Vaillant ecoTEC plus Installation Manual
ecoTEC plus
VU, VUW ..6/5-5
en Installation and maintenance instructions
0020244997_06 - 17.02.2021
Installation and maintenance
instructions
Contents
1 Safety .................................................................... 4
1.1 Intended use.......................................................... 4
1.2 Qualification........................................................... 4
1.3 General safety information .................................... 4
1.4 Regulations (directives, laws, standards).............. 6
1.5 List of relevant standards for Great Britain and
Ireland.................................................................... 6
2 Guarantee and Customer Service...................... 7
3 Technical data...................................................... 8
4 Notes on the documentation ............................ 15
5 Product description........................................... 15
5.1 CE marking.......................................................... 15
5.2 Energy Saving Trust Endorsed Products ............ 15
5.3 Hot Water Association ......................................... 15
5.4 Information on the identification plate.................. 15
5.5 Serial number ...................................................... 16
5.6 Product design..................................................... 16
5.7 Safety Devices..................................................... 17
6 Set-up.................................................................. 18
6.1 Checking the scope of delivery............................ 18
6.2 Dimensions.......................................................... 18
6.3 Installation site..................................................... 19
6.4 Minimum clearances............................................ 19
6.5 Compartment Ventilation ..................................... 19
6.6 Air/flue pipe.......................................................... 19
6.7 Using the installation template............................. 22
6.8 Wall-mounting the product................................... 22
6.9 Removing/installing the front casing.................... 23
6.10 Removing/installing the side section ................... 23
7 Installation.......................................................... 24
7.1 Installation requirements ..................................... 24
7.2 Preparing for installation...................................... 24
7.3 Descaling the water ............................................. 24
7.4 Installing the gas connection ............................... 24
7.5 Checking the gas line for leak-tightness.............. 24
7.6 Installing the hot and cold water connection........ 25
7.7 Connecting the domestic hot water cylinder........ 25
7.8 Connecting the heating flow and heating
return ................................................................... 25
7.9 Installing the drain pipe on the expansion relief
valve .................................................................... 25
7.10 Connecting the condensate discharge pipe ........ 25
7.11 Flue installation.................................................... 28
7.12 Electrical installation ............................................ 28
8 Operation............................................................ 31
8.1 Operating concept ............................................... 31
8.2 Calling up the installer level................................. 31
8.3 Live Monitor (status codes) ................................. 31
8.4 Setting the hot water temperature ....................... 31
9 Start-up ............................................................... 32
9.1 Carrying out the initial start-up............................. 32
9.2 Switching the product on and off ......................... 32
9.3 Running the installation assistants ...................... 32
9.4 Restarting the installation assistants ................... 32
9.5 Test programmes................................................. 32
9.6 Performing a gas family check ............................ 33
9.7 Using check programmes.................................... 33
9.8 Checking and treating the heating water/filling
and supplementary water .................................... 33
9.9 Filling the condensate trap .................................. 34
9.10 Preventing low water pressure ............................ 34
9.11 Flushing the heating installation for the first
time ("cold") ......................................................... 34
9.12 Filling the heating installation .............................. 35
9.13 Purging the heating installation ........................... 35
9.14 Filling and purging the hot water system............. 36
9.15 Gas inspection..................................................... 36
9.16 Thoroughly flushing the heating installation
("hot")................................................................... 38
9.17 Checking leak-tightness ...................................... 38
10 Adapting the unit to the heating
installation.......................................................... 39
10.1 Burner anti-cycling time ....................................... 39
10.2 Setting the maintenance interval ......................... 39
10.3 Setting the pump output....................................... 40
10.4 Setting the bypass valve...................................... 40
11 Handing over to the end user ........................... 41
12 Inspection and maintenance ............................ 42
12.1 Complete Service Interval Record section .......... 42
12.2 Using original seals.............................................. 42
12.3 Inspection and maintenance................................ 42
12.4 Preparing the maintenance work......................... 42
12.5 Function menu..................................................... 42
12.6 Electronics self-test.............................................. 42
12.7 Checking the electrical plug connections ............ 42
12.8 Removing the compact thermal module.............. 42
12.9 Cleaning the heat exchanger............................... 43
12.10 Checking the burner ............................................ 43
12.11 Cleaning the condensate trap.............................. 44
12.12 Cleaning the strainer in the cold water inlet......... 44
12.13 Installing the compact thermal module................ 44
12.14 Draining the product ............................................ 44
12.15 Checking the pre-charge pressure for the
internal expansion vessel .................................... 44
12.16 Checking the filling pressure of the heating
installation............................................................ 45
12.17 Checking the quality of the heating water............ 45
12.18 Completing inspection and maintenance work .... 45
12.19 Checking the product for leak-tightness .............. 45
13 Troubleshooting ................................................ 45
13.1 Checking service messages................................ 45
13.2 Eliminating faults.................................................. 45
13.3 Calling up and clearing the fault memory ............ 45
13.4 Resetting parameters to factory settings............. 45
13.5 Preparing the repair work .................................... 45
2 Installation and maintenance instructions ecoTEC plus 0020244997_06
13.6 Replacing defective components......................... 46
13.7 Completing repair work........................................ 50
13.8 Checking the product for leak-tightness .............. 50
14 Decommissioning.............................................. 50
14.1 Temporarily decommissioning the product.......... 50
14.2 Permanently decommissioning the product......... 50
15 Recycling and disposal..................................... 50
Appendix ............................................................................51
A Inspection and maintenance work................... 51
B Installer level – Overview .................................. 52
C Overview of diagnostics codes........................ 54
D Status codes – Overview .................................. 59
E Overview of fault codes .................................... 60
F Check programmes – Overview ....................... 63
G Function menu – Overview ............................... 63
H Wiring diagrams................................................. 64
H.1 Wiring diagram, product for heating mode
only, 12 - 35 kW................................................... 64
H.2 Connection diagram, product for heating mode
only, ≥ 37 kW....................................................... 66
H.3 Connection diagram, product with integrated
hot water generation, 12 - 35 kW ........................ 68
H.4 Wiring diagram, product with integrated
domestic hot water generation, ≥ 37 kW ............. 70
I Commissioning Checklist................................. 72
J Commissioning Flow Chart .............................. 76
Index ...................................................................................77
0020244997_06 ecoTEC plus Installation and maintenance instructions 3
1 Safety
1.2 Qualification
1.1 Intended use
The product is intended as a heat generator
for sealed heating installations and for domestic hot water generation.
Improper use of any kind is prohibited.
Intended use also includes the following:
– use of the product only in mobile homes
that are made, transported once and permanently situated in Great Britain and Ireland. After the transportation of the mobile home to its destination the complete
product must be checked for leak-tightness
again
– validity of the product only for Great Britain
and Ireland and for the gas types in Great
Britain and Ireland as listed on the data
plate
– Installing and operating the product only
in conjunction with accessories for the
air/flue pipe which are listed in the other
applicable documents and comply with the
type of unit
– Using the product while observing the ac-
companying operating, installation and
maintenance instructions for the product
along with all other components of the installation
– Installing and setting up the product while
observing the product and system approval
– Observing all inspection and maintenance
conditions listed in the instructions
– Installing while observing the IP code
The person carrying out the work described
here must have completed professional training. The competent person must demonstrably have all of the knowledge, skills and
capabilities that are required in order to carry
out the work mentioned below.
The following work must only be carried out
by competent persons who are sufficiently
qualified to do so:
– Set-up
– Dismantling
– Installation
– Start-up
– Inspection and maintenance
– Repair
– Decommissioning
▶ Proceed in accordance with current tech-
nology.
▶ Use the correct tool.
The above-mentioned work must always only
be carried out by persons with sufficient qualifications.
