STIEBEL ELTRON DHM 6 220 User manual

Hydraulically controlled mini instantaneous water heater
» DHM 6 220
OPERATION AND INSTALLATION

2| DHM 6 220 www.stiebel-eltron.com
CONTENTS | SPECIAL INFORMATION
SPECIAL INFORMATION
OPERATION
1. General information �����������������������������������������3
2. Safety����������������������������������������������������������5
3. Appliance description ���������������������������������������6
4. Settings �������������������������������������������������������6
5. Cleaning, care and maintenance ���������������������������6
6. Troubleshooting ����������������������������������������������7
INSTALLATION
7. Safety����������������������������������������������������������7
8. Appliance description ���������������������������������������8
9. Preparations ��������������������������������������������������8
10. Installation����������������������������������������������������9
11. Commissioning ��������������������������������������������� 12
12. Shutting down���������������������������������������������� 13
13. Troubleshooting �������������������������������������������� 13
14. Maintenance ������������������������������������������������ 14
15. Specification ������������������������������������������������ 15
GUARANTEE
ENVIRONMENT AND RECYCLING
SPECIAL INFORMATION
- The appliance may be used by children aged 3
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.
- During operation, the tap can reach temperatures
in excess of 50°C. There is a risk of scalding at
outlet temperatures 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.

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OPERATION
GENERAL INFORMATION
- In the case of damage, the power cable must only
be replaced by a qualified contractor authorised
by the manufacturer using the original spare
part.
- Secure the appliance as described in chapter „In-
stallation/ Installation“.
- Observe the maximum permissible pressure (see
chapter „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
1. General information
The chapter “Operation” is intended for appliance users and qual-
ified 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.

OPERATION
GENERAL INFORMATION
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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
Notes are bordered by horizontal lines above and below
the text. General information is identified by the symbol
shown on the left.
 Read these texts carefully.
Symbol
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
Unless specified otherwise, all dimensions are given in
mm.
!
!

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OPERATION
SAFETY
2. Safety
2.1 Intended use
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.
This appliance is designed to heat DHW. The appliance is designed
for one hand washbasin.
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
DANGER 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.
DANGER Electrocution
Any damaged power cables must be replaced by a qual-
ified electrician. This prevents potential hazards from
arising.
!
WARNING Injury
The appliance may be used by children aged 3 and up and
persons with reduced physical, sensory or mental capa-
bilities 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 resulting risks. Children must never play with the
appliance. Children must never clean the appliance or
perform user maintenance unless they are supervised.
!
Material losses
Protect the appliance and tap against frost.
!
Material losses
Only use the special aerator provided. Prevent scale
build-up at the tap outlets (see chapter "Cleaning, care
and maintenance").
2.3 Test symbols
See type plate on the appliance.

OPERATION
APPLIANCE DESCRIPTION
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3. Appliance description
The hydraulically controlled mini instantaneous water heater
heats the water directly at the draw-off point. The heating system
starts automatically when 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.
Fitting the special aerator supplied provides an optimum water jet.
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 the start volume, see chapter “Specification/ Data table/ On”.
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 of 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/valves regularly. Limescale deposits at the
spouts can be removed using commercially available descal-
ing agents.
 Have the electrical safety of the appliance regularly checked
by an electrician.
 Regularly descale or replace the special aerator (see chapter
“Appliance description/Accessories”).

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INSTALLATION
TROUBLESHOOTING
6. Troubleshooting
Problem Cause Remedy
The appliance will not
start despite the DHW
valve being fully open.
No power to the appli-
ance.
Check the fuses/MCBs in
your fuse box.
The aerator in the tap is
scaled up or dirty.
Clean and/or descale the
aerator or replace the
special aerator.
The water supply has
been interrupted.
Vent the appliance and
the cold water inlet line
(see chapter "Settings").
If you cannot remedy the fault, notify your qualified contractor. To
facilitate and speed up your request, provide the serial number
from the type plate (000000-0000-000000).
DHM 6-220 Nr.: 000000-0000-000000
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 means of a central thermostatic
valve (see chapter "Appliance description/ Accessories").

