STIEBEL ELTRON WPL 10 I Operation Instruction

Brand: STIEBEL ELTRON

Model: WPL 10 I

Category: Oxygen Equipment

Type: Operation Instruction

This manual is also suitable for

OPERATION AND INSTALLATION

Compact air source heat pump

» WPL 10 I

» WPL 10 IK 3

2 | WPL 10 www.stiebel-eltron.com

CONTENTS

SPECIAL INFORMATION

OPERATION

1. General information ��3

1.1 Relevant documents_____________________________________________ 3

1.2 Safety instructions _______________________________________________ 3

1.3 Other symbols in this documentation _______________________ 4

1.4 Units of measurement __________________________________________ 4

1.5 Standardised output data ______________________________________ 4

2. Safety �� 4

2.1 Intended use ______________________________________________________ 4

2.2 General safety instructions ____________________________________ 4

2.3 Test symbols ______________________________________________________ 4

3. Appliance description ��4

3.1 Properties _________________________________________________________ 4

3.2 Function ___________________________________________________________ 5

4. Settings �� 5

5. Maintenance and care ��5

6. Troubleshooting ��5

INSTALLATION

7. Safety �� 6

7.1 General safety instructions ____________________________________ 6

7.2 Instructions, standards and regulations ____________________ 6

8. Appliance description ��6

8.1 Standard delivery ________________________________________________ 6

8.2 Accessories ________________________________________________________ 6

8.3 Details on energy consumption _______________________________ 6

9. Preparations ��7

9.1 Electrical installation____________________________________________ 8

10. Installation ��8

10.1 Transport __________________________________________________________ 8

10.2 Siting _______________________________________________________________ 8

10.3 Heating water connection ______________________________________ 8

10.4 Oxygen diffusion _________________________________________________ 9

10.5 Filling the heating system _____________________________________ 9

10.6 Venting the heating system ____________________________________ 9

10.7 Safety temperature controller for underﬂoor heating

system _____________________________________________________________ 9

10.8 Buffer cylinders __________________________________________________ 9

10.9 Flow rate, heating side ________________________________________ 10

10.10 Condensate drain _______________________________________________ 11

10.11 Second heat generator ________________________________________ 11

10.12 Removing the casing parts ___________________________________ 11

11. Power supply �� 12

11.1 General ___________________________________________________________ 12

11.2 Electrical connection WPL10I _______________________________ 12

11.3 Electrical connection WPL10IK3 ___________________________ 12

11.4 Connecting compressor and electric emergency/

booster heater ___________________________________________________ 13

11.5 Control voltage connection ___________________________________ 14

11.6 Low voltage connection _______________________________________ 14

12. Fitting casing components �� 14

13. Fitting air hoses �� 15

13.1 WPL 10 I ___________________________________________________________ 15

13.2 WPL 10 IK 3 _______________________________________________________ 16

14. Commissioning �� 16

14.1 Checks before commissioning the heat pump manager 16

14.2 Commissioning the heat pump manager __________________ 16

14.3 Initial start-up ___________________________________________________ 16

15. Shutdown �� 17

15.1 Standby mode ___________________________________________________ 17

15.2 Power interruption _____________________________________________ 17

16. Appliance handover �� 17

17. Troubleshooting �� 18

17.1 Controls on the IWS ____________________________________________ 18

17.2 Fan noise _________________________________________________________ 18

18. Maintenance �� 18

19. Speciﬁcation �� 19

19.1 Dimensions and connections WPL10I _____________________ 19

19.2 Dimensions and connections WPL10IK3 _________________20

19.3 Wiring diagram WPL10I ______________________________________ 21

19.4 Wiring diagram WPL10IK3 __________________________________22

19.5 Output diagrams WPL10I | WPL10IK3 ___________________ 23

19.6 Data table ________________________________________________________ 24

GUARANTEE

ENVIRONMENT AND RECYCLING

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SPECIAL INFORMATION | OPERATION

General information

SPECIAL INFORMATION

- The appliance may be used by children aged8

and up and persons with reduced physical, sen-

sory or mental capabilities or a lack of experience

and know-how, provided that they are supervised

or they have been instructed on how to use the

appliance safely and have understood the result-

ing risks. Children must never play with the ap-

pliance. Children must never clean the appliance

or perform user maintenance unless they are

supervised.

- The connection to the power supply must be in

the form of a permanent connection. Ensure the

appliance can be separated from the power sup-

ply by an isolator that disconnects all poles with

at least 3mm contact separation.

- Maintain the minimum clearances to ensure trou-

ble-free operation of the appliance and facilitate

maintenance work.

- Never interrupt the heat pump power supply,

even outside the heating season. Otherwise, sys-

tem frost protection is not guaranteed.

- The heat pump manager automatically switches

the heat pump to summer or winter mode.

- If the heat pump and frost protection are com-

pletely switched off, drain the system on the

water side.

OPERATION

1. General information

The chapters "Special Information" and "Operation" are intended

for both the user and qualiﬁed contractors.

The chapter "Installation" is intended for qualiﬁed contractors.

Note

Read these instructions carefully before using the appli-

ance and retain them for future reference.

Pass on the instructions to any new user where appro-

priate.

