DHE 18/21/24 - Boiler STIEBEL ELTRON - Free user manual and instructions

USER MANUAL DHE 18/21/24 STIEBEL ELTRON

1.3 Units of measurement 60

2.2 General safety instructions 61

2.4 EU Declaration of Conformity 62

4.3 Selecting the set temperature 64

4.4 Temperature limit via internal anti-scalding

4.10 Recommended settings 70

5. Cleaning, care and maintenance 70

7.1 General safety instructions 72

7.2 Shower operation 72

7.3 Instructions, standards and regulations 72

9.3 Water installation 75

11.2 Initial start-up 82

11.3 Recommissioning 84

13.2 Electrical connection on unfinished walls from below

with short power cable 86

13.3 Electrical connection on finished walls 86

13.4 Connecting a load shedding relay 87

13.5 Water installation on finished walls 87

13.6 Water installation on finished walls with solder/press

13.7 Fitting appliance cover for water installation on

13.8 Lower back panel section installation with threaded

fittings on finished walls 89

13.9 Wall mounting bracket when replacing an appliance 90

13.10 Installation with offset tiles 90

13.11 Rotated appliance cover 91

13.12 Operation with preheated water 91

13.13 Horizontal installation of the appliance 92

17.1 Dimensions and connections 98

17.7 Energy consumption data 101

58 | DHE www.stiebel-eltron.com SPECIAL INFORMATION - The appliance may be used by children over 3years of age and persons with reduced physical, sensory or mental capabilities or a lack of experience and expertise, provided that they are supervised or they have been instructed on how to use the appliance safe- ly and have understood the potential risks. Children must never play with the appliance. Cleaning and user maintenance must not be carried out by children without supervision. - 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, ensure that the inlet temperature does not ex- ceed 55°C. - Ensure the appliance can be separated from the power supply by an isolator that discon- nects all poles with at least 3mm contact separation. - The specified voltage must match the power supply. - The appliance must be connected to the earth conductor.www.stiebel-eltron.com DHE | 59 OPERATION General information ENGLISH - The appliance must be permanently connect- ed to fixed wiring. - Secure the appliance as described in chapter "Installation/ Installation". - Observe the maximum permissible pressure (see chapter "Installation/ Specification/ 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/ Maintenance/ Draining the appliance". OPERATION

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 these instructions to a new user if required.1.1 Safety instructions1.1.1 Structure of safety instructions

KEYWORD Type of riskHere, possible consequences are listed that may result from failure to observe the safety instructions. Steps to prevent the risk are listed.OPERATION General information 60 | DHE www.stiebel-eltron.com1.1.2 Symbols, type of riskSymbol Type of risk

Burns(burns, scalding) 1.1.3 KeywordsKEYWORD MeaningDANGER Failure to observe this information will result in serious injury or death.WARNING Failure to observe this information may result in serious injury or death.CAUTION Failure to observe this information may result in non-seri-ous or minor injury.

1.2 Other symbols in this documentation

Note General information is identified by the adjacent symbol. Read these texts carefully.Symbol Meaning

Material losses(appliance damage, consequential losses and 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 otherwise stated.

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 excess of 43°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. 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 (e.g. ZTA3/4).OPERATION Appliance description 62 | DHE www.stiebel-eltron.com

WARNING InjuryThe appliance may be used by children over 3years of age and persons with reduced physical, sensory or men-tal capabilities or a lack of experience and expertise, 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. Cleaning and user maintenance must not be carried out by children without supervision.

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

See type plate on the appliance.

2.4 EU Declaration of Conformity

Note DHE: STIEBELELTRON hereby declares that the radio equipment type complies with Directive 2014/53/EU. The full text of the EU Declaration of Conformity 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 instantaneous water heater with full electronic control and automatic output matching maintains a consistent outlet tempera-ture. The fully electronic control unit with motorised valve ensures the water is accurately heated to the selected temperature. This occurs regardless of the inlet temperature.If the appliance is operated with preheated water and the inlet temperature exceeds the selected temperature, the inlet tempera-ture is indicated on the second display line and flashes. The water is not heated further.You can store different set temperatures and call them up quickly. In the ECO function, the integral motorised valve limits the flow rate to 3preset levels. The appliance has setting options for a temperature limit (Tmax function, user) and internal anti-scald-ing protection (qualified contractor). The backlight switches on automatically as soon as water starts to flow through the appli-ance or you make a change on the user interface. The backlight switches off automatically after water stops flowing or if no action is performed.www.stiebel-eltron.com DHE | 63 OPERATION Settings and displays ENGLISH 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 heating output for one minute to protect the heating system.

