Section 5
OPERATION
22
5.2 PURPOSE OF CONTROLS
CONTROL OR INDICATOR
PURPOSE
HIGH PRESSURE SHUTDOWN SWITCH
An added protective device designed to shut 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 sump 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 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 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 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 switch in set cor-
rectly. If set correctly, the compressor will unload
at the desired unload pressure. If adjustments
are necessary, see Control System Adjustments
in the Maintenance Section of the manual.
7. Observe the operating temperature. 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.
Summary of Contents for 10B 25HP
Page 2: ...NOTE For Additional Information on 24KT Units See Inside Back Cover...
Page 4: ...NOTES...
Page 22: ...16 NOTES...
Page 24: ...Section 4 INSTALLATION 18 Figure 4 1 Piping and Instruments...
Page 26: ...20 NOTES...
Page 42: ...36 NOTES...
Page 44: ...NOTES...
Page 45: ......