STIEBEL ELTRON WPL 13-20 S basic Operation Instruction

OPERATION AND INSTALLATION

Air source heat pump

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CONTENTS

SPECIAL INFORMATION

OPERATION

1. General information ��3

1.1 Further applicable 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 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

9. Preparations ��6

9.1 Acoustic emissions �� 6

9.2 Minimum clearances �� 7

9.3 Preparing the installation site�� 8

9.4 Electrical installation�� 10

9.5 Buffer cylinder �� 10

10. Mounting �� 10

10.1 Handling �� 10

10.2 Positioning �� 10

10.3 Heating water connection �� 11

10.4 Flow rate, heating side �� 12

10.5 Condensate drain ��13

10.6 Checking the condensate drain ��13

10.7 2. Heat source �� 14

10.8 Safety temperature controller for underﬂoor heating

system �� 14

11. Electrical connection �� 14

11.1 Fitting casing components �� 16

11.2 Routing air hoses �� 18

11.3 Fitting air hoses �� 19

11.4 Thermally insulating the wall outlets �� 19

12. Commissioning �� 20

12.1 Checks before commissioning�� 20

12.2 Commissioning �� 20

12.3 Settings �� 21

13. Taking the appliance out of use �� 22

13.1 Standby �� 22

13.2 Power interruption �� 22

14. Appliance handover �� 22

15. Troubleshooting �� 22

15.1 Elements on the IWS �� 22

15.2 Cleaning the condensate drain �� 23

15.3 Resetting the high limit safety cut-out �� 23

15.4 Fan noise �� 23

16. Maintenance �� 23

17. Speciﬁcation �� 24

17.1 Connections and dimensions, basic external

installation �� 24

17.2 Connections and dimensions, standard external

installation �� 24

17.3 Connections and dimensions, internal installation �� 25

17.4 Wiring diagram WPL basic standard appliance (3-

phase) �� 26

17.5 Wiring diagram WPL S basic (1-phase) �� 28

17.6 Output diagrams WPL 13 basic ��30

17.7 Output diagrams WPL 20 basic �� 31

17.8 Output diagrams WPL 13 S basic �� 32

17.9 Output diagrams WPL 18 S basic �� 33

17.10 Data table �� 34

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 experi-

ence provided that they are supervised or they

have been instructed on how to use the appliance

safely and have understood the resulting risks.

Children must never play with the appliance. Chil-

dren must never clean the appliance or perform

user maintenance unless they are supervised.

- Only use a permanent connection to the power

supply. The appliance must be able to be sepa-

rated from the power supply by an isolator that

disconnects all poles with at least 3mm contact

separation.

- Maintain the minimum clearances to ensure trou-

ble-free operation of the appliance and facilitate

maintenance work.

- Maintenance work, such as checking the electri-

cal safety, must only be carried out by a qualiﬁed

contractor.

- We recommend an annual inspection (to establish

the current condition of the system), and main-

tenance by a contractor if required (to return the

system to its original condition).

- The heat pump power supply must not be inter-

rupted, even outside the heating season. Other-

wise the system is at risk from frost.

- 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 entitled “Installation” is intended for qualiﬁed con-

tractors.

Note

Read these instructions carefully before using the appli-

ance and retain them for future reference.

Pass on the instructions to a new user if required.

1.1 Further applicable documents

 Operating and installation instructions of the heat pump

manager WPM

 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-

serious or minor injury.

!

OPERATION

Safety

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1.3 Other symbols in this documentation

Note

Notes are bordered by horizontal lines above and below

the text. General information is identiﬁed by the symbol

shown on the left.

 Read these texts carefully.

Symbol

Damage to the appliance and environment

Appliance disposal

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

tions you need to take are 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

Only qualiﬁed contractors should carry out installation, commis-

sioning, maintenance and repair of the appliance.

Contractors are responsible for adherence to all currently applica-

ble regulations during installation and commissioning.

2.1 Intended use

The appliance is intended to heat buildings and domestic hot water

(DHW). The appliance is designed for extracting energy from the

air and utilising this energy in water-based heating systems within

the stated operating temperature range.

This appliance is designed for domestic use. It can be safely oper-

ated by untrained personnel. The appliance can also be used in a

non-domestic environment, e.g. in a small business, as long as it

is used in the same way.

Any other use beyond that described shall be deemed inappropri-

ate. Observation of these instructions is also part of the correct use

of this appliance. Any changes or modiﬁcations to this appliance

void all warranty rights.

2.2 General safety instructions

Observe the following safety instructions and regulations.

- The electrical installation and installation of the heating cir-

cuit must only be carried out by a recognised, qualiﬁed con-

tractor or by our customer service engineers

- Contractors are responsible for adherence to all currently ap-

plicable regulations during installation and commissioning.

