STIEBEL ELTRON WPL 33 HT S Operation and Installation

OperatiOn and installatiOn

air|Water Heat pump

» Wpl 33 Ht

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CONTENTS | OPERATION

OPERATION

1. General information ��3

1.1 Document information �� 3

1.2 Further applicable documents �� 3

1.3 Safety instructions �� 3

1.4 Other symbols in this documentation �� 3

1.5 Units of measurement �� 3

2. Safety �� 4

2.1 Intended use �� 4

2.2 General safety instructions �� 4

2.3 CE designation �� 4

2.4 Instructions, standards and regulations �� 4

3. Appliance description ��4

3.1 Function �� 4

4. Settings ��5

5. Maintenance and care ��5

6. Troubleshooting ��5

6.1 Other problems �� 5

INSTALLATION

7. Safety �� 6

7.1 General safety instructions �� 6

7.2 Instructions, standards and regulations �� 6

8. Appliance description ��6

8.1 Standard delivery �� 6

8.2 Accessories �� 6

8.3 Buffer cylinder �� 6

9. Preparations ��6

9.1 Sound emissions �� 6

9.2 Preparation of the installation site �� 7

9.3 Electrical installation�� 9

10. Installation ��9

10.1 Handling �� 9

10.2 External installation �� 9

10.3 Internal installation �� 10

10.4 Heating water connection �� 10

10.5 Condensate drain �� 11

10.6 Second heat source�� 11

10.7 Electrical connection �� 11

10.8 Casing components �� 14

10.9 Routing air hoses �� 15

10.10 Fitting air hoses �� 16

10.11 Insulating the wall outlets �� 16

11. Commissioning �� 17

11.1 Checks before commissioning�� 17

11.2 Commissioning �� 18

12. Taking the appliance out of use �� 19

12.1 Standby �� 19

12.2 Power interruption �� 19

13. Troubleshooting �� 19

13.1 Elements on the IWS III HT�� 19

13.2 Cleaning the condensate drain �� 20

13.3 Resetting the high limit safety cut-out �� 20

13.4 Sicherheits-Temperaturbegrenzer zurücksetzen �� 20

14. Maintenance �� 21

15. Speciﬁcation �� 22

15.1 Wiring diagram (3-phase version) �� 22

15.2 Wiring diagram (1-phase version) �� 24

15.3 Connections and dimensions �� 27

15.4 Data table �� 29

16. Output diagrams �� 31

16.1 Heating output �� 31

16.2 Power consumption �� 32

16.3 Coefﬁcient of performance �� 32

17. Commissioning report �� 33

GUARANTEE

ENVIRONMENT AND RECYCLING

OPERATION

GENERAL INFORMATION

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OPERATION

1. General information

1.1 Document information

The chapter entitled “Operation” is intended for appliance users

and qualiﬁed contractor.

The chapter entitled “Installation” is intended for qualiﬁed con-

tractor.

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.

1.2 Further applicable documents

Note

Please observe the operating and installation instructions

of system components.

1.3 Safety instructions

1.3.1 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.

1.3.2 Symbols, type of risk

Read the text next to these symbols carefully.

Symbol Type of risk

!

Injury

Electrocution

Fire

1.3.3 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.

1.4 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 the environment

Appliance disposal

Never cover the appliance

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

tion you need to take is described step by step.

1.5 Units of measurement

Note

All measurements are given in mm unless stated oth-

erwise.

OPERATION

SAFETY

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2. Safety

Only qualiﬁed contractor 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.

!

DANGER Injury

Where children or persons with limited physical, sensory

or mental abilities are allowed to control this appliance,

ensure that this will only happen under supervision or

after appropriate instruction by a person responsible for

their safety.

Children must be supervised to ensure that they never

play with the appliance.

2.3 CE designation

The CE designation shows that the appliance meets all essential

requirements according to the:

- Electrical Compatibility Directive (2004/108/EC)

- Low Voltage Directive (2006/95/EC)

- Pressure Equipment Directive (97/23/EC)

2.4 Instructions, standards and regulations

Note

Observe all applicable national and regional regulations

and instructions.

