Vaillant ecoTEC plus VU 446/5-5 (H-GB) User manual

en Installation and maintenance instructions
ecoTEC plus
VU 446/5-5 (H-GB)
VU 606/5-5 (H-GB)
0020261389_03 - 29.01.2021

2Installation and maintenance instructions ecoTEC plus 0020261389_03
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 ............................ 10
5 Product description........................................... 10
5.1 CE marking .......................................................... 10
5.2 Energy Saving Trust Endorsed Products ............ 10
5.3 Hot Water Association ......................................... 10
5.4 Information on the identification plate.................. 10
5.5 Serial number ...................................................... 10
5.6 Product design..................................................... 11
5.7 Safety Devices..................................................... 11
6 Set-up.................................................................. 12
6.1 Checking the scope of delivery............................ 12
6.2 Dimensions .......................................................... 12
6.3 Installation site ..................................................... 13
6.4 Minimum clearances............................................ 13
6.5 Clearance from combustible components ........... 13
6.6 Compartment Ventilation ..................................... 13
6.7 Air/flue pipe.......................................................... 13
6.8 Using the mounting template............................... 17
6.9 Wall-mounting the product................................... 17
6.10 Removing/installing the front casing.................... 18
6.11 Removing/installing the side section ................... 18
7 Installation.......................................................... 20
7.1 Preparing for installation...................................... 20
7.2 Sample system installations ................................ 20
7.3 Selecting the domestic hot water cylinder ........... 23
7.4 Selecting a low loss header................................. 23
7.5 Gas connection.................................................... 23
7.6 Checking the gas line for leak-tightness.............. 24
7.7 Hydraulic connection ........................................... 24
7.8 Connecting the drainage devices ........................ 25
7.9 Connecting the condensate discharge pipe ........ 25
7.10 Flue installation.................................................... 27
7.11 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
9 Start-up ............................................................... 32
9.1 Carrying out the initial start-up............................. 32
9.2 Starting up the product ........................................ 32
9.3 Calling up appliance config. and diagnostics
menu.................................................................... 32
9.4 Running the installation assistants ...................... 32
9.5 Using test programmes........................................ 33
9.6 Using check programmes.................................... 33
9.7 Descaling the water ............................................. 33
9.8 Checking and treating the heating water/filling
and supplementary water .................................... 33
9.9 Filling the condensate siphon .............................. 34
9.10 Preventing low water pressure ............................ 34
9.11 Flushing the heating installation for the first
time ("cold") ......................................................... 35
9.12 Filling the heating installation .............................. 35
9.13 Gas inspection ..................................................... 36
9.14 Thoroughly flushing the heating installation
("hot")................................................................... 39
9.15 Checking leak-tightness ...................................... 39
10 Adapting the unit to the heating
installation.......................................................... 40
10.1 Activating diagnostics codes ............................... 40
10.2 Adapting the heating settings .............................. 40
10.3 Setting the maintenance interval ......................... 42
11 Handing over to the end user........................... 42
12 Inspection and maintenance ............................ 43
12.1 Complete Service Interval Record section .......... 43
12.2 Using original seals.............................................. 43
12.3 Inspection and maintenance................................ 43
12.4 Using the function menu...................................... 43
12.5 Carrying out electronics self-tests ....................... 43
12.6 Checking the electrical plug connections ............ 43
12.7 Cleaning/checking the components..................... 43
12.8 Completing inspection and maintenance work .... 47
13 Troubleshooting ................................................ 47
13.1 Contacting your service partner........................... 47
13.2 Calling up service messages............................... 47
13.3 Reading off the fault codes.................................. 47
13.4 Querying the fault memory .................................. 47
13.5 Resetting the fault memory.................................. 48
13.6 Resetting parameters to factory settings ............. 48
13.7 Performing diagnostics ........................................ 48
13.8 Using check programmes.................................... 48
13.9 Replacing defective components......................... 48
14 Decommissioning.............................................. 52
14.1 Temporarily decommissioning the product.......... 52
14.2 Permanently decommissioning............................ 52
15 Recycling and disposal..................................... 52
16 Customer service............................................... 53
Appendix ............................................................................ 54
A Inspection and maintenance work –
Overview............................................................. 54
B Overview of diagnostics codes........................ 55
C Status codes –Overview .................................. 58
D Fault messages –Overview.............................. 60
E Wiring diagram................................................... 64

