Vaillant ECOTEC PRO 24 Boiler Range User Manual

en Installation and maintenance instructions

ecoTEC pro

VUW ..6/5-3

0020244995_05 - 17.02.2021

2 Installation and maintenance instructions ecoTEC pro 0020244995_05

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 ............................ 11

5 Product description........................................... 11

5.1 CE marking.......................................................... 11

5.2 Energy Saving Trust Endorsed Products ............ 11

5.3 Hot Water Association ......................................... 11

5.4 Information on the identification plate.................. 11

5.5 Serial number ...................................................... 12

5.6 Product design..................................................... 12

5.7 Safety Devices..................................................... 12

6 Set-up.................................................................. 13

6.1 Checking the scope of delivery............................ 13

6.2 Dimensions.......................................................... 13

6.3 Installation site..................................................... 14

6.4 Minimum clearances............................................ 14

6.5 Compartment Ventilation ..................................... 14

6.6 Air/flue pipe.......................................................... 14

6.7 Using the installation template............................. 17

6.8 Wall-mounting the product................................... 17

6.9 Removing/installing the front casing.................... 18

6.10 Removing/installing the side section ................... 18

7 Installation.......................................................... 19

7.1 Installation requirements ..................................... 19

7.2 Installing the gas connection ............................... 19

7.3 Checking the gas line for leak-tightness.............. 19

7.4 Installing the hot and cold water connection........ 20

7.5 Connecting the heating flow and heating

return ................................................................... 20

7.6 Installing the drain pipe on the expansion relief

valve .................................................................... 20

7.7 Connecting the condensate discharge pipe ........ 20

7.8 Flue installation.................................................... 23

7.9 Electrical installation ............................................ 23

8 Operation............................................................ 26

8.1 Operating concept ............................................... 26

8.2 Installer level overview......................................... 26

8.3 Calling up the installer level................................. 26

8.4 Live Monitor (status codes) ................................. 26

8.5 Setting the hot water temperature ....................... 26

9 Start-up ............................................................... 27

9.1 Carrying out the initial start-up............................. 27

9.2 Checking and treating the heating water/filling

and supplementary water .................................... 27

9.3 Filling the condensate trap .................................. 28

9.4 Switching the product on and off ......................... 28

9.5 Using check programmes.................................... 28

9.6 Preventing low water pressure ............................ 28

9.7 Flushing the heating installation for the first

time ("cold") ......................................................... 28

9.8 Filling the heating installation .............................. 28

9.9 Purging the heating installation ........................... 29

9.10 Filling and purging the hot water system ............. 29

9.11 Gas inspection..................................................... 29

9.12 Thoroughly flushing the heating installation

("hot")................................................................... 31

9.13 Checking leak-tightness ...................................... 31

10 Adapting the unit to the heating

installation.......................................................... 31

10.1 Calling up diagnostics codes ............................... 31

10.2 Burner anti-cycling time ....................................... 31

10.3 Setting the maintenance interval ......................... 32

10.4 Setting the pump output....................................... 32

10.5 Setting the bypass valve...................................... 32

11 Handing over to the end user........................... 33

12 Inspection and maintenance ............................ 34

12.1 Complete Service Interval Record section .......... 34

12.2 Using original seals.............................................. 34

12.3 Inspection and maintenance................................ 34

12.4 Preparing the maintenance work......................... 34

12.5 Removing the compact thermal module .............. 34

12.6 Cleaning the heat exchanger............................... 35

12.7 Checking the burner ............................................ 35

12.8 Cleaning the condensate trap.............................. 35

12.9 Cleaning the filter in the cold water inlet.............. 35

12.10 Installing the compact thermal module ................ 36

12.11 Draining the product ............................................ 36

12.12 Checking the pre-charge pressure for the

internal expansion vessel .................................... 36

12.13 Checking the filling pressure of the heating

installation............................................................ 36

12.14 Checking the quality of the heating water............ 36

12.15 Completing inspection and maintenance work .... 36

12.16 Checking the product for leak-tightness .............. 37

13 Troubleshooting ................................................ 37

13.1 Checking service messages................................ 37

13.2 Eliminating faults.................................................. 37

13.3 Calling up and clearing the fault memory ............ 37

13.4 Resetting parameters to factory settings ............. 37

13.5 Preparing the repair work .................................... 37

13.6 Replacing defective components......................... 37

13.7 Completing repair work........................................ 39

13.8 Checking the product for leak-tightness .............. 39

14 Decommissioning.............................................. 39

14.1 Temporarily decommissioning the product.......... 39

14.2 Permanently decommissioning the product......... 39

0020244995_05 ecoTEC pro Installation and maintenance instructions 3

15 Recycling and disposal..................................... 39

Appendix ............................................................................ 40

A Inspection and maintenance work................... 40

B Overview of diagnostics codes........................ 41

C Status codes – Overview .................................. 45

D Overview of fault codes .................................... 46

E Check programmes – Overview ....................... 48

F Wiring diagrams................................................. 49

F.1 Product connection diagram with integrated

hot water generation............................................ 49

G Commissioning Checklist................................. 50

H Commissioning Flow Chart .............................. 54

Index ................................................................................... 55

4 Installation and maintenance instructions ecoTEC pro 0020244995_05

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:

– use of the product only in mobile homes

that are made, transported once and per-

manently situated in Great Britain and Ire-

land. After the transportation of the mo-

bile 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 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.

0020244995_05 ecoTEC pro Installation and maintenance instructions 5

▶ 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

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.

▶ 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 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.

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.

6 Installation and maintenance instructions ecoTEC pro 0020244995_05

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 27)

▶ 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.

1.4 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.

You can find a list of relevant standards at:

https://www.vaillant.co.uk/standards

0020244995_05 ecoTEC pro Installation and maintenance instructions 7

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.

8 Installation and maintenance instructions ecoTEC pro 0020244995_05

3 Technical data

Technical data – General

VUW 246/5-

3 (H-GB)

ecoTEC pro

VUW 286/5-

3 (H-GB)

ecoTEC pro

VUW 286/5-

3 (P-GB)

ecoTEC pro

Designated country (des-

ignation in accordance

with ISO 3166)

GB (Great

Britain), IE

(Ireland)

GB (Great

Britain), IE

(Ireland)

GB (Great

Britain), IE

(Ireland)

Approved unit categories

2H3P

Gas connection, boiler

side

15 mm 15 mm 15 mm

Flow/return heating con-

nections, boiler side

22 mm 22 mm 22 mm

Hot and cold water con-

nection, boiler side

G 3/4″ G 3/4″ G 3/4″

Expansion relief valve

connection pipe (min.)

