Section 5
OPERATION
18
5.2 PURPOSE OF CONTROLS (continued)
CONTROL OR INDICATOR PURPOSE
THERMAL VALVE Regulates flow of fluid to and around the fluid cooler. De-
signed to maintain a minimum operating temperature of
170_F(77_C); used for fast warm---up on start---up.
MINIMUM PRESSURE VALVE Maintains minimum of 40 PSIG (276kPa) in compressor
sump. This valve restricts receiver air discharge from the
receiver/sump when the pressure falls to 40 PSIG
(276kPa).
COMPRESSOR DISCHARGE Designed to shut the compressor down when the
TEMPERATURE SWITCH discharge temperature reaches 240_F (116_C).
HIGH PRESSURE SHUTDOWN SWITCH An added protective device designed to shut down the
compressor when the pressure becomes too high. This
switch is set for shutdown at approximately 135 PSIG
(930kPa).
WATER PRESSURE SWITCH Prevents compressor operation if w a ter pressure is too
(water---cooled compressors only) low. Standard setting is 15 PSIG (103kPa).
PRESSURE RELIEF VALVE Opens sump pressure to the atmosphere should pres-
sure inside the sump become too high (140 PSIG
[965kPa]). Operation of this valve indicates that the high
pressure switch is either faulty or out of adjustment.
SULLICON CONTROL Regulates the amount of air allowed to enter the air inlet
valve. This regulation is determined by the amount of air
being used at the service line.
PRESSURE REGULATOR (Sullicon) Opens a pressure line betw een the sump a nd Sullicon
Control allowing the Sullicon Control to regulate air deliv-
ery according to the air demand.
PILOT VALVE Bypasses the pressure regulator valve causing the Sul-
licon Control to close the inlet valve and open the blow-
down valve when the compressor reaches maximum op-
erating 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 unload
conditions and shutdown.
WATER REGULATING VALVE Regulates the amount of cooling water used in the
(water---cooled only) cooler to keep the compressor running at a normal
operating temperature.
LINE CHECK VALVE Prevents line pressure backflow into the separator tank
during unload conditions and after shutdown.
FLUID COOLER DEPRESSURIZATION Vents cooler pressure to the atmosphere during shut---
VALVE (air ---cooled only) down.
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