Sullair ES--6 Series Operator's Manual And Parts List page 19

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
5.2 PURPOSE OF CONTROLS
CONTROL OR INDICATOR
START SELECTOR SWITCH
LINE PRESSURE GAUGE
FLUID LEVEL SIGHT GLASS
COOLER BYPASS VALVE
MINIMUM PRESSURE/CHECK VALVE
DISCHARGE TEMPERATURE SWITCH
PRESSURE RELIEF VALVE
AIR PRESSURE SWITCH
SOLENOID VALVE
SUMP PRESSURE SWITCH
(Not used on current models except
with Wye--Delta starter).
DISCHARGE TEMPERATURE GAUGE
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.
PURPOSE
The three--position switch provides selection between
MANUAL/START, OFF/RESET and AUTO--MATIC/
START (for further description, see Section 2).
Continually monitors service line air pressure.
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 OVERFILL.
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 and start--up.
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.
Shuts the compressor down when the compressor dis-
charge temperature exceeds 240 F (116 C).
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.
Senses service line pressure. When line pressure
reaches maximum setting, the pressure switch opens
solenoid valve circuit to unload the compressor.
Vents sump pressure through inlet control valve to the
atmosphere during unload conditions and shutdown.
Senses sump pressure and prevents compressor from
starting until sump pressure has fallen below preset
pressure of 10 psig (0.7bar).
Continually monitors discharge temperature of the
compressor.
Section 5
OPERATION
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