Water Connections - Ferroli OPTIMAX 25 S Instructions For Use, Installation And Maintenance

2.3 Water connections

The heating capacity of the unit should be previously established by calculating the building's heat
requirement according to current regulations. For good operation and long life of the boiler, the plum-
bing system must be well proportioned and always complete with all those accessories that guarantee
regular operation and running.
If the fl ow and return pipes follow a path where air pockets could form in certain places, it is advisable
to install air vents at these points. Also, install a drain plugs at the lowest point in the system to allow
its complete emptying.
If the boiler is installed at a lower level than the system, it is advisable to provide a non-return valve to
prevent the natural circulation of system water.
The temperature differential between the fl ow and the return to the boiler should not exceed 20° C
(11° recommended).
Do not use the water system pipes to earth electrical appliances.
Before installation, carefully clean all the pipes of the
system to remove residues or impurities that could affect
the unit's good working. Flush system in accordance with
BS 7593.
Make the connections to the corresponding connections
as shown in Fig. 3.
Key
1 CH fl ow (22 mm with isolation valve)
2 Gas inlet (22 mm with isolation valve)
3 Condense outlet
4 CH return (22 mm with isolation valve)
It is advisable to install isolation valves between the boiler and heating system allowing the boiler to be
isolated from the system if necessary.
The safety valve outlet must be connected to a tun-dish or collection pipe to prevent water fl owing
out onto the ground in the event of over-pressure in the heating circuit. If this is not done, and the
drain valve trips and fl oods the room, the boiler manufacturer is not to be held responsible.
Make the boiler connection in such a way that its internal pipes are free of stress.
10
fi g. 3
Optimax 25 S
40 124 186
400
1 2 3
50
4