0020261389_03 ecoTEC plus Installation and maintenance instructions 3
F Basic installation diagram ................................ 66
F.1 0020253233......................................................... 66
F.2 0020259030......................................................... 67
F.3 Key for the basic system diagrams...................... 68
G Commissioning Checklist................................. 69
H Commissioning Flow Chart .............................. 74
Index ................................................................................... 75

4Installation and maintenance instructions ecoTEC plus 0020261389_03
1 Safety
1.1 Intended use
The product is intended as a heat generator
for sealed heating installations and for do-
mestic hot water generation.
Improper use of any kind is prohibited.
Intended use also includes the following:
–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 in-
stallation
–Installing and setting up the product while
observing the product and system ap-
proval
–Observing all inspection and maintenance
conditions listed in the instructions
–Installing while observing the IP code
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 in-
stalled in a fixed and permanent location
(known as "fixed installation").
–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
1.2 Qualification
The person carrying out the work described
here must have completed professional train-
ing. The competent person must demon-
strably 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 qual-
ifications.
This product can be used by children over
eight years old and also by persons with lim-
ited 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 res-
ulting 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.
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.
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.
▶Do not use any electrical switches, mains
plugs, doorbells, telephones or other com-
munication 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

0020261389_03 ecoTEC plus Installation and maintenance instructions 5
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 prop-
erty:
▶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.
If you operate the product with an empty con-
densate trap / siphon, then flue gas may es-
cape into the room air.
▶In order to operate the product, ensure that
the condensate trap / siphon is always full.
Condition: Permitted B23 or B23P unit types
with condensate siphon (third-party access-
ory)
–Water seal level: ≥200 mm
To ensure that the seals are not damaged:
▶Instead of grease, use only water or com-
mercially available soft soap to aid installa-
tion.
1.3.3 Air supply
Unsuitable or insufficient combustion and
room air may lead to material damage, but
also to life-threatening situations.
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 unobstruc-
ted and sufficient in accordance with the
relevant ventilation requirements. This also
applies, in particular, for cupboard installa-
tions.
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, am-
monia compounds, dust or similar sub-
stances.
▶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.
Validity: Except Great Britain
▶Ensure that the combustion air is not
routed through chimneys which have
previously been used with oil-fired floor-
standing boilers, or with other boilers,
which could cause soot to build up in the
chimney.
1.3.4 Electricity
The power supply terminals L and N remain
live.
To prevent electric shocks, proceed as fol-
lows 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 con-
tact gap of at least 3 mm, e.g. fuse or cir-
cuit 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.
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.

6Installation and maintenance instructions ecoTEC plus 0020261389_03
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 sub-
stances (such as petrol, paper or paint).
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
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
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.
1.3.13 Risk of damage to the flexible gas
pipe
The corrugated gas pipe may become dam-
aged 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.
1.5 List of relevant standards for Great
Britain and Ireland
▶Observe the national regulations, stand-
ards, directives, ordinances and laws.
Validity: Great Britain OR Ireland
You can find a list of relevant standards at:
https://www.vaillant.co.uk/standards

0020261389_03 ecoTEC plus Installation and maintenance instructions 7
2 Guarantee and Customer Service
Validity: Great Britain OR Ireland
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: [phone]
Technical Enquiries:
Telephone: [phone]
Email: [e-mail]
General Enquiries:
Telephone: [phone]
Training Enquiries:
Telephone: [phone]
Email: [e-mail]
Spares Enquiries:
Telephone: [phone]
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.

