Potterton SIRIUS FS Installation & Servicing Instructions Manual page 19

4.4.2 Connection into new Heating Systems.
It is recommended to thoroughly clean out the new system with a system flush product,
before commissioning the boiler.
Whether connecting to an existing or a new heating system, a filter/strainer with
a size of 100 microns (with two isolation valves) must be fitted in the return pipe.
During routine maintenance and service visits it can be removed and cleaned, which
will help protect the boiler from contaminants, inside the heating system.
4.4.3 Water Quality and System Inhibitors
It is essential, for the long life of the boiler that the following water quality limits are not
exceeded:-
If the system contains aluminium parts, the pH level must be less than 8.5. The pH
value inside the system should only be measured after a steady state has been
achieved (i.e. all filling and bleeding operations have been completed)
Chloride values of the system water and the supply water should be compared at
regular intervals. If the Chloride value of the system water is considerably higher
than the supply value, this would indicate that there is system leakage and water is
being lost to evaporation. This will result in Chloride concentration and premature
boiler failure if left untreated. If Chloride concentration levels have exceeded
200mg/l, the system should be flushed clean and refilled with low Chloride water
and appropriate system treatments.
After cleaning and flushing of the system, it should be filled with an appropriate inhibitor
or antifreeze treatment to maintain water quality levels. The following system treatments
have been tested and are recommended for use in this boiler:
Inhibitors
Noise reducer
Universal cleaner
Sludge remover
Antifreeze
If a mixture of additives is required in the same system (e.g. sludge remover and inhibitor) it
is recommended that the same manufacturer of additive be used.
Sirius FS
Water Hardness
Chloride levels
pH levels
FERNOX
Protector/Alphi 11
Restorer
Protector, Restorer
Alphi 11
17
<250ppm
<200mg/l
7.5 to 9.5
SENTINEL
X100, X500
X200
X300
X400
X500
GB/IE