Vaillant ecoTEC plus VU 6/6-5 OVZ Series User manual

For the operator
Operating instructions
ecoTEC plus
VU ..6/6-5 OVZ (H-GB)
GB, IE
Operating instructions
Publisher/manufacturer
Vaillant GmbH
Berghauser Str. 40 D-42859 Remscheid
Tel. [phone]‑0 Fax [phone]‑2810
[email protected] www.vaillant.de

Contents
2Operating instructions ecoTEC plus 0020239012_02
Contents
1 Safety ............................................ 3
1.1 Action-related warnings ................. 3
1.2 Intended use .................................. 3
1.3 General safety information............. 4
2 Notes on the documentation ...... 7
2.1 Observing other applicable
documents ..................................... 7
2.2 Storing documents......................... 7
2.3 Applicability of the instructions....... 7
3 Product description..................... 7
3.1 Serial number ................................ 7
3.2 Information on the identification
plate ............................................... 7
3.3 CE label ......................................... 8
3.4 Benchmark..................................... 8
3.5 Design of the product..................... 8
3.6 Operator control panel ................... 9
3.7 Operating concept ......................... 9
3.8 Basic display................................ 10
3.9 Operating levels........................... 10
3.10 Menu display................................ 10
4 Operation.................................... 10
4.1 Opening the isolator devices ....... 10
4.2 Opening and closing the front
flap ............................................... 11
4.3 Switching on the product ............. 11
4.4 Setting the language.................... 11
4.5 Setting the hot water
temperature ................................. 11
4.6 Setting the heating flow
temperature ................................. 11
4.7 Switching off heating mode
(Summer mode)........................... 12
4.8 Protecting the heating
installation against frost ............... 12
5 Detecting and rectifying
faults ........................................... 12
6 Calling up (Live Monitor)
status codes............................... 12
7 Care and maintenance .............. 13
7.1 Maintenance ................................ 13
7.2 Caring for the product .................. 13
7.3 Checking the condensate drain
pipework and tundish................... 13
7.4 Reading maintenance
messages .................................... 13
8 Decommissioning...................... 13
8.1 Temporarily decommissioning
the product................................... 13
8.2 Permanently decommissioning
the product................................... 13
9 Recycling and disposal............. 13
10 Guarantee and customer
service ........................................ 14
10.1 Guarantee.................................... 14
10.2 Customer service......................... 14
Appendix ............................................... 15
A Operator level –overview ......... 15
B Troubleshooting ........................ 15

Safety 1
0020239012_02 ecoTEC plus Operating instructions 3
1 Safety
1.1 Action-related warnings
Classification of action-re-
lated warnings
The action-related warnings
are classified in accordance
with the severity of the pos-
sible danger using the following
warning signs and signal words:
Warning symbols and signal
words
Danger!
Imminent danger to life
or risk of severe personal
injury
Danger!
Risk of death from electric
shock
Warning.
Risk of minor personal
injury
Caution.
Risk of material or envir-
onmental damage
1.2 Intended use
There is a risk of injury or death
to the user or others, or of dam-
age to the product and other
property in the event of im-
proper use or use for which it
is not intended.
The product is intended as a
heat generator for closed cent-
ral heating installations and for
hot water generation.
Intended use includes the fol-
lowing:
–observance of the operating
instructions included for the
product and any other system
components
–compliance with all inspection
and maintenance conditions
listed in the instructions.
This product can be used by
children aged from 8 years
and above and persons with
reduced physical, sensory or
mental capabilities or lack of
experience and knowledge if
they have been given supervi-
sion or instruction concerning
use of the product in a safe way
and understand the hazards in-
volved. Children must not play
with the product. Cleaning and
user maintenance work must
not be carried out by children
unless they are supervised.
Any other use that is not spe-
cified in these instructions, or
use beyond that specified in this
document shall be considered
improper use. Any direct com-
mercial or industrial use is also
deemed to be improper.
Caution.
Improper use of any kind is
prohibited.

