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Equipment Control Module
Furnace Air Conditioner
Heat Stage 2 O/B W2 W2
Heat Stage 1 W/W1
W/W1
Cool Stage 1 Y1 / W2 Y1
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.
A09123
Fig. 32 − Variable Speed, Step Modulating, Multi−Stage and Single−Stage
Furnace with Two−Stage Air Conditioner