STIEBEL ELTRON WPL E Series User manual

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CONTENTS
SPECIAL INFORMATION
OPERATION
1. General information �����������������������������������������3
1.1 Relevant documents_____________________________________________ 3
1.2 Safety instructions_______________________________________________ 3
1.3 Other symbols in this documentation _______________________ 4
1.4 Units of measurement __________________________________________ 4
1.5 Standardised output data______________________________________ 4
2. Safety����������������������������������������������������������4
2.1 Intended use______________________________________________________ 4
2.2 Safety instructions_______________________________________________ 4
2.3 Test symbols ______________________________________________________ 4
3. Appliance description ���������������������������������������5
3.1 Function ___________________________________________________________ 5
4. Settings �������������������������������������������������������5
5. Maintenance and care ���������������������������������������5
6. Troubleshooting ����������������������������������������������6
INSTALLATION
7. Safety����������������������������������������������������������7
7.1 General safety instructions ____________________________________ 7
7.2 Instructions, standards and regulations ____________________ 7
7.3 Operation of the appliance in buildings with
combustion equipment _________________________________________ 7
8. Appliance description ���������������������������������������7
8.1 Standard delivery________________________________________________ 7
8.2 Required accessories ___________________________________________ 7
8.3 Additional accessories __________________________________________ 7
9. Preparations ��������������������������������������������������8
9.1 Sound emissions_________________________________________________ 8
9.2 Minimum clearances____________________________________________ 8
9.3 Preparation of the installation site___________________________ 9
9.4 Electrical installation___________________________________________ 10
9.5 Buffer cylinder __________________________________________________ 11
10. Installation�������������������������������������������������� 11
10.1 Transport _________________________________________________________ 11
10.2 Siting and connecting the appliance________________________ 11
10.3 Heating water connection_____________________________________ 13
10.4 Second heat source_____________________________________________ 13
10.5 Filling the heating system ____________________________________ 14
10.6 Minimum flow rate _____________________________________________ 14
10.7 Condensate drain _______________________________________________ 15
10.8 Checking the draining of condensate_______________________ 16
10.9 High limit safety cut-out for underfloor heating
systems ___________________________________________________________ 16
11. Power supply ����������������������������������������������� 16
11.1 Control panel ____________________________________________________ 16
12. Fitting casing components �������������������������������� 18
12.1 Outdoor installation____________________________________________ 18
12.2 Indoor installation______________________________________________ 19
13. Commissioning ��������������������������������������������� 21
13.1 Check before commissioning the heat pump manager _ 21
13.2 Commissioning the heat pump manager __________________ 22
13.3 Initial start-up___________________________________________________ 22
13.4 Settings ___________________________________________________________ 23
14. Appliance shutdown ��������������������������������������� 23
14.1 Standby mode ___________________________________________________ 23
14.2 Power interruption _____________________________________________ 23
15. Appliance handover���������������������������������������� 24
16. Troubleshooting �������������������������������������������� 24
16.1 Controls on the IWS ____________________________________________ 24
16.2 Resetting the high limit safety cut-out _____________________ 24
16.3 Fan noise _________________________________________________________ 25
17. Maintenance ������������������������������������������������ 25
17.1 Clean condensate pan and drain ____________________________ 25
18. Specification ������������������������������������������������ 26
18.1 Dimensions and connections ________________________________ 26
18.2 Wiring diagram _________________________________________________ 28
18.3 Output diagrams ________________________________________________ 30
18.4 Data table ________________________________________________________ 36
GUARANTEE
ENVIRONMENT AND RECYCLING

SPECIAL INFORMATION
General information
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SPECIAL INFORMATION
- The appliance may be used by children aged8
and older and persons with reduced physical,
sensory or mental capabilities or a lack of ex-
perience and know-how, provided that they are
supervised or they have been instructed on how
to use the appliance safely and have understood
the potential risks. Children must never play with
the appliance. Children must never clean the ap-
pliance or perform user maintenance unless they
are supervised.
- The connection to the power supply must be in
the form of a permanent connection. Ensure the
appliance can be separated from the power sup-
ply by an isolator that disconnects all poles with
at least 3mm contact separation.
- Maintain the minimum clearances to ensure trou-
ble-free operation of the appliance and facilitate
maintenance work.
- Maintenance work, such as checking the electri-
cal safety, must only be carried out by a qualified
contractor.
- We recommend an annual inspection (to establish
the current condition of the system), and main-
tenance by a qualified contractor if required (to
return the system to its original condition).
- Never interrupt the power supply, even outside
the heating season. The system's active frost pro-
tection is not guaranteed if the power supply is
interrupted.
- The heat pump manager automatically switches
the heat pump to summer or winter mode.
- If the heat pump is completely switched off and
there is a risk of frost, drain the system on the
water side.
OPERATION
1. General information
The chapters "Special information" and "Operation" are intended
for both users and qualified contractors.
The chapter "Installation" is intended for qualified contractors.
Note
Read these instructions carefully before using the appli-
ance and retain them for future reference.
Pass on the instructions to a new user if required.
1.1 Relevant documents
Operating and installation instructions for the WPM heat
pump manager
Operating and installation instructions for system
components
1.2 Safety instructions
1.2.1 Structure of safety instructions
!
KEYWORD Type of risk
Here, possible consequences are listed that may result
from failure to observe the safety instructions.
