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Equipment Control Module Furnace Heat Pump
O
RVS Cooling O/B W2 W2
Heat Stage 3
(furnace)
W/W1 W/W1 W2**
Heat/Cool Stage 1 Y1 / W2 Y1
Heat/Cool Stage 2 Y/Y2 Y/Y2 Y/Y2
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
***
* Indicates connection may not be required/available.
** Some heat pumps may designate W1.
***Option 19 set to 2.
A09121
Fig. 30 − Variable Speed, Multi−Stage, Stage Modulating and Single−Stage
Furnace with 2−Stage Heat Pump