Connection To The Heat Pump; Filling The System - STIEBEL ELTRON HSBB 3 S Bedienung Und Installation

INSTALLATION
Installation
f Provide thermal insulation in accordance with applicable f
regulations.
Oxygen diffusion
Material losses
!
Avoid open heating systems and plastic pipes in under-
floor heating systems which are permeable to oxygen.
In underfloor heating systems with plastic pipes that are per-
meable to oxygen and in open vented heating systems, oxygen
diffusion may lead to corrosion on the steel components of the
heating system (e.g. on the indirect coil of the DHW cylinder, on
buffer cylinders, steel heating elements or steel pipes).
Material losses
!
The products of corrosion (e.g. rusty sludge) can settle in
the heating system components and can result in a lower
output or fault shutdowns due to reduced cross-sections.
Supply lines
The maximum permissible line length between the appliance and
the heat pump will vary, depending on the version of the heating
system (pressure drop).
f As a standard value, assume a maximum line length of 10 m f
and a pipe diameter of 22-28 mm.
f Protect the flow and return lines against frost with sufficient f
thermal insulation.
f Provide thermal insulation in accordance with applicable f
regulations.
f Only use weather-resistant cables. f
f Also protect all supply lines/cables against humidity, damage f
and UV radiation by means of a conduit.
Sample installation
2
1 Pipes carrying heating water
2 Pressure hoses
32 | HSBB 3

11.4 Connection to the heat pump

The appliance and the heat pump are connected to one anoth-
er hydraulically via pipes carrying heating water. To reduce the
transmission of structure-borne noise on the water side, connect
the appliance to the heat pump with pressure hoses (not required
for WPL 15-25 A).
f When sizing the pipes, take the following information into f
account:
Available pressure differential
If you exceed the permissible value, the pressure drop in the heat-
ing system could result in a reduced heating output.
f When sizing the pipes, ensure that the available external f
pressure differential is not exceeded (see chapter "Specifica-
tion / Data table").
f When calculating the pressure drop, take account of the flow f
and return lines and the pressure drop of the heat pump.
The pressure drop must be covered by the available pressure
differential.

11.5 Filling the system

Water quality
Carry out a fill water analysis before the system is filled. This
analysis may, for example, be requested from the relevant water
supply utility.
To avoid damage as a result of scaling, it may be necessary to
soften or desalinate the fill water. Always observe the fill water
limits specified in chapter "Specification / Data table".
f Recheck these limits 8-12 weeks after commissioning and f
during the annual system service.
Note
To prevent corrosion, desalinate water with conductivity
>1000 μS/cm before use.
1
Note
If you treat the fill water with inhibitors or additives, the
same limits as for desalination apply.
Note
Suitable appliances for water softening, as well as for
filling and flushing heating systems, can be obtained from
trade suppliers.
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