STIEBEL ELTRON wpf 20 Instruction Manual

OPERATION ANd INsTAllATION
BRINE | WATER HEAT PUMPs
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SPECIAL INFORMATION _____________________________________________3
OPERATION __________________________________________________________4
1. General information �����������������������������������������4
1.1 Safety information����������������������������������������������� 4
1.2 Other symbols in this documentation ����������������������� 4
1.3 Units of measurement ������������������������������������������ 4
1.4 Heat pump output data����������������������������������������� 4
2. Safety����������������������������������������������������������4
2.1 Correct use �������������������������������������������������������� 4
2.2 Safety instructions����������������������������������������������� 4
2.3 CE designation ��������������������������������������������������� 4
3. Device description �������������������������������������������5
3.1 Operational characteristics ������������������������������������ 5
3.2 Function ����������������������������������������������������������� 5
4. Control ��������������������������������������������������������5
5. Maintenance and care ���������������������������������������5
6. Other problems�����������������������������������������������5
INSTALLATION _______________________________________________________6
7. Safety����������������������������������������������������������6
7.1 General safety instructions ������������������������������������ 6
7.2 Instructions. standards and regulations �������������������� 6
8. Device description �������������������������������������������6
8.1 WPF 20 | 27�������������������������������������������������������� 6
8.2 WPF 35 | 40 | 52 | 66 ��������������������������������������������� 7
8.3 WPF 27 HT��������������������������������������������������������� 7
9. Standard delivery ��������������������������������������������8
9.1 Accessories�������������������������������������������������������� 8
10. Installation����������������������������������������������������8
10.1 Transport ���������������������������������������������������������� 8
10.2 Positioning �������������������������������������������������������� 8
10.3 Installation of the heat pump system������������������������ 9
10.4 Installation of the heat consumer system������������������ 10
10.5 Fitting the casing parts���������������������������������������� 12
10.6 Removing the casing parts ����������������������������������� 13
10.7 Power supply ���������������������������������������������������� 14
10.8 Modules ���������������������������������������������������������� 14
11. Commissioning ��������������������������������������������� 16
11.1 Operation and control ����������������������������������������� 16
12. Maintenance ������������������������������������������������ 16
13. Troubleshooting �������������������������������������������� 17
13.1 DIP switch (heat pump)���������������������������������������� 17
13.2 DIP switch (BA)�������������������������������������������������� 17
13.3 LEDs ________________________________________________________ 17
14. Specification ������������������������������������������������ 18
14.1 Water and brine connection ���������������������������������� 18
14.2 Wiring diagrams for heat pump WPF 20 | 27�������������� 19
14.3 Wiring diagrams for heat pump WPF WPF 35 | 40 ������� 20
14.4 Wiring diagrams for heat pump WPF WPF 52 | 66 ������� 21
14.5 Wiring diagrams for heat pump WPF WPF 27 HT �������� 22
14.6 Output diagrams WPF 20�������������������������������������� 24
14.7 Output diagrams WPF 27�������������������������������������� 26
14.8 Output diagrams WPF 27 HT���������������������������������� 28
14.9 Output diagrams WPF 35�������������������������������������� 30
14.10 Output diagrams WPF 40�������������������������������������� 32
CONTENT
14.11 Output diagrams WPF 52�������������������������������������� 34
14.12 Output diagrams WPF 66�������������������������������������� 36
14.13 Data table �������������������������������������������������������� 38
WARRANTY
ENVIRONMENT AND RECYCLING _________________________________ 43

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SPECIAL INFORMATION
- 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 and know-how, 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. Children 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
trouble-free operation of the appliance and
facilitate maintenance work.
- At the WPM II. set parameter source in the
commissioning list to "Ethylene glycol". otherwise
the frost stat would stop the heat pump at
temperatures below 7 °C.
- Maintenance work, such as checking the electrical
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
protection 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
automatic summer/winter changeover.
SPECIAL INFORMATION

