SECTION 2: DESCRIPTION
AIR N ARC
®
300 SERIES ALL-IN-ONE POWER SYSTEM
®
PAGE - 24
090034-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 near
the lift bale 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 two (2) main heat exchange units identified in
Figure 2-7
, and the following explanation.
The hydraulic system lubricant is air-cooled via the
hydraulic cooler [
A
]. The compressor system lubricant is
air-cooled via the compressor-cooler portion [
B
].
Both fans draw air through the machine, past the cooler,
and out of the package. The hydraulic fan is turned on by
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
