13
2551988C
Water treatment
The quality and cleanliness of the water within both the primary and secondary circuits is vitally
important, to prevent damage to the ModuSat components and to ensure that the efficiency and
service life of the unit is maintained.
It is therefore necessary to fully flush and treat both primary and secondary circuits using suitable
water treatment chemicals.
Water treatment in accordance to these instructions.
Please confirm with the water treatment consultants that the chemicals used and
cleaning method statement complies with the requirements set out in this
section.
Water quality may damage the unit.
Poor water quality may damage the components used in the unit and invalidate
the warranty. The manufacturer cannot take responsibility for any damage of the
unit caused by poor water quality.
Chemical cleaning and dosing.
Chemical cleaning and dosing of the system should be in line with the current
regulations, standards and guidelines. Which are, but are not limited to:
BSRIA Application Guide BG29/2012
BS7593:2006
Requirements of Thames Water Utilities
The Water Industry Act 1991, Section 119
HSE The Control of Legionellosis 1991
HSC Approved Code of Practice and Guidance HSG274, Part 2
Water Quality Guidelines
TH - Total hardness is caused by calcium
and magnesium.
pH – this measures the alkalinity of the
water, neutral alkalinity is pH7. Heating
systems require an alkaline pH. Lower
pH will increase the corrosion risk.
TDS – . dissolved solids in the system
and is a measure of the cleanliness of
the water. (satisfactory level should be
within TDS of 10% of the mains water) .
Conductivity – this is the measure of the
ability of water to pass an electrical
current.
Free copper – the level of copper in the
system.
Total Iron and Manganese – this
measures iron concentration in mg/litre.
These are strong oxidants and may
increase the risk for corrosion.
Recommended
Hardness (TH)
Up to 150 mg/l (as CaCO
3
)
Chlorides (Cl
-
)
Up to 150 mg/l
PH
7.5 – 9.0
Resistivity
> 2000 Ohm/cm
Sulphate (SO
4
2-
)
Up to 70 mg/l
Conductivity
200 crs
TDS
0-200 ppm
Free carbon dioxide
(CO
2
)
Up to 5 mg/l
Manganese (Mn)
Up to 0.1 mg/l
Iron (Fe)
Up to 0.2 mg/l (or 5ppm)
Copper
Up to 1 mg/l
Typical Water Quality Guidelines
