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TYPICAL WIRING

1F97-1277

Single

Stage

(SS)

Energized

in Cool

Mode

Energized

in Heat,

Off Mode

System

O

RH

+

B

CLASS II

TRANSFORMER

HOT

24VAC

NEUTRAL

120VAC

W

G

C*

-

Energized

on call

for Cool

(Com-

pressor)

Blower/

Circula-

tor Fan

Energiz-

ed on

call for

Heat or

Cool

(if ELE

is sel-

ected)

24 Volt

(Hot)

Cool

Power

remote

Temp-

erature

Sensor

Remote

Temp-

erature

Sensor

signal

Power

Remote

Temp-

erature

Sensor

Energized

on call for

Heat

Third wire

for 3-wire

zone valve

Y

RC

S

6

L

{

To Remote Temperature Sensor

24 Volt

(Hot)

Heat

24 Volt

Com-

mon

(option-

al)

CLASS II

TRANSFORMER

120VAC

HOT

24VAC

NEUTRAL

HEATING

COOLING

Diagnostic

Indicator

(See

Note

)

1

Jumper

Remove Jumper Wire

between RH & RC

Single

Stage

(SS)

Energiz-

ed in

Cool

Mode

Energized

in Heat

or Off

Mode

System

O

RH

+

B

CLASS II

TRANSFORMER

HOT

24VAC

NEUTRAL

120VAC

W

G

C*

-

Jumper

Energized

on call

for Cool

(Com-

pressor)

Blower/

Circula-

tor Fan

Energiz-

ed on

call for

Cool &

for Heat

(if ELE

is sel-

ected)

24 Volt

(Hot)

Cool

Power

Temp-

erature

Sensor

Remote

Temp-

erature

Sensor

Power

Remote

Temp-

erature

Sensor

Energized

on call for

Heat

Third

wire for

3-wire

zone

valve

Diagnostic

Indicator

(See

Note

)

Y

RC

S

6

L

{

To Remote Temperature Sensor

24 Volt

(Hot)

Heat

24 Volt

Com-

mon

(option-

al)

1

Single Stage System with Single Transformer

Single Stage with Two Transformers

* Common connection

required for fault or

malfunction indication

and remote sensor.

NOTE

: If continuous backlight or hardwired power input are de-

sired 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.

* Common connection

required for fault or

malfunction indication

and remote sensor.

NOTE

: Connection for Call for Service diagnostic indicator compatible with mechanical or electronic condenser control with Comfort Alert

TM

.

TYPICAL WIRING DIAGRAMS

www.white-rodgers.com

131

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