Vaillant VED User manual

Operating and installation instructions
EXP
VED

For the operator
Instructions for use
VED
Electric instantaneous water heater

Table of contents
2Operating instructions for VED electric instantaneous water heater 0020149586_00
Table of contents
1 Notes on the documentation ................................3
1.1 Storing documents.....................................................3
1.3 Applicability of the instructions..............................3
1.4 Identification plate .....................................................3
1.5 CE label .........................................................................3
2 Safety............................................................................4
2.1 Classification of action-related warnings .............4
2.2 Intended use ................................................................4
2.3 General safety information ......................................4
3 Functions and operation.........................................5
4 Energy-saving tips ...................................................6
5 Detecting and rectifying faults............................6
6 Care................................................................................6
7 Maintenance, guarantee and
customer service ......................................................6
8 Recycling and disposal............................................6

Operating instructions for VED electric instantaneous water heater 0020149586_00 3
1 Notes on the documentation
The following information is intended to help you
throughout the entire documentation. Further docu-
ments apply in combination with these instructions for
use.
We accept no liability for any damage caused by failure
to observe these instructions.
Other applicable documents
>When operating the VED heater, you must also
observe all operating instructions that are included
with other components of your system.
1.1 Storing documents
>Store the enclosed operating instructions and all
other applicable documents in such a way that they
are available whenever required and for any subse-
quent operators of the system.
1.3 Applicability of the instructions
These instructions apply for the following only:
Type designation Article number
VED H 12/7 0010007731
VED H 18/7 0010007732
VED H 21/7 0010007733
VED H 24/7 0010007734
VED H 27/7 0010007735
Tab. 1.1 Identifying the unit
1.4 Identification plate
The unit's article number is part of the serial number. To
find out the serial and article numbers, refer to the iden-
tification plate. The identification plate can be found to
the right, next to the operator control panel, under the
cover.
Vaillant GmbH Remscheid / Germany
Serial - No.
VED H 18/7
21093500200752100006000000N3
18 kW; 400 V 3~ 50Hz
1MPa (10bar); p 15 >= 900 Ohm cm; IP 25
Observe operating- and installation manual
Appliance must be earthed
Fig. 1.1 Example of an identification plate
Explanation of the symbols on the identification plate
CE mark, see section 1.5
The VDE GS mark confirms that the
unit complies with standards and
has been tested for safety
Symbol confirming conformity with
the electromagnetic compatibility
standard
Ensure proper disposal at the end
of its useful life (not household
waste)
Read the operating and
installation instructions
21093500200752100006000000N3
Serial number as a bar code and in
plain text.
The 7th to 16th digits of the serial
number form the unit's article
number
1.5 CE label
CE labelling shows that, based on the type
overview, the units comply with the basic
requirements of the applicable directives.
Notes on the documentation 1

