Preliminary Checks - Beretta MYNUTE BOILER GREEN 25 B.S.I. E Para El Instalador

ENGLISH
To install follow the instructions supplied with the kit.
In this configuration, the boiler is connected to the Ø 80 mm fumes
outlet duct by means of a Ø 60-80 mm adaptor.
In this case, the combustion supporting air is taken from the
room in which the boiler is installed, (which must be a suit-
able technical room with proper ventilation).
Non-insulated fumes outlet ducts are potential sources of
danger.
The fumes outlet duct must be inclined 1% towards the boiler.
The boiler automatically adapts ventilation according to the
type of installation and the length of the duct.
Max length fumes
outlet duct Ø 80 mm
25 B.S.I.
32 B.S.I.
CONCENTRIC OUTLETS (ø 60-100) (fig. 11b)
The concentric outlets can be placed in the most suitable direction
for the requirements of the installation, respecting the maximum
lengths shown in the table.
The fumes outlet duct must be inclined 1% towards the boiler.
Non-insulated fumes outlet ducts are potential sources of
danger.
The boiler automatically adapts ventilation according to the
type of installation and the length of the duct.
Do not obstruct or narrow the comburent air inlet duct in any way.
To install, follow the instructions supplied with the kits.
Rectilinear length means without bends, outlet ends and
connections
Max. linear length concentric
duct Ø 60-100 mm
25 B.S.I.
32 B.S.I.
Concentric ducts (Ø 80-125)
The relative adapter kit must be installed for this configuration.
Concentric ducts can be arranged in the most suitable direction for
installation requirements.
To install, follow the instructions provided with the specific kits for
condensation boilers.
Rectilinear length means without bends, outlet ends and
connections.
Max. linear length concentric
duct Ø 80-125 mm
25 B.S.I.
32 B.S.I.
Twin ducts (Ø 80 mm) (Fig. 11c)
The twin ducts can be aimed in the most suitable direction for in-
stallation needs.
To install, follow the instructions supplied with the specific kits for
condensation boilers.
The fumes outlet duct must be inclined 1% towards the boiler.
The boiler automatically adapts ventilation according to the
type of installation and the length of the ducts. Do not ob-
struct or narrow the ducts in any way.
The maximum lengths of individual pipes are shown in the
graphs (Fig. 12).
The use of longer ducts will reduce the power output of the boiler.
Rectilinear length means without bends, outlet ends and
connections.
8
Load losses for each
bend (m)
45°
60 m
1
57 m
Load losses for each
bend (m)
45°
7,85 m
1,3
7,85 m
Load losses for each
bend (m)
45°
14,85 m
1
14,85 m
Linear length twin
duct Ø 80 mm
25 B.S.I.
32 B.S.I.
4 - IGNITION AND OPERATION

4.1 Preliminary checks

First ignition is carried out by competent personnel from an autho-
rised Technical Assistance Service Beretta.
Before starting up the boiler, check:
a) that the supply networks data (electric, water, gas) corresponds
to the label data
b) that piping leaving the boiler is covered by thermal insulation
90°
sheath
c) that flue gas extraction and air suction pipes work correctly
1,5
d) that conditions for regular maintenance are guaranteed if the
boiler is placed inside or between furniture
e) the seal of the fuel adduction system
f) that fuel capacity corresponds to values requested by the boiler
g) that the fuel supply system has the correct capacity for the nec-
essary capacity to the boiler and that it has all the safety and
control devices prescribed by current regulations.
4.2 Appliance ignition
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 pararaph 4.3 - fault A09); the automatic purge cycle then
starts, lasting around 2 minutes.
During this phase the symbol
To interrupt the automatic purge cycle proceed as follows: access
the electronic board by removing the shell, turning the instrument
panel towards you and unscrew the two screws of the small cover
on the electronic board to have access to the terminals.
Then:
- using a small screwdriver included, press the CO button (fig. 9).
90°
Live electrical parts (230 Vac).
1,6
To start-up the boiler it is necessary to carry out the following op-
erations:
- power the boiler
- open the gas tap present in the system to allow fuel flow
- turn the mode selector (3 - fig. 1a) to the desired position:
Summer mode: turning the selector to the symbol summer
3a) the traditional function of only domestic hot water is activated.
If there is a domestic hot water request the digital display shows
the hot water system temperature, the icon to indicate the hot water
supply and the flame icon
Winter mode: by turning the mode selector within the area marked
+ and - (fig. 3b), the boiler provides domestic hot water and heat-
ing. If there is a heat request, the boiler switches on and the digital
90°
monitor indicates the heating water temperature, the icon to indi-
cate heating and the flame icon (fig. 4a). If there is a domestic hot
1,5
water request, the boiler switches on and the digital display shows
the hot water system temperature, the icon to indicate the hot water
supply and the flame icon (fig. 4b)
Adjustment of the heating water temperature
To adjust the heating water temperature, turn the knob with symbol
(fig. 3b) within the area marked + and -.
Depending on the type of system, it is possible to pre-select the
suitable temperature range:
- standard systems 40-80°C
- floor systems 20-45°C.
For further details, consult the "Boiler configuration" section.
Adjusting heating water temperature with an external probe
connected
When an external probe is connected, the value of the delivery
temperature is automatically chosen by the system which rapidly ad-
justs ambient temperature to the changes in external temperature.
To increase or decrease the temperature with respect to the value
Load losses for each
bend (m)
45°
36+36 m
1
35+35 m
is shown on the monitor.
90°
1,5
(fig.