STIEBEL ELTRON DEM 6 AU Instruction Manual

Electronically controlled mini instantaneous water heater
» DEM 6 AU
OPERATION AND INSTALLATION

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CONTENTS
SPECIAL INFORMATION
OPERATION
1. General information �����������������������������������������4
1.1 Safety instructions����������������������������������������������� 4
1.2 Other symbols in this documentation ����������������������� 5
1.3 Units of measurement ������������������������������������������ 5
2. Safety����������������������������������������������������������5
2.1 Intended use������������������������������������������������������ 5
2.2 General safety instructions ������������������������������������ 6
2.3 Test symbols ������������������������������������������������������ 6
3. Appliance description ���������������������������������������7
4. Settings �������������������������������������������������������7
5. Cleaning, care and maintenance ���������������������������7
6. Troubleshooting ����������������������������������������������8
INSTALLATION
7. Safety����������������������������������������������������������9
7.1 General safety instructions ������������������������������������ 9
7.2 Instructions, standards and regulations �������������������� 9
8. Appliance description ���������������������������������������9
8.1 Standard delivery������������������������������������������������ 9
8.2 Accessories������������������������������������������������������� 10
9. Preparation ������������������������������������������������� 10
10. Installation�������������������������������������������������� 10
10.1 Installation site�������������������������������������������������� 10
10.2 Alternative installation methods����������������������������� 11
10.3 Making the electrical connection���������������������������� 14
11. Commissioning ��������������������������������������������� 15
11.1 Initial start-up ��������������������������������������������������� 15
11.2 Appliance handover �������������������������������������������� 15
11.3 Recommissioning ����������������������������������������������� 15
11.4 Settings ����������������������������������������������������������� 16
12. Appliance shutdown ��������������������������������������� 18
13. Troubleshooting �������������������������������������������� 18
14. Maintenance ������������������������������������������������ 19
14.1 Draining the appliance ���������������������������������������� 19
14.2 Cleaning the strainer������������������������������������������� 20
14.3 Appliance storage ���������������������������������������������� 20
14.4 Replacing the power cable ����������������������������������� 20
15. Specification ������������������������������������������������ 20
15.1 Dimensions and connections��������������������������������� 20
15.2 Wiring diagram ������������������������������������������������� 21
15.3 Temperature increase������������������������������������������ 21
15.4 Application areas ����������������������������������������������� 22
15.5 Data table �������������������������������������������������������� 23
ENVIRONMENT AND RECYCLING
WARRANTY

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SPECIAL 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. Cleaning and
user maintenance must not be carried out by
children without supervision.
- The tap can reach temperatures of up to 50°C.
There is a risk of scalding at outlet tempera-
tures in excess of 43°C.
- Ensure the appliance can be separated from the
power supply by an isolator that disconnects all
poles with at least 3mm contact separation.
- The specified voltage must match the mains
voltage.
- The appliance must be permanently connected
to fixed wiring.
- The power cable must only be replaced (for
example if damaged) by a qualified contractor
authorised by the manufacturer, using an origi-
nal spare part.
- 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 "In-
stallation/ Specification/ Data table").
- Drain the appliance as described in chap-
ter "Installation/ Maintenance/ Draining the
appliance".

OPERATION
General information
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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 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
(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.
!

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OPERATION
Safety
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 stated oth-
erwise.
2. Safety
2.1 Intended use
This appliance is suitable for heating domestic hot water or for
reheating preheated water. The appliance is designed for one hand
washbasin.
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.
!

OPERATION
Safety
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2.2 General safety instructions
DANGER Burns
The tap can reach temperatures of up to 50°C.
There is a risk of scalding at outlet temperatures in ex-
cess of 43°C.
!
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. Cleaning and user maintenance must
not be carried out by children without supervision.
!
WARNING
For continued safety of this appliance it must be in-
stalled, operated and maintained in accordance with
the manufacturer’s instructions.
DANGER Electrocution
Any damaged power cables must be replaced by a qual-
ified electrician. This prevents potential hazards from
arising.
!
Material losses
Protect the appliance and tap against frost.
!
Material losses
Prevent scale build-up at the tap outlets (see chapter
"Operation/ Cleaning, care and maintenance").
2.3 Test symbols
See type plate on the appliance.
Information for Australia/New Zealand:
Installation shall comply with standard AS/NZS 3500.4

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OPERATION
Appliance description
3. Appliance description
The electronically controlled mini instantaneous water heater
maintains a constant outlet temperature up to its output limit,
irrespective of the inlet temperature.
This appliance has been factory-set to the outlet temperature
required for washing hands. Once this temperature has been
reached, the PCB automatically reduces the output. The output is
matched to the required temperature, this prevents the temper-
ature being exceeded.
The appliance heats the water directly at the draw-off point as
soon as the tap is opened. The short pipe runs ensure that energy
and water losses are minimal.
The DHW output depends on the cold water temperature, the heat-
ing output and the flow rate.
The bare wire heating system is suitable for hard and soft water
areas. This heating system has a low susceptibility to scale build-
up. The heating system ensures quick and efficient DHW provision
at the hand washbasin.
Your qualified contractor can adjust the maximum temperature
and flow rate (see chapter "Installation/ Commissioning/ Set-
tings").
4. Settings
The appliance heating system switches on automatically as soon
as you open the DHW valve at the tap or activate the sensor of a
sensor tap. The water is heated. The water temperature can be
adjusted at the tap.
For initial flow rate and flow rate limiting, see chapter "Installa-
tion/ Specification".
Following an interruption to the water supply
See chapter "Installation/ Commissioning/ Restarting".
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.
 Have the electrical safety of the appliance regularly checked
by a qualified contractor.
 Regularly descale or replace the aerator.

