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After this, take out the complete burner unit by moving it forward out of the boiler housing.
CAUTION
While removing the complete burner unplug both of the electrical and controlling cables of the fan. Next dismantle
the venturi on the suction side of the fan and check the blade wheel of the fan.
WARNING
Figure 18.2
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. Emery cloth, sandpaper
or any other abrasive material must NEVER be used to clean the electrode.
•
Gasket
If any part of a gasket has a discolored, changed texture, has been hardened, the rubber has cured and/or has
damages, these gaskets must be replaced. Note: only use gaskets that are supplied by the boiler manufacturer.
•
Insulation
If the insulation is damaged or has been wet, it must be replaced.
•
Heat exchanger and boiler combustion chamber
After the removal of the complete burner unit check if there is any debris and dirt in the heat exchanger. The coils
of the heat exchanger can be cleaned by using a non-metallic brush. After this the dirt and dust can be removed
with a vacuum cleaner and by flushing the boiler combustion chamber with water. Never expose the refractory
insulation in the back of the combustion chamber to water or let it get wet. Do not forget to clean the condensate
trap once again afterwards. Do not use acid or alkali products for cleaning, with the exception of white vinegar with
max. 7% acetic acid. Afterwards always rinse with fresh water. Ensure that the insulation remains dry.
A plastic card can be used to clean in between the coils.
Watch out not to damage the burner plate insulation during this operation.
Crystalline Silica – Read instructions of § 18.2 carefully
• Burner
Gasket
Check the burner surface to see if it has damages, signs of rust
Insulation
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
Burner
cleaner or pressurized air.
• Ignition electrode
Electrode
Check if the distances between the electrodes and between the
electrode and the burner are according to figure 18.19. 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.
Before trying to bend an electrode that has already been used
ensure a replacement electrode is available on hand.
E93.1901EN032 Installation and Service Manual SlantFin VGH-CH / CO
Warning
139
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