DEL 27 Plus - Boiler STIEBEL ELTRON - Free user manual and instructions

USER MANUAL DEL 27 Plus STIEBEL ELTRON

1.2 Other symbols in this documentation_27

1.3 Units of measurement 27

Declaration of Conformity_28

4.3 Selecting the set temperature_29

4.4 Temperature limit via internal anti-scalding

protection (qualified contractor)_29

4.5 Temperature limit Tmax (user)_29

4.6 Allocating temperature memory buttons 29

5. Cleaning, care and maintenance_30

7.1 General safety instructions_31

7.2 Shower operation_31

7.3 Instructions, standards and regulations_31

9.1 Installation location 32

9.2 Minimum clearances 32

9.3 Water installation 32

11.2 Initial start-up_35

13.1 Electrical connection from above on unfinished walls_36

13.2 Electrical connection on unfinished walls with short

13.3 Electrical connection on finished walls 37

13.4 Connecting a load shedding relay_37

13.5 Water installation on finished walls 37

13.6 Water installation on finished walls with solder/

press-fit fittings_38

13.7 Fitting appliance cover for water installation on

13.8 Lower back panel section installation with threaded

fittings on finished walls_38

13.9 Wall mounting bracket when replacing an appliance_38

13.10 Installation with offset tiles_38

13.11 Pivoting appliance cover_39

13.12 Horizontal installation of the appliance_39

13.13 Operation with preheated water_39

17.1 Dimensions and connections_41

17.7 Energy consumption data_43

Step-by-step guide Video on installing the appli ance www.stiebel-eltron.com DEL Plus I 25 ENGLISHSPECIAL INFORMATION SPECIAL INFORMATION - The appliance may be used by children aged 3 and older and persons with reduced physical, sensory or mental capabilities or a lack of ex¬ perience and know-how, provided that they are supervised or they have been instructed on how to use the appliance safely and have understood the potential risks. Children must never play with the appliance. Children must never clean the appliance or perform user maintenance unless they are supervised. - During operation, the tap can reach tempera¬ tures up to 70 °C. There is a risk of scalding at outlet temperatures in excess of 43 °C. - The appliance is suitable for supplying a shower (shower operation). If the appliance is also or exclusively used for shower opera¬ tion, the qualified contractor must adjust the temperature setting range to 55 °C or less using the internal anti-scalding protection on the appliance. When using preheated water, it must be ensured that the ¡niet temperature does not exceed 55 °C. - Ensure the appliance can be separated from the power supply by an isolator that discon¬ nects all poles with at least 3 mm contact separation. - The specified voltage must match the power supply. - The appliance must be connected to the earth conductor. - The appliance must be permanently connect¬ ed to fixed wiring. - Secure the appliance as described in chapter "Installation

Data table"). - The specific water resistivity of the mains water supply must not be undershot (see chapter "Installation / Specification / Data table"). - Drain the appliance as described in chapter "Installation

1. General information

The chapters "Special information" and "Operation" are intended for both users and qualified contractors. The chapter "Installation" is intended for qualified contractors. Note Read these instructions carefully before using the appli ance 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 /W\ (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 bythe adjacent symbol. ► Read these texts carefully. Symbol Meaning Material losses (appliance damage, consequential losses and environmen¬ tal 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 oth¬ erwise.

This appliance is suitable for heating domestic hot water or for reheating preheated water. The appliance can supply one or more draw-off points. Water will not be reheated if the maximum inlet temperature for reheating is exceeded. The appliance is intended for domestic use. It can be used safely by untrained persons. The appliance can also be used in non-do-mestic environments, e.g. in small businesses, as long as it is used in the same way. Any other use beyond that described shall be deemed inappro¬ priate. Observation of these instructions and of the 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 up to 70 °C. There is a risk of scalding at outlet temperatures in ex¬ cess of A3 °C. CAUTION Burns If children or persons with limited physical, sensory or mental capabilities use the appliance, set a temperature limit. Once set, check the temperature limit is working correctly. If a permanent and unchangeable temperature limit is required, have the internal anti-scalding protection set by a qualified contractor. www.stiebel-eltron.com DEL Plus I 27 ENGLISHOPERATION Appliance description

If operating with preheated water, e.g. if using a solar thermal system, observe the following information: - The DHW temperature may exceed the set tempera¬ ture or a set temperature limit. - The dynamic anti-scalding protection between the appliance and a wireless remote control may not be effective. ► In such cases, limit the temperature with an up¬ stream central thermostatic valve.

WARNING Injury The appliance may be used by children aged 3 and older and persons with reduced physical, sensory or mental capabilities or a lack of experience and know-how, pro¬ vided that they are supervised or they have been in¬ structed on how to use the appliance safely and have understood the potential risks. Children must never play with the appliance. Children must never clean the ap¬ pliance or perform user maintenance unless they are supervised.

Material losses The user should protect the appliance and its tap against frost.

See type plate on the appliance.