This product can be used by children over
eight years old and also by persons with limited physical, sensory or mental capabilities
or insufficient experience and/or knowledge if
they are supervised or have been provided
with instructions on how to safely use the
product, and they understand the risks resulting from using the product. Children must
not play with the product. Cleaning and user
maintenance work must not be carried out by
children unless they are supervised.
The following is classed as improper use:
– Using the product in vehicles, such as mo-
bile homes or caravans. Units that are not
classed as vehicles are those that are installed in a fixed and permanent location
(known as "fixed installation").
1.3 General safety information
The following sections convey important
safety information. It is essential to read and
observe this information in order to prevent
risk of death, risk of injury, material damage
or environmental damage.
– Any direct use in industrial or commercial
processes
– Any use other than those described in
these instructions and any use that goes
beyond what is described here
1.3.1 Gas
If you smell gas:
▶ 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.
4 Installation and maintenance instructions ecoTEC plus 0020244997_06
▶ Do not use any electrical switches, mains
plugs, doorbells, telephones or other communication systems in the building.
▶ Close the emergency control valve or the
main isolator.
▶ If possible, close the gas stopcock 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.
▶ Alert the police and fire brigade, and in-
form the emergency service department of
the gas supply company as soon as you
are outside the building.
1.3.2 Flue gas
Flue gases may cause poisoning, while hot
flue gases may also cause burns. Flue gases
must therefore never be allowed to escape
uncontrollably.
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.
To prevent flue gas exit:
▶ 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.
▶ In order to operate the product, ensure that
the condensate siphon is always full.
– Water seal level for units with condens-
ate siphon (third-party accessory):
≥ 200 mm
To ensure that the combustion air supply is
sufficient during 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. This also
applies, in particular, for cupboard installations.
To prevent corrosion on the product and in
the flue system:
▶ Ensure that the combustion air supply is
free from sprays, solvents, chlorinated
cleaning agents, paint, adhesives, ammonia compounds, dust or similar substances.
▶ 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.
1.3.4 Electricity
The power supply terminals L and N remain
live.
To prevent electric shocks, proceed as follows before working on the product:
▶ Disconnect the product from the power
supply by switching off all power supplies
at all poles (electrical partition with a contact gap of at least 3 mm, e.g. fuse or circuit breaker) or remove the mains plug (if
present).
▶ Secure against being switched back on
again.
▶ Wait at least three minutes until the con-
densers have discharged.
▶ Check that there is no voltage.
To ensure that the seals are not damaged:
▶ Instead of grease, use only water or com-
mercially available soft soap to aid installation.
1.3.3 Air supply
Unsuitable or insufficient combustion and
room air may lead to material damage, but
also to life-threatening situations.
1.3.5 Weight
To prevent injuries when transporting the
product:
▶ Make sure that the product is transported
by at least two people.
To prevent material damage to the flexible
gas pipe:
▶ Never suspend the compact thermal
module on the flexible gas pipe.
0020244997_06 ecoTEC plus Installation and maintenance instructions 5
1.3.6 Explosive and flammable substances
To prevent explosions and fire:
▶ Do not use the product in storage rooms
that contain explosive or flammable substances (such as petrol, paper or paint).
are any leaks. In this case, there is a risk of
explosion.
▶ Make sure that liquid gas cannot escape
from the product or the gas pipe under any
circumstances.
1.3.7 High temperatures
To prevent burns:
▶ Only carry out work on components once
they have cooled down.
To prevent material damage that is caused
by heat transfer:
▶ Only solder connectors if the connectors
are not yet screwed to the service valves.
1.3.8 Heating water
Both unsuitable heating water and air in the
heating water may cause material damage to
the product and in the heat generator circuit.
▶ Check the quality of the heating water.
(→ Page 33)
▶ If you use non-diffusion-tight plastic pipes
in the heating installation, ensure that no
air gets into the heat generator circuit.
1.3.9 Neutralisation device
1.3.13 Risk of material damage caused by
leak detection sprays and fluids
Leak detection sprays and fluids block the
filter for the mass flow sensor on the Venturi,
thereby destroying the mass flow sensor.
▶ During repair work, do not apply any leak
detection sprays or fluids to the covering
cap on the filter for the Venturi.
1.3.14 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, directives, ordinances and laws.
To prevent contamination of the waste water:
▶ Check whether a neutralising unit must
be installed in accordance with national
regulations.
▶ Observe local regulations on neutralising
condensate.
1.3.10 Frost
To prevent material damage:
▶ Do not install the product in rooms prone
to frost.
1.3.11 Safety devices
▶ Install the necessary safety devices in the
installation.
1.3.12 Risk of death from leaks if the
product is installed below ground
level
Liquid gas accumulates at floor level. If the
product is installed below ground level, liquid
gas may accumulate at floor level if there
1.5 List of relevant standards for Great Britain and Ireland
▶ Observe the national regulations, stand-
ards, directives, ordinances and laws.
You can find a list of relevant standards at:
https://www.vaillant.co.uk/standards
6 Installation and maintenance instructions ecoTEC plus 0020244997_06
2 Guarantee and Customer Service
Thank you for installing a new Vaillant appliance in your home.
Vaillant appliances are manufactured to the very highest standard so we are pleased to offer our
customers a comprehensive guarantee.
To maintain your guarantee, the boiler must be serviced annually by a competent person who
holds the required qualifications in accordance with the rules in force of the country where the
product is installed and in accordance with the manufactures recommendations.
We recommend you complete your guarantee registration as soon as possible.
Guarantee Registration
Sales Support:
Telephone: 0345 602 0262
Technical Enquiries:
Telephone: 0344 693 3133
Email: technical@vaillant.co.uk
General Enquiries:
Telephone: 0345 602 2922
Training Enquiries:
Telephone: 0345 601 8885
Email: training.enquiriesuk@vaillant-group.com
Spares Enquiries:
Telephone: 01773 596 615
To register your Vaillant appliance visit:
https://self-service.vaillant.co.uk/warranty-registration
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.
0020244997_06 ecoTEC plus Installation and maintenance instructions 7
3 Technical data
Technical data – General
Designated country (designation in accordance
with ISO 3166)
Approved unit categories
Gas connection, boiler
side
Flow/return heating connections, boiler side
Domestic hot and cold
water connection, boiler
side
Expansion relief valve
connection pipe (min.)
Air/flue gas connection
Condensate drain pipework (min.)
G20 natural gas flow
pressure
G31 propane gas flow
pressure
Gas flow rate at 15 °C
and 1013 mbar (based
on domestic hot water
generation, if applicable),
G20
Gas flow rate at 15 °C
and 1013 mbar (based
on domestic hot water
generation, if applicable),
G31
Min. flue gas mass flow
rate (G20)
Min. flue gas mass flow
rate (G31)
Max. flue gas mass rate
Min. flue gas temperature
Max. flue gas temperature
Approved gas boiler
types
30% efficiency
NOx class
Test symbol/registration
no.