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OPERATION
1. General information
The chapter entitled “Operation” is intended for appliance users
and contractors.
The chapter entitled “Installation” is intended for contractors.
Note
Read these instructions carefully before using the
appliance and retain them for future reference.
Pass on the instructions to a new user if required.
1.1 Safety information
1.1.1 Structure of safety information
KEYWORD Type of risk
Here, possible consequences are listed that may result
from non-observation of the safety information.
fSteps to prevent the risk are listed.
1.1.2 Symbols, type of risk
Symbol Type of risk
Injury
Electrocution
1.2 Other symbols in this documentation
Symbol
Damage to the appliance and environment
Note
Notes are bordered by horizontal lines above and below
the text. General information is identified by the symbol
shown on the left.
fRead these texts carefully.
fThis symbol indicates that you have to do something. The
action you need to take is described step by step.
1.3 Units of measurement
Note
All measurements are given in mm unless stated
otherwise.
1.4 Heat pump output data
Information regarding the measuring method and inter-
pretation of the heat pump output data provided in these
operating and installation instructions:
The output data provided in the text and diagrams of these
operating and installation instructions has been calculated
according to the standardised measuring conditions of EN14511.
Please note that these standardised measuring conditions do not
always wholly match the local on-site conditions of the individual
system user. The discrepancy may be significant, depending on
the measuring method selected, i.e. the degree of deviation of
the selected method, from the conditions stipulated in EN14511.
Further factors that may have an influence on the measured values
are the measuring equipment, the system configuration, the age
of the system and the flow rates.
It is only possible to confirm the output data provided in these
operating and installation instructions for a specific heat pump if
the measurement used for test purposes was taken under identical
conditions and parameters, i.e. in accordance with EN14511.
2. Safety
2.1 Correct use
The appliance is designed for central heating within the application
limits given in the specification.
This appliance is designed for domestic use. It can be safely
operated by untrained personnel. The appliance can also be used
in a non-domestic environment, e.g. in a small business, as long
as it is used in the same way.
Any other use beyond that described shall be deemed inappropriate.
Observation of this document is also part of the correct use of
the unit. Any changes or conversions to the appliance void any
warranty.
2.2 Safety instructions
Observe the following safety information and instructions.
The electrical installation and installation of the refrigerant circuit
must only be carried out by a recognised. qualified contractor or
by qualified Stiebel Eltron customer service engineers.
The recognised contractor is responsible for adherence to
all currently applicable instructions during installation and
commissioning.
Operate this device only if it is fully installed and all safety
equipment is fitted.
!
!
OPERATION
GENERAL INFORMATION | SAFETY

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Danger to life through electrocution! Never spray the device with water or other liquids.
!
Risk of damage! Prior to maintenance work. isolate the device from its
power supply.
!
DANGER Injury
he 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 resulting 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 device meets all the essential
requirements:
- Electrical Compatibility Directive (2004/108/EC)
- Low Voltage Directive (2006/95/EC)
- Pressure Equipment Directive (97/23/EC)
The rating plate is located at the back of the heat pump.
3. Device description
3.1 Operational characteristics
The WPF is a heating heat pump designed as brine/water heat
pump. The heat pump extracts energy from the heat source
medium. i.e. brine. at a low temperature level. This extracted
energy is then transferred to the heating water at a higher
level. enriched with the energy drawn by the compressor.
Subject to the heat source temperature. the heating water can be
heated up to a flow temperature of 60 °C.
With heat pump type WPF HT. subject to the heat source
temperature. the heating water can be heated to a flow
temperature of up to 75 °C.
A modular operation is possible with the WPF.
3.2 Function
The heat source medium (brine) enters the heat pump evaporator.
There. heat is extracted from the medium. so it exits the heat
pump at a lower temperature.
The energy made useful through the heat pump is transferred to
the heating water inside the condenser.
Then. the heating water transfers its energy to the heating circuit.
4. Control
The heat pump is exclusively controlled by the heat pump manager
WPM II. Therefore. observe the instructions in the chapter Operation
in the operating and installation instructions of the heat pump
manager WPM II.
5. Maintenance and care
!
Risk of damage! Maintenance work. such as checking the electrical
safety. must only be carried out by a qualified electrician.
Protect the equipment from dust and dirt ingress during
building work.
A damp cloth is sufficient for cleaning all plastic and sheet steel
parts. Do not use abrasive or corrosive cleaning agents!
6. Other problems
Check the fuse/circuit breaker in your fuse box. If it has blown/
tripped. replace/reset the fuse/MCB. Notify your local contractor
if the fuse/MCB blows/trips again.
If you cannot remedy the fault, notify your qualified contractor.
To facilitate and speed up your enquiry, please provide the serial
number from the type plate.
Sample type plate
Montageanweisung beachten! Dichtheit geprüft! Made in Germany
*xxxxxxxxxxxxxxxxxx*
26�03�01�1736
1
1 Number on the type plate
OPERATION
DEVICE DESCRIPTION | CONTROL | MAINTENANCE AND CARE

