OM-626 Page 12
4-3. Coolant Guidelines
WARNING
ELECTRIC SHOCK can kill; MOVING
PARTS can cause serious injury.
• Do not touch live electrical parts.
• Keep away from moving parts.
• Disconnect input power plug from receptacle before
cleaning system components.
FAILURE TO PROPERLY MAINTAIN
COOLANT SYSTEM can cause damage
to the coolant system and torch/gun.
• Circulate and flush clear water through entire
system, and replace coolant every six months.
INCORRECT COOLANT will damage
unit.
• Use plain distilled or deionized water, or use high
quality tap water.
• In freezing temperatures use only a mix of pure
ethylene glycol and distilled or deionized water such
as MILLER coolant Part No. 128 705 or equivalent.
DO NOT USE AUTOMOTIVE ANTIFREEZE.
Ref. ST-137 225-D / S-0760
Follow these guidelines to de-
crease corrosion in unit.
Material in contact with coolant can
only be brass, copper, silver solder,
300 Series stainless steel, or plas-
tic.
1 Coolant
See table for coolant mixture need-
ed for operating temperature.
2 Filler Cover
Keep coolant level full. Length of
coolant hoses affects amount of
coolant needed in unit.
Change coolant when dirty or every
6 months.
3 Connections
Keep connections tight. Make elec-
trical connections with connectors
of the same metal.
1
Coolant
Tighten Connections
3
TEMP.
Above 32° F
(0° C)
0° F (–18° C)
to 32° F (0°C)
Below 0° F
(–18° C)
Distilled,
Deionized,
Or High
Quality Tap
Water
35% Ethylene
Glycol And
65% Water
See Ethylene
Glycol
Manufacturer’s
Suggestion
2
Figure 4-4. Coolant Guidelines
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