Installation and maintenance instructions
For the competent person
Installation and maintenance instructions
Publisher/Manufacturer
Vaillant GmbH
Berghauser Str. 40 D-42859 Remscheid
Tel. +49 21 91 18‑0 Fax +49 21 91 18‑2810
info@vaillant.de www.vaillant.de
ecoTEC plus
VU GB 656/4-5 A
GB, IE
Contents
Contents
1 Safety .................................................................... 4
1.1 Action-related warnings ......................................... 4
1.2 Intended use.......................................................... 4
1.3 General safety information .................................... 4
1.4 Regulations (directives, laws, standards) .............. 6
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
2.4 Benchmark............................................................. 7
3 Product description............................................. 7
3.1 Functional elements............................................... 7
3.2 Information on the identification plate.................... 7
3.3 Serial number ........................................................ 8
3.4 CE label ................................................................. 8
4 Installation............................................................ 8
4.1 Unpacking the product........................................... 8
4.2 Checking the scope of delivery.............................. 8
4.3 Transporting the product ....................................... 8
4.4 Product dimensions and connection
dimensions............................................................. 9
4.5 Minimum clearances and installation
clearances ............................................................. 9
4.6 Clearance from combustible components ............. 9
4.7 Using the installation template............................... 9
4.8 Wall-mounting the product................................... 10
4.9 Removing or installing the front casing................ 10
5 Installation.......................................................... 10
5.1 Selecting a low loss header ................................. 11
5.2 Gas installation .................................................... 12
5.3 Hydraulics installation.......................................... 13
5.4 Installing the air/flue pipe ..................................... 14
5.5 Installing and connecting the flue pipe ................ 14
5.6 Electrical installation ............................................ 14
6 Start-up ............................................................... 16
6.1 Carrying out the initial start-up............................. 16
6.2 Switching on the product ..................................... 16
6.3 Using check programmes.................................... 16
6.4 Checking and treating the heating water/filling
and supplementary water .................................... 17
6.5 Reading off the filling pressure ............................ 18
6.6 Reading off the filling pressure ............................ 18
6.7 Preventing low water pressure ............................ 18
6.8 Filling and purging the heating installation .......... 18
6.9 Flushing the heating installation for the first
time ("cold") ......................................................... 19
6.10 Filling the condensate siphon .............................. 19
6.11 Filling the condensate trap .................................. 19
6.12 Gas ratio setting................................................... 19
6.13 Checking leak-tightness ...................................... 22
6.14 Thoroughly flushing the heating installation
("hot")................................................................... 22
7 Adapting the unit to the heating
installation.......................................................... 23
7.1 Calling up diagnostics codes ............................... 23
7.2 Calling up the installer level (second
diagnostics level) ................................................. 23
7.3 Setting the heating partial load ............................ 23
7.4 Setting the pump overrun and pump operating
mode.................................................................... 23
7.5 Setting the maximum flow temperature ............... 24
7.6 Setting the burner anti-cycling time ..................... 24
7.7 Setting the maintenance interval ......................... 24
7.8 Pump diagram ..................................................... 24
7.9 Adjusting the product to large flue gas pipe
lengths ................................................................. 25
7.10 Handing the product over to the operator ............ 25
8 Inspection and maintenance ............................ 25
8.1 Observing inspection and maintenance
intervals ............................................................... 25
8.2 Procuring spare parts .......................................... 26
8.3 Removing the compact thermal module .............. 26
8.4 Cleaning the heat exchanger............................... 26
8.5 Descaling the heat exchanger ............................. 27
8.6 Checking the burner ............................................ 27
8.7 Cleaning the condensate duct ............................. 27
8.8 Cleaning the air separation system ..................... 28
8.9 Installing the compact thermal module ................ 28
8.10 Draining the product ............................................ 28
8.11 Checking the pre-charge pressure of the
external expansion vessel ................................... 29
8.12 Completing inspection and maintenance work .... 29
8.13 Checking the product for leak-tightness .............. 29
9 Troubleshooting ................................................ 29
9.1 Contacting your service partner........................... 29
9.2 Calling up status codes........................................ 29
9.3 Reading off the fault codes .................................. 29
9.4 Querying the fault memory .................................. 29
9.5 Performing diagnostics ........................................ 29
9.6 Using check programmes.................................... 29
9.7 Resetting parameters to factory settings ............. 29
9.8 Preparing the repair work .................................... 29
9.9 Replacing defective components......................... 30
9.10 Completing repair work........................................ 30
10 Decommissioning the product......................... 30
11 Recycling and disposal..................................... 30
12 Customer service............................................... 30
Appendix ............................................................................ 31
A Overview of diagnostics codes........................ 31
B Inspection and maintenance work –
Overview............................................................. 33
C Status codes – Overview .................................. 34
D Overview of fault codes .................................... 35
E Connection diagram .......................................... 37
F Commissioning Checklist................................. 39
2 Installation and maintenance instructions ecoTEC plus 0020214491_01
G Opening of the flue pipe.................................... 43
G.1 Positioning of the opening of a fan-supported
flue gas guiding.................................................... 43
H Horizontal terminal positioning........................ 44
I Technical data.................................................... 44
Index ................................................................................... 46
Contents
0020214491_01 ecoTEC plus Installation and maintenance instructions 3
1 Safety
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
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 Risk caused by inadequate qualifications
The following work must only be carried out
by competent persons who are sufficiently
qualified to do so:
– Assembly
– Disassembly
– Installation
– Start-up
– Maintenance
– Repair
– Decommissioning
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.
Depending on the gas-fired boiler type, the
products referred to in these instructions
must only be installed and operated in conjunction with the air/flue pipe accessories listed in the other applicable documents.
Intended use includes the following:
– observance of accompanying operating,
installation and servicing instructions for
the product and any other system components
– installing and fitting the product in accord-
ance with the product and system approval
– compliance with all inspection and main-
tenance conditions listed in the instructions.
Intended use also covers installation in accordance with the IP class.
Any other use that is not specified in these
instructions, or use beyond that specified in
▶ Observe all instructions that are included
with the product.
▶ Proceed in accordance with the current
state of technology.
▶ Observe all applicable directives, stand-
ards, laws and other regulations.
1.3.2 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 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 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 the Na-
tional Grid +44 (0) 800 111999 by tele-
4 Installation and maintenance instructions ecoTEC plus 0020214491_01
Safety 1
phone once you are outside of the building.
1.3.3 Risk of death due to blocked or leaking flue gas routes
Installation errors, damage, tampering, unauthorised installation sites or similar can cause
flue gas to escape and result in a risk of poisoning.
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.
▶ Check the flue gas routes in the product
and the flue gas diversions.
1.3.4 Risk of poisoning and burns caused by escaping hot flue gases
▶ Only operate the product if the air/flue pipe
has been completely installed.
▶ With the exception of short periods for
testing purposes, only operate the product
when the front casing is installed and
closed.
1.3.8 Risk of death due to lack of safety devices
The schematic drawings included in this document do not show all safety devices required for correct installation.
▶ Install the necessary safety devices in the
system.
▶ Observe the applicable national and inter-
national laws, standards and guidelines.
1.3.9 Risk of death from electric shock
There is a risk of death from electric shock if
you touch live components.
Before commencing work on the product:
▶ Disconnect the product from the power
supply by switching off all power supplies
(electrical partition with a contact opening
of at least 3 mm, e.g. fuse or line protection switch).
▶ Secure against being switched back on
again.
▶ Wait for at least 3 minutes until the capa-
citors have discharged.
▶ Check that there is no voltage.
1.3.5 Risk of poisoning caused by insufficient supply of combustion air
Conditions: Open-flued operation
▶ Ensure that the air supply to the product's
installation room is permanently unobstructed and sufficient in accordance with the
relevant ventilation requirements.
1.3.6 Risk of death due to cabinet-type casing
Cabinet-type casing can give rise to dangerous situations when used on a product which
is operated with an open flue.
▶ Ensure that the product is supplied with
sufficient combustion air.
1.3.7 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.
1.3.10 Risk of being burned or scalded by hot components
▶ Only carry out work on these components
once they have cooled down.
1.3.11 Risk of death from escaping flue gas
If you operate the product with an empty condensate siphon, flue gas may escape into the
room air.
▶ In order to operate the product, ensure that
the condensate siphon is always full.
1.3.12 Risk of death from escaping flue gas
If you operate the product with an empty condensate siphon, flue gas may escape into the
room air.
▶ In order to operate the product, ensure that
the condensate siphon is always full.
1.3.13 Risk of scalding from hot water
There is a risk of scalding at the hot water
draw-off points if the hot water temperatures
0020214491_01 ecoTEC plus Installation and maintenance instructions 5
1 Safety
are greater than 60 °C. Young children and
elderly persons are particularly at risk, even
at lower temperatures.
▶ Select a moderate set target temperature.
1.3.14 Risk of injury due to the heavy weight of the product
▶ Make sure that the product is transported
by at least two people.
1.3.15 Risk of material damage caused by using an unsuitable tool
▶ Use the correct tool to tighten or loosen
screw connections.
1.3.16 Risk of material damage caused by frost
▶ Do not install the product in rooms prone
to frost.
1.3.19 Risk of damage to the flexible gas pipe
The corrugated gas pipe may become damaged if weight is placed on it.
▶ Do not suspend the compact thermal
module on the flexible gas pipe, for
example during maintenance work.
1.4 Regulations (directives, laws,
standards)
▶ Observe the national regulations, stand-
ards, guidelines and laws.
1.3.17 Risk of corrosion damage due to unsuitable combustion and room air
Sprays, solvents, chlorinated cleaning
agents, paint, adhesives, ammonia compounds, dust or similar substances may lead
to corrosion on the product and in the flue
gas guiding.
▶ 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.
▶ If you are installing the product in
hairdressing salons, painter's or joiner's
workshops, cleaning businesses or similar
locations, choose a separate installation
room in which the room air is technically
free of chemical substances.
1.3.18 Risk of material damage caused by leak detection sprays and liquids
Leak detection sprays and liquids block the
filter of the mass flow sensor on the Venturi,
and thus destroy the mass flow sensor.
▶ During repair work, do not apply any leak
detection sprays or liquids to the covering
cap on the filter of the Venturi.
6 Installation and maintenance instructions ecoTEC plus 0020214491_01
Notes on the documentation 2
1
2
3
4
5
6
7
10
9
8
14
15
11
12
13
16
18
17
2 Notes on the documentation
2.1 Observing other applicable documents
▶ You must observe all the operating and installation in-
structions included with the system components.
2.2 Storing documents
▶ Pass these instructions and all other applicable docu-
ments on to the system operator.
2.3 Applicability of the instructions
These instructions apply only to:
Product article number
VU GB 656/4-5 A
2.4 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. 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
0010017820
3 Product description
3.1 Functional elements
1 Connection for the flue
pipe
2 Integrated condensation
heat exchanger
3 Air intake pipe
4 Compact thermal
module
5 Ignition electrode
6 Water pressure sensor
7 Pump
8 Filling connection (com-
bined filling and emptying valve)
3.2 Information on the identification plate
The identification plate is mounted on the underside of the
product in the factory.
Information on the
identification plate
Serial number for identification; 7th to 16th digits =
VU… Vaillant gas-fired wall-hung boiler for
ecoTEC plus Product description
2H, G20 - 20 mbar
(2 kPa)
Cat. Unit category
Types Gas-fired boiler types
Meaning
product article number
heating
Gas group and gas connection pressure
as set at the factory
9 Connection for expan-
sion vessel
10 Electronics box
11 Condensate trap
12 Filling and drainage tap
flow
13 Connection for expan-
sion relief valve
14 Gas valve
15 Air separator
16 Volume flow sensor
17 Automatic air vent
18 Flow switch with control
lines
0020214491_01 ecoTEC plus Installation and maintenance instructions 7
4 Installation
Information on the
identification plate
PMS Permissible total overpressure in heating
PMW Permissible total overpressure during hot
T
max.
ED 92/42 Current efficiency directive fulfilled with
230 V 50 Hz Electric connection
W Max. electrical power consumption
IP Level of protection
P Nominal heat output range
Q Heat input range
Note
Make absolutely sure that the product is compatible with the gas group at the installation site.
Meaning
mode
water generation
Max. flow temperature
4* rating
Heating mode
3.3 Serial number
The serial number can be found on the identification plate.
3.4 CE label
Number
1
Description
Bag with small parts
4.3 Transporting the product
4.3.1 General
▶ Hold the load as close as possible to your body. Do not
twist your body – instead, reposition your feet.
▶ If the unit is being lifted by two persons, ensure your
movements are coordinated during lifting.
▶ Avoid bending your upper body – do not lean forwards or
to the side.
▶ Wear appropriate cut-resistant and non-slip gloves to
protect yourself against sharp edges and maintain a safe
and secure grip.
▶ If required, get somebody to assist you in this.
4.3.2 Unloading the box from the delivery van
▶ It is recommended that two people lift the unit together.
▶ Lift the box using the straps provided.
▶ Use safe lifting techniques – keep your back straight and
bend your legs at the knee.
▶ Hold the load as close as possible to your body.
▶ If the unit is being lifted by two persons, ensure your
movements are coordinated during lifting.
▶ If required, get somebody to assist you in this.
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 manufacturer's site.
4 Installation
4.1 Unpacking the product
1. Remove the product from its box.
2. Remove the protective film from all parts of the product.
4.2 Checking the scope of delivery
▶ Check that the scope of delivery is complete and intact.
4.2.1 Scope of delivery
Number
1
1
1
1
1 Compression joint, gas G 1
1 Seal
1
1
Description
Hanging bracket
Heat generator
Condensate drain hose
Expansion relief valve
Condensate trap's cartridge installation kit
Enclosed documentation
4.3.3 Transporting the box from the delivery
point to the installation site – ground floor
▶ It is recommended that two people lift the unit together.
