Vaillant ecoTEC exclusive 620 User manual

For the operator
Operating instructions
ecoTEC exclusive
620 (VU 206/5‑7 (H-GB))
627 (VU 256/5‑7 (H-GB))
835 (VUW 356/5‑7 (H-GB))
843 (VUW 436/5‑7 (H-GB))
GB, IE
Operating instructions
Publisher/manufacturer
Vaillant GmbH
Berghauser Str. 40 D-42859 Remscheid
Tel. [phone]‑0 Fax [phone]‑28 10
[email protected] www.vaillant.de

Contents
2Operating instructions ecoTEC exclusive 0020193967_00
Contents
1 Safety .................................................................... 3
1.1 Action-related warnings ......................................... 3
1.2 Intended use .......................................................... 3
1.3 General safety information .................................... 3
2 Notes on the documentation .............................. 5
2.1 Observing other applicable documents ................. 5
2.2 Storing documents................................................. 5
2.3 Applicability of the instructions .............................. 5
3 Product description............................................. 5
3.1 Product design....................................................... 5
3.2 Control elements.................................................... 5
3.3 Operator control panel........................................... 5
3.4 Displayed symbols................................................. 6
3.5 Information on the identification plate.................... 6
3.6 Serial number ........................................................ 6
3.7 CE label ................................................................. 6
3.8 Energy Saving Trust Endorsed Products .............. 6
4 Operation.............................................................. 7
4.1 Operating concept ................................................. 7
4.2 Basic display.......................................................... 7
4.3 Menu display.......................................................... 7
4.4 Operating levels..................................................... 7
4.5 Cabinet-type casing............................................... 7
4.6 Opening the isolator devices ................................. 7
4.7 Starting up the product .......................................... 7
4.8 Switching on the product ....................................... 8
4.9 Setting the language.............................................. 8
4.10 Setting the hot water temperature ......................... 8
4.11 Setting the heating flow temperature..................... 8
4.12 Switching Green iQ mode on and off .................... 8
4.13 Guaranteeing the correct filling pressure of the
heating system....................................................... 9
4.14 Switching off the product's functions ................... 10
4.15 Protecting the heating installation against
frost...................................................................... 10
5 Detecting and rectifying faults ......................... 10
6 Calling up (Live monitor) status codes ........... 10
7 Care and maintenance ...................................... 10
7.1 Maintenance ........................................................ 10
7.2 Caring for the product.......................................... 10
7.3 Reading maintenance messages ........................ 11
7.4 Checking the condensate drain pipework and
tundish ................................................................. 11
8 Decommissioning.............................................. 11
8.1 Temporarily decommissioning the product.......... 11
8.2 Permanently decommissioning the product......... 11
9 Recycling and disposal..................................... 11
10 Guarantee and customer service..................... 11
10.1 Guarantee............................................................ 11
10.2 Customer service................................................. 11
Appendix ............................................................................ 12
A Operator level –overview ................................. 12
B Troubleshooting ................................................ 12
C Status codes –Overview .................................. 13

Safety 1
0020193967_00 ecoTEC exclusive Operating instructions 3
1 Safety
1.1 Action-related warnings
Classification of action-related warnings
The action-related warnings are classified in
accordance with the severity of the possible
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 environmental
damage
1.2 Intended use
There is a risk of injury or death to the user or
others, or of damage to the product and other
property in the event of improper use or use
for which it is not intended.
The product is intended as a heat generator
for closed heating installations and for hot
water generation.
Intended use includes the following:
–observance of the operating instructions
included for the product and any other
system components
–compliance with all inspection and main-
tenance conditions listed in the instruc-
tions.
This product can be used by children aged
from 8 years and above and persons with
reduced physical, sensory or mental capabil-
ities or lack of experience and knowledge if
they have been given supervision or instruc-
tion concerning use of the product in a safe
way and understand the hazards involved.
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 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.
Caution.
Improper use of any kind is prohibited.
1.3 General safety information
1.3.1 Installation by competent persons
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 applicable documents, par-
ticularly the "Safety" section and the warn-
ings.
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, doorbells, telephones or other com-
munication 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 isolator cock on
the product.
▶Warn other occupants in the building by
yelling or banging on doors or walls.
▶Leave the building immediately and ensure
that others do not enter the building.
▶Notify the gas supply company or National
Grid Transco [phone] by tele-
phone from outside of the building.

