STIEBEL ELTRON WPL 15 IKS-2, WPL 25 IK-2, WPL 15 IS-2, WPL 25 I-2 Operation And Installation

OPERATION AND INSTALLAT ION

Air | water heat pump

» WPL 15 IKS-2 » WPL 25 IK-2

CONTENTS

SPECIAL INFORMATION

OPERATION

1. General information ��4

1.1 Safety instructions �� 4

1.2 Other symbols in this documentation �� 4

1.3 Units of measurement �� 4

1.4 Standardised output data �� 4

2. Safety �� 5

2.1 Intended use �� 5

2.2 General safety instructions �� 5

3. Appliance description ��5

3.1 Energy saving tip �� 6

4. Settings ��6

4.1 Controls �� 6

4.2 Essential facts in brief �� 7

4.3 Adjustments at control level 1 �� 8

4.4 Overview of control level 2�� 8

4.5 Adjustments at control level 2 �� 9

4.6 Remote control FE 7 �� 18

4.7 Remote control FEK �� 18

4.8 Internet Service Gateway (ISG) �� 18

5. Maintenance and care �� 19

6. Troubleshooting �� 19

6.1 Other problems �� 19

INSTALLATION

7. Safety �� 20

7.1 General safety instructions �� 20

7.2 Instructions, standards and regulations �� 20

8. Appliance description �� 20

8.1 Mode of operation �� 20

8.2 Standard delivery �� 20

9. Preparations �� 20

9.1 Internal unit �� 20

9.2 External unit �� 22

9.3 Refrigerant lines �� 23

9.4 Electrical installation�� 24

9.5 Buffer cylinder �� 24

10. Appliance installation �� 25

10.1 Internal unit �� 25

10.2 External unit �� 25

10.3 Condensate drain �� 27

10.4 Installing supply lines and supply cables �� 28

10.5 Installing refrigerant lines �� 28

10.6 Heating water connection �� 31

10.7 DHW connection �� 33

10.8 Operation with buffer cylinder �� 33

10.9 Fitting the push-ﬁt connectors �� 33

11. Power supply �� 34

11.1 General ��34

11.2 Electrical connection of internal unit �� 34

11.3 Electrical connection of external unit �� 37

11.4 Connection diagram WPL 15 IKS-2 ��38

11.5 Connection diagram WPL 25 IK-2 �� 39

11.6 Sensor installation �� 40

11.7 Remote control FE 7 �� 40

11.8 Remote control FEK ��40

11.9 Internet Service Gateway ISG �� 41

11.10 Safety temperature controller for underﬂoor heating system ��41

12. Commissioning �� 41

12.1 Checks before commissioning�� 41

12.2 Minimum ﬂow rate �� 42

12.3 Setting the ﬂow rate on the heating side �� 42

12.4 Operation and control �� 43

12.5 Decommissioning �� 43

12.6 Heat pump manager commissioning summary �� 44

12.7 WPMme commissioning report �� 53

13. Settings �� 54

13.1 Standard settings �� 54

13.2 Heating and DHW programs �� 54

13.3 Appliance handover �� 55

14. Shutting down �� 55

15. Troubleshooting �� 55

15.1 Fault display �� 55

15.2 Resetting the high limit safety cut-out �� 57

15.3 Fan noise �� 57

15.4 Fault tables ��58

16. Maintenance �� 60

16.1 DHW cylinders �� 60

16.2 Replacing the signal anodes�� 61

16.3 Safety valve drain on the internal unit �� 61

16.4 Maintenance work on the external unit �� 61

17. Speciﬁcation �� 62

17.1 Dimensions and connections �� 62

17.2 Internal unit wiring diagram WPL 15 IKS-2 �� 66

17.3 Internal unit wiring diagram WPL 25 IK-2��68

17.4 External unit wiring diagram WPL 15 IKS-2 and WPL 25 IK-2 �� 71

17.5 Performance diagram WPL 15 IKS-2 �� 72

17.6 Performance diagram WPL 25 IK-2 �� 73

17.7 Data table �� 74

GUARANTEE

ENVIRONMENT AND RECYCLING

2 | WPL 15 IKS | WPL 25 IK www.stiebel-eltron.com

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.

- In dual mode operation, return water from the second heat generator may ﬂow through the heat pump. Please note that the return water temperature may be a maximum of 65°C.

- Ensure that the refrigerant circuit is tested once a year for leaks, in accordance with EC DIRECTIVE 517/2014. The tightness test must be documented in the log.

DHW cylinders

- Regularly activate the safety valve to prevent it from becoming blocked e.g. by limescale deposits.

- Drain the DHW cylinder as described in the chapter „Installation/ Maintenance/ Draining the DHW cylinder“.

- Install a type-tested safety valve in the cold water supply line. For this bear in mind that, depending on the static pressure, you may also need a pressure reducing valve.

- The safety valve discharge aperture must remain open to the atmosphere.

- Install the safety valve discharge pipe with a constant fall to the discharge outlet.

- Size the discharge outlet so that water can drain off unimpeded when the safety valve is fully opened.

- The air outlet in the knurled cap of the quick-action air vent valve must not point towards the MFG PCB. Close the quick-action air vent valve again after venting.

- Maintenance work, such as checking the electrical safety, must only be carried out by a qualiﬁed contractor.

- We recommend a regular inspection (to establish the current condition of the system), and maintenance by a qualiﬁed contractor if required (to return the system to its original condition).

- Following isolation from the mains supply, parts of the appliance may remain live for up to 2 minutes since the capacitors still have to discharge into the inverter.

- 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.

www.stiebel-eltron.com WPL 15 IKS | WPL 25 IK | 3

OPERATION

General information

OPERATION

1. General information

The chapters „Special information“ and „Operation“ are intended for both users and qualiﬁed contractors.

