STIEBEL ELTRON WPL 13 basic Instruction Manual

OPERATION AND INSTALLATION
Air source heat pump
» WPL 13 basic
» WPL 20 basic
» WPL 13 S basic
» WPL 18 S basic

2| WPL basic | WPL S basic www.stiebel-eltron.com
CONTENTS
SPECIAL INFORMATION
OPERATION
1. General information �����������������������������������������3
1.1 Further applicable 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 General safety instructions ������������������������������������ 4
2.3 Test symbols ������������������������������������������������������ 4
3. Appliance description ���������������������������������������4
3.1 Function ����������������������������������������������������������� 5
4. Settings �������������������������������������������������������5
5. Maintenance and care ���������������������������������������5
6. Troubleshooting ����������������������������������������������5
INSTALLATION
7. Safety����������������������������������������������������������6
7.1 General safety instructions ������������������������������������ 6
7.2 Instructions, standards and regulations �������������������� 6
8. Appliance description ���������������������������������������6
8.1 Standard delivery������������������������������������������������ 6
8.2 Accessories�������������������������������������������������������� 6
9. Preparations ��������������������������������������������������6
9.1 Acoustic emissions ���������������������������������������������� 6
9.2 Minimum clearances�������������������������������������������� 7
9.3 Preparing the installation site��������������������������������� 8
9.4 Electrical installation������������������������������������������� 10
9.5 Buffer cylinder �������������������������������������������������� 10
10. Mounting���������������������������������������������������� 10
10.1 Handling���������������������������������������������������������� 10
10.2 Positioning ������������������������������������������������������� 10
10.3 Heating water connection������������������������������������� 11
10.4 Flow rate, heating side ���������������������������������������� 12
10.5 Condensate drain ����������������������������������������������� 13
10.6 Checking the condensate drain ������������������������������ 13
10.7 2. Heat source ��������������������������������������������������� 14
10.8 Safety temperature controller for underfloor heating
system ������������������������������������������������������������ 14
11. Electrical connection��������������������������������������� 14
11.1 Fitting casing components������������������������������������ 16
11.2 Routing air hoses ����������������������������������������������� 18
11.3 Fitting air hoses������������������������������������������������� 19
11.4 Thermally insulating the wall outlets����������������������� 19
12. Commissioning ��������������������������������������������� 20
12.1 Checks before commissioning�������������������������������� 20
12.2 Commissioning�������������������������������������������������� 20
12.3 Settings ����������������������������������������������������������� 21
13. Taking the appliance out of use �������������������������� 22
13.1 Standby ����������������������������������������������������������� 22
13.2 Power interruption ��������������������������������������������� 22
14. Appliance handover���������������������������������������� 22
15. Troubleshooting �������������������������������������������� 22
15.1 Elements on the IWS������������������������������������������� 22
15.2 Cleaning the condensate drain������������������������������� 23
15.3 Resetting the high limit safety cut-out ��������������������� 23
15.4 Fan noise ��������������������������������������������������������� 23
16. Maintenance ������������������������������������������������ 23
17. Specification ����������������������������������������������� 24
17.1 Connections and dimensions, basic external
installation ������������������������������������������������������� 24
17.2 Connections and dimensions, standard external
installation ������������������������������������������������������� 24
17.3 Connections and dimensions, internal installation ������ 25
17.4 Wiring diagram WPL basic standard appliance (3-
phase)������������������������������������������������������������� 26
17.5 Wiring diagram WPL S basic (1-phase)��������������������� 28
17.6 Output diagrams WPL 13 basic������������������������������� 30
17.7 Output diagrams WPL 20 basic������������������������������� 31
17.8 Output diagrams WPL 13 S basic ���������������������������� 32
17.9 Output diagrams WPL 18 S basic ���������������������������� 33
17.10 Data table ��������������������������������������������������������34
GUARANTEE
ENVIRONMENT AND RECYCLING

www.stiebel-eltron.com WPL basic | WPL S basic | 3
SPECIAL INFORMATION | OPERATION
General information
SPECIAL INFORMATION
- The appliance may be used by children aged 8
and up and persons with reduced physical, sen-
sory or mental capabilities or a lack of experi-
ence provided that they are supervised or they
have been instructed on how to use the appliance
safely and have understood the resulting risks.
Children must never play with the appliance. Chil-
dren must never clean the appliance or perform
user maintenance unless they are supervised.
- Only use a permanent connection to the power
supply. The appliance must be able to be sepa-
rated from the power supply 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 contractor if required (to return the
system to its original condition).
- The heat pump power supply must not be inter-
rupted, even outside the heating season. Other-
wise the system is at risk from frost.
- The heat pump manager automatically switches
the heat pump to summer or winter mode.
- If the heat pump and frost protection are com-
pletely switched off, drain the system on the
water side.
OPERATION
1. General information
The chapters „Special Information“ and „Operation“ are intended
for both the user and qualified contractors.
The chapter entitled “Installation” is intended for qualified con-
tractors.
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 Further applicable documents
Operating and installation instructions of the heat pump
manager WPM
Operating and installation instructions of all other com-
ponents in the system
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-
serious or minor injury.
!

