STIEBEL ELTRON WPE-I 05 H 400 Plus User manual

Ground source heat pump 2
WPE-I 05 H 400 Plus/
WPE-I 07 H 400 Plus/
WPE-I 10 H 400 Plus/
WPE-I 13 H 400 Plus/
WPE-I 17 H 400 Plus/
WPE-I 05 HW 400 Plus/
WPE-I 07 HW 400 Plus/
WPE-I 10 HW 400 Plus
Dieses Produkt ist nur für gut isolierte Räume oder
für den gelegentlichen Gebrauch geeignet.
This product is only suitable for well insulated
spaces or occasional use.
Ce produit convient uniquement aux locaux bien
isolés ou à un usage occasionnel.
Dit product is alleen geschikt voor goed geïsoleer-
de ruimtes of voor occasioneel gebruik.
Tento výrobek je vhodný pouze pro dobře izolo-
vané prostory nebo příležitostné použití.
Tento produkt je určený len do dobre izolovaných
priestorov alebo len na príležitostné použitie.
Produkt nadaje się wyłącznie do dobrze zaizolo-
wanych pomieszczeń lub do okazjonalnego kor-
zystania.
A termék kizárólag megfelelően szigetelt helyisé-
gekben vagy alkalomszerűen használható.

Table of contents
2 | WPE-I H(W) 400 Plus www.stiebel-eltron.com
1 Special information................................................... 3
2 General information.................................................. 3
2.1 Symbols in this document ................................ 3
2.2 Units of measurement ...................................... 3
2.3 Symbols on the appliance................................. 3
2.4 Other applicable documents............................. 3
2.5 Standardised output data ................................. 3
2.6 Target groups................................................... 3
3 Safety........................................................................ 4
3.1 Structure of the warning notices....................... 4
3.2 Intended use .................................................... 4
3.3 Foreseeable misuse.......................................... 4
3.4 Safety instructions............................................ 4
4 Appliance description................................................ 5
4.1 Function description......................................... 5
4.2 Standard delivery ............................................. 5
4.3 Accessories ...................................................... 5
5 Transportation (qualified contractors) ....................... 5
6 Installation (qualified contractors)............................. 6
6.1 Installation site................................................. 6
6.2 Creating wall outlets ........................................ 7
6.3 Siting the appliance ......................................... 7
6.4 Installing and filling the brine circuit................ 7
6.5 Installing the heating circuit............................. 8
6.6 Connecting the WPE-I H to the DHW cylinder.... 9
6.7 Filling the DHW cylinder and heating circuit ..... 9
6.8 Electrical connection ........................................ 9
6.9 Temperature sensor ......................................... 10
6.10 High limit safety cut-out................................... 11
7 Commissioning (qualified contractors) ...................... 11
7.1 Checks before commissioning .......................... 11
7.2 Commissioning the appliance........................... 11
8 Cleaning (users)........................................................ 12
9 Cleaning (qualified contractors) ................................ 12
9.1 Cleaning the filter in the heating circuit and
brine circuit ..................................................... 12
10 Maintenance (qualified contractors) .......................... 12
10.1 Checking the brine level ................................... 12
10.2 Checking safety valves...................................... 12
10.3 Leak detection (refrigerant) .............................. 12
11 Troubleshooting (users) ............................................ 12
12 Troubleshooting (qualified contractors)..................... 12
12.1 Resetting the high limit safety cut-out of the
emergency/auxiliary heater.............................. 12
13 Shutdown (qualified contractors) .............................. 13
14 Specification............................................................. 13
14.1 Dimensions and connections............................ 13
14.2 Output diagrams.............................................. 15
14.3 Wiring diagram ............................................... 22
14.4 Data table........................................................ 23
15 Guarantee ................................................................ 24
16 Environment and recycling ....................................... 24

Special information
www.stiebel-eltron.com WPE-I H(W) 400 Plus | 3
1 Special information
– The following groups of people are not per-
mitted to use the appliance:
– Children
– Persons with reduced physical, sensory or mental cap-
abilities
– Persons lacking experience and expertise
– Children must never play with the appli-
ance.
– Only qualified contractors are permitted to
clean and service the appliance.
– The connection to the power supply must be
in the form of a permanent connection. En-
sure the appliance can be separated from
the power supply by an isolator that discon-
nects all poles with at least 3mm contact
separation.
– Observe all applicable national and regional
regulations and instructions during installa-
tion.
– Never install the appliance in a room con-
taining flammable surfaces.
– Before installation, never store the appli-
ance in a room where permanently active
ignition sources are present or in operation.
These include, for example, open flames,
gas appliances, electric heating appliances
or hot surfaces at temperatures >700°C.
– Only a qualified contractor authorised by the
manufacturer may carry out servicing and
repairs. Servicing may should always be
carried out according to the manufacturer's
instructions.
– Observe the applicable national gas installa-
tion regulations.
2 General information
Read these instructions carefully before using the
appliance and retain them for future reference.
Pass on these instructions along with the appliance
as necessary.
2.1 Symbols in this document
Symbol Meaning
This symbol indicates possible property damage, equip-
ment damage, consequential damage or environmental
damage.
General information is identified by the adjacent symbol.