The symbols are shown on the display when activated.

D0000073618 1 Wellness showers 2 Automatic water volume control 3 ECO display 4 Tmax, displayed when temperature limit is enabled 5 Consumption indicator 6 Time 7 Operating lock [ON/ OFF] 8 Spanner symbol, appears in the event of a fault

4.3 Selecting the set temperature

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.www.stiebel-eltron.com DHE | 65 OPERATION Settings and displays ENGLISH When supplying a shower, the appliance temperature setting range must be adjusted by the qualified contractor to 55°C or less. If the anti-scalding protection function is enabled and the tem- perature limit is reached, "Tmax" flashes.

4.5 Temperature limit Tmax (user)

You can adjust the temperature limit individually. If the tempera- ture limit is enabled, "Tmax" is shown on the display.

4.5.1 Activating/deactivating the temperature limit Tmax

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

4.7 Inlet temperature information

If the appliance is operated with preheated water and the inlet temperature exceeds the selected set temperature, the inlet tem- perature is indicated on the second display line and flashes. The water is not heated further.

The appliance has an additional display where consumption values can be shown.

4.8.1 Calling up the info menu

Briefly press "i" until "i1" appears, then continue to press "i" to see further menus. Exit the menu item by pressing "i" and holding for more than 5seconds. Alternatively: The system exits the menu item au- tomatically 30seconds after the setting has been completed. Menu Description Explanations Screen | display I1 Flow rate The current flow rate is shown. Flow rate in l/min or gpm I2 Time The current time is shown. Time

Energy consump- tion The amount of en- ergy consumed is shown. Value in kWh I4 Water consump- tion The amount of water consumed is shown. Value in m³ or gal Note The consumption values are calculated starting from the last reset.OPERATION Settings and displays 66 | DHE www.stiebel-eltron.com

Briefly press and hold "i" for more than 5seconds until "P1" appears, then continue by briefly pressing "i". In the selected parameter menu, turn the temperature selec- tor to the required display/ setting.

ECO water and energy saving function

The ECO function enables you to limit the flow rate to a maximum value. Flow rate limit: 8l/min with "ECO1" | 7l/min with "ECO2" | 6l/min with "ECO3" | No flow rate limit with "OFF".

The temperature limit allows you as a user to restrict the adjustable set temperature at the appliance to a maximum value. Check that the upper temperature limit has been correctly applied. 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.www.stiebel-eltron.com DHE | 67 OPERATION Settings and displays ENGLISH Menu Description Selectable display | setting Explanations Symbol | display

The Wellness shower program lets you choose from 4 different alter- nating shower programs. WW = domestic hot water, KW = cold water, min = minutes, sec = seconds - 1 Cold prevention To strengthen the body, we recommend finishing off with a cold shower; this will trigger a reflex in the body to warm up.

3 min - 2 Winter refreshment An invigorating end to a winter shower with a final warm-up.

3 min 10 sec 10 sec 10 sec 10 sec WW - 10 °C | 50 °F - 3 Summer fitness program A quick contrast shower to increase fitness with a final warm-up.

3 min 10 sec 10 sec 10 sec 10 sec - 4 Circulation boost 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 hot water.

Automatic water volume control – set the volume in the selected unit

With the automatic water volume control, you can preselect a volume of water, e.g. for filling a bathtub. When the preselected water volume is reached, the automatic control reduces the flow rate. The automatic water volume control must be enabled on each occasion prior to fill- ing the bath. Example, filling a bath with 80litres (21gallons): When the bath has been filled with 80litres (21gallons), the control automatically reduc- es the flow rate to 4l/min (1gpm).