4Operating instructions for VED electric instantaneous water heater 0020149586_00
2 Safety
2.1 Classification of action-related warnings
The action-related warnings are classified in accordance
with the severity of the possible danger using the follow-
ing warning signs and signal words:
Warning
symbol Signal word Explanation
aDanger! Imminent danger to life
or risk of severe
personal injury
eDanger! Risk of death from
electric shock
aWarning. Risk of minor personal
injury
bCaution. Risk of material or environmen-
tal damage
Tab. 2.1 Meaning of warning symbols and signal words
2.2 Intended use
Vaillant VED electric instantaneous water heaters have
been constructed using state-of-the-art technology in
accordance with the recognised safety rules and regula-
tions. Nevertheless, there is still a risk of death or seri-
ous injury to the user or others or of damage to the unit
and other property in the event of improper use or use
for which the unit is not intended.
This unit is not designed to be used by persons (includ-
ing children) with limited physical, mental or sensory
capabilities or by persons who do not have enough expe-
rience and/or knowledge, unless they are supervised by
a person who is responsible for their safety or have
been instructed by him/her about how to use the unit.
Children must be supervised to ensure that they do not
play with the unit.
The Vaillant VED electric instantaneous water heater
must only be used to heat up drinking water. The Vaillant
VED electric instantaneous water heaters are suitable
for use only in an enclosed, frost-free room in a domes-
tic environment. The Vaillant VED electric instantaneous
water heaters are not suitable for use in secondary
returns.
Any other use that is not specified in these instructions,
or use beyond that specified in this document shall be
considered improper use. Any direct commercial or
industrial use is also deemed to be improper. The manu-
facturer/supplier is not liable for any damage resulting
from such use. In this case, the user alone bears the risk.
Intended use includes the following:
– observance of the accompanying operating, instal-
lation and maintenance instructions for the Vaillant
product and any other parts and components of
the system
– compliance with all inspection and maintenance
conditions listed in the instructions.
Caution.
Improper use of any kind is prohibited.
2.3 General safety information
Assembly and settings
All work involved in the installation, set-up, maintenance
and repair of the VED electric instantaneous water
heater must only be carried out by an approved heating
specialist company, who also assumes the responsibility
for installing the unit properly and commissioning it for
the first time.The VED electric instantaneous water
heater must be installed in strict compliance with these
installation instructions.
Risk of death from electric shock from live lines and
connections!
During all work on the open unit, particularly on electri-
cal lines and connections, there is a risk of death from
electric shock.
>Do not carry out any work on the unit yourself.
>Inform your heating specialist company if your VED is
not working correctly.
Risk of death from electric shock from live lines and
connections!
The drinking water used must demonstrate resistance
greater than or equal to 900 ohm at 15°C. Otherwise,
the unit must not be used.
>Before installing the unit, ask the competent person
at your local water company to inform you about the
water resistance and conductivity.
>Consult a competent person if you have any doubt as
to the requirements for water quality.
Risk of being scalded by hot water!
The outlet temperatures at the draw-off points can be
up to 60°C.
>When using a VED electric instantaneous water
heater, be aware of the risk of scalding from high out-
let temperatures.
>There is a particular risk of scalding whenever your
VED is set to stage II.
>In normal operating mode, set the output selector on
your VED to stage I to avoid scalding.
2 Safety

Operating instructions for VED electric instantaneous water heater 0020149586_00 5
Material damage inside the unit caused by poor
quality water
A VED electric instantaneous water heater must only be
used to heat up drinking water. This potable water must
meet the specific German or Austrian legal requirements
for quality. Otherwise, it is not possible to rule out the
risk of corrosion inside the unit.
>Consult a competent person if you have any doubt as
to the requirements for water quality.
Risk of frost.
If a VED electric instantaneous water heater is placed
out of operation for a relatively long period of time in an
unheated room in cold weather, the water in the unit and
pipes may freeze.
>Consult a competent person if you have any doubt as
to requirements.
>Ensure that your VED electric instantaneous water
heater is installed in a permanently frost-free room.
Material damage to the unit caused by changes
No changes must be made to your VED.
In the event of a fault
>If your VED is not producing hot water or if any other
fault occurs, inform an approved heating specialist
company.
>If the VED ever malfunctions, inform your heating
specialist company.
>Do not carry out any repairs yourself.
>Do not open the unit cover under any circumstances.
3 Functions and operation
If you turn on the hot water at a draw-off point (mixer or
separate tap), your VED will automatically warm up the
drinking water.
aDanger!
Risk of being scalded by hot water.
The water temperature at the draw-off points
can reach 60°C.
>When using a VED electric instantaneous
water heater, be aware of the risk of scald-
ing from high outlet temperatures.
>There is a particular risk of scalding when-
ever your VED is set to stage II.
>In normal operating mode, set the output
selector on your VED to stage I to avoid
scalding
Fig. 3.1 Output selector
>Set the output selector to stage I or stage II.
– If the output selector is set to stage I, your VED is
in partial load operation. If the output selector is
set to stage II, your VED is in full load operation.
– For more information on the possible hot water
temperatures, refer to the "Technical Data" section
of the installation instructions.
Also take note of the following:
– The desired temperature may not be reached when
drawing large volumes in cold weather.
>If this occurs, briefly set the output selector to stage
II or reduce the water volume being drawn. In both
cases, the water temperature will increase very
quickly.
Safety 2
Function and operation 3

