Beretta MYNUTE GREEN 50 R.S.I. Manuel D'utilisation page 13

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 request is generated in this
phase with the ignition of the burner at minimum power, which is main-
tained until the water temperature reaches 55° C. During the anti-frost cy-
cle, the symbol (fig. 46) appears on the digital monitor.
Switching off for long periods
In case of absence for long periods of time, set the mode selector (fig. 42)
to (OFF).
Turn the main system switch OFF.
Close the fuel and water taps of the heating and domestic hot water sys-
tem. In this case, anti-frost device is deactivated: drain the systems, in case
of risk of frost.
4A LIGHT SIGNALS AND FAULTS
The control panel has three LEDs that indicate the boiler operating status:
GREEN LED
Flashing
Flashing (0.5 seconds on, then 3.5 seconds off) = boiler in standby, there
is no flame.
Flashing (0.5 seconds on, then 0.5 seconds off) = temporary shutdown of
the appliance due to the following automatic-reset faults:
- water pressure switch (standby time 10 minutes approximately)
- transitory waiting for ignition.
In this phase, the boiler waits for restoration of working conditions. If after
the standby time, the boiler does not restore regular operation, the shut-
down will be permanent and the signal light will be red.
Fast flashing (0.1 second on; then 0.1 second off; for 0.5 seconds) = Auto-
matic Temperature Control System input/output function (fig. 45).
Setting the heating water temperature selector in the zone marked by
AUTO (temperature value from 55 to 65°C) activates the Automatic Tem-
perature Control System: the boiler varies the output temperature accord-
ing to the closing signal of the room thermostat.
When the temperature set with the heating water temperature selector is
reached, a 20-minute countdown begins. If during this period the room
thermostat still requests heat, the value of the set temperature automati-
cally increases by 5°C.
When the new value is reached, other 20-minute countdown begins. If dur-
ing 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 tem-
perature selector and the increase of +10°C of the Automatic Temperature
Control System (S.A.R.A.) function.
After the second cycle, the temperature value is not increased any further
(set temperature +10°C) and cycle described above is repeated until the
room thermostat request is met.
Fixed green
There is flame, the boiler works regularly.
DESCRIPTION
Flame lockout/Water circulation failure (differential pressure
switch signal)
Limit thermostat intervention
Fan fault
Water pressure switch fault
Domestic hot water NTC probe fault
Fault on heating delivery NTC probe or delivery-return diffe-
rential circuit-breaker
Fault on heating return NTC probe or return-delivery differen-
tial circuit-breaker
Intervention of thermal safety device on flue gas probe
Flue gas NTC probe or heat exchanger cleaning
Intervention of low temperature thermostat - general alarm
Combustion analysis procedure in progress
RED LED
If the red LED lights up, this indicates the presence of a fault; the monitor
shows a code interpreted as follows:
To restore operation (deactivate alarms):
Faults A 01-02-03
Position the function selector to
the required position.
If the reset attempts do not reactivate the boiler, contact the Technical As-
sistance Centre.
Fault A04
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
the filling tap until the pressure reaches a value between 1 and 1.5 bar.
Then position the mode selector to the desired position.
The boiler will perform one purge cycle lasting approximately 2 minutes.
If pressure drops are frequent, request the intervention of the Technical
Assistance Service.
Fault A06
Contact the Technical Assistance Centre.
Fault A07
Contact the Technical Assistance Centre.
Fault A08
Contact the Technical Assistance Centre.
Fault A09 with fixed red LED lit
Position the function selector to
the required position.
If the reset attempts do not reactivate the boiler, request the intervention of
the Technical Assistance Service.
Fault A09 with flashing red and green LEDs
Contact the Technical Assistance Centre.
Fault A77
This is an automatic-reset fault, if the boiler does not restart, contact the
Technical Assistance Centre.
Flashing YELLOW LED
Combustion analysis in progress.
DISPLAY CODE RED LED
ON
A01
flashes
A02
ON
A03
ON
A04
flashes
A06
ON
A07
ON
A08
ON
A09
flashes
A09
ON
A77
OFF
ACO
(OFF), wait 5-6 seconds then set it to
(OFF) and adjust
(OFF), wait 5-6 seconds then set it to
YELLOW LED GREEN LED
OFF OFF
OFF OFF
OFF OFF
OFF ON
OFF flashes
OFF OFF
OFF OFF
OFF OFF
OFF flashes
OFF OFF
flashes OFF
.
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