STIEBEL ELTRON WPL 10 AC Specification sheet

OPERATION AND INSTALLATION
AIR | WATER HEAT PUMP
» WPL 10 AC
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CONTENTS
SPECIAL INFORMATION ���������������������������������������������3
OPERATION ����������������������������������������������������������4
1. General information �����������������������������������������4
1.1 Further 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
2.3 CE designation ��������������������������������������������������� 5
3. Equipment description ��������������������������������������5
3.1 Properties ��������������������������������������������������������� 5
3.2 Function ����������������������������������������������������������� 5
4. Settings �������������������������������������������������������6
5. Maintenance and care ���������������������������������������6
6. Troubleshooting ����������������������������������������������6
INSTALLATION �������������������������������������������������������7
7. Safety����������������������������������������������������������7
7.1 General safety instructions ������������������������������������ 7
7.2 Instructions, standards and regulations �������������������� 7
8. Equipment description ��������������������������������������7
8.1 Standard delivery������������������������������������������������ 7
8.2 Accessories�������������������������������������������������������� 7
9. Preparations ��������������������������������������������������7
9.1 Acoustic emissions ���������������������������������������������� 7
9.2 Mindestabstände ������������������������������������������������ 8
9.3 Preparation of the installation location ��������������������� 8
9.4 Handling����������������������������������������������������������� 8
9.5 Positioning �������������������������������������������������������� 8
9.6 Heat pump manager WPM 3���������������������������������� 10
9.7 Buffer cylinder �������������������������������������������������� 10
9.8 Preparing the electrical installation ������������������������ 10
10. Mounting���������������������������������������������������� 10
10.1 Positioning ������������������������������������������������������� 10
10.2 Heating water connection������������������������������������� 11
10.3 Flow and return connection ���������������������������������� 11
10.4 Oxygen diffusion������������������������������������������������ 11
10.5 Filling the heating system ������������������������������������ 12
10.6 Minimum flow rate ��������������������������������������������� 12
10.7 Setting the flow rate on the heating side ������������������ 12
10.8 Condensate drain ����������������������������������������������� 13
10.9 External heat source 2����������������������������������������� 13
10.10 Safety temperature controller for underfloor heating
system ������������������������������������������������������������ 13
10.11 Power supply ���������������������������������������������������� 13
11. Commissioning ��������������������������������������������� 17
11.1 Checks before commissioning�������������������������������� 17
11.2 Commissioning�������������������������������������������������� 19
11.3 Operation and control ����������������������������������������� 20
11.4 Taking the appliance out of use������������������������������ 20
12. Maintenance ������������������������������������������������ 20
12.1 Light Emitting Diodes (LED)����������������������������������� 20
12.2 Reset button ����������������������������������������������������� 21
12.3 Resetting the high limit safety cut-out ��������������������� 21
12.4 Fan noise ��������������������������������������������������������� 21
13. Specification ������������������������������������������������ 22
13.1 Connection dimensions and variations��������������������� 22
13.2 Wiring diagram WPL 10 AC (three-phase) ����������������� 24
13.3 Wiring diagram WPL 10 ACS (single phase)��������������� 26
13.4 Output diagrams, heating WPL 10 AC�����������������������28
13.5 Output diagrams, cooling WPL 10 AC����������������������� 29
13.6 Output diagrams, heating WPL 10 ACS��������������������� 30
13.7 Output diagrams, cooling WPL 10 ACS ��������������������� 31
13.8 Details on energy consumption������������������������������ 32
13.9 Data table �������������������������������������������������������� 32
WARRANTY
ENVIRONMENT AND RECYCLING ��������������������������������� 35

SPECIAL INFORMATION
ENGLISH
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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 experi-
ence provided that they are supervised or they
have been instructed on how to use the appliance
safely and have understood the resulting risks.
Children must never play with the appliance. Chil-
dren must never clean the appliance or perform
user maintenance unless they are supervised.
- Use a permanent connection to the power supply.
Ensure the appliance can be separated from the
power supply by an isolator that disconnects all
poles with at least 3mm contact separation.
- 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).
- Never interrupt the power supply, even outside
the heating period. The system’s active frost pro-
tection is not guaranteed if the power supply is
interrupted.
- If the heat pump and frost protection are com-
pletely switched off, drain the system on the
water side.