OPERATION
Safety
4| WPL basic | WPL S basic www.stiebel-eltron.com
1.3 Other symbols in this documentation
Note
Notes are bordered by horizontal lines above and below
the text. General information is identified by the symbol
shown on the left.
 Read these texts carefully.
Symbol
Damage to the appliance and environment
Appliance disposal
 This symbol indicates that you have to do something. The ac-
tions you need to take are 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
Explanations to determine and interpret the specified standardised
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.
Further 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
Only qualified contractors should carry out installation, commis-
sioning, maintenance and repair of the appliance.
Contractors are responsible for adherence to all currently applica-
ble regulations during installation and commissioning.
2.1 Intended use
The appliance is intended to heat buildings and domestic hot water
(DHW). The appliance is designed for extracting energy from the
air and utilising this energy in water-based heating systems within
the stated operating temperature range.
This appliance is designed for domestic use. It can be safely oper-
ated by untrained personnel. The appliance can also be used in a
non-domestic environment, e.g. in a small business, as long as it
is used in the same way.
Any other use beyond that described shall be deemed inappropri-
ate. Observation of these instructions is also part of the correct use
of this appliance. Any changes or modifications to this appliance
void all warranty rights.
2.2 General safety instructions
Observe the following safety instructions and regulations.
- The electrical installation and installation of the heating cir-
cuit must only be carried out by a recognised, qualified con-
tractor or by our customer service engineers
- Contractors are responsible for adherence to all currently ap-
plicable regulations during installation and commissioning.
- Operate the appliance only when fully installed and with all
safety equipment fitted
- Protect the appliance from dust and dirt ingress during
building work
!
WARNING Injury
The appliance may be used by children aged 8 and up
and persons with reduced physical, sensory or mental
capabilities or a lack of experience provided that they
are supervised or they have been instructed on how to
use the appliance safely and have understood the result-
ing risks. Children must never play with the appliance.
Children must never clean the appliance or perform user
maintenance unless they are supervised.
2.3 Test symbols
See type plate on the appliance.
3. Appliance description
The appliance is an air source heat pump that operates as a heating
heatpump.Heat isextracted from theoutdoor air ata low temperature
level, and is then transferred to the heating water at a higher level.
The heating water can be heated up to a flow temperature of 75 °C.
The appliance is equipped with an electric booster heater (DHC).
The electric booster heater is activated if the dual mode point is
not achieved in mono mode operation in order to ensure the heat-
ing operation and the availability of high DHW temperatures. In
such cases the electric booster heater is activated as an additional
heat source in mono energetic operation.
!