SAP 2009/2012 annual
efficiency (%)
Boiler dimension, width
Boiler dimension, height
Boiler dimension, depth
Mounting weight
VU 126/55 (H-GB)
ecoTEC plus
612
GB (Great
Britain), IE
(Ireland)
I
2H
VU 156/55 (H-GB)
ecoTEC plus
615
GB (Great
Britain), IE
(Ireland)
I
2H
VU 186/55 (H-GB)
ecoTEC plus
618
GB (Great
Britain), IE
(Ireland)
II
2H3P
VU 186/55 (P-GB)
ecoTEC plus
618
GB (Great
Britain), IE
(Ireland)
II
2H3P
VU 246/55 (H-GB)
ecoTEC plus
624
GB (Great
Britain), IE
(Ireland)
II
2H3P
VU 306/55 (H-GB)
ecoTEC plus
630
GB (Great
Britain), IE
(Ireland)
II
2H3P
15 mm 15 mm 15 mm 15 mm 15 mm 15 mm
22 mm 22 mm 22 mm 22 mm 22 mm 22 mm
– – – – – –
15 mm 15 mm 15 mm 15 mm 15 mm 15 mm
60/100 mm 60/100 mm 60/100 mm 60/100 mm 60/100 mm 60/100 mm
19 mm 19 mm 19 mm 19 mm 19 mm 19 mm
2.0 kPa
(20.0 mbar)
– – – 3.7 kPa
2.0 kPa
(20.0 mbar)
2.0 kPa
(20.0 mbar)
– 2.0 kPa
(20.0 mbar)
– –
2.0 kPa
(20.0 mbar)
(37.0 mbar)
1.3 m³/h 1.7 m³/h 2.0 m³/h – 2.6 m³/h 3.7 m³/h
– – – 1.5 kg/h – –
1.44 g/s 1.44 g/s 1.80 g/s – 2.47 g/s 2.78 g/s
– – – 2.40 g/s – –
5.6 g/s 7.0 g/s 8.4 g/s 8.4 g/s 11.1 g/s 13.9 g/s
40 ℃ 40 ℃ 40 ℃ 40 ℃ 40 ℃ 40 ℃
70 ℃ 70 ℃ 70 ℃ 70 ℃ 70 ℃ 70 ℃
C13, C33,
C43, C53
C13, C33,
C43, C53
C13, C33,
C43, C53
C13, C33,
C43, C53
C13, C33,
C43, C53
C13, C33,
C43, C53
109.3 % 109.3 % 109.6 % 108.5 % 109.5 % 109.4 %
6 6 6 6 6 6
CE‑
0085CM0320
CE‑
0085CM0320
CE‑
0085CM0320
CE‑
0085CM0320
CE‑
0085CM0320
CE‑
0085CM0320
89.3 % 89.2 % 89.6 % 89.6 % 89.6 % 89.5 %
440 mm 440 mm 440 mm 440 mm 440 mm 440 mm
720 mm 720 mm 720 mm 720 mm 720 mm 720 mm
338 mm 338 mm 338 mm 338 mm 338 mm 372 mm
36 kg 36 kg 36 kg 36 kg 37 kg 38 kg
8 Installation and maintenance instructions ecoTEC plus 0020244997_06
Designated country (designation in accordance
with ISO 3166)
Approved unit categories
Gas connection, boiler
side
Flow/return heating connections, boiler side
Domestic hot and cold
water connection, boiler
side
Expansion relief valve
connection pipe (min.)
Air/flue gas connection
Condensate drain pipework (min.)
G20 natural gas flow
pressure
G31 propane gas flow
pressure
Gas flow rate at 15 °C
and 1013 mbar (based
on domestic hot water
generation, if applicable),
G20
Gas flow rate at 15 °C
and 1013 mbar (based
on domestic hot water
generation, if applicable),
G31
Min. flue gas mass flow
rate (G20)
Min. flue gas mass flow
rate (G31)
Max. flue gas mass rate
Min. flue gas temperature
Max. flue gas temperature
Approved gas boiler
types
30% efficiency
NOx class
Test symbol/registration
no.
SAP 2009/2012 annual
efficiency (%)
Boiler dimension, width
Boiler dimension, height
Boiler dimension, depth
Mounting weight
VU 306/55 (P-GB)
ecoTEC plus
630
GB (Great
Britain), IE
(Ireland)
II
2H3P
VU 386/55 (H-GB)
ecoTEC plus
637
GB (Great
Britain), IE
(Ireland)
II
2H3P
VUW 196/55 (H-GB)
ecoTEC plus
825
GB (Great
Britain), IE
(Ireland)
II
2H3P
VUW 246/55 (H-GB)
ecoTEC plus
832
GB (Great
Britain), IE
(Ireland)
II
2H3P
VUW 246/55 (P-GB)
ecoTEC plus
832
GB (Great
Britain), IE
(Ireland)
II
2H3P
VUW 306/55 (H-GB)
ecoTEC plus
835
GB (Great
Britain), IE
(Ireland)
II
2H3P
15 mm 15 mm 15 mm 15 mm 15 mm 15 mm
22 mm 22 mm 22 mm 22 mm 22 mm 22 mm
– – G 3/4″ G 3/4″ G 3/4″ G 3/4″
15 mm 15 mm 15 mm 15 mm 15 mm 15 mm
60/100 mm 60/100 mm 60/100 mm 60/100 mm 60/100 mm 60/100 mm
19 mm 19 mm 19 mm 19 mm 19 mm 19 mm
– 2.0 kPa
(20.0 mbar)
3.7 kPa
– – – 3.7 kPa
(37.0 mbar)
2.0 kPa
(20.0 mbar)
2.0 kPa
(20.0 mbar)
– 2.0 kPa
(20.0 mbar)
–
(37.0 mbar)
– 4.1 m³/h 2.7 m³/h 3.4 m³/h – 3.8 m³/h
2.4 kg/h – – – 2.5 kg/h –
– 3.05 g/s 1.80 g/s 2.47 g/s – 2.78 g/s
4.08 g/s – – – 2.90 g/s –
13.9 g/s 17.4 g/s 8.4 g/s 11.1 g/s 11.1 g/s 16.2 g/s
40 ℃ 40 ℃ 40 ℃ 40 ℃ 40 ℃ 40 ℃
70 ℃ 70 ℃ 70 ℃ 70 ℃ 70 ℃ 70 ℃
C13, C33,
C43, C53
C13, C33,
C43, C53
C13, C33,
C43, C53
C13, C33,
C43, C53
C13, C33,
C43, C53
C13, C33,
C43, C53
108 % 109.3 % 109.6 % 109.5 % 108 % 109.4 %
6 6 6 6 6 6
CE‑
0085CM0320
CE‑
0085CM0320
CE‑
0085CM0320
CE‑
0085CM0320
CE‑
0085CM0320
CE‑
0085CM0320
89.7 % 89.5 % 89.5 % 89.5 % 89.5 % 89.4 %
440 mm 440 mm 440 mm 440 mm 440 mm 440 mm
720 mm 720 mm 720 mm 720 mm 720 mm 720 mm
372 mm 406 mm 338 mm 338 mm 338 mm 372 mm
38 kg 43 kg 36 kg 37 kg 37 kg 41 kg
VUW 286/55 (H-GB)
ecoTEC plus
838
Designated country (designation in accordance
with ISO 3166)
Approved unit categories
GB (Great
Britain), IE
(Ireland)
II
2H3P
0020244997_06 ecoTEC plus Installation and maintenance instructions 9
Gas connection, boiler
side
Flow/return heating connections, boiler side
Domestic hot and cold
water connection, boiler
side
Expansion relief valve
connection pipe (min.)
Air/flue gas connection
Condensate drain pipework (min.)
G20 natural gas flow
pressure
G31 propane gas flow
pressure
Gas flow rate at 15 °C
and 1013 mbar (based
on domestic hot water
generation, if applicable),
G20
Gas flow rate at 15 °C
and 1013 mbar (based
on domestic hot water
generation, if applicable),
G31
Min. flue gas mass flow
rate (G20)
Min. flue gas mass flow
rate (G31)
Max. flue gas mass rate
Min. flue gas temperature
Max. flue gas temperature
Approved gas boiler
types
30% efficiency
NOx class
Test symbol/registration
no.