 Steps to prevent the risk are listed.
1.2.2 Symbols, type of risk
Symbol Type of risk
Injury
Electrocution
1.2.3 Keywords
KEYWORD Meaning
DANGER Failure to observe this information will result in serious
injury or death.
WARNING Failure to observe this information may result in serious
injury or death.
CAUTION Failure to observe this information may result in non-seri-
ous or minor injury.
!

OPERATION
Safety
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1.3 Other symbols in this documentation
Note
General information is identified by the adjacent symbol.
 Read these texts carefully.
Symbol Meaning
Material losses
(appliance damage, consequential losses and environmen-
tal pollution)
Appliance disposal
 This symbol indicates that you have to do something. The ac-
tion you need to take is described step by step.
1.4 Units of measurement
Note
All measurements are given in mm unless stated oth-
erwise.
1.5 Standardised output data
Information on determining and interpreting the specified stand-
ardised output data.
1.5.1 Standard: EN 14511
The output data specifically mentioned in text, diagrams and
technical datasheets has been calculated according to the test
conditions of the standard shown in the heading of this section.
Generally, these standardised test conditions will not fully meet
the conditions found at the installation site of the system user.
Depending on the chosen test method and the extent to which
this method deviates from the conditions defined in the norm
shown in the heading of this section, any deviations can have a
considerable impact.
Additional factors that have an influence on the test values are the
measuring equipment, the system configuration, the age of the
system and the flow rates.
A confirmation of the specified output data can only be obtained
if the test conducted for this purpose is also performed in ac-
cordance with the conditions defined in the norm shown in the
heading of this section.
2. Safety
2.1 Intended use
The WPLE appliance is designed for central heating within the
application limits given in the specification.
The WPLcool appliance is designed for central heating and cooling
within the application limits given in the specification.
The appliance is intended for domestic use. It can be used safely
by untrained persons. The appliance can also be used in non-do-
mestic environments, e.g. in small businesses, as long as it is
used in the same way.
Any other use beyond that described shall be deemed inappro-
priate. Observation of this document is also part of the correct
use of the unit.
2.2 Safety instructions
Observe the following safety instructions and regulations.
- Only qualified contractors are permitted to carry out electri-
cal work and the installation of the heating circuit.
- The qualified contractor is responsible for adherence
to all applicable regulations during installation and
commissioning.
- The appliance should only be operated once it is fully in-
stalled and all safety equipment has been fitted.
- Protect the appliance from dust and dirt during building
work.
!
WARNING Injury
The appliance may be used by children over 8years of
age and persons with reduced physical, sensory or men-
tal capabilities or a lack of experience and expertise,
provided that they are supervised or they have been
instructed on how to use the appliance safely and have
understood the potential risks. Children must never play
with the appliance. Children must never clean the ap-
pliance or perform user maintenance unless they are
supervised.
!
WARNING Injury
 For safety reasons, only operate the appliance with
the casing closed.
2.3 Test symbols
See type plate on the appliance.
!
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OPERATION
Appliance description
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3. Appliance description
The appliance is an air | water heat pump that oper-
ates as a heating heat pump. The appliance extracts heat
from the outdoor air at a low temperature level and trans-
fers it to the heating water at a higher temperature level.
The heating water can be heated up to a flow temperature of 60 °C.
With the appropriate accessories, this appliance may be installed
internally or externally.
The appliance is equipped with an electric emergency/booster
heater (DHC). If the dual mode point is undershot in mono mode
operation, the electric emergency/booster heater is activated to
safeguard heating operation and the provision of high DHW tem-
peratures. In such a case in mono energetic operation, the electric
emergency/booster heater is activated as a booster heater.
Additional features
- Suitable for underfloor and radiator heating systems
- Preferred for low temperature heating systems
- Still extracts heat from the outdoor air at – 20°C outside
temperature
- Corrosion-protected, external casing made from hot-dipped
galvanised sheet steel plus stove-enamelled finish
- Comprises all components and safety equipment required for
operation
- Filled with non-combustible safety refrigerant
Note
To control the heating system, you will need the WPM
heat pump manager.
3.1 Function
3.1.1 Heating
Heat is extracted from the outdoor air via the heat exchanger
(evaporator) on the air side. The refrigerant evaporates and is
compressed by a compressor. This process requires electrical
energy.
The refrigerant is then at a higher temperature level and transfers
the heat drawn from the air to the heating system via an additional
heat exchanger (condenser). The refrigerant then expands and the
cycle begins again.
At air temperatures below approx. 7°C, the humidity in the air
condenses as hoarfrost on the evaporator fins. This hoarfrost is
automatically defrosted. Water created by this defrosting process
collects in the defrost pan and is drained off via a hose.
During the defrost cycle, the fan is switched off and the heat pump
circuit is reversed. The heat required for defrosting is drawn from
the buffer cylinder. The heat pump automatically reverts to heating
mode at the end of the defrost cycle.
!
Material losses
In dual mode operation, return water from the second
heat generator may flow through the heat pump. Please
note that the return temperature must be no higher than
60 °C.
3.1.2 Cooling (WPLcool only)
!
Material losses
The heat pump is not suitable for continuous, year-round
cooling.
 Observe the application limits (see chapter "Specifi-
cation/ Data table").