OPERATION
GENERAL INFORMATION
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OPERATION
1. General information
The chapter “Operation” is intended for appliance users and heat-
ing contractors.
The chapter “Installation” is intended for heating 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 Further applicable documents
Note
Please observe the operating and installation instructions
of system components.
1.2 Safety instructions
1.2.1 Layout of safety instructions
KEYWORD Type of risk
Here, possible consequences are listed that may result
from failure to observe the safety instructions.
 Steps to prevent the risk are listed.
1.2.2 Symbols, type of risk
Symbol Type of risk
!Injury
Electrocution
1.2.3 Keywords
KEYWORD Meaning
DANGER Failure to observe this information will result in serious
injury or death.
WARNING Failure to observe this information may result in serious
injury or death.
CAUTION Failure to observe this information may result in non-
serious or minor injury.
1.3 Other symbols in this documentation
Note
Notes are bordered by horizontal lines above and below
the text. General information is identified by the symbol
shown on the left.
 Read these texts carefully.
Symbol
!Damage to the appliance and environment
Appliance disposal
Never cover the appliance
 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
Explanations to determine and interpret the specified standardised
output data.
1.5.1 Standard: EN 14511
The output data specifically mentioned in text, diagrams and
technical datasheets has been calculated according to the test
conditions of the standard shown in the heading of this section.
Generally, these standardised test conditions will not fully meet
the conditions found at the installation site of the system user.
Depending on the chosen test method and the extent to which
this method deviates from the conditions defined in the norm
shown in the heading of this section, any deviations can have a
considerable impact.
Further factors that have an influence on the test values are the
measuring equipment, the system configuration, the age of the
system and the flow rates.
A confirmation of the specified output data can only be obtained
if the test conducted for this purpose is also performed in ac-
cordance with the conditions defined in the norm shown in the
heading of this section.

OPERATION
SAFETY
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2. Safety
2.1 Intended use
The appliance is designed for the following purposes:
- For central heating
- For central cooling
- For DHW heating
Observe the operating limits listed in chapter “Specification”.
This appliance is designed for domestic use. 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.
Any changes or conversions to the appliance void any warranty.
2.2 Safety instructions
Observe the following safety instructions and regulations.
- The electrical installation and installation of the heating cir-
cuit must only be carried out by a qualified contractor or by
our customer service engineers.
- Contractors are responsible for adherence to all currently ap-
plicable regulations during installation and commissioning.
- Operate the appliance only when fully installed and with all
safety equipment fitted.
- Protect the appliance from dust and dirt ingress during
building work.
!
WARNING Injury
The appliance may be used by children aged 8 and up
and persons with reduced physical, sensory or mental
capabilities or a lack of experience provided that they
are supervised or they have been instructed on how to
use the appliance safely and have understood the result-
ing risks. Children must never play with the appliance.
Children must never clean the appliance or perform user
maintenance unless they are supervised.
2.3 CE designation
The CE designation shows that the appliance meets all essential
requirements according to the:
- Electromagnetic Compatibility Directive
- Low Voltage Directive
3. Equipment description
3.1 Properties
The appliance is an air source heat pump for external installation
that is designed to provide central heating. Heat is extracted from
the outside air at a low temperature level, and is then transferred
to the heating water at a higher level. The heating water can be
heated up to a flow temperature of 60 °C. The refrigerant circuit
is reversed for cooling operation.
The appliance is equipped with an electric emergency/booster
heater (DHC). In mono mode, the electric emergency/booster
heater is activated when the dual mode point can no longer be
maintained, in order to safeguard heating operation and to pro-
vide high DHW temperatures. In such cases, the electric emer-
gency/booster heater is activated in mono energetic operation as
a booster heater.
This appliance has further operational characteristics:
- Suitable for underfloor and radiator heating.
- Preferred for low temperature heating systems.
- Still extracts heat from the outside air at -20 °C outside
temperature.
- Corrosion-protected, external casing made from galvanised
sheet steel plus stove-enamelled finish.
- Comprises all components required for operation and all
safety equipment.
- Filled with non-combustible safety refrigerant.
- Suitable for cooling through extraction of heat from the heat-
ing system.
Note
For centralised control over the entire heating system,
you would need the “WPM 3” heat pump manager.
3.2 Function
Heat is extracted from the outdoor air via the heat exchanger
(evaporator) on the air side. The evaporated refrigerant is com-
pressed by a compressor. Electrical energy is necessary for this
process. At this point, the refrigerant is at a higher temperature
level. A further heat exchanger (condenser) transfers the heat to
the heating circuit. During this process, the refrigerant expands
again, and the cycle begins again.
During cooling mode, the condenser becomes the evaporator and
the evaporator becomes the condenser. The cycle is reversed. This
enables heat to be transferred from the internal rooms to the
outdoor air.
At air temperatures below approx. +7 °C, the humidity in the air
condenses as hoarfrost on the evaporator fins. Any hoarfrost is
automatically defrosted. Water created by this process collects in
the defrost pan and is drained off via a hose.
!
Damage to the appliance and the environment
In the defrost cycle, the fan is switched off and the heat
pump circuit is reversed. The heat required for defrosting
is drawn from the buffer cylinder. For operation without
a buffer cylinder, the general conditions defined in the
chapter “Installation without buffer cylinder” must be
adhered to. Otherwise the heating water freezes under
unfavourable conditions.
The heat pump automatically reverts to heating mode at the end
of the defrost cycle.

