Beretta Mynute S 24 C.A .I. E Instrucciones De Instalacion Y Uso página 6

ENGLISH
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.
3.5 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.
3.6 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
compliance with applicable legislation. If condensation forms, the
exhaust duct must be insulated. Figure 11 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. 10. 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
replacement parts when replacing the whole system or faulty
system components.
3.7 Filling the heating system (fig. 12)
Once the hydraulic connections have been carried out, fill the
heating system. This operation must be carried out with cold
system following this instructions:
- turn by two or three turns the automatic relief valve cap (I)
- make sure the cold water inlet tap is open
- turn on the filling tap (L - fig. 12) until the pressure indicated by
the water pressure gauge is between 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.
3.8 Emptying the heating system
To empty the system, proceed as follow:
- switch off the boiler
- loose the boiler outlet tap (M)
- empty the lowest points of the system.
3.9 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 (N), it must be
connected to a suitable collection system. The manufacturer is not
responsible for possible damages due to safety valve operation.
6
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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
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
4.2 Appliance ignition
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 (3 fig. 1a) to the desired position:
- Adjust the room thermostat to the required temperature (~20°C)
Adjustment of the heating water temperature
To adjust the heating water temperature, turn the knob with symbol
Adjustment of domestic hot water temperature
To adjust domestic water temperature (bathrooms, showers,
kitchen, etc.), turn the knob with symbol
marked + and -.
The boiler is standby status until, after a heat request, the burner
switches on and the digital display shows the hot water system
temperature, the icon to indicate the hot water supply and the flame
icon.
The boiler will be in function until the adjusted temperature is
reached, afterwards it will be in "standby" again.
to the label data
sheath
boiler is placed inside or between furniture
necessary 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 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. 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)
Pre-heating (faster hot water): rotate the domestic hot water
temperature adjustment knob (4 - fig. 1a) to the
5a), to activate 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 domestic hot water, according to the current
request. During burner ignition following a pre-heating request,
the monitor indicates the
To deactivate the pre-heating function, rotate the domestic
hot water temperature
symbol. Bring the domestic hot water temperature adjustment
knob back to the required position. This function cannot be
activated when the boiler is OFF: function selector (3 fig.1a) on
OFF.
(fig. 3b) within the area marked + and -.
symbol (fig.
symbol (fig. 5b).
adjustment knob back
(fig. 2b) within the area
to the