7.3.2 Connecting the domestic hot water tank to the cold water
circuit
1. Install a pressure reducer if the mains pressure exceeds 80% of the
calibration of the safety valve or unit (e.g. 0.55 MPa (5.5 bar) for a
safety unit calibrated to 0.7 MPa (7 bar)).
Caution
Install the pressure reducer upstream of the appliance and
downstream of the water meter in such a way as to ensure the
same pressure in all of the system's pipes.
2. Install a non-return valve between the safety unit and the pressure
reducer to prevent the backflow of domestic hot water into the
domestic cold water circuit.
3. Install a water drain in the boiler room and a funnel-siphon for the
safety unit.
4. Incorporate a sealed safety valve calibrated to 0.7 MPa (7 bar) (not
provided) on the domestic cold water inlet, close to the tank, in a
position which is easy to reach, to protect the domestic hot water tank
from pressure surges.
Caution
There must be no cut-off devices between the safety valve or unit
and the domestic hot water tank.
5. To avoid restricting the flow of water in the event of overpressure:
the safety unit discharge pipe must be kept in the open, in a frost-
free environment, and have a continuous, downward gradient;
the diameter of the safety unit and its connection to the tank must
be at least equal to the diameter of the domestic cold water inlet on
the tank.
6. Make the connection to the domestic cold water.
7.3.3 Connecting the domestic hot water circuit
The dielectric unions are provided in the documentation bag.
1. A dielectric union must be connected using hemp fibre or pipe joint
compound, between the hot water outlet (red collar) of the domestic
hot water tank and the pipework to avoid any corrosion at the union.
2. A dielectric union must be connected using hemp fibre or pipe joint
compound, between the cold water inlet (blue collar) of the domestic
hot water tank and the pipework to avoid any corrosion at the union.
3. Mount a domestic water thermostatic mixer valve (not provided) on the
domestic hot water tank outlet:
France: the thermostatic mixer valve is mandatory.
Other countries: the thermostatic mixer valve is recommended.
7.4
Connecting the refrigeration connections
To allow exchanges between the domestic hot water tank and the outdoor
unit, 2 refrigerant connections must be made: send and return.
Pursuant to directive L. 517/2014, the installation of equipment must be
done by a certified operator whenever the refrigerant load is in excess of
two kilograms or when a refrigerant connection is necessary (the case with
split systems, even when fitted with a quick coupling device).
Fig.40
7 Installation
38 7740327 - v03 - 03122019
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