OPERATION
Settings
www.stiebel-eltron.com WPL basic | WPL S basic | 5
Further operational characteristics:
- Suitable for underfloor and radiator heating systems
- Still extracts heat from the outdoor air at – 20 °C outside
temperature
- Corrosion-protected, external casing components made from
hot-dipped galvanised sheet steel plus powder-coated finish
- Comprises all components required for operation and all
safety equipment
- Filled with non-combustible safety refrigerant
Note
The heat pump manager is required for control over the
entire heating system.
3.1 Function
Heat is extracted from the outdoor air via the heat exchanger
(evaporator) on the air side. The now evaporated refrigerant is
compressed with one or two compressors. Electrical energy is
necessary for this process. Now, the refrigerant is at a higher
temperature level and transfers the heat drawn from the air via
an additional heat exchanger (condenser) to the heating system.
During this process, the refrigerant expands again, 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 from this defrosting col-
lects in the defrost pan and is drained off via a hose.
In 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.
4. Settings
The appliance is controlled by means of the WMP II heat pump
manager; no other control unit is required.
 Observe the heat pump manager operating and installation
instructions.
5. Maintenance and care
A damp cloth is sufficient for cleaning all plastic and sheet steel
parts. Never use abrasive or corrosive cleaning agents.
Check the condensate drain monthly (visual inspection). Remove
contaminants and blockages immediately.
!
Damage to the appliance and environment
Keep the air discharge and intake apertures free from
snow and leaves.
We recommend an annual inspection (establishing the actual
state) and, if required, maintenance (returning the set state) by a
qualified contractor.
6. Troubleshooting
Fault Cause Remedy
There is no hot
water or the
heating system
stays cold.
There is no voltage at the
appliance.
Check the fuses/MCBs in your
fuse box/distribution panel.
If required, reset the MCBs. If
the MCBs trip again after being
reset, notify your contractor.
Water is leaking
from the appli-
ance.
The condensate drain
may be blocked.
Clean the condensate drain as
described in chapter ‚Care and
maintenance‘.
Indoor installa-
tion: Condensate
is collecting on
the outside of the
appliance or the
air hoses.
The drying out phase of
the building is not yet
complete.
If the room is sufficiently well
ventilated or dehumidified,
this condensate should no
longer form on the appliance ap-
prox.two years after the house
was built.
The humidity in the air is
relatively high (≥60%).
When the weather conditions
change, condensation should no
longer form on the appliance.
The appliance is located
in a moisture-prone
area. Moisture-prone
areas are rooms where
the humidity in the air is
high due to the drying of
laundry, for exam
ple.
Make sure that the room is
adequately ventilated and dehu-
midified. If necessary, hang your
laundry up in a different room.
Use a vented tumble dryer.
Please note that condenser
tumble dryers do not reduce the
humidity in the air.
The air hoses are incor-
rectly fitted or sealed.
Cold air escapes.
Check whether the air hoses are
correctly fitted and sealed. If
necessary, call your contractor.
Outdoor installa-
tion: Condensate
is collecting on
the outside of the
appliance.
The heat pump is
drawing heat from the
outdoor air to heat the
building. This can cause
the humidity in the out-
door 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.
Sample type plate
Montageanweisung beachten! Dichtheit geprüft! Made in Germany
*xxxxxxxxxxxxxxxxxx*
26�03�01�1736
1
1 Number on the type plate

6| WPL basic | WPL S basic www.stiebel-eltron.com
INSTALLATION
Safety
INSTALLATION
7. Safety
7.1 General safety instructions
- Only qualified contractors should carry out installation, com-
missioning, maintenance and repair of the appliance.
- We guarantee trouble-free function and operational reliabil-
ity only if the 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.
8. Appliance description
For external installation the appliance offers additional frost pro-
tection of the heating water pipes. The integral frost protection
circuit starts the circulation pump in the heat pump circuit auto-
matically at +8 °C condenser temperature, and thereby ensures
circulation in all water-filled sections. The heat pump is started
automatically no later than when the temperature inside the buffer
cylinder drops below +5 °C.
Air hoses guide the intake air from the outside to the appliance and
route the discharge air from the appliance to the outside. These
are highly flexible, thermally insulated and are self-extinguishing
in case of fire in accordance with ASTMD1692-67T.
8.1 Standard delivery
8.1.1 Standard appliance
- Type plate
- Wiring diagram
8.1.2 Required accessories, external installation
The appliance casing components are supplied in a separate pack.
Description
Accessory for outdoor installation WPL .. Basic
Accessory for outdoor installation WPL 13/18/23 A
8.1.3 Required accessories, internal installation
The appliance casing components are supplied in a separate pack.
Description
Accessory for indoor installation WPL 13/18/23 I
WPIC
WPIC B
8.2 Accessories
8.2.1 Required accessories, internal and external installation
Description
Heat pump manager WPMS 3 or WPMW 3
Remote control for heating systems
Contact sensor
Immersion sensor
8.2.2 Additional required accessories for internal installation
Description
Thermally insulated air hose, 3m or 4m long
Hose connection plate
Wall outlet AWG 560
8.2.3 Further accessories
Description
Buffer cylinder
Pressure hose G 1¼ x 1 m (DN 32)
Pressure hose G 1¼ x 2 m (DN 32)
Pressure hose G 1¼ x 5 m (DN 32)
Pressure hose G 1¼ x 1 m (DN 32), can be trimmed
Hose fittings for pressure hose G 1¼ (DN 32)
Condensate pump
9. Preparations
9.1 Acoustic emissions
On the air intake and air discharge sides, the appliance is louder
than on the enclosed sides. Observe the following information
when selecting the installation location.
Note
For details regarding the sound power level, see chapter
"Specification / Data table".
9.1.1 Sound emissions for external installation
- Lawn areas and shrubs contribute to the reduction of noise.
- Noise propagation can also be reduced through dense pali-
sades or similar.
 Ensure that the air intake direction is in line with the main
wind direction. Air should not be drawn in against the wind.
 Never direct the air intake or discharge towards noise-sensi-
tive rooms of the house, e.g. bedrooms.
 Avoid installation on large, echoing floor areas, e.g. tiled
floors.
 Avoid installation between reflective building walls. Reflec-
tive building walls can increase the sound level.
Note
Provide a recess (space) in the substrate to enable water
and electrical pipes/cables to be connected from below.
Also observe the chapter “Installation/Siting”.