Rooms are cooled by reversing the heat pump circuit. Heat is
extracted from the heating water and the evaporator transfers
this heat to the outdoor air.
Area cooling requires the installation of the FEK remote control
unit in a reference room to capture the relative humidity and the
room temperature as part of dew point monitoring.
Heat pump application limit
The heat pump is switched off if the outside temperature falls
below the selected lower application limit for cooling (LIMITCOOL-
ING parameter).
4. Settings
The appliance is controlled with the heat pump manager and re-
quires no special operation.
 Please observe the heat pump manager operating and instal-
lation instructions.
5. Maintenance and care
!
Material losses
Maintenance work, such as checking the electrical safety,
must only be carried out by a qualified contractor.
Note
 Keep the air discharge and intake apertures free
from snow and leaves.
A damp cloth is sufficient for cleaning all plastic and sheet metal
parts. Never use abrasive or corrosive cleaning agents.
 Protect the appliance from dust and dirt during building
work.
 Every month, check that the condensate drain is working
correctly (visual inspection). When doing so, check for water
collecting below or next to the appliance. For further infor-
mation, see chapter "Troubleshooting".
We recommend a regular inspection (to establish the current con-
dition of the system), and maintenance by a qualified contractor if
required (to return the system to its original condition).
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OPERATION
Troubleshooting
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6. Troubleshooting
Fault Cause Remedy
There is no hot
water or the
heating system
remains cold.
No power at the appli-
ance.
Check the fuses/MCBs in your
distribution board. Replace the
fuses/reset the MCBs if required.
Notify your qualified contractor if
the fuses/MCBs blow/trip again.
Water is leaking
from the appli-
ance.
The condensate drain
may be blocked.
Call your contractor to have the
condensate drain cleaned out.
Indoor installa-
tion: Condensate
is collecting on
the outside of the
appliance or on
the air hoses.
The drying out phase of
the building is not yet
complete.
This condensate should no
longer form on the appliance
after the house is approx.two
years old, providing the room is
sufficiently well ventilated and
dehumidified.
The relative humidity in
the air is high (≥60%).
A change in weather conditions
should no longer cause conden-
sation to form on the appliance.
The appliance is sited
in a damp room. Damp
rooms are those where
humidity in the air is
high. They may, for ex-
ample, be used for drying
laundry.
Ensure that the room is ade-
quately ventilated and dehumid-
ified. If necessary, hang your
laundry in a different room.
Use a vented tumble dryer.
Please note that condenser tum-
ble dryers do not reduce the level
of humidity in the air.
The air hoses are incor-
rectly fitted or poorly
sealed.
Cold air is escaping.
Check that the air hoses are
correctly fitted and sealed. If
necessary, contact your qualified
contractor.
Outdoor installa-
tion: Condensate
is collecting on
the outside of the
appliance.
The heat pump is extract-
ing heat from the outdoor
air to heat the building.
This can cause the hu-
midity in the outdoor air
to accumulate as dew or
frost on the cooled heat
pump casing. This is not
a defect.
Note
Even when the condensate is draining away correctly,
expect water to drip from the appliance onto the floor.
If you cannot remedy the fault, notify your qualified contractor.
To facilitate and speed up your enquiry, please provide the serial
number from the type plate (000000-0000-000000).
Sample type plate
Montageanweisung beachten! Dichtheit geprüft! Made in Germany
*xxxxxxxxxxxxxxxxxx*
26_03_01_1736
1
1 Number on the type plate
1(
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INSTALLATION
Safety
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INSTALLATION
7. Safety
Only a qualified contractor should carry out installation, commis-
sioning, maintenance and repair of the appliance.
7.1 General safety instructions
We guarantee trouble-free function and operational reliability only
if original accessories and spare parts intended for the appliance
are used.
7.2 Instructions, standards and regulations
Note
Observe all applicable national and regional regulations
and instructions.
7.3 Operation of the appliance in buildings with
combustion equipment
As the appliance can produce negative pressure in the installation
room, we recommend using a tightly sealing door between the
installation room and the living space for operation with com-
bustion equipment.
If, due to its use, the installation room is connected to the ex-
tract air system, you must also allow for a supply air valve in the
installation room in this particular case to prevent any further
increase in the negative pressure in the installation room. The
negative pressure created by the appliance in the installation room
is heavily influenced by the pressure drop in the outdoor air line.
For this reason, the outdoor air line in particular should be as
short as possible.
8. Appliance description
For outdoor installation the appliance offers additional frost pro-
tection of the heating water pipes. The integral frost protection
circuit starts the heating circulation pump in the heat pump circuit
automatically at +8°C condenser temperature, and in doing so
ensures circulation in all water-filled sections.
The heat pump starts automatically when the temperature in the
heat pump circuit drops below +5°C.
8.1 Standard delivery
The casing components for the appliance are delivered in a sep-
arate packing unit.