▶ Use safe lifting techniques – keep your back straight and
bend your legs at the knee.
8 Installation and maintenance instructions ecoTEC plus 0020214491_01
Installation 4
A
Ø 80/125
R 1
172
172
32
224 224
121
140
75
211
800
61
94
119
Ø 25, R1
G 1 1/
2
Rp 1 Rp 1
G 1 1/
2
R 3/
4
480
472
6
7
5
4
3
9
11
10
8
1
2
AB
4.4 Product dimensions and connection dimensions
1 Flue gas connection,
80/125 diameter
2 Hanging bracket
3 Gas pipe, 25 mm dia-
meter, gas connection
R1“
4 Expansion vessel con-
nection
5 Heating return connec-
tion
6 Heating flow connection
7 Expansion relief valve
connection
8 Condensate discharge
connection
9 Flow drain opening
10 Filling connection option
(combined filling and
emptying valve)
11 Condensate trap's
cartridge
Consult the installation template that is supplied to find the
dimension A.
4.5 Minimum clearances and installation clearances
A 500 mm B 400 mm
▶ When using the accessories, observe the minimum clear-
ances/installation clearances.
4.6 Clearance from combustible components
▶ It is not necessary to maintain a clearance between the
product and components made of combustible materials
that go beyond the minimum clearances.
4.7 Using the installation template
1. Position the installation template vertically over the in-
stallation site.
2. Secure the template to the wall.
3. Mark on the wall all the points required for the installa-
tion.
4. Remove the installation template from the wall.
5. Drill all the holes required.
6. Make any perforations necessary.
0020214491_01 ecoTEC plus Installation and maintenance instructions 9
5 Installation
1
2
4.8 Wall-mounting the product
1. Check whether the wall has sufficient load-bearing capacity to bear the operational weight of the product.
2. Check if the supplied fixing material may be used for
the wall.
Conditions: The load-bearing capacity of the wall is sufficient; the fixing
material is permitted for the wall
4.9 Removing or installing the front casing
4.9.1 Removing the front casing
1. Undo the bolt (1).
2. Push in both retaining clips (2) so that the front casing
is released.
3. Pull the front casing forwards at the bottom edge.
4. Lift the front casing upwards from the bracket.
▶ Wall-mount the product as described.
Conditions: The load-bearing capacity of the wall is not sufficient
▶ Ensure that wall-mounting apparatus on-site has a suf-
ficient load-bearing capacity. Use individual stands or
primary walling, for example.
▶ Do not wall-mount the product if you cannot provide
wall-mounting apparatus with a sufficient load-bearing
capacity.
Conditions: The fixing material may not be used for the wall
▶ Wall-mount the product as described using the permitted
fixing material provided on-site.
4.9.2 Installing the front casing
1. Place the front casing on the upper brackets.
2. Push the front casing onto the product until both retaining clips (2) snap into place at the front casing.
3. Secure the front casing by tightening the bolt (1).
5 Installation
Danger!
Risk of explosion or scalding caused by
incorrect installation.
Stresses in the connection cable can cause
leaks.
▶ Make sure there is no stress in the con-
nection cables when they are installed.
Caution.
Risk of material damage caused by
changes to the connected pipes.
▶ Only bend connection pipes if they have
not yet been connected to the product.
10 Installation and maintenance instructions ecoTEC plus 0020214491_01
Installation 5
1
2
3
4
1
2
3
4
Caution.
Risk of material damage caused by
residues in the pipelines.
Welding remnants, sealing residues, dirt or
other residues in the pipelines may damage
the product.
▶ Flush the heating installation thoroughly
before installing the product.
Seals made of rubber-like materials may be subject to plastic
deformation, which can lead to pressure losses. We recommend using seals made of a paste-like fibre material.
You must only start up the product if a sufficiently dimensioned low loss header has been installed between the heat
generation circuit and the heating circuit or cylinder charging
circuit.
5.1 Selecting a low loss header
The low loss header disconnects the heat generator from
the heating system. This means that the system is no longer
dependent on the heat generator's remaining feed head.
In conjunction with the heating pump, the low loss header
ensures that a sufficiently high minimum quantity of water is
always circulating through the heat generator.
Heating system output Heating system spread
10 K 15 K 20 K
Individual unit WH 160 WH 95 WH 95
Dual cascade WH 280 WH 160 WH 95
Three-unit cascade WH 280 WH 280 WH 160
5.1.1 Heating circuit connection with low loss header
1 Product with internal
pump
2 Low loss header
The product can directly operate a heating circuit via the low
loss header.
3 External heating pump
4 Consumer (e.g. heating
circuit)
▶ Downstream of the low loss header, select a heating
pump that is appropriate for the system.
▶ For multi-circuit systems, pay additional attention to the
control system accessories.
The settings for the internal pump are made at the factory.
▶ Connect the external heating pump to the grey ProE plug
X13.
▶ Set the diagnostics code D.26 to 2.
For old systems in particular, we recommend installing a
heating dirt filter in the return to the low loss header (not to
the product). This protects the product against dirt from the
system. Ensure that there is sufficient dimensioning in order
to prevent it from blocking quickly and to prevent high pressure losses.
You do not need any electrical accessories when using a
low loss header. You can connect simple systems directly
inside the electronics box; see the connection diagram
(→ Page 37).
5.1.2 Cylinder priority switching via low loss header
1 Product with internal
pump
2 Low loss header
The product's electronics are designed in such a way that
you can connect one cylinder charging circuit and one heating circuit directly without the need for accessories. The cylinder charging circuit connection downstream of the low loss
header means that you can select an individual cylinder size
and a cylinder charging pump.
3 External cylinder char-
ging pump
4 Consumer (e.g. cylinder
charging circuit)
0020214491_01 ecoTEC plus Installation and maintenance instructions 11
5 Installation
1
2
3
4
5
6
1
▶ Note that non-return valves or mixer circuits may be re-
quired in order to eliminate cross-flow to other circuits or
the effects of high temperatures from the cylinder charging circuit.
▶ Connect the cylinder charging pump to the ProE plug X6.
To start up the cylinder charging pump, it is not necessary to
set a diagnostics code. The slot on the PCB is reserved for
the cylinder charging pump.
5.1.3 Cylinder priority switching and heating circuit via low loss header
1 Product with internal
pump
2 Low loss header
3 External heating pump
The product's electronics are designed in such a way that
you can connect a standard system (one heating circuit and
one cylinder charging circuit) without the need for special accessories. If several circuits are required, special accessories and/or controllers are required. The product's remaining feed head for the low loss header is sufficient. You can
individually design the cylinder charging circuit connection
downstream of the low loss header (cylinder size, cylinder
charging pump size, etc.).
4 Consumer (e.g. heating
circuit)
5 External cylinder char-
ging pump
6 Cylinder
▶ Note that non-return valves or mixer circuits may be re-
quired in order to eliminate cross-flow to other circuits or
the effects of high temperatures from the cylinder charging circuit.
To start up the cylinder charging pump, it is not necessary to
set a diagnostics code. The slot on the PCB is reserved for
the cylinder charging pump.
The settings for the internal pump are made at the factory.
▶ Connect the cylinder charging pump to the ProE plug X6.
▶ Connect the external heating pump to the grey ProE plug
X13.
▶ Set the diagnostics code D.26 to 2.
5.2 Gas installation
5.2.1 Checking the gas meter
▶ Make sure that the existing gas meter is capable of
passing the rate of gas supply required.
5.2.2 Performing the gas installation
Caution.
Risk of material damage due to the gas
leak-tightness test.
At a test pressure of >11 kPa (110 mbar), gas
leak-tightness tests may cause damage to
the gas valve.
▶ If, during gas leak-tightness tests, you
also place the gas lines and the gas valve
in the product under pressure, use a max.
test pressure of 11 kPa (110 mbar).
▶ If you cannot limit the test pressure to
11 kPa (110 mbar), close any gas isolator
cocks that are installed upstream from the
product before you carry out the gas leaktightness test.
▶ If, during gas leak-tightness tests, you
have closed the gas isolator cock that is
installed upstream of the product, relieve
the gas line pressure before you open this
gas isolator cock.
Note
Do not reduce the gas pipe dimension downstream of the gas meter. Maintain the dimension
right up to the product. Select the correct gas isolator cock. When using an atmospheric sensing
device, select the next-highest pipe cross-section.
▶ Install the gas line without tension in accordance with the
recognised rules of technology.
▶ Make sure that the existing gas meter is capable of
passing the rate of gas supply required.
▶ Remove the residues from the gas pipe by blowing
through the gas pipe beforehand.
▶ Screw the gas pipe (1) to the (preinstalled) gas isolator
cock so that it is gas-tight. To do this, use the enclosed
compression joint G 1.
▶ Purge the gas pipe before start-up.
12 Installation and maintenance instructions ecoTEC plus 0020214491_01
Installation 5
21
1
1
2
5.2.3 Checking the gas line for leak-tightness
▶ Check the entire gas line properly for leak-tightness.
5.3 Hydraulics installation
Caution.
Risk of material damage caused by corro-
sion
Due to non-diffusion-tight plastic pipes in the
heating installation, air gets into the heating
water. Air in the heating water causes corrosion in the heat generator circuit and in the
product.
▶ If you use non-diffusion-tight plastic pipes
in the heating installation, ensure that no
air gets into the heat generator circuit.
Caution.
Risk of material damage due to heat trans-
fer during soldering.
Heat that is transferred during soldering may
cause damage to the seals in the service
valves.
▶ Do not solder the connection pieces if
the connection pieces are screwed to the
service valves.
5.3.2 Installing the expansion relief valve
1. Install the enclosed expansion relief valve.
2. Lay as short a drain line as possible for the expansion
relief valve, at a downward gradient.
3. Terminate the drain line in such a way that escaping
water or steam cannot cause injury to persons or damage to electronic components.
4. Make sure that the line end is visible.
5.3.3 Connecting the condensate drain pipework
5.3.4 Connecting the condensate drain pipework
▶ If you are using plastic pipes in the heating installation,
you must install a suitable limit thermostat on-site at the
heating flow. The limit thermostat is required to protect
the heating installation against temperature-related damage if a fault occurs.
▶ Install an expansion vessel on-site in the heating return,
as close to the product as possible.
5.3.1 Connecting the heating flow and heating return
1. Install service valves properly at the flow connection (1)
and the return connection (2).
2. Establish the heating connections in accordance with
the relevant standards.
Danger!
Risk of death from escaping flue gases!
The condensate drain pipework of the condensate trap must not be connected tightly to
waste-water piping because, otherwise, the
internal condensate trap may be drained fully
and flue gas may escape.
▶ Do not connect the condensate drain
pipework tightly to the waste-water piping.
Condensate forms in the product during combustion. The
condensate drain pipework (1) routes the condensate to the
waste water connection via a tundish (2).
0020214491_01 ecoTEC plus Installation and maintenance instructions 13
5 Installation
▶ Install the enclosed condensate drain pipework (hose)
(1).
Note
If the length of the enclosed hose is not sufficient, use only pipes that are made from
acid-resistant material (e.g. plastic) for the
condensate drain pipework and also for the
waste-water piping.
▶ Suspend the condensate drain pipework above the prein-
stalled tundish (2).
5.4 Installing the air/flue pipe
1. You can find out which flue pipes may be used by consulting the enclosed flue pipe installation manual.
Danger!
Risk of personal injury and material dam-
age due to unapproved air/flue pipes.
Vaillant boilers are certified only with Vaillant
original air/flue pipes. The use of other accessories may cause personal injury and material damage, as well as operating faults. For
installation type B23P, third-party accessories are also permitted (see the technical data
in the appendix).
▶ Only use Vaillant original air/flue pipes.
▶ If third-party accessories are permitted
for B23P, ensure that the flue pipe connections are properly routed, sealed and
secured against slipping out.
2. Install the flue pipe using the installation manual.
5.4.1 Information on installing the B23
A flue gas pipe in accordance with unit type B23 (open-flued
gas-fired wall-hung boilers) requires careful planning and implementation. During planning, observe the technical data for
the product and refer to the recognised rules of technology.
problem. The product must not be connected to a cascade
flue gas installation that is being used by other units.
▶ Observe the applicable international, national and local
regulations for flue gas systems, in particular for installations in living rooms. Inform the operator how to correctly
operate the product.
5.5 Installing and connecting the flue pipe
1. You can find out which flue pipes may be used by consulting the enclosed flue pipe installation manual.
2. Observe the information on positioning the opening
for the flue pipe. This information can be found in the
appendix.
Caution.
Risk of poisoning due to escaping flue
gas.
Mineral-oil-based greases can damage the
seals.
▶ Instead of grease, use only water or com-
mercially available soft soap to aid installation.
3. Install the flue pipe using the installation manual.
5.6 Electrical installation
Danger!
Risk of death from electric shock as a res-
ult of an improper electrical connection!
An improper electrical connection may negatively affect the operational safety of the
product and result in material damage or personal injury.
▶ Only carry out the electrical installation if
you are a trained competent person and
are qualified for this work.
▶ Observe all applicable laws, standards
and directives in the process.
▶ Earth the product.
5.4.2 Information and specifications for installing the B23P
The flue gas system must at least correspond to the classification T 120 P1 W 1 in accordance with EN 1443. The
maximum pipe length must be calculated based on the permissible pressure difference in the technical data.
The maximum pipe length (straight pipe only) corresponds to
the maximum permitted flue gas pipe length without any elbows. If elbows are used, the maximum pipe length must be
reduced in accordance with the dynamic flow characteristics
of the elbows. Elbows must not be connected directly after
one another as this method dramatically increases pressure
losses.
In particular, if the flue pipe is installed in cold rooms or outside of the building, the freezing point on the surface of the
inside of the pipe may be reached. A proven design in accordance with EN 13384-1 for a maximum boiler load at a
flue gas temperature of 40 °C must be used to prevent this
Danger!
Risk of death from electric shock!
