White Rodgers 37-7237A Single Stage and Multi-StageConnections, malfunction indication

WIRING DIAGRAMS

Heat Pump Connections

If you do not have a heat pump system, refer to figures 4-6. Refer to equipment manufacturers’ instructions for specific system wiring information.

You can configure the thermostat for use with the following heat pump systems.

Figure 3 – Heat Pump Systems

HEAT PUMP TYPE 1 (HP 1). Single stage compressor system; gas or electric backup.

HEAT PUMP TYPE 2 (HP 2). Multi-stage compressor or two compressor system with gas or electric backup.

After wiring, see INSTALLER CONFIGURATION section for proper thermostat configuration.

Jumper

Jumper

L

O/B

Y

Y2

W/E

W2

G

RH

RC

C

System

O

Heat Mode

Blower/

Heat Pump 1

No

2nd Stage.

Energized in

Emergency

Circulator

(HP1)

Output

Fault Indicator

Cool Mode

Heat and

Mode 2nd

Fan Energized

Optional*

Emergency

24 Volt

or System

Cool Mode

Stage

on Call for

24 Volt

24 Volt

Malfunction

B

1st Stage

Mode

Heat or Cool.

(Hot)

(Hot)

(Com-

Heat Mode

Switch

Energized in

(Compressor)

2nd

1st Stage

Set Elect/Gas

Heat

Cool

mon)

Heat Pump 2

Heat, Off,

Stage

3rd Stage.

Option for

(HP2)

Emergency

(Com-

Emergency

Emergency

Mode 2nd

Mode

Mode

pressor)

Stage

Comfort Alert II Module	NEUTRAL
or Similar System
Malfunction Module	24VAC
	HOT

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.

120VAC

CLASS II

TRANSFORMER

Single Stage and Multi-Stage Connections

Refer to equipment manufacturers’ instructions for specific system wiring information.

This thermostat is designed to operate a single-transformer or two-transformer system.

You can configure the thermostat for use with the following fossil fuel systems:

Single stage (SS 1) gas, oil or electric. Multi-stage (MS 2) gas, oil or electric.

After wiring, see INSTALLER CONFIGURATION section for proper thermostat configuration.

Figure 4 – Single Stage or Multi-Stage System (No Heat Pump) with Single Transformer

Jumper

L

O/B

Y

Y2

W/E

W2

G

RH

RC

C

System

Single

O

No

Blower/

Stage 1

Fault

Energized Constantly

No Output

Circulator

Output

(SS1)

Indicator

in Cool Mode

Heat

Fan Energized

24 Volt

24 Volt

Optional*

Cool Mode

on Call for

or

Mode

Cool (and

(Hot)

(Hot)

24 Volt

System

B

1st Stage

(Com-

Multi-

Cool

1st Stage

Heat Mode

Heat if

Heat

Cool

Malfunction

mon)

Stage 2

Switch

Energized Constantly

Mode

2nd Stage

configured

in Heat, Off,

(MS2)

2nd

for Electric

Emergency

Stage

Heat)

Mode

Comfort Alert II Module

or Similar System

NEUTRAL

Malfunction Module

24VAC

HOT

*Common connection required for fault or

malfunction indication.

120VAC

CLASS II

TRANSFORMER

Figure 5 – Single Stage or Multi-Stage System (No Heat Pump) with Two Transformers

Jumper

Remove Jumper Wire

between RH & RC

L

O/B

Y

Y2

W/E

W2

G

RH

RC

C

System

Single

O

No

Blower/

Stage 1

Energized Constantly

No Output

Circulator

Output

(SS1)

Fault

in Cool Mode

Heat

Fan Energized

24 Volt

24 Volt

Optional

Indicator

B

Cool Mode

on Call for

24 Volt

(NOT

1st Stage

Mode

Cool (and

(Hot)

(Hot)

(Com-

Energized Constantly

1st Stage

Heat if

Heat

Cool

mon)

Multi-

USED)

Cool

Heat Mode

in Heat, Off,

Mode

configured

Stage 2

Emergency

2nd Stage

for Electric

2nd

(MS2)

Mode

Heat)

Stage

NEUTRAL

NEUTRAL

24VAC

120VAC

HOT

120VAC

24VAC

COOLING

HOT

HEATING

CLASS II

TRANSFORMER

CLASS II

Figure 6 – 3-Wire (SPDT) Heat Only Zone Valve Wiring

TRANSFORMER

Jumper

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.

6 Y W G RH RC C

System

Single Stage

3-wire

Zone Valve application

Closes

Valve

(6)

Opens

Valve

(4)

Blower/Circulator

Fan Energized

24Volt (Hot) Heat

(5)

24Volt (Hot) Cool

Constant

24Volt (Com- mon)

NEUTRAL
24VAC	120VAC

HOT
CLASS II
TRANSFORMER	3