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Variable Speed/Multi-Stage
Equipment Control Module Furnace Heat Pump
O
RVS Cooling O/B W2 W2 W2
Heat Stage 3
(furnace)
Y1 / W2 W1
Heat Stage 2
(furnace)
W/W1 Y1
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 *
A08138
Fig. 33 -- Variable Speed/Multi--Stage Furnace w/Single--Stage Heat Pump
* Indicates connection may not be required/available.