- Operate the appliance only when fully installed and with all

safety equipment ﬁtted

- Protect the appliance from dust and dirt ingress during

building work

!

WARNING Injury

The appliance may be used by children aged 8 and up

and persons with reduced physical, sensory or mental

capabilities or a lack of experience provided that they

are supervised or they have been instructed on how to

use the appliance safely and have understood the result-

ing risks. Children must never play with the appliance.

Children must never clean the appliance or perform user

maintenance unless they are supervised.

2.3 Test symbols

See type plate on the appliance.

3. Appliance description

The appliance is an air source heat pump that operates as a heating

heat pump. Heat is extracted from the outdoor air at a low temperature

level, and is then transferred to the heating water at a higher level.

The heating water can be heated up to a ﬂow temperature of 75 °C.

The appliance is equipped with an electric booster heater (DHC).

The electric booster heater is activated if the dual mode point is

not achieved in mono mode operation in order to ensure the heat-

ing operation and the availability of high DHW temperatures. In

such cases the electric booster heater is activated as an additional

heat source in mono energetic operation.

!

OPERATION

Settings

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Further operational characteristics:

- Suitable for underﬂoor and radiator heating systems

- Still extracts heat from the outdoor air at – 20 °C outside

temperature

- Corrosion-protected, external casing components made from

hot-dipped galvanised sheet steel plus powder-coated ﬁnish

- Comprises all components required for operation and all

safety equipment

- Filled with non-combustible safety refrigerant

Note

The heat pump manager is required for control over the

entire heating system.

3.1 Function

Heat is extracted from the outdoor air via the heat exchanger

(evaporator) on the air side. The now evaporated refrigerant is

compressed with one or two compressors. Electrical energy is

necessary for this process. Now, the refrigerant is at a higher

temperature level and transfers the heat drawn from the air via

an additional heat exchanger (condenser) to the heating system.

During this process, the refrigerant expands again, and the cycle

begins again.

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

condenses as hoarfrost on the evaporator ﬁns. This hoarfrost is

automatically defrosted. Water created from this defrosting col-

lects 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.

The heat pump automatically reverts to heating mode at the end

of the defrost cycle.

4. Settings

The appliance is controlled by means of the WMP II heat pump

manager; no other control unit is required.

 Observe the heat pump manager operating and installation

instructions.

5. Maintenance and care

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

parts. Never use abrasive or corrosive cleaning agents.

Check the condensate drain monthly (visual inspection). Remove

contaminants and blockages immediately.

!

Damage to the appliance and environment

Keep the air discharge and intake apertures free from

snow and leaves.

We recommend an annual inspection (establishing the actual

state) and, if required, maintenance (returning the set state) by a

qualiﬁed contractor.

6. Troubleshooting

Fault Cause Remedy

There is no hot

water or the

heating system

stays cold.

There is no voltage at the

appliance.

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.

Clean the condensate drain as

described in chapter ‚Care and

maintenance‘.

Indoor installa-

tion: 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 or dehumidified,

this condensate should no

longer form on the appliance ap-

prox.two years after the house

was built.

The humidity in the air is

relatively high (≥60%).

When the weather conditions

change, condensation should no

longer form on the appliance.

The appliance is located

in a moisture-prone

area. Moisture-prone

areas are rooms where

the humidity in the air is

high due to the drying of

laundry, for exam

ple.

Make sure that the room is

adequately ventilated and dehu-

midified. If necessary, hang your

laundry up 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 sealed.

Cold air escapes.

Check whether the air hoses are

correctly fitted and sealed. If

necessary, call your contractor.

Outdoor installa-

tion: Condensate

is collecting on

the outside of the

appliance.

The heat pump is

drawing heat from the

outdoor air to heat the

building. This can cause

the humidity in the out-

door air to accumulate

as dew or frost on the

cooled heat pump casing.

This is not a defect.

Note

Even when the condensate is draining away correctly,

expect water to drip from the appliance onto the ﬂoor.

If you cannot remedy the fault, notify your qualiﬁed contractor.

To facilitate and speed up your enquiry, please provide the serial

number from the type plate.

Sample type plate

Montageanweisung beachten! Dichtheit geprüft!

Made in Germany

*xxxxxxxxxxxxxxxxxx*

26�03�01�1736

1

1 Number on the type plate

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INSTALLATION

Safety

INSTALLATION

7. Safety

7.1 General safety instructions

- Only qualiﬁed contractors should carry out installation, com-

missioning, maintenance and repair of the appliance.