15 mm 15 mm 15 mm

Air/flue gas connection

60/100 mm 60/100 mm 60/100 mm

Condensate drain pipe-

work (min.)

19 mm 19 mm 19 mm

G20 natural gas flow

pressure

2.0 kPa

(20.0 mbar)

2.0 kPa

(20.0 mbar)

–

G31 propane gas flow

pressure

– – 3.7 kPa

(37.0 mbar)

Gas flow rate at 15 °C

and 1013 mbar (based

on domestic hot water

generation, if applicable),

G20

2.5 m³/h 2.9 m³/h –

Gas flow rate at 15 °C

and 1013 mbar (based

on domestic hot water

generation, if applicable),

G31

– – 2.2 kg/h

Min. flue gas mass flow

rate (G20)

2.47 g/s 2.47 g/s –

Min. flue gas mass flow

rate (G31)

– – 3.49 g/s

Max. flue gas mass flow

rate

10.8 g/s 12.6 g/s 12.6 g/s

Min. flue gas temperature

40 ℃ 40 ℃ 40 ℃

Max. flue gas temperat-

ure

70 ℃ 70 ℃ 70 ℃

Approved gas-fired units

C13, C33,

C43, C53

C13, C33,

C43, C53

C13, C33,

C43, C53

30% efficiency

109.4 % 109.4 % 108 %

NOx class

6 6 6

Test symbol/registration

no.

CE‑

0085CM0320

CE‑

0085CM0320

CE‑

0085CM0320

SAP 2009/2012 annual

efficiency (%)

89.5 % 89.5 % 89.7 %

Boiler dimension, width

440 mm 440 mm 440 mm

Boiler dimension, height

720 mm 720 mm 720 mm

Boiler dimension, depth

338 mm 338 mm 338 mm

Approx. net weight

38 kg 38 kg 38 kg

0020244995_05 ecoTEC pro Installation and maintenance instructions 9

Technical data – G20 power/loading G20

VUW 246/5-

3 (H-GB)

ecoTEC pro

VUW 286/5-

3 (H-GB)

ecoTEC pro

Nominal heat output

range P at 50/30 °C

5.9 to 24.8 kW 5.9 to 25.9 kW

Nominal heat output

range P at 80/60 °C

5.2 to 23.0 kW 5.2 to 24.0 kW

Maximum heat output

for domestic hot water

generation

23.4 kW 27.0 kW

Maximum heat input for

domestic hot water gen-

eration

23.7 kW 27.5 kW

Maximum heat input,

heating side

23.5 kW 24.5 kW

Minimum heat input

5.5 kW 5.5 kW

Heating adjustment range

5 to 19 kW 5 to 19 kW

Nominal heat input ef-

ficiency (stationary) at

40/30 °C

107.0 % 107.0 %

Nominal heat input ef-

ficiency (stationary) at

50/30 °C

106.0 % 106.0 %

Nominal heat input ef-

ficiency (stationary) at

60/40 °C

101.0 % 101.0 %

Nominal heat input ef-

ficiency (stationary) at

80/60 °C

98.0 % 98.0 %

Technical data – Power/loading G31

VUW 286/5-

3 (P-GB)

ecoTEC pro

Nominal heat output

range P at 50/30 °C

7.9 to 25.3 kW

Nominal heat output

range P at 80/60 °C

7.2 to 24.0 kW

Maximum heat output

for domestic hot water

generation

27.0 kW

Maximum heat input for

domestic hot water gen-

eration

27.5 kW

Maximum heat input,

heating side

24.5 kW

Minimum heat input

7.7 kW

Nominal heat input ef-

ficiency (stationary) at

40/30 °C

105.0 %

Nominal heat input ef-

ficiency (stationary) at

50/30 °C

103.0 %

Nominal heat input ef-

ficiency (stationary) at

60/40 °C

101.0 %

Nominal heat input ef-

ficiency (stationary) at

80/60 °C

98.0 %

10 Installation and maintenance instructions ecoTEC pro 0020244995_05

Technical data – Heating

VUW 246/5-

3 (H-GB)

ecoTEC pro

VUW 286/5-

3 (H-GB)

ecoTEC pro

VUW 286/5-

3 (P-GB)

ecoTEC pro

Maximum flow temperat-

ure

85 ℃ 85 ℃ 85 ℃

Max. flow temperature

adjustment range (default

setting: 75 °C)

30 to 80 ℃ 30 to 80 ℃ 30 to 80 ℃

Permissible total excess

pressure

0.25 MPa

(2.50 bar)

0.25 MPa

(2.50 bar)

0.25 MPa

(2.50 bar)

Minimum pressure for

full operation

0.08 MPa

(0.80 bar)

0.08 MPa

(0.80 bar)

0.08 MPa

(0.80 bar)

Expansion vessel capa-

city

10 l 10 l 10 l

Circulation water volume

(with reference to

ΔT= 20 K)

813 l/h 813 l/h 813 l/h

Approx. condensate rate

(pH value 3.5 to 4.0) in

50/30 °C heating mode

1.9 l/h 1.9 l/h 1.9 l/h

Remaining feed head of

pump (at nominal circula-

tion water volume)

0.025 MPa

(0.250 bar)

0.025 MPa

(0.250 bar)

0.025 MPa

(0.250 bar)

Technical data – Hot water handling mode

VUW 246/5-

3 (H-GB)

ecoTEC pro

VUW 286/5-

3 (H-GB)

ecoTEC pro

VUW 286/5-

3 (P-GB)

ecoTEC pro

Lowest water volume

2.0 l/min 2.0 l/min 2.0 l/min

Water volume (at

ΔT = 30 K)

11.2 l/min 13 l/min 13 l/min

Water volume (at

ΔT = 35 K)

9.6 l/min 11.1 l/min 11.1 l/min

Water volume (at

ΔT = 42 K)