1 Safety
4Operating instructions ecoTEC exclusive 0020193967_00
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 prop-
erty:
▶Open all accessible doors and windows
fully to provide ventilation.
▶Switch off the product.
▶Inform a competent person.
1.3.5 Risk of death from escaping flue
gas
If you operate the product with an empty con-
densate siphon, flue gas may escape into the
room air.
▶In order to operate the product, ensure that
the condensate siphon is always full.
1.3.6 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
installation room of the product.
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 alter the safety devices in any way.
▶Do not damage or remove any seals on
components.
▶Do not make any changes:
–The product itself
–to the gas, air, water and electricity sup-
plies
–to the entire flue gas installation
–to the entire condensate drain system
–to the expansion relief valve
–to the drain lines
–to constructional conditions that may
affect the operational reliability of the
product
1.3.8 Risk of poisoning caused by
insufficient supply of combustion
air
Conditions: Open-flued operation
▶Ensure that there is a sufficient supply of
combustion air.
1.3.9 Risk of corrosion damage due to
unsuitable combustion and room air
Sprays, solvents, chlorinated cleaning
agents, paint, adhesives, ammonia com-
pounds, 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 substances are
stored at the installation site.
1.3.10 Risk of material damage caused by
frost
▶Ensure that the heating installation always
remains in operation during freezing con-
ditions and that all rooms are sufficiently
heated.
▶If you cannot ensure the operation, have a
competent person drain the heating install-
ation.
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 spe-
cified.

Notes on the documentation 2
0020193967_00 ecoTEC exclusive Operating instructions 5
2 Notes on the documentation
2.1 Observing other applicable documents
▶You must observe all operating instructions enclosed with
the system components.
2.2 Storing documents
▶Keep this manual and all other applicable documents
safe for future use.
2.3 Applicability of the instructions
These instructions apply only to:
Product article number
Article num-
ber
Gas Council
Number
620 (VU 206/5‑7 (H-GB))
ecoTEC exclusive
0010017062 41-694-01
627 (VU 256/5‑7 (H-GB))
ecoTEC exclusive
0010017063 41-694-02
835 (VUW 356/5‑7 (H-
GB)) ecoTEC exclusive
0010017064 47-044-66
843 (VUW 436/5‑7 (H-
GB)) ecoTEC exclusive
0010017065 47-044-67
3 Product description
3.1 Product design
1
2
3
1 Control elements
2 Plate with serial number
on the rear
3 Front flap
3.2 Control elements
50
5
4 3 2 1
1 On/off button
2 Built-in controller (ac-
cessory)
3Fault clearance
button
4 Operating buttons
5 Display
3.3 Operator control panel
50
1
8
7
6
5
2
3
4
1 Current heating flow
temperature, filling
pressure of the heating
installation, operating
mode, fault code or
additional information
2 Current assignment of
the right-hand selection
button
3 Left- and right-hand
selection buttons
4and button
5 Maximum output op-
eration (for chimney
sweeps only)
6 Access to the menu for
additional information
7 Current assignment of
the left-hand selection
button
8 Active operating status
The display lights up
–if you switch on the product or

