STIEBEL ELTRON DHC 3 Instruction Manual

BEDIENUNG UND INSTALLATION
OPERATION AND INSTALLATION
UTILISATION ET INSTALLATION
OPERACIÓN E INSTALACIÓN
OBSŁUGA I INSTALACJA


Hydraulisch gesteuerter Kleindurchlauferhitzer | Hydraulically controlled small
instantaneous water heater | Petit chauffe-eau instantané à commande hydraulique|
Minicalentador de control hidráulico | Hydraulicznie sterowany mały ogrzewacz
przepływowy | Компактный проточный нагреватель с гидравлическим управлением |

» DHC 3
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CONTENTS |SPECIAL INFORMATION
SPECIAL INFORMATION
OPERATION
1. General information ��������������������������������������� 17
1.1 Safety instructions���������������������������������������������� 17
1.2 Other symbols in this documentation ���������������������� 17
1.3 Units of measurement ����������������������������������������� 17
2. Safety�������������������������������������������������������� 17
2.1 Intended use����������������������������������������������������� 17
2.2 General safety instructions ����������������������������������� 17
2.3 Test symbols ����������������������������������������������������� 17
3. Appliance description ������������������������������������� 18
4. Settings ����������������������������������������������������� 18
5. Cleaning, care and maintenance ������������������������� 18
6. Troubleshooting �������������������������������������������� 18
INSTALLATION
7. Safety�������������������������������������������������������� 19
7.1 General safety instructions ����������������������������������� 19
7.2 Instructions, standards and regulations ������������������� 19
8. Appliance description ������������������������������������� 19
8.1 Standard delivery����������������������������������������������� 19
8.2 Accessories������������������������������������������������������� 19
9. Preparations������������������������������������������������ 19
9.1 Installation site�������������������������������������������������� 19
9.2 Factory settings ������������������������������������������������� 20
10. Installation�������������������������������������������������� 20
10.1 Alternative installation options only for DHC 3, DHC 4,
DHC6, DHC 8 ���������������������������������������������������� 21
10.2 Completing the installation����������������������������������� 22
11. Commissioning ��������������������������������������������� 23
11.1 Commissioning�������������������������������������������������� 23
11.2 Recommissioning����������������������������������������������� 23
12. Shutting down���������������������������������������������� 23
13. Troubleshooting �������������������������������������������� 23
14. Maintenance ������������������������������������������������ 23
15. Specification ������������������������������������������������ 24
15.1 Dimensions and connections��������������������������������� 24
15.2 Wiring diagram ������������������������������������������������� 25
15.3 Increasing the temperature����������������������������������� 25
15.4 Application areas ����������������������������������������������� 26
15.5 Details on energy consumption������������������������������ 26
15.6 Data table �������������������������������������������������������� 27
GUARANTEE
ENVIRONMENT AND RECYCLING
INSTALLATION TEMPLATE (IN THE CENTRE SECTION OF THESE
INSTRUCTIONS)
SPECIAL INFORMATION
- The appliance may be used by children aged 8
and up and persons with reduced physical, sen-
sory or mental capabilities or a lack of experience
and know-how, provided that they are supervised
or they have been instructed on how to use the
appliance safely and have understood the result-
ing risks. Children must never play with the ap-
pliance. Children must never clean the appliance
or perform user maintenance unless they are
supervised.
- Risk of scalding: The tap can reach temperatures
in excess of 60°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.
- Secure the appliance as described in chapter “In-
stallation/ Installation”.
- Observe the maximum permissible pressure (see
chapter “Specification/ Data table”).
- Drain the appliance as described in chap-
ter “Installation/ Maintenance/ Draining the
appliance”.

OPERATION
General information
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ENGLISH
OPERATION
1. General information
The chapters “Special Information” and “Operation” are intended
for both the user 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.
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
The appliance is intended for heating domestic hot water and can
supply one or several draw-off points.
This appliance is intended for domestic use. It can be used safely
by untrained persons. The appliance can also be used in a non-do-
mestic environment, e.g. in a small business, as long as it is used
in the same way.
Any other use beyond that described shall be deemed inappropri-
ate. Observation of these instructions and of instructions for any
accessories used is also part of the correct use of this appliance.
2.2 General safety instructions
CAUTION Scalding
During operation, the tap can reach temperatures in ex-
cess of 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 8 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 resulting risks. Children must never play
with the appliance. Children must never clean the ap-
pliance or perform user maintenance unless they are
supervised.
!
Material losses
The user should protect the appliance and its tap against
frost.
2.3 Test symbols
See type plate on the appliance
!
!

