Sample Wiring Diagrams
4 Wire, 1 Stage Cooling, 1 Stage Heat-Heat Pump with O reversing valve.
Residential Heat Pumps, split systems & package units, with no auxiliary heat.
Page 13
*
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).
OWNER'S MANUAL
T0140
POWER
R
REVERSING VALVE
O
COMPRESSOR
Y
4 Conductor 18 to 22 gauge
unshielded cable from the
thermostat to the equipment.
Common wire optional
*
G
FAN
O B G W Y R C
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