This symbol indicates that you have to do something.
Symbol Meaning

This symbol indicates that you must fulfil certain pre-
requisites before you perform the following steps.

This symbol indicates a result or intermediate result.

These symbols indicate the software menu level (in this
example level3).
This symbol indicates a reference to the corresponding
page number (page11 in this example).
2.2 Units of measurement
All measurements are given in mm unless stated otherwise.
2.3 Symbols on the appliance
Symbol Meaning
Inlet/intake
Outlet/discharge
Heat source
Heating
DHW
2.4 Other applicable documents
– Instructions for the heat pump manager
– Operating and installation instructions for system compon-
ents
– Instructions for the accessories used
2.5 Standardised output data
Information on determining and interpreting the specified
standardised output data
Standard: EN14511
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.
Additional factors that have an influence on the test values are
the measuring equipment, the system configuration, the age of
the system and the flow rates.
A confirmation of the specified output data can only be obtained
if the conditions applicable to the relevant test match those of
the standard shown in the heading of this chapter.
2.6 Target groups
Operator
Person without specialist expert knowledge
en

Safety
4 | WPE-I H(W) 400 Plus www.stiebel-eltron.com
Qualified heating contractor
Person with specialist expert knowledge in the following areas:
heating technology, heating media, building services and engin-
eering, ventilation and air conditioning technology, measuring
technology, heat pump technology, environmental technology,
occupational safety and fire safety
Qualified electrical contractor
Person with specialist expert knowledge in the following areas:
electrical engineering, measuring technology, occupational
safety and fire safety
Apprentice
Apprentices may only carry out the assigned tasks under profes-
sional supervision and instruction.
Professional qualification
Subject to local legislation, training, a course of studies or skill
development is required.
Specialist expert knowledge applies subject to local regulations.
Gender-sensitive documentation
We endeavour to follow language changes and use gender-
aware linguistic form without compromising fluency. We aim to
recognise, include and speak to all genders in our documenta-
tion.
3 Safety
3.1 Structure of the warning notices
3.1.1 Section-specific warning notices
Section-specific warning notices apply to all steps in the section.
Injury
CAUTION
Type and source of risk
Consequence(s) of failure to observe the warning no-
tice
uHazard prevention measure(s)
Property damage, consequential losses, environmental
pollution
NOTICE
Type and source of risk
Consequence(s) of failure to observe the warning no-
tice
Hazard prevention measure(s)
3.1.2 Embedded warning notices
Embedded warning notices apply only to the subsequent step.
uSIGNAL WORD: Consequence(s) of failure to observe the
warning notice. Hazard prevention measure(s). Step to
which the warning notice refers
3.1.3 Key to symbols
Symbol Type of risk
Injury
Symbol Type of risk
Electrocution
Burns, scalding
3.1.4 Signal words
Signal
word
Meaning
DANGER Failure to observe this information will result in death or
serious injury
WARNING Failure to observe this information may result in death or
serious injury
CAUTION Failure to observe this information may result in moderate
or minor injury
NOTICE Failure to observe this information may result in property
damage, consequential losses or environmental damage
3.2 Intended use
WPE-I H 400 Plus: This appliance is designed for to heat rooms.
WPE-I HW 400 Plus: The appliance is used for DHW heating and
for heating rooms.
The appliance is designed for installation indoors.
The product is designed for domestic use. It can be used safely
by untrained persons. This product 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.
Observation of these instructions and of instructions for any ac-
cessories used is also part of the intended use of this appliance.
Permitted brine:
Type Description Part no.
MEG 10 Heat transfer medium as concentrate based
on ethylene glycol
Content: 10l
231109
MEG 30 Heat transfer medium as concentrate based
on ethylene glycol
Content: 30l
161696
3.3 Foreseeable misuse
Any other use beyond that described shall be deemed to be out-
side the intended use.
The appliance is not designed for installation in damp areas.
3.4 Safety instructions
– Failure to install and wire the appliance correctly may result
in injury. Only a qualified contractor may carry out electrical
installation and installation of the appliance.
– Safe use is not guaranteed if you install the appliance. The
appliance should only be operated once it is fully installed
and all safety equipment has been fitted.
– Opening the casing while the appliance is in operation may
cause injury. Only operate the appliance with the casing
closed.
Property damage, consequential losses, environmental
pollution
– Unsuitable spare parts and accessories may jeopardise user
and product safety. Always use original spare parts and ori-
ginal accessories.