8.0 l/min 9.3 l/min 9.3 l/min

Permitted overpressure

1.0 MPa

(10.0 bar)

1.0 MPa

(10.0 bar)

1.0 MPa

(10.0 bar)

Required connection

pressure

0.035 MPa

(0.350 bar)

0.035 MPa

(0.350 bar)

0.035 MPa

(0.350 bar)

Hot water output temper-

ature range

35 to 65 ℃ 35 to 65 ℃ 35 to 65 ℃

Technical data – Electrics

VUW 246/5-

3 (H-GB)

ecoTEC pro

VUW 286/5-

3 (H-GB)

ecoTEC pro

VUW 286/5-

3 (P-GB)

ecoTEC pro

Electric connection

230 V/50 Hz 230 V/50 Hz 230 V/50 Hz

Permissible connected

voltage

190 to 253 V 190 to 253 V 190 to 253 V

Built-in fuse (slow-blow)

2 A 2 A 2 A

Min. electrical power con-

sumption

35 W 35 W 35 W

Max. electrical power

consumption

80 W 85 W 85 W

Standby electrical power

consumption

< 2 W < 2 W < 2 W

Level of protection

IP X4 D IP X4 D IP X4 D

0020244995_05 ecoTEC pro Installation and maintenance instructions 11

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

Article num-

ber

Gas Council

Number

VUW 246/5-3 (H-GB)

ecoTEC pro 24

0010021836 47-044-88

VUW 286/5-3 (H-GB)

ecoTEC pro 28

0010021837 47-044-89

VUW 286/5-3 (P-GB)

ecoTEC pro 28

0010021838 47-044-90

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 manufac-

turer's site.

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 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.

Information on the

data plate

Meaning

Read the instructions.

VUW… Vaillant gas-fired wall-hung boiler for

heating and domestic hot water genera-

tion

..6/5-3 Gross calorific value power/product

generation equipment

ecoTEC pro Product designation

2H, G20 – 20 mbar

(2.0 kPa)

Gas group and gas connection pressure

as set at the factory

ww/yyyy Date of manufacture: Week/year

Cat. Permissible gas categories

Types Approved gas-fired units

PMS Permissible total overpressure in heating

mode

PMW Permissible total overpressure during

domestic hot water generation

max.

Max. flow temperature

ED 92/42 Current efficiency directive fulfilled with

4* rating

V Hz Mains voltage and mains frequency

W Max. electrical power consumption

IP IP rating

Heating mode

Domestic hot water generation

P Nominal heat output range

Q Heat input range

D Nominal domestic hot water draw-off rate

Barcode with serial number,

7th to 16th digit = product article number

Note

Make absolutely sure that the product is compat-

ible with the gas group at the installation site.

12 Installation and maintenance instructions ecoTEC pro 0020244995_05

5.5 Serial number

The serial number can be found on a plastic label at the bot-

tom of the front casing and on the identification plate.

5.6 Product design

5.6.1 Functional elements, product with

integrated domestic hot water generation

1 Gas valve assembly

2 Water pressure sensor

3 Heat exchanger

4 Connection for the

air/flue pipe

5 Flue gas analysis point

6 Expansion vessel

7 Air intake pipe

8 Compact thermal

module

9 Ignition electrode

10 Fan

11 Automatic air vent

12 Manometer

13 Internal pump

14 Prioritising diverter

valve

15 Expansion relief valve

16 Electronics box

17 Impeller sensor (do-

mestic hot water)

18 Bypass valve

19 Secondary heat ex-

changer

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.

0020244995_05 ecoTEC pro Installation and maintenance instructions 13

6 Set-up

6.1 Checking the scope of delivery

▶ Check that the scope of delivery is complete and intact.

6.1.1 Scope of delivery

Num-

ber

Designation

Heat generator

1 Installation set containing the following:

- Unit mounting bracket

- Expansion relief valve connection pipe

1 - Domestic hot water connection pipe

4 - Service valve

- Bag with small parts

Mounting template

Condensate discharge hose

1 Enclosed documentation

6.2 Dimensions

720

624

160

125

188

100 100

3535

440

338

180

125

11 10

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

14 Installation and maintenance instructions ecoTEC pro 0020244995_05

Consult the installation template that is supplied to find the

dimension A.

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

B A

C C D

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).

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.

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.

0020244995_05 ecoTEC pro Installation and maintenance instructions 15

6.6.2 Position of the air/flue terminal

Boundary

6.6.2.1 Positioning the terminal of a fan-supported flue system

Installation site Dimensions

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

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

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

Vertical 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

To an internal or external corner. 200 mm

Below a Velux window.

Above or to either side of the Velux window.

2,000 mm

600 mm

From a pitched roof.

In regions with heavy snowfall.

400 mm

500 mm

P From vertical drain pipes and soil pipes. 25 mm

Below eaves.

Below gutters, pipe and drains.

200 mm

75 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.

16 Installation and maintenance instructions ecoTEC pro 0020244995_05

Installation site Dimensions

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 suitable silicon sealant.

25 mm

S Above adjacent ground or balcony. 300 mm

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.

6.6.2.2 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 con-

densate plume does not affect adjacent surfaces the terminal should be extended as shown below.

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.

0020244995_05 ecoTEC pro Installation and maintenance instructions 17

6.6.3 Flue Configuration Description

6.6.3.1 Horizontal Concentric Flue ⌀ 60/100 mm or

⌀ 80/125 mm (C13 type installation)

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.

6.6.3.2 Terminal protection

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.

6.6.3.3 Vertical Concentric Flue ⌀ 60/100 mm or

⌀ 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.

6.7 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.

6. Install the product bracket (1) on the wall.

7. Hang the product on the product bracket from above

using the hanging bracket.

18 Installation and maintenance instructions ecoTEC pro 0020244995_05

6.9 Removing/installing the front casing

6.9.1 Removing the front casing

▶ Remove the front casing as shown in the illustration.

6.9.2 Installing the front casing

▶ Refit the components in the reverse order.

6.10 Removing/installing the side section

6.10.1 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.

▶ Remove the side section as shown in the illustration.

6.10.2 Installing the side section

▶ Refit the components in the reverse order.

