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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 plumbing 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 plug at the lowest point in
the system to allow its complete emptying, when required.
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, thoroughly clean all the pipes of the system
to remove residues or impurities that could affect the unit's
operation. Flush system in accordance with BS 7593.
Make the connections to the corresponding tappings as shown
in fi g. 3.
Key
1
CH fl ow (22 mm with compression coupler fi tted)
2
Gas inlet (22 mm with isolation valve)
3
Condense outlet
4
CH return (22 mm with compression coupler fi tted)
It is advisable to install anti-tamper isolation valves between the boiler and heating system allowing
the boiler to be isolated from the system if necessary.
10
fi g. 3
Optimax 25 OV
2
1
164
201
400
3
95
120
185
50
35
4
35
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