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sectioN 4
4.1 operaTIon
elecTrIc sHocK can kill.
• Do noT operate the unit with the cover removed.
• Do noT apply power to the unit while holding or
carrying the unit.
• Do noT touch any torch parts forward of the
torch handle (nozzle, heat shield, electrode, etc.)
with power switch on.
arc rays can burn eyes and skin;
noIse can damage hearing.
• Wear welding helmet with no. 6 or 7 lens shade.
• Wear eye, ear, and body protection.
position the prest-o-lite
ters) from the cutting area. sparks and hot slag from
the cutting operation can damage the unit.
FAULT LIGHT
AMBER
POWER ON-OFF
(I-O) SWITCH &
CIRCUIT BREAKER
AIR LIGHT
GREEN
AIR CHECK
BUTTON
AIR PRESSURE
GAUGE
550 at least 10 feet (3 me-
®
figure 4-1. prest-o-lite
4.2 presT-o-lITe
(fIGure 4-1)
a.
power switch (located on front panel). When
placed in ON position, the white pilot light will glow
indicating control circuit is energized and the cooling
fan will run.
B.
output current control. Adjustable from 15 to 35
amperes to suit cutting conditions.
c.
air check push Button switch. When energized,
air filter-regulator can be adjusted to desired pres-
sure (55-65 psig) before cutting operations. Allow
air to flow for a few minutes. This should remove any
condensation that may have accumulated during
shutdown period. After setting the pressure, release
the button to its normal position.
D.
"over Temperature" leD yellow light - will turn
on if the machine becomes overheated. Will turn off
automatically after the machine cools down if the
on/off switch is still on.
AIR REGULATOR
CONTROL KNOB
CURRENT
CONTROL
KNOB
550 controls
®
25
operatioN
550 conTrols
®
REAR VIEW
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