6 Piping installation
6.1
Pipe connection
Caution! Piping installation must be carried out in accordance with applicable local rules and regulations.
The hot water tank must be equipped with an approved safety valve.
Caution! There is a risk of the pipes to the heat pump freezing when water circulation through the heat
pump stops when outdoor temperatures fall below freezing. Normally the integrated flow sensor gives an
alarm if there is low flow (assumes that there is current to the heat pump), for example when the radiator
pump has stopped. In the event of longer flow stops, for example in case of power failure or if the plant is
OFF, there is however an obvious risk of freezing . By installing a stop cock on the inside of the house wall
it is possible to drain the part of the system that goes out to the heat pump if necessary. Another way of
ensuring against freezing is to install an intermediate exchanger indoors. In such cases one must use
glycol intended for refrigerant applications in the circuit to the heat pump unit and an extra circulation
pump, see System solution intermediate exchanger. Another option is to fill the heating system with anti-
freeze.
Caution! To prevent leaks, ensure that there are no stresses in the connecting pipes!
Caution! It is important that the heating system is bled after installation. Bleed valves must be installed
where necessary.
Caution! Heating systems with closed expansion tanks must also be supplied with approved pressure
gauges and safety valves.
Caution! Cold and hot water pipes and overflow pipes from safety valves must be made of heat resistant
and corrosion-resistant material, e.g. copper. The safety valve overflow pipes must have an open
connection to the drain and visibly flow into this in a frost-free environment.
Caution! The connecting pipe between the expansion tank and the safety valve must slope continuously
upwards. A continuous upwards slope means that the pipe must not slope downwards from the
horizontal at any point.
Note! Ensure that the pipe installation is carried out in accordance with the dimensions and connection
diagrams.
6.2 Connecting cold and hot water lines
If necessary, connect the cold water and hot water pipes with all the necessary components, see System solution,
Page 24.
6.3 Connecting the heating system supply and return lines
Connecting the heating system supply and return lines, see System solution, Page 24.
For information on how flexible hoses should be installed, see Flexible hoses, Page 30.
Installation instructions VMGFD102 – 29
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