STIEBEL ELTRON DHE 18 AU, DHE 27 AU Operation And Installation

OPERATION AND INSTALLATION

Instantaneous water heater with full electronic control

» DHE 18 AU » DHE 27 AU

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CONTENTS | SPECIAL INFORMATION

SPECIAL INFORMATION

OPERATION

1. General information ��3

1.1 Safety instructions �� 3

1.2 Other symbols in this documentation �� 3

1.3 Units of measurement �� 3

2. Safety �� 3

2.1 Intended use �� 3

2.2 General safety instructions �� 3

2.3 CE designation �� 4

2.4 Test symbols �� 4

3. Appliance description �� 4

4. Settings and displays �� 5

4.1 User interface �� 5

4.2 Setting the temperature �� 5

4.3 Following an interruption of the water supply �� 5

4.4 Economy monitor selection �� 6

4.5 Appliance settings �� 6

5. Cleaning, care and maintenance ��8

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

9. Preparations �� 9

9.1 Installation site �� 9

10. Installation �� 10

10.1 Standard installation �� 10

10.2 Completing the installation �� 12

10.3 Installation options �� 13

11. Commissioning �� 15

11.1 Initial start-up �� 15

11.2 Recommissioning �� 15

12. Service mode �� 15

13. Shutting down the system �� 16

14. Troubleshooting �� 16

15. Maintenance �� 18

16. Speciﬁcation �� 18

16.1 Dimensions and connections �� 18

16.2 Wiring diagram �� 19

16.3 DHW output �� 19

16.4 Application areas / conversion table �� 19

16.5 Pressure drop �� 19

16.6 Fault conditions �� 20

16.7 Data table �� 20

WARRANTY | ENVIRONMENT AND RECYCLING

SPECIAL INFORMATION

- The appliance may be used by children aged 8 and up 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.

- Ensure the appliance can be separated from the power supply by an isolator that disconnects all poles with at least 3mm contact separation.

- Secure the appliance as described in chapter "Installation/ Installation".

- Observe the maximum permissible pressure (see chapter "Speciﬁcation/ Data table").

- Drain the appliance as described in chapter "Installation/ Maintenance/ Draining the appliance".

OPERATION

General information

ENGLISH

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OPERATION

1. General information

The chapter "Operation" is intended for appliance users 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 a new user if required.

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 or 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

Notes are bordered by horizontal lines above and below the text. General information is identiﬁed by the symbol shown on the left.

 Read these texts carefully.

Symbol

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

Unless speciﬁed otherwise, all dimensions are given in mm.

2. Safety

2.1 Intended use

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.

This pressurised appliance is suitable for heating domestic hot water or for reheating preheated water. The appliance can supply one or more draw-off points.

2.2 General safety instructions

CAUTION Burns During operation, the tap can reach temperatures in excess of 60 °C. There is a risk of scalding at outlet temperatures in excess of 43 °C.

WARNING Injury The appliance may be used by children aged 8 and up 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.

OPERATION

Appliance description

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Where children or persons with limited physical, sensory or mental abilities are allowed to use this appliance, we recommend a permanent temperature limit. The limit can be set by you or a qualiﬁed contractor:

- Childprooﬁng adjustable by the user

- Anti-scalding protection adjustable by the qualiﬁed contractor

Material losses

Protect the appliance and its tap against frost.

2.3 CE designation

The CE designation shows that the appliance meets all essential requirements according to the:

- Low Voltage Directive

- Electromagnetic Compatibility Directive The maximum permissible mains impedance is indicated in chapter "Speciﬁcation".

2.4 Test symbols

See type plate on the appliance

Information for Australia/New Zealand:

Installation complies with standard AS/NZS 3500.4.

3. Appliance description

This appliance with full electronic control and output matching keeps the outlet temperature constant. The water is heated by the electronic control unit with motorised valve to precisely the selected temperature. This occurs regardless of the inlet temperature.

DHW temperature

The DHW outlet temperature can be variably adjusted. The selected temperature is displayed.

Heating system

The bare wire heating system has a pressure-tested copper casing. The heating system is suitable for hard and soft water areas; it has low susceptibility to scale build-up. This system ensures rapid and efﬁcient DHW availability.

Note

The appliance is equipped with an air detector that largely prevents damage to the heating system. If, during operation, air is drawn into the appliance, the heater shuts down automatically for one minute, thereby protecting the heating system.

Display backlighting

The display features two-tone backlighting (green/ amber).