INSTALLATION
APPLIANCE DESCRIPTION
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7.2 Instructions, standards and regulations
Note
Observe all applicable national and regional regulations
and instructions.
The specific electrical resistance of the water 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 “Speci-
fication/ Data table”). Your water supply utility will advise you of
the specific electrical water resistance or conductivity.
8. Appliance description
8.1 Standard delivery
The following are delivered with the appliance:
- Sieve inside the cold water inlet
- Special aerator “SR”
- Connection hose 3/8, 500mm long, with gaskets*
- Tee 3/8*
- Company logo for oversink installation
*for the connection as pressure-tested appliance
8.2 Accessories
Special aerator “SR”*
- SR 5: Part number 270582
* For use in thread M22/M24.
Pressure-tested tap
- WEH Sensor tap for washbasins
ZTA 3/4 - central thermostatic valve
Thermostatic valve for central premixing, for example for operat-
ing an instantaneous water heater with a solar thermal system.
9. Preparations
 Flush the water line thoroughly.
Water installation
A safety valve is not required.
Taps
 Use suitable taps (see chapter “Appliance description/
Accessories”).

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INSTALLATION
INSTALLATION
Note
Fitting the special aerator supplied provides an optimum
water jet.
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 only suitable for undersink installation (water
connections at the top).
DANGER Electrocution
Protection rating IP25 is only ensured if the appliance
back panel is fitted.
 Always fit the appliance back panel.
10.2 Installation options
Undersink installation, pressure-tested, with pressure-tested
tap
26_02_05_0093

INSTALLATION
INSTALLATION
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10.2.1 Appliance installation
 Mount the appliance on the wall.
Note
The wall must have a 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.


26_02_05_0084
 Using pliers, break out the knock-out for the power cable
in the appliance cover. Correct the contours with a file if
necessary.
 Use the appliance back panel as a drilling template.
 Secure the appliance back panel to the wall with suitable
rawl plugs and screws.



26_02_05_0085

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INSTALLATION
INSTALLATION
 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.
10.2.2 Tap installation
!
Material losses
When making the connections, counter the torque on the
appliance using a size 14 spanner.
 Fit the 3/8 connection hose provided and the 3/8 tee.
 Install the tap. For this, also observe the tap operating and
installation instructions.
10.2.3 Oversink installation, non-pressurised, with non-
pressurised tap
26_02_05_0081_
Tap installation
 Fit the tap according to the illustration. 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; see chapter "Installa-
tion alternatives/ Undersink installation".

INSTALLATION
COMMISSIONING
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10.3 Connecting the power supply
DANGER Electrocution
Carry out all electrical connection and installation work
in accordance with 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
In the delivered condition, these appliances are equipped
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.
!
Material losses
When making the connection to a standard safety socket
(in the case of a power cable with plug), ensure that the
socket is freely accessible after the appliance has been
installed.
!
Material losses
Take note of the type plate. The specified voltage must
match the mains voltage.
 Connect the power cable as shown in the wiring diagram
(see chapter “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.
 Insert the power cable plug, if present, into the standard
safety socket or set the fuse/MCB.
 Check the function of the appliance.
11.2 Appliance handover
 Explain the appliance function to users and familiarise them
with its operation.

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INSTALLATION
SHUTTING DOWN
 Make users aware of potential dangers, especially the risk of
scalding.
 Hand over these instructions.
11.3 Recommissioning
!
Material losses
Following an interruption of the water supply, recommis-
sion the appliance by carrying out the following steps,
in order to prevent irreparable damage to the bare wire
heating system.
 Isolate the appliance from the power supply. Pull the power
cable plug, if present, from the socket, or remove the fuse/
reset the MCB.
 See chapter “Initial start-up”.
12. Shutting down
 Isolate the appliance from the power supply by means of the
fuse/MCB in your fuse box or by pulling the power cable plug
from the socket.
 Drain the appliance (see chapter “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
special aerator.
The sieve in the cold
water line is blocked.
Clean the sieve after
shutting off the cold
water inlet line.
The heater 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.

