46
WIRING DIAGRAMS (52P AND 52C) (cont)
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 < 20° F, then ‘CR’ is forced OFF until IFT is > 50° 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
COMPONENT LEGEND
Component Connection (Marked) FM — Fan Motor ST — Start Thermistor
Component Connection (Unmarked) HTR — Heater TRANS — Transformer
Terminal Board Connection IFT — Indoor Frost Thermostat PCBD — Printed Circuit Board
Field Splice OFT — Outdoor Frost Thermostat — HR1 — Heater Relay
Field Control Wiring OL — Overload — HR2 — Heater Relay
Accessory or Optional Wiring PLS — Primary Limit Switch —CR — Compressor Relay
To Indicate Common Potential Only Not To Represent Wire RVS — Reversing Valve Solenoid —FR — Fan Relay
CAP — Capacitor SLS — Secondary Limit Switch —RVR — Reversing Valve Relay
COMP — Compressor SSS — Speed Selector Switch
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.
52PQ and 52CQ — Typical Wiring Schematic for Wall Thermostat Control Heat Pump Units
