De-dietrich MS 24 BIC User Manual download pdf (Page 80)

71.06199.02 - EN

INSTALLATION INSTRUCTIONS

To optimise boiler efciency, carry out the following annual controls:

• check the appearance and air-tightness 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;

• check the fan works correctly;

• make sure the ue and air ducts are unobstructed.

• check the state of the boiler anode.

WARNINGS

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

Afterwards, move the knobs and/or operating parameters of the boiler to their original positions.

28. ANNUAL SERVICE

TIPS

For the efcient operation of the expansion vessel, the pressure of the water supply must be lower than 4 bar. If it is not,

install a pressure reducer. Adjust the pressure reducer to obtain a water supply pressure less than 4 bar.

DRAINING THE BOILER CIRCUIT

Drain the boiler by opening the tap in the hydraulic assembly.

To drain the boiler using the drain tap located at the bottom, proceed as follows (g. 14):

- close the boiler on/off valves;

- open the drain tap using an 8 mm hex wrench;

- drain the boiler;

- close the drain tap using the 8 mm hex wrench.

29. DRAINING THE BOILER CIRCUIT AND THE STORAGE BOILER

Figure 14

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De-dietrich MS 24 BIC User Manual Page 80