STIEBEL ELTRON WPL 34 Instruction Manual

OPERATION AND INSTALLATION
Air | water heat pump
» WPL 34
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CONTENTS
SPECIAL INFORMATION
OPERATION
1. General information �����������������������������������������4
1.1 Safety instructions����������������������������������������������� 4
1.2 Other symbols in this documentation ����������������������� 4
1.3 Units of measurement ������������������������������������������ 4
1.4 Standardised output data �������������������������������������� 4
2. Safety����������������������������������������������������������5
2.1 Intended use������������������������������������������������������ 5
3. Appliance description ���������������������������������������5
3.1 Properties ��������������������������������������������������������� 5
3.2 Function ����������������������������������������������������������� 5
3.3 Equipment features ��������������������������������������������� 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 Further accessories���������������������������������������������� 7
8.4 System configuration ������������������������������������������� 7
9. Preparations ��������������������������������������������������7
9.1 Sound emissions������������������������������������������������� 7
9.2 Minimum clearances�������������������������������������������� 8
9.3 Substrate ���������������������������������������������������������� 8
9.4 Heat pump manager WPM������������������������������������� 9
9.5 Buffer cylinder ��������������������������������������������������� 9
9.6 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 ������������������������������������ 10
10.6 Minimum flow rate ��������������������������������������������� 10
10.7 Condensate drain ����������������������������������������������� 11
10.8 Second heat source��������������������������������������������� 11
10.9 Safety temperature controller for underfloor heating
system STB-FB �������������������������������������������������� 11
11. Power supply ����������������������������������������������� 11
11.1 General ����������������������������������������������������������� 11
11.2 Wiring chamber������������������������������������������������� 11
11.3 Electrical connections������������������������������������������ 12
12. Fitting casing components �������������������������������� 12
13. Commissioning ��������������������������������������������� 14
13.1 Checks before commissioning�������������������������������� 14
13.2 Initial start-up��������������������������������������������������� 14
13.3 Shutdown �������������������������������������������������������� 15
14. Troubleshooting �������������������������������������������� 15
14.1 Controls on the IWS �������������������������������������������� 15
14.2 Fan noise ��������������������������������������������������������� 16
15. Maintenance ������������������������������������������������ 16
16. Specification ������������������������������������������������ 17
16.1 Dimensions and connections��������������������������������� 17
16.2 Wiring diagram WPL 34 | WPL 47���������������������������� 18
16.3 Wiring diagram WPL 57 ��������������������������������������� 20
16.4 Output diagrams WPL 34 �������������������������������������� 22
16.5 Output diagrams WPL 47 �������������������������������������� 24
16.6 Output diagrams WPL 57 �������������������������������������� 26
16.7 Data table �������������������������������������������������������� 28
GUARANTEE
ENVIRONMENT AND RECYCLING

SPECIAL INFORMATION
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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 experience
and know-how, 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 ap-
pliance. Children must never clean the appliance
or perform user maintenance unless they are
supervised.
- The connection to the power supply must be in
the form of a permanent connection. Ensure the
appliance can be separated from the power sup-
ply by an isolator that disconnects all poles with
at least 3mm contact separation.
- Maintain the minimum clearances to ensure trou-
ble-free operation of the appliance and facilitate
maintenance work.
- 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 an annual inspection (to establish
the system's current condition), and maintenance
by a qualified contractor if required (to return the
system to the desired condition).
- Keep the air discharge and inlet apertures free
from snow and leaves.
- Check regularly whether water collects beneath
the appliance.
- Once per year, the refrigerant circuit must be test-
ed for leaks in accordance with the 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.