Declaration of Conformity Note DEL Plus: STIEBEL ELTRON hereby declares that the radio equipment type complies with Directive 2014/53/ EU. The full text of the

Declaration of Conform¬ ity can be found at the following internet address: www.stiebel-eltron.de/downloads

3. Appliance description

The appliance switches on automatically as soon as you open the hot water valve on the tap. When you close the tap, the appliance switches off again automatically. The appliance heats water as it flows through it. The set tempera¬ ture is adjustable. Upwards of a certain flow rate, the control unit selects the required heating output, subject to the temperature selected and the cold water temperature. The electronically controlled instantaneous water heater with au¬ tomatic output matching maintains a consistent outlet tempera¬ ture. It is irrespective of the inlet temperature, up to the maximum output of the appliance. If the appliance is operated with preheated water and the inlet temperature exceeds the selected temperature, the word "hot" and the inlet temperature are displayed alternately, and the "hot" LED flashes. The water is not heated further. You can store different set temperatures and call them up quickly. With the ECO function, the flow rate is limited to 3 preset levels. The appliance has setting options for a temperature limit (Tmax function, user) and internal anti-scalding protection (qualified contractor). The backlight switches on automatically as soon as water starts to flow through the appliance or you make a change on the user interface. The backlight switches off automatically after water stops flowing or if no action is performed. Heating system The bare wire heating system is enclosed within a pressure-tested plastic jacket. The heating system with its stainless steel heater spiral is suitable for hard and soft water areas and is largely in¬ susceptible to scale build-up. The heating system ensures rapid and efficient DHW provision. Note The appliance is equipped with an air detector that large¬ ly prevents damage to the heating system. If, during op¬ eration, air is drawn into the appliance, the appliance shuts down for one minute, thereby protecting the heat¬ ing system.

1 ECO indicator [rolling, levels 1 - 3, OFF] 2 Output bar [10 -100 %] 3 Segment display [°C/°F] 4 In the event of an appliance fault, a spanner appears 5 Operating lock [ON/OFF] 6 Tmax, displayed when temperature limit is enabled

4.3 Selecting the set temperature

Note If the outlet temperature is not high enough 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 (appliance working at maximum output). ► Use the ECO button to reduce the water volume until the required temperature is achieved.

4.4 Temperature limit via internal anti-scalding

protection (qualified contractor) If required, the qualified contractor can set a permanent temper¬ ature limit, for example in nurseries, hospitals, etc. When supplying a shower, the appliance temperature setting range must be adjusted by the qualified contractorto 55 °C or less. If the anti-scalding protection function is enabled, "Tmax" flashes continually once the set temperature has been reached.

4.5 Temperature limit Tmax (user)

The temperature limit allows you asa userto restrict the adjusta¬ ble set temperature at the appliance to a maximum value. Your qualified contractor can set an additional temperature limit for anti-scalding protection. This temperature then dictates the upper limit of the setting range for the temperature limit function.

4.5.1 Enabling the temperature limit

► Press and hold buttons "1" and "2" for longer than 5 seconds, until "Tmax" and the temperature display flash. ► Select a temperature limit. 10 seconds after completing the setting, the menu item will dis¬ appear automatically. If the high limit safety cut-out is enabled, "Tmax" is continuously displayed. Check that the upper temperature limit has been correctly applied.

4.5.2 Disabling the temperature limit

► Disable the high limit safety cut-out by pressing and holding buttons "1" and "2" for longer than 5 seconds.

4.6 Allocating temperature memory buttons

Memory buttons "1" and "2" can each be assigned a required temperature. ► Select the required temperature. ► To store the required temperature, press and hold button "1" or "2" for longer than 3 seconds. The selected temperature flashes once to confirm.

Menu Description Temperature display Select °C or °F Operating lock Select ON or OFF. Symbol displayed Fault code display Displays E1...E3 if there is a fault on the appli- ance. Call qualified contractor.

► To call up the menu, press and hold the ECO button for longer than 5 seconds. ► To select, turn the temperature selector. ► Press the ECO button once more. ► To quit the menu, press and hold the ECO button for longer than 5 seconds. The menu switches off automatically if no operation has been performed for 30 seconds. Note To call up the menu when the operating lock is enabled, press and hold the ECO button for longer than 10 seconds. www.stiebel-eltron.com DEL Plus I 29 ENGLISHOPERATION Cleaning, care and maintenance

4.9 Inlet temperature information

If the appliance is operated with preheated water and the inlet temperature exceeds the selected temperature, the word "hot" and the inlet temperature are displayed alternately, and the "hot" LED flashes.

4.10 Recommended settings

Your instantaneous water heater offers maximum precision and maximum convenience in DHW provision. Should you nonetheless be operating the appliance with a thermostatic valve, we recom¬ mend that you: ► Adjust the set temperature on the appliance to over 50 °C. Then set the required set temperature on the thermostatic valve. Saving energy The following recommended settings will result in the lowest en¬ ergy consumption: - 38 °C for hand washbasins, showers, bath - 55 °C for kitchen sinks Internal anti-scalding protection (qualified contractors) If required, the qualified contractor can set a permanent temper¬ ature limit, for example in nurseries, hospitals, etc. Limiting it in this way prevents water from flowing out of the appliance at temperatures which could cause injury. Recommended setting for operation with a thermostatic valve and preheated water ► Set the temperature at the appliance to the maximum temperature. For use in shower operation, the thermostatic valve must be set to a maximum of 55 °C. Following an interruption to the water supply

Material losses To ensure that the bare wire heating system is not dam¬ aged following an interruption to the water supply, the appliance must be restarted by taking the following steps. ► 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 power back ON.

