Miller Electric 255 warranty Table of Contents

WARNING

This product, when used for welding or cutting, produces fumes or gases which contain chemicals known to the State of California to cause birth defects and, in some cases, cancer. (California Health & Safety Code Section 25249.5 et seq.)

The following terms are used interchangeably throughout this manual:

MIG = GMAW

OM-154 501V

TABLE OF CONTENTS

SECTION 1 – SAFETY PRECAUTIONS - READ BEFORE USING		1
1-1.	Symbol Usage	1
1-2.	Arc Welding Hazards	1
1-3. Additional Symbols For Installation, Operation, And Maintenance		3
1-4.	Principal Safety Standards	3
1-5.	EMF Information	4

SECTION 2 – INSTALLATION			5
2-1.		Specifications	5
2-2.		Volt-Ampere Curve	5
2-3. Welding Power Source Duty Cycle And Overheating			6
2-4.	Welding Gun Duty Cycle And Overheating		6
2-5.		Installing Work Clamp	7
2-6.		Installing Gas Supply	7
2-7.		Installing Welding Gun	8
2-8.		Installing Wire Spool And Adjusting Hub Tension	8
2-9.		Setting Gun Polarity	9
2-10. Positioning Jumper Links			9
2-11.		Electrical Service Guide	10
2-12.		Selecting A Location And Connecting Input Power	10
2-13.		Threading Welding Wire	11

SECTION 3 – OPERATION		12
3-1.	Front Panel Controls	12
3-2.	Center Baffle Controls	13
3-3.	Weld Parameter Chart	14

SECTION 4 – MAINTENANCE & TROUBLESHOOTING		16
4-1.	Routine Maintenance	16
4-2.	Circuit Breaker CB1	16
4-3. Fuses F1 And F2		17
4-4. Changing Drive Roll And Wire Inlet Guide		17
4-5. Replacing Gun Contact Tip		17
4-6. Cleaning Or Replacing Gun Liner		18
4-7.	Replacing Switch And/Or Head Tube	19
4-8.	Troubleshooting	20
SECTION 5 – ELECTRICAL DIAGRAM		21
SECTION 6 – PARTS LIST		23
OPTIONS AND ACCESSORIES
WARRANTY