General; Purpose Of Controls - Sullair LS-20T Operator's Manual

5.1 GENERAL

While Sullair has built into this compressor a com-
prehensive array of controls and indicators to as-
sure you that it is operating properly, you will want
to recognize and interpret the reading which will call

5.2 PURPOSE OF CONTROLS

CONTROL OR INDICATOR
EMERGENCY STOP SWITCH
FLUID LEVEL SIGHT GLASS
FLUID RETURN LINE SIGHT GLASSES
DISCHARGE CHECK VALVE
THERMAL VALVE
PRESSURE RELIEF VALVE (Sump)
PRESSURE RELIEF VALVE (Interstage)
TERMINAL CHECK VALVE
PILOT PRESSURE REGULATOR
SOLENOID VALVE
BLOWDOWN VALVE
for service or indicate the beginning of a malfunc-
tion. Before starting your Sullair compressor, read
this section thoroughly and familiarize yourself with
the controls and indicators -- their purpose, location
and use.
PURPOSE
Pushing in this switch, found adjacent to the Supervisor
II controller, cuts all AC outputs from the latter and de--
energizes the starter. A fault message (E STOP) is dis-
played by the Supervisor II until the button is pulled out
and the "O" pad is depressed.
Monitors fluid level in the sump. Proper level is to fill the
sight glass.
Used to indicate fluid flow in the return line. When the
compressor is running at full load, fluid flow should be
visible in these sight glasses. There may be little or no
flow when the compressor is running unloaded, but a
sluggish flow at full load indicates a need to clean the
return line strainers.
Cuts off the reverse flow of air/fluid mixture through
compressor discharge system at compressor shut-
down.
Regulates flow of fluid to and around the cooler. De-
signed to maintain a maximum operating compressor
discharge temperature of 230_F (110_C ). Used for
fast warmup on start--up.
Opens sump pressure to the atmosphere should pres-
sure inside the sump become too high (375 psig/ 25.9
bar]).
Opens inner stage to atmosphere should the pressure
become too high (140 psig/ 9.7 bar]).
NOTE
Under certain conditions, it may be desirable to
pipe the relief valve to the outside of the building
for inside installation.
Prevents line pressure backflow into the sump during
unload conditions and after shutdown.
Opens a pressure line between the sump and Sullicon
Control allowing the actuator to regulate air delivery to
air demand.
Bypasses the pressure regulator valve causing the
Sullicon Control to close the inlet butterfly valve when
the compressor reaches maximum operating pres-
sure.
Vents sump pressure to the atmosphere during unload
conditions and shutdown.
Section 5
OPERATION
15