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INSTALLATION
7. Safety
Only qualified contractors should carry out installation.
commissioning. maintenance and repair of the appliance.
7.1 General safety instructions
We guarantee trouble-free operation and operational reliability
only if the original accessories and spare parts intended for the
appliance are used.
7.2 Instructions. standards and regulations
Observe all applicable national and regional regula- tions and instructions.
8. Device description
8.1 WPF 20 | 27
2
8
3
5
7
4
1
6
26�03�01�1318
INSTALLATION
SAFETY | DEVICE DESCRIPTION
1 Electrical terminals
2 Condenser
3 Fill & drain valve (heating)
4 Sight glass
5 Expansion valve
6 Fill & drain valve (brine)
7 Compressor
8 Evaporator

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8.2 WPF 35 | 40 | 52 | 66
2
8
3
5
7
4
1
6
26�03�01�0797
INSTALLATION
DEVICE DESCRIPTION
1 Electrical terminals
2 Condenser
3 Fill & drain valve (heating)
4 Sight glass
5 Expansion valve
6 Fill & drain valve (brine)
7 Compressor
8 Evaporator
8.3 WPF 27 HT
2
8
3
5
7
4
1
6
26�03�01�0797
1 Electrical terminals
2 Condenser
3 Fill & drain valve (heating)
4 Sight glass
5 Expansion valve
6 Fill & drain valve (brine)
7 Compressor
8 Evaporator

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9. Standard delivery
Heat pumps are delivered in two shipping units.
Designation Part no.
Standard heat pump device
Casing parts 223384
9.1 Accessories
Designation Part no.
Heat pump manager with wall mounting enclosure. WPMW II 185450
Heat pump manager as control panel mounted version. WPMS II 185451
Mixer module with wall mounting enclosure. MSMW 074012
Mixer module as control panel mounted version. MSMS 074011
Cylinder SBP 700 E 185459
Cylinder SBP 700 E SOL 185460
Kit WPVB 227760
Heating system remote control FE 7 185579
Contact sensor AVF 6 165341
Immersion sensor TF 6 165342
Heat transfer medium (concentrate) (10 litre can) 231109
Heat transfer medium (concentrate) (30 litre can) 161696
10. Installation
10.1 Transport
To protect the equipment against damage. transport it vertically
inside its packaging. Storage and transport at temperatures below
– 20 °C and in excess of + 50 °C are not permissible.
In the top of the frame are four holes for fitting lifting eyes M 12
where the equipment can be lifted.
The casing parts are delivered in a separate package. and these
are fitted to the device at the place of installation.
10.2 Positioning
10.2.1 General
Level the device horizontally by adjusting the equipment feet.
To prevent the heat pump from being damaged by frost in case
of external installation. fit and electrically connect the contact
sensor AVF 6 into the heating return as frost protection. Electrical
connection and sensor installation. see chapter "Power supply".
fObserve the minimum clearances.
≥500
≥500
≥500
≥500
≥1000
D0000019260
2 heat pumps may also be stacked.
fFor this, use the WPVB joining set.
1154 1115
2269
D0000020355
INSTALLATION
Standard delivery |
INSTALLATION

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10.2.2 External installation
We recommend foundations as base for the device.
26�03�01�0803
Route all supply lines inside a conduit that is free from frost
(protective pipe).
Protect the connection area at the back panel against all weather
and solar influences.
10.2.3 Internal installation
The room where the WPF is to be installed must meet the following
conditions:
- Load-bearing floor. For the weight of the WPF. see
"Specification".
- For a quiet heat pump operation on floating screeds. recess
the screed and the anti-vibration insulation around the
installation location
of the heat pump.
4
2
1
C26�03�01�0802
3
1 Concrete ceiling
2 Impact sound insulation
3 Floating screed
4 Recess
- The room must not be subject to a risk of explosions arising
from dust. gases or vapours. Never allow the floor area
and the volume of the installation room to be less than the
minimum values listed in the table.
Typ Volume Floor area
WPF 20 14 m³ 5 m²
WPF 27 | WPF 27 HT 16 m³ 7 m²
WPF 35 23 m³ 9 m²
WPF 40 23 m³ 9 m²
WPF 52 28 m³ 11 m²
WPF 66 33 m³ 13 m²
- When installing the WPF in a boiler room together with
other heating equipment ensure. that the operation of other
heating equipment will not be impaired.
10.2.4 Sound emission.
Never install the heat pump immediately below or adjacent to
bedrooms. Insulate pipes through walls and ceilings against
structure-borne noise transmission.
10.3 Installation of the heat pump system
The layout of the connection material on the soruce side has to
be done according to the evaporator and condensator materials
(Technical Datas) to avoide corrosion.
Design the heat source system for the brine/water heat pump in
accordance with Stiebel Eltron technical guides.
Permitted brine:
- Heat transfer medium as concentrate on an ethylene glycol
base, part no: 231109
- Heat transfer medium as concentrate on an ethylene glycol
base, part no: 161696
10.3.1 Circulation pump and required flow rate
Use a circulation pump with compound-filled windings to supply
the brine. to prevent an earth short circuit through condensation
in the electrical part of the pump (cold water version).
Size the circulation pump in accordance with the system-specific
conditions. i.e. nominal flow rate and pressure drop must be taken
into consideration (see "Specification").
An adequate flow rate must be safeguarded at every possible
brine temperature. i.e.:
Size the nominal flow rate at brine temperature 0 °C with a
tolerance of + 10 %.
10.3.2 Connection and filling with brine
Prior to connecting the heat pump. check the heat source circuit
for possible leaks. and flush thoroughly.
Calculate the volume of the heat source circuit. You can obtain the
brine volume inside the heat pump from the "Specification" table.
The overall volume equals that of the required amount of brine
that should be mixed from undiluted ethylene glycol and water.
The chloride content of the water must not exceed 300 ppm.
INSTALLATION
INSTALLATION

