15
Sample Wiring Diagrams
4 Wire, 1 Stage Cooling, 1 Stage Heating-Heat Pump with B reversing valve.
Residential Heat Pumps, split systems & package units, with no auxiliary heat.
*Common wire is optional in all installations. If a common wire is not
used the thermostat must be powered by two AA alkaline batteries. These
batteries must be replaced (page 11) each year or when the Low Battery
indicator is displayed (page 3).
REVERSING
VALVE
B
FAN
G
COMPRESSOR
R
Y
POWER
4 Conductor 18 to 22 gauge
unshielded cable from the
thermostat to the equipment.
Common wire optional
*
C R
Y
W G B O
