Section 4
OPERATION
25
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 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 and indicators --- their purpose, location and
use.
4.2 PURPOSE OF CONTROLS
CONTROL OR INDICATOR
PURPOSE
ENGINE SWITCH
Press this switch to the “ ON” (ignition) position to energize
the electrical system of the compressor. Press the switch to
the “START” position to momentarily engage the starter
and start the compressor. Pressthe switch to the “OFF”
position to shut the compressor down. This switch is lo-
cated on the instrument panel.
COLD WEATHER STARTING AID BUTTON
Push this button, prior to compressor start---up, to allow the
engine to warm---up for easy starting.
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.
FLUID LEVEL SIGHT GLASS
Monitors the fluid level in the sump. Proper level is visible
halfway up 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
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 DEVICE
Maintains the minimum of 85 psig (5.9 bar) in the compres-
sor sump.
PRESSURE RELIEF VALVE
Opens sump pressure to the atmosphere should pressure
inside the sump exceed 200 psig (13.8 bar) .
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.
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.
SHUTDOWN SYSTEM/ANNUNCIATOR MODULE (SSAM) Monitors the compressor safety system for shut-
down conditions. The annunciator module on the instru-
ment panel will flash a code indicating the reason for com-
pressor shutdown.
Summary of Contents for 185H
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