Specific precautions
Caution
Do not connect the domestic hot water connection directly to
copper pipes in order to prevent galvanic couplings in iron/copper
(risk of corrosion).
It is compulsory to fit the domestic hot water connection with a
dielectric union (provided).
Safety valve or safety unit
Caution
Germany: In accordance with the safety regulations, a safety
unit calibrated to 0.6 MPa (6 bar) must be fitted on the domestic
cold water inlet on the domestic hot water tank.
Belgium: In accordance with the safety regulations, a safety unit
calibrated to 0.7 MPa (7 bar), and approved by Belgaqua, must
be fitted on the domestic cold water inlet on the domestic hot
water tank.
Other countries: In accordance with the safety regulations, a
safety unit calibrated to 0.7 MPa (7 bar) must be fitted on the
domestic cold water inlet on the domestic hot water tank.
We recommend NF-marked hydraulic diaphragm safety units.
Integrate the safety valve in the cold water circuit.
Install the safety valve close to the water heater in a place with easy
access.
Sizing
The diameter of the safety unit and its connection to the water heater must
be at least equal to the diameter of the domestic cold water inlet on the
water heater.
There must be no cut-off devices between the safety valve or unit and
the water heater.
The discharge pipe in the safety valve or unit must not be blocked.
To prevent the flow of water being hindered or obstructed in the event of a
pressure surge:
The discharge pipe from the safety unit must have a continuous and
sufficient gradient, and its cross section must be at least equal to the
cross section of the opening of the safety unit outlet (to prevent the flow
of water being hindered if the pressure is too high).
The cross section of the discharge pipe from the safety unit must be at
least equal to the cross section of the opening on the safety unit outlet
Pressure reducer
If the supply pressure exceeds 80% of the safety valve or unit calibration
(e.g.: 0.55 MPa/5.5 bar for a safety unit calibrated to 0.7 MPa/7 bar), a
pressure reducer must be located upstream of the appliance.
Install the pressure reducer downstream of the water meter in such a way
as to ensure the same pressure in all of the system's pipes.
Measures to take to prevent hot water flow return
Fit a non-return valve to the domestic cold water circuit.
5 Installation
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TWH 200 EV
EN-7602142 - v11 - 24042019