You can set the time using the 12 or 24hour clock: - 12hours from 00:00 - 11:59= AM | 11:59 - 00:00= PM - 24hours from 00:00 to 23:59 After a power cut, the time needs to be set again. AM | PM (only for 12h)

Operating lock ON | OFF You can set the operating lock to "ON" or "OFF". To disable the set operating lock: f Press and hold "i" for more than 12seconds. (only when ON) P10

Reset to factory settings

You can restore the appliance to its factory settings. "rSEt" is shown on the display. f Press "1" and "2" simultaneously and hold for longer than 5sec- onds. The display switches to "On" to confirm the reset. f To confirm "On", press and hold "i" for more than 5seconds.

You can reset the consumption values. "rSEt" is shown on the display. f Press "1" and "2" simultaneously and hold for longer than 5sec- onds. The display switches to "On" to confirm the reset. f To confirm "On", press and hold "i" for more than 5seconds.www.stiebel-eltron.com DHE | 69 OPERATION Settings and displays ENGLISH Menu Description Selectable display | setting Explanations Symbol | display P12

You can adjust the display backlight. - If "Auto" is selected, the backlight is switched on during heating operation and each time an action is performed. If no action is per- formed for 30seconds, the backlight is switched off again. - If you select "On", the backlight will remain on constantly.

P13 Reduce backlighting 100% | 20% ( ) You can select 2levels of brightness for the backlight. P14

After installation of a wireless module (with or without paired wire- less remote control) in the appliance, menu item P14 is enabled and "rc" appears on the programming unit display. You can pair one or more wireless remote controls; to do so, follow the pairing procedure on the appliance and the wireless remote control. Pressing "1" on the appliance for longer than 5seconds starts the pairing process, which is shown on the programming unit of the ap- pliance by a progress bar on the display and the operating LED flash- ing. Start the pairing process on the wireless remote control as de- scribed in the relevant operating instructions. After successful pairing, the operating LED on the appliance flashes briefly. An unsuccessful pairing attempt is automatically terminated after 30seconds. Pressing "2" on the appliance for longer than 5seconds unpairs all connected wireless remote controls. During unpairing, "rc0" appears on the display of the programming unit for 5seconds, then "rc" again.

Exit the menu item by pressing "i" and holding for more than 5seconds. Alternatively: The system exits the menu item au- tomatically 30seconds after the setting has been completed.OPERATION Cleaning, care and maintenance 70 | DHE www.stiebel-eltron.com

4.10 Recommended settings

Your instantaneous water heater offers maximum precision and maximum convenience in DHW provision. Should you nonetheless operate the appliance with a thermostatic valve, we recommend 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. Recommended setting for operation with a thermostatic valve and water preheated by solar energy Set the temperature at the appliance to the maximum temperature. 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 recommissioned by taking the follow- ing 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 on the power supply again.

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.www.stiebel-eltron.com DHE | 71 OPERATION Troubleshooting ENGLISH

Problem Cause Remedy The appliance will not start despite the DHW valve being fully open. There is no power. Check the fuses/ MCBs in your fuse box/ distribu- tion board. The aerator in the tap or the shower head is scaled up or dirty. Clean and/or descale the aerator or shower head. The water supply has been interrupted. Vent the appliance and the cold water inlet line. When hot water is being drawn off, cold water flows for a short period. The air sensor is detect- ing air in the water. It briefly switches off the heating output. The appliance restarts automatically after 1minute. The required tempera- ture cannot be set.

The high limit safety cut-out and/or internal anti-scalding protection are enabled. Deactivate the temper- ature limit. The internal anti-scalding protection can only be adjusted by qualified contractors. 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 on the programming unit. The operating lock is enabled. To deactivate the oper- ating lock, press the "i" button for more than 12seconds. 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 enquiry, please provide the serial number from the type plate (000000-0000-000000). Nr. 000000-0000-00000 Nr. 000000-0000-00000 D0000053312INSTALLATION Safety 72 | DHE www.stiebel-eltron.com 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 lossesObserve the maximum inlet temperature. Higher tem-peratures may damage the appliance. You can limit the maximum inlet temperature by installing a central thermostatic valve (see chapter "Appliance description/ Accessories"). WARNING ElectrocutionThis appliance contains capacitors which are discharged when disconnected from the power supply. The capacitor discharge voltage may briefly exceed60VDC.

