SECTION 2: DESCRIPTION
AIR N ARC
®
200 SERIES ALL-IN-ONE POWER SYSTEM
®
page - 24
090019-OP_r0
for maintenance schedules, and
Section 6.5.1
for
specific air filter maintenance procedures.
2.2.3 PRESSURE RELIEF VALVE
See
Figure 2-4
.
The pressure relief valve is the last
safety device that will be activated. It is a spring-backed
normally closed valve that will vent excess pressures to
the atmosphere when excessive pressures are reached.
The Air N Arc 200 Series Power System is equipped with
a 200 psig relief valve. As the pressure begins to
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.
2.2.4 PILOT VALVE
See
Figure 2-5
. The pilot valve senses the air pressure
in the air tank receptacle. When the tank’s pressure rises
to the preset “unload” valve setting, the valve’s ball
opens, passing high pressure air to the compressor
unloading device. When the tank pressure drops to the
preset “load” valve setting, the ball closes, venting the
compressor-unloading device to atmosphere.
Since the compressor operation is constant when
the machine is on, the system is always building a
supply of high pressure air. Whenever the pressure
in the air tank drops below 150 psi, the engine will
run at full throttle until the pressure in the tank
reaches 175 psi, which will be indicated on the
pressure gauge of the instrument panel.
If the compressor is not needed due to:
•
The operator wants the engine to start at idle
speed when the system air pressure is
below 150 psi.
•
The engine needs to be freed up to accom-
modate for demand elsewhere.
The pilot valve allows the operator to manually bypass
the compressor startup or turn off the compressor during
operation, which in turn cancels its draw on the engine.
NOTE
There must be a minimum of 10 psi in the
air tank to allow for an idle start.
Otherwise the regulator valve will bypass
the manual switch until the tank reaches
this minimum (10 psi) pressure.
KEY
DESCRIPTION
A
AIR INLET FILTER
B
INLET FLOW CUTAWAY VIEW
C
AIR INTAKE VENTS
D
AIR FILTER ELEMENT
Figure 2-3: Compressor Air Intake
C
C
D
A
B
Figure 2-4: Pressure Relief Valve
