65
ES-6 USER MANUAL
Section 5
OPERATION
5.1 GENERAL
While Sullair has built into this compressor a
comprehensive array of controls and indicators to
assure you that it is operating properly, you will want
to recognize 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.
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 operation.
With the compressor shut down, the level should be 3/4 of the sight glass.
DO NOT OVERFILL.
COOLER BYPASS VALVE Regulates fluid flow to and around the cooler. Designed to maintain a minimum oper-
ating temperature of 170°F (77°C). Used for fast warm-up and start-up.
MINIMUM PRESSURE/CHECK
VALVE
Maintains a minimum of 60 psig (4.1 bar) in compressor 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 discharge temperature exceeds
240°F (116°C).
PRESSURE RELIEF VALVE Opens sump pressure to the atmosphere should pressure 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 (Not
used on current models except
with Wye-Delta starter).
Senses sump pressure and prevents compressor from starting until sump pressure
has fallen below preset pressure of 10 psig (0.7 bar).
DISCHARGE TEMPERATURE
GAUGE
Continually monitors discharge temperature of the compressor.
PRESSURE
REGULATOR VALVE
Modulates the intake valve to control compressor output. Senses compressor output
pressure, the regulator 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 operation 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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