Beretta Mynute J 24 R.S.I. Installer And User Manual page 6

ENGLISH
When the new value is reached, other 20 minutes count begins.
If during this period the ambient thermostat still requests heat, the value of the
set temperature automatically increases by 5 °C.
This new temperature value is the result of the temperature set manually with the
heating water temperature selector and the increase of +10 °C of the S.A.R.A
function
After the second increasing cycle, the temperature value is restored to the value
set by the user and the above mentioned cycle is repeated until the ambient
thermostat request is fulfilled.
Fixed green
If there is a flame, the boiler works regularly.
Red led
If the red LED lights up, this indicates the presence of a fault; the monitor visualises
a code interpreted as follows:
A 01 flame failure (fixed red LED + flame failure icon "
A 02 limit thermostat intervention (blinking red LED)
A 03 differential air pressure switch intervention (fixed red LED)
A 04 water pressure switch after the transitory phase (fixed red LED + filling
icon " ")
A 07 heating NTC probe (fixed red LED)
To restore operation: faults A 01-02-03
Position the function selector on "
the required position. If the reset attempts do not reactivate the boiler, contact
the Technical Assistance Centre.
Fault A 04
Along with the fault code, the digital monitor visualises the "
the pressure value indicated by the hydrometer: if it is less than 0.3 bar, position
the function selector on (OFF) and adjust the filling tap (outside the boiler)
until the pressure reaches a value between 1 and 1.5 bar. Then turn the function
selector to the required position. If these pressure drops occur frequently, contact
the Technical Assistance Centre.
Fault A 07
Contact the Technical Assistance Centre.
4.5 Adjustments
The boiler has already been adjusted by the manufacturer.
If it is necessary to adjust it again, for example after extraordinary maintenance,
after replacement of gas valve or after gas conversion, carry out the following
procedure.
The maximum output adjustment must be carried out in the sequence
indicated exclusively by qualified personnel.
- remove the shell unscrewing the fixing screws A (fig. 15)
- unscrew by two turns the screw of the pressure test point downstream the gas
valve and connecting the pressure gauge
- disconnect the compensation inlet of the air distribution box
4.5.1 Maximum and minimum power adjustment
On the control panel:
- Set the function selector to
- Remove the housing and access the card
- Insert the jumpers JP1 and JP2
- Use a screwdriver to prise open the plug on the control panel (fig.17)
- Bring the trimmer P2 to the maximum value, using a screwdriver (turn clock-
wise)
- Power the boiler setting the system main switch to "on"
- Check the pressure on the pressure gauge is stable; or, with a milliammeter
in series to the modulator, make sure the modulator supplies the maximum
available current (120 mA for G20 and 165 mA for LPG)
- Use a screwdriver to carefully prise out the protection cap of the adjustment
screws
- With a fork spanner CH10, use the adjustment nut of the maximum output in
order to obtain the value indicated in the table on page 9
- Disconnect the modulator faston
- Wait until the pressure on the pressure gauge is stable at minimum value
- Use an Allen spanner to set the red adjustment screw at the minimum output,
calibrating it until the pressure gauge shows the value indicated in the table
on page 9
- Reconnect the modulator faston
- Disconnect the boiler from the power supply
- Remove the jumpers JP1 and JP2
- Carefully refit the protection cap of the adjustment screws.
4.5.2 Minimum and maximum heating electric adjustment
The "electric adjustment" function is activated and deactivated exclusively
by the jumper (JP1) (fig. 18).
The green and red LEDs on the command panel blink alternately.
The function can be enabled in the following way:
- by powering the card with the jumper JP1 inserted and the mode selector in win-
ter position, regardless of the possible presence of other operation requests
- by inserting the jumper JP1, with the mode selector in winter position, without
any heat request in progress.
6
")
" OFF, wait for 5-6 seconds, then turn it to
" symbol. Check
(winter) (fig. 16)
By activating the function the burner is ignited through simulation of heat
request in heating.
To perform calibration operations, proceed as follow:
- switch off the boiler
- remove the shell and access the card
- insert the jumper JP1 (fig. 18) to enable the knobs placed on the control panel
to the minimum and maximum heating adjustment functions.
- make sure that the mode selector is in winter position (see section 4.2).
- power the boiler
Electric card in voltage (230 Volt)
- turn the heating water temperature adjustment knob (fig.19) until it reaches the
heating minimum value, as indicated in the multigas table on page 9
- insert the jumper JP2 (fig. 18)
- use a screwdriver to prise open the plug on the control panel (fig.17)
- use a screwdriver to bring the trimmer P2 to the maximum value, as indicated
in the table on page 9
- remove the jumper JP2 to store the heating maximum value
- remove the jumper JP1 to store the heating minimum value and to get
out the calibration procedure
- reconnect the compensation inlet to the air distribution box
Disconnect the pressure gauge and retighten the pressure test point screw.
To finish the calibration function without storing the set values, proceed as
follows:
a) set the mode selector to position
b) remove power supply voltage
c) remove JP1/JP2
The calibration function is automatically finished, without storing minimum
and maximum values, after 15 minutes of its activation.
The function is automatically finished also in case of definitive stop or
lockout.
Also in this case, function conclusion DOES NOT provide values storing.
Note
To calibrate only maximum heating, it is possible to remove the jumper JP2 (to store
the maximum) and then get out from the function, without storing the minimum,
setting the mode selector to (OFF) or removing the voltage from the boiler.
After each intervention on the adjustment element of the gas valve, seal
it with sealing varnish.
When adjustment is complete:
- restore set temperature with the ambient thermostat to the desired tempera-
ture
- set the heating water temperature selector to the desired position
- close the instrument panel
- pull the shell back in place.
4.6 Gas conversion operations
Conversion from a family gas to other family gas can be performed easily also
when the boiler is installed.
The boiler is designed to operate with methane gas (G20) according to the
product label.
It is possible to convert the boilers from one gas type to another by using the
appropriate kit supplied upon request:
- Methane conversion kit
- LPG conversion kit
For disassembly refer to instructions below:
- remove power supply from the boiler and close the gas tap
- remove in sequence: shell, air distribution box cover and combustion chamber
cover (fig. 20)
- disconnect the spark plug cable connection
- slide off the lower cable grommet from the seat of the air distribution box
- remove the burner fixing screws and remove the latter with the spark plug at-
tached and corresponding cables
- using a socket or fork spanner, remove the nozzles and the washers and replace
them with the ones in the kit (fig. 21).
Use and assemble the washers contained in the kit also in case of
manifolds without washers.
- reinsert the burner in the combustion chamber and tighten the screws fixing it
to the gas manifold
- place the cable grommet with the spark plug cable in its seat in the air distribu-
tion box
- restore connection of the spark plug cable
- refit the combustion chamber cover and the cover of the air distribution box
(OFF)