OPERATION
General information
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OPERATION
1. General information
The chapters "Special Information" and "Operation" are intended
for both the user and qualified contractors.
The chapter "Installation" is intended for qualified contractors.
Note
Read these instructions carefully before using the appli-
ance and retain them for future reference.
Pass on the instructions to a new user if required.
1.1 Safety instructions
1.1.1 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.
1.1.2 Symbols, type of risk
Symbol Type of risk
Injury
Electrocution
Burns
(burns, scalding)
1.1.3 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.
1.2 Other symbols in this documentation
Note
General information is identified by the adjacent symbol.
 Read these texts carefully.
Symbol Meaning
Material losses
(appliance damage, consequential losses and environmen-
tal pollution)
Appliance disposal
 This symbol indicates that you have to do something. The ac-
tion you need to take is described step by step.
1.3 Units of measurement
Note
All measurements are given in mm unless stated oth-
erwise.
1.4 Standardised output data
Explanations to determine and interpret the specified standardised
output data
1.4.1 Standard: EN 14511
The output data specifically mentioned in text, diagrams and
technical datasheets has been determined in line with the test
conditions described 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 described in the
standard shown in the heading of this chapter, any deviations can
have a considerable impact. Further factors that have an influence
on the test values are the measuring equipment, the system con-
figuration, 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 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 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").
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 older
and persons with reduced physical, sensory or mental
capabilities or a lack of experience and know-how, pro-
vided that they are supervised or they have been in-
structed on how to use the appliance safely and have
understood the resulting risks. Children must never play
with the appliance. Children must never clean the ap-
pliance or perform user maintenance unless they are
supervised.
!
WARNING Injury
 For safety reasons, only operate the appliance with
the casing closed.
3. Appliance description
3.1 Properties
The appliance is an air|water heat pump that operates as a heat-
ing heat pump. 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.
- Heat pump operates most efficiently on a low-temperature
heating system.
- Still extracts heat from the outdoor air at - 20 °C outside
temperature.
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.
 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. This electrical energy helps to heat the room.
At air temperatures below approx. + 7 °C, the humidity in the air
condenses as hoarfrost on the evaporator fins. Any hoarfrost is au-
tomatically defrosted. Water created from this defrosting process
collects in the defrost pan and is drained off via a hose.
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.
3.3 Equipment features
- 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.
4. Operation
Operation is exclusively controlled via the heat pump manager.
 Observe the heat pump manager operating and installation
instructions.

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 heating contractor.
We recommend an annual inspection (to establish the system's
current condition), and maintenance by a qualified contractor if
required (to return the system to the desired condition).
 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.
 Check regularly whether water collects beneath the
appliance.
 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 heat-
ing system stays
cold.
No power at the appliance. Check the fuses/MCBs in
your fuse box/distribu-
tion panel. Replace the
fuses/reset the MCBs if
required. Notify your
qualified contractor if
the fuses/MCBs blow/
trip again.
Water is leaking
from the appli-
ance.
The condensate drain may be
blocked.
Clean the condensate
drain as described in
chapter 'Care and main-
tenance'.
Condensate is
collecting on the
outside of the ap-
pliance.
The heat pump is drawing 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.
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 request, provide the 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 Standard appliance
- Logbook
- Type plate
- Condensate drain hose
- Wiring diagram
8.1.2 Casing components
- 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:
- Heat pump manager WPM 3
- Remote control for heating systems FE7
- Buffer cylinder
- Circulation pump UP30/1-8PCV
8.3 Further accessories
- Internet Service Gateway ISG
- Mixer module MSMW
- Contact sensor
- Immersion sensor
8.4 System configuration
You will find the accessory drawings and versions in the specific
technical guides for your system.
9. Preparations
9.1 Sound emissions
The appliance is louder on the air intake and air discharge sides
than on the two enclosed sides. Observe the following information
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.
 Ensure that the air intake direction is the same as the dom-
inant 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. Reflect-
ing building walls can increase the noise level.

