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RTH5100B
7 69-2330EFS—01
About your new thermostat
System
HeatAuto
Fan
System
CoolAuto
Fan
M28304
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.
• Auto: Thermostat automatically
selects heating or cooling
depending on the indoor
temperature.
• Off: Heating and cooling
systems are off.
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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