Periodic maintenance is an "Warranty obligation" It is essential to the safety, efficiency and life of the
boiler It allows for the reduction of Gas consumption, polluting emissions and reliability over time.
Before starting;
close the fuel and water taps of the heating and domestic hot water system and isolate power supply.
To ensure product characteristics and efficiency remain intact and to comply with prescriptions of current regulations, it
is necessary to render the appliance to systematic checks at regular 12 monthly intervals.
This Includes the following tasks:
Check the ignition, switch-off and of the appliance, in both domestic water mode and heating mode
Check the seals of the gas, water and condensate connecting pipework
check the position and condition of the ignition electrode
Check the position and gap (between burner and tip of the detector electrode/ionization probe (see over A1)
After carrying out any component replacement, analysis of the combustion products should be carried out to make
sure it is operating correctly.
If, after replacing the electronic board or having carried out maintenance on the detector electrode or the burner, an analysis of
the combustion products returns values outside tolerances, it might be necessary to change the values as described in the sec-
tion "4.17 Combustion check in the appliance manual.
Note:
When replacing the Ionization electrode there can be slight variations of the combustion parameters that will fall
within nominal values after a few hours of operation.
BURNER / HEAT EXCHANGER & BURNER TUBE
Opening up the heat exchanger
Switch off the electrical supply by turning the system's main switch to "Off".
Close the gas shut-off valve.
Remove the burner cover casing by
1/ Disconnect the connecting cables of the electrodes.
2/ Disconnect the two power cables to the fan.
3/ Take out the spring retaining clip A of the gas pipe entering the fan mixer.
4/ Loosen the nut securing the pipe to the top of the Gas Valve and swing out the
pipe
5/ Remove the 4 nuts (C) that fix the combustion face plate
6/ Take out the air/gas conveyor assembly including the fan and mixer, be careful not to damage the insulating panel
and or the electrodes.
7/ Remove the condensate connecting pipe from the condensate drain fitting at the base of the Heat exchanger and
connect a temporary drain pipe.
Heat exchanger cleaning
1/ Vacuum out any dirt residues inside the heat exchanger, being careful NOT to damage the retarder insulating panel.
2/ Clean the coils of the heat exchanger with a soft / medium stiffness bristled brush. (do not use a wire brush)
3/ Clean the spaces between the coils
using 0.4 mm thick blade
, Vacuum away any residues produced
4/ Rinse with water, being careful NOT to damage the rear retarder insulating panel
5/ If there are obstinate combustion products on the surface of the heat exchanger, clean by spraying natural white
vinegar,
be careful NOT to damage the retarder insulating panel.
Leave to work for a few minutes and agitate with a brush.
6/ Clean the Burner blast tube with your Brush & ensure there are no blocked apertures.
Once the cleaning operations are finished, carefully reassemble all the components, following the above in-
structions in the reverse order. Turn the power and gas feeding to the boiler back on.
Mynute
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Boilers : Service requirements
