RTH3100C
Th e SYSTEM sw itch can be set to control
your heating or cooling system , depend ing
on the season.
• Cool: Cooling system control.
• O ff: All system s are off.
• H ea t: Heating system control.
• E m H e a t: Em ergency & Auxiliary H eat
control. Co m presso r is locked out.
CAUTION: EQUIPMENT DAMAGE
HAZARD. Do not operate cooling
system when outdoor temperature
is below 50°F (10°C).
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