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Mixing ratio
The brine concentration varies when using a ground collector or
a geothermal probe as a heat source.
The mixing ratio can be found in the table below.
Ethylene glycol Water
Geothermal probe 25% 75%
Geothermal collector 33% 67%
After filling the system with brine and prior to commissioning.
open the fill & drain valve until brine runs out of it. No water must
remain in the pipe run to the fill & drain valve.
10.3.3 Check the brine concentration:
fDetermine the density of the ethylene glycol/water mixture,
e.g. with a hydrometer.
Using the actual density and temperature, you can check the actual
concentration in the diagram.
1,10
1,09
1,08
1,07
1,06
1,04
1,03
1,02
1,01
1,00
0,99
0,98
-20 0 20 40 60 80 100
50 Vol.-%
0
1,05
40
33
30
25
20
10
A
26�03�01�1914
X Temperature [°C]
Y Density [g/cm³]
A Frost protection [°C]
Note
The quoted details refer to ethylene glycol (see
"Specification").
10.3.4 Checking the flow rate (during heat pump
commissioning)
Check the flow and return temperatures of the heat source. For
this. determine the temperature differential by measuring the
temperature under the thermal insulation on both flow and return
pipes of the heat pump.
The diagram shows the temperature spread at the nominal flow
rate.
6
1
2
5
4
3
2
1
-5 0 5 10 15 20
84�03�01�0017
Y Temperature differential
X Source inlet temperature
1 Brine = heating flow 35 °C
2 Brine = heating flow 50 °C
!Risk of damage!
At the WPM II. set parameter source in the commissioning
list to "Ethylene glycol". otherwise the frost stat would
stop the heat pump at temperatures below 7 °C. The
source inlet temperature can be checked on the display
of the WPM II under the Info Temp. system parameter.
10.4 Installation of the heat consumer system
The layout of the connection material on the heating side has to
be done according to the evaporator and condensator materials
(Technical Datas) to avoide corrosion.
Implement the heat consumer system (heating circuit) in
accordance with current technical rules. For safety equipment in
heating systems. consult the DIN EN 12828.
Ensure the correct connection of the heating flow and return.
Protect the heating water lines against frost and moisture (only
in case of external installation). Protect flow and return lines
in external installations with an adequate amount of thermal
insulation against frost and by routing them inside a conduit
against moisture
.
Maintain the required insulation thickness in accordance with the
Heating System Order [or local regulations].
The integral frost protection control (inside the heat pump). that
automatically starts the circulation pump in the heat pump circuit
at + 8 °C and thereby safeguards circulation in all water-bearing
components. offers additional frost protection. The heat pump is
started automatically no later than when the temperature inside
the buffer cylinder drops below + 5 °C.
Prior to connecting the heat pump. check the heating system for
leaks. flush it thoroughly. fill and carefully vent it.
INSTALLATION
INSTALLATION

