Ignition And Operation - Beretta Junior 24 C.A.I. Manuel D'installation Et D'utilisation

ENGLISH
3.2 Securing the boiler to the wall and hydraulic connections
To fasten the boiler to the wall, use the cardboard template (fig. 4-5) in the
packaging. The position and size of the hydraulic connections are indicated
below:
A CH return
B CH delivery
C gas connection
D DHW output
E DHW input
In case of replacement of Beretta boilers from previous type, there is an ad-
aptation 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 omnipolar opening of at least 3.5 mm (EN 60335-1, category III).
The appliance operates with an alternating current of 230 Volt/50 Hz and an
electrical power of 100 W (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
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
Observe applicable legislation regarding flue gas exhaustion. The exhaust
system must be made using rigid ducting, the joints between elements must
be hermetically sealed and all components must be resistant to heat, con-
densation and mechanical stress and vibration. Non insulated outlet pipes
are potential sources of danger. The apertures for the combustion air must
be realised in compliance with applicable legislation (fig. 2). If condensation
forms, the exhaust duct must be insulated.
Figure 13 shows a top-down view of the boiler with the dimensions for the
flue gas exhaust outlet.
Flue gas safety system
The boiler features a system monitoring that flue gases are correctly exhausted
which arrests the boiler in the event of a fault: flue gas thermostat, fig. 11-12.
To restore normal operation, turn the function selector to " " (fig. 10), wait a
few seconds, then turn the function selector into the desired position. If the fault
persists, call a qualified technical from the Technical Support Service. The flue
gas exhaustion monitoring system must never be bypassed or rendered
inoperable. Use only original replacement parts when replacing the whole
system or faulty system components.
4
3/4"
3/4"
3/4"
1/2"
1/2"
3.6 Filling the heating system (fig. 14)
Once the hydraulic connections have been carried out, fill the heating sys-
tem.
This operation must be carried out with cold system following this instruc-
tions:
- turn by two or three turns the automatic relief valve cap (A)
- make sure the cold water inlet tap is open
- open the filling tap (B) until the pressure indicated by the water pressure
gauge is within 1 and 1.5 bar.
Once filling is complete, close the filling tap.
The boiler has an efficient air separator so no manual intervention is
needed.
The burner switches on only if the air relief phase is finished.
3.7 Emptying the heating system
To empty the system, proceed as follow:
- switch off the boiler
- loose the boiler outlet tap (C)
- empty the lowest points of the system.
3.8 Emptying the domestic hot water
When 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 pos-
sible damages due to safety valve operation.

4 IGNITION AND OPERATION

4.1 Preliminary checks
First ignition is carried out by competent personnel from an authorised
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
2
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) check that the gas valve is calibrated correctly and, if necessary, adjust
as described in the paragraph "Adjustments"
h) that the gas supply system is of the correct capacity for the boiler and
is equipped with all the safety and monitoring devices prescribed by ap-
plicable legislation.
4.2 Appliance ignition (fig. 1a - 2a - 2b - 3a - 4a - 5a)
To start-up the boiler it is necessary to carry out the following operations:
- power the boiler
- open the gas tap present in the system to allow fuel flow
- turn the mode selector (2 - fig. 1a) to the desired position:
summer mode: turning the selector to the symbol summer "
the traditional function of only domestic hot water is activated.
winter mode: turning the mode selector to the area divided in segments
(fig. 2b) the boiler provides hot water and heating.
- adjust ambient thermostat to desired temperature (~20°C)
Adjustment of the heating water temperature
To adjust the heating water temperature, turn the knob with symbol "
3a) to the area divided in segments.
Adjustment of domestic hot water temperature
To adjust domestic hot water temperature (bathrooms, showers, kitchen, etc.),
turn the knob with symbol "
1 (min value 37 °C) and 9 (max. value 60 °C).
On the control panel, the green led (1 - fig. 1a) flashes with frequency 0.5
second on, 3.5 seconds off.
The boiler is standby status until, after a heat request, the burner switches on
and the indicator turns fixed green to indicate flame presence.
The boiler will be in function until the adjusted temperature is reached, after-
wards it will be in "stand-by" again.
If faults arise in ignition or operations, the boiler performs a "SAFETY STOP":
on the control panel, the green indicator will switch off and the boiler lockout
red indicator will switch on (see chapter light signals and faults).
" (fig. 4a): to one of the numerical values within
" (fig. 2a)
" (fig.