Appliance description
www.stiebel-eltron.com WPE-I H(W) 400 Plus | 5
– If the overflow pipes are blocked, the pressure in the appli-
ance cannot be reduced. Never block the connection to the
overflow pipes for the air vent valves.
– Polluted ambient air can damage the appliance. Protect the
appliance from dust and dirt during building work.
4 Appliance description
4.1 Function description
The appliance supplies multiple draw-off points with domestic
hot water and heating water.
Appliance type WPE-I HW 400 Plus is equipped with an integral
DHW cylinder.
Appliance type WPE-I H 400 Plus can be linked to a separate
DHW cylinder (not part of the standard delivery).
Function
– A sealed refrigerant circuit routes the refrigerant from the
appliance into the ground and back again. The refrigerant
absorbs the heat from the ground and is converted in the
evaporator from a liquid to a gas.
– The compressor draws in the gaseous refrigerant and com-
presses it. This increase in pressure raises the refrigerant
temperature still further.
– In the downstream condenser, the refrigerant then transfers
heat to the heating water.
– The still prevalent pressure is then reduced and the cyclical
process starts again.
– The heating water is pumped through a DHW cylinder heat-
ing coil, heating the domestic hot water.
The lower the ground temperature and the higher the selected
set temperature, the longer the heat-up time. The heating out-
put of the heat pump drops and the demand for electrical en-
ergy increases.
Electric emergency/auxiliary heater
The appliance is equipped with an electric emergency/auxiliary
heater (DHC).
The electric emergency/auxiliary heater can be deactivated in
the heat pump manager. When it is activated, it performs the
following functions:
To safeguard heating operation, the electric emergency/auxili-
ary heater is activated if the temperature falls below the dual
mode point in mono mode operation.
The electric emergency/auxiliary heater is activated if the tem-
perature falls below the dual mode point in mono energetic op-
eration.
The electric emergency/auxiliary heater is activated if the heat
demand exceeds the heating output of the heat pump.
Heat pump manager (WPM)
The heat pump manager is an integral weather-compensated
flow temperature control unit.
The WPM regulates DHW heating to the preferred temperature
and controls the built-in electric emergency/auxiliary heater.
Detection of a leak in the brine circuit
The appliance is equipped with a brine pressure switch in the
brine circuit. The brine pressure switch prevents brine getting
into the ground if there is a leak in the brine circuit.
If the pressure in the brine circuit falls below 0.7bar, the brine
pressure switch turns the heat pump off. In order for the heat
pump to be enabled again, the pressure must be raised to at
least 1.5bar while the heat pump is on standby.
4.2 Standard delivery
– 1× outside sensor
– 1× contact sensor
– Gaskets for water line and brine line connections
4.3 Accessories
4.3.1 Required accessories
For DHW heating, a DHW cylinder with an internal indirect coil
is required. The minimum indirect coil surface area can be
found in the table.
Output Heat exchanger surface area
WPE-I 05 H 400 Plus
WPE-I 05 HW 400 Plus
WPE-I 07 H 400 Plus
WPE-I 07 HW 400 Plus
WPE-I 10 H 400 Plus
WPE-I 10 HW 400 Plus
2m²
WPE-I 13 H 400 Plus
WPE-I 17 H 400 Plus
3.2m²
4.3.2 Optional accessories
– ISG Internet Service Gateway
The ISG Internet Service Gateway enables you to operate the
heat pump within your local home network and via the internet
when you are away.
5 Transportation (qualified contract-
ors)
Observe the following information:
– The appliance casing is not designed to withstand strong
forces.
– The appliance is easier to transport in its packaging on the
pallet than if it is removed from the packaging.
uTransport the appliance at temperatures between -20°C
and +50°C.
uTransport the appliance vertically.
uTransport the appliance using a sack truck. Secure the ap-
pliance to the sack truck so that it cannot tip over and the
casing will not become damaged.
uUse the recessed grips and the bottom section of the pallet
to carry the appliance.
en