3. Appliance description

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

heat pump. Heat is extracted from the outside 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 emergency/booster

heater (DHC). In mono mode, the electric emergency/booster

heater is activated when the dual mode point can no longer be

maintained, in order to safeguard heating operation and to pro-

vide high DHW temperatures. In such cases, the electric emer-

gency/booster heater is activated in mono energetic operation as

a booster heater.

Further operational characteristics:

- Suitable for underﬂoor and radiator heating

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

temperature

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

sheet steel plus powder-coated ﬁnish.

- Comprises all components required for operation and all

safety equipment.

- Filled with non-combustible safety refrigerant

Note

To control the heating system, you will need the heat

pump manager “WPM 2.1”.

3.1 Function

Heat is extracted from the outside 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. 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.

OPERATION

SETTINGS

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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 2.1

and does not required any special operator actions.

 Observe the heat pump manager operating and installation

instructions.

5. Maintenance and care

!

Damage to the appliance and the environment

Maintenance work, such as checking the electrical safety,

must only be carried out by a qualiﬁed contractor.

A damp cloth is sufﬁcient for cleaning all plastic and sheet 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 the environment

Keep the air discharge and intake apertures free from

snow and leaves.

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).

6. Troubleshooting

Fault Cause

 Remedy

There is no hot water or

the heating system stays

cold.

One or more fuses/MCBs

are faulty.

Check the fuse/MCBs in

your fuse box/distribu-

tion panel.

Water collects below the

appliance.

The condensate drain

may be blocked.

Call a qualified contrac-

tor to have the conden-

sate drain cleaned out.

6.1 Other problems

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 on the front

at the 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�1564

1

1 Number on the type plate

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INSTALLATION

SAFETY

INSTALLATION

7. Safety

7.1 General safety instructions

- Only qualiﬁed contractor should carry out installation, com-

missioning, maintenance and repair of the appliance.

- We guarantee trouble-free operation and operational reli-

ability only if the original accessories and spare parts intend-

ed for the appliance are used.

7.2 Instructions, standards and regulations

Observe all applicable national and regional regula-

tions 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.

8.1 Standard delivery

The following are delivered with the appliance:

- Type plate

8.2 Accessories

8.2.1 Required accessories

You require the following accessories to operate the heat pump:

Description

Heat pump manager 2.1 (WPMS 2.1 or WPMW 2.1)

Remote adjuster for central heating system

Buffer cylinder

Contact sensor

Immersion sensor

Accessory for external installation WPL 33 HT

Accessory for internal installation WPL 33 HT

8.3 Buffer cylinder

A buffer cylinder is absolutely essential to ensure trouble-free

appliance operation. The buffer cylinder is not only installed as a

hydraulic separator for volume ﬂow in the heat pump circuit and

the heating circuit, but primarily as an energy source for defrost-

ing the evaporator.

9. Preparations

9.1 Sound emissions

9.1.1 Sound emissions for external installation

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

than on the enclosed sides. Please therefore observe the informa-

tion below.

For the sound power level, see chapter “Speciﬁcation/Data table”.

 Ensure that the air intake direction is the same as 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).

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

this, observe the minimum clearances in the following diagram:

≥500

≥1000

≥500

≥700

D0000019241

 Noise can also be reduced through closely spaced palisade

fencing if this is installed around the appliance. For this, ob-

serve the minimum clearances in the previous diagram.

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

ﬂoors).

 Avoid installation between reﬂective building walls. Reﬂect-

ing 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.

For this, also observe the chapter “Installation/Siting”.

9.1.2 Acoustic emissions for internal installation

For the sound power level, see chapter “Speciﬁcation/Data table”.

Never install the appliance directly below or next to living rooms

or bedrooms.

Never install the heat pump on joists.

 Isolate the installation surface. See chapter “Preparation of

the installation location for internal installation”.

