Securing The Boiler To The Wall And Hydraulic Connections; Gas Connection; Electric Connection - Beretta MYNUTE BOILER GREEN 25 B.S.I. E Para El Instalador

ENGLISH
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 5 °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 Cleaning the system and characteristics of the
heating circuit water
In the case of a new installation or replacement of the boiler, it is
necessary to clean the heating system.
To ensure the device works well, top up the additives and/or chemi-
cal treatments (e.g. antifreeze liquids, filming agents, etc.) and
check the parameters in the table are within the values indicated.
Unit of
Parameters
measurement
pH value
Hardness °F
Appearance
3.3 Securing the boiler to the wall and hydraulic con-
nections
To fasten the boiler to the wall, use the crossbar (fig. 4) in the
packaging. The position and size of the hydraulic connections are
indicated below:
A CH return 3/4"
B CH delivery 3/4"
C

gas connection

3/4"
D DHW output 1/2"
E DHW input 1/2"
If water hardness exceeds 28°Fr, it is recommended to use water
softeners, to prevent any limestone deposit in boiler due to exces-
sively hard water.
3.4 Installation of the external sensor (fig. 3)
The correct operation of the external sensor is fundamental for the
good operation of the climate control.
INSTALLING AND CONNECTING THE EXTERNAL SENSOR
The sensor must be installed on an external wall of the building to
be heated, observing the following indications:
6
Hot water
Filling water
circuit
7–8 -
- 15–20
- clear
it must be mounted on the side of the building most often exposed
to winds (the NORTH or NORTHWEST facing wall), avoiding direct
sunlight; it must be mounted about two thirds of the way up the wall;
it must not be mounted near doors, windows or air outlet points,
and must be kept away from smoke pipes or other heat sources.
The electrical wiring to the external sensor is made with a bipolar
cable with a section from 0.5 to 1 mm2 (not supplied), with a maxi-
mum length of 30 metres. It is not necessary to respect the polarity
of the cable when connecting it to the external sensor. Avoid mak-
ing any joints on this cable however; if joints are absolutely neces-
sary, they must be watertight and well protected. Any ducting of
the connection cable must be separated from live cables (230Vac).
FIXING THE EXTERNAL SENSOR TO THE WALL
The sensor must be fixed on a smooth part of the wall; in the case
of exposed brickwork or an uneven wall, look for the smoothest
possible area. Loosen the plastic upper protective cover by turning
it anticlockwise.
After deciding on the best fixing area of the wall, drill the holes for
the 5x25 wall plug. Insert the plug in the hole. Remove the board
from its seat.
Fix the box to the wall, using the screw supplied. Attach the brack-
et, then tighten the screw. Loosen the nut of the cable grommet,
then insert the sensor connection cable and connect it to the elec-
tric clamp.
To make the electrical connection between the external sensor and
the boiler, refer to the "Electrical wiring" chapter.
Remember to close the cable grommet properly, to prevent
any humidity in the air getting in through the opening.
Put the board back in its seat.
Close the plastic upper protective cover by turning it clockwise.
Tighten the cable grommet securely.
3.5 Condensate collection
The system must be set up so as to avoid any freezing of the con-
densate produced by the boiler (e.g. by insulating it). You are ad-
vised to install a special drainage collection basin in polypropylene
(widely available on the market) on the lower part of the boiler (hole
Ø 42), as shown in fig. 5. Position the flexible condensate drainage
hose supplied with the boiler, connecting it to the manifold (or an-
other connection device which allows inspection) avoiding creating
any bends where the condensate could collect and possibly freeze.
The manufacturer will not be liable for any damage resulting from
the failure to channel the condensate, or from its freezing.
The drainage connection line must be perfectly sealed, and well
protected from the risk of freezing.
Before the initial start-up of the appliance, check the condensate
will be properly drained off.
3.6 Gas connection
Before connecting the appliance to the gas supply, check that:
- national and local installation regulations are complied with
- the gas type is the one suitable for the appliance
- the piping is clean.
The gas pipe must be installed outdoors. 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 contains solid particles.
Once the appliance has been installed, check the connections are
sealed according to current installation regulations.

3.7 Electric connection

To access the electrical wiring, proceed as follows:
- turn off the main switch on the system
- loosen the fixing screws (A fig. 7) and remove the shell
- release the panel and turn it forwards
- unscrew the two screws of the small cover on the electronic
board to have access to the terminals
Connect the appliance to the mains power supply with a switch
featuring a distance of at least 3,5 mm (EN 60335-1, category III)
between each wire.
The appliance operates with an alternating current of 230 Volt/50
Hz, has a power input of 123W (25 B.S.I.), 137W (32 B.S.I.) and
complies with EN 60335-1 standard.