The chapter „Installation“ is intended for heating 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 instructions

1.1.1 Structure of safety instructions

KEYWORD Type of risk

!

Here, possible consequences are listed that may result from failure to observe the safety instructions.

 Steps to prevent the risk are listed.

1.2 Other symbols in this documentation

Note

Notes are bordered by horizontal lines above and below the text. General information is identiﬁed by the symbol shown on the left.

 Read these texts carefully.

Symbol Meaning

!

 This symbol indicates that you have to do something. The ac-

tion you need to take is described step by step.

Material damage (appliance, consequential and environmental damage)

Appliance disposal

1.3 Units of measurement

Note

All measurements are given in mm unless stated otherwise.

1.1.2 Symbols, type of risk

Symbol Type of risk

!

1.1.3 Keywords

KEYWORD Meaning

DANGER Failure to observe this information will result in serious

WARNING Failure to observe this information may result in serious

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

Injury

Electrocution

Burns (burns, scalding)

injury or death.

ous or minor injury.

1.4 Standardised output data

Explanations to determine and interpret the speciﬁed standardised output data.

1.4.1 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. However, there is a deviation from this norm in the output data for air/water inverter heat pumps at source temperatures of > -7°C as this concerns partial load values. The associated percentage weighting in the partial load range can be found in EN14825 and EHPA quality label regulations.

Generally, the test conditions stated above 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 test conditions deﬁned in the ﬁrst paragraph 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 accordance with the test conditions deﬁned in the ﬁrst paragraph of this section.

4 | WPL 15 IKS | WPL 25 IK www.stiebel-eltron.com

OPERATION

Safety

2. Safety

2.1 Intended use

The appliance is used for heating rooms and domestic hot water.

Observe the application limits listed in the chapter „Speciﬁcation/ Data table“.

The appliance is intended for domestic use, i.e. it can be used safely by untrained persons. The appliance can also be used in a non-domestic environment, e.g. in a small business, as long as it is used in the same way.

Any other use beyond that described shall be deemed inappropriate. Observation of these instructions and of instructions for any accessories used is also part of the correct use of this appliance. Any changes or conversions to the appliance void any warranty.

2.2 General safety instructions

Observe the following safety instructions and regulations.

- Only qualiﬁed contractors should carry out the electrical work and installation of this appliance.

- The authorised contractor is responsible for adherence to all currently applicable instructions during installation and commissioning.

- Operate the appliance only when fully installed and with all safety equipment ﬁtted.

- Protect the appliance from dust and dirt ingress during building work.

- The DHW cylinder is at mains water pressure. If no diaphragm expansion vessel is installed, expansion water may drip from the safety valve during heat-up.

- Notify your contractor if water is still dripping from the safety valve after the heat-up process.

WARNING Burns There is a risk of scalding at outlet temperatures in excess of 43 °C.

DANGER Injury

!

The appliance may be used by children aged 8 and up and persons with reduced physical, sensory or mental capabilities or a lack of experience provided that they are supervised or they have been instructed on how to use the appliance safely and have understood the resulting risks.

WARNING Injury

!

 For safety reasons, only operate the appliance with

the casing closed.

3. Appliance description

The appliance comprises an internal unit (heat pump module) and an external unit (evaporator module).

These two units are connected by refrigerant lines.

The external unit is designed for external installation and extracts low grade heat from the ambient air.

The extracted energy together with the energy drawn by the variable speed compressor is transferred to the heating water inside the internal unit.

The heating water then transfers the heat to the heating system or to the DHW via a three-way valve. As a result, ﬂow temperatures of 65°C can be achieved.

The appliance is equipped with an electric emergency/booster heater. In mono mode operation, the electric emergency/booster heater is activated when the dual mode point can no longer be maintained, in order to safeguard heating operation and the provision of high DHW temperatures. In mono energetic mode, the electric emergency/booster heater is activated as a booster heater.

Mode of operation

The heat exchanger on the air side (evaporator) is ﬁtted in the external unit. It extracts heat from the outdoor air at temperatures ranging from +40°C to -20°C.

In the heat exchanger on the water side (condenser) the heating water is heated up to the ﬂow temperature using electric power (compressor).

At air temperatures below approx.+7°C, the humidity in the air precipitates as hoarfrost on the evaporator ﬁns. Any hoarfrost is automatically defrosted. Water created from defrosting collects in the condensate pan and drains off below the external unit.

Control unit

The system is regulated by an integral, weather-compensated return temperature control unit (WPMme). The return temperature control maintains DHW heating at the required temperature level.

The return temperature control is combined with inverter technology. Thanks to this control technology, the compressor output is matched to the outside temperature and the heat demand of the building.

This prevents the compressor from being subjected to frequent cycling, particularly in spring and autumn. Consequently, the average ﬂow temperature is lowered, leading to higher efﬁciency and seasonal performance factor.

The status of the signal anode is shown by a red signal indicator beneath the heat pump manager.

www.stiebel-eltron.com WPL 15 IKS | WPL 25 IK | 5

OPERATION

Settings

Appliance functions

- Fully automatic heating of heating water.

- Suitable for underﬂoor heating and radiator heating systems; preferentially for low temperature heating systems, as these achieve higher performance factors.

- Extraction of energy from outdoor air, even at outside temperatures as low as -20°C.

- Centralised control of the heating system and safety functions through the heat pump manager.

- Lower average ﬂow temperature and higher seasonal performance factor thanks to intelligent output control.

- Comprises all components and safety equipment required for operation.

- Compact space requirement due to compact design.

Heat pump manager functions

- System expansion through the FEK and FE7 remote controls.

- Input of the system and heat pump frost protection limits.

- Automatic pump kick control.

- Reset option.

- Stored fault list with precise fault code indication on the dis-

play, including date and time.

