STIEBEL ELTRON PEO 18 Veto Comfort Instantaneous Water Heaters Instruction Manual

OPERATION AND INSTALLATION
Electronically controlled comfort instantaneous water heater
» PEO 18/21/24
**» PEO 27

**

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.
– The tap can reach temperatures of up to 60 °C. There is a risk of scalding at outlet tem- peratures 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 oper- ation, the qualified contractor must activate the temperature setting range using the temperature limit (Tred = 55 °C) in the appli- ance. When using preheated water, it must be ensured that the inlet 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 / Installation”.
– Observe the maximum permissible pressure {see chapter “Installation / Specification / Data table”).
OPERATION

General information

– 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”.] 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

(burns, sca d’ng)

1.1.3 Keywords

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- bus or minor injury.

**Safety

**

1.2 Other symbols in this documentation
Note General information is identified by the adjacent symbol.
► Read these texts carefully.

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.
2. Safety
2.1 Intended use This pressurised appliance is suitable for heating domestic hot water or for reheating preheated water. The appliance can supply one or more draw-off points. 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 The tap can reach temperatures of up to 60 °C. There is a risk of scalding at outlet temperatures in excess of 1,3 °C.
CAUTION Burns L(C If operating with preheated water, e.g. from a solar ther-mal system, the DHW temperature may vary from the selected set temperature.
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.
Where children or persons with limited physical, sensory or men-tal abilities are allowed to use this appliance, we recommend a permanent temperature limit. A qualified contractor can set the limit for you.
Material losses**
The user should protect the appliance and its tap against frost.
23 Test symbols See type plate on the appliance

 Appliance description

The electronically controlled instantaneous water heater with au-tomatic output matching keeps the outlet temperature constant up to the output limit. The temperature is then adjusted via the d raw-off tap.
Heating system the bare wire heating system has a pressure-tested plastic cas- ing. The heating system is suitable for hard and soft water areas and is largely insusceptible to scale build-up. This heating system ensures rapid and efficient DHW availability.
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.

Settings

The DHW outlet temperature can be variably adjusted. The se- lected temperature is displayed. At temperatures over 43 °C, the colour of the display changes from blue to red to indicate a risk of scalding.

» Turn the temperature selector to the required temperature.
Note
If the outlet temperature is not sufficiently high when the draw-off valve is fully open and the temperature selector is set to maximum, then more water is flowing through the appliance than can be heated by the heating system (appliance is at its output limit).
» Reduce the water volume at the draw- off valve.
4&1 Recommended settings
Thermostatic valve
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.
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 temoving the fuses/tripping the MCBs.
» Open the tap for one minute until the appliance and its upstream cold water inlet line are free of air.

Switch the mains power back on again.

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.

Trobleshooting

The flow rate is too low. The aerator in the tap or the shower head is scaled up or dirty.| Clean and/or descale the aerator or shower head.
Required temperature > 45 °C is not achieved.| The water supply has been interrupted.| Vent the appliance and the cold water inlet line (see chapter “Settings”).
The cold water inlet tem-perature is > 45 °C.| Reduce the cold water inlet temperature.

If you cannot remedy the fault, notify your qualified contractor.
To facilitate and speed up your enquiry, please provide the serial number from the type plate (000000-0000-00000}.

INSTALLATION
7. Safety 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.
Flow pressure If the flow rate is insufficient to switch on the appliance even when the tap is open. remove the flow limiter and replace it with the plastic profile washer supplied.
If required, the pressure in the water installation can also be raised.
Note For the thermostatic valve to function correctly, the flow limiter for this valve must not be replaced with the plastic profile washer.
Material losses
Observe the maximum inlet temperature. Higher 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 reach > 60 V DC.
7.2 Shower operation
CAUTION Burns ► If supplying a shower, set the internal temperature limit to “Tred”; see chapter “Installation alterna-tives / Temperature limit”.
CAUTION Burns If the water supplied to the appliance is preheated. please note the following: The internally adjustable temperature limit may be ex- ceeded.
7.3 Instructions, standards and regulations
Note Observe all applicable national and regional regulations and instructions.
• The IP 25 (hoseproof) rating can only be ensured with a cor-redly 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. observe the lowest electrical water resistivity (see chapter ‘Specification / Application areas / Conversion table). Your water supply utility will advise you of the specif-ic electrical water resistivity or conductivity.

