Specifications

TYPICAL WIRING SCHEMATIC — 538S024 CONDENSING UNIT (024 Shown)
LEGEND
C—Contactor, Compressor
CAP — Capacitor
CLO — Compressor Lockout
COMP — Compressor Motor
CT — Current Transformer
DTS — Discharge Temperature Switch
EQUIP — Equipment
FC — Fan Coil
FCR — Fan Coil Relay
FR — Fan Relay
GND — Ground
HPS — High-Pressure Switch
LA — Low Ambient
LPS — Low-Pressure Switch
MCB — Multi-Split Control Board
OFM — Outdoor-Fan Motor
SV — Solenoid Valve
TB — Terminal Block
TH — Thermistor
TR — Transducer
TRAN — Transformer
Terminal (Field)
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
Splice
Factory Wiring
Field Control Wiring
Field Power Wiring
NOTES:
1. Fan motor is thermally protected.
2. Wire in accordance with National Electrical Code (NEC) and local codes.
Replace any original wires with 90° C wire or its equivalent.
3. The CLO locks out the COMP to prevent short cycling on COMP overloads
and safety devices. Before replacing CLO check these devices.
4. If indoor section has a transformer with a grounded secondary, connect the
grounded side to ‘‘C’’ on the low voltage board.
5. Use minimum 60° C wire for field power wiring.
6. The multi-split control has a 2-minute internal time delay on compressor op-
eration. The pins on plug P9 may be shorted to speed up this time delay for
servicing.
7. Jumper J3 must be moved to pins 1-2 when only one fan coil will be used
for compressor Circuit 1. Jumper J4 must be moved to pins 1-2 when only
one fan coil will be used for compressor Circuit 2.
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