Operating Manual
Select the system setting
Fan
Set Clock/Day/
Auto
Schedule
Fan
Set Clock/Day/
Auto
Schedule
Note: The Auto setting may not
appear, depending on how your
themostat was installed.
69-2415ES—07
Press the SYSTEM button to select Heat, Cool or Off.
System
Heat
• Heat: Thermostat controls only the heating
• Cool: Thermostat controls only the cooling
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• Off: Heating and cooling systems are off.
System
• Auto (RTH6450 and RET95E0 only):
Cool
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system.
system.
Thermostat automatically selects heating or
cooling depending on the indoor temperature.
CAUTION: EQUIPMENT DAMAGE
HAZARD. To prevent possible
compressor damage, do not operate
cooling system when outdoor
temperature is below 50 °F (10 °C).
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