- We guarantee trouble-free function and operational reliabil-

ity 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

For external installation the appliance offers additional frost pro-

tection of the heating water pipes. The integral frost protection

circuit starts the circulation pump in the heat pump circuit auto-

matically at +8 °C condenser temperature, and thereby ensures

circulation in all water-ﬁlled sections. The heat pump is started

automatically no later than when the temperature inside the buffer

cylinder drops below +5 °C.

Air hoses guide the intake air from the outside to the appliance and

route the discharge air from the appliance to the outside. These

are highly ﬂexible, thermally insulated and are self-extinguishing

in case of ﬁre in accordance with ASTMD1692-67T.

8.1 Standard delivery

8.1.1 Standard appliance

- Type plate

- Wiring diagram

8.1.2 Required accessories, external installation

The appliance casing components are supplied in a separate pack.

Description

Accessory for outdoor installation WPL .. Basic

Accessory for outdoor installation WPL 13/18/23 A

8.1.3 Required accessories, internal installation

The appliance casing components are supplied in a separate pack.

Description

Accessory for indoor installation WPL 13/18/23 I

WPIC

WPIC B

8.2 Accessories

8.2.1 Required accessories, internal and external installation

Description

Heat pump manager WPMS 3 or WPMW 3

Remote control for heating systems

Contact sensor

Immersion sensor

8.2.2 Additional required accessories for internal installation

Description

Thermally insulated air hose, 3m or 4m long

Hose connection plate

Wall outlet AWG 560

8.2.3 Further accessories

Description

Buffer cylinder

Pressure hose G 1¼ x 1 m (DN 32)

Pressure hose G 1¼ x 2 m (DN 32)

Pressure hose G 1¼ x 5 m (DN 32)

Pressure hose G 1¼ x 1 m (DN 32), can be trimmed

Hose fittings for pressure hose G 1¼ (DN 32)

Condensate pump

9. Preparations

9.1 Acoustic emissions

On the air intake and air discharge sides, the appliance is louder

than on the enclosed sides. Observe the following information

when selecting the installation location.

Note

For details regarding the sound power level, see chapter

"Speciﬁcation / Data table".

9.1.1 Sound emissions for external installation

- Lawn areas and shrubs contribute to the reduction of noise.

- Noise propagation can also be reduced through dense pali-

sades or similar.

 Ensure that the air intake direction is in line with the main

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

 Never direct the air intake or discharge towards noise-sensi-

tive rooms of the house, e.g. bedrooms.

 Avoid installation on large, echoing ﬂoor areas, e.g. tiled

ﬂoors.

 Avoid installation between reﬂective building walls. Reﬂec-

tive building walls can increase the sound level.

Note

Provide a recess (space) in the substrate to enable water

and electrical pipes/cables to be connected from below.

Also observe the chapter “Installation/Siting”.

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INSTALLATION

Preparations

9.1.2 Sound emissions for internal installation

Never install the appliance directly below or next to living rooms

or bedrooms.

Never install on joists.

 Isolate the installation surface. See chapter “Preparing the

installation site for internal installation”.

 Connect the heating ﬂow and return using ﬂexible pres-

sure hoses. Suitable pressure hoses can be found in chapter

“Accessories”.

 Insulate all pipe ﬁxings and wall outlets against structure-

borne noise transmission.

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

nal walls towards neighbouring windows or living rooms/

bedrooms.

9.2 Minimum clearances

9.2.1 External installation

≥500 ≥500≥500

≥1000

≥700

D0000019239

≥500

≥1000

≥500

≥700

D0000019241

91�00�00�0036

 Do not install the appliance in a recess. Two sides of the ap-

pliance must remain exposed.

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

eration of the appliance and facilitate maintenance work.

 In order to prevent air “short circuits”, maintain the mini-

mum clearances in the case of surrounding structures and

in particular in the case of cascades. Maintain the ﬂow rate

on the heat source side (see chapter “Speciﬁcation / data

table“).

!

Damage to the appliance and environment

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 ob-

structed by surrounding objects, this may cause a thermal

short-circuit.

 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.

!

Damage to the appliance and environment

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 appli-

ance is not guaranteed.

 Ensure that the minimum air ﬂow rate is maintained. Ob-

serve 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.

Note

If the air discharge side faces house walls, maintain a

minimum clearance of 2m between the appliance and

the building.

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INSTALLATION

Preparations

9.2.2 Internal installation

≥500

≥1000

D0000019242

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

eration of the appliance and facilitate maintenance work.

9.3 Preparing the installation site

9.3.1 General information

 Ensure that the appliance is accessible from all sides.

- The substrate must be horizontal, level, solid and permanent.

 Observe the minimum clearances in chapter “Preparations/

Minimum clearances”.

 Ensure the entire heat pump frame is in contact with the sub-

strate. Uneven substrates can increase sound emissions.

