Preliminary Checks - Beretta Mynute LOW NOx 24 C.S.I. Installer And User Manual

the flue gas flange (F) 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, select-
ing one from those contained in the boiler (see the following table).
Pipe length
ø 60-100 [m]
up to 1
from 1 to 2,5 not installed
TWIN OUTLETS (ø 80) (fig. 17)
Twin outlets can be placed in the most suitable direction according
to the room requirements.
The air inlet adaptor must be correctly oriented, it is therefore
necessary to fix it using the appropriate screws, so that the
locating tab does not interfere with the casing.
When necessary, the flue gas flange (F) 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).
Pipe length
ø 80 [m]
up to 8+8
from 8+8 to 14+14
Refer to the graphic - fig. 18 to calculate the maximun lenghts of
sigle pipe ø 80.
B22P/B52P Suction indoors and discharge outdoors
C12-C12x Discharge via concentric wall outlet. The pipes may leave the
boiler independently, but the outlets must be concentric or sufficiently
close together to be subjected to similar wind conditions (within 50 cm)
C32-C32x Discharge via concentric roof outlet. Outlets as for C12
C42-C42x Discharge and suction in common separate smoke pipes, but
subjected to similar wind conditions
C62-C62x Discharge and suction lines using pipes marketed and certified
separately (1856/1)
C82-C82x Discharge via single or common smoke pipe and wall suction line
C92-C92x Discharge on roof (similar to C32) and air suction from a sin-
gle existing smoke pipe
C32
C32
C82
C12
24 C.S.I.
Load losses for each
Flue gas
bend (m)
flange (F)
45°
Ø 48
1,0
24 C.S.I.
Load losses for each
Flue gas
bend (m)
flange (F)
45°
Ø 48
1,2
not installed
C92
B22
C42
C42
C12
3.5 Filling the heating system (fig. 20)
Once the hydraulic connections have been carried out, fill the heat-
ing system. This operation must be carried out with cold system
following this instructions:
- turn by two or three turns the automatic relief valve cap (A fig. 20)
- make sure the cold water inlet tap is open
- turn on the filling tap (B fig. 20) until the pressure indicated by the
water pressure gauge is between 1 and 1.5 bar.
Once filling is complete, close the filling tap.
90°
The boiler has an efficient air separator so no manual intervention
is needed. The burner switches on only if the air relief phase is
1,5
finished.
3.7 Emptying the heating system
To empty the system, proceed as follow:
- switch off the boiler
- loose the boiler outlet tap (C fig. 20)
- empty the lowest points of the system.
3.8 Emptying the domestic hot waterWhen there is risk of frost,
the domestic hot water system must be emptied in the following
way:
- close the main tap of the water mains
- open all the hot and cold water taps
- empty the lowest points.
WARNING
When carrying out the discharge of the safety valve (D), it must be
connected to a suitable collection system. The manufacturer is not
responsible for possible damages due to safety valve operation.
4 - IGNITION AND OPERATION
90°

4.1 Preliminary checks

1,7
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
sheath
c) that flue gas extraction and air suction pipes work correctly
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
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 (1 - fig. 1a) to the desired position:
Summer mode: turning the selector to the symbol summer
2a) 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.3a), the boiler provides domestic hot water and heat-
ing. If there is a heat request, the boiler switches on and the digital
monitor indicates the heating water temperature, the icon to indi-
cate heating and the flame icon (fig. 4a). If there is a domestic hot
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. 5a)
Pre-heating (faster hot water): rotate the domestic hot water tem-
perature adjustment knob to the
pre-heating function. This function keeps the water in the domestic
hot water exchanger hot, to reduce standby times when a request
is made. When the pre-heating function is enabled, the monitor
indicates the delivery temperature of the heating water or the do-
Mynute LOW NOx C.S.I.
(fig.
symbol (fig. 6a), to activate the
5