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Water connections
6.2 General system requirements (to be provided by the customer)
6.2.1 Air vent valves
Provide vent valves at all high points of the system to allow air to escape from it.
6.2.2 Water filter on Domestic Hot Water side
Install a filter to capture any water impurities, to avoid clogging the system and the exchanger, which should
be installed immediately at the mains water inlet and in a position easily accessible for cleaning.
The filter is to be provided by the customer, installed on site, never removed and periodically checked for
clogging.
6.2.3 System side water filter
It is mandatory to install a filter on the return line of the system in order to maintain optimal operation of the
unit.
The mesh filter standard supplied with the unit should never be removed and periodically checked for
clogging.
In addition to the filter supplied, we recommend installing a dirt separator filter to trap not only general dirt,
but also fine ferromagnetic particles and parts dispersed during use that are not trapped by the mesh filter.
If both are present, place the mesh filter upstream on the return line.
Compatibly with the need to limit pressure drops, having a double filter of dierent types in series will protect
the unit better from dirt and impurities in the carrier fluid.
6.3 Water pipes
The water circuit connections must be done correctly and in accordance with the unit's specifications,
respecting the water entering and leaving.
The system must always meet the minimum requirements for water quantity and quality and be protected
from sludge, contaminants and encrustations.
6.3.1 General instructions for piping
Always take the following into consideration when connecting the water circuit:
• use only clean pipes: air, humidity, dirt or dust can cause problems;
• keep the end of the pipe downwards when removing burrs;
• cover the end of the pipe when inserting it through a wall to prevent dust and dirt from entering;
• use a good thread sealant to seal the connections. The seal must be able to withstand the pressures and
temperatures of the circuit;
• when using non-copper metal piping, isolate the two types of materials from each other to prevent
galvanic corrosion;
• pay attention not to deform the pipes by using excessive force or unsuitable tools during connection: this
could cause the unit to malfunction.
Unsuitable tools can damage the pipes.
Fig. 32
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