5 – 2
VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391STG
Section 5 • Maintenance/Service
Maintaining Proper Operation
To ensure proper operation, the following items should
be checked:
• Calibrate all transducer and RTDs.
• Check capacity and volume actuator calibration.
• Check fuses in the PLC panel.
• Check for loose wiring connections in the PLC panel.
• Check relay and contact operation for relays in the
PLC panel.
• Verify the operation of the suction and discharge
check valves.
• Check for correct rotation of all motors on the pack-
age (compressor, oil pump, and fan motors).
• Check that the piping to the oil cooler is correct.
• Check setup of soft starts and VFDs.
• Verify set points in the PLC.
• Check oil heater operation.
• Verify oil line check valve is installed for correct
fl
ow .
• Check for loose bolts on the compressor unit. Tighten
any loose bolts.
Compressor Unit Isolation for
Maintenance/Service
WARNING
When working with LFG, NG or other dangerous
or
fl
ammable gases, ensure there are adequate
ventilation and vapor detectors. Refer to national
fi
re
and building codes. Failure to comply may result in
serious injury or death.
WARNING
Avoid skin contact with any condensate or oil. Wear
rubber gloves and a face shield when working with
condensate or oil. Failure to comply may result in
serious injury or death.
WARNING
At shutdown, open any other valves that may trap
liquids to prevent serious injury and/or damage to
equipment.
WARNING
Follow local lockout/tagout procedure. Failure to
comply may result in serious injury, death and/or
damage to equipment.
NOTICE
Recover or transfer all gas vapor in accordance with
local ordinances before opening compressor unit to
atmosphere.
The compressor unit must be isolated and depressurized
to atmosphere prior to servicing.
1. Shut down the compressor unit, refer to Stopping/
Restarting procedure in Section 4.
Figure 5-1. Suction By-Pass Valve Location (Manual) (1 of 2)
Suction Bypass Valve
(Manual)
View Rotate 180°
