Beretta MYNUTE GREEN 28 C.S.I Manual De Instalacion Y Uso página 5

3 - HYDRAULIC CONNECTIONS
Position and dimensions of hydraulic connections are specified in figure
3.1:
A - CH return 3/4"
B - CH delivery 3/4"
C - Gas connection 3/4"
D - DHW outlet 1/2" (C.S.I.)
E - DHW inlet 1/2" (C.S.I.)
F - Support plate
G - Pre-installation template.
If water hardness exceeds 28°Fr, it is recommended to use water softeners,
to prevent any limestone deposit in boiler due to excessively hard water.
4 - INSTALLING THE EXTERNAL PROBE (Fig. 4.1)
The correct position of the external probe is essential for the climatic control
function to run properly.
Install the supplied probe outside the building about 2/3 up the NORTH or
NORTH-WEST wall and far from flue pipes, doors, windows and sunny areas.
Attaching the external probe to the wall
• To access the terminal board and anchor holes, unscrew the plastic probe
cover from the housing by rotating it anticlockwise.
• Mark the points where the holes will be drilled using the probe housing as
a template.
• Remove the box and drill holes for 5x25 expansion grips.
• Fix the housing to the wall using the two supplied expansion grips.
• Unscrew the cable-holding nut, insert the bipolar cable (with a cross section
between 0,5 and 1mm 2 , not supplied) for the connection between the probe
and the boiler.
• For the electrical connection between the external probe and the boiler,
refer to the chapter "Electric connection".
• Tighten the cable-holding nut properly and close the cover of the protective
box.
The probe must be positioned on a smooth surface. In the case of a
brick wall or a wall with an irregular surface, provision must be made for
a smooth contact surface.
The maximum length of the connection between the external probe and
the boiler is 30 m.
The connection cable between the probe and the boiler must not have
connections. If these prove to be necessary, they must be made
watertight and suitably protected.
Any ducts for the connection cable must be separate from other power
lines (230 V.a.C.).
5 - CONDENSATE COLLECTION
The outlet collector (A, Fig. 5.1) collects: the condensate water, any
evacuation water from the safety valve and the system outlet water.
Use the supplied rubber hose to connect the manifold to a suitable waste
water collection and discharge system, in compliance with current
legislation.
The outlet connection line must have a guaranteed seal.
The manufacturer is not responsible for any damage caused by the
lack of a collection system.
6 - GAS CONNECTION
Before connecting appliance to gas pipe network, check the following:
• Regulations in force are met.
• Gas type used is the same as set for appliance operation.
• Pipes are clean.
Gas must be piped externally. If the pipe goes through a wall it must go
through the central opening in the lower part of the template. It is
recommended to install an appropriately sized filter on the gas line in case
gas from the mains contains some small solid particles. After installation
make sure that all the joints have been made airtight conforming to standard
installation practices.
7 - ELECTRIC CONNECTION
To access the electrical connections, proceed as follows:
• loosen the two fixing screws (D) and remove the shell (Fig. 7.1).
• release the panel and turn it forwards.
• open the terminal board cover by loosening the fasteners (Fig. 7.2).
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 165W (25 R.S.I. - 28 C.S.I. - 32 C.S.I. - 35 R.S.I. - 36 C.S.I.),
150W (15 R.S.I.) and 106W (12 R.S.I.) and complies with EN 60335-1
standard.
Connect the boiler to an safe earth circuit according to current legislation.
The installer is responsible for ensuring the appliance is suitably
earthed; the manufacturer declines all liability for any damage deriving
from incorrect or omitted earthing.
Live and neutral (L-N) connections should also be respected.
The earth conductor must be a couple of cm longer than the others.
The boiler can operate with phase-neutral or phase-phase power supply.
For floating power supply, without an earth-bonded conductor, it is necessary
to use an insulation transformer with secondary anchored to ground.
Gas and/or water pipes may not be used to earth electrical equipment.
Use the supplied power cable to connect the boiler to the mains power
supply.
Connect the ambient thermostat and/or external programmable timer clock
as shown in the electrical diagram on page 141.
When replacing the power cable, use a HAR H05V2V2-F cable, 3x 0,75
mm 2 , max. external Ø 7 mm.
8 - FILLING AND EMPTYING THE SYSTEM
After making the hydraulic connections, fill the heating system. This must be
done while the installation is cold by:
• Giving two or three turns to the cap of the lower automatic air vent valve
(A, Fig. 8.1-8.2) to open it.
For C.S.I. models
• Make sure the cold water inlet tap (B, Fig. 8.1) is open.
• Open the filling tap (C, Fig. 8.1) until the pressure indicated on the water
gauge is between 1 bar and 1.5 bar (Fig. 8.3).
• Close the filling tap.
For R.S.I. models
As the boiler does not have a manual filling tap, install an external
tap or check whether the external water tank is fitted with one.
• Fill the system using the external tap until the pressure indicated on the
water gauge lies between 1 bar and 1.5 bar (Fig. 8.3).
• Close the external filling tap.
N.B. - The boiler is automatically vented through the two automatic air vent
valves A (Fig. 8.1-8.2) and E (Fig. 8.4), the first is positioned on the circulator
while the second is located inside the air distribution bos.
If the venting phase proves to be difficult, proceed as follows.
Suggestions for correctly venting the air from the heating circuit and
the boiler
When installing the boiler or when carrying out extraordinary maintenance
operations, proceed as follows:
1. Use a CH11 wrench to open the manual breather valve located over the
air distribution box (Fig. 8.5): connect the hose supplied with the boiler
to the valve in order to discharge the water into an external container.
2. Open the manual filling tap on the hydraulic assembly and wait until
water starts flowing from the valve.
3. Power the boiler leaving the gas tap closed.
4. Use the room thermostat or the remote control panel to activate request
for heat so that the three-way will turn to heating.
5. Turn on a tap to activate request for hot water (for instantaneous boilers
only; use the water heater thermostat for boilers just for heating connected
to an external water heater) for an interval of 30" every minute to make
the three-way cycle from heating to hot water and vice versa about ten
times (the boiler will be go into alarm as there is no gas under these
circumstances, it must therefore be reset every time this happens).
6. Continue the sequence until water only comes out of the manual air vent
valve and the flow of air has finished; close the manual air vent valve at
this point.
7. Make sure the system is at the correct pressure (1 bar is ideal).
8. Close the manual filling tap on the hydraulic assembly.
9. Open the gas tap and switch on the boiler.
CH system emptying
Before starting work, disconnect the mains power supply by turning off the
main switch.
• Close the on-off taps of the heating system
• Manually loosen the system drain valve (D, Fig. 8.1-8.2)
• The system water is discharged through the outlet collector (F, Fig. 8.1-
8.2).
Use the supplied rubber hose to connect the manifold to a suitable waste
water collection and discharge system, in compliance with current
legislation.
ENGLISH
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