1020NC User Manual

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Terminal Function Description

 Rc   Input 24VoltACCoolingTransformer

       (DualTransformerSystemsOnly)

 Rh   Input PowerConnection(24VoltACHeating

       TransformerorMillivoltPowerSource)

 O   Output ReversingValve(CoolActive)

 B   Output ReversingValve(HeatActive)

 Y1   Output 1stStageCompressor

 G   Output FanControl

 W1   Output 1stStageConventionalHeat

 C   Input 24VoltACTransformerCommon

Connect Your Wires

Wiring Terminations

Terminal Function Description

 W1/E   Output (W1)1stStageConventionalHeat

(E)EmergencyHeatRelay

 W2   Output 2ndStageHeat/AuxiliaryHeat

Additional Terminations (1220NC only)

1 HEAT / 1 COOL Single or Dual Transformer

Set Installer Switch to CONV

24VoltACPower(heatingtransformer)[note 2]

24VoltACPower(coolingtransformer)[note 2]

W1 HeatRelay(appearsasW1/Eon1220NC)

Y1 CompressorRelay

G FanRelay

C 24VoltACTransformerCommon[note 1, 3]

Typical Wiring Conﬁgurations

NOTE: The “Installer Switch” option will be conﬁgured in the next step.

Conventional Systems

Heat Only or Millivolt

Set Installer Switch to CONV

 PowerConnection

W HeatRelay(appearsasW1/Eon1220NC)

G FanRelay[note 4]

C 24VoltACTransformerCommon[note 1]

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User Manual - Page 4