8Installation and maintenance instructions ecoTEC plus 0020261389_03
3 Technical data
Technical data –General
VU 446/5-5 (H-GB) VU 606/5-5 (H-GB)
Gas category II2H3P II2H3P
Diameter of the gas pipe at the product outlet 25 mm 25 mm
Diameter at the outlet of the gas compression fitting, outside thread 1" 1"
Diameter at the outlet of the gas stopcock, inside thread 1" 1"
Diameter of the heating pipe at the product outlet, outside thread 1 1/2" 1 1/2"
Diameter at the outlet of the heating connection, outside thread 1 1/2" 1 1/2"
Diameter at the outlet of the heating stopcock, inside thread 1 1/4" 1 1/4"
Connection diameter of the expansion relief valve, inside thread 1" 1"
Air/flue connection 80/125 mm 80/125 mm
G20 gas flow pressure 2.0 kPa
(20.0 mbar)
2.0 kPa
(20.0 mbar)
G31 gas flow pressure 3.7 kPa
(37.0 mbar)
3.7 kPa
(37.0 mbar)
CE number (PIN) CE-0063CS3428 CE-0063CS3428
Min. flue gas mass flow rate 3.9 g/s 5.3 g/s
Max. flue gas mass flow rate 20.3 g/s 27.0 g/s
Released system types C13, C33, C43, C53, C93,
B23, B23(P), B33, B53,
B53(P)
C13, C33, C43, C53, C93,
B23, B23(P), B33, B53,
B53(P)
Min. flue gas temperature at P 50/30 °C 37 ℃37 ℃
Max. flue gas temperature at P 50/30 °C 53 ℃61 ℃
Min. flue gas temperature at P 80/60 °C 61 ℃65 ℃
Max. flue gas temperature at P 80/60 °C 78 ℃78 ℃
Nominal efficiency at 80/60 °C 97.5 % 97.8 %
Nominal efficiency at 50/30 °C 106.2 % 105.9 %
Nominal efficiency at 60/40 °C 103.2 % 102.8 %
Nominal efficiency in partial load mode (30%) at 40/30 °C 109.1 % 109.5 %
NOx class 6 6
NOx emission weighted in accordance with EN 15502 ≤40 mg/kW⋅h≤40 mg/kW⋅h
SAP 2009/2012 annual efficiency (%) 89.4 % 89.4 %
Product dimensions, width 440 mm 440 mm
Product dimensions, depth 405 mm 473 mm
Product dimensions, height 720 mm 720 mm
Net weight 37.8 kg 47.2 kg
Technical data –Power/heat input (G20)
VU 446/5-5 (H-GB) VU 606/5-5 (H-GB)
Nominal heat output range P at 50/30 °C 8.7 to 48.0 kW 12.2 to 63.5 kW
Nominal heat output range P at 60/40 °C 8.5 to 46.6 kW 11.8 to 61.7 kW
Nominal heat output range P at 80/60 °C 7.8 to 44.1 kW 11.0 to 58.7 kW
Maximum heat input (Q max.) 45.2 kW 60.0 kW
Minimum heat input (Q min.) 8.1 kW 11.3 kW
Technical data –Power/heat input (G31)
VU 446/5-5 (H-GB) VU 606/5-5 (H-GB)
Nominal heat output range P at 50/30 °C 8.6 to 46.6 kW 12.0 to 62.1 kW
Nominal heat output range P at 80/60 °C 7.8 to 44.0 kW 11.1 to 58.4 kW
Maximum heat input (Q max.) 45.2 kW 60.0 kW
Minimum heat input (Q min.) 8.1 kW 11.3 kW

0020261389_03 ecoTEC plus Installation and maintenance instructions 9
Technical data –Heating
VU 446/5-5 (H-GB) VU 606/5-5 (H-GB)
Maximum heating flow temperature (default setting –D.71) 75 ℃75 ℃
Range for the heating flow temperature control 30 to 80 ℃30 to 80 ℃
Maximum permissible pressure (PMS) 0.35 MPa (3.5 bar) 0.35 MPa (3.5 bar)
Safety discharge of expansion relief valve 0.4 MPa
(4.0 bar)
0.4 MPa
(4.0 bar)
Nominal water flow (ΔT = 20 K) 1,900 l/h 2,500 l/h
Approximate value for the condensate volume (pH value between
3.5 and 4.0) at 50/30 °C
4.5 l/h 5.6 l/h
Maximum heat output (factory setting –D.000) Auto Auto
Technical data –Electrics
VU 446/5-5 (H-GB) VU 606/5-5 (H-GB)
Electric connection –230 V
–50 Hz
–230 V
–50 Hz
Built-in fuse (slow-blow) T4H/4A,250V T4H/4A,250V
Maximum electrical power consumption ≤162 W ≤250 W
Standby electrical power consumption 1.8 W 1.8 W
IP rating IPX4D IPX4D
Permissible connected voltage 195 to 253 V 195 to 253 V