INSTALLATION
Preparations
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9.2 Minimum clearances
≥500 ≥1000
≥500
≥500
≥500
D0000020332
 Maintain the minimum clearances to ensure trouble-free op-
eration of the appliance and facilitate maintenance work.
91�00�00�0036
 Never install the appliance in a recess. Two sides of the ap-
pliance must remain exposed.
!
Material losses
Please note that both the flow of outdoor air into the
appliance, and the flow of exhaust air from the appliance
must be unimpeded.
If the air intake and discharge of the appliance are ob-
structed by surrounding objects, this may cause a thermal
short-circuit.
 Ensure that the appliance is not fully enclosed by objects
such as buildings, walls or fences.
 If necessary, maintain a greater clearance to the surrounding
objects.
!
Material losses
The air flow rate through the appliance must not fall
below the minimum level. If the air flow rate falls below
the minimum level, trouble-free operation of the appli-
ance is not guaranteed.
 Ensure that the minimum air flow rate is maintained. Ob-
serve the details in chapter "Specification / Data table".
!
WARNING Injury
On the air discharge side, discharged air can result in the
formation of ice on footpaths and driveways in winter.
 If necessary, maintain a greater clearance to the surrounding
objects.
If the air discharge side of the appliance faces a wall of a house,
the cool air from the air discharge may cause condensate to form
on this wall.
Note
If the air discharge side faces house walls, maintain a
minimum clearance of 2m between the appliance and
the building.
9.3 Substrate
 The substrate must be horizontal, level, solid and permanent.
 Observe chapter "Sound emissions".
Note
Provide a recess (space) in the substrate to enable water
and electrical pipes/cables to be connected from below.
Example: Foundations with recess
4
1
2
3
2200
360
173255
1150
440
5
155
260
D0000026155
1 Air discharge
2 Air intake
3 Main wind direction
4 Supply line outlet
5 Knock-out inside the appliance

INSTALLATION
Preparations
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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 back filling
6 Condensate drain pipe
7 Condensate drain
8 Electrical power cable
250105
D0000048227
1
2
1 Heating flow
2 Heating return
 Protect the flow and return pipes and the electrical cables
against damage and moisture with an installation conduit.
 Protect the flow and return lines against frost with sufficient
thermal insulation. The required insulation thickness is de-
scribed in the Energy Savings Ordinance.
 Only use weather-resistant cables.
9.4 Heat pump manager WPM
A WPM heat pump manager is required to operate the appliance.
This controls the heat pump and regulates the heating system.
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 Electrical installation
WARNING Electrocution
Carry out all electrical connection and installation work
in accordance with national and regional regulations.
WARNING Electrocution
Only use a permanent connection to the power supply.
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 with contactors, circuit breakers, fuses/
MCBs, etc.
!
Material losses
The specified voltage must match the mains voltage. Ob-
serve the type plate.
In accordance with VDE 0298-4, use the following line cross-sec-
tions subject to their fuse protection:
MCB/fuse
rating
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.
Note
Provide separate fuses for the two power circuits of the
appliance and the control unit.

INSTALLATION
Installation
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10. Installation
10.1 Transport
 Pay attention to the appliance's centre of gravity when trans-
porting the appliance.
The centre of gravity is in the area where the compressor is lo-
cated.
 Protect the appliance against heavy impact during transport.
Where space is restricted, you can also tilt the appliance at an
angle to move it.
10.2 Siting
 Pay attention to the air discharge direction.
 Position the appliance on the prepared substrate.
 Level the appliance horizontally by adjusting the feet.
 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
The heating system to which the heat pump is connected must be
installed by a qualified contractor in accordance with the water
installation drawings that are part of the technical guides.
 Thoroughly flush the pipework before connecting the heat
pump.
Debris, such as welding pearls, rust, sand, sealant, etc. can impair
the operational reliability of the heat pump.
10.4 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.
10.5 Filling the heating system
10.5.1 Heating water quality
Carry out a fill water analysis before the system is filled. This may,
for example, be requested by the relevant water supply utility.
!
Material losses
To avoid damage as a result of scaling, it may be neces-
sary to soften or desalinate the fill water. Always observe
the fill water limits specified in the "Specification / Data
table" chapter.
 Recheck these limits 8-12 weeks after commission-
ing and as part of the annual system maintenance.
Note
With a conductivity >1000 μS/cm, desalination treatment
is recommended in order to avoid corrosion.
Note
Suitable appliances for water softening and desalinating,
as well as for 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.
10.5.2 Venting the heating system
 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.
Set the buffer charging pump so that the value is equal to or lower
than the maximum temperature differential.
The setting is made in heat pump mode. For this, make the fol-
lowing settings first:
 Temporarily remove the fuse from the electric emergency/
booster heater to isolate the emergency/booster heater from
the power supply. Alternatively, switch OFF the second heat
generator.
 Operate the appliance in heating mode.
10.6.1 Flow rate with buffer cylinder
When using a buffer cylinder, make the following setting: In the
menu "SETTINGS/ HEATING/ STANDARD SETTINGS", set param-
eter "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.