0020244995_05 ecoTEC pro Installation and maintenance instructions 19

7 Installation

7.1 Installation requirements

7.1.1 Information on the gas group

In the as-supplied condition, the product is preset for opera-

tion 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.

7.1.4 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) dir-

ectly 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 in-

creasingly 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 gener-

ator 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 un-

der 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, re-

lieve the gas line pressure before you open this gas

stopcock.

7.1.5 Descaling the water

Scale deposition increases as the water temperature in-

creases.

▶ Descale the water as required.

7.2 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 engineer-

ing practice.

3. Remove the residues from the gas line by blowing

through the gas line beforehand.

4. Purge the gas line before start-up.

7.3 Checking the gas line for leak-tightness

▶ Check the entire gas line properly for leak-tightness.

20 Installation and maintenance instructions ecoTEC pro 0020244995_05

7.4 Installing the hot and cold water connection

1. Make the water connections as shown in accordance

with the relevant standards.

2. Ensure correct water pressure and flow requirements

and that any expansion can be accommodated with the

cold supply pipe work.

7.5 Connecting the heating flow and heating

return

▶ Make the heating connections as shown in accordance

with the relevant standards.

7.6 Installing the drain pipe on the expansion

relief valve

1. Install the drain pipe for the expansion relief valve so

that it does not interfere with the removal and fitting of

the lower section of the condensate trap.

2. Install the drain pipe as shown (do not shorten).

3. Make sure that the end of the pipe is visible.

4. Ensure that discharged water or steam cannot cause

injury to persons or damage to electronic components.

5. Ensure the discharge pipe work is installed, routed and

terminated correctly to minimise the risk of freezing up.

7.7 Connecting the condensate discharge pipe

Danger!

Risk of death from escaping flue gases!

The condensate drain pipework for the si-

phon must not be connected tightly to waste-

water piping because, otherwise, the internal

condensate trap may be drained fully and flue

gas may escape.

▶ Do not connect the condensate drain

pipework tightly to the waste-water pip-

ing.

min.

180

The product is equipped with a condensate trap (2).

▶ Follow the instructions listed here and observe directives

and local regulations on condensed water discharge.

▶ If you cannot guarantee that the materials from which the

condensate discharge pipe is made are suitable, install a

system to neutralise the condensate.

▶ Connect the condensate discharge (1) to a condensate

discharge pipe (3) that has a minimum internal diameter

of 19 mm (30 mm internal diameter for all external pipes

that are fed out of the building) and is made from an acid-

resistant material (e.g. plastic overflow pipe).

0020244995_05 ecoTEC pro Installation and maintenance instructions 21

– The condensate discharge pipework must have

a continuous fall (45 mm per metre) and should

whenever possible terminate at a suitable discharge

point within the heated envelope of the building

that will remain frost free under long periods of low

external temperatures.

Note

Ensure that the connection between the con-

densate discharge pipe and the drain hose is

not air-tight.

▶ During installation remove all burs from inside of cut pipe

work and avoid excessive adhesive which may trap small

pockets of water close to the pipe wall which can freeze

and build into a larger ice plug.

▶ As with other pipe work insulate the condensate dis-

charge pipe to minimise any risk of freezing and beware

when crossing cavities that the fall is maintained and the

pipe sleeved.

▶ Ensure that the condensate discharge pipe terminates in

a suitable location. Further information can be obtained

from BS 6798 Specification for installation of gas–fired

boilers of rated input not exceeding 70 kW net.

▶ Leave an installation space of at least 180 mm beneath

the condensate trap.

7.7.1 Condensate discharge systems

It is not necessary to provide extra traps in the discharge

pipe as there is already a trap inside the boiler. Fitting an

extra trap may cause the boiler siphon to work incorrectly.

Refer to BS5546 or BS6798 for further advice on disposal of

boiler condensate.

7.7.1.1 Direct Connection to internal soil and vent

stack

Ø22mm

Preferred option

7.7.1.2 Direct connection to external soil and vent

stack

Ø22mm

Ø 32mm

≤ 3 m

7.7.1.3 External termination to gulley or hopper

Ø22mm

Ø 32mm

≤ 3 m

Best practice

7.7.1.4 Internal termination into combined sink

waste

Ø32mm

Ø22mm

≥ 3 m

100mm

Preferred option for external termination

22 Installation and maintenance instructions ecoTEC pro 0020244995_05

7.7.1.5 External termination into soakaway

< 500 mm

100 mm

< 300 mm

50 25 25

< 25

Ø12

Ø32mm

≤ 3 m

1 Ground (either/or)

2 Seal

3 Plastic tube,

100 mm diameter

4 Bottom of sealed tube

5 Limestone chippings

6 Hole depth 400 mm

minimum

Least preferred option, must not terminate in rain water drain

7.7.1.6 Internal termination downstream of sink

waste

100mm

Ø32mm

Ø22mm

≤ 3 m

Open end of pipe direct into gulley below ground level but

above water level

Susceptible to siphonage, must terminate in a gulley

7.7.1.7 External termination into rain water down

pipe

≤ 3 m

Ø22mm

Ø 32mm

NB only combined foul/rainwater drain

7.7.1.8 Additional methods of introducing air breaks

2 3

1 Air break

2 Using a tundish

3 Using a pipe

7.7.1.9 Connection of condensate pump

Ø32mm

Ø22mm

≥ 3 m

Preferred option for external connection

0020244995_05 ecoTEC pro Installation and maintenance instructions 23

7.8 Flue installation

7.8.1 Installing and connecting the air/flue pipe

1. You can find out which air/flue pipes may be used by

consulting the enclosed set-up instructions for the

air/flue system.

2. Observe the information on positioning the air/flue ter-

minal.

Condition: Installation in damp rooms

▶ You must connect the product to a room-sealed air/flue

system. The combustion air must not be taken from the

installation site.

Caution.

Risk of poisoning due to escaping flue

gas.

Mineral-oil-based greases can damage the

seals.

▶ Instead of grease, use only water or com-

mercially available soft soap to aid install-

ation.

3. Install the air/flue pipe using the set-up instructions.

7.8.2 Replacing the connector for the air/flue pipe

as required

1. Replace the connector for the air/flue pipe as required.

The product-specific standard equipment is listed under

Technical data.