 Connect the heating ﬂow and return via ﬂexible pressure

hoses. Suitable pressure hoses can be found in the accesso-

ries chapter.

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

tion insulation.

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

nal walls towards neighbouring windows or living rooms/

bedrooms.

 Observe the minimum clearances in the following diagram:

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INSTALLATION

PREPARATIONS

≥500

≥1000

D0000019242

9.2 Preparation of the installation site

9.2.1 General information

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

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

 Observe all minimum clearances in chapter “Preparations/

Sound emissions”.

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

substrate. Uneven substrates can increase noise emissions.

9.2.2 Preparation of the installation site for external

installation

 Please observe the chapter “Sound emissions for external

siting”.

Example: Foundations with recess

4

1

2

3

1390

270

50150

800

70

D0000023464

1 Air discharge

2 Air intake

3 Main wind direction

4 Supply line outlet

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INSTALLATION

PREPARATIONS

Example: Installation on foundations

26�03�01�1554

1

3

4

5

7

6

8

2

1 Heating circuit ﬂow

2 Main power cable

3 Heating circuit return

4 Conduit for supply lines

5 Electric cables

6 Drainage pipe

7 Gravel bed

8 Foundation

 Only use weather-resistant cables.

 Protect the ﬂow and return pipes 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 hose, observe chapter “In-

stallation / condensate drain”.

9.2.3 Preparation of the installation site for internal

installation

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

 Isolate the installation surface.

1 2 3 4

26�03�01�1466

1 Concrete base

2 Impact sound insulation

3 Floating screed

4 Recess

See chapter “Speciﬁcation/Connections and dimensions” for the

position and dimensions of the air intake and discharge apertures,

and the outlets for the water pipes and electrical cables in the

appliance cover.

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INSTALLATION

9.3 Electrical installation

DANGER Risk of electrocution!

Carry out all electrical connection and installation work

in accordance with national and regional regulations.

DANGER Risk of 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, circuit breakers, fuses etc.

!

Risk of damage

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 protec-

tion

Assignment Cable cross-section

C 32 A

C 50 A

Heat pump (3-

phase)

Heat pump (1-

phase)

10.0 mm²

16.0 mm²

B 16 A

Electric emer-

gency/booster

heater (DHC)

(3-phase)

2.5 mm²

C 35 A

Electric emer-

gency/booster

heater (DHC)

(1-phase)

6.0 mm² for routing through a wall

4.0 mm² when routing multi-core cables

on a wall or in an electrical conduit on

a wall

B 16 A Control 1.5 mm²

The electrical speciﬁcations are provided in the “Data table”. You

require aJ-Y(St)2x2x0.8mm² cable for the BUS.

Note

Provide separate fuses for the 3 power circuits for the

appliance, the control and the electric emergency/booster

heater.

10. Installation

10.1 Handling

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

porting the appliance.

The centre of gravity is in the area where the compressors are

located.

 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 External installation

 Pay attention to the air discharge direction.

 Position the standard unit on the prepared substrate.

!

Risk of damage

Observe the torque of the ﬂow meter (see chapter “Spec-

iﬁcation/Data table”) when carrying out the following

procedure.

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

(components from “Accessories for external installation”).

26�03�01�1555

1

2

3

4

5

1 Heating ﬂow

2 Heating return

3 Flow meter

4 Supply line outlet

5 Condensate hose

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

from below through the knock-outs in the base.

Note

Only ﬁt the casing components when the electrical and

hydraulic connections have been made.

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INSTALLATION

10.3 Internal installation

 Position the standard unit on the prepared substrate.

!

Risk of damage

Observe the torque of the ﬂow meter (see chapter “Spec-

iﬁcation/Data table”) when carrying out the following

procedure.

 Remove the knock-out at the top in the appliance cover

panel.

1

2

3

4

26�03�01�1685�

1 Connector

2 Union nut

3 Pipe bend for heating circuit return

4 Condensate drain hose

 Undo the union nut from the heating ﬂow.

 Turn the connector through approx. 45°.

