Heating; Dosing; Pump Motor + Rotor; Pump Housing - BRAVILOR BONAMAT Aurora SINGLE LOW Operating Principle

3.5

Heating

Now the system has been completely filled with water, a relays will enable the element.
The machine has been provided with a smart boiler routine, which basically works as follows:
• The lower temperature sensor measures the current temperature of the water.
The temperature sensor makes sure that the water in the boiler is heated to the desired final
temperature.
• The centre temperature sensor is responsible for releasing or not releasing the selections
volume 2 and volume 3 for dosing.
• The upper temperature sensor is responsible for releasing or not releasing the volume 1
selection for dosing (if set, the airpot selection will be released as well).
• The heating switches off when the set temperature has been reached. Hot water has a lower
specific weight than cold water. As a result, the hot water in the boiler will not flow back to the
float tank through the siphon hose at the bottom. Therefore this part of the system will remain
cold. This is very important because the parts in the float tank are sensitive to scaling.
3.6

Dosing

Dosing takes place when:
• The float is in the upper position.
• The uppermost temperature sensor measures a temperature higher than the blocking
temperature.
• After having started a recipe, the pump motor (Fig.7) will for a certain period be controlled with
a set speed (rpm), dependent on the programmed recipe.
Fig.7 Pump motor + rotor
• The pump rotor rotates in the pump chamber that has been filled with water.
This is formed by the bottom of the float tank and the bottom of the pump housing (Fig.8).
• The pump rotor pumps the water out of the pump chamber through the siphon hose at the
bottom of the boiler.
• This presses the hot water out of the boiler.
• The float and the magnetic valve make sure that the correct level of water in the float tank is
maintained and so water remains in the pump chamber.
6
Fig.8 Pump housing