2. Remove the connection piece for the air/flue pipe – this

is installed at the factory. (→ Page 23)

3. If required, install the connection piece for the air/flue

pipe, 80/125 mm diameter. (→ Page 23)

7.8.2.1 Removing the connection piece for the

air/flue pipe

1. Insert a screwdriver into the slot between the measuring

stub pipes.

2. Press the screwdriver carefully down (1.).

3. Turn the connection piece anticlockwise (2.) as far as it

will go and then remove it by pulling it upwards (3.).

7.8.2.2 Installing the connection piece for the

air/flue pipe, 80/125 mm diameter

1. Remove the connection piece for the air/flue pipe – this

is installed at the factory. (→ Page 23)

2. Insert the alternative connection piece. In doing so, pay

attention to the latching lugs.

3. Turn the connection piece clockwise until it clicks into

position.

7.9 Electrical installation

The electrical installation must only be carried out by a quali-

fied electrician.

Danger!

Risk of death from electric shock!

Power supply terminals L and N remain live

even if the on/off button is switched off:

▶ 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).

▶ Secure against being switched back on

again.

▶ Wait for at least 3 minutes until the capa-

citors have discharged.

▶ Check that there is no voltage.

7.9.1 Opening the electronics box

▶ Open the electronics box as shown in the illustration.

7.9.2 Carrying out the wiring

Caution.

Risk of material damage caused by incor-

rect installation.

Mains voltage at incorrect terminals and plug

terminals may destroy the electronics.

▶ Do not connect any mains voltage to the

eBUS terminals (+/-).

▶ Only connect the mains connection cable

to the terminals marked for the purpose.

24 Installation and maintenance instructions ecoTEC pro 0020244995_05

1. Route the connection cables of the components to be

connected through the grommet provided on the under-

side of the product on the left.

2. Use strain reliefs.

3. If required, shorten the connection cables.

30 mm

≤

4. Strip the flexible line as shown in the figure. In doing so,

ensure that the insulation on the individual conductors

is not damaged.

5. Only strip inner conductors just enough to establish

good, sound connections.

6. To avoid short circuits resulting from loose individual

wires, fit conductor end sleeves on the stripped ends of

the conductors.

7. Screw the respective plug to the connection cable.

8. Check whether all conductors are sitting mechanically

securely in the terminals of the plug. Remedy this if

necessary.

9. Plug the plug into the associated PCB slot; see the wir-

ing diagram in the appendix.

7.9.3 Establishing the power supply

Caution.

Risk of material damage due to high con-

nected voltage.

At mains voltages greater than 253 V, elec-

tronic components may be damaged.

▶ Make sure that the rated voltage of the

mains is 230 V.

1. Observe all valid regulations.

2. Make sure that the nominal mains voltage is 230 V.

3. Provide one common power supply for the boiler and

for the corresponding control:

– Power supply: Single-phase, 230 V, 50 Hz

– Fuse protection: ≤ 3 A

4. Do not interrupt the mains supply with a time switch or

programmer.

5. Open the electronics box. (→ Page 23)

6. Connect the product using a fixed connection and an

electrical partition with a contact gap of at least 3 mm

(e.g. fuses or power switches).

7. Isolation should preferably be by a double pole

switched fused spur box having a minimum contact

separation of 3 mm on each pole. The fused spur box

should be readily accessible and preferably adjacent to

the boiler. It should be identified as to its use.

8. Route a three-core power supply cable that complies

with the relevant standards through the grommet and

into the product.

– Power supply cable: Flexible duct

9. Carry out the wiring. (→ Page 23)

10. Remove the supplied plug from the bracket in the elec-

tronics box and screw the plug onto the power supply

cable.

11. Close the electronics box.

12. Make sure that access to the power supply is always

available and is not covered or blocked.

7.9.4 Installing the product in a wet room

Danger!

Risk of death from electric shock!

If you install the product in a room with high

levels of moisture, e.g. a bathroom, observe

the nationally recognised technical standards

for electrical installations.

▶ Connect the product using a fixed con-

nection and an electrical partition with a

contact gap of at least 3 mm (e.g. fuses or

power switches).

▶ Use a flexible line for the power supply

cable, which is routed through the grom-

met into the product.

1. Open the electronics box. (

→ Page 23)

2. Detach the plug from the PCB slot for the power supply

(X1).

3. Use a suitable, three-core power supply cable that com-

plies with the relevant standards.

4. Carry out the wiring. (→ Page 23)

5. Close the electronics box.

6. Observe the flue-gas connection that is required on a

room-sealed air/flue system. (→ Page 23)

7.9.5 Connecting controls to the electronics

1. Install the control if necessary.

2. Open the electronics box. (→ Page 23)

3. Carry out the wiring. (→ Page 23)

4. Observe the wiring diagram in the appendix.

Condition: Connecting a weather-compensated control or a room temperat-

ure control via eBUS

▶ Connect the control to the eBUS connection.

▶

Bridge the 24 V = RT connection (X100 or X106), if there

is not already a bridge.

Condition: Connecting a low-voltage control (24 V)

▶ Remove the bridge and connect the control to the

24 V = RT connection (X100 or X106).

Condition: Connecting 230 volt controller

▶ Connect the switched live supply of your 230 V RT to the

RT marked X1 position (besides LNPE). Do NOT connect

the 230 V to any other terminal e.g. not to X106.

Condition: Connecting a limit thermostat for underfloor heating

▶ Remove the bridge and connect the limit thermostat to

the Burner off connection.

5. Close the electronics box.

6. For multi-circuit controls, change D.018 from Eco (inter-

mittently operating pump) to Comfort (continuously op-

erating pump). (→ Page 31)

0020244995_05 ecoTEC pro Installation and maintenance instructions 25

7.9.6 Connecting additional components via

VR 40 ("2 in 7" multi-functional module)

1. Install the components in accordance with the respect-

ive instructions.

Condition: Components connected to relay 1

▶ Activate D.027. (→ Page 31)

Condition: Components connected to relay 2

▶ Activate D.028. (→ Page 31)

7.9.7 Actuating the circulation pump according to

requirements

1. Carry out the wiring.

2. Connect the supply line for the external button using

terminals 1 (0) and 6 (functional drawing) on the X41

edge connector, which is supplied with the controller.