OPERATION
SETTINGS
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!
Damage to the appliance and the environment
In dual mode operation, the return water of the second
heat source can flow through the heat pump. Please note
that the return temperature must be no higher than 60 °C.
4. Settings
The system is operated exclusively with the heat pump manager
(WPM 3).
 Observe the heat pump manager operating and installation
instructions.
5. Maintenance and care
!
Damage to the appliance and the environment
Maintenance work, such as checking the electrical safety,
must only be carried out by a qualified contractor.
A damp cloth is sufficient for cleaning all plastic and sheet steel
parts. Never use abrasive or corrosive cleaning agents.
Check the condensate drain monthly (visual inspection). Remove
contaminants and blockages immediately (see chapter “Position-
ing”).
!
Damage to the appliance and the environment
Keep the air discharge and intake apertures free from
snow and leaves.
We recommend an annual inspection (establishing the actual
state) and, if required, maintenance (returning the set state) by a
specialist contractor.
6. Troubleshooting
Störung Ursache Behebung
The external unit
leaks water.
The condensate drain may be
blocked.
Clean the condensate
drain as described
in chapter ‘Care and
maintenance’.
This can cause the
humidity in the
outdoor air to ac-
cumulate as dew
or frost on the
cooled heat pump
casing
The heat pump is drawing heat
from the outdoor air to heat the
building. This can cause the humid-
ity 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 heating contractor. To
facilitate and speed up your enquiry, please provide the serial
number from the type plate. The type plate is located on the front
at the top on the right or left hand side of the casing.
Sample type plate
Montageanweisung beachten! Dichtheit geprüft! Made in Germany
*xxxxxxxxxxxxxxxxxx*
1
26�03�01�1570
1 Number on the type plate

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INSTALLATION
SAFETY
INSTALLATION
7. Safety
7.1 General safety instructions
- Only a qualified contractor should carry out installation,
commissioning, maintenance and repair of the appliance.
- We guarantee trouble-free operation and operational reli-
ability only if the original accessories and spare parts intend-
ed for the appliance are used.
7.2 Instructions, standards and regulations
Note
Observe all applicable national and regional regulations
and instructions.
8. Equipment description
The appliance protects the heating water lines against freezing up.
The integral frost protection circuit starts the circulation pump in
the heat pump circuit automatically at a condenser temperature
of 8 °C, and thereby ensures circulation in all water-carrying sec-
tions. If the temperature inside the buffer cylinder drops, the heat
pump starts automatically no later than when the temperature
falls below +5 °C.
8.1 Standard delivery
Delivered with the appliance:
- Wiring diagram
- Condensate drain hose
8.2 Accessories
8.2.1 Required accessories
Description
Heat pump manager with wall mounting casing, WPMW 3
8.2.2 Further accessories
Description
Wall mounting support WK-WPL
T-support SK-WPL
Mounting bracket MK-WPL 10 AC(S)
Hydraulic module HSBB 2.1
Pressure hoses DN 25
Remote control for heating systems FEK
Remote control for heating systems FE7
Starting current limiter 25 A
9. Preparations
The appliance is designed for siting in front of a wall. If the ap-
pliance is installed in an open space or on a roof, protect the air
intake side by erecting a wall to shield it against the wind.
 Maintain the minimum clearances to ensure trouble-free op-
eration of the appliance and facilitate maintenance work.
9.1 Acoustic emissions
On the air intake and air discharge sides, the appliance is louder
than on the enclosed sides. Please therefore observe the informa-
tion below.
For the sound power level, see chapter “Specification/Data table”.
 Ensure that the air intake direction is the same as the main
wind direction. Air should not be drawn in against the wind.
 Never direct the air intake or discharge towards noise sensi-
tive rooms of the house (e.g. bedrooms).
Lawn areas and shrubs contribute to the reduction of noise. For
this, observe the minimum clearances in the following figure:
Noise can also be reduced through dense palisades if these are
installed around the appliance. Observe the minimum clearances.

