Vaillant ecoFIT sustain 835 User manual

For the operator
Operating instructions
ecoFIT sustain
825 - 835
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 ecoFIT sustain 0020230530_01
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 Front view ...................................... 7
3.2 Control elements............................ 7
3.3 Displayed symbols......................... 8
3.4 Information on the identification
plate ............................................... 8
3.5 Serial number ................................ 9
3.6 CE label ......................................... 9
3.7 Benchmark..................................... 9
4 Operation.................................... 10
4.1 Operating concept ....................... 10
4.2 Basic display................................ 10
4.3 Adjustment and display levels ..... 10
4.4 Cabinet-type casing ..................... 11
4.5 Opening the isolator devices ....... 11
4.6 Starting up the product ................ 11
4.7 Switching on the product ............. 11
4.8 Setting the heating flow
temperature ................................. 11
4.9 Setting the hot water
temperature ................................. 11
4.10 Switching Comfort mode on and
off................................................. 12
4.11 Switching off the product's
functions ...................................... 12
4.12 Guaranteeing the correct
filling pressure of the heating
system ......................................... 12
4.13 Protecting the heating
installation against frost ............... 13
4.14 Switching the product to
standby mode .............................. 14
5 Troubleshooting ........................ 14
5.1 Detecting and rectifying faults...... 14
5.2 Calling up (Live monitor) status
codes ........................................... 14
6 Care and maintenance .............. 14
6.1 Maintenance ................................ 14
6.2 Caring for the product .................. 14
6.3 Reading maintenance
messages .................................... 14
6.4 Checking the condensate drain
pipework and tundish................... 14
7 Decommissioning...................... 15
7.1 Temporarily decommissioning
the product................................... 15
7.2 Permanently decommissioning
the product................................... 15
8 Recycling and disposal............. 15
9 Guarantee and customer
service ........................................ 15
9.1 Guarantee.................................... 15
9.2 Customer service......................... 15
Appendix ............................................... 16
A Status codes –Overview........... 16
B Troubleshooting ........................ 16

Safety 1
0020230530_01 ecoFIT sustain 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 heat-
ing installations and for hot wa-
ter 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 ecoFIT sustain 0020230530_01
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 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 National Grid
[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
0020230530_01 ecoFIT sustain 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 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
1.3.7 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.
1.3.8 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 Safety
6Operating instructions ecoFIT sustain 0020230530_01
1.3.9 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
0020230530_01 ecoFIT sustain 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
VUW 256/6-3
(H-GB) 0010020392 47-044-71
VUW 306/6-3
(H-GB) 0010020393 47-044-72
VUW 356/6-3
(H-GB) 0010020394 47-044-73
3 Product description
3.1 Front view
1
2
1 Control elements 2 Plate with serial
number on the
rear
3.2 Control elements
50
1
2
3
1 Fault clearance
key
2 Operating but-
tons
3 Display
3.2.1 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

3 Product description
8Operating instructions ecoFIT sustain 0020230530_01
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
3.3 Displayed symbols
Sym-
bol
Meaning Explanation
Burner operating
correctly
Burner on
bar
Current filling
pressure of the
heating system
The dashed lines
show the permit-
ted range
–Permanently
on: Filling
pressure in
the permitted
range
–Flashing:
Filling pres-
sure outside
the permitted
range
Hot water gener-
ation active
–Permanently
on: Draw-off
mode before
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
Comfort mode
active
–Permanently
on: Comfort
mode active
–Flashing:
Comfort mode
active, burner
on
Maintenance re-
quired
Information on
the maintenance
message in the
"Live Monitor"
Sym-
bol
Meaning Explanation
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
Appears instead
of the basic
display, may be
an explanatory
plain text display.
3.4 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
ecoFIT sustain
8..
Product designation
2H, G20
–2 kPa
(20 mbar)
Factory setting for type of
gas and gas connection
pressure
Cat. Unit category

Product description 3
0020230530_01 ecoFIT sustain Operating instructions 9
Information
on the identi-
fication plate
Meaning
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
Hot water generation
Pn Nominal heat output range
in heating mode
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
3.5 Serial number
The serial number is located on a plastic
plate at the bottom of the front casing.
3.6 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.
3.7 Benchmark
Vaillant is a licensed member of the
Benchmark Scheme which aims to im-
prove the standards of installation and
commissioning of domestic heating and
hot water systems in the UK and to en-
courage regular servicing to optimise
safety, efficiency and performance.
Benchmark is managed and promoted
by the Heating and Hotwater Industry
Council. For more information visit
www.benchmark.org.uk.
▶Please ensure that the installer has fully
completed the Benchmark Checklist on
the inside back pages of the installation
instructions supplied with the product
and that you have signed it to say that
you have received a full and clear ex-
planation of its operation. The installer
is legally required to complete a com-
missioning checklist as a means of
complying with the appropriate Build-
ing Regulations (England and Wales).
All installations must be notified to Local
Area Building Control either directly or
through a Competent Persons Scheme.
A Building Regulations Compliance Certi-
ficate will then be issued to the customer

4 Operation
10 Operating instructions ecoFIT sustain 0020230530_01
who should, on receipt, write the Notifica-
tion Number on the Benchmark Checklist.
This product should be serviced regularly
to optimise its safety, efficiency and per-
formance. The service engineer should
complete the relevant Service Record on
the Benchmark Checklist after each ser-
vice.
The Benchmark Checklist will be required
in the event of any warranty.
4 Operation
4.1 Operating concept
Op-
erator
control
element
Function
–Setting the hot water temperat-
ure
–Cancelling the activation of an
operating mode
–Cancelling a change to a set
value
–Going one selection level
higher
–Setting the heating flow tem-
perature
–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 but-
tons 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 procedure at
any time.
4.2 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.
4.3 Adjustment and display levels
The product has two adjustment and
display levels.
The end user level contains information
and setting options that you require as the
end user.
The installer level is reserved for the com-
petent person. It is protected by a code.
Only competent persons may change any
settings in the installer level.