SAP 2009/2012 annual
efficiency (%)
Boiler dimension, width
Boiler dimension, height
Boiler dimension, depth
Mounting weight
VUW 286/55 (H-GB)
ecoTEC plus
838
15 mm
22 mm
G 3/4″
15 mm
60/100 mm
19 mm
2.0 kPa
(20.0 mbar)
–
4.2 m³/h
–
3.05 g/s
–
17.9 g/s
40 ℃
70 ℃
C13, C33,
C43, C53
109.4 %
6
CE‑
0085CM0320
89.4 %
440 mm
720 mm
406 mm
44 kg
Technical data – G20 power/loading G20
Nominal heat output
range P at 50/30 °C
Nominal heat output
range P at 80/60 °C
Maximum heat output
for domestic hot water
generation
VU 126/55 (H-GB)
ecoTEC plus
612
3.3 to 13.2 kW 3.3 to 16.7 kW 4.1 to 20.0 kW 5.7 to 26.4 kW 6.4 to 32.8 kW 7.1 to 40.5 kW
3.0 to 12.2 kW 3.0 to 15.2 kW 3.8 to 18.2 kW 5.2 to 24.4 kW 5.8 to 30.4 kW 6.4 to 37.6 kW
12.2 kW 15.2 kW 18.2 kW 24.4 kW 30.4 kW 37.6 kW
VU 156/55 (H-GB)
ecoTEC plus
615
VU 186/55 (H-GB)
ecoTEC plus
618
VU 246/55 (H-GB)
ecoTEC plus
624
VU 306/55 (H-GB)
ecoTEC plus
630
VU 386/55 (H-GB)
ecoTEC plus
637
10 Installation and maintenance instructions ecoTEC plus 0020244997_06
Maximum heat input for
domestic hot water generation
Maximum heat input,
heating side
Minimum heat input
Heating adjustment range
Nominal heat input efficiency (stationary) at
40/30 °C
Nominal heat input efficiency (stationary) at
50/30 °C
Nominal heat input efficiency (stationary) at
60/40 °C
Nominal heat input efficiency (stationary) at
80/60 °C
VU 126/55 (H-GB)
ecoTEC plus
612
12.4 kW 15.5 kW 18.9 kW 24.7 kW 30.9 kW 38.1 kW
12.4 kW 15.5 kW 18.6 kW 24.7 kW 30.9 kW 38.1 kW
3.2 kW 3.2 kW 4.0 kW 5.5 kW 6.2 kW 6.8 kW
3 to 12 kW 3 to 15 kW 4 to 19 kW 5 to 24 kW 6 to 30 kW 6 to 38 kW
108.0 % 109.0 % 109.0 % 108.0 % 107.0 % 107.0 %
106.0 % 108.0 % 108.0 % 107.0 % 106.0 % 106.0 %
101.0 % 101.0 % 101.0 % 101.0 % 101.0 % 101.0 %
99 % 98.0 % 98.0 % 98.0 % 98.0 % 98.0 %
VU 156/55 (H-GB)
ecoTEC plus
615
VU 186/55 (H-GB)
ecoTEC plus
618
VU 246/55 (H-GB)
ecoTEC plus
624
VU 306/55 (H-GB)
ecoTEC plus
630
VU 386/55 (H-GB)
ecoTEC plus
637
Nominal heat output
range P at 50/30 °C
Nominal heat output
range P at 80/60 °C
Maximum heat output
for domestic hot water
generation
Maximum heat input for
domestic hot water generation
Maximum heat input,
heating side
Minimum heat input
Heating adjustment range
Nominal heat input efficiency (stationary) at
40/30 °C
Nominal heat input efficiency (stationary) at
50/30 °C
Nominal heat input efficiency (stationary) at
60/40 °C
Nominal heat input efficiency (stationary) at
80/60 °C
VUW 196/55 (H-GB)
ecoTEC plus
825
4.1 to 20.8 kW 5.7 to 26.4 kW 6.4 to 32.8 kW 7.1 to 30.9 kW
3.8 to 19.3 kW 5.2 to 24.4 kW 5.8 to 30.4 kW 6.5 to 28.6 kW
24.4 kW 31.8 kW 34.0 kW 38.7 kW
24.7 kW 32.2 kW 34.7 kW 39.2 kW
19.6 kW 24.7 kW 30.9 kW 28.9 kW
4.0 kW 5.5 kW 6.2 kW 6.8 kW
4 to 19 kW 5 to 24 kW 6 to 30 kW 6 to 29 kW
108.0 % 108.0 % 107.0 % 107.0 %
106.0 % 107.0 % 106.0 % 107.0 %
101.0 % 101.0 % 101.0 % 101.0 %
98.0 % 98.0 % 98.0 % 98.0 %
VUW 246/55 (H-GB)
ecoTEC plus
832
VUW 306/55 (H-GB)
ecoTEC plus
835
VUW 286/55 (H-GB)
ecoTEC plus
838
Technical data – Power/loading G31
VU 186/55 (P-GB)
ecoTEC plus
618
Nominal heat output
range P at 50/30 °C
Nominal heat output
range P at 80/60 °C
Maximum heat output
for domestic hot water
generation
0020244997_06 ecoTEC plus Installation and maintenance instructions 11
5.4 to 19.4 kW 9.4 to 31.9 kW 6.5 to 25.5 kW
5.0 to 18.2 kW 8.5 to 30.4 kW 6.0 to 24.4 kW
18.3 kW 30.4 kW 31.8 kW
VU 306/55 (P-GB)
ecoTEC plus
630
VUW 246/55 (P-GB)
ecoTEC plus
832
Maximum heat input for
domestic hot water generation
Maximum heat input,
heating side
Minimum heat input
Nominal heat input efficiency (stationary) at
40/30 °C
Nominal heat input efficiency (stationary) at
50/30 °C
Nominal heat input efficiency (stationary) at
60/40 °C
Nominal heat input efficiency (stationary) at
80/60 °C
Technical data – Heating
Maximum flow temperature
Max. flow temperature
adjustment range (default
setting: 75 °C)
Permissible total excess
pressure
Minimum pressure for
full operation
Expansion vessel capacity
Circulation water volume
(with reference to
ΔT= 20 K)
Approx. condensate rate
(pH value 3.5 to 4.0) in
50/30 °C heating mode
Remaining feed head of
pump (at nominal circulation water volume)
VU 186/55 (P-GB)
ecoTEC plus
618
18.6 kW 30.9 kW 32.2 kW
18.6 kW 30.9 kW 24.7 kW
5.3 kW 9.0 kW 6.4 kW
104.0 % 104.0 % 104.0 %
104.0 % 103.0 % 103.0 %
101.0 % 101.0 % 101.0 %
98.0 % 98.0 % 98.0 %
VU 126/55 (H-GB)
ecoTEC plus
612
85 ℃ 85 ℃ 85 ℃ 85 ℃ 85 ℃ 85 ℃
30 to 80 ℃ 30 to 80 ℃ 30 to 80 ℃ 30 to 80 ℃ 30 to 80 ℃ 30 to 80 ℃
0.25 MPa
(2.50 bar)
0.08 MPa
(0.80 bar)
10 l 10 l 10 l 10 l 10 l 10 l
525 l/h 662 l/h 796 l/h 796 l/h 1,049 l/h 1,307 l/h
1.2 l/h 1.6 l/h 1.9 l/h 1.9 l/h 2.5 l/h 3.1 l/h
0.025 MPa
(0.250 bar)
VU 306/55 (P-GB)
ecoTEC plus
630
VU 156/55 (H-GB)
ecoTEC plus
615
0.25 MPa
(2.50 bar)
0.08 MPa
(0.80 bar)
0.025 MPa
(0.250 bar)
VUW 246/55 (P-GB)
ecoTEC plus
832
VU 186/55 (H-GB)
ecoTEC plus
618
0.25 MPa
(2.50 bar)
0.08 MPa
(0.80 bar)
0.025 MPa
(0.250 bar)
VU 186/55 (P-GB)
ecoTEC plus
618
0.25 MPa
(2.50 bar)
0.08 MPa
(0.80 bar)
0.025 MPa
(0.250 bar)
VU 246/55 (H-GB)
ecoTEC plus
624
0.25 MPa
(2.50 bar)
0.08 MPa
(0.80 bar)
0.025 MPa
(0.250 bar)
VU 306/55 (H-GB)
