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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

* Common connection

required for fault or

malfunction indication.

TYPICAL WIRING

1F83-0422/1F85-0422

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

with Two Transformers

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)

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

Single Stage

3-wire

Zone Valve

application

Blower/Circulator

Fan Energized

Opens

Valve

(4)

Constant

24 Volt

(Com-

mon)

24 Volt

(Hot)

Cool

System

6

Y

W

C RC

CLASS II

TRANSFORMER

HOT

24VAC

NEUTRAL

120VAC

24 Volt

(Hot)

Heat

(5)

RH

G

Jumper

Closes

Valve

(6)

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.

3-Wire (SPDT) Heat Only Zone Valve Wiring

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

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