Touching live connections may cause serious personal injury. Since mains connection
terminals L and N also remain live even if the
boiler main switch is turned off:
▶ Switch off the power supply.
▶ Secure the power supply against being
switched on again.
14 Installation and maintenance instructions ecoTEC plus 0020214491_01
Installation 5
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1
3
5.6.1 Opening or closing the electronics box
5.6.1.1 Opening the electronics box
1. Remove the front casing. (→ Page 10)
5.6.3 Carrying out the wiring
Caution.
Risk of material damage caused by incor-
rect installation.
Mains voltage at the incorrect plug terminals
on the ProE system may destroy the electronics.
▶ Do not connect any mains voltage to the
eBUS terminals (+/-).
▶ Only connect the power supply cable to
the terminals marked for the purpose.
1. Route the supply lines of the components to be connected through the cable duct provided on the underside of
the product on the left.
2. Use strain reliefs.
3. Shorten the supply lines as necessary.
4. Only strip the outer sheathing of flexible lines to a maximum of 30 mm to prevent short circuits if a strand accidentally comes loose.
5. Ensure the inner conductor insulation is not damaged
when stripping the outer sheathing.
6. Only strip inner conductors just enough to establish
2. Tilt the electronics box (3) forwards.
3. Detach the left and right clips (1) from the brackets.
4. Fold up the cover (2).
5.6.1.2 Closing the electronics box
1. Close the cover (2) by pushing it downwards onto the
electronics box (3).
2. Ensure that all of the clips (1) audibly click into the
brackets.
3. Tilt the electronics box upwards.
5.6.2 Establishing the power supply
1. Observe the relevant regulations and the enclosed connection diagram.
2. Provide one common electricity supply for the boiler
and for the corresponding controller:
– Power supply: Single-phase, 230 V, 50 Hz
– Fuse protection: ≤ 3 A
3. Connect the product using a fixed connection and a
partition with a contact opening of at least 3 mm (e.g.
fuses or power switches), see Connection diagram
(→ Page 37).
4. Use a flexible line for the mains connection line, which
is routed through the cable duct into the product.
5. Carry out the wiring. (→ Page 15)
6. Screw the ProE plug supplied to a suitable three-core
mains connection cable which complies with the relevant standards.
7. Close the electronics box. (→ Page 15)
8. Make sure that access to the power supply is always
available and is not covered or blocked.
good, sound connections.
7. To avoid short circuits resulting from loose individual
wires, fit conductor end sleeves on the stripped ends of
the conductors.
8. Screw the respective ProE plug to the supply line.
9. Check whether all conductors are sitting mechanically
securely in the terminals of the ProE plug. Remedy this
if necessary.
10. Plug the ProE plug into the associated PCB slot.
5.6.4 Installing the controller
▶ Install the controller if necessary.
5.6.5 Connecting controllers to the electronic
system
1. Carry out the wiring. (→ Page 15)
2. If you do not connect a room/timer thermostat, bridge
terminals 3 and 4, if no bridge exists.
3. If you connect a room/timer thermostat to terminals 3
and 4, remove the bridge.
4. If you connect a weather compensator or room thermostat (continuous control – connection terminals 7, 8, 9),
leave the bridge inserted between terminal 3 and 4.
5. If you connect a limit thermostat (contact thermostat)
for underfloor heating systems, remove the bridge on
the blue ProE plug (contact thermostat) and connect the
limit thermostat here.
6. Close the electronics box. (→ Page 15)
7. To access pump operating mode 1 (continuously running pump) for multi-circuit controllers, set D.18 Pump
operating mode (→ Page 23) from 3 (intermittent pump)
to 1.
0020214491_01 ecoTEC plus Installation and maintenance instructions 15
6 Start-up
5.6.6 Connecting a low loss header sensor
1. Connect the low loss header sensor to the edge connector X41 at terminal RF or to the controller. When doing so, observe the instructions for the controller.
2. Plug the edge connector into the PCB slot X41.
3. Activate the low loss header function at the controller.
5.6.7 Connecting a cylinder charging pump
▶ Connect an external cylinder charging pump (to be fitted
on-site) to the pink ProE plug X6.
5.6.8 Connecting additional components
You can actuate an additional component with the aid of the
auxiliary relay that is installed, and you can actuate two other
components with the multi-functional module.
The following components can be actuated:
1. Circulation pump
2. External pump
3. Cylinder charge pump
4. Extractor hood
5. External solenoid valve
6. External fault signal
7. Not active
8. eBUS remote control (not active)
9. Legionella protection pump (not active)
10. Not active.
5.6.8.1 Using the auxiliary relay
1. Connect an additional component directly to the integrated auxiliary relay using the grey plug on the PCB.
2. Carry out the wiring. (→ Page 15)
3. To start up the connected component, select the
component via D.26, see Calling up diagnostics codes
(→ Page 23).
5.6.8.2 Using the VR 40 ("2 in 7" multi-functional
module)
1. Install the components in accordance with the respective instructions.
2. Select D.27 (→ Page 23) to actuate relay 1 on the multifunctional module.
3. Select D.28 (→ Page 23) to actuate relay 2 on the multifunctional module.
5.6.9 Actuating the circulation pump according to requirements
Note
The product's electronics provide the opportunity
to control a domestic hot water cylinder's circulation pump as necessary (similar to an automatic
light unit for stairs). It is controlled using an external button (to be fitted on-site) that can be installed anywhere in the dwelling, e.g. in the bathroom or kitchen. When the button is pressed, the
circulation pump starts up. The pump is switched
on again after five minutes. Several buttons can
be pressed in parallel. Irrespective of the external
control of the circulation pump, the "Control by
programmable time periods" function continues to
be possible when a controller is used.
Conditions: Domestic hot water cylinder connected
▶ Carry out the wiring. (→ Page 15)
▶ Connect the supply line for an external button using ter-
minals 1 (0) and 6 (functional drawing) on the X41
edge connector, which is supplied with the controller.
▶ Plug the edge connector into the PCB slot X41.
6 Start-up
6.1 Carrying out the initial start-up
Initial start-up must be carried out by a customer service
technician or an authorised competent person using the
commissioning checklist. The commissioning checklist in the
appendix (→ Page 39) of the installation instructions must be
filled in and stored carefully along with the unit's documentation.
▶ Carry out the start-up procedure using the commissioning
checklist in the appendix.
▶ Fill in and sign the commissioning checklist.
6.2 Switching on the product
▶ Set the product's main switch to 1.
◁ The basic display appears on the display.
6.3 Using check programmes
By activating various check programmes, you can trigger
special functions on the product.
Display Meaning
P.0 Purging check programme:
The internal pump is cyclically actuated.
The heating circuit and the hot water circuit are
purged via the automatic air vent (the cap of the
automatic air vent must be released).
1 x : Start heating circuit purging (display view:
HP)
2 x : Start cylinder charging circuit purging
(display view: SP)
3 x : Exit purging programme
Note
The purging programme runs for 6.5 minutes per
circuit and then terminates.
16 Installation and maintenance instructions ecoTEC plus 0020214491_01
Start-up 6
Display Meaning
P.1 Maximum load check programme:
After successful ignition, the product is operated at
maximum heat input.
P.2 Minimum load check programme:
After successful ignition, the product is operated at
minimum heat input.
P.5 SCO (safety cut-out) check programme:
The burner is switched on and the control is
switched off so that the product heats up until it
reaches the safety cut-out's switch-off temperature of
97 °C while avoiding a regular shutdown.
P.6 Check programme, diverter valve mid-position: (not
You can start check programmes P.0 to P.6 by either:
– Switching on the main switch and, at the same time,
pressing and holding for five seconds or
–
Pressing and holding and at the same time, releasing and pressing and holding for five seconds
The displays shows P. 0.
▶
Press to move up the check programmes in numerical
order.
▶
Press to start the check programme.
▶
Press and at the same time to exit the check programmes. You can also exit the check programmes by
not pressing any button for 15 minutes.
active)
6.4 Checking and treating the heating water/filling and supplementary water
Caution.
Risk of material damage due to poor-qual-
ity heating water
▶ Ensure that the heating water is of suffi-
cient quality.
Treating the filling and supplementary water
▶ Observe all applicable national regulations and technical
standards when treating the filling and supplementary
water.
Provided the national regulations and technical standards
do not stipulate more stringent requirements, the following
applies:
You must treat the heating water in the following cases:
– If the entire filling and supplementary water quantity dur-
ing the operating life of the system exceeds three times
the nominal volume of the heating installation, or
– If the guideline values listed in the following table are not
met, or
– If the pH value of the heating water is less than 8.2 or
more than 10.0.
Total
heating
output
kW
< 50 < 300 < 3 200 2 2 0.02
> 50
to ≤ 200
> 200
to ≤ 600
> 600 2 0.02 2 0.02 2 0.02
1) Nominal capacity in litres/heating output; in the case of multiboiler systems, the smallest single heating output is to be used.
Water hardness at specific system volume
≤ 20 l/kW
ppm
CaCO₃
200 2 150 1.5 2 0.02
150 1.5 2 0.02 2 0.02
mol/m³ppm
> 20 l/kW
≤ 50 l/kW
CaCO₃
> 50 l/kW
mol/m³ppm
CaCO₃
Caution.
Risk of material damage if the heating
water is treated with unsuitable additives.
Unsuitable additives may cause changes in
the components, noises in heating mode and
possibly subsequent damage.
1)
mol/
m³
▶ Before filling or topping up the system, check the quality
of the heating water.
Checking the quality of the heating water
▶ Remove a little water from the heating circuit.
▶ Check the appearance of the heating water.
▶ If you ascertain that it contains sedimentary materials,
you must desludge the system.
▶ Use a magnetic rod to check whether it contains mag-
netite (iron oxide).
▶ If you ascertain that it contains magnetite, clean the sys-
tem and apply suitable corrosion-protection measures, or
fit a magnet filter.
▶ Check the pH value of the removed water at 25 °C.
▶ If the value is below 8.2 or above 10.0, clean the system
and treat the heating water.
▶ Ensure that oxygen cannot get into the heating water.
Checking the filling and supplementary water
▶ Before filling the system, measure the hardness of the
filling and supplementary water.
▶ Do not use any unsuitable frost and cor-
rosion protection agents, biocides or sealants.
No incompatibility with our products has been detected to
date with proper use of the following additives.
▶ When using additives, follow the manufacturer's instruc-
tions without exception.
We accept no liability for the compatibility of any additive or
its effectiveness in the rest of the heating system.
Additives for cleaning measures (subsequent
flushing required)
– Adey MC3+
– Adey MC5
– Fernox F3
– Sentinel X 300
– Sentinel X 400
Additives intended to remain permanently in the
system
– Adey MC1+
– Fernox F1
0020214491_01 ecoTEC plus Installation and maintenance instructions 17
6 Start-up
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1
– Fernox F2
– Sentinel X 100
– Sentinel X 200
Additives for frost protection intended to remain
permanently in the system
– Adey MC ZERO
– Fernox Antifreeze Alphi 11
– Sentinel X 500
▶ If you have used the above-mentioned additives, inform
the operator about the measures that are required.
▶ Inform the operator about the measures required for frost
protection.
6.5 Reading off the filling pressure
6.7 Preventing low water pressure
To prevent damage to the heating installation that is caused
by low filling pressure, the product is fitted with a water
pressure sensor. If the filling pressure falls below 0.06 MPa
(0.6 bar), the product indicates low pressure by displaying a
flashing pressure value. If the filling pressure falls below 0.03
MPa (0.3 bar), the product switches off. The display shows
F.22.
▶ Top up the heating water to start the product up again.
The pressure value flashes on the display until a pressure of
0.11 MPa (1.1 bar) or higher has been reached.
▶ If you notice frequent losses in pressure, determine and
eliminate the cause.
6.8 Filling and purging the heating installation
1. Flush the heating installation thoroughly before filling it.
2. Undo the cap of the automatic air vent (1) by one to two
rotations and leave it open, as the product purges itself
The product has an analogue pressure gauge (1) and a digital pressure display.
▶
To read off the digital value, press (2).
If the heating installation is full, the indicator on the pressure
gauge must point to the upper half of the grey area when the
heating installation is cold in order to ensure that it operates
smoothly. This corresponds to a filling pressure of between
0.1 MPa and 0.2 MPa (1.0 bar and 2.0 bar).
If the heating installation extends over several storeys,
higher filling pressures may be required to avoid air entering
the heating installation.
6.6 Reading off the filling pressure
The product comes with a digital pressure indicator.
▶ To read off the digital value for the filling pressure, press
the button briefly.
◁ The display will show the filling pressure for approx-
imately 5 seconds.
If the heating installation is full, the filling pressure must be
between 0.1 MPa and 0.2 MPa (1.0 bar and 2.0 bar) to ensure it operates properly.
If the heating installation extends over several storeys,
higher filling pressures may be required to avoid air entering
the heating installation.
via the automatic air vent even in continuous mode.
3. Observe the information on the topic of treating
(→ Page 17) heating water.
4. Connect the filling and drainage tap in the heating installation to a heating water supply in accordance with
the relevant standards.
5. Open the heating water supply.
6. Open all thermostatic radiator valves.
7. If necessary, check that both service valves on the
product are open.
8. Slowly open the filling and drainage tap so that the water flows into the heating installation.
9. Purge the lowest radiator until water flows out of the
purging valve without bubbles.
10. Purge all other radiators until the heating installation is
completely filled with water.
11. Close all purging valves.
12. Monitor the rising filling pressure in the heating installa-
tion.
13. Fill with water until the required filling pressure is
reached.
14. Close the filling and drainage tap and the heating water
supply.
15. Check all connections and the entire system for leaks.
16. To purge the heating installation, select the check pro-
gramme P.0.
◁ The product does not start up, the internal pump
operates intermittently and purges either the heating
18 Installation and maintenance instructions ecoTEC plus 0020214491_01
Start-up 6
1
circuit or the hot water circuit. The display shows
the filling pressure of the heating installation.