1.1 Relevant documents

 Operating and installation instructions for the WPM heat

pump manager

 Operating and installation instructions of all other com-

ponents in the system

1.2 Safety instructions

1.2.1 Structure of safety instructions

KEYWORD Type of risk

Here, possible consequences are listed that may result

from failure to observe the safety instructions.

 Steps to prevent the risk are listed.

1.2.2 Symbols, type of risk

Symbol Type of risk

Injury

Electrocution

1.2.3 Keywords

KEYWORD Meaning

DANGER Failure to observe this information will result in serious

injury or death.

WARNING Failure to observe this information may result in serious

injury or death.

CAUTION Failure to observe this information may result in non-seri-

ous or minor injury.

OPERATION

Safety

4 | WPL 10 www.stiebel-eltron.com

1.3 Other symbols in this documentation

Note

General information is identiﬁed by the adjacent symbol.

 Read these texts carefully.

Symbol Meaning

Material losses

(appliance damage, consequential losses and environmen-

tal pollution)

Appliance disposal

 This symbol indicates that you have to do something. The ac-

tion you need to take is described step by step.

1.4 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.

2. Safety

2.1 Intended use

This appliance is intended for domestic use. It can be used safely

by untrained persons. The appliance can also be used in a non-do-

mestic 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.

2.2 General safety instructions

WARNING Injury

The appliance may be used by children aged 8 and older

and persons with reduced physical, sensory or mental

capabilities or a lack of experience and know-how, pro-

vided that they are supervised or they have been in-

structed on how to use the appliance safely and have

understood the resulting risks. Children must never play

with the appliance. Children must never clean the ap-

pliance or perform user maintenance unless they are

supervised.

2.3 Test symbols

See type plate on the appliance.

3. Appliance description

3.1 Properties

The appliance is an air source heat pump designed for

use as a heating heat pump. The appliance extracts heat

from the outdoor air at a low temperature level and trans-

fers it to the heating water at a higher temperature level.

The heating water can be heated up to a ﬂow temperature of 60 °C.

The appliance is equipped with an electric emergency/booster

heater (DHC). If the dual mode point is undershot in mono mode

operation, the electric emergency/booster heater is activated to

safeguard heating operation and the provision of high DHW tem-

peratures. In such a case in mono energetic operation, the electric

emergency/booster heater is activated as a booster heater.

This appliance has further operational characteristics:

- Suitable for underﬂoor and radiator heating.

- Preferred for low temperature heating systems.

- Extracts heat from the outdoor air even at outside tempera-

tures of -20 °C.

- Corrosion-protected, external casing made from hot-dipped

galvanised sheet steel plus stove-enamelled ﬁnish.

- Comprises all components and safety equipment required for

operation.

- Filled with non-combustible safety refrigerant.

Note

For centralised control of the heating system, you would

need the WPM heat pump manager.

OPERATION

Settings

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3.2 Function

Heat is extracted from the outdoor air via the heat exchanger

(evaporator) on the air side. The refrigerant evaporates and is

compressed by a compressor. This process requires electrical

energy.

The refrigerant is then at a higher temperature level and transfers

the heat drawn from the air to the heating system via an additional

heat exchanger (condenser). During this process, the refrigerant

expands and the cycle begins again.

At air temperatures below approx. 7°C, the humidity in the air

condenses as hoarfrost on the evaporator ﬁns. Any hoarfrost is au-

tomatically defrosted. Water created from this defrosting process

collects in the defrost pan and is drained off via a hose.

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 or heating circuit. The heat pump automatically

reverts to heating mode at the end of the defrost cycle.

Special features of the WPL10IK3

The WPL10IK3 is equipped as standard with the WPM heat pump

manager. It is also equipped with a heating circuit pump, an expansion

vessel and a three-way valve for changeover between the heating circuit

and DHW heating. The standard delivery also includes the air hoses and

their ﬁxing materials.

4. Settings

The system is operated exclusively with the WPM heat pump man-

ager.

 Please observe the heat pump manager operating and instal-

lation instructions.

5. Maintenance and care

Damage to the appliance and environment pollution

Maintenance work, such as checking the electrical safety,

must only be carried out by a qualiﬁed contractor.

 Protect the appliance from dust and dirt ingress dur-

ing building work.

A damp cloth is sufﬁcient for cleaning all plastic and sheet metal

parts. Never use abrasive or corrosive cleaning agents.

 Every month, check that the condensate drain is working

correctly (visual inspection). When doing so, check whether

water is collecting below or next to the appliance. Observe

the "Troubleshooting" chapter.

We recommend an annual inspection (to establish the current

condition of the system), and service by a contractor if required

(to return the system into its original condition).

6. Troubleshooting

Fault Cause

 Remedy

There is no hot

water or the

heating system

stays cold.

No power at the appli-

ance.

Check the fuses/ MCBs in your

fuse box/distribution panel.

If required, reset the MCBs. If

the MCBs trip again after being

reset, notify your contractor.

Water is leaking

from the appli-

ance.

The condensate drain

may be blocked.

Call your contractor to have the

condensate drain cleaned out.

Condensate is

collecting on the

outside of the

appliance or the

air hoses.

The drying out phase of

the building is not yet

complete.

