Figure 2-1. Refrigeration Compressor Unit P&Id (Thermosyphon Oil Cooling With Single Oil Filter Shown) - Emerson VILTER VSS Installation, Operation And Service Manual

Section 2 • Theory of Operation
needle valve (7), this will allow oil dripping off the co-
alescing filters to be fed back to the compressor.
This is a continuous cycle.
R717 VAPOR
TO ATMOSPHERE
1
DRAIN
PI
PT
001
001
12
BLEED
SUCTION
STOP VALVE
LOW PRESSURE
R717 VAPOR INLET
(Thermosyphon Oil Cooling with Single Oil Filter Shown)
VSS/VSR/VSM/VSH/VSSH Compressor • Installation, Operation and Service Manual • Emerson • 35391S
250#
PI
PT
002
002
BLEED
V100
OIL SEPARATOR
LG
001
LG
002
TW
TW TW TW
750W 750W 750W
QE QE QE TE
001 002 003 005
10
11
TE TW
004
SUCTION
CHECK VALVE
FG
001
TE TW
001
OIL CHARGE
9
D100
MOTOR
C100
D102
COMPRESSOR
CAPACITY
Figure 2-1. Refrigeration Compressor Unit P&ID
2
DISCHARGE CHECK VALVE DISCHARGE STOP VALVE
100
PSID
OPTIONAL
MW
(STANDARD FOR BOOSTER &
SWING COMPRESSORS ONLY)
MOTOR AND
OIL PUMP
P100
4
8
PT
003
PI
BLEED
003
DRAIN
7
6
PT
004
D103
PI
VOLUME
BLEED
004
HIGH PRESSURE
R717 VAPOR OUTLET
3
TE
002
TW
5
R717 LIQUID/VAPOR
E100
T
OUTLET
R717 LIQUID
INLET
2 – 3