INSTALLATION
Power supply
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Maximum temperature differential on the heating side with buffer
cylinder:
1
0
2
4
6
8
10
-15 -10 -5 0 5 10 15 20 25 30
D0000063550
1 Nominal flow rate
X Outside temperature [°C]
Y Maximum temperature differential [K]
 Make the settings at the circulation pump when the temper-
ature differential between the flow and return temperature
has stabilised.
 Compare the resulting temperature differential between the
flow and return at the appliance with the diagram “Maxi-
mum temperature differential on the heating side with buffer
cylinder”.
 Set the buffer charging pump so that the maximum tempera-
ture differential is achieved or undershot.
 If the appliance will be used for DHW heating, check the set-
ting of the delivery head in DHW mode.
 If necessary, adjust the delivery head setting for the DHW
primary pump.
 Set the buffer charging pump and the DHW primary pump to
∆p constant.
10.7 Condensate drain
A 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.
 Secure the hose supplied on the pipe of the defrost pan.
10.8 Second heat source
For dual mode systems, always connect the heat pump into the
return of the second heat generator (e.g. oil boiler).
10.9 Safety temperature controller for underfloor
heating system STB-FB
!
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. Power supply
11.1 General
WARNING Electrocution
Before working on the appliance, isolate it from the
power supply at the control panel.
Please observe the heat pump manager operating and installation
instructions.
Only qualified electricians must carry out the installation in ac-
cordance with these instructions.
Permission to connect the appliance may need to be obtained from
your local power supply utility.
11.2 Wiring chamber
The terminal box is located on the air outlet side.
 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.
 Route the cables through the knock-out in the floor, through
the cable trunking and upwards into the junction box.
 Route the electrical cables through the cable entries with
strain reliefs.
 Check the function of the strain relief fittings.

INSTALLATION
Fitting casing components
12 | WPL 34 | WPL 47 | WPL 57 www.stiebel-eltron.com
 Connect the circulation pumps for the heating and buffer
cylinder to the heat pump manager in accordance with the
engineering documents.
11.3 Electrical connections
X2 X3
X4
26�03�01�1419
X3 Compressor (HP)
L1, L2, L3, N, PE Power supply
X2 Low voltage
H BUS High
L BUS Low
⊥BUS earth
+ BUS (is not connected)
X4 Control voltage
L, N, PE Power supply
ERR Fault output signal
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. The heat pump manager shows the fault
message "No output".
 In this case, change the direction of the rotating field
by swapping two of the phases.
Note
For every appliance fault, the "ERR" output issues a 230V
signal. The output passes the signal onto 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 components
Four screws are available at the top of the frame to affix the hoods.
Eight screws are available to affix the reversing hoods.
 Remove the 12 fixing screws from the frame of the standard
appliance and retain them.
 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.
 Secure the hoods with two screws each.
26�03�01�1413
 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 components
www.stiebel-eltron.com WPL 34 | WPL 47 | WPL 57 | 13
D0000032213
 Hook the reversing hoods into the mounting brackets at the
top and bottom.
26�03�01�1415
 Secure the reversing hoods with two screws each.
26�03�01�1421
 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.
 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
 Secure the side plinth trims by hooking into the appliance
frame.
 Secure the front and back plinth trims by hooking into the
side plinth trims.

