Unload Mode- In Excess Of 106 Psig (7.3 Bar) - Sullair 3007 Operators Manual & Parts Lists

SECTION 7
NOTE
With a Sullair compressor, there is no
maintenance or inspection of the
internal parts of the compressor unit
permitted in accordance with the
terms of the warranty.
Unload Mode- In Excess of 106
PSIG (7.3 Bar)
When a relatively small amount or no air is being used, the
service line pressure continues to rise. When it exceeds
106 psig (7.3 bar), or alternatively set unload pressure, the
WS control system de-energizes the solenoid valve
allowing receiver tank air pressure to be supplied directly
to close the inlet valve. Simultaneously, the solenoid valve
sends a pneumatic signal to the blow down valve. The
blowdown valve opens to the atmosphere, reducing the
receiver tank pressure. The check valve in the air service
line prevents line pressure from returning to the receiver
tank . The compressor will shut down after the unload time
setting expires if programmed (the default setting is zero
[0] seconds for an immediate shutdown upon unload).
When the line pressure drops to the low setting pressure
of 100 psig (6.9 bar) The WS Controller starts the motor
and energizes the solenoid valve which closes the blow
down valve. The re-energized solenoid valve prevents line
pressure from reaching the inlet control valve, thereby
allowing it to fully open, and the compressor again delivers
compressed air to the system.
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3000-4500 Operator's Manual and Parts List
SULL AIR
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