If the room is sufficiently well

ventilated and dehumidified,

this condensate should no

longer form on the appliance ap-

prox.two years after the house

was built.

The relative humidity in

the air is high (≥60%).

A change in weather conditions

should no longer cause conden-

sation to form on the appliance.

The appliance is sited

in a damp room. Damp

rooms are those where

humidity in the air is high

due to the drying of laun-

dry, for example.

Ensure that the room is ade-

quately ventilated and dehumid-

ified. If necessary, hang your

laundry in a different room.

Use a vented tumble dryer.

Please note that condenser

tumble dryers do not reduce the

humidity in the air.

The air hoses are incor-

rectly fitted or poorly

sealed.

Cold air escapes.

Check whether the air hoses

are correctly fitted and sealed.

If necessary, refer to your con-

tractor.

If you cannot remedy the fault, notify your contractor. To facilitate

and speed up your enquiry, please provide the serial number from

the type plate. The type plate is located at the front top, on the

right or left hand side of the casing.

Sample type plate

Montageanweisung beachten! Dichtheit geprüft!

Made in Germany

*xxxxxxxxxxxxxxxxxx*

26_03_01_1736

1 Number on the type plate

6 | WPL 10 www.stiebel-eltron.com

INSTALLATION

Safety

INSTALLATION

7. Safety

Only a qualiﬁed contractor should carry out installation, commis-

sioning, maintenance and repair of the appliance.

7.1 General safety instructions

We guarantee the trouble-free function and operational reliabil-

ity only if original accessories and spare parts intended for the

appliance are used.

7.2 Instructions, standards and regulations

Note

Observe all applicable national and regional regulations

and instructions.

8. Appliance description

For outdoor installation the appliance offers additional frost pro-

tection of the heating water pipes. The integral frost protection

circuit starts the heating circuit pump in the heat pump circuit

automatically at +8°C condenser temperature, and thereby en-

sures circulation in all water-ﬁlled sections.

The heat pump starts automatically when the temperature in the

heat pump circuit drops below +5°C.

8.1 Standard delivery

8.1.1 WPL 10 I

The following are delivered with the appliance:

- Wiring diagram

8.1.2 WPL 10 IK 3

The following are delivered with the appliance:

- 2 x air hose with ﬁxing materials

- Wiring diagram

8.2 Accessories

Designation

Heat pump manager in wall mounted enclosure, WPMW (WPL10I only)

Pressure hoses SD25 or SD32

Wall duct with external wall grille AWG315SR

Wall duct with external wall grille AWG315GL

Thermally insulated air hose, 4m (WPL10I only)

Hose connection panel

Condensate pump PK10

Cylinder SBP200E

Cylinder SBP400E

Cylinder SBP700E

Heat pump manager in wall mounted enclosure, WPMW (WPL10I only)

Heat pump manager as control panel mounted version, WPMS (WPL10I only)

Mixer module with wall mounting enclosure, MSMW

Designation

Mixer module as control panel mounted version, MSMS

Pressure hose G 1¼” x 1m

Pressure hose G 1¼” x 2 m

Pressure hose G 1¼” x 5 m

Pressure hose G 1¼” x 10 m

Heat pump compact installation WPKI 5

UP kit 25 / 7E (for WPKI5)

Remote control for heating systems FE 7

Contact sensor AVF 6

Immersion sensor TF 6

STB-FB safety temperature controller for underfloor heating

Filter assembly 22 mm (FS-WP 22)

Filter assembly 28 mm (FS-WP 28)

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INSTALLATION

Preparations

9. Preparations

Note

The appliance is designed for internal installation, except

in damp areas.

- Never install on joists.

 Never install the appliance directly below or next to living

rooms or bedrooms.

 Never direct the air intake and discharge apertures in exter-

nal walls towards neighbouring windows or living rooms/

bedrooms.

 Protect pipe transitions through walls and ceilings with an-

ti-vibration insulation.

Note

For details regarding the sound power level, see chapter

"Speciﬁcation / Data table".

The room in which the appliance is to be installed must meet the

following conditions:

- Free from the risk of frost.

- The room must not be subject to a risk of explosions arising

from dust, gases or vapours.

- When installing the appliance in a boiler room together with

other heating equipment, ensure that the operation of other

heating equipment will not be impaired.

- Minimum volume of the installation room. The minimum

volume of the installation room is assured if the minimum

clearances are observed.

- Load-bearing ﬂoor (for the weight of the appliance, see

chapter "Speciﬁcation / Data table").

 For installation on ﬂoating screeds, make provisions for a

quiet heat pump operation.

 Isolate the mounting surface around the heat pump by a re-

cess. After completing the installation, seal the recess with

a water-impervious and sound insulating material, such as

silicone for example.

1 2 3 54

26_03_01_1466

1 Concrete base

2 Impact sound insulation

3 Floating screed

4 Floor covering

5 Recess

Minimum clearances WPL10I

≥500

≥200

≥600

≥500

≥1000

D0000019289

Minimum clearances WPL10IK3

≥500

≥200

≥500

≥1000

D0000019298

 Maintain the minimum clearances to ensure trouble-free op-

eration of the appliance and facilitate maintenance work.

