STIEBEL ELTRON WWK 222, WWK 222 H, WWK 302, WWK 302 H Operation And Installation Manual

OPERATION AND INSTALLATION

DHW heat pump

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

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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 ��5

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 �� 6

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 ��9

INSTALLATION

7. Safety �� 10

7.1 General safety instructions �� 10

7.2 Instructions, standards and regulations �� 10

8. Appliance description �� 10

8.1 Standard delivery �� 10

8.2 Required accessories ��10

8.3 Further accessories�� 10

8.4 Incorrect use �� 10

9. Preparations �� 10

9.1 Transport �� 10

9.2 Storage �� 11

9.3 Installation site �� 11

9.4 Siting the appliance �� 12

10. Installation �� 13

10.1 Water connection �� 13

10.2 Condensate drain �� 14

10.3 Power supply �� 14

10.4 Assembling the appliance �� 17

11. Commissioning �� 18

11.1 Initial start-up �� 18

11.2 Recommissioning �� 18

12. Shutdown �� 18

13. Troubleshooting �� 19

13.1 Resetting the safety pressure limiter �� 19

13.2 Resetting the high limit safety cut-out (only WWKH) �� 19

13.3 Motor overload relay �� 19

14. Maintenance �� 20

14.1 Removing the appliance cover �� 20

14.2 Removing the casing ring �� 20

14.3 Cleaning the evaporator �� 20

14.4 Draining the cylinder �� 21

14.5 Descaling the electric emergency/booster heater �� 21

14.6 Valves �� 21

14.7 Condensate drain �� 21

14.8 Replacing the power cable �� 21

14.9 Fitting the casing ring �� 21

14.10 Fitting the appliance cover �� 21

15. Speciﬁcation �� 22

15.1 Dimensions and connections �� 22

15.2 Wiring diagram �� 24

15.3 Data table �� 26

WARRANTY

ENVIRONMENT AND RECYCLING

ENGLISH

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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").

- The connection to the power supply must be in the form of a permanent connection. Ensure the appliance can 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 wiring rules. For Australia: Ensure that the appliance can be separated from the power supply by a suitable isolator. Contactors, circuit breakers or fuses can be used for this. This type of isolator must be installed in accordance with the wiring rules.

- 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").

- 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.

- 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 safety valve (cold water expansion control valve) 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 response pressure of the lowest pressure rated valve installed, otherwise a pressure reduction valve will be required. If this is the case, install a pressure reduction valve in the cold water feed. The pressure reducing valve must be set to 440kPa if a safety valve is installed; otherwise to 550kPa.

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

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

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

OPERATION

General information

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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.

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

Injury

Electrocution

Burns (burns, scalding)

1.1.3 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.

1.2 Other symbols in this documentation

Note

General information is identiﬁed by the adjacent symbol.

 Read these texts carefully.

Symbol Meaning

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

Appliance disposal

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

tion you need to take is described step by step.

1.3 Units of measurement

Note

All measurements are given in mm unless stated otherwise.

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.

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

Appliance description

ENGLISH

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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.

 Ensure you do not come into 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

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. To enable the impressed current anode to provide protection against corrosion, the power supply to the appliance must not be interrupted for more than 16 hours if the DHW cylinder is ﬁlled with water and the anode is not connected separately to a continuous power supply source. 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.

Neglecting to do this puts the appliance at risk of damage. Never use batteries that cannot be charged. Only nickel-metal hydride (Ni-MH) rechargeable batteries are permissible. 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

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. If the DHW cylinder is empty, safety equipment switches off the appliance.

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.

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.

 If water continues to drip when heating is complet-

ed, inform your qualiﬁed contractor.

2.3 Test symbols

See type plate on the appliance.

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 DHW depend on the temperature of the air drawn in. When the air inlet temperature drops, the appliance 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 the selected set temperature. The appliance heats up the water to a temperature which is selected at the factory.

OPERATION

Appliance description

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In the case of indoor installation, the air inside the installation room can be cooled by 1°C to 3°C through 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.

When a hot water draw-off point is opened, the hot DHW is pushed out of the appliance by the inﬂow of cold water.

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 an 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

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 over the entire cylinder height. The integral sensor determines the average cylinder temperature.

The appliance control unit uses the average cylinder temperature captured by the integral sensor. DHW heating is started when the average cylinder temperature has fallen 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 disables the compressor operation. 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 disabled and the compressor continues to run. A solenoid valve routes the hot gas directly to the evaporator. While this is happening, the condenser is disabled by another solenoid valve.

