Section 5
COMPRESSOR OPERATION
22
5.9 PURPOSE OF CONTROLS -- SUPER VISOR II (CONTINUED)
CONTROL OR INDICATOR PURPOSE
AIR END DISCHARGE PRESSURE--P1 Shuts the compressor down when the compressor dis-
charge pressure exceeds P1 MAX. Continually monitors
the discharge pressure of the compressor unit. Indicates
pressure in compressor sump upon start--up to verify ro-
tor motor rotation.
PACKAGE OUTLET PRESSURE--P2 Continually monitors service line pressure. When line
(Service Line Pressure) pressure reaches the UNLOAD setting, the Supervisor
control signals the solenoid valve to unload the compres-
sor.
FLUID PRESSURE--P3 Continually monitors injection fluid pressure and shuts
down the compressor in the event of low fluid pressure.
FLUID FILTER DIFFERENTIAL SWITCH Continually monitors fluid filter differential and generates
an alarm when the fluid filter needs replacement.
INLET FILTER MAINTENANCE SWITCH Monitors condition of compressor inlet air filter and indi-
cates when replacement is required.
FLUID LEVEL SIGHT GLASS Indicates fluid level in the sump. Proper level is not to
fall below the center of the sight glass. Check level
when compressor is shut down.
DO NOT OVERFILL.
COOLER BYPASS VALVE Regulates flow of fluid to and around the cooler .
Designed to maintain a minimum operating
temperature of 185
_
F(85
_
C); used for fast
warm--up on start--up.
MINIMUM PRESSURE/CHECK VALVE Maintains minimum of 50 psig (3.4 bar) in the compres-
sor sump. Valve piston restricts receiver air discharge
from receiver/sump when pressure falls to 50 psig (3.4
bar). Also incorporated in this valve is a terminal check
valve which prevents line pressure backflow into the
sump during unload conditions and after shutdown.
PRESSURE RELIEF VALVE Protects compressor by venting compressed air in ex-
cess of 200 psig (13.8 bar) to atmosphere.
MODULATING INLET VALVE 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.
SOLENOID VALVE Bypasses the pressure regulator valve causing the in-
let valve to close when the compressor reaches maxi-
mum operating pressure. Also activates blowdown
valve.
W ATER REGULATING VALVE Regulates the amount of cooling water used in the
(water--cooled only) cooler to keep the the compressor running at a normal
operating temperature of 185
_
F(85
_
C).
BLOWDOWN VALVE Vents sump pressure to the compressor inlet during un-
load conditions and shutdown.
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