STIEBEL ELTRON WPL 47 Specification sheet

OPERATION AND INSTALLATION
Air source heat pump
» WPL 47
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TABLE OF CONTENTS
SPECIAL INFORMATION
OPERATION
1. General information �����������������������������������������4
1.1 Other applicable documents ���������������������������������� 4
1.2 Safety instructions����������������������������������������������� 4
1.3 Other symbols in this documentation ����������������������� 4
1.4 Units of measurement ������������������������������������������ 4
1.5 Standardised output data �������������������������������������� 4
2. Safety����������������������������������������������������������5
2.1 Intended use������������������������������������������������������ 5
2.2 Safety instructions����������������������������������������������� 5
3. Appliance description ���������������������������������������5
3.1 Properties ��������������������������������������������������������� 5
3.2 Function ����������������������������������������������������������� 5
4. Operation �����������������������������������������������������5
5. Maintenance and care ���������������������������������������6
6. Troubleshooting ����������������������������������������������6
INSTALLATION
7. Safety����������������������������������������������������������7
7.1 General safety instructions ������������������������������������ 7
7.2 Instructions, standards and regulations �������������������� 7
8. Appliance description ���������������������������������������7
8.1 Standard delivery������������������������������������������������ 7
8.2 Required accessories ������������������������������������������� 7
8.3 Additional accessories ������������������������������������������ 7
9. Preparation ���������������������������������������������������7
9.1 Sound emissions������������������������������������������������� 7
9.2 Minimum clearances�������������������������������������������� 7
9.3 Preparation of the installation site��������������������������� 8
9.4 WPM heat pump manager ������������������������������������� 9
9.5 Buffer cylinder ��������������������������������������������������� 9
9.6 Preparing the electrical installation ������������������������� 9
10. Installation�������������������������������������������������� 10
10.1 Transport ��������������������������������������������������������� 10
10.2 Siting �������������������������������������������������������������� 10
10.3 Heating water connection������������������������������������� 10
10.4 Oxygen diffusion������������������������������������������������ 10
10.5 Filling the heating system ������������������������������������ 11
10.6 Minimum flow rate ��������������������������������������������� 11
10.7 Condensate drain ����������������������������������������������� 11
10.8 External second heat generator ����������������������������� 11
10.9 High limit safety cut-out for area heating system�������� 11
11. Electrical connection��������������������������������������� 12
11.1 General ����������������������������������������������������������� 12
11.2 Terminal box����������������������������������������������������� 12
11.3 Electrical connections������������������������������������������ 13
12. Fitting casing parts ���������������������������������������� 13
13. Commissioning ��������������������������������������������� 15
13.1 Checks before commissioning�������������������������������� 15
14. Settings ����������������������������������������������������� 15
14.1 Heating curve adjustment ������������������������������������ 15
14.2 Reduced night mode (Silent mode) ������������������������� 16
14.3 Other settings ��������������������������������������������������� 16
15. Appliance handover���������������������������������������� 16
16. Shutting down the system �������������������������������� 17
16.1 Standby mode ��������������������������������������������������� 17
16.2 Power interruption ��������������������������������������������� 17
17. Troubleshooting �������������������������������������������� 17
17.1 Checking the IWS DIP switch settings ���������������������� 17
17.2 LEDs ��������������������������������������������������������������� 18
17.3 Reset button ����������������������������������������������������� 18
17.4 Fan noise ��������������������������������������������������������� 18
18. Maintenance ������������������������������������������������ 18
19. Specification ������������������������������������������������ 19
19.1 Dimensions and connections ��������������������������������� 19
19.2 Wiring diagram WPL 47 ��������������������������������������� 20
19.3 Wiring diagram WPL 57 ��������������������������������������� 22
19.4 Output diagrams WPL 47 �������������������������������������� 24
19.5 Output diagrams WPL 57 �������������������������������������� 26
19.6 Data table �������������������������������������������������������� 28
GUARANTEE
ENVIRONMENT AND RECYCLING

SPECIAL INFORMATION
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SPECIAL INFORMATION
- The appliance may be used by children over 8
years of age and persons with reduced physical,
sensory or mental capabilities or a lack of ex-
perience 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. Cleaning and user maintenance
must not be carried out by children without
supervision.
- 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.
- In dual mode operation, return water from the
second heat generator may flow through the heat
pump. Please note that the return water tempera-
ture may be a maximum of 60°C.
- Maintenance work, such as checking the electri-
cal safety, must only be carried out by a qualified
contractor.
- We recommend a regular inspection (to establish
the current condition of the system), and main-
tenance by a qualified contractor if required (to
return the system to its intended condition).
- Keep the air discharge and inlet apertures free
from snow and leaves.
- Check regularly whether water collects beneath
the appliance.
- Ensure that the refrigerant circuit is tested once a
year for leaks, in accordance with EC DIRECTIVE
517/2014. The tightness test must be documented
in the log.
- 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.
- There is no need to shut the system down in
summer. The heat pump manager has an auto-
matic summer / winter changeover.
- If the heat pump is completely switched OFF and
there is a risk of frost, drain the system on the
water side.