Installation (qualified contractors)
6 | WPE-I H(W) 400 Plus www.stiebel-eltron.com
D0000109538
uRemove the transport plugs from the connections for the
water lines and brine lines.
6 Installation (qualified contractors)
6.1 Installation site
The installation site must fulfil the following requirements:
– Free from the risk of frost
– No unauthorised access
– Adequate lighting
– Adequate ventilation and even distribution of air at the in-
stallation site
– Substrate
– Horizontal
– Level
– Sufficient load bearing capacity
– Water resistant
– No joist floors
– Preferably concrete floors
– Bottom drain available (recommended)
– The installation site is not subject to a risk of explosions
arising from dust, gases or vapours.
– The appliance does not impair the operation of other appli-
ances at the installation site.
6.1.1 Refrigerant
– Refrigerant must not get into adjacent rooms, open areas,
corridors or drainage systems. Route any escaping refriger-
ant or gas to the outside.
– Doors must be airtight and self-closing. They must be able
to be opened from the inside and have a fire resistance of at
least 1hour. Escaping refrigerant must not get into living
spaces.
– At least one emergency exit must lead directly outside or
into an emergency exit corridor.
6.1.2 Sound emissions
– The installation site should not be located in a corner or
close to a bedroom or living space. The surrounding walls
may amplify the noise of the appliance.
– Ensure that the entire appliance frame is in full contact with
the substrate. Uneven substrates can increase sound emis-
sions.
– Avoid installation on large, echoing floor areas, e.g.tiled
floors.
– Implement pipe outlets through walls and ceilings with
anti-vibration insulation.
– Secure the supply lines with structure-borne noise attenu-
ation on noise-sensitive walls.
– Align the appliance feet.
– For installation on floating screeds, make provisions for
quiet heat pump operation.
– Isolate the installation surface around the heat pump by
means of a recess. After completing the installation, seal
the recess with a waterproof, sound insulating material,
suchas silicone.
1 2 3 54
D0000109539
1 Concrete base 2 Impact sound insulation
3 Floating screed 4 Floor covering
5 Recess for anti-vibration ma-
terial
6.1.3 Minimum clearances
uMaintain the minimum clearances in order to ensure
trouble-free operation of the appliance and to allow enough
space for maintenance work.
WPE-I H 400 Plus
≥300
≥300 ≥600≥300 ≥50
D0000109589

Installation (qualified contractors)
www.stiebel-eltron.com WPE-I H(W) 400 Plus | 7
WPE-I HW 400 Plus
≥300
≥300 ≥600≥300 ≥50
1:1
D0000109541
6.2 Creating wall outlets
uEstablish wall outlets in the building wall with a slight fall
to the outside (minimum inclination: 1cm every 30cm).
uInsert the wall outlets with a slight fall.
uCut off the wall outlet from the top downwards at an angle
to the building wall.
uSeal the space between the wall and the wall outlet.
6.3 Siting the appliance
Unpacking the appliance
uRemove the box and packaging film.
uSlightly tip the appliance and lift it off the pallet. Use the re-
cessed grips and adjustable feet to lift it off.
Siting the appliance
uPosition the appliance on the prepared substrate.
uAlign the appliance horizontally by adjusting the feet.
Removing the transport lock
uNOTICE:Ensure that no damage is caused to the cable
between the front cover and the appliance. Take off the
front cover.
1.
2.
D0000109652
uRemove the transport lock on the bottom of the appliance.
D0000109647
6.4 Installing and filling the brine circuit
Routing the brine lines through the wall outlets
– Route the brine lines through separate wall outlets.
– Route the brine lines through the wall outlets.
– Seal the space between the brine line and wall outlet with a
suitable sealant (e.g. well foam). Ensure the brine lines are
centred in the wall outlets.
A
C
D
B
D0000082870
Wall outlet below ground
Making up the brine
uRefer to the specification to determine the brine volume in
the heat pump under operating conditions. The overall
volume is equal to the amount of brine required.
uMake up the brine by mixing undiluted glycol and water in
a separate clean container. The chloride content of the wa-
ter must not exceed 250ppm.
Ethylene glycol [%] Water [%]
Geothermal probe 25 75
Geothermal collector 33 67
uUse a refractometer to check the freezing point.
Flushing the brine circuit
üYou will need an external pump to fill the brine circuit.
uConnect the pressure side of the external pump to the filling
unit.
ðWe recommend brine filling unit WPSF.
en

Installation (qualified contractors)
8 | WPE-I H(W) 400 Plus www.stiebel-eltron.com
Charging the brine circuit
uNOTICE:Foreign bodies, such as rust or sealing material,
can impair the operational reliability of the heat pump. Be-
fore connecting the heat pump to the heat source circuit,
flush the pipework thoroughly with brine.
uConnect the appliance to the brine circuit.
uInstall a diaphragm expansion vessel on the brine side. En-
sure that the pre-charge pressure is at 0.5bar.
uTo prevent the brine pressure switch turning the heat pump
off when there is no leak, charge the heat source side of the
heat pump to a pressure of 1.5‑3bar.
uCharge the system according to the following curve to pre-
vent an unintentional response from the brine pressure
switch.
0
0,5
1
1,5
2
2,5
3
0 200 400 600 800
1
2
D0000058692
X System volume [l] 1 Required fill pressure de-
pending on system volume at
33% brine
Y Charge pressure [bar] 2 Required fill pressure de-
pending on system volume at
25% brine
1:1
D0000109648
uVent the brine circuit.
uDetermine the density of the glycol/water mixture.
uThe concentration based on the measured density and tem-
perature can be found on 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
D0000103023
X Temperature A Frost protection
Y Density
uInsulate all brine lines with vapour diffusion-proof thermal
insulation.
uCheck the pre-charge pressure of the diaphragm expansion
vessel on the brine side.
uIf necessary, adjust the pre-charge pressure. The system fill
pressure must be higher than the pre-charge pressure plus
the max. pressure differential of the heat pump.
6.5 Installing the heating circuit
üThe heating system to which the appliance is connected has
been installed by a qualified contractor in accordance with
the installation diagrams that are part of the technical
guides.
üA diaphragm expansion vessel has been installed.
üSafety valves (max. opening pressure 3bar) are installed.
uLay the pipework for the heating circuit.
uNOTICE:Foreign bodies, such as welding pearls, rust or
sealing material, can impair the operational reliability of
the appliance. Flush the pipework thoroughly before con-
necting the appliance.
uInstall a dirt trap (maximum mesh size 0.7mm) in the heat-
ing return in the immediate vicinity of the appliance.
uInstall a safety valve with a maximum opening pressure of
10bar on the cold water inlet of the DHW cylinder. Note the
position of any non-return valves.
uConnect the heat pump on the heating side.
uProvide thermal insulation.
uWhen sizing the heating circuit, observe the internal pres-
sure differential (see chapter Data table [}23] ).

