Annual Servicing; Draining The Heating Circuit - DeDietrich ZENA MS 24 MI FF Operating And Installation Instructions

To optimise boiler ef ciency, carry out the following annual controls:
Use a vacuum cleaner to do this;
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 – g. 15).
To drain the boiler using the drain tap located at the bottom, proceed as follows ( g. 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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71.06952.02 - EN