Section 2
DESCRIPTION
9
vacuum system at 12 psig (83kPa). A temperature
switch will shut the vacuum system down if the dis-
charge temperature reaches 235ºF (113ºC).
A Carbon rupture disk will open if the sump pres-
sure reaches 15 psig (103kPa). If this happens,
rupture disk must be replaced.
Fluid is added to the sump via a capped fluid filler
opening, placed low on the tank to prevent overfill-
ing the sump. A bull’s-eye sight glass enables the
operator to visually monitor the sump fluid level.
DO NOT remove caps, plugs, and/or other compo-
nents when vacuum system is running.
2.6 CONTROL SYSTEM, FUNCTIONAL DESCRIP-
TION
Refer to Figure 2-4. The purpose of the VS control
system is to regulate the vacuum unit gas intake to
match the amount of gas being introduced into the
vacuum system. At a 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). The functional description of the control system
is described below in three distinct phases of vacu-
um system operation. The following descriptive text
applies to all VS-32 Series machines. For explana-
tory purposes, this description will apply 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 excepting
stated vacuums.
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 but-
terfly continues to open until the system vacuum
reaches approximately 15 in-Hg. (381mm) at which
time the vacuum system is operating at full capaci-
ty.
NORMAL OPERATING MODE - 15 TO 20 IN-HG.
(381 TO 508MM)
When the system vacuum rises above 15 in-Hg.
(381mm), the inlet butterfly valve is open and gas is
drawn from the system at full capacity of the vacu-
um unit. From this point on, the system vacuum is
continually monitored by a vacuum gauge. The vac-
uum regulator remains closed during this phase,
Figure 2-4 Control System
START
FULL LOAD
MODULATION
KEY NO. DESCRIPTION QTY
1 VACUUM REGULATOR VALVE 1
2 SULLICON CONTROL 1
3 ORIFICE 1
4 CHECK VALVE 1
5 VACUUM PUMP 1
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