Quincy Compressor 50093-103 - Manual (Page 54)

48
Vacuum Pump Fluid Filter
The fluid filter is a spin on, full flow unit with a high
efficiency, micro-fiberglass media. Replacement of the
filter requires spinning off the complete cartridge and
replacing it with a new one. USE GENUINE QUINCY
REPLACEMENT FILTERS ONLY.
The initial filter cartridge change should occur after the
first 100-200 hours of operation. During normal service,
the filter cartridge should be replaced under the following
conditions, whichever occurs first:
•
Every 1,000 hours.
•
Every fluid change.
•
After each fluid analysis sample is taken.
Vacuum Pump Air/Fluid Separator Element
The element is a one piece construction that coalesces the
fluid mist, as it passes through the filtering media, into
droplets that fall to the bottom of the separator element to
be picked up by a scavenging tube and returned to the
vacuum pump. Care must be taken in handling the
separator element to prevent it from being damaged. Any
denting may destroy the effectiveness of the filtering
media and result in excessive fluid carryover. Even a very
small hole punctured through the element will result in a
very high carryover of fluid.
The vacuum pump air/fluid separator element must be
changed for any of the following conditions, whichever
occur first:
•
As indicated by the differential pressure indicator for
the separator element.
•
When excessive fluid carryover is noted and it has been
determined the scavenging system is functioning
properly, the fluid temperature is normal, the running
fluid level is correct and the vacuum pump is not cycling
rapidly between load and unload.
•
Every 8,000 hours.
•
Any time the pressure gauge on the instrument panel
reads greater than 7 psig. Periodic checks should be
made when the fluid is up to operating temperature, the
inlet valve is full open and the system to be drawn
down is at 10 " HgV, this condition requires the
maximum horsepower input under strict vacuum pump
operating conditions. Cold fluid or pressure in the
discharge line from the air/fluid reservoir will result in an
overly high reading.
Failure to change the separator element before it exceeds
the pressure given above will result in blown or tripped
overload fuses and/or shortened electric motor life. The
pressure given above has nothing to do with the
collapsing point of the separator element but pertains only
to the motor overload limit.
In an emergency, operation can temporarily be continued
with a clogged separator by restricting the inlet to the
vacuum pump. Install a hand valve in the vacuum pump
inlet downstream of the inlet filter and adjust it until the
pressure reading on the gauge is in the green. Lock the
hand valve setting in place to prevent it from being
changed. This temporary fix will permit continued
operation but will increase the length of time it takes to
draw down the system. If steps 1 or 2 above are noted the
separator element will have to be changed.
If the unit is designed for vacuum-compressor operation
and it is to be operated this way, the factory should be
consulted for the limiting pressure levels at which the
separator element should be changed.
Fluid Scavenging System
Fluid from inside the fluid separator element is returned to
the system side of the vacuum pump rotor housing by
way of a scavenger tube positioned inside the air/fluid
separator element, through a filter screen and orifice
contained in a straight fitting mounted in the top plate of
the air/fluid reservoir and through a nylon tube to the inlet
valve. Failure to keep the orifice clean will result in
excessive fluid carryover.
Cleaning of the filter screen and orifice should be
performed for any of the following conditions, which ever
occurs first:
•
When no fluid is seen moving through the nylon
scavenging tube and the vacuum gauge reads between
1 to 20" HgV. The nylon tubing will also feel cool to the
touch if there is no flow through it.
•
When excessive fluid carryover is detected.
•
Every fluid change.
NOTE: Do not ream or change the orifice size.