Beretta Mynute S 24 C.A.I. E Manuel D'installation Et D'utilisation page 6

ENGLISH
Environment Automatic
(S.A.R.A.) fig. 7a
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 room
thermostat. When the temperature set with the heating water tem-
perature selector is reached, a 20 minutes count begins. If during
this period the room 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 room 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 in-
crease of +10 °C of the S.A.R.A function. After the second cycle the
temperature value should be kept at the set value +10°C until the
request of the room thermostat is satisfied.
4.3 Switching off
Temporary switching off
In case of absence for short periods of time, set the mode selector
(3 - fig. 1a) to (OFF).
In this way (leaving the electricity and fuel supplies enabled), the
boiler is protected by the following systems:
- Anti-frost device: when the temperature of the water in the boiler
falls below 5°C, the circulator and, if necessary, the burner are
activated at minimum output levels to bring the water tempera-
ture back to the values for safety (35°C). During the anti-frost
cycle, the symbol appears on the digital monitor.
- Circulator anti-blocking function: an operation cycle is activated
every 24 hours.
- DHW Antifreeze (only when connected to an external storage
tank with probe): the function is activated if the temperature
measured by the storage tank probe drops below 5° C. A heat re-
quest is generated in this phase with the ignition of the burner at
minimum power, which is maintained until the water temperature
reaches 55° C. During the anti-frost cycle, the symbol
on the digital monitor.
Long period switching off
In case of absence for long periods of time, set the mode selector
(3 - 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 (fig. 6a)
The operating status of the boiler is shown on the digital display,
below is a list of the types of displays.
To restore operation (deactivate alarms):
Faults A 01-02-03
Position the function selector to
set it to the required position
mode). If the reset attempts do not reactivate the boiler, contact the
Technical Assistance Centre.
Fault A 04
In addition to the fault code, the digital display shows the symbol
.
Check the pressure value indicated by the water gauge:
if it is less than 0.3 bar, position the function selector to
and adjust the filling tap (L fig. 12) until the pressure reaches a
value between 1 and 1.5 bar.
Then position the mode selector to the desired position
mer) or (winter).
If pressure drops are frequent, request the intervention of the Tech-
nical Assistance Service.
Fault A 06
The boiler operates normally but cannot reliably maintain a con-
stant domestic hot water temperature, which remains set at around
50°C. Contact the Technical Assistance Centre.
Fault A 07
Contact the Technical Assistance Centre.
6
Adjustment System Function
(OFF), wait 5-6 seconds then
(summer mode) or
BOILER STATUS
Stand-by
OFF status
ACF module lockout alarm
ACF electrical fault alarm
Limit thermostat alarm
Fumes thermostat
H2O pressure switch alarm
NTC domestic water fault
NTC heating fault
Parasite flame
Electric calibration min and max heating
Transient awaiting ignition
Fumes thermostat intervention
H2O pressure switch intervention
Preheating Function active
Preheating heat request
External probe present
Domestic water heat request
Heating heat request
Anti-freeze heat request
Flame present
4.5 Adjustments
appears
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 conver-
sion, 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. 6)
- unscrew by two turns the screw of the pressure test point down-
stream the gas valve and connecting the pressure gauge
4.5.1 Maximum power and minimum domestic hot
water adjustment
- 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
(winter
(fig. 8a)
- power the boiler setting the system main switch to "on"
- check that the pressure on the pressure gauge is stable; or with
a milliammeter 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,
(OFF)
using a screwdriver (fig. 14)
- with a fork spanner CH10 use the adjustment nut of the maxi-
mum output in order to obtain the value indicated in table "Tech-
(sum-
nical data"
- disconnect the modulator faston
- wait until the pressure on the pressure gauge is stable at mini-
mum 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 "Technical data"
- reconnect the modulator faston
- close the domestic hot water tap
- carefully refit the protection cap of the adjustment screws.
DISPLAY
-
OFF
A01
A01
A02
A03
A04
A06
A07
A11
ADJ
88°C flashing
flashing
flashing
flashing
60°C
80°C
(summer) (fig. 2a)