User manual

Page 16
Water quality
The pH value of the water must be within the following limits: 7.5 < pH < 9.5. This pH
value is reached with the stable conditions. These stable conditions will occur, when after
filling the heating system (pH around 7) with fresh water, the water will lose it’s air
because of the air bleeding operation and heating up (dead water conditions).
Water hardness must be within the following limits:
3.5° Clark (50 ppm CaCO
3
) < Total Hardness < 10.5° Clark (150 ppm CaCO
3
)
When the water might contain aluminium particles, this should be of a maximum of 8,5
ppm. If there is the risk of contamination of the water by any kind of debris/chemicals in
the period after installing, a plate heat exchanger should be used to separate the boiler
circuit from the heating circuit, see drawings Pages 23 & 24
It is advised to prevent the possible air intake and water leakage of the central heating
system. Fresh oxygenated water might damage the heating system and the heat
exchanger of the boiler and should therefore be prevented! Usual spots where air is most
likely to seep in are: suction gaskets, pumps, air valve working as a venting pipe, O-rings /
gaskets in stuffing box, under floor heating pipes.
Plastic piping in the heating system
When non approved plastic pipes are used in the central heating system, these should
be separated from the boiler system by using a plate heat exchanger. Diffusion (of plastic)
can cause air to enter the heating system. Be aware that plastic piping is often used in
under floor heating systems. No separation of these non approved plastic systems will
change the warranty of the boiler and any boiler part .IE No warranty applies if separation
using a Plate Heat Exchanger is not utilised .
System
If the system is: 1) old or has had leaks resulting in poor water quality or 2) the system
cannot handle 1.50 bar, or 3) if plastic material for the flow and return from the radiators
or under floor heating is being used and not oxygen diffusion proof to DIN standard
4726/4729, a separation between the central heating water of the boiler and the system
will be required, using a plate heat (see Illustrations on page 23 & 24 ) exchanger . This
will prevent contamination of the boiler heat exchanger with magnetite, dirt etc. In the
instances 1,2 &3 failure to provide such separation could void the warranty.