BRAVILOR BONAMAT Aurora Single Low Instruction sheet

OPERATING PRINCIPLE
Thermal brewers
Aurora
SINGLE LOW (SGL) TWIN LOW (TWL)
SINGLE HIGH (SGH) TWIN HIGH (TWH)

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No part of this document may be copied and/or published by means of printing, photocopy, microlm or by any
other means without the prior written consent of the manufacturer. This also applies to the included drawings and/or
diagrams.
The information in this document is based on data that was available at the time the design, the material
characteristics and the operating methods were published, meaning that this document is subject to change. For
this reason the instructions given only serve as a guideline for installation, maintenance and repair of the machine
mentioned on the cover of this document.
This document applies to the standard version of this machine. The manufacturer therefore declines all liability for
any damage arising from specications that deviate from the standard version of the machine delivered to you.
This document has been compiled with the utmost care. However, the manufacturer cannot be held liable for any
errors it contains or the consequences thereof.

Table of Contents
1. General operation .......................................................1
2. Water dosing system .....................................................2
3. Start up ................................................................4
3.1 Initialisation ...........................................................4
3.2 Installation............................................................4
3.3 Fill ..................................................................4
3.4 Boiling point determination programme .....................................5
3.5 Heating ..............................................................6
3.6 Dosing...............................................................6
4. Extract .................................................................9
5. Recipes ...............................................................10
5.1 Recipe settings .......................................................10
5.2 Recipe build-up .......................................................11
5.3 Default recipes .......................................................11
5.4 Programme recipes....................................................12
5.5 Adjust recipes ........................................................12
5.6 Upload/download recipes ...............................................12
6. RFID..................................................................13
7. Hot water tap ..........................................................14
7.1 Tap hot water while making coffee ........................................14
8. Descaling signal........................................................15
8.1 Descaling signal set based on the hardness of the water.......................15
8.2 Active descaling signal .................................................15
9. Switched-mode power supply ............................................16
9.1 Operation of switched-mode power supply..................................16
10. Operating system.......................................................17
10.1 Touch screen display ..................................................17
10.2 Mainboard ...........................................................17
11. Hardware protection ....................................................18
11.1 Overow protection ....................................................18
11.2 Back-ow protection ...................................................18
11.3 Boiling protection .....................................................18
11.4 Boil-dry protection .....................................................18
12. Software protection .....................................................19
13. Programming ..........................................................21
13.1 User menu ..........................................................21
13.2 Chief menu ..........................................................22

Table of Figures
Fig.1 Water dosing system ....................................................2
Fig.2 Hot water outlet.........................................................2
Fig.3 Float tank .............................................................3
Fig.4 Boiler.................................................................3
Fig.5 Hot water selector.......................................................3
Fig.6 Boiling point determination programme ......................................5
Fig.7 Pump motor + rotor......................................................6
Fig.8 Pump housing..........................................................6
Fig.9 Encoder ..............................................................7
Fig.10 Water selector intern.....................................................7
Fig.11 Water distribution disc with magnets ........................................7
Fig.12 Bypass ...............................................................7
Fig.13 Position for coffee .......................................................8
Fig.14 Water selector components ...............................................8
Fig.15 Recipe build-up........................................................11
Fig.16 Place for holding the RFID card ...........................................13
Fig.17 Hot water tap .........................................................14
Fig.18 Hot water hose connections ..............................................14
Fig.19 Descaling setting table ..................................................15
Fig.20 Water hardness conversion table ..........................................15
Fig.21 Switched-mode power supply.............................................16
Fig.22 Touch screen display ...................................................17
Fig.23 Display with error message ..............................................19

1
1. General operation
The machine works according to a pump system developed by Bravilor Bonamat.
This system has the following advantages:
• Many of the parts ensuring correct dosing of the water are in a cold water circuit.
This minimises the main cause of failures, being the forming of scale on the dosing valves.
• The oat regulating the water level is also in the cold water circuit.
This also minimises scaling.

2
2. Water dosing system
After having started a selection, the pump motor is controlled with a regulated time and speed.
The pump rotor moves a certain amount of cold water from the cold water reservoir to the bottom
of the boiler. This pushes the hot water in the boiler up towards the water selector. This selector
chooses its position by means of a rotating movement. Dependent on the recipe, the water
selector will also dose through the bypass and therefore choose a different position.
5
4
3
2
1
Fig.1 Water dosing system
C
B
A
Fig.2 Hot water outlet

