10. Built-in devices 149
To activate
• Push in the knob at position (m) slightly and, at the same
time, move it 90° towards position (k).
• If the switch is in position (k), the knob will remain in
position (m).
To deactivate
• Turn the switch at position (k) by 90° so that it is parallel
to the frost control.
• At the same time, the knob will jump from position (m)
to (n).
The drain valve can only be closed manually using the
push button (Position m) and the boiler lled if the valve
temperature is above approx. 7°C.
If the temperature of the safety/drain valve is lower than
approx. 3°C, the push button will be ejected (Position n)
and the contents of the boiler will be drained o via the
drain outlet (o).
k
Safety valve for boiler (Frost Control)
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