Installation (qualified contractors)
www.stiebel-eltron.com WPE-I H(W) 400 Plus | 9
Heating circuit oxygen diffusion
If oxygen gets into the heating system, steel parts may become
corroded, e.g. the indirect coil in the DHW cylinder or the buffer
cylinder. The products of corrosion (e.g. rusty sludge) can settle
in the heating system components. This may cause the pipe
cross-sections to narrow, leading to a lower output.
uUse oxygen diffusion-proof pipes and hoses (e.g. multi-
layer composite pipes).
uIf you have an open vented heating system, separate the
heating circuit from the buffer cylinder. For example, you
could use a plate heat exchanger for this.
6.6 Connecting the WPE-I H to the DHW cylinder
A three-way valve is integrated into the appliance for switching
between the DHW heating circuit and the central heating circuit.
uThoroughly flush the pipework before connecting the heat
pump. Foreign bodies, such as rust, sand and sealant, can
impair the operational reliability of the heat pump.
uWe recommend installing our filter assembly in the DHW
heating circuit.
uConnect the DHW inlet of the heat pump to the upper coil
connection of the DHW cylinder.
uConnect the DHW return of the heat pump to the lower coil
connection of the DHW cylinder.
uCAUTION:Water discharged from the safety valve overflow
pipe may be hot. Route away any water discharged from
the overflow pipe via a bottom drain.
Using a heat pump without DHW heating
uDeactivate the function for DHW heating in the WPM.
6.7 Filling the DHW cylinder and heating circuit
Before filling, check that
üThe pipe connections have been installed according to the
water installation diagrams in the technical guides.
üA diaphragm expansion vessel has been installed.
üIn heating systems with a sealed unvented diaphragm ex-
pansion vessel, a safety valve and a pressure gauge have
been installed.
üA fill connector with a non-return valve has been installed.
uTo prevent damage to the appliance, observe the limits for
the fill water. Soften or desalinate the fill water if required.
– With a conductivity >1000μS/cm, desalination treatment is
recommended in order to avoid corrosion.
– If you treat the fill water with inhibitors or additives, the
same limits apply as for desalination.
– Recheck these limits 8-12weeks after commissioning and
during the annual service.
Filling the DHW cylinder and heating circuit
üThe front cover of the heat pump is removed.
uOpen a DHW draw-off point.
ðThe DHW cylinder is filled.
uNOTICE:High flow rates or water hammer can damage the
appliance. Fill the appliance at a low flow rate. Fill the
heating circuit with water up to a pressure of 1bar.
uVent the heating coil of the DHW cylinder via the air vent
valve on the DHW cylinder e07 (WPE-I HW 400 Plus) or via
the air vent valve on the external DHW cylinder (WPE-I H
400 Plus).
uSwitch off the circulation pump.
uVent the indirect coil above the circulation pump.
1:1
D0000109648
uFill the heating system until the pressure is approx. 1bar.
uRepeat the entire process until there is no more air left in
the heating system.
uCheck the heating system for leaks.
uLeave the radiator valves fully open.
Determining the fill pressure
uCalculate the pre-charge pressure:
P0 = ∆h
10 + 0,2 bar
D0000081230
ðThe heating system fill pressure is increased.
uFill the heating system to the appropriate pressure
(P0+0.3bar). Observe the safety valve's response pressure
of 3bar.
6.8 Electrical connection
üYou must have permission to connect the appliance from
the relevant power supply utility (PSU).
üThe heating system has been filled.
üThe cover is removed.
uLay the electrical cables through the cable entry in the up-
per cover.
Connection version1
uInstall cables with the following cross-sections in accord-
ance with the respective fuse protection:
Model Com-
pressor
Compressor with electric emergency/
auxiliary heater
Com-
pressor +
3kW
(stage1)
Com-
pressor +
6kW
(stage2)
Compressor
+ 9kW
(stage3)
WPE-I 05 H
400 Plus
WPE-I 05 HW
400 Plus
6A 10A 16A 20A
en