17. To be able to carry out the purging process properly,
the heating installation filling pressure must not fall below the minimum filling pressure.
– Minimum heating installation filling pressure:
0.08 MPa (0.80 bar)
Note
The check programme P.0 runs for
6.5 minutes per circuit.
At the end of the filling procedure, the
filling pressure of the heating installation
should be at least 0.02 MPa (0.2 bar) above
the counter-pressure of the expansion
vessel ("Exp") (P
(0.2 bar)).
18. If there is still too much air in the heating installation at
the end of the check programme P.0, repeat the check
programme.
19. Check all connections for leaks.
Installation
≥ P
+ 0.02 MPa
Exp
6.9 Flushing the heating installation for the first
time ("cold")
6.11 Filling the condensate trap
Danger!
Risk of poisoning due to escaping flue
gas.
An empty or insufficiently filled condensate
trap may allow flue gas to escape into the
room air.
▶ Fill the condensate trap with water before
starting up the product.
Note
The complete heating system must be flushed
at least twice: Once with cold water and once
with hot water in accordance with the following
instructions.
1. Check whether all thermostatic radiator valves and both
service valves on the product are open.
2. Connect a hose to the drain valve that is located at the
lowest position in the heating system.
3. Open the radiator valves and the drain valves so that
the water can drain quickly. Start at the next point in the
system and open the purging valves on the radiators so
that the contaminated water can completely drain.
4. Close the drain cocks.
5. Refill the heating system with water.
6. Check that the expansion relief valve of the heating
system is functioning correctly by turning the handle
on the valve.
7. Check the pressure in the heating system and top up
with water if necessary.
8. Close the filling valve and the cold water valve.
6.10 Filling the condensate siphon
1. Install the condensate trap's cartridge (1) in accordance
with the enclosed installation manual.
2. Fill the condensate trap in accordance with the enclosed description.
6.12 Gas ratio setting
6.12.1 Checking the factory setting
Caution.
An incorrect gas group setting may cause
operating faults or a reduction in the
working life of the product.
If the product design does not match the local
gas group, malfunctions will occur or you will
have to replace product components prematurely.
▶ Before you start up the product, compare
the gas group information on the identification plate with the gas group available at
the installation site.
Danger!
Risk of poisoning due to escaping flue
gas.
An empty or insufficiently filled condensate
siphon may allow flue gas to escape into the
room air.
▶ Fill the condensate siphon with water be-
The product's combustion has been factory tested and is
preset for operation with the gas group indicated on the identification plate. In some supply areas, these settings may
need to be adjusted at the installation site.
Conditions: The product design is not compatible with the local gas
group
▶ Do not start up the product.
fore starting up the product.
0020214491_01 ecoTEC plus Installation and maintenance instructions 19
6 Start-up
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2
Conditions: The product design is compatible with the local gas group
▶ Proceed as described below.
6.12.2 Checking the leak-tightness of the flue gas installation and flue gas recirculation
1. Check the flue gas installation is intact in accordance
with the latest gas safe technical bulletin and information supplied in the installation instructions.
2. For extended flue gas installations check for flue gas
recirculation using the air analysis point.
3. Use a flue gas analyser.
4. If you discover CO or CO2in the supply air, search for
the leak in the flue gas installation or for signs of flue
gas recirculation.
5. Eliminate the damage properly.
6. Check again whether the supply air contains any CO or
CO2.
7. If you cannot eliminate the damage, do not start up the
product.
6.12.4 Checking the gas flow pressure
1. Ensure that the gas inlet working pressure can be
obtained with all other gas appliances in the property
working.
2. Close the gas isolator cock.
6.12.3 Checking the gas flow rate
The boiler is fitted with a multifunctional automatic gas valve
which ensures that the precise air/gas ratio is provided under
all operating conditions.
The gas flow rate has been set during production and does
not require adjustment. With the front casing fitted check the
gas flow rate of the boiler as follows:
▶ Start up the product with the check programme P.01.
▶ In addition, ensure that maximum heat can be dissipated
into the heating system by turning up the room thermostat.
▶ Wait at least 5 minutes until the boiler has reached its
operating temperature.
▶ Ensure that all other gas appliances in the property are
turned off.
▶ Measure the gas flow rate at the gas meter.
▶ Compare the measured values with the corresponding
values in the table.
Qnw from the data
plate
46,0 4,87 5.13 4,38
65,0 6,88 7,24 6,19
H gas in m³/h
Nom. +5 % −10 %
3. Undo the sealing screw (1) that is marked with in on the
gas valve.
4. Connect a digital pressure gauge or U-tube manometer
(2).
5. Open the gas isolator cock.
6. Start up the product with the check programme P.1.
7. In addition, ensure that maximum heat can be dissipated into the heating system by turning up the room
thermostat.
8. With the boiler operating at full load check that the gas
inlet working pressure at the reference test point (1)
complies with the requirements.
– Permissible gas flow pressure for operation with
G20 natural gas: 1.6 … 2.3 kPa (16.0 … 23.0 mbar)
9. Should the pressure recorded at the reference test point
in the boiler be lower than indicated check if there is
any blockage in the pipework or if the pipework is undersized.
Conditions: Gas flow pressure not in the permissible range
Caution.
Risk of material damage and operating
faults caused by incorrect gas flow pres-
Conditions: Gas flow rate not in the permissible range
▶ Check all of the piping and ensure that the gas flow rates
are correct.
▶ Only put the product into operation once the gas flow
rates have been corrected.
Conditions: Gas flow rate in the permissible range
▶ End the check programme P.01.
sure.
If the gas flow pressure lies outside the permissible range, this can cause operating
faults in and damage to the product.
▶ Do not make any adjustments to the
product.
▶ Check the gas installation.
▶ Do not start up the product.
▶ Allow the boiler to cool down by allowing pump overrun to
operate for a minimum of 2 minutes.
▶ Record the boiler maximum gas flow rate onto the
Benchmark gas boiler commissioning checklist.
▶ If you cannot correct the failure, notify the gas supply
company and proceed as follows:
▶ End the check programme P.01.
▶ Allow the boiler to cool down by allowing pump overrun
to operate for a minimum of two minutes.
▶ Close the gas isolator cock.
20 Installation and maintenance instructions ecoTEC plus 0020214491_01
Start-up 6
1
2
3
4
1
2
3
4
▶ Remove the pressure gauge and retighten the sealing
screw (1) for the measuring nipple.
▶ Open the gas isolator cock.
▶ Check the measuring nipple for gas tightness.
▶ Close the gas isolator cock.
▶ Install the front casing. (→ Page 10)
▶ Disconnect the product from the power mains.
▶ You must not start up the boiler.
Conditions: Gas flow pressure in the permissible range
▶ End the check programme P.01.
▶ Allow the boiler to cool down allowing pump overrun to
operate for a minimum of two minutes.
▶ Close the gas isolator cock.
▶ Remove the pressure gauge and retighten the sealing
screw (1) for the measuring nipple.
▶ Open the gas isolator cock.
▶ Check the measuring nipple for gas tightness.
▶ Install the front casing. (→ Page 10)
▶ Reset boiler controls for normal operation.
▶ Record the appliance gas inlet working pressure (kPa
resp. mbar) in the Benchmark gas boiler commissioning
checklist.
6.12.5 Checking the CO₂ content and, if
necessary, adjusting it (air index setting)
1. Start up the product with the check programme P.1.
2. Wait at least five minutes until the product reaches its
operating temperature.
Conditions: The CO₂ content must be adjusted
▶ Unscrew the screw (2) and tilt the air intake pipe (3) for-
wards by 90°. Do not remove the air intake pipe.
▶ Set the CO₂ content (value with front casing removed)
by turning the screw (4).
Note
Turn to the left: Higher CO₂ content
Turn to the right: Lower CO₂ content
▶ Only carry out the adjustment in increments of 1/8 turn
and wait approximately 1 minute after each adjustment
until the value stabilises.
▶ After performing the adjustments, tilt the air intake pipe
back up.
▶ Check the CO₂ content again.
▶ If necessary, repeat the setting process.
▶
Press the button. Full load mode is also exited if no
buttons are pressed for 15 minutes.
▶ Use the screw (2) to secure the air intake pipe again.
▶ If an adjustment is not possible in the specified adjust-
ment range, you must not start up the product.
▶ If this is the case, inform Vaillant Customer Service.
▶ Install the front casing. (→ Page 10)
6.12.6 Checking the CO₂ content and, if
necessary, adjusting it (air index setting)
1. Start up the product with the check programme P.1.
2. Wait at least five minutes until the product reaches its
operating temperature.
3. Measure the CO₂ content at the flue gas analysis point
(1).
4. Compare the measured value with the corresponding
value in the table.
Settings Unit G20 natural
CO₂ after 5 minutes in full load
mode with front casing closed
CO₂ after 5 minutes in full load
mode with front casing removed
Set for Wobbe index W₀ kWh/m³ 14.1
O₂ after 5 minutes in full load
mode with front casing closed
0020214491_01 ecoTEC plus Installation and maintenance instructions 21
Vol.–% 9.2 ± 1.0
Vol.–% 9.0 ± 1.0
Vol.–% 4.53 ± 1.8
gas
3. Measure the CO₂ content at the flue gas analysis point
(1).
4. Compare the measured value with the corresponding
value in the table.
Settings Unit G20 natural
CO₂ after 5 minutes in full load
mode with front casing closed
CO₂ after 5 minutes in full load
mode with front casing removed
Set for Wobbe index W₀ kWh/m³ 14.1
Vol.–% 9.2 ± 1.0
Vol.–% 9.0 ± 1.0
gas
6 Start-up
Settings Unit G20 natural
O₂ after 5 minutes in full load
mode with front casing closed
Conditions: The CO₂ content must be adjusted
Vol.–% 4.53 ± 1.8
gas
▶ Unscrew the screw (2) and tilt the air intake pipe (3) for-
wards by 90°. Do not remove the air intake pipe.
▶ Set the CO₂ content (value with front casing removed)
by turning the screw (4).
Note
Turn to the left: Higher CO₂ content
Turn to the right: Lower CO₂ content
▶ Only carry out the adjustment in increments of 1/8 turn
and wait approximately 1 minute after each adjustment
until the value stabilises.
▶ After performing the adjustments, tilt the air intake pipe
back up.
▶ Check the CO₂ content again.
▶ If necessary, repeat the setting process.
▶
Press the button. Full load mode is also exited if no
buttons are pressed for 15 minutes.
▶ Use the screw (2) to secure the air intake pipe again.
▶ If an adjustment is not possible in the specified adjust-
ment range, you must not start up the product.
▶ If this is the case, inform Vaillant Customer Service.
▶ Install the front casing. (→ Page 10)
6.13 Checking leak-tightness
▶ Check the gas pipe, the heating circuit and the hot water
circuit for leak-tightness.
▶ Check that the flue gas pipe has been installed correctly.
6.13.1 Checking the heating mode
1. Make sure that there is a heat requirement.
2.
Press to activate the status display.
◁ If the product is working correctly, the display shows
S.4.
6.13.2 Checking the hot water generation
Conditions: Cylinder connected
Danger!
Risk of death from Legionella.
Legionella multiply at temperatures below
60 °C.
▶ Ensure that the operator is familiar with
all of the Anti-legionella measures in order to comply with the applicable regulations regarding legionella prevention.
◁ If the cylinder is charged correctly, the display
shows S.24.
2. If you have connected a controller which can be used to
set the hot water temperature, set the hot water temperature on the boiler to the maximum possible temperature.
Conditions: Water hardness: > 3.57 mol/m³, Boiler with cylinder
– Water temperature: ≤ 50 ℃
3. Adjust the target temperature for the connected domestic hot water cylinder to the controller.
◁ The boiler adopts the set target temperature which
is set on the controller (automatic calibration in
newer controllers).
6.14 Thoroughly flushing the heating installation
("hot")
1. Operate the appliance until the boiler and the heating
system are up to temperature.
2. Check the heating system for leaks.
3. Connect a hose to the drain valve located at the lowest
position of the heating system.
4. Shut off the boiler, open the drain valve and all purge
valves on the radiators and allow the water to flow out
of the heating system and the boiler quickly and fully.
5. Close the drain valve.
6. Fill the heating system again with water as described in "Filling and purging the heating installation"
(→ Page 18).
7. Re-fill the system until the system design pressure of
0,1 MPa (1,0 bar) is attained.
Note
The actual reading on the digital pressure
gauge should ideally be 0,05 MPa (0,5 bar)
plus an additional pressure corresponding
to the highest point of the system above the
base of the boiler – 10 m head equals an additional 1 bar reading on the pressure gauge.
The minimum pressure should not be less
than 0,1 MPa (1 bar) in any installation. If
the system is to be treated with an inhibitor it
should be applied at this stage in accordance
with the manufacturer’s instructions. Further
information can be obtained from Sentinel,
Betz Dearborn Ltd., Tel: 0151 420 9595, or
Fernox, Alpha– Fry technologies. Tel: 0870
8700362.
8. Install the front casing. (→ Page 10)
▶ Make sure that the cylinder thermostat is requesting
heat.
1.
Press to activate the status display.
22 Installation and maintenance instructions ecoTEC plus 0020214491_01
Adapting the unit to the heating installation 7
+
+
7 Adapting the unit to the heating
installation
7.1 Calling up diagnostics codes
You can use the parameters that are marked as adjustable
in the overview of diagnostics codes to adapt the product to
the heating installation and the needs of the customer.
Overview of diagnostics codes (→ Page 31)
▶
Press and below the display at the same time.
◁ The display shows D.0 (heating partial load).
▶
Exit Diagnostics mode by pressing and at the
same time or by not pressing any button for four minutes.
◁ The current heating flow temperature appears in the
display.
