11. Hardware Protection; Overflow Protection; Back-Flow Protection; Boiling Protection - BRAVILOR BONAMAT Aurora SINGLE LOW Operating Principle

11. Hardware protection

The machine has a number of so-called hardware protections.
These protections prevent dangerous situations from occurring, such as overheating and/or water
in the machine.
11.1

Overflow protection

This protection is found in the float tank and ensures that excess water caused by a too high
water level flows to the bottom of the machine through the overflow and hose.
11.2

Back-flow protection

A pipe in the float tank sprays the water coming from the magnetic valve against the cover of the
float tank. The water then flows into the float tank. This prevents water from flowing back into the
system and ending up in the water pipe when the water pressure on the magnetic valve drops.
11.3

Boiling protection

The element is controlled by a relay on the mainboard.
A safety relay is connected to this relay in series.
If an error occurs and the element is still under voltage, the safety relay will interrupt the voltage
(see electrical circuit diagram) and prevent the machine from boiling dry.
11.4

Boil-dry protection

The boil-dry protection has been mounted onto the element and to the outside of the boiler using
a number of Clixons.
The number of Clixons is type-dependent and varies with the number of elements in the machine.
If for any reason the control does not switch off the boiler, the Clixons will make sure that the
voltage on the element is mechanically switched off and so prevent overheating.
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