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INSTALLATION
PREPARATIONS
9.2 Mindestabstände
≥200
≥2000
≥500
≥1000
≥800
D0000022153
91�00�00�0036
 Do not install the appliance in a recess. Two sides of the ap-
pliance must remain exposed.
 Avoid installation on large, echoing floor areas (e.g. those
covered with tiles).
 Avoid installation between reflective building walls. Reflect-
ing building walls can increase the sound level.
9.3 Preparation of the installation location
The substrate must be horizontal, level, solid and permanent.
 Ensure that the appliance is accessible from all sides.
9.4 Handling
- You can hook lifting straps to move the appliance at the area
highlighted in grey at the bottom of the support frame.
26�03�01�1548
!
Damage to the appliance and the environment
Protect the appliance against heavy impact during trans-
port.
Only allow the appliance to be tilted during transport for a short
time to one of its longitudinal sides. The longer the appliance is
tilted, the greater the distribution of refrigerant in the system.
Wait approx. 30 minutes before starting the appliance after it has
been tilted.
9.5 Positioning
 Observe chapter “Sound emissions”.
 Observe the clearance dimension in the following diagram
when using a wall mounting support.
890
26�03�01�1683�
 Only use weather-resistant cables.
 Protect the flow and return pipes against frost with sufficient
thermal insulation. Provide thermal insulation in accordance
with applicable regulations.
 Also protect all supply lines/cables against humidity, damage
and UV radiation by means of a conduit.
Note
When routing the condensate hose, observe chapter “In-
stallation / condensate drain”.

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INSTALLATION
PREPARATIONS
Example: T-support SK-WPL
A
B
2
8
5
7
3
4
6
1
D0000019236
A Frost level
B 300
1 Heating circuit flow
2 Heating circuit return
3 Conduit for supply lines
4 Foundation
5 T-support
6 Gravel bed
7 Drainage pipe
8 Condensate hose
 Observe the static limits of the T-support used.
Example: Wall mounting support WK-WPL
≥200
2
5
3 1
4
D0000019244
1 Heating circuit flow
2 Heating circuit return
3 Condensate hose
4 Drainage pipe
5 Wall mounting bracket
 Observe the static limits of the building wall and the wall
mounting supports.
Example: Foundation slab
610
635
265
525
1350
e01
e02
80
110
b01
120
4
5
1
3
2
D0000034844
b01 Entry electrical cables” from below
e01 Heating circuit flow
e02 Heating circuit return
1 Air intake side
2 Air discharge side
3 Main wind direction
4 Condensate hose
5 Outlet for supply lines
2
8
7
3
4
6
1
2
1
9
5
A
70-80
D0000024451
A Frost level
1 Heating circuit flow
2 Heating circuit return
3 Conduit for supply lines
4 Foundation
5 Mounting bracket MK-WPL 10 AC(S)
6 Gravel bed
7 Drainage pipe
8 Condensate hose
9 Outlet for supply lines opt.

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INSTALLATION
MOUNTING
9.6 Heat pump manager WPM 3
A WPM3 heat pump manager is required to operate the appliance.
This controls the entire heating system.
9.7 Buffer cylinder
A buffer cylinder is recommended to ensure a trouble-free ap-
pliance operation. The buffer cylinder (SBP) not only provides
hydraulic separation of the volume flow in the heat pump and
heating circuit, but also serves as an energy source for defrost-
ing the evaporator. In this connection, read chapter “Minimum
flow rate”.
!
Damage to the appliance and the environment
The cooling operation will always require the SBP...cool
buffer cylinder plus a diffusion-proof insulation of the
pipework!
9.8 Preparing the electrical installation
WARNING Risk of electrocution!
Carry out all electrical connection and installation work
in accordance with national and regional regulations.
WARNING Risk of electrocution!
Only use a permanent connection to the power supply.
The appliance must be able to be separated from the
power supply by an isolator that disconnects all poles
with at least 3mm contact separation. This requirement
can be met by contactors, isolators, fuses etc.
!
Damage to the appliance and the environment
The specified voltage must match the mains voltage. Ob-
serve the type plate.
!
Damage to the appliance and the environment
Provide separate fuses for the 3 power circuits (for the
appliance, the electric emergency/booster heater and the
control unit).
 Always connect “L” for the heat pump and the control unit to
the same phase.
Where required, you can install our starting current limiter with
25 A for the WPL 10 AC (see “Additional accessories”).
 Route cables with the following cross-sections in accordance
with the respective fuse rating:
Fuse protec-
tion
Assignment Cable cross-section
C 25 A Heat pump
(single phase)
2.5 mm² for routing above the surface
4.0 mm² for routing through a wall
C 16 A Heat pump
(3-phase)
2.5 mm²
C 35 A Electric emer-
gency/booster
heater (DHC)
(single phase)
6.0 mm² for routing through a wall
4.0 mm² when routing multi-core cables
on a wall or in an electrical conduit on
a wall
C 16 A Electric emer-
gency/booster
heater (DHC)
(3-phase)
2.5 mm
1.5 mm² with only two live cores and
routing on a wall or in an electrical con-
duit on a wall.
C 16 A Control 1.5 mm²
The electrical data is given in the “Specification” chapter. You
require a J-Y (St) 2x2x0.8mm² cable as BUS cable.
10. Mounting
10.1 Positioning
 When installing the appliance, observe the air intake
direction.
 Position the standard unit on the prepared substrate.
26�03�01�1544
 Remove the cover.