Efﬁciency display

Green ECO backlighting indicates that the appliance is operating in a particularly economical way

- when the output is less than 80%

- when the maximum output is less than 80% while the inlet temperature is higher than 35°C

- when the maximum output is less than 80% while the ECO function is switched on

Under all other operating conditions, the backlighting is amber.

Economy monitor

The appliance has an economy monitor. This is activated by pressing the appropriate key. Advertisements:

- Energy savings*

- Water savings*

- CO

savings*

- Energy consumption

- Water consumption

* Compared to hydraulic instantaneous water heaters. Calculation for a 3-person household with individual DHW requirements and usable energy requirements subject to VDI 2067. Electricity and water costs can be programmed individually.

OPERATION

Settings and displays

ENGLISH

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4. Settings and displays

4.1 User interface

D0000033114

1 Temperature selector 2 Scalding risk LED 3 Memory key 4 Menu key 5 Additional value display 6 Heating output display 7 Temperature display 8 Service symbol 9 Fault symbol 10 Economy monitor information key

When the appliance is delivered the backlighting is set so that the screen is illuminated automatically as soon as you operate the selector or a key, or the appliance heats. If the selector or a key is not pressed or the appliance does not heat for 30seconds, the backlighting switches off. You can also set the illumination to be on constantly.

Display symbols

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1 2 3 4 5 6

1 Wellness shower programs 2 Automatic water volume control 3 ECO 4 Childprooﬁng 5 Additional value display 6 Time

4.2 Setting the temperature

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1 Temperature setting 20 - 60°C in steps of 0.5°C,

OFF = heating system switched off 2 Programmed temperature selection 3 Economy monitor selection

You can store a preferred temperature with memory key M.

 Select a preferred temperature.  Press the M key for 2 seconds. The temperature display ﬂash-

es once to conﬁrm.

Inlet temperature information

If the inlet temperature is higher than the preferred temperature, e.g. if water has been preheated by solar energy, then the temperature display ﬂashes and the second display indicates the inlet temperature. No further heating of the water occurs.

D0000033113

1 Temperature display ﬂashes 2 Inlet temperature display 3 Scalding risk LED; red LED when the temperature setting >

43 °C

Recommended setting for operation with a thermostatic valve

Set the temperature at the appliance to 60°C.

4.3 Following an interruption of the water supply

Material losses

Following an interruption of the water supply the appliance must be recommissioned by carrying out the following steps, in order to prevent the destruction of the bare wire heating system.

 Disconnect the appliance from the power supply by

removing the fuses/tripping the MCBs.

 Open the tap for one minute until the appliance and

its upstream cold water inlet line are free of air.

 Switch the mains power back ON again.

OPERATION

Settings and displays

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4.4 Economy monitor selection

Example menu structure with currency in euros (Eur)

2 sec.

Reset

2 sec.

Reset

2 sec.

Reset

2 sec.

Reset

2 sec.

Reset

2 sec. /

time-out 10 sec.

D0000032904

1 Energy saving

The energy saving in euros (Eur) in comparison to hydraulic instantaneous water heaters is calculated and displayed.

2 Water saving

The water saving in euros (Eur) in comparison to hydraulic instantaneous water heaters is calculated and displayed.

3 CO2 emissions

The CO2 saving in kg in comparison to hydraulic instantaneous water heaters is calculated and displayed.

4 Amount of energy

The amount of energy consumed in kWh is displayed.

5 Water consumption

The amount of water consumed in m³ is displayed.

4.5 Appliance settings

Key to symbol s

Press once START menu Press once Change menu

Hold for 2seconds END

Change settings/ scanning

Menu structure

Eur

Eur 0_00...9999 €/kWh

cur 0_00...9999 cur/kWh

Eur 0_00...9999 €/m³

cur 0_00...9999 €/m³

cur

OFF | 20 - 60 °C

OFF | 4 - 15 l/min

OFF | 1 | 2 | 3 | 4

OFF | 5 - 200 l

l/min

12:00

00:00 - 23:59

Auto

bernstein/amber

grün/green

OFF

l/min

Auto

100 %

2 sec. /

time-out 30 sec.

CO2

0...2000 g/kWh

0,22 cur/kWh

5,00 cur/m³

553 g/kWh

0,22 €/kWh

5,00 €/m³

D0000032902

OPERATION

Settings and displays

ENGLISH

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1 ECO water and energy saving function

The ECO function enables you to limit the ﬂow rate to a maximum value. ECO on = symbol on user interface

ECO off = no symbol on user interface

2 Childprooﬁng

Childprooﬁng allows you as a user to limit the adjustable temperature at the appliance to a maximum value. In service mode, your qualiﬁed contractor can also set a temperature for anti-scalding protection (see chapter "Service mode"). This temperature then acts as the upper limit of the setting range for childprooﬁng.

