STIEBEL ELTRON WPL 33 Operation Instruction

Brand: STIEBEL ELTRON

Model: WPL 33

Category: Heat pumps

Type: Operation Instruction

OPERATION AND INSTALLATION

Air | water heat pump

» WPL 33

2 |WPL 33 www.stiebel-eltron.com

CONTENTS

SPECIAL INFORMATION

OPERATION

1. General information ��4

1.1 Relevant documents_____________________________________________ 4

1.2 Safety instructions _______________________________________________ 4

1.3 Other symbols in this documentation _______________________ 4

1.4 Units of measurement __________________________________________ 4

1.5 Standardised output data ______________________________________ 4

2. Safety �� 5

2.1 Intended use ______________________________________________________ 5

2.2 General safety instructions ____________________________________ 5

2.3 Test symbols ______________________________________________________ 5

3. Appliance description ��5

3.1 Function ___________________________________________________________ 5

4. Settings ��5

5. Maintenance and care ��6

6. Troubleshooting ��6

INSTALLATION

7. Safety �� 7

7.1 General safety instructions ____________________________________ 7

7.2 Instructions, standards and regulations ____________________ 7

8. Appliance description ��7

8.1 Standard delivery ________________________________________________ 7

8.2 Required accessories ___________________________________________ 7

8.3 Further accessories______________________________________________ 7

9. Preparations ��7

9.1 Sound emissions _________________________________________________ 7

9.2 Minimum clearances ____________________________________________ 8

9.3 Substrate __________________________________________________________ 8

9.4 Electrical installation___________________________________________ 10

9.5 Buffer cylinder __________________________________________________ 10

10. Installation �� 10

10.1 Transport _________________________________________________________ 10

10.2 Siting and connecting the appliance ________________________ 10

10.3 Heating water connection _____________________________________ 12

10.4 Heat meter �� 12

10.5 Safety temperature controller for underﬂoor heating

system ____________________________________________________________ 12

10.6 Flow rate on the heating side ________________________________ 12

10.7 Condensate drain _______________________________________________ 14

10.8 Second heat generator ________________________________________ 14

10.9 Checking fans ____________________________________________________ 14

11. Power supply �� 14

11.1 Control panel ____________________________________________________ 14

12. Fitting casing components �� 16

12.1 Outdoor installation ____________________________________________ 16

12.2 Indoor installation ______________________________________________ 16

12.3 Routing air hoses _______________________________________________ 18

13. Commissioning �� 19

13.1 Checks before commissioning the heat pump manager 19

13.2 Commissioning the heat pump manager __________________ 19

13.3 Initial start-up ___________________________________________________ 20

13.4 Settings ___________________________________________________________ 20

14. Shutdown �� 21

14.1 Standby mode ___________________________________________________ 21

14.2 Power interruption _____________________________________________ 21

15. Appliance handover �� 21

16. Troubleshooting �� 22

16.1 Controls on the IWS ____________________________________________ 22

16.2 Resetting the high limit safety cut-out _____________________ 22

16.3 Fan noise _________________________________________________________ 23

17. Maintenance �� 23

18. Speciﬁcation �� 24

18.1 Dimensions and connections ________________________________ 24

18.2 Wiring diagram _________________________________________________ 26

18.3 Power diagrams WPL 33 single compressor partial

load operation ___________________________________________________ 28

18.4 Power diagrams WPL 33 twin compressor full load

operation _________________________________________________________ 29

18.5 Data table ________________________________________________________ 30

GUARANTEE

ENVIRONMENT AND RECYCLING

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SPECIAL INFORMATION

- The appliance may be used by children aged8

and older and persons with reduced physical,

sensory or mental capabilities or a lack of ex-

perience 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 ap-

pliance or perform user maintenance unless they

are supervised.

- The connection to the power supply must be in

the form of a permanent connection. Ensure the

appliance can be separated from the power sup-

ply by an isolator that disconnects all poles with

at least 3mm contact separation.

- Maintain the minimum clearances to ensure trou-

ble-free operation of the appliance and facilitate

maintenance work.

- 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 qualiﬁed contractor if required (to

return the system to its original condition).

- Never interrupt the power supply, even outside

the heating season. The system's active frost pro-

tection is not guaranteed if the power supply is

interrupted.

