Service & Replacement Of Parts; Notes On Cleaning Boiler Components - Potterton Kingfisher Mf Installation & Service Instructions Manual

4. Service & Replacement of Parts
• For reasons of safety and economy the boiler should be serviced annually by a competent person.
• Before servicing, fire the appliance and check that the flames are blue and stable. Yellow flame and excessive
lifting indicate poor combustion.
WARNING: Before commencing work turn the temperature control knob to 'O' Stand-by 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.
Flue gas analysis points are provided as follows, RSL Models - either side of the flue elbow, CFL Models - on the Flue
Spigot. It is recommended that the flue gas probe is inserted so the tip is halfway into the flue so an accurate reading
can be obtained.
IMPORTANT: Ensure the Products Discharge Safety Device (TTB) is repositioned correctly, after the test and
secured to the dimension shown in Fig. 28.

Notes on Cleaning Boiler Components

Heat Exchanger - After performing operations 4.1, 4.6 & 4.8 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 such as methylated spirits.
Main Injector - 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 using a soft brush.
Flue - Inspect the flue terminal and flue/air tube for blockage and integrity, rectify if necessary.
Publication No. 5102977
Remember to fill in the Benchmark Log Book
CFL Models
Flue Gas Sample Point
(swing the T.T.B. out of the way)
RSL Models
Flue Gas
Sample Point
Fig. 24
Commissioning 25