Lincoln Electric IM10015 TOMAHAWK 375 AIR - Manual (Page 15)

B-5 OPERATION B-5
5. Internal / External Air selection: This switch
selects the air supply. With the Internal Compressor
position selected, the machine operates through the
built-in compressor. With the External Air position
selected, the internal compressor is completely dis-
abled and the machine operates through an exter-
nal air supply hose connected to the proper air inlet
connection located on the back of the machine.
If operating with External Air, be sure to select the
External Air switch position in order to completely
disable the built-in compressor. Otherwise the
compressor may be damaged by the possibility of
greater external air pressure.
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6. Air Pressure Gauge and Regulator Knob: The
Air Pressure Gauge indicator is provided with two
arrows: one white and one blue:
• Internal Air mode (internal compressor): the white
arrow indicates the normal pressure that the inter-
nal compressor can reach. This pressure set point
is fixed and cannot be adjusted.
• External Air mode (air supplied from an external
compressor): use the blue arrow to set the correct
air pressure (to set the correct pressure, turn the
output knob into the blue Purge zone).
Items 7 thru 10 on the back of the TOMAHAWK™
375 AIR (See Figure B.3)
7. Fan: Provides machine cooling. When the machine
is switched ON, the fan runs continuously.
8. Power Switch: Turns ON / OFF the input power to
the machine.
9. Input cable: Connects unit to the input power.
10. Air Inlet: External Air operating mode only.
Compressed Air Connection.
Clean, dry air must be supplied to the machine. A
pressure setting above 110 PSI (7.5 bar) could
damage the torch. Failure to observe these pre-
cautions could result in excessive operating tem-
peratures or damage to the torch.
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CUTTING PROCESS
When preparing to cut, position the machine as close
to the work as possible. Make sure to have all materi-
als needed to complete the job and have taken all
safety precautions. It is important to follow these oper-
ating steps each time the machine is used.
Turn the machine's ON/OFF POWER SWITCH to the
OFF position.
• Select the air supply using AIR select switch.
• Connect the air supply to the machine, if using
external air supply mode.
• Turn the main power on and the machine power
switch to the ON position.
- The fan will start.
- The pre-charge circuit will operate for 3 seconds,
then the green "Power" LED will illuminate.
TOMAHAWK™ 375 AIR
WARNING
WARNING
10 9 8 7
FIGURE B.3