Beretta MYNUTE GREEN 50 R.S.I. Manuel D'utilisation page 9

JP4 Do not use
JP5
Heating only function with a predisposition for external storage tank
with thermostat (JP8 inserted) or probe (JP8 not inserted)
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 Management of an external storage tank with thermostat enabled
(jumper inserted)/ management of an external storage tank with pro-
be (jumpers not inserted) (fig. 48b).
The boiler foresees jumpers JP5 and JP8 inserted as standard (heating
only version arranged for storage tank with thermostat); if the use of an
exterior storage tank with probe is required, jumper JP8 must be removed.
4.6 Setting the thermoregulation (graphs 1-2-3 fig. 51)
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 dia-
gram).
To access P3:
- remove the housing
- loosen the fixing screw on the instrument panel
- turn the instrument panel towards you
- loosen the fixing screws on the terminal board cover
- unhook the board casing.
Live electrical parts (230 V AC).
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 tem-
perature 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 +5 and -5°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 sen-
sor, 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 HEAT-
ING SET-POINT value available, but a value that you can set as preferred
between +5 and -5°C.
The modification of this value will not directly modify the delivery tempera-
ture, 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 produc-
tion. If the adjustments need to be made again, for example after extraordi-
nary maintenance, replacement of the gas valve, or conversion from meth-
ane 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
- turn the heating water temperature selector to its maximum
- loosen the fixing screws (E) on the instrument panel (fig. 20)
- lift then turn the instrument panel towards you
- loosen the fixing screws on the cover (F) to access the terminal board
(fig. 22)
- insert the jumpers JP1 and JP3 (fig. 50)
- power up the boiler.
The three LEDs on the instrument panel flash simultaneously and the dis-
play 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. 37) and then skip to the calibration of the next
parameter.
Live electrical parts (230 V AC).
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
- waiting for 15 minutes after it is connected.
Calibration can be carried out without switch on 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 calibration parameter display function is activated with the selector on
summer or winter - press CO button (on the card) regardless of whether
or not there is a heat request. The function cannot be activated if a remote
control is connected.
When this function is activated, the calibration parameters each appear (in
the order shown below) for 2 seconds. The relative icon is indicated in line
with each parameter, and the fan rotation value (expressed in hundreds)
1. Maximum
2. Minimum
3. Maximum heating
4. Slow ignition
5. Maximum heating adjusted
GAS VALVE CALIBRATION
- Connect the boiler to the power supply.
- Open the gas tap.
- Set the function selector to
- Loosen the screws (E), remove the housing, then lower the instrument
panel towards you (fig. 20).
- Loosen the fixing screws on the cover (F) to access the terminal board
(fig. 22).
- Press the CO button (fig. 37).
Live electrical parts (230 V AC).
- Wait for burner ignition.
The display shows "ACO" and the yellow LED flashes. The boiler oper-
ates at maximum heat output.
The "combustion analysis" function remains active for a limited time (15
min); if a delivery temperature of 90°C is reached, the burner is switched
off. It will be switched back on when this temperature drops below 78°C.
(OFF/RESET)
(OFF/RESET) (monitor off).
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