3 Product description
6Operating instructions ecoTEC exclusive 0020193967_00
–if you press a button while the product is switched on.
At first, pressing this button does not trigger any other
function.
The light goes out after one minute if you do not press any
button.
3.4 Displayed symbols
Symbol Meaning Explanation
Burner operating cor-
rectly
Burner on
Current burner modula-
tion rate
bar
Current filling pressure of
the heating system
The dashed lines show
the permitted range.
–Permanently on:
Filling pressure in
the permitted range.
–Flashing: Filling
pressure outside
the permitted range.
Hot water generation
active
–Permanently on:
Draw-off mode be-
fore burner is on
–Flashing: Burner on
in draw-off mode
Heating mode active –Permanently on:
Heating mode heat
requirement
–Flashing: Burner on
in heating mode
Green iQ mode active –Permanently on:
Energy-saving mode
active
Maintenance required Information on mainten-
ance message in the
"Live Monitor".
Summer mode active
Heating mode is
switched off
Burner anti-cycling 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 Appears instead of the
basic display, may be
an explanatory plain text
display.
3.5 Information on the identification plate
The identification plate is mounted on the underside of the
product in the factory.
Information on the
identification plate
Meaning
Read the instructions.
VU(W) ... Type designation
..6/5-7 Calorific value power/product generation
equipment
ecoTEC exclusive Product description
2H, G20 –20 mbar
(2.0 kPa)
Gas group and gas connection pressure
as set at the factory
ww/yyyy Date of manufacture: Week/year
Information on the
identification plate
Meaning
Cat. Approved unit categories
Types Approved gas-fired units
PMS Permissible total overpressure in heating
mode
PMW Permissible total overpressure during hot
water generation
Tmax. Max. flow temperature
ED 92/42 Current efficiency directive fulfilled with
4* rating
V Hz Mains voltage and mains frequency
W Max. electrical power consumption
IP Level of protection
Heating mode
Hot water generation
P Nominal heat output range
Q Heat input range
D Nominal hot water draw-off rate
Bar code with serial number,
7th to 16th digit = product article number
3.6 Serial number
The serial number is located on a plate behind the front flap.
The plate is in a plastic fish plate. You can also display the
serial number in the display.
3.7 CE label
The CE label shows that the products comply with the basic
requirements of the applicable directives as stated on the
identification plate.
The declaration of conformity can be viewed at the manufac-
turer's site.
3.8 Energy Saving Trust Endorsed Products
Only the most energy efficient products can carry the
‘Energy Saving Trust Endorsed Product’ brandmark making
it easy for consumers to choose products that have met strict
energy performance criteria.
Available for: Boilers, Heating controls and chemical inhib-
itors, the Energy Saving Trust endorsed product brandmark
gives consumers confidence that a product will cost less to
run, help lower energy bills and reduce carbon emissions.
About the Energy Saving Trust
Energy Saving Trust is an independent and impartial organ-
isation that provides trusted energy saving advice to em-
power millions of people to lead affordable, low energy life-
styles. For more information visit energysavingtrust.org.uk

Operation 4
0020193967_00 ecoTEC exclusive Operating instructions 7
4 Operation
4.1 Operating concept
Operator
control
element
Function
–Setting the hot water temperature
–Cancelling the activation of an operating
mode
–Cancelling a change to a set value
–Going one selection level higher
–Setting the heating flow temperature
–Reading the system pressure
–Activating the comfort mode
–Activating the operating mode
–Confirm setting
–Going one selection level lower
+ at
the same
time
–Calling up the menu
or –Reducing or increasing the set value
–Scrolling through menu entries
The current function of the and buttons is shown in
the display.
Adjustable values are always displayed as flashing.
You must always confirm a change to a value. Only then is
the new setting saved. You can press to cancel a proced-
ure.
4.2 Basic display
50
The basic display shows the current condition of the product.
If you press a selection button, the activated function is dis-
played in the display.
The functions that are available depend on whether a con-
troller 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 message.
4.3 Menu display
Xxxx
Xxxxxxxxxxx
Xxxx Xxxxxxx
Xxxxxxxxxx
xxxxxx Xxxxxxx
1
4
3
2
1 Scroll bar
2 Current assignment of
the and buttons.
3 Selection level list
entries
4 Name of the selection
level
You can find an overview of the menu structure in the ap-
pendix.
Operator level –overview (→Page 12)
4.4 Operating levels
The product has two operating levels.
The operating level for the operator shows information and
offers set-up options that do not require any special prior
knowledge.
The operating level for the competent person is protected by
a code.
Operator level –overview (→Page 12)
4.5 Cabinet-type casing
Enclosing the product in cabinet-type casing requires compli-
ance with the applicable design instructions.
If you require cabinet-type casing for your product, consult
a heating specialist company. Never, under any circum-
stances, enclose the product yourself.
4.6 Opening the isolator devices
1. Ask the competent person who installed the product to
explain to you where these isolator devices are located
and how to handle them.
2. Open the gas isolator cock fully.
3. Open the service valves in the heating installation's flow
and return.
Conditions: Product with integrated hot water generation
▶Open the cold water stop valve.
4.7 Starting up the product
▶Only start up the product once the casing has been com-
pletely closed.