1 Safety
4Operating instructions ecoTEC plus 0020239012_02
1.3 General safety
information
1.3.1 Installation by skilled
tradesmen only
The installation, inspection,
maintenance and repair of the
product, as well as the gas ratio
settings, must only be carried
out by a competent person.
1.3.2 Danger caused by
improper operation
Improper operation may present
a danger to you and others, and
cause material damage.
▶Carefully read the enclosed
instructions and all other ap-
plicable documents, particu-
larly the "Safety" section and
the warnings.
▶Only carry out the activities
for which instructions are
provided in these operating
instructions.
1.3.3 Risk of death from
escaping gas
What to do if you smell gas in
the building:
▶Avoid rooms that smell of
gas.
▶If possible, open doors and
windows fully and ensure
adequate ventilation.
▶Do not use naked flames (e.g.
lighters, matches).
▶Do not smoke.
▶Do not use any electrical
switches, mains plugs, door-
bells, telephones or other
communication systems in
the building.
▶If it is safe to do so, close the
emergency control valve or
the main isolator.
▶If possible, close the gas isol-
ator cock on the product.
▶Warn other occupants in the
building by yelling or banging
on doors or walls.
▶Leave the building immedi-
ately and ensure that others
do not enter the building.
▶Notify the gas supply com-
pany or the Emergency
Service Provider
[phone] by tele-
phone once you are outside
of the building.
1.3.4 Risk of death due to a
blocked or leaking flue
gas pipe
What to do if you smell flue gas
in the property:
▶Open all accessible doors
and windows fully to provide
ventilation.
▶Switch off the product.
▶Inform a competent person.

Safety 1
0020239012_02 ecoTEC plus Operating instructions 5
1.3.5 Risk of death due to
explosive and flammable
materials
▶Do not use or store explosive
or flammable materials (e.g.
petrol, paper, paint) in the in-
stallation room of the product.
1.3.6 Risk of death due to lack
of safety devices
A lack of safety devices (e.g.
expansion relief valve, expan-
sion vessel) can lead to poten-
tially fatal scalding and other
injuries, e.g. due to explosions.
▶Ask a competent person
to explain how the safety
devices work and where they
are located.
1.3.7 Risk of death due
to changes to the
product or the product
environment
▶Never remove, bridge or
block the safety devices.
▶Do not tamper with any of the
safety devices.
▶Do not damage or remove
any seals on components.
▶Do not make any changes:
–The product itself
–to the gas, air, water and
electricity supplies
–to the entire flue gas install-
ation
–to the entire condensate
drain system
–to the expansion relief valve
–to the drain pipework
–to constructional condi-
tions that may affect the
operational reliability of the
product
1.3.8 Risk of corrosion
damage due to
unsuitable combustion
and room air
Sprays, solvents, chlorinated
cleaning agents, paint, adhes-
ives, ammonia compounds,
dust or similar substances may
lead to corrosion on the product
and in the air/flue pipe.
▶Ensure that the supply of
combustion air is always free
of fluorine, chlorine, sulphur,
dust, etc.
▶Ensure that no chemical sub-
stances are stored at the in-
stallation site.
1.3.9 Cabinet-type casing
Enclosing the product in cab-
inet-type casing requires
compliance with the applicable
design instructions.
▶Do not fit the casing on the
product yourself.
▶If you require cabinet-type
casing for the product, consult

1 Safety
6Operating instructions ecoTEC plus 0020239012_02
an approved heating special-
ist company.
1.3.10 Risk of material
damage caused by
frost
▶Ensure that the heating in-
stallation always remains in
operation during freezing con-
ditions and that all rooms are
sufficiently heated.
▶If you cannot ensure the op-
eration, have a competent
person drain the heating in-
stallation.
1.3.11 Risk of injury and
material damage due
to maintenance and
repairs carried out
incorrectly or not
carried out at all
▶Never attempt to carry out
maintenance work or repairs
on your product yourself.
▶Faults and damage should
be immediately rectified by a
competent person.
▶Adhere to the maintenance
intervals specified.