 Retighten the union nut.

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

nent from “Accessories for internal installation”).

 Route the condensate hose to the right out of the appliance.

5 4 36

21

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 water pipes inwards through the hood.

 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 supply for

the appliance, control cable and BUS cable.

10.4 Heating water connection

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

installed by a qualiﬁed contractor in accordance with the water

installation drawings which are part of the technical guides.

 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.

10.4.1 Oxygen diffusion

!

Risk of damage

In underﬂoor heating systems with plastic pipes that are

permeable to oxygen, avoid open vented heating systems

or steel pipework.

With permeable plastic underﬂoor heating system pipes or open

vented heating systems, oxygen diffusion can cause corrosion of

steel components if steel radiators or steel pipes are used.

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

heat pump condenser and result in a lower output by reducing

the cross-section, or in a shutdown being activated by the high

pressure switch.

10.4.2 Filling the heating system

Water quality

In order to prevent damage caused by scale formation, observe

the following when ﬁlling the system with heating water:

The total water hardness must be <1°dH(0.18 mmol/l alkaline

earths).

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INSTALLATION

If the above conditions cannot be met, soften the water.

!

Damage to the appliance and the environment

Fully desalinated water or rainwater must not be used,

as this leads to increased corrosion. Suitable appliances

for softening, as well as the ﬁlling and ﬂushing of heat-

ing systems, can be hired from our customer service or

obtained via trade suppliers. You can also use our water

softener ﬁtting HZEA.

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.

1

26�03�01�1690�

1 Air vent valve

10.4.3 Heat meter

!

Risk of damage

For the installation of a heat meter, observe that most

heat meters cause a substantial pressure drop, therefore

choose a larger circulation pump.

10.5 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.

!

Damage to the appliance and the environment

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

slope.

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

the delivery head of the building.

External 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 inside 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 chapter on electrical connection.

Internal installation

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

through an opening in the ﬂoor plate and frame, 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�

10.6 Second heat source

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

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

10.7 Electrical connection

10.7.1 General

Please observe the heat pump manager operating and installation

instructions.

Only qualiﬁed electricians must carry out the installation in ac-

cordance with these instructions.

Permission to connect the appliance may need to be obtained from

your local power supply utility.

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INSTALLATION

10.7.2 Cable routing for external installation

26�03�01�1559

 Route the electric cables along the right-hand support.

 Secure the cables with cable ties using the holes provided in

the support.

10.7.3 Cable routing for internal installation

26�03�01�1688�

10.7.4 Making the electrical connections

 Observe chapter “Preparing the electrical installation”.

26�03�01�1563

1

1 Connecting chamber

 Connect the three power circuits (for the appliance, the elec-

tric emergency/booster heater and the control) in accordance

with the following diagrams.

1-phase appliance

X3 Power supply (heat pump, compressor)

L1, N, PE

X5 DHC (electric emergency/booster heater)

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

X4 Control cable terminal

L, N, PE

Control inputs:

DHC (electric emergency/booster heater)

X9 Terminal, ribbon heater

Control output: L, N, PE

X2 LV terminal

H BUS high

L BUS low

BUS ground

3-phase appliance

X3 Power supply (heat pump, compressor)

L1, L2, L3, N, PE

X5 DHC (electric emergency/booster heater)

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

X4 Control cable terminal

L, N, PE

Control inputs:

DHC (electric emergency/booster heater)

X9 Terminal, ribbon heater

Control output: L, N, PE

X2 LV terminal

H BUS high

L BUS low

BUS ground

“ + “ BUS “+“ (is not connected)

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INSTALLATION

1-phase appliance

26�03�01�1556

3-phase appliance

26�03�01�1562

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INSTALLATION

10.8 Casing components

10.8.1 Fitting the casing sections for external installation

2

1

3

1

5

4

26�03�01�0929

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.

10.8.2 Fitting casing parts for internal installation

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

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

26�03�01�1692�

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

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

is supplied with the „air hose“ accessories.