OPERATION
Appliance description
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3. Appliance description
The hydraulically controlled small instantaneous water heater is
switched on automatically by the hydraulic control unit.
The appliance heats the water directly at the draw-off point as
and when required. 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 tubular heater system is suitable for soft water areas.
The appliance is equipped with overheating protection.
4. Settings
The heating system of the appliance starts automatically and heats
the water as soon as you open the DHW valve at the tap.
For appliance start-up volume, see chapter “Specification”.
12
26�02�02�0229�
1 Power indicator
2 Overheating indicator
Note
In the event of the appliance overheating, the overheating
indicator illuminates.
The water temperature can be adjusted at the tap:
Increasing the temperature
 Reduce the flow rate at the tap.
Reducing the temperature
 Open the tap further or add more cold water.
Following an interruption to the water supply
See chapter “Commissioning/ Recommissioning”.
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 an electrician.
6. Troubleshooting
Problem Cause Remedy
The appliance will not
start despite the DHW
valve being fully open.
There is no mains volt-
age at the appliance.
Check the fuse/MCB in
your fuse box/distribu-
tion panel.
The tap or shower head
is scaled up or dirty.
Clean and/or descale the
tap/shower head.
The water supply has
been interrupted.
Vent the appliance and
the cold water inlet line
(see chapter "Settings").
No hot water flowing and
overheating indicator
illuminated.
The appliance has over-
heated; heating output
has been interrupted.
The extracted water vol-
ume is too low.
Open the tap further.
After cooling down, the
appliance switches on
again automatically.
If you cannot remedy the fault, notify your qualified contractor.
To facilitate and speed up your request, provide the number from
the type plate (000000-0000-000000).
DHC. . . no.: 000000-0000-000000

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ENGLISH
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 the original accessories and spare parts intended for the
appliance are used.
!
Material damage
Observe the maximum inlet temperature. The appliance
can be damaged by higher temperatures.
7.2 Instructions, standards and regulations
Note
Observe all applicable national and regional regulations
and instructions.
Hardness range of the water
The hardness range of the water must not be greater than that
indicated in the Specification / Data table.
8. Appliance description
8.1 Standard delivery
Delivered with the appliance:
- Cable grommet
- Connector
- Flat gaskets
- 2 fixing screws 4 x 35 and rawl plugs
- Washer
- Installation template in the centre part of these instructions
- fitted connection pipes (only for DHC 6 U)
- 2 hexagon screws (only for DHC 6 U)
8.2 Accessories
Pressure-tested taps
- WKMD twin lever kitchen tap
- WBMD twin-lever bathroom wall tap
9. Preparations
 Flush the water line thoroughly.
Water installation
- A safety valve is not required.
- Flow rate
 Ensure that the flow rate (see chapter "Specification / Data
table", On) for switching on the appliance is achieved.
 Increase the mains water pressure if the required flow rate is
not achieved with the draw-off valve fully opened.
!
Material damage
A ribbon heater is not permitted.
Permissible water pipe materials
- Cold water inlet pipe:
Galvanised steel pipe, stainless steel pipe, copper pipe or
plastic pipe
- DHW outlet pipe:
Stainless steel pipe or copper pipe
!
Material damage
Plastic pipework is not permitted for the DHW line.
Taps/valves
Use suitable taps (see chapter "Appliance description / Accesso-
ries"). Open taps are not permitted.
9.1 Installation site
!
Material damage
Install the appliance in a room free from the risk of frost.
 Always install the appliance vertically near the draw-off
point.
Oversink installation DHC 3, DHC 4, DHC 6, DHC 8
26�02�02�0241�
1 2
1 Installation on finished walls
2 Installation on unfinished walls

