Section 2
DESCRIPTION
13
START MODE - 0 TO 50 PSIG (0 TO 3.5 BAR)
Refer to Figures 2-5A and 2-5B. When the com-
pressor (START) pad is depressed, the sump
pressure will quickly rise from 0 to 50 psig (0 - 3.4
bar). 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 iso-
lated from the service line in this phase by the min-
imum pressure valve set at approximately 50 psig
(3.4 bar).
Closed Inlet Start- (Wye-delta or Solid-State start-
ing) applies dry-sump or service air pressure
through a solenoid valve to hold the inlet valve
closed allowing the compressor to start unloaded.
After a preset time (6-10 seconds) the controller will
discontinue applying pressure to the inlet valve, and
Figure 2-5B Control System Diagram-
START
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