6Operating instructions for VED electric instantaneous water heater 0020149586_00
4 Energy-saving tips
You can help to save energy by following the tips and
advice below:
Appropriate hot water temperature
The water should only be heated up to the extent that is
necessary for use. Any further heating will result in
unnecessary energy consumption. For you, this means
that you should:
>Set your VED to stage I in normal operating mode.
>Briefly set the output selector to stage II in special
cases where you need more hot water than stage I is
able to provide. After using the hot water, remember
to set the output selector back to stage I.
5 Detecting and rectifying faults
eDanger!
Risk of death from electric shock.
Live lines and connections may cause a
potentially lethal electric shock.
>Do not attempt to repair the unit yourself
under any circumstances.
>Under no circumstances should the unit
cladding be removed.
>If the unit ever malfunctions, inform an
approved heating specialist company
immediately.
6 Care
There is no need to care for your Vaillant VED electric
instantaneous water heater because all internal parts
are protected against dirt and moisture. You can clean
the exterior of the unit with a damp cloth and a little
soap.
iDo not use any abrasive scouring or cleaning
agents when cleaning the unit cladding.
7 Maintenance, guarantee and
customer service
The permanent operational readiness, safety, reliability
and long service life of your electronic VED electric
instantaneous water heater require annual inspections
and maintenance work to be carried out by a competent
person.
aDanger!
Risk of injury and material damage due
to incorrect maintenance and repairs.
If you fail to carry out maintenance, or if
you carry this out incorrectly, this may
adversely affect the operating reliability of
the unit.
>Never attempt to perform maintenance
or repairs on your VED electric instanta-
neous water heater by yourself.
>You must employ an approved heating spe-
cialist company to complete such work. We
recommend making a maintenance agree-
ment.
bCaution.
Possible material damage to the unit.
A lack of maintenance can affect the func-
tional safety of the VED. E.g. unit defects
caused by limescale formation. In areas of
hard water (more than 14 °dH = 2.5
CaCO3mmol/l) or very hard water (more than
20 °dH = 3.6 CaCO3mmol/l), a significantly
more frequent maintenance interval may be
required.
>Have your VED inspected at least every
3 years by a competent person.
>If you live in an area with very hard water,
Vaillant recommends that you have the
maintenance service carried out once a
year by a competent person.
8 Recycling and disposal
If your Vaillant unit is labelled with this symbol, it
does not belong with your household waste at the
end of its useful life.
>Instead, take the unit to a collection point for recycling
electrical and electronic devices.
For more information on where to take your used electrical
or electronic devices, contact your town or district authori-
ties, waste disposal company, or the competent person who
installed the unit.
4 Energy-saving tips, 5 Detecting and rectifying faults, 6 Care
7 Maintenance, guarantee and customer service 8 Recycling and disposal

VED
Electric instantaneous water heater
For the competent person
Installation instructions

