Honeywell RTH5100 - Operate Your Thermostat; Set System Mode

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Operate Your Thermostat
Set System Setting
Press the System button to select Heat, Off or Cool:
Heat—Thermostat controls the heating system.
Off—Both the heating and cooling systems are off.
Cool—Thermostat controls the cooling system.
CAUTION
Equipment Damage Hazard.
Air conditioning compressor damage possible.
Do not operate cooling system when outdoor temperature
is below 50 °F (10 °C).
Cool
On
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N
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M22012
PRESS THE
SYSTEM BUTTON
TO SELECT HEAT,
OFF OR COOL