ecoTEC plus
630
0.25 MPa
(2.50 bar)
0.08 MPa
(0.80 bar)
0.025 MPa
(0.250 bar)
Maximum flow temperature
Max. flow temperature
adjustment range (default
setting: 75 °C)
Permissible total excess
pressure
Minimum pressure for
full operation
Expansion vessel capacity
VU 306/55 (P-GB)
ecoTEC plus
630
85 ℃ 85 ℃ 85 ℃ 85 ℃ 85 ℃ 85 ℃
30 to 80 ℃ 30 to 80 ℃ 30 to 80 ℃ 30 to 80 ℃ 30 to 80 ℃ 30 to 80 ℃
0.25 MPa
(2.50 bar)
0.08 MPa
(0.80 bar)
10 l 10 l 10 l 10 l 10 l 10 l
VU 386/55 (H-GB)
ecoTEC plus
637
0.25 MPa
(2.50 bar)
0.08 MPa
(0.80 bar)
VUW 196/55 (H-GB)
ecoTEC plus
825
0.25 MPa
(2.50 bar)
0.08 MPa
(0.80 bar)
VUW 246/55 (H-GB)
ecoTEC plus
832
0.25 MPa
(2.50 bar)
0.08 MPa
(0.80 bar)
VUW 246/55 (P-GB)
ecoTEC plus
832
0.25 MPa
(2.50 bar)
0.08 MPa
(0.80 bar)
VUW 306/55 (H-GB)
ecoTEC plus
835
0.25 MPa
(2.50 bar)
0.08 MPa
(0.80 bar)
12 Installation and maintenance instructions ecoTEC plus 0020244997_06
Circulation water volume
(with reference to
ΔT= 20 K)
Approx. condensate rate
(pH value 3.5 to 4.0) in
50/30 °C heating mode
Remaining feed head of
pump (at nominal circulation water volume)
Maximum flow temperature
Max. flow temperature
adjustment range (default
setting: 75 °C)
Permissible total excess
pressure
Minimum pressure for
full operation
Expansion vessel capacity
Circulation water volume
(with reference to
ΔT= 20 K)
Approx. condensate rate
(pH value 3.5 to 4.0) in
50/30 °C heating mode
Remaining feed head of
pump (at nominal circulation water volume)
VU 306/55 (P-GB)
ecoTEC plus
630
1,307 l/h 1,617 l/h 830 l/h 1,049 l/h 1,049 l/h 1,307 l/h
3.1 l/h 3.8 l/h 2.0 l/h 2.5 l/h 2.5 l/h 3.1 l/h
0.025 MPa
(0.250 bar)
VUW 286/55 (H-GB)
ecoTEC plus
838
85 ℃
30 to 80 ℃
0.25 MPa
(2.50 bar)
0.08 MPa
(0.80 bar)
10 l
1,230 l/h
2.9 l/h
0.025 MPa
(0.250 bar)
VU 386/55 (H-GB)
ecoTEC plus
637
0.025 MPa
(0.250 bar)
VUW 196/55 (H-GB)
ecoTEC plus
825
0.025 MPa
(0.250 bar)
VUW 246/55 (H-GB)
ecoTEC plus
832
0.025 MPa
(0.250 bar)
VUW 246/55 (P-GB)
ecoTEC plus
832
0.025 MPa
(0.250 bar)
VUW 306/55 (H-GB)
ecoTEC plus
835
0.025 MPa
(0.250 bar)
Technical data – Hot water handling mode
Lowest water volume
Water volume (at
ΔT = 30 K)
Water volume (at
ΔT = 35 K)
Water volume (at
ΔT = 42 K)
Permitted overpressure
Required connection
pressure
Hot water output temperature range
VUW 196/55 (H-GB)
ecoTEC plus
825
2.0 l/min 2.0 l/min 2.0 l/min 2.0 l/min 2.0 l/min
12.3 l/min 15.2 l/min 15.2 l/min 16.7 l/min 18.5 l/min
10.5 l/min 13.0 l/min 13.0 l/min 14.3 l/min 15.9 l/min
8.8 l/min 10.9 l/min 10.9 l/min 11.9 l/min 13.2 l/min
1.0 MPa
(10.0 bar)
0.035 MPa
(0.350 bar)
35 to 65 ℃ 35 to 65 ℃ 35 to 65 ℃ 35 to 65 ℃ 35 to 65 ℃
VUW 246/55 (H-GB)
ecoTEC plus
832
1.0 MPa
(10.0 bar)
0.035 MPa
(0.350 bar)
Technical data – Electrics
Electric connection
Permissible connected
voltage
VU 126/55 (H-GB)
ecoTEC plus
612
230 V/50 Hz 230 V/50 Hz 230 V/50 Hz 230 V/50 Hz 230 V/50 Hz 230 V/50 Hz
190 to 253 V 190 to 253 V 190 to 253 V 190 to 253 V 190 to 253 V 190 to 253 V
VU 156/55 (H-GB)
ecoTEC plus
615
VUW 246/55 (P-GB)
ecoTEC plus
832
1.0 MPa
(10.0 bar)
0.035 MPa
(0.350 bar)
VU 186/55 (H-GB)
ecoTEC plus
618
VUW 306/55 (H-GB)
ecoTEC plus
835
1.0 MPa
(10.0 bar)
0.035 MPa
(0.350 bar)
VU 186/55 (P-GB)
ecoTEC plus
618
VUW 286/55 (H-GB)
ecoTEC plus
838
1.0 MPa
(10.0 bar)
0.035 MPa
(0.350 bar)
VU 246/55 (H-GB)
ecoTEC plus
624
VU 306/55 (H-GB)
ecoTEC plus
630
0020244997_06 ecoTEC plus Installation and maintenance instructions 13
Built-in fuse (slow-blow)
Min. electrical power consumption
Max. electrical power
consumption
Electrical power consumption, standby
Level of protection
VU 126/55 (H-GB)
ecoTEC plus
612
2 A 2 A 2 A 2 A 2 A 2 A
35 W 35 W 35 W 35 W 35 W 45 W
55 W 60 W 65 W 65 W 70 W 90 W
< 2 W < 2 W < 2 W < 2 W < 2 W < 2 W
IP X4 D IP X4 D IP X4 D IP X4 D IP X4 D IP X4 D
VU 156/55 (H-GB)
ecoTEC plus
615
VU 186/55 (H-GB)
ecoTEC plus
618
VU 186/55 (P-GB)
ecoTEC plus
618
VU 246/55 (H-GB)
ecoTEC plus
624
VU 306/55 (H-GB)
ecoTEC plus
630
Electric connection
Permissible connected
voltage
Built-in fuse (slow-blow)
Min. electrical power consumption
Max. electrical power
consumption
Electrical power consumption, standby
Level of protection
Electric connection
Permissible connected
voltage
Built-in fuse (slow-blow)
Min. electrical power consumption
Max. electrical power
consumption
Electrical power consumption, standby
Level of protection
VU 306/55 (P-GB)
ecoTEC plus
630
230 V/50 Hz 230 V/50 Hz 230 V/50 Hz 230 V/50 Hz 230 V/50 Hz 230 V/50 Hz
190 to 253 V 190 to 253 V 190 to 253 V 190 to 253 V 190 to 253 V 190 to 253 V
2 A 2 A 2 A 2 A 2 A 2 A
45 W 55 W 35 W 35 W 35 W 45 W
80 W 95 W 80 W 85 W 85 W 90 W
< 2 W < 3 W < 2 W < 2 W < 2 W < 2 W
IP X4 D IP X4 D IP X4 D IP X4 D IP X4 D IP X4 D
VUW 286/55 (H-GB)
ecoTEC plus
838
230 V/50 Hz
190 to 253 V
2 A
55 W
120 W
< 3 W
IP X4 D
VU 386/55 (H-GB)
ecoTEC plus
637
VUW 196/55 (H-GB)
ecoTEC plus
825
VUW 246/55 (H-GB)
ecoTEC plus
832
VUW 246/55 (P-GB)
ecoTEC plus
832
VUW 306/55 (H-GB)
ecoTEC plus
835
14 Installation and maintenance instructions ecoTEC plus 0020244997_06
4 Notes on the documentation
▶ Always observe all operating instructions enclosed with
the installation components.
