Operation Manual
22
Secondary Filter (40k Operation Only)
The secondary lter, or polishing lter, is used for
40K operation only. When operating at 40K, monitor
the lter pressure gauge (Figure 17) for an indication
of lter condition. During normal operation, the
pressure gauge should be within the 30 to 40 psi (2
to 2.75 bar) range. When differential pressure inside
the lter housing between the clean side and the
dirty side drops approximately 7 to 10 psi (0.48 to
0.69 bar), the pressure switch on the lter housing
will trip and the engine will shut off to protect the unit
from damage. Replace the dirty lter cartridge if this
occurs.
ATTENTION
Extended operation with a dirty lter will lead
to lter failure and allow debris to reach the
valves, causing damage to the valves.
It is important to know the condition of your
lter cartridge. Standard units come with a
pressure gauge on the lter. In order to mon-
itor the condition of the lter it is important to
note the engine operating speed and housing
pressure when the lter is rst changed. Refer
to “Filter Cartridge Replacement” on page
23 for more information.
Figure 17: Secondary Filter Assembly.
Pressure Gauge
Pressure Switch
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