9.3.2 Preparing the installation site for external installation

 Observe chapter “Sound emissions for external installation”.

Example: Foundations with recess

3

1

2

4

1000

1440

190

170

300

150

D0000019240

1 Air intake

2 Air discharge

3 Main wind direction

4 Recess

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INSTALLATION

Preparations

Example: Routing pipes underground

A

1

2

6

8

7

4

5

3

D0000019238

A Frost level

1 Heating circuit ﬂow

2 Heating circuit return

3 Conduit for supply lines

4 Foundation

5 Gravel bed

6 Drainage pipe

7 Condensate hose

8 Electrical cables/leads

 Use only cables suitable for outdoor use.

 Protect the ﬂow and return pipes against frost with sufﬁcient

thermal insulation. Provide thermal insulation in accordance

with applicable regulations.

 Protect all supply lines against humidity, damage and UV ra-

diation by means of a conduit.

Note

When routing the condensate hose, observe the chapter

“Installation / condensate drain”.

9.3.3 Preparing the installation site for internal installation

 Observe chapter “Sound emissions for internal installation”.

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

cesses. After completing the installation, seal these recesses

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

In chapter “Speciﬁcation/Connections and dimensions, internal

installation”, the location and dimensions of the air intake and

discharge apertures as well as those of the outlets/entries for

water pipes and cables in the appliance cover can be seen.

!

Material losses

The ﬂoor of the installation room must be water resistant.

During appliance operation, the outdoor air releases up

to 50l of condensate per day. If the condensate drain is

not installed correctly or if maintenance is not carried out

properly, water may escape. We recommend installing a

drain in the ﬂoor of the installation room.

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INSTALLATION

Mounting

9.4 Electrical installation

DANGER Electrocution!

Carry out all electrical connection and installation work

in accordance with national and regional regulations.

DANGER Electrocution!

Only use a permanent connection to the power supply.

The appliance must be able to be separated from the

power supply by an isolator that disconnects all poles

with at least 3mm contact separation. This requirement

can be met by contactors, isolators, fuses etc.

Note

The speciﬁed voltage must match the mains voltage. Ob-

serve the type plate.

Route cables with the following cross-sections in accordance with

the respective fuse rating:

Fuse rating Cable cross-section

C 16 A

2.5 mm²

1.5 mm² with only two live cores and routing on a wall or in

an electrical conduit on a wall

C 25 A 6.0 mm² for routing through a wall

4.0 mm² for routing multi-core cables on a wall or in an

electrical conduit on a wall

C 35 A 6.0 mm² for routing multi-core cables on a wall or in an

electrical conduit on a wall

The electrical speciﬁcations are given in the “Data table”. The BUS

cable requires a cable J-Y (St) 2x2x0.8mm².

Note

Provide separate fuses/MCBs for the 3 power circuits of

the appliance, the control unit and the electric booster

heater.

9.5 Buffer cylinder

A buffer cylinder is recommended to ensure trouble-free appliance

operation. The buffer cylinder not only provides hydraulic separa-

tion of the volume ﬂow in the heat pump and heating circuit, but

also serves as an energy source for defrosting the evaporator.

10. Mounting

10.1 Handling

 Pay attention to the appliance’s centre of mass when trans-

porting the appliance.

The centre of mass is located in the compressor area.

- Lifting slings for transporting the standard appliance can be

hooked in anywhere on the lower frame.

 Protect the appliance against heavy impact during transport.

- Only allow the appliance to be tilted during transport for a

short time to one of its longitudinal sides.

The longer the appliance is tilted, the greater the distribution

of refrigerant oil in the system. Wait approx. 30 minutes be-

fore starting the appliance after it has been tilted.

10.2 Positioning

10.2.1 General information

 Undo the ﬁxing screws on the appliance frame and keep

them safe. Two or four screws are provided in the frame

to secure the cover. One screw respectively is provided to

secure the side panels (see also chapter “Fitting the casing

components”).

Note

Fit the casing components only after the electrical and

hydraulic connections have been made.

10.2.2 Internal installation

 Position the standard appliance on the prepared substrate.

1

2

3

26�03�01�1650�

4

1 Connector

2 Union nut

3 Pipe bend, heating circuit return

4 Condensate drain hose

 Undo the union nut from the heating ﬂow.

 Rotate the connector approx. 145°.

 Retighten the union nut.

 Fit the pipe bend for the heating circuit return (part of the

“Internal installation accessories”).

 Route the condensate hose out of the appliance, either on the

r.h. or the l.h. side.

