52C,P

SERIES

TYPICAL THERMOSTAT INTERFACE

T’STAT OUTPUT:

RC CONTROLER OUTPUT:

UNIT OPERATION:

‘G’ — 24 VAC

‘FR’ — LINE VAC

FAN

‘G’ — 0 VAC

‘FR’ — 0 VAC

 

‘Y’ — 24 VAC

‘HR1 & HR2’ — LINE VAC

HEATING

‘O’ — 0 VAC

‘RVR’ — LINE VAC

 

‘W’ — 24 VAC

‘HR1 & HR2’ — LINE VAC

HEATING

‘Y’ — 24 VAC

‘CR’ — LINE VAC

COOLING

‘O’ — 24 VAC

‘RVR’ — 0 VAC

 

‘R’ — 24 VAC

‘R’ — 24 VAC OUTPUT

POWER TO WALL

‘C’ — COMMON

‘C’ — COMMON

THERMOSTAT

1.If ‘W’ is ON, then ‘FR’ is forced ON (regardless of ‘G’) & ‘CR’ is forced OFF.

2.If ‘Y’ is ON, then ‘FR’ is forced ON (regardless of ‘G’).

3.If IFT (indoor coil) is < 35° F, then ‘CR’ is forced OFF until IFT is > 39° F.

 

 

 

COMPONENT LEGEND

 

 

 

 

 

 

 

 

 

 

 

 

Component Connection (Marked)

HTR

Heater

 

 

IFT

Indoor Frost Thermostat

 

 

 

 

 

 

Component Connection (Unmarked)

NEC

National Electrical Code

 

 

OFT

Outdoor Frost Thermostat

 

 

 

 

 

 

Terminal Board Connection

OL

Overload

 

 

 

 

PCBD

Printed Circuit Board

 

 

Field Splice

HR1

Heater Relay

 

 

Field Control Wiring

HR2

Heater Relay

 

 

CR

Compressor Relay

 

 

Accessory or Optional Wiring

FR

Fan Relay

 

 

RVR

Reversing Valve Relay

 

 

To Indicate Common Potential Only

PLS

Primary Limit Switch

 

 

RVS

Reversing Valve Solenoid

 

 

Not To Represent Wire

 

 

SLS

Secondary Limit Switch

 

 

 

 

CAP

Capacitor

SSS

Speed Selector Switch

COMP

Compressor

ST

Start Thermistor

FM

Fan Motor

TRANS

Transformer

NOTES:

1.Recommended for use on grounded power supply only.

2.Compressor and fan motor thermally protected.

3.Use copper conductors only.

4.All wiring must conform with NEC and local codes.

5.Dashed lines indicate components when used.

6.Field control wire suitable for NEC class 2 control circuit, at 24 volts.

7.OFT determines whether to bring on compressor heat or electric heat.

FIGURE 69 — 52CQ AND 52 PQ — TYPICAL WIRING SCHEMATIC FOR

WALL THERMOSTAT HEAT PUMP UNITS

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Carrier P, 52C manual Component Legend