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 tap out¬ lets can be removed using commercially available descaling agents.

Problem Cause Remedy The appliance will not There is no power. Check the fuses/MCBs in start despite the DHW your fuse box/distribu-valve being fully open. tion board. The aerator in the tap Clean and/or descale the or the shower head is aerator or shower head, scaled up or dirty. The water supply has Vent the appliance and been interrupted. the cold water inlet line. When hot water is being The air detector de- The appliance restarts drawn off, cold water tects air in the water. It automatically after flows for a short period, switches off the heating 1 minute. output briefly. The required tempera- The high limit safety Disable temperature ture cannot be set. cut-out and/or internal limiting. The internal an-anti-scalding protection ti-scalding protection can are enabled. only be adjusted by the qualified contractor. The flow rate is too low. ECO function is enabled. Select a different ECO level or disable the ECO function. No settings can be made The operating lock is Press and hold the ECO on the programming enabled. button for more than unit. 10 seconds to disable the operating lock. Note Programming unit displays and selected settings are re¬ tained following a power failure. If you cannot remedy the fault, contact your qualified contractor. To facilitate and speed up your request, provide the number from the type plate (000000-0000-000000). 30 DEL PLus www.stiebeL-eLtron.comINSTALLATION Safety INSTALLATION Step-by-step guide Preparing for installation

Only a qualified contractor should carry out installation, commis¬ sioning, 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. Material losses Observe the maximum inlet temperature. Higher tem¬ peratures may damage the appliance. You can limit the maximum inlet temperature by installing a central ther¬ mostatic valve. WARNING Electrocution This appliance contains capacitors which are discharged when disconnected from the power supply. The capacitor discharge voltage may briefly exceed 60 V DC.

7.2 Shower operation

CAUTION Burns ► When supplying a shower, set the internal an¬ ti-scalding protection to 55 °C or less; see chapter "Commissioning Preparations". CAUTION Burns If operating with preheated water, e.g. if using a solar thermal system, observe the following information: - The DHW temperature may exceed the set tempera¬ ture or a set temperature limit. - The dynamic anti-scalding protection between the appliance and a wireless remote control may not be effective. ► In such cases, limit the temperature with an up¬ stream central thermostatic valve.

7.3 Instructions, standards and regulations

Note Observe all applicable national and regional regulations and instructions. - The IP 24 / IP 25 protection rating can only be ensured with a correctly fitted cable grommet. - The specific electrical resistivity of the water must not fall below that stated on the type plate. In a linked water net¬ work, factor in the lowest electrical resistivity of the water. Your water supply utility will advise you of the specific elec¬ trical water resistivity or conductivity.

8. Appliance description

The following are delivered with the appliance: - Wall mounting bracket - Installation template - 2 twin connectors - 3-way ball shut-off valve for cold water - Tee for domestic hot water - Flat gaskets - Strainer - Plastic profile washer - Plastic connection pieces/installation aid - Cover and back panel guides - jumper for internal anti-scalding protection - jumper for output changeover (only on DEL 18/21/24 Plus)

Wireless remote control - FFB 4 Set Taps - MEKD mono lever kitchen pressure tap - MEBD mono lever bath pressure tap Plugs

If you use taps other than the recommended pressure taps on finished walls, please use the plugs. Installation set for finished walls - Solder fitting - copper pipe for soldered connection 0 12 mm - Press-fit fitting - copper pipe - Press-fit fitting - plastic pipe (suitable for Viega: Sanfix-Plus or Sanfix-Fosta) Universal mounting frame - Mounting frame with electrical connections Pipe assembly for undersink appliances You will need the undersink installation set if you make the water connections (G A) at the top of the appliance. Pipe assembly for offset installation Use this pipe assembly if you intend to offset the appliance by up to 90 mm downwards from the water connection. www.stiebel-eltron.com DEL Plus I 31 ENGLISHINSTALLATION Preparation Pipe assembly for replacing a gas water heater You will need this pipe assembly set if the existing installation has gas water heater connections (cold water connection on the left-hand side, DHW connection on the right-hand side). Pipe assembly for DHB water plug-in couplings Use the water plug-in couplings if the existing installation contains water plug-in connections from a DHB water heater. Load shedding relay (LR 1-A) The load shedding relay for installation in the distribution board provides priority control for the instantaneous water heater when other appliances, such as electric storage heaters, are being op¬ erated simultaneously.

9.1 Installation location

Material losses Install the appliance in a room free from the risk of frost. ► Always install the appliance vertically and near the draw-off point. For horizontal installation, see chapter "Alternative in¬ stallation methods / Horizontal installation of the appliance". The appliance is suitable for undersink and oversink installation. 2 DHW outlet 2 DHW outlet Note ► Mount the appliance on the wall. The wall must have sufficient load bearing capacity.

