Carrier PREMIER 52P SERIES Architects And Engineers' Manual page 46

WIRING DIAGRAMS (52P AND 52C) (cont)
TYPICAL THERMOSTAT INTERFACE
T'STAT OUTPUT: RC CONTROLER OUTPUT:
'G' — 24 VAC 'FR' — LINE VAC
'G' — 0 VAC 'FR' — 0 VAC
'Y' — 24 VAC 'HR1 & HR2' — LINE VAC
'O' — 0 VAC 'RVR' — LINE VAC
'W' — 24 VAC 'HR1 & HR2' — LINE VAC
'Y' — 24 VAC 'CR' — LINE VAC
'O' — 24 VAC 'RVR' — 0 VAC
'R' — 24 VAC 'R' — 24 VAC OUTPUT
'C' — COMMON 'C' — COMMON
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 < 20° F, then 'CR' is forced OFF until IFT is > 50° F.
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 RVS
CAP — Capacitor
COMP — Compressor
52PQ and 52CQ — Typical Wiring Schematic for Wall Thermostat Control Heat Pump Units
UNIT OPERATION:
FAN
HEATING
HEATING
COOLING
POWER TO WALL
THERMOSTAT
COMPONENT LEGEND
FM — Fan Motor
HTR — Heater
IFT — Indoor Frost Thermostat
OFT — Outdoor Frost Thermostat
OL — Overload
PLS — Primary Limit Switch
— Reversing Valve Solenoid
SLS — Secondary Limit Switch
SSS — Speed Selector Switch
46
ST — Start Thermistor
TRANS — Transformer
PCBD — Printed Circuit Board
— HR1 — Heater Relay
— HR2 — Heater Relay
— CR — Compressor Relay
— FR — Fan Relay
— RVR — Reversing Valve Relay
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
N.E.C. and local codes.
5. Dashed lines indicate compo-
nents when used.
6. Field control wire suitable for
N.E.C. class 2 control circuit,
at 24 volts.
7. OFT determines whether to
bring on compressor heat or
electric heat.