- Fast and precise fault diagnosis via system analyser, including

temperature scanning of heat pumps and system without additional equipment.

- Factory settings for time switch programs for all heating and

DHW circuits.

4. Settings

Operation is divided into three control levels. Control levels 1 and 2 are accessible to users and contractors alike. Control level 3 is reserved for contractors:

Control level 1 (control ﬂap closed)

This enables the adjustment of operating modes, such as standby mode, programmed operation, constant day or setback mode etc.

Control level 2 (control ﬂap open)

This enables system parameters, such as room temperatures, DHW temperatures, heating programs etc. to be adjusted.

Control level 3 (for contractors only)

This level is protected by a code and should only be used by a qualiﬁed contractor. Here, you can determine the speciﬁc details regarding the heat pump and the heating system.

4.1 Controls

4.1.1 Heat pump manager WPMme

ROOM T HC1

3.1 Energy saving tip

Heat pumps operate with particular economy and environmental responsibility when run at a maximum ﬂow temperature of 35°C.

- Low ﬂow temperatures can be achieved by using area heating systems (e.g. underﬂoor heating or wall heating systems).

- For radiator heating systems size radiators to a maximum ﬂow temperature of 45°C.

- If the DHW cylinder needs to be heated to 60°C once a day to ensure pasteurisation, activate parameter PASTEURISATION.

 If you have any questions about pasteurisation, please ask

your contractor.

Heizkurven

Zeit / Datum

Info Temperaturen

Ferien / Partyprog.

PRGPC Reset Auto

57

Heizprogramme

Warmwasserprog.

4

Inbetriebnahme

36

8

Raumtemp. 1

Raumtemp. 2

Warmwassertemp.

1 Rotary selector 2 Signal indicator, red (signal anode) 3 Rotary selector Reset / Auto 4 Appliance menu 5 Programming key 6 No function 7 Programming indicator 8 Optical interface RS 232

2

1

26�03�01�0073

6 | WPL 15 IKS | WPL 25 IK www.stiebel-eltron.com

OPERATION

Settings

4.1.2 System status display

5 6 7 8 9

1 Compressor 2 Buffer cylinder primary pump 3 Electric emergency/booster heater (DHW heating) 4 Electric emergency/booster heater (heating) 5 Mixer open 6 Mixer closed 7 Circulation pump, heating circuit 2 „mixer circuit“ 8 Circulation pump, heating circuit 1 „radiator circuit“ 9 DHW heating

ROOM T HC1

1 2

3 4

4.2 Essential facts in brief

Settings

All settings at the heat pump manager follow the same pattern:

Opening the control ﬂap switches the heat pump manager into programming mode. An arrow appears in the lower section of the display, above the menu item ROOM TEMPHC1.

 Turn the rotary selector to choose a different menu item.

Turn the rotary selector until the arrow is visible above the menu item you require.

 Press the programming key to adjust the values under the

selected menu item.

The values shown on the display can be adjusted when the programming indicator illuminates.

 Turn the rotary selector to adjust the displayed value.  Press the programming key again to save the selected values.

The new set value is saved when the programming indicator goes out.

If the programming indicator above the programming key does not go out after saving the value, this means that there are further values that can be set under this menu item.

 Press the programming key to adjust the displayed values.  You may only terminate the programming process once the

programming indicator has gone out.

Note

During commissioning, a system check will be implemented, e.g. all sensors that are currently connected are displayed upon request. Sensors not connected before the system went 'live' are not registered by the heat pump manager and are therefore not displayed. The indicator symbol skips that menu item.

26�03�01�1367

Display including all display elements

2 9876531

16

1 Heating times for central heating and DHW (black) 2 14-digit plain text display 3 Day mode for heating circuit 1 4 Compressor running 5 Silent mode in operation 6 Switching time pairs for heating and DHW mode or with si-

lent mode: Silent mode 1 or 2 7 Emergency/booster heater in operation 8 Defrosting 9 Setback mode for heating circuit 1 10 Electric emergency/booster heater 11 DHW mode 12 Constant setback mode 13 Constant day mode 14 Automatic mode 15 Standby mode 16 Fault message (ﬂashing)

4

15

13 12 11

14

10

D0000057133

Terminating the programming process

 Close the control ﬂap to terminate individual menu item

entry and saving processes.

 If you want to make further changes, turn the rotary selector

until the display shows BACK.

 Press the programming key to return to the previous level.

Closing the control ﬂap while the programming indicator is illuminated returns the heat pump manager to its original state. The adjusted value will then not be saved.

www.stiebel-eltron.com WPL 15 IKS | WPL 25 IK | 7

OPERATION

!

Settings

4.3 Adjustments at control level 1

 Keeping the control ﬂap closed, turn the rotary selector to

the operating mode you wish to adjust.

Standby mode

Frost protection is activated for heating and DHW mode. When the ﬂap is closed, FROST PROTECT is displayed. The set DHW value is ﬁxed at 10°C, the set heating ﬂow value is calculated based on a set room value of 5°C. Application: During prolonged periods of absence, e.g. holidays.

Automatic mode

Heating in line with the time switch program (applies to heating circuits1 and2). Changeover between day temperature and setback temperature. DHW heating in line with the time switch program; changeover between day temperature and setback temperature. With this operating mode, an additional symbol (sun or moon) indicates in the display, whether heating circuit1 is currently in day or in setback mode. The remote control is only active in this operating mode. Application: When DHW and central heating are required.

Constant day mode

The heating circuit (HC) is constantly held at the day temperature (HC1 and HC2). DHW heating according to time switch program. Application: In low energy houses, if no setback mode intended.

Constant setback mode

The heating circuit is constantly held at the setback temperature (HC1 and HC2). DHW heating according to time switch program. Application: During weekends away.

Silent mode

Reduced noise mode Silent mode is enabled. The associated time programs determine activation of the fan or compressor throttle.

