Installing Welding Gun; Setting Gun Polarity For Wire Type; Installing Gas Supply - Miller BOC Migmatic 250 Owner's Manual

2-5. Installing Welding Gun

2-6. Setting Gun Polarity For Wire Type

.
Always read and follow wire manufacturer's recommended polarity, and see label inside unit by wire drive assembly.
Tools Needed:

2-7. Installing Gas Supply

4
6
1
3/4 in
Argon Gas
OR
7
5
Tools Needed:
2
4
3
1
2
3
8 9
CO Gas
2
1-1/8, 5/8 in
1 Drive Assembly
2 Gun Securing Knob
3 Gun End
Loosen securing knob. Insert gun
end through opening until it bottoms
against drive assembly. Tighten
knob.
4 Gun Trigger Plug
Insert plug into receptacle, and
tighten threaded collar.
Close door.
Ref. ST-150 256-D
Obtain gas cylinder and chain to
running gear, wall, or other station-
ary support so cylinder cannot fall
and break off valve.
1 Cap
2 Cylinder Valve
Remove cap, stand to side of
valve, and open valve slightly. Gas
flow blows dust and dirt from valve.
Close valve.
3 Cylinder
4 Regulator/Flowmeter
Install so face is vertical.
5 Regulator/Flowmeter Gas
Hose Connection
6 Welding Power Source Gas
1
Hose Connection
Connect customer supplied gas
hose between regulator/flowmeter
gas hose connection, and fitting on
2
rear of welding power source.
7 Flow Adjust
Typical flow rate is 20 cfh (cubic
feet per hour). Check wire man-
3
ufacturer's recommended flow
rate.
8 CO Adapter (Customer Sup-
2
plied)
9 O-Ring (Customer Supplied)
Install adapter with O-ring between
regulator/flowmeter and
cylinder.
Ref. ST-148 265-B / ST-802 028
OM-1308 Page 7
CO
2