www.stiebel-eltron.com WPL basic | WPL S basic | 7
INSTALLATION
Preparations
9.1.2 Sound emissions for internal installation
Never install the appliance directly below or next to living rooms
or bedrooms.
Never install on joists.
 Isolate the installation surface. See chapter “Preparing the
installation site for internal installation”.
 Connect the heating flow and return using flexible pres-
sure hoses. Suitable pressure hoses can be found in chapter
“Accessories”.
 Insulate all pipe fixings and wall outlets against structure-
borne noise transmission.
 Never direct the air intake and discharge apertures in exter-
nal walls towards neighbouring windows or living rooms/
bedrooms.
9.2 Minimum clearances
9.2.1 External installation
≥500 ≥500≥500 ≥1000
≥700
D0000019239
≥500 ≥1000
≥500
≥500
≥700
D0000019241
91�00�00�0036
 Do not install the appliance in a recess. Two sides of the ap-
pliance must remain exposed.
 Maintain the minimum clearances to ensure trouble-free op-
eration of the appliance and facilitate maintenance work.
 In order to prevent air “short circuits”, maintain the mini-
mum clearances in the case of surrounding structures and
in particular in the case of cascades. Maintain the flow rate
on the heat source side (see chapter “Specification / data
table“).
!
Damage to the appliance and environment
Please note that the outdoor air must be able to flow
unimpeded into the appliance, and the exhaust air must
be able to be expelled without obstruction.
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 surrounded by any objects
such as buildings, walls or fences.
 If necessary, maintain a greater clearance to the surrounding
objects.
!
Damage to the appliance and environment
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. Ob-
serve the details in chapter “Specification / Data table”.
 If necessary, maintain a greater clearance to the surrounding
objects.
If the air discharge side of the appliance faces a wall of the house,
condensate may form on this wall from the cool air at the air
discharge.
Note
If the air discharge side faces house walls, maintain a
minimum clearance of 2m between the appliance and
the building.

8| WPL basic | WPL S basic www.stiebel-eltron.com
INSTALLATION
Preparations
9.2.2 Internal installation
≥500
≥500
≥500
≥500
≥1000
D0000019242
 Maintain the minimum clearances to ensure trouble-free op-
eration of the appliance and facilitate maintenance work.
9.3 Preparing the installation site
9.3.1 General information
 Ensure that the appliance is accessible from all sides.
- The substrate must be horizontal, level, solid and permanent.
 Observe the minimum clearances in chapter “Preparations/
Minimum clearances”.
 Ensure the entire heat pump frame is in contact with the sub-
strate. Uneven substrates can increase sound emissions.
9.3.2 Preparing the installation site for external installation
 Observe chapter “Sound emissions for external installation”.
Example: Foundations with recess
3
1
2
4
1000
1440
190
170
300
150
D0000019240
1 Air intake
2 Air discharge
3 Main wind direction
4 Recess

www.stiebel-eltron.com WPL basic | WPL S basic | 9
INSTALLATION
Preparations
Example: Routing pipes underground
A
12
6
8
7
4
5
3
D0000019238
A Frost level
1 Heating circuit flow
2 Heating circuit return
3 Conduit for supply lines
4 Foundation
5 Gravel bed
6 Drainage pipe
7 Condensate hose
8 Electrical cables/leads
 Use only cables suitable for outdoor use.
 Protect the flow and return pipes against frost with sufficient
thermal insulation. Provide thermal insulation in accordance
with applicable regulations.
 Protect all supply lines against humidity, damage and UV ra-
diation by means of a conduit.
Note
When routing the condensate hose, observe the chapter
“Installation / condensate drain”.
9.3.3 Preparing the installation site for internal installation
 Observe chapter “Sound emissions for internal installation”.
 Isolate the mounting surface around the heat pump by re-
cesses. After completing the installation, seal these recesses
with a water-impervious and sound insulating material, such
as silicone for example.
1 2 3 54
26�03�01�1466
1 Concrete base
2 Impact sound insulation
3 Floating screed
4 Floor covering
5 Recess
In chapter “Specification/Connections and dimensions, internal
installation”, the location and dimensions of the air intake and
discharge apertures as well as those of the outlets/entries for
water pipes and cables in the appliance cover can be seen.
!
Material losses
The floor of the installation room must be water resistant.
During appliance operation, the outdoor air releases up
to 50l of condensate per day. 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 floor of the installation room.

