Hot water circulation
If wished, hot water circulation can be established by fitting a non-return valve and a circulation pump
for domestic water to the tank's circulation connector.
If hot water circulation is not established, the connector must remain closed with the factory-mounted
shut-off plug.
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.
Solar coil
All VP18 SOL models have an integral supply heat exchanger. See connections overview.
The supply heat exchanger has a surface area of 0.6 m
2
and is intended for solar heating systems.
However, it can also be connected to other heat sources.
ATTENTION
If you connect a solar panel or another heat source to VP18, it is recommended that you also
connect a safety group to the hot water outlet to avoid scalding.
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.
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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