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INSTALLATION

Mounting

2

3

4

1

26�03�01�0170

6

5

1 Appliance power cable

2 Electric booster heater power cable

3 Control cable

4 BUS cable

5 Heating ﬂow

6 Heating return

 Position the cover on the appliance, and secure it with two

screws.

 Cut the pipe outlets for the water pipes out of the cover.

 Route the water pipes through the cover into the appliance.

 Then route the cables from above through the cable entries

with strain relief ﬁttings (PG ﬁttings) into the appliance.

The open PG ﬁttings are intended for the following: Appli-

ance power supply, control cable and BUS cable.

10.2.3 External installation

 Observe the air discharge direction.

 Position the standard appliance on the prepared substrate.

1

234

26�03�01�1644�

1 Condensate hose

2 Supply line outlet

3 Pipe bend, heating circuit ﬂow

4 Pipe bend, heating circuit return

 Fit the pipe bends for the heating circuit ﬂow and return

(part of the “External installation accessories”).

 Route the water pipes and the cables from below through the

cut-out in the ﬂoor into the appliance.

!

Material losses

Rodents may get into the appliance through the knock-

out aperture.

 Close off the knock-out aperture.

10.3 Heating water connection

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

must be installed by a qualiﬁed contractor in accordance with the

water installation drawings that are part of the technical docu-

ments.

 Thoroughly ﬂush the pipework before connecting the heat

pump. Debris, such as rust, sand and sealant, can impair the

operational reliability of the heat pump.

 Connect the heat pump on the heating water side. Check for

tightness.

 Connect ﬂexible pressure hoses to the connectors; these will

act as anti-vibration dampers.

The pressure hoses should be at least 1 m long.

10.3.1 Oxygen diffusion

!

Material losses

Avoid open heating systems and plastic pipes in under-

ﬂoor heating systems which are permeable to oxygen.

In underﬂoor heating systems with plastic pipes that are per-

meable to oxygen and in open vented heating systems, oxygen

diffusion may lead to corrosion on the steel components of the

heating system (e.g. on the indirect coil of the DHW cylinder, on

buffer cylinders, steel heating elements or steel pipes).

!

Material losses

The products of corrosion (e.g. rusty sludge) can settle in

the heating system components and can result in a lower

output or fault shutdowns due to reduced cross-sections.

10.3.2 Filling the heating system

Water quality

A ﬁll water analysis must be available prior to charging the sys-

tem. This may, for example, be requested from the relevant water

supply utility.

!

Material losses

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

sary to soften or desalinate the ﬁll water. The ﬁll water

limits speciﬁed in chapter "Speciﬁcation / Data table"

must always be observed.

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

ing and as part of annual system maintenance.

Note

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

is recommended in order to avoid corrosion.

12 | WPL basic | WPL S basic www.stiebel-eltron.com

INSTALLATION

Mounting

Note

Suitable appliances for water softening and desalinating,

as well as for charging and ﬂushing heating systems, can

be obtained via trade suppliers.

Note

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

same limits as for desalination apply.

Venting the heating system

1

26�03�01�1638�

1 Air vent valve

 Vent the pipework carefully. For this, also activate the air

vent valve integrated into the heating ﬂow inside the heat

pump.

10.4 Flow rate, heating side

10.4.1 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 circuit and the heating circuit in conjunction with space

heating systems.

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 carried out 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 source.

 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

0

2

4

6

8

10

12

84�03�01�0172

X Outside temperature [°C]

Y Maximum temperature differential [K]

In this case, one or more heating circuits in the heating system

must be left 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 carried

out with the remote control or indirectly by matching 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 tempera-

ture 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 primary pump.

The ﬂow rate of the cylinder primary pump has been

optimised 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 value is equal to or

lower than the maximum temperature differential.

www.stiebel-eltron.com WPL basic | WPL S basic | 13

INSTALLATION

Mounting

10.4.2 Flow rate with low loss header or buffer cylinder

The ﬂow rate can be adjusted using the temperature differential

of the buffer circuit. The value must not fall below the minimum

ﬂow rate.

Maximum temperature differential on the heating side with low

loss header or buffer cylinder

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

0

2

4

6

8

10

12

84�03�01�0172

X Outside temperature [°C]

Y Maximum temperature differential [K]

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

ture 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 chapter “Speciﬁcation / Data table”).

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

ting of the delivery head in DHW mode.

 If necessary, adjust the setting of the delivery head to match

the heating circuit pump.

10.4.3 Using highly energy efﬁcient pumps

If you use a highly energy efﬁcient 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.

When connecting the electric emergency/booster heater (DHC),

a ﬂow sensor must be connected to the heat pump manager and

installed close to the heat pump at the heating ﬂow.

10.5 Condensate drain

A condensate drain hose is ﬁtted to the defrost pan to enable the

condensate to drain off. The condensate drain hose is delivered

inside the refrigeration unit.

