Installation Regulations - Beretta MYNUTE GREEN 50 R.S.I. Manuel D'utilisation

- a second level anti-freeze function (for installation area temperatures down
to -15°C), using the electric resistor kit that prevents the condensate in
the boiler from freezing
- diagnosis for absence of circulation (via the display of the temperatures
read by the delivery and return probes)
- a differential pressure switch allowing burner ignition if a minimum water
circulation is guaranteed in the primary circuit heat exchanger
- diagnosis for absence of water (via the pressure sensor)
- a flue gas safety evacuation system incorporated in the pneumatic
operation of the gas valve
- diagnosis for overtemperature (on both the delivery and return lines, with
dual probe - limit temperature 95°C
- a fan check, via a Hall-effect revolutions counter: the rotation speed of
the fan is always monitored.
The boiler is suitable for the connection of the following devices:
- an external 3-way valve
- a supplementary circulator
- an ambient thermostat or hourly timer
- an external probe for thermoregulation
- a remote control
- a safety thermostat for low temperature systems
- a remote thermostat or storage tank probe.
3 - INSTALLATION

3.1 Installation regulations

Installation must be carried out by qualified personnel, in accordance with
local regulations.
POSITION
The boiler can operate in a temperature range from -15°C to +60°C.
ANTI-FREEZE SYSTEM
The boiler is fitted as standard with an automatic anti-freeze system that acti-
vates when the temperature of the water in the primary circuit falls below 6°C.
This system is always active, guaranteeing boiler protection down to an
installation area temperature of -1°C.
To take advantage of this protection (based on burner operation), the
boiler must be able to switch itself on; any lockout condition (for ex.
due to a lack of gas or electrical supply, or the intervention of a safety
device) therefore deactivates the protection.
Should it be necessary to protect the boiler for installation area tem-
peratures down to -15°C, you must use the specific anti-freeze kit that
prevents the condensate in the boiler from freezing.
To use the anti-freeze protection, an electrical\ supply is required; this
means that any blackout or disconnection will deactivate the protec-
tion.
The anti-freeze protection is also active when the boiler is on standby.
In normal operation conditions, the boiler can protect itself against freezing.
In areas where temperatures may fall below 0°C, or when the machine is left
unpowered for long periods, you are advised to use a good quality anti-freeze
liquid in the primary circuit to avoid the risk of freezing if you do not want to
drain the heating system. 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 hot domestic water
part, we recommend you drain the circuit.
The boiler component materials are resistant to ethylene glycol based anti-
freeze liquids.
MINIMUM DISTANCES
In order to have access to the boiler to perform regular maintenance opera-
tions, respect the minimum clearances foreseen for installation (fig. 16a).
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 protected with
proper insulation.
IMPORTANT
Before installation, wash all system piping carefully in order to remove any
residues that may impair the operation of the appliance.
Connect the drain manifold to a suitable drainage system (for details, re-
fer to chapter 3.6). The domestic hot water circuit does not need a safety
valve, but make sure that the pressure of waterworks 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 indi-
cating 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
elements must be airtight.
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. It is advisable to place a filter on the system to
hold back the impurities (a sludge remover filter).
4
To ensure the device works well, top up the additives and/or chemical treat-
ments (e.g. antifreeze liquids, filming agents, etc.) and check the param-
eters in the table are within the values indicated.
Parameters Unit of
measurement
pH value
Hardness °F
Appearance
3.3 Securing the boiler to the wall and hydraulic
connections
Before installing, check you have the necessary spaces for the system,
considering the dimensions of the boiler, the flue gas discharge system,
and the hydraulic circuit.
The boiler is supplied as standard with a boiler support plate F (fig.16). The
position and dimensions of the hydraulic connections are shown in detail.
In addition, a cardboard template is included with the standard equipment
to assist the installer in his work.
For the assembly, proceed as follows:
- fix the boiler support plate to the wall and, with the aid of a level, check it
is perfectly horizontal
- mark the position of the 4 holes needed for fixing the boiler support plate
- check all the measurements are precise, then drill the holes using a bit
with the diameter indicated above
- fix the plate to the wall
For mounting accessories, refer to the instructions supplied.
Make the hydraulic connections and provide the discharge of the safety
valve and the 3-way tap (if installed).
The manufacturer is not liable for damage caused by the failure to
connect the discharges of the devices in question.
Make the hydraulic connections.
3.4 Installing the upper cover
Fit the upper cover and fix it to the boiler with the screws A (fig. 17) supplied.
The cover must be fitted before installing the suction and flue gas
discharge system.
When you need to remove the casing, loosen the 3 fixing screws of
the upper cover.
The manufacturer will not be liable for any damage resulting from the
failure to fit the covers.
3.5 Installation of the external sensor (fig. 19)
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 heat-
ed, observing the following indications:
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 mm
of 30 metres. It is not necessary to respect the polarity of the cable when
connecting it to the external sensor. Avoid making any joints on this cable
however; if joints are absolutely necessary, they must be watertight and
well protected. Any ducting of the connection cable must be separated from
live cables (230V AC).
FIXING THE EXTERNAL SENSOR TO THE WALL
The sensor must be fixed on a smooth part of the wall; in the case of ex-
posed 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 bracket, then tighten the screw.
Loosen the nut of the cable grommet, then insert the sensor connection
cable and connect it to the electric 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.
Hot water Filling
circuit water
7–8
- 15–20
- clear
(not supplied), with a maximum length
2
-