Note
If you activate the installer level (second diagnostics level), all of the diagnostics codes are
visible and accessible.
7.2 Calling up the installer level (second diagnostics level)
▶
Press .
◁ The display shows the associated diagnostics inform-
ation.
▶
If required, use or to change the value (the display
flashes).
▶
Save the new value by pressing and holding for approx. five seconds until the display no longer flashes.
▶ In the first diagnostics level, scroll to D.97.
▶ Change the displayed value to 17 (password).
▶ Save the setting.
7.3 Setting the heating partial load
The product's heating partial load is set to 46 kW at the factory. You can specify a value that corresponds to the product
output in kW under diagnostics code D. 0.
7.4 Setting the pump overrun and pump operating mode
You can set the pump overrun under D.1 (default setting: 5
min.).
You can set the overrun behaviour of the pump to a different
mode under D.18.
Overrun: After ending the heating demand, the pump overruns the time that is set under D.1.
Continuous: The pump is switched on if the rotary knob for
setting the heating flow temperature is not at the left-hand
stop and the heat requirement is enabled by an external controller.
Intermittent: This pump operating mode is useful for removing residual heat after charging when the heat demand is extremely low and large temperature differences exist between
the cylinder charging and heating mode target values. This
prevents the living rooms from overheating. If there is a heat
demand, the pump is switched on every 25 minutes for 5
minutes once the overrun time has elapsed.
0020214491_01 ecoTEC plus Installation and maintenance instructions 23
7 Adapting the unit to the heating installation
500
250 750
1000
1250
1500
1750
2000
2250
2500
2750
3000
3250
35000
0
100
200
300
400
500
600
800
1000
700
900
1100
1200
B
A
53%
100%
7.5 Setting the maximum flow temperature
You can set the maximum flow temperature for the heating
mode under D.71 (default setting: 75 °C).
7.6 Setting the burner anti-cycling time
To prevent frequent switching on and off of the burner and
thus prevent energy losses, an electronic restart lockout
is activated for a specific period each time the burner is
switched off. You can adjust the burner anti-cycling time to
the conditions of the heating installation. The burner anticycling time is only active for the heating mode. Hot water
handling mode during a burner anti-cycling time does not
affect the time function element. You can set the maximum
burner anti-cycling time under D.2 (default setting: 20 min.).
The effective burner anti-cycling times with respect to the
target flow temperature and the maximum set burner anticycling time can be found in the following table:
T
Flow
(target)
[°C]
30 2.0 4.0 8.5 12.5 16.5 20.5 25.0
35 2.0 4.0 7.5 11.0 15.0 18.5 22.0
40 2.0 3.5 6.5 10.0 13.0 16.5 19.5
45 2.0 3.0 6.0 8.5 11.5 14.0 17.0
50 2.0 3.0 5.0 7.5 9.5 12.0 14.0
55 2.0 2.5 4.5 6.0 8.0 10.0 11.5
60 2.0 2.0 3.5 5.0 6.0 7.5 9.0
65 2.0 1.5 2.5 3.5 4.5 5.5 6.5
70 2.0 1.5 2.0 2.5 2.5 3.0 3.5
75 2.0 1.0 1.0 1.0 1.0 1.0 1.0
Set maximum burner anti-cycling time [min]
1 5 10 15 20 25 30
7.7 Setting the maintenance interval
If you set the maintenance interval, the maintenance message SEr appears in the display after a configurable number
of burner operating hours. The display on the eBUS controller shows the information Maintenance.
▶ Use D.84 to set the operating hours until the next main-
tenance work is due. Guideline values can be found in
the following table.
Heat demand
5.0 kW
10.0 kW
15.0 kW
20.0 kW
25.0 kW
> 27.0 kW
Number
of persons
1 ‑ 2 1050 h
2 ‑ 3 1150 h
1 ‑ 2 1500 h
2 ‑ 3 1600 h
2 ‑ 3 1800 h
3 ‑ 4 1900 h
3 ‑ 4 2600 h
4 ‑ 5 2700 h
3 ‑ 4 2800 h
4 ‑ 6 2900 h
3 ‑ 4 3000 h
4 ‑ 6 3000 h
The values stated correspond to an average operating time
of one year.
If you do not set a numerical value but do set the symbol "–",
the Maintenance display function is not active.
Burner operating hours until the
next inspection/maintenance work
is due (dependent upon the system type)
T
Flow
(target)
[°C]
30 29.0 33.0 37.0 41.0 45.0 49.5
35 25.5 29.5 33.0 36.5 40.5 44.0
40 22.5 26.0 29.0 32.0 35.5 38.5
45 19.5 22.5 25.0 27.5 30.5 33.0
50 16.5 18.5 21.0 23.5 25.5 28.0
55 13.5 15.0 17.0 19.0 20.5 22.5
60 10.5 11.5 13.0 14.5 15.5 17.0
65 7.0 8.0 9.0 10.0 11.0 11.5
70 4.0 4.5 5.0 5.5 6.0 6.5
75 1.0 1.0 1.0 1.0 1.0 1.0
Set maximum burner anti-cycling time [min]
35 40 45 50 55 60
7.8 Pump diagram
Note
On completion of the set operating hours, you
must set the maintenance interval again.
Note
The remaining burner anti-cycling time following a
regular shutdown in heating mode can be called
up under D.67.
A Pump remaining feed
head in hPa (mbar)
B System volume flow in
l/h
Min. vortex and rated volume flow (ΔT 20 K) are marked.
24 Installation and maintenance instructions ecoTEC plus 0020214491_01
Inspection and maintenance 8
7.9 Adjusting the product to large flue gas pipe lengths
At flue gas pipe lengths greater than 10 m (system 80/125),
you can increase the product's fan speed.
▶ Increase the value by 20 under D.51.
◁ The maximum speed of the fan is increased by
200 rpm.
7.10 Handing the product over to the operator
1. When you have finished the installation, attach the
sticker supplied (835593) to the front of the product in
the operator's language.
2. Explain to the operator how the safety devices work and
where they are located.
3. Inform the operator how to handle the product. Answer
any questions the operator may have. In particular,
draw attention to the safety information which the operator must follow.
4. Inform the operator of the necessity to have the product
maintained according to the specified intervals.
5. Pass all of the instructions and documentation for the
product to the operator for safe-keeping.
6. Inform the operator about measures taken to ensure the
supply of combustion air and flue gas guiding, and instruct the operator that he must not make any changes.
Warning.
Risk of injury and death due to improper
inspection and maintenance!
Improper performance of inspections and
maintenance work may result in leaks or
even an explosion.
▶ Inspection and maintenance work on the
product must only be carried out by professionally qualified persons.
Any customer service work must be carried out by a professionally qualified person in accordance with the safety, installation and operating provisions for gas-fired units. Professional qualification must be confirmed by an adequately
recognised organisation or public office.
Note
The person who carries out a combustion measurement must be trained in the use of a flue gas
measuring instrument and in interpreting the results. The flue gas measuring instrument that is
used must be calibrated in accordance with the
specifications of the measuring instrument manufacturer. The correct fuel type must be set on the
flue gas measuring instrument.
8 Inspection and maintenance
▶ Carry out all inspection and maintenance work in the
order shown in the table "Overview of inspection and
maintenance work".
8.1 Observing inspection and maintenance intervals
Warning.
Risk of injury and a risk of material dam-
age caused by negligent inspection and
maintenance work.
Negligence in inspection and maintenance
work, as well as failure to comply with the
specified inspection and maintenance intervals, may impair the operational safety of
the product and lead to injuries and material
damage.
▶ Instruct the operator that the prescribed
inspection and maintenance intervals
must be complied with as a minimum requirement.
▶ Carry out a regular inspection once a
year.
▶ Carry out regular maintenance work in line
with the findings from the inspection. The
maintenance interval must not be longer
than two years.
Maintenance
Maintenance is required in order to eliminate any deviations
of the actual condition from the target condition. This is normally done by cleaning, setting and, if necessary, replacing
individual components that are subject to wear.
As the competent person, you determine the maintenance
intervals (at least once every two years) and their scope
based on the how you define the condition of the product
during the inspection. Carry out all inspection and maintenance work in the sequence shown in Appendix C.
Proper, regular inspection and maintenance, and the
exclusive use of original spare parts are absolutely essential
to ensure fault-free operation and a long working life for the
product.
Inspection
The inspection is intended to determine the actual condition
of the product and compare it with the target condition. This
is done by measuring, checking and observing.
Maintenance
Maintenance is required in order to eliminate any deviations
of the actual condition from the target condition. This usually
involves cleaning, adjusting and, if required, replacing individual components that are prone to wear (e.g. the burner
flange seal (article number 180904), the burner insulation on
the burner flange (article number 180913) and the burner insulation on the back wall of the heat exchanger (article number 0020093190)).
0020214491_01 ecoTEC plus Installation and maintenance instructions 25
8 Inspection and maintenance
1
2
3
4
5
6
7
8910
8.2 Procuring spare parts
The original components of the product were also certified
by the manufacturer as part of the declaration of conformity.
If you use other, non-certified or unauthorised parts during
maintenance or repair work, this may void the conformity of
the product and it will therefore no longer comply with the
applicable standards.
We strongly recommend that you use original spare parts
from the manufacturer as this guarantees fault-free and safe
operation of the product. To receive information about the
available original spare parts, contact the contact address
provided on the reverse of these instructions.
▶ If you require spare parts for maintenance or repair
work, use only the spare parts that are permitted for the
product.
8.3 Removing the compact thermal module
Danger!
Risk of death and risk of material damage
caused by hot flue gas.
The seal, burner insulation and self-locking
nuts on the burner flange must not be damaged. Otherwise, hot flue gases may escape
and cause personal injury and material damage.
▶ Replace the seal each time you open the
burner flange.
▶ Replace the self-locking nuts on the
burner flange each time you open the
burner flange.
▶ If the burner insulation on the heat ex-
changer's burner flange shows signs of
damage, replace the burner insulation.
▶ Replace the burner insulation on the back
wall after each time the burner flange is
opened.
Note
The compact thermal module consists of four
main components:
– Speed-regulated fan,
– Gas-air mixture fitting,
– Gas supply (mixture pipe) to the premix burner,
– Premix burner.
1. Use the main switch to switch off the product.
2. Close the gas isolator cock.
3. Remove the front casing. (→ Page 10)
4. Tilt the electronics box forward.
5. Unscrew the retaining screw (3).
6. Tilt the air intake pipe (2) forwards.
7. Remove the air intake pipe from the intake manifold.
8. Remove the ignition line and ground connection plugs
from the ignition electrode (5).
9. Disconnect the gas line (9) from the underside of the
gas valve.
10. Pull out the cable (7) from the fan motor, the PWM
signal cable from the underside of the fan (8) and the
cable to the gas valve (10).
11. Unscrew the six nuts (4).
12. Remove the entire compact thermal module (6) from
the heat exchanger (1).
13. Check the burner and the heat exchanger for damage
and dirt.
14. If necessary, clean or replace the components accord-
ing to the following sections.
15. Replace the burner insulation on the back wall of the
heat exchanger.
16. Check the burner insulation on the burner flange. If
you notice any signs of damage, replace the burner
insulation.
8.4 Cleaning the heat exchanger
1. Protect the folded down electronics box against sprayed
water.
26 Installation and maintenance instructions ecoTEC plus 0020214491_01
1
2
2. Use vinegar (max. 5% acid) to clean the heating coils
1
2
3
1 2
2
1
(2) on the heat exchanger (1).
3. After a reaction time of 20 minutes, use a sharp jet of
water or a plastic brush to rinse the loosened dirt. Do
not point the water jet directly at the burner insulation
on the back of the heat exchanger.
◁ The water flows out of the heat exchanger through
the condensate trap.
Inspection and maintenance 8
8.6 Checking the burner
1. Check the surface of the burner for damage. If you see
any damage, replace the burner.
2. Replace the silicone seal (1) and the silicate cord (2).
3. Check the burner insulation (3) on the burner flange
and, if required, replace the burner insulation.
8.7 Cleaning the condensate duct
8.5 Descaling the heat exchanger
1. Drain the product. (→ Page 28)
2. Remove the automatic air vent from the air separator.
3. Fill the product with descaler (ET 990098) via the open
connection on the automatic air vent.
4. Fill the product with clean water up to the nominal pressure.
5. Set the pump to "Continuous".
6. Use the chimney sweep button to heat up the product.
7. Leave the descaler to work in maximum output operation for approx. 30 minutes.
8. Then thoroughly rinse out the product with clean water.
9. Set the pump back to its starting condition.
10. Open the service valves and, if required, fill the heating
installation.
1. Observe the installation manual for the condensate
trap's cartridge.
2. Remove the condensate trap's cartridge from below the
product.
3. Pull out the clamp from below the heat exchanger.
4. Remove the elbow connector.
5. Remove the condensate trap (2) and the corrugated
pipe (1). In doing so, note the position of the latching
lugs.
6. Clean the condensate trap, the corrugated pipe and the
condensate trap's cartridge.
7. Fill the condensate trap's cartridge with water.
8. Install the components with new seals and six new, selflocking nuts.
0020214491_01 ecoTEC plus Installation and maintenance instructions 27
8 Inspection and maintenance
1
2
3
1
4
2
3
1
2
3
4
5
6
7
8910
– Tightening torque: 6 Nm
8.8 Cleaning the air separation system
8.8.1 Cleaning or replacing the filter in the air separator
1. Unscrew the brass cover (1) on the steel casing (3).
2. Pull the filter (2) up and out.
3. Use hot water to clean the filter, or replace the filter.
4. Insert the filter into the air separator.
5. Screw in the brass cover tightly.
8.9 Installing the compact thermal module
8.8.2 Cleaning the air separator
1. Unscrew the nut (4).
2. Unscrew the cap nut (1).
3. Remove the cable harness.
4. Slide the casing (3) forwards and pull the entire air sep-
arator forwards and out.