 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 is sized for a

pump rate of at least 6 l/min.

10.5.1 External installation

 Route the condensate drain hose downwards through the

knock-out “outlet for supply pipe/cable” and out of the

appliance.

 Channel the condensate into a drain or allow it to drain into a

coarse gravel soakaway. Ensure the pipework is free from the

risk of frost.

10.5.2 Internal installation

You can route the condensate drain hose to the left or right

through the knock-out “outlet for condensate drain” (see chapter

“Speciﬁcation / Dimensions and connections / Internal installa-

tion”) and out of the appliance.

26�03�01�0956

1

1 Knock-out “outlet for condensate drain”

 Use pliers to break out the knock-out “outlet for condensate

drain” from the l.h. side panel.

 Route the condensate drain hose to the left or right out of the

appliance.

 Route the condensate into a drain.

If a bottom drain is to be used, you can drain the condensate

downwards through the “outlet for supply pipe/cable” in the bot-

tom of the appliance.

 Route the condensate drain hose diagonally through the

knock-out aperture “outlet for supply pipe/cable”.

 Secure the condensate drain hose to ensure it does not slip

out of place.

 Route the condensate into the bottom drain.

10.6 Checking the condensate drain

After routing the condensate drain hose, check that the condensate

can drain correctly. Proceed as follows:

 Pour water onto the evaporator, which will then ﬂow into

the defrost pan. Please note the maximum condensate drain

capacity of 6 l/min.

 Check whether the water is draining off via the condensate

drain hose.

14 | WPL basic | WPL S basic www.stiebel-eltron.com

INSTALLATION

Electrical connection

10.7 2. Heat source

For dual mode systems, the heat pump must always be connected

to the return of the second heat source (for example an oil boiler).

10.8 Safety temperature controller for underﬂoor

heating system

!

Material losses

In case of failure, in order to prevent an excessively high

ﬂow temperature in the underﬂoor heating system, we

generally recommend the use of a safety temperature

controller to limit the system temperature.

11. Electrical connection

Note

Observe the heat pump manager operating and instal-

lation instructions.

Only qualiﬁed electricians may carry out the installation in accord-

ance with these instructions.

Permission to connect the appliance may need to be obtained from

your local power supply utility.

 Observe chapter “Preparing the electrical installation”.

DANGER Electrocution

Before any work, isolate the appliance from the power

supply at the control panel.

Note

The terminals are located in the appliance control panel.

1

26�03�01�1644�

2

1 Cable duct

2 Control panel

 For installation purposes, pull out the control panel forward

from the casing.

 Use appropriate cables in accordance with local regulations

for all connections.

 Check the function of the strain relief ﬁttings.

 Connect the circulation pump for the heat utilisation side to

the heat pump manager in accordance with the technical

documents.

 For external installation, route the cables through the cable

duct provided for this purpose.

11.8.1 Electrical connection of the WPL basic (three phase)

Connection X3: Appliance and electric emergency/booster

heater (DHC)

 Connect the appliance to terminal X3.

 Connect the electric emergency/booster heater to terminal X3

if you want to utilise the following appliance functions:

Appliance func-

tion

Effect of the electric emergency/booster

heater

Mono energetic op-

eration

If the heat pump cannot reach the dual mode point,

the electric emergency/booster heater ensures both

the heating operation and the provision of high DHW

temperatures.

Emergency mode

Should the heat pump suffer a fault that prevents its

continued operation, the heating output will be cov-

ered by the electric emergency/booster heater.

Heat-up program

(only for underfloor

heating systems)

The electric emergency/booster heater must provide

the drying heat in case of return temperatures <25°C.

With these low system temperatures, the drying heat

must not be provided by the heat pump, otherwise

the frost protection of the appliance can no longer be

guaranteed during the defrost cycle.

After expiry of the heat-up program, you can discon-

nect the electric emergency/booster heater if it is not

required for the appliance operation.

Please note that during the heat-up program, the

emergency mode cannot be selected.

Pasteurisation control

The electric emergency/booster heater starts automat-

ically when the pasteurisation control is active in order

to regularly heat the DHW to 60 °C to protect it against

the growth of legionella bacteria.

www.stiebel-eltron.com WPL basic | WPL S basic | 15

INSTALLATION

Electrical connection

PE

1

2

26�03�01�1640�

1 Power supply (heat pump, compressor)

L1, L2, L3, N, PE

2 Elect. 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

!

Damage to the appliance and environment

The compressor in the appliance can only turn in one

direction. If the appliance is not connected correctly, the

compressor remains in operation for 30 seconds then

switches off.