8 | WPL 10 www.stiebel-eltron.com

INSTALLATION

Installation

9.1 Electrical installation

DANGER Electrocution

Carry out all electrical connection and installation work

in accordance with national and regional regulations.

DANGER Electrocution

The connection to the power supply must be in the form

of a permanent connection. Ensure the appliance can

be separated from the power supply by an isolator that

disconnects all poles with at least 3mm contact separa-

tion. This requirement can be met with contactors, circuit

breakers, fuses/MCBs, etc.

Note

The speciﬁed voltage must match the mains voltage. Ob-

serve the type plate.

Install cables with the following cross-sections in accordance with

the respective fuse rating:

MCB/fuse

rating

Assignment Cable cross-section

C 16 A Compressor 2.5 mm²

B 16 A

Electric emergency/

booster heater (BH)

2.5 mm²

1.5 mm² with only two live cores and

routing on a wall or in an electrical con-

duit on a wall.

B 16 A Control cable 1.5 mm²

The electrical data is provided in the "Speciﬁcation" chapter. For

the WPL10I, you require a J-Y (St) 2x2x0.8mm² electric BUS cable.

Material losses

Provide separate fuses/MCBs for the two power circuits,

i.e. for the compressor and the electricemergency/boost-

er heater circuits.

10. Installation

10.1 Transport

 Pay attention to the appliance's centre of gravity when trans-

porting the appliance.

- The centre of gravity is in the area where the compressor is

located.

- With the WPL10IK3, ensure that the control fascia is at the

top during transport.

- Lifting slings for handling the standard appliance can be

hooked in anywhere on the bottom of the frame.

 Protect the appliance against heavy impact during transport.

- If the appliance needs to be tilted during transport only do so

for a short time on one of its longitudinal sides.

- The longer the appliance is tilted, the greater the distribution

of refrigerant oil in the system.

 Wait approximately 30minutes before starting the appliance

after it has been tilted.

10.2 Siting

 Remove the packaging ﬁlm and the top and side EPS

padding.

D0000051813

1 Appliance foot

2 Sliding block

 Undo the four ﬁxing screws underneath the pallet.

 Remove the appliance feet from the pack. Fully turn the feet

onto the appliance, without removing the appliance from the

pallet.

 Take the appliance off the pallet and set it down on the pre-

pared base. If required, use the sliding blocks provided to

help you position the appliance.

 Observe minimum distances (see the "Preparations / Mini-

mum clearances" chapter).

 Level the appliance horizontally by adjusting the feet.

10.3 Heating water connection

The heating system to which the heat pump is connected must be

installed by a qualiﬁed contractor in accordance with the water

installation diagrams that are part of the technical guides.

In dual mode operation, return water from the second heat gen-

erator may ﬂow through the heat pump. The return water tem-

perature must not exceed 60°C.

 Thoroughly 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. We rec-

ommend installing our ﬁlter assembly in the heating return

(see chapter "Accessories").

 On the WPL10I, connect one ﬂexible pressure hose each to

the heating ﬂow and heating return connections to act as

an anti-vibration mount. The pressure hoses are part of the

standard delivery. Anti-vibration mounts are already ﬁtted to

the WPL10IK3.

 Ensure the correct connection of the heating ﬂow and return.

 Check for tightness.

 When sizing the heating circuit, observe the maximum avail-

able external pressure differential (see the "Speciﬁcation /

Data table" chapter).

 Provide thermal insulation in accordance with applicable

regulations.

www.stiebel-eltron.com WPL 10 | 9

INSTALLATION

Installation

10.4 Oxygen diffusion

Material losses

Avoid using open vented heating systems or steel pipe-

work in conjunction with underﬂoor heating systems with

plastic pipes that are permeable to oxygen.

In open vented heating systems or in underﬂoor heating systems

with permeable plastic pipes, oxygen diffusion can cause corro-

sion on steel components such as internal cylinders, steel heating

elements or steel pipes.

The products of corrosion, e.g. rusty sludge, can settle inside the

heat pump condenser and reduce its cross-section, resulting in a

lower output or in the high pressure switch triggering a shutdown.

10.5 Filling the heating system

Heating water quality

Carry out a ﬁll water analysis before the system is ﬁlled. This may,

for example, be requested by the relevant water supply utility.

Material losses

To avoid damage as a result of scaling, it may be neces-

sary to soften or desalinate the ﬁll water. Always observe

the ﬁll water limits speciﬁed in the "Speciﬁcation / Data

table" chapter.

 Recheck these limits 8 - 12 weeks after commission-

ing and as part of the annual system service.

Note

With a conductivity >1000μS/cm, desalination treatment

is recommended in order to avoid corrosion.

Note

Suitable appliances for water softening and desalinating,

as well as for charging and ﬂushing heating systems, can

be obtained from trade suppliers.

Note

If you treat the ﬁll water with inhibitors or additives, the

same limits as for desalination apply.

10.6 Venting the heating system

Vent the heating system thoroughly.

10.7 Safety temperature controller for underﬂoor

heating system

Material losses

In order to prevent excessively high ﬂow temperatures in

the underﬂoor heating system in the event of a fault, we

always recommend using a safety temperature controller

to limit the system temperature.