Table of contents
2Installation instructions for VED electric instantaneous water heater 0020149586_00
Table of contents
1 Notes on the documentation ................................3
1.1 Observing other applicable documents............3
1.2 Storing documents.....................................................3
1.4 Applicability of the instructions..............................3
1.5 CE label .........................................................................3
2 Safety............................................................................4
2.1 Safety and warning information .............................4
2.2 Intended use ................................................................4
2.3 General safety information ......................................4
3 Equipment and functional description...............6
3.1 Overview .......................................................................6
3.2 Function.........................................................................6
4 Installation..................................................................6
4.1 Scope of delivery........................................................6
4.2 Installation site............................................................ 7
4.3 Required minimum clearances ................................ 7
4.4 Mounting the unit to the wall ..................................8
4.5 Connecting the hot and cold water...................... 10
4.6 Connecting the unit to the electricity supply.....12
5 Starting up/decommissioning..............................13
5.1 Purging the unit.........................................................13
5.2 Fitting the unit cladding...........................................13
5.3 Checking the system's functionality .....................14
5.4 Decommissioning.......................................................14
6 Handing over to the operator ..............................14
7 Replacement parts and accessories .................14
8 Detecting and rectifying faults...........................15
9 Inspection and maintenance................................16
10 Technical data ...........................................................17

3Installation instructions for VED electric instantaneous water heater 0020149586_00
1 Notes on the documentation
The following information is intended to help you
throughout the entire documentation. Other documents
apply in addition to these installation instructions.
We accept no liability for any damage caused by failure
to observe these instructions.
1.1 Observing other applicable documents
>When installing the VED unit, you must observe all
the installation instructions for the assemblies and
components of the system.
These installation instructions are enclosed with the
various system parts and supplementary components.
>Furthermore, observe all operating instructions
enclosed with components of the system.
1.2 Storing documents
>Pass these installation instructions and all other appli-
cable documents and, if necessary, any required tools
to the system operator.
The system operator should retain these instructions
and tools so that they are available when required.
1.4 Applicability of the instructions
These instructions apply for the following only:
Type designation Article number
VED H 12/7 0010007731
VED H 18/7 0010007732
VED H 21/7 0010007733
VED H 24/7 0010007734
VED H 27/7 0010007735
Tab. 1.1 Identifying the unit
The unit's article number is part of the serial number. To
find out the serial and article numbers refer to the iden-
tification plate. The identification plate can be found to
the right, next to the operator control panel, under the
cover.
1.5 CE label
CE labelling shows that, based on the type
overview, the units comply with the basic
requirements of the following directives:
– Electromagnetic compatibility directive (Council Direc-
tive 2004/108/EC)
– Low voltage directive (Council Directive 2006/95/EC)
Notes on the documentation 1

4Installation instructions for VED electric instantaneous water heater 0020149586_00
2 Safety
2.1 Safety and warning information
When installing the VED electric instantaneous water
heater, you must observe the general safety instructions
and warning notes that appear before all of the actions.
2.1.1 Classification of action-related warnings
The action-related warnings are classified in accordance
with the severity of the possible danger using the follow-
ing warning signs and signal words:
Warning
symbol Signal word Explanation
aDanger! Imminent danger to life
or risk of severe
personal injury
eDanger! Risk of death from
electric shock
aWarning. Risk of minor personal
injury
bCaution. Risk of material or environmen-
tal damage
Tab. 2.1 Meaning of warning symbols and signal words
2.2 Intended use
Vaillant VED electric instantaneous water heaters have
been constructed using state-of-the-art technology in
accordance with the recognised safety rules and regula-
tions. Nevertheless, there is still a risk of death or seri-
ous injury to the user or others or of damage to the unit
and other property in the event of improper use or use
for which the unit is not intended.
This unit is not designed to be used by persons (includ-
ing children) with limited physical, mental or sensory
capabilities or by persons who do not have enough expe-
rience and/or knowledge, unless they are supervised by
a person who is responsible for their safety or have
been instructed by him/her about how to use the unit.
Children must be supervised to ensure that they do not
play with the unit.
The Vaillant VED electric instantaneous water heater
must only be used to heat up drinking water. The Vaillant
VED electric instantaneous water heaters are suitable
for use only in an enclosed, frost-free room in a domes-
tic environment. The Vaillant VED electric instantaneous
water heaters are not suitable for use in secondary
returns.
Any other use that is not specified in these instructions,
or use beyond that specified in this document shall be
considered improper use. Any direct commercial or
industrial use is also deemed to be improper. The manu-
facturer/supplier is not liable for any damage resulting
from such use. In this case, the user alone bears the risk.
Intended use includes the following:
– observance of the accompanying operating, instal-
lation and maintenance instructions for the Vaillant
product and any other parts and components of
the system
– compliance with all inspection and maintenance
conditions listed in the instructions.
aCaution.
Improper use of any kind is prohibited.
2.3 General safety information
Assembly and settings
All work involved in the installation, set-up, maintenance
and repair of the VED electric instantaneous water
heater must only be carried out by an approved heating
specialist company, who also assumes the responsibility
for installing the unit properly and commissioning it for
the first time. The VED electric instantaneous water
heater must be installed in strict compliance with these
installation instructions.
2 Safety

