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INSTALLATION
Make water connections to the plant ensuring that:
− they do not rest on the unit
− maintenance operations of the unit are allowed
− access to and removal of accessories is allowed
A correct installation requires to:
− disconnect the unit from the system before carrying out
electric welding
− wash the system thoroughly before carrying out the
hydraulic connections of the unit
− install a safety valve and an expansion tank dimensioned
in compliance with the current regulations. The unit
installation must necessarily provide for a device against
overpressure connected to the cold water tube, whose
maximum calibration must be equal to the maximum
operating pressure value indicated in the technical
features. The device must comply with the regulations in
force in the country where the installation takes place
2 .4 .2 Example of system diagram
15
4
5
6
6
4
4
7
7
10
8
9
1
Supplementary coil (NexPro 300 S Plus e NexPro 300 CS Plus)
2
Boiler coil (NexPro 300 CS Plus)
3
Solar collectors
4
Temperature sensor
5
Safety valve
6
Check valve
7
Non-return valve
8
Solar heating circuit pump
9
Flow regulator
10 Expansion tank
11
Drain
12 Recirculation pump
The diagram above is only a general schematic and does not replace the technical design according to the state of the art.
3
5D
2D
P
2
11
1
6
− Check the hardness of the water, which must not be less
than 12 ° F . With particularly hard water, it is recommended
the use of a water softener in such a way that the residual
hardness not exceeding 30 ° F .
9
For water treatment, refer to the prevailing regulations.
9
Hot water is supplied with a temperature over 50° C on the
faucet of use can cause serious burns. It therefore requires
the use of a thermostatic mixing valve.
9
This valve will be required for solar panel installations.
9
The use of hoses too short or too rigid facilitates the
transmission of vibrations and the generation of noise.
9
Provide the hydraulic connections to copper pipes with a
dielectric connector to prevent corrosion due to iron/copper
galvanic currents
13
6
7
12
4
6
16
17
6
6
6
5
6
6
11
10
13 Domestic hot water outlet
14 Domestic cold water inlet
15 Bleed valve
16 Automatic vent
17 Pump
18 To heating utilities
19 From heating utilities
20 Pressure gauge
21 Control valve
22 Pressure reducer
23 Backflow preventer
24 Heating circuit filling
10
16
19
18
6
10
6
23
21
7
22
6
14
5
11
20
6
11
6
24
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