8.1.1 Standard appliance
- Type plate
8.1.2 Casing components – outdoor installation
- Hood – outdoor installation
- Front panel
- Back panel
- Pipe bend for heating circuit flow
- Pipe bend for heating circuit return
8.1.3 Casing components for indoor installation
- Cover - indoor installation
- Front panel
- Back panel
- Pipe bend for heating circuit return
8.2 Required accessories
8.2.1 Outdoor installation
- WPM3 heat pump manager
- Accessories – outdoor installation
- Pressure hoses SD25 or SD32
8.2.2 Indoor installation
- WPM3 heat pump manager
- Accessories – indoor installation
- Pressure hoses SD25 or SD32
8.2.3 Cooling
- Remote control for heating systems FEK
8.3 Additional accessories
8.3.1 Outdoor installation
- Remote control for FE7 heating systems
- Water softening fitting HZEA
- SP cool distributor strip
- Internet Service Gateway ISG
8.3.2 Indoor installation
- Air hose DN 560 x 4 m
- Hose connection panel 560
- Wall outlet AWG 560 H-SR
- Wall outlet AWG 560 H-GL
- Wall outlet AWG 560 V-SR
- Wall outlet AWG 560 V-GL
- Wall outlet AWG 560 L
- Wall outlet AWG 600 L
- Remote control for FE7 heating systems
- Condensate pump PK 10
- Water softening fitting HZEA
- SP cool distributor strip
- Internet Service Gateway ISG

INSTALLATION
Preparations
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9. Preparations
9.1 Sound emissions
The appliance is louder on the air intake and air discharge sides
than on the two enclosed sides. Take the following information
into account when selecting the installation location.
Note
For details regarding the sound power level, see chapter
"Specification / Data table".
9.1.1 Sound emissions for outdoor installation
- Lawn areas and shrubs help reduce the spread of noise.
- Noise propagation can also be reduced through dense pali-
sades or similar.
 Ensure that the entire appliance frame is in full contact
with the substrate. Uneven substrates can increase sound
emissions.
 Ensure that the air intake direction is the same as the dom-
inant wind direction. Air should not be drawn in against the
wind.
 Ensure that the air intake and air discharge are never direct-
ed towards noise-sensitive rooms of the house, e.g. bed-
rooms, or neighbouring houses.
 Avoid installation on large, echoing floor areas, e.g. tiled
floors.
 Avoid installation between reflective building walls. Reflect-
ing building walls can increase the noise level.
9.1.2 Sound emissions for indoor installation
- Never install on joists.
 Ensure that the entire appliance frame is in full contact
with the substrate. Uneven substrates can increase sound
emissions.
 Never install the appliance directly below or next to a living
room or bedroom.
 Never direct the air intake and discharge apertures in exter-
nal walls towards neighbouring windows or living rooms/
bedrooms.
 Protect pipe outlets through walls and ceilings with anti-vi-
bration insulation.
9.2 Minimum clearances
9.2.1 Outdoor installation
≥500 ≥1000
≥500 ≥2000
≥700
D0000019241
 Maintain the minimum clearances to ensure trouble-free op-
eration of the appliance and facilitate maintenance work.
91_00_00_0036
 Never install the appliance in a recess. Two sides of the ap-
pliance must remain exposed.
 In order to prevent air "short circuits", maintain the minimum
clearances in the case of surrounding structures and in par-
ticular in the case of cascades. Maintain the flow rate on the
heat source side (see chapter "Specification / data table").
!
Material losses
Please note that both the flow of outdoor air into the
appliance, and the flow of exhaust air from the appliance
must be unimpeded.
If the air intake and discharge of the appliance are ob-
structed by surrounding objects, this may cause a thermal
short-circuit.
 Ensure that the appliance is not fully enclosed by objects
such as buildings, walls or fences.
If the air discharge side of the appliance faces the wall of a house,
the cool air from the air discharge may cause condensate to form
on this wall.
!
Material losses
The air flow rate through the appliance must not fall
below the minimum level. If the air flow rate falls below
the minimum level, trouble-free operation of the appli-
ance is not guaranteed.
 Ensure that the minimum air flow rate is maintained
(see chapter “Specification/ Data table”).
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INSTALLATION
Preparations
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9.2.2 Indoor installation
≥500
≥300
≥500
≥500
≥1000
D0000019242
 Maintain the minimum clearances to ensure trouble-free op-
eration of the appliance and facilitate maintenance work.
9.3 Preparation of the installation site
General information
 See chapter "Sound emissions".
 Ensure that the appliance is accessible from all sides.
 Ensure that the substrate is level, even, solid and permanent.
9.3.1 Outdoor installation
 Provide a recess (space) in the base to enable supply pipes/
cables to be routed into the appliance from below.
Foundations with recess
4
130
800 50
1240 260 70
1
2
3
d01d02
D0000056558
1 Air discharge
2 Air intake
3 Main wind direction
4 Recess
d01 Heat pump flow
d02 Heat pump return
 Ensure that the foundations offer an adequate recess.
Example: Routing pipes in the base
A
6
8
1 2
7
4
5
3
D0000019237
A Depth of frost line
1 Heating circuit flow
2 Heating circuit return
3 Conduit for supply lines/cables
4 Foundation
5 Gravel bed
6 Drainage pipe
7 Condensate drain hose
8 Electrical cables/leads
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INSTALLATION
Preparations
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Observe the following information:
- Also protect all supply lines/cables against humidity, damage
and UV radiation by means of a conduit.
- Allow the conduits for the supply lines to protrude slightly
above the foundations. Ensure that no water can enter the
conduits.
- To facilitate connection to the appliance, we recommend
using flexible supply pipes/cables in the case of outdoor
installation.
- Only use weather-resistant cables.
- Protect the heating circuit flow and return lines against frost
with sufficient thermal insulation. Provide thermal insulation
in accordance with applicable regulations.