4 Operation
8Operating instructions ecoTEC exclusive 0020193967_00
4.8 Switching on the product
50
2
1
▶Press the on/off button (1).
◁The "Basic display" (→Page 7) (2) appears on the
display.
4.9 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 pressing or .
5. Confirm by pressing .
6. Once you have set the correct language, press
again to confirm this.
4.10 Setting the hot water temperature
Conditions: Water hardness: > 3.57 mol/m³
▶Have a competent person take appropriate measures to
protect against Legionella.
▶Set the hot water temperature to a maximum of 50 °C.
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 temper-
ature on the product.
▶Confirm by pressing .
▶Set the required hot water temperature on the controller
(→Controller operating instructions).
4.11 Setting the heating flow temperature
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 temperat-
ure.
▶Confirm by pressing .
Conditions: Controller connected
▶Set the maximum possible heating flow temperature on
the product.
▶Confirm by pressing .
▶Set the required heating flow temperature on the control-
ler (→Controller operating instructions).
4.12 Switching Green iQ mode on and off
Note
Green iQ mode is an energy-saving operating
mode. If this mode is activated, the product oper-
ates in the heating and cylinder charging mode in
such a way that the maximum benefits associated
with condensing technology are achieved.
1. Press and at the same time.
◁The menu is called up.
2. Navigate to the Green iQ menu item and press .
–Menu →Basic settings →Green iQ
3. Press or to activate or deactivate Green iQ
mode respectively.
◁Mode on or Mode off will flash on the display.
4. Confirm by pressing .
◁If you have activated Green iQ mode, the symbol
will appear on the basic display. If you have deactiv-
ated Green iQ mode, the symbol will disappear
from the basic display.

