Operating Manual
69-2415ES—05 8
Select the system setting
Press the
SYSTEM
button to select Heat, Cool or
Off
.
•
Heat
: Thermostat controls only the heating
system.
•
Cool
: Thermostat controls only the cooling
system.
•
Off
: Heating and cooling systems are off.
•
Auto
(RTH6450 and RET95E0 only):
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).
Note:
The Auto setting may not
appear, depending on how your
themostat was installed.
M28407
Set
Clock/Day/
Schedule
Auto
Fan
System
Heat
M28408
Set
Clock/Day/
Schedule
Auto
Fan
System
Cool
