Slant/Fin VHG-100-CH Installation And Service Manual page 141

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Fan
When the fan blades are polluted and dirty, carefully clean the blades with a soft brush. Notice: do not use too
much force on the blades or else the fan might be out of balance and run irregularly, causing noise and fan failures.
Also check the fan for any water damage. In doubt always replace the fan of the boiler.
•
Condensate trap
Disassemble the condensate trap and clean every part of it. Check the condensate trap connection of the heat
exchanger for any blockage or pollution and clean it (if necessary). Check the functioning of the condensate trap
by pouring clean tap water in the boiler combustion chamber (when burner door is removed). This water will exit
the heat exchanger by the condensate trap. Notice: do not wet the rear wall insulation.
When mounting the bottom part of the condensate trap, before commissioning the boiler
and/or after maintenance, the condensate trap must ALWAYS be completely filled with water.
This is a safety measure: the water in the condensate trap keeps the flue gases from
WARNING
leaking out of the heat exchanger via the condensate drain.
Figure 18.5
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Gas/air ratio
With every service check and/or maintenance of the boiler always check the gas/air ratio by measuring the CO
percentage (flue gas) at the maximum and minimum load of the boiler. If necessary, adjust these values. For more
information see chapter 17.
•
Circulator (internal)
Check the electrical parts and the motor of the circulator for a correct functioning. The circulator must generate a
sufficient water flow over the (heat exchanger of) the boiler. When the circulator produces noise, has been
operational for more than ten years or shows signs of water leakage it is recommended to replace the circulator
as a precaution.
• When faults and abnormalities are discovered by the service technician during service or
• During service and maintenance, the gas, supply air, flue gas and condensate
WARNING
• Cleaning the combustion chamber and heat exchanger with acid or alkali products is
The condensate trap must always be
filled to the edge with water, before
connecting it to the appliance.
maintenance and these prove not to be repairable, this must be reported to the
owner/end-user of the installation. The owner/end-user must also be advised how to fix
these faults. Finally, these faults must be reported in the service report / log file of the
boiler.
connections are disconnected, checked and replaced. Make sure that all these
components are mounted correctly before commissioning the boiler again.
prohibited, with the exception of white vinegar with max. 7% acetic acid.
E93.1901EN032 Installation and Service Manual SlantFin VGH-CH / CO
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