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Requirements to quality of water
In order for at hot water tank in stainless steel to last for many years, it is required that the water quality must comply with the
following cirteria:
• Electrical conductivity: < 125 mS/m (millisiemens per. m) @ 25 °C
• Saturation index (LSI): > -1,0 / < 0,8 @ 80 °C
• pH level: > 6,0 / < 8,5
• Chloride: < 250 mg/L @ 65 °C
If the above criteria are not met, the tank wil be corroded.
Hot water circulation
Hot water circulation can be established by fitting a non-return valve and a circulation pump for domestic water to the tank's circula-
tion connector.
If hot water circulation is not established, the connector must remain closed with the factory-mounted shut-off plug.
Supplementary coil
All units ordered as a SOL models have integral supplementary coil, see connections list.
The supplemental coil is intended for solar heating systems, though it can also be connected to other heat sources, e.g. a heat pump.
ATTENTION
Hot water circulation can lead to a significant heat loss in the pipes, diverting a good proportion of the heat pump's out-
put. To avoid this, circulation pipes and the hot water loop must be insulated with at least 30 mm mineral wool.
It is advisable to set a timer so that the circulation pump is not running constantly.
ATTENTION
If a solar collector or other heat source is connected to the supplementary coil, it is recommended to install a scald pro-
tection on the hot water outlet.
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