31
7638897 - v0
2
- 14032016
■
Safety valve or unit
Caution
In accordance with safety rules, a safety valve calibrated to 0.7
MPa (7 bar) is mounted on the water heater's s domestic cold
water inlet.
●
We recommend NF-marked hydraulic diaphragm safety control 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 outlet pipe in the safety valve or unit must not be blocked.
To avoid restricting the flow of water in the event of overpressure:
●
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 stop valves
to facilitate maintenance on the water heater.
The valves make it possible to carry out maintenance on the tank and its
components without draining the entire installation.
●
These valves are also used to isolate the water heater when conducting
a pressurised check on the tightness of the installation if the test
pressure is greater than the admissible operating pressure for the water
heater.
Caution
If the mains pipes are made of copper, fit a sleeve made of
steel, cast iron or any other insulating material between the
tank's hot water outlet and the pipes to prevent corrosion to the
connection.
■
Connecting the domestic cold water
●
Make the connection to the cold water supply according to the hydraulic
installation diagram.
●
Install a water drain in the boiler room and a funnel-siphon for the
safety unit.
●
The components used for the connection to the cold water supply must
comply with the prevailing standards and regulations in the country
concerned.
■
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 installed 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.
6 Installation