10 Installation and maintenance instructions ecoTEC plus 0020261389_03
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 446/5-5 (H-GB) ecoTEC plus 0010021520
VU 606/5-5 (H-GB) ecoTEC plus 0010021521
Gas Council Number
VU 446/5-5 (H-GB) ecoTEC plus 41-694-28
VU 606/5-5 (H-GB) ecoTEC plus 41-694-29
5 Product description
This product is a gas-fired wall-hung condensing boiler.
5.1 CE marking
The CE marking shows that the products comply with the
basic requirements of the applicable directives as stated on
the declaration of conformity.
The declaration of conformity can be viewed at the manufac-
turer's site.
5.2 Energy Saving Trust Endorsed Products
Validity: Great Britain
Only the most energy efficient products can carry the
‘Energy Saving Trust Endorsed Product’ brandmark making
it easy for consumers to choose products that have met strict
energy performance criteria.
Available for: Boilers, Heating controls and chemical inhib-
itors, the Energy Saving Trust endorsed product brandmark
gives consumers confidence that a product will cost less to
run, help lower energy bills and reduce carbon emissions.
About the Energy Saving Trust
Energy Saving Trust is an independent and impartial organ-
isation that provides trusted energy saving advice to em-
power millions of people to lead affordable, low energy life-
styles. For more information visit energysavingtrust.org.uk
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.
Validity: Great Britain
Information on the
identification plate
Meaning
Serial number for identification; 7th to 16th digits =
product article number
VU… Vaillant gas-fired wall-hung boiler for
heating
ecoTEC plus Product description
2H, G20 - 20 mbar
(2 kPa)
Gas group and gas connection pressure
as set at the factory
Cat. Unit category
Types Gas-fired boiler types
PMS Permissible total overpressure in heating
mode
PMW Permissible total overpressure during hot
water generation
Tmax. Max. flow temperature
ED 92/42 Current efficiency directive fulfilled with
4* rating
230 V 50 Hz Electric connection
W Max. electrical power consumption
IP Level of protection
Heating mode
P Nominal heat output range
Q Heat input range
Note
Make absolutely sure that the product is compat-
ible with the gas group at the installation site.
5.5 Serial number
The serial number can be found on the identification plate.

0020261389_03 ecoTEC plus Installation and maintenance instructions 11
5.6 Product design
6 13 2
8
9
10
11
12
13
14
15 16 17 18
19
7
5 4
1 Rainwater drain hose
2 Hydraulic pressure
sensor
3 Heating pump
4 Dynamic air separation
system
5 Water-pressure mano-
meter
6 Electronics box
7 Condensate siphon
8 Gas valve assembly
9 Fan
10 Compact thermal
module
11 Ignition electrode
12 Integrated condensation
heat exchanger
13 Air intake pipe
14 Temperature sensor in
the heating flow
15 Temperature sensor in
the heating return
16 Connection for the
air/flue pipe
17 Flue gas measuring
stub pipe
18 Rainwater collecting
device
19 Pressure switch
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/ Servi-
cing company or Vaillant service.
5.7.3 Frost protection
The appliance has a built in frost protection device that pro-
tects the boiler from freezing. With the gas and electric sup-
plies ON and irrespective of any room thermostat setting, the
frost protection device will operate the pump when the tem-
perature of the boiler water falls below 12 °C.
A timer is used so that the temperature can be checked peri-
odically. 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 temper-
ature 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 con-
densate 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.

12 Installation and maintenance instructions ecoTEC plus 0020261389_03
6 Set-up
6.1 Checking the scope of delivery
Validity: VU 446/5-5 (H-GB) OR VU 606/5-5 (H-GB)
▶Check that the scope of delivery is complete and intact.
Number Designation
1Heat generator
1
Bag of set-up parts with retainer for the wall-
mounting, fastening accessories and condensate
discharge hose
1
Cardboard box for the hydraulic connection
with expansion relief valve, draining cock, air
separator and seals
1Cardboard box with the stopcocks for the heating
circuit
1 Cardboard box with the stopcock for the gas line
assembly
1Documentation material including gas conversion
set
6.2 Dimensions
108
100
A
100 100
173
440
125
78
720
220
235
120120
29,5
825
6
12 3
12
13
4 5
7
8
9
10
11
85,5133,8
1 Condensate siphon
2 Heating flow connection
3 Gas connection
4 Heating return connec-
tion
5 Drain for the rainwater
collecting device
6 Position of the holes for
the flue system
7 Retainer for securing
the product
8 Gas pressure connec-
tion
9 Gas stopcock

