Beretta MYNUTE BOILER GREEN B.S.I. E Manuel D'utilisation Et D'installation page 13

- 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
temperature back to the values for safety (35°C). During the anti-
frost cycle, the symbol
- Circulator anti-blocking function: an operation cycle is
activated every 24 hours.
Long period switching off
In case of absence for long periods of time, set the mode selector
(3 - fig. 1a) to (OFF) (fig. 2a).
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.
4A CONTROLS
At the beginning of the heating season, and occasionally during
use, make sure the hydrometer-thermohydrometer indicates cold
system pressure values between 0.6 and 1.5 bar: this avoids
system noise levels due to the presence of air. In case of insufficient
water circulation, the boiler will switch off. Under no circumstances,
water pressure must be below 0.5 bar (red field).
If this condition is checked, it is necessary to restore water pressure
in the boiler proceeding as follows:
- set the mode selector (3 - fig.1a) to
- turn on the filling tap (I - fig. 14) until the pressure value is
between 1 and 1.5 bar.
Carefully close the tap. Replace the mode selector on the initial
position. If pressure drop is frequent, contact the Technical
Assistance Service.
5A LIGHT SIGNALS AND FAULTS
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 (I - fig. 14) until the pressure reaches a
value between 1 and 1.5 bar.
Then position the mode selector to the desired position
(summer) or (winter).
If pressure drops are frequent, request the intervention of the
Technical Assistance Service.
Fault A 06
The boiler operates normally but cannot reliably maintain a
constant domestic hot water temperature, which remains set at
around 50°C. Contact the Technical Assistance Centre.
Fault A 07
Contact the Technical Assistance Centre.
Fault A 08
Contact the Technical Assistance Centre.
Fault A 09
Position the function selector to
set it to the required position
mode). If the reset attempts do not reactivate the boiler, request the
intervention of the Technical Assistance Service.
Fault A 09
The boiler is equipped with an auto-diagnostic system which,
based on the total number of hours in certain operating conditions,
can signal the need to clean the primary exchanger (alarm code 09
and flue gas meter >2,500).
Once the cleaning operation has been completed, using the special
kit supplied as an accessory, the total hour meter will need to be
reset to zero 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
appears on the digital monitor.
(OFF)
(OFF), wait 5-6 seconds then
(summer mode) or
(OFF), wait 5-6 seconds then
(summer mode) or
- while the boiler is powered up, using a small screwdriver included,
press the CO button (fig. 9a) for at least 4 seconds, to check the
meter has been reset, power down then power up the boiler; the
meter reading is shown on the monitor after the "-C-" sign.
Live electrical parts (230 Vac).
Note: the meter resetting procedure should be carried out after
each indepth cleaning of the primary exchanger or if this latter is
replaced. To check the status of the total hour meter, multiply the
reading by 100 (e.g. reading of 18 = 1,800 total hours; reading of 1
= 100 total hours).
The boiler continues to operate normally even when the alarm is
activated.
BOILER STATUS
Stand-by
OFF status
ACF module lockout alarm
ACF electrical fault alarm
Limit thermostat alarm
Air pressure switch alarm
H O pressure switch alarm
2
NTC domestic water fault
Primary (flow) thermistor fault - Primary (flow) thermi-
stor over temperature - Temperature differential
Return thermistor fault - Return thermistor overtem-
perature - Temperature differential inverted
Flue thermistor or flue thermistor counter fault -
Flue thermistor over temperature
False flame
Low temperature thermostat fault
(winter Calibration
Service operation
Transient awaiting ignition
.
H O pressure switch intervention
2
Purge cycle mode active
(OFF)
External probe present
Domestic water heat request
Heating heat request
Anti-freeze heat request
Flame present
(winter
Mynute Boiler Green B.S.I. E
DISPLAY
-
OFF
A01
A01
A02
A03
A04
A06
A07
A08
A09
A11
A77
ADJ
ACO
88
°C flashing
flashing
60
°C
80
°C
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