Note

Silent mode has an effect on the heating output and efﬁciency of the heat pump. When silent mode 2 is active, higher electricity bills result.

Silent mode 1

The fan and / or compressor run with reduced output.

Silent mode 2

Compressor and fan are stopped. Heat generator2 takes over heating.

4.4 Overview of control level 2

Control level 2 is accessed as follows:

 Open the control ﬂap.  Select the required parameter with the rotary selector. Turn

the rotary selector until the arrow is visible above the menu item you require.

The selected menu item is displayed as plain text. The arrow indicates the menu position within the control level.

You can now adjust the values for the following menu items (see following chapters).

ROOM TEMP HC 1

Here you can select the set room temperature for day and setback mode for heating circuit1.

DHW mode

DHW heating in line with the time switch program; changeover between day temperature and setback temperature. Frost protection is enabled for heating mode. Application: The heating season has ended; only DHW should be generated (summer mode).

Electric emergency/booster heater

This setting activates the electric emergency/booster heater. In this operating mode, the electric emergency/ booster heater provides DHW and room heating, irrespective of the dual mode changeover point.

Fault message (ﬂashing)

This symbol indicates faults in the heat pump system.

 Inform your contractor immediately.

ROOM TEMP HC 2

Here you can select the set room temperature for day and setback mode for heating circuit2. Room T HC2 will only be displayed if the mixer ﬂow sensor for heating circuit2 has been connected.

Note

The actual room temperature can also be scanned here, provided the FE7 remote control has been connected and allocated to HC1 or HC2.

DHW TEMP

Here you can assign a set day and night value for the temperature in the DHW cylinder.

TIME / DATE

Here you can adjust the time and summer time. At the factory, summer time is set to begin on 25 March and to end on 25 October.

HOLIDAY/PARTY

You can indicate the length of your holiday using the HOLIDAY menu item (start date, end date). The heat pump system will operate in setback mode for the selected period. Frost protection for the DHW cylinder is active.

8 | WPL 15 IKS | WPL 25 IK www.stiebel-eltron.com

OPERATION

Settings

Under the PARTY menu item, you can extend the day mode by a few hours.

TEMPERATURES

Here you can check the heat pump system sensor temperatures, comparing set with actual values, check the heating curve gap etc.

HEATING CURVES

Here you can select a heating curve each for heating circuit1 and heating circuit2. Please note that the room temperature will only remain constant irrespective of the outside temperature if the correct heating curve has been selected for the relevant type of building. Selecting the correct heating curve is therefore vitally important.

HEATING PROG

Here you can adjust heating programs associated with heating circuits 1 and 2 (see chapter „Settings / Heating programs“).

DHW PROGRAM

Here you select the times when the appliance will control DHW heating using the set day value. At all other times, the appliance controls DHW heating using the set night value (setback mode). See chapter „Settings / DHW programs“).

4.5.1 Room temperature, heating circuit 1

With menu item ROOM T HC1, you can select the set room temperature for day and setback mode for heating circuit1. Changing these parameters results in a parallel shift of the heating curve.

The actual room temperature can also be scanned, as soon as the FE7 remote control has been connected and allocated to heating circuit 1.

ROOM T HC1

SET ROOM T DAY

COMMISSIONING

Note

The commissioning level (control level 3) may only be altered by your qualiﬁed contractor.

Here the settings of control level2 and the system-speciﬁc parameters need to be determined. Your heating contractor or our service department can set the parameters at control level 3, which is protected by code.

All parameters must be checked by your contractor or our service department. All selected values should be entered into the relevant column (system value) in the commissioning report.

4.5 Adjustments at control level 2

You can change the values under individual menu items, if required, by using the programming key and the rotary selector.

 Follow the instructions in the following diagrams which illus-

trate the process step by step.

Note that the values can only be adjusted when the programming indicator is illuminated.

 Press the programming key again to save the altered set

values.

The values are saved when the programming indicator goes out.

If the programming indicator does not go out after saving the value, this means that there are further values that can be set under this menu item.

SET ROOM T NGT

ACTUAL ROOM T

BACK

ROOM T HC1

www.stiebel-eltron.com WPL 15 IKS | WPL 25 IK | 9

OPERATION

Settings

4.5.2 Room temperature, heating circuit 2

With menu item ROOM T HC2, you can select the set room temperature for day and setback mode for heating circuit2. ROOM T HC2 will only be displayed if the mixer ﬂow sensor is connected.

The actual room temperature can also be scanned, as soon as the FE7 or FEK remote control has been connected and allocated to heating circuit2.

ROOM T HC2

SET ROOM T DAY

4.5.3 DHW temperature

Under menu item DHW TEMP, you can assign a set day and night value for the temperature in the DHW cylinder.

DHW TEMP

SET DHW T DAY

SET HW T NGT

SET ROOM T NGT

ACTUAL ROOM T

BACK

ROOM T HC2

SET HW T NGT

ACTUAL DHW T

BACK

DHW TEMP

10 | WPL 15 IKS | WPL 25 IK www.stiebel-eltron.com

OPERATION

Settings

4.5.4 Time and date

You can adjust the time and summer time with the TIME/DATE menu item.

At the factory, summer time is set to begin on 25 March and to end on 25 October.

TIME/DATE

SET CLOCK

TIME

4.5.5 Holiday and party program

In holiday mode, the heat pump system runs in setback mode and frost protection for DHW heating is enabled. HOLIDAY MODE is displayed when the ﬂap is closed.

For both the start and end of the holiday, enter the year, month and day. The start time is 0:00 h on the ﬁrst day of the holiday. The end time is 24:00 h on the day the holiday ends. After the holiday period has expired, the heat pump system switches back to the previous heating and DHW program.

