Recommended Amperage Settings; Thermal Overload Protection; Maintenance & Servicing; General Maintenance - Forney 220 ST Manual De Instrucciones

Recommended Amperage Settings

SIZE OF WELDING ELECTRODE
1/16" – 16 Gauge
5/64" – 14 Gauge
3/32"
1/8"
5/32"
3/16"

Thermal Overload Protection

CAUTION
If the duty cycle of the welder is exceeded, a thermostat will automatically cut the power to
prevent the machine from overheating. If this should happen do not unplug the machine but let it
cool down. Then the thermostat will automatically reset itself and you can continue welding. The
thermostat is a protective safety device and no harm will normally be done to the welder unless
it is frequently over loaded, in which case damage will eventually result. For this model the
intervention of the thermostat is indicated by the lighting of the indicator fault light.
Maintenance & Servicing

General Maintenance

Your arc welder is simple and durable, requiring virtually no maintenance other than the guidelines shown
below:
• Keep the ventilation holes in welder clean to avoid the build-up of dirt inside the machine, this
can reduce machine output.
• Check all cables periodically; they must be in good condition and not cracked.
• Always try to avoid getting particles of metal inside the machine since they could cause
short circuits.
• Periodically clean the inside of the welder with compressed air.

Troubleshooting

This chart will assist you in resolving common problems you may encounter. These are not all the possible
solutions.
PROBLEM
Yellow Indicator is on
The adjustment knob on
the front panel didn't work
Cooling Fan not working
or turning very slowly
POSSIBLE CAUSE
Poor ventilation can cause over-
heating
Ambient temperature is too high
Using over the rated duty-cycle
Potentiometer broken (current
regulation)
Switch broken
Fan broken
Wire broken or falling off
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AMPERAGE SETTING
30-40
50-65
70-100
100-140
140-180
150-220
POSSIBLE SOLUTION
Improve the ventilation
It will automatically recover when
the temperature decreases
Replace the potentiometer.
Replace the switch
Replace or repair the fan
Check the connection
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