Stiebel Eltron DEL27AU, DEL18AU User Manual

OPERATION AND INSTALLATION

Electronically controlled instantaneous water heater

» DEL 18 AU » DEL 27 AU

Tmax

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 �� 4

2.1 Intended use �� 4

2.2 General safety instructions �� 4

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 Temperature limit (childprooﬁng) �� 5

4.3 Inlet temperature information �� 6

4.4 Following an interruption of the water supply �� 6

5. Cleaning, care and maintenance ��6

6. Troubleshooting ��6

INSTALLATION

7. Safety �� 7

7.1 General safety instructions �� 7

7.2 Instructions, standards and regulations �� 7

8. Appliance description ��7

8.1 Standard delivery �� 7

9. Preparations �� 7

9.1 Installation site �� 8

10. Installation ��8

10.1 Standard installation �� 8

10.2 Completing the installation �� 10

10.3 Installation options �� 11

11. Commissioning �� 13

11.1 Initial start-up �� 13

11.2 Recommissioning �� 14

12. Shutting down the system �� 14

13. Troubleshooting �� 14

13.1 Service mode �� 14

13.2 Indicator options for LED diagnostic trafﬁc light �� 15

13.3 Fault table �� 15

14. Maintenance �� 16

15. Speciﬁcation �� 16

15.1 Dimensions and connections �� 16

15.2 Wiring diagram �� 17

15.3 DHW output �� 17

15.4 Application areas/ conversion table �� 17

15.5 Pressure drop �� 17

15.6 Fault conditions �� 17

15.7 Data table �� 18

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".

WARRANTY | ENVIRONMENT AND RECYCLING

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OPERATION

ENGLISH

General information

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.

1.2 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

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

tion you need to take is described step by step.

and environmental pollution)

Appliance disposal

1.3 Units of measurement

Note

Unless speciﬁed otherwise, all dimensions are given in mm.

1.1.2 Symbols, type of risk

Symbol Type of risk

Injury

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-

Electrocution

Burns or scalding

injury or death.

ous or minor injury.

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OPERATION

Safety

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.

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

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

CAUTION Burns During operation, the tap can reach temperatures in excess of 50°C, e.g. in the case of water that has been preheated by solar energy. 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.

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:

- The temperature limit (childprooﬁng) is user adjustable

- Anti-scalding protection can be enabled by a qualiﬁed contractor.

Damage to the appliance and environment

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

The electronically controlled instantaneous water heater with automatic output matching maintains a consistent outlet temperature. This is irrespective of the inlet temperature, up to the maximum output of the appliance.

DHW temperature

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

Display backlighting

The display has white backlighting. During the draw-off process or a temperature adjustment, backlighting is enabled.

Temperature limit (childprooﬁng)/ anti-scalding protection

You can set the temperature limit (childprooﬁng) individually using the Tmax key. The selected temperature then limits the setting range of the DHW outlet temperature.

The qualiﬁed contractor can also enable static anti-scalding protection from 43°C for you (see chapter "Alternative installation options/ Anti-scalding protection"). The anti-scalding temperature then functions as the upper limit for the DHW outlet temperature and the temperature limit (childprooﬁng).

Heating system

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, heating output is shut down automatically for one minute, thereby protecting the heating system.

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OPERATION

ENGLISH

Settings and displays

4. Settings and displays

4.1 User interface

1 Temperature selector 2 LED scalding risk indicator 3 Memory keys M1 and M2 4 Display 5 Temperature limit Tmax

Display symbols

Tmax

1 Set temperature setting range 30 - 60°C (without end-stop)

35°C ... 43°C in 0.5°C increments, other temperature ranges

in 1°C increments 2 Call up preferred temperatures 3 Set the temperature limit

Memory keys M1 and M2 can each be assigned a preferred temperature.

 Select a preferred temperature.

 Press one of the M keys for 3seconds to save the preferred

temperature . The temperature is conﬁrmed with 1x ﬂashing.

Note

If the outlet temperature is not sufﬁciently high when the draw-off valve is fully open and the temperature selector is set to maximum, then more water is ﬂowing through the appliance than can be heated by the heating system

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(working at maximum output).

 Reduce the water volume at the draw-off valve until

the preferred temperature delivery is achieved.

4.2 Temperature limit (childprooﬁng)

1 In the event of an appliance fault, a spanner appears 2 Segment display for temperature setting with °C 3 Performance bar, 10 - 100% 4 Tmax, displayed when temperature limit is enabled

Setting the temperature

Tmax

The temperature limit can be individually set between 30°C and

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50°C.

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Enabling the temperature limit (childprooﬁng)

 Press and hold the Tmax key for >6seconds. The set value

display ﬂashes and the current temperature limit is shown.

 The value for the temperature limit can be changed while

the display is ﬂashing. If no key is pressed for 10seconds,

the display stops ﬂashing and the value is stored. The display

then shows the set value and the Tmax symbol.