In party mode, you can extend the day mode for central heating by a few hours. This is displayed with the ﬂap closed.

HOL PARTY

HOLIDAY

YEAR START

YEAR

MONTH

D AY

SET CLOCK

BACK

MONTH START

DAY START

YEAR END

TIME/DATE

www.stiebel-eltron.com WPL 15 IKS | WPL 25 IK | 11

OPERATION

Settings

MONTH END

DAY END

HOLIDAY

BACK

HOL PARTY

4.5.6 Temperatures

Under menu item TEMPERATURES, you can read off values of the heat pump and heat pump system.

TEMPERATURES

OUTSIDE

BACK

TEMPERATURES

Note

Please note that actual and set values can only be displayed if the appropriate sensors are connected.

Example:

Amount of compressor heat generated in heating mode since 0:00 h today in kWh.

12 | WPL 15 IKS | WPL 25 IK www.stiebel-eltron.com

OPERATION

Settings

TEMPERATURES Meaning

OUTSIDE Outside temperature

ACT ROOM T FE7 Actual room temperature for heating circuit 1 (HC1) or heating circuit 2 (HC2)

SET ROOM T FE7 Set room temperature for heating circuit 1 or heating circuit 2

REL HUMIDITY Relative humidity (will only be displayed if the FEK remote control is connected)

DEW POINT TEMP Dew point temperature (will only be displayed if the FEK remote control is connected)

ACTUAL DHW T Actual DHW temperature

SET DHW TEMP Set DHW temperature

ACTUAL RTRN T Actual heat pump return temperature for heating circuit 1

ACT HP FLOW T Actual heat pump flow temperature

ACT NGT FLOW T Flow temperature of electric emergency/booster heater

HTG CIRC ACT T Actual heating circuit temperature for heating circuit 1

HTG CIRC SET T Set heating circuit temperature for heating circuit 1 (HC1). Fixed temperature is displayed with set value control.

ACTUAL MIXER T Actual mixer flow temperature for heating circuit 2

SET MIXER TEMP Set mixer flow temperature for heating circuit 2

ACT BUFFER T Actual buffer temperature

FIXED FLOW T Set fixed temperature for heating circuit 1

SET BUFFER T Set buffer temperature (Highest set value of heating circuits H1 and H2. Fixed temperature will be displayed for fixed temperature

DUAL-MODE HTG Dual-mode point - central heating

DUAL-MODE DHW Dual-mode point - DHW

SYST FROST PRO System frost protection temperature

HEATING PRES HEAT ING PRE S

ACT VOLUME Current flow rate [l/min]

MAX VOLUME Flow rate for monitoring the defrost process [l/min]

STATUS HP 1 Status signal for "HP operation" and "HP fault"

STATUS HP 2 Status signal for "HP compressor�ON" and "defrost mode"

ST HP OPERATN Heat pump operation ON/OFF

ST HP COMP Compressor ON/OFF

ST HP FAULT Refrigerant circuit fault ON/OFF (ON= fault, OFF = no fault)

ST HP DEFROST Defrost mode ON/OFF

OUTPUT HP Controller output signal for heat pump output control

INT PUMP RATE Circulation pump output

HEAT AMOU DAY Amount of compressor heat generated in heating mode since 0:00 h today.

(will only be displayed if the FE7 remote control is connected)

control.)

TTL HEAT AMOU Total amount of compressor heat generated in heating mode.

HEAT AMOU DAY Amount of compressor heat generated in DHW mode since 0:00 h today.

TTL HEAT AMOU Total amount of compressor heat generated in DHW mode.

TTL HEAT AMOU Total amount of heat generated by the electric booster heater in heating mode.

TTL HEAT AMOU Total amount of heat generated by electric reheating in DHW mode.

www.stiebel-eltron.com WPL 15 IKS | WPL 25 IK | 13

OPERATION

Settings

HEATING CURVES

Under HEATING CURVES, you can adjust the respective heating curves for heating circuits1 and2. It is very important that the correct heating curve is selected to ensure a constant room temperature.

Note

Your contractor will have set up a building and system-speciﬁc optimum heating curve for every heating circuit. For heating circuit 1 this heating curve relates to the heat pump return temperature, for heating circuit 2 it relates to the mixer ﬂow temperature.

When the heating curve is displayed on the heat pump manager, the calculated set return or ﬂow temperature, subject to the outside temperature and the set room temperature, will be shown at the top of the display.

As soon as a temperature has been preselected via the ﬁxed temperature parameter at control level 3, heating curve1 will be hidden. If this is the case the display will show FIXED FLOW T with the relevant temperature.

Adjusting the heating curve

1 32

HTG CURVE

4

1 32

1 Relative to an outside temperature of +20°C 2 Relative to an outside temperature of 0°C 3 Relative to an outside temperature of -20°C 4 Day mode 5 Heating circuit1 6 Setback mode

5

6

26�03�01�1068

BACK

HTG CURVE

14 | WPL 15 IKS | WPL 25 IK www.stiebel-eltron.com

OPERATION

Settings

Heating curve diagram

One heating curve each can be adjusted for heating circuit1 and heating circuit2.

At the factory, heating curve 0.6 is set for heating circuit1 and heating curve 0.2 for heating circuit2.

These heating curves relate to a set room temperature of 20°C.

-14

-16

-18

2,53

2

1,5

1,2

1

0,8 0,6 0,4 0,2

-20

100

80

60

40

20

2018161412

86420

10

-2-4-6

-8

-10

-12

Y Heating circuit 1, heat pump return temperature [°C] Heating circuit 2, heat pump ﬂow temperature [°C] X Outside temperature [°C]

Adjusting the programmed changeover between day mode and setback mode

The following ﬁgure shows a standard heating curve with a slope of 0.8, relative to a set room temperature for day mode of 20°C. The lower curve represents the setback curve. For this, the set room temperature for setback mode of 15°C is used. As a result the heating curve shifts in parallel.