- 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

General information

4 |WPL 33 www.stiebel-eltron.com

OPERATION

1. General information

The chapters “Special Information” and “Operation” are intended

for both the user and qualiﬁed contractors.

The chapter "Installation" is intended for qualiﬁed contractors.

Note

Read these instructions carefully before using the appli-

ance and retain them for future reference.

Pass on the instructions to a new user if required.

1.1 Relevant documents

 Operating and installation instructions for the WPM heat

pump manager

 Operating and installation instructions for system

components

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

Read the text next to these symbols carefully.

Symbol Type of risk

Injury

Electrocution

1.2.3 Keywords

KEYWORD Meaning

DANGER Failure to observe this information will result in serious

injury or death.

WARNING Failure to observe this information may result in serious

injury or death.

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

ous or minor injury.

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 adjacent

symbol.

 Read these texts carefully.

Symbol Meaning

Material losses

(appliance damage, consequential losses and environmen-

tal pollution)

Appliance disposal

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

tion you need to take is described step by step.

1.4 Units of measurement

Note

All measurements are given in mm unless stated oth-

erwise.

1.5 Standardised output data

Explanations to determine and interpret the speciﬁed standardised

output data.

1.5.1 Standard: EN 14511

The output data speciﬁcally mentioned in text, diagrams and

technical datasheets has been calculated according to the test

conditions of the standard shown in the heading of this section.

Generally, these standardised test conditions will not fully meet

the conditions found at the installation site of the system user.

Depending on the chosen test method and the extent to which

this method deviates from the conditions deﬁned in the norm

shown in the heading of this section, any deviations can have a

considerable impact.

Further factors that have an inﬂuence on the test values are the

measuring equipment, the system conﬁguration, the age of the

system and the ﬂow rates.

A conﬁrmation of the speciﬁed output data can only be obtained

if the test conducted for this purpose is also performed in ac-

cordance with the conditions deﬁned in the norm shown in the

heading of this section.

OPERATION

Safety

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2. Safety

2.1 Intended use

The appliance is intended to heat buildings and domestic hot

water. The appliance is designed for extracting energy from the

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

the stated operating temperature ranges.

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

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

mestic environment, e.g.in a small business, as long as it is used

in the same way.

Any other use beyond that described shall be deemed inappropri-

ate. Observation of these instructions and of instructions for any

accessories used is also part of the correct use of this appliance.

2.2 General safety instructions

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 support engineers.

- The qualiﬁed contractor is responsible for adherence to

all currently applicable 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 older

and persons with reduced physical, sensory or mental

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

vided that they are supervised or they have been in-

structed on how to use the appliance safely and have

understood the resulting risks. Children must never play

with the appliance. Children must never clean the ap-

pliance or perform user maintenance unless they are

supervised.

2.3 Test symbols

See type plate on the appliance.

3. Appliance description

The appliance is an air|water heat pump that operates as a heat-

ing 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 temperature. The heating water can be heated up to a

ﬂow temperature of 60°C.

The appliance is equipped with an electric emergency/booster

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

operation, the electric emergency/booster heater is activated to

safeguard heating operation and the provision of high DHW tem-

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

emergency/booster heater is activated as a booster heater.

Operational characteristics:

- Suitable for underﬂoor and radiator heating

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

temperature.

- Corrosion-protected, external casing made from zinc-plated

sheet steel plus powder-coated ﬁnish.

- Comprises all components and safety equipment required for

operation.

- Filled with non-combustible safety refrigerant.

Note

To control the heating system, you will need the heat

pump manager WPM.

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. This process requires

electrical energy. The refrigerant is then at a higher temperature

level and transfers the heat drawn from the air to the heating

system via an additional heat exchanger (condenser). During this

process, the refrigerant expands, and the cycle restarts from the

beginning.

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

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

tomatically defrosted. Water created from this defrosting process

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

In the defrost cycle, the fan is switched off and the heat pump

circuit is reversed. The heat required for defrosting is drawn from

the buffer cylinder.

The heat pump automatically reverts to heating mode at the end

of the defrost cycle.

4. Settings

The appliance is controlled by the heat pump manager WPM and

does not require any special operator actions.

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

lation instructions.