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INSTALLATION
MOUNTING
26�03�01�1550
 Remove the transport locks (threaded rods) from the
compressor.
1
26�03�01�1759
1 Sound insulation
 Position the cover on the appliance.
 Secure the cover with the four screws.
10.2 Heating water connection
The heat pump heating system must be installed by a qualified
contractor in accordance with the water installation drawings that
are part of the technical documents.
 Thoroughly flush the pipework before connecting the heat
pump. Foreign matter, such as welding pearls, rust, sand
or sealant will impair the operational reliability of the heat
pump and can result in the heat pump condenser becoming
blocked.
10.3 Flow and return connection
!
Damage to the appliance and the environment
Insulate the heating flow and return lines with vapour
diffusion-proof material.
Fit an anti-vibration mount at least 1 m long to the connectors.
Structure-borne noise is substantially prevented by the anti-vibra-
tion construction of the heat pump and by the flexible pressure
hoses, which act as anti-vibration mounts.
 Take the position of the heating flow and return from the fol-
lowing figure:
26�03�01�1552
1
2
1 Heating circuit flow
2 Heating circuit return
 Connect the heat pump to the heating circuit. Check for
tightness.
10.4 Oxygen diffusion
!
Damage to the appliance and the environment
In underfloor heating systems, avoid open heating sys-
tems or the installation of steel pipes in conjunction with
plastic pipes that are permeable to oxygen.
Steel components, such as radiators and pipes, can corrode if
plastic underfloor heating system pipes, which are permeable to
oxygen, are used.
The products of corrosion, e.g. rusty sludge, can settle inside the
heat pump condenser and result in a lower output by reducing
the cross-section, or in a shutdown being activated by the high
pressure limiter.

12 | WPL 10 ACS WWW.STIEBEL-ELTRON.COM
INSTALLATION
MOUNTING
10.5 Filling the heating system
10.5.1 Water quality
Before the system is filled, a fill water analysis must be made
available. This may, for example, be requested from the relevant
water supply utility.
To avoid damage as a result of scaling, it may be necessary to
soften or desalinate the fill water. The fill water limits specified
in chapter “Specification / Data table” must always be observed.
 Recheck these limits 8-12 weeks after commissioning and as
part of annual system maintenance.
Note
With conductivity of >1000μS/cm, desalination treatment
is recommended in order to avoid corrosion.
Note
If you treat the fill water with inhibitors or additives, the
same limits as for desalination apply.
Note
Suitable appliances for water softening, as well as for
filling and flushing heating systems, can be obtained via
trade suppliers.
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
When operating without a buffer cylinder, safeguard the minimum
flow rate specified in the following table as well as the defrost
energy.
Heat pump Minimum flow rate
WPL 10 AC / WPL 10 ACS 0.7 m³/h
 Make the correct adjustments to the overflow valve.
Pump head Pump head to be adjusted at the over-
flow valve*
6 m 4.1 m
7 m 5.1 m
8 m 6.1 m
*Relative to commercially available Wilo and Grundfos pumps.
Note
When installing a heat meter, note that most heat meters
cause a substantial pressure drop. Consequently, size the
circulation pump correspondingly larger.
10.7 Setting the flow rate on the heating side
!
Material damage
For operation without a buffer cylinder, it is essential
that the electric emergency/booster heater (DHC) is con-
nected.
The appliance is designed in such a way that no buffer cylinder
is required to provide hydraulic separation of the flow in the heat
pump circuit and the heating circuit in conjunction with area heat-
ing systems.
For installations with several heating circuits, we recommend the
use of a low loss header.
The setting is made in heat pump mode. For this, make the fol-
lowing settings first:
Operate the appliance in heating mode.
To do so, switch on the appliance using the parameter SET FIXED
TEMPERATURE in the COMMISSIONING menu.
10.7.1 Minimum flow rate with individual room control via
FEK/FE7 for systems without a buffer cylinder and
without a low loss header
For operation without buffer cylinder, make the following set-
ting at the WPM: In the menu SETTINGS / HEATING / STANDARD
SETTING, set parameter BUFFER OPERATION to OFF.
In such cases, one or more heating circuits in the heating system
must remain open. The open heating circuit(s) should be installed
in the lead room (room in which the external programming unit
is installed, e.g. the living room). Individual rooms can then be
controlled with the external programming unit or indirectly by
adjusting the heating curve or by activating room influence.
 Fully open the heating circuit(s) in the lead room.
 Close all other heating circuits.
 If an overflow valve is installed in the heating system, close
this fully before determining the minimum flow rate.
 Make the settings for the heating circuit pump so that the
minimum flow rate required for system operation is ensured
(see chapter „Specification/ Data table“).
The current flow rate can be called up in the menu INFO/ HEAT
PUMP/ PROCESS DATA, under WP WATER FLOW RATE.
10.7.2 Minimum flow rate for systems with buffer cylinder or
low loss header
For operation with buffer cylinder, make the following setting at
the WPM: In the menu SETTINGS / HEATING / STANDARD SET-
TING, set parameter BUFFER OPERATION to ON.
 Make the settings for the heating circuit pump so that the
nominal flow rate required for system operation is ensured
(see chapter „Specification/ Data table“).
The current flow rate can be called up in the menu INFO/ HEAT
PUMP/ PROCESS DATA, under WP WATER FLOW RATE.
 For operation without a buffer cylinder and with a low loss
header, ensure that the electric emergency/booster heater is
connected.