9.2 Minimum clearances

► Maintain the minimum clearances to ensure trouble-free op eration of the appliance and facilitate maintenance work.

9.3 Water installation

► Flush the water line thoroughly. Taps Use appropriate pressure taps. Open vented taps are not per missible. Note Never use the 3-way ball shut-off valve in the cold water inietto reduce the flow rate. The 3-way ball shut-off valve is intended only to shut off the cold water inlet. Permissible water line materials - Cold water inlet line: Pipes made from galvanised steel, stainless steel, copper or plastic - DHW outlet line: Pipes made from stainless steel, copper or plastic Material losses If plastic pipework systems are used, take into account the maximum inlet temperature and the maximum per¬ missible pressure. Flow rate ► Ensure that the flow rate for switching on the appliance is achieved. ► Increase the water line pressure if the required flow rate is not achieved when the draw-off valve is fully open. 32 DEL Plus www.stiebel-eltron.comINSTALLATION Installation

Factory settings DEL 18/21/24 Plus DEL 27 Plus Internal anti-scalding pro- °C 60 60 tection Connected load 21 27 Adjustable connected load x Standard installation DEL 18/21/24 Plus DEL 27 Plus Electrical connection from below x x on unfinished walls Water connection on unfinished x x walls For further installation options, see chapter "Alternative instal¬ lation methods".

10.1 Standard installation

Opening the appliance ► Open the appliance by holding the fascia at the side and pull¬ ing forwards away from the appliance cover. Undo the screw. Pivot open the appliance cover. ► Remove the back panel by pressing the two locking tabs and pulling the lower back panel section forwards. Preparing the power cable on unfinished walls, for connection from below 1 Cable entry installation aid ► Prepare the power cable. Fitting the wall mounting bracket ► Mark out the holes for drilling using the installation tem¬ plate. If the appliance is to be installed on finished walls, also mark out the fixing hole in the lower section of the template. ► Drill the holes and secure the wall mounting bracket at 2 points using suitable fixing materials (screws and rawl plugs are not part of the standard delivery). ► Fit the wall mounting bracket. Installing the twin connectors

Material losses Carry out all water connection and installation work in accordance with regulations. ► Seal and insert the twin connectors. Making the water connection 1 DHW with tee 2 Gasket 3 Cold water with 3-way ball shut-off valve 4 Strainer 5 Plastic profile washer ► Secure the tee and 3-way ball shut-off valve, each with a flat gasket, to the twin connector. Material losses The strainer must be fitted for the appliance to function. ► When replacing an appliance, check whether the strainer is installed. www.stiebel-eltron.com DEL Plus I 33 ENGLISHINSTALLATION Installation Installing the appliance Step-by-step guide Installation Note If you are installing the appliance with flexible pipe con nections, also secure the back panel with a screw. 2 Cable grommet Use the installation aid for easier wiring access through the cable grommet (see plastic parts set supplied). ► Remove the cable grommet from the back panel. ► Pull the cable grommet over the cable sheath of the power cable. For large cable cross-sections, enlarge the hole in the cable grommet if necessary. ► Remove the transport protection plugs from the appliance pipe connections. ► Bend the power cable 45° upwards. ► Route the power cable and cable grommet through the back panel from the rear. ► Install the appliance on the threaded studs of the wall mounting bracket. ► Press the back panel firmly into place, aligning it correctly. ► Lock the fixing toggle by turning it 90° clockwise. ► Pull the cable grommets into the back panel until both lock¬ ing tabs engage. ► Fit the pipe connections with flat gaskets onto the water connections. ► Open the 3-way ball shut-off valve or the shut-off valve in the cold water inlet line. Making the electrical connection

WARNING Electrocution Carry out all electrical connection and installation work in accordance with relevant regulations. WARNING Electrocution The connection to the power supply must be in the form of a permanent connection in conjunction with the re¬ movable cable grommet. Ensure the appliance can be separated from the power supply by an isolator that dis¬ connects all poles with at least 3 mm contact separation.

WARNING Electrocution Ensure that the appliance is earthed.

Material losses Observe the type plate. The specified rated voltage must match the mains voltage. ► Connect the power cable to the mains terminal. Fitting the lower back panel section 1 Diffuser on lower back panel ► Fit the lower back panel section into the back panel. Check that both locking tabs are engaged. ► Align the mounted appliance by undoing the fixing toggle, aligning the power supply and back panel, and then re-tight¬ ening the fixing toggle. If the back panel does not sit flush against the wall, you can secure the appliance at the bottom with an additional screw.