OPERATION

Maintenance and care

6 |WPL 33 www.stiebel-eltron.com

5. Maintenance and care

Material losses

Maintenance work, such as checking the electrical safety,

must only be carried out by a qualiﬁed contractor.

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

ing building work.

 A damp cloth is sufﬁcient for cleaning all plastic and sheet

metal parts. Never use abrasive or corrosive cleaning agents.

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

rectly (visual inspection). Remove contaminants and block-

ages immediately. When doing so, check whether water is

collecting below or next to the appliance. Observe the "Trou-

bleshooting" chapter.

We recommend an annual inspection (to establish the current con-

dition of the system), and maintenance by a qualiﬁed contractor if

required (to return the system to its original condition).

Material losses

Keep the air discharge and intake apertures free from

snow and leaves.

6. Troubleshooting

Fault Cause Remedy

There is no hot

water or the

heating system

stays cold.

No power at the appli-

ance.

Check the fuses/MCBs in your

fuse box/distribution panel. Re-

place the fuses/reset the MCBs

if required. Notify your qualified

contractor if the fuses/MCBs

blow/trip again.

Water is leaking

from the appli-

ance.

The condensate drain

may be blocked.

Clean the condensate drain as

described in "Maintenance and

care".

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 and dehumidified,

this condensate should no

longer form on the appliance ap-

prox.two years after the house

was built.

The relative humidity in

the air is high (≥60%).

A change in weather conditions

should no longer cause conden-

sation to form on the appliance.

The appliance is sited

in a damp room. Damp

rooms are those where

humidity in the air is high

due to the drying of laun-

dry, for example.

Ensure that the room is ade-

quately ventilated and dehumid-

ified. If necessary, hang your

laundry in a different room.

Use a vented tumble dryer.

Please note that condenser

tumble dryers do not reduce the

humidity in the air.

The air hoses are incor-

rectly fitted or poorly

sealed.

Cold air escapes.

Check whether the air hoses are

correctly fitted and sealed. If

necessary, refer to your qualified

contractor.

Outdoor installa-

tion: Condensate

is collecting on

the outside of the

appliance.

The heat pump is draw-

ing heat from the outdoor

air to heat the building.

This can cause the hu-

midity in the outdoor 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. The type plate is located at the front

top, on the right or left hand side of the casing.

Sample type plate

Montageanweisung beachten! Dichtheit geprüft!

Made in Germany

*xxxxxxxxxxxxxxxxxx*

26_03_01_1736

1 Number on the type plate

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INSTALLATION

Safety

INSTALLATION

7. Safety

Only a qualiﬁed contractor should carry out installation, commis-

sioning, maintenance and repair of the appliance.

7.1 General safety instructions

We guarantee trouble-free function and operational reliability only

if original accessories and spare parts intended for the appliance

are used.

7.2 Instructions, standards and regulations

Note

Observe all applicable national and regional regulations

and instructions.

8. Appliance description

For outdoor installation the appliance offers additional frost pro-

tection of the heating water pipes. The integral frost protection

circuit starts the heating circuit pump in the heat pump circuit

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

sures circulation in all water-ﬁlled sections.

The heat pump starts automatically when the temperature in the

heat pump circuit drops below +5°C.

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

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

perature must not exceed 60 °C.

8.1 Standard delivery

The casing components for the appliance are delivered in a sep-

arate pack.

8.1.1 Standard appliance

- Type plate

8.1.2 Casing components – outdoor installation

- Hood – outdoor installation

- Front panel

- Back panel

- Pipe bend, heating circuit ﬂow

- Pipe bend, heating circuit return

8.1.3 Casing components – indoor installation

- Hood – outdoor installation

- Front panel

- Back panel

- Pipe bend, heating circuit return

8.2 Required accessories

8.2.1 Required accessories for outdoor installation

- Heat pump manager WPM

- Accessories – outdoor installation

- Pressure hoses SD25 or SD32

8.2.2 Required accessories for indoor installation

- Heat pump manager WPM

- Accessories – indoor installation

- Pressure hoses SD25 or SD32

8.3 Further accessories

8.3.1 Further accessories for outdoor installation

- Remote control for heating systems FE7

- Remote control for heating systems FEK

- Water softener HZEA

8.3.2 Further accessories for indoor installation

- Air hose DN560 x 4 m

- Hose connection panel 560

- Wall outlet AWG 560 H

- Wall outlet AWG 560 V

- Wall outlet AWG 560 L

- Wall outlet AWG 600 L

- Remote control for heating systems FE7

- Remote control for heating systems FEK

- Condensate pump PK 10

- Water softener HZEA

9. Preparations

9.1 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".

