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).
Install the second dielectric union delivered on the domestic cold
water inlet.
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.
France: 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
Isolation valves
Hydraulically isolate the primary and domestic circuits with isolation valves
to facilitate maintenance on the domestic hot water tank. The valves make
it possible to carry out maintenance on the domestic hot water tank and its
components without draining the entire installation.
These valves are also used to isolate the domestic hot water tank when
conducting a pressurised check on the tightness of the installation if the
test pressure is greater than the admissible operating pressure for the
domestic hot water tank.
Connecting the domestic cold water
Connect to the cold water supply according to the hydraulic installation
diagram.
The components used for the connection to the cold water supply must
comply with the prevailing standards and regulations in the country
concerned.
Install a water drain in the boiler room and a funnel-siphon for the safety
unit.
5 Installation
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