Adapting a heating curve

Example:

During spring and autumn, it can occur that the temperature in a building is too low at an outside temperature between 5°C and 15°C, despite open radiator valves, but is OK at outside temperatures of ≤ 0 °C. This problem can be remedied with a parallel shift and a simultaneous reduction of the heating curve.

Initially, the heating curve was set to 1.0, relative to a set room temperature of 20 °C. The dotted line indicates the modiﬁed heating curve at 0.83 and a modiﬁed set room temperature at 23.2°C.

70

60

50

40

30

20

26�03�01�1300�

2018161412

86420

10

-2-4-6

-8

-10

-12

-14

Y Return/ﬂow temperature [°C] X Outside temperature [°C]

-16

-18

-20

26�03�01�1302�

70

60

50

40

30

20

2018161412

86420

10

Y Return/ﬂow temperature [°C] X Outside temperature [°C] 1 Day mode 2 Setback mode

-2-4-6

1

2

-8

-10

-12

-14

-16

-18

-20

26�03�01�1301�

www.stiebel-eltron.com WPL 15 IKS | WPL 25 IK | 15

OPERATION

Settings

4.5.7 HEATING PROG

The HEATING PROG menu item enables you to determine when and how often the appliance heats to the set day values for heating circuit1 and heating circuit2. At all other times, the appliance heats in setback mode. You will have already selected the set values under parameter ROOM TEMP HC1/2.

In silent mode 1 you can programme additional times within the set periods during which you can reduce the compressor output by up to 50% via the settings. The fan speed is automatically adjusted.

In silent mode 2 the heat pump is switched off for the entire period selected here and heating is solely carried out by the electrical emergency/booster heater.

You can adjust your heating system as follows:

- For each individual day of the week (Monday – Sunday)

- Monday to Friday (Mo – Fr)

- Saturday and Sunday (Sa – Su)

- The whole week (Mo – Su)

You can set three switching time pairs (I, II, III) for each of these options.

Example:

For heating circuit 1, Monday to Friday, you would like your heating system to provide heat twice a day, i.e. from 05:30 h until 08:30 h and from 14:00 h until 22:00 h. For the weekend, your heating system should provide heat from 08:30 h until 21:00 h.

HEATING START

HEATING STOP

HEATING START

SAT-SUN

HEATING START

HTG PROG

HEATING CIRC 1

MON-FRI

HEATING START

HEATING STOP

HEATING START

SAT-SUN

BACK

16 | WPL 15 IKS | WPL 25 IK www.stiebel-eltron.com

OPERATION

Settings

BACK

HTG PROG

4.5.8 DHW programs

The DHW PROGRAM menu item enables you to adjust the times for the day and night temperatures for DHW heating.

You can adjust your DHW heating as follows:

- For each individual day of the week (Monday – Sunday)

- Monday to Friday (Mo – Fr)

- Saturday and Sunday (Sa – Su)

- The whole week (Mo – Su)

You can set three switching time pairs (I, II, III) for each of these options.

Exception: If you want to heat DHW from 22:00 h until 06:00 h the following day you will need two switching time pairs.

Example:

You would like to heat DHW twice daily, i.e. from 22:00 h until 06:00 h the following day, and then from 08:00 h until 09:00 h.

As the day begins at 00:00 h; you have to begin programming at 00:00 h also for this example.

- The ﬁrst switching time pair runs from 00:00 h until 06:00 h.

- The second switching time pair runs from 08:00 h until 09:00h.

- The third switching time pair runs from 22:00 h until 24:00 h.

DHW START

DHW STOP

DHW START

DHW STOP

DHW START

DHW STOP

DHW PROGRAM

MON-SUN

www.stiebel-eltron.com WPL 15 IKS | WPL 25 IK | 17

MON-SUN

BACK

DHW PROGRAM

OPERATION

Settings

4.6 Remote control FE 7

With the FE 7 remote control, the following options are available:

- Changing the set room temperature for heating, for heating circuit1 or2, by ±5°C.

- Changing the operating mode.

The FE 7 remote control features the following controls:

- Rotary selector for changing the set room temperature

- Rotary selector with the following positions

-

Automatic mode

-

Constant setback mode

-

Constant day mode

Note

The remote control is only active in the automatic mode of the heat pump manager.

4.7 Remote control FEK

Note

The heating curve, room temperature and heating program parameters are not shown at the WPMme heat pump manager if the FEK is pre-selected for a speciﬁc heating circuit.

4.8 Internet Service Gateway (ISG)

PIC00000609

The Internet Service Gateway (ISG) is an Ethernet gateway in a wall mounting enclosure and is connected into the LAN (local area network).

It enables the convenient operation, adjustment and checking of heat pump system data via the browser of a computer, laptop or tablet in the local home network.

If required by the customer, appliance data can be automatically transmitted to the appliance manufacturer‘s Servicewelt portal via the internet.

Via services, you can access additional options such as system operation on the go with a smartphone as well as remote setting of parameters and remote diagnosis, etc.

You can ﬁnd the current services on our homepage.

PIC00001002

PIC00000704

With the FEK remote control, the following options are available:

- Changing the set room temperature for heating, for heating circuit1 or2, by ±5°C.

- Changing the operating mode.

The FEK offers the following controls:

- Rotary selector for changing the set room temperature

- „Away“ button

- „Info“ button

- Key to select the following operating modes:

-

Standby mode

-

Automatic mode

-

Constant day mode

-

Constant setback mode

18 | WPL 15 IKS | WPL 25 IK www.stiebel-eltron.com

OPERATION

Maintenance and care

5. Maintenance and care

Material damage

!

Maintenance work, such as checking the electrical safety, must only be carried out by a qualiﬁed contractor.

