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52c,p series – Carrier P User Manual

Page 42

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52C,P

SERIES

42

TYPICAL THERMOSTAT INTERFACE

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.

T’STAT OUTPUT:

RC CONTROLER OUTPUT:

UNIT OPERATION:

‘G’ — 24 VAC
‘G’ — 0 VAC

‘FR’ — LINE VAC
‘FR’ — 0 VAC

FAN

‘Y’ — 24 VAC
‘O’ — 0 VAC

‘HR1 & HR2’ — LINE VAC
‘RVR’ — LINE VAC

HEATING

‘W’ — 24 VAC

‘HR1 & HR2’ — LINE VAC

HEATING

‘Y’ — 24 VAC
‘O’ — 24 VAC

‘CR’ — LINE VAC
‘RVR’ — 0 VAC

COOLING

‘R’ — 24 VAC
‘C’ — COMMON

‘R’ — 24 VAC OUTPUT
‘C’ — COMMON

POWER TO WALL
THERMOSTAT

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

Component Connection (Marked)

Component Connection (Unmarked)

Terminal Board Connection

Field Splice

Field Control Wiring

Accessory or Optional Wiring

To Indicate Common Potential Only
Not To Represent Wire

CAP

Capacitor

COMP

Compressor

FM

Fan Motor

COMPONENT LEGEND

HTR

Heater

IFT

Indoor Frost Thermostat

NEC

National Electrical Code

OFT

Outdoor Frost Thermostat

OL

Overload

PCBD

Printed Circuit Board

HR1

Heater Relay

HR2

Heater Relay

CR

Compressor Relay

FR

Fan Relay

RVR

Reversing Valve Relay

PLS

Primary Limit Switch

RVS

Reversing Valve Solenoid

SLS

Secondary Limit Switch

SSS

Speed Selector Switch

ST

Start Thermistor

TRANS

Transformer

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