26�03�01�1693�

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

on the appliance.

26�03�01�1694�

 Remove the backing from the adhesive tape on the frame and

on the plastic sheets.

 Secure the foils by pressing them onto the standard appli-

ance. Seal the apertures around the hooks using adhesive

strips with slits. The adhesive strips with slits are supplied

with the casing parts.

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INSTALLATION

10.8.3 Fitting casing components

1

5

2

3

4

26�03�01�1689�

1 Cover

2 Front panel

3 L.h. side panel

4 Back panel

5 R.h. side panel, with cut-out in the insulation

 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.

10.9 Routing air hoses

The air hose can be extended by twisting the coils into each other.

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 approximately every 1 m. This prevents

the hose from sagging because of its ﬂexibility.

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

at the hood 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

!

Damage to the appliance and the environment

Always cover the external apertures with wire grilles.

Secure the hoses against slippage.

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INSTALLATION

10.10 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 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.

26�03�01�1452

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

26�03�01�1453

10.11 Insulating the wall outlets

Prevent cold bridges forming between the wall outlets to be in-

stalled on site and the brickwork. To prevent condensation form-

ing in the brickwork, insert suitable insulation between the wall

outlets and the brickwork.

As an alternative, you can also use the insulated wall outlet AWG

560. Wall outlet AWG 560 is available as an accessory.

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INSTALLATION

COMMISSIONING

11. Commissioning

A WPM2.1 heat pump manager is required to operate the appli-

ance. All necessary adjustments prior to and during operation are

made on this device.

Only qualiﬁed contractors may carry out the adjustments on the

heat pump manager commissioning list, commission the appliance

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 your local authorising

body.

After commissioning, complete the commissioning report that is

part of these instructions.

11.1 Checks before commissioning

Before commissioning, check the following points:

11.1.1 Heating system

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

and opened the quick-acting air vent valve?

11.1.2 Temperature sensor

- Have you correctly placed and connected the outside tem-

perature sensor and the external return temperature sensor

(in conjunction with a buffer cylinder)?

11.1.3 High limit safety cut-out

At ambient temperatures below -15°C it may happen that the

high limit safety cut-out triggers the emergency/booster heater.

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

26�03�01�1565

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.

11.1.4 Power supply

- Have you correctly connected the power supply?

18 | WPL 33 HT WWW.STIEBEL-ELTRON.COM

INSTALLATION

COMMISSIONING

11.2 Commissioning

11.2.1 DIP switch (heat pump type) on the IWS III HT

Open the control panel by proceeding as follows:

 Undo the screws,

 lift the cover,

 and remove the cover towards the front.

26�03�01�1557

Checking the settings on the IWS III

BA

26�03�01�1691�

1

4

3 2

1 LED

2 Reset button

3 DIP switch (WP-Typ [heat pump type])

4 DIP switch (BA [operating mode])

DIP switch (WP-Typ [heat pump type])

Different types of heat pump are selected with the DIP switch (WP-

Typ). Subject to the heat pump type, the appliance was factory-set

for two compressors with an electric emergency/booster heater

(DHC).

 Check whether the DIP switch (WP-Typ) is set correctly.

Two compressors with an electric emergency/booster heater

(DHC):

WP-Typ

26�03�01�1513

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

ternal second heat source or as module with a further WPL, set

the DIP switch as follows:

Two compressors with external heat source 2:

26�03�01�1514

In this case, do not connect the electric emergency/booster heater

(DHC).

DIP switch (BA [operating mode])

 Check whether the DIP switch(BA) is set correctly.

BA

26�03�01�1515

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INSTALLATION

TAKING THE APPLIANCE OUT OF USE

12. Taking the appliance out of use

!

Damage to the appliance and the environment

Never interrupt the heat pump power supply, even out-

side the heating season. Otherwise, system frost protec-

tion is not guaranteed.

The heat pump manager automatically switches the heat

pump to summer or winter mode.

12.1 Standby

To take the appliance out of use, simply set the heat pump man-

ager to “Standby mode”. That way the safety functions that protect

the system and frost protection remain enabled.

