Air Compressor Gauge And Regulator; Air Compressor Overload Protection - Miller TRAILBLAZER 302 AIR PAK Owner's Manual

7-2. Air Compressor Gauge And Regulator

1
!
The air pressure gauge reads the air
compressor line pressure. Air pres-
sure in the compressor case may be
high even when the gauge reads
zero. Wait 10 minutes for compres-
sor blow down cycle to complete be-
fore checking/adding oil or perform-
ing maintenance.
.
Weld output and generator power are
reduced when the air compressor is
on.
With the compressor on, weld or gen-
erator loads will cause the engine to
run at 3600 RPM.

7-3. Air Compressor Overload Protection

2
1 Air Compressor Gauge
2 Air Pressure Regulator
Adjust system pressure with the regulator.
Set pressure in the no-flow condition only.
To reduce engine load and allow higher
weld and generator output, set at lowest
possible pressure for the job.
.
Set pressure in the 80 − 100 psi (552 −
689 kPa) range to operate plasma cut-
ting equipment or to gouge (CAC-A).
Set pressure in the 100 − 125 psi (689
− 862 kPa) range to operate pneumatic
tools.
OVER PRES
COMP TEMP
Ref. 804 857-A / Ref. 229 219-A / 229 807-B
.
Do not set pressure above 150 psi
(1034 kPa). If air pressure exceeds
150 psi the compressor clutch will dis-
engage and shut down the compres-
sor.
Do not set pressure below 80 psi (552
kPa). Compressor will supply 80 psi re-
gardless of setting below 80 psi.
See Section 7-3 for air compressor over-
load information.
.
See Section 9-5 for engine/generator
overload protection.
Over Pressure Protection
.
Do not set air pressure above 150 psi
(1034 kPa). If air pressure exceeds
150 psi the compressor clutch will
disengage and shut down the com-
pressor.
If the compressor shuts down due to high
pressure, use the Air Pressure regulator
to reduce the system pressure. See Sec-
tion 7-2.
The compressor is equipped with an
emergency relief valve that will open if
pressure approaches 200 psi (1379
kPa).
Over Temperature Protection
.
The compressor is equipped with
high oil temperature shutdown. High
oil temperature can be caused by low
oil, hot air recirculation, blocked or
clogged cooler, or fan failure.
.
When the temperature inside the unit
drops below 455 (75 C), internal
heaters activate to prevent air sys-
tem freeze-up. Ice in air system com-
ponents may cause an Over Pres-
sure condition.
Ref. 804 857-A / Ref. 229 219-A
OM-229 930 Page 37