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TYPICAL WIRING

1F82-0261/1F89-0211

L

R

C

24 VAC

120 VAC

Hot

SYSTEM

MONITOR

SWITCH

Neutral

THERMOSTAT

SYSTEM

G

W2

Typical wiring diagram for single transformer systems

TRANSFORMER

(Class II Current Limited)

Changeover

Relay*

Y

O/B

Compressor

Contactor

* Changeover Relay is energized in COOL when O/B switch is in the “O” position

Changeover Relay is energized in HEAT when O/B switch is in the “B” position

Aux/Emergency

Heat Relay

(Stage 2)

Fan

Relay

Optional

L

R

C

24 VAC

120 VAC

Hot

SYSTEM

MONITOR

SWITCH

Neutral

THERMOSTAT

SYSTEM

G

W2

Typical wiring diagram for two transformer systems with NO safety circuits

TRANSFORMER

(Class II Current Limited)

Changeover

Relay*

Y

O/B

Compressor

Contactor

* Changeover Relay is energized in COOL when O/B switch is in the “O” position

Changeover Relay is energized in HEAT when O/B switch is in the “B” position

Aux/Emergency

Heat Relay

(Stage 2)

Fan

Relay

Optional

Limit or

Safety

Switches

TWO COMMONS MUST

BE JUMPERED TOGETHER!

HOT

NEUTRAL

120 VAC

24 VAC

CUT AND

TAPE OFF!

If safety circuits are in

only one of the systems,

remove the transformer

of the system with

NO

safety circuits.

NOTE

TYPICAL WIRING DIAGRAMS

L

R

C

SYSTEM

MONITOR

SWITCH

G

W2

Typical wiring diagram for two transformer systems with safety circuits in BOTH systems

Changeover

Relay*

Y

O/B

Compressor

Contactor

* Changeover Relay is energized in COOL when O/B switch is in the “O” position

Changeover Relay is energized in HEAT when O/B switch is in the “B” position

Aux/

Emergency

Heat Relay

Fan

Relay

Optional

TWO COMMONS MUST

BE JUMPERED TOGETHER!

24 VAC

120 VAC

HOT

NEUTRAL

THERMOSTAT

SYSTEM

HOT

NEUTRAL

120 VAC

Limit or

Safety

Switches

Limit or

Safety

Switches

Limit or

Safety

Switches

24 VAC

Limit or

Safety

Switches

COMMON

COMMON

Auxiliary

Heating

Transformer

(Class II

Current Limited)

Heat Pump Transformer

(Class II Current Limited)

24 VAC

ACCESSORY

RELAY N.O.

CONTACT

Polarity must be observed. If the HOT side of the

second transformer is jumpered to the COMMON side

of the first transformer a short will be made. Damage

to equipment will occur when power is restored.

NOTE

The accessory relay scheme

is required when safety

circuits exist in both systems.

NOTE

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