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 BurnsIf 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 (e.g. ZTA3/4).

7.3 Instructions, standards and regulations

Note Observe all applicable national and regional regulations and instructions. - The IP24/ IP25 protection rating can only be ensured with a correctly fitted cable grommet.www.stiebel-eltron.com DHE | 73 INSTALLATION Appliance description ENGLISH - The electrical resistivity of the water must not fall below that stated on the type plate. In a linked water network, take into consideration the lowest electrical resistivity of the water. Your water supply utility will advise you of the electrical re- sistivity or conductivity of the water in your area.

The following are delivered with the appliance: - Wall mounting bracket - Installation template - 2 twin nipples - 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 with DHE18/21/24)

Wireless remote control - FFB4SetEU Fittings - MEKD mono lever kitchen pressure tap - MEBD mono lever bath pressure tap Water plugs G½A 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 Ø12 mm - Press fitting – copper pipe - Press 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 (G⅜A) at the top of the appliance.INSTALLATION Preparation 74 | DHE www.stiebel-eltron.com Pipe assembly for offset installation Use this pipe assembly if you intend to offset the appliance by up to 90mm downwards from the water connection. 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, suchas electric storage heaters, are being op- erated simultaneously. Central thermostatic valve (ZTA3/4) Use the thermostatic valve for central premixing, for example when operating an instantaneous water heater with preheated water. For use in shower operation, the valve must be set to a maximum of 55°C.

Material losses Install the appliance in a room that is free from the risk of frost. Always install the appliance vertically and near the draw-off point. For horizontal installation, see chapter "Installation alternatives/ Horizontal installation of the appliance". The appliance is suitable for undersink and oversink installation. Undersink installation D0000056242

1 Cold water inlet 2 DHW outlet Note Mount the appliance on the wall. The wall must have sufficient load bearing capacity.

9.2 Minimum clearances

≥50≥50 ≥90 ≥90 D0000060809 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. Fittings 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 inlet to reduce the flow rate. The 3-way ball shut-off valve is intended only to shut off the cold waterinlet.INSTALLATION Installation 76 | DHE www.stiebel-eltron.com 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. If the required flow rate is not achieved when the draw-off valve is fully open, increase the water line pressure.

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

10.1 Standard installation

Opening the appliance D0000053271www.stiebel-eltron.com DHE | 77 INSTALLATION Installation ENGLISH 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. D0000053272 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 D0000059694 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 nipples

Material losses Carry out all water connection and installation work in accordance with regulations.INSTALLATION Installation 78 | DHE www.stiebel-eltron.com

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 nipples.

Material losses The strainer must be fitted for the appliance to function. When replacing an appliance, check whether the strainer is installed. Installing the appliance Note If you are installing the appliance with flexible pipe con- nections, also secure the back panel with a screw. D0000053291

1 Cable entry installation aid 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.www.stiebel-eltron.com DHE | 79 INSTALLATION Installation ENGLISH 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. D0000053274 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.

3 Nm 5 Nm D0000056244 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.INSTALLATION Installation 80 | DHE www.stiebel-eltron.com 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 3mm contact separation. WARNING Electrocution Ensure that the appliance is earthed.

Material losses Observe the type plate. The specified rated voltage must match the power supply. Connect the power cable to the mains terminal. Fitting the lower back panel section D0000053275

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.www.stiebel-eltron.com DHE | 81 INSTALLATION Commissioning ENGLISH

Internal anti-scalding protection via jumper slot

D0000089184 Install the anti-scalding protection setting jumper in the re- quired position (= temperature in °C) on the pin strip. Jumper position Description 43 Forexample 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 (e.g. ZTA3/4).INSTALLATION Commissioning 82 | DHE www.stiebel-eltron.com Changing the connected load via jumper slot; only with DHE18/21/24 If you select a connected load other than the 21kW factory setting for appliances with selectable connected load, you will need to reposition the jumper.

