INSTALLATION
2.5 Hydraulic Connections
Installation must be carried out following the regulations in force, trade practices and the recommendations contained in this leaflet.
WARNING
There must be no obstructions, complete or partial, between the boiler and the safety valves.
WARNING
Heating installations must be designed and assembled so that central heating water and any products introduced into it cannot find their way into the drinking water system. A removable connection must be installed for filling the heating circuit according to current regulations.
WARNING
If the distribution pipework is in copper, a sleeve in steel, cast iron or insulating material must be placed between the hot water outlet of the unit and this pipework so as to avoid any corrosion at the level of the branch pipe.
Notes:
-The safety unit and its connection to the tank must be at least of the same diameter as the tanks sanitary cold water supply pipework (minimum 3/4").
-The safety unit's outlet pipe must have sufficient, continuous slope and its section must be at least equal to that of the orifice for the safety unit outlet (so as to avoid slowing down the water flow when there is an excess of pressure).
-The level of the safety unit must be below that of the cold water inlet so it can be drained. If this is not the case, install a draining pipe at the lowest point of the tank (see drawing in Section 2.8).
•Before making the hydraulic connections for the central heating circuit, it is essential to flush the water system to eliminate any dirt which may damage certain parts (safety valve, pumps, flap valves . . .)
•Be careful to isolate hydraulically the primary and secondary circuits using stop valves. This will facilitate matters during maintenance.
Inclusion of these valves means that maintenance of the unit and its parts can be carried out without having to empty it. They also mean that the tank can be carried out without having to empty it. They also mean that the tank can be isolated whilst a watertight pressure test is carried out if the test pressure is above the pressure admitted by the tank.
2.6Connection of the Domestic Hot Water Circuit
The domestic hot water units can operate under a maximum service pressure of 10 bar. Generally, they operate at 7 bar.
•Before connecting the domestic hot water circuit, the pipework must be flushed to wash out any metal or other dirt which could damage certain parts (safety units, pump, valves
. . .).
•The connection between the safety valve and the unit must not contain any section parts. Also, the flow pipe for the safety valve must not be obstructed. If the supply pressure exceeds 5.5 bar, a pressure reducer must be included "upstream" of the tank. It is advisable to site the pressure reducer "downflow" of the water meter so as to have the same pressure in all the pipes.
•Include a drain valve in the boiler as well as a "syphon funnel" for the safety unit.
•Connection to the cold water supply must be carried out according to the drawing in section 2.8. Components must conform to the standards and regulations in force. A stop valve is installed into the cold water supply.
-To ensure hot water as soon as the taps are opened, a circulation loop between the mains supply and the re- circulation pipes of the unit can be installed.
2.7Important Recommendations for Connecting the Boiler to the Heating Circuit and the Drinking Water Supply
The installation shall be made in keeping with applicable regulations and codes of practice and the recommendations contained in these instructions.
The expansion vessel shall be connected to the boiler without any valve or stop valve between the boiler and the expansion vessel.
The heating system shall be designed and installed in a way as to prevent the water from the heating circuit and any substances added to it from flowing back into the drinking water circuit located before it. The installation shall not be directly connected to the drinking water system.
As a general rule, a check valve shall be fitted on the cold water supply pipe.
VERY IMPORTANT: under safety rules, a sealed safety valve calibrated to 7 bar shall be fitted on the cold water intake pipe of the hot water tank. We recommend membrane type hydraulic safety devices with the NF mark.
During normal valve operation some drops of water are lost each time the water is heated. This apparent leak is not only normal, but is actually a sign that the valve is operating correctly.
The safety valve shall always be placed on the cold water supply pipe and no valve or tap shall be fitted between the safety valve and the tank.
In order to ensure the continuous circulation of hot water in the installation and be able to draw hot water as soon as a tap is opened, a circulation loop may be installed between the drawing points and the tank recirculation tube. A non return valve shall be fitted on this loop.
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