Sullair LS-25 Operator's Manual And Parts List page 38

Section 5
OPERATION
5.2 PURPOSE OF CONTROLS- ELECTRO-MECHANICAL (CONTINUED)
CONTROL OR INDICATOR
-BLINKING RED LED (CONT.)
"RUN STATUS" RED LED
FLUID LEVEL SIGHT GLASS
SEPARATOR RETURN LINE SIGHT GLASS
FLUID STOP VALVE
DISCHARGE CHECK VALVE
THERMAL VALVE
MINIMUM PRESSURE/CHECK VALVE
COMPRESSOR DISCHARGE
TEMPERATURE SWITCH
HIGH PRESSURE SHUTDOWN SWITCH
WATER PRESSURE SWITCH
(water-cooled compressors only)
PRESSURE RELIEF VALVE
SULLICON CONTROL
32
PURPOSE
at any moment without any more user intervention.
Indicates when controls are in "AUTO" mode.
Monitors fluid level in the sump. Proper level should show
half-full in the sight glass. Check the level when the com-
pressor is shut down. DO NOT OVERFILL.
Used to indicate fluid flow in the return lines. When the com-
pressor is running at full load, fluid flow should be visible in
the primary sight glass with a very slight film in the second-
ary sight glass. There may be little or no flow when the com-
pressor is running unloaded, but a sluggish flow at full load
indicates a need to clean the return line strainer.
Cuts off flow of fluid to compressor unit at compressor shut-
down and allows flow of fluid to the unit on start-up.
Cuts off the reverse flow of air/fluid mixture through com-
pressor discharge system at compressor shutdown.
Regulates flow of fluid to and around the cooler. Designed to
maintain a minimum operating temperature of 180°F (82°C)
(195°F [91°C] for 24KT water-cooled models); used for fast
warm-up on start-up.
Maintains minimum of 50 psig (3.4 bar) in the compressor
sump. Valve piston restricts receiver air discharge from re-
ceiver/sump when pressure falls to 40 psi (2.8 bar). Prevents
line pressure backflow into the sump during unload condi-
tions and after shutdown.
Designed to shut the compressor down when the discharge
temperature reaches 240°F (115°C).
An added protective device designed to shut down the com-
pressor when the pressure becomes too high. This switch is
set for shutdown at approximately 135 psig (9.3 bar). When
resetting, pressure is 100 psig (6.9 bar) or 25 psi (1.7 bar)
above operating pressure.
Prevents compressor operation if water pressure is too low.
Standard setting is 15 psig (1.03 bar).
Opens sump pressure to the atmosphere should pressure in-
side the sump become too high (200 psig [13.8 bar]).
Operation of this valve indicates that the high pressure
switch is either faulty or out of adjustment.
Regulates the amount of air allowed to enter the air inlet
valve. This regulation is determined by the amount of air