Beretta MYNUTE BOILER GREEN 25 B.S.I. E Para El Instalador página 10

ENGLISH
4.5 Boiler configuration
The electronic board contains a series of jumpers (JP4) that can be
used to configure the boiler.
To access the board, proceed as follows:
- 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
JUMPER JP7 - fig. 16:
preselection of the most suitable heating temperature adjustment
field according to the installation type.
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 installa-
tions (see above)
JP8 Do not use
4.6 Setting the thermoregulation (graphs fig. 17)
The thermoregulation only operates with the external sensor con-
nected; once installed, connect the external sensor (accessory avail-
able on request) to the special terminals provided on the boiler ter-
minal board.
This enables the THERMOREGULATION function.
Selecting the compensation curve
The compensation curve for heating maintains a theoretical tem-
perature of 20°C indoors, when the external temperature is be-
tween +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 near-
est 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.
10
The delivery temperature is automatically calculated by the boiler,
although the user may modify the boiler settings. Using the inter-
face 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 in-
serted)
With the contact closed, the heat request is made by the delivery
sensor, on the basis of the external temperature, to obtain a nomi-
nal indoor temperature on DAY level (20°C). With the contact open,
the boiler is not switched off, but the weather curve is reduced (par-
allel 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 de-
termines the value of that temperature, altering the reference tem-
perature 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 pro-
cedures.
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 per-
sonnel 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. 9) 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 automati-
cally shows the number of rotations, expressed in hundreds
(e.g. 25 = 2,500 rpm).
(OFF/RESET)