Danfoss DHP-AT, Installation Manual

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6 Piping installation
6.1 Pipe connection
Caution There is a risk that the pipes to the heat pump freezes when water circulation through the heat pump stops
and the outdoor temperatures drops below freezing. The integrated flow sensor will normally give an alarm if
the water flow is low (provided that the heat pump is powered on), 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 system is powered
OFF, there is an obvious risk of freezing.
Installing a drain plug indoors will make it possible to drain the part of the system that goes out to the heat
pump if necessary.
Another way to prevent freezing is to install an intermediate exchanger indoors. In such cases glycol intended
for refrigerant applications must be used in the circuit to the heat pump unit and an extra circulation pump is
required, see System solution intermediate exchanger. Another option is to fill the heating system with anti-
freeze fluid.
Caution
To prevent leaks, ensure that there are no stresses in the connecting pipes!
Caution
It is important that the excessive air is bled from the heating system 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 safe-
ty valves.
Caution Cold and hot water pipes and overflow pipes from safety valves must be made of heat resistant and corro-
sion-resistant material, for example copper. The safety valve overflow pipes must have an open connection to
a drain in a frost-free environment.
Caution
The connecting pipe between the expansion tank and the safety valve must slope continuously upwards. This
means that the pipe must not, at any point, slope downwards
N
The pipe installation must be carried out in accordance with the dimensions and connection diagrams.
Caution
Safety valves must be installed in the system for both the heating circuits and DHW, according to local regula-
tions.
6.2 Connecting cold and hot water lines
If necessary, connect the cold water (9) and hot water (10) pipes with all the necessary components to the hot water tank, see the system
solution illustration.
Installation Guide DHP-AT
VMGFI302 Danfoss Heating Solutions
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