Honeywell RTH6400 Operating Manual page 10

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.
69-22EF—0
System
Heat
M28407
System
Cool
M28408
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: 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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