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A—Alarm
C—Contactor
CB — Circuit Breaker
CH — Crankcase Heater
CM — Control Module
COM — Common
COMP — Compressor
CWFS — Chilled Water (Fluid) Flow Switch
CWP — Chilled Water (Fluid) Pump
D—Discharge
DLS — Demand Limit Switch
Fig. 19 — 30HK, HL Control Box
GCS — Ground Current Sensing
GND — Ground
HGS — Hot Gas Solenoid
HPS — High-Pressure Switch
LLSV — Liquid Line Solenoid Valve
LPS — Low-Pressure Switch
NC — Normally Closed
NEC — National Electrical Code (U.S.A.)
NO — Normally Open
OPS — Oil Pressure Switch
PL — Plug
PRI — Primary (Transformer)
S—Suction
SEC — Secondary (Transformer)
SW — Switch
T—Thermistor
TB — Terminal Block
TC — Temperature Control
TDR — Time Delay Relay
THERM — Thermistor
TRAN — Transformer
TSW — Transfer Switch
U—Unloader
LEGEND
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