10.8 Buffer cylinders

10.8.1 Installation with buffer cylinder

A buffer cylinder is recommended to ensure a trouble-free heat

pump operation. The buffer cylinder (cylinder SBP) is not only

installed as an hydraulic separator for volume ﬂow in the heat

pump and heating circuits, but primarily as energy source for

defrosting the evaporator.

If a buffer cylinder is used, remove the jumper across terminals

X4/5 (pump) and X4/8 (HCP) when commissioning the WPL...IK.

Remove return sensor B2 connected to terminals X2/2(B2) and

X2/3(B2) from the sleeve in the heat pump return and insert it

into the buffer cylinder sensor well.

10.8.2 Installation without buffer cylinder

Material losses

For operation without a buffer cylinder, set parameter

BUFFER OPERATION in menu SETTINGS / HEATING /

STANDARD SETTING to OFF.

10 | WPL 10 www.stiebel-eltron.com

INSTALLATION

Installation

10.9 Flow rate, heating side

10.9.1 Minimum ﬂow rate for operation without a buffer

cylinder

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 and heating circuits in conjunction with area heating sys-

tems [underﬂoor heating systems, for example].

In an installation with several heating circuits, we recommend

using a low loss header.

The minimum ﬂow rate is set via the temperature differential of

the heating system.

Set the heating circuit pump so that the value is equal to or lower

than the maximum temperature differential.

The setting is made in heat pump operation alone. For this, the

following settings must be made ﬁrst:

 Temporarily remove the fuse from the electric emergency/

booster heater to isolate it from the power supply. Alterna-

tively, switch OFF the second heat generator.

 Operate the heat pump in heating mode.

Minimum ﬂow rate with single room control via FE7orFEK

Maximum temperature differential on the heating side with over-

ﬂow valve or single room control with remote control

-15 -10 -5 0 5 10 15 20 25 30

84_03_01_0156_

X Outside temperature [°C]

Y Maximum temperature differential [K]

In such cases, one or more heating circuits in the heating sys-

tem must remain open. The open heating circuit(s) should be

installed in the lead room (room in which the remote control is

installed, e.g. the living room). Single room control can then be

implemented with the remote control or indirectly by adapting

the heating curve.

 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 at the circulation pump when the temper-

ature differential between the ﬂow and return temperature

has stabilised.

Set the heating circuit pump so that the minimum ﬂow rate re-

quired to operate the system is safeguarded.

Note

Never adjust the ﬂow rate of the cylinder circuit pump.

The ﬂow rate of the cylinder circuit pump has been op-

timised at the factory.

 Compare the resulting temperature differential between the

ﬂow and return at the appliance with the diagram "Maximum

temperature differential on the heating side with overﬂow

valve or single room control with remote control".

 Set the heating circuit pump so that the maximum tempera-

ture differential is achieved or undershot.

10.9.2 Flow rate with low loss header or buffer cylinder

The ﬂow rate can be adjusted using the temperature differential

of the buffer circuit. In this case, the minimum ﬂow rate must not

be undershot.

Maximum temperature differential on the heating side with low

loss header or buffer cylinder

-15 -10 -5 0 5 10 15 20 25 30

84_03_01_0156_

X Outside temperature [°C]

Y Maximum temperature differential [K]

 Make the settings at the circulation pump when the temper-

ature differential between the ﬂow and return temperature

has stabilised.

 Compare the resulting temperature differential between the

ﬂow and return at the appliance with the diagram "Maximum

temperature differential on the heating side with low loss

header or buffer cylinder".

 Set the delivery head of the heating circuit pump to a level

that safeguards the heating ﬂow rate required to operate the

heat pump (see the "Speciﬁcation / Data table" chapter).

 If the appliance will be used for DHW heating, check the set-

ting of the delivery head in DHW mode.

 If necessary, adjust the delivery head to match the heating

circuit pump.

10.9.3 Using highly energy efﬁcient pumps [HE]

If you use a HE pump as the heating circuit pump, you will have to

adjust the minimum ﬂow rate using the temperature differential

of the heating system.

 Set the heating circuit pump to ∆p-constant.

 Set ∆p-constant to the value at which the maximum temper-

ature differential of the heating system is reached.

www.stiebel-eltron.com WPL 10 | 11

INSTALLATION

Installation

10.10 Condensate drain

At the factory, a hose for draining condensate is fitted

to the defrost pan, which terminates near the knock-out

in the bottom plate to the right of the refrigeration unit.

You can route the condensate hose from the appliance through

openings in the ﬂoor plate and frame, to the right or to the front.

D0000052105

 Ensure the condensate drain hose is not kinked.

 Route the hose with a continuous fall.

 Use a suitable condensate pump if there is insufﬁcient fall.

Observe the building characteristics.

 If using a condensate pump, ensure that it delivers at least

6 l/min. Set the heat pump approximately 100 mm higher if

condensate pump PK10 is used for draining the condensate.

Heating curve adjustment

Adjust the heating curve carefully, as the heat pump efﬁciency will

be reduced with an increasing ﬂow temperature. Heating curves

which are set too high, lead to the zone and thermostatic valves

closing, which may lead to the minimum ﬂow rate required for

the heat pump not being achieved.