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10.4.1 Oxygen diffusion
!Risk of damage
In underfloor heating systems. avoid open heating
systems 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.
10.4.2 Filling the heating system
Water quality
A fill water analysis must be available prior to charging the system.
This may, for example, be requested from the relevant water
supply utility.
!
Material losses
To avoid damage as a result of scaling, it may be necessary
to soften or desalinate the fill water. The fill water limits
specified in chapter "Specification / Data table" must
always be observed.
fRecheck 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
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.
10.4.3 Buffer cylinder
A buffer cylinder is recommended to ensure a trouble-free heat
pump operation. The buffer cylinder provides hydraulic separation
of the volume flow in the heat pump circuit and the heating circuit.
The flow rate in the heat pump remains constant if. for example.
the flow rate in the heating circuit is reduced by thermostatic
valves.
10.4.4 Circulation pump (cylinder primary pump)
When using a buffer cylinder. observe the pressure drop of the
evaporator. of the connecting lines. bends. valves etc. in sizing the
circulation pump to be installed.
10.4.5 Circulation pump (heating circuit pump)
Where no buffer cylinder is used. size the circulation pump
on the heating side taking the condenser pressure drop into
consideration. The flow rate at DT = 10 K (see "Specification") of
the heat pump must be assured under all operating conditions of
the heating system through the installation of an overflow valve.
10.4.6 Second external heat source
For dual-mode heating systems. always connect the heat pump
into the return of the second heat source (e.g. oil fired boiler).
High heating water temperature: In dual-mode heating systems.
the return water from the second heat source can flow through
the heat pump. immediately after it has been switched off. with
a max. temperature of 60 °C. The temperature may be 70 °C no
earlier than ten minutes after the heat pump has been shut down.
10.4.7 Heat meter
Observe the additional pressure drop when installing heat meters
on the heating side. The sieves inside the heat meters are easily
blocked by dirt particles in the heating circuit. further increasing
the pressure drop.
INSTALLATION
INSTALLATION

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10.5 Fitting the casing parts
Fitting the plinth facia and control panel frame
1
2
1
C26�03�01�0791
2
1.
3.2.
fHook the plinth facia 1into the device frame and secure each with three screws
fPosition the covers 2and secure each with two screws to the sides.
Fitting the side covers
C26�03�01�0792
2
1
fFix the guard plate 1with four screws. The both in the front with the toothed locked washer.
fSecure the control panel frame 2with five screws.
INSTALLATION
INSTALLATION

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Fitting the side panels
1
1
C26�03�01�0793
2
fHook the side panels 1from the top into the slots and hooks
provided and secure with one screw each at the bottom of
the control panel frame.
fInstall sound insulation 2in the control panel frame
Fit front panel
C26�03�01�0795
fHook the bottom of the front panel into the control panel
frame. pivot it towards the frame and secure with one screw
on each side.
Fit centre cover
C26�03�01�0794
fPosition the cover at the front of the device and push it back;
then secure it with two screws.
fMake the power supply before the centre cover and front
panel are fitted.
10.6 Removing the casing parts
The casing parts are removed in reverse order.
INSTALLATION
INSTALLATION

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10.7 Power supply
Notify your local power supply utility of the electrical connection.
Only qualified electricians must carry out the installation in
accordance with these instructions.
Danger to life through electrocution! Before any work. isolate the equipment from the power
supply at the control panel.
Observe VDE 0100 [or local regulations] and the regulations of your
local power supply utility.
The heat pump must be able to be separated from the mains power
supply by an additional isolator. that disconnects all poles with at
least 3 mm contact separation. For this purpose. use contactors.
main isolators. fuses. etc. on site.
The terminals are located above the control panel. Remove the lid
to enable the equipment to be connected.
The following are connected at the terminals:
- the power supply of the IWS heat pump control unit
- the compressor power supply
- the brine pump power supply
- the BUS cable (J-Y (St) 2x2x0.8)
Ensure that High. Low and Ground are correctly connected.
- the enable signal for the stand-alone operation at terminal
X4/2. For this. remove the jumper between X4/L and X4/2.
The IWS (integral heat pump controller) is a PCB that is fitted as
standard into the heat pump control panel. The IWS controls the
contactors of the compressors and the starting current limiter.
receives the signal inputs for high pressure. low pressure and
central faults and contains the BUS interface to the WPM II.
Use appropriate cables in accordance with local regulations
for all connections. For this. observe the Electrical details in
"Specification" and the Electrical connection diagram.
Check the strain relief function.
Observe the operating instructions for the WPM II heat pump
manager.
Connect the circulation pump for the heat consumers in accordance
with the electrical connection diagram
or the engineering
documentation.
In case of external installation. use only weather-proof
connecting cables to VDE 0100 [or local regulations]. As a
minimum requirement. use cables with rubber sheathing with
the identification 60245 IEC 57. Route all lines inside a conduit
(protective pipe).
To prevent the heat pump from being damaged by frost in case of
external installation or when installing it in a room that is not free
from the risk of frost. fit and electrically connect the contact sensor
AVF 6 at the heating-return. The contact sensor is electrically
connected at terminals X2/4 and X2/5.
The heating circuit pumps are started when the heating-return
temperature falls to +8 °C. The reverse switching hysteresis is 4 K.
Sensor installation:
fThoroughly clean the pipe.
fApply heat conducting paste A.
fSecure the sensor with a tie.
STAND-ALONE operation
In emergencies. this heat pump can also operate without the heat
pump manager (see troubleshooting).
Route all connecting cables and sensor leads through the apertures
in the back panel.
10.8 Modules
When using a modular approach. connect the individual heat
pumps via terminal BUS 1. 2. 3. Ensure that High. Low and Ground
are correctly connected at the WPM II as well as at the heat pump.
INSTALLATION
INSTALLATION

