SECTION 2: DESCRIPTION
AIR N ARC
®
300 SERIES ALL-IN-ONE POWER SYSTEM
®
PAGE - 22
090010-OP_r0
and eliminates the need for a separate air reservoir.
Internal porting also lubricates the bearings and seals by
using pressure differentials.
The oil has three primary functions: coolant, sealant,
lubricant. The oil carries the heat associated with
compressing air to an air-to-oil heat exchanger. It also
seals the clearances between the rotors and the stator
housing, as well as between the rotors themselves.
Lastly, the oil lubricates the rotors and the bearings and
seal, allowing one rotor to drive the other, which is an
idler.
The rotors are mounted inside the main casting and
consist of a male and female rotor supported with low-
friction bearings sized for a long, useful life.
2.2.2 ELECTRONIC INLET VALVE
See
Figure 2-3
. The electronically-actuated inlet valve is
a piston-type valve located directly on top of the
compressor assembly, beneath the air inlet filter. On
initial start-up, the solenoid is energized and the inlet
valve opens due to pilot air being passed through the
solenoid actuated valve. When operating pressure is
reached, the pressure switch (
Figure 2-6
) de-activates
the solenoid and the inlet valve closes. At the same time,
the compressor pressure will unload to a lower pressure
(typically about 40 psig). Only the compressed air within
the compressor unit will reduce due to the operation of
the minimum pressure/check valve. This reduction in
internal air pressure reduces the power requirement
considerably during this unloaded state. The pressure
switch will re-activate the solenoid valve allowing the inlet
valve to open upon sensing an air demand (reduced
pressure). This will allow the compressor to start
producing air again.
2.2.3 AIR INLET FILTER
See
Figure 2-3
. The air inlet filter that is integrated into
the compressor assembly is a dry type replaceable
element that drops in directly on top of the inlet valve
assembly. It is accessible by removing the cover from the
top of the compressor assembly. For routine
maintenance of the air filter, consult
Sections 6.2
and
6.3
for maintenance schedules, and
Section 6.5.1
for
specific air filter maintenance procedures.
2.2.4 SECONDARY SPIN-ON AIR/OIL COALESCER
See
Figure 2-4
. The compressor assembly is fitted with a
secondary spin-on air/oil coalescer located on the top of
the filter support housing on the rear of the compressor
WARNING
Compressor oil can ignite if it comes in
contact with very hot surfaces, like a
muffler or exhaust manifold on the
engine.
NOTE
Refer to the Maintenance Section of this
manual for adjustment and replacement
procedures.
KEY
DESCRIPTION
A
AIR INLET FILTER
I
B
INLET CONTROL SOLENOID
VALVE
I
The air inlet valve is located internally
beneath the air filter.
Figure 2-3: Electronic Inlet Valve
A
B