Procedure for setting the correct heating curve:

Fully open the thermostatic valve(s) or zone valve(s) in the lead

room, e.g. in the living room or bathroom (remove the head of

thermostatic valves) and set the heating curve at different outside

temperatures (e.g. – 10 °C and + 10 °C), so that the required tem-

perature is achieved in the lead room. The thermostatic valve(s)

or zone valve(s) in the lead room should always be fully open (we

recommend that the heating circuit of the lead room is installed

without thermostatic or zone valves and that individual room con-

trol is implemented using a remote control unit).

Standard values to begin with:

Parameter Underﬂoor

heating

system

Radiator heating system

Heating curve 0.4 0.8

Control response

time

5 15

Room temperature 20 °C 20 °C

Adjust the heating curve as follows:

Increase the room temperature parameter, if the room temper-

ature in spring and autumn is too low (approx. 10 °C outside

temperature). Providing no remote control is installed, this will

lead to a parallel offset of the heating curve. Increase the heating

curve parameter, if the room temperature is not high enough

when outside temperatures are low, then adjust the zone valve

or thermostatic valve to the required temperature.

Never reduce the temperature in the entire building by closing all

zone or thermostatic valves, but by using the setback programs.

10.11 Second heat generator

For dual mode systems, always connect the heat pump into the

return of the second heat generator (e.g. oil boiler).

10.12 Removing the casing parts

The side panels, the front and back panels are hooked into the

heat pump frame and are secured at the centre (bottom) of each

panel respectively with one quick-acting screw. After removing

the quick-acting screw, the casing panels can be pushed up and

removed.

On the WPL10IK3, only the lower casing panels can be removed.

12 | WPL 10 www.stiebel-eltron.com

INSTALLATION

Power supply

11. Power supply

11.1 General

WARNING Electrocution

 Before working on the appliance, isolate it from

the power supply at the control panel.

Note

Please observe the heat pump manager operating and

installation instructions.

Connection work must only be carried out by a qualiﬁed electrical

contractor in accordance with these instructions.

Permission to connect the appliance may need to be obtained from

your local power supply utility.

 Observe the "Preparations / Electrical installation" chapter.

Note

The heating system needs to be ﬁlled before making the

electrical connection (see the "Heating water connection"

chapter).

11.2 Electrical connection WPL10I

The terminals are located inside the appliance control panel, be-

hind the front door.

D0000051814

1 Control panel

 Observe the information in the "Preparations / Electrical in-

stallation" chapter.

 Remove the control panel from the casing.

 Use appropriate cables in accordance with local regulations.

 Check the function of the strain relief ﬁttings.

 Connect the heating circuit pump to the heat pump manager

in accordance with the technical guides.

11.3 Electrical connection WPL10IK3

The terminals are located inside the appliance control panel, be-

hind the top door.

D0000052078

 Open the top door.

D0000051815

1 Control panel

 Observe the information in the "Preparations / Electrical in-

stallation" chapter.

 Use appropriate cables in accordance with local regulations.

 Check the function of the strain relief ﬁttings.

www.stiebel-eltron.com WPL 10 | 13

INSTALLATION

Power supply

D0000051816

X26 (earth)X2NX4PE

X2X4X3PE

WPL 10 I

WPL 10 IK 3

11.4 Connecting compressor and electric

emergency/booster heater

Material losses

The compressor must only rotate in one direction. When

the compressor starts and the fault NO POWER appears

in the WPM3i display, change the rotating ﬁeld by inter-

changing two phases.

Appliance

function

Effect of the electric emergency/booster heater

Mono energet-

ic operation

If the heat pump undershoots the dual mode point, the elec-

tric emergency/booster heater safeguards both the heating

operation and the delivery of high DHW temperatures.

Emergency

mode

Should the heat pump suffer a fault that prevents its contin-

ued operation, the heating output will be covered by the elec-

tric emergency/booster heater.

X3 Compressor (HP)

L1, L2, L3, N, PE

X3 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 N PE

5.6 kW L1 L2 N PE

5.8 kW L1 L3 N PE

6.2 kW L2 L3 N PE

8.8 kW L1 L2 L3 N PE

 Cover the mains terminal and seal it when all electric cables

have been connected.

14 | WPL 10 www.stiebel-eltron.com

INSTALLATION

Fitting casing components

11.5 Control voltage connection

X4 Control voltage (control outputs)

KOKP

MKP

Pump

M(A)

M(Z)

HKP

HS2

ZKP

Ext. ST

Collector circuit pump and N, PE

Mixer circuit pump and N, PE

Heating circuit 2 and N, PE

Mixer open

Mixer close

Heating circuit pump and N, PE

Heat generator 2 and N, PE

DHW circulation pump and N, PE

X4 Control voltage (control inputs)

L, N, PE Power supply

EVU Enable signal

Material losses

 Only connect energy efﬁcient circulation pumps ap-

proved by us.

If energy efﬁcient circulation pumps are used that have

not been approved by us, use a relay with a breaking ca-

pacity of at least 10A/250VAC or our WPM-RBS relay set.

