Slant/Fin VGH-299-CH Installation And Service Manual page 111

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4
Burner
Check the burner surface to see if it has damages, signs of rust and/or cracks. When the burner surface is
damaged the burner must be replaced. The burner can be cleaned by using a soft (non-metallic) brush. The dust
can be removed with a vacuum cleaner or pressurized air.
Ignition / ionization electrode
When the complete burner is removed, it is very easy to check the ignition electrode. First check if the distances
between the electrodes and between the electrode and the burner are according to the figure below. When these
are not correct, try to bend the electrodes into the right position. Notice: the electrodes undergo high temperatures,
therefore the electrodes become hard and are difficult to bend. While bending used electrodes they might break
or burst. Check the electrode, after bending, for any tear/crack and signs of rust. When they are damaged in any
manner or rusty, replace the electrode. Also replace the electrode when there is a crack in the ceramic insulation
of the electrode. When the electrode is replaced, also the gasket must be replaced. The electrode must be cleaned
annually by lightly rubbing its surface with a dollar bill. Emory cloth, sandpaper, and any other abrasive material
may never be used to clean the electrode.
Needed tools: Phillips #2 screwdriver.
Point of view in next picture 
Picture 19.3
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3
Always check gaskets on non-return valve for air/gas leakage!!
E93.1601EN032.C VGH installation manual
1 = Seat check valve small
2 = Lock nut M5 DIN985
3 = Gasket gas air mixing
4 = check valve small
Picture 19.2
D = 8 - 10 mm
D
D = 0.315 - 0.393 inch
3.5 mm / 0.14 inch
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