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Aquarea air / water heat pump – design handbook 07 / 2014
Project Design
Hydraulics
Hydraulic integration
Prior to connecting the return pipe to the heat pump, an in-line filter/
strainer must be installed on the building side to protect the heat pump.
The mesh size of the in-line filter/strainer must be minimum 500 to
600
µ
m (micron), whereby the pressure loss though the installation
of the dirt filter may not impair the operation of the heat pump. Failure
to fit an in-line filter on install will invalidate the warranty, as well as
cause permanent damage to the heat pump unit.
A magnetic particle filter is also recommended to be fitted to the system
but is not a mandatory requirement, BUT a magnetic particle filer is not
to be fitted in place of an inline filter only in addition to one.
Depending on the nominal heating capacity of the heat pump system
the following total water volume in the system must be available:
Nominal heating capacity up to incl. 9 kW:
30 litres
Nominal heating capacity 12 kW up to incl. 16 kW: 50 litres
In-line Filter/Strainer
Note
If the total water volume in the system is lower than the specified values,
the system water volume must be increased using a buffer tank or an
additional vessel.
System volume
Magnetic Particle Filter
Both types of control reduce the pump speed when the differential pressure
or resistance in the heating circuit increases. As a result, the volume cir-
culation decreases to a far greater extent than with unregulated standard
pumps, and can cause the volume flow to drop below the minimum (see
technical data) and thus to a fault.
As an alternative to hydraulic decoupling via a hydraulic switch or a
buffer tank, it can be implemented via a bypass using multiple non-
restrictable or permanently open heating circuits.
Rooms with continuous high heating requirements such as bathrooms
are suitable for this. When using this option, you must also ensure that
the minimum volume flow of the heat pump is always guaranteed.
Attention
In contrast to standard pumps and pumps without differential pressure
control, a hydraulic decoupling must be established between the heat
pump circuit and heat consumer circuit when using Aquarea heat
pumps with high-efficiency pumps – auto-bypass valves cannot be used.