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42 Appendix
5 Appendix
5.1 Inlet water quality requirements
Cond air Plc recommends that the Condair ME must be connected to a clean, wholesome (drinking
water quality) mains water supply. For areas of hard water and to minimise scale build up the water
supply may be treated by a reverse osmosis system (RO).
Reverse Osmosis
For Condair ME systems supplied with RO water it is recommended that the system is operated within
the following parameters. The use of RO water fed tanks and reservoirs is only permitted as part of a
managed and hygiene monitored water system and should form part of the water system risk assessment.
System Conductivity
Condair ME Control > 5 μS cm-1 at 20 °C (68 °F)
Other Water Supplies
There is a growing demand to utilise sustainable water sources to help overcome scarcity challenges
and recycle water. It is possible to use high-quality, treated efuent for non-wholesome applications.
The following gives guidance on reclaimed water quality that may be acceptable for use within the Con-
dair ME. “Efuent treated water”, must be treated by an appropriate water treatment method and risk
assessed to ensure it is safe and suitable for use in the Condair ME unit. It is the responsibility of the
user to ensure that the water supply system is part of a managed, hygiene monitored water system, risk
assessed and complies with the local regulations and bylaws.
Below are example water conditions that would allow a Condair ME to operate within specication.
Parameter Content in supply water Concern
Temperature < 20 °C (68 °F) Warm water favours growth of bacteria
Aluminium - No specic concerns
Ammonium < 0.50 mg/l Odour passed to air
Calcium < 300 mg/l Scale formation
Chloride < 300 mg/l Corrosion of stainless steel
Colour None Not directly a concern
Copper < 1 mg/l Deposits and corrosion stimulation
Conductivity < 650 μS cm-1 at 20°C (68 °F) Total hardness and scale formation.
pH 6.5 to 9.5 Acid or Alkali damage to equipment.
Iron < 0.5 mg/l
Deposit formation on oxidation and a critical support
role in Legionella growth.
Manganese < 0.1 mg/l Deposit formation
Nitrate - No specic concerns
Nitrite - No specic concerns
Odour Acceptable to users Smell passed to air
Sulphate < 250 mg/l No specic comments
42


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