9.1.1 Sound emissions for outdoor installation

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

- Noise propagation can also be reduced through dense pali-

sades or similar.

 Ensure that the air intake direction is the same as the dom-

inant 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.

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INSTALLATION

Preparations

 Avoid installation between reﬂective building walls. Reﬂect-

ing building walls can increase the noise level.

9.1.2 Sound emissions for indoor installation

- Never install on joists.

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

rooms or bedrooms.

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

nal walls towards neighbouring windows or living rooms/

bedrooms.

9.2 Minimum clearances

9.2.1 Outdoor installation

≥500

≥1000

≥500

≥700

D0000019241

91_00_00_0036

 Never 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 minimum

clearances in the case of surrounding structures and in par-

ticular in the case of cascades. Maintain the ﬂow rate on the

heat source side (see chapter "Speciﬁcation / data table").

Material losses

Please note that both the ﬂow of outdoor air into the

appliance, and the ﬂow of exhaust air from the appliance

must be unimpeded.

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 fully enclosed by objects

such as buildings, walls or fences.

 If necessary, maintain a greater clearance to the surrounding

objects.

Material losses

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 a house,

the cool air from the air discharge may cause condensate to form

on this wall.

Note

If the air discharge side faces house walls, maintain a

minimum clearance of 2m between the appliance and

the building.

9.2.2 Indoor installation

≥500

≥1000

≥200

≥1000

≥500

D0000019311

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

eration of the appliance and facilitate maintenance work.

9.3 Substrate

General information

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

 Ensure that the base is level, even, solid and permanent.

 Ensure the entire appliance frame is in full contact with the

substrate. Uneven substrates can increase noise emissions.

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INSTALLATION

Preparations

9.3.1 Outdoor installation

Provide a recess (space) in the base to enable supply pipes/cables

to be routed into the appliance from below.

Foundations with recess

1390

270

50150

800

D0000023464

1 Air discharge

2 Air intake

3 Main wind direction

4 Recess

 Ensure that the foundations offer an adequate recess.

Example: Routing pipes in the base

1 2

D0000019237

A Depth of frost line

1 Heating circuit ﬂow

2 Heating circuit return

3 Conduit for supply lines/cables

4 Foundation

5 Gravel bed

6 Drainage pipe

7 Condensate drain hose

8 Electrical cables/leads

Observe the following information:

 Only use weather-resistant cables.

 Protect the heating circuit ﬂow and return lines against frost

with sufﬁcient thermal insulation. Provide thermal insulation

in accordance with applicable regulations.

 Also protect all supply lines/cables against humidity, damage

and UV radiation by means of a conduit.

Note

When routing the condensate drain hose, observe chapter

"Installation / Condensate drain".

9.3.2 Indoor installation

1 2 3 54

26_03_01_1466

1 Concrete base

2 Impact sound insulation

3 Floating screed

4 Floor covering

5 Recess

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

cess. After completing the installation, seal the recess with

a water-impervious and sound insulating material, such as

silicone for example.

Observe the following information:

 Connect the heating circuit ﬂow and return lines via ﬂexible

pressure hoses. Suitable pressure hoses are listed in chap-

ter "Appliance description / Required accessories for indoor

installation".

 Protect all pipe ﬁxings and wall transitions with anti-vibra-

tion insulation.

Note

For details of the dimensions and positions of the air

intake and discharge apertures, as well as the outlets for

hydraulic lines and power cables, see chapter "Speciﬁca-

tion / Dimensions and connections / indoor installation".

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

Installation

9.4 Electrical installation

WARNING Electrocution

Carry out all electrical connection and installation work

in accordance with national and regional regulations.

WARNING Electrocution

Only 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. This requirement can be

met with contactors, circuit breakers, fuses/MCBs, etc.

Note

The speciﬁed voltage must match the mains voltage.

 Observe the type plate.

Route cables with the following cross-sections in accordance with

the respective fuse rating:

MCB/fuse

rating

Conductor cross-section

16 A

2.5 mm²

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

electrical conduit on a wall.