10 | WPL basic | WPL S basic www.stiebel-eltron.com
INSTALLATION
Mounting
9.4 Electrical installation
DANGER Electrocution!
Carry out all electrical connection and installation work
in accordance with national and regional regulations.
DANGER Electrocution!
Only use a permanent connection to the power supply.
The appliance must be able to 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 by contactors, isolators, fuses etc.
Note
The specified voltage must match the mains voltage. Ob-
serve the type plate.
Route cables with the following cross-sections in accordance with
the respective fuse rating:
Fuse rating Cable cross-section
C 16 A 2.5 mm²
1.5 mm² with only two live cores and routing on a wall or in
an electrical conduit on a wall
C 25 A 6.0 mm² for routing through a wall
4.0 mm² for routing multi-core cables on a wall or in an
electrical conduit on a wall
C 35 A 6.0 mm² for routing multi-core cables on a wall or in an
electrical conduit on a wall
The electrical specifications are given in the “Data table”. The BUS
cable requires a cable J-Y (St) 2x2x0.8mm².
Note
Provide separate fuses/MCBs for the 3 power circuits of
the appliance, the control unit and the electric booster
heater.
9.5 Buffer cylinder
A buffer cylinder is recommended to ensure trouble-free appliance
operation. The buffer cylinder not only provides hydraulic separa-
tion of the volume flow in the heat pump and heating circuit, but
also serves as an energy source for defrosting the evaporator.
10. Mounting
10.1 Handling
 Pay attention to the appliance’s centre of mass when trans-
porting the appliance.
The centre of mass is located in the compressor area.
- Lifting slings for transporting the standard appliance can be
hooked in anywhere on the lower frame.
 Protect the appliance against heavy impact during transport.
- Only allow the appliance to be tilted during transport for a
short time to one of its longitudinal sides.
The longer the appliance is tilted, the greater the distribution
of refrigerant oil in the system. Wait approx. 30 minutes be-
fore starting the appliance after it has been tilted.
10.2 Positioning
10.2.1 General information
 Undo the fixing screws on the appliance frame and keep
them safe. Two or four screws are provided in the frame
to secure the cover. One screw respectively is provided to
secure the side panels (see also chapter “Fitting the casing
components”).
Note
Fit the casing components only after the electrical and
hydraulic connections have been made.
10.2.2 Internal installation
 Position the standard appliance on the prepared substrate.
1
2
3
3
26�03�01�1650�
4
1 Connector
2 Union nut
3 Pipe bend, heating circuit return
4 Condensate drain hose
 Undo the union nut from the heating flow.
 Rotate the connector approx. 145°.
 Retighten the union nut.
 Fit the pipe bend for the heating circuit return (part of the
“Internal installation accessories”).
 Route the condensate hose out of the appliance, either on the
r.h. or the l.h. side.

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 >1000μS/cm, desalination treatment
is recommended in order to avoid corrosion.

