Hot Water Tap; Tap Hot Water While Making Coffee; Fig.17 Hot Water Tap; Fig.18 Hot Water Hose Connections - BRAVILOR BONAMAT Aurora SINGLE LOW Operating Principle

7.

Hot water tap

The Aurora has a hot water tap (Fig.17).
This tap can be found on the front side of the machine.

Fig.17 Hot water tap

Fig.18 Hot water hose connections

The hot water tap has been connected to the same boiler as used for the coffee. With a Twin
version this will be connected to the left boiler. The temperature of the hot water is determined by
the setting of the used default recipe for coffee.
Operating the lever of the tap activates a switch behind the panel. This will generate a signal to
the mainboard which in its turn will open the hot water valve and control the pump motor. Then
hot water will flow out of the hot water outlet. The float and the magnetic valve make sure that the
level in the float tank is maintained, so there will always be water in the hot water hose. As soon
as the lever is released, the hot water valve will close and the pump motor will be switched off.
In order to make sure that the water in the hose between the boiler and the valve does not cool
down when no hot water is tapped for some time, 2 hoses have been connected from the boiler
(Fig.18) to a Y-piece for the hot water valve. The thickest hose is connected highest on the boiler;
the thin hose is connected to the boiler about 15cm lower. As soon as the hot water valve is
closed, the water will start circulating. This will happen because the colder surrounding air will
cool the water in the hose. The cooled water will flow back into the boiler and the hot water will
flow from the boiler into the other hose. In this way the temperature of the water will remain more
or less constant.
7.1

Tap hot water while making coffee

As for making coffee and for tapping hot water the same pump motor and boiler are used,
normally the dosing would deviate. Still it is possible to tap hot water while making coffee without
causing a deviation in the dosing.
While making coffee the pump motor runs at a certain speed.
When hot water is tapped and the pump motor maintains its speed, the dosing for the coffee
would change.
This problem is solved by simultaneous calibration of the dosing during the first installation.
When the calibration has been performed correctly, the pump motor will start running faster at
the moment that simultaneous dosing takes place. When, for example, coffee is made, the pump
motor runs at a certain speed. When the hot water tap is operated too, the pump motor will start
running at a higher speed to make sure that no dosing deviations will occur. The pump motor will
start running at its lower speed again after the hot water tap has been released.
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