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

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

Material losses

Provide separate fuses/MCBs for the three power circuits

of the appliance, the control unit and the electricemer-

gency/booster heater.

Material losses

Provide common fuses/MCBs for the control cable of the

appliance and the heat pump manager.

9.5 Buffer cylinder

A buffer cylinder is recommended to ensure trouble-free appliance

operation.

The buffer cylinder is not only installed to provide hydraulic sep-

aration of the ﬂow rates in the heat pump circuit and the heating

circuit, but also as an energy source for defrosting.

10. Installation

10.1 Transport

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

porting the appliance.

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

located.

- Lifting slings for handling the standard appliance can be

hooked in anywhere on the bottom of the frame.

 Protect the appliance against heavy impact during transport.

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

for a short time on one of its longitudinal sides.

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

of refrigerant oil in the system.

 Wait approximately 30minutes before starting the appliance

after it has been tilted.

10.2 Siting and connecting the appliance

Note

- Two screws are available at the top of the appliance

frame to secure the cover.

- In the frame at the bottom, one screw is available on

each side to secure the side panels.

Wind the sixscrews out of the appliance frame and keep them safe.

Material losses

After installing the heat pump, tighten the pipe ﬁttings

on the pressure and inlet lines of the compressor with a

torque of 100Nm.

26_03_01_0670

1 Pressure line ﬁttings

2 Suction line ﬁttings

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INSTALLATION

Installation

10.2.1 Outdoor installation

 Pay attention to the air discharge direction.

 Remove the knock-out "outlet for supply pipe/cable" in the

bottom of the appliance.

 Position the standard appliance on the prepared substrate.

2 3

26_03_01_0669

1 Condensate drain hose

2 Heating ﬂow (ﬂexible pressure hose with thermal insulation)

3 Heating return (ﬂexible pressure hose with thermal

insulation)

4 Electrical cables/leads

5 Cable entry for electrical cables

6 Control panel

7 Conduit for supply lines/cables

8 Pipe bend (included in the accessories)

9 Heating ﬂow connectors

10 Air vent valve

 Install the pipe bend for the heating circuit return (compo-

nent from "Accessories for outdoor installation").

 Install the pressure hoses and pipe bends for the heating

circuit ﬂow and return (part of "Accessories for outdoor

installation").

 Route the water pipes and electrical cables into the appliance

from below through the knock-outs in the base.

Note

Do not ﬁt the casing components until the electrical and

hydraulic connections have been made.

10.2.2 Indoor installation

 Position the standard appliance on the prepared substrate.

26_03_01_0670

1 Condensate drain hose

2 Heating ﬂow (ﬂexible pressure hose with thermal insulation)

3 Heating return (ﬂexible pressure hose with thermal

insulation)

4 Electrical cables/leads

5 PG ﬁtting with strain relief

6 Pipe outlet

7 Control panel

8 Pipe bend (included in the accessories)

9 Heating return connector

 Install the pipe bend for the heating circuit return (compo-

nent from "Accessories for indoor installation").

 Route the condensate drain hose either to the right, left or

front of the appliance.

5 4 36

26_03_01_1687_

1 Heating return

2 Heating ﬂow

3 Appliance power cable

4 Electric emergency/booster heater power cable

5 Control cable

6 BUS cable

 Place the hood on the appliance and secure with two screws.

 Cut out the hood to accommodate the water pipe outlets.

 Route the pressure hoses from above through the cover and

into the appliance.

 Route the electrical cables from above into the appliance

through the cable entries and through the strain relief ﬁt-

tings (PG ﬁttings).

The open PG ﬁttings are used to route the power cable for

the appliance, control cable and BUS cable.

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INSTALLATION

Installation

10.3 Heating water connection

Material losses

The heating system to which the heat pump is connected

must be installed by a qualiﬁed contractor in accordance

with the water installation drawings that are part of the

technical guides.

 Thoroughly ﬂush the pipework before connecting the heat

pump. Foreign bodies, such as rust, sand or sealant can im-

pair the operational reliability of the heat pump.

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

tightness.

 Connect the ﬂexible pressure hoses to the connectors.

The pressure hoses must be at least 1 metre long.

