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PRO TH4110B Programmable Thermostat
7
System switch
The
SSYYSSTTEEMM
switch can be set to con-
trol your heating or cooling system,
depending on the season.
•
HHeeaatt::
Thermostat controls only
the heating system.
•
CCooooll::
Thermostat controls only
the cooling system.
•
OOffff::
Heating and cooling
systems are off.
Set
SSYYSSTTEEMM
switch to control the heating or
cooling system.
CAUTION: EQUIPMENT DAMAGE
HAZARD. To prevent possible
compressor damage, do not operate
cooling system when outdoor
temperature is below 50°F (10°C).