12 | WPL basic | WPL S basic www.stiebel-eltron.com
INSTALLATION
Mounting
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.
Venting the heating system
1
26�03�01�1638�
1 Air vent valve
 Vent the pipework carefully. For this, also activate the air
vent valve integrated into the heating flow inside the heat
pump.
10.4 Flow rate, heating side
10.4.1 Minimum flow rate for operation without a buffer
cylinder
The appliance is designed in such a way that no buffer cylinder
is required to provide hydraulic separation of the flow in the heat
pump circuit and the heating circuit in conjunction with space
heating systems.
In an installation with several heating circuits, we recommend
using a low loss header.
The minimum flow rate is set via the temperature differential of
the heating system.
Set the heating circuit pump so that the value is equal to or lower
than the maximum temperature differential.
The setting is made in heat pump operation alone. For this, the
following settings must be carried out first:
 Temporarily remove the fuse from the electric emergency/
booster heater to isolate it from the power supply. Alterna-
tively, switch OFF the second heat source.
 Operate the heat pump in heating mode.
Minimum flow rate with single room control via FE7orFEK
Maximum temperature differential on the heating side with over-
flow valve or single room control with remote control
-15 -10 -5 0 5 10 15 20 25 30
0
2
4
6
8
10
12
84�03�01�0172
X Outside temperature [°C]
Y Maximum temperature differential [K]
In this case, one or more heating circuits in the heating system
must be left open. The open heating circuit(s) should be installed
in the lead room (room in which the remote control is installed,
e.g. the living room). Single room control can then be carried
out with the remote control or indirectly by matching the heating
curve.
 Fully open the heating circuit(s) in the lead room.
 Close all other heating circuits.
 If an overflow valve is installed in the heating system, close
this fully before determining the minimum flow rate.
 Make the settings at the circulation pump when the tempera-
ture differential between the flow and return temperature
has stabilised.
Set the heating circuit pump so that the minimum flow rate re-
quired to operate the system is safeguarded.
Note
Never adjust the flow rate of the cylinder primary pump.
The flow rate of the cylinder primary pump has been
optimised at the factory.
 Compare the resulting temperature differential between the
flow and return at the appliance with the diagram “Maximum
temperature differential on the heating side with overflow
valve or single room control with remote control”.
 Set the heating circuit pump so that the value is equal to or
lower than the maximum temperature differential.

www.stiebel-eltron.com WPL basic | WPL S basic | 13
INSTALLATION
Mounting
10.4.2 Flow rate with low loss header or buffer cylinder
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 low
loss header or buffer cylinder
-15 -10 -5 0 5 10 15 20 25 30
0
2
4
6
8
10
12
84�03�01�0172
X Outside temperature [°C]
Y Maximum temperature differential [K]
 Make the settings at the circulation pump when the tempera-
ture differential between the flow and return temperature
has stabilised.
 Compare the resulting temperature differential between the
flow and return at the appliance with the diagram “Maximum
temperature differential on the heating side with low loss
header or buffer cylinder”.
 Set the delivery head of the heating circuit pump to a level
that safeguards the heating flow rate required to operate the
heat pump (see chapter “Specification / Data table”).
 If the appliance will be used for DHW heating, check the set-
ting of the delivery head in DHW mode.
 If necessary, adjust the setting of the delivery head to match
the heating circuit pump.
10.4.3 Using highly energy efficient pumps
If you use a highly energy efficient pump as the heating circuit
pump, you will have to adjust the minimum flow rate using the
temperature differential of the heating system.
 Set the heating circuit pump to ∆p-constant.
 Set ∆p-constant to the value at which the maximum temper-
ature differential of the heating system is reached.
When connecting the electric emergency/booster heater (DHC),
a flow sensor must be connected to the heat pump manager and
installed close to the heat pump at the heating flow.
10.5 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.
 Route the hose with a continuous fall.
 Use a suitable condensate pump if there is insufficient fall.
Observe the building characteristics.
 If using a condensate pump, ensure that it is sized for a
pump rate of at least 6 l/min.
10.5.1 External installation
 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.
10.5.2 Internal installation
You can route the condensate drain hose to the left or right
through the knock-out “outlet for condensate drain” (see chapter
“Specification / Dimensions and connections / Internal installa-
tion”) and out of the appliance.
26�03�01�0956
1
1 Knock-out “outlet for condensate drain”
 Use pliers to break out the knock-out “outlet for condensate
drain” from the l.h. side panel.
 Route the condensate drain hose to the left or right out of the
appliance.
 Route the condensate into a drain.
If a bottom drain is to be used, you can drain the condensate
downwards through the “outlet for supply pipe/cable” in the bot-
tom of the appliance.
 Route the condensate drain hose diagonally through the
knock-out aperture “outlet for supply pipe/cable”.
 Secure the condensate drain hose to ensure it does not slip
out of place.
 Route the condensate into the bottom drain.
10.6 Checking the condensate drain
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 via the condensate
drain hose.