Appliance description

8.1 Standard delivery
The following are delivered with the appliance: – Wall mounting bracket – Threaded stud for wall mounting – Installation template – 2 twin connectors (cold water with shut-off valve) – Flat gaskets – Cable grommet (power cable from above / below)
Screws! rawl plugs for securing the back panel to allow for water connection on finished walls For appliance replacement: – nap extensions

Preparation

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. The appliance is suitable for undersink and oversink installation.
Undersink installation

1. Cold water intet
2. DHW outlet

Installation

Oveniek installeties

I Cold water inlet 2 Mai outlet
Note ► Mount the appliance on the wall. The wall must ha.- sufficient load bearing capacity.
9.2 Water installation
– No safety valve is required. Safety vakes are not permissible in the 011W pipe.
► Flush the water line thoroughly.
► Ensure that the flow rate for switching on the appliance is achieved bee chapter ‘Specification 1 Data table. On). If the flow rate Is not achieved. remove the flow limiter (see chap-ter ‘Installation / Removing the Now limiter’ I.
► Increase the mains water pressured the required Dow rate is not achieved with the draw-off valve fully opened.
Taps Use appropriate Venom taps. Open vented Ws are not per missibk.
in Note Never use the shut-off valve in the cold water inlet to reduce the flow rate. It is intended for shutting off the appliance.
Permissible water line materials
• Coid water inlet pipe: Pipes made from galvanised steel, stainless steel, copper or plastic DIMY outlet line: Pipes made from stainless steel, copper or plastic
0 Material losses If plastic pipework systems are used, take into account the maximum inlet temperature and the maximum pres-sure (see chapter ‘Specihcat’on 1 Data table’)
flexible water connection lines
► If the appliance is installed with flexible water connection lines. ensure that the pipe bends with bayonet fittings do not become twisted inside the appliance.
► Secure the back panel at the bottom with two additional screws.

Installation

10.1 Standard installation Flew cal connection from above; imtallation on unfinished walls Water connection on unfinished walls PEO 18121124: Medium connected load is selected  further installation options. see chapter ‘Alternative instal-anon methods’: Electrical connection from below on unfinished walls Electrical connection on finished walls Connecting a load shedding relay Water installation on finished walls Water connection on unfinished walls for appliance replacement Operation with preheated water Temperature limit
Opening the appliance

► Open the appbance by releasing the snap lock. ► Remove the back panel by pressing the two locking tabs and pulling the lower section of the back panel forwards.
Preparing the power cable **Fitting the wall mounting bracket ► Mark out the holes for drilling using the installation tern-plate. If the appliance is to be installed with water connec-tions on finished walls, also mark out the fixing holes in the lower part of the template.
► Drill the holes and secure the wall mounting bracket with 2 screws and 2 rawl plugs (screws and rawl plugs are not part of the standard delivery).
► Fit the threaded stud provided.
► Fit the wall mounting bracket.
Fitting the cable grommet
► Fit the cable grommet. For connecting cables > 6 mmk, en-large the hole in the cable grommet.
Making the water connection
Material losses Carry out all water connection and installation work in accordance with regulations.
► Seal and insert the twin connectors.
Material losses Never use the shut-off valve in the cold water inlet to reduce the flow rate.
Preparing the back panel**
Material losses If you break open the wrong knock-out in the back panel by mistake, you must use a new back panel.
► Break out the cable grommet knock-out in the back panel. Deburr any sharp edges with a file if necessary.