0020261389_03 ecoTEC plus Installation and maintenance instructions 13
10 Stopcock in the heating
return
11 Stopcock in the heating
flow
12 Connection for the
air/flue pipe
13 Drain for the dynamic
air separation system
Dimension A
VU 446/5-5 (H-GB) 405 mm
VU 606/5-5 (H-GB) 473 mm
6.3 Installation site
Validity: Great Britain OR Ireland
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
C C
AB
D
▶When using the accessories, observe the minimum clear-
ances/installation clearances.
Minimum clearances
A B C D
≥275 mm ≥180 mm ≥5 mm ≥500 mm
–Optimum dimension (B):≈250 mm
–Optimum dimension (C):≈50 mm
–Dimension (D): The clearance in front of the product
to facilitate easy access for maintenance work can
be reduced to 5 mm if there is a door in front of the
product
6.5 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.
6.6 Compartment Ventilation
Validity: Great Britain
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.
6.7 Air/flue pipe
6.7.1 Regulation
Validity: Great Britain OR Ireland
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.
Minimum fall
44 mm/m
–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 Installa-
tions”.
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.

14 Installation and maintenance instructions ecoTEC plus 0020261389_03
6.7.2 Position of the air/flue terminal
Validity: Great Britain OR Ireland
J
J
N
Q
S
S
P
UB
Boundary
G
D
J
JR
VM
T
G
C
W
E
F
L
A
K
S
P
S
F
X
A
Y
Boundary
Z
H
Aa
S
Z
Ba
6.7.2.1 Positioning the terminal of a fan-supported flue system
Validity: Great Britain OR Ireland
Installation site Dimensions
AAdjacent to a boundary. 300 mm
B1) The dimension below eaves, balconies and car ports can be reduced to this value, as long as the flue terminal is
extended to clear any overhang. External flue joints must be sealed with a suitable silicon sealant. 25 mm
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
F2) Distance to a boundary line, unless it will cause a nuisance. BS 5440:Part 1 recommends that care is taken
when siting terminal in relation to boundary lines. 600 mm
G Minimum clearance from a skylight to a vertical flue or to another vertical flue. Min. 300 mm
HVertical flue clearance, to noncombustible building material.
Vertical flue clearance to combustible building material.
500 mm
1,500 mm
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
L2) To an internal or external corner. 200 mm
MBelow a Velux window.
Above or to either side of the Velux window.
2,000 mm
600 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.

0020261389_03 ecoTEC plus Installation and maintenance instructions 15
Installation site Dimensions
NFrom a pitched roof.
In regions with heavy snowfall.
400 mm
500 mm
P From vertical drain pipes and soil pipes. 25 mm
QBelow eaves.
Below gutters, pipe and drains.
200 mm
75 mm
RThe dimension below eaves, balconies and car ports can be reduced to this value, as long as the flue terminal is
extended to clear any overhang. External flue joints must be sealed with suitable silicon sealant. 25 mm
S Above adjacent ground or balcony. 300 mm
T2) Distance to a surface facing a terminal, unless it will cause a nuisance. BS 5440: Part 1 recommends that care
is taken when siting terminals in relation to surfaces facing a terminal.
600 mm
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.
2000 mm
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.
300 mm
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.
6.7.2.2 Horizontal terminal positioning
Validity: Great Britain OR Ireland
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 con-
densate plume does not affect adjacent surfaces the terminal should be extended as shown below.

16 Installation and maintenance instructions ecoTEC plus 0020261389_03
Balcony/eaves
Gutter
Adequately secured
air/flue gas pipe
The flue pipe must
protrude beyond any overhang
You can use a plume management kit to enable the termination point to be positioned and directed away from the building
fabric.

0020261389_03 ecoTEC plus Installation and maintenance instructions 17
6.7.3 Flue Configuration Description
6.7.3.1 Horizontal Concentric Flue ⌀80/125 mm (C13
type installation)
1
1 Gasket (fitted)
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 sys-
tems supplied with your appliance for all possibilities and as-
sociated accessories and how to install the flue system.
6.7.3.2 Terminal protection
Validity: Great Britain OR Ireland
A terminal guard is required if persons could come into con-
tact with the terminal or the terminal could be subject to dam-
age.
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.
6.7.3.3 Vertical Concentric Flue ⌀80/125 mm (C33
type installation)
Consult the separate installation manual for air/flue gas sys-
tems supplied with your appliance for all possibilities and as-
sociated accessories and how to install the flue system.
6.8 Using the mounting template
▶Use the mounting template to ascertain the locations at
which you need to drill holes and make breakthroughs.
6.9 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.

