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Requirements for water quality
The hot water tank in the Nilan units is made of steel, which has been given a double enamelling, to ensure an extra long service life. In
addition, the tank is equipped with a sacrificial anode as extra protection. It is important that the sacrificial anode is replaced regularly.
Most units are equipped with an electronic monitoring sacrificial anode, which gives an alarm on the user panel when it is time to
replace it.
In order for the sacrificial anode to function and protect the tank, it is required that the water quality complies with the following:
• Electrical conductivity (EC): Between 30 mS/m and 150 mS/m (millisiemens pr. m) @ 25 °C
• Chloride must be below 250 mg/L @ 65 °C
If the above criteria are not met, the sacrificial anode will not work as intended, after which the tank will be corroded., to
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.
Softened water
If it is wished to soften water with salt in a Nilan hot water tank, the following must be observed:
• The conductivity must be between 30 mS/m og 150 mS/m (millisiemens per m)
• The chlorine content must be under 250 mg Cl/l
If the above criteria are exceeded, the anode current will be too high, the anode will break down too quickly and the water will begin to
smell bad.
ATTENTION
Hot water circulation can lead to a significant heat loss in the pipes, diverting a good proportion of the heat pump's
output. 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 protection on the hot water outlet.
CAUTION
De-mineralised water (double ion exchange) must not be used, as the tank will quickly corrode. De-mineralised is also
referred to as desalinated and de-ionised water.
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