Section 5
COMPRESSOR OPERATION
23
5.1 INTRODUCTION
While Sullair has built into the LS--20S Series pack-
age a comprehensive array of controls and indica-
tors to assure its proper operation, the user should
recognize and interpret readings which call for ser-
vice or indicate the onset of a malfunction. Before
starting the unit, the user should become familiar
with the controls and indicators-their purpose, loca-
tion, and use.
5.2 PURPOSE OF CONTROLS
All Supervisor II Module (Supervisor) related func-
t ions and indic at or s ar e pr es ent ed in S ec t ion 6. 2, s o
please refer to that section for your information. Ad-
ditional indicators and functions included in the
package are as follows:
CONTROL OR INDICATOR PURPOSE
EMERGENCY STOP SWITCH Pushing in this switch, found adjacent to the Supervisor,
cuts all AC outputs from the latter and de--energizes the
starter. A fault message (E STOP) is displayed by the
Supervisor until the button is pulled out and the “
O
” pad
is depressed.
THERMAL O/L RESET Momentarily pushing this button, found on the starter’s
thermal overload element housing, re--closes the lat-
ter’s contacts after a current overload takes place.
Please be aware that the elements must be allowed to
cool sufficiently before resetting.
SULLICON ACTUATOR Actuates the inlet butterfly valve which throttles the air
flow to the compressor inlet, in order to match air sup-
ply to the demand.
SPIRAL VALVE (OPTIONAL) Internally bypasses and controls the air flow capacity
of the compressor, in order to match air supply to the
demand. This device is optional.
PRESSURE REGULATOR (SULLICON) Opens a pressure line between the sump and Sullicon
Control allowing the Sullicon Control to regulate air de-
livery according to the air demand.
PRESSURE REGULATOR (WITH OPTIONAL
SPIRAL VALVE) Opens a pressure line between the service line and
the spiral valve actuator allowing the spiral valve to
regulate air delivery according to air demand.
SOLENOID VALVE Electrically actuated, 3--way valve which controls the
flow of pneumatic logic signals. Used throughout pack-
age to:
S
Open the blowdown valve.
S
Load the Sullicon device/close the inlet butterfly
valve during shutdown operation.
S
Close the spiral valve.
DISCHARGE CHECK VALVE Blocks the reverse flow of air/fluid through the com-
pressor unit during shutdown.
MINIMUM PRESSURE VALVE Maintains 50 psig (3.5 bar) pressure in sump vessel.
When pressure falls below 40 psig (2.8 bar), it closes
and isolates the sump vessel from the air service line,
thus preventing compressed air backflow during un-
loading or shutdown.
PRESSURE RELIEF VALVE Vents the sump vessel to atmosphere if the com-
pressed air pressure exceeds 200 psig (13.8 bar). Its
operation indicates fault with the Supervisor operation
or its programming.
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