5.3.3 Water quality
! CAUTION
• Water quality must be according to EU council directive 98/83 EC.
• Water should be subjected to ltration or to a softening treatment with chemicals before application as treated water.
• It is also necessary to analyse the quality of water by checking pH, electrical conductivity, ammonia ion content, sulphur content, and others. Should
the results of the analysis be not good, the use of industrial water would be recommended.
• No antifreeze agent shall be added to the water circuit.
• To avoid deposits of scale on the heat exchangers surface it is mandatory to ensure a high water quality with low levels of CaCO
3
.
Recommendations for the DHW circuit
The following is the recommended standard water quality.
Item
DHW space Tendency
(1)
Water supplied
(3)
Corrosion Deposits of scales
Electrical Conductivity (mS/m) (25°C)
{µS/cm} (25 °C)
(2)
100~2000
Chlorine Ion (mg CI¯/I) max 250
Sulphate (mg/l) max 250
Combination of chloride and sulphate (mg/l) max 300
Total Hardness (mg CaCO
3
/I) 60~150
? NOTE
• (1): The mark “ ” in the table means the factor concerned with the tendency of corrosion or deposits of scales.
• (2): The value shown in “{}” are for reference only according to the former unit.
• (3): Water range will be according s/UNE 112076:2004 IN.
5.3.4 Water ow control
YUTAKI pumps can estimate the water ow by electronic calculation. Therefore, there is no need to install a water ow switch with
the new YUTAKI pumps.
However, if a secondary pump is installed or glycol is used (in the case of YUTAKI M), it is necessary to install a water ow control,
as the electronic calculation may be affected.
REFRIGERANT AND WATER PIPING
PMML0510 rev.1 - 10/2019
44
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