▶ Store these instructions and all other applicable docu-
ments for further use.
These instructions apply only to:
Product article number
VU 126/5-5 (H-GB)
ecoTEC plus 612
VU 156/5-5 (H-GB)
ecoTEC plus 615
VU 186/5-5 (H-GB)
ecoTEC plus 618
VU 186/5-5 (P-GB)
ecoTEC plus 618
VU 246/5-5 (H-GB)
ecoTEC plus 624
VU 306/5-5 (H-GB)
ecoTEC plus 630
VU 306/5-5 (P-GB)
ecoTEC plus 630
VU 386/5-5 (H-GB)
ecoTEC plus 637
VUW 196/5-5 (H-GB)
ecoTEC plus 825
VUW 246/5-5 (H-GB)
ecoTEC plus 832
VUW 246/5-5 (P-GB)
ecoTEC plus 832
VUW 286/5-5 (H-GB)
ecoTEC plus 838
VUW 306/5-5 (H-GB)
ecoTEC plus 835
Article number
0010021828 41-694-20
0010021829 41-694-21
0010021830 41-694-22
0010021831 41-694-23
0010021832 41-694-24
0010021833 41-694-25
0010021834 41-694-26
0010021835 41-694-27
0010021823 47-044-83
0010021824 47-044-84
0010021825 47-044-85
0010021826 47-044-86
0010021822 47-044-82
Gas Council
Number
5.2 Energy Saving Trust Endorsed Products
Only the most energy efficient products can carry the
‘Energy Saving Trust Endorsed Product’ brandmark making
it easy for consumers to choose products that have met strict
energy performance criteria.
Available for: Boilers, Heating controls and chemical inhibitors, the Energy Saving Trust endorsed product brandmark
gives consumers confidence that a product will cost less to
run, help lower energy bills and reduce carbon emissions.
About the Energy Saving Trust
Energy Saving Trust is an independent and impartial organisation that provides trusted energy saving advice to empower millions of people to lead affordable, low energy lifestyles. For more information visit energysavingtrust.org.uk
5.3 Hot Water Association
Vaillant is a full member of the Hot Water Association and
promotes the scheme in association with its cylinder range.
Details are available on the web site www.vaillant.co.uk
5.4 Information on the identification plate
The identification plate is mounted on the underside of the
product in the factory.
Information on the
identification plate
Meaning
5 Product description
5.1 CE marking
The CE marking shows that the products comply with the
basic requirements of the applicable directives as stated on
the data plate.
The declaration of conformity can be viewed at the manufacturer's site.
Read the instructions.
VU… Vaillant gas-fired wall-hung boiler for
VUW…, VUI… Vaillant gas-fired wall-hung boiler for
..6/5-5 Calorific value power/product generation
ecoTEC plus Product designation
2H, G20 – 20 mbar
(2.0 kPa)
ww/yyyy Date of manufacture: Week/year
Cat. Approved gas boiler category
Types Approved units of type
PMS Permissible total overpressure in heating
PMW Permissible total overpressure during hot
T
max.
ED 92/42 Current efficiency directive fulfilled with
V Hz Mains voltage and mains frequency
W Max. electrical power consumption
IP Level of protection
heating
heating and hot water generation
equipment
Gas group and gas connection pressure
as set at the factory
mode
water generation
Max. flow temperature
4* rating
0020244997_06 ecoTEC plus Installation and maintenance instructions 15
Information on the
7
8
9
10
13
11
12
14
15
18
5
4
1
2
3
16
17
6
7
8
9
10
13
11
12
14
18
19
17
5
4
1
2
3
20
15
16
6
identification plate
P Nominal heat output range
Q Heat input range
D Nominal hot water draw-off rate
Meaning
Heating mode
Hot water generation
Bar code with serial number,
7th to 16th digit = product article number
Note
Make absolutely sure that the product is compatible with the gas group at the installation site.
5.5 Serial number
The serial number can be found on a plastic label behind the
front flap and on the identification plate.
Note
The serial number can also be shown on the
display of the product (→ Operating instructions).
9 Compact thermal
module
10 Ignition electrode
11 Fan
12 Automatic air vent
13 Manometer
14 Internal pump
15 Bypass valve
16 Expansion relief valve
17 Prioritising diverter
valve
18 Electronics box
5.6.2 Functional elements, product with domestic hot water generation
5.6 Product design
5.6.1 Functional elements, product for heating mode only
1 Gas valve assembly
2 Water pressure sensor
3 Venturi with mass flow
sensor
4 Heat exchanger
5 Connection for the
air/flue pipe
6 Flue gas test point
7 Expansion vessel
8 Air intake pipe
9 Compact thermal
module
10 Ignition electrode
11 Fan
12 Automatic air vent
13 Manometer
14 Internal pump
15 Bypass valve
16 Expansion relief valve
17 Electronics box
18 Prioritising diverter
valve
19 Impeller sensor (do-
mestic hot water)
20 Secondary heat ex-
changer
1 Gas valve assembly
2 Water pressure sensor
3 Venturi with mass flow
sensor
4 Heat exchanger
5 Connection for the
6 Flue gas test point
7 Expansion vessel
8 Air intake pipe
16 Installation and maintenance instructions ecoTEC plus 0020244997_06
air/flue pipe
5.7 Safety Devices
5.7.1 Electrical Supply Failure
The boiler will not work without an electrical supply. Normal
operation of the boiler should resume when the electrical
supply is restored.
Reset any external controls, to resume normal operation of
the central heating.
If the boiler does not resume normal operation press the
reset button. If the boiler does not resume normal operation
after this call your Installation/Servicing company or Vaillant
service.
5.7.2 Overheating Safety
The boiler software is designed to recognise the potential for
an overheat lockout and will shutdown before this happens.
To restart the boiler, press the reset button on the boiler
interface.
If the boiler fails to resume normal operation and all external
controls are calling for heat, then call your Installation/ Servicing company or Vaillant service.
5.7.3 Frost protection
The appliance has a built in frost protection device that protects the boiler from freezing. With the gas and electric supplies ON and irrespective of any room thermostat setting, the
frost protection device will operate the pump when the temperature of the boiler water falls below 12 °C.
A timer is used so that the temperature can be checked periodically. After 10 minutes the pump will be stopped if the
temperature is higher than 10 °C or has already reached
35 °C. The burner will activate if the boiler temperature does
not reach 10 °C after 30 minutes or at any time if the temperature drops to 5 °C.
The burner will switch off when the temperature reaches
35 °C.
