Carrier 52S Architects And Engineers' Manual page 39

CAP — Capacitor
COMP — Compressor
CR — Cooling Relay
— Equipment Ground
EQUIP
GND
FM — Fan Motor
FR — Fan Relay
HR — Heating Relay
IFT — Indoor Frost Thermostat
L — Power Supply Line
— Overload
OL
— Plug
PL
PLS — Primary Limit 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 NEC (National Electrical Code) and local codes.
5. Dashed lines indicate components when used.
6. Control center uses thermostat part no. HH01AD045 or equivalent.
7. Field control wire suitable for NEC class 2 control circuit, at 24 volts.
52SE — Typical Wiring Schematic for Wall Thermostat Control Units
LEGEND
SLS — Secondary Limit Switch
SSS — Speed Selector Switch
ST — Start Thermistor
— Terminal Board
TB
TRANS — Transformer
Component Connection
(Marked)
Component Connection
(Unmarked)
39
Terminal Board Connection
Field Ground Wiring
Field Control Wiring
Accessory or Optional Wiri
Factory Wiring
To Indicate Common
Potential Only Not to
Represent Wire