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Quick Installation Guide
System operation settings
1
Press the Mode button to cycle to the
next available System mode.
2
Cycle through the modes until the
required 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 (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 or Circulate.
NOTE: Heat/Cool flash for 5 minutes
due to compressor protection.
Fan operation settings
1
Press the Fan button to cycle to the
next available Fan mode.
2
Cycle through the modes until the
required 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.
‒ Circ (RTH7500 Only): Fan
circulates randomly about 33% of
the time.
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