5Installation instructions for VED electric instantaneous water heater 0020149586_00
Risk of death from electric shock from live lines and
connections!
During all work on the open unit, particularly on electri-
cal lines and connections, there is a risk of death from
electric shock.
>When working on the open unit, interrupt the power
supply. The unit must be de-energised.
>Check that the unit is de-energised.
>Ensure that the power cannot be restored inadvert-
ently to the unit while you are working on it.
Risk of death from electric shock from live lines and
connections!
The drinking water used must demonstrate resistance
greater than or equal to 900 ohm at 15°C. Otherwise,
the unit must not be used.
>Before installing the unit, ask your water company to
inform you about the water resistance and conductivity.
Risk of being scalded by hot water!
The outlet temperatures at the draw-off points can be
up to 60°C.
>Inform the operator that there is a risk of scalding
due to high outlet temperatures, especially when the
VED is set to stage II.
>Recommend to the operator that, in normal operating
mode, the output selector is set to level I to avoid
scalding.
Material damage inside the unit caused by poor
quality water
A VED electric instantaneous water heater must only be
used to heat up drinking water. This potable water must
meet the specific German or Austrian legal requirements
for quality. Otherwise, it is not possible to rule out the
risk of corrosion inside the unit.
Material damage due to improper use and/or
unsuitable tools
Improper use and/or the use of unsuitable tools may
result in material damage (e.g. water leaks).
>Always use a suitable open-end spanner to tighten or
undo threaded connections.
>Do not use pipe wrenches, extensions, etc.
Risk of frost.
If a VED electric instantaneous water heater is placed
out of operation for a relatively long period of time in an
unheated room in cold weather, the water in the unit and
pipes may freeze.
>Install the VED electric instantaneous water heater in
a permanently frost-free room.
>Store the VED electric instantaneous water heater in
a permanently frost-free area.
Material damage to the appliance caused by changes
No changes must be made to the VED.
>Do not make any changes to the unit yourself.
>Inform the operator that they must not make any
changes to the unit or to the electricity lines or water
pipes.
In the event of a fault
>Read the "Detecting and rectifying faults" section to
find out what you must do in the case of fault.
>Inform the operator that they must not attempt to
repair the unit under any circumstances.
>Inform the operator that they must not remove the
unit cladding.
Safety 2

