1. Using an additive in the fill water to prevent the hardness (lime) sepa
rating inside the boiler and to ensure that the pH value of the system
water remains stable (hardness stabiliser).
2. Use of a softening system to treat the fill water.
3. Use of a desalination system to treat the fill water.
Desalination of fill and top-up water to obtain fully desalinated water
should not be mistaken for softening down to 0 °dH. Corrosive salts
remain in the water with softening.
Caution
Use only approved additives and processes.
When using additives, use only agents approved by Potterton
Commercial. Softening and desalination must also only be carried
out with systems approved by Potterton Commercial and with ob
servation of the specified limits.
Failure to observe this rule voids the warranty.
Caution
Check the pH value.
Certain conditions may result in automatic alkalisation (raising the
pH value) of the system water. The pH value should therefore be
checked annually.
The pH value must be between 8.2 and 9.0.
Caution
Adherence to the conditions issued by Potterton Commercial is vi
tal to safeguard the warranty.
Note
The water hardness of the heating water has to be checked within
the scope of the recommended maintenance of the boiler and the
corresponding amount of additive has to be added if necessary.
5.2.4 Further information on the heating water
The water must not contain any foreign matter, such as sweat beads,
rust particles, scale or sludge. During commissioning, flush the system
until only clean water runs out. When flushing the system,ensure that
the water does not flow through the heat exchanger of the boiler, that
the thermostatic radiator valves are removed and the valve inserts are
set to the maximum flow rate.
If additives are used it is important to follow the instructions of the manu
facturer.
If, in a special case, it is necessary to use additives in a mixture (e.g.
hardness stabiliser, frost protection agent, sealing agent etc.) care must
be taken the agents are compatible with each other and the pH-value is
not altered. Preferably, agents from the same manufacturer should be
used.
For buffer storage tanks in combination with solar systems or solid fuel
boilers the buffer contents must be taken into consideration when deter
mining the fill water volume.
5.2.5 Diagram of water hardness
To avoid damage due to forming of boiler scale in the boiler the following
illustration has to be observed.
5 Before installation
7658013 - 02 - 15092016
Paramount four 30 – 115 kW
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