Potterton Suprima 100, Installation & Service Instructions Manual

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4. To Service the Boiler & Component Replacement - Page 22
To ensure continued efficient operation of the appliance, it is recommended that it is
checked and cleaned as necessary at regular intervals.
The frequency of servicing will depend upon the particular installation conditions and usage
but in general once per year should be adequate.
It is the law that any service work must be carried out by a competent person who is C.O.R.G.I. Registered.
Before servicing, fire the appliance and check that the flames are blue.
Yellow flame and excessive lifting indicate poor combustion.
WARNING
Before commencing work turn the temperature control knob to 'O' Off
and allow the appliance to cool, isolate the electricity supply.
If the gas valve is to be removed turn off the gas supply at the appliance service cock.
IMPORTANT
Always test for gas soundness after completing any servicing of gas carrying
components and carry out functional checks of controls.
IMPORTANT
Ensure that the outer white case is correctly fitted and that the
sealing strip fitted to the door is forming a tight seal with the boiler casing.
Notes on Cleaning Boiler Components
Heat Exchanger
Place a sheet of paper under the heat exchanger then using a flat blade tool (Part No. 907736), scrape the flueway
fin surfaces in a downward movement. This will ensure that most of the deposits will be collected on the paper.
Burner
Brush the burner top and check that the flame ports are clear. Any blockage may be removed with a fine wire brush.
Turn the burner upside down and tap gently to remove any debris (Protect the electrode).
Electrode
If the electrode requires cleaning wipe the surface using a solvent.
Main Injectors
Omit this operation if the gas rate is correct, otherwise clean by blowing through. Do NOT clear the injector with a
pin or wire.
Fan Assembly
Examine the fan impellor and carefully clean if necessary.
Flue
Inspect the flue terminal and flue/air tube for blockage and integrity, rectify if necessary.
4.1 General Access
Warning: Before starting work, open the controls cover and set the temperature control knob to 'O' Off. Isolate the
electricity supply and if a gas carrying component is to be removed, isolate the gas supply at the appliance service cock.
Allow the boiler to cool.
Important: Always test for gas soundness after completing any exchange of gas carrying components and carry out a
functional check of the controls.
Re-assemble all parts in reverse order.
1. Remove the securing screw and slide off the controls cover. Put safely aside.