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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

Comfort Alert II Module

or Similar System

Malfunction Module

O/B

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

1F83-0471

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

NOTE:

If continuous backlight or hardwired power input are desired but do

not function in both HEAT and COOL modes, cut the heating transformer 24V

wires and tape off. Connect the neutral circuit disconnected from the heating

transformer to the neutral circuit of the cooling transformer. Disconnect the wire

to the RH terminal and install a jumper between RH and RC. Depending on

the system requirements, replace the cooling transformer with a 75VA class II

transformer if needed.

TYPICAL WIRING DIAGRAMS

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