Note
When routing the condensate drain hose, observe chapter
"Installation / Condensate drain".
9.3.2 Indoor installation
!
Material losses
The installation room floor must be water resistant. Dur-
ing appliance operation, the outdoor air releases up to
50l of condensate per day. If humidity levels in the in-
stallation room are high, condensate may form on the
appliance and air hoses. If the condensate drain is not
installed correctly or if maintenance is not carried out
properly, water may escape. We recommend installing a
drain in the installation room floor.
The room where the appliance is installed must meet the following
conditions:
- free from the risk of frost
- The room must not be subject to a risk of explosions arising
from dust, gases or vapours.
- If installing the appliance in a plant room together with other
heating equipment, ensure that the operation of other heat-
ing equipment will not be compromised.
- Minimum volume of the installation room. The minimum
volume of the installation room is assured if the minimum
clearances are observed.
- Load bearing floor (for the weight of the appliance, see chap-
ter "Specification/ Data table").
 For installation on floating screeds, make provisions for quiet
heat pump operation.
1 2 3 54
26_03_01_1466
1 Concrete base
2 Impact sound insulation
3 Floating screed
4 Floor covering
5 Recess
 Isolate the installation surface around the heat pump by
means of a recess. After completing the installation, seal the
recess with a water-impervious and sound insulating materi-
al, such as silicone for example.
Observe the following information:
- Connect the heating circuit flow and return lines via flexible
pressure hoses. Suitable pressure hoses are listed in chap-
ter "Appliance description / Required accessories for indoor
installation".
Note
For details of the dimensions and positions of the air
intake and discharge apertures, as well as the outlets for
hydraulic lines and power cables, see chapter "Specifica-
tion / Dimensions and connections / indoor installation".
9.4 Electrical installation
WARNING Electrocution
Carry out all electrical connection and installation work
in accordance with national and regional regulations.
WARNING Electrocution
Only use a permanent connection to the power supply.
Ensure the appliance can be separated from the power
supply by an isolator that disconnects all poles with at
least 3mm contact separation. This requirement can be
met with contactors, circuit breakers, fuses/MCBs, etc.
Note
The specified voltage must match the mains voltage.
 Observe the type plate.
 For wiring, use cable with the relevant cross-sections. Ob-
serve the applicable national and regional regulations.
MCB/fuse
rating
Conductor cross-section
16 A 2.5 mm²
1.5 mm² for only two live wires and routing on a wall or in
an electrical conduit on a wall.
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INSTALLATION
Installation
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The electrical data can be found in the chapter "Specification". The
bus requires a J-Y (St) 2x2x0.8mm² cable.
!
Material losses
Provide separate fuses/MCBs for the three power circuits,
i.e. those of the appliance, the control unit and the elec-
tricemergency/booster heater.
!
Material losses
Provide common fuses/MCBs for the control cable of the
appliance and the heat pump manager.
9.5 Buffer cylinder
The installation of a buffer cylinder is essential to ensure trou-
ble-free operation of the appliance.
The buffer cylinder provides hydraulic separation of the volume
flows in the heat pump circuit and heating circuit, and also serves
as an energy source for defrosting.
!
Material losses
A buffer cylinder with diffusion-proof insulation is essen-
tial for cooling mode.
10. Installation
10.1 Transport
 When transporting the appliance, be aware of its centre of
gravity.
- The centre of gravity is in the area where the compressor is
located.
- Lifting slings for handling the standard appliance can be
hooked in anywhere on the bottom of the frame.
 Protect the appliance against heavy impact during transport.
D0000071298
- If the appliance needs to be tilted during transport, this must
only be for a short time and it must only be titled on one of
its longitudinal sides. When transporting the appliance, en-
sure the compressor is on the upper appliance side.
- The longer the appliance is tilted, the greater the distribution
of refrigerant oil in the system.
 Wait approximately 30minutes before starting the appliance
after it has been tilted.
10.2 Siting and connecting the appliance
Note
- Two screws are available at the top of the appliance
frame to secure the cover.
- At the bottom of the frame, one screw is available on
each side to secure the side panels.
 Wind the sixscrews out of the appliance frame and keep
them safe.
WPLcool
!
Material losses
With these appliances, the heating circuit flow and re-
turn lines must be insulated with vapour diffusion-proof
material.
10.2.1 Outdoor installation
26_03_01_1727_
1
1 Knock-out "supply line entry"
 Remove the knock-out "supply line entry" in the bottom of
the appliance.
 Position the standard appliance on the prepared substrate.
 Observe minimum clearances (see chapter "Preparations/
Minimum clearances").
ill]
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INSTALLATION
Installation
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26_03_01_0958_
1
3
2
654
1 Pipe bend for heating circuit flow
2 Pipe bend for heating circuit return
3 Cable duct
4 Condensate drain hose
5 Concrete foundation
6 Coarse gravel back filling
 Fit the pipe bends "heating circuit flow" and "heating circuit
return".
 Route the supply pipes/cables from below through the knock-
out in the bottom and into the appliance.
 Route the electrical cables in a cable duct.
!
Material losses
Rodents may get into the appliance through the knock-
out aperture.
 Close off the knock-out aperture.
10.2.2 Indoor installation
 Position the standard appliance on the prepared substrate.