OPERATION
General information
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OPERATION
1. General information
The chapters "Special information" and "Operation" are intended
for appliance 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 these instructions to a new user if required.
1.1 Other applicable documents
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.
f 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.
1.3 Other symbols in this documentation
Note
General information is identified by the adjacent symbol.
f Read these texts carefully.
Symbol Meaning
Material losses
(appliance damage, consequential losses and environmen-
tal pollution)
Appliance disposal
f 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 datasheet has been determined in line with the test
conditions specified in the standard shown in the heading of this
chapter.
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
the selected method deviates from the conditions specified in the
standard shown in the heading of this chapter, 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 conditions applicable to the relevant test match those of the
standard shown in the heading of this chapter.
!
!

OPERATION
Safety
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2. Safety
2.1 Intended use
This appliance is intended for central heating and DHW heating in
domestic applications. It can be used safely by untrained persons.
The appliance can also be used in non-domestic 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 inappropri-
ate. Observation of these instructions and of instructions for any
accessories used is also part of the correct use of this appliance.
Observe the application limits (see chapter “Specification / Data
table”).
2.2 Safety instructions
Observe the following safety instructions and regulations.
- Only qualified contractors may carry out the electrical work
and installation of this appliance.
- 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 ingress 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. Cleaning and user maintenance must
not be carried out by children without supervision.
!
WARNING Injury
f For safety reasons, only operate the appliance with
the casing closed.
3. Appliance description
3.1 Properties
This appliance is a heat pump designed for outdoor installation.
Heat is extracted from the outdoor air at a low temperature level,
and is then transferred to the heating water at a higher temperature.
The heating water can be heated up to a flow temperature of 60 °C.
Operational characteristics:
- Suitable for underfloor and radiator heating systems.
- Heat pump operates most efficiently on a low-temperature
heating system.
- Still extracts heat from the outdoor air at - 20 °C outside
temperature.
- Corrosion-protected, external casing made from galvanised
sheet steel plus powder-coated finish.
- Comprises all components and safety equipment required for
operation.
- Filled with non-combustible safety refrigerant.
Note
For centralised control of the heating system, you would
need the WPM heat pump manager.
Note
The WPL 57 features a silent mode. Silent mode enables
the heat pump noise emissions to be reduced.
- Silent program 1 reduces the fan speed.
- Silent program 2 switches the heat pump off.
Heating will [then] be provided by the internal or
external second heat source. This results in higher
electricity bills.
f Where required, set silent mode in the heat pump
manager.
3.2 Function
Heat is extracted from the outdoor air via the heat exchanger
(evaporator) on the air side. The now evaporated refrigerant is
compressed with a compressor. This process requires electrical
energy. At this point, the refrigerant is at a higher temperature
level. A further heat exchanger (condenser) transfers the heat to
the heating circuit. The refrigerant then expands again and the
cycle restarts from the beginning.
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 water temperature may be a maxi-
mum of 60°C.
4. Operation
Operation is exclusively controlled via the heat pump manager.
f Please observe the instructions for the heat pump manager.