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INSTALLATION
Installation
Undersink installation DHC 6 U
26�02�02�0239
9.2 Factory settings
The appliances are prepared in the delivered condition:
DHC 3, DHC 4, DHC 6, DHC 8
- Power supply from above; installation on unfinished walls
- Water connection, installation on unfinished walls
DHC 6 U
- Power supply from below, installation on finished walls
- Water connection, installation on finished walls
10. Installation
Note
 Mount the appliance on the wall. The wall must pro-
vide sufficient load-bearing capacity.
This chapter describes installations in accordance with the factory
settings.
For further installation options for the DHC 3, DHC 4, DHC6 and
DHC 8 appliances, see chapter "Alternative installation options".
26�02�02�1105�
 Undo the cover fixing screw by two turns.
 Remove the appliance front cover towards the front.
26�02�02�1113�
1
2
DHC 3, DHC 4,
DHC 6, DHC 8
1 Power supply from above
2 Water connection on unfinished walls
 Cut or break out the required entries in the appliance back
panel cleanly. If necessary, use a file.
D0000033915
DHC 6 U
1
1 Power supply from below
4,5 - 5,5
4 x 35
 6,0
 6,0
26�02�02�0245�

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ENGLISH
INSTALLATION
Installation
 Mark out the holes for drilling with the installation template.
 Drill the holes and insert suitable rawl plugs.
Note: The drill holes can be used when replacing a DHC appli-
ance. Use the supplied large washer for the upper hole.
 Tighten the two fixing screws to the correct insertion depth.
DHC 3, DHC 4,
DHC 6, DHC 8 50
115
26�02�02�0252�
 Prepare the power cable.
46 - 50
26�02�02�0242�
DHC 3, DHC 4,
DHC 6, DHC 8
 Insert both connectors. Observe the insertion depth.
D0000033916
DHC 3,
DHC 4,
DHC 6,
DHC 8
 Cut an opening in the cable grommet suitable for the select-
ed power cable.
 Install the cable grommet in the back panel.
 Route the power cable through the appliance back panel.
D0000033917
DHC 3, DHC 4,
DHC 6, DHC 8
DHC 6 U
 Mount the appliance back panel over the screws and slide the
appliance back panel downwards.
 DHC 3, DHC 4, DHC 6, DHC 8: Secure the connection pipes
with the supplied flat gaskets onto the connectors.
 Align the appliance and tighten the fixing screws securely.
Connecting the power supply
Warning Risk of electrocution
Carry out all electrical connection and installation work
in accordance with relevant regulations.
Warning Risk of electrocution
 Ensure that the appliance is earthed.
Connection to the power supply is only permissible in
the form of a permanent connection in conjunction with
the removable cable grommet. The appliance must be
able to be separated from the power supply by an isola-
tor that disconnects all poles with at least 3 mm contact
separation.
!
Material damage
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").
10.1 Alternative installation options only for DHC 3,
DHC 4, DHC6, DHC 8
- Power supply from above on finished walls
- Power supply from below on finished walls
- Water installation for finished walls
 Cut or break out the required entries in the appliance back
panel cleanly (for positions, see chapter "Specification / Di-
mensions and connections"). If necessary, use a file.

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INSTALLATION
Installation
Power supply from above on finished walls
 Cut an opening in the cable grommet suitable for the select-
ed power cable (for positions of the connections, see chapter
"Specification").
 Install the cable grommet in the back panel.
 Route the power cable through the appliance back panel.
Power supply from below on finished walls
26�02�02�1110�
DHC 3, DHC 4,
DHC 6, DHC 8
 Push down the locking hook that secures the mains terminal,
then remove the mains terminal.
 Reposition the mains terminal in the appliance from the top
to the bottom and secure the mains terminal by sliding it
under the locking hook.
Note
The control wires must not impair the differential pres-
sure switch.
 Route the control wires on the side between the
differential pressure switch and the appliance back
panel.
 Cut an opening in the cable grommet suitable for the select-
ed power cable.
 Install the cable grommet in the back panel.
 Route the power cable through the appliance back panel.
Water installation for finished walls
26�02�02�1341
DHC 3, DHC 4,
DHC 6, DHC 8
 Cut or break out the required entries in the appliance back
panel cleanly. If necessary, use a file.
DHC 3, DHC 4,
DHC 6, DHC 8
26�02�02�1108�
 Guide the connectors through the openings in the appliance
back panel and fit them with flat gaskets onto the appliance
connection pipes.
 Fit the tap connection pipes with flat gaskets onto the
connectors.
10.2 Completing the installation
26�02�02�1106�
 Fit the appliance cover.
 Secure the appliance cover with the screw.