Structure-borne noise is largely prevented by the anti-vibration

construction of the heat pump and by the ﬂexible pressure hoses,

which act as anti-vibration mounts.

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.

10.3.1 Filling the heating system

Heating water quality

Carry out a ﬁll water analysis before the system is ﬁlled. The ﬁll

water analysis may 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. Always observe

the ﬁll water limits speciﬁed in the "Speciﬁcation / Data

table" chapter.

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

ing and during the annual system service.

Note

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

is recommended in order to avoid corrosion.

Note

Suitable appliances for water softening, as well as for

ﬁlling 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

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

vent valve integrated into the heating ﬂow inside the heat

pump.

10.4 Heat meter

Material losses

When installing a heat meter, note that most heat me-

ters cause a substantial pressure drop, and therefore you

should select a larger circulation pump.

10.5 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.

10.6 Flow rate on the heating side

10.6.1 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 area heat-

ing 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 made ﬁrst:

 Temporarily remove the fuse from the electric emergency/

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

tively, switch OFF the second heat generator.

 Operate the heat pump in heating mode.

www.stiebel-eltron.com WPL 33 | 13

INSTALLATION

Installation

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

Maximum temperature differential on the heating side with over-

ﬂow valve or single room control with remote control

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

84_03_01_0156_

X Outside temperature [°C]

Y Maximum temperature differential [K]

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

ed with the remote control or indirectly by adapting the heating

curve.

 Fully open the heating circuit(s) in the lead room.

 Close all other heating circuits.

 If an overﬂow valve is installed in the heating system, close

this fully before determining the minimum ﬂow rate.

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

ature differential between the ﬂow and return temperature

has stabilised.

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

quired to operate the system is safeguarded.

Note

Never adjust the ﬂow rate of the cylinder circuit pump.

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

timised at the factory.

 Compare the resulting temperature differential between the

ﬂow and return at the appliance with the diagram "Maximum

temperature differential on the heating side with overﬂow

valve or single room control with remote control".

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

ture differential is achieved or undershot.

10.6.2 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

84_03_01_0156_

X Outside temperature [°C]

Y Maximum temperature differential [K]

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

ature differential between the ﬂow and return temperature

has stabilised.

 Compare the resulting temperature differential between the

ﬂow and return at the appliance with the diagram "Maximum

temperature differential on the heating side with low loss

header or buffer cylinder".

 Set the head of the heating circuit pump to a level that safe-

guards 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 pump head in DHW mode.

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

pump.

10.6.3 Using highly energy efﬁcient pumps [HE]

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

adjust the minimum ﬂow rate using the temperature differential

of the heating system.

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

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

ature differential of the heating system is reached.

14 |WPL 33 www.stiebel-eltron.com

INSTALLATION

Power supply

10.7 Condensate drain

A hose is ﬁtted at the factory to the defrost pan to act as conden-

sate drain. The hose terminates near the knock-out on the bottom

plate to the right of the refrigeration drive.

Material losses

Ensure the hose is not kinked. Route the hose with a

slope. The condensate must be able to drain freely.

Use a suitable condensate pump if there is insufﬁcient fall. Observe

the delivery head of the building.

If using a condensate pump, ensure that it is designed to deliver

at least 6l/min.

Outdoor installation

 Route the hose downwards out of the appliance. The conden-

sate hose can also be routed out of the appliance to the right

through the knock-out in the side panel.

 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.

If required, you may install a ribbon heater on the condensate

hose. We recommend that you install a ribbon heater if the rout-

ing of the condensate hose means it is at risk of frost or is fully

exposed to the elements. The ribbon heater is switched on at a

temperature < 0°C.

 Observe the chapter "Electrical connection".

Indoor installation

 Route the condensate into a drain. For this, route the hose

through an opening in the ﬂoor plate and frame (see chapter

"Installation / Siting and connecting the appliance / Indoor

installation"), and route it out of the appliance to the right by

removing the knock-out in the bottom of the side panel.

In the following diagram the position of the knock-out for the

condensate hose can be seen.

26_03_01_1686_

10.8 Second heat generator

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

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

10.9 Checking fans

Incorrect transport can slightly shift the fan, resulting in the fan

impeller dragging on the inlet nozzle.

If required, move the fan retainer to the left or to the right in its

slots.