14 | WPL basic | WPL S basic www.stiebel-eltron.com
INSTALLATION
Electrical connection
10.7 2. Heat source
For dual mode systems, the heat pump must always be connected
to the return of the second heat source (for example an oil boiler).
10.8 Safety temperature controller for underfloor
heating system
!
Material losses
In case of failure, in order to prevent an excessively high
flow temperature in the underfloor heating system, we
generally recommend the use of a safety temperature
controller to limit the system temperature.
11. Electrical connection
Note
Observe the heat pump manager operating and instal-
lation instructions.
Only qualified electricians may carry out the installation in accord-
ance with these instructions.
Permission to connect the appliance may need to be obtained from
your local power supply utility.
 Observe chapter “Preparing the electrical installation”.
DANGER Electrocution
Before any work, isolate the appliance from the power
supply at the control panel.
Note
The terminals are located in the appliance control panel.
1
26�03�01�1644�
2
1 Cable duct
2 Control panel
 For installation purposes, pull out the control panel forward
from the casing.
 Use appropriate cables in accordance with local regulations
for all connections.
 Check the function of the strain relief fittings.
 Connect the circulation pump for the heat utilisation side to
the heat pump manager in accordance with the technical
documents.
 For external installation, route the cables through the cable
duct provided for this purpose.
11.8.1 Electrical connection of the WPL basic (three phase)
Connection 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 cannot reach the dual mode point,
the electric emergency/booster heater ensures both
the heating operation and the provision 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)
The electric emergency/booster heater must provide
the drying heat in case of return temperatures <25°C.
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.
After expiry of the heat-up program, 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, the
emergency mode cannot be selected.
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.

www.stiebel-eltron.com WPL basic | WPL S basic | 15
INSTALLATION
Electrical connection
PE 12
26�03�01�1640�
1 Power supply (heat pump, compressor)
L1, L2, L3, N, PE
2Elect. 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
!
Damage to the appliance and environment
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.
Terminals X4, X2, control and LV
X2
X4
12
26�03�01�1641�
1 Control terminals
Power supply: L, N, PE
Control inputs:
2. Heat source
Ext. ST Stand alone operation
2 LV terminal
BUS high H
BUS low L
BUS ground “+” (not connected)
11.8.2 Electrical connection of the WPL S basic (single phase)
Connection 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 cannot reach the dual mode point,
the electric emergency/booster heater ensures both
the heating operation and the provision 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)
The electric emergency/booster heater must provide
the drying heat in case of return temperatures <25°C.
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.
After expiry of the heat-up program, 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, the
emergency mode cannot be selected.
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.

16 | WPL basic | WPL S basic www.stiebel-eltron.com
INSTALLATION
Electrical connection
PE 12
26�03�01�1652�
1 Power supply (heat pump, compressor)
L, N, PE
2Elect. booster heater (DHC)
L, L´, N, PE
Connected load Terminal assignment
3.0 kW L N PE
3.2 kW L´ NPE
6.2 kW L L´ NPE
 Cover and seal the mains terminal (X3) when all electric ca-
bles have been connected.
Terminals X4, X2, control and LV
X2
X4
12
26�03�01�1651�
1 Control terminals
Power supply: L, N, PE
Control inputs:
2. Heat source
Ext. ST Stand alone operation
2 LV terminal
BUS high H
BUS low L
BUS ground
BUS “+” (not connected)
11.1 Fitting casing components
11.1.1 Fitting the casing components for the standard external
installation
2
13
1
4
26�03�01�0929
1 Side panel
2 Cover
3 Front panel
4 Back panel

www.stiebel-eltron.com WPL basic | WPL S basic | 17
INSTALLATION
Electrical connection
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.
 Position the cover on the appliance, and secure it with two
screws.
 Hook the side panels and front and back doors onto the
standard appliance. Secure these with a screw each.
 Affix the type plate supplied to the front at the top in a clearly
visible location on the r.h. or l.h. side panel of the appliance.
11.1.2 Fitting the casing components for the basic external
installation
2
13
4
5
26�03�01�1637�
1 Side panel, r.h.
2 Cover
3 Front panel
4 Side panel, l.h.
5 Back panel
 Hook the side panels into the hooks provided on the standard
appliance and secure them with one screw each.
!
Material losses
The cover protects the PCB from water ingress.
 Install the cover with the drip edge above the PCB.
 Position the cover on the appliance, and secure it with four
screws.
 Hook the front and back panels into the hooks provided on
the standard appliance and secure them with one screw
each.
 Affix the type plate supplied to the front at the top in a clearly
visible location on the r.h. or l.h. side panel of the appliance.
11.1.3 Fitting the casing components for internal installation
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 l.h. side. The fabric tape is supplied with the accessory
“thermally insulated air hose”.
26�03�01�1454

