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
recognizeand 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.
5.2 PURPOSE OF CONTROLS
CONTROL OR INDICATOR PURPOSE
START SELECTOR SWITCH The three--position switch provides selection between
MANUAL/START, OFF/RESET and AUTOMATIC/
START (for further description, see Section 2).
LINE PRESSURE GAUGE Continually monitors service line air pressure.
FLUID LEVEL SIGHT GLASS Indicates fluid level. The level is checked by looking at
the fluid level sight glass on the end bell. The fluid level
should cover 1/2 to1/4 of the sight glass during opera-
tion. With the compressor shut down, the level should
be 3/4 of the sight glass.
DO NOT O VERFILL.
COOLER BYPASS VALVE Regulates fluid flow to and around the cooler. De-
signed to maintain a minimum operating temperature
of 170
_
F(77
_
C). Used for fast warm--up andstart--up.
MINIMUM PRESSURE/CHECK VALVE Maintains a minimum of 60 psig (4.1 bar) in compres-
sor sump. Valve piston restricts receiver air discharge
from receiver/sump when pressure falls to 60 psig (4.1
bar). Also incorporated in this valve is a terminal check
valve which prevents line pressure backflow into the
sump during unload conditions and after shutdown.
DISCHARGE TEMPERATURE SWITCH Shuts the compressor down when the compressor dis-
charge temperature exceeds 240
_
F(116
_
C).
PRESSURE RELIEF VALVE Opens sump pressure to the atmosphere should pres-
sure inside the sump become too high. Operation 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 the compressor.
SOLENOID 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
(Not used on current models except starting until sump pressure has fallen below preset
with Wye--Delta starter). pressure of 10 psig (0.7bar).
DISCHARGE TEMPERATURE GAUGE Continually monitors discharge temperature of the
compressor.
PRESSURE REGULATOR VALVE
Modulates the intake valve to control compressor out-
put. Senses compressor output pressure, the regula-
tor stays closed up to a pre--set pressure and then
modulates open to provide a positive control signal as
compressor pressure increases.
BALL VALVE Isolates the pressure regulator valve from standard op-
eration of the compressor. When the ball valve is in the
closed position,
selector switch settings are utilized.
Ball valve in the open position will allow operation of the
pressure regulator valve.
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