5.7.4 Condensate Drain Blockage
As a safety feature the boiler will stop working if the condensate drain becomes blocked. During freezing conditions
this may be due to the forming of ice in the condense drain
external to the house. Release an ice blockage by the use
of warm cloths on the pipe. After pressing reset the boiler
should restart.
0020244997_06 ecoTEC plus Installation and maintenance instructions 17
6 Set-up
720
20
624
160
125
188
100 100
3535
440
A
B
180
125
2
1
3
5
7
9
8
4*
6*
6*
4*
7
11 10
3
5
12
6.1 Checking the scope of delivery
▶ Check that the scope of delivery is complete and intact.
6.1.1 Scope of delivery
Validity: Product with heating mode only
6.2 Dimensions
Number
1
1 Installation set containing the following:
1
1
1
2 - Heating flow/return connection pipe
3 - Service valve
3
1 Lower cover
1
1
1 Enclosed documentation
Designation
Heat generator
- Unit mounting bracket
- Expansion relief valve connection pipe
- Gas connection pipe
- Bag with small parts
Mounting template
Condensate discharge hose
6.1.2 Scope of delivery
Validity: Product with integrated hot water generation
Number
1
1 Installation set containing the following:
1
1
1
2 - Heating flow/return connection pipe
2 - Cold water, domestic hot water connection pipe
4 - Service valve
3
1 Lower cover
1
1
1 Enclosed documentation
Designation
Heat generator
- Unit mounting bracket
- Expansion relief valve connection pipe
- Gas connection pipe
- Bag with small parts
Mounting template
Condensate discharge hose
1 Air/flue pipe wall duct
2 Unit mounting bracket
3 Heating flow (22 × 1.5
diameter)
4 Domestic hot water
connection (15 × 1.5
diameter)
5 Gas connection
(15 × 1.5 diameter)
6 Cold water connection
(15 × 1.5 diameter)
7 Heating return (22 × 1.5
diameter)
8 R1 tundish/condensate
trap connection
9 Air/flue pipe connection
10 Condensate discharge
connection, 19 mm
diameter
11 Condensate trap
12 Drain pipework connec-
tion, expansion relief
valve, heating, 15 mm
diameter
* Only products with
integrated domestic
hot water generation
** Only products with
heating mode only
18 Installation and maintenance instructions ecoTEC plus 0020244997_06
Consult the installation template that is supplied to find the
B A
C C D
Minimum fall
44 mm/m
dimension A.
Installation depth, dimension B
VU 126/5-5 (H-GB) ecoTEC plus 612
VU 156/5-5 (H-GB) ecoTEC plus 615
VU 186/5-5 (H-GB) ecoTEC plus 618
VU 186/5-5 (P-GB) ecoTEC plus 618
VU 246/5-5 (H-GB) ecoTEC plus 624
VU 306/5-5 (H-GB) ecoTEC plus 630
VU 306/5-5 (P-GB) ecoTEC plus 630
VU 386/5-5 (H-GB) ecoTEC plus 637
VUW 196/5-5 (H-GB) ecoTEC plus 825
VUW 246/5-5 (H-GB) ecoTEC plus 832
VUW 246/5-5 (P-GB) ecoTEC plus 832
VUW 306/5-5 (H-GB) ecoTEC plus 835
VUW 286/5-5 (H-GB) ecoTEC plus 838
6.3 Installation site
This boiler is not suitable for outdoor installation. This boiler
may be installed in any room. However if the boiler is being
installed in a room containing a bath or shower it must only
be installed in zones 2 or 3. In GB this is the current I.E.E.
WIRING REGULATIONS and BUILDING REGULATIONS. In
IE reference should be made to the current edition of I.S.813
“Domestic Gas Installations” and the current ETCI rules.
If the boiler is to be installed in a timber frame building it
should be fitted in accordance with the current version of the
Institute of Gas Engineers document IGE/UP/7. If in doubt
seek advice from local gas undertaking or the manufacturer.
6.4 Minimum clearances
Minimum clearance
A 165 mm: Air/flue pipe, 60/100 mm diameter
275 mm: Air/flue pipe, 80/125 mm diameter
B 180 mm; optimum approx. 250 mm
C 5 mm; optimum approx. 50 mm
D 500 mm in front of the heat generator to enable
easy access for maintenance work (may be
provided by an opening door).
338 mm
338 mm
338 mm
338 mm
338 mm
372 mm
372 mm
406 mm
338 mm
338 mm
338 mm
372 mm
406 mm
It is not necessary to maintain a clearance between the
product and components made of combustible materials that
go beyond the minimum clearances.
6.5 Compartment Ventilation
The boilers are very high efficiency appliances.
As a consequence the heat loss from the appliance casing
during operation is very low.
Compartment ventilation is not required as the products are
only certified, and can only be fitted with a concentric flue
system.
6.6 Air/flue pipe
6.6.1 Regulation
Different flue outlet configurations can be carried out.
– Consult the installation manual for air/flue gas systems
for more information about the other possibilities and
associated accessories.
– Standard flue terminal kits have an in-built fall back to
the boiler to drain the condensate. These can be fitted
level between the appliance and the termination position.
All other extended flues must have a fall of at least 44
mm/m.
The maximum length of the flue outlet is defined according to
its type (for example C13).
– Whatever the kind of flue system chosen, observe the
minimum distances to position the flue terminals.
– To install the flue, refer to the separate flue instruction
supplied with your appliance.
– Explain these requirements to the user of the appliance.
In GB the minimum acceptable siting dimensions for the
terminal from obstructions, other terminals and ventilation
openings are shown in diagram overleaf.
In IE the minimum distances for flue terminal positioning
must be those detailed in I.S. 813 “Domestic Gas Installations”.
The terminal must be exposed to the external air, allowing
free passage of air across it at all times.
Being a condensing boiler some pluming may occur from
the flue outlet. This should be taken into consideration when
selecting the position for the terminal.
0020244997_06 ecoTEC plus Installation and maintenance instructions 19
6.6.2 Position of the air/flue terminal
J
J
N
Q
S
S
P
U
B
Boundary
G
D
J
J
R
V
M
T
G
C
W
E
F
L
A
K
S
P
S
F
X
A
Y
Boundary
Z
H
Aa
S
Z
Ba
6.6.2.1 Positioning the terminal of a fan-supported flue system
Installation site Dimensions
A
Adjacent to a boundary. 300 mm
The dimension below eaves, balconies and car ports can be reduced to this value, as long as the flue terminal is
1)
B
extended to clear any overhang. External flue joints must be sealed with a suitable silicon sealant.
C Between a vertical flue terminal and a window or dormer window on a roof. 1,500 mm
D Between terminals facing each other. 1,200 mm
E Vertical flue clearance, adjacent to a boundary line. 300 mm
Distance to a boundary line, unless it will cause a nuisance. BS 5440:Part 1 recommends that care is taken
2)
F
when siting terminal in relation to boundary lines.
G Minimum clearance from a skylight to a vertical flue or to another vertical flue. Min. 300 mm
Vertical flue clearance, to noncombustible building material.
H
Vertical flue clearance to combustible building material.
J Above, below and either side of an opening door, air vent or opening window. 300 mm
K Diagonally to an opening door, air vent or opening window. 600 mm
2)
To an internal or external corner. 200 mm
L
Below a Velux window.
M
Above or to either side of the Velux window.
From a pitched roof.
N
In regions with heavy snowfall.
P From vertical drain pipes and soil pipes. 25 mm
Below eaves.
Q
Below gutters, pipe and drains.
1) There should be no ventilation/opening in the eaves within 300 mm distance of the terminal.
2) These dimensions comply with the building regulations, but they may need to be increased to avoid wall
staining and nuisance from pluming depending on site conditions.