Installation (qualified contractors)
10 | WPE-I H(W) 400 Plus www.stiebel-eltron.com
Model Com-
pressor
Compressor with electric emergency/
auxiliary heater
Com-
pressor +
3kW
(stage1)
Com-
pressor +
6kW
(stage2)
Compressor
+ 9kW
(stage3)
WPE-I 07 H
400 Plus
WPE-I 07 HW
400 Plus
6A 13A 16A 20A
WPE-I 10 H
400 Plus
WPE-I 10 HW
400 Plus
10A 13A 16A 20A
WPE-I 13 H
400 Plus 10A 16A 20A 25A
WPE-I 17 H
400 Plus 13A 20A 25A 32A
Compressor, electric emergency/auxiliary heater, heat pump
manager and circulation pumps have separate internal fuse
protection.
uStrip 15mm of insulation off the wires.
uConnect a 5-core 400V cable.
400V ~3N
L1 L2 L3 N PE PE 2L 2N PE
D0000110765
uIf an RCD is required for the installation, connect the heat
pump to a separate RCD (minimum 30mA).
The jumpers remain connected as in factory setting.
Connection version2
Required step Compressor, elec-
tric emergency/aux-
iliary heater
Heat pump manager
and circulation
pumps
uRemove the
jumpers and
dispose of
them.
uStrip insulation
off the wires.
15mm 12mm
uConnect the
components to
the appropriate
mains power
supply.
400V 230V
This will ensure that, in the event of a power-OFF by the power
supply utility, the circulation pumps and the heat pump man-
ager will continue to be supplied with power; the compressor is
switched off.
400V ~3N
230V ~1N
L1 L2 L3 N PE PE 2L 2N PE
D0000110766
uIf an RCD is required for the installation, connect the heat
pump to a separate RCD (minimum 30mA).
uFit the cover.
See also
2Electrical connection [}9]
6.9 Temperature sensor
Outside temperature sensor
üThe minimum clearances are observed: 2.5m above the
ground, and 1m to the side of windows and doors.
üThe installation site is not above windows, doors or air
ducts.
üThe outside temperature sensor is freely exposed to the ele-
ments but not in direct sunlight.
üThe front cover of the heat pump is removed.
uRemove the cover of the outside temperature sensor.
uFasten the lower section using the fixing materials neces-
sary for installation on the required wall.
uGuide the sensor lead through the designated entry in the
cover of the heat pump.
uConnect the outside temperature sensor.
1
D0000110518
1 T35: Terminal for outside
temperature sensor
uFit the front heat pump cover.

Commissioning (qualified contractors)
www.stiebel-eltron.com WPE-I H(W) 400 Plus | 11
uReplace the cover.
ðThe cover clicks audibly into place.
Contact sensor AVF 6
Install the sensor in the heating circuit flow if you wish to use a
mixer circuit.
uClean the mixer circuit pipe.
uApply heat conducting paste.
uSecure the sensor with a cable tie.
Sensor resistance values:
Temperature [°C] PT1000 sensor
Resistance [Ω]
- 30 882
- 20 922
-10 961
0 1000
10 1039
20 1078
25 1097
30 1117
40 1155
50 1194
60 1232
70 1271
80 1309
90 1347
100 1385
110 1423
120 1461
uConnect the sensor.
1
D0000110518
1 T33: Terminal for contact
sensor
6.10 High limit safety cut-out
NOTICE
Property damage
Excessively high flow temperatures may damage the
underfloor heating system.
uUse a high limit safety cut-out to limit the system
temperature in the event of a fault.
We recommend using high limit safety cut-out STB-FB.
uInstall the high limit safety cut-out according to the corres-
ponding instructions.
7 Commissioning (qualified contract-
ors)
Our customer support can assist with commissioning, which is a
chargeable service.
If this appliance is intended for commercial use, observe the
rules of the relevant Health & Safety at Work Act during com-
missioning. For further details, check with your local author-
ising body (e.g. TÜV in Germany).
7.1 Checks before commissioning
7.1.1 Heating circuit
– Have you filled the heating system to the correct pressure?
– Have you vented the heat exchanger (condenser)?
7.1.2 Brine circuit
– Have you filled the brine circuit to the correct pressure?
– Have you vented the brine circuit?
7.1.3 Temperature sensor
– Have you correctly connected and positioned the sensors?
7.1.4 High limit safety cut-out of the emergency/auxiliary
heater
At ambient temperatures of below -15°C, the high limit safety
cut-out of the electric emergency/auxiliary heater may trip.
uCheck whether the high limit safety cut-out has tripped.
uRemove the cause of the fault.
D0000110518
uReset the high limit safety cut-out by pressing the reset but-
ton.
7.1.5 Power supply
– Have you correctly connected the power supply?
7.2 Commissioning the appliance
To commission the appliance, observe the instructions for the
controller.
en