11.6 Low voltage connection

X2 Low voltage

T (buffer) / T (HR) Buffer cylinder sensor / heating return sensor

T (cool) / TDHW Flow sensor for cooling / lower DHW sensor for

solar connection

T (COLL) Collector sensor for solar connection

0 - 10 V PWM output

T(DHW) DHW cylinder sensor and earth (X26)

T(2.WE) HS2 temperature sensor and earth (X26)

T(A) Outside temperature sensor and earth (X26)

T(MK) Mixer circuit temperature sensor and earth (X26)

Rem.Contr. 1 connection for FE7

Rem.Contr. 3 connection for FE7

H BUS High

L BUS low

⊥

BUS earth ⊥

+ BUS " + "

12. Fitting casing components

Sealing the appliance

Before ﬁtting the casing parts, seal the appliance by afﬁxing plas-

tic sheets. The plastic sheets are supplied with the casing parts.

26_03_01_1505

 Use fabric tape to afﬁx the sheets over the holes at the bot-

tom of the frame on the r.h. and l.h. sides. The fabric tape is

supplied with the “air hose” accessories.

26_03_01_1506

 Hang the side sheets with the pre-cut holes onto the hooks

on the appliance.

www.stiebel-eltron.com WPL 10 | 15

INSTALLATION

Fitting air hoses

 Remove the backing from the adhesive tape strips on the

frame and on the plastic sheets.

26_03_01_1507

 Secure the plastic sheets by pressing them onto the

appliance.

 Seal gaps around the hooks with fabric tape.

13. Fitting air hoses

Note

Air hoses guide the intake air to the appliance and route

the discharge air from the appliance outdoors. They are

highly ﬂexible, thermally insulated and self-extinguishing

in case of ﬁre.

13.1 WPL 10 I

The air hose can be extended by turning the hose spirals into

each other. There must be an overlap of approx.30 cm. The total

length of hoses on the air intake and discharge sides must not

exceed 8m.

 Never incorporate more than four 90° bends. The radius of

the bends must be at least 600mm, relative to the centre of

the hose.

 Cut to size using a sharp knife. The hose spirals can be cut

with wire cutters.

 Secure the air hose approx. every1m to prevent it sagging.

 Manipulate the ends of the air hoses to ﬁt the oval shape of

the connectors on the cover and the hose connection panels

or wall outlets.

26_03_01_1446

 Firstly, push the outer hose slightly upwards.

26_03_01_1447

 Push the inner hose halfway down the connector.

26_03_01_1448

 Seal the inner hose by afﬁxing it to the connector using the

fabric tape provided.

26_03_01_1449

 Place the sealing strip provided around the connector.

16 | WPL 10 www.stiebel-eltron.com

INSTALLATION

Commissioning

26_03_01_1450

 Pull the outer hose over the connector.

26_03_01_1452

 Secure the hose using the oval hose clip provided and seal it.

Insulating the brickwork

Ensure that no cold bridges form between the brickwork and the

hose connection panels or wall outlets. Cold bridges can result in

condensation forming in the brickwork.

 If necessary, ﬁt suitable insulation between the brickwork

and the hose connection panels or wall outlets.

13.2 WPL 10 IK 3

 Secure the fully assembled air hoses with the wing nuts (M5)

included in the pack to the heat pump (see Fig. "Dimensions

and connections WPL10IK3").

Use rawl plugs and screws suitable for the wall structure to attach

the wall connecting plates.

14. Commissioning

A qualiﬁed contractor must commission the appliance, make all

settings at the commissioning level of the heat pump manager,

and instruct the user.

Commission in accordance with these installation instructions

and the operating and installation instructions of the heat pump

manager. Our customer support can assist with commissioning,

which is a chargeable service.

Where this appliance is intended for commercial use, the rules of

the relevant Health & Safety at Work Act may be applied during

commissioning. For further details, check with your local super-

visory body; in Germany for example, this is theTÜV.

14.1 Checks before commissioning the heat pump

manager

Damage to the appliance and environment pollution

Observe the maximum system temperature in underﬂoor

heating systems.

 Check whether the heating system is charged to the correct

pressure and whether the quick-action air vent valve in the

heat pump is open.

 Check whether the outside temperature sensor and the re-

turn sensor are correctly placed and connected.

 Check whether further sensors are correctly positioned and

connected.

 Check whether the power supply is connected correctly.

14.2 Commissioning the heat pump manager

Commission the heat pump manager and make all settings in

accordance with the operating and installation instructions of the

heat pump manager.

14.3 Initial start-up

14.3.1 DIP switch (WP-Typ) on the IWS

(integral heat pump control unit)

 Open the control panel.

 The IWS is located on the r.h. side.

www.stiebel-eltron.com WPL 10 | 17

INSTALLATION

Shutdown

26_03_01_0921_

1 LEDs

2 DIP switch (WP-Typ)

3 Reset button

4 DIP switch (BA)

DIP switch (WP-Typ)

With the DIP switch (WP-Typ), you can set the IWS to suit the

relevant heat pump type.

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 external second heat generator

Damage to the appliance and environment pollution

In this case, do not connect the electric emergency/boost-

er heater.

If the appliance is operated in dual mode operation with an ex-

ternal second heat generator or as module with a further WPL,

set the DIP switch as follows:

26_03_01_1514

DIP switch (BA) on the IWS

The operating mode of the heat pump is selected with the DIP

switch (BA).

Damage to the appliance and environment pollution

The DIP switches must always be set to the OFF position.