– Terminals must be positioned so to avoid combustion products entering the building.
– Support the flue at approximately one metre intervals and at a change of direction, use suitable brackets and
– Installations in car ports are not recommended.
– The flue cannot be lower than 1 metre from the top of a lightwell due to the build up of combustion products.
– Dimensions from a flue terminal to a fanned air inlet to be determined by the ventilation equipment.
fixings.
25 mm
600 mm
500 mm
1,500 mm
2,000 mm
600 mm
400 mm
500 mm
200 mm
75 mm
20 Installation and maintenance instructions ecoTEC plus 0020244997_06
Installation site Dimensions
Balcony/eaves
Gutter
Adequately secured
air/flue gas pipe
The flue pipe must
protrude beyond any overhang
The dimension below eaves, balconies and car ports can be reduced to this value, as long as the flue terminal is
R
extended to clear any overhang. External flue joints must be sealed with suitable silicon sealant.
S Above adjacent ground or balcony. 300 mm
2)
Distance to a surface facing a terminal, unless it will cause a nuisance. BS 5440: Part 1 recommends that care
T
is taken when siting terminals in relation to surfaces facing a terminal.
U Clearance alongside another terminal. 300 mm
V Above roof level. 300 mm
W Minimum to vertical structure on roof, roof vent. Min. 300 mm
X Minimum to opening in adjacent building. Min.
Y Minimum at an angle to a boundary which is not less than 300 mm to the terminal Min. 600 mm
Z Minimum measured to the nearest corner of the OPEN window Min. 600 mm
Aa No more than this value above ridge. Max.
Ba Not less than this value below the opening window Min. 300 mm
1) There should be no ventilation/opening in the eaves within 300 mm distance of the terminal.
2) These dimensions comply with the building regulations, but they may need to be increased to avoid wall
staining and nuisance from pluming depending on site conditions.
– Terminals must be positioned so to avoid combustion products entering the building.
– Support the flue at approximately one metre intervals and at a change of direction, use suitable brackets and
fixings.
– Installations in car ports are not recommended.
– The flue cannot be lower than 1 metre from the top of a lightwell due to the build up of combustion products.
– Dimensions from a flue terminal to a fanned air inlet to be determined by the ventilation equipment.
25 mm
600 mm
2000 mm
300 mm
6.6.2.2 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.
Dimensions B and R:
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.
You can use a plume management kit to enable the termination point to be positioned and directed away from the building
fabric.
0020244997_06 ecoTEC plus Installation and maintenance instructions 21
6.6.3 Flue Configuration Description
1
1
6.6.3.1 Horizontal Concentric Flue ⌀ 60/100 mm or ⌀ 80/125 mm (C13 type installation)
1 Gasket (fitted)
6.6.3.3 Vertical Concentric Flue ⌀ 60/100 mm or ⌀ 80/125 mm (C33 type installation)
Note
If the terminal is at less than 1.80 m from the
ground, you must install a terminal protection kit.
Consult the separate installation manual for air/flue gas systems supplied with your appliance for all possibilities and associated accessories and how to install the flue system.
6.6.3.2 Terminal protection
Consult the separate installation manual for air/flue gas systems supplied with your appliance for all possibilities and associated accessories and how to install the flue system.
6.7 Using the installation template
▶ Use the installation template to ascertain the locations at
which you need to drill holes and make breakthroughs.
6.8 Wall-mounting the product
1. Check the load-bearing capacity of the wall.
2. Note the total weight of the product.
3. Only use fixing material that is permitted for the wall.
4. If required, ensure that mounting apparatus on-site has
sufficient load-bearing capacity.
5. Wall-mount the product as described.
A terminal guard is required if persons could come into contact with the terminal or the terminal could be subject to damage.
If a terminal guard is required, it must be positioned to
provide minimum of 50 mm clearance from any part of the
terminal and be central over the terminal.
The guard should be similar to that shown in the figure.
6. Install the product bracket (1) on the wall.
7. Hang the product on the product bracket from above
using the hanging bracket.
22 Installation and maintenance instructions ecoTEC plus 0020244997_06
6.9 Removing/installing the front casing
B
A
B
2x
B
A
C
D
6.10 Removing/installing the side section
6.9.1 Removing the front casing
▶ Remove the front casing as shown in the illustration.
6.10.1 Removing the side section
6.9.2 Installing the front casing
▶ Refit the components in the reverse order.
Caution.
Risk of material damage caused by mech-
anical deformation.
Removing both side sections may cause
mechanical distortion in the product, which
may cause damage to the piping, for example, and potentially result in leaks.
▶ Always only remove one side section –
never both side sections at the same time.
▶ Remove the side section as shown in the illustration.
6.10.2 Installing the side section
▶ Refit the components in the reverse order.
0020244997_06 ecoTEC plus Installation and maintenance instructions 23
7 Installation
7.1 Installation requirements
7.1.1 Information on the gas group
In the as-supplied condition, the product is preset for operation with the gas group indicated on the data plate.
7.1.2 Purging the liquid gas tank
If the liquid gas tank is not purged properly, this may result in
ignition problems.
▶ Ensure that the liquid gas tank has been purged properly
before installing the product.
▶ If required, contact the filler or the liquid gas supplier.
7.1.3 Using the correct gas type
Using the incorrect gas type may cause fault shutdowns in
the product. Ignition and combustion noise may occur in the
product.
▶ Only use the gas type listed on the data plate.
7.2 Preparing for installation
1. Make sure that the existing gas meter is capable of
passing the rate of gas supply required.
2. Consider the maximum heat output given in DHW
mode.
3. Install a system separator (to be provided on-site) directly on the cold water connection for the combi boiler.
4. Install the following components:
– Draining cocks at the lowest points in the heating
installation (→ current version of "BS 2879")
– A stopcock on the cold water connection
– A stopcock in the gas pipe
5. Check that the volumetric capacity of the expansion
vessel is sufficient for the system volume.
Condition: The volume of the installed expansion vessel is insufficient
▶ Install an additional expansion vessel, connected as
close to the product as possible, in the heating return.
Condition: External expansion vessel installed and warm start active
▶ Install a non-return valve in the product outlet (heating
flow) or decommission the internal expansion vessel in
order to prevent the warm start function from being increasingly activated due to backflow.
6. Install the connection pipes such that they are free from
mechanical stress.
7. If you use non-diffusion-tight plastic pipes in the heating
installation, ensure that no air gets into the heat generator circuit.
8. Only solder connectors if the connectors are not yet
screwed to the service valves.
9. Only bend connection pipes if they have not yet been
connected to the product.
10. Flush the heating installation thoroughly before
installing the product.
11. If, during gas tightness tests, you also place the gas
pipes and the gas valve assembly in the product under pressure, use a max. test pressure of ≤ 11 kPa
(110 mbar).
12. If you cannot limit the test pressure to 11 kPa
(110 mbar), close any gas stopcocks that are installed
upstream of the product before you carry out the gas
tightness test.
13. If, during gas tightness tests, you have closed the gas
stopcock that is installed upstream of the product, relieve the gas line pressure before you open this gas
stopcock.
7.3 Descaling the water
Scale deposition increases as the water temperature increases.
▶ Descale the water as required.
7.4 Installing the gas connection
1. Install the gas pipe in accordance with the recognised
rules of technology.
2. Connect the product to the gas line as shown in ac-
cordance with the recognised rules of good engineering practice.
3. Remove the residues from the gas line by blowing
through the gas line beforehand.
4. Purge the gas line before start-up.
7.5 Checking the gas line for leak-tightness
▶ Check the entire gas line properly for leak-tightness.
24 Installation and maintenance instructions ecoTEC plus 0020244997_06
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