Cleaning (users)
12 | WPE-I H(W) 400 Plus www.stiebel-eltron.com
8 Cleaning (users)
uNOTICE:To prevent damage to components, never use ab-
rasive or corrosive cleaning agents. Clean plastic and sheet
metal parts with a damp cloth.
9 Cleaning (qualified contractors)
Component Interval
Filters in the heating circuit and
brine circuit In the first year: 2× per year
Adapt the interval according to the
water quality and the installation
conditions in subsequent years.
9.1 Cleaning the filter in the heating circuit and
brine circuit
Cleaning filters can let air into the brine circuit or heating cir-
cuit, which may cause operating faults. Information about
cleaning magnetite filters can be found in the instructions
provided by the filter manufacturer.
Heating circuit
üYou have a cloth to hand for any discharged water.
uSwitch off the heat pump.
uClose the shut-off valve.
uTake off the cover.
uRemove the filter.
uClean the filter.
uReinsert the filter.
uEnsure that the gasket ring on the cover is not damaged.
uFit the cover.
uOpen the appliance shut-off valve.
uStart the heat pump.
Brine circuit
Ask STIEBEL ELTRON customer service for recommendations for
the brine circuit filter.
10 Maintenance (qualified contractors)
Component Activity Interval
Entire appliance Check operating pres-
sure Every 2years
Entire appliance Leak test (visual check) Every 2years
Entire appliance Check brine level Every 2years
Safety valves outside
the heat pump unit Check whether the mechanism is clogged
with deposits.
4× per year
10.1 Checking the brine level
uCheck the brine level using the brine filling unit or the
WPM.
uIf the brine level is below ⅓, check the brine circuit for
leaks and top it up (see chapter Installing and filling the
brine circuit [}7] ).
10.2 Checking safety valves
The safety valve of the DHW cylinder is located on the supply
line to the cold waterinlet.
uNOTICE:There is a risk of damage to the water tank if the
safety valve is not checked regularly. Check whether the
mechanism is clogged by deposits: turn the cap clockwise a
quarter of a turn until water is discharged from the over-
flow pipe.
uNever block the connection to the overflow pipes for the
safety valves. Excess pressure must always be able to es-
cape.
10.3 Leak detection (refrigerant)
üNever use leak detection fluids that contain chlorine. Other-
wise, the chlorine may react with the refrigerant and could
corrode the copper pipes.
üNever use potential ignition sources for leak detection.
uIf you suspect a leak, ensure that there are no open flames.
uUse electronic leak detectors or suitable leak detection flu-
ids.
uSet the leak detectors to a percentage of the lower flam-
mability limit of the refrigerant.
– Flammability limit LFL of R452B: 0.31 kg/m3
uCalibrate the leak detector in an area that is not contamin-
ated by refrigerant.
uWhen soldering or welding a leak, ensure that the area is
adequately ventilated. Remove all refrigerant from the sys-
tem.
11 Troubleshooting (users)
Fault Possible cause Remedy
There is no hot water
or the heating system
remains cold.
No voltage at the ap-
pliance. Check the fuses/ MCBs in your fuse box/ dis-
tribution board. Re-
place the fuses/reset
the MCBs if required.
Notify a qualified con-
tractor if the fuses/
MCBs blow/trip again
after switching the
system back on.
uIf you cannot remedy the fault, contact a qualified con-
tractor.
uTo facilitate and speed up your enquiry, please provide the
qualified contractor with the number from the type plate.
uObserve the instructions for the WPM.
12 Troubleshooting (qualified con-
tractors)
12.1 Resetting the high limit safety cut-out of the
emergency/auxiliary heater
If the heating water temperature exceeds 95 °C, the electric
emergency/auxiliary heater shuts down.
uNOTICE:Ensure that no damage is caused to the cable
between the front cover and the appliance. Take off the
front cover.

Shutdown (qualified contractors)
www.stiebel-eltron.com WPE-I H(W) 400 Plus | 13
1.
2.
D0000109652
uRemove the cause of the fault.
uReset the high limit safety cut-out by pressing the reset but-
ton.
D0000110518
uCheck whether the heating water is being circulated at a
sufficiently high flow rate.
uInstall the front cover.
13 Shutdown (qualified contractors)
There is no need to shut the system down in summer. The heat
pump manager has an automatic summer / winter changeover.
Standby mode
uActivate standby mode. This retains the safety functions de-
signed to protect the system (e.g. frost protection).
Interrupting the power supply
If you interrupt the power supply, drain the water side of the
system when there is a risk of frost. For this, proceed as follows:
uSwitch off the appliance and disconnect it from the power
supply.
uClose the cold water inlet.
uDisconnect the water supply lines and water drains from the
appliance.
uUse a suction hose to drain the DHW cylinder from the top.
14 Specification
14.1 Dimensions and connections
600
1410
1360
707
75
175
275
445
525
487
b01
65
f02
f01
e22
e01
e02
20-50
D0000109629
WPE-I H 400 Plus
en

