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

 

Page 3
Image 3
White Rodgers 37-7237A specifications Single Stage and Multi-Stage Connections, Wire Spdt Heat Only Zone Valve Wiring

37-7237A specifications

The White Rodgers 37-7237A is a sophisticated thermostat designed to bring comfort and efficiency to residential heating and cooling systems. It is known for its reliability, user-friendly interface, and a variety of features that cater to the needs of modern homeowners.

One of the standout features of the 37-7237A is its digital display, which provides clear and precise temperature readings, making it easy to monitor and adjust settings. The thermostat is equipped with a simple, intuitive interface that allows for straightforward navigation through its various functions, ensuring that users can easily customize their heating and cooling preferences.

The 37-7237A supports both heat-only and cool-only systems, providing flexibility for different types of HVAC setups. It is compatible with conventional systems as well as heat pumps, making it a versatile choice for numerous household configurations. Additionally, the thermostat offers programmable capabilities, allowing users to set different temperatures for various times of the day. This feature promotes energy efficiency and helps reduce utility costs, as homeowners can lower their heating or cooling when they are not home.

Technologically, the 37-7237A incorporates advanced features such as adaptive intelligent recovery. This technology learns how long it takes to heat or cool a space to the desired temperature and begins to adjust the system's operation accordingly. As a result, the thermostat ensures that the home maintains optimal comfort without unnecessary energy expenditure.

The 37-7237A also includes a built-in temperature sensor that ensures accurate readings, helping to maintain the desired indoor climate. This consistency allows for a stable and comfortable environment, while also protecting the equipment from potential damage caused by extreme temperature fluctuations.

Another benefit of the White Rodgers 37-7237A is its energy-saving capabilities. By utilizing a programmable schedule, users can avoid heating or cooling their homes when they are not occupied. This feature can lead to significant energy savings over time.

In summary, the White Rodgers 37-7237A offers a combination of user-friendly design, advanced technology, and energy efficiency features that make it an excellent choice for homeowners seeking to enhance their indoor comfort. With its versatile compatibility and smart programming capabilities, it's an investment that pays off in both comfort and cost savings.