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White-Rodgers 1F83-277 Heating & Air Conditioning Auto Changeover Heat Pump Thermostat User Manual

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WIRING DIAGRAMS

NOTE

Polarity must be observed. If the HOT side of the second transformer

is jumpered to the COMMON side of the first transformer a short will

be made. Damage to equipment will occur when power is restored.

E/W1

THERMOSTAT

SYSTEM

Limit or

Safety

Switches

Limit or

Safety

Switches

HOT

Reversing

Valve

24 VAC

120 VAC

Emergency

Heat

Relay

SYSTEM

MONITOR

SWITCH

Reversing

Valve

2nd Stage

Fan

NEUTRAL

Energized in

Heat, Off,

Emergency

Mode

Compressor

Relay

24 VAC

Auxiliary

Heating

NOTE

ACCESSORY

RELAY N.O.

CONTACT

Energized in

Cool Mode

Aux

Heat

Relay

Transformer

(Class II

Current Limited)

The accessory relay scheme

is required when safety

circuits exist in both systems.

Compressor

Contactor

COMMON

TWO COMMONS MUST

BE JUMPERED TOGETHER!

Limit or

Safety

Switches

Limit or

Safety

Switches

HOT

24 VAC

120 VAC

COMMON

NEUTRAL

Heat Pump Transformer

(Class II Current Limited)

Figure 4.Typical wiring diagram for two transformer heat pump systems with safety circuits in BOTH systems

*The 24 volt neutral connection to terminal C on the thermostat is not required if you replace the batteries once a year with fresh “AA” alkaline batteries.

Heat Pump Terminal Outputs

Refer to equipment manufacturers' instructions for specific one transformer. If transformer safety circuits are in only one of

system wiring information.

the systems, remove the transformer of the system with NO

safety circuits. If required, replace remaining transformer with a

75VAClassIItransformer. Afterdisconnectingonetransformer,

the two commons must be jumpered together.

You can configure the thermostat for use with the following

heat pump system types:

HEAT PUMP TYPE 1. Single stage compressor system; gas

or electric backup.

Use the terminal output information below to help you wire the

thermostat properly for your heat pump system. After wiring,

see CONFIGURATION section for proper thermostat configu-

ration.

This thermostat is designed to operate a single-transformer

system. If you have a two-transformer system, cut and tape off

THERMOSTAT TERMINALS (HEAT PUMP)

W2 E/W1 Y2 Y1

SYSTEM

Heat

Pump 1

Fault

Indicator (Common) (Hot) 2nd stage,

or System

Malfunction

Switch

Heat and Blower/Fan Energized Energized Energized

24 Volt 24 Volt Heat Mode Emergency

Mode

Output Cool mode

1st stage

2nd

stage

compressor

on call for Heat

and Cool

(compressor) Set GAS/ELEC switch

for Emergency mode

in Cool

Mode

in Heat

OFF

Emergency 1st stage

Mode 2nd

stage

Heat

Pump 2

Emergency

mode

Heat Mode

3rd stage,

Emergency

Mode 2nd

stage

*The 24 volt neutral connection to terminal C on the thermostat is not required if you replace the batteries once a year with fresh “AA” alkaline batteries.

E/W1

THERMOSTAT

SYSTEM

Heat

Relay

Compressor

Contactor

Stage 2

Reversing

Valve

Reversing

Valve

Stage 1

Hot

120 VAC

Energized in

Heat Mode

Off Emergency

24 VAC

Energized in

Cool Mode

Compressor

Contactor

Stage 1

Heat

Relay

Neutral

TRANSFORMER

(Class II, Current Limited)

Fan

Relay

Stage 2

Figure 5.Typical wiring diagram for single transformer multi-stage systems

*The 24 volt neutral connection to terminal C on the thermostat is not required if you replace the batteries once a year with fresh “AA” alkaline batteries.

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General	Details
Name	White-Rodgers 1F83-277 Heating & Air Conditioning Auto Changeover Heat Pump Thermostat User Manual
Make	WHITE RODGERS
Language	English
Filetype	PDF (Download)
File size	0.24 MB

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