18 Installation and maintenance instructions ecoTEC plus 0020261389_03
6.10 Removing/installing the front casing
6.10.1 Removing the front casing
A
B
B
C
D
1. Undo the screw (A).
2. Push in both retaining clips (B) so that the front casing
is released.
3. Pull the front casing forwards at the bottom edge (C).
4. Lift the front casing upwards from the bracket (D).
6.10.2 Installing the front casing
C
B
A
D
E
1. Place the front casing (A) on the upper retainer (B).
2. Hinge the front casing down in the direction of the
product (C).
3. Push the front casing onto the product and, in doing so,
ensure that the insulation is not damaged (D).
4. Let the retaining clips on the front casing snap into
place.
5. Tighten the screw (E) in order to secure the front cas-
ing.
6.11 Removing/installing the side section
6.11.1 Removing the side section
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 ex-
ample, and potentially result in leaks.
▶Always only remove one side section –
never both side sections at the same time.

0020261389_03 ecoTEC plus Installation and maintenance instructions 19
2X
A
B
C
D
▶Remove the side section as shown in the illustration.
6.11.2 Installing the side section
▶Install the side section; to do so, proceed in reverse order
to how you removed it.

20 Installation and maintenance instructions ecoTEC plus 0020261389_03
7 Installation
7.1 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 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
–A filling/draining device in the heating installation
4. Install the connection pipes such that they are free
from mechanical stress.
5. If you use non-diffusion-tight plastic pipes in the heat-
ing installation, ensure that no air gets into the heat
generator circuit.
6. Only solder connectors if the connectors are not yet
screwed to the service valves.
7. Only bend connection pipes if they have not yet been
connected to the product.
8. Flush the heating installation thoroughly before in-
stalling the product.
9. If, during gas leak-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).
10. If you cannot limit the test pressure to 11 kPa
(110 mbar), close any gas stopcocks that are installed
upstream from the product before you carry out the gas
leak-tightness test.
11. If, during gas leak-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.
12. If the hydraulic circuit contains a pump other than
the one for the product, only start up the product if a
sufficiently dimensioned low loss header is installed
between the heat generator circuit and the heating
circuit or the cylinder charging circuit.
Low loss header (→Page 23)
13. If the product's pump is the only circulation pump in
the hydraulic circuit, check whether the product's feed
head is sufficient for the installation. (→Page 41)
▽If this is not the case, use an appropriately de-
signed low loss header and circulation pump.
14. With older installations in particular, install a magnetic
filter at the heating circuit return in order to protect the
product against dirt from the installation.
–Ensure that there is sufficient dimensioning in order
to prevent it from blocking quickly and to prevent
high pressure losses.
15. Use fibre seals. Seals made of rubber-like materials
may be subject to plastic deformation, which can lead
to pressure losses.
7.2 Sample system installations
▶Use the basic installation diagrams as examples.
▶Select the basic installation diagram based upon which
you want to configure your installation.
▶Only install the control systems that are listed in the
tables for the basic system diagrams in order to ensure
that all of the system's functions are available.
▶Establish the connections correctly.
▶Observe the applicable national and international laws,
standards and directives.
▶With older installations in particular, install a magnetic
filter at the heating circuit return in order to protect the
product against dirt from the installation.
–Ensure that there is sufficient dimensioning in order
to prevent it from blocking quickly and to prevent high
pressure losses.
▶Observe the information on treating heating water.
(→Page 33)
▽If you cannot guarantee the conditions for treating
the heating water, install an external plate heat ex-
changer to protect the product.
▶Install the required safety devices and system compon-
ents in the installation.
7.2.1 Basic system diagram type 1: One direct
heating circuit with one optional domestic
hot water cylinder
Note
This basic diagram type can then only be used if
the product's pump is the only pump in the sys-
tem.
1
2 3 4
1 Wall-hung boiler with
internal pump
2 Prioritising diverter
valve
3 Heating circuit
4 Domestic hot water
cylinder
▶To use this basic diagram type, ensure that the product
works within the defined operating ranges. (→Page 41)
Number for
the basic
diagram
Control
system
Number
of cir-
cuits
Carrying out the
wiring
0020253233 Basic control 1 See appendix or
contact customer
service for special
basic diagrams.