6Installation instructions for VED electric instantaneous water heater 0020149586_00
3 Equipment and functional
description
3.1 Overview
4
3
1
5
6
7
8
9
10
2
11
12
Fig. 3.1 Overview of the VED
Number Component
1 Mains connection terminal
2 Safety switch
3 Upper anti-spray-water sleeve
4 Adjustment spindle
5 Flow Switch
6 Flow switch
7 Partial load switch
8 Space for optional mains connection terminal
9 Cold water connection
10 Lower anti-spray-water sleeve
11 Hot water connection
12 Heating block
Tab. 3.1 VED components
3.2 Function
Using bare wire heating in the unit's heating block,
drinking water is heated and can then be guided to one
or more draw-off points. The amount and heat of the hot
water is dependent on the VED performance category
and settings. The performance of each VED unit is listed
in the Technical Data table in section 11.
4 Installation
aRisk of death!
Risk of death due to improper installation!
All work involved in the installation, set-up,
maintenance and repair of the VED electric
instantaneous water heater must only be car-
ried out by a recognised competent person,
who also assumes the responsibility for
installing the unit properly and commissioning
it for the first time. The VED electric instanta-
neous water heater must be installed in strict
compliance with these installation instruc-
tions.
iFlush the cold water pipes thoroughly before
installation.
4.1 Scope of delivery
>Check that the scope of delivery is complete
(see tab. 4.1).
62
1
7
3
4
5
390 322
Hot water connection Cold water connection
Bottom
electrical connection
As required:
Additional fixing point for back wall
Installation template
for VED
100
Top electrical connection
170
Mounting plate
Fixing points
Fig. 4.1 Scope of delivery
3 Equipment and functional description
4 Installation

7Installation instructions for VED electric instantaneous water heater 0020149586_00
No. Quantity Name
1 1 VED electric instantaneous water heater
2 1 Operating and installation instructions
31
Box containing fixings (2 bolts, 2 rawl plugs,
1 seal, 1 special fixing screw)
41
Cold water connection piece R 1/2 with a cold
water stop valve
51
Hot water connection piece R 1/2 supplied in the
box
6 1 Installation plate
7 1 Installation template
Tab. 4.1 Scope of delivery
The VED electric instantaneous water heater is com-
pletely pre-assembled. Once the unit has been fitted to
the wall, only the water and electrical installation needs
to be completed.
4.2 Installation site
bCaution.
Risk of frost damage to the unit.
If a VED electric instantaneous water heater
is placed out of operation for a relatively long
period of time in an unheated room in cold
weather, the water in the unit and pipes may
freeze. This results in damage to the unit.
>Install the unit in a permanently frost-free
room.
iThe VED electric instantaneous water heater
meets the current safety regulations for pro-
tected zone 1 and can therefore also be
installed above the bath or in a shower area.
>Wherever possible, install the unit near the draw-off
point that will be most used.
4.3 Required minimum clearances
D
C
E
A
C
B
B
Fig. 4.2 Installation clearances
Key
A At least 50 mm
B At least 50 mm
C At least 120 mm
D At least 130 mm
E Maximum 22 mm
The bottom section of the unit (D) must be level with the
unit's bearing area on the wall; to a height of at least
130 mm. Any possible wall offset (e.g. due to tiles) must
not exceed 22 mm (E). The distance to the floor must be
at least 120 mm (C). The distance above, to the left and
to the right of the unit must be at least 50 mm.
Installation 4

8Installation instructions for VED electric instantaneous water heater 0020149586_00
4.4 Mounting the unit to the wall
4.4.1 Unit and connection dimensions
240
100
7050 277
481
322
5
16
19
100
R 1/2
35 35
1
2
3
5
6
4
Fig. 4.3 Unit dimensions
Key
1 Upper anti-spray-water sleeve
2 Central attachment
3 Output selector
4 Hot water connection R 1/2
5 Cold water connection R 1/2
6 Lower anti-spray-water sleeve
R Outside thread R 1/2
390
322
8585
1
1
2
3
Fig. 4.4 Connection dimensions
Key
1 Installation plate
2 Cold water connection
3 Hot water connection
4.4.2 Removing the unit cladding
1
3
4
2
Fig. 4.5 Removing the unit cladding
>Grip the two straps (1) on the panel (2).
>Splay the two straps (pull them away from the unit).
>Remove the panel (2).
>Undo both bolts (3).
>Remove the cover (4) from the unit.
4 Installation