Material losses The cover plate of the lower back panel section must not bend when installed. 34 I DEL Plus www.stiebel-eltron.comINSTALLATION Commissioning

Internal anti-scalding protection via jumper slot ► Install the anti-scalding protection setting jumper in the re¬ quired position (= temperature in °C) on the pin strip. Jumper position Description 43 For example in nurseries, hospitals, etc. 55 Max. for shower operation 60 Factory setting No jumper limited to 43 °C CAUTION Burns If operating with preheated water, e.g. if using a solar thermal system, the internal anti-scalding protection and the temperature limit Tmax, which can be set by the user, may be exceeded. ► In this case, limit the temperature with an upstream central thermostatic valve. Changing connected load via jumper slot, DEL 18/21/24 Plus only If you selecta connected load other than the 21

factory setting for appliances with selectable connected load, you will need to reposition the jumper. ► Install the jumper in the required position on the pin strip. Jumper position Connected load

11.2 Initial start-up

► Open and close all connected draw-off valves several times, until all air has been purged from the pipework and the appliance. ► Carry out a tightness check. ► Activate the safety switch by firmly pressing the reset button (the appliance is delivered with the safety switch disabled). ► Connect the programming unit connecting cable to the PCB. Note For undersink installation, the appliance cover should be turned round for easier operation; see chapter "Alter¬ native installation methods / Pivoting appliance cover". ► Hook the appliance cover at the top rear into the back panel. Pivot the appliance cover downwards. Check that the appli¬ ance cover is securely seated at both top and bottom. ► Tick the selected connected load and rated voltage on the ap pliance cover type plate (on both sides). Use a ballpoint pen to do this. ► Secure the appliance cover with the screw. ► Fit the fascia to the appliance cover. ► Remove the protective film from the user interface. www.stiebel-eltron.com DEL Plus I 35 ENGLISHINSTALLATION Appliance shutdown ► Switch on the power supply.

11.2.1 Appliance handover

► Explain the appliance function to users and familiarise them with how it works. ► Make the user aware of potential dangers, especially the risk of scalding. ► Hand over the instructions.

11.3 Recommissioning

Material losses To ensure that the bare wire heating system is not dam¬ aged following an interruption to the water supply, the appliance must be restarted by taking the following steps. ► Disconnect the appliance from the power supply by removing the fuses/tripping the MCBs. ► Open the tap for a minimum of one minute until the appliance and its upstream cold water inlet line are free of air. ► Switch the power back ON.

12. Appliance shutdown

► Isolate all poles of the appliance from the power supply. ► Drain the appliance (see chapter "Installation Maintenance / Draining the appliance").

13. Alternative installation methods

Overview of the alternative types of installation Electrical connection IP rating On unfinished walls, connected from above IP 25 On unfinished walls, connected from below, short IP 25 power cable On finished walls IP 24 Water connection IP rating On finished walls Other IP rating Installation with offset tiles IP 25 Pivoting appliance cover IP 25 Horizontal installation of the appliance IP 24 WARNING Electrocution Before any work on the appliance, disconnect all poles from the power supply.

13.1 Electrical connection from above on unfinished

walls 1 Cable entry installation aid ► Prepare the power cable. 1 Cable routing ► Reposition the mains terminal from the bottom to the top. To do this, undo the fixing screw. Turn the mains terminal with connecting cables 180° clockwise. Route the cable around the cable guide when doing so. Secure the mains terminal in place. ► Replace the cable grommets. ► Install the cable grommet from the top at the bottom. ► Pull the cable grommet over the cable sheath of the power cable. ► Install the appliance on the threaded studs of the wall mounting bracket. ► Push the back panel firmly against the wall. Lock the fixing toggle by turning it 90° clockwise. ► Pull the cable grommets into the back panel until both lock¬ ing tabs engage. ► Connect the power cable to the mains terminal. WARNING Electrocution The connecting wires must not protrude beyond the level of the mains terminal. 36 DEL Plus www.stiebel-eltron.comINSTALLATION Alternative installation methods

13.2 Electrical connection on unfinished walls with

short power cable ► Reposition the mains terminal further downwards. To do this, undo the fixing screw. Secure the mains terminal in place.

13.3 Electrical connection on finished walls

Note This type of connection changes the IP rating of the ap pliance. ► Change the type plate. Cross out "IP 25" and mark the box "IP 24". Use a ballpoint pen to do this. 1 Cable grommet Electrical connection on finished walls Dimension A Positioned in lower section of appliance

Positioned in upper section of appliance

► Prepare the power cable. Fit the cable grommet. Material losses If you break out the wrong knock-out in the back panel/ appliance cover by mistake, you must use a new back panel/appliance cover. ► Cleanly cut and break out the required cable entries from the back panel and appliance cover (for the positions, see chap¬ ter "Specification / Dimensions and connections"). Deburr any sharp edges with a file. ► Route the power cable through the cable grommet. ► Connect the power cable to the mains terminal.

13.4 Connecting a load shedding relay

Install a load shedding relay in the distribution board in conjunc¬ tion with other electric appliances, e.g. electric storage heaters. The relay responds when the instantaneous water heater starts.

Material losses Connect the phase that switches the load shedding relay to the indicated terminal of the mains terminal in the appliance (see chapter "Specification / Wiring diagram").