ENGLISH
WWW.STIEBEL-ELTRON.COM WPL 10 ACS | 13
INSTALLATION
MOUNTING
10.8 Condensate drain
A condensate drain connector is fitted to the defrost pan at the
factory to enable the condensate to drain off.
26�03�01�1552
1
1 Condensate drain
 Secure a hose to the condensate drain connector.
 Insulate the hose to ensure frost protection.
!
Damage to the appliance and the environment
Ensure the hose is not kinked. Route the hose with a
slope.
 Check after routing the hose that the condensate can drain
correctly.
10.9 External heat source 2
For dual mode systems, always connect the heat pump into the
return of the second heat source (e.g. oil boiler).
10.10 Safety temperature controller for underfloor
heating system
!
Material damage
n 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.
10.11 Power supply
Note
Observe the operating and installation instructions of the
WPM 3 heat pump manager.
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.
The terminals are located in the connecting chamber of the ap-
pliance.
 Observe chapter “Preparing the electrical installation”.
 Use appropriate cables in accordance with local regulations
for all connections.
 Route all cables and leads through strain relief fittings.
10.11.1Access to the connecting chamber
26�03�01�1544
 Remove the cover.
26�03�01�1552
1
1 Cable entries
 Thread the connecting cables from below through the cable
entries upwards to the connecting chamber.
26�03�01�1535
1
1 Connecting chamber

14 | WPL 10 ACS WWW.STIEBEL-ELTRON.COM
INSTALLATION
MOUNTING
10.11.2Power supply WPL 10 AC (three-phase)
 Connect your power cable according to the following
diagram.
 Connect the electric emergency/booster heater if you want to
utilise the following appliance functions:
Appliance func-
tion
Effect of the electric emergency/booster
heater
Mono energetic
operation
If the heat pump cannot reach the dual mode point, the
electric emergency/booster heater ensures both the
heating operation and the provision of high DHW tem-
peratures.
Emergency mode Should the heat pump suffer a fault that prevents its
continued operation, the heating output will be covered
by the electric emergency/booster heater.
Heat-up program
(only for underfloor
heating systems)
The electric emergency/booster heater must provide the
drying heat in case of return temperatures <25°C.
With these low system temperatures, the drying heat
must not be provided by the heat pump, otherwise the
frost protection of the appliance can no longer be guar-
anteed during the defrost cycle.
After expiry of the heat-up program, you can discon-
nect the electric emergency/booster heater if it is not
required for the appliance operation.
Please note that during the heat-up program, the emer-
gency mode cannot be selected.
Pasteurisation
control
The electric emergency/booster heater starts automati-
cally when the pasteurisation control is active in order to
regularly heat the DHW to 60 °C to protect it against the
growth of legionella bacteria.
1
2
3
4
5
26�03�01�1730
D0000035392
6
1X5 Electric emergency/booster heater (DHC)
L1, L2, L3, N, PE
Connected
load
Terminal assignment
2.6 kW L1 N PE
3.0 kW L2 N PE
3.2 kW L3 NPE
5.6 kW L1 L2 N PE
5.8 kW L1 L3 NPE
6.2 kW L2 L3 NPE
8.8 kW L1 L2 L3 NPE
2X3 Power supply (heat pump, compressor)
L1, L2, L3, N, PE
3X4 Control voltage
Mains supply: L, N, PE
4X2 Low voltage (BUS cable)
BUS High H
Bus Low L
BUS earth
BUS “+” (is not connected)
5 Earth terminal for screening the LV lead
6Ribbon heater
Mains supply: L, N, PE
 Earth the LV lead by inverting the screen over the external
sheath and clamping it under the earth terminal.
 Then check the function of the strain relief fittings.