9Installation instructions for VED electric instantaneous water heater 0020149586_00
4.4.3 Installing the unit
iThe VED electric instantaneous water heater
must be hung on the wall vertically.
>Ensure that the wall and all fixing elements are able
to bear the load. A VED weighs approx. 4.4 kilos when
filled with water.
>Using figures 4.2 to 4.4, double check that the desired
installation location meets the requirements.
390
322
8585
2
1
1
2
Fig. 4.6 Fitting the installation plate
>Hold the installation template against the wall and
mark the fixing points.
>Fix the installation plate (1) to the fixing points (2)
using the rawl plugs and screws.
iWhen replacing a unit, you can use the previ-
ous drill holes as long as they are compatible
with the additional holes on the installation
plate.
eDanger!
Risk of death from electric shock due to
water penetration if the anti-spray-water
sleeve is completely cut away.
The anti-spray-water sleeve should prevent
water penetrating the unit along the length of
the mains connection cable. If the anti-spray-
water sleeve is completely cut away, water
can very easily penetrate and damage the
unit and, in the worst case scenario, can
cause a potentially lethal electric shock.
>Never cut off the anti-spray-water sleeve
completely.
>Cut the end of the anti-spray-water sleeve
in such a way that the sleeve tightly sur-
rounds the mains connection cable.
Fig. 4.7 Cutting the anti-spray-water sleeve for the cable
routing
>Depending on the location of the mains connection
cable in relation to the wall, fit the anti-spray-water
sleeve at the top or the bottom (see fig. 4.7).
iFit the anti-spray-water sleeve in such a way
that the sleeve tightly surrounds the mains
connection cable. Water must not penetrate
the unit's interior.
>Feed the cable through the anti-spray-water sleeve
into the unit's interior.
Installation 4

10 Installation instructions for VED electric instantaneous water heater 0020149586_00
4
1
2
3
Fig. 4.8 Fitting and adjusting the unit
>Fit the unit (2) to the retaining screw (1) on the instal-
lation plate.
>Adjust the unit using the adjustment spindle (4).
>Fix the unit using the fixing screw (3).
>Align the unit (vertically and observing the clearances
detailed in fig. 4.2 to 4.4).
4.5 Connecting the hot and cold water
>Observe the following conditions in order to correctly
fit the water connections:
– All cold and hot water pipes can be made of steel,
copper or plastic. It is important to check with the
manufacturer that pipes made of plastic can be
used with temperatures of 65°C in normal operat-
ing mode. In addition, plastic pipes must be suitable
for a significantly higher load in the short term.
– An expansion relief valve on the cold water pipe is
not required.
– To simplify fitting the water connection, the bottom
section of the unit can be folded up (see (1) in
fig. 4.10). After fitting the connection, you must
fold the bottom section of the unit back down until
it is engaged again. The folding frame must not
be removed.
– When connecting the VED to a plastic pipe system,
a Vaillant pressure monitor (order no. 300768)
must be used.
1
Fig. 4.10 Unit's folding frame
4 Installation

11Installation instructions for VED electric instantaneous water heater 0020149586_00
bCaution.
Risk of damage to the unit resulting from
improper use and/or unsuitable tools.
Improper use and/or the use of unsuitable
tools may result in material damage (e.g.
water leaks).
>Always use a suitable open-end spanner to
tighten or undo threaded connections.
>Do not use pipe wrenches, extensions, etc.
bCaution.
Possible damage caused by leaking water
connections.
Leaks may occur due to strains in the line
material.
>Take care not to strain the lines as you
tighten the water connections.
bCaution.
Possible damage caused by unsuitable
plastic pipes.
Damage may be caused by unsuitable plastic
pipes.
>Note that when plastic pipes are used, a
pressure monitor (article no. 300768) must
be fitted. The pressure monitor is not
included in the scope of delivery.
>When using plastic pipes, ensure that they
withstand a maximum temperature of
95°C and maximum pressure of 1 MPa
(10 bar) for at least one hour (check manu-
facturer's specifications).
>When using plastic pipes, ensure that they
conform with DIN 16893 and DIN 16892
(check manufacturer's specifications).
1
2
3
4
5
6
7
Fig. 4.9 Water connections
>Put hemp on the two double nipples (2and 6) and
use the connections to screw the double nipples to
the wall (1and 7).
>Insert the seals (3) in the cap nuts of the cold (4) and
hot water connections (5).
>Screw the cold water connection piece (4) to the cold
water connection double nipple (2) in the wall (1).
>Screw the hot water connection piece (5) to the hot
water connection double nipple (6) in the wall (7).
>Insert a seal in the cap nut of the unit-side hot water
connection.
bCaution.
Risk of damage due to pipes being blocked
by foreign bodies in the water.
A water filter that stops foreign bodies enter-
ing the unit must be fitted to the cold water
flow. The unit must not be used without a
water filter. A water filter has been fitted
inside the cold water pipe at the factory.
>During installation, check that the water fil-
ter is present.
>Check that the cold water filter fitted at the factory is
in the correct position in the unit-side cold water con-
nection. The cold water filter is an additional seal on
the cold water side.
Installation 4