INSTALLATION
Commissioning
14 | WPL 34 | WPL 47 | WPL 57 www.stiebel-eltron.com
 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.
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 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
 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 sensor
- 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?
13.2 Initial start-up
13.2.1 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 and
thermostatic valves to close, which may lead to the minimum flow
rate required for the heating circuit not being achieved.
 Observe the WPM operating and installation instructions.
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 remote control.
- At different outside temperatures (e.g. –10°C and +10°C),
adjust the heating curve so the required temperature is set in
the lead room.
Standard values to begin with:
Parameters Underfloor heating Radiator heating
system
Heating curve 0.4 0.8
Control response time 5 15
Comfort temperature 20°C 20°C
If the room temperature is not high enough in spring and autumn
(approx. 10 °C outside temperature), raise the "COMFORT TEM-
PERATURE" parameter in the heat pump manager menu under
"SETTINGS / HEATING / HEATING CIRCUIT".
Note
If no remote control is installed, raising the "COMFORT
TEMPERATURE" parameter leads to a parallel offset of
the heating curve.
Increase the "HEATING CURVE" parameter, if the room tempera-
ture is not high enough when outside temperatures are low.
If you raise the "HEATING CURVE" parameter, adjust the zone valve
or thermostatic valve in the lead room to the required temperature
when outside temperatures are high.

INSTALLATION
Troubleshooting
www.stiebel-eltron.com WPL 34 | WPL 47 | WPL 57 | 15
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
With underfloor heating systems, observe the maximum
permissible temperature for the system.
13.2.2 Other settings
 For operation with and without buffer cylinder, observe
chapter "Operation / Menu structure / Menu SETTINGS/
STANDARD SETTING/ BUFFER OPERATION" in the operating
and installation instructions of the WPM.
When using the heat-up program
If you use the heat-up program, make the following settings on
the WPM:
 Initially set parameter "DUAL MODE TEMP HZG" to 30°C.
 Then set parameter "LOWER APP LIMIT HZG" to 30°C.
Note
After completing the heat-up process, reset the parame-
ters "DUAL MODE TEMP HZG" and "LOWER APP LIMIT HZG"
to their respective standard values or to the respective
system values.
13.3 Shutdown
!
Material losses
Never interrupt the heat pump power supply, even out-
side the heating season. Otherwise, system frost protec-
tion is not guaranteed.
The heat pump manager automatically switches the heat
pump to summer or winter mode.
13.3.1 Standby mode
If the appliance is to be taken out of use, set the WPM to standby.
This retains the safety functions designed to protect the system
(e.g. frost protection).
13.3.2 Power interruption
If the system is permanently isolated from the power supply,
please observe the following:
!
Material losses
If the heat pump and frost protection are completely
switched off, drain the system on the water side.
14. Troubleshooting
Note
Please observe the heat pump manager operating and
installation instructions.
Note
The following inspection instructions may only be carried
out by a qualified contractor.
If you cannot locate the fault using the heat pump manager, use
the controls on the IWS.
 Open the control panel.
WARNING Electrocution
Before removing the casing components, disconnect all
poles from the power supply.
26�03�01�1438
 Read the following sections on troubleshooting and carry out
the instructions.
14.1 Controls on the IWS
The IWS (integral heat pump controller) helps you to troubleshoot
if the fault cannot be identified using the WPM.
2
1
BA
BA
26�03�01�0921
4
3
1 LEDs
2 Reset button
3 DIP switch (WP-Typ)
4 DIP switch (BA)

INSTALLATION
Maintenance
16 | WPL 34 | WPL 47 | WPL 57 www.stiebel-eltron.com
14.1.1 Checking the "HP type" DIP switch on the IWS
 Check whether the "WP-Typ"DIP switch is set as follows:
WP - Typ
ON
1 2 3 4
D0000057055
14.1.2 Checking the IWS DIP switch "BA"
 Check whether the "BA" DIP switch is set as follows:
BA
ON
1 2 3 4
D0000057050
14.1.3 LED
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.
14.1.4 Reset button
If the IWS was incorrectly initialised, the settings can be reset with
this button. For this also observe the chapter "Reinitialising IWS"
in the heat pump manager operating and installation instructions.
14.2 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, noise develops.
How to remedy rhythmic scratching or grinding noises:
 Check whether the condensate drain is clear of obstructions.
 Carry out a manual defrost, repeatedly if required, until the
fan runs free again.
 At outside temperatures above + 1°C, switch the appliance
off for around 1hour or switch it over to emergency mode.
After this, the ice should have melted.
 Check whether the appliance is installed in line with the in-
stallation conditions.
 If the noises occur frequently, notify customer support.
15. Maintenance
WARNING Electrocution
Prior to maintenance and cleaning work, isolate the ap-
pliance from its power supply.
We recommend that you perform an annual inspection (to estab-
lish the current condition of the system), and carry out any main-
tenance as 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:
Remove casing panels (see chapter "Installation").
 Check the hose and the pipe of the condensate drain.
 Remove dirt and blockages immediately.
 Refit the casing parts on the appliance (see chapter
"Installation").