On the heat pump manager display, the fault message NO OUTPUT

appears.

 To change the direction of the rotating ﬁeld, when the power

is disconnected, swap over two phases.

 Cover and seal the mains terminal (X3) when all electric ca-

bles have been connected.

Terminals X4, X2, control and LV

X2

X4

1

2

26�03�01�1641�

1 Control terminals

Power supply: L, N, PE

Control inputs:

2. Heat source

Ext. ST Stand alone operation

2 LV terminal

BUS high H

BUS low L

BUS ground “+” (not connected)

11.8.2 Electrical connection of the WPL S basic (single phase)

Connection X3: Appliance and electric emergency/booster

heater (DHC)

 Connect the appliance to terminal X3.

 Connect the electric emergency/booster heater to terminal X3

if you want to utilise the following appliance functions:

Appliance func-

tion

Effect of the electric emergency/booster

heater

Mono energetic op-

eration

If the heat pump cannot reach the dual mode point,

the electric emergency/booster heater ensures both

the heating operation and the provision of high DHW

temperatures.

Emergency mode

Should the heat pump suffer a fault that prevents its

continued operation, the heating output will be cov-

ered by the electric emergency/booster heater.

Heat-up program

(only for underfloor

heating systems)

The electric emergency/booster heater must provide

the drying heat in case of return temperatures <25°C.

With these low system temperatures, the drying heat

must not be provided by the heat pump, otherwise

the frost protection of the appliance can no longer be

guaranteed during the defrost cycle.

After expiry of the heat-up program, you can discon-

nect the electric emergency/booster heater if it is not

required for the appliance operation.

Please note that during the heat-up program, the

emergency mode cannot be selected.

Pasteurisation control

The electric emergency/booster heater starts automat-

ically when the pasteurisation control is active in order

to regularly heat the DHW to 60 °C to protect it against

the growth of legionella bacteria.

16 | WPL basic | WPL S basic www.stiebel-eltron.com

INSTALLATION

Electrical connection

PE

1

2

26�03�01�1652�

1 Power supply (heat pump, compressor)

L, N, PE

2 Elect. booster heater (DHC)

L, L´, N, PE

Connected load Terminal assignment

3.0 kW L N PE

3.2 kW L´ N PE

6.2 kW L L´ N PE

 Cover and seal the mains terminal (X3) when all electric ca-

bles have been connected.

Terminals X4, X2, control and LV

X2

X4

1

2

26�03�01�1651�

1 Control terminals

Power supply: L, N, PE

Control inputs:

2. Heat source

Ext. ST Stand alone operation

2 LV terminal

BUS high H

BUS low L

BUS ground

BUS “+” (not connected)

11.1 Fitting casing components

11.1.1 Fitting the casing components for the standard external

installation

2

1

3

1

4

26�03�01�0929

1 Side panel

2 Cover

3 Front panel

4 Back panel

www.stiebel-eltron.com WPL basic | WPL S basic | 17

INSTALLATION

Electrical connection

26�03�01�1738

1

2

3

1 Bevelled edge

2 Control panel

3 Screw

!

Material losses

The cover protects the PCB from water ingress.

 Install the cover with the drip edge above the PCB.

 Position the cover on the appliance, and secure it with two

screws.

 Hook the side panels and front and back doors onto the

standard appliance. Secure these with a screw each.

 Afﬁx the type plate supplied to the front at the top in a clearly

visible location on the r.h. or l.h. side panel of the appliance.

11.1.2 Fitting the casing components for the basic external

installation

2

1

3

4

5

26�03�01�1637�

1 Side panel, r.h.

2 Cover

3 Front panel

4 Side panel, l.h.

5 Back panel

 Hook the side panels into the hooks provided on the standard

appliance and secure them with one screw each.

!

Material losses

The cover protects the PCB from water ingress.

 Install the cover with the drip edge above the PCB.

 Position the cover on the appliance, and secure it with four

screws.

 Hook the front and back panels into the hooks provided on

the standard appliance and secure them with one screw

each.

 Afﬁx the type plate supplied to the front at the top in a clearly

visible location on the r.h. or l.h. side panel of the appliance.

11.1.3 Fitting the casing components for internal installation

Before ﬁtting the casing sections, seal the appliance by afﬁxing

a plastic ﬁlm; this will prevent condensation forming under all

operating conditions.

The plastic ﬁlm is supplied with the casing sections.

26�03�01�1456

 Apply fabric tape to seal the hole at the bottom of the frame

on the l.h. side. The fabric tape is supplied with the accessory

“thermally insulated air hose”.

26�03�01�1454

18 | WPL basic | WPL S basic www.stiebel-eltron.com

INSTALLATION

Electrical connection

 Hang the ﬁlm with the pre-cut holes onto the hooks on the

appliance.