Notes on the documentation 2
0020239012_02 ecoTEC plus Operating instructions 7
2 Notes on the
documentation
2.1 Observing other applicable
documents
▶You must observe all operating instruc-
tions enclosed with the system compon-
ents.
2.2 Storing documents
▶Keep this manual and all other applic-
able documents safe for future use.
2.3 Applicability of the
instructions
These instructions apply only to:
Product article number
Article
number
Gas Coun-
cil Number
VU 126/6-5 OVZ
(H-GB) 0010021220 41-694-13
VU 156/6-5 OVZ
(H-GB) 0010021221 41-694-14
VU 186/6-5 OVZ
(H-GB) 0010021222 41-694-15
VU 246/6-5 OVZ
(H-GB) 0010021223 41-694-16
VU 306/6-5 OVZ
(H-GB) 0010021224 41-694-17
VU 356/6-5 OVZ
(H-GB) 0020015674 41-044-76
3 Product description
3.1 Serial number
The serial number is located on a plate be-
hind the front flap. The plate is in a plastic
fish plate. You can also display the serial
number in the display.
3.2 Information on the
identification plate
The identification plate is mounted on the
underside of the product in the factory.
The identification plate keeps record of
the country in which the product is to be
installed.
Information
on the identi-
fication plate
Meaning
Barcode with serial number
Serial number For quality control purposes;
3rd and 4th digits = year of
production
For quality control purposes;
5th and 6th digits = week of
production
For identification purposes;
7th to 16th digits = product
article number
For quality control purposes;
17th to 20th digits = place of
manufacture
ecoTEC plus Product designation
2H, G20
–2 kPa
(20 mbar)
Factory setting for type of
gas and gas connection
pressure
Cat. Gas-fired boiler category
Condensing
technology
Efficiency class of the boiler
in accordance with EC Dir-
ective 92/42/EEC
Type: Xx3(x) Permissible flue gas connec-
tions
PMS Maximum water pressure in
heating mode
PMW Maximum water pressure in
hot water handling mode
V/Hz Electrical connection
W Max. electrical power con-
sumption
IP Level of protection
Heating mode
Pn Nominal heat output range
in heating mode

3 Product description
8Operating instructions ecoTEC plus 0020239012_02
Information
on the identi-
fication plate
Meaning
Pnc Nominal heat output range
in heating mode (condensing
technology)
P Nominal heat output range
in hot water handling mode
Qn Nominal heating load range
in heating mode
Qnw Nominal heating load range
in hot water handling mode
Tmax. Max. flow temperature
NOx NOx class for the product
Code (DSN) Specific product code
Read the instructions.
GC no. Gas council number
3.3 CE label
The CE label shows that the products
comply with the basic requirements of the
applicable directives as stated on the iden-
tification plate.
The declaration of conformity can be
viewed at the manufacturer's site.
3.4 Benchmark
Vaillant is a licensed member of the
Benchmark Scheme.
Benchmark places responsibilities on both
manufacturers and installers. The purpose
is to ensure that customers are provided
with the correct equipment for their needs,
that it is installed, commissioned and
serviced in accordance with the
manufacturer’s instructions by a
competent person approved at the time by
the Health and Safety Executive and that
it meets the requirements of the
appropriate Building Regulations.
3.5 Design of the product
1
2
3
1 Control elements 2 Plate with serial
number on the
rear
3 Front flap
The Benchmark Checklist can be used to
demonstrate compliance with Building
Regulations and should be provided to
the customer for future reference.
Installers are required to carry out
installation, commissioning and servicing
work in accordance with the Benchmark
Code of Practice which is available from
the Heating and Hotwater Industry
Council who manage and promote the
Scheme.
Benchmark is managed and promoted by
the Heating and Hotwater Industry
Council.
For more information visit
www.centralheating.co.uk

