Section 4
OPERATION
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4.1 GENERAL
While Sullair has built into this compressor a compre-
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 w ill call for
service or indicate the beginning of a malfunction.
Before starting your Sullair compressor, read this
section thoroughly and familiarize you rself with the
controls and indicators --- their purpose, location and
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-
gine is engaged, but hold the override button for 5 to 10 sec-
onds or until the engine oil pressure reaches 20 psig (1.4
bar).
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 GAU GE 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.
FLUID LEVEL SIGHT GLAS S Monitors the fluid level in the sump. Proper level is always
centered in the sight glass. Check the level when t he com-
pressor is shut down and on level ground.
COMPRESSOR DISCHARGE TEMPERATURE Opens the electrical circuit to shut down the compres---
SWITCH sor when t he discharge temperature reaches a specific
value (see Section 3, Specifications).
THERMAL VALVE Functions as a temperature regulator directing the com-
pressor fluid either to the cooler or to the compressor unit.
MINIMUM PRESSURE/CHECK VALVE Maintains t he minimum of 55 psig (3.8 bar) in the compres-
sor sump. This valve restricts receiver air discharge from re-
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 the sump exceed 140 psig (9.7 bar) or 175 psig (12.1
bar) on 185H.
AIR INLET VALV E Regulates the a mount of air allowed to enter the air inlet
valve. This regulation is determined by a pressure signal
from the pressure regulator.
PRESSURE REGULATOR (S) Allows a pressure signal to reach the engine speed control
cylinder and the air inlet valve to control air delivery accord-
ing to demand.
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