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

Note

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

3.3.2 Ambient temperatures above the application limit

3.4 Frost protection

The appliance activates the frost protection function if the integral sensor in the DHW cylinder captures a temperature below 10°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 18°C.

OPERATION

Settings

ENGLISH

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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. To enable the impressed current anode to provide protection against corrosion, the power supply to the appliance must not be interrupted for more than 16 hours if the DHW cylinder is ﬁlled with water and the annode is not connected separately to a continuous power supply source. 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 make use of solar power generated on site.

The appliance has a second set temperature preselected at the factory. This is activated in the event of an external switching signal. Set temperature2 takes priority over the standard set temperature while there is an external switching signal.

Following a one-off activation (signal is present for at least 1minute), set temperature2 applies for at least 20minutes and is ranked higher than set temperature1.

The qualiﬁed contractor can use software to change set temperature2 with an accessory available from us.

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 mains at the MCB/fuse in

the fuse box.

 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

Care and maintenance t ips

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

abrasive or corrosive cleaning agents.

Air intake grille/ air discharge grille

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.

DHW cylinder

The DHW cylinder is equipped with a maintenance-free impressed current anode to safeguard it against corrosion. The power supply must not be interrupted for more than 16 hours while the DHW cylinder is filled with water to enable the impressed current anode to provide protection against corrosion.

Electric emergency/booster heater

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

Safety equipment

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

Evaporator Have the evaporator checked regularly by a qualified contrac-

tor.

Condensate drain

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

OPERATION

Cleaning, care and maintenance

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Protective anode and battery replacement

The appliance is equipped with a maintenance-free, impressed current anode that protects the tank from corrosion while it is supplied with power. 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 may be interrupted for up to 16 hours.

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

Material losses

Never use batteries that cannot be charged. Only rechargeable batteries are permissible. Batteries may be damaged in the appliance. Without a power supply, the impressed current anode and the cylinder would not be protected against corrosion.

The rechargeable batteries are secured at the back of the fascia.

D0000040621

 Undo the screw securing the fascia.  Carefully remove the fascia so that the cables running from

the batteries to the impressed current anode in the appliance are not pulled out.

D0000051618

1 Plug-in connection

 Undo the plug-in connection by pressing the connection lock

on both sides.

D0000051617

1 Battery compartment

 Pull the battery compartment down to remove it from the

retainer.

 Open the battery compartment using a screwdriver.  Replace the batteries (NiMH, type AAA, ≥800mAh).

Material losses

Make sure that the batteries are properly inserted the right way round, because otherwise there will be no corrosion protection in the event of interruptions in the power supply.

 Close the battery compartment using a screwdriver.  Push the battery compartment into the retainer.  Reconnect it to the appliance with the plug-in connection.

OPERATION

Troubleshooting

ENGLISH

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6. Troubleshooting

Problem Cause

 Remedy

No hot water is available.

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

nected to the power supply.

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

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.

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

Check the air intake grille and air discharge grille for contamination. Remove any contamination (see chapter "Maintenance and care").

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

No action required. The appliance will then restart the compressor automatically.

The DHW cylinder is not completely full.

The appliance restarts automatically when the DHW cylinder has been filled.

Due to a previous high demand for hot water, the unit has not had the chance to fully recover.

No action required. Allow the unit to continue operating normally until the heating cycle is completed.

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

Notify a qualified contractor who will reset the safety pressure limiter.

A safety valve is dripping.

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

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

The condensate drain drips.

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

This is expected and no action is required. The amount of condensate depends on the air humidity level.

For indoor installations the room temperature drops too low.

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

D0000035352

1 Number on the type plate

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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 pipe adapters G1 to G3/4 (use subject to type of installation, see chapter "Preparations/ Siting the appliance/ Minimum clearances") comprising a ﬂanged pipe, a gasket and a union nut

- 2 135° pipe adapters G1 to G3/4 union nut (use subject to type of installation, see chapter "Preparations/ Siting the appliance/ Minimum clearances")

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.

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").

9. Preparations

9.1 Transpor t

CAUTION Injury

 Observe the weight of the appliance.  Use suitable transport aids (e.g. a pallet 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 pallet trolley. Pad the contact surfaces to avoid damaging the appliance. Secure the appliance to the pallet trolley 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 pallet trolley and the foot of the appliance.

Vehicular transport

Material losses

The appliance must generally be stored and transported vertically.

A transport lock ﬁtted at the factory to the refrigerant circuit area inside the appliance enables relatively short transportation horizontally over a maximum distance of 160km of paved roads. Strong shocks are not permissible.

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.

+ 22 hidden pages

STIEBEL ELTRON WWK 222, WWK 222 H, WWK 302, WWK 302 H Operation And Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual