Section 6
COMPRESSOR OPERATION
33
6.2 PURPOSE OF CONTROLS
CONTROL OR INDICATOR PURPOSE
PRESSURE RELIEF VALVE Opens sump pressure to the atmosphere should
pressure inside the sump become too high (150 PSIG
[10.3 bar]). Operation of this valve indicates that the
high pressure switch is either faulty or out of adjust-
ment.
SULLICON CONTROL Regulates the amount of air allowed to enter the air in-
let valve. This regulation is determined by the amount
of air being used at the service line.
PRESSURE REGULATOR --- SULLICON Opens a pressure line between the sump and Sul-
licon Control allowing the Sullicon Contr ol to regulate
air delivery according to the air demand.
PRESSURE REGULATOR--- SPIRAL VALVE Opens a pressure li ne between the service line and
the spiral valve actuator allowing the spiral valve to
regulate air delivery according to air demand.
SOLENOID VALVE #1 Bypasses the pressure regulator valve causing the
Sullicon Control to close the inlet valve when the
compressor reaches maximum operating pressure.
SOLENOID VALVE #2 (spiral valve control) Opens when the compressor starts; closes when the
compressor is shut off. This prevents any air system
loss when the compressor is shut off.
LINE PRESSURE TRANSDUCER (P2) Senses service line pressure. When line pressure
reaches maximum setting, the Supervisor signals the
solenoid valve to OFF LOAD the compressor. The
message “ON LOAD” or “OFF LOAD” will be dis-
played to indicate the status of the control. P2 is also
used to calculate separator differential pressure ∆P1.
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.
6.3 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.
WA R N I N G
!
Be sure that the depressurization line between
the sump and the air---cooled cooler package is
co nnected a s ex pla ined in S ectio n 4 ( P a r 4 .6) .
4. Set the compressor in MANUAL mode and start
the compressor by pressing the ON/OFF pad.
5. Check for possible leaks in piping.
6. Slowly close the shut---off valve and check that
the maximum pressure (P2) and pressure differ-
ential (P2) are correctly programmed.
7. Observe the operating temperature. If the oper-
ating temperature exceeds 205_F(96_C), the
cooling system or installation environment
should be checked.
8. Observe return line sight glasses and mainte-
nance indicators.
9. Open shut---off valve to service line.
10. Reinspect the compressor for temperature and
leaks the following day.
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