The height can be adjusted by a corresponding rearrangement

of the spacer brackets from the top to the bottom of the retainer

or vice-versa.

26_03_01_0662

1 Fan bracket

2 Fan

3 Spacer brackets

11. Power supply

Note

Please observe the heat pump manager operating and

installation instructions.

The connection must only be carried out by a qualiﬁed contractor

and in accordance with these instructions.

Permission to connect the appliance may need to be obtained from

your local power supply utility.

11.1 Control panel

WARNING Electrocution

Before working on the appliance, isolate it from the

power supply at the control panel.

Terminals are located inside the appliance control panel and be-

come accessible by removing the front panel.

 Observe the information in chapters "Preparations / Electrical

installation", "Installation / Outdoor installation" and "Instal-

lation / Indoor installation".

 Remove the control panel from the casing.

 Use appropriate electrical cables in accordance with local

regulations.

 Check the function of the strain relief ﬁttings.

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

in accordance with the technical guides.

www.stiebel-eltron.com WPL 33 | 15

INSTALLATION

Power supply

Terminals 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 undershoots the dual mode point, the

electric emergency/booster heater safeguards both

the heating operation and the delivery of high DHW

temperatures.

Emergency mode

Should the heat pump suffer a fault that prevents its

continued operation, the heating output will be cov-

ered by the electric emergency/booster heater.

Heat-up program

(only for underfloor

heating systems)

Where return temperatures are <25°C, the electric

emergency/booster heater must provide the necessary

heat for screed drying.

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.

When the heat-up program has ended, 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 operation 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.

Plombendraht

durch die

Schraubenköpfe

58907/1-2/10.84

26_03_01_0672

X3 Compressor power supply (HP)

L1, L2, L3, N, PE

X3 Electric emergency/booster heater power supply

(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

Material losses

The compressors 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.

Material losses

When connecting the electric emergency/booster heat-

er (DHC), a ﬂow sensor must be connected to the heat

pump manager and installed close to the heat pump at

the heating ﬂow.

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

bles have been connected.

Connections X4, X2: Control unit and low voltage

Note

Provide common fuses/MCBs for the control cable of the

appliance and the heat pump manager.

D0000057829

X4 Control voltage (controller)

Power supply: L, N, PE

Control inputs:

Heat source 2 (HS 2)

External control, e.g. stand-alone mode (ext. contr.)

X2 Low voltage (LV)

BUS High H

BUS Low L

BUS earth

BUS " + " (not required)

16 |WPL 33 www.stiebel-eltron.com

INSTALLATION

Fitting casing components

12. Fitting casing components

12.1 Outdoor installation

26_03_01_0929_

1 Side panel

2 Cover

3 Front panel

4 Type plate

5 Back panel

26_03_01_1738

1 Bevelled edge

2 Control panel

3 Screw

 Position the cover on the appliance. Ensure that the bevelled

edge of the appliance cover is on the same side as the control

panel.

 Secure the cover with two screws.

 Hook the side panels, front panel and back panel into the

hooks on the standard appliance. Secure the casing sections

at the bottom with one screw each.

 Afﬁx the type plate supplied in a highly visible position on

one of the casing panels of the appliance.

12.2 Indoor installation

12.2.1 Sealing the appliance

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

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

appliance.

www.stiebel-eltron.com WPL 33 | 17

INSTALLATION

Fitting casing components

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 standard

appliance.

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

12.2.2 Fitting casing components

26_03_01_1443

1 Side panel

2 Cover

3 Front panel

4 Type plate

5 Back panel

 Place the hood on the appliance and secure with two screws.

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

standard appliance. Secure each of these with one screw.

 Afﬁx the type plate supplied to top front r.h. or l.h. side of the

side panel where it will be clearly visible.

18 |WPL 33 www.stiebel-eltron.com

INSTALLATION

Fitting casing components

12.3 Routing air hoses

Note

In the case of heat pumps installed indoors, if a blow-

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

apertures which are purposely provided in the building

envelope 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.

Note

Air hoses guide the intake air to the appliance and route

the discharge air from the appliance outdoors. They are

highly ﬂexible, thermally insulated and self-extinguishing

in case of ﬁre.

12.3.1 General information

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

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

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

exceed 8m.

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

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

the hose.

