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PMML0600 rev.0 - 06/2022
5
SPACE HEATING AND DHW FOR YUTAKI M / YUTAKI HYDROSPLIT
DRAIN AND WATER PIPING
Nitrate < 100 mg/l (NO
)
Iron < 0.2 mg/l (Fe)
TDS (Total dissolved solids) 8 ~ 400 ppm
Appearance of the water Clear and without deposits -
◆ Additional DHW Circuit recommendation
In places where possible hard water areas, to prevent and minims scale situations, it is
recommended to reduce stored water temperature to a maximum of 55ºC, as huge scale quantity
could damage the water tank and the electrical heater.
Flush the domestic water circuit with at least 10 times its volume of water. The life of the water
tank will be shorter if groundwater (spring water, well water, etc..) is used without treatment
which can lead to the corrosion of the tank. The water must not be aggressive or encrusting at
any time. The result of calculating the Langelier Index should be between +/- 0.5.
In installation locations where the result of Langelier Index calculation are out of the expected
value with a tendency to corrosive water, it is recommended to install the active anode accessory
(ATW-CP-05 only available for YUTAKI H Combi version).
In the regions where the water is very hard (or out of requirements values) or where the result
of Langelier Index calculation are out of expected value with a tendency to hard water, it is
recommended tting a soener system. Please ensure that soener system will be capable of
providing eective protection against corrosion. It is recommended to install the active anode
accessory (ATW-CP-05 only available for YUTAKI H Combi version).
As DHW Tank water is being used for storing drinking water, this water has to be in accordance
with national regulations and Hitachi’s quality minimum requirements. The use of soeners,
active anodes or others protective systems will not bring a derogation from Hitachi’s provided
warranty.
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