Stiebel Eltron WWK302H Installation Manual

OPERATION AND INSTALLAT ION

DHW heat pump

» WWK222 » WWK222H » WWK302 » WWK302H

CONTENTS

SPECIAL INFORMATION

OPERATION

1. General information ��4

1.1 Safety instructions �� 4

1.2 Other symbols in this documentation �� 4

1.3 Units of measurement �� 4

2. Safety �� 4

2.1 Intended use �� 4

2.2 General safety instructions �� 4

2.3 Test symbols �� 5

3. Appliance description ��6

3.1 Heat pump operating principle �� 6

3.2 DHW heating �� 6

3.3 Appliance operation outside the application limits �� 6

3.4 Frost protection �� 7

3.5 Minimum runtime and minimum pause time �� 7

3.6 Connection of an external signal transmitter �� 7

4. Settings ��7

5. Cleaning, care and maintenance ��7

6. Troubleshooting ��8

INSTALLATION

7. Safety �� 9

7.1 General safety instructions �� 9

7.2 Instructions, standards and regulations �� 9

8. Appliance description ��9

8.1 Standard delivery �� 9

8.2 Required accessories �� 9

8.3 Further accessories�� 9

8.4 Incorrect use �� 9

9. Preparations �� 9

9.1 Transport �� 9

9.2 Storage �� 10

9.3 Installation site �� 10

9.4 Siting the appliance �� 11

10. Installation �� 12

10.1 Water connection �� 12

10.2 Condensate drain �� 13

10.3 Power supply �� 13

10.4 Assembling the appliance �� 16

11. Commissioning �� 16

11.1 Initial start-up �� 16

11.2 Recommissioning �� 16

12. Shutdown �� 16

13. Troubleshooting �� 17

13.1 Resetting the safety pressure limiter �� 17

13.2 WWK222H/ WWK 302H: Resetting the high limit safety cut-out �� 17

13.3 Motor overload relay �� 17

14. Maintenance �� 18

14.1 Removing the appliance cover �� 18

14.2 Removing the casing ring �� 18

14.3 Cleaning the evaporator �� 18

14.4 Draining the cylinder �� 19

14.5 Descaling the electric emergency/booster heater �� 19

14.6 Valves �� 19

14.7 Condensate drain �� 19

14.8 Replacing the power cable �� 19

14.9 Fitting the casing ring �� 19

14.10 Protective anode and battery change �� 19

14.11 Fitting the appliance cover �� 20

15. Speciﬁcation �� 21

15.1 Dimensions and connections �� 21

15.2 Wiring diagram �� 23

15.3 Data table �� 24

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 experience and know-how, provided that they are supervised or they have been instructed on how to use the appliance safely and have understood the resulting risks. Children must never play with the appliance. Children must never clean the appliance or perform user maintenance unless they are supervised.

- Observe all applicable national and regional regulations and instructions.

- Observe the minimum clearances (see chapter "Installation/ Preparations/ Siting the appliance").

- Observe the requirements concerning the installation room (see "Speciﬁcation/ Data table").

- Activate any valves at least once every 6months to prevent blockages, e.g. by limescale deposits.

- Drain the appliance as described in "Installation/ Maintenance and cleaning/ Draining the cylinder".

- A T&P valve or a cold water expansion control valve, or both, must be installed. Observe all applicable national and regional regulations and instructions.

- The maximum pressure in the cold water supply line must be at least 20% below the lowest response pressure of all installed safety valves. Otherwise a pressure reducing valve is required. If this is the case, install a pressure reducing valve in the cold water supply line. The pressure reducing valve must be set to 540kPa if a safety valve is installed; otherwise to 700kPa.

- Fit the drain pipe of the safety valve with a constant downward slope and in a room free from the risk of frost.

ENGLISH

- The appliance is supplied with a ﬂexible power cable without plug. In the case of a permanent connection, 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. Contactors, circuit breakers or fuses can be used for this. This type of isolator must be installed in the ﬁxed electrical installation according to the regulations. For Australia: Ensure that the appliance can be separated from the power supply by a suitable isolator. Contactors, circuit breakers, fuses or general purpose electrical wiring plugs can be used for this. The type of isolator must be installed according to the electrical installation regulations.

- Observe the safety measures to prevent contact with dangerous 'live' currents.

- Observe the MCB/fuse protection required for the appliance (see chapter "Speciﬁcation/ Data table").

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

- The safety valve drainage aperture must remain open to atmosphere.

- If the power cable is faulty, replace it with a new one. The power cable must only be replaced (for example if damaged) by a qualiﬁed contractor.

