Sullair LS20 Operator's Manual And Parts List page 16

Section 2
DESCRIPTION
Figure 2-5A Control System with Supervisor Controller
discontinue applying pressure to the inlet valve,
and allow the compressor to continued with the
start mode.
FULL LOAD MODE - 50 TO 100 PSIG (3.4 TO 6.9
BAR)
When the compressed air pressure rises above 50
psig (3.4 bar), the minimum pressure valve opens
allowing compressed air to flow into the service
line. From this point on, the line air pressure is con-
tinually monitored by the Supervisor. The pressure
10
regulator and the solenoid valve remain closed dur-
ing this phase. The inlet valve is in the fully open
position as long as the compressor is running at
100 psig ( 6.9 bar) or below.
MODULATING MODE (STANDARD CONTROL) -
100 TO 110 PSIG (6.9 TO 7.6 BAR)
If less than the rated capacity of compressed air is
being used, the line pressure will rise above 100
psig (6.9 bar), and a pressure regulator starts feed-
ing an air signal to close the inlet poppet valve,
throttling the mass of air entering the compressor