OPERATION
Maintenance and care
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5. Maintenance and care
!
Material losses
Maintenance work, such as checking the electrical safety,
must only be carried out by a qualified contractor.
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 intended condition).
f A damp cloth is sufficient for cleaning all plastic and sheet
metal parts. Never use abrasive or corrosive cleaning agents.
Note
Keep the air discharge and intake apertures free from
snow and leaves.
f Check regularly whether water collects beneath the appli-
ance.
f In the event of water collecting beneath the appliance, call
a qualified contractor to have the condensate drain cleaned
out.
Note
Once per year, the refrigerant circuit must be tested for
leaks in accordance with the EC Directive 517/2014.
The tightness test must be documented in the log.
6. Troubleshooting
Fault Cause Remedy
There is no hot
water or the
heating system
remains cold.
No power at the appliance. Check the fuses/ MCBs
in your fuse box/ distri-
bution board. Replace
the fuses/reset the MCBs
if required. Notify your
qualified contractor if
the fuses/MCBs blow/
trip again after switch-
ing the system back on.
Water is leaking
from the appli-
ance.
The condensate drain may be
blocked.
Call your qualified con-
tractor to have the con-
densate drain cleaned
out.
The heater gets
warm, but the
rooms are not
heated to the
required temper-
ature.
The dual mode temperature is set
too low.
Increase the dual mode
temperature to e.g. 0°C.
The building is a new build and is
in the screed drying phase.
Increase the dual mode
temperature to +5°C.
After 1 to 2 years the
dual mode temperature
can be reset to e.g.
-3°C.
Condensate is
collecting on the
outside of the ap-
pliance.
The heat pump is extracting
heat from the outdoor air to heat
the building. This can cause the
humidity in the outdoor air to
accumulate as dew or frost on the
cooled heat pump casing. This is
not a defect.
Fault Cause Remedy
The fan runs when
the compressor is
switched OFF.
At outside temperatures below
10°C, the fan is regularly started
at the lowest speed when the
compressor is idle. This prevents
the evaporator and fan from
freezing or icing up due to water
draining off. At temperatures
above the freezing point, the
time between two defrost cycles
is increased, thereby improving
overall efficiency.
The appliance
produces rhythmic
scraping or grind-
ing noises.
Ice has formed on the air grille,
on the fan blades or in the air
routing.
Call your qualified
contractor (see chapter
"Installation/ Trouble-
shooting/ Fan noise").
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 seri-
al number from the type plate (000000-0000-000000). The type
plate is located at the front top, on the right or left-hand side of
the casing.
Example
Montageanweisung beachten! Dichtheit geprüft! Made in Germany
*xxxxxxxxxxxxxxxxxx*
26�03�01�1430
1
1 Number on the type plate

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.
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 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.
8.1 Standard delivery
The casing components for the appliance are delivered in a sep-
arate pack.
8.1.1 Base unit
- Logbook
- Type plate
- Condensate drain hose
- Wiring diagram
8.1.2 Casing parts
- 2 Covers
- 4 Air deflector hoods
- 1 Front panel
- 1 Back panel
- 4 Side panels
- 4 Plinth trim
8.2 Required accessories
You require the following accessories to operate the heat pump:
- WPM heat pump manager
- Remote control for heating systems FE7
- Buffer cylinder
- Circulation pump, UP 30/1-8 PCV
8.3 Additional accessories
- Internet Service Gateway ISG
- WPE heat pump extension
- Contact sensor
- Immersion sensor
9. Preparation
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".
- Lawn areas and shrubs help reduce the spread of noise.
- Sound propagation can also be reduced by installing closely
spaced palisade fencing around the appliance.
f Ensure that the entire appliance frame is in full contact with
the substrate. Uneven substrates can increase sound emis-
sions.
f Ensure that the air intake direction is the same as the main
wind direction. Air should not be drawn in against the wind.
f 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.
f Avoid installation on large, echoing floor areas, e.g.tiled
floors.
f Avoid installation between reflective building walls. Reflect-
ing building walls can increase the noise level.
9.2 Minimum clearances
≥500
≥1000 ≥2000 ≥500
≥500
D0000020332
f Maintain the minimum clearances to ensure trouble-free op-
eration of the appliance and facilitate maintenance work.
D0000096921
f Never install the appliance in a recess. Two sides of the ap-
pliance must remain exposed.
f 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").

INSTALLATION
Preparation
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!
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.
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.
f Ensure that the minimum air flow rate is maintained
(see chapter "Specification/ Data table").
9.3 Preparation of the installation site
!
WARNING Injury
The discharged cold air can cause condensation to be
formed in the vicinity of the air discharge.
f Ensure that no risk of slipping due to wet conditions
or ice formation occurs on adjacent footpaths and
driveways at low temperatures.
f Ensure that the substrate is level, even, solid and permanent.
f Observe chapter "Sound emissions".
f Ensure that the appliance is accessible from all sides.
f Provide a recess (space) in the base to enable supply lines to
be routed into the appliance from below.
Note
Allow the conduits for the supply lines to protrude slightly
above the foundations. Ensure that no water can enter
the conduits.
9.3.1 Installing the supply lines
!
WARNING Injury
f Seal all supply line entries into the building to en-
sure that they are watertight.
The supply lines are all electric cables plus the flow and return
lines.
- To facilitate connection to the appliance, we recommend
using flexible supply lines in the case of outdoor installation.
f Also protect all supply lines against humidity, damage and
UV radiation by means of a conduit.
f Use only weatherproof cables, e.g. NYY.
f Protect the flow and return lines against frost with sufficient
thermal insulation. The thermal insulation must be at least
twice as thick as the diameter of the pipe. Provide thermal
insulation in accordance with applicable regulations.
f Protect all pipe fixings and external wall ducts with anti-vi-
bration insulation.
Note
When routing the condensate hose, observe chapter "In-
stallation/ Condensate drain".
9.3.2 Foundations with recess
4
1
2
3
2200
360
173255
1150
440
5
155
260
e01 e02
D0000026155
1 Air discharge
2 Air intake
3 Main wind direction
4 Entry supply lines
5 Knock-out inside the appliance
e01 "Heating flow" connection
e02 "Heating return" connection