3. Plug the edge connector into the PCB slot X41.

26 Installation and maintenance instructions ecoTEC pro 0020244995_05

8 Operation

8.1 Operating concept

The operating concept and the display and setting facilities

of the operator level are described in the operating instruc-

tions.

An overview of the display and setting options in the installer

level can be found in the section "Overview of the installer

level". (→ Page 26)

8.2 Installer level overview

S.31

Code

D.---

P.--

--/--

8.3 Calling up the installer level

1. Only call up the installer level if you are a competent

person.

2. Press and ("i") at the same time.

◁ S.xx appears in the display (current unit status).

3. Press to access the installer level.

◁ Code and -- appear in the display.

4. Set the value 17 (code) and confirm by pressing .

5. Press to access the check programmes (P) and the

fault codes (F) and to return to the diagnostics codes

(D).

6. Use or to set the required value and confirm by

pressing .

7. Confirm by pressing ( ).

8. Press to cancel a setting or exit the installer level.

8.4 Live Monitor (status codes)

Menu → Live monitor

Status codes in the display provide information on the pro-

duct's current operating mode.

Status codes – Overview (→ Page 45)

8.5 Setting the hot water temperature

Danger!

Risk of death from legionella.

Legionella multiply at temperatures below

60 °C.

▶ Ensure that the end user is familiar with

all of the Anti-legionella measures in order

to comply with the applicable regulations

regarding legionella prevention.

▶ Set the hot water temperature.

Condition: Water hardness: > 3.57 mol/m³

– Water temperature: ≤ 50 ℃

0020244995_05 ecoTEC pro Installation and maintenance instructions 27

9 Start-up

9.1 Carrying out the initial start-up

Initial start-up must be carried out by a customer service

technician or an authorised competent person using the

Benchmark Checklist. The Benchmark Checklist in the ap-

pendix (→ Page 50) of the installation instructions must be

filled in and stored carefully along with the unit's documenta-

tion.

▶ Carry out the start-up procedure using the Benchmark

Checklist in the appendix.

▶ Fill out and sign the Benchmark Checklist.

9.2 Checking and treating the heating

water/filling and supplementary water

Caution.

Risk of material damage due to poor-qual-

ity heating water

▶ Ensure that the heating water is of suffi-

cient quality.

▶ Before filling or topping up the installation, check the

quality of the heating water.

Checking the quality of the heating water

▶ Remove a little water from the heating circuit.

▶ Check the appearance of the heating water.

▶ If you ascertain that it contains sedimentary materials,

you must desludge the installation.

▶ Use a magnetic rod to check whether it contains mag-

netite (iron oxide).

▶ If you ascertain that it contains magnetite, clean the in-

stallation and apply suitable corrosion-inhibition meas-

ures, or fit a magnetic filter.

▶ Check the pH value of the removed water at 25 °C.

▶ If the value is below 8.2 or above 10.0, clean the installa-

tion and treat the heating water.

▶ Ensure that oxygen cannot get into the heating water.

Checking the filling and supplementary water

▶ Before filling the installation, measure the hardness of the

filling and supplementary water.

Treating the filling and supplementary water

▶ Observe all applicable national regulations and technical

rules when treating the filling and supplementary water.

Provided the national regulations and technical rules do not

stipulate more stringent requirements, the following applies:

You must treat the heating water in the following cases

– If the entire filling and supplementary water quantity dur-

ing the operating life of the system exceeds three times

the nominal volume of the heating installation, or

– If the guideline values listed in the following table are not

met, or

– If the pH value of the heating water is less than 8.2 or

more than 10.0.

Total

heating

output

Water hardness at specific system volume

≤ 20 l/kW

> 20 l/kW

≤ 50 l/kW

> 50 l/kW

ppm

CaCO₃

mol/

m³

ppm

CaCO₃

mol/

m³

ppm

CaCO₃

mol/

m³

< 50 < 300 < 3 200 2 2 0.02

> 50

to ≤ 200

200 2 150 1.5 2 0.02

> 200

to ≤ 600

150 1.5 2 0.02 2 0.02

> 600 2 0.02 2 0.02 2 0.02

1) Nominal capacity in litres/heating output; in the case of multi-

boiler systems, the smallest single heating output is to be used.

Caution.

Risk of material damage if the heating

water is treated with unsuitable additives.

Unsuitable additives may cause changes in

the components, noises in heating mode and

possibly subsequent damage.

▶ Do not use any unsuitable antifreeze and

corrosion inhibitors, biocides or sealants.

No incompatibility with our products has been detected to

date with proper use of the following additives.

▶ When using additives, follow the manufacturer's instruc-

tions without exception.

We accept no liability for the compatibility of any additive or

its effectiveness in the rest of the heating system.

Additives for cleaning measures (subsequent

flushing required)

– Adey MC3+

– Adey MC5

– Fernox F3

– Sentinel X 300

– Sentinel X 400

Additives intended to remain permanently in the

installation

– Adey MC1+

– Fernox F1

– Fernox F2

– Sentinel X 100

– Sentinel X 200

Additives for frost protection intended to remain

permanently in the installation

– Adey MC ZERO

– Fernox Antifreeze Alphi 11

– Sentinel X 500

▶ If you have used the above-mentioned additives, inform

the end user about the measures that are required.

▶ Inform the end user about the measures required for frost

protection.

28 Installation and maintenance instructions ecoTEC pro 0020244995_05

9.3 Filling the condensate trap

1. Remove the lower section from the condensate trap (1).

2. Fill the lower section with water up to 10 mm below the

upper edge.

3. Attach the lower section to the condensate trap.

9.4 Switching the product on and off

▶ Press the on/off button on the product.

◁ The display shows the basic display.

9.5 Using check programmes

Call up the installer level + 1x

By activating various check programmes, you can trigger

special functions on the product.

Check programmes – Overview (→ Page 48)

9.6 Preventing low water pressure

To ensure that the heating installation operates smoothly,

the indicator on the pressure gauge must point to the upper

half of the grey area or to the middle of the bar graph display

in the display (marked by the dashed limit values) when the

heating installation is cold. This corresponds to a filling pres-

sure of between 0.1 MPa and 0.2 MPa (1.0 bar and 2.0 bar).

