RWH ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.620-IOM (DEC 12)
Page 44
LEGEND (Covers all P & I diagrams in this manual)
C COMPRESSOR
CV CHECK VALVE
DP DISCHARGE PRESSURE
FG FLOW GLASS
HV HAND VALVE
HTR HEATER
LG LEVEL GLASS
LSLL SEPARATOR LOW OIL LEVEL SHUTDOWN
M MOTOR
NV NEEDLE VALVE
OF OIL FILTER
OP OIL PRESSURE
P DEMAND PUMP
PAH HIGH DISCHARGE PRESSURE ALARM
PAHH HIGH DISCHARGE PRESSURE SHUTDOWN
PAL LOW PRESSURE ALARM
PALL LOW PRESSURE SHUTDOWN
PDAH HIGH PRESSURE DIFFERENTIAL ALARM
PDCV PRESSURE DIFFERENTIAL CONTROL VALVE
PDI PRESSURE DIFFERENTIAL INDICATOR
PDIT PRESSURE DIFFERENTIAL INDICATING TRANSMITTER
PDSLL COMPRESSOR LOW DIFFERENTIAL PRESSURE CUTOUT
PE PRESSURE TRANSDUCERS
PI PRESSURE INDICATOR
PIC PRESSURE INDICATION CONTROLLER
PM PUMP MOTOR
PS PRESSURE SWITCH CONTROL
PSV HIGH PRESSURE SAFETY VALVE
SP SUCTION PRESSURE
STR STRAINER
TAH HIGH TEMPERATURE ALARM
TAHH HIGH TEMPERATURE SHUTDOWN
TAL LOW OIL TEMPERATURE ALARM
TALL LOW OIL TEMPERATURE SHUTDOWN
TC TEMPERATURE CONTROLLER
TCV THERMAL CONTROL VALVE
TE TEMPERATURE ELEMENT
TI TEMPERATURE INDICATOR
TS TEMPERATURE SWITCH
TSH TEMPERATURE SWITCH HIGH ALARM
TW THERMOWELL
VI VI CONTROL
SB-2 INLET BEARING & BALANCE PISTON
SB-3 DISCHARGE BEARINGS & SEAL
SC-1 SLIDE VALVE - UNLOAD
SC-2 SLIDE VALVE - LOAD
SC-3 MOVEABLE SLIDE STOP
SC-4 CYLINDER DRAIN
SC-5 SUCTION PRESSURE
SC-6 DISCHARGE PRESSURE
SC-7 OIL PRESSURE IN (SB-2)
SC-8 SEAL WEEPAGE
SC-9 CLOSED THREAD PRESSURE
SC-10 SLIDE VALVE TOOL/DISCHARGE PRESSURE
SC-11 DRAIN/DISCHARGE PRESSURE
SC-12 DRAIN/SUCTION PRESSURE
SC-13 CYLINDER OIL PRESSURE
SC-14 CYLINDER VENT
SD-1 COALESCER BLEED/SUCTION PRESSURE
SL-1 LIQUID INJECTION LOW VI
SL-2 LIQUID INJECTION HIGH VI
SM-1 MAIN OIL INJECTION
SP-1 SUCTION ACCELEROMETER
SP-2 DISCHARGE ACCELEROMETER
SV-1 VAPOR INJECTION (4018 & 4021 COMPRESSOR)
ST-1 SUCTION TEMPERATURE
ST-2 DISCHARGE TEMPERATURE
PRESSURE TRANSDUCERS INDICATE:
PE-1A OIL PRESSURE (MANIFOLD)
PE-1B OIL PRESSURE (MANIFOLD)
PE-2 OIL PRESSURE BEFORE FILTER
PE-3 DISCHARGE PRESSURE
PE-4 SUCTION PRESSURE
TEMPERATURE PROBES INDICATE:
TE-1 SUCTION GAS TEMPERATURE
TE-2 DISCHARGE GAS TEMPERATURE
TE-3 LUBE OIL TEMPERATURE
TE-4 SEPARATOR OIL TEMPERATURE
SOLENOID VALVE FUNCTION:
YY-1 ENERGIZE UNLOAD SLIDE VALVE
YY-2 ENERGIZE LOAD SLIDE VALVE
YY-3 ENERGIZE INCREASE VOLUME RATIO
YY-4 ENERGIZE DECREASE VOLUME RATIO
YY-5 MAIN OIL INJECTION AIR DUMP SOLENOID
YY-6 PRELUBE SOLENOID
YY-7 SEPARATOR EQUALIZING AIR DUMP SOLENOID
YY-9 DUAL-PORT LIQUID INJECTION SOLENOID
PY-1 DISCHARGE PRESSURE CONTROL VALVE AIR DUMP
SOLENOID
PY-2 ECONOMIZER VAPOR PRESSURE CONTROL VALVE
AIR DUMP SOLENOID
PY-3 SUCTION PRESSURE CONTROL VALVE AIR DUMP
SOLENOID
CUSTOMER SUPPLIED
FRICK SUPPLIED
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