A typical installation with a heat pump thermostat, air handler, and heat pump with an outdoor
thermostat.
Green
Red
White
Grey
Air Handler
Outdoor Thermostat and Air Handler
Thermostat
G R W 2 C E O Y
G
R
W
C
Typical Heat Pump with
C
O Y
Heat Pump OD
Section
E
R
W 2
9