Background Image
Previous Page  143 / 221 Next Page
Information
Show Menu
Previous Page 143 / 221 Next Page
Page Background

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)

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

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

Emergency

Mode

1st Stage

Heat Mode

2nd Stage

Heat mode

3rd Stage

Optional*

24 Volt

(Com-

mon)

Diagnostic

Indicator

or System

Malfunction

Switch

24 Volt

(Hot)

Cool

System

Y

W/E

C

L

A1

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

Energized

Pre-purge,

Morning,

Day, Eve,

Night

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 A1

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

Energized

Pre-purge,

Morning,

Day, Eve,

Night

TYPICAL WIRING

1F95-0680

Heat Pump Systems

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

* Common connection required for diagnostic or malfunction indication.

* Common connection required for diagnostic or malfunction indication.

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

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

www.white-rodgers.com

144

TECHNICAL HELP