ENGLISH
WWW.STIEBEL-ELTRON.COM WPL 10 ACS | 15
INSTALLATION
MOUNTING
10.11.3Power supply WPL 10 ACS (single phase)
 Connect your power cable according to the following
diagram.
 Connect the electric emergency/booster heater if you want to
utilise the following appliance functions:
Appliance func-
tion
Effect of the electric emergency/booster
heater
Mono energetic
operation
If the heat pump cannot reach the dual mode point, the
electric emergency/booster heater ensures both the
heating operation and the provision of high DHW tem-
peratures.
Emergency mode Should the heat pump suffer a fault that prevents its
continued operation, the heating output will be covered
by the electric emergency/booster heater.
Heat-up program
(only for underfloor
heating systems)
The electric emergency/booster heater must provide the
drying heat in case of return temperatures <25°C.
With these low system temperatures, the drying heat
must not be provided by the heat pump, otherwise the
frost protection of the appliance can no longer be guar-
anteed during the defrost cycle.
After expiry of the heat-up program, you can discon-
nect the electric emergency/booster heater if it is not
required for the appliance operation.
Please note that during the heat-up program, the emer-
gency mode cannot be selected.
Pasteurisation
control
The electric emergency/booster heater starts automati-
cally when the pasteurisation control is active in order to
regularly heat the DHW to 60 °C to protect it against the
growth of legionella bacteria.
1
2
3
4
5
26�03�01�1529
D0000035392
6
1X5 Electric emergency/booster heater (DHC)
L, L, N, PE
Connected load Terminal assignment
3.0 kW L N PE
3.2 kW L N PE
6.2 kW L L N PE
2X3 Power supply (heat pump, compressor)
L, N, PE
3X4 Control voltage
Mains supply: L, N, PE
4X2 Low voltage (BUS cable)
BUS High H
Bus Low L
BUS earth
BUS “+” (is not connected)
5 Earth terminal for screening the LV lead
6Ribbon heater
Mains supply: L, N, PE
 Earth the LV lead by inverting the screen over the external
sheath and clamping it under the earth terminal.
 Then check the function of the strain relief fittings.
!
Damage to the appliance and environment
Please note:
When making the L and N connections of the compressor
and the L and N connections of the control unit in single
phase appliances, ensure that the same phase is used.
Protect the circuit with an RCD.

16 | WPL 10 ACS WWW.STIEBEL-ELTRON.COM
INSTALLATION
MOUNTING
Connection example
BUS H BUS L BUS -
L N PE L L N PE L N PE 1 2 3
WP DHC
K1
L N PE
T
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
N 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PE
Netz N Netz L Netz L´ Pumpen L UP-WP 1 UP-WP 2 UP-Quelle UP-Hzg. 1 UP-Hzg. 2 UP-WWB UP-Zirkul. 2. WE 2. WE Mischer+ Mischer- UP-Sol/Kue
Außen
Vorlauf
Rüecklauf
WB Ein
2. WE
Quelle
Mischer
Analog
Fern 1 Fern 3
BUS H
BUS L
BUS -
BUS +
Fühler 1 Fühler 2
1
3
4
2
D0000035461
1 Heat pump
2 Heat pump manager
3 Main Control panel
4 Power-OFF contactor
10.11.4Closing the wiring chamber
1
26�03�01�1759
1 Sound insulation
 Secure the cover with the four screws.
 Connect the circulation pump for the heat utilisation side to
the heat pump manager in accordance with the engineering
documents.

ENGLISH
WWW.STIEBEL-ELTRON.COM WPL 10 ACS | 17
INSTALLATION
COMMISSIONING
11. Commissioning
A WPM3 heat pump manager is required to operate the appli-
ance. 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.
Carry out commissioning in accordance with these installation
instructions and the operating and installation instructions of the
heat pump manager. Our customer service can assist in the com-
missioning, which is chargeable.
Where this appliance is intended for commercial use, the rules of
the relevant Health & Safety at Work Act may be applicable for
commissioning. For further details, check your local authorising
body.
After commissioning, complete the commissioning report that is
part of these instructions.
11.1 Checks before commissioning
Before commissioning, check the following points.
11.1.1 Heating system
- Have you filled the heating system to the correct pressure,
and opened the quick-acting air vent valve?
11.1.2 Temperature sensors
- Have you correctly located and connected the outside tem-
perature sensor and the return temperature sensor (in con-
junction with a buffer cylinder)?
11.1.3 Power supply
- Have you correctly connected the power supply?
11.1.4 Transport locks
- Have you removed the threaded rods that secure the
compressor?
11.1.5 Checking the IWS DIP switch settings
Carry out the following steps to make the IWS accessible.
26�03�01�1544
 Remove the cover.
26�03�01�1530
 Remove the bracket highlighted in grey as follows:
1
26�03�01�1531
1 IWS
 Position the panel highlighted in grey with the IWSas
follows:
 Lift the panel highlighted in grey.
26�03�01�1532
1
 Secure the panel with the locking stay.

