SECTION 2 1800-3000 USER MANUAL
19
2.7 AIR INLET SYSTEM,
FUNCTIONAL DESCRIPTION
Refer to Figure 2-5. The compressor air inlet system
consists of a dry-type air filter, a restriction gauge
and an air inlet valve.
The restriction gauge (located on the air filter)
indicates the condition of the air filter by showing red
when filter maintenance is required.
The poppet-type modulating air inlet valve directly
controls the amount of air intake to the compressor in
response to the operation of the pressure regulator.
Refer to Modulating Mode —100 to 110 PSIG (6.9 to
7.6 BAR) on page 18. The inlet valve also acts as a
check valve, thus preventing reverse rotation when
the compressor is shut down.
2.8 INTEGRAL DRYER OPTION
An integral refrigerated dryer option is available. The
integral dryer is designed to work with the
compressor WS controller which controls dryer
starting and stopping, condensate drain valve
function and monitors dewpoint temperature and
dryer warnings and faults. The dryer is fully
connected from the factory and is ready to run when
the compressor is installed.
Detail of dryer operation and spare parts can be
found in a supplement Manual 02250174-308 which
is provided with your machine.
Per the controller default settings, on initial start-up
the compressor will run unloaded for 5 minutes,
allowing the dryer to run and cool down. This
prevents condensate from initially being allowed into
the compressed air stream. It also delays the supply
of compressed air from the compressor until the 5
minute cool-down period is completed. When the
automatic control mode is selected, the compressor
will stop after running unloaded for a prescribed time,
but the dryer will continue to run to ensure there will
not be a surge of condensate when the compressor
re-starts. For other settings and control options, refer
to the WS controller manual 02250165-411, or to
your authorized Sullair servicing distributor.
In case the compressor needs to operate while the
dryer is being serviced, the dryer can be bypassed,
and removed if necessary for service. To bypass the
dryer, disconnect the inlet hose to the dryer,
disconnect the outlet hose at the main service
connection, and re-connect the dryer inlet hose to the
main service connection. Remove the fuses
powering the dryer and control wiring located in the
compressor electrical box. The WS controller must
be set-up for the compressor to run on dryer fault. If
necessary, this can be reset by your authorized
Sullair servicing distributor.
2.9 VARIABLE SPEED DRIVE
(VSD) COMPONENTS
The VSD, located in the machine’s electrical
enclosure, works in concert with the WS Controller to
allow the compressor to match its output to the
current demand on the system. The drive’s heat sink
extends through the back of the enclosure, and is
cooled by air flowing through the compressor
enclosure.
WARNING
“The Plastic Pipe Institute recommends
against the use of thermoplastic pipe to
transport compressed air or other com-
pressed gases in exposed above ground
locations, e.g. in exposed plant piping.” (I)
Sullube should not be used with PVC piping
systems. It may affect the bond at cemented
joints. Certain other plastic materials may
also be affected.
(I) Plastic Pipe Institute, Recommendation
B, Adopted January 19, 1972.
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