Beretta MYNUTE GREEN 50 R.S.I. Manuel D'utilisation page 7

4 - SWITCHING ON AND OPERATION
4.1 Switching on the appliance
Every time the appliance is powered up, a series of data is shown on the
display including the flue gas sensor meter reading (-C- XX) (see para-
graph 4.3 - fault A09); the automatic purge cycle then starts, lasting around
2 minutes. During this phase, the three LEDs light up alternately and the
symbol is shown on the monitor (fig. 36).
To interrupt the automatic purge cycle proceed as follows:
access the electronic board by removing the housing, turning the instru-
ment panel towards you and opening the board casing.
Then:
- press the CO button (fig. 37).
Live electrical parts (230 V AC).
To start up the boiler it is necessary to carry out the following operations:
- power the boiler
- open the gas tap to allow the flow of fuel
- set the room thermostat to the required temperature (~20°C)
- turn the mode selector to the desired position:
Winter mode: turning the function selector (fig. 38) within the area marked
+ and -, the boiler supplies hot water for heating and, if connected to an
external storage tank - supplies hot water for DHW.
If there is a heat request, the boiler switches on and the boiler status indi-
cator LED lights up with a fixed green light. The display the delivery tem-
perature (fig. 40).
If there is a domestic hot water request, the boiler switches on and the
boiler status indicator LED lights up with a fixed green light.
The display indicates the domestic hot water temperature (fig. 41).
Adjustment of the heating water temperature
To adjust the heating water temperature, turn the knob with symbol
(fig. 38) clockwise to increase water temperature and anti-clockwise to
lower it.
Depending on the type of system, the most suitable temperature range can
be pre-selected:
- standard installations 40-80°C
- floor installations 20-45°C.
For the details, refer to paragraph "Boiler configuration".
Adjustment of heating water temperature with an external probe con-
nected
When an external probe is installed, the delivery temperature is automati-
cally selected by the system, which quickly adjusts the ambient temperatu-
re according to variations in the outside temperature.
If you want to alter the temperature value (increasing or reducing the va-
lue automatically calculated by the electronic card), use the heating water
temperature selector: turn it clockwise to increase the temperature, or an-
ticlockwise to reduce it.
The correction possibility is between -5 and +5 levels of comfort, shown on
the digital display by rotating the knob.
Summer mode only active when the external storage tank is connected:
turning the selector to the summer mode symbol
traditional domestic hot water only function, the boiler supplies water at
the temperature set on the external storage tank.
If there is a domestic hot water request, the boiler switches on and the
boiler status indicator LED lights up with a fixed green light. The display
indicates the delivery temperature (fig. 41).
Adjustment of the domestic hot water temperature
CASE A heating only - adjustment does not apply.
CASE B heating only + external storage tank with thermostat - adjustment
does not apply.
CASE C heating only + external storage tank with probe - to adjust the tem-
perature of the domestic hot water in the storage tank, turn the knob with
the symbol clockwise to increase water temperature and anti-clockwise
to lower it.
On the control panel, the green LED flashes with ON for 0.5 seconds, OFF
for 3.5 seconds.
The boiler is standby status until, after a heat request, the burner switches
on and the indicator LED turns fixed green to indicate flame presence.
The boiler continues to operate until the temperatures set on the boiler are
reached, or the heat request is met; after which it goes back on standby.
If the red LED indicator near the
lights up, this means the boiler is in temporary shutdown status (see the
chapter "Light signals and faults").
The digital monitor indicates the fault code detected.
S.A.R.A. function fig. 45
Setting the heating water temperature selector in the zone marked by
AUTO, activates the automatic temperature control system (green led
flashing): according to the temperature set on the room thermostat and
the time taken to reach it, the boiler varies automatically the heating water
temperature reducing the operating time, allowing greater ease of opera-
tion and energy saving. On the control panel, the green LED flashes ON for
0.5 seconds, OFF for 3.5 seconds.
(fig. 39) activates the
symbol (fig. 44) on the control panel
Reset function
To restore operation, set the mode selector to
then set the mode selector to the required position, checking that the red
indicator light is OFF.
At this point the boiler will automatically start and the red lamp switches
on in green.
N.B. If the attempt to reset the appliance does not activate operation, con-
tact the Technical Assistance Service.
4.2 Switching off
Temporary switch-off
In case of absence for short periods of time, set the mode selector (fig.
42) 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 mini-
mum output levels to bring the water temperature back to the values for
safety (35°C). During the anti-frost cycle, the symbol
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 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.
4.3 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 count-
down 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-minute countdown begins. If during this
period the room thermostat still requests heat, the value of the set tem-
perature 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 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.
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:
(fig. 42), wait 5-6 seconds
(fig. 46) appears
(OFF), wait 5-6 seconds then set it to
.
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