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Instruction Manual
Multi 250 - 400K - 500F - 500K - 500 MAR e Accessories
8.6 Cooling unit Alarm
When the generator is equipped with the cooling unit, the correct cooling liquid cir-
culation is constantly controlled. The cooling unit works only when Mig, Pulsed Mig
or Tig processes are activated.
The cooling unit pump is activated switching the torch trigger and turns o 4 minutes
after the welding job end.
In case of liquid circulation failures, output is disabled and display will show:
ALL h2o
Reset the machine switching the main knob ON/OFF.
Long unactivity periods may damage the cooling unit pump or generate momentary
re-start problems. First ensure the presence of liquid inside the tank and control the
right positioning of the in/out hoses – following instructions may help:
• unplug the water-out blu hose from the machine rear panel and plug a temporary
hose
• push & release the torch trigger once: cooling unit pump test should be activated
for 15 seconds
• cooling liquid should ow from the temporary hose: if not, repeat the pump test as
above
• once ensured the correct liquid owing, restore the original hose
• if necessary, control the correct liquid owing at the intermediary levels, i.e wire
feeder unit rear and front
6
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