Sullair LS-25 Operator's Manual And Parts List page 27

ing blowdown results in low unload power con-
sumption. While the compressor is running un-
loaded, the inlet butterfly valve and spiral valve re-
main in the unloaded position.
When the line pressure drops back to 100 psig (6.9
bar) due to an increase in the air demand, the air
pressure switch or Supervisor "load" contacts close.
The pilot is then energized allowing the air pressure
behind the Sullicon Control to be vented through
the pilot valve exhaust port. The blowdown valve
closes, and the inlet butterfly valve opens, and the
spiral valve shifts to full load.
For a compressor with varied periods of time when
there are not air requirements, an AUTO feature is
provided. This feature allows you to set the com-
pressor in an automatic position whereby the com-
pressor will shut down (time delayed) when no
compressed air requirement is present and restart
as compressed air is needed.
2.7 AIR INLET SYSTEM, FUNCTIONAL DESCRIP-
TION
Refer to Figure 2-7. The compressor inlet system
consists of a dry-type air filter, a maintenance
gauge, or Supervisor display and an air inlet
valve.
The maintenance gauge, located on the compres-
sor instrument panel, indicates the condition on the
air filter for the electro-mechanical models. When
the pointer reaches the red zone, maintenance is
required.
On compressors utilizing the Supervisor controller,
maintenance need is indicated when the LED light,
located at the filter icon on the display panel, starts
to flash.
The butterfly-type air inlet valve, directly controls
the amount of air intake to the compressor in re-
sponse to the operation of the Sullicon Control
(Section 2.6).
2.8 INSTRUMENT PANEL GROUP, FUNCTIONAL
DESCRIPTION- STANDARD
CHANICAL CONTROLLER
The electro-mechanical controller responds to sig-
nals from traditional pressure switch sensors and
provides stop/start, automatic control, common
fault indication, sensor bypass timing, wye-delta
transition timing, and facilitates selectable automat-
ic restart after power failure.
Stop/Start input is provided.
Refer to Figures 2-8
parts described.
ELECTRO-ME-
Two-wire remote
and 2-9 for specific location of
The sump pressure gauge continually monitors
the sump pressure at the various load and/or un-
load conditions.
The discharge temperature gauge monitors the
temperature of the air leaving the compressor unit.
For both air-cooled and water-cooled compressors
the normal reading is approximately 180°F to 205°F
(82°C to 96°C).
The separator maintenance gauge monitors con-
dition of the separator element and shows in the red
zone when the element restriction is excessive.
The fluid filter maintenance gauge monitors the
condition of the bearing lube filter element and
shows in the red zone when the element should be
changed.
The START (I) pad turns the compressor on.
The STOP (O) pad turns the compressor off.
The hourmeter records cumulative hours of opera-
tion for the compressor and is useful for planning
and logging service operations. The hour meter
should be active any time K1 is energized. Meter
rolls over to zero at 100,000 hours.
The POWER ON (
panel indicates when power to the compressor is
supplied.
The ON LED indicates when the compressor is run-
ning.
The AUTO ( ) pad is used to enable automatic
control.
The RUN Status LED indicates that control is in a
standby mode and may start at any moment without
any user intervention when this light is blinking. A
solid light indicates that the machine is running.
2.9 ADDITIONAL FEATURES
Refer to Figure 2-8 for specific location of parts de-
scribed.
A separate input is provided for the Remote
Stop/Start feature. A maintained, voltage-free con-
tact is required for Remote Stop/Start.
•The Wye-Delta Transition Timer- K4 closed as
soon as K1 closes and remains closed until timer
setting is reached and then opens and stays open
until machine is stopped (Output 8 goes high on
start and drops at timeout).
•Timer Adjustment- Timer adjustment becomes
effective the next time that function is required.
Section 2
DESCRIPTION
) LED on the instrument
21