 Pay attention to the air discharge direction.
 Place the casing cover on the appliance and secure with two
screws.
5
4
3
6
26_03_01_0170
2
1
1 "Heating flow" connection
2 "Heating return" connection
3 BUS cable
4 Control cable
5 Electric emergency/booster heater power cable
6 Appliance power cable
 In the cover, cut out the pipe outlets for the "heating flow"
and "heating return" connections.
 Route the pressure hoses from above through the cover and
into the appliance.
 Route the electrical cables from above through the cable en-
tries and into the appliance.
With the indoor installation, rotate the connector for the "heating
flow" connection through approx.145°.
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INSTALLATION
Installation
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26_03_01_0947_
1
2
1 Connector
2 Union nut
 Loosen the union nut.
 Rotate the connector.
 Retighten the union nut.
26_03_01_0173_
1
1 Pipe bend for heating circuit return
 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.
 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.
 Connect the heat pump on the heating water side. Check for
tightness.
 Connect the flexible pressure hoses to the connectors. The
pressure hoses must be at least 1 metre long.
 Ensure that the heating flow and return are connected
correctly.
 Provide thermal insulation in accordance with applicable
regulations.
 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).
 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.
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INSTALLATION
Installation
14 | WPL E | WPL cool www.stiebel-eltron.com
10.5 Filling the heating system
Heating water quality
Carry out a fill water analysis before filling the system. This may,
for example, be requested by 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. Always observe
the fill water limits specified in the "Specification / Data
table" chapter.
 Recheck these limits 8-12 weeks after commission-
ing and as part of the annual system maintenance.
Note
With a conductivity > 1000 μS/cm, desalination treatment
is recommended in order to avoid corrosion.
Note
Suitable appliances for water softening and desalinating,
as well as for filling and flushing heating systems, can be
obtained from trade suppliers.
Note
If you treat the fill water with inhibitors or additives, the
same limits apply as for desalination.
10.5.1 Filling the heating system
26_03_01_0958_
1
1 Drain
 Fill the heating system via the drain.
 After filling the heating system, check the connections for
tightness (visual and physical inspection).
10.5.2 Venting the heating system
26_03_01_1726_
1
1 Quick-action air vent valve
 Vent the pipework carefully.
 In doing so, also activate the quick-action air vent valve.
10.6 Minimum flow rate
Note
In combination with an hydraulic module or integral cyl-
inder, the flow rate can be checked and set at the heat
pump manager. Observe that the flow rate is set indirectly
via the rating of the pump used.
 Call up the flow rate in the heat pump manager
menu “INFO/ HEATING/ FLOW RATE” or “INFO/
DHW/ FLOW RATE”.
 Adjust the flow rate in the heat pump manager
menu “COMMISSIONING/ HEATING/ HEATING CIRC
PUMP RATE” or “COMMISSIONING/ DHW/ DHW
PUMP RATE”.
The minimum flow rate is set via the temperature differential of
the buffer circuit.
Set the buffer charging pump so that the value is equal to or lower
than the maximum temperature differential.
The setting is made in heat pump mode. In order to do this,, firstly
make the following settings:
 Temporarily remove the fuse from the electric emergency/
booster heater to isolate the emergency/booster heater from
the power supply. Alternatively, switch OFF the second heat
generator.
 Operate the appliance in heating mode.
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INSTALLATION
Installation
www.stiebel-eltron.com WPL E | WPL cool | 15
10.6.1 Flow rate with buffer cylinder
When using a buffer cylinder, in menu "SETTINGS/ HEATING/
STANDARD SETTINGS", set parameter "BUFFER OPERATION" to
"ON".
The flow rate can be adjusted using the temperature differential
of the buffer circuit. The value must not fall below the minimum
flow rate.
Maximum temperature differential on the heating side with buffer
cylinder:
1
0
2
4
6
8
10
-15 -10 -5 0 5 10 15 20 25 30
D0000063550
1 Nominal flow rate
X Outside temperature [°C]
Y Maximum temperature differential [K]
 Make the settings at the circulation pump when the temper-
ature differential between the flow and return temperature
has stabilised.
 Compare the resulting temperature difference between the
flow and return at the appliance with the diagram “Maxi-
mum temperature differential on the heating side with buffer
cylinder”.
 Set the buffer charging pump so that the maximum tempera-
ture differential is achieved or undershot.
 If the appliance will be used for DHW heating, check the set-
ting of the delivery head in DHW mode.
 If necessary, adjust the delivery head setting for the DHW
primary pump.
 Set the buffer charging pump and the DHW primary pump to
∆p constant.
10.7 Condensate drain
A condensate drain hose is fitted to the defrost pan to enable the
condensate to drain off. The condensate drain hose is delivered
inside the refrigeration unit.
 Ensure the condensate drain hose is not kinked.
 Ensure the condensate drain hose is not inserted airtight into
a drain. Unhindered drainage requires an ingress of air.
 Route the hose with a continuous fall.
 Use a suitable condensate pump if there is insufficient fall.
Take the building characteristics into account.
 If using a condensate pump, ensure that it delivers at least 6
l/min.
10.7.1 Outdoor installation
D0000068605
1
1 Knock-out "supply line entry"
 Route the condensate drain hose downwards through the
knock-out “outlet for supply pipe/cable” and out of the
appliance.