INSTALLATION
MAINTENANCE
14 | DHM 6 220 www.stiebel-eltron.com
Activating the safety pressure limiter
D0000059721
1
1 1-pole safety pressure limiter
14. Maintenance
DANGER Electrocution
Before any work on the appliance, disconnect all poles
from the power supply.
Draining the appliance
DANGER Scalding
Hot water may escape during the draining process.
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.

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INSTALLATION
SPECIFICATION
Cleaning the strainer
You can clean the fitted strainer after removing the cold water
supply pipe.
26_02_05_0065_
Checking the earth conductor
 Check the earth conductor (in Germany e.g. BGV A3) on the
earth conductor contact of the power cable and on the appli-
ance connector.
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.
Replacing the power cable
 If replacing the cable, use a power cable with 4mm²
cross-section.
15. Specification
15.1 Dimensions and connections
95
28
30
120
143
190
4,8
165
82
20
b02
b03
c06
c01
D0000018336
DHM
b02 Entry 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

INSTALLATION
SPECIFICATION
16 | DHM 6 220 www.stiebel-eltron.com
15.2 Wiring diagram
15.2.1 DHM 6 220, 1/N/PE ~ 220 V
V >
p>
L N
L N
D0000040409
1
2
1 Safety pressure limiter
2 Pressure differential switch
L = brown
N = blue
!
Material losses
 In the case of a permanent power supply, connect
the power cable according to the designations on
the socket terminals.
15.3 Increasing the temperature
234567
10
15
20
25
30
35
40
D0000041401
X Flow rate in l/min
Y Temperature increase in K
15.4 Application areas
For the specific electrical resistance and specific electrical
conductivity, see “Data table”.
Standard specifica-
tion at 15°C 20°C 25°C
Spec.
resist-
ance
ρ ≥
Spec. conductiv-
ity σ≤
Spec.
resist-
ance
ρ ≥
Spec. conductiv-
ity σ≤
Spec.
resist-
ance
ρ ≥
Spec. conductiv-
ity σ≤
Ωcm mS/m μS/cm Ωcm mS/m μS/cm Ωcm mS/m μS/cm
1100 91 909 970 103 1031 895 112 1117

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INSTALLATION
SPECIFICATION
15.5 Data table
DHM 6 220
220815
Electrical details
Rated voltage V220
Rated output kW 6,0
Rated current A27,3
Fuses A32
Frequency 2 Hz 50
Phases 1/N/PE
Specific resistance ρ15 ≥ (at ϑcold ≤25 °C) Ω cm 1100
Specific conductivity σ15 ≤ (at ϑcold ≤25°C) μS/cm 909
Specific resistance ρ15 ≥ (at ϑcold >25°C) Ω cm 1100
Specific conductivity σ15 ≤ (at ϑcold >25°C) μS/cm 909
Max. mains impedance at 220V / 50Hz Ω 0,358
Connections
Water connection G 3/8 A
Values
Max. permissible inlet temperature °C 35
ON l/min > 2,6
Pressure drop at flow rate MPa 0,09
Flow rate for pressure drop l/min 2,6
DHW delivery l/min 3,4
Δϑat DHW delivery K25
Hydraulic data
Rated capacity l 0,1
Versions
Oversink installation X
Undersink installation X
DHM 6 220
Open vented type X
Sealed unvented type X
Protection class 1
Insulation block Plastic
Heating system heat generator Bare wire
Cap and back panel Plastic
Colour white
IP-Rating IP25
Energy data
Energy efficiency class A
Dimensions
Height mm 143
Width mm 190
Depth mm 82
Weights
Weight kg 1,4

INSTALLATION
SPECIFICATION
18 | DHM 6 220 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 aect 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.

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GUARANTEE | ENVIRONMENT AND RECYCLING
GUARANTEE
ENVIRONMENT AND RECYCLING

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Ir r t um u n d te c hni s che Ä nd e ru n ge n v o rb e hal t en! | Sub jec t t o er r or s an d te c hni c al c h ange s! | S ous r és e r ve d ‘e r re u rs
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