INSTALLATION
Preparation
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A
5
8
12
7
6
4
3
≥10
D0000022105
A Depth of frost line
1 Heating flow
2 Heating return
3 Conduit for supply lines/cables
4 Foundation
5 Coarse gravel soakaway
6 Condensate drain conduit
7 Condensate drain
8 Electrical power cable
250105
D0000048227
1
2
1 Heating flow
2 Heating return
9.4 WPM heat pump manager
A WPM heat pump manager is required to operate the appliance.
This controls the entire heating system.
f Observe the WPM installation instructions during installation.
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.
9.6 Preparing the electrical installation
WARNING Electrocution
Carry out all electrical connection and installation work
in accordance with national and regional regulations.
WARNING Electrocution
The connection to the power supply must be in the form
of a permanent connection. 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 using con-
tactors, circuit breakers, fuses/MCBs, etc.
!
Material losses
The specified voltage must match the mains power sup-
ply. Observe the type plate.
!
Material losses
Provide common fuses/MCBs for the appliance control
cable and the heat pump manager.
!
Material losses
Provide separate fuses for the two power circuits of the
appliance and the control unit.
f Use cables with the relevant cross-sections. Observe the ap-
plicable national and regional regulations.
Fuse protec-
tion
Assignment Cable cross-section
B 16A Control 1.5mm²
C 32 A Compressor 10.0 mm² when routing in a wall.
6.0 mm² when routing a multi-core line on a
wall or in an electrical conduit on a wall.
The electrical specifications are given in the “Data table”. You
require aJ-Y(St)2x2x0.8mm² cable for the BUS.

INSTALLATION
Installation
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10. Installation
10.1 Transport
f When transporting the appliance, be aware of its centre of
gravity.
The centre of gravity is in the area where the compressor is lo-
cated.
f Protect the appliance against heavy impact during transport.
Where space is restricted, you can also tilt the appliance at an
angle to move it.
D0000071298
- If the appliance needs to be tilted during transport, this must
only be for a short time and it must only be tilted 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 inside the system.
f Wait approximately 30minutes before starting the appliance
after it has been tilted.
10.2 Siting
f Pay attention to the air discharge direction.
f Position the appliance on the prepared substrate.
f Level the appliance horizontally by adjusting the feet.
f Route the water pipes and electrical cables into the appliance
from below through the knock-outs in the base.
Note
Do not fit the casing components until the electrical and
hydraulic connections have been made.
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 guide.
f Install a filling nozzle on site.
f 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.
f Connect the heat pump on the heating water side. Check for
leaks.
f Ensure that the heating flow and return are connected cor-
rectly.
f Provide thermal insulation in accordance with applicable
regulations.
f 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.
10.4 Oxygen diffusion
!
Material losses
Do not use open vented heating systems. Use oxygen
diffusion-proof pipes in underfloor heating systems with
plastic pipework.
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).
f 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.