 Channel the condensate into a drain or allow it to drain into a
coarse gravel soakaway. Ensure the pipework is free from the
risk of frost.
10.7.2 Indoor installation
You can route the condensate drain hose out of the appliance
towards the left through the knock-out “condensate drain outlet”
(see chapter “Specification/ Dimensions and connections/ Indoor
installation”) or downwards through the floor plate.
.O:. ----- /~I
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INSTALLATION
Power supply
16 | WPL E | WPL cool www.stiebel-eltron.com
Condensate drain towards the left
26_03_01_0956
1
1 Knock-out "condensate drain outlet"
 Use pliers to remove the knock-out "condensate drain outlet"
from the left-hand side panel.
 Route the condensate drain hose to the left and out of the
appliance.
 Route the condensate into a drain.
Condensate drain downwards
If a bottom drain is provided, you can drain the condensate down-
wards through the "supply line entry" in the bottom of the appli-
ance.
26_03_01_1728_
1
1 Knock-out "supply line entry"
 Remove the knock-out "supply line entry" in the bottom of
the appliance.
 Route the condensate drain hose diagonally through the
knock-out aperture "supply line entry".
 Secure the condensate drain hose to ensure it does not slip
out of place.
 Route the condensate into the drain in the floor.
10.8 Checking the draining of condensate
After routing the condensate drain hose, check that the condensate
can drain correctly. Proceed as follows:
 Pour water onto the evaporator, which will then flow into
the defrost pan. Please note the maximum condensate drain
capacity of 6l/min.
 Check whether the water is draining off through the conden-
sate drain hose.
10.9 High limit safety cut-out for underfloor heating
systems
!
Material losses
In order to prevent excessively high flow temperatures
in the underfloor heating system causing damage in the
event of a fault, we always recommend using a high limit
safety cut-out to limit the system temperature.
11. Power supply
Note
Please observe the heat pump manager operating and
installation instructions.
The connection must only be carried out by a qualified contractor
and in accordance with these instructions.
You must have permission to connect the appliance from the rel-
evant power supply utility.
11.1 Control panel
WARNING Electrocution
Before working on the appliance, isolate it from the
power supply at the control panel.
Note
The terminals are located in the appliance control panel.
145
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INSTALLATION
Power supply
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26_03_01_1726_
1
1 Control panel
 Observe the information in the "Preparations / Electrical in-
stallation" chapter.
 Remove the control panel from the casing.
 Use appropriate electrical cables in accordance with local
regulations.
 Check that the strain relief fittings are working as intended.
 Connect the heating circulation pump to the heat pump man-
ager in accordance with the technical guides.
Terminals X3: Appliance and electric emergency/booster heater
(DHC)
 Connect the appliance to terminal X3.
 Connect the electric emergency/booster heater to terminal X3
if you want to utilise the following appliance functions:
Appliance func-
tion
Effect of the electric emergency/booster
heater
Mono energetic op-
eration
If the heat pump undershoots the dual mode point, the
electric emergency/booster heater safeguards both
the heating operation and the delivery of high DHW
temperatures.
Emergency mode Should the heat pump suffer a fault that prevents its
continued operation, the heating output will be cov-
ered by the electric emergency/booster heater.
Heat-up program
(only for underfloor
heating systems)
Where return temperatures are < 25°C, the electric
emergency/booster heater must provide the necessary
heat for screed drying.
With these low system temperatures, the drying heat
must not be provided by the heat pump, otherwise
the frost protection of the appliance can no longer be
guaranteed during the defrost cycle.
When the heat-up program has ended, you can discon-
nect the electric emergency/booster heater if it is not
required for the appliance operation.
Please note that during the heat-up program, emer-
gency mode is not available.
Pasteurisation control The electric emergency/booster heater starts automat-
ically when the pasteurisation control is active in order
to regularly heat the DHW to 60 °C to protect it against
the growth of legionella bacteria.
X3
PE 12
26_03_01_0948
1 Heat pump power supply (WP)
L1, L2, L3, N, PE
2Electric emergency/booster heater (DHC)
L1, L2, L3, N, PE
Connected
load
Terminal assignment
2.6 kW L1 N PE
3.0 kW L2 N PE
3.2 kW L3 NPE
5.6 kW L1 L2 N PE
5.8 kW L1 L3 NPE
6.2 kW L2 L3 NPE
8.8 kW L1 L2 L3 NPE
!
Material losses
The compressor in the appliance can only turn in one
direction. If the appliance is not connected correctly, the
compressor remains in operation for 30 seconds then
switches off.
On the heat pump manager display, the fault message NO OUTPUT
appears.
 To change the direction of the rotating field, when the power
is disconnected, swap over two phases.
 Cover and seal the mains terminal (X3) when all electric ca-
bles have been connected.
-
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INSTALLATION
Fitting casing components
18 | WPL E | WPL cool www.stiebel-eltron.com
Connections X4, X2: Control unit and low voltage
Note
Provide common fuses/MCBs for the control cable of the
appliance and the heat pump manager.
26_03_01_0949_
12
X2
X4
1 Control unit ("Steuerung")
Power supply: L, N, PE
Control inputs:
Heat source 2 (2. WE)
External control, e.g. standalone operation (Ext.St.)
