DESCRIPTION
®SULLAIR®
3700 Operator’s Manual and Parts List
11
2.6 CONTROL SYSTEM, FUNCTIONAL
DESCRIPTION
Refer to Figure 2-3. The purpose of the compressor
Control System is to regulate the amount of air being
compressed to match the amount of compressed air
being used. The Capacity Control System consists of a
solenoid valve, regulator valve and an inlet valve. The
functional description of the Control System is described
below in four distinct phases of operation. For
explanatory purposes, this description will apply to a
compressor with an operating range of 100 to 110 psig
(6.9 to 7.6 bar). A compressor with any other pressure
range would operate in the same manner except stated
pressures.
START MODE - 0 TO 50 PSIG
(0 TO 3.5 BAR)
When the compressor “ ” (START) pad is depressed,
the sump pressure will quickly rise from 0 to 50 psig (0 -
3.4 bar). The compressor initially starts unloaded with
solenoid valve open and inlet valve closed. It then
switches to full load when full rpm has been achieved.
During this period, both the pressure regulator and the
solenoid valve are closed, the inlet valve is fully open
and the compressor pumps at full rated capacity. The
rising compressor air pressure is isolated from the
service line in this phase by the minimum pressure valve
set at approximately 50 psig (3.4 bar).
Figure 2-3
1. Air Outlet
2. Pressure Regulator
3. Solenoid Valve
4. Air Inlet
5. Blowdown Valve
6. Minimum Pressure / Check Valve
7. Sump Tank
F i g u r e 2 - 3
Standard Control System
Art to Come
3
2
1
4
5
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SA_0000010
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