13.5 Water installation on finished walls

Note This type of connection changes the IP rating of the ap pliance. ► Change the type plate. Cross out "IP 25" and mark the box "IP 24". Use a ballpoint pen to do this. ► Fit water plugs with gaskets to seal the concealed connec¬ tions. All taps obtained as accessories are supplied with plugs and gaskets as standard. For pressure taps other than those recommended by us, plugs and gaskets can be ordered as accessories. ► Fit a suitable pressure tap. ► Push the lower back panel section under the connection pipes of the tap and push it into the back panel. ► Secure the connection pipes to the tee and the 3-way ball shut-off valve. Note You can break off the pipe fitting tabs on the lower back panel section if required. 1 Tab www.stiebel-eltron.com DEL Plus I 37 ENGLISHINSTALLATION Alternative installation methods

13.6 Water installation on finished walls with

solder/press-fit fittings Note This type of connection changes the IP rating of the ap¬ pliance. ► Change the type plate. Cross out "IP 25" and mark the box "IP 24". Use a ballpoint pen to do this. You can connect copper or plastic pipes using the accessories "solder fitting" or "press-fit fitting". With "solder fitting" with threaded fitting for 12 mm copper pipes, proceed as follows: ► Push the union nuts over the connection pipes. ► Solder the inserts to the copper pipes. ► Push the lower back panel section under the connection pipes of the tap and push it into the back panel. ► Secure the connection pipes to the tee and the 3-way ball shut-off valve. Note Observe the tap manufacturer's instructions.

13.7 Fitting appliance cover for water installation on

finished walls 1 Back panel guides 2 Screw 3 Cover guides with sealing lips on the pipe side 4 Pipe knock-out ► Cleanly saw and break out the pipe knock-outs in the appli ance cover. If necessary, use a file. ► Click the cover guides into place in the knock-outs. Note You can use the cover guides with sealing lips to com¬ pensate for a slight offset of the connection pipes and/ or if using the "press fitting" accessory. In this case, the back panel guides are not fitted. Only if using the "solder fitting" accessory and with precise adherence to all installation dimensions: ► Break the sealing lips out of the cover guides. ► Position the back panel guides on the pipes. Push them to¬ gether. Then push the guides against the back panel as far they will go. ► Secure the lower back panel section with a screw.

13.8 Lower back panel section installation with

threaded fittings on finished walls 1 Lower back panel section 2 Connection piece in the standard delivery 3 Screw If using threaded fittings on finished walls, the lower back panel section can also be installed after fitting the taps. To do this, carry out the following steps: ► Cut open the lower back panel section. ► Fit the lower back panel section by bending it out at the sides and guiding it over the pipes. ► Insert the connection pieces into the lower back panel sec¬ tion from behind. ► Click the lower back panel section into place. ► Secure the lower back panel section with a screw.

13.9 Wall mounting bracket when replacing an

appliance An existing STIEBEL ELTRON wall mounting bracket may be used when replacing appliances (except the DHF instantaneous water heater), as long as the fixing screw is in the lower right position. Replacing a DHF instantaneous water heater ► Reposition the fixing screw on the wall mounting bracket (the fixing screw has a self-tapping thread). ► Rotate the wall mounting bracket 180° and mount it on the wall (the DHF logo is then turned towards you).

13.10 Installation with offset tiles

1 Minimum contact area of the appliance 2 Maximum tile offset ► Adjust the wall clearance. Lock the back panel in place using the fixing toggle (turn 90“ clockwise). 38 DEL PLus www.stiebeL-eLtron.comINSTALLATION Alternative installation methods

13.11 Pivoting appliance cover

The appliance cover should be turned round for undersink in stallation. ► Remove the programming unit from the appliance cover by pressing the locking hooks and removing the programming unit. ► Turn the appliance cover (not the appliance) the other way up and refit the programming unit. Push the programming unit home in parallel until all locking tabs engage. When engaging the locking tabs, apply counter pressure by pushing against the appliance cover from the inside. ► Insert the connecting cable plug of the programming unit into the PCB (see chapter "Commissioning / Initial start-up"). ► Hook the appliance cover in at the bottom. Pivot the appli¬ ance cover up to the back panel. ► Secure the appliance cover. ► Fit the cover onto the appliance cover. WARNING Electrocution All 4 locking tabs on the programming unit must click into place. The locking tabs must be complete and undam¬ aged. If the programming unit is not inserted correctly, user protection against contact with live components cannot be ensured.

13.12 Horizontal installation of the appliance

Horizontal installation The appliance can also be mounted horizontally on the wall (turned 90° to the left, with the water connections on the right). The installation, water and electrical connections are described in chapters "Standard installation" and "Alternative installation methods". 2 DHW outlet Preparation The appliance cover must be provided with a condensate drain opening of min. 0 5.0 mm to max. 0 6.0 mm at the marked po¬ sition. 1 Appliance cover with opening for condensate drain 2 Back panel with additional fixing screw ► Drill a hole from the outside through the dismantled appli¬ ance cover at the marked point. Alternatively, you can punch a hole in the appliance cover from the inside at the marked point. In this case, you must then enlarge the hole to the required diameter from the outside. Deburr any sharp edges with a file. ► Secure the appliance back panel with an additional screw. Material losses An appliance cover with an existing condensate drain opening must no longer be used for vertical installation of the appliance. Note For the horizontal installation alternative, please note the following points: - Installation is only permissible with direct wall mounting. The universal mounting frame cannot be used. The installation versions "Installation with offset tiles" and "Rotated appliance cover" are not permis¬ sible. This type of connection changes the IP rating of the appliance. Cross out "IP 25" on the type plate and mark the box "IP 24". Use a ballpoint pen to do this.