INSTALLATION
Installation
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10.5 Filling the heating system
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.
f 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 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 apply as for desalination.
f Fill the heating system via the filling nozzle installed on site.
f After filling the heating system, check the connections for
leaks.
10.5.1 Venting the heating system
f Vent the pipework carefully. For this, also activate the air
vent valve integrated into the heating flow inside the heat
pump.
10.6 Minimum flow rate
The minimum flow rate is set via the temperature differential of
the buffer circuit.
f Set the buffer charging pump so that the value is equal to or
lower than the maximum temperature differential. See the
chart “Maximum temperature differential on the heating side
with buffer cylinder”.
You can set the flow rate in heat pump mode. In order to do this,
firstly make the following settings:
f Temporarily remove the fuse from the electric emergency/
auxiliary heater to isolate the emergency/auxiliary heater
from the power supply. Alternatively, switch OFF the second
heat generator.
f Operate the appliance in heating mode.
f In the menu “SETTINGS/ HEATING/ STANDARD SETTING”,
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]
f Make the settings at the circulation pump when the temper-
ature differential between the flow and return temperature
has stabilised.
f Compare the resulting temperature differential between the
flow and return at the appliance with the diagram “Maximum
temperature differential on the heating side with buffer cyl-
inder”.
f Set the buffer charging pump so that the maximum tempera-
ture differential is achieved or undershot.
f If the appliance will be used for DHW heating, check the set-
ting of the pump head in DHW mode.
f If necessary, adjust the delivery head setting for the DHW
primary pump.
f Set the buffer charging pump and the DHW primary pump to
∆p constant.
10.7 Condensate drain
A pipe for the condensate drain is fitted at the factory to the defrost
pan. The pipe terminates near the aperture on the floor plate. The
appliance is supplied with a two meter hose with elbow plug-in
fittings for draining the condensate.
f Secure the hose supplied on the pipe of the defrost pan.
10.8 External second heat generator
For dual mode systems, always connect the heat pump into the
return of the second heat generator (e.g. oil boiler).
10.9 High limit safety cut-out for area heating
system
!
Material losses
In order to prevent excessively high flow temperatures
in the area heating system causing damage in the event
of a fault, install a high limit safety cut-out to limit the
system temperature.

INSTALLATION
Electrical connection
12 | WPL 47 | WPL 57 www.stiebel-eltron.com
11. Electrical connection
11.1 General
Note
The leakage current of this appliance can be >3.5mA.
Since the unit is connected to the distribution board, the
leakage current from the unit and the residual currents
of the installation are recorded together during a residual
current test.
f Evaluate the percentage of leakage current from the
unit and the residual currents in the test result.
f Take into account the local and unit-specific condi-
tions at the test location, as well as any insulation
faults or other influencing factors.
Note
Please observe the instructions for the heat pump man-
ager.
The connection must only be made by a qualified contractor and
in accordance with these instructions.
Permission to connect the appliance may need to be obtained from
your local power supply utility.
11.2 Terminal box
WARNING Electrocution
Before working on the appliance, isolate it from the
power supply at the control panel.
The terminal box is located on the air outlet side.
f Open the junction box as shown:
26�03�01�1412
Note
The wiring diagram of the appliance is located behind
the cover.
Use appropriate cables in accordance with local regulations for
all connections.
f Route the cables through the knock-out in the floor, through
the cable trunking and upwards into the junction box.
f Route the electrical cables through the cable entries with
strain reliefs.
f Check that the strain relief fittings are working as intended.
f Connect the circulation pumps for the heating and buffer
cylinder to the heat pump manager in accordance with the
engineering documents.

INSTALLATION
Fitting casing parts
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11.3 Electrical connections
X2 X3
X4
26�03�01�1419
X3 Compressor (HP)
L1, L2, L3, N, PE Power supply
X2 Safety extra low voltage
H Bus high
L BUS Low
⊥Bus earth
+ BUS (is not connected)
X4 Control voltage
L, N, PE Power supply
ERR Output signal fault
Note
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.
A message is displayed on the heat pump manager.
f In this case, change the direction of the rotating field
by swapping two of the phases.
Note
The "ERR" output issues a 230V signal for every appliance
fault. The output passes the signal on to the external
controller.
In the case of temporary faults, the output switches the
signal through for a specific time.
In the case of faults that result in a permanent appliance
shutdown, the output switches through permanently.
12. Fitting casing parts
Four screws are available at the top of the frame to affix the hoods.
Eight screws are available to affix the reversing hoods.
f Remove the 12 fixing screws from the frame of the standard
appliance and retain them.
f Place the hoods at the front of the appliance and push them
to the centre. Ensure that the tabs of the lid click into the
guides on the casing.
f Secure the hoods with two screws each.
26�03�01�1413
f Hook the lower side panels into the mounting brackets on
the appliance. Simultaneously insert the tabs fixed to the
bottom of the side panels into the slots provided in the appli-
ance frame.

