SECTION 2: DESCRIPTION
AIR N ARC
®
300 SERIES ALL-IN-ONE POWER SYSTEM
®
PAGE - 24
090012-OP_r0
approach 200 psig, it will crack open to slowly relieve
pressure. If pressure continues building through this
venting, it will be fully open at 200 psig. Both air and oil
will be expelled from this valve.
2.2.7 ADJUSTABLE PRESSURE SWITCH
See
Figure 2-6
.
The adjustable pressure switch is
mounted off of the generator support bracket, and is
plumbed into pressure on the upstream side of the
minimum pressure valve. The purpose of the switch is to
provide a control for the inlet valve control solenoid,
much like a pneumatic regulator valve. When the
pressure in the service line drops below the set limit, it
reactivates the inlet valve control solenoid, allowing the
inlet valve to suck in more air. The pressure switch has
both a high and low pressure setting.
Although the pressure cut-in and cut-out pressures are
pre-set at the factory, they may be manually adjusted.
For procedure on pressure control switch adjustment,
see
Section 6.6.14
.
2.2.8 OIL RESERVOIR AND PRIMARY AIR/OIL
SEPARATOR
The main casting of the compressor unit, which contains
the screw compressor, is also the oil reservoir and
primary oil separation unit. The initial (primary) oil
separation is caused by both changes in velocity and
direction. The main casting also contains the oil fill tube
and drain hose assembly. A separate oil reservoir is not
required.
2.3 OIL COOLING SYSTEM
See
Figure 2-7
. The machine package cooling system
consists of four (4) main heat exchange units identified in
Figure 2-7
, and the following explanation.
The compressor system lubricant is air-cooled via the
compressor-cooler portion [
E
] of the cooler assembly.
The assembly fan [
F
], which draws air through the cooler,
is driven by a hydraulic motor [
D
], whose fluid is cooled
by the fan motor’s cooler [
C
].
System Component or
Component Group
Manual
Section
Location
OIL COOLING SYSTEM
2.3
page 24
Compressor Temperature and
Pressure Switches
2.3.1
page 26
Compressor Spin-on Oil Filter
2.3.2
page 26
KEY
DESCRIPTION
A
AIR/OIL COALESCER
B
MINIMUM PRESSURE CHECK
VALVE
Figure 2-4: Spin-on Air/Oil Coalescer
& Minimum Pressure/Check Valve
A
B
Figure 2-5: Pressure Relief Valve
