Beretta Mynute J 20 C.S.I. Manuel D'installation Et D'utilisation page 6

ENGLISH
4.3 Switching off
Temporary switching off
In case of absence for short periods of time, set the mode selector (2 - fig.
1a) to " (OFF).
"
Anti-frost device remains active.
Long period switching off
In case of absence for long periods of time, set the mode selector (2 - fig.
1a) to " (OFF).
"
Then, close the gas tap present on the system. In this case, anti-frost device
is deactivated: empty the systems, in case of risk of frost.
4.4 Light signals and faults
The control panel has two led that indicate the boiler operating status:
Green led
Flashing
- Flashing with frequency 0.5 second on - 3.5 seconds off = boiler in standby,
there is no flame.
- Flashing with frequency 0.5 second on - 0.5 second off = temporary stop
of the appliance due to the following self-restoring faults:
- water pressure switch (standby time 10 minutes approximately)
- differential air pressure switch (standby time 10 minutes approximately)
- transitory waiting for ignition.
In this phase, the boiler waits for restoration of working conditions. If after
standby time, the boiler will not restore regular operation, stop will be per-
manent and light signalling will be red.
- Fast flashing (frequency 0.1 sec. on; 0.1 sec. off; duration 0.5) S.A.R.A.
input/output function (Italian acronym for Environment Automatic Adjust-
ment System) - Fig. 10a.
By setting the heating water temperature selector to the area marked by
AUTO - temperature value from 55 to 65°C - the S.A.R.A. self-adjusting
system is activated: the boiler varies the delivery temperature according
to the closing signal of the ambient thermostat. When the temperature
set with the heating water temperature selector is reached, a 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.
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 06 domestic hot water NTC probe (blinking green + red LEDs)
A 07 heating NTC probe (fixed red LED)
To restore operation: faults A 01-02-03
Position the function selector on "
the required position (summer) "
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-thermohydrometer: if it is less
than 0.3 bar, position the function selector on
until the pressure reaches a value between 1 and 1.5 bar. Position the function
selector on the required position (summer) "
pressure drops occur frequently, contact the Technical Assistance Centre.
Fault A 06
The boiler functions normally but does not guarantee a constant domestic
hot water temperature, which remains set at around 50°C.
Fault A 07
Contact the Technical Assistance Centre.
Fixed yellow LED
Pre-heating function activated.
When the LEDs flash alternatively it means that there is a calibration pro-
cedure in progress.
4.5 Adjustments
The boiler has already been adjusted by the manufacturer.
If it is necessary to adjust it again, for example after extraordinary mainte-
nance, 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.
6
")
" OFF, wait 5-6 seconds then rotate it to
" or " " (winter). If the reset attempts
" symbol. Check
OFF and adjust the filling tap
" or " " (winter). If these
- 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 power and minimum domestic hot water ad-
justment
- Fully open the hot water tap
- on the control panel:
- set the mode selector to
- turn the domestic hot water temperature selector to its maximum (fig. 17)
- power the boiler setting the system main switch to "on"
- check that the pressure on the pressure gauge is stable; or with a milliam-
meter in series to the modulator, make sure that the modulator supplies
the maximum available current (120 mA for G20 and 165 mA for LPG).
- carefully prise out the protection cap of the adjustment screws, using a
screwdriver (fig.17a)
- with a fork spanner CH10 use the adjustment nut of the maximum output
in order to obtain the value indicated in table on page 9.
- disconnect the modulator faston
- wait until the pressure on the pressure gauge is stable at minimum value
- paying attention not to press the internal shaft, use an Allen spanner to turn
the red adjustment screw for domestic hot water minimum temperature
regulation, calibrating it until the pressure gauge reads the value indicated
in the table on page 9.
- reconnect the modulator faston
- close the domestic hot water tap
- 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 exclu-
sively 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 selec-
tor in winter position, independently from the possible presence of other
operation request.
-
by inserting the jumper JP1, with the mode selector in winter position,
without heat request in progress.
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 B (fig. 19) until it reaches
the minimum heating value as indicated in the multigas table on page 9
- insert the jumper JP2 (fig. 18)
- turn the domestic hot water temperature adjustment knob C (fig. 19) until
it reaches the maximum heating value as indicated in the multigas table
on page 9
- remove the jumper JP2 to store the maximum heating 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 mini-
mum 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
from the boiler.
(summer) (fig. 16)
(OFF)
(OFF) or removing the voltage