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

TYPICAL WIRING

1F95-0671

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

Diagnostic

Indicator

Input

or

System

Malfunction

Switch

Input

Comfort Alert II Module

or Similar System

Diagnostic Module

See Module Instructions

for details

O/B

* Common connection required for diagnostic 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)

Diagnostic

Indicator

(Optional)

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

Heat Pump Systems

Heat Pump 1

(HP1)

Heat Pump 2

(HP2)

O

Energized in

Cool Mode

B

Energized in

Heat, Off,

Emergency

Mode

No

Output

2nd

Stage

(Com-

pressor)

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 - 3rd

Stage, Emergency

Mode - 2nd Stage

Heat Mode-4th

Stage. Emergency

Mode - 2nd Stage

Heat Mode - 2nd

Stage, Emergency

Mode - 1st Stage

Heat Mode - 3rd

Stage, Emergency

Mode - 1st Stage

Optional*

24 Volt

(Com-

mon)

Diagnostic

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

Comfort Alert II Module

or Similar System

Diagnostic Module

See Module Instructions

for details

O/B

+

Note: Dual Fuel option

de-energizes Heat mode

stage 1 (compressor)

when auxiliary heat

is energized

+

Note: Dual Fuel option

de-energizes Heat mode

stage 1 (compressor)

when auxiliary heat

is energized

+

Note: Dual Fuel option

de-energizes Heat mode

stage 1 (compressor)

when auxiliary heat

is energized

+

Note: Dual Fuel option

de-energizes Heat mode

stage 1 (compressor)

when auxiliary heat

is energized

* Common connection required for diagnostic or malfunction indication.

+

Dual Fuel option, if selected turns off compressor(s) when Auxiliary stages energize.

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