If the heating installation extends over several storeys,

higher filling pressures may be required to avoid air entering

the heating installation.

If the filling pressure falls below 0.08 MPa (0.8 bar), the

product indicates low pressure by displaying a flashing

pressure value. If the filling pressure falls below 0.05 MPa

(0.5 bar), the product switches off. The display shows F.22.

▶ Top up the heating water to start the product up again.

The pressure value flashes in the display until a pressure of

0.11 MPa (1.1 bar) or higher has been reached.

9.7 Flushing the heating installation for the first

time ("cold")

Note

The complete heating system must be flushed

at least twice: Once with cold water and once

with hot water in accordance with the following

instructions.

1. Check whether all thermostatic radiator valves and both

service valves on the product are open.

2. Connect a hose to the drain valve that is located at the

lowest position in the heating system.

3. Open the radiator valves and the drain valves so that

the water can drain quickly. Start at the next point in the

installation and open the purging valves on the radiators

so that the contaminated water can completely drain.

4. Close the draining cocks.

5. Refill the heating system with water.

6. Check that the expansion relief valve of the heating

system is functioning correctly by turning the handle

on the valve.

7. Check the pressure in the heating system and top up

with water if necessary.

8. Close the filling valve and the cold water tap.

9.8 Filling the heating installation

1. Flush the heating installation through.

2. Undo the cap of the automatic air vent (1) by one to two

rotations and leave it open, as the product purges itself

via the automatic air vent even in continuous mode.

3. Select the check programme P.06.

◁ The diverter valve moves to the mid-position, the

pumps do not run and the product does not switch

to heating mode.

4. Observe the information on treating heating water.

(→ Page 27)

5. Connect the filling and drainage tap in the heating in-

stallation to a heating water supply, if possible with the

cold water valve, in accordance with the relevant stand-

ards.

6. Open the heating water supply.

7. Open all radiator valves (thermostatic radiator valves) of

the heating installation.

8. If necessary, check that both service valves on the

product are open.

9. Slowly open the filling and drainage tap so that the wa-

ter flows into the heating system.

10. Purge the lowest radiator until water flows out of the

purging valve without bubbles.

11. Purge all other radiators until the entire heating system

has been filled with water.

0020244995_05 ecoTEC pro Installation and maintenance instructions 29

12. Close all purging valves.

13. Monitor the rising filling pressure in the heating installa-

tion.

14. Fill with water until the required filling pressure is

reached.

15. Close the filling and drainage tap and the cold water

valve.

16. Check all connections and the entire system for leaks.

9.9 Purging the heating installation

1. Select the check programme P.00.

◁ The product does not start up, the internal pump

operates intermittently and purges either the heating

circuit or the hot water circuit.

◁ The display shows the filling pressure of the heating

installation.

2. Make sure that the filling pressure of the heating install-

ation does not fall below the minimum filling pressure.

– ≥ 0.08 MPa (≥ 0.80 bar)

◁ At the end of the filling procedure, the filling pres-

sure of the heating installation should be at least

0.02 MPa (0.2 bar) above the counter-pressure

of the expansion vessel ("Exp") (P

Installation

≥ P

Exp

0.02 MPa (0.2 bar)).

3. If there is still too much air in the heating installation at

the end of the check programme P.00, repeat the check

programme.

9.10 Filling and purging the hot water system

1. Open the cold water stop valve on the product.

2. Fill the hot water system by opening all the hot water

draw-off valves until water escapes.

9.11 Gas inspection

9.11.1 Checking the factory-set gas setting

Caution.

Risk of material damage caused by mak-

ing unauthorised settings.

▶ Never modify the factory setting of the gas

pressure regulator of the gas valve.

▶ Before you start up the product, compare the gas group

information on the data plate with the gas group available

at the installation site.

Condition: The product design is not compatible with the local gas group

Only Vaillant Service may perform a gas conversion.

If a gas conversion to liquefied petroleum gas has been car-

ried out, the smallest possible partial load is higher than is

shown on the display. The correct values can be found in the

Technical data in the appendix.

▶ Call Vaillant Service (0330 1003 143).

▶ Do not start up the product.

Condition: The product design is compatible with the local gas group

▶ Proceed as described below.

9.11.2 Checking the air/flue pipe/flue gas

recirculation

1. Check the flue gas installation is intact in accordance

with the latest gas safe technical bulletin and informa-

tion supplied in the installation instructions.

2. For extended flue gas installations check for flue gas

recirculation using the air analysis point.

3. Use a flue gas analyser.

4. If you discover unusual levels of CO or CO

in the sup-

ply air, search for the leak in the flue system or for signs

of flue gas recirculation.

5. Eliminate the damage properly.

6. Check again whether the supply air contains any un-

usual levels of CO or CO

7. If you cannot eliminate the damage, do not start up the

product.

9.11.3 Checking the gas flow rate

The gas flow rate has been set during production and does

not require adjustment. With the front casing fitted check the

gas flow rate of the boiler as follows:

▶ Start up the product with the check programme P.01.

▶ In addition, ensure that maximum heat can be dissipated

into the heating system by turning up the room thermo-

stat.

▶ Wait at least 5 minutes until the boiler has reached its

operating temperature.

▶ Ensure that all other gas appliances in the property are

turned off.

▶ Measure the gas flow rate at the gas meter.

▶ Compare the measured values with the corresponding

values in the table.

H gas in m³/h P gas in kg/h

Qn,

DHW

nom.

Heatout-

put

DHW

Nom.

+5% -10%

Nom.

+5% -10%

18.9 18.5 2.00 2.10 1.80 1.47 1.54 1.32

23.5 23.0 2.49 2.61 2.24 1.83 1.92 1.64

24.5 24.0 2.59 2.72 2.33 1.90 2.00 1.71

27.8 27.2 2.94 3.09 2.65 2.16 2.27 1.94

Condition: Gas flow rate not in the permissible range

▶ Check all of the piping and ensure that the gas flow rates

are correct.

▶ Only put the product into operation once the gas flow

rates have been corrected.

Condition: Gas flow rate in the permissible range

▶ End the check programme P.01.

▶ Allow the boiler to cool down by allowing pump overrun to

operate for a minimum of 2 minutes.