INSTALLATION
Fitting casing parts
14 | WPL 47 | WPL 57 www.stiebel-eltron.com
D0000032213
f Hook the reversing hoods into the mounting brackets at the
top and bottom.
26�03�01�1415
f Secure the reversing hoods with two screws each.
26�03�01�1421
f Hook the front and back panels into the mounting brackets of
the hoods. Simultaneously insert the tabs fixed to the bottom
of the panels into the slots provided in the appliance frame.
f Secure the front and back panels using the mounting tabs
provided for this purpose at the bottom of the appliance
frame.
26�03�01�1416
f Secure the side plinth trims by hooking into the appliance
frame.
f Secure the front and back plinth trims by hooking into the
side plinth trims.

INSTALLATION
Commissioning
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f Affix the type plate supplied at the top of the front or rear
casing panel, where it is clearly visible.
26�03�01�1417
13. Commissioning
A WPM heat pump manager is required to operate the appliance.
All necessary adjustments prior to and during operation are made
on this device.
Only heating contractors may carry out the adjustments on the
heat pump manager commissioning list, commission the appliance
and instruct the owner in its use.
Commission the appliance in accordance with these operating and
installation instructions and the instructions for the heat pump
manager. Our customer support can assist with commissioning,
which is a chargeable service.
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 your local authorising
body.
13.1 Checks before commissioning
f Before commissioning check the points detailed below.
13.1.1 Heating system
- Have you filled the heating system to the correct pressure,
and opened the quick-action air vent valve?
13.1.2 Temperature sensors
- Have you correctly connected and positioned the outside
temperature sensor and the return sensor?
13.1.3 Power supply
- Have you correctly connected the power supply?
14. Settings
14.1 Heating curve adjustment
The efficiency of a heat pump decreases as the flow temperature
rises. The heating curve should therefore be adjusted with care.
Heating curves that are set too high cause the zone valves or ther-
mostatic valves to close, which may lead to the minimum flow rate
required for the heating circuit not being achieved.
f Observe the instructions for the WPM.
The following steps will help you to adjust the heating curve cor-
rectly:
- Fully open thermostatic or zone valves in a lead room (e.g.
living room and bathroom).
We do not recommend installing thermostatic or zone valves
in the lead room. Control the temperature for these rooms
via a remote control.
- At different outside temperatures (e.g. -10°C and +10°C),
adjust the heating curve so that the required temperature is
achieved in the lead room.
Standard values to begin with:
Parameter Underfloor heating Radiator heating
system
Heating curve 0.4 0.8
Control dynamic 10 10
Comfort temperature 20°C 20°C
If the room temperature is too low in spring and autumn (ap-
prox. 10°C outside temperature), go to heat pump manager menu
SETTINGS / HEATING / HEATING CIRCUIT and raise the parameter
COMFORT TEMPERATURE”.
Note
If no remote control is installed, raising the "COMFORT
TEMPERATURE" parameter will lead to a parallel offset
of the heating curve.
If the room temperature is too low at low outside temperatures,
increase parameter "HEATING CURVE".
If the "HEATING CURVE" parameter has been raised and outside
temperatures relatively high, adjust the zone valve or thermostatic
valve in the lead room to the required temperature.

INSTALLATION
Appliance handover
16 | WPL 47 | WPL 57 www.stiebel-eltron.com
Note
Never reduce the temperature in the entire building by
closing all zone or thermostatic valves; instead use the
setback programs.
When everything has been implemented correctly, the system
can be heated to its maximum operating temperature and vented
once again.
!
Material losses
For underfloor heating systems, observe the maximum
permissible system temperature for that particular un-
derfloor heating.
14.2 Reduced night mode (Silent mode)
Note
The WPL 57 features a silent mode. Silent mode enables
the heat pump noise emissions to be reduced.
f Look up the sound power level in the data table (see chapter
"Specification / Data table").
To reduce the sound power level of the appliance for a specified
period, you can set the appliance to night mode if required.
You can specify the times during which the appliance is set to night
mode using the time programs.
Parameter Meaning
PROGRAMS (SILENT PROGRAM 1) reduced night mode
PROGRAMS (SILENT PROGRAM 2) Appliance switched off
Two versions of night mode are available for you to use.
Version 1: reduced night mode
You can reduce the sound power level of the appliance through
the fan. If the emergency/auxiliary heater cuts in, this will result
in higher running costs.
Version 2: appliance switched off
You can switch the appliance off. If the appliance is switched off,
central heating and DHW heating will be supplied solely through
the emergency/auxiliary heater. If the emergency/auxiliary heater
cuts in, this will result in higher running costs.
14.2.1 Reduced night mode
Note
When reduced night mode is active, this may result in
higher running costs.
Meaning
max. reduced night mode The fan speed cannot be reduced any
further.
f Reduce the fan speed in the heat pump manager.
Parameter
FAN REDUCTION (COMMISSIONING/ SILENT MODE)
14.2.2 Appliance switched off
Note
If the appliance is switched off, central heating and DHW
heating will be supplied solely through the emergency/
auxiliary heater. This will result in higher running costs.
f Switch the appliance off in the heat pump manager.
Parameter
HEAT PUMP OFF (COMMISSIONING/ SILENT MODE)
14.3 Other settings
f For operation with a buffer cylinder, see chapter “Operation/
Menu/ Menu description/ SETTINGS/ STANDARD SETTING/
BUFFER OPERATION” in the WPM commissioning instruc-
tions.
Using the heat-up program
If you use the heat-up program, make the following settings on
the WPM:
f Initially set the "DUAL MODE TEMP HZG" parameter to 30°C.
f Then set the "LOWER APP LIMIT HZG" parameter to 30°C.
Note
After completing the heat-up process, reset the "DUAL
MODE TEMP HZG" and "LOWER APPLIMIT HZG" parame-
ters to their respective standard values or to the respec-
tive system values.
15. Appliance handover
Explain the appliance function to users and familiarise them with
how it works.
Note
Hand over these operating and installation instructions
to users for safekeeping.
All information in these instructions must be closely ob-
served. The instructions provide information on safety,
operation, installation and maintenance of the appliance.

