Beretta Mynute Boiler 28/60 B.A.I. Installations- Und Bedienungsanleitung Seite 16

ENGLISH
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 room
thermostat (TA) to be carried out in the specific terminals.
To access the terminal board:
- turn off the system general switch
- undo the fixing screws of the shell (fig. 4)
- move forward and then upwards the shell base to unhook it from
the chassis
- turn the instrument panel upside down
- remove the terminal board cover (fig. 6)
- insert the cable of the possible T.A. (fig. 7).
The room thermostat must be connected as indicated on the wiring
diagram.
Room 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 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 mm², 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, condensation and mechanical stress and
vibration.
Non insulated outlet pipes are potential sources of danger.
The apertures for the combustion air must be realised in compli-
ance with applicable legislation. If condensation forms, the exhaust
duct must be insulated.
Figure 9 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 cor-
rectly exhausted which arrests the boiler in the event of a fault: flue
gas thermostat, fig. 8. To restore normal operation, turn the function
selector to (3 fig.1a), 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 re-
placement parts when replacing the whole system or faulty system
components.
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3.6 Filling the heating and DHW systems (fig. 10)
Turning off the storage boiler drain valve (E)
a) DHW system:
- open the cold water tap to fill up the water tank
- open the hot water to check the water tank filled up and wait until
b) Heating system:
- giving two or three turns to the cap of the automatic air vent valve
- making sure the cold water tap is open
- opening the filling tap (B) until the pressure measured by the
- close the filling tap after filling it up (B).
The boiler is equipped with an efficient air separator so that there is
no need to do anything manually.
3.7
- Switching off the boiler.
- Close the on-off taps of the heating and domestic hot water sys-
- Open the automatic air vent valves (A-C).
- Loosening the valve to empty boiler (D).
- Emptying out the bottom parts of the system.
3.8 DHW system emptying (fig. 10)
The hot water system must be emptied every time there is risk of
freezing by:
- turning off the tap at the mains
- unscrew the cap on the hose adapter
- connect a plastic hose to the hose adapter of the storage boiler
- open the valve drain device
- turning on all the hot and cold taps
- emptying out the bottom parts.
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
b) that piping leaving the boiler is covered by thermal insulation
c) that flue gas extraction and air suction pipes work correctly
d) that conditions for regular maintenance are guaranteed if the
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-
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 (3 - fig. 1a) to the desired position:
the water discharge.
(A) to open it
hydrometer is between 1 and 1,5 bar
heating
Empty the system
tem.
drain valve (E)
to the label data
sheath
boiler is placed inside or between furniture
essary capacity to the boiler and that it has all the safety and
control devices prescribed by current regulations.
Summer mode: turning the selector to the symbol summer
(fig. 2a) the traditional function of only domestic hot water is acti-
vated and the boiler supplies water at the temperature set on the
external storage tank. 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. 2b), the boiler provides domestic hot water
and heating. If there is a heat request, the boiler switches on
and the digital monitor indicates the heating water temperature,
the icon to indicate heating and the flame icon (fig. 3a). 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. 4a).
(fig. 10)