Specification
14 | WPE-I H(W) 400 Plus www.stiebel-eltron.com
1840
1770
600 707
148
272
327
445
449
526
f02
b01
493
f01
64
350
523
20-50
e01
e02 e07
c01
c06
D0000109665
WPE-I HW 400 Plus
WPE-I 05
H 400
Plus
WPE-I 07
H 400
Plus
WPE-I 10
H 400
Plus
WPE-I 13
H 400
Plus
WPE-I 17
H 400
Plus
WPE-I 05
HW 400
Plus
WPE-I 07
HW 400
Plus
WPE-I 10
HW 400
Plus
b01 Entry electrical cables
c01 Cold water inlet Diameter mm - - - - - 22 22 22
c06 DHW outlet Diameter mm - - - - - 22 22 22
e01 Heating flow Diameter mm 22 22 22 28 28 22 22 22
e02 Heating return Diameter mm 22 22 22 28 28 22 22 22
e07 Ventilation Diameter mm - - - - - 22 22 22
e22 Cylinder flow Diameter mm 22 22 22 22 22 - - -
f01 Heat source flow Diameter mm 28 28 28 28 28 28 28 28
f02 Heat source return Diameter mm 28 28 28 28 28 28 28 28

Specification
www.stiebel-eltron.com WPE-I H(W) 400 Plus | 15
14.2 Output diagrams 14.2.1 WPE-I 05 H(W) 400 Plus
Heating output
WPE-I_05_Plus_Waermeleistung
Flow temperature of the heat pump [°C]
X Temperature of heat source system [°C] 1 35°C 3 55°C
Y Heat pump heating output 2 45°C 4 60°C
Power consumption
WPE-I_05_Plus_Leistungsaufnahme
Flow temperature of the heat pump [°C]
X Temperature of heat source system [°C] 1 35 3 55
Y Electrical power consumption of the heat pump with auxiliary
drives 2 45 4 60
en

Specification
16 | WPE-I H(W) 400 Plus www.stiebel-eltron.com
Coefficient of performance
WPE-I_05_Plus_Leistungszahl
Flow temperature of the heat pump [°C]
X Temperature of heat source system [°C] 1 35 3 55
Y Coefficient of performance 2 45 4 60
14.2.2 WPE-I 07 H(W) 400 Plus
Heating output
WPE-I_07_Plus_Waermeleistung
Flow temperature of the heat pump [°C]
X Temperature of heat source system [°C] 1 35°C 3 55°C
Y Heat pump heating output 2 45°C 4 60°C

Specification
www.stiebel-eltron.com WPE-I H(W) 400 Plus | 17
Power consumption
WPE-I_07_Plus_Leistungsaufnahme
Flow temperature of the heat pump [°C]
X Temperature of heat source system [°C] 1 35 3 55
Y Electrical power consumption of the heat pump with auxiliary
drives 2 45 4 60
Coefficient of performance
WPE-I_07_Plus_Leistungszahl
Flow temperature of the heat pump [°C]
X Temperature of heat source system [°C] 1 35 3 55
Y Coefficient of performance 2 45 4 60
en

Specification
18 | WPE-I H(W) 400 Plus www.stiebel-eltron.com
14.2.3 WPE-I 10 H(W) 400 Plus Heating output
WPE-I_10_Plus_Waermeleistung
Flow temperature of the heat pump [°C]
X Temperature of heat source system [°C] 1 35°C 3 55°C
Y Heat pump heating output 2 45°C 4 60°C
Power consumption
WPE-I_10_Plus_Leistungsaufnahme
Flow temperature of the heat pump [°C]
X Temperature of heat source system [°C] 1 35 3 55
Y Electrical power consumption of the heat pump with auxiliary
drives 2 45 4 60

Specification
www.stiebel-eltron.com WPE-I H(W) 400 Plus | 19
Coefficient of performance
WPE-I_10_Plus_Leistungszahl
Flow temperature of the heat pump [°C]
X Temperature of heat source system [°C] 1 35 3 55
Y Coefficient of performance 2 45 4 60
14.2.4 WPE-I 13 H 400 Plus
Heating output
WPE-I_13_Plus_Waermeleistung
Flow temperature of the heat pump [°C]
X Temperature of heat source system [°C] 1 35°C 3 55°C
Y Heat pump heating output 2 45°C 4 60°C
en

Specification
20 | WPE-I H(W) 400 Plus www.stiebel-eltron.com
Power consumption
WPE-I_13_Plus_Leistungsaufnahme
Flow temperature of the heat pump [°C]
X Temperature of heat source system [°C] 1 35 3 55
Y Electrical power consumption of the heat pump with auxiliary
drives 2 45 4 60
Coefficient of performance
WPE-I_13_Plus_Leistungszahl
Flow temperature of the heat pump [°C]
X Temperature of heat source system [°C] 1 35 3 55
Y Coefficient of performance 2 45 4 60