13.13 Operation with preheated water

You can restrict the maximum inlet temperature by installing a central thermostatic valve. www.stiebel-eltron.com DEL Plus I 39 ENGLISHINSTALLATION Service information

14. Service information

Overview of connections 1 Flow limiter 2 Flow sensor 3 High limit safety cut-out, automatic reset 4 NTC sensor 5 Pin strips for connected load and anti-scalding protection 6 Programming unit plug-in position 7 Diagnostic traffic light

WARNING Electrocution To test the appliance, it must be connected to the power supply. Note When testing the appliance using the diagnostic traffic lights, water must be flowing. Appliance cover retainer Indicator options for diagnostic traffic light (LED) 1*001 Red Illuminates in the event of a fault IQ*oi Yellow Illuminates in heating mode/flashes when output limit reached |QQ*1 Green Flashing: Appliance connected to power supply_ Diagnostic traffic lights (draw-off mode) Fault Cause Remedy No LEO illuminates Green flashing, yellow off, red off Green flashing, yellow on, red off Green flashing, yellow on, red off Green flashing, yellow flashing, red off Green flashing, yellow off, red on Appliance does not heat up No DHW No display No DHW; outlet temperature does not match set value No DHW; outlet temperature does not match set value No DHW; outlet temperature does not match set value One or more mains power phases missing Faulty PCB Appliance starting flow rate not reached; shower head/aerator scaled up Appliance starting flow rate not reached; strainer in cold water inlet dirty Flow meter not attached Flow meter faulty or dirty Faulty PCB loose connecting cable between PCB and program¬ ming unit Faulty connecting cable between PCB and program¬ ming unit Programming unit faulty Faulty PCB Tap faulty Faulty outlet sensor Heating system faulty Faulty PCB Appliance is operating at its output limit Appliance is operating at its output limit Heating system faulty One or more mains power phases missing Air detection has responded Check fuses/MCBs in distribution board Replacing the function module Descale/replace the shower head/aerator Cleaning the strainer Check plug-in connection; correct if necessary Replacing the flow meter Replacing the function module Check plug-in connections; correct if necessary Check connecting cable; replace if necessary Replacing the programming unit Replacing the function module Replace tap Replace the outlet sensor Replacing the function module Replacing the function module Reduce flow rate; select one of the ECO levels Check jumper position for connected load Replacing the function module Check fuses/MCBs in distribution board Continue draw-off for >1 min 40 I DEL Plus www.stiebel-eltron.comINSTALLATION Maintenance

15.1 Fault code display

If there is an appliance fault, the spanner flashes on the display. ► To call up the fault code display, press the ECO button for more than 5 seconds. Diagnostic traffic lights (draw-off mode) Display shown Fault Cause Remedy Green flashing, yellow off, red on Green flashing, yellow off, red on Green flashing, yellow off, red on Spanner flashes (display El and spanner in menu "Fault code display") Spanner flashes (display E2 and spanner in menu "Fault code display") Spanner flashes (display E3 and spanner in menu "Fault code display") No DHW; outlet temperature does not match set value No DHW No DHW Safety switch not activated during "Commissioning" Safety switch triggered by high limit safety cut-out Safety switch responds again after high limit safety cut-out has been checked; high limit safety cut-out faulty Safety switch responds again; PCB faulty PCB faulty (lead break or short circuit in inlet sensor) Short circuit in outlet sensor Activate safety switch by pressing the reset button firmly Check high limit safety cut-out (plug-in connection, connecting cable); activate safety switch Replace high limit safety cut-out; acti¬ vate safety switch and draw off water at the maximum set value for >1 min Replacing the function module Replacing the function module Check outlet sensor; replace if neces¬ sary

WARNING Electrocution Before any work on the appliance, disconnect all poles from the power supply. This appliance contains capacitors which are discharged when disconnected from the power supply. The capacitor discharge voltage may briefly exceed 60 V DC. Draining the appliance The appliance can be drained for maintenance work.

Hot water may escape when you drain the appliance. ► Close the 3-way ball shut-off valve or the shut-off valve in the cold water inlet line. ► Open all draw-off valves. ► Undo the pipe connections from the appliance. ► Store the dismantled appliance in a room free from the risk of frost, as water residues remaining inside the appliance can freeze and cause damage. Cleaning the strainer If dirty, clean the strainer in the threaded cold water fitting. Close the 3-way ball shut-off valve or the shut-off valve in the cold water inlet line before removing, cleaning and refitting the strainer.

17.1 Dimensions and connections

DEL Plus b02 Entry electrical cables 1 On unfinished walls cOl Cold water inlet Male thread 1/2 A c06 DHW outlet Male thread 1/2 A www.stiebel-eltron.com DEL Plus I 41 ENGLISHINSTALLATION Specification Alternative connection options b02 Entry electrical cables I On unfinished walls b03 Entry electrical cables II b04 Entry electrical cables III On unfinished walls On finished walls DEL Plus

3/PE - 380-415 V 1 Power PCB with integral safety switch 2 Bare wire heating system 3 High limit safety cut-out 4 Mains terminal Priority control with load shedding relay LR 1-A 1 Control cable to the contactor of the second appliance (e.g. electric storage heater) 2 Control contact drops out when switching the instantaneous water heater on.

