
39
LEGEND
CAP —
Capacitor
COMP —
Compressor
CR —
Cooling Relay
EQUIP
GND
—
Equipment Ground
FM —
Fan Motor
FR —
Fan Relay
HR —
Heating Relay
IFT —
Indoor Frost Thermostat
L —
Power Supply Line
OL —
Overload
PL —
Plug
PLS —
Primary Limit Switch
52SE — Typical Wiring Schematic for Wall Thermostat Control Units
SLS —
Secondary Limit Switch
SSS —
Speed Selector Switch
ST —
Start Thermistor
TB —
Te r m i n a l B o a r d
TRANS —
Transformer
Component Connection
(Marked)
Component Connection
(Unmarked)
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.
Terminal Board Connectio
Field Ground Wiring
Field Control Wiring
Accessory or Optional Wiri
Factory Wiring
To Indicate Common
Potential Only Not to
Represent Wire
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