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Single-Stage
Equipment Control Module
Furnace Heat Pump
O
RVS Cooling O/B W2
Heat Stage 2
(furnace)
W/W1 W
W2**
Y1 / W2
Heat/Cool Stage 1 Y/Y2
Y/Y2
Y
Fan G G
24VAC Hot Heating Rh R R
24VAC Hot Cooling Rc
Dry Contact 1 D1
Dry Contact 2 D2 DHUM
24VAC Common C COM C
Humidify HUM
Outdoor Air Temp OAT
Remote Room Sensor RRS
OAT/RRS Com SRTN
Outdoor Sensor *
Humidifier Solenoid
Valve *
Remote Room
Sensor *
Y1
HUM
***
* Indicates connection may not be required/available.
** Some heat pumps may designate W1.
***Option 19 set to 2.
Heat Stage 2
A09122
Fig. 31 − Single−Stage Furnace with Heat Pump
(Hybrid Heat)