Specifications

TYPICAL WIRING SCHEMATICS (cont)
LEGEND AND NOTES FOR TYPICAL WIRING SCHEMATICS, HIGH WALL SYSTEMS
AGING — For Burn-In Test
(short terminals)
AS — Assembly
C—Contactor
CAP — Capacitor
CH — Crankcase Heater
CLO — Compressor Lockout
CN — Connector
COMP — Compressor
CT CLO — Current Sensing Loop (Lockout)
DFB — Defrost Board
DFT — Defrost Thermostat
EMI — Electromagnetic Interference
FMC — Fan Motor Capacitor
FU — Fuse
GND — Ground
HA — Home Automation
HPS — High-Pressure Switch
IDC Th — Indoor-Coil Thermistor
IFM — Indoor-Fan Motor
JEM-A — Japan Electric Manufacturing
Industry Association
K—Relay
LLPS — Liquid Low Pressure Switch
ODA Th — Outdoor-Air Thermistor
ODC Th — Outdoor-Coil Thermistor
OFM — Outdoor-Fan Motor
OFR — Outdoor-Fan Relay
OL — Overload
PCB — Printed Circuit Board
RA Th — Return-Air Thermistor
RC — Resistor Capacitor
RCV — Receiver
RVS — Reversing Valve Solenoid
SC — Start Capacitor
SR — Start Relay
STM — Step Motor
TB — Terminal Block
TP — Thermal Protector
TRAN — Transformer
Terminal (Marked)
Terminal (Unmarked)
Splice
Terminal Block
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
NOTES:
1. If any of the original wire furnished must be replaced, it must be replaced with type 90 C wire or
its equivalent.
2. Wire in accordance with National Electrical Code (NEC) and local codes.
3. The CLO locks out the compressor to prevent short cycling on compressor overloads and safety
devices. Before replacing CLO, check these other devices. A minimum 1 amp turn is required to
hold contacts closed.
4. A thermistor wiring cable is provided with the fan coil unit.
5. Compressor and fan motors are protected by internal thermal overloads.
6. Transformer has an internal 2 amp thermal fuse on the primary side.
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