5. If required, remove the pipe (2).
6. Remove the filter.
7. Use hot water to clean the air separator and the filter.
8. Replace all of the O-rings.
9. Reinstall the air separator.
1. Connect the compact thermal module (6) to the heat
exchanger (1).
2. Tighten the six nuts (4), including the retainer for the
air intake pipe, in a cross-wise pattern until the burner
flange fits closely and uniformly onto the mating surfaces.
3. Check that the blue sealing ring in the air intake pipe is
positioned correctly in the seal seat.
4. Place the air intake pipe (2) on the intake manifold, and
tighten the screw (3).
5. Connect the ignition line and the ground connection to
the ignition electrode (5).
6. Insert the cable (7) from the fan motor, the PWM signal
cable on the underside of the fan (8) and the cable to
the gas valve (10).
7. Connect the gas line (9) using a new seal. In the process, secure the gas pipe against twisting.
8. Open the gas isolator cock.
9. Make sure that there are no leaks.
8.10 Draining the product
1. Close the service valves of the product.
2. Open the drain valves on the service valves.
3. Ensure that the automatic air vent cap on the air separator is open so that the product can be drained fully.
28 Installation and maintenance instructions ecoTEC plus 0020214491_01
Troubleshooting 9
8.11 Checking the pre-charge pressure of the external expansion vessel
1. Depressurise the heating installation.
2. Measure the pre-charge pressure of the expansion ves-
sel at the vessel valve.
3. Fill the expansion vessel with air at a pre-charge pres-
sure of less than 0.075 (0.75 bar) according to the static
head of the heating installation.
4. If water escapes from the valve of the expansion ves-
sel, you must replace the expansion vessel.
8.12 Completing inspection and maintenance work
▶ Check the CO₂ content and, if necessary, adjust it (air
index setting). (→ Page 21)
▶ Check the CO₂ content and, if necessary, adjust it (air
index setting). (→ Page 21)
▶ If required, reset the maintenance interval (→ Page 24).
8.13 Checking the product for leak-tightness
▶ Check that the product is leak-tight. (→ Page 22)
9 Troubleshooting
You can find an overview of the fault codes in the appendix.
Overview of fault codes (→ Page 35)
9.3 Reading off the fault codes
If a fault develops in the product, the display shows a fault
code F.xx.
Fault codes have priority over all other displays.
If multiple faults occur at the same time, the display shows
the corresponding fault codes for two seconds each in sequence.
▶ Rectify the fault.
▶
To restart the product, press (→ Operating instructions).
▶ If you are unable to rectify the fault and the fault recurs
despite several reset attempts, contact Customer Service.
9.4 Querying the fault memory
The product has a fault memory. You can use this to query
the last ten faults that occurred in chronological order.
▶
Press and at the same time to display the last ten
faults that occurred.
Overview of fault codes (→ Page 35)
▶
Use to scroll back in the fault memory.
▶
To exit the fault memory display, press or do not
press any button for approximately four minutes.
◁ Depending on the settings, the current flow temperat-
ure or current water pressure of the heating installation reappears in the display.
9.1 Contacting your service partner
If you contact your service partner, if possible, please mention
– the fault code that is displayed (F.xx),
– the product status (S.xx) that is displayed.
9.2 Calling up status codes
You can find an overview of the status codes in the
appendix.
Status codes – Overview (→ Page 34)
▶
To call up the display of the status codes, press .
◁ The display shows the status code, e.g. S.4 for
"Burner mode: Heating".
▶
To exit the status codes display, press or do not press
any button for approximately four minutes.
◁ Depending on the settings, the current flow temperat-
ure or current water pressure of the heating installation reappears in the display.
9.5 Performing diagnostics
▶ You can use the diagnostics codes (→ Page 23) during
fault diagnostics to change individual parameters or to
display further information.
9.6 Using check programmes
▶ You can also use the check programmes (→ Page 16)for
troubleshooting.
9.7 Resetting parameters to factory settings
▶ To simultaneously reset all parameters to the default
settings, set D.96 to 1.
9.8 Preparing the repair work
1. Decommission the product.
2. Disconnect the product from the power mains.
3. Remove the front casing. (→ Page 10)
4. Close the gas isolator cock.
5. Close the service valves in the heating flow and in the
heating return.
6. Close the service valve in the cold water pipe.
7. Drain the product if you want to replace water-bearing
components of the product.
8. Make sure that water does not drip on live components
(e.g. the electronics box).
9. Use only new seals.
0020214491_01 ecoTEC plus Installation and maintenance instructions 29
10 Decommissioning the product
1
9.9 Replacing defective components
9.9.1 Replacing the burner
1. Remove the compact thermal module. (→ Page 26)
2. Remove the four screws (1) from the burner.
3. Remove the burner.
4. Fit the new burner with a new seal.
5. Make sure that the cutouts in the seal and the burner
are situated above the burner flange sight glass.
6. Install the compact thermal module. (→ Page 28)
9.9.2 Replacing the PCB and/or the display
Note
If you are replacing only one component, the set
parameters are transferred automatically. When
the product is switched on, the new component
adopts the previously set parameters from the
unreplaced component.
9.10 Completing repair work
▶ Check that the product works correctly.
10 Decommissioning the product
▶ Switch off the product.
▶ Disconnect the product from the power mains.
▶ Close the gas isolator cock.
▶ Drain the product. (→ Page 28)
11 Recycling and disposal
Disposing of the packaging
▶ Dispose of the packaging correctly.
▶ Observe all relevant regulations.
12 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: 0330 100 3461
1. Disconnect the product from the power mains and make
sure that it cannot be switched back on again.
Conditions: Replacing the display or PCB
▶ Replace the PCB or display according to the assembly
and installation instructions supplied.
Conditions: Replacing the PCB and display at the same time
▶ Replace the PCB and display according to the assembly
and installation instructions supplied.
◁ If you replace both components at the same time, the
product switches to fault mode and displays the fault
message F.70 after it is switched on.
▶ In the second diagnostics level under the diagnostics
code d.93, enter the number of the product type.
▶ Confirm your setting.
◁ The electronics are now set to the product type and
the parameters of all diagnostics codes are set to
default settings.
▶ Make the system-specific settings.
30 Installation and maintenance instructions ecoTEC plus 0020214491_01
Appendix
A Overview of diagnostics codes
Note
Since the code table is used for various products, some codes may not be visible for the product in question.
Appendix
Parameter Values or explanations
Code
D.0 Heating partial load, adjustable val-
ues in kW
D.1 Internal heating pump overrun time 2 … 60 min 5 min
D.2 Max. burner anti-cycling time heating
at 20 °C flow temperature
D.4 Measured value for the cylinder tem-
perature in °C
D.5 Flow temperature target value (or
return target value) in °C
D.7 Target cylinder temperature (15 °C = frost protection, 40 °C up to D.20 (max. 70 °C)) Not
D.8 Room thermostat at terminals 3-4 0 = Room thermostat open (no heat requirement)
D.9 Target feed temperature in °C from
the external continuous controller at
terminal 7-8-9/BUS
D.10 Status of the internal heating pump 0 = Off
D.11 Status of additional external heating
pump
D.12 Status of cylinder charge pump 0 = Off
D.13 Status of circulation pump 0 = Off
D.14 Setting for speed-controlled internal
heating pump
D.15 Current speed of the internal heating
pump in %
D.17 Control type 0 = Flow control
D.18 Pump operating mode (overrun) 0 = Overrun
D.20 Max. setting for cylinder target value Adjustment range: 40-70 °C 65 ℃
D.22 External cylinder charging, terminal
C1-C2
D.23 Summer/winter mode (heating off/on) 0 = Heating off (Summer mode)
D.24 Not relevant Not relevant
1. Five-digit numbers are saved for diagnostics codes 80 to 83. If you select D.80, for example, only the first two digits of the number
will be displayed (e.g. 10). Pressing switches the display to the last three digits (e.g. 947). In this example, the number of operating hours for the heating is 10947 hrs. Pressing the again causes the display to switch back to the diagnostics code that was
called up.
Adjustable heating partial load Approx. 70%
2 … 60 min 20 min
If a domestic hot water cylinder with sensor is connected Not
Current target value, max. of the value set in D.71, restricted by an eBUS controller, if connected
1 = Room thermostat closed (heat requirement)
Minimum from the external BUS target value and target
value for terminal 7
1 = On
0 = Off
1-100 = On
1-100 = On
1-100 = On
0 = Auto
1 = 53
2 = 60
3 = 70
4 = 85
5 = 100
in %
1 = Return flow temperature control
1 = Continuous
2 = Winter
3 = Intermittent
1 = on, 0 = off
1 = Heating on
Default setting
of the maximum output
0
0
3
Own setting
adjustable
Not
adjustable
adjustable
Not
adjustable
Not
adjustable
Not
adjustable
Not
adjustable
Not
adjustable
Not
adjustable
Not
adjustable
Not
adjustable
0020214491_01 ecoTEC plus Installation and maintenance instructions 31
Appendix
Parameter Values or explanations
Code
D.25 Hot water generation enabled by
eBUS controller
D.26 Internal accessory relay at X6 (pink
plug)
D.27 Switching accessory relay 1 for
accessory "2-in-7" multi-functional
module
D.28 Switching accessory relay 2 for
accessory "2-in-7" multi-functional
module
D.30 Control signal for gas valve 0 = Off; 1 = On Not
D.33 Fan speed target value in rpm/10 Not
D.34 Fan speed actual value in rpm/10 Not
D.35 Not relevant Not relevant
D.40 Flow temperature Actual value in °C Not
D.41 Return temperature Actual value in °C Not
D.44 Digitalised ionisation voltage Display field 0 to 102
D.47 Outside temperature (with weather
compensator)
D.50 Offset for minimum speed in rpm/10, adjustment range: 0 to 300 30
D.51 Offset for maximum speed in rpm/10, adjustment range: -99 to 0 -45
D.60 Number of temperature limiter shut-
downs
D.61 Number of ignition device cutoffs Number of unsuccessful ignitions in the last attempt Not
D.64 Average ignition time In seconds Not
D.65 Maximum ignition time In seconds Not
D.67 Remaining burner anti-cycling time In minutes Not
D.68 Unsuccessful ignitions at 1st attempt Number of unsuccessful ignitions Not
D.69 Unsuccessful ignitions at 2nd at-
tempt
D.70 Not relevant Not relevant
D.71 Maximum target value heating flow
temperature
1. Five-digit numbers are saved for diagnostics codes 80 to 83. If you select D.80, for example, only the first two digits of the number
will be displayed (e.g. 10). Pressing switches the display to the last three digits (e.g. 947). In this example, the number of operating hours for the heating is 10947 hrs. Pressing the again causes the display to switch back to the diagnostics code that was
called up.
1 = Yes, 0 = No
1 = Circulation pump
2 = Second external pump
3 = Cylinder charging pump
4 = Flue non-return flap/extractor hood
5 = External gas valve
6 = External fault message
1 = Circulation pump
2 = Second external pump
3 = Cylinder charging pump
4 = Flue non-return flap/extractor hood
5 = External gas valve
6 = External fault message
1 = Circulation pump
2 = Second external pump
3 = Cylinder charging pump
4 = Flue non-return flap/extractor hood
5 = External gas valve
6 = External fault message
>80 no flame
< 40 good flame
Actual value in °C, if the outside temperature sensor is
connected to X41
Number of shutdowns Not
Number of unsuccessful ignitions Not
40 … 85 ℃ 75 ℃
Default setting
2
2
3
Own setting
adjustable
adjustable
adjustable
adjustable
adjustable
Not
adjustable
Not
adjustable
adjustable
adjustable
adjustable
adjustable
adjustable
adjustable
adjustable
32 Installation and maintenance instructions ecoTEC plus 0020214491_01
Appendix
Parameter Values or explanations
Code
D.72 Pump overrun after cylinder charging Adjustable from 0 to 600 seconds 80 s
D.75 Max. charging time for domestic hot
water cylinder without independent
control system
D.76 Unit variant: Device-specific number
(DSN)
D.77 Limit on cylinder charging output inkWAdjustable cylinder charging output in kW Maximum
D.78 Cylinder charging temperature limit
(target flow temperature in cylinder
charging mode) in °C
D.80 Operating hours, heating in hrs ¹ Not
D.81 Operating hours, hot water genera-
tion
D.82 Number of burner start-ups in heat-
ing mode
D.83 Number of burner start-ups in hot
water mode
D.84 Maintenance indicator: Number of
hours until the next maintenance
D.90 Status of digital controller 0 = Not recognised (eBUS address ≤ 10)
D.91 Status of DCF with external temper-
ature sensor connected
D.93 Product type setting (device specific
number)
D.96 Default setting Reset all adjustable parameters to factory setting
D.97 Activating the installer level Service code 17
D.98 Telephone: Competent person Programmable telephone number
1. Five-digit numbers are saved for diagnostics codes 80 to 83. If you select D.80, for example, only the first two digits of the number
will be displayed (e.g. 10). Pressing switches the display to the last three digits (e.g. 947). In this example, the number of operating hours for the heating is 10947 hrs. Pressing the again causes the display to switch back to the diagnostics code that was
called up.
20 - 90 min 45 minutes
.. 656/4‑5 = 47
55 °C-85 °C 80 ℃
in hrs ¹ Not
Number of burner start-ups /100 (3 equals 300) ¹ Not
Number of burner start-ups /100 (3 equals 300) ¹ Not
Adjustment range: 0 to 3000 hrs and "-" for deactivated
300 equals 3000 hrs
1 = Recognised
0 = No reception
1 = Reception
2 = Synchronised
3 = Valid
Setting range: 0 to 99
.. 656/4‑5 = 47
0 = No
1 = Yes
Default setting
output
„-”
0
Own setting
adjustable
adjustable
adjustable
adjustable
Not
adjustable
Not
adjustable
B Inspection and maintenance work – Overview
The table below lists the manufacturer requirements with respect to minimum inspection and maintenance intervals. If national regulations and directives require shorter inspection and maintenance intervals, you should observe these instead of
the intervals listed in the table.
