INSTaLLaTION
appliance installation
www.stiebel-eltron.com
WPL 15 IKS | WPL 25 IK |
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10.6 Heating water connection
The heating system to which the heat pump is connected must be
installed by a qualified contractor in accordance with the water
installation drawings that are part of the technical guides.
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Thoroughly flush the pipework before connecting the heat
pump. Debris, such as rust, sand and sealant, can impair the
operational reliability of the heat pump.
To facilitate the connection to the heating system, push-fit connec-
tors are enclosed with the appliance (see chapter „Fitting the
push-fit connectors“).
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For each of the „heating flow“ and „heating return“ connec-
tions, connect one of the flexible pressure hoses to act as an
anti-vibration mount.
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Connect the heating system to the „heating flow“ and „he-
ating return“ connections of the internal unit. Check for
tightness.
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Ensure the correct connection of the heating flow and return.
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Provide thermal insulation in accordance with applicable
regulations.
Safety valve
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1 Drain
2 Discharge outlet
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Size the discharge outlet so that water can drain off unimpe-
ded when the safety valve is fully opened.
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Ensure that the safety valve drain is open to the outside.
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Install the safety valve drain with a constant fall to the
discharge outlet. When installing the drain, never kink the
pipe.
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).
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With heating systems that are permeable to oxygen, separate
the heating system between the heating circuit and the buf-
fer cylinder.
!
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.
Water quality
A fill water analysis must be available prior to charging the sys-
tem. This may, for example, be requested from the relevant water
supply utility.
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Material damage
To avoid damage as a result of scaling, it may be neces-
sary to soften or desalinate the fill water. The fill water
limits specified in chapter „Specification / data table“
must always be observed.
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Recheck these limits 8-12 weeks after commissio-
ning and as part of annual system maintenance.
Note
With conductivity of >1000 μS/cm, water treatment by
desalination is recommended in order to avoid corrosion.
Note
Suitable appliances for water softening and desalinating,
as well as for charging and flushing heating systems, can
be obtained via trade suppliers.
Note
If you treat the fill water with inhibitors or additives, the
same limits as for desalination apply.