18 | WPL 10 ACS WWW.STIEBEL-ELTRON.COM
INSTALLATION
COMMISSIONING
IWS
BA
BA
3
4
1
2
C26�03�01�0921
1 LEDs
2 Reset button
3 DIP switch (type WP)
4 DIP switch (BA)
DIP switch (“WP-Typ”)
With the DIP switch (“WP-Typ”), you can select the various heat
pump types on the IWS.
Factory setting:
Compressor mode with electric emergency/booster heater
WP-Typ
26�03�01�1513
 Check whether the DIP switch is set correctly.
Compressor mode with an external second heat source
!
Damage to the appliance and environment
In this case, do not connect the electric emergency/
booster heater.
If the appliance is operated in dual mode with an external sec-
ondheat source or as a module with a further heat pump of the
same design, set the DIP switch to “WP-Typ4”.
 Set the DIP switch as follows.
26�03�01�1514
DIP switch (BA)
 Check whether the DIP switch (BA) is set correctly.
Heating operation only:
BA
26�03�01�1537
With cooling operation:
BA
26�03�01�1536

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WWW.STIEBEL-ELTRON.COM WPL 10 ACS | 19
INSTALLATION
COMMISSIONING
11.1.6 High limit safety cut-out
In ambient temperatures of below -15 °C it is possible that the high
limit safety cut-out of the electrical emergency/booster heater
may trip.
 Check whether the high limit safety cut-out has tripped.
 Remove the cause of the fault.
26�03�01�1528
 Reset the high limit safety cut-out by pressing the reset
button.
11.1.7 Closing the wiring chamber
1
26�03�01�1759
1 Sound insulation
 Position the cover on the appliance.
 Secure the cover with the four screws.
11.2 Commissioning
11.2.1 Heating curve adjustment
The efficiency of a heat pump decreases with rising flow tempera-
ture. The heating curve should therefore be adjusted with care.
Heating curves that are adjusted too high lead to the zone and
thermostatic valves closing, which may lead to the minimum flow
rate required for the heating circuit not being achieved.
 Observe the WPM 3 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 or 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
achieved in the lead room.
Standard values for the start:
Parameter Underfloor heating system Heating system with radiators
Heating curve 0.4 0.8
CNTRL RESP TM 5 15
Room temperature 20 °C 20 °C
If the room temperature in spring and autumn is too low (approx.
10 °C outside temperature), the parameter “room temperature”
must be raised.
Note
If no remote control is installed, raising the parameter
“room temperature” leads to a parallel offset of the heat-
ing curve.
Increase the parameter “HTG CURVE” if the room temperature is
not high enough when outside temperatures are low.
If the parameter “HTG CURVE” has been raised, adjust the zone or
thermostatic valve in the lead room to the required temperature
at high outside temperatures.
!
Damage to the appliance and the environment
Never reduce the temperature in the entire building by
closing all zone or thermostatic valves, but by using the
setback programs.
When everything has been implemented correctly, the system
can be heated to its maximum operating temperature and vented
once again.

20 | WPL 10 ACS WWW.STIEBEL-ELTRON.COM
INSTALLATION
MAINTENANCE
!
Damage to the appliance and the environment
With underfloor heating systems, observe the maximum
permissible temperature for the system.
11.2.2 Further WPM 3 settings
11.2.3 For operation without buffer cylinder
 Connect the heating circuit pump to the buffer cylinder pri-
mary pump terminals in accordance with the technical guide.
When everything has been implemented correctly, the system
can be heated to its maximum operating temperature and vented
once again.
!
Damage to the appliance and environment
With underfloor heating systems, observe the maximum
permissible temperature for the underfloor heating sys-
tem.
11.2.4 When using the heat-up program
If you use the heat-up program, make the following settings on
the WPM 3:
 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 param-
eter “DUAL MODE TEMP HZG” and “LOWER APP LIMIT
HZG” to their respective standard values or to the respec-
tive system values.
11.3 Operation and control
!
Damage to the appliance and the environment
Never interrupt the power supply, even outside the heat-
ing period. The system‘s active frost protection is not
guaranteed if the power supply is interrupted.
The system does not have to be switched off in summer. The
WPM3 has an automatic summer/winter changeover.
11.4 Taking the appliance out of use
If the appliance is to be taken out of use, set the WPM3 to standby.
This retains the safety functions designed to protect the system
(e.g. frost protection).
!
Damage to the appliance and the environment
If the heat pump and frost protection are completely
switched off, drain the system on the water side.
12. Maintenance
Check the condensate drain (visual inspection). Remove contami-
nants and blockages immediately.
!
Damage to the appliance and the environment
Keep the air discharge and intake apertures free from
snow and ice.
Regularly remove all leaves and accumulated dirt from the evapo-
rator fins, which can be accessed by removing the side panel on
the condenser side .
Troubleshooting
Note
Observe the heat pump manager operating and installa-
tion instructions (WPM 3).
If a fault cannot be located during service using the heat pump
manager, open the control panel in emergencies and check the
IWS settings. This check must only be carried out by a heating
contractor.
12.1 Light Emitting Diodes (LED)
LEDs on the IWS
BA
BA
1
C26�03�01�0921
2
1 LEDs
2 Reset button