Section 4
OPERATION
22
4.1 GENERAL
While Sullair has built intothiscompressor acompre-
hensive array of controls and indicators to assure
you that it is operating properly, you will want to rec-
ognize and interpret the reading which will call for
service or indicate the beginning of a malfunction.
Before starting your Sullair compressor, read this
section thoroughly and familiarize yourself with the
controls andindicators --- theirpurpose, locationand
use.
4.2 PURPOSE OF CONTROLS
CONTROL OR INDICATOR PURPOSE
TOGGLE IGNITION SWITCH Turn this switch to the
“
on” position to energize the electri-
cal system of the compressor. Turn to the
“
off” position to
shut the compressor down. This switch is located on the in-
strument panel.
STARTER BUTTON Push this button along with the override button to start the
compressor. Release the starter switch as soon as the en-
gineisengaged, but holdtheoverridebuttonfor5to10sec-
onds or until the engine oil pressure reaches 20 psig (1.4
bar).
COLD WEATHER STARTING AID SWITCH (
Caterpillar
only) Push this button, prior to compressor
start---up, toallow the engine towarm---up foreasystarting.
OVERRIDE BUTTON Located on the instrument panel, it is used to bypass the oil
pressure switch when starting the engine. It must be
pressed simultaneously with pushing the starter button.
AIR PRESSURE GAUGE Continually monitors the pressure inside the receiver sump
at various load and unload conditions.
HOURMETER Indicates the accumulated hours of operation. Useful for
planning and logging service schedules.
FL UID LEVEL SIGHT GLASS Monitors the fluid level in the sump. Proper level is always
centered in the sight glass. Check the level when the com-
pressor is shut down and on level ground.
COMPRESSOR DISCHARGE TEMPERATURE Opens the electrical circuit to shut down the compres---
SWITCH sor when the discharge temperature reaches a specific
v a l u e ( see S ec tion 3 , S pec if ic ations) .
THERMAL VALVE F unctions as a temperature regulator directing the com-
pressor fluid either to the cooler or to the compressor unit.
MINIMUM PRESSURE/CHECK VALVE Maintains the minimum of 55 psig (3.8 bar) in the compres -
sorsump. This valve restricts receiver air discharge fromre-
ceiver /sump when pressure falls to 55 psig (3.8 bar); how-
ever, full flow is allowed at normal operating pressures.
PRESSURE RELIEF VALVE Opens sump pressure to the atmosphere should pressure
inside thesump exceed 140 psig(9.7bar)or175 psig(12.1
bar) on 185H.
AIR INLET VALVE Regulates the amount of air allowed to enter the air inlet
valve. This regulation is determined by a pressure signal
from the pressure regulator.
PRES SURE REGULATOR (S) Allows a pressure signal to reach the engine speed control
cylinder and the airinlet valveto control air delivery accord-
ing to demand.
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