4.1 Water quality
Water quality should be complied with EN 98/83 EC Directives.
<!> IMPORTANT
• If the product is installed at existing hydraulic water loop, it is important to clean hydraulic pipes to remove sludge and scale.
• Installing sludge strainer in the water loop is very important to prevent performance degrade.
• Chemical treatment to prevent rust should be performed by installer.
• It is strongly recommended to install an additional filter on the heating water circuit. Especially to remove metallic particles
from the heating piping, it is advised to use a magnetic or cyclone filter, which can remove small particles. Small particles
may damage the unit and will NOT be removed by the standard filter of the heat pump system.
• Water quality check should be implemented before completing the installation of system. Detailed guide can be found in the
table as below.
Water Contents Value
pH 7.5 ~ 9.0
Conductivity 10 ~ 500 μS/cm
TDS ( Total dissolved solids ) 8 ~ 400 ppm
Alkalinity ( HCO
3
-
)
60 ~ 300 (mg/L)
Total hardness
4 ~ 8.5 ˚dH
71.4 ~ 151.7 (mg/L)
Iron (Fe) ≤ 0.2 (mg/L)
Sulphate ( SO
4
2-
)
≤ 100 (mg/L)
Nitrite ( NO
3
-
)
≤ 100 (mg/L)
Free chlorine ( Cl
2
)
≤ 1 (mg/L)
Chlorides ( Cl
-
)
ppm STS316 STS304
pH7
15℃ 3,000 180
40℃ 500 50
60℃ 200 30
80℃ 125 20
pH9
15℃ 18,000 700
40℃ 2,600 250
60℃ 1,000 170
80℃ 550 130
Installation of Outdoor Unit
4. Water Control
Installation
6
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