GE CC-SCSTAT Installation Manual page 38

34 SmartCommand Thermostat
Installation Manual
Standard HVAC system quick test
You can do a quick test of the HVAC system by shorting across the appropriate terminals on the HVAC
system's thermostat connector. Use a short 6-in. wire to connect across the terminals shown in Table 1.
Table 1. Standard system quick test
Function test
Fan
Heating
Cooling
Heat pump system quick test
You can do a quick test for heat pump operation by shorting across the appropriate terminals on the heat pump
system's thermostat connector. Note that heat pumps have an additional thermostat terminal (O) for the
changeover valve. The changeover valve determines whether heating or cooling is provided. Typical heat
pump systems have changeover with cooling and require the O terminal to be powered to get cooling
operation. Use a short 6-inch wire to connect across the terminals as shown in Table 2.
Table 2. Heat pump system quick test
Function test
Fan
Heating
Cooling
Note: If you have the CO selection incorrect, you will get cooling when you expect heating and vice versa. Change the DIP
switch SW1-2 changeover setting to correct this problem.
HVAC terminals
R to G
R to W
R to Y and G
HVAC terminals
R to G
R to Y and G
R to Y and G and O
Result
Fan should come on.
Heat cycle should start for heating.
Compressor and fan should start for cooling.
Result
Fan should come on.
Compressor and fan should start and heating occurs.
Compressor and fan should start. CO valve operates
and cooling occurs.