WWW.STIEBEL-ELTRON.COM WPF 20/27/40/52/66 | 15
Power supply WPF 20. WPF 27. WPF 35, WPF 40. WPF 52. WPF 66. WPF 27 HT
Störung
X3
X5
X4
3/N/PE
~400V 50Hz
3/N/PE
~400V 50Hz
~230V 50Hz
X2
WPM II
BUS / Fühler
26�03�01�0796
X2 LV terminal
1 BUS High H
2 BUS Low L
3 BUS Ground
4 & 5 Temperature sensor B6
X3 Power supply
Heat pump (compressor)
L1. L2. L3. N. PE
X4 Control terminal
Power supply: L. N. PE
Control input:
Ext. control.STAND-ALONE operation
ON. compressor output signal
Fault message. output signal
X5 Power supply
Brine pump
L1. L2. L3. N. PE
INSTALLATION
INSTALLATION

16 | WPF 20/27/40/52/66 WWW.STIEBEL-ELTRON.COM
11. Commissioning
Only approved contractors may commission this equipment and
instruct the owner in its use.
Commission the WPF in accordance with these installation
instructions and the operating and installation instructions of the
heat pump manager WPM II. Our customer service can assist in
the commissioning. which is chargeable.
Where this heat pump is used in an installation that is intended
for commercial use. the rules of the relevant Health & Safety at
Work Act may come into play. For further details. check your local
authorising body. The function of the device. including those of
any safety equipment fitted is tested at the factory.
After commissioning. the installer should complete the
commissioning report contained in these instructions.
Check the following prior to commissioning:
Heating system
- Was the heating system filled to the correct pressure. and
was the quick-acting air vent valve opened?
Temperature sensor
- Were the outside temperature and the return temperature
sensor (in conjunction with a buffer cylinder) correctly
positioned and connected?
Power supply
- Was the mains power supply properly connected?
!
Please 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.
In this case the heat pump manager displays the fault message
"no output". Two phases should then be interchanged to alter the
direction of rotation.
When everything has been implemented correctly. the system
can be heated to its maximum operating temperature and vented
once again.
!Risk of damage!
Observe the maximum system temperature in underfloor
heating systems.
11.1 Operation and control
A WPM II heat pump manager is required to operate the heat
pump. It regulates the entire heating system. All necessary
adjustments prior and during operation are made on this device.
Only qualified contractors must make adjustments listed in the
commissioning report of the WPM II heat pump manager.
!Risk of damage!
The system does not need to be shut down during summer.
as the WPM II implements an automatic summer/winter
changeover. If the system is. nevertheless. to be shut
down. set the WPM II to standby. That way the safety
functions that protect the system remain enabled (e.g.
frost protection).
Drain the water side of the equipment. if the heat pump is taken
out of use at a location subject to a risk of frost or if it is installed
externally.
Drain the liquid contained inside the evaporator via the fill & drain
valve that becomes accessible after removing the r.h. side panel.
12. Maintenance
Danger to life through electrocution! Before any work. isolate the equipment from the power
supply at the control panel.
!
Risk of damage! Check the refrigerant circuit of the heat pump WPF 20,
27, 35, 40, 52, 66 annually for tightness in accordance
with EU Directive 842/2006.
Document tightness tests in the service record.
If heat meters are installed. frequently clean their sieves. which
block easily.
When the heat pump operation is impaired (high pressure limiter
responds) through deposits of corrosion by-products (rust sludge)
inside the condenser. only dissolving them by means of solvents
used by our customer service will remove this problem.
!
Risk of damage! Never change the factory setting of the rotary selector
on the overcurrent circuit breaker
Factory setting
WPF 52 35 A
WPF 66 45 A
A permanently set overcurrent circuit breaker is installed inside
the compressor of the WPF 20. 27 and 40.
INSTALLATION
COMMISSIONING | MAINTENANCE

