77
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)