OPERATION
Troubleshooting
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6. Troubleshooting
Problem Cause Remedy
The appliance will not
start despite the DHW
valve being fully open.
No power at the appli-
ance.
Check the fuse/MCB in
your fuse box/distribu-
tion board.
The aerator in the tap is
scaled up or dirty.
Clean and/or descale the
aerator or replace the
aerator.
The water supply has
been interrupted.
Vent the appliance and
the cold water inlet line
(see chapter "Settings").
The required tempera-
ture is not being reached.
The maximum tempera-
ture set inside the appli-
ance is too low.
Have your qualified con-
tractor adjust the maxi-
mum temperature.
The appliance has
reached its output limit.
Reduce the flow rate.
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).
DEM . . No.: 000000-0000-000000

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INSTALLATION
Safety
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.
!
Material losses
Observe the max. permissible inlet temperature. Higher
temperatures may damage the appliance. You can limit
the inlet temperature by installing a central thermostatic
valve.
WARNING Electrocution
This appliance contains capacitors which are discharged
when disconnected from the power supply. The capacitor
discharge voltage may briefly reach >34VDC.
7.2 Instructions, standards and regulations
Note
Observe all applicable national and regional regulations
and instructions.
The specific electrical resistance of the water used must not fall
below that stated on the type plate. In a linked water network,
factor in the lowest electrical resistance of the water (see chapter
"Installation/ Specification/ Data table"). Your water supply utility
will advise you of the electrical resistivity or conductivity of the
water in your area.
8. Appliance description
8.1 Standard delivery
The following are delivered with the appliance:
- Sieve inside the cold water inlet
- 2 reducers 1/2 to 3/8 incl. flat gaskets
- Connection hose 1/2, 500mm long, with gaskets*
- Tee 1/2*
- Company logo for oversink installation
*for the connection as pressure-tested appliance

INSTALLATION
Preparation
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8.2 Accessories
Pressure-tested tap
- WSH20AU - Sensor tap for washbasins
9. Preparation
 Flush the water line thoroughly.
Water installation
No safety valve is required.
Taps
 Use suitable taps.
10. Installation
10.1 Installation site
Install the appliance in a room free from the risk of frost and near
the draw-off tap.
Ensure that the lateral fixing screws for the cover are always ac-
cessible.
The appliance is suitable for undersink installation (water con-
nections at the top) and oversink installation (water connections
at the bottom).
DANGER Electrocution
The adjusting screw for setting the flow rate is 'live', and
the IP 25 protection is only given when the appliance
back panel is fitted.
 Always fit the appliance back panel.

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INSTALLATION
Installation
10.2 Alternative installation methods
10.2.1 Undersink installation
Pressure-tested, with pressure-tested tap
D0000086682
Non-pressurised, with non-pressurised tap
26�02�05�0080

INSTALLATION
Installation
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Appliance installation
Note
 Mount the appliance on the wall. The wall must have
sufficient load bearing capacity.



26�02�05�0083
 Undo the cover fixing screws by two turns.
 Undo the snap fastener using a screwdriver.
 Remove the appliance cover with the heater towards the
front.
 Using pliers, break out the knock-out for the power cable
in the appliance cover. Correct the contours with a file if
necessary.


26�02�05�0084
 Use the appliance back panel as a drilling template.
 Secure the appliance back panel to the wall with suitable
rawl plugs and screws.

ENGLISH
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INSTALLATION
Installation



26�02�05�0085
 Route the power cable through the cable entry in the back
panel.
 Hook in the appliance cover with the heater at the bottom.
 Click the heater into place using the snap fastener.
 Secure the appliance cover with the cover fixing screws.
D0000086818
 Screw the reducers supplied, incl. flat gaskets, onto the ap-
pliance water connections.
Tap installation
!
Material losses
 When making the connections, counter the torque
on the appliance using a size 14 spanner.
Pressure-tested tap
 Fit the 1/2 connection hose provided and the 1/2 tee (see
chapter "Installation/ Alternative installation methods/ Un-
dersink installation").
 Install the tap. For this, also observe the tap operating and
installation instructions.
Non-pressurised tap
 Install the tap. For this, also observe the tap operating and
installation instructions.

