Caution The electrical installation must be carried out using permanently rout-
ed cables and must follow applicable local and national regulations. It
must be possible to isolate the power supply using an all-pole circuit
breaker with a minimum contact gap of 3 mm.
2.4 Water quality
Caution A normal heating system always contains a certain amount of corro-
sion particulates (rust) and sludge products from calcium oxide. This
comes from acid that is naturally occurring in the fresh water that the
system is filled with. It is not good practice to have to fill the heating
system regularly which is why any leakage in the heating system
should be repaired immediately. Normal filling should occur only once
or twice a year. The water in the heating system should be as clean as
possible, always position the dirt filter on the return line from the heat-
ing system to the heat pump, as close to the heat pump as possible.
Caution Hard water; Normally it is not a problem installing a heat pump in
areas with hard water because the normal operating temperature for
the hot water does not exceed 60°C. In areas where there are excep-
tional prevailing conditions with the water one can install a softening
filter, which softens the water, cleans any impurities and prevents the
build up of calcification.
2.5 Commissioning
Caution The installation may only be commissioned if the heating system and
brine system have been filled and bled. Otherwise the circulation
pumps can be damaged.
Caution If the installation is only to be driven by the immersion heater during
the installation, ensure that the heating system is filled and the brine
pump and compressor cannot be started.
Commissioning DHP-H Varius Pro+/DHP-L Varius Pro+
Danfoss Heating Solutions VIJSG202
9
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