3
The water dosing system consists of the following main components:
1. Magnetic valve
2. Hot water outlet (Fig.2)
2a. Hot water outlet
2b. Tap including switch
2c. Hot water valve
3. Float tank (Fig.3)
3a. Float
3b. Pump motor
3c. Pump rotor
3d. Encoder
4. Boiler (Fig.4)
4a. Element
4b. Temperature sensor (NTC)
4c. Clixon
5. Hot water selector (Fig.5)
5a. Water selector motor
5b. Water distribution disc
5c. Hall sensor
5d. Top cover water selector (including
electrodes for scaling detection)
D
A
B
C
Fig.3 Float tank
A
C
B
Fig.4 Boiler
D
C
B
A
Fig.5 Hot water selector

4
3. Start up
3.1 Initialisation
The machine is switched on using the main switch. The display shows the version number of
the software downloaded in the factory and after this the display will show all symbols and “init”
to indicate that the machine starts initialisation. During this initialisation, the machine will run a
standard routine to make sure that a number of essential components have been connected and
are operating correctly. The machine will generate an error when a component has not been
connected for any reason or is defective. When everything goes well, this process will take about
15 seconds.
3.2 Installation
When switching on the machine for the rst time, the installation programme “rst start” must be
run. The machine will have to run its boiling point determination programme and while running
this programme, hot water can come out of the outlet (see 3.4). Calibrate the pump motor after
having run the boiling point determination programme.
This calibration will take place in 2 steps:
1. The machine will calibrate the pump motor for dosing on the coffee.
The machine will dose through the lter pan. Collect the quantity of water to be dosed and
enter this into the display.
Repeat the procedure when the quantity deviates too much.
2. The machine will now calibrate the pump motor for dosing on the coffee and tapping hot
water at the same time.
The machine will now dose through the lter pan as well as through the hot water tap.
Collect the quantity dosed through the lter pan and enter this quantity in the display.
Repeat the procedure when the quantity deviates too much.
When both calibrations have been done, the machine is ready for use.
3.3 Fill
The oat tank and the boiler are connected by a siphon hose. Together they form communicating
vessels.
When the machine is switched on for the rst time, the oat tank is (Fig.3) empty and the oat
(Fig.3,A) is its low.
• The magnetic valve (Fig.1) is opened and lls the oat tank with a pressure-independent
speed with water. This lling speed is type-dependent, being 5 litres per minute for the Twin
version and 6 litres per minute for the Single version.
• The water in the oat tank runs through the hose below the oat tank to the boiler.
• After the water level has pushed up the oat, the water level in the oat tank is equal to that of
the boiler. The magnetic valve is switched off.
If the machine is a Twin version, the other side will now be lled following the same procedure.
Note:
► As the oat tank lls up faster than the water ‘drops’ into the boiler, the lling process will
take place with short intervals.

5
3.4 Boiling point determination programme
Hot water may come out of the lter pan while running this programme.
The machine automatically only runs the boiling point determination programme when using the
machine for the rst time. The boiling point of the water is now determined. This is necessary
because the boiling point depends on the local atmospheric pressure. The boiling point at sea
level will be about 100°C, whereas the boiling will drop to about 97°C at an altitude of 2000m.
After having switched on the mains voltage, the water in the boiler will rst be heated to about
75°C at full power (Fig.6,A).
Then the water in the boiler will be heated with reduced power to 85°C. During this period, the
software will measure how quickly the water is heated.
Based on this measurement, the machine will heat up with a certain power until the temperature
sensor on the outside of the boiler has not detected a temperature change for some minutes
(Fig.6,B). After this period, the boiling point has been reached and the measured value is saved in
the software.
The nal operating temperature in the boiler will be 3°C below this point. Because the boiling
point of water depends on the atmospheric pressure, it is necessary to run this programme at the
location where the machine will be used. During the boiling programme, the display shows the
current temperature with below this a ashing thermometer and a changing, increasing volume.
After a certain period (dependent on the power the machine has been connected to), the
thermometer stops ashing to indicate that the boiling point has been determined.
Note:
► While running the boiling point determination programme, it is very important that no
panels have been removed from the machine.
The fact is that this may inuence the measurement and so cause a deviation in the
temperature during normal use.
0
10
20
30
40
50
60
70
80
90
100
110
T (ºC)
t
B
A
Fig.6 Boiling point determination programme

6
3.5 Heating
Now the system has been completely lled 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 nal
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
specic weight than cold water. As a result, the hot water in the boiler will not ow back to the
oat 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 oat tank are sensitive to scaling.
3.6 Dosing
Dosing takes place when:
• The oat 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 Fig.8 Pump housing
• The pump rotor rotates in the pump chamber that has been lled with water.
This is formed by the bottom of the oat 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 oat and the magnetic valve make sure that the correct level of water in the oat tank is
maintained and so water remains in the pump chamber.