Product description 3
0020239012_02 ecoTEC plus Operating instructions 9
3.6 Operator control panel
50
1
9
8
7
6
2
3
4
1
5
1 Current heating
flow temperat-
ure, operating
mode, fault code
or additional in-
formation
2 Current assign-
ment of the right-
hand selection
button
3 Left- and right-
hand selection
buttons
4and but-
ton
5 Fault clearance
key
6 Maximum out-
put (only used
for Austria,
Germany and
Switzerland)
7 Access to the
menu for addi-
tional information
8 Current assign-
ment of the left-
hand selection
button
9 Active operating
status
3.6.1 Displayed symbols
Sym-
bol
Meaning Explanation
Burner operating
correctly
Burner on
Current burner
modulation rate
Sym-
bol
Meaning Explanation
Heating mode
active
–Permanently
on: Heating
mode heat
requirement
–Flashing:
Burner on in
heating mode
Maintenance re-
quired
Information on
the maintenance
message in the
"Live Monitor"
Summer mode
active
Heating mode is
switched off
Burner anti-cyc-
ling time is active
To avoid the
need for frequent
switching on and
off (increases the
product's working
life).
F. X X
Fault in the
product
Fault in the
product. Appears
instead of the
basic display.
3.7 Operating concept
Op-
erator
control
element
Meaning
–Cancelling the activation of an
operating mode
–Cancelling a change to a set
value
–Move up to next selection level
–Setting the heating flow tem-
perature
–Reading the system pressure
–Activating the comfort mode
–Activating the operating mode
–Confirm setting
–Move down to next selection
level

4 Operation
10 Operating instructions ecoTEC plus 0020239012_02
Op-
erator
control
element
Meaning
+
at the
same
time
Displaying the current product
status
or –Reducing or increasing the set
value
The selection buttons have a soft key func-
tion, i.e. their function can change.
If, for example, you press the left-hand
selection button in the basic display,
the current function switches from (hot
water temperature) to Back.
Adjustable values flash in the display.
You must always confirm a change to a
value. Only then is the new setting saved.
The display lights up when you switch the
product on or press a button.
If you do not press any button within one
minute, the display lighting goes out.
3.8 Basic display
50
The basic display shows the current condi-
tion of the product. If you press a selection
button, the activated function is displayed
in the display.
The functions that are available depend
on whether a controller is connected to the
product.
You can switch back to the basic display
by:
–Pressing to exit the selection levels
–Not pressing any button for longer than
15 minutes.
If there is an error message present, the
basic displays switches to the error mes-
sage.
3.9 Operating levels
The product has two operating levels.
–The end user level contains information
and setting options that you require as
the end user.
–The installer level is reserved for the
competent person. It is protected by
a code. Only competent persons may
change any settings in the installer
level.
3.10 Menu display
Menu
Live monitor
Information
Reset anti-cycl. time
Back Select
1
4
3
2
1 Scroll bar
2 Current assign-
ment of the
and buttons.
3 Selection level
list entries
4 Name of the se-
lection level
You can find an overview of the menu
structure in the appendix.
Operator level –overview (→Page 15)
4 Operation
4.1 Opening the isolator devices
1. Ask the competent person who in-
stalled the product to explain to you
where these isolator devices are loc-
ated and how to handle them.
2. Open the gas isolator cock fully.
3. Check that the heating installation flow
and return service valves are open, if
such service valves are installed.

Operation 4
0020239012_02 ecoTEC plus Operating instructions 11
4.2 Opening and closing the front
flap
1. Take hold of the recessed handle in
the front flap.
2. Fold down the front flap.
3. Close the front flap after re-actuating
the control elements.
4.3 Switching on the product
▶Switch on the product via the main
switch installed on-site.
4.4 Setting the language
1. Press and hold and at the same
time.
2. Also briefly press .
3. Press and hold and until the
display shows the language setting.
4. Select the required language by press-
ing or .
5. Confirm by pressing .
6. Once you have set the correct lan-
guage, press again to confirm this.
4.5 Setting the hot water
temperature
Applicability: Domestic hot water cylinder
Conditions: Water hardness: > 3.57 mol/m³
▶Have a competent person take appro-
priate measures to protect against Le-
gionella.
▶Set the hot water temperature to a
maximum of 50 °C.
45
DHW temperature
Back
1. Press ( ).
◁The set hot water temperature
flashes in the display.
Conditions: No controller connected
▶Change the hot water temperature by
pressing or .
▶Confirm by pressing .
Conditions: Controller connected
▶Use to set the maximum possible hot
water temperature on the product.
▶Confirm by pressing .
▶Set the required hot water temperature
on the controller (→Controller operating
instructions).
4.6 Setting the heating flow
temperature
60
Target flow temp.
Back
1. Press ( ).
◁The target value of the heating flow
temperature appears on the display.
Note
The competent person may
have adjusted the maximum
possible temperature.
Conditions: No controller connected
▶Use or to set the required heating
flow temperature.
▶Confirm by pressing .
Conditions: Controller connected
▶Set the maximum possible heating flow
temperature on the product.
▶Confirm by pressing .
▶Set the required heating flow temperat-
ure on the controller (→Controller oper-
ating instructions).