D0000089187 Install the jumper in the required position on the pin strip. Jumper position Connected load 1 18kW 2 21kW 3 24kW No jumper 18kW

11.2 Initial start-up

≥ 60 s D0000053277 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. D0000053278 Activate the safety switch by firmly pressing the reset button (the appliance is delivered with the safety switch disabled).www.stiebel-eltron.com DHE | 83 INSTALLATION Commissioning ENGLISH D0000073198 Connect the programming unit connecting cable to the PCB. Note For undersink installation, the appliance cover should be turned the other way up for easier operation; see chapter "Installation alternatives/ Rotated appliance cover". D0000053280 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 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. D0000053281 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.INSTALLATION Appliance shutdown 84 | DHE www.stiebel-eltron.com

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 recommissioned by taking the follow- ing steps. Disconnect the appliance from the power supply by removing the fuses/tripping the MCBs. Open the tap for at least one minute until the appli- ance and its upstream cold water inlet line are free of air. Switch on the power supply again.

12. Appliance shutdown

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

13. Installation alternatives

Overview of installation alternatives Electrical connection IP ratingOn unfinished walls, connected from above IP25On unfinished walls, connected from below, short power cableIP25 Finished walls IP24Water connection IP ratingFinished walls IP24Other IP ratingInstallation with offset tiles IP25Rotated appliance cover IP25Horizontal installation of the appliance IP24 WARNING Electrocution Before any work on the appliance, disconnect all poles from the power supply.www.stiebel-eltron.com DHE | 85 INSTALLATION Installation alternatives ENGLISH

13.1 Electrical connection from above on unfinished

1 Cable entry installation aid Prepare the power cable. D0000053282

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.INSTALLATION Installation alternatives 86 | DHE www.stiebel-eltron.com

13.2 Electrical connection on unfinished walls from

below with short power cable D0000060387 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 "IP25" and mark the box "IP24". Use a ballpoint pen to do this.

1 Cable grommet Electrical connection on finished walls Dimension APositioned in lower section of appliance 160Positioned in upper section of appliance 110 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.www.stiebel-eltron.com DHE | 87 INSTALLATION Installation alternatives ENGLISH

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 "IP25" and mark the box "IP24". Use a ballpoint pen to do this.

5 Nm 18 NmD0000033104 Fit water plugs with gaskets to seal the concealed connec- tions. All taps obtained as accessories are supplied with plugs and gaskets in the standard delivery. 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.INSTALLATION Installation alternatives 88 | DHE www.stiebel-eltron.com D0000056194

13.6 Water installation on finished walls with

solder/press fittings Note This type of connection changes the IP rating of the ap- pliance. Change the type plate. Cross out "IP25" and mark the box "IP24". Use a ballpoint pen to do this. You can connect copper or plastic pipes with the accessories "sol- der fitting" or "press fitting". With "solder fitting" with threaded fitting for 12mm 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

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.www.stiebel-eltron.com DHE | 89 INSTALLATION Installation alternatives ENGLISH 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. 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.

13.8 Lower back panel section installation with

threaded fittings on finished walls D0000053286

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.INSTALLATION Installation alternatives 90 | DHE www.stiebel-eltron.com

13.9 Wall mounting bracket when replacing an

appliance An existing STIEBELELTRON 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

13.11 Rotated appliance cover

The appliance cover should be turned the other way up for un- dersink installation. D0000073012 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. WARNING Electrocution All 4locking 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. 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.

13.12 Operation with preheated water

You can limit the maximum inlet temperature by installing a cen- tral thermostatic valve.INSTALLATION Installation alternatives 92 | DHE www.stiebel-eltron.com

13.13 Horizontal 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 "IP25" on the type plate and mark the box "IP24". Use a ballpoint pen to do this. 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 "Installation alternatives".

D0000076919 1 Cold water inlet 2 DHW outlet Preparation The appliance cover must be provided with a condensate drain opening of min. ∅5.0mm to max. ∅6.0mm at the marked po- sition.

1 Appliance cover with opening for condensate drain 2 Back panel with additional fixing screwwww.stiebel-eltron.com DHE | 93 INSTALLATION Service information ENGLISH 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.

