Section 2
DESCRIPTION
13
If equipped with option, the water-flow regulating
valve also conserves water during periods of vary-
ing load on the Vacuum System. The same valve
also shuts off the water supply when the vacuum
pump is shutdown.
On both air-cooled and water-cooled Vacuum
Systems, a portion of the fluid is routed to the anti-
friction bearings which supports the rotors inside
the vacuum unit. Prior to entering the vacuum unit,
the fluid is taken through the fluid filter, thus assur-
ing properly filtered lubricant for bearing supply and
rotor injection.
The fluid filter has a replacement element and an
integral pressure bypass valve. A gauge on the
instrument panel indicates when the filter needs
servicing.
The water-flow regulating valve also conserves
water during periods of varying load on the Vacuum
System. The same valve also shuts off the water
supply when the vacuum pump is shutdown.
A pressure switch located downstream of the fluid
filter will prevent the vacuum system from operating
if there is inadequate fluid pressure.
2.5 DISCHARGE SYSTEM, FUNCTIONAL DESCRIP-
TION
Refer to Figure 2-3. The vacuum unit discharges
compressed gas/fluid mixture into the combination
receiver/sump. The receiver has three basic func-
tions:
1) It acts as the primary fluid separator.
2) It serves as the fluid sump.
3) It houses the final fluid separator element.
The compressed gas/fluid mixture enters the sump
and is directed against the side of the tank. Its direc-
tion of movement is changed and its velocity signif-
icantly reduced, causing the larger droplets of fluid
to fall to the bottom of the sump. The fractional per-
centage of fluid remaining in the compressed gas
collects on the surface of the separator element as
the compressed gas flows through the separator. A
return line(s) (or scavenge tube) leads from the
bottom of the separator element(s) to the inlet
region of the vacuum unit. Fluid collecting on the
bottom of the separator(s) is returned to the vacu-
um unit by the pressure difference between the
receiver and the vacuum unit inlet. Sight glasses
are located in the return line(s) for the observance
of this fluid flow. A gauge located on top of the con-
trol box, indicates abnormal pressure drop through
the separator element(s). At this time, separator
element replacement is necessary.
All Sullair Vacuum Systems are equipped with a
high pressure shutdown switch to shut down the
vacuum system at 12 psig (83kPa). A temperature
switch will shut the vacuum system down if the dis-
charge temperature reaches 240ºF (115ºC).
A rupture disk will open if the sump pressure reach-
es 15 psig (103kPa).
Fluid is added to the sump via a capped fluid filler
opening, placed low on the tank to prevent overfill-
ing the sump. A sight glass enables the operator to
visually monitor the sump fluid level.
2.6 CONTROL SYSTEM, FUNCTIONAL DESCRIP-
TION
Refer to Figure 2-4. The purpose of the RSVS con-
trol system is to regulate the vacuum unit gas intake
to match the amount of gas being introduced into
the Vacuum System. At 0 to 100% of gas input, the
control system will automatically throttle the
machine and reduce the power consumption. The
Control System consists of a Sullicon Control, a
butterfly valve (located on the vacuum unit inlet)
and a vacuum regulator. The Control System will
also include a vacuum switch and solenoid valve if
the machine is equipped with dual control (option-
al).
START MODE - 0 TO 15 IN.-HG. (381MM)
When the Vacuum System START button is
depressed, the vacuum downstream of the inlet
butterfly valve will quickly rise to approximately 15
in.-Hg. at which time the butterfly gradually begins
to open. As the system vacuum is increased, the
DO NOT remove caps, plugs, or other
components when vacuum system is run-
ning.
The functional description of the Control
System is described below in four distinct
phases of Vacuum System operation. The
following descriptive text applies to all
VS-16 Series machines. It applies to a
machine with an operating vacuum level
of 20 in.-Hg. (508mm). A machine with any
other vacuum level would operate in the
same manner except for the stated vacu-
ums.
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