Eliminating The Air From The Heating Circuit And Boiler; Electrical Wiring - Beretta Mynute Green E 25 C.S.I. Manual Para El Instalador Y El Usuario

3.3

Eliminating the air from the heating circuit and boiler

During the initial installation phase, or in the event of extraordinary
maintenance, you are advised to perform the following sequence of
operations (Fig. 2):
1. Open by two or three turns the automatic relief valve cap (A) and
leave it open.
2. Open the system filling tap located on the water unit.
3. Switch on the electricity supply to the boiler, leaving the gas tap
turned off.
4. Activate a heat request via the ambient thermostat or the remote
control panel, so that the 3-way valve goes into heating mode.
5. Activate a domestic water request as follows: open a tap for 30"
every minute so the 3-way valve passes from heating to domes-
tic water and vice versa about 10 times. In this situation, the
boiler will go into alarm mode due to the absence of gas, so it
must be reset every time this happens).
6. Continue the sequence until no more air can be heard coming
from the air vent valve.
7. Check the system pressure level is correct (the ideal level is 1
bar).
8. Turn off the system filling tap.
9. Turn on the gas tap and ignite the boiler.
3.4 Positioning the wall-mounted boiler and hydraulic
connections
The boiler is supplied as standard with a boiler support plate with
built-in pre-assembly template (Fig. 3). The position and dimension
of hydraulic fittings are shown in the detail drawing.
For the assembly, proceed as follows:
- secure the boiler support plate (F) using the pre-assembly template
(G) to the wall and use a spirit level to make sure that everything
is perfectly horizontal
- mark the 4 holes (ø 6 mm) envisaged for securing the boiler sup-
port plate (F) and the 2 holes (ø 4 mm) for securing the pre-assem-
bly template (G)
- make sure that all measurements are exact, then drill the wall us-
ing drill tips with the diameters indicated above
- fix the plate with the built-in template to the wall.
Make the hydraulic connections.
The position and size of the hydraulic connections are indicated be-
low:
R heating return line
M heating delivery
G gas connection
AC hot water
AF cold water
3.5 Installing the external probe
The correct operation of the external probe, supplied as an accesso-
ry, is fundamental for the good operation of the climatic control.
INSTALLING AND CONNECTING THE EXTERNAL PROBE
The probe must be installed on an external wall of the building to be
heated, 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
solar irradiation;
- it must be mounted about 2/3 of the way up the wall;
- it must not be mounted near doors, windows, air outlet points, or
near smoke pipes or other heat sources.
The electrical wiring to the external probe is made with a bipolar ca-
ble with a section from 0.5 to 1 mm2 (not supplied), with a maximum
length of 30 metres. It is not necessary to respect the polarity of the
cable when connecting it to the external probe. 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 ca-
bles (230V AC)
3/4" M
3/4" M
3/4" M
1/2" M
1/2" M
FIXING THE EXTERNAL PROBE TO THE WALL
The probe must be placed on a smooth part of the wall (Fig. 4); 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 card 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 probe connec-
tion cable and connect it to the electric clamp.
To make the electrical connection between the external probe and
the boiler, refer to the "Electrical wiring" chapter.
Remember to close the cable grommet well, to prevent any air
humidity getting in through the opening.
Put the card back in its seat.
Close the plastic upper protective cover by turning it clockwise. Tight-
en the cable grommet very well.
3.6 Condensate collection
The discharge manifold (Fig. 5) collects condensate water, any evac-
uation water from the safety valve and the system discharge water.
The manifold must be connected via a rubber pipe (not provid-
ed) to an appropriate collection and evacuation system in the
white water discharge drain in compliance with current regula-
tions. The outer diameter of the manifold is 20 mm: it is there-
fore advisable to use a rubber pipe Ø 18-19 mm closed with a
suitable clamp (not provided).
The manufacturer is not liable for any damage/flooding result-
ing from the failure to channel the condensate.
Sealing of the condensate drainage connection line must be
guaranteed.
3.7

Electrical wiring

To access the electrical wirings, proceed as follows:
To access the terminal board:
- set the system's main switch to off
- undo the fixing screws (A) of the shell (fig. 6)
- move the shell base forward and then upwards to unhook it from
the chassis
- lift and then turn the instrument panel upside down (fig. 7)
- remove the electrical parts inspection cover (fig. 8)
The connection to the mains supply must be made via a separation
device with an omnipolar opening of at least 3.5 mm (EN 60335/1,
category 3).
The appliance operates with an alternating current of 230 Volt/50 Hz
and complies with the standard EN 60335-1.
It is obligatory to make the connection with a safe ground/earth,
in compliance with current directives.
The installer is responsible for ensuring the appliance is suita-
bly earthed; the manufacturer will not be liable for any damage
resulting from an incorrect or absent earth connection
It is also advisable to respect the phase-neutral connection
(L-N).
The ground/earth wire must be a couple of cm longer than the
others.
The boiler can operate with a phase-neutral or phase-phase supply.
For power supplies that are not earthed, it is necessary to use an
isolating transformer with earth-anchored secondary.
It is forbidden to use gas and/or water pipes to earth electrical ap-
pliances.
Use the power cable supplied to connect the boiler to the mains pow-
er supply.
If the power cable needs to be replaced, use a cable of the HAR
H05V2V2-F type, 3 x 0.75 mm², with a maximum external diameter
of 7 mm (fig. 9).
Mynute Green E C.S.I.
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