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
2
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
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