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.) AI1owthe 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 maybe 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 will increase the range (raise the vacuum level)
or loosening the nut will decrease the range (lower the
vacuum level). It maybe necessary to open the hand
inlet valve until a vacuum level below the lower trip
point (lower set point) is obtained.
Acijust the vacuum regulator asfollows:
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.) Carefilly 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.
Stonr)infz the Vacuum Pump-Normal Operation
All that is normally necessary for stopping the vacuum
pump is to push the “stop” button, however, it would be
advisable to install a manual shutoff valve ahead of the
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