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Section 5 • Maintenance/Service
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
Filter Element Replacement (Single Oil Filter
Assembly) and Oil Pump Strainer Servicing
WARNING
When working with refrigerants, ensure there is
adequate ventilation and refrigerant vapor detectors
as per ASHRAE standards. Failure to comply may
result in serious injury or death.
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 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.
This procedure is for a compressor unit equipped with a
single oil lter assembly only, but can be used for units
equipped with dual oil lters. The compressor unit must
be shut down prior to servicing, see Stopping/Restarting
procedure in Section 4.
See Table 5-3 for the parts required for an oil lter re-
placement, with their part numbers.
NOTE
For lter housings with drain plugs only, replace
with O-ring (VPN 3111AB) after removing drain
plug. Drain plug and O-ring are not shown in this
procedure.
Drain Oil From Isolated Oil Line
1. Isolate the compressor unit, see Compressor Unit
Isolation procedure.
2. Close oil supply valve and oil lter outlet valve to
isolate oil lter assembly and oil pump strainer for
servicing.
3. Remove plug from drain valve on oil pump strainer.
4. If needed, attach a hose with 1/4” male adapter to
drain valve to aid in controlling discharged oil.
5. Using a drain pan, slowly open drain valve to reduce
pressure and allow oil to completely drain from oil
lines and oil pump strainer.
6. Remove plug from bleed valve on oil lter housing.
7. If needed, attach a hose with 1/4” male adapter to
bleed port to aid in controlling discharged oil.
8. Using a drain pan, slowly open bleed valve and al-
low oil to completely drain from lter housing.
Remove plug from oil lter head assembly to aid in
oil removal.
KIT Oil Filter Oil Filter Element
O-Ring and Drain
Plug
Filter Type
KT773B 3111A 3109B 2176BZ Single
KT773A 3109A 3109B 2176BY Dual*
KT774** 3112A 3110B 2176BY Single
KT721 3007A 3007B 2176BU Single
KT722 3039A 3039B 2176AJ Single
Table 5-3. Oil Filter Replacement Parts Required, with their numbers
*2 Kits required
**Supplied on VSS 1501-1801 Single Screw compressor units
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