Instruction manual

7108686.02 (1-11/12) 18

I N S T A L L E R S e c t i o n ( e n )

18. ANNUAL SERVICING

The service must be performed only by qualied and competent staff in accordance with the Gas safety, Installation and use re-

gulations. In UK this person need to be approved by the Health and Safety Executive. To optimise boiler efciency, carry out the

following at the annual service:

• Check the appearance and airtightness of the gaskets of the gas and combustion circuits;

• Check the state and correct position of the ignition and ame-sensing electrodes;

• Check the state of the burner and make sure it is rmly xed;

• Check for any impurities inside the combustion chamber. Use a vacuum cleaner to do this;

• Check the gas valve is correctly calibrated;

• Check the pressure of the heating system;

• Check the pressure of the expansion vessel (system);

• Check the fan works correctly;

• Make sure the ue and air ducts are unobstructed;

• Check for any blockages inside the siphon.

Before commencing any maintenance operations, make sure the boiler is disconnected from the power supply. After servicing,

reset the original operating parameters of the boiler if they were changed.

18.1 CLEAN THE HEAT EXCHANGER

Before starting to disassemble the heat exchanger protect the electronic box and all the electrical components against sprayed

water.

Proceed as follows to dismount the Heat Exchanger:

• Isolate the unit from the electrical mains (disconnect the boiler from

the main elecrical supply).

• Cut off the gas supply to the boiler.

• Close the maintenance taps on the boiler.

• Remove the front cover trom the boiler.

• Unscrew the screw securing the electrical box, lower it and protect

it from splashing water.

• Remove the Ignition electrode and the ame detection probe.

• Remove the Assembly Fan-Mixer

• Clean the pipes (1) of the heat exchanger using regular vinegar.

Flush with water. The water ows out of the heat exchanger throu-

gh the water condense trap.

• Wait for approx. 20 minutes than ush away the dirt particles with a

powerfuf water jet. Avoid pointing the water jet directly at the insu-

lating surface (2) on the back of the heat exchanger.

18.2 CHECKING THE BURNER

The burner needs no cleaning.

• Check the burner surface for damage, replace the burner if neces-

sary.

• Check the positioning of the ame detection probe.

• Verify that the distance of the ignition electrode is within tolerance

as shown in the gure.

• Check that the burner surface insulation in the burner ange it is

not damaged otherwise replace it.

Connect the gas supply with a new gasket. Open the gas supply and check the boiler for gas leaks using a leak testing spay.