INSTALLATION
Shutting down the system
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16. Shutting down the system
!
Material losses
Never interrupt the heat pump power supply, even out-
side of the heating season. Otherwise, system frost pro-
tection is not guaranteed.
The heat pump manager automatically switches the heat
pump to summer or winter mode.
16.1 Standby mode
To shut the system down, simply set the heat pump manager to
"Standby mode". This way, the safety functions that protect the
system remain enabled, e.g. frost protection.
16.2 Power interruption
If the system is to be isolated from the power supply permanently,
please observe the following:
!
Material losses
If the heat pump is completely switched OFF and there is
a risk of frost, drain the system on the water side.
17. Troubleshooting
WARNING Electrocution
Before removing the casing components, disconnect all
poles from the power supply.
Note
Observe the instructions for the heat pump manager.
If the fault cannot be located during a service using the heat pump
manager, open the control panel in emergencies and check the
IWS settings.
17.1 Checking the IWS DIP switch settings
f Open the control panel.
26�03�01�1438
IWS
2
1
BA
BA
26�03�01�0921
4
3
1 LEDs
2 Reset button
3 DIP switch (WP-Typ)
4 DIP switch (BA)
DIP switch (WP-Typ)
The DIP switch (WP-Typ) on the IWS serves to set the relevant
heat pump type.
WP - Typ
ON
1234
D0000057055
f Check whether the DIP switch is set correctly.
DIP switch (BA)
The heat pump operating mode is set using the DIP switch (BA).
BA
ON
1234
D0000057050
f Check whether the DIP switch is set correctly.

INSTALLATION
Maintenance
18 | WPL 47 | WPL 57 www.stiebel-eltron.com
17.2 LEDs
Red LED
Fault Cause Remedy
The appliance shuts
down for 12 minutes and
then restarts. Red LED
flashes.
Heat pump fault. Check the fault message
in the WPM. Find the
solution in the WPM in-
structions (fault list). Per-
form a reset of the IWS
(see WPM instructions).
Appliance stops perma-
nently. Red LED illumi-
nates.
Five faults within two
hours.
Check the fault message
in the WPM. Find the
solution in the WPM in-
structions (fault list). Per-
form a reset of the IWS
(see WPM instructions).
Green LED centre
The LED flashes during initialisation and illuminates constantly
after the bus address has been assigned successfully. Only then
has communication with the WPM been established.
17.3 Reset button
If the IWS was incorrectly initialised, the settings can be reset
with this button.
f For this, also observe chapter "Reinitialising the IWS" in the
heat pump manager operating and installation instructions.
17.4 Fan noise
The heat pump draws heat from the outdoor air. This causes the
outdoor air to cool down. At outside temperatures of 0°C to 8°C,
the air may be cooled to below freezing point. If under these
conditions precipitation occurs in the form of rain or fog, ice may
form on the air grille, the fan blades or the airways. If the fan
comes into contact with this ice, this creates noise.
How to remedy rhythmic scratching or grinding noises:
f Check whether the condensate drain is clear of obstructions.
f Carry out a manual defrost, as many times as necessary,
until the fan runs freely again.
f At outside temperatures above +1°C, shut down the appli-
ance or switch it over to emergency mode for approx.1hour.
After this, the ice should have melted.
f Check that the appliance is installed in line with the installa-
tion requirements.
f If the noises occur frequently, notify customer support.
18. Maintenance
WARNING Electrocution
Prior to maintenance and cleaning work, isolate the ap-
pliance from its power supply.
We recommend a regular inspection (to establish the current con-
dition of the system), and maintenance if required (to return the
system to its original condition).
Cleaning the condensate drain
Environmental conditions may result in the condensate drain be-
coming blocked. To clean the drain, proceed as follows:
f Remove casing panels (see chapter “Installation”).
f Check the hose and the pipe of the condensate drain.
f Remove dirt and blockages immediately.
f Refit the casing parts on the appliance (see chapter “Instal-
lation”).

