Select System Setting - Honeywell RTH4300B Operating Manual

Operating Manual
Select the sytstem setting About your new thermostat
Set SYSTEM switch to control the
heating or cooling system.
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The SYSTEM switch can be set to control
your heating or cooling system, depending
on the season.
• Cool: Cooling system control.
• Off: All systems are off.
• Heat: Heating system control.
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CAUTION: EQUIPMENT DAMAGE
HAZARD. To prevent possible
compressor damage, do not operate
cooling system when outdoor
temperature is below 50°F (10°C).