Beretta MYNUTE BOILER GREEN B.S.I. E Manuel D'utilisation Et D'installation page 9

Jumper not inserted - standard installation
Standard installation 40-80°C
Jumper inserted - floor installation
Floor installation 20-45°C.
In the manufacturing phase, the boiler is configured for standard
installations.
JP1 Calibration (Range Rated see paragraph on "Adjustments")
JP2 Reset heating timer
JP3 Calibration (see paragraph on "Adjustments")
JP4 Do not use
JP5 Do not use
JP6 Enable night-time compensation function and continuous
pump (only with external sensor connected)
JP7 Enable management of low temperature/standard installations
(see above)
JP8 Do not use
4.6 Setting the thermoregulation (graphs fig. 17)
The thermoregulation only operates with the external sensor
connected; once installed, connect the external sensor (accessory
available on request) to the special terminals provided on the boiler
terminal board.
This enables the THERMOREGULATION function.
Selecting the compensation curve
The compensation curve for heating maintains a theoretical
temperature of 20°C indoors, when the external temperature is
between +20°C and -20°C. The choice of the curve depends on
the minimum external temperature envisaged (and therefore on the
geographical location), and on the delivery temperature envisaged
(and therefore on the type of system). It is carefully calculated by
the installer on the basis of the following formula:
envisaged delivery T. - Tshift
KT=
20- min. envisaged external T.
Tshift = 30°C standard installations
25°C floor installations
If the calculation produces an intermediate value between two
curves, you are advised to choose the compensation curve nearest
the value obtained.
Example: if the value obtained from the calculation is 1,3 this is
between curve 1 and curve 1,5. Choose the nearest curve, i.e. 1,5.
Select the KT using trimmer P3 on the board (see multiwire wiring
diagram).
To access P3:
- switch off the power supply
- remove the shell
- turning the instrument panel towards you
- unscrew the two screws of the small cover on the electronic
board to have access to the terminals
Live electrical parts (230 Vac).
The KT values which can be set are as follows:
standard installation: 1,0-1,5-2,0-2,5-3,0
floor installation 0,2-0,4-0,6-0,8
and these are displayed for approximately 3 seconds after rotation
of the trimmer P3.
TYPE OF HEAT REQUEST
Boiler connected to room thermostat (JUMPER 6 not inserted)
The heat request is made by the closure of the room thermostat
contact, while the opening of the contact produces a switch-off.
The delivery temperature is automatically calculated by the boiler,
although the user may modify the boiler settings. Using the interface
to modify the HEATING, you will not have the HEATING SET-
POINT value available, but a value that you can set as preferred
between 15 and 25°C. The modification of this value will not directly
modify the delivery temperature, but will automatically affect the
calculation that determines the value of that temperature, altering
the reference temperature in the system (0 = 20 °C).
Boiler connected to a programmable timer (JUMPER JP6
inserted)
With the contact closed, the heat request is made by the delivery
sensor, on the basis of the external temperature, to obtain a nominal
indoor temperature on DAY level (20°C). With the contact open, the
boiler is not switched off, but the weather curve is reduced (parallel
shift) to NIGHT level (16°C).
This activates the night-time function.
The delivery temperature is automatically calculated by the boiler,
although the user may modify the boiler settings.
Using the interface to modify the HEATING, you will not have the
HEATING SET-POINT value available, but a value that you can set
as preferred between 25 and 15°C.
The modification of this value will not directly modify the delivery
temperature, but will automatically affect the calculation that
determines the value of that temperature, altering the reference
temperature in the system (0 = 20°C for DAY level, and 16°C for
NIGHT level).
4.7 Adjustments
The boiler has already been adjusted by the manufacturer during
production. If the adjustments need to be made again, for example
after extraordinary maintenance, replacement of the gas valve,
or conversion from methane gas to LPG, observe the following
procedures.
The adjustment of the maximum and minimum output, and of
the maximum and minimum heating and of slow switch-on, must
be made strictly in the sequence indicated, and only by qualified
personnel only:
- disconnect the boiler from the power supply
- remove the shell
- turning the instrument panel towards you (fig. 8)
- unscrew the two screws of the small cover on the electronic
board to have access to the terminals
- insert the jumpers JP1 and JP3
- power up the boiler.
The display shows "ADJ" for approximately 4 seconds.
Next change the following parameters:
1 - Domestic hot water/absolute maximum
2 - Minimum
3 - Heating maximum
4 - Slow switch-on
as follows:
- turn the heating water temperature selector to set the required
value
- press the CO button (fig. 9a) and then skip to the calibration of
the next parameter.
Live electrical parts (230 Vac).
The following icons light up on the monitor:
1. during domestic hot water/absolute maximum calibration
2. during minimum calibration
3. during heating maximum calibration
4. during slow switch-on calibration
End the procedure by removing jumpers JP1 and JP3 to store
these set values in the memory.
the function can be ended at any time without storing the set values
in the memory and retaining the original values as follows:
- remove jumpers JP1 and JP3 before all 4 parameters have been set
- set the function selector to
- cut the power supply 15 minutes after it is connected.
Calibration can be carried out without powering up the boiler.
By turning the heating selection knob, the monitor
automatically shows the number of rotations, expressed in
hundreds (e.g. 25 = 2,500 rpm).
The function for visualizing the setting parameters is activated by
the function selector in summer and in winter, by pressing the CO
button on the circuit board, either with or without request for heat.
This function cannot be activated when connected to a remote
control.
Upon activating the function the setting parameters are visualized
in the order given below, each for 2 seconds. Each parameter is
displayed together with its corresponding icon and fan rotation
speed measured in hundreds
Mynute Boiler Green B.S.I. E
(OFF/RESET)
9