▶ Record the boiler maximum gas flow rate onto the

Benchmark gas boiler commissioning checklist.

30 Installation and maintenance instructions ecoTEC pro 0020244995_05

9.11.4 Checking the gas flow pressure

1. Ensure that the gas inlet working pressure can be

obtained with all other gas appliances in the property

working.

2. Close the gas stopcock.

3. Use a screwdriver to undo the test nipple screw (1)

(lower screw) at the gas valve assembly.

4. Connect a manometer (2) to the test nipple (1).

5. Open the gas stopcock.

6. Start up the product with the check programme P.01.

7. In addition, ensure that maximum heat can be dissip-

ated into the heating system by turning up the room

thermostat.

8. With the boiler operating at full load check that the gas

inlet working pressure at the reference test point com-

plies with the requirements.

– Permissible gas flow pressure for operation with

natural gas H: 1.3 to 2.3 kPa (13.0 to 23.0 mbar)

– Permissible gas flow pressure for operation with

liquefied petroleum gas P: 2.3 to 4.3 kPa (23.0 to

43.0 mbar)

9. Should the pressure recorded at the reference test point

in the boiler be lower than indicated check if there is

any blockage in the pipework or if the pipework is un-

dersized.

Condition: Gas flow pressure not in the permissible range

Caution.

Risk of material damage and operating

faults caused by incorrect gas connection

pressure.

If the gas connection pressure lies outside

the permissible range, this can cause operat-

ing faults in and damage to the product.

▶ Do not make any adjustments to the

product.

▶ Do not start up the product.

▶

If you cannot correct the failure, notify the gas supply

company and proceed as follows:

▶ End the check programme P.01.

▶ Allow the boiler to cool down by allowing pump overrun to

operate for a minimum of two minutes.

▶ Close the gas stopcock.

▶ Remove the pressure gauge and retighten the sealing

screw (1) for the measuring nipple.

▶ Open the gas stopcock.

▶ Check the test nipple for gas tightness.

▶ Close the gas stopcock.

▶ Install the front casing.

▶ Disconnect the product from the power grid.

▶ You must not start up the boiler.

Condition: Gas flow pressure in the permissible range

▶ End the check programme P.01.

▶ Allow the boiler to cool down allowing pump overrun to

operate for a minimum of two minutes.

▶ Close the gas stopcock.

▶ Remove the pressure gauge and retighten the sealing

screw (1) for the measuring nipple.

▶ Open the gas stopcock.

▶ Check the test nipple for gas tightness.

▶ Install the front casing.

▶ Reset boiler controls for normal operation.

▶ Record the appliance gas inlet working pressure (kPa

resp. mbar) in the Benchmark gas boiler commissioning

checklist.

9.11.5 Checking the CO₂ content and, if necessary,

adjusting it (air index setting)

1. Start up the product with the check programme P.01.

2. Wait at least five minutes until the product reaches its

operating temperature.

3. Measure the CO₂ and CO/CO₂ content at the flue gas

analysis point.

4. Compare the measured value with the corresponding

value in the table.

Set values Unit Natural

gas H

Liquefied

petroleum

gas P

CO₂ after 5 minutes

in full load mode with

front casing closed

Vol% 9.2 ± 1.0 10.4 ± 0.5

CO₂ after 5 minutes

in full load mode with

front casing removed

Vol% 9.0 ± 1.0 10.2 ± 0.5

Set for Wobbe index

W₀

kWh/m³ 14.09 21.34

O₂ after 5 minutes in

full load mode with

front casing closed

Vol% 4.5 ± 1.8 5.1 ± 0.8

CO value with full load

ppm ≤ 250 ≤ 250

CO/CO₂

≤ 0.0031 ≤ 0.0026

0020244995_05 ecoTEC pro Installation and maintenance instructions 31

Condition: The CO₂ content must be adjusted

▶ Remove the yellow sticker.

▶ Remove the covering cap (1).

▶ Set the CO₂ content (value with front casing removed) by

turning the screw (2).

– Higher CO₂ content: Turn anti-clockwise

– Lower CO₂ content: Turn clockwise

▶ For natural gas only: Only perform the adjustment

in small increments of a 1/8 turn and wait approx.

one minute after each adjustment until the value

stabilises.

▶ For liquid gas only: Only perform the adjustment in ex-

tremely small increments (approx. 1/16 turn), and wait

approx. one minute after each adjustment until the value

stabilises.

▶ After you have implemented the settings, press ( ).

▶ If an adjustment is not possible in the specified adjust-

ment range, you must not start up the product.

▶ If this is the case, inform Customer Service.

▶ Refit the covering cap.

▶ Install the front casing.

9.12 Thoroughly flushing the heating installation

("hot")

1. Operate the appliance until the boiler and the heating

system are up to temperature.

2. Check the heating system for leaks.

3. Connect a hose to the drain valve located at the lowest

position of the heating system.

4. Shut off the boiler, open the drain valve and all purge

valves on the radiators and allow the water to flow out

of the heating system and the boiler quickly and fully.

5. Close the drain valve.

6. Fill the heating system again with water as described in

Filling the heating installation (→ Page 28) and Purging

the heating installation (→ Page 29).

7. Re-fill the system until the system design pressure of

0,1 MPa (1,0 bar) is attained.

Note

The actual reading on the digital pressure

gauge should ideally be 0,05 MPa (0,5 bar)

plus an additional pressure corresponding

to the highest point of the system above the

base of the boiler – 10 m head equals an ad-

ditional 1 bar reading on the pressure gauge.

The minimum pressure should not be less

than 0,1 MPa (1 bar) in any installation. If

the system is to be treated with an inhibitor it

should be applied at this stage in accordance

with the manufacturer’s instructions.

8. Install the front casing.

9.13 Checking leak-tightness

▶ Check the gas pipe, the heating circuit and the hot water

circuit for leak-tightness.

▶ Check that the air/flue pipe has been installed correctly.

Condition: Room-sealed operation

▶ Check whether the vacuum chamber has been closed

tightly.

9.13.1 Checking the heating mode

1. Make sure that there is a heat requirement.

2. Call up Live monitor.

◁ If the product is working correctly, the display shows

S.04.

9.13.2 Checking