Section 5
OPERATION
22
5.2 PURPOSE OF CONTROLS
CONTROL OR INDICATOR PURPOSE
HIGH PRESSURE SHUTDOWN SWITCH An added protective device designed to s hut down
the compressor when the pressure inside the sump
becomes too high (135 PSIG [931kPa]). Operation of
this valve indicates that the high pressure protection
switch is either faulty or out of adjustment.
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.
PRESSURE REGULATOR Opens a pressure line between the s ump and air inlet
valve allowing the inlet valve to regulate air delivery
according to demand.
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.
PRESSURE SWITCH Senses service line pressure. When line pressure
reaches maximum setting the pressure switch sig-
nals the solenoid valve to unload t he compressor.
BLOWDOWN VALVE Vents sump pressure to the atmosphere during un-
load conditions and shutdown.
WATER REGULATING VALVE Regulates t he amount of cooling water used in the
(water---cooled only) cooler to keep the compressor running at a normal
operating temperature of 170_F(77_C).
5.3 INITIAL START -- UP PROCEDURE
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.
2. Be sure that all preparations and check s de-
scribed in the Installation section have been
made.
3. Crack open t he 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 switch in set cor -
rectly. If set correctly, the compressor willunload
at the desired unload pressure. If adjustments
are necessary, see Control System Adjustments
in the Maintenance Section of the manual.
7. Observe the operating t emperature. If the oper-
ating temperature exceeds 200_F(93_C), the
cooling system or installation environment
should be checked.
8. Observe return line sight glass and maintenance
indicators.
9. Open shut--- off valve to service line.
10. Re---inspect the compressor for temperature
and leaks the following day.
5.4 SUBSEQUENT START-- UP PROCEDURE
On subsequent start---ups, check that the proper
level is visible in the fluid sight glass and simply
press the START button. When the compressor is
running, observe the instrument panel and mainte -
nance indicators.
5.5 SHUTDOWN PROCEDURE
To shut the compressor down, simply press the
STOP button.
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