Quincy Compressor 50093-103 - Manual (Page 47)

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! CAUTION !
Any piping, valves etc. which are attached to the
vacuum pump inlet must be clean so as to prevent
debris from entering the vacuum pump inlet and
causing damage.
Adjustments begin and proceed as follows:
1.) Check the fluid level in the air/fluid reservoir.
2.) Be certain that the discharge piping is unobstructed.
3.) Turn the regulator adjustment screw completely into
the regulator body.
4.) Open the hand valve at the vacuum pump inlet
completely.
5.) Start the vacuum pump.
6.) Gradually close the hand valve at the vacuum pump
inlet until 10" HgV is showing on the vacuum gauge
in the vacuum pump control panel.
7.) Allow the vacuum pump to come up to operating
temperature (180°F – 210°F).
8.) Continue to gradually close the inlet hand valve until
the vacuum switch trips on increasing vacuum. The
trip point is most easily detected by placing the hand
on the solenoid valve and feeling when the solenoid
valve snaps open.
9.) Without changing the hand valve setting, the vacuum
pump inlet valve should open and close as activated
by the solenoid which receives its signal from the
vacuum pressure switch. As the inlet valve opens and
closes read the maximum and minimum vacuum levels
on the vacuum gauge and figure the differential as
explained above.
10.) If the differential is to be increased, the differential
screw in the vacuum switch must be turned in and
vice versa if the differential is to be reduced. Note that
in making the differential adjustment the minimum
vacuum level point (lower set point) does not change,
only the maximum level point (upper set point). When
increasing the differential it may be necessary to
further close the inlet hand valve to maintain better
control of the cycling of the inlet valve.
11.) Adjust the range in which the vacuum pump is to
operate by turning the range adjustment nut in the
vacuum switch, this will not change the differential
set in the previous steps. Tightening the nut against
the spring "I increase the range (raise the vacuum
level) or loosening the nut will decrease the range
(lower the vacuum level). It may be necessary to open
the hand inlet valve until a vacuum level below the
lower trip point (lower set point) is obtained.
Adjust the vacuum regulator as follows:
a.) Adjust the hand inlet valve to hold the lower set
point without the vacuum pump cycling.
b.) Remove the 0.078' orifice from the inlet valve air
cylinder.
c.) Carefully insert a blunt probe into the hole where
the 0.078" orifice was, being certain that the probe
can move in and out freely, and insert to a depth
where the blunt end of the probe lightly makes
contact with the diaphragm in the air cylinder.
d.) Back out the vacuum regulator adjustment screw
until the diaphragm in the air cylinder begins to
move which will be detected by the probe starting
to move in as light contact is maintained with the
diaphragm.
e.) Hold the vacuum regulator adjustment screw so
that it does not move from step "D' and tighten the
locknut on the adjustment screw.
f.) Cycle the vacuum pump above and below the lower
set point with the hand inlet valve to assure the
vacuum regulator setting is correct.
g.) Reinstall the 0.078" orifice.
12.) Observe temperature, vacuum and pressure gauges
closely for the first hour of operation and frequently
for the next seven hours. After the first eight hours,
temperature, vacuum, pressure, and general vacuum
pump operation should be monitored at least once in
every eight hour period. If any abnormal conditions
are observed, stop the vacuum pump and correct the
condition.