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Section 3 • Installation
VSS/VSR/VSM/VSH/VSSH Compressor • Installation, Operation and Service Manual • Emerson • 35391S
Instrumentation Requirements
Pressure
There are four pressure transducers required to read sys-
tem pressures as listed below (see Figure 3-9):
1. Suction Pressure Transducer - (15.0 - 1000 PSIG)
measures the gas suction pressure into the compressor
housing, which provides the permissive to start at reach-
ing minimum suction pressure, and is used to detect low
suction pressure while running and in the capacity con-
trol logic.
2. Discharge Pressure Transducer - (15 – 1000 psig)
measures the discharge pressure of the process gas in
the separator, which provides detection of high dis-
charge pressure, and may also be used for capacity con-
trol logic.
3. Oil Filter Inlet pressure transducer - (15 – 1000 psig)
measures the oil pressure as it enters the oil lter canis-
ters and is used to calculate oil lter differential pressure
to provide detection of high lter differential pressure.
4. Oil Manifold pressure transducer - (15 – 1000 psig)
measures the oil pressure downstream of the oil lter as
the oil is injected into the compressor, and provides de-
tection and protection against low prelube oil pressure,
and low running oil injection pressure.
OIL SEPARATOR
OPTIONAL DUAL OIL FILTERS
STANDARD SINGLE
OIL FILTER
COMPRESSOR
FILTER
FILTER
DRAIN
DRAIN
BLEED
FILTER
BLEED
DRAIN
DRAIN
BLEED
SUCTION GAS
1/4” OIL CHARGING
1/4”
100#
DISCHARGE
STOP VALVE
MOTOR
BLEED
S
MOTOR
M
PUMP
CHECK
VALVE
TE
TE
FG
1
6
TE
7
TE
8
OPTIONAL REMOTE AIR COOLED OIL COOLER
STANDARD WATER COOLED OIL COOLER
OIL COOLER
DRAIN
VENT
OIL
DRAIN
Figure 3-9. Additional Instruments
Additional pressure transducers may be required and
installed by the customer for pressure readings at cus-
tomer specied points such as process gas discharge
pressure from the package boundary, cooling water
pressure to and/or from the oil cooler, etc.
Temperature
There are four pressure temperature readings required
for processor control, as listed below (see Figure 3-9):
5. Suction temperature RTD - measures the tempera-
ture of the incoming suction gas, and is used to provide
detection of low suction temperature when the unit is
running.
6. Discharge temperature RTD - measures the tempera-
ture of the gas/oil mixture as it is discharged from the
compressor housing, and provides detection of high
running discharge temperature.
7. Oil Separator temperature RTD - measures the tem-
perature of the oil in the separator sump, and produces
the oil temperature start permissive and detection of
low running separator temperature.
8. Oil Injection temperature RTD - measures the tem-
perature of the oil as it is injected into the compressor,
which provides detection of either high or low running
oil injection temperature.
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