Honeywell TH3000 Thermostat User Manual


 
PRO TH3110D / TH3210D
5
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.
Em Heat: Emergency & Auxiliary Heat
control. Compressor is locked out.
(Select models only.)
System switch
Set SYSTEM switch to control the
heating or cooling system.
CAUTION: EQUIPMENT DAMAGE HAZARD.
Do not operate cooling system when outdoor
temperature is below 50°F (10°C).