12 Installation instructions for VED electric instantaneous water heater 0020149586_00
4.6 Connecting the unit to the electricity supply
eDanger!
Risk of death from electric shock from live
lines and connections!
>Isolate all supplies from the power supply
before carrying out electrical work.
>Check that there is no voltage in the supply
lines and connections.
>Ensure that the power cannot be restored
inadvertently to any of the supply lines and
connections while you are working on the
unit.
>When connecting the electricity supply, also observe
the local regulations from the electricity supply com-
pany as well as the specifications on the identification
plate.
>Also note the following conditions:
– The unit must be installed using a permanent
connection.
– The permanent connection must be equipped with
a customer-supplied partition that has a contact
separation of at least 3 mm on all lines. A line
protection switch, for example, is suitable for this
purpose.
– The unit must be connected to the protective
earth.
– The unit is delivered pre-assembled. When connect-
ing the electricity supply, only the electricity line
needs to be fed in to the unit and connected. This
happens using one of the two anti-spray-water
sleeves that prevent water penetrating the unit;
see fig. 4.7, Cutting the anti-spray-water sleeve for
the cable routing. The connection is fixed to the
upper section of the unit at the factory. If required,
it can be connected to the lower section of the unit
but the electricity line must be fed through the
lower anti-spray-water sleeve.
4.6.1 Electrical connection from above
The electricity line is fed through the upper anti-spray-
water sleeve (2). Figure 4.7 explains how the anti-spray-
water sleeve must be prepared.
>Connect the individual conductors to L1, L2 and L3,
and the protective earth to the mains connection
terminal (1in fig. 4.10).
3
1
2
3a
4
5
6
Fig. 4.10 Electrical connection from above or below
4.6.2 Electrical connection from below
The electricity line is fed through the lower anti-spray-
water sleeve (5). Figure 4.7 explains how the anti-spray-
water sleeve must be prepared.
>Unscrew the mains connection terminal (1) (see
fig. 4.10).
>Move the mains connection terminal (6), including the
internal cable, to the lower position (4) in the unit.
>Screw the mains connection terminal to the lower
position (4).
>Pay particular attention to the internal protective
earth (3) that is screwed to position 3a.
>Check again that the mains connection terminal
cables are correctly positioned.
>Connect the individual conductors to L1, L2 and L3,
and the protective earth to the mains connection ter-
minal (1in fig. 4.10).
4.6.3 Optional load-shedding relay
If required, a load-shedding relay that conforms with
current standards can be connected to the VED. This
relay will turn other power consumers off while hot
water is being drawn off so that there is no overloading.
The load-shedding relay must fulfil the following criteria:
– Input current < 15 A
– Continuous current > 50 A
>Install the optional load-shedding relay to the outer
conductor that is connected to the L2 mains connec-
tion terminal of the VED.
4 Installation