keeping the Sullicon control inactive.
MODULATING MODE - 20 TO 23 IN-HG. (508 TO
584MM)
If less gas than the rated capacity of the vacuum
unit is being admitted to the system, the system
vacuum will rise above 20 in-Hg. (508mm). The
vacuum regulator valve gradually opens, applying
atmospheric air pressure through the control line to
the diaphragm chamber of the Sullicon control,
which then partially closes the butterfly valve on the
vacuum unit inlet. This reduces the amount of gas
entering the vacuum unit until it matches the
amount of gas being admitted to the system. The
control system functions continually in this manner,
between the limits of 20 to 23 in-Hg. (508 to
584mm) in response to varying demands from the
system.
DUAL CONTROL OPTION - ABOVE 23 IN-HG.
(584MM)
For a machine with varied periods of time when
there are no vacuum requirements, a "dual-control"
option is available. This option allows you to set the
machine in an automatic position whereby the
machine will shut down when no vacuum require-
ment is present and restart when the system vacu-
um decreases. This is accomplished through the
vacuum switch. When the system vacuum reaches
23 in-Hg. (584mm), the switch contacts open which
de-energize the solenoid valve. Atmospheric air
pressure is admitted to the Sullicon diaphragm
which holds the butterfly valve closed.
Simultaneously, a timing relay starts. When the tim-
ing relay is satisfied, it will shut the vacuum system
down, when the lower setting 20 in-Hg. (508mm) of
the vacuum switch is reached, and the machine will
automatically restart.
2.7 INLET SYSTEM, FUNCTIONAL DESCRIPTION
The VS inlet system consists of a dry-type inlet fil-
ter, a check valve and an inlet butterfly valve.
The butterfly-type inlet valve directly controls the
amount of gas intake to the vacuum unit in
response to the operation of the Sullicon control
(Section 2.6).
The check valve prevents discharge gas and fluid
from being drawn into the system and reverse run-
ning of the vacuum unit during shutdown.
2.8 INSTRUMENTATION, FUNCTIONAL DESCRIP-
TION
Refer to Figure 2-5A (single control), or Figure 2-5B
(dual control). The instrumentation of the vacuum
system consists of a panel group which will contin-
ually monitor the operating condition of the
machine. The gauges supplied with the machine
include an hourmeter, a discharge temperature
gauge, separator maintenance gauge, and sys-
tem vacuum gauge, and the unit vacuum inlet
gauge.
• The hourmeter records cumulative hours of
operation for the vacuum system and is use-
ful for planning/logging service operations.
Section 2
DESCRIPTION
10
Figure 2-5A Instrumentation Panel - Single Control
KEY
NO.
DESCRIPTION
KEY
NO.
DESCRIPTION
1 HOURMETER 7 STOP BUTTON
2
SYSTEM
VACUUM
GAUGE
8
POWER LIGHT
(RED)
3
VACUUM UNIT
INLET VACUUM
GAUGE
9
DISCHARGE
TEMPERATURE
GAUGE
4
FLUID
PRESSURE
GAUGE
10
FLUID FILTER
MAINTENANCE
GAUGE
5
START BUTTON
(GREEN)
11
SEPARATOR
MAINTENANCE
GAUGE
6
ON LIGHT
(GREEN)
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