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

with wire cutters.

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

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

the connectors on the cover and the hose connection panels

or wall outlets.

12.3.2 Fitting air hoses

26_03_01_1446

 Firstly, push the outer hose slightly upwards.

26_03_01_1447

 Push the inner hose halfway down the connector.

26_03_01_1448

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

fabric tape provided.

26_03_01_1449

 Place the sealing strip provided around the connector.

26_03_01_1450

 Pull the outer hose over the connector.

www.stiebel-eltron.com WPL 33 | 19

INSTALLATION

Commissioning

26_03_01_1452

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

12.3.3 Insulating the brickwork

Ensure that no cold bridges form between the brickwork and the

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

condensation forming in the brickwork.

 If necessary, ﬁt suitable insulation between the brickwork

and the hose connection panels or wall outlets.

13. Commissioning

A qualiﬁed contractor must commission the appliance, make all

settings at the commissioning level of the heat pump manager,

and instruct the user.

Commission in accordance with these installation instructions

and the operating and installation instructions of the heat pump

manager. Our customer support can assist with commissioning,

which is a chargeable service.

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

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

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

ising body (in Germany, for example, this is the TÜV).

13.1 Checks before commissioning the heat pump

manager

Material losses

Observe the maximum system temperature in underﬂoor

heating systems.

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

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

heat pump is open.

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

turn sensor are correctly placed and connected.

 Check whether further sensors are correctly positioned and

connected.

 Check whether the power supply is connected correctly.

13.1.1 High limit safety cut-out

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

high limit safety cut-out of the electric emergency/booster heater

may trip.

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

26_03_01_1900

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.

13.2 Commissioning the heat pump manager

Commission the heat pump manager and make all settings in

accordance with the operating and installation instructions for

the heat pump manager.

20 |WPL 33 www.stiebel-eltron.com

INSTALLATION

Commissioning

13.3 Initial start-up

13.3.1 DIP switch (WP-Typ) on the IWS

(integral heat pump control unit)

 Open the control panel.

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

26_03_01_0921_

1 LEDs

2 DIP switch (WP-Typ)

3 Reset button

4 DIP switch (BA)

DIP switch (WP-Typ)

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

relevant heat pump type.

Factory setting:

Compressor mode with electric emergency/booster heater

WP - Typ

1 2 3 4

D0000057056

 Check whether the DIP switch is set correctly.

Compressor mode with external second heat generator

Material losses

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

er heater.

If the appliance is operated in dual mode with an external second

heat source or as a module with a further WPL, set the DIP switch

as follows:

WP - Typ

1 2 3 4

D0000057057

DIP switch (BA)

These DIP switches have no function.

13.4 Settings

13.4.1 Heating curve adjustment

The efﬁciency of a heat pump decreases as the ﬂow temperature

rises. The heating curve should therefore be adjusted with care.

Heating curves that are set too high cause the zone valves and

thermostatic valves to close, which may lead to the minimum ﬂow

rate required for the heating circuit not being achieved.

 Observe the WPM operating and installation instructions.

The following steps will help you to adjust the heating curve cor-

rectly:

- Fully open thermostatic or zone valves in a lead room (e.g.

living room and bathroom).

We do not recommend installing thermostatic or zone valves

in the lead room. Control the temperature for these rooms

via remote control.

- At different outside temperatures (e.g. –10°C and +10°C),

adjust the heating curve so the required temperature is set in

the lead room.

Standard values to begin with:

Parameter

Underfloor heating system

Radiator heating system

Heating curve 0.4 0.8

Control response time

10 10

Comfort temperature

20°C 20°C

If the room temperature is not high enough in spring and autumn

(approx. 10 °C outside temperature), raise the "COMFORT TEM-

PERATURE" parameter in the heat pump manager menu under

"SETTINGS / HEATING / HEATING CIRCUIT".

Note

If no remote control is installed, raising the "COMFORT

TEMPERATURE" parameter leads to a parallel offset of

the heating curve.

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STIEBEL ELTRON WPL 33 Operation Instruction

Brand: STIEBEL ELTRON

Model: WPL 33

Category: Heat pumps

Type: Operation Instruction

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STIEBEL ELTRON WPL 33 Operation Instruction

STIEBEL ELTRON WPL 33 Operation Instruction

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