WWW.STIEBEL-ELTRON.COM WPF 20/27/40/52/66 | 17
INSTALLATION
TROUBLESHOOTING
13. Troubleshooting
Checking the IWS settings
BA
3
2
1
4
26�03�01�0661
1 LEDs
2 DIP switch (BA)
3 Reset button
4 DIP switch (heat pump)
The control panel with the "Internal heat pump controller" (IWS II)
becomes accessible after removing the front hood. The following
list the adjustments of the IWS II required for the WPF:
13.1 DIP switch (heat pump)
The DIP switch (heat pump) enables the pre-selection of the
various compressor systems. Subject to the system heat pump
type. for the WPF this was set to 12 at the factory.
If the WPF is to be operated as a module with another WPF. this
setting (heat pump) remains at 12.
fPlease check whether the DIP switch (heat pump) is set
correctly.
The correct position of the slide switch can also be checked on
control level 3 on the WPM II. The display should indicate a C under
parameter "Type IWS".
13.2 DIP switch (BA)
Switches 1, 2 and 3 have no relevance to the WPF.
Position switch 4
Switch ON : STAND-ALONE operation
STAND-ALONE operation is only possible if a heat pump type has
been allocated to the WPM II under parameter IWS TYPE.
Should the WPM II heat pump manager develop a fault. the heat
pump can be operated in STAND-ALONE mode in an emergency.
In this operating mode. there is no communication with the WPM
II. The heat pump regulates to a fixed temperature: it starts up at
50 °C and shuts down at 55 °C. For this. 230 V must be applied to
terminal X4/2. and a contact sensor AVF 6 connected as a return
temperature sensor at sensor terminals X2/4 and X2/5. The
sensor must be connected to the heating return (chapter Device
description). The operating mode is indicated by the green LED
on the right.
!
Risk of damage! For STAND-ALONE operation. remove the jumper
between X4/1 and X4/2.
13.3 LEDs
Red LED:
The LED flashes when a heat pump fault occurs once. The system
will be shut down.
The red LED illuminates steady if more than 5 heat pump faults
occur within 2 hours. The system will be shut down permanently.
If the red LED is flashing or illuminated steadily, voltage of 230V
is present at the fault output (terminal X4/3).
To delete the faults from the IWS II. select Reset WP and reset
by pressing PRG on the IWS II. The internal counter will then be
returned to zero.
Heat pump faults displayed by the LED: High pressure fault / low
pressure fault. central fault message and hardware faults at the
IWS II (see fault list).
Green centre LED: Flashes during the initialisation and becomes
steady after the BUS address has been allocated. Communication
to the WPM II is only then established. This is only relevant for the
WPF. if the control unit is replaced. otherwise the unit is initialised
at the factory.
Green r.h. LED: Illuminates steady if STAND-ALONE operation has
been selected.
Reset button
In case of incorrect initialisation. see chapter 5.4.1 in the operating
and installation instructions of the WPM II.

18 | WPF 20/27/40/52/66 WWW.STIEBEL-ELTRON.COM
14. Specification
14.1 Water and brine connection
1250
860
340
470
772
900
1150
720
600
480
360
e01
e02
f01
f02
b01
D0000016833.ai
WPF 20 WPF 27 WPF 35 WPF 40 WPF 52 WPF 66 WPF 27 HT
b01 Entry electrical cables
e01 Heating flow Male thread G 2 G 2 G 2 G 2 G 2 G 2 G 2
e02 Heating return Male thread G 2 G 2 G 2 G 2 G 2 G 2 G 2
f01 Heat source flow Male thread G 2 G 2 G 2 G 2 G 2 G 2 G 2
f02 Heat source return Male thread G 2 G 2 G 2 G 2 G 2 G 2 G 2
INSTALLATION
SPECIFICATION