 A damp cloth is sufﬁcient for cleaning all plastic and sheet

metal parts. Never use abrasive or corrosive cleaning agents.

 Protect the appliance from dust and dirt ingress during buil-

ding work.

 Have the electrical safety of the appliance and the functi-

on of the safety assembly regularly checked by a qualiﬁed contractor.

 Check the condensate drain monthly (visual inspection). Re-

move contamination and blockages immediately (see chapter “Maintenance/ Maintenance work on the external unit“).

1.

2.

6. Troubleshooting

Fault Cause Remedy

There is no hot water or the heating system stays cold.

Water is leaking from the appliance.

Condensate is collecting on the outside of the appliance.

Note

Even when the condensate is draining away correctly, expect water to drip from the appliance onto the ﬂoor.

6.1 Other problems

If you cannot remedy the fault, notify your heating contractor. To facilitate and speed up your enquiry, please provide the serial number from the type plate. The type plate is located at the front top, on the right or left hand side of the casing.

Sample type plate

There is no voltage at the appliance.

The condensate drain may be blocked.

The heat pump is drawing heat from the outdoor air to heat the building. This can cause the humidity in the outdoor air to accumulate as dew or frost on the cooled heat pump casing. This is not a defect.

Check the fuses/MCBs in your fuse box. Replace the fuses/reset the MCBs if required. Notify your contractor if the fuses/MCBs blow/trip again.

Clean the condensate drain as described in chapter „Maintenance and care“.

1

1 Inspection port

We recommend a regular inspection (to establish the current condition of the system), and maintenance by a qualiﬁed contractor if required (to return the system to its original condition).

D0000056511

Montageanweisung beachten! Dichtheit geprüft!

1 Number on the type plate

Made in Germany

*xxxxxxxxxxxxxxxxxx*

1

26�03�01�1736

www.stiebel-eltron.com WPL 15 IKS | WPL 25 IK | 19

INSTALLATION

Safety

INSTALLATION

7. Safety

Only a qualiﬁed contractor should carry out installation, commissioning, maintenance and repair of the appliance.

7.1 General safety instructions

We guarantee trouble-free function and operational reliability only if the 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

8.1 Mode of operation

The air, which acts as a heat source, enters the external unit. There, heat is extracted from the outdoor air, so that the air exits the external unit at a lower temperature.

The energy made usable by the heat pump is transferred to the heating water inside the internal unit.

The heating water then transfers its energy to the heating circuit. In addition, the energy of the heating water can also be used to heat domestic hot water.

The heat from the heating water is transferred to the domestic hot water by means of a 3-way diverter valve and a heat exchanger.

If the temperature falls below the dual mode point (for example,

-5°C), the electric emergency/booster heater (DHC) starts up. This occurs when the heat demand exceeds the heating output of the heating system. The electric emergency/booster heater then covers the residual heat demand.

The dual mode point can be adjusted by the contractor in the heat pump manager, under the menu item START UP.

8.2 Standard delivery

8.2.1 Standard delivery, internal unit

Delivered with the appliance:

- 1 outside temperature sensor AFS2

- 4 sliding blocks for the appliance feet

- 4 appliance feet

- 2 ﬂexible pressure hoses

- 2 straight push-ﬁt connectors

- Condensate drain hose

- 4 ﬁxing brackets

8.2.2 Standard delivery, external unit

Delivered with the appliance:

- 4 female soldering connections

8.2.3 Required accessories

- Type-tested safety assembly Never exceed the operating pressure of 1 MPa.

8.2.4 Further accessories

Also available are refrigerant lines, a corded remote control, immersion and contact sensors as well as a wall mounting panel with ribbon heater for installing the external unit on a wall.

9. Preparations

9.1 Internal unit

Note

The internal unit is designed for internal installation, except in wet areas.

Do not position the internal unit underneath or next to bedrooms.

Insulate pipe outlets through walls and ceilings against structure-borne noise transmission.

The room in which the internal unit is to be installed must meet the following conditions:

- No risk from frost.

- The room must not be subject to a risk of explosions arising from dust, gases or vapours.

- The room temperature must not exceed 25°C.

- When installing the internal unit in a boiler room together with other heating equipment, ensure that the operation of other heating equipment will not be impaired.

- The volume of the installation room should be at least

13.8m³.

- Load-bearing ﬂoor (for the weight of the internal unit, see chapter „Speciﬁcation / Data table“).

- Make provisions for quiet heat pump operation on ﬂoating screeds.

 Isolate the installation surface.

20 | WPL 15 IKS | WPL 25 IK www.stiebel-eltron.com

INSTALLATION

Preparations

1 2 3 54

Sound attenuation 45dB(A)

Sound attenuation of 45 dB(A) is achieved through a lightweight wall of a timber frame construction with full insulation. The cross-section of the timber supports should be 60x60mm. The wall must have plasterboard panelling on both sides, with

12.5mm on one side and 10mm on the opposite side.

1 Concrete base 2 Impact sound insulation 3 Floating screed 4 Floor covering 5 Recess

9.1.1 Sound insulation for rooms adjacent to the installation room

When the appliance is in operation, sound emissions can occur which may be a nuisance in adjacent rooms, especially if these are living rooms or bedrooms. To prevent noise pollution, sound attenuation measures are necessary, e.g. sound attenuation of a higher standard for the internal wall. Pipe ﬁxings and wall outlets must have anti-vibration insulation.

For the wall between the installation room and the living space, we recommend a wall structure that ensures the following level of sound attenuation:

- 45dB(A) for adjacent living rooms and bedrooms

- 40dB(A) for other rooms

Doors should be of sound safety category SK3.

If the appliance backs onto an adjacent room, we recommend the following level of sound attenuation:

- 55dB(A) for adjacent living rooms and bedrooms

- 50dB(A) for other rooms

A passage to the neighbouring room is not recommended.

