PRO TH4110D / TH4210D
Set SYSTEMswitch to control the
heating or cooling system.
The SYSTEM switch can be set to control
your heating or cooling system, depend-
ing on the season.
• 0ool; Cooling system control.
+ Off; All systems are off.
+ Heat; Heating system control.
+ Em Heat; Emergency & Auxiliary
Heat control. Compressor is locked
out. (Select models only.)
CAUTION: EQUIPMENT DAMAGE
HAZARD, Do not operate cooling
system when outdoor temperature
is below 50°F (10°C).
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