Miller Electric HF-251D-1, HF-251-2 manual Adjusting Spark Gaps

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5-2. Adjusting Spark Gaps
			Turn Off unit and welding power
			source and disconnect input power.
		Rear Of Unit	Loosen screw on spark gap access
			Loosen screw on spark gap access
			door and open.
			1 Tungsten End Of Point
			Do not clean or dress tungsten.
			Replace point if tungsten end
			disappears.
			2	Spark Gap
			Normal spark gap is 0.008 in (0.203
			mm).
			If spark gaps are okay, reinstall
			door. If adjustment is needed, con-
			tinue as follows:
			3	Adjustment Screws
			Loosen screws. Place gauge of
			proper thickness in spark gap.
			4	Pressure Point
			Apply slight pressure at point until
			gauge is held firmly in gap. Tighten
			adjustment screws to 12 in/lbs
			torque (overtightening will deform
			plastic base). Repeat gauge adjust-
			ment with other gap.
1	2		Close access door.
	2

3	4
Tools Needed:
5/32 in	0.008 in
5/32 in	(0.203 mm)
				Ref. 098 956-G

OM-611 Page 18

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Contents Processes OM-611Description From Miller to You Table of Contents Page Arc Welding Hazards Symbol UsageMarks a special safety message Electric Shock can killFlying Metal can injure eyes ARC Rays can burn eyes and skinWelding can cause fire or explosion Buildup of GAS can injure or killCalifornia Proposition 65 Warnings EMF Information Principal Safety StandardsAbout Pacemakers Identifie un message de sécurité particulier − Consignes DE Sécurité − À Lire Avant UtilisationLES Pièces Chaudes peuvent cau- ser des brûlures graves LE Soudage peut causer un incen- die ou une explosionLES Particules Projetées peu- vent blesser les yeux LE Bruit peut affecter l’ouïe’EMPLOI Excessif peut Faire Risque D’INCENDIE OU D’EXPLOLA Chute DE L’APPAREIL peut blesser LES Pièces Mobiles peuvent cau- ser des blessuresInformation sur les champs électromagnétiques Principales normes de sécuritéConsignes relatives aux stimulateurs cardiaques Specifications − InstallationTypical Process Connections Installing Gas Supply IN-GAS-OUTPower Source Plug Information And Connections Amperage ControlOperator Control Receptacle Socket Information Operator Control Receptacle Information And ConnectionsSocket Connecting To Weld Output Terminals Electrode Electrode OUT Work INPUT/OUTPUTConnecting Input Power − Operation High Frequency SwitchHigh Frequency Selector Switch ControlsHigh Frequency Intensity Control Power Switch And Pilot LightPostflow Timer Shielding Gas− Maintenance & Troubleshooting Routine Maintenance MonthsAdjusting Spark Gaps Troubleshooting Trouble Remedy− Electrical Diagrams Circuit Diagram For 115 Volts ModelCircuit Diagram For 230 Volts Model Welding Processes Requiring High Frequency Incorrect Installation− High Frequency Weld ZoneMetal Building Correct InstallationMetal Building Requirements Amperage Range Gas Type Polarity AC − Argon AC − Argon −Positioning The Torch − Guidelines for TIG Welding GtawPreparing Tungsten Electrode For Welding Preparing Tungsten For Conventional AC WeldingTungsten Without Filler Rod Torch Movement During WeldingPositioning Torch Tungsten For Various Weld Joints Tungsten With Filler RodReturn To Table Of Contents − Parts List Complete Assembly Part 1 of 2 115V ModelComplete Assembly Part 1 Complete Assembly Part 2 of 2 115V Model Complete Assembly Part 2 Page Page Page Service SupportOwner’s Record Miller Electric Mfg. Co