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OPERATION AND INSTALLATION
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
13.2WWK 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
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 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").
-- 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 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.
-- 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.
ENGLISH
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WWK 222-302 H | 3 |
OPERATION
General information
OPERATION |
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1. General information |
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Meaning
Material losses
(appliance damage, consequential losses and environmental pollution)
Appliance disposal
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.
ffThis symbol indicates that you have to do something. The action you need to take is described step by step.
1.3Units of measurement
Note
All measurements are given in mm unless stated otherwise.
1.1Safety 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. ffSteps to prevent the risk are listed.
1.1.2 Symbols, type of risk
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Electrocution |
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injury or death. |
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WARNING |
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injury or death. |
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ous or minor injury. |
1.2Other symbols in this documentation
Note
General information is identified by the adjacent symbol. ffRead these texts carefully.
2.Safety
2.1Intended 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-do- mestic environment, e.g. in a small business, as long as it is used in the same way.
Any other use beyond that described shall be deemed inappropriate. Observation of these instructions and of instructions for any accessories used is also part of the correct use of this appliance.
2.2General 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.
fIfthere 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.
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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.
ffCaution must be exercised when coming in contact with the water when discharged.
WARNING Burns
Touching hot components can lead to burns. ffWhen 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.
ffNever 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.
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 sep-
arately 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.
!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.
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.Material losses
Note
The appliance is pressurised. During the heat-up process, expansion water will drip from the safety valve. fNotify a qualified contractor if water continues to
drip after heat-up has been completed.
2.3Test symbols
See type plate on the appliance.
ENGLISH
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WWK 222-302 H | 5 |
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.
3.1Heat 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.
3.2DHW heating
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D0000050335
1Cylinder top sensor
2Integral 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.
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.
3.3Appliance 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.
Note
Heat-up times are longer while the evaporator is defrosting.
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.
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OPERATION
Settings
3.4Frost 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.
3.5Minimum runtime and minimum pause time
!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.
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
3.6Connection of an external signal transmitter
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This type of connection must only be carried out by a |
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External signal transmitters can be integrated via the built-in |
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contact input, e.g. a PV system to take advantage of eletricity |
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generated on site. |
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4. |
Settings |
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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:
ffDisconnect the appliance from the power supply at the MCB/ fuse in the domestic distribution board or by unplugging from a general purpose outlet.
ffShut off the cold water supply.
5.Cleaning, care and maintenance
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Only clean the exterior of the appliance. |
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Never open the appliance. |
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rior of the appliance. |
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Never spray the appliance with water. |
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Never spray water into the appliance. |
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WARNING Injury |
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Maintenance work, such as checking electrical safety, |
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must only be carried out by a qualified contractor. |
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Appliance |
Care and maintenance tips |
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components |
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Casing |
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Use a damp cloth to clean the casing sections. Never use |
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abrasive or corrosive cleaning agents. |
Air intake grille / air discharge grille
DHW cylinder
Electric emergency/booster heater
Safety equipment
Evaporator
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 extend 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.
Have the evaporator checked regularly by a qualified contractor.
Condensate |
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Undo the condensate drain. Check that the condensate drain |
drain |
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is clear and remove any dirt from the condensate drain con- |
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nection. |
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WWK 222-302 H | 7 |
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 |
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No power at the appliance. |
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Check that the appliance is con- |
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is available. |
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nected to the power supply. |
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A fuse/MCB in the fuse box |
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Check whether the fuses/MCBs |
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has blown/responded. |
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in your fuse box have blown/ |
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responded. Contact a qualified |
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contractor if the fuse blows or |
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the MCB responds again after |
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the appliance is connected to the |
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power supply. |
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The air intake or air discharge Check the air intake grille and |
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of the appliance is blocked. |
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air discharge grille for contami- |
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nation. Remove any contamina- |
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tion (see chapter "Maintenance |
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and care"). Ensure that the |
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supply and extract air flow are |
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unimpeded. |
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Outside the application lim- |
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No action required. The appli- |
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its, the appliance blocks the |
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ance automatically restarts the |
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compressor. This could lead to compressor within the applica- |
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reduced DHW convenience. |
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tion limits. |
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The DHW cylinder is not com- |
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The appliance restarts automati- |
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pletely filled. |
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cally when the DHW cylinder has |
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been filled. |
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After hot water was drawn off No action required. Let the ap- |
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previously, the appliance was |
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pliance complete the heat-up |
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not able to fully heat up the |
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process. |
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cylinder content. |
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The safety pressure limiter |
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Notify a qualified contractor. The |
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has responded 5 times in |
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appliance can only be unlocked |
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5 hours. |
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with a service programming |
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unit. |
The compres- |
If the appliance is in defrost |
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No action required. However, |
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sor is opera- |
mode, it may take up to an |
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if this continues for more than |
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tional, but the |
hour for the fan to switch on |
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one hour, please consult your |
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fan is off. |
again. |
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licensed plumber or service de- |
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partment. |
A safety valve |
These units are under water |
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If water continues to drip when |
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is dripping. |
mains pressure. During the |
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heating is completed, please in- |
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heat-up process, expansion |
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form your qualified contractor. |
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water will drip from a safety |
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valve. |
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The conden- |
The surface temperature of |
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This is normal. No action re- |
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sate drain |
the evaporator is lower than |
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quired. The amount of conden- |
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drips. |
the dew point temperature of |
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sate depends on the humidity |
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the ambient air. Condensate |
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level of the ambient air. |
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forms. |
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Problem |
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Remedy |
For indoor in- |
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Operation of the appliance can |
stallations the |
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cause the room temperature to |
room temper- |
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fall by 1 to 3 °C. If the room tem- |
ature drops |
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perature falls by more than 5 °C, |
too low. |
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check the room size (see chapter |
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"Specification / Data table"). |
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Increasing the room size by |
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opening a door to another room |
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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 (000000- 0000-000000). The type plate can be found on the left, above the DHW outlet connection.
Sample type plate
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000000-0000-000000 |
D0000035352 |
1 Number on the type plate
8 | WWK 222-302 H |
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INSTALLATION
Safety
INSTALLATION |
9. |
Preparations |
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9.1 |
Transport |
7.Safety
Only a qualified contractor should carry out installation, commissioning, maintenance and repair of the appliance.
7.1General safety instructions
We guarantee trouble-free function and operational reliability only if original accessories and spare parts intended for the appliance are used.
CAUTION Injury
! ffObserve the weight of the appliance.
ffUse 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.
fSafeguard the appliance against falling over. ffOnly set the appliance down on an even base.
7.2Instructions, 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.
8.1Standard 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
8.2Required 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.
8.3Further accessories
-- Condensate pump (if the condensate cannot be drained off with a naturally occurring fall)
8.4Incorrect 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
!The appliance casing is not designed to withstand strong forces. Incorrect handling can lead to material losses of considerable extent.
ffObserve the information on the packaging. Only remove the packaging shortly before the installation.Material losses
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
!The appliance must generally be stored and transported vertically.Material losses
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.
!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.Material losses
ffObserve the information on the packaging.
Observe the list of requirements regarding the installation room and non-permissible installation sites (see chapter "Installation site").
ENGLISH
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WWK 222-302 H | 9 |
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