53
PIPING AND WIRING FOR INDOOR UNIT
ENGLISH
NOTE
!
• To secure enough water flow rate, do not set water pump capacity as Minimum.
It can lead unexpected flow rate error CH14.
Water Quality
Water quality should be complied with EN 98/83 EC Directives.
Detailed water quality condition can be found in EN 98/83 EC Directives.
• 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.
CAUTION
!
Water contents Value
pH 7.5~9.0
Conductivity 10~500 uS/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 °C 3 000 180
40 °C 500 50
60 °C 200 30
80 °C 125 20
pH9
15 °C 18 000 700
40 °C 2 600 250
60 °C 1 000 170
80 °C 550 130
Water pump Capacity
The water pump us variable type which is capable to change flow rate, so it may be required to
change default water pump capacity in case of noise by water flow. In most case, however, it is
strongly recommended to set capacity as Maximum.
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