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VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG
Section 5 • Maintenance/Service
Figure 5-4. Oil Filter Assemblies (Single and Dual)
Cover Flange
Spring Plate
Element
Canister
Spring Plate
Elements
Single Oil Filter Assembly Dual Oil Filter Assembly
Outlet
Inlet
Outlet
Element
Centering
Piece
Inlet
Canister
Cover Flange
Oil Draining
WARNING
Do not drain oil from drain valve while the compressor
unit is running. Shutdown the unit and allow pressures
to equalize to suction pressure prior to draining.
Failure to comply may result in serious injury.
The compressor unit must be shut down prior to draining
due to high pressures in the oil system, see Compressor
Unit Isolation procedure.
Draining can be performed through the drain valve lo-
cated underneath the oil separator, see Figure 5-3. A
drain valve is also provided underneath the shell and
tube oil cooler.
Draining of the remote oil cooler can be performed at
the remote oil cooler drain valves. If equipped with lower
level drains on the supply and return lines, these too can
be utilized for draining. For additional information, see
Recommended Remote Air Cooled Oil Cooler Piping in
Appendices.
Oil Filter Replacement
WARNING
Avoid skin contact with oil. Wear rubber gloves and a
face shield when working with oil. Failure to comply
may result in serious injury or death.
Change the oil fi lter as outlined in the Maintenance and
Service Interval, see Table 5-1. Maintenance & Service
Interval.
NOTE
Ensure to check the oil pressure drop and record it
daily.
If the compressor unit is equipped with only a single oil
fi lter, the compressor unit must be shut down prior to
servicing, see Stopping/Restarting procedure in Section
4.
If the compressor unit is equipped with dual oil fi lters,
then one oil fi lter can be isolated and serviced one at a
time during operation. Each oil fi lter can have single or
dual oil fi lter elements depending on the size of com-
pressor used, see Table 5-2 and Figure 5-4.
Table 5-2. Oil Filter Elements and Compressor Models
Oil Filter Element Qty. VSG/VSSG Models
Single Element 301 - 701
Dual Elements 751 - 3001
To replace an oil fi lter element, continue with the follow-
ing steps:
Parts Required:
• Oil Filter Element (VPN 1833G)
REMOVAL
NOTE
Both outlet shut-off valves should be open. If the
outlet valve is closed for the oil fi lter that is not in
operation, slowly open the outlet shut-off valve until
fully open. This will help reduce a sudden pressure
drop when switching oil fi lters for servicing.