Installing the appliance

► Push the back panel over the threaded stud and the cable grommet. Pull the cable grommet by the locking hooks into the back panel using pliers. until both locking hooks audibly click into place.
► Remove the protective transport plugs from the water connections.
► Press the back panel firmly into place and lock the fixing tog-gle by turning it clockwise through 90°.

Screw the water connection pipes with flat gaskets onto the twin connectors.
Material losses
The strainer must be fitted for the appliance to function.
► When replacing an appliance, check whether the strainer is installed (see chapter “Maintenance-).
Removing the flow limiter
0 Material losses If you use a thermostatic valve, the flow limiter must not be removed.
Plastic profile washer 2 Flow limiter
► Remove the flow limiter and refit the plastic profile washer.
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 voltage must match the mains voltage.
► Connect the power cable to the mains terminal (see chapter “Specification! Wiring diagram’).
PEO 18/21/24: Re-plugging the coding card
In its delivered condition, the appliance is set to 21 kW. When changing to a different connected load, carry out the following steps: ► Re-plug the coding card according to the selected connected load (for selectable connected load and fuse protection of the appliance, see “Specification / Data table”).
► Tick the selected connected load on the type plate. Use a ballpoint pen to do this.
Fitting the base pad of the back panel ► Position the lower back panel on the main back panel and click it into place.
► 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 is not flush with the wall, the appliance can be secured at the bottom with two additional screws.
10.2 Alternative installation methods
10.2.1 Electrical connection from below on unfinished walls
► Fit the cable grommet.
Material losses
If you break open the wrong knock-out in the back panel by mistake, you must use a new back panel.
► Break out the cable grommet knock-out in the back panel. Deburr any sharp edges with a file if necessary.
► Reposition the mains terminal in the appliance from the top to the bottom.
► Push the back panel over the threaded stud and the cable grommet. Pull the cable grommet by the locking hooks into the back panel using pliers, until both locking hooks audibly click into place.
► Press the back panel firmly into place and lock the fixing tog-gle by turning it clockwise through 90°.
10.2.2 Electrical connection on finished walls
:1 Note This type ol connection changes the 11, rating of the so pliance.
► Change the type plate. Cross oul ‘IP 25″ and mark the box ‘IP 24’. Use a ballpoint pen to do this
Material losses
If you break open the wrong knock-out in the back panel by mistake, you must use a new back panel.
► Cleanly cut or break out the required cable entries in the hack panel llor positions. see chapter ‘Specification r Dimen-SODS and connedionc). Detwrr any sharp edges with a file if necessary.
► Route the power cable through the cable grommet and confled it to the mains terminal.
10.2.1 Connecting a load shedding relay
When operating additional electric appliances. such as electric storage healers, install a load shedding relay in the distribution board. 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’).
10.2.4 Water installation en finished walls
in Note This type ol connection changes the IP rating of the ap-pliance. ► Changethe 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 connections.
► Fit a suitable pressure tap.

► Secure the back panel at the bottom with two additional screws.
► Slide the lower back panel under the connection pipes of the tap and click the lower back panel into place.
► Stole the connection pipes to the appliance.
Material losses
If you break open the wrong knock-out in the appliance corer by mistake. you must use a new appliance cover.
► Cleanly break out the knock-outs in the appliance cover. De-burr any sharp edges with a file if necessary.
11.7.5 Water installation an unfinished walls for appliance replacement If the existing twin connectors of the old enchante only protrude from the wall by approx. 16 mm, you cannot use the twin con-nectors provided.
** Note
With this connection. the cold water supply can only be shut off within the domestic installation.
► Seal and fit the screw-in tap extensions provided.
► Connect the appliance.
10.2.6 Operation with preheated water
You can limit the maximum inlet temperature by installing a cen tra I thermostatic valve.
10.2.7 Temperature limit* Position Tree (55 °C): Temperature limit 2 Position ‘Tmax”: No temperature limit, for temperature set-ting range, see chapter ‘Specification / Data table’.
► Remove the appliance cover.
► Slide the switch to the required position.
► Fit the appliance cover.
CAUTION Burns When operating with preheated water, the set temper-ature limit may be ineffective.
► In this case, limit the temperature at the upstream central thermostatic valve.
10.3 Completing the installation
► Open the shut-off valve in the twin connector or the cold water inlet line.

