Beretta Mynute Green 50 R.S.I. Manuel D'utilisation Et D'installation page 8

MYNUTE GREEN 50 R.S.I.
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
indicator LED lights up with a fixed green light. The display the delivery
temperature (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
connected
When an external probe is installed, the delivery temperature is
automatically selected by the system, which quickly adjusts the ambient
temperature according to variations in the outside temperature.
If you want to alter the temperature value (increasing or reducing the value
automatically calculated by the electronic card), use the heating water
temperature selector: turn it clockwise to increase the temperature, or
anticlockwise 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
temperature 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.
8
(fig. 39) activates the
symbol (fig. 44) on the control panel
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.
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,
contact 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
minimum 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 maintained
until the water temperature reaches 55° C. During the anti-frost cycle, 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 system.
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
shutdown 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) =
Automatic 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 Temperature
Control System: the boiler varies the output temperature according 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 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 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 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.
(fig. 42), wait 5-6 seconds
(fig. 46) appears