Section 5
OPERATION
18
5.2 PURPOSE OF CONTROLS
CONTROL OR INDICATOR PURPOSE
THERMAL VALVE Regulates flow of fluid to and around the cooler. It is de-
signed to maintain a minimum operating temperature
of 180_F(82_C ) ; u s e f o r f a s t w a r m --- u p o n s t a r t --- u p .
MINIMUM PRESSURE/CHECK VALVE Maintains minimum of 55 PSIG (379kPa) in the com-
pressor sump. Valve piston restricts receiver air dis-
charge from receiver/sump when pressure falls to 55
PSIG (379kPa). Also prevents backflow into the sump
during unload conditions and after shutdown.
COMPRESSOR DISCHARGE Designed to shut the compressor down when the
TEMPERATURE SWITCH discharge temperature reaches 240_F (115_C).
HIGH PRESSURE SHUTDOWN SWITCH An added protective device designed to shut down
the compressor when t he pressure becomes too high.
This switch is set for shutdown at approximately 135
PSIG (931kPa).
WATER PRESSURE SWITCH It prevents operation when water pressure of
(water---cooled compressors only) compressor is inadequate.
PRESSURE RELIEF VALVE Opens sump pressure to the atmosphere should pres -
sure inside the s ump become too high (175 PSIG
[1206kPa]). Operation of this valve indicates that the
high pressure switch is either faulty or out of adjust-
ment.
SULLICON CONTROL Regulates the amount of air allowed to enter the air in-
let valve. This regulation is determined by the amount
of air being used at the service line.
PRESSURE REGULATOR Allows a pressure signal to reach the engine speed
control cylinder and the air inlet valve to control air de-
livery according to demand.
PILOT VALVE Bypasses the pressure regulator valve causing the
Sullicon Control to close the inlet valve when the com-
pressor reaches maximum operating pressure.
PRESSURE SWITCH Senses service line pressure. When line pressure
reaches maximum setting the pressure switch signals
the pilot valves to unload the compressor.
BLOWDOWN VALVE Vents sump pressure to the atmosphere during un-
load conditions and shutdown.
WATER REGULATING VALVE Regulates the amount of cooling water used to keep
(water---cooled only) the compressor running at a normal operating tem---
perature.
5.3 INITIAL START-- UP PROCEDURE
The follow ing procedure should be used to make
the initial start---up of the compressor:
1. Read the preceding pages of this manual thor-
oughly.
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.
6. Slowly close the shut ---off valve and check that
the setting on the pressure sw itch is set cor-
rectly. If set correctly, the compressor will unload
at the desired unload pressure. If a djustments
are necessary, see Control System Adjustments
in the Maintenance Section of the manual.
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