INSTALLATION
Installation
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10.2.2 Oversink installation, non-pressurised, with non-
pressurised tap
26�02�05�0081�
Tap installation
 Install the tap. For this, also observe the tap operating and
installation instructions.
!
Material losses
 When making the connections, counter the torque
on the appliance using a size 14 spanner.
Appliance installation
 Fit the appliance to the tap with the water connections.
10.3 Making the electrical connection
DANGER Electrocution
Carry out all electrical connection and installation work
in accordance with relevant regulations.
DANGER Electrocution
Ensure that the appliance is earthed.
Ensure the appliance can be separated from the power
supply by an isolator that disconnects all poles with at
least 3mm contact separation.
DANGER Electrocution
The appliances are delivered with a power cable.
Connection to a permanent power supply is possible,
provided the fixed cable has a cross-section that is at
least equal to that of the standard power cable of the
appliance. A maximum cross-section of 3x6mm² may
be used.
 If the appliance is installed over the sink, route the
power cable behind the appliance.

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INSTALLATION
Commissioning
!
Material losses
Observe the type plate. The specified voltage must match
the mains voltage.
 Connect the power cable as shown in the wiring diagram
(see chapter "Installation/ Specification/ Wiring diagram").
11. Commissioning
11.1 Initial start-up
26�02�05�0087
 Fill the appliance by running the tap several times until the
pipework and appliance are free of air.
 Carry out a tightness check.
 Switch on the power supply.
 Check the appliance function.
 In the case of oversink installation, affix the company logo
supplied over the existing company logo.
11.2 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.
11.3 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.
 Switch OFF the power supply to isolate the appliance
across all poles.
 Open the tap for at least one minute until the appli-
ance and its upstream cold water inlet line are free
of air.
 Switch the power back ON.

INSTALLATION
Commissioning
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11.4 Settings
You can alter the maximum flow rate and temperature.
DANGER Electrocution
The flow rate and temperature may only be adjusted if
the appliance is isolated from the power supply.
 Isolate all poles of the appliance from the power supply.
DANGER Electrocution
The adjusting screw for changing the flow rate and the
potentiometer for setting the temperature are live if the
appliance has not been isolated from the power supply.
26�02�05�0076�
 Remove the appliance cover.

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INSTALLATION
Commissioning
Setting the maximum temperature
Factory setting: 38°C
30°C
38°C
50°C
D0000042035
 Using a screwdriver, set the potentiometer to the maximum
required temperature.
 Fit the appliance cover.
Limiting the flow rate
Factory setting: Maximum flow rate
26�02�05�0079�
 Using the adjusting screw, set the maximum required flow
rate:
- Lowest flow rate = wind the screw in as far as it will go.
- Highest flow rate = wind the screw out as far as it will go.
 Fit the appliance cover.

INSTALLATION
Appliance shutdown
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12. Appliance shutdown
 Switch OFF the power supply to isolate the appliance across
all poles.
 Drain the appliance (see chapter "Installation/
Maintenance").
13. Troubleshooting
Problem Cause Remedy
The appliance will not
start despite the DHW
valve being fully open.
The aerator in the tap is
scaled up or dirty.
Clean and/or descale the
aerator or replace the
aerator.
The flow rate is set too
low.
Increase the flow rate.
The sieve in the cold
water line is blocked.
Clean the sieve after
shutting off the cold
water inlet line.
The heating system is
faulty.
Check the resistance of
the heating system and
replace the appliance if
required.
The safety pressure limit-
er has responded.
Remedy the cause of
the fault. Isolate the ap-
pliance from the power
supply and depressurise
the water line. Activate
the safety pressure
limiter.
The required tempera-
ture is not being reached.
The yellow indicator
flashes.
The appliance has
reached its output limit.
Reduce the flow rate.
LED indicators
26�02�05�0082�
321
1 Illuminates red in the case of a fault
2 Indicator yellow in heating mode / flashing when the output
limit is exceeded
3 Flashes green if the PCB is receiving power

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INSTALLATION
Maintenance
Activating the safety pressure limiter
D0000086673
1
1 1-pole safety pressure limiter
14. Maintenance
DANGER Electrocution
Before performing any work on the appliance, discon-
nect all poles from the power supply.
14.1 Draining the appliance
DANGER Scalding
Hot water may escape when you drain the appliance.
If the appliance needs to be drained for maintenance or to protect
the whole installation when there is a risk of frost, proceed as
follows:
 Close the shut-off valve in the cold water inlet line.
 Open the draw-off valve.
 Undo the water connections on the appliance.

INSTALLATION
Specication
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14.2 Cleaning the strainer
You can clean the fitted strainer after removing the cold water
supply pipe and the reducer.
26�02�05�0065�
14.3 Appliance storage
 Store the dismantled appliance free from the risk of frost, as
water residues remaining inside the appliance can freeze and
cause damage.
14.4 Replacing the power cable
 If making a replacement, use a 4mm² connecting cable.
15. Specification
15.1 Dimensions and connections
95
28
30
120
143
190
4,8
165
82
20
b02
b03
c06
c01
D0000018336
DEM AU
b02 Entry for electrical cables I
b03 Entry electrical cables II
c01 Cold water inlet Male thread G 3/8 A*
c06 DHW outlet Male thread G 3/8 A*
* Reducer G 1/2 to G 3/8 included in standard delivery