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Section 5 • Maintenance/Service
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
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.
Removal
(Reference Figure 5-11)
NOTICE
Dispose of used oil in an appropriate manner following
all Local, State and Federal laws and ordinances.
1. Pull switch lever and switch over to second lter.
2. Remove plug from bleed valve.
3. If needed, attach a hose with 1/4” male adapter
to bleed port to aid in controlling the ow of dis-
charged oil.
4. Using a drain pan, slowly open bleed valve to re-
duce pressure and allow oil to completely drain
from lter housing.
5. Remove oil lter housing cover and O-ring from oil
lter housing. Discard O-ring.
6. Remove lter element from internal port of head
assembly.
7. Clean lter element connection area of head as-
sembly and interior of lter housing.
Filter Element Replacement (Duplex Oil Filter
Assembly)
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
duplex oil lter assembly only (VPN 3109A and 3110A
oil lter housings). One oil lter can be isolated and ser-
viced one at a time during operation. Note that there
is one oil lter head assembly for both oil lters. This is
different from dual oil lters, where each oil lter has its
own oil lter head assembly.
See Table 5-3 for the parts required for an oil lter re-
placement, with their part numbers.
To replace an oil lter element, continue with the follow-
ing steps:
Figure 5-11. Duplex Oil Filter Assembly (VPN 3110A
Double Oil Filter Housing Shown)
Oil Filter
Drain Valve
Oil Filter Duplex
Head Assembly
Oil Filter
Switch Lever
Oil Filter
Housing
O-ring
Oil Filter
Housing Cover
Oil Filter
Element
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