Honeywell RTH6450D1009/A Manual De Usuario

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

Heat

M28408

Set Clock/Day/

Schedule

Auto

Cool