INSTALLATION
Specication
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19. Specification
19.1 Dimensions and connections
g01 g02
i21 i21
D0000016788
g01 Air intake
g02 Air discharge
i21 Entry supply line

INSTALLATION
Specication
20 | WPL 47 | WPL 57 www.stiebel-eltron.com
19.2 Wiring diagram WPL 47
1
2
3
4
X1
A2
X29
X36
X35
X30
X34
X33
Y1
p >
3
2
N2 F2
F8
> p
X31
E2E3
1
2143
2
B5
T
B6
T
B7
T
B8
T
B2
T
X4
X2
1 2 3 4 5 6
ERR L N PE
M6
M
1~
A2 A1
K1.1
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
H L +
1 2 3 4
X38
3
2
1
X62
3
2
1
6
5
4
3
2
1
3
2
1
7
6
5
4
3
2
1
5
4
3
2
1
3 2 1
p
P3
3 2 1
p
P1 B10
T
B9
T
B1
T
N
L
PE
M6
M
1~
N
L
PE
PE N L3 L2 L1
4 3 2 1
M1
M
3~
531
246
K1.1
642
135
K1
531
246
K2
T1 T2 T3
X3
X32
X37
5 4 3 2 1
M8 M
X40
X40
X39
A2 A1
K1
A2 A1
K2
T1
T2
> u
M2
M1
X61
1
2
X63
3
2
1
X64
3
2
1
A3
F9 F9
A3/X60
X60
1 2
X1/1 X1/3
X32
X32
R2R3 R1
>T
F10
M7 M
26�03�01�1377
A2 Integral heat pump control unit (IWS)
A3 Fan auxiliary PCB/Expansion valves (ZPLE)
B1 Heat pump flow temperature sensor - KTY
B2 Heat pump return temperature sensor - KTY
B5 Hot gas temperature sensor - KTY
B6 Intake air temperature sensor - Pt1000
B7 Temperature sensor, compressor intake – PT 1000
B8 Evaporator discharge temperature sensor – Pt1000
B9 Frost protection temperature sensor – KTY
B10 Temperature sensor, injection – PT 1000
E2 Oil sump heater
E3 Ribbon heater
F2 High pressure switch
F8 Motor overload relay
F9 Fan fuse
F10 Temperature limiter, starting resistor
K1.1 Safety contactor
K1 Contactor - resistance start
K2 Compressor start contactor
M1 Motor, compressor
M6 Fan motor
M7 Electrical expansion valve stepper motor
M8 Electrical injection valve stepper motor
N2 Defrost differential pressure switch
P1 High pressure sensor
P3 Low pressure sensor
R1, R2, R3 Starting resistors
X1 Terminals
X2 Low voltage terminal strip
X3 Mains terminal
X4 Terminal, control
X29 12-pole IWS connector - control unit
X30 3-pole IWS connector - bus
X31 Oil sump heater terminal
X32 Earth support point
X33 5-pole IWS plug - electrical expansion valve
X34 7-pole IWS connector - sensors
X35 6-pole IWS connector - temperature sensors
X36 3-pole IWS connector - fan
X37 5-pole IWS plug - electrical injection valve
X38 3-pole IWS plug - DHC
X39 Pressure sensor terminal
X40 Ground temperature sensor terminal
X41 Expansion valve terminal
X60 2-pin ZPLE plug - supply voltage
X61 2-pin ZPLE plug - ground
X62 3-pin ZPLE plug - fan input
X63 3-pin ZPLE plug - fan output
X64 3-pin ZPLE plug - fan output
Y1 Diverter valve