Section 6
75
DE-18 USER MANUAL
COMPRESSOR OPERATION
6.1 GENERAL
While Sullair has built into the DE-18 Series
compressor package a comprehensive array of
controls and indicators to help assure proper
operation, the user should recognize and interpret
readings which call for service or indicate the onset
of a malfunction. Before starting the unit, the user
should become familiar with the controls and
indicators their purpose, location, and use.
6.2 PURPOSE OF CONTROLS
WARNING
The minimum continuous operating pres-
sure P2 is 70 pslg (4.8 barg). The compres-
sor should not be operated below this
pressure except for short periods. The con-
troller will shut the machine down. If it is
operated continuously below 70 pslg (4.8
barg) for ten minutes.
CONTROL OR INDICATOR PURPOSE
EMERGENCY STOP SWITCH Pushing in this switch, found outside of the package, cuts power to the
controller and stops the engine.
DISCHARGE CHECK VALVE Isolates compressor from field pipework when shut down. Located
between the HP silencer/dampener and the aftercooler.
PRESSURE RELIEF VALVES Found on the discharge pipework of both LP and HP stages, vent the
compressed air to atmosphere in case of an over pressure condition.
INLET VALVE CYLINDER AND CONTROL
VALVE ASSEMBLY
The hydraulically operated butterfly valve throttles the airflow entering the
unit inlet flange - LP stage. A 4-way electric solenoid valve loads and
unloads the hydraulic actuator, in response to controller commands.
BLOWDOWN SOLENOID AND PNEU-
MATIC BLOWDOWN VALVE ASSEMBLY
The 3-way solenoid valve and pneumatic blowdown valve vents com-
pressed air (HP discharge) to atmosphere through a muffler.
DRAIN VALVES Furnished are manual backups and automatic drain valves used in the
condensate separator drain lines.
OIL PRESSURE BYPASS VALVE To maintain desired oil flow and to protect oil pump from over pressure
situations.
THERMAL VALVE This thermal valve automatically opens/closes to bypass cold oil around
the heat exchanger to ensure fast oil warmup and optimize operating
temperature.
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