18 | WPL basic | WPL S basic www.stiebel-eltron.com
INSTALLATION
Electrical connection
 Hang the film 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 film.
 Secure the plastic film by pressing it onto the appliance.
 Seal the gaps around the hooks with fabric tape.
Fitting casing components
2
13
1
4
26�03�01�1443
1 Side panel
2 Cover
3 Front panel
4 Back panel
 Position the cover on the appliance, and secure it with two
screws.
 Hook the side panels and front and back doors onto the
standard appliance. Secure these with a screw each.
 Affix the type plate supplied to the front at the top in a clearly
visible location on the r.h. or l.h. side panel of the appliance.
11.2 Routing air hoses
Note
In the case of heat pumps installed indoors, if a blower
door test to EN 13829 is to be carried out, then all aper-
tures which are purposely provided in the building en-
velope must be closed or sealed off before the air hoses
are installed.
 For the blower door test, seal off the heat pump’s
supply air and extract air ducts.
You can extend the air hoses by unwinding the coils. There should
be an overlap of approx. 30 cm. The total length of hoses on the
air intake and discharge side 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 line of the
hose).
 Cut to size using a sharp knife. The Bowden core can be cut
with wire cutters.
 Secure the air hose at approx. 1 m intervals. This prevents
the hose from sagging because of its flexibility.
 Match the air hose ends to the shape of the oval connectors
on the cover and the hose connection plates. The hose con-
nection plates are available as accessories.
2
3
1
2
4
26�03�01�0930�
1 Hose connection plate
2 Hose clip (oval)
3 Air hose
4 Cover
Hose connection plate dimensions
1173
778
302
687
D0000017278

www.stiebel-eltron.com WPL basic | WPL S basic | 19
INSTALLATION
Electrical connection
!
Damage to the appliance and environment
In any case, cover the external apertures with a wire
mesh. Secure the hoses against slippage.
11.3 Fitting air hoses
The example below shows the air hose connection being fitted.
26�03�01�1446
 Firstly, push the outer hose slightly upwards.
26�03�01�1447
 Push the inner hose halfway over the connector.
26�03�01�1448
 Seal the inner hose by affixing it to the connector using the
fabric tape provided.
26�03�01�1449
 Place the sealing strip provided around the connector.
26�03�01�1450
 Pull the outer hose over the connector.
26�03�01�1452
 Secure the hose using the oval hose clip provided.
26�03�01�1453
11.4 Thermally insulating the wall outlets
Cold bridges must not be able to form between the wall outlets to
be created on site and the brickwork. Provide suitable insulation
between the wall outlets and the brickwork to prevent condensate
from forming in the brickwork.
As an alternative you could also use the thermally insulated AWG
560 wall outlet. The AWG 560 wall outlet is available as an ac-
cessory.

20 | WPL basic | WPL S basic www.stiebel-eltron.com
INSTALLATION
Commissioning
12. 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 heat pump manager is required to operate the appliance. All
necessary adjustments prior to and during operation are made
on this unit.
Only heating contractors may carry out the adjustments on the
heat pump manager commissioning report, commission the ap-
pliance and instruct the owner in its use.
Commissioning is to be carried out in accordance with these instal-
lation instructions and the operating and installation instructions
of the heat pump manager. Our customer service can assist in the
commissioning, which is chargeable.
Where this appliance is intended for commercial use, the rules of
the relevant Health & Safety at Work Act may be applicable for
commissioning. For further details, check with your local author-
ising body.
12.1 Checks before commissioning
Before commissioning, check the following points:
12.1.1 Heating system
- Have you filled the heating system to the correct pressure,
and opened the quick-acting air vent valve?
12.1.2 Temperature sensor
- Have you correctly located and connected the outside tem-
perature sensor and the external return temperature sensor
(in conjunction with a buffer cylinder)?
12.1.3 Power supply
- Have you correctly connected the power supply?
-
12.1.4 High limit safety cut-out
In ambient temperatures of below -15 °C it is possible that the high
limit safety cut-out of the electrical emergency/booster heater
may trip.
 Check whether the high limit safety cut-out has tripped.
26�03�01�1023�
1
2
1 High limit safety cut-out reset button
2 Electric emergency/booster heater
 Reset the high limit safety cut-out by pressing the reset
button.
12.2 Commissioning
12.2.1 DIP switch (“WP-Typ”)
 Open the control panel.
 The IWS is located on the r.h. side.
BA
BA
26�03�01�0921�
3
4
1
2
1 LEDs
2 DIP switch (WP-Typ)
3 Reset button
4 DIP switch (BA)
With the DIP switch (“WP-Typ”), you can select the various heat
pump types on the IWS.