DISMANTLING THE BURNER
- Close the gas supply valve.
- Open the top front panel of the boiler.
- Remove the fan plug (24 Volt), the ignition cable, the gas valve control
and the ignition electrode earth.
- For easier access, you can also remove the flap located on the top
panel of the boiler.
- Unscrew the 4 nuts of the burner using a socket and ratchet.
- Unscrew the three-piece connection of the gas pipe.
- Lift the burner, the fan and the gas valve out in one piece and remove
them from the exchanger. Take care not to damage the burner’s
insulation, which is inside the exchanger.
- Check the condition of the insulation and the seals and replace
them systematically, then put the burner back following the above
procedure in reverse order.
CLEANING THE EXCHANGER
- Dismantle the burner as described above.
- Remove the burner insulation.
- Use a vacuum cleaner to clean out the chamber.
- It may also be necessary to pour water into the cylinder in order to
clean out any foreign bodies located in the flue ducts.
After doing this, it is essential that the condensate trap is cleaned.
- Check the burner’s insulation and seal and replace if necessary.
- Check the electrode and replace if necessary.
- Reassemble the burner and check for any leaks.
- Power the appliance on again. Set the appliance to maximum power
mode and check for burned gas leaks.
- Check the gas pressure and the CO
2
setting using the method
described in the previous section.
DISASSEMBLING AND INSPECTING
THE ELECTRODE
- Remove the ignition cable.
- Remove the two retaining screws.
- Disconnect the earth connection from the electrode and make sure
that the lock washer is fastened between the earth cable and the
electrode during assembly.
- Check the condition of the seal and replace it if required, then put the
electrode back following the above procedure in reverse order.
X 4
COMMISSIONING AND MAINTENANCE
3 mm
5 mm
3 mm
HeatMaster
®
25 / 35 TC
HeatMaster
®
25 / 35 TC
EN • 21
664Y5300 • A
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