Disabling the temperature limit (childprooﬁng)

 Press and hold the Tmax key for >6seconds.  The Tmax symbol on the display is no longer shown.

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OPERATION

Cleaning, care and maintenance

4.3 Inlet temperature information

If the inlet temperature is higher than the preferred temperature, e.g. if water has been preheated by solar energy, the display alternates between showing "hot" and the measured inlet temperature. The LED scalding risk indicator also ﬂashes.

Recommended setting for operation with a thermostatic valve and water preheated by solar energy

 Set the temperature at the appliance to the max.

temperature.

4.4 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.

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):

DEL ... AU No.: 000000-0000-000000

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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 star t despite the DHW valve being fully open.

Cold water flows briefly while hot water is being drawn.

The temperature at the appliance cannot be set to >43°C.

There is no voltage in the appliance.

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

The water supply has been interrupted.

The air sensor detects air in the water and the appliance's heating output is briefly switched off.

The Tmax childproofing is enabled.

The anti-scalding protection in the appliance is enabled.

Check the fuses/MCBs in your fuse box/distribution panel.

Clean and/or descale the aerator or shower head.

Vent the appliance and the cold water inlet line (see chapter "Settings / Following an interruption to the water supply").

The appliance restarts automatically after 1minute.

Disable the childproofing (see chapter "Appliance description")

Your qualified contractor can disable the anti-scalding protection for you.

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ENGLISH

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.

Flow pressure

If the ﬂow rate is not sufﬁcient to switch on the appliance even when the tap is open, remove the ﬂow limiter and replace it with the plastic proﬁle washer supplied.

If required, the pressure in the water installation can also be raised.

Note

For the thermostatic valve to function correctly, the ﬂow limiter for this valve must not be replaced with the plastic proﬁle washer.

Material losses

Observe the maximum inlet temperature. Higher temperatures may damage the appliance. You can limit the maximum inlet temperature by installing a central thermostatic valve.

7.2 Instructions, standards and regulations

8. Appliance description

8.1 Standard delivery

The following are delivered with the appliance:

- Wall mounting bracket

- Installation template

- 2 plugs

- 2 extensions

- 2 caps

- 2 tees

- 8 ﬂat gaskets

- Strainer

- 2 ﬂow limiters

- Plastic proﬁle washer

- Plastic connection pieces / installation aid

- Cover and back panel guides

9. Preparations

 Flush the water line thoroughly.

Taps/valves

 Use appropriate pressure-tested taps. Open taps are not

permitted.

A safety valve is not required.

Permissible water pipe materials

- Cold water inlet pipe: Galvanised steel pipe, stainless steel pipe, copper pipe or plastic pipe

- DHW outlet pipe: Stainless steel pipe, copper pipe or plastic pipe

Note

Observe all applicable national and regional regulations and instructions.

- The protection rating IP 25 (hoseproof) can only be ensured with a correctly ﬁtted cable grommet.

- The speciﬁc electrical resistance of the water must not fall below that stated on the type plate. In a linked water network, factor in the lowest electrical resistance of the water (see chapter "Speciﬁcation/ Application areas"). Your water supply utility will advise you of the speciﬁc electrical water resistance or conductivity.

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Flow rate

Flexible water connection lines

Material losses

If plastic pipework systems are used, take into account the maximum inlet temperature and the maximum pressure (see chapter "Speciﬁcation/ Data table").

 Ensure that the ﬂow rate (see chapter "Speciﬁcation/ Data

table", On) is sufﬁcient for switching on the appliance.

 Increase the mains water pressure if the required ﬂow rate is

not sufﬁcient with an open draw-off valve.

 If the appliance is installed with ﬂexible water connection

lines, ensure that the pipe bends do not become twisted. Pipe bends have a bayonet ﬁtting and are installed inside the appliance.

 Secure the back panel with an additional screw at the

bottom.

INSTALLATION

Installation

9.1 Installation site

Material losses

Only install the appliance in rooms free from the risk of frost.

 Always install the appliance vertically near the draw-off

point.

The appliance is suitable for undersink and oversink installations.

Note

Mount the appliance on a sufﬁciently load-bearing wall.

Undersink installation

1 2

1 Cold water inlet 2 DHW outlet

10. Installation

10.1 Standard installation

- Electrical connection in the lower section of the appliance for installation on unﬁnished walls

- Water connection for installation on ﬁnished walls

- For the appliance with adjustable connected load, the middle load is preset.

For further installation options, see chapter "Installation options".

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 Open the appliance.

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Oversink installation

1 Cold water inlet pipe 2 DHW outlet pipe

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 Remove the back panel by pressing the two locking hooks

and pulling the lower part of the back panel forwards.

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 Mount the wall mounting bracket.

Align the installation template based on the existing electrical connection when marking out the drill holes (wall mounting and lower back panel).

If you want to adapt the existing water connections, take the dimensions from the drawing when marking out the drill holes; see chapter "Speciﬁcation/ Dimensions and connections". In this case, check beforehand that the electrical connection lies within one of the areas marked on the installation template.

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