The ﬂoor between the installation room and living room or bedroom must have carefully applied anti-vibration separation. Ensure that no pipes are routed on or in the wall.

1

26�03�01�1466

1 Timber supports 60 x 60mm 2 Gypsum ﬁbre board 12.5mm 3 Gypsum ﬁbre board 10 mm

Sound attenuation 55dB(A)

Sound attenuation of 55dB(A) is achieved through a lightweight twin wall of a timber frame construction with full insulation and 30mm parting line. The cross-section of the timber supports should be 60x60mm. The wall must have 12.5mm plasterboard panelling on both sides.

2

1

1 Timber supports 60 x 60mm 2 Parting line 30mm 3 Gypsum ﬁbre board 12.5mm

2

3

2

D0000047127

3

D0000047126

Hinweis

The appliance can seem loud if operated in an unﬁnished building without doors. This is because the ﬁxtures and ﬁttings are not yet in place which will provide sound attenuation; once the building is occupied this should no longer occur.

www.stiebel-eltron.com WPL 15 IKS | WPL 25 IK | 21

INSTALLATION

Preparations

9.1.2 Minimum clearances

≥500

≥300

≥150

≥1500

≥500

9.2.1 Sound emissions

The appliance is louder on the air intake and air discharge sides than on the two enclosed sides. Observe the following information when selecting the installation location.

Note

For details regarding the sound power level, see chapter "Speciﬁcation / Data table".

- Lawn areas and shrubs help reduce the spread of noise.

- Sound propagation can also be reduced by installing closely spaced palisade fencing around the appliance.

 Ensure that the air intake direction is the same as the main

wind direction. Air should not be drawn in against the wind.

 Ensure that the air intake and air discharge are never di-

rected towards noise-sensitive rooms of the house, e.g. bedrooms, or neighbouring houses.

 Avoid installation on large, echoing ﬂoor areas, e.g. tiled

ﬂoors.

 Avoid installation between reﬂective building walls. Reﬂec-

ting building walls can increase the sound level.

Minimum clearances

 Maintain the minimum clearances to ensure trouble-free

operation of the appliance and facilitate maintenance work.

9.2 External unit

The appliance is designed for siting in front of a wall. Observe the minimum clearances. If the appliance is installed in an open space or on a roof, protect the air intake side by erecting a wall to shield it against the wind.

D0000018813

 Do not install the appliance in a recess. Two sides of the ap-

pliance must be exposed.

≥800

≥250

D0000043290D0000043059

≥500

91�00�00�0036

≥2000

The substrate at the installation site must be horizontal, level, solid and permanent.

 Maintain the minimum clearances to ensure trouble-free

operation of the appliance and facilitate maintenance work.

22 | WPL 15 IKS | WPL 25 IK www.stiebel-eltron.com

D0000018802

INSTALLATION

Preparations

Material damage

!

Please note that the outdoor air must be able to ﬂow unimpeded into the appliance, and the exhaust air must be able to be expelled without obstruction. If the air intake and discharge of the appliance are obstructed by surrounding objects, this may cause a thermal short-circuit.

 Ensure that the air intake direction is the same as the main

wind direction. Air should not be drawn in against the wind.

 Ensure that the appliance is not surrounded by any objects

such as buildings, walls or fences. If necessary, maintain a greater clearance to the surrounding objects.

 Observe chapter „Sound emissions“.

Material damage

!

The air ﬂow rate through the appliance must not fall below the minimum level. If the air ﬂow rate falls below the minimum level, trouble-free operation of the appliance is not guaranteed.

 Ensure that the minimum air ﬂow rate is maintained. Obser-

ve the details in chapter „Speciﬁcation / Data table“.

 If necessary, maintain a greater clearance to the surrounding

objects.

If the air discharge side of the appliance faces a wall of the house, condensate may form on this wall from the cool air at the air discharge.

 Therefore avoid routing refrigerant lines through living areas

and bedrooms.

 As much as possible, route refrigerant lines outside the buil-

ding wall.

Install both the internal and external unit in such a way that the maximum lengths and heights of the refrigerant lines are not exceeded.

 Observe the maximum refrigerant line length and the maxi-

mum height offset.

Maximum refrigerant line length 25 m Minimum refrigerant line length 2 m

Maximum height offset

Note

If the air discharge side faces house walls, maintain the minimum speciﬁed clearance between the appliance and the building.

9.3 Refrigerant lines

Material damage

!

Prevent dirt and moisture from penetrating the refrigerant circuit. For this purpose, install the refrigerant lines just before the system is commissioned.

 Keep the refrigerant lines closed until commissio-

ning.

 Take appropriate measures to prevent damp outdoor

air from penetrating refrigerant lines (e.g. by ﬁlling with dry air/nitrogen and sealing with a plug).

 Point the pipe ends downwards to prevent water or

dirt entering.

 Cut the pipes using suitable tools without creating

any swarf or burrs. Prevent the ingress of swarf into

the pipes. Where possible, carry out the installation steps in one go to prevent any contamination from entering refrigerant lines between individual steps.

Keep the distance between the external and internal unit as small as possible to reduce heat losses.

While the appliance is operating you may hear ﬂow noises and noises from the compressor, particularly during the defrosting process.

≤5000 ≤5000

Note

The refrigerant does not have to be topped up. The appliance is pre-ﬁlled for the maximum permissible split line length (see chapter "Speciﬁcation / Data table").

D0000022488

www.stiebel-eltron.com WPL 15 IKS | WPL 25 IK | 23

STIEBEL ELTRON WPL 15 IKS-2, WPL 25 IK-2, WPL 15 IS-2, WPL 25 I-2 Operation And Installation

Specifications and Main Features

Frequently Asked Questions

User Manual