www.stiebel-eltron.com WPL basic | WPL S basic | 11
INSTALLATION
Mounting
2
3
4
1
26�03�01�0170
6
5
1 Appliance power cable
2 Electric booster heater power cable
3 Control cable
4 BUS cable
5 Heating flow
6 Heating return
Position the cover on the appliance, and secure it with two
screws.
Cut the pipe outlets for the water pipes out of the cover.
Route the water pipes through the cover into the appliance.
Then route the cables from above through the cable entries
with strain relief fittings (PG fittings) into the appliance.
The open PG fittings are intended for the following: Appli-
ance power supply, control cable and BUS cable.
10.2.3 External installation
Observe the air discharge direction.
Position the standard appliance on the prepared substrate.
1
234
26�03�01�1644�
1 Condensate hose
2 Supply line outlet
3 Pipe bend, heating circuit flow
4 Pipe bend, heating circuit return
Fit the pipe bends for the heating circuit flow and return
(part of the “External installation accessories”).
Route the water pipes and the cables from below through the
cut-out in the floor into the appliance.
!
Material losses
Rodents may get into the appliance through the knock-
out aperture.
Close off the knock-out aperture.
10.3 Heating water connection
The heating system to which the heat pump is to be connected
must be installed by a qualified contractor in accordance with the
water installation drawings that are part of the technical docu-
ments.
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.
Connect the heat pump on the heating water side. Check for
tightness.
Connect flexible pressure hoses to the connectors; these will
act as anti-vibration dampers.
The pressure hoses should be at least 1 m long.
10.3.1 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.
10.3.2 Filling the heating system
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.
!
Material losses
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.
Recheck these limits 8-12 weeks after commission-
ing and as part of annual system maintenance.
Note
With conductivity of >1000μS/cm, desalination treatment
is recommended in order to avoid corrosion.
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