3.4.2 Connecting the domestic hot water circuit
3.4.3 Connecting the domestic hot water circuit
3.4.4 Fill the domestic hot water tank.
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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 water
outlet/inlet of the domestic hot water tank and the pipework to avoid any corrosion at the union.
2.Mount a domestic water thermostatic mixer valve (not provided) on the domestic hot water tank outlet:
• France: The thermostatic mixer valve is mandatory if any tap in the loop is not thermostatic
• Other countries: the thermostatic mixer valve is recommended.
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.
Install a water drain in the boiler room and a funnel-siphon for the safety unit.
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.
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.
Make the connection to the domestic cold water.
When the water and electrical connections are made, fill the domestic hot water tank.
Turn on a hot water tap.
Open the cold water tap located on the safety unit to vent the air in the installation.
Close the hot water tap when water starts to flow from the tap.The domestic hot water tank is full.
Check the tightness of the pipe connections and the correct operation f the hydraulic devices
by successively opening the drain valve on the safety unit.
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