INSTALLATION
Specication
www.stiebel-eltron.com WPL 34 | WPL 47 | WPL 57 | 17
16. Specification
16.1 Dimensions and connections
g01 g02
i21 i21
D0000016788
g01 Air intake
g02 Air discharge
i21 Entry supply line

INSTALLATION
Specication
18 | WPL 34 | WPL 47 | WPL 57 www.stiebel-eltron.com
16.2 Wiring diagram WPL 34 | 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 Compressor intake temperature sensor - PT1000
B8 Evaporator discharge temperature sensor - PT1000
B9 Frost protection temperature sensor - KTY
B10 Injection temperature sensor - PT1000
E2 Oil sump heater
E3 Ribbon heater
F2 High pressure switch
F8 Motor overload relay
F9 Fan fuse
K1 Safety contactor
M1 Compressor motor
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
Q1 Softstart contactor
X1 Terminals
X2 Low voltage terminal strip
X3 Mains terminal
X4 Control terminal
X29 12-pin IWS plug - control unit
X30 3-pin IWS plug - BUS
X31 Oil sump heater terminal
X32 Earth support point
X33 5-pin IWS plug - electrical expansion valve
X34 7-pin IWS plug - sensors
X35 6-pin IWS plug - temperature sensors
X36 3-pin IWS plug - fan
X37 5-pin IWS plug - electrical injection valve
X38 3-pin IWS plug - DHC
X39 Pressure sensor terminal
X40 Ground temperature sensor 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

INSTALLATION
Specication
www.stiebel-eltron.com WPL 34 | WPL 47 | WPL 57 | 19
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

INSTALLATION
Specication
20 | WPL 34 | WPL 47 | WPL 57 www.stiebel-eltron.com
16.3 Wiring diagram WPL 57
1
2
3
4
A2
X29
X36
X35
X30
X34
X33
B5
T
B6
T
B7
T
B8
T
B2
T
X2
M6
M
1~
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
X61
1
2
X63
3
2
1
X64
3
2
1
A3
F9 F9
X60
1 2
X1/1 X1/3
X32
R2R3 R1
X1
Y1
p >
3
2
N2 F2
F8
> p
X31
E2E3
1
2143
2
X4 1 2 3 4 5 6
ERR L N PE
A2 A1
K1.1
1
2
3
4
5
6
7
8
9
A2 A1
K1
A2 A1
K2
T1
T2
> u
M2
M1
A3/X60
X32
>T
F10
M7/1 MM7/2
M
1 2 3 4 5 6 7 8 9 10
A3
1 2 3 4 51 2 3 4
X68
X69 X66
X41
26�03�01�1429
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 Compressor intake temperature sensor - PT1000
B8 Evaporator discharge temperature sensor - PT1000
B9 Frost protection temperature sensor - KTY
B10 Injection temperature sensor - PT1000
E2 Oil sump heater
E3 Ribbon heater
F2 High pressure switch
F8 Motor overload relay
F9 Fan fuse
K1 Safety contactor
M1 Compressor motor
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
Q1 Softstart contactor
X1 Terminals
X2 Low voltage terminal strip
X3 Mains terminal
X4 Control terminal
X29 12-pin IWS plug - control unit
X30 3-pin IWS plug - BUS
X31 Oil sump heater terminal
X32 Earth support point
X33 5-pin IWS plug - electrical expansion valve
X34 7-pin IWS plug - sensors
X35 6-pin IWS plug - temperature sensors
X36 3-pin IWS plug - fan
X37 5-pin IWS plug - electrical injection valve
X38 3-pin 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