14. Service information

Overview of connections D0000073174

1 Motorised valve 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 lightsINSTALLATION Troubleshooting 94 | DHE www.stiebel-eltron.com Appliance cover retainer D0000056216

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. Signals of the diagnostic traffic lights (LED) Red Lights up in the event of a fault Yellow Illuminates in heating mode/flashes when output limit reached Green Flashing: Appliance connected to power supplywww.stiebel-eltron.com DHE | 95 INSTALLATION Troubleshooting ENGLISH Diagnostic traffic lights (draw-off mode) Fault Cause Remedy No LED illuminates Appliance does not heat up One or more power supply phases are missing Check the fuses in the distribution board PCB faulty Replace the function module Green flashing, yellow off, red off No DHW Appliance starting flow rate not reached; shower head/aerator scaled up Descale/replace the shower head/aerator Appliance starting flow rate not reached; strainer in cold water inlet dirty Clean strainer Flow meter not plugged in Check plug-in connection; correct if necessary Flow meter faulty or dirty Replace flow meter PCB faulty Replace the function module Green flashing, yellow on, red off No display Loose connecting cable between PCB and program- ming unit Check plug-in connections; correct if necessary Faulty connecting cable between PCB and program- ming unit Check connecting cable; replace if necessary Programming unit faulty Replace programming unit PCB faulty Replace the function module Green flashing, yellow on, red off No DHW; outlet temperature does not match set value Tap faulty Replace tap Outlet sensor faulty Replace outlet sensor Heating system faulty Replace the function module PCB faulty Replace the function module Green flashes, yellow flashes, red off No DHW; outlet temperature does not match set value Motorised valve faulty Replace motorised valve Green flashing, yellow off, red on No DHW One or more power supply phases are missing Check the fuses in the distribution board Air detection has responded Continue draw-off for >1 minINSTALLATION Troubleshooting 96 | DHE www.stiebel-eltron.com

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 "i" button for more than 5seconds. Diagnostic traffic lights (draw-off mode) Display shown Fault Cause Remedy Green flashing, yellow off, red on Spanner flashes (fault code display E1 and spanner) No DHW Safety switch not activated during "Commissioning" Activate the safety switch by firmly pressing the reset button

Safety switch was triggered by high limit safety cut-out Check high limit safety cut-out (plug-in connection, connecting cable); activate safety switch

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 exceed60VDC. Draining the appliance The appliance can be drained for maintenance work. WARNING Burns 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 free from the risk of frost, as water residues remaining inside the appliance can freeze and cause damage. Clean strainer If the strainer in the threaded cold water fitting is dirty, clean it. 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.INSTALLATION Specication 98 | DHE www.stiebel-eltron.com

17.1 Dimensions and connections

1 Power PCB with integral safety switch 2 Bare wire heating system 3 High limit safety cut-out 4 Mains terminal Priority control with 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.INSTALLATION Specication 100 | DHE www.stiebel-eltron.com

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 kW 38°C DHW output in l/min. Rated voltage Cold water inlet temperature 380V 400V 415V 5°C 10°C 15°C 20°C DHE 18/21/24

Conductivity σ≤ Resis- tivity

Conductivity σ≤ Resis- tivity

Fittings Tap pressure drop at a flow rate of 10 l/min Mono lever mixer tap, approx. MPa 0.04 - 0.08 Thermostatic valve, approx. MPa 0.03 - 0.05 Shower head, approx. MPa 0.03 - 0.15 Sizing the pipework When calculating the size of the pipework, an appliance pressure drop of 0.1MPa is recommended.

17.6 Fault conditions

In 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

Manufacturer STIEBEL ELTRON STIEBEL ELTRON Load profile S S Energy efficiency class A A Energy conversion efficiency % 39 39 Annual power consumption kWh 476 475 Default temperature setting °C 60 60 Sound power level dB(A) 15 15 Special information on measuring efficiency Measured at ECO level with highest flow rate, maximum output and maximum set value. Measured at ECO level with highest flow rate and maximum set value Daily power consumption kWh 2,184 2,177INSTALLATION Specication 102 | DHE www.stiebel-eltron.com

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 aect warranties issued by any importers. Environment and recycling We would ask you to help protect the environment. After use, dispose of the various materials in accordance with national regulations. GUARANTEE ENVIRONMENT AND RECYCLINGwww.stiebel-eltron.com DHE | 105 FRANÇAIS

)IP IP 25 IP 25 IP 24 )IP IP 24 )IP IP 25 IP 25 IP 24