Operation 4
0020193967_00 ecoTEC exclusive Operating instructions 9
4.13 Guaranteeing the correct filling pressure of
the heating system
4.13.1 Checking the filling pressure of the heating
installation
Note
To ensure that the heating installation operates
smoothly, the filling pressure when the heating
installation is cold must be between 0.1 MPa and
0.2 MPa (1.0 bar and 2.0 bar) or lie between the
two dashed lines in the bar graph display.
If the heating installation extends over several
storeys, a higher filling pressure may be required
for the heating installation. Ask a competent per-
son for details.
In addition, the symbol appears after approx.
one minute.
If the filling pressure in the heating installation
falls below 0.05 MPa (0.5 bar), then the product
switches off. The display alternates between the
fault message F.22 and the current filling pres-
sure.
1. Press twice.
◁The values for the current filling pressure and for the
minimum and maximum filling pressures appear in
the display.
2. Check the filling pressure in the display.
1 / 2
System pressure: 0.1 … 0.2 MPa (1.0 … 2.0 bar)
The filling pressure is in the intended pressure range.
2 / 2
Filling pressure: < 0.08 MPa (< 0.80 bar)
▶Fill the heating installation. (→Page 9)
◁If you have topped up the installation with suf-
ficient heating water, the display automatically
disappears after 20 seconds.
4.13.2 Filling the heating installation
Caution.
Risk of material damage due to heating
water that is extremely calciferous or cor-
rosive or contaminated by chemicals.
Unsuitable tap water damages the seals
and diaphragms, blocks components in the
product and heating installation through
which the water flows and causes noise.
▶Only fill the heating installation with suit-
able heating water.
▶In case of doubt, ask a competent person
for details.
1. Ask a competent person where the filling cock is loc-
ated.
2. Open all radiator valves (thermostatic radiator valves) of
the heating installation.
Conditions: Product for heating mode only
▶Connect the filling cock to a hot water supply in the way
you were told by the competent person.
▶Open the hot water supply.
▶Turn the filling cock on slowly and allow water to flow in
until the required filling pressure has been reached.
▶Close the hot water supply.
▶Purge all radiators.
▶Check the filling pressure in the display.
▶Top up with more water if necessary.
▶Close the hot water supply.
Conditions: Product with integrated hot water generation and filling loop
A
B
1
4
3
2
▶Fit the double non-return valve (1) of the filling line to
the cold water stop valve and secure the valve with the
spring clip (2).
▶To fill, first open the stop valve (3).
▶Slowly open the stop valve (4) so that the water flows
into the heating system. Fill it with water until the re-
quired filling pressure is reached.
▶Close the stop valve (4).
▶Purge all radiators.
▶Check the filling pressure in the display.
▶Top up with more water if necessary.
▶After filling, close both stop valves and disconnect the
filling device by removing the double non-return valve
from the cold water stop valve.
Note
Both stop valves must be closed while the
heating system is operating and the filling line
must be removed from the double non-return
valve again.
3. Return to the basic display. (→Page 7)

5 Detecting and rectifying faults
10 Operating instructions ecoTEC exclusive 0020193967_00
4.14 Switching off the product's functions
4.14.1 Switching off hot water generation
Applicability: Product with hot water generation through external domestic
hot water cylinder
1. To switch off cylinder charging without switching off
heating mode, press ( ).
◁The set hot water temperature flashes in the display.
2. Use the button to set the hot water temperature to
Cylinder charging off.
3. Confirm by pressing .
◁Cylinder charging is switched off.
◁Only the frost protection function for the cylinder
remains active.
4.14.2 Switching off heating mode (Summer
mode)
1. To switch off heating mode without switching off hot
water generation, press ( ).
◁The value of the heating flow temperature 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.
4.15 Protecting the heating installation against
frost
4.15.1 Frost protection function
Caution.
Risk of material damage due to frost.
The frost protection function cannot guaran-
tee flow through the entire heating installa-
tion, which means that parts of the heating
installation may freeze and therefore become
damaged.
▶During a period of frost, ensure that the
heating installation 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 below 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 heat-
ing side and the hot water side (if available).
4.15.2 Draining the heating installation
Another way to protect the heating installation and the
product from frost for very long switch-off times is to drain
them completely.
▶Consult a competent person about this.
5 Detecting and rectifying faults
▶If faults occur, proceed in accordance with the table in
the appendix.
Troubleshooting (→Page 12)
▶If you are unable to eliminate the faults using the spe-
cified measures, if fault messages (F.xx) are displayed,
or if the product does not function correctly, 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 Menu →Live monitor and confirm by
pressing .
Status codes –Overview (→Page 13)
7 Care and maintenance
7.1 Maintenance
An annual inspection of the product carried out by a compet-
ent person is a prerequisite for ensuring that the product is
permanently ready and safe for operation, reliable, and has a
long working life.
7.2 Caring for the product
Caution.
Risk of material damage caused by un-
suitable cleaning agents.
▶Do not use sprays, scouring agents, de-
tergents, solvents or cleaning agents that
contain chlorine.
▶Clean the casing with a damp cloth and a little solvent-
free soap.