- The appliance is pressurised. During the heat-up process, expansion water will drip from the safety valve.

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OPERATION

General information

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 appliance and retain them for future reference. Pass on the instructions to any new user where appropriate.

Symbol Meaning

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

tion you need to take is described step by step.

Material losses (appliance damage, consequential losses and environmental pollution)

Appliance disposal

1.3 Units of measurement

Note

All measurements are given in mm unless stated otherwise.

1.1 Safety instructions

1.1.1 Structure of safety instructions

KEYWORD Type of risk

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

 Steps to prevent the risk are listed.

1.1.2 Symbols, type of risk

Symbol Type of risk

1.1.3 Keywords

KEYWORD Meaning

DANGER Failure to observe this information will result in serious

WARNING Failure to observe this information may result in serious

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

Injury

Electrocution

Burns (burns, scalding)

injury or death.

ous or minor injury.

2. Safety

2.1 Intended use

The purpose of this appliance is to heat domestic hot water within the application limits stated in the chapter "Speciﬁcation / data table".

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

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

2.2 General safety instructions

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

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, provided that they are supervised or they have been instructed on how to use the appliance safely and have understood the resulting risks. Children must never play with the appliance. Children must never clean the appliance or perform user maintenance unless they are supervised.

1.2 Other symbols in this documentation

Note

General information is identiﬁed by the adjacent symbol.

 Read these texts carefully.

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WARNING Electrocution Contact with live components presents a threat to life. Damage to the cable insulation or to individual components may result in a risk to life.

 If there is damage to the insulation, switch off the

power supply and arrange a repair. All work on the electrical installation must be carried out by a qualiﬁed contractor.

OPERATION

Safety

WARNING Burns The water in the DHW cylinder can be heated to temperatures in excess of 60°C. There is a risk of scalding at outlet temperatures in excess of 43 °C.

 Caution must be exercised when coming in contact

with the water when discharged.

WARNING Burns Touching hot components can lead to burns.

 When working on hot components, always wear

protective working clothing and safety gloves. The pipework connected to the DHW outlet of the appliance can reach temperatures in excess of 60°C.

WARNING Burns The appliance is ﬁlled with refrigerant at the factory. In the event of refrigerant escaping due to a leak, avoid coming into contact with the refrigerant or inhaling the released vapours. Ventilate the rooms affected.

WARNING Electrocution Never operate the appliance when the casing is open or without a cover.

CAUTION Injury

If objects are left on the appliance, noise emissions may increase due to resulting vibrations, and the objects could fall and cause injury.

 Never place any objects on top of the appliance.

Material losses

Ensure that the appliance, the water pipes and safety valves are free from any risk of frost. If you disconnect the appliance from the power supply, it is no longer protected against frost.

Material losses

Never cover the appliance. Covering the air intake or air discharge leads to a reduced air supply. If the air supply is restricted, the operational reliability of the appliance cannot be guaranteed.

Material losses

Only operate the appliance when the DHW cylinder has been ﬁlled. The appliance is equipped with boil-dry protection to prevent operation if the hot water cylinder is not completely full of water.

Material losses

Heating liquids other than potable water is not permitted.

Material losses

Keep the appliance installation site free from air contaminated with oil or salt (chloride) and corrosive or explosive substances. Avoid contaminating the installation site with dust, hairspray or substances containing chlorine or ammonia.

ENGLISH

Material losses

At the factory, the appliance is ﬁtted with rechargeable batteries that ensure the power supply to the impressed current anode in the case of a power failure. In order that the impressed current anode can protect the appliance hot water cylinder against corrosion, the appliance must not be disconnected from the power supply for more than 16hours if the hot water cylinder is ﬁlled with water and the impressed current anode is not separately connected to a continuous power supply. If regular interruptions to the power supply are not anticipated, the batteries will require no maintenance. Replace the rechargeable batteries for the impressed current anode every three years in the following cases:

- The impressed current anode is not connected separately to a continuous power supply source and a switching contact regularly interrupts the power supply to the appliance.

- The security of supply is inadequate.

Failure to observe this point puts the appliance at risk of damage. Never use batteries that cannot be recharged. Only rechargeable nickel metal hydride batteries (NiMH) are permitted. Batteries may be damaged in the appliance. Without a power supply, the impressed current anode and the cylinder would not be protected against corrosion.

Material losses

Operating the appliance outside the application limits (see "Speciﬁcation/ Data table") is not permitted. The appliance may be damaged if operated continuously outside the application limits.