The heat pump can only be operated when the switches

are in this position.

26_03_01_1436

 Check whether the DIP switch is set correctly.

15. Shutdown

Damage to the appliance and environment pollution

Never interrupt the heat pump power supply, even out-

side the heating season. Otherwise, system frost protec-

tion is not guaranteed.

The heat pump manager automatically switches the heat

pump to summer or winter mode.

15.1 Standby mode

To shut down the appliance, simply set the heat pump manager

to "Standby mode". This way the safety functions that protect the

system remain enabled, e.g. frost protection.

15.2 Power interruption

If the system is to be isolated from the power supply permanently,

please observe the following:

Material losses

If the heat pump and frost protection are completely

switched off, drain the system on the water side.

16. Appliance handover

Explain the function of the appliance to users and familiarise them

with its operation.

Note

Hand over these operating and installation instructions

to users for safe-keeping.

Always carefully observe all information in these instruc-

tions. They provide information on safety, operation, in-

stallation and maintenance of the appliance.

18 | WPL 10 www.stiebel-eltron.com

INSTALLATION

Troubleshooting

17. Troubleshooting

Note

Please observe the heat pump manager operating and

installation instructions.

Note

The following inspection instructions may only be carried

out by a qualiﬁed contractor.

If you cannot locate the fault using the heat pump manager, use

the controls on the IWS.

 Open the control panel.

 Read the following sections on troubleshooting and carry out

the instructions.

17.1 Controls on the IWS

The IWS helps you to troubleshoot if the fault cannot be identiﬁed

using the WPM.

26_03_01_0921_

1 LEDs

2 Reset button

Red LED (left)

Faults indicated by the LED:

- High pressure fault

- Low pressure fault

- Central fault

- Hardware fault on the IWS (see fault list, operating and in-

stallation instructions of the heat pump manager)

Fault Cause “ Remedy

The appliance stops and

restarts after the idle pe-

riod has expired. The red

LED flashes.

There is a heat pump

fault.

Check the fault message

on the WPM.

Find the solution in the

WPM instructions (fault

list). Reset the IWS.

Fault Cause “ Remedy

The appliance stops per-

manently. The red LED is

illuminated steadily.

Five faults have oc-

curred within two

hours of compressor

runtime.

Check the fault message

on the WPM. Find the

solution in the WPM in-

structions (fault list). Reset

the IWS.

Green LED (centre)

The LED ﬂashes during initialisation, and illuminates constantly

after the BUS address has been assigned successfully. Connection

to the WPM has been established.

Green LED (right)

No function.

17.1.1 Reset button

If the IWS was not initialised successfully, you can reset it with this

reset button. Observe the "Reinitialising IWS" chapter in the heat

pump manager operating and installation instructions.

17.2 Fan noise

The heat pump draws heat from the outdoor air. This causes the

outdoor air to cool down. At outside temperatures of 0°C to 8°C,

the air may be cooled to below freezing point. If under these

conditions precipitation occurs in the form of rain or fog, ice may

form on the air grille, the fan blades or the airways. If the fan

comes into contact with this ice, noise develops.

How to remedy rhythmic scratching or grinding noises:

 Check whether the condensate drain is clear of obstructions.

 Check whether the design output and temperature are set

correctly. Ice formation is particularly pronounced when

high heating output is called for at moderate outside

temperatures.

 Carry out a manual defrost, repeatedly if required, until the

fan runs free again.

 At outside temperatures above + 1°C, switch the appliance

off for around 1hour or switch it over to emergency mode.

After this, the ice should have melted.

 Check whether the appliance is installed in line with the in-

stallation conditions.

 If the noises occur frequently, notify customer support.

18. Maintenance

We recommend that you perform an annual inspection (to es-

tablish the current condition of the system), and carry out any

maintenance as required (to return the system into its original

condition).

www.stiebel-eltron.com WPL 10 | 19

INSTALLATION

Specication

19. Speciﬁcation

19.1 Dimensions and connections WPL10I

1100

22-40

855

237

120

143

421

235

280

380

965

760

g01

g02

e02

e01

b01

c11

D0000016747

WPL 10 I

b01 Entry electrical cables

c11 Safety assembly

e01 Heating flow Diameter mm 22

e02 Heating return Diameter mm 22

g01 Air intake Nominal diameter DN 315

g02 Air discharge Nominal diameter DN 315

20 | WPL 10 www.stiebel-eltron.com

INSTALLATION

Specication

19.2 Dimensions and connections WPL10IK3

760

≤800

1640

130

235

1365

22-40

1818

380

279

237

≥300

383

120

c11

g01

g02

e02

e01

b01

873

e22

D0000016751

WPL 10 IK 3

b01 Entry electrical cables

c11 Safety assembly

e01 Heating flow Diameter mm 22

e02 Heating return Diameter mm 22

e22 Cylinder flow Diameter mm 22

g01 Air intake Nominal diameter DN 315

g02 Air discharge Nominal diameter DN 315

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STIEBEL ELTRON WPL 10 I Operation Instruction

Brand: STIEBEL ELTRON

Model: WPL 10 I

Category: Oxygen Equipment

Type: Operation Instruction

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STIEBEL ELTRON WPL 10 I Operation Instruction

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