12.2 Power interruption

If the system is permanently isolated from the power supply,

please observe the following:

!

Damage to the appliance and the environment

If the heat pump and frost protection are completely

switched off, drain the system on the water side.

13. Troubleshooting

Note

Please observe the heat pump manager operating and

installation instructions.

Note

The following inspection instructions may only be carried

out by a qualiﬁed contractor.

If you are unable to identify this fault with the heat pump manager,

check the elements on the IWS III HT.

Open the control panel by proceeding as follows:

 Undo the screws,

 lift the cover,

 and remove the cover towards the front.

26�03�01�1557

 Read the following sections on troubleshooting and carry out

the instructions.

13.1 Elements on the IWS III HT

The IWS III HT (integral heat pump controller III) helps you to

troubleshoot if the fault cannot be identiﬁed using the WPM 2.1.

BA

26�03�01�1691�

1

4

3 2

1 LED

2 Reset button

3 DIP switch (WP-Typ [heat pump type])

4 DIP switch (BA [operating mode])

13.1.1 Checking the “WP-Typ” DIP switch on the IWSIIIHT

 Check whether the “WP-Typ”DIP switch (3) is set as follows:

With an electric emergency/booster heater (DHC)

WP-Typ

26�03�01�1513

Single compressor with external HS 2.

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

heat source, set the DIP switch as follows:

26�03�01�1439

In this case the power supply for the electric emergency/booster

heater (DHC) must not be connected.

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INSTALLATION

TROUBLESHOOTING

13.1.2 Checking the “BA” DIP switch on the IWS III HT

 Check whether the “BA” DIP switch (4) is set as follows:

BA

26�03�01�1436

13.1.3 LED (1)

Red LED

Fault Cause » Remedy

Appliance stops and

restarts after the idle

period has expired. Red

LED flashes.

Heat pump fault.

Check the fault mes-

sage in the WPM. Find

the solution in the WPM

instructions (fault list).

Perform a reset of the

IWS (see WPM instruc-

tions).

Appliance stops perma-

nently. Red LED illumi-

nates.

Five faults within two

hours compressor runt-

ime.

Check the fault mes-

sage in the WPM. Find

the solution in the WPM

instructions (fault list).

Perform a reset of the

IWS (see WPM instruc-

tions).

Green LED centre

The LED ﬂashes during initialisation, and illuminates constantly

after the BUS address has been assigned successfully. Only then

is communication with WPM2.1 established.

13.1.4 Reset button

If the IWS was incorrectly initialised, the settings can be reset with

this button. For this also observe the chapter “Reinitialising IWS”

in the heat pump manager operating and installation instructions.

13.2 Cleaning the condensate drain

Environmental conditions may result in the condensate drain be-

coming blocked. To clean the drain, proceed as follows:

DANGER Risk of electrocution!

Before removing the casing components, disconnect all

poles from the power supply.

 Remove the casing parts

(see chapter “Installation”).

 Check the hose and the pipe of the condensate drain.

 Remove dirt and blockages immediately.

 Reﬁt the casing parts on the appliance.

(see chapter “Installation”).

13.3 Resetting the high limit safety cut-out

The electric emergency/booster heater (DHC) stops if the heating

water temperature exceeds 85 °C on account of a low ﬂow rate.

 Remove the cause of the fault.

 Reset the high limit safety cut-out. For this, press the button

shown:

26�03�01�1565

1

1 High limit safety cut-out reset button

13.4 Resetting the high limit safety cut-out

If the heating water temperature exceeds 85°C, the electric emer-

gency/booster heater shuts down.

 Remove the cause of the fault.

26�03�01�1565

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 but-

ton. If necessary, use a pointed object to do so.

 Check whether the heating water is being circulated at a suf-

ﬁcient ﬂow rate.

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STIEBEL ELTRON WPL 33 HT S Operation and Installation

STIEBEL ELTRON WPL 33 HT S Operation and Installation

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