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ENGLISH
INSTALLATION
Commissioning
Alternative cap fixing only for DHC 6 U
In the case of a limited clearance between the appliance and the
floor, use the hexagon screws supplied to secure the cap.
26�02�02�0256
3
2
1
DHC 6 U
1 Standard fixing screw
2 Hexagon screws
3 Knock-outs
 Remove the standard screw.
 Insert the hexagon screws.
 Cleanly break or cut out the knock-outs in the appliance cap.
If necessary, use a file.
11. Commissioning
Warning Risk of electrocution
Commissioning may only be carried out by an authorised
contractor in accordance with safety regulations.
11.1 Commissioning
26�02�05�0087
 Open and close all connected draw-off valves several times,
until all air has been vented from the pipework and the
appliance.
 Carry out a tightness check.
 Switch the mains power ON.
 Where required, enter a flow rate, resulting in an outlet tem-
perature of around 35 - 40°C.
 Check the function of the appliance.
Appliance handover
 Explain the appliance function to users and familiarise them
with its operation.
 Make the user aware of potential dangers, especially the risk
of scalding.
 Hand over these instructions.
11.2 Recommissioning
!
Material damage
After an interruption in the water supply, recommission
the appliance by carrying out the following steps in order
to prevent irreparable damage to the heating system.
 Isolate the appliance from the power supply by re-
moving the fuse/tripping the MCB.
 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.
- See chapter "Commissioning"
12. Shutting down
 Isolate all poles of the appliance from the power supply.
 Drain the appliance (see chapter "Maintenance").
13. Troubleshooting
Problem Cause Remedy
The differential pressure
switch does not start the
heating element, even
though the DHW valve is
fully open.
The sieve in the differ-
ential pressure switch is
blocked.
Clean the sieve in the dif-
ferential pressure switch.
The flow rate is too low. Correct the flow rate; see
chapter "Maintenance".
No hot water flowing,
even though the differ-
ential pressure switch
can be heard switching
on.
The high limit safety
cut-out has switched the
appliance off for safety
reasons.
Remedy the cause of
the fault. Isolate the ap-
pliance from the power
supply and depressurise
the water line. Press the
high limit safety cut-out
reset button; see chapter
"Maintenance".
The heating element
is scaled up; the high
limit safety cut-out has
switched off due to heat
build-up.
Replace the heater.
The heater is faulty. Replace the heater.
14. Maintenance
Warning Risk of electrocution
Before any work on the appliance, disconnect all poles
from the power supply.
Draining the appliance
You can drain the appliance for maintenance work or to protect
it from frost.
DANGER Scalding
Hot water may escape when draining the appliance.
 Close the shut-off valve in the cold water supply line.
 Open all draw-off valves.
 Remove the power supply.
 Undo the water connections on the appliance.

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INSTALLATION
Specication
Adjusting the flow rate
If the required temperature is not achieved, you can limit the flow
rate. This will give you a higher temperature.
26�02�02�0255�
 Set the flow rate with the adjusting screw in such a way that
the outlet temperature complies with the details in chapter
"Specification / Data table".
Clean sieve
You can clean the fitted sieve after removing the cold water con-
nection pipe.
1.
2.
90°
26�02�02�0258�
1
2
3
1 Earth screw
2 Strainer
3 Cold water connection pipe
 Undo the earth screw by approx. two turns.
 Loosen the cold water connection pipe by turning the pipe
in the differential pressure switch through 90° and pulling it
down.
 Clean the strainer and replace if required.
 Reinstall the parts in reverse order.
!
Material damage
Always secure the earth screw.
Activating the high limit safety cut-out
Once faults have been remedied, you can reactivate the high limit
safety cut-out.
26�02�02�0261�
 Isolate the appliance from the power supply and depressur-
ise the water line. Push in the high limit safety cut-out reset
button.
Appliance storage
 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.
15. Specification
15.1 Dimensions and connections
DHC 3, DHC 4, DHC 6, DHC 8
360
200
c06 c01
100 104
35
273
59
54
242
c01
c06
9
b02
D0000018085
b02 Entry electrical cables 1
c01 Cold water inlet Male thread G 1/2 A
c06 DHW outlet Male thread G 1/2 A