3 Wellness shower programs

The Wellness shower program lets you choose from 4 different shower programs. WW = domestic hot water, KW = cold water A Cold prevention

To strengthen the body, we recommend you ﬁnish off with a cold shower; this will trigger a reﬂex in the body to warm

up.

3 min

B Winter pick-me-up

An invigorating end to a winter shower with a ﬁnal warm-

up.

- 10°C

3 min

10 sec

C Summer ﬁtness program

The quick contrast shower to increase ﬁtness with a ﬁnal warm-up.

3 min

10 sec

D Circulation program

Shower your arms and legs with cold water to boost circulation. Spray from the hands and feet towards the body. You can then repeat this process with warm

water.

3 min

20 sec

30 sec

4 Automatic water volume control

The automatic water volume control allows you to limit the volume of water at a high ﬂow rate. When the selected volume of water is reached, the control automatically reduces the ﬂow rate. The preferred water temperature is maintained. The automatic water volume control must be enabled on each occasion prior to ﬁlling the bath. Example of ﬁlling a bath with 80 litres: When the bath has been ﬁlled with 80 litres, the control automatically reduces the ﬂow rate to 4 l/min.

5 Flow rate

You have the option of displaying the ﬂow rate or the time.

6 Setting the time

You have the option of displaying the time or the ﬂow rate. You can set a time from 00:00 h to 23:59 h. You will need to set the time again following a power interruption.

7 Adjusting the backlighting

You are able to adjust the display backlighting. If you select "Auto" the illumination will ﬂash during the setting process.

- The backlighting switches on whenever the appliance heats and with any operation of the user interface.

- If there is no operation for 30seconds the backlighting switches off.

- If you select "On" the backlighting will remain on constantly.

8 Adjusting the green/amber brightness

You can adjust the brightness of both backlighting colours individually.

9 Selecting the currency

Here you can select the currency you wish to display for the energy and water saving: Eur = €

cur = any other currency

10 Setting the electricity tariff

Here you can enter your particular electricity tariff in Eur/kWh or cur/kWh in order to calculate the energy saving.

11 Setting the water tariff

Here you can enter your particular water tariff in €/m³ or cur/m³ in order to calculate the water saving.

12 Setting the CO2 emissions value

The factory default for the CO2 emissions calculation is 553 g CO2⁄kWh (source: "Reducing energy consumption and CO2 emissions through electrical domestic hot water supply", 2011). You can also set your own CO2 emissions value if required.

13 Resetting to factory defaults

 Press keys M and i simultaneously for 2 seconds.

The default settings can be found in the dashed box in the diagram.

14 Menüpunkt

This parameter is not relevant to this version of the appliance. It is not possible to adjust any settings.

15 Menüpunkt

This parameter is not relevant to this version of the appliance. It is not possible to adjust any settings.

OPERATION

Cleaning, care and maintenance

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5. Cleaning, care and maintenance

 Never use abrasive or corrosive cleaning agents. A damp

cloth is sufﬁcient for cleaning the appliance.

 Check the taps regularly. Limescale deposits at the spouts

can be removed using commercially available descaling agents.

6. Troubleshooting

Fault Cause Remedy

The appliance will not start despite the DHW valve being fully open.

There is no mains voltage.

Check the fuse/MCB in your fuse box/distribution panel.

The aerator in the tap or the shower head is scaled up or contaminated.

Clean and/or descale the aerator or shower head.

The water supply has been interrupted.

Vent the appliance and the cold water inlet line (see chapter "Commissioning/ Restarting").

Cold water flows briefly while hot water is being drawn.

The air sensor detects air in the water and briefly switches the heater off.

The appliance restarts automatically after 1minute.

Temperatures >43°C.

Dynamic anti-scalding protection is activated.

Dynamic anti-scalding protection automatically ceases 2minutes after draw-off has ended.

If you cannot remedy the fault, notify your qualiﬁed contractor. To facilitate and speed up your enquiry, please provide the serial number from the type plate (000000-0000-000000):

No.: 000000-0000-000000

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STIEBEL ELTRON DHE 18 AU, DHE 27 AU Operation And Installation

Specifications and Main Features

Frequently Asked Questions

User Manual