Electric Connection; Gas Connection - Beretta Mynute J 20 C.S.I. Manuel D'installation Et D'utilisation

ENGLISH
In case of replacement of Beretta boilers from previous type, there is an adaptation kit
of hydraulic connections available.

3.3 Electric connection

The boilers leave the factory completely wired with the power cable already connected
and they only need the connection of the ambient thermostat (AT) to be carried out in
the specific terminals (page 101).
To access the terminal board:
- turn off the system general switch
- undo the fixing screws (A) of the shell (fig. 6)
- move forward and then upwards the shell base to unhook it from the chassis
- undo the fixing screws (B) of the instrument panel (fig. 7)
- turn the instrument panel upside down
- remove the terminal board cover (fig. 8)
- insert the cable of the possible T.A. (fig. 9)
The ambient thermostat must be connected as indicated on the wiring diagram on
page 101.
Ambient thermostat input in safety low voltage (24 Vdc).
The connection to the mains supply must be carried out through a separation device
with an omnipolar opening of at least 3.5mm (EN 60335-1, category III).
The appliance operates with an alternating current of 230 Volt/50 Hz and an electrical
power of 100W per 20 C.S.I. - 115W per 24 C.S.I. - 128 per 28 C.S.I. E (and complies
with the standard EN 60335-1).
It is compulsory to carry out connection with an efficient earth circuit, according
to national and local legislation.
It is advisable to comply with neutral phase connection (L-N).
The earth wire must be a couple of centimetres longer than the others.
Do not use gas and/or water pipes to earth electrical appliance.
The manufacturer declines liability for any damage if the appliance was not connected
to an earth circuit.
Use the power cable supplied to connect the boiler to the mains power supply.
If the power cable is replaced, use a cable type HAR H05V2V2-F, 3 x 0.75 mm 2 ,
with max. outside diameter 7 mm.

3.4 Gas connection

Before connecting the appliance to the gas network, check that:
- national and local regulations are complied
- the gas type is the one suitable for the appliance
- the piping is clean.
The gas pipe must be installed outdoor. If the pipe goes through the wall, it must go
through the central opening, in the lower part of the template.
It is advisable to install a filter of suitable dimensions on the gas line if the distribution
network had solid particles.
Once the appliance has been installed check that connections are sealed according to
current installation regulations
3.5 Fumes exhaustion and air suction
For fumes exhaustion, refer to the current local and national regulations. Always com-
ply with local standards of the Fire Department, the Gas Company and with possible
municipal dispositions.
The release of combustion products is assured by a centrifugal fan placed inside the
combustion chamber and its correct operation is constantly checked by a pressure
switch. The boiler is supplied without the flue gas outlet/air suction kit, since it is pos-
sible to use the accessories for appliance with a forced draught sealed chamber that
better adapts to the installation characteristics.
It is essential for flue gas release and the restoration of boiler combustion air to use
certified pipes and that connection is carried out correctly as indicated by the instruc-
tions supplied with the flue gas accessories.
With only one smoke pipe you can connect more pieces of appliance provided that
every piece of appliance is sealed chamber type.
CONCENTRIC OUTLETS (ø 60-100)
The boiler has been designed to be connected to concentric outlet/suction pipes and with
the opening for air suction (M) closed (fig. 10). The concentric outlets can be places in the
most suitable direction according to room requirements, complying with the maximum
lengths indicated in the table.
For installation, follow the instructions supplied with the kit.
According to the length of the pipes used, it is necessary to insert a flange, selecting one
from those contained in the boiler (see the following table).
When necessary, the flue gas flange (L) must be removed using a screwdriver as a lever.
The table indicates the permitted linear lengths. According to the length of the pipes used,
it is necessary to insert a flange, selecting one from those contained in the boiler (see the
following table).
20 C.S.I.
Pipe length [m] Flue gas flange (L)
up to 0,85
from 0.85 to 2.35
from 2.35 to 4.25
4
Load losses for each
bend (m)
45°
Ø 39
1
Ø 41 (**)
Ø 43
24 C.S.I.
Pipe length [m]
up to 0.85
from 0.85 to 2.35
from 2.35 to 4.25
(**) fitted in boiler
28 C.S.I. E
Pipe length [m]
up to 0,85
from 0.85 to 1.70
from 1.70 to 2.70
from 2.70 to 3.40
Concentric pipes (ø 80/125)
The boiler has been designed to be connected to concentric outlet/suction
pipes and with the opening for air suction closed.
The concentric outlets can be placed in the most suitable direction according to
room requirements, complying with the maximum lengths indicated in the table.
For installation, follow the instructions supplied with the kit.
To go through the wall, drill a hole of Ø 140 mm.
20 C.S.I.
Pipe length
Ø 80 125 [m]
from 0.96 to 3.85
from 3.85 to 7.85
from 7.85 to 12.40
24 C.S.I.
Pipe length
Ø 80 125 [m]
from 0.85 to 3.85
from 3.85 to 7.85
from 7.85 to 12.4
28 C.S.I. E
Pipe length
Ø 80 125 [m]
from 0.96 to 2.90
from 2.90 to 5.20
from 5.20 to 7.10
from 7.10 to 10
According to the length of the pipes used, it is necessary to insert a flange selecting
from those contained in the boiler (see table).
Pay special attention to external temperature and pipe length. Refer to the diagrams in
order to establish if it is compulsory or not to use a condensation collector.
In case of operation at temperature lower than 60 °C, it is compulsory to use a conden-
sation collector. If a condensation collector is used, provide a slope of the flue exhaust
pipe of 1% towards the collector.
Connect the condensation trap syphon to a white water outlet pipe.
Non insulated outlet pipes are potential sources of danger.
MAXIMUM LENGTH OF CONCENTRIC PIPES
COMPULSORY
CONDENSATE BASIN
14,0
13,5
13,0
12,5
12,0
11,5
COMPULSORY
11,0
CONDENSATE
10,5
CONDENSATE
10,0
COLLECTOR
9,5
BASIN
9,0
COMPULSORY
8,5
8,0
7,5
7,0
6,5
6,0
5,5
5,0
4,5
4,0
3,5
90° 3,0
2,5
2,0
1,5
1.5
1,0
0,5
0,0
-30 -25 -20 -15
OUTSIDE TEMPERATURE (°C)
EXTERNAL TEMPERATURE (°C)
Load losses for each
Flue gas flange (L)
Ø 42
Ø 44 (**)
not installed
Load losses for each
Flue gas flange (L)
Ø 43
Ø 45
Ø 47
not installed
Load losses for each
Flue gas
bend (m)
flange (L)
45°
Ø 39
Ø 41
1.35
Ø 43
Load losses for each
Flue gas
bend (m)
flange (L)
45°
Ø 42
Ø 44
1.35
not installed
Load losses for each
Flue gas
bend (m)
flange (L)
45°
Ø 43
Ø 45
1.35
Ø 47
not installed
Ø 80/125
NON-COMPULSORY
CONDENSATE BASIN
OUTSIDE TEMPERATURE (°C)
28kW
NON-COMPULSORY
CONDENSATE COLLECTOR
CONDENSATE BASIN
NOT COMPULSORY
-10 -5 0 5 10 15 20 25
bend (m)
45° 90°
1 1.5
bend (m)
45° 90°
1 1.5
90°
2.2
90°
2.2
90°
2.2
Mynute J 20-24 C.S.I.
Mynute J 28 C.S.I. E
30