Section 5
OPERATION-
ELECTRO-MECHANICAL
20
THERMAL VALVE
MINIMUM PRESSURE/CHECK VALVE
COMPRESSOR DISCHARGE
TEMPERATURE SWITCHES
HIGH PRESSURE SHUTDOWN SWITCH
WATER PRESSURE SWITCH
(water-cooled compressors only)
PRESSURE RELIEF VALVE
SULLICON CONTROL
PRESSURE REGULATOR (SULLICON)
PRESSURE REGULATOR (SPIRAL VALVE)
SOLENOID VALVE
PRESSURE SWITCH
BLOWDOWN VALVE
WATER REGULATING VALVE
Regulates the flow of fluid to and around the cooler.
Designed to maintain a minimum operating temperature of
170ºF (77ºC); used for fast warm-up on start-up.
Maintains minimum of 50 psig (3.5 bar) in the compressor
sump when the compressor is loaded. Valve piston restricts
receiver air discharge from receiver/sump when pressure
falls to 40 psig (2.8 bar). Prevents line pressure backflow
into the sump during unload conditions and after shutdown.
Designed to shut the compressor down when the discharge
temperature reaches 240ºF (116ºC).
An added protective device designed to shut down the com-
pressor when the pressure becomes too high. This switch is
set for shut-down at approximately 135 psi (9.3 bar).
Prevents compressor operation if water pressure is insuffi-
cient.
Opens sump pressure to the atmosphere should pressure
inside the sump become too high (175 psi [12.1 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
being used at the service line.
Opens a pressure line between the sump and Sullicon
Control allowing the Sullicon Control to regulate air delivery
according to the air demand.
Opens a pressure line between the service line and the spi-
ral valve actuator allowing the spiral valve to regulate air
delivery according to air demand.
Bypasses the pressure regulator valve causing the Sullicon
Control to hold the inlet valve closed when the compressor
reaches maximum operating pressure.
Senses service line pressure. When line pressure reaches
maximum setting the pressure switch signals the solenoid
valve to unload the compressor.
Vents sump pressure to the atmosphere during unload con-
ditions and shutdown.
Regulates the amount of cooling water used in the (water-
cooled only) cooler to keep the compressor running at a
normal operating temperature.
5.2 PURPOSE OF CONTROLS (CONTINUED)
CONTROL OR INDICATOR PURPOSE
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