5 Detecting and rectifying faults
12 Operating instructions ecoTEC plus 0020239012_02
4.7 Switching off heating mode
(Summer mode)
Heating off
Target flow temp.
Cancel OK
1. To switch off heating mode without
switching off the hot water generation,
press ( ).
◁The value of the heating flow tem-
perature appears in the display.
2. Use the button to set the heating
flow temperature to Heating off.
3. Confirm by pressing .
◁Heating mode is switched off
◁The symbol appears in the
display.
4.8 Protecting the heating
installation against frost
4.8.1 Frost protection function
Caution.
Risk of material damage due
to frost.
The frost protection function
cannot guarantee flow through
the entire heating installation,
which means that parts of the
heating installation may freeze
and therefore become dam-
aged.
▶During a period of frost, en-
sure that the heating installa-
tion remains in operation and
that all rooms are sufficiently
heated, even when you are
away.
Note
To keep the frost protection
devices active, you should switch
your product on and off using the
controller, if one is provided.
If the heating flow temperature falls be-
low 5 °C when the on/off button is on, the
product comes into operation and heats
the circulating water to approx. 30 °C on
both the heating side and the hot water
side (if available).
4.8.2 Draining the heating
installation
Another way to protect the heating install-
ation and the product from frost for very
long switch-off times is to drain them com-
pletely.
▶Consult a competent person about this.
5 Detecting and rectifying
faults
▶If faults occur or fault messages are
displayed (F.xx), proceed as set out in
the table in the appendix.
Troubleshooting (→Page 15)
▶If the product is not functioning cor-
rectly, contact a competent person.
6 Calling up (Live Monitor)
status codes
1. Press and at the same time.
◁The menu is called up.
2. Navigate to the Live monitor menu
item and press .
◁The current operating status (status
code) is shown on the display.

Care and maintenance 7
0020239012_02 ecoTEC plus Operating instructions 13
7 Care and maintenance
7.1 Maintenance
An annual inspection of the product carried
out by a competent person is a prerequis-
ite for ensuring that the product is perman-
ently ready and safe for operation, reliable,
and has a long working life.
After servicing, complete the relevant
service interval record section of the
benchmark checklist, located at the rear of
the installation manual.
7.2 Caring for the product
Caution.
Risk of material damage
caused by unsuitable clean-
ing agents.
▶Do not use sprays, scouring
agents, detergents, solvents
or cleaning agents that con-
tain chlorine.
▶Clean the casing with a damp cloth and
a little solvent-free soap.
7.3 Checking the condensate
drain pipework and tundish
The condensate drain pipework and tun-
dish must always be penetrable.
▶Regularly check the condensate drain
pipework and tundish for faults and,
particularly, for blockages.
You must not be able to see or feel any
obstructions in the condensate drain pipe-
work and tundish.
▶If you notice a fault, have it rectified by
a competent person.
7.4 Reading maintenance
messages
If the symbol is shown in the display, the
product requires maintenance work. The
product is not in fault mode but continues
to operate.
▶Consult a competent person.
8 Decommissioning
8.1 Temporarily decommissioning
the product
▶Switch off the product via the main
switch installed on-site.
◁The display goes out.
▶When decommissioning the product for
an extended period (e.g. holiday), also
close the gas isolator cock.
8.2 Permanently
decommissioning the product
▶Have a competent person permanently
decommission the product.
9 Recycling and disposal
▶The competent person who installed
your product is responsible for the dis-
posal of the packaging.
If the product is identified with this
symbol:
▶In this case, do not dispose of the
product with the household waste.
▶Instead, hand in the product to a collec-
tion centre for old electrical or electronic
appliances.
Caution.
Risk of material damage due
to frost.
The frost protection and mon-
itoring devices are only active
while the unit is connected to
the power mains and the gas
isolator cock is open.
▶Temporarily decommission
the product only if no frost is
expected.

