iNSTaLLaTiON
installation
www.stiebel-eltron.com
WPL E | WPL cool |
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26
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3
01
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94
7
1
2
1 Connector
2 Union nut
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Loosen the union nut.
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Rotate the connector.
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Retighten the union nut.
26
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01
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17
3
1
1 Pipe bend for heating circuit return
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Fit the "heating circuit return" pipe bend.
10.3 Heating water connection
!
Material losses
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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Before connecting the heat pump, flush the pipework thor-
oughly with suitable water. Foreign bodies, such as rust,
sand or sealant can impair the operational reliability of the
heat pump.
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Connect the heat pump on the heating water side. Check for
tightness.
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Connect the flexible pressure hoses to the connectors. The
pressure hoses must be at least 1 metre long.
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Ensure that the heating flow and return are connected
correctly.
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Provide thermal insulation in accordance with applicable
regulations.
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When sizing the heating circuit, observe the internal pressure
differential (see chapter "Specification / Data table").
Structure-borne noise is largely prevented by the anti-vibration
construction of the heat pump and by the flexible pressure hoses,
which act as anti-vibration mounts.
10.3.1 Oxygen diffusion
!
Material losses
Avoid open vented heating systems and underfloor heat-
ing systems with plastic pipes 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 radiators 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 buff-
er cylinder.
!
Material losses
The products of corrosion (e.g. rusty sludge) can set-
tle in the heating system components, which may re-
sult in a lower output or fault shutdowns due to reduced
cross-sections.
10.4 Second heat source
For dual mode systems, always connect the heat pump into the
return of the second external heat source, e.g. oil boiler.