Material losses If the appliance is replaced, also replace the load shed ding relay and contactor of the 2nd appliance.

The DHW output is subject to the connected power supply, the appliance's connected load and the cold water inlet temperature. The rated voltage and rated output can be found on the type plate. Connected load in 38 °C DHW output in l/min Rated voltage Cold water inlet temperature 380 V 400 V 415 V 5 °C 10 °C 15 °C 20 °C DEL 18/21/24 Plus 16.2 7.0 8.3 10.1 12.9 19 8.2 9.7 11.8 15.1 21.7 9.4 11.1 13.5 17.2 18 7.8 9.2 11.2 14.3 21 9.1 10.7 13.0 16.7 24 10.4 12.2 14.9 19.0 19.4 8.4 9.9 12.0 15.4 22.6 9.8 11.5 14.0 17.9 25.8 11.2 13.2 16.0 20.5 DEL 27 Plus 24.4 10.6 12.4 15.2 19.4 27 11.7 13.8 16.8 21.4 Connected load in 50 °C DHW output in l/min Rated voltage Cold water inlet temperature 380 V 400 V 415 V 5 °C 10 °C 15 °C 20 °C DEL 18/21/24 Plus 16.2 5.1 5.8 6.6 7.7 19 6.0 6.8 7.8 9.0 21.7 6.9 7.8 8.9 10.3 18 5.7 6.4 7.3 8.6 21 6.7 7.5 8.6 10.0 24 7.6 8.6 9.8 11.4 19.4 6.2 6.9 7.9 9.2 22.6 7.2 8.1 9.2 10.8 25.8 8.2 9.2 10.5 12.3 DEL 27 Plus 24.4 7.7 8.7 10.0 11.6 27 8.6 9.6 11.0 12.9

17.4 Application areas

Taps Tap pressure drop at a flow rate of 10 L/min Mono lever mixer tap, approx.

Sizing the pipework When calculating the size of the pipework, an appliance pressure drop of 0.1 MPa is recommended.

17.6 Fault conditions

the event of a fault, loads up to 80 °C at a pressure of 1.0 MPa can occur briefly in the installation.

17.7 Energy consumption data

Product datasheet: Conventional water heaters to regulation (ED) no. 812/2013 and 814/2013 / (S.l. 2019 No. 539

Schedule 2) DEL 18/21/24 Plus DEL 27 Plus 236739 236740 Manufacturer STIEBEL ELTRON STIEBEL ELTRON load profile S S Energy efficiency class A A Energy conversion efficiency % 39 39 Annual power consumption kWh 475 475 Default temperature setting °C 50 50 Sound power level dB(A) 15 15 Special information on measuring efficiency Measured at ECO level at highest flow rate, Measured at ECO level at highest flow rate maximum output and maximum set value. and maximum set value Daily power consumption kWh 2.184 2.177

DEL 18/21/24 Plus DEL 27 Plus Values Max. inlet temperature (e.g. pasteurisation) °C 70 70 ON l/min >2.5 >2.5 Flow rate at 28 K l/min 9.2/10.7/12.3 at 400 V 13.8 at 400 V Flow rate at 50 l/min 5.2/6.0/6.9 at 400 V 7.7 at 400 V Pressure drop for flow rate at 50 K (without flow limiter) MPa 0.06/0.08/0.1 0.13 Hydraulic data Nominal capacity 1 0.4 0.4 Dimensions Height mm 466 466 Width mm 225 225 Depth mm 116 116 Weights Weight kg 3.2 3.2 Note The appliance conforms to IEC 61000-3-12. Information on the appliance software Stiebel Eltron appliances may contain software of external suppliers (third party suppliers) which may be partly also be subject to an Open Source license. Some Open Source licenses are subject to the obligation to state the software, its authors as well as the licenses that apply to the software and to addition¬ ally provide the software as a source code or to offer to provide the source code. Stiebel Eltron therefore provides further infor¬ mation regarding third supplier software that it uses under the link https://www.stiebel-eltron.com/en/info/Licenses.html and also offers the source code there, if applicable. The software is provided only for compliance with the obligations under the Open Source licenses. Guarantee The guarantee conditions of our German companies do not apply to appliances acquired outside of Germany. In countries where our subsidiaries sell our products a guarantee can only be issued by those subsidiaries. Such guarantee is only grant¬ ed if the subsidiary has issued its own terms of guarantee. No other guarantee will be granted. We shall not provide any guarantee for appliances acquired in countries where we have no subsidiary to sell our products. This will not affect warranties issued by any importers. Environment and recycling ► Dispose of the appliances and materials after use

accor¬ dance with national regulations. ► If a crossed-out waste bin is pictured on the ap- pliance, take the appliance to your local waste

and recycling centre or nearest retail take-back point for reuse and recycling. This document is made of recyclable paper. *22 \ ► Dispose of the documentât the end of the ap- — 4-J pliance's life cycle in accordance with national PAP regulations. 44 I DEL Plus www.stiebel-eltron.comTABLE

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