10 Guarantee and customer service
14 Operating instructions ecoTEC plus 0020239012_02
If the product contains batteries that
are marked with this symbol, these bat-
teries may contain substances that are
hazardous to human health and the envir-
onment.
▶In this case, dispose of the batteries at
a collection point for batteries.
10 Guarantee and customer
service
10.1 Guarantee
–Two year guarantee for ecoTEC plus
appliances
Vaillant provides this appliance with a
parts and labour guarantee against defects
that may occur within twenty-four months
of the installation date. For the 2nd year of
the guarantee to be valid an annual ser-
vice must be carried out by a competent
person approved at the time by the Health
and Safety Executive one year after install-
ation. The cost of this annual service is not
included in the guarantee.
–Registering with us
Registration is simple. Just complete the
Guarantee Registration Card and return to
Vaillant within 30 days of installation. Your
details will then be automatically registered
within the Vaillant scheme.
–Immediate help
If your Vaillant boiler develops a fault your
first action should be to contact your in-
staller, as his professional assessment is
needed under the terms of our Guarantee.
If you are unable to contact your installer,
phone Vaillant Service Solutions:
Telephone: [phone]
10.2 Customer service
To ensure regular servicing, it is strongly
recommended that arrangements are
made for a Maintenance Agreement.
Please contact Vaillant Service Solutions
for further details:
Telephone: [phone]

Appendix
0020239012_02 ecoTEC plus Operating instructions 15
Appendix
A Operator level –overview
Setting level Values Unit Increment, select Default
setting
Min. Max.
Live Monitor →
Status Current value
Information →
Contact data Phone num-
ber
Serial number Permanent
value
Display contrast Current value 1 25
15 40
Reset anti-cycl. time →
Current burner anti-
cycling time
Current value min
B Troubleshooting
Fault Cause Measure
Product does not
start up:
–No hot water
–Heating re-
mains cold
The gas isolator cock installed on-site
and/or the gas isolator cock on the
product is closed.
Open both gas isolator cocks.
The power supply in the building is dis-
connected.
Check the fuse in the building.
The product switches on automat-
ically when the power is restored.
The product is switched off. Switch on the product.
The heating flow temperature is set
too low or to the Heating off position,
and/or the hot water temperature is set
too low.
Set the heating flow and hot water
temperature.
There is air in the heating installation. Have a competent person purge
the heating installation.
After three unsuccessful ignition at-
tempts, the product switches to fault
mode (fault message: F.28).
Press the fault clearance key for
one second. The product makes
another attempt to ignite the
flame.
If you have been unable to elim-
inate the ignition fault after three
fault clearance attempts, consult a
competent person.
There is a fault in the flue gas route. Have a competent person rectify
the fault.

Appendix
16 Operating instructions ecoTEC plus 0020239012_02
Fault Cause Measure
Heating does not
start.
The external controller is not set cor-
rectly.
Set the external controller cor-
rectly (→Controller operating in-
structions).

0020239012_02 04.07.2019
supplier
Vaillant Ltd.
Nottingham Road Belper Derbyshire DE56 1JT
Telephone [phone]
[email protected] www.vaillant.co.uk
© These instructions, or parts thereof, are protected by copyright and may be
reproduced or distributed only with the manufacturer's written consent.
We reserve the right to make technical changes.
0020239012_02