6
BH 150
22/02/06 - 300001069-001-G
3 Connecting the tank to the domestic water circuit (secondary circuit)
When making the connections, it is imperative that the standards and
corresponding local directives are respected
These domestic hot water tanks can operate at a maximum operating
pressure of 10 bars. As a general rule, the tanks operate at 7 bars.
3.1
Specific precautions
Before making the connection,
rinse the domestic water inlet
pipes
to prevent the introduction of metal or other particles into the
DHW tank.
3.2
Provision for Switzerland
Make the connections according to the instructions of the Société
Suisse de l'Industrie du Gaz et des Eaux. Comply with local
instructions from water distribution plants.
3.3
Isolation valves
Hydraulically isolate the primary and secondary circuits using stop
valves to facilitate maintenance operations on the calorifier. 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 calorifier when conducting
a pressurised check on the leak tightness of the installation if the test
pressure for the calorifier is greater than the admissible operating
pressure.
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
3.4
Connecting the domestic cold water
To carry out connection with cold water (See next page). 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. Fit a non-return valve to the domestic cold water
circuit.
3.5
Safety valve
In compliance with the safety rules, fit a sealed safety valve
to the tank's domestic cold water inlet.
Calibration of the safety valve :
J
10 bar.
For France, we recommend hydraulic safety units fitted with a
membrane with the NF marking.
- Integrate the safety valve in the cold water circuit.
- Install the safety valve close to the calorifier in a place which is
easy to access.
Dimensions
The safety unit and its connection to the DHW tank must be of at least
the same diameter as the cold water supply pipe in the tank's
domestic circuit.
No isolating devices should be located between the safety valve or
unit and the tank.
The safety unit outlet pipe must have a uniform and sufficient gradient
and its diameter must be at least equal to that of the outlet opening
in the safety unit (to prevent the flow of water being hindered if the
pressure is too high).
The outlet pipe in the valve or safety unit must not be blocked.
France
The level of the safety unit must be lower than that of the cold water
inlet to enable draining. Otherwise, fit a drainage pipe to the lowest
point of the tank.
Germany
Define the dimensions of the safety valve in accordance with the DIN
1988 standard :
Fit the safety valve above the calorifier to obviate having to drain the
tank during servicing
Install the drainage valve at the lowest point on the calorifier.
Capacity
litres
Dimension of the valve
Min. dimension of the inlet
connection
Heating output
kW
max
< 200
R or Rp 1/2
75
200
J
1000
R or Rp 3/4
150
