Section 5
OPERATION
15
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 for service or indicate the beginning of a mal-
function. Before starting your Sullair compressor,
read this section thoroughly and familiarize your-
self with the controls and indicators --- their pur-
pose, location and use.
5.2 PURPOSE OF CONTROLS
CONTROL OR INDICATOR PURPOSE
LINE PRESSURE GAUGE Continually monitors service line air pressure.
FL UID LEVEL SIGHT GLASS Indicates fluid level. The level is checked by looking at
the fluid level sight glass on the end bell. The fluid lev-
el should cover 1/2 to1/4 of the sight glass during op-
eration. W ith the compressor shut down, the level
should be 3/4 of the sight glass. DO NOT OVERFILL.
COOLER BYPASS VALV E Regulates fluid flow to and around the cooler. De -
signed to maintain a minimum operating temperature
of 77_C . U s e d f o r f a s t w a r m --- u p a n d s t a r t --- u p .
MINIMUM PRESSURE/CHECK VALVE Maintains a minimum of 4.1 bar in compressor sump.
V alve piston restricts receiver air discharge from re-
ceiver/sump when pressure falls to 4.1 bar. A lso incor-
porated in this valve is a terminal check valve which
prevents line pressure back flow into the sump during
unload conditions and after shutdown.
DISCHARGE TEMPERATURE SWITCH Shuts the compressor down when the compressor
discharge temperature exceeds 93_C.
PRESSURE RELIEF VALVE Opens sump pressure to the atmosphere should
pressure inside the sump become too high. Opera-
tion of this valve indicates that the air pressure switch
is either faulty or out of adjustment.
AIR PRESSURE SWITCH Senses service line pressure. When line pressure
reaches maximum setting, the pressure switch opens
solenoid valve circuit to unload t he compressor.
BLOWDOWN VALVE Vents sump pressure through inlet control valve to the
atmosphere during unload conditions and shutdown.
SUMP PRESSURE SWITCH Senses sump pressure and prevents compressor
from starting until sump pressure has fallen below
preset pressure of 0.7 bar.
DISCHARGE TEMPERATURE GAUGE Continually monitors discharge temperature of the
compressor.
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