2 Low voltage (LV)
BUS High H
BUS Low L
BUS earth
BUS " + " (not required)
12. Fitting casing components
12.1 Outdoor installation
2
13
1
54
26_03_01_0929_
1 Side panel
2 Cover
3 Front panel
4 Type plate
5 Back panel
26_03_01_1738
1
2
3
1 Bevelled edge
2 Control panel
3 Screw
!
Material losses
The cover protects the PCB from water ingress.
 Install the cover with the drip edge above the PCB.
 Secure the cover with two screws.
 Hook the side panels, front panel and back panel into the
hooks on the standard appliance. Secure the casing sections
at the bottom with one screw each.
 Affix the type plate supplied in a highly visible position on
one of the appliance casing panels.
l.
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INSTALLATION
Fitting casing components
www.stiebel-eltron.com WPL E | WPL cool | 19
12.2 Indoor installation
12.2.1 Sealing the appliance
Note
If you want to prevent negative pressure in the instal-
lation room, you can seal the appliance by affixing the
plastic screen provided.
Before fitting the casing sections, seal the appliance by affixing
a plastic film; this will prevent condensation forming under all
operating conditions.
The plastic film is supplied with the casing sections.
26_03_01_1456
 Apply fabric tape to seal the hole at the bottom of the frame
on the left-hand side. The fabric tape is supplied with the ac-
cessory "thermally insulated air hose".
26_03_01_1454
 Hang the plastic screen with the pre-cut holes onto the hooks
on the appliance.
26_03_01_1455
 Remove the backing from the adhesive strips on the frame
and on the plastic screen.
 Secure the plastic screen by pressing it onto the standard
appliance.
 Seal the gaps around the hooks with fabric tape.
12.2.2 Fitting casing components
2
13
1
54
26_03_01_1443
1 Side panel
2 Cover
3 Front panel
4 Type plate
5 Back panel
 Place the cover on the appliance and secure with two screws.
 Hook the side panels, front panel and back panel into the
hooks on the standard appliance. Secure the casing compo-
nents with one screw each.
 Affix the type plate supplied in a highly visible position on
one of the appliance casing panels.

INSTALLATION
Fitting casing components
20 | WPL E | WPL cool www.stiebel-eltron.com
12.2.3 Routing air hoses
Note
In the case of heat pumps installed indoors, if a blow-
er door test to EN13829 is to be carried out, then all
apertures which are purposely provided in the building
envelope must be closed or sealed off before the air hoses
are installed.
 For the blower door test, seal off the heat pump
supply air and extract air ducts.
Note
Air hoses guide the intake air to the appliance and route
the discharge air from the appliance outdoors. They are
highly flexible, thermally insulated and self-extinguishing
in case of fire.
General information
The air hose can be extended by turning the hose spirals into
each other. There must be an overlap of approx.30 cm. The total
length of hoses on the air intake and discharge sides must not
exceed 8m.
 Never incorporate more than four 90° bends. The radius of
the bends must be at least 600mm, relative to the centre of
the hose.
 Cut to size using a sharp knife. The hose spirals can be cut
with wire cutters.
 Secure the air hose at intervals of approx. every1m to pre-
vent it from sagging.
 Manipulate the ends of the air hoses to fit the oval shape of
the connectors on the cover and the hose connection panels
or wall outlets.
Fitting the air hoses
D0000070816
 Firstly, push the outer hose slightly upwards.
D0000070817
 Push the inner hose halfway down the connector.
D0000070818
 Seal the inner hose by affixing it to the connector using the
fabric tape provided.
D0000070819
 With the sound-optimised hoses (LSWP560-4S), pull the
sheet over the connector.

INSTALLATION
Commissioning
www.stiebel-eltron.com WPL E | WPL cool | 21
D0000070820
 With the sound-optimised hoses (LSWP560-4S), seal the
sheet to the connector using the fabric tape provided.
D0000070821
 Place the sealing strip provided around the connector.
D0000070822
 Pull the outer hose over the connector.
D0000070824
 Secure the hose using the oval hose clip provided and seal it.
Insulating the brickwork
Ensure that no cold bridges form between the brickwork and the
hose connection panels or wall outlets. Cold bridges can result in
condensation forming in the brickwork.
 If necessary, fit suitable insulation between the brickwork
and the hose connection panels or wall outlets.
13. Commissioning
Note
When quick start is used, the starting resistors are not
patched in.
 Do not use quick start when measuring the starting
current.
A WPM heat pump manager is required to operate the appliance.
All necessary adjustments prior to and during operation are made
on this device.
A contractor must commission the appliance, make all the set-
tings at the commissioning level of the heat pump manager, and
instruct the user.
Carry out commissioning in accordance with these installation
instructions and the operating and installation instructions of the
heat pump manager. Our customer support can assist with com-
missioning, which is a chargeable service.
Where this appliance is intended for commercial use, the reg-
ulations of the relevant Health & Safety at Work Act may apply
during commissioning. For further details, check with your local
authorising body; in Germany for example, this is theTÜV.
13.1 Check before commissioning the heat pump
manager
!
Material losses
Observe the maximum system temperature for underfloor
heating systems.
 Check whether the heating system is charged to the correct
pressure and whether the quick-action air vent valve in the
heat pump is open.
 Check whether the outside temperature sensor and the re-
turn sensor are correctly placed and connected.
 Check whether additional sensors are correctly positioned
and connected.
 Check whether the power supply is connected correctly.
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