Note

The appliance is pressurised. During the heat-up process, expansion water will drip from the safety valve.

 Notify a qualiﬁed contractor if water continues to

drip after heat-up has been completed.

2.3 Test symbols

See type plate on the appliance.

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OPERATION

Appliance description

3. Appliance description

This appliance enables DHW to be supplied efﬁciently to several draw-off points using renewable energy. The appliance extracts heat from the ambient air. This heat is used to heat up the water in the DHW cylinder with added electric power. The amount of electrical energy and time required to heat up the hot water depend on the temperature of the air drawn in and the temperature of the water in the cylinder. When the air intake temperature drops, the appliance heating output is reduced and the heat-up time is extended.

Subject to the power supply and user draw-off behaviour, the water is heated automatically to a temperature that is set at the factory.

In the case of indoor installation, the air inside the installation room can be cooled by 1°C to 3°C due to heat extraction. The appliance also extracts moisture from the air, which turns into condensate. The condensate is removed from the appliance via the condensate drain.

The heat pump drive unit is located in the upper section of the appliance. The DHW cylinder is located in the lower section of the appliance. To protect against corrosion, the DHW cylinder is coated internally with special enamel and is additionally equipped with a non-sacriﬁcial impressed current anode.

3.1 Heat pump operating principle

A closed circuit within the appliance contains refrigerant (see "Speciﬁcation/ Data table"). This refrigerant evaporates at low temperatures. In the evaporator, which extracts heat from the air drawn in, the refrigerant changes from a liquid into a gaseous state. A compressor draws in the gaseous refrigerant and compresses it. This increase in pressure raises the refrigerant temperature. That requires electrical energy.

The energy (motor heat) is not lost, but reaches the downstream condenser together with the compressed refrigerant. There, the refrigerant transfers heat to the DHW cylinder. An expansion valve then reduces the still prevalent pressure and the cyclical process starts again.

3.2 DHW heating

The appliance control unit uses the average cylinder temperature captured by the integral sensor. DHW heating is started when the average cylinder temperature falls below the set temperature.

DHW is normally heated by the heat pump of the appliance (see chapter "Speciﬁcation/ Data table").

Note

If the appliance has been isolated from the power supply during operation, the compressor will only restart after the pressure inside the refrigerant circuit has been equalised. Pressure compensation can take several minutes.

WWK222H|WWK302H: Electric emergency/booster heater

When the temperature in the upper section of the DHW cylinder drops 10K below the selected set temperature, the appliance automatically switches on the electric emergency/booster heater. When the temperature in the upper section of the DHW cylinder rises 2K above the selected set temperature, the appliance switches off the electric emergency/booster heater.

3.3 Appliance operation outside the application limits

3.3.1 Ambient temperatures below the application limit

Outside the application limits, the appliance blocks the compressor from operating. This could lead to reduced DHW convenience. If the appliance has an electric emergency/booster heater, this will be enabled if a demand for heating up the water exists and the lower application limit is underrun.

Low ambient temperatures may result in the formation of hoar frost on the evaporator depending on the air humidity and water temperature.

Active defrost feature

The appliance is equipped with active hot gas defrosting, which allows quick defrosting of the evaporator when needed. During defrosting, the appliance fan is deactivated. The compressor continues to run. A solenoid valve routes the hot gas directly to the evaporator. While this is happening, refrigerant ﬂow to the condenser is disabled by another solenoid valve.

In contrast to conventional defrosting methods, the appliance guarantees that defrosting takes place only when needed.

D0000050335

1 Cylinder top sensor 2 Integral sensor

The appliance is equipped with two temperature sensors.

- The cylinder top sensor captures the water temperature in the upper section of the cylinder.

- The integral sensor is a temperature sensor afﬁxed all the way down the cylinder. The integral sensor determines the average cylinder temperature.

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3.3.2 Ambient temperatures above the application limit

Outside the application limits, the appliance blocks the compressor from operating.This could lead to reduced DHW convenience. If the appliance has an electric emergency/booster heater, this will be enabled if a demand for heating up the water exists and the upper application limit has been exceeded.

Note

Heat-up times are longer while the evaporator is defrosting.

OPERATION

Settings

3.4 Frost protection

The appliance activates the frost protection function if the integral sensor in the DHW cylinder captures a temperature below 8°C. The appliance then heats the water by means of the heat pump and the electric emergency/booster heater. The heat pump and electric emergency/booster heater switch off when the temperature captured by the integral sensor reaches 16°C.