WWW.STIEBEL-ELTRON.COM WPF 20/27/40/52/66 | 19
14.2 Wiring diagrams for heat pump WPF 20 | 27
8
X2
K1
A2
A1
6
7
Q1
2 1
6
5 4 3
L
11
2 1
suB
Heißgas
12 10
9 8 7
H
Einfrierschutz
3
HD/ND Solepumpe N
5 4 3 2 1
3
4 5
L
M1
M
3
X3
X5
A2
9
10 11 12 13
X1
Fü relh
2 1
L1
L2 L3 N
K4
6
4
2
1 3 5
K1
6
4
2
1 3 5
14
L
N
X4
euetS.txE r.
1/N /PE AC 50Hz 230V
F2
> p
2
3/N/PE AC 50Hz 400V
3/N/PE AC 50Hz 400V
321
4
5
X23
X34 N3
X23
X29
X33
X30
21
1
X24
X24
C
T1
S
T2
R
T3
L1
L2 L3 N
K4
A1
A2
Q1
A2
A1
Q1
2
4
6
5
3
1
L3
L2
L1
T1
T2
T3
A1
A2
T <
E2
1 2 3
Anschluss Solepumpe
L
H
Kleinspannung
BUS
B6
B6
NO
F9
Z2
6
4
2
135
br ws sw br ws sw
3
4 5
2 1
X35
6
P
I
P
I
P3 P1
1 1
2 2
12-18V
X28
B5
3
rungötS
26�03�01�0853�d
A2 Integral heat pump controller IWS II B5 Hot gas temperature sensor B6 Frost sensor (only for ext. inst. or inst. in a room
not free from the risk of frost)
E2 Oil sump heater F2 High pressure limiter F9 Solar pump MCB K1 Safety contactor K4 Brine pump contactor
M1 Compressor motor
N3 Temp. controller - oil sump heater P1 High pressure transducer P3 Low pressure transducer Q1 Softstart contactor X1 Terminals X2 LV terminal
X3 Heat pump - mains X4 Control voltage terminals X5 Brine pump terminals X23 Power supply earth terminal block
X24 Power supply earth screw X28 Plug-in connector terminal strip
X29 Plug-in connector IWS II 12-PIN X30 Plug-in connector IWS II 3-PIN X33 Plug-in connector IWS II 5-PIN X34 Plug-in connector terminal strip - oil sump
heater
X35 Plug-in connector IWS II 6-PIN Z2 Supressor elemen
INSTALLATION
SPECIFICATION

20 | WPF 20/27/40/52/66 WWW.STIEBEL-ELTRON.COM
14.3 Wiring diagrams for heat pump WPF WPF 35 | 40
8
X2
K1
A2
A1
6
7
Q1
2 1
6
5 4 3
L
11
2 1
suB
Heißgas
12 10
9 8 7
H
Einfrierschutz
3
HD/ND Solepumpe N
5 4 3 2 1
3
4 5
L
X3
X5
A2
9
10 11 12 13
X1
Fü relh
2 1
L1
L2 L3 N
K4
6
4
2
1 3 5
K1
6
4
2
1 3 5
14
L
N
X4
euetS.txE r.
1/N /PE AC 50Hz 230V
F2
> p
2
3/N/PE AC 50Hz 400V
3/N/PE AC 50Hz 400V
321
4
5
X23
X34 N3
X23
X29
X33
X30
21
1
X24
L1
L2 L3 N
K4
A1
A2
Q1
A2
A1
T <
E2
1 2 3
Anschluss Solepumpe
L
H
Kleinspannung
BUS
B6
B6
NO
F9
Z2
6
4
2
135
br ws sw br ws sw
3
4 5
2 1
X35
6
P
I
P
I
P3 P1
1 1
2 2
12-18V
X28
B5
M1
M
3
6
4
2
1 3 5
X24
C
T1
S
T2
R
T3
A2
A1
K2
Q1
2
4
6
5
3
1 L3
L2
L1
T1
T2
T3
K2
23
24
A1
A2
X1 1 4
Drossel
Z1
Z1/schräg rechts Z1/schräg links
3
törungS
26�03�01�0806�d
INSTALLATION
SPECIFICATION
A2 Integral heat pump controller IWS II B5 Hot gas temperature sensor B6 Frost sensor (only for ext. inst. or inst. in a room
not free from the risk of frost)
E2 Oil sump heater F2 High pressure limiter F9 Solar pump MCB K1 Safety contactor K2 Compressor contactor K4 Brine pump contactor
M1 Compressor motor
N3 Temp. controller - oil sump heater
P1 High pressure transducer P3 Low pressure transducer Q1 Softstart contactor X1 Terminals X2 LV terminal
X3 Heat pump - mains X4 Control voltage terminals X5 Brine pump terminals X23 Power supply earth terminal block X24 Power supply earth screw X28 Plug-in connector terminal strip
X29 Plug-in connector IWS II 12-PIN
X30 Plug-in connector IWS II 3-PIN X33 Plug-in connector IWS II 5-PIN X34 Plug-in connector terminal strip - oil sump heater X35 Plug-in connector IWS II 6-PIN Z1 Supressor elemen Z2 Supressor elemen