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Equipment Control Module Furnace Air Conditioner
Heat Stage 2 O/B W2 W2
Heat Stage 1 W/W1
W/W1
N/A Y1 / W2 Y1
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 *
**
* Indicates connection may not be required/available.
** Option 19 set to 2.
A09127
Fig. 36 − Variable Speed, Multi−Stage, Step Modulating and Single−Stage
Furnace with Single−Stage Air Conditioner