Turning Off The Boiler; Gas Conversion; Prolonged Shutdown. Frost Protection - DeDietrich MS 24 BIC FF Operating And Installation Instructions

Figure 2
The boiler is fitted with a hydraulic pressure gauge which prevents the boiler from working if there is no water.
N.B.:
In case pressure drops occur frequently, have the boiler checked by an authorised Service Engineer.
To turn off the boiler, disconnect the electric power supply. In "OFF" mode (section 5) the boiler remains off (the display
indicates OFF) though the electrical circuits remain live and the frost protection device is enabled (section 9).
The boilers can operate both on natural gas and LPG.
All gas conversions must be made by an authorised Service Engineer.

9. PROLONGED SHUTDOWN. FROST PROTECTION

Do not drain the whole system as filling up with water again causes unnecessary and harmful scale to build up inside the
boiler and the heating elements. If the boiler is not used during winter and is therefore exposed to the danger of frost, add
some specific anti-freeze to the water in the system (e.g.: propylene glycol coupled with corrosion and scale inhibitors).
The electronic boiler management system includes a "frost protection" function for the heating system which, when delivery
temperature falls below 5°C, operates the burner until a delivery temperature of 30°C is reached.
The frost protection function is enabled if:
* the boiler is electrically powered;
* the gas tap is open;
* the system is at the correct pressure;
* the boiler is not blocked.
OPERATING INSTRUCTIONS

7. TURNING OFF THE BOILER

8. GAS CONVERSION

63
A: System emptying tap
B: Boiler emptying tap
C: System filling tap
D: Pressure gauge
71.06199.02 - EN