Mainten-
No. Work
Check the flue pipe for leak-tightness and to ensure that it is fastened correctly. Make sure that
1
it is not blocked or damaged and has been installed in accordance with the relevant Installation
Manual.
Check the general condition of the product. Remove dirt from the product and from the vacuum
2
chamber.
Visually inspect the general condition of the compact thermal module. In doing so, pay particular
3
attention to signs of corrosion, rust and other defects. If you notice any damage, carry out maintenance work.
Check the gas flow pressure at maximum heat input. If the gas flow pressure is not within the
4
correct range, carry out maintenance work.
0020214491_01 ecoTEC plus Installation and maintenance instructions 33
Inspection
(annual)
X X
X X
X X
X X
ance
(At least
every
two years)
Appendix
No. Work
Check the CO₂ content (the air ratio) of the product and, if necessary, adjust it. Keep a record of
5
this.
Disconnect the product from the power mains. Check that the electrical plug connections and
6
other connections are seated correctly and correct these if necessary.
7 Close the gas isolator cock and the service valves. X
Drain the product on the water side (observe the pressure gauge). Check the pre-charge pres-
8
sure of the expansion vessel, and top up the vessel if necessary (approx. 0.03 MPa/0.3 bar under the system filling pressure).
9 Remove the compact thermal module. X
10 Install the burner insulation on the back wall of the heat exchanger. X
11 Clean the heat exchanger. X
Replace the burner insulation (article number 0020093190) on the back wall of the heat ex-
12
changer. Replace the burner insulation each time maintenance work is carried out.
Check the burner insulation on the burner flange. If you notice any damage, replace the burner
13
insulation (article number 180913). Replace the burner flange seal (article number 180904) each
time it is opened and, accordingly, each time maintenance work is carried out.
14 Check the burner for damage and replace it if necessary. X
15 Check the condensate trap in the product, and clean and fill this, if required. X X
16 Clean the condensate duct in the product. X
17 Install the compact thermal module. Caution: Replace the seals (article number 130904). X
18 Clean the air separation system. X
19 Open the gas isolator cock, reconnect the product to the power mains and switch the product on. X X
Open the service valves, fill up the product/heating installation to 0.1-0.2 MPa/1.0-2.0 bar (de-
20
pending on the static height of the heating installation) and start the purging programme P.0.
Perform a test operation of the product and heating installation, including hot water generation,
21
and purge the system once more if necessary.
22 Check the product's gas ratio setting and, if required, reset it. Log the setting. X
23 Visually inspect the ignition and burner behaviour. X X
24 Check the CO₂ content (the air ratio) of the product again. X
Ensure that no gas, flue gas, hot water or condensate is leaking from the product. Restore leak-
25
tightness if necessary.
26 Record the inspection/maintenance work carried out. X X
Inspection
(annual)
X X
X X
X X
X X
Mainten-
ance
(At least
every
two years)
X
X
X
X
C Status codes – Overview
Status code Meaning
Heating mode
S.0 Heating: No heat demand
S.1 Heating mode: Fan start-up
S.2 Heating mode: Pump pre-run
S.3 Heating mode: Ignition
S.4 Heating mode: Burner on
S.5 Heating mode: Pump/fan overrun
S.6 Heating mode: Fan overrun
S.7 Heating mode: Pump overrun
S.8 Heating mode: Remaining anti-cycling time
Cylinder charging mode
S.20 DHW demand
S.21 DHW mode: Fan start-up
S.22 DHW mode: Pump pre-run
S.23 DHW mode: Ignition
34 Installation and maintenance instructions ecoTEC plus 0020214491_01
Status code Meaning
S.24 DHW mode: Burner on
S.25 DHW mode: Pump/fan overrun
S.26 DHW mode: Fan overrun
S.27 DHW mode: Pump overrun
S.28 Hot water burner anti-cycling time
Special cases
S.30 Room thermostat (RT) is blocking heating mode
S.31
S.32 Waiting period because of fan speed deviation
S.34 Frost protection mode active
S.36 Reference setting for the continuous controller 7-
S.39 Contact thermostat tripped
S.41 Water pressure > 0.28 MPa (2.8 bar)
S.42 Flue non-return flap return signal blocks burner
S.53 Product is within the waiting period of the mod-
S.54 Product is within the waiting period of the oper-
S.59 Waiting period: Minimum volume of circulation
S.85 Service message: "Check circulation water
S.96 Return sensor test running, heating demands are
S.97 Water pressure sensor test running, heating de-
S.98 Flow/return sensor test running, heating de-
Summer mode active or no heat requirement
from eBUS controller
8-9 or eBUS controller is < 20 °C and blocks the
heating mode
operation (only in connection with accessories)
or condensate pump faulty, heat requirement is
blocked.
ulation block/operation block function as a result of low water pressure (flow/return spread too
large)
ation blocking function as a result of low water
pressure (temperature gradient)
water not achieved
quantity".
blocked.
mands are blocked.
mands are blocked.
Appendix
D Overview of fault codes
Code Meaning Cause
F. 0 Flow temperature sensor interruption NTC plug not plugged in or has come loose, multiple plug on the PCB
F. 1 Return temperature sensor interruption NTC plug not plugged in or has come loose, multiple plug on the PCB
F.10 Flow NTC short circuit NTC defective, short circuit in cable harness, cable/casing
F.11 Return NTC short circuit NTC defective, short circuit in cable harness, cable/casing
F.13 Cylinder temperature sensor short circuit NTC defective, short circuit in cable harness, cable/casing
F.20 Safety switch-off: Temperature limiter Incorrect earth connection between cable harness and product, flow or
F.22 Safety switch-off: Low water pressure No or insufficient water in the product, water pressure sensor defective,
F.23 Safety switch-off: Temperature difference too
great
F.24 Safety switch-off: Temperature rise too fast Pump blocked, insufficient pump output, air in product, system pressure
0020214491_01 ecoTEC plus Installation and maintenance instructions 35
not plugged in correctly, interruption in cable harness, NTC defective
not plugged in correctly, interruption in cable harness, NTC defective
return NTC defective (loose connection), black discharge via ignition
cable, ignition plug or ignition electrode
cable to pump or water pressure sensor loose/not connected/defective
Pump blocked, insufficient pump output, air in product, flow and return
NTC connected the wrong way round
too low, non-return valve blocked/incorrectly installed
Appendix
Code Meaning Cause
F.27 Safety switch-off: Flame simulation Moisture on the electronics, electronics (flame monitor) defective, gas
F.28 Failure during start-up: Ignition unsuccessful Gas meter defective or gas pressure monitor has triggered, air in gas,
F.29 Failure during operation: Re-ignition unsuccess-
ful
F.32 Fan fault Plug on fan not correctly plugged in, multiple plug on PCB not correctly
F.49 Fault: eBUS Short circuit on eBUS, eBUS overload or two power supplies with differ-
F.61 Gas valve actuation fault The gas valve cannot be actuated
F.62 Gas valve switch-off delay Delayed shutdown of gas valve detected
F.63 Fault: EEPROM Electronics defective
F.64 Fault: Electronics/NTC Flow or return NTC short circuited, electronics defective
F.65 Fault: Electronics temp. Electronics overheating due to external influences, electronics defective
F.67 Fault: Electronics/flame Implausible flame signal, electronics defective
F.70 Invalid device specific number (DSN) If spare parts fitted: Display and PCB replaced at same time and DSN
F.71 Flow NTC fault Flow temperature sensor signalling constant value:
F.72 Flow/return NTC fault Flow/return NTC temperature difference too great → flow and/or return
F.73 Water pressure sensor signal in the wrong range
(too low)
F.74 Water pressure sensor signal outside correct
range (too high)
F.75 Fault: No pressure change detection when start-
ing pump
F.77 Fault: Flue non-return flap/condensate pump No response from flue non-return flap or condensate pump defective
con No communication with the PCB Communication fault between display and PCB in the electronics box
solenoid valve leaking
gas flow pressure too low, thermal isolator device (TAE) has triggered,
condensate duct blocked, incorrect gas restrictor, incorrect spare part
gas valve, fault on the gas valve, multiple plug on PCB incorrectly
plugged in, break in cable harness, ignition system (ignition transformer,
ignition cable, ignition plug, ignition electrode) defective, ionisation
current interrupted (cable, electrode), incorrect earthing of product,
electronics defective
Gas supply temporarily stopped, flue gas recirculation, condensate duct
blocked, defective earthing of product, ignition transformer has spark
failure
plugged in, break in cable harness, fan blocked, Hall sensor defective,
electronics defective
ent polarities on the eBUS
– Cable harness supply line to the gas valve is defective (short to
earth, short circuit)
– Gas valve defective
– PCB defective
– Secondary light (ignition and monitoring electrode indicates delayed
extinguishing of the flame signal)
– Gas valve defective
– PCB defective
not reset, incorrect or missing output range coding resistance
– Flow temperature sensor incorrectly positioned at supply pipe
– Flow temperature sensor defective
temperature sensor defective
Interruption/short circuit of water pressure sensor, interruption/short
circuit to GND in supply line to water pressure sensor or water pressure
sensor defective
Line to water pressure sensor has a short circuit to 5 V/24 V or internal
fault in the water pressure sensor
Water pressure sensor and/or pump defective, air in the heating installation, insufficient water in the product; check adjustable bypass, connect
external expansion vessel to the return
36 Installation and maintenance instructions ecoTEC plus 0020214491_01
E Connection diagram
Ignition electrode
Appliance earth
Ignition unit
X14
green/yellow
Cylinder thermostat (accessory)
"C1/C2"
Gas valve
Flow Switch
Flow sensor
Flow sensor
Water pressure sensor
Cylinder sensor
P
Return sensor
Fa n
Mains
X20
X2
Extra-low voltage plug
natural
1
2
4
+
signal
-
1 Earth
2 Hall signal
3
4 PWM signal
5 + 24 V
black
4
2
5
9
11
12
13
1
17
3
4
16
5
7
8
12
13
14
6
10
18
9
15
2
14
10
brown
black
black
black
black
black
black
black
black
black
black
black
grey
red
red
red
blue
blue
blue
green
red
red
green
orange
violet
Coding resistance
1210
X11
Appendix
0020214491_01 ecoTEC plus Installation and maintenance instructions 37
Appendix
X13
X11
Fa n
230 V~
N
L
N
L
grey
N
L
blue
green
X18
5
4
3
N
L
9
8
7
+
2
FB
AF
RF
DCF
0
0
1
-
turquoise
violetwhiteredblue
Supply voltageExtra-low voltage
Edge connector
X1
X41
X22
6
1
X6
pink
N
L
Option: Ext. controller/room thermostat 3-4
(Contact)
Option: Ext. controller/room thermostat 7-8-9
(continuous, analogue)
Option: Bus connection (controller/digital room therm.)
Option: Contact thermostat
Mains input
Internal pump
Plug for controller accessory
VRC 4xx or ZP control system
Circulation pump remote control
External sensor
Low loss header sensor
DCF connection
Earth
Earth
PWM signal: Internal pump
24 V 230 V~
Fa n
Auxiliary relay (can be adjusted under D.26)
Cylinder
charging pump
38 Installation and maintenance instructions ecoTEC plus 0020214491_01
F Commissioning Checklist
© Heating and Hotwater Industry Council (HHIC)
www.centralheating.co.uk
Benchmark Commissioning and
Servicing Section
It is a requirement that the boiler is installed and commissioned to the
completed in full.
Appendix
0020214491_01 ecoTEC plus Installation and maintenance instructions 39
Appendix
This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating
compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference.
GAS BOILER SYSTEM COMMISSIONING CHECKLIST
CONTROLS
Optimum start control
Fitted
Fitted
Fitted
Fitted
ALL SYSTEMS
Yes
Yes
CENTRAL HEATING MODE
OR
mbar OR mbar
COMBINATION BOILERS ONLY
Yes
Yes
DOMESTIC HOT WATER MODE
OR
mbar OR mbar
Yes Temperature
CONDENSING BOILERS ONLY
Yes
ALL INSTALLATIONS
AND
²
Ratio
AND
²
Ratio
Yes
Yes
Yes
Yes
40 Installation and maintenance instructions ecoTEC plus 0020214491_01
It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed.
Service Provider
SERVICE RECORD
SERVICE 01
AND
²
%
AND
²
%
SERVICE 02
AND
²
%
AND
²
%
SERVICE 03
AND
²
%
AND
²
%
SERVICE 04
AND
²
%
AND
²
%
SERVICE 05
AND
²
%
AND
²
%
SERVICE 06
AND
²
%
AND
²
%
SERVICE 07
AND
²
%
AND
²
%
SERVICE 08
AND
²
%
AND
²
%
SERVICE 09
AND
²
%
AND
²
%
SERVICE 10
AND
²
%
AND
²
%
Appendix
0020214491_01 ecoTEC plus Installation and maintenance instructions 41
Appendix
PRIOR TO CO AND COMBUSTION RATIO CHECK
The boiler manufacturer’s installation instructions should have been followed, gas type verified and gas
supply pressure/rate checked as required prior to commissioning.
As part of the installation process, especially where a flue has been fitted by persons other than the
boiler installer, visually check the integrity of the whole flue system to confirm that all components are
correctly assembled, fixed and supported. Check that manufacturer’s max. flue lengths have not been
exceeded and all guidance has been followed (e.g. Gas Safe Technical Bulletin TB008).
The flue gas analyser should be of the correct type, as specified by BS 7967
Prior to its use, the flue gas analyser should have been maintained and calibrated as specified by the
manufacturer. The installer must have the relevant competence for use of the analyser.
Check and zero the analyser IN FRESH AIR as per analyser manufacturer’s instructions.
