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 the Mode button to cycle to the next
available System mode.
2 Cycle through the modes until the desired
System mode is displayed and leave it to
activate.
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 (PSTSP21AWH only) (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.
Fan operation settings
1 Press the Fan button to cycle to the next
available Fan mode.
2 Cycle through the modes until the desired
Fan mode is displayed and leave it to
activate.
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.
5
M39339
M39341
M39342