Installation Regulations; Important; Securing The Boiler To The Wall And Hydraulic Connections; Electric Connection - Beretta Mynute S 24 C.S.I. Instrucciones De Instalacion Y Uso

ENGLISH
C82x, C92x.
In configuration B22P and B52P (when installed indoors), the ap-
pliance cannot be installed in bedrooms, bathrooms, showers or
where there are open fireplaces without a proper air flow. The room
where the boiler is installed must have proper ventilation.
In configuration C, the appliance can be installed in any type of
room and there are no limitations due to ventilation conditions or
room volume.
Mynute S R.S.I. is a Type C wall-mounted boiler that can function
in various mode:
MODE A
Heating only without any external storage tank connected.
The boiler does not supply domestic hot water.
MODE B
Heating only with a thermostatically controlled external storage
tank connected: in this condition, with every heat request from the
storage tank thermostat, the boiler supplies hot water for the prepa-
ration of the domestic hot water.
MODE C
Heating only, with the connection of an external storage tank (ac-
cessory kit available upon request) (managed by a temperature
probe) for preparing domestic hot water. When connecting the stor-
age tank not supplied by us, make sure that the NTC probe has the
following characteristics: 10 kOhm at 25°C, B 3435 ±1%

3 - INSTALLATION REGULATIONS

3.1 Installation regulations
Installation must be carried out by qualified personnel.
Always comply with national and local regulations.
POSITION
Mynute S C.A.I. E: class B appliances cannot be installed in bed-
rooms, bathrooms or showers, or in rooms with open flues without
adequate ventilation. It is imperative that the room in which a gas
appliance is installed has a sufficient inflow of air to supply the
quantity of air necessary for normal combustion and ensure proper
ventilation of the room itself. Natural direct ventilation with external
air must be provided for via
- permanent openings in the walls of the room in which the ap-
pliance is installed leading outdoors. These openings must be
made in such a way as to ensure that the orifices on both the
internal and external side of the wall cannot be obstructed or be
reduced in effective diameter, the orifices themselves must be
protected with metal grilles or similar means and must be situ-
ated near floor level and in a location that does not interfere with
the function of the flue exhaust system (where this position is
not possible, the diameter of the ventilation openings must be
increased by at least 50%),
- while single or multiple branched the ventilation ducts may be
used.
The ventilation air must be sourced directly from outside the build-
ing, away from sources of pollution. Indirect ventilation, with air
drawn from rooms next to the room in which the appliance is in-
stalled, is permitted, provided that the limitations indicated by cur-
rent local regulations. The room in which the boiler is to be installed
must be adequately ventilated in compliance with applicable leg-
islation. Detailed prescriptions for the installation of the flue, gas
piping and ventilation ducting are given in current local regulations.
The aforementioned regulations also prohibit the installation of
electric fans and extractors in the room in which the appliance is
installed. The boiler must have a fixed outward leading exhaust
duct with a diameter not smaller than the exhaust hood collar. Be-
fore fitting the exhaust outlet connector to the flue, check that the
flue has adequate draught and has no restrictions and that the ex-
hausts of no other appliances are connected to the same flue pipe.
When connecting to a pre-existing flue pipe, check that the latter
is perfectly clean, as deposits may detach from the wall of the pipe
during use and obstruct the passage of the flue gases, creating a
situation of severe danger for the user.
Mynute S can be installed indoors (fig. 2).
The boiler has protection that guarantees correct operation with a
temperature range from 0°C to 60°C.
To take advantage of protections, the appliance must be able to
4
start up, since any lockout condition (for example, absence of gas
or electrical supply, or safety intervention) deactivates the protec-
tions.
MINIMUM DISTANCES
In order to have access to the boiler to perform regular mainte-
nance operations, respect the minimum spaces foreseen for instal-
lation (fig. 3).
For correct appliance positioning:
- do not place it on a cooker or other cooking device
- do not leave inflammable products in the room where the boiler
is installed
- heat sensitive walls (for example, wooden walls) must be pro-
tected with proper insulation.

IMPORTANT

Before installation, wash every system piping carefully in order to
remove any residues that may impair the operation of the appli-
ance.
Under the safety valve, install a water collecting funnel with the
corresponding discharge in the event of leaks due to the overpres-
sure of the heating system. The domestic hot water circuit does
not need a safety valve, but make sure that the pressure of water-
works does not exceed 6 bar. In case of doubts, install a pressure
reducer.
Prior to ignition, make sure that the boiler is designed to operate
with the gas available; this can be checked by the message on the
packaging and the adhesive label indicating the gas type.
It is very important to highlight that in some cases the smoke pipes
are under pressure and therefore, the connections of several ele-
ments must be airtight.
ANTI-FREEZE SYSTEM
The boiler is fitted as standard with an automatic anti-freeze sys-
tem that activates when the temperature of the water in the primary
circuit falls below 6 °C. This system is always active, guaranteeing
boiler protection to an outdoor temperature level of -3 °C. To take
advantage of this protection (based on burner operation), the boiler
must be able to switch itself on; any lockout condition (e.g. lack
of gas/electricity supply, or safety device intervention) therefore
deactivates the protection. The anti-freeze protection is also ac-
tive when the boiler is on standby. In normal operation conditions,
the boiler can protect itself against freezing. If the machine is left
unpowered for long periods in areas where temperatures may fall
below 0 °C, and you do not want to drain the heating system, you
are advised to add a specific, good quality anti-freeze liquid to the
primary circuit. Carefully follow the manufacturer's instructions with
regards not only the percentage of anti-freeze liquid to be used for
the minimum temperature at which you want to keep the machine
circuit, but also the duration and disposal of the liquid itself.
For the domestic hot water part, we recommend you drain the cir-
cuit. The boiler component materials are resistant to ethylene gly-
col based anti-freeze liquids.
3.2 Securing the boiler to the wall and hydraulic con-
nections
To fasten the boiler to the wall, use the cardboard template (fig.
4-5) in the packaging. The position and size of the hydraulic con-
nections are indicated below:
A CH return
B CH delivery
C gas connection 3/4"
D DHW output
E DHW input
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 room
thermostat (AT) to be carried out in the specific terminals.
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
3/4"
3/4"
1/2" (for C.A.I./C.S.I.) - 3/4" (for R.S.I.)
1/2" (for C.A.I./C.S.I.) - 3/4" (for R.S.I.)