NOTE
THE AIR GAS RATIO VALVE IS FACTORY
SET AND MUST NOT BE ADJUSTED
DURING COMMISSIONING UNLESS THIS
ACTION IS RECOMMENDED FOLLOWING
CONTACT WITH THE MANUFACTURER.
If any such adjustment is recommended and
further checking of the boiler is required the
installer/service engineer must be competent
to carry out this work and to use the flue gas
analyser accordingly.
If the boiler requires conversion to operate with
a different gas family (e.g. conversion from
natural gas to LPG) separate guidance will be
provided by the boiler manufacturer
CARRY OUT FLUE INTEGRITY CHECK USING ANALYSER
Insert analyser probe into air inlet test point and allow readings to stabilise.
NOTE - where no air inlet test point is provided then a flue integrity check
with the analyser is not possible. The installer should verify that flue
integrity has been visually checked in accordance with the “Prior to
CO and combustion ratio check” box above before proceeding to the
“Check CO and combustion ratio at maximum rate” stage below.
SET BOILER TO MINIMUM RATE
In accordance with boiler instructions, set boiler to operate at minimum rate (to
minimum load condition). Allow sufficient time for combustion to stabilise.
NOTE - If manufacturer’s instructions do not specify how to set boiler to minimum
rate contact Technical Helpline for advice.
CHECK CO AND COMBUSTION RATIO AT MINIMUM RATE
With boiler still set at minimum rate, insert analyser probe into flue gas sampling
point. Allow readings to stabilise before recording.
NOTE - If no flue gas sampling point is present and the correct procedure is not
specified in the manual, consult boiler manufacturer for guidance.
CHECK CO AND COMBUSTION RATIO AT MAX. RATE
With boiler still set at maximum rate, insert analyser probe into flue gas
sampling point. Allow readings to stabilise before recording.
NOTE - If no flue gas sampling point is present and the correct procedure is
not specified in the manual, consult boiler manufacturer for guidance.
SET BOILER TO MAXIMUM RATE
In accordance with boiler instructions, set boiler to operate at max. rate
(full load condition). Allow sufficient time for combustion to stabilise.
NOTE - Do not insert analyser probe during this period to avoid
possible “flooding” of sensor.
Is
CO less than
350ppm and
CO/CO
2
ratio
less than 0.004
Is
O
2
20.6%
and
CO
2
< 0.2%
Is
CO less than
350ppm and
CO/CO
2
ratio
less than 0.004
BOILER IS OPERATING SATISFACTORILY
no further actions required.
Ensure test points are capped, boiler case is correctly replaced and
all other commissioning procedures are completed.
Complete Benchmark Checklist, recording CO and combustion ratio
readings as required.
TURN OFF APPLIANCE AND CALL
MANUFACTURER’S TECHNICAL HELPLINE
FOR ADVICE.
THE APPLIANCE MUST NOT BE
COMMISSIONED UNTIL PROBLEMS ARE
IDENTIFIED AND RESOLVED.
VERIFY FLUE INTEGRITY
Analyser readings indicate that combustion products
and inlet air must be mixing. Further investigation of
the flue is therefore required.
Check that flue components are assembled, fixed
and supported as per boiler/flue manufacturer’s
instructions.
Check that flue and flue terminal are not obstructed.
Is
CO
less than
335ppm
and
CO/CO
2
ratio less
than 0.004
Is
O
2
20.6%
and
CO
2
< 0.2%
Check all seals around the appliance burner,
internal flue seals, door and case seals.
Rectify where necessary.
TURN OFF APPLIANCE AND CALL
MANUFACTURER’S TECHNICAL HELPLINE
FOR ADVICE.
THE APPLIANCE MUST NOT BE
COMMISSIONED UNTIL PROBLEMS ARE
IDENTIFIED AND RESOLVED. IF
COMMISSIONING CANNOT BE FULLY
COMPLETED, THE APPLIANCE MUST BE
DISCONNECTED FROM THE GAS SUPPLY IN
ACCORDANCE WITH THE GSIUR.
NOTE: Check and record CO and combustion ratio
at both max. and min. rate before contacting the
manufacturer.
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
42 Installation and maintenance instructions ecoTEC plus 0020214491_01
G Opening of the flue pipe
G
N
N
MM
A
I
I
O
H
H
C
B
L
J
Q
Q
Q
Q
Q
K
P
D, E
F
I
S
R
T
Appendix
G.1 Positioning of the opening of a fan-supported flue gas guiding
Installation site
A
B Above an opening, air bricks, opening windows, etc., that can be opened. 300 mm
C Horizontally to an opening, air bricks, opening windows, etc., that can be opened. 300 mm
D
E Below eaves 200 mm
F Below balconies or car port roofs 200 mm
G From vertical wastewater pipes or down pipes 150 mm
H From external or internal corners 200 mm
I Above floors, roofs or balconies 300 mm
J From a surface facing a terminal 600 mm
K From a terminal facing a terminal 1200 mm
L From an opening in the car port (e.g. door, window) which leads into the dwelling 1200 mm
M Vertical from a terminal on the same wall 1500 mm
N Horizontal from a terminal on the same wall 300 mm
O From the wall on which the terminal has been installed 0 mm
P From a vertical structure on the roof N/A
Q Above the roof area 300 mm
R Horizontal from adjacent windows on pitched or flat roofs 600 mm
S Above adjacent windows on pitched or flat roofs 600 mm
T Below adjacent windows on pitched or flat roofs 2000 mm
Directly below an opening, air bricks, opening windows, etc., that can be opened. 300 mm
Below temperature-sensitive building components, e.g. plastic gutters, down pipes or wastewater
pipes
Minimum dimensions
75 mm
0020214491_01 ecoTEC plus Installation and maintenance instructions 43
Appendix
Balcony/eaves
Gutter
Adequately secured
air/flue gas pipe
The flue pipe must
protrude beyond any overhang
H Horizontal terminal positioning
BS 5440-1 recommends that fanned flue chimney terminals should be positioned as follows:
a) at least 2 m from an opening in the building directly opposite, and
b) so that the products of combustion are not directed to discharge directly across a boundary if the products are likely to
cause a nuisance to a neighbour or discharge over a walkway or patio.
For IE see current issue of IS 813.
For boilers covered within this manual.
1) Dimensions D, E, F and G:
These clearances may be reduced to 25 mm without affecting the performance of the boiler. In order to ensure that the condensate plume does not affect adjacent surfaces the terminal should be extended as shown below.
2) Dimension H:
This clearance may be reduced to 25 mm without affecting the performance of the boiler. However, in order to ensure that
the condensate plume does not affect adjacent surfaces a clearance of 300 mm is preferred.
For 1 and 2 above you can use a flue gas management kit to enable the termination point to be positioned and directed away
from the building fabric.
I Technical data
Technical data – Power/load
The lowest nominal heat output may be higher than the value in the technical data, depending on the design of the system
and the current operating status.
VU GB 656/4-5 A
Nominal heat output range P at 40/30 °C
Nominal heat output range P at 50/30 °C
Nominal heat output range P at 60/40 °C
Nominal heat output range P at 80/60 °C
Maximum heat input, heating side
Minimum heat input heating side
Technical data – Heating
Maximum flow temperature
Max. flow temperature adjustment range (default setting:
75 °C)
Permissible total overpressure
Circulation water volume (with reference to ΔT= 20 K)
Approx. condensate rate (pH value approx. 3.7) in heating mode at 40/30 °C
14.9 … 69.2 kW
14.6 … 67.6 kW
14.1 … 65.7 kW
13.8 … 63.7 kW
65.0 kW
14.0 kW
VU GB 656/4-5 A
90 ℃
35 … 85 ℃
0.3 MPa
(3.0 bar)
2,750 l/h
6.5 l/h
44 Installation and maintenance instructions ecoTEC plus 0020214491_01
Technical data – cylinder charging mode
Maximum heat input in cylinder charging mode
Cylinder charging output
Technical data – General
Gas connection, boiler side
Flow/return heating connections, inside thread, boiler
side
Flow/return heating connections, outside thread, boiler
side
Gas connection pressure, G20 natural gas
Gas flow at 15 °C and 1013 mbar (based on hot water
generation if applicable), G20
Min. flue gas mass rate
Max. flue gas mass rate
Min. flue gas temperature
Max. flue gas temperature
Permissible pressure difference in the flue gas pipe for
installation type B23P as a single occupancy max.
Permissible pressure difference in the flue gas pipe for
installation type B23P as multiple occupancy max.
30% efficiency
NOx class
Boiler dimension, width
Boiler dimension, height
Boiler dimension, depth
Approx. net weight
Appendix
VU GB 656/4-5 A
65.0 kW
Such as heating
VU GB 656/4-5 A
1″
1″
1,5″
2.0 kPa
(20.0 mbar)
6.9 m³/h
6.5 g/s
30.3 g/s
40 ℃
70 ℃
190 Pa
50 Pa
108 %
5
480 mm
800 mm
472 mm
75 kg
Technical data – Electrics
Rated voltage
Built-in fuse (slow-blow)
Max. electrical power consumption
Electrical power consumption, 30%
Level of protection
Test symbol/registration no.
VU GB 656/4-5 A
230 V/50 Hz
2 A
249 W
159 W
IP X4 D
CE-0085BS0402
0020214491_01 ecoTEC plus Installation and maintenance instructions 45
Index
Index
A
Air index setting...................................................................21
Air separator........................................................................ 28
Air separator, filter ............................................................... 28
Air/flue pipe .........................................................................14
Air/flue pipe, installed ............................................................ 5
Article number .......................................................................8
Automatic air vent................................................................ 18
B
Burner anti-cycling time.......................................................24
C
Calling up diagnostics codes...............................................23
Carrying out inspection work ............................................... 25
Carrying out maintenance work........................................... 25
CE label................................................................................. 8
Check programmes ............................................................. 16
Checking the burner ............................................................ 27
Checking the CO₂ content ................................................... 21
Checking the pre-charge pressure of the expansion
vessel ..................................................................................29
Circulation pump ................................................................. 16
Cleaning the condensate duct and the condensate trap..... 27
Compact thermal module ................................................6, 26
Competent person................................................................. 4
Completing inspection work ................................................ 29
Completing maintenance work............................................ 29
Completing repair work ....................................................... 30
Completing, repair work ...................................................... 30
Condensate drain pipework.................................................13
Condensate duct .................................................................27
Connecting the controller .................................................... 15
Connection dimensions......................................................... 9
Corrosion............................................................................... 6
Corrugated gas pipe.............................................................. 6
D
Decommissioning................................................................30
Decommissioning the product.............................................30
Descaling the heat exchanger............................................. 27
Descaling, heat exchanger.................................................. 27
Diagnostics level ................................................................. 23
Disposal, packaging ............................................................30
Disposing of the packaging ................................................. 30
Documents ............................................................................7
Draining the product ............................................................ 28
E
Electricity ............................................................................... 5
Expansion relief valve ......................................................... 13
F
Fault codes....................................................................29, 35
Fault memory ...................................................................... 29
Filling pressure .................................................................... 18
Filling the condensate siphon..............................................19
Filling the condensate trap .................................................. 19
Filling the heating installation .............................................. 18
Filling, heating installation ................................................... 18
Filter, air separator .............................................................. 28
Flow temperature, maximum............................................... 24
Flue gas route .......................................................................5
From the delivery point to the installation site ....................... 8
Front casing, closed .............................................................. 5
Frost ......................................................................................6
G
Gas connection ................................................................... 12
Gas ratio setting .................................................................. 19
H
Handing the product over to the operator............................ 25
Handling ................................................................................8
Heat exchanger ................................................................... 26
Heating flow......................................................................... 13
Heating partial load .............................................................23
Heating return...................................................................... 13
Hot water temperature, risk of scalding.................................5
I
Identification plate ................................................................. 7
If you smell gas .....................................................................4
Inspection and maintenance intervals................................. 25
Installation clearances........................................................... 9
Installation site................................................................... 5–6
Installer level ....................................................................... 23
Installing the compact thermal module................................ 28
Installing the front casing..................................................... 10
Intended use..........................................................................4
L
Leak detection spray .............................................................6
M
Maintenance interval ...........................................................24
Minimum clearances ............................................................. 9
P
Performing diagnostics........................................................ 29
Power supply....................................................................... 15
Preparing the repair work .................................................... 29
Product dimensions............................................................... 9
Pump operating mode ......................................................... 23
Pump overrun...................................................................... 23
Purging the heating installation ........................................... 18
Purging, heating installation ................................................18
Q
Qualification...........................................................................4
R
Reading off the filling pressure............................................18
Regulations ........................................................................... 6
Removing the condensate trap ........................................... 27
Replacing the burner ........................................................... 30
Replacing the display ..........................................................30
Replacing the PCB .............................................................. 30
Replacing, display ...............................................................30
Replacing, PCB ................................................................... 30
Resetting parameters .......................................................... 29
Resetting, all parameters .................................................... 29
S
Safety device......................................................................... 5
Schematic drawing ................................................................ 5
Second diagnostics level..................................................... 23
Serial number ........................................................................ 8
Service partner .................................................................... 29
Setting the CO₂ content.......................................................21
Spare parts.......................................................................... 26
Supply of combustion air ....................................................... 5
Switching on the product ..................................................... 16
T
Tool ....................................................................................... 6
Transport ............................................................................... 6
46 Installation and maintenance instructions ecoTEC plus 0020214491_01
Treating the heating water................................................... 17
U
Unloading the box .................................................................8
V
Voltage ..................................................................................5
W
Wall-mounting the product .................................................. 10
Index
0020214491_01 ecoTEC plus Installation and maintenance instructions 47
0020214491_01
0020214491_01 04.01.2017
Supplier
Vaillant Ltd.
Nottingham Road Belper Derbyshire DE56 1JT
Telephone 0330 100 3461
info@vaillant.co.uk 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.
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