Annual Servicing - De Dietrich MS 24 MI FF Notice D'installation, D'utilisation Et D'entretien

To optimise boiler efficiency, 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 flame-sensing electrodes;
• check the state of the burner and make sure it is firmly fixed;
• 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 flue and air ducts are unobstructed.
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.
Drain the boiler by opening the drain tap.
In boilers MS 24 MI and MS 24 MI FF the drain tap is located at the bottom while for boilers MS 24 and MS 24 FF it is
next to the pump (1 – fig. 15).
To drain the boiler using the drain tap located at the bottom, proceed as follows (fig. 15):
- 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.
Figure 15
INSTALLATION INSTRUCTIONS

28. ANNUAL SERVICING

29. DRAINING THE BOILER CIRCUIT
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71.03982.03 - EN