Purpose Of Controls; Initial Start - Sullair LS-10 25HP Operators Manual And Parts Lists

Section 5
OPERATION
5.2 PURPOSE OF CONTROLS-- STANDARD ELECTRO/MECHANICAL (CONTINUED)
CONTROL OR INDICATOR
SEPARATOR RETURN LINE SIGHT GLASS
THERMAL VALVE
MINIMUM PRESSURE/CHECK VALVE
COMPRESSOR DISCHARGE
TEMPERATURE SWITCH
WATER PRESSURE SWITCH
(water---cooled compressors only)
PRESSURE RELIEF VALVE
MODULATING INLET VALVE
PRESSURE REGULATOR
SOLENOID VALVE
PRESSURE SWITCH
BLOWDOWN VALVE
WATER REGULATING VALVE
(water---cooled only)
5.3 INITIAL START-- UP PROCEDURE-- STANDARD
ELECTRO/MECHANICAL
The following procedure should be used to make
the initial start ---up of the compressor:
1. Read the preceding pages of this manual thor-
oughly.
22
PURPOSE
Used to indicate fluid flow in the return line. When the
compressor is running at full load, fluid flow should be
visible in this sight glass. There may be little or no flow
when the compressor is running unloaded, but a slug-
gish flow at full load indicates a need to clean the re-
turn line strainer.
Regulates flow of fluid to and around the cooler. It is de-
signed to maintain a minimum operating temperature
of 180_F (82_C); use for fast warm---up on start---up.
Maintains minimum of 55 psig (3.8 bar) in the com-
pressor sump. Valve piston restricts receiver air dis-
charge from receiver/sump when pressure falls to 55
psig (3.8 bar). Also prevents backflow into the sump
during unload conditions and after shutdown.
Designed to shut the compressor down when the
discharge temperature reaches 235_F (113_C).
It prevents operation when water pressure of
compressor is inadequate.
Opens sump pressure to the atmosphere should pres-
sure inside the sump become too high. Operation of
this valve indicates that the high pressure switch is ei-
ther faulty or out of adjustment.
Regulates the amount of air allowed to enter the air
compressor. This regulation is determined by the
amount of air being used at the service line. Also acts
as a check valve to prevent reverse compressor rota-
tion at shut down.
Allows a pressure signal to reach the air inlet valve to
control air delivery according to demand.
Bypasses the pressure regulator valve causing the in-
let valve to close when the compressor reaches maxi-
mum operating pressure. Also activates blow ---down
valve.
Senses service line pressure. When line pressure
reaches maximum setting the pressure switch signals
the pilot valves to unload the compressor.
Vents sump pressure to the atmosphere during un-
load conditions and shutdown.
Regulates the amount of cooling water used to keep
the compressor running at a normal operating tem---
perature.
2. Be sure that all preparations and checks de-
scribed in the Installation Section have been
made.
3. Crack open the shut off valve to the service line.
4. Start the compressor by pushing the START but-
ton.
5. Check for possible leaks in piping.