Commissioning

WARNING Electrocution Commissioning must only be carried out by a qualified contractor in accordance with safety regulations.
11.1 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 pressure limiter by firmly pressing the reset button (the appliance is delivered with the safety pres-sure limiter deactivated).
► Plug the temperature selector cable plug into the PCB.
► Fit the appliance cover, ensuring it clicks into place. Check that the appliance cover is seated correctly.
► Switch the power supply ON.
► Check the appliance function.
Appliance shutdown
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 these instructions.
11.2 Recommissioning Vent the appliance and the cold water inlet line (see chapter “Set-tings'(. See chapter “Initial start-up’.

Appliance shutdown

► Isolate all poles of the appliance from the power supply.
► Drain the appliance (see chapter “Maintenance-).

Troubleshooting

WARNING Electrocution To test the appliance, it must be supplied with power.
Indicator options for diagnostic traffic light (LED)
Red :n the event al a fain: ‘le ow Illuminates during hea:’ng operation Green F ashing: Appliance connected to power SuOP Y
1 Diagnostic traffic light

Maintenance

WARNING Electrocution / 7 Before any work on the appliance, disconnect all poles from the power supply.
Draining the appliance The appliance can be drained for maintenance work.
WARNING Burns Hot water may escape when draining the appliance.
► Close the shut-off valve in the twin connector or the cold water inlet line.
► Open all draw-off valves. IP. Undo the water connections on 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 shut-off valve in the cold water inlet line before removing, cleaning and refitting the strainer.

Specification

15.1 Dimensions and connections

Alternative connection options

Specification

15.2 Wiring diagram
3/PE – 380-415 V
1 Heating 2 High limit safety cut out 3 Safety pressure limiter
Priority control with LR 1-A
1 Control cable to the contactor of the 2nd appliance (e.g. elec-tric storage heater). 2 Control contact drops out when switching the instantaneous water heater on.
15.3 DHW output The DHW output is subject to the mains voltage, the appliance’s connected load and the cold water inlet temperature. The rated voltage and rated output can be found on the type plate (see chapter “Troubleshooting”).

15.4 Application areas / Conversion table Specific electrical resistivity and specific electrical conductivity (see chapter Data table”).

15.5 Pressure drop

Sizing the pipework When calculating the size of the pipework, an appliance pressure drop of 0.1 MPa is recommended.
15.6 Fault conditions
In the event of a fault, loads up to a maximum of 95 °C at a pres-sure of 1.2 MPa can occur temporarily in the installation.

Specification

15.7 Energy consumption data
Product datasheet: Conventional water heaters to regulation (EU) no. 812/2013 and 814/2013 / (S.|. 2019 No. 539 / Schedule 2) 15.8 Data table

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 We would ask you to help protect the environment. After use, dispose of the various materials in accordance with national regulations.

United Kingdom and Ireland
Subject to errors and technical changes!
STIEBEL ELTRON UK Ltd.
Unit 12 Stadium Court
Stadium Road | CH62 3RP Bromborough
Tel. 0151 346-2300 | Fax 0151 334-2913
info@stiebel-eltron.co.uk
www.stiebel-eltron.co.uk
United States of America
STIEBEL ELTRON, Inc.
17 West Street | 010883 West Hatfield MA
Tel. 0413 247-3380 | Fax 0413 247-3369
info@stiebel-eltron-usa.com
www.stiebel-eltron-usa.com

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>