26�03�01�1455

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

and on the plastic ﬁlm.

 Secure the plastic ﬁlm by pressing it onto the appliance.

 Seal the gaps around the hooks with fabric tape.

Fitting casing components

2

1

3

1

4

26�03�01�1443

1 Side panel

2 Cover

3 Front panel

4 Back panel

 Position the cover on the appliance, and secure it with two

screws.

 Hook the side panels and front and back doors onto the

standard appliance. Secure these with a screw each.

 Afﬁx the type plate supplied to the front at the top in a clearly

visible location on the r.h. or l.h. side panel of the appliance.

11.2 Routing air hoses

Note

In the case of heat pumps installed indoors, if a blower

door test to EN 13829 is to be carried out, then all aper-

tures which are purposely provided in the building en-

velope must be closed or sealed off before the air hoses

are installed.

 For the blower door test, seal off the heat pump’s

supply air and extract air ducts.

You can extend the air hoses by unwinding the coils. There should

be an overlap of approx. 30 cm. The total length of hoses on the

air intake and discharge side 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 line of the

hose).

 Cut to size using a sharp knife. The Bowden core can be cut

with wire cutters.

 Secure the air hose at approx. 1 m intervals. This prevents

the hose from sagging because of its ﬂexibility.

 Match the air hose ends to the shape of the oval connectors

on the cover and the hose connection plates. The hose con-

nection plates are available as accessories.

2

3

1

2

4

26�03�01�0930�

1 Hose connection plate

2 Hose clip (oval)

3 Air hose

4 Cover

Hose connection plate dimensions

1173

778

302

687

D0000017278

www.stiebel-eltron.com WPL basic | WPL S basic | 19

INSTALLATION

Electrical connection

!

Damage to the appliance and environment

In any case, cover the external apertures with a wire

mesh. Secure the hoses against slippage.

11.3 Fitting air hoses

The example below shows the air hose connection being ﬁtted.

26�03�01�1446

 Firstly, push the outer hose slightly upwards.

26�03�01�1447

 Push the inner hose halfway over 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.

26�03�01�1450

 Pull the outer hose over the connector.

26�03�01�1452

 Secure the hose using the oval hose clip provided.

26�03�01�1453

11.4 Thermally insulating the wall outlets

Cold bridges must not be able to form between the wall outlets to

be created on site and the brickwork. Provide suitable insulation

between the wall outlets and the brickwork to prevent condensate

from forming in the brickwork.

As an alternative you could also use the thermally insulated AWG

560 wall outlet. The AWG 560 wall outlet is available as an ac-

cessory.

20 | WPL basic | WPL S basic www.stiebel-eltron.com

INSTALLATION

Commissioning

12. Commissioning

Note

When quick start is used, the starting resistors are not

patched in.

 Do not use quick start when measuring the starting

current.

A heat pump manager is required to operate the appliance. All

necessary adjustments prior to and during operation are made

on this unit.

Only heating contractors may carry out the adjustments on the

heat pump manager commissioning report, commission the ap-

pliance and instruct the owner in its use.

Commissioning is to be carried out in accordance with these instal-

lation instructions and the operating and installation instructions

of the heat pump manager. Our customer service can assist in the

commissioning, which is chargeable.

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

the relevant Health & Safety at Work Act may be applicable for

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

ising body.

12.1 Checks before commissioning

Before commissioning, check the following points:

12.1.1 Heating system

- Have you ﬁlled the heating system to the correct pressure,

and opened the quick-acting air vent valve?

12.1.2 Temperature sensor

- Have you correctly located and connected the outside tem-

perature sensor and the external return temperature sensor

(in conjunction with a buffer cylinder)?

12.1.3 Power supply

- Have you correctly connected the power supply?

-

12.1.4 High limit safety cut-out

In ambient temperatures of below -15 °C it is possible that the high

limit safety cut-out of the electrical emergency/booster heater

may trip.

 Check whether the high limit safety cut-out has tripped.

26�03�01�1023�

1

2

1 High limit safety cut-out reset button

2 Electric emergency/booster heater

 Reset the high limit safety cut-out by pressing the reset

button.

12.2 Commissioning

12.2.1 DIP switch (“WP-Typ”)

 Open the control panel.

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

BA

26�03�01�0921�

3

4

1

2

1 LEDs

2 DIP switch (WP-Typ)

3 Reset button

4 DIP switch (BA)

With the DIP switch (“WP-Typ”), you can select the various heat

pump types on the IWS.

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STIEBEL ELTRON WPL 13-20 S basic Operation Instruction

STIEBEL ELTRON WPL 13-20 S basic Operation Instruction

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