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Heat Pump 2

(HP2)

Heat Pump 1

(HP1)

O

Energized in

Cool Mode

B

Energized in

Heat, Off,

Emergency

Mode

2nd

Stage

(Com-

pressor)

No

Output

Heat and

Cool Mode

1st Stage

(Compressor)

Blower/

Circulator

Fan Energized

on Call for

Heat or Cool.

Set Elect/Gas

Option for

Emergency

Mode

Heat Mode

2nd Stage.

Emergency

Mode 2nd

Stage

Heat Mode

3rd Stage.

Emergency

Mode 2nd

Stage

Emergency

Mode

1st Stage

Optional*

24 Volt

(Com-

mon)

Fault Indicator

or System

Malfunction

Switch

24 Volt

(Hot)

Cool

System

Y

W/E

C

L

RC

CLASS II

TRANSFORMER

HOT

24VAC

NEUTRAL

120VAC

24 Volt

(Hot)

Heat

RH

Jumper

Y2

W2

G

Jumper

Comfort Alert II Module

or Similar System

Malfunction Module

O/B

TYPICAL WIRING

1F85-0477

TYPICAL WIRING DIAGRAMS

Single

Stage 1

(SS1)

Multi-

Stage 2

(MS2)

O

Energized Constantly

in Cool Mode

B

Energized Constantly

in Heat, Off,

Emergency

Mode

No

Output

Cool

Mode

2nd

Stage

Cool Mode

1st Stage

Blower/

Circulator

Fan Energized

on Call for

Cool (and

Heat if

configured

for Electric

Heat)

No Output

Heat Mode

2nd Stage

Heat

Mode

1st Stage

Optional*

24 Volt

(Com-

mon)

24 Volt

(Hot)

Cool

System

Y

G

W/E

C

L

RC

CLASS II

TRANSFORMER

HOT

24VAC

NEUTRAL

120VAC

24 Volt

(Hot)

Heat

RH

Y2

W2

Jumper

Fault

Indicator

or

System

Malfunction

Switch

System Malfunction

Module

O/B

Heat Pump Systems

NOTE: If your system

does not provide an

E connection, jumper

W2 to W/E to use the

Auxiliary Heat in the

Emergency Mode.

* Common connection

required for fault or

malfunction indication.

Single Stage or Multi-Stage System (No Heat Pump) with Single Transformer

* Common connection

required for fault or

malfunction indication.

Single Stage or Multi-Stage System (No Heat Pump) with Two Transformers

Single

Stage 1

(SS1)

Multi-

Stage 2

(MS2)

No

Output

Cool

Mode

2nd

Stage

Cool Mode

1st Stage

Blower/

Circulator

Fan Energized

on Call for

Cool (and

Heat if

configured

for Electric

Heat)

No Output

Heat Mode

2nd Stage

Heat

Mode

1st Stage

Optional

24 Volt

(Com-

mon)

Fault

Indicator

(NOT

USED)

24 Volt

(Hot)

Cool

System

Y

G

W/E

C

L

RC

CLASS II

TRANSFORMER

HOT

24VAC

NEUTRAL

120VAC

24 Volt

(Hot)

Heat

RH

120VAC

Remove Jumper Wire

between RH & RC

HOT

24VAC

NEUTRAL

CLASS II

TRANSFORMER

HEATING

COOLING

Y2

W2

Jumper

O/B

O

Energized Constantly

in Cool Mode

B

Energized Constantly

in Heat, Off,

Emergency

Mode

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