excess wire back into the wall
opening.
2. Close the base plate door. It should
remain closed without bulging.
3. Align the base plate with the thermostat,
and push gently until the thermostat
snaps in place.
4. Turn the power on at the breaker box or
switch.
System operation settings
1. Press Menu, and then press the Mode
(+) button to cycle to the next available
System mode.
2. Cycle through the modes until the desired
System mode is displayed, and then press
Done.
NOTE: Available System modes vary by
model and system settings.
System modes:
‒ Auto: Thermostat selects heating or cooling as needed.
‒ Heat: Thermostat controls only the heating system.
‒ Cool: Thermostat controls only the cooling system.
‒ Em heat (PSTSN21AWH only): For heat pumps with auxiliary heat.
Thermostat controls auxiliary heat. Compressor is not used.
‒ Off: Heating and cooling system is off. Fan will still operate if fan is set to
On.
NOTE: Heat On/Cool On may flash for 5 minutes due to compressor protection.
Fan operation settings
1. Press Menu, and then press the
Fan (-) button to cycle to the next
available Fan mode.
2. Cycle through the modes until the
desired Fan mode is displayed, then
press Done.
NOTE: Available Fan modes vary with
system settings.
Fan modes:
‒ Auto: Fan runs only when the
heating or cooling system is on.
‒ On: Fan is always on.
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