1220 User Manual

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NOTES - Conventional Systems

[1]Ifbatteriesareinstalledthe24VoltACcommonconnectionisoptional

[2]Removefactoryinstalledjumperfordualtransformersystems

[3]Indualtransformersystems,transformercommonmustcomefrom

 coolingtransformer

[4]Ifneededforsystem.

Provide disconnect and overload protection as required.

2 HEAT / 2 COOL Single or Dual Transformer (1220 Only)

Set System Type to CONV

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

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

W1 HeatRelayStage1

W2 HeatRelayStage2

Y1 CompressorRelayStage1

Y2 CompressorRelayStage2 [note 4]

G FanRelay

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

Conventional Systems (cont.)

Typical Wiring Conﬁgurations

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

Heat Pump Systems

1 HEAT / 1 COOL - No Auxiliary Heat

Set Installer Switch to HP

Rh 24VoltACPower

Rc ConnectedtoRhwithsuppliedJumperWire

O or B

 ChangeoverValve [note 2]

Y1 CompressorRelay

G FanRelay

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

2 HEAT / 1 COOL - Including Auxiliary Heat (1220 only)

Set Installer Switch to HP

Rh 24VoltACPower

Rc ConnectedtoRhwithsuppliedJumperWire

O or B

 ChangeoverValve[note 2]

CompressorRelay(1ststageheating/cooling)

W2 AuxiliaryHeatRelay(2ndstageheating)[note 3]

E EmergencyHeatRelay [note 3]

G FanRelay

C 24VoltACTransformerCommon [note1]

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User Manual - Page 5