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3.7 HYDRAULIC CONNECTIONS
The hydraulic connections have to be done in accordance with national and local regulations. Pipes can be made up
of multilayer pipe, polyethylene or stainless steel and must withstand at least 100°C and 10 bar. Pipes have to be
designed depending on the desired water flow and on the hydraulic pressure drops of the system. All pipes have to
be insulated with closed-cell material of adequate thickness. Units should be connected to piping by means of flexible
joints. Piping should include:
• Y-shaped metallic filter (to be mounted on the inlet pipe) with a mesh not larger than 1mm.
• Automatic charging group (3 bar advised) when water supply pressure is higher than 5,5 bar.
• Hydraulic safety group (8 bar).
• Manual gate valves to separate the unit from the hydraulic circuit.
• Manual gate valve on the inlet pipe to discharge the unit if necessary.
• Thermometers for wells to monitor the system's temperature.
• Expansion tanks, safety valves and air vents where indicated in the following installation diagrams.
Perform the connections making sure that weight of the pipes do not overload the unit.
Check the water hardness, which should not be below 12°f. With particularly hard water, it's
recommended the use of a water softener so that the residual hardness is no more than 20°f
and no less than 15°f.
WARNING: When it's possible, connect the pipes to the hydraulic connections always using the
system key against key.
WARNING: Unit water inlet pipe have to be in correspondence with the blue connection,
otherwise the unit malfunction could occur.
WARNING: It is compulsory to install on the WATER INLET connection a metallic filter with
a mesh not larger than 1 mm. Should the filter not be installed, the warranty will no longer
be valid. The filter have to be kept clean, so make sure that it is clean after the unit has been
installed, and then check it periodically.
Perform the drainage/piping work according to the installation instruction. If there is a defect
in the drainage/piping work, water could leak from the unit and household goods could get wet
and be damaged.
The hot water needs to mix with cold water for terminal usage, too hot water (over 50°C) in
the heating unit may cause injury. It's necessary to follow the local regulation and it's anyway
recommended the use of anti-scald valves.
The diagrams are to be considered only for indication purpose. It is always required the study of
the specific installation context and the approval of the system by a qualified heating engineer
designer.
3.7.1 Water connections
Please pay attention to the below points when connecting the water loop pipe:
1. Try to reduce the water loop resistance.
2. Make sure that there is nothing in the pipe and the water loop is smooth, check the pipe carefully to see if there
is any leak, and then pack the pipe with the insulation.
3. Install the hydraulic safety group in the water inlet.
4. Install also an expansion tank suitably sized to absorbe volume variations.
5. The nominal pipe diameter must be selected on the basis of the available water pressure and the expected
pressure drop within the piping system.
6. The water pipes may be of the flexible type. To prevent corrosion damage, make sure that the materials used
in the piping system are compatible.
7. During the installation of the pipes on site, any contamination of the piping system must be avoided.
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