3.5 Minimum runtime and minimum pause time

Material losses

When operating with external switching devices that can interrupt the power supply to the appliance, such as time switches, energy management systems or home automation systems, observe the following conditions:

- The minimum ON time is 60 minutes.

- The minimum pause time following a shutdown is 20 minutes.

- The appliance should not be switched on/off more than 10 times per day.

- The breaking capacity of the switching element must meet the fuse rating requirements (see chapter “Speciﬁcation/ Data table”).

Material losses

If you disconnect the appliance from the power supply, it is no longer protected against frost.

Material losses

At the factory, the appliance is ﬁtted with rechargeable batteries that ensure power supply to the impressed current anode in the case of a power failure. In order that the impressed current anode can protect the appliance hot water cylinder against corrosion, the appliance must not be disconnected from the power supply for more than 16hours if the hot water cylinder is ﬁlled with water and the impressed current anode is not separately connected to a continuous power supply. If regular interruptions to the power supply are not anticipated, the batteries will require no maintenance. Every three years, you must replace the batteries for the impressed current anode in the following cases:

- The impressed current anode is not connected separately to a continuous power supply source and a switching contact regularly interrupts the power supply to the appliance.

- The security of supply is inadequate.

3.6 Connection of an external signal transmitter

Note

This type of connection must only be carried out by a qualiﬁed electrician.

External signal transmitters can be integrated via the built-in contact input, e.g. a PV system to take advantage of eletricity generated on site.

4. Settings

Adjustments are not necessary. The DHW temperature has been set at the factory.

Emergency shutdown

In the event of an emergency, carry out the following steps:

 Disconnect the appliance from the power supply at the MCB/

fuse in the domestic distribution board or by unplugging from a general purpose outlet.

 Shut off the cold water supply.

5. Cleaning, care and maintenance

WARNING Electrocution

- Only clean the exterior of the appliance.

- Never open the appliance.

- Do not insert objects through the grills into the inte-

rior of the appliance.

- Never spray the appliance with water.

- Never spray water into the appliance.

WARNING Injury

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

Appliance components

Casing Use a damp cloth to clean the casing sections. Never use

Air intake grille/ air discharge grille

DHW cylinder

Electric emergency/booster heater

Safety equipment

Evaporator Have the evaporator checked regularly by a qualified contrac-

Condensate drain

Care and maintenance t ips

abrasive or corrosive cleaning agents. Clean the air intake grille and air discharge grille every six

months. Cobwebs or other kinds of contamination could obstruct the air supply to the appliance.

The DHW cylinder is equipped with a maintenance-free impressed current anode to safeguard it against corrosion. In order that the impressed current anode can protect the appliance DHW cylinder against corrosion, the appliance must not be disconnected from the power supply for more than 16hours if the DHW cylinder is filled with water and the impressed current anode is not separately connected to a continuous power supply.

Have the electric emergency/booster heater descaled from time to time. This will ex tend the service life of the electric emergency/booster heater.

Activate any valves at least once every 6months to prevent blockages, e.g. by limescale deposits.

tor. Undo the condensate drain. Check that the condensate drain

is clear and remove any dirt from the condensate drain connection.

ENGLISH

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OPERATION

Troubleshooting

Protective anode and battery replacement

The appliance is equipped with a maintenance-free impressed current anode that protects the cylinder from corrosion when it is connected to the power supply. At the factory, the appliance is ﬁtted with rechargeable batteries that ensure the power supply to the impressed current anode in the case of a power failure. The power supply to the appliance must not be interrupted for more than 16hours..

If the power supply is regularly interrupted by a switching contact or the security of supply is inadequate, the rechargeable batteries of the impressed current anode must be replaced every three years. Neglecting to do this puts the appliance at risk of damage. Notify a qualiﬁed contractor.

If regular interruptions in the power supply are not anticipated and there is security of supply, no maintenance of the batteries is required and the appliance is maintenance-free in this regard.

6. Troubleshooting

Problem Cause

No hot water is available.

The compressor is operational, but the fan is off.

A safety valve is dripping.

The condensate drain drips.

No power at the appliance. Check that the appliance is con-

A fuse/MCB in the fuse box has blown/responded.

The air intake or air discharge of the appliance is blocked.

Outside the application limits, the appliance blocks the compressor. This could lead to reduced DHW convenience.

The DHW cylinder is not completely filled.

After hot water was drawn off previously, the appliance was not able to fully heat up the cylinder content.

The safety pressure limiter has responded 5 times in 5hours.

If the appliance is in defrost mode, it may take up to an hour for the fan to switch on again.

These units are under water mains pressure. During the heat-up process, expansion water will drip from a safety valve.

The surface temperature of the evaporator is lower than the dew point temperature of the ambient air. Condensate forms.

 Remedy

nected to the power supply.

Check whether the fuses/MCBs in your fuse box have blown/ responded. Contact a qualified contractor if the fuse blows or the MCB responds again after the appliance is connected to the power supply.

Check the air intake grille and air discharge grille for contamination. Remove any contamination (see chapter "Maintenance and care"). Ensure that the supply and extract air flow are unimpeded.

No action required. The appliance automatically restarts the compressor within the application limits.

The appliance restar ts automatically when the DHW cylinder has been filled.

No action required. Let the appliance complete the heat-up process.

Notify a qualified contractor. The appliance can only be unlocked with a service programming unit.

No action required. However, if this continues for more than one hour, please consult your licensed plumber or service department.

If water continues to drip when heating is completed, please inform your qualified contractor.

This is normal. No action required. The amount of condensate depends on the humidity level of the ambient air.

Problem Cause

For indoor installations the room temperature drops too low.

 Remedy

Operation of the appliance can cause the room temperature to fall by 1 to 3°C. If the room temperature falls by more than 5°C, check the room size (see chapter "Specification/Data table"). Increasing the room size by opening a door to another room will remedy this.

Notifying a qualiﬁed contractor

If you cannot remedy the fault, notify your qualiﬁed contractor. In Australia direct notify us (1800153351). To facilitate and speed up your request, provide the number from the type plate (0000000000-000000). The type plate can be found on the left, above the DHW outlet connection.

Sample type plate

000000-0000-000000

1 Number on the type plate

D0000035352

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INSTALLATION

Safety

INSTALLATION

7. Safety

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

7.1 General safety instructions

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

Take note of the appliance type plate and chapter "Speciﬁcation".

8. Appliance description

The heat pump drive unit is located in the upper section of the appliance. The DHW cylinder is located in the lower section of the appliance.

8.1 Standard delivery

The following are delivered with the appliance:

- Condensate drain bend

- 2 straight G1 to G3/4 pipe adaptors

- T&P valve G1/2

- Reducer from R 3/4 male thread to G 1/2 female thread

9. Preparations

9.1 Transport

CAUTION Injury

 Observe the weight of the appliance.  Use suitable transport aids (e.g. sack truck, hand

trolley) and enough personnel for transportation.

Material losses

The appliance has a high centre of gravity and low overturning moment.

 Safeguard the appliance against falling over.  Only set the appliance down on an even base.

Material losses

The appliance casing is not designed to withstand strong forces. Incorrect handling can lead to material losses of considerable extent.

 Observe the information on the packaging.

Only remove the packaging shortly before the installation.

Where possible, do not unpack the appliance until it has arrived in the installation room.

For transport and handling leave the appliance in its packaging and on the pallet. This enables brief horizontal transport and provides places to hold on to during transport.

If the appliance has to be unpacked before transportation, we recommend using a hand trolley. Pad the contact surfaces to avoid damaging the appliance. Secure the appliance using a strap. Pad between the strap and the appliance and avoid overtightening the strap. Where stair wells are narrow, you can carry the appliance by the handles on the sack truck or trolley and the foot of the appliance.

Vehicular transport

ENGLISH

8.2 Required accessories

Various safety assemblies are available that need to be selected subject to the static pressure. These type-tested safety assemblies protect the appliance against unacceptable excess pressure.

For Australia: Various safety assemblies are available to protect the appliance against impermissible excess pressure and limit the output delivery temperature.

On tarmac, asphalt, bitumen or otherwise paved roads you may transport the appliance horizontally over a maximum distance of 160km. Strong shocks are not permissible.

8.3 Further accessories

- Condensate pump (if the condensate cannot be drained off with a naturally occurring fall)

8.4 Incorrect use

The following are not permitted:

- Operating the appliance when the casing is open

- Filling the appliance with a refrigerant other than the one detailed in chapter "Speciﬁcation/ Data table"

- Heating liquids other than potable water

Observe the list of requirements regarding the installation room and non-permissible installation sites (see chapter "Installation site").

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Material losses

The appliance must generally be stored and transported vertically.

Material losses

If transported horizontally, the appliance must always be laid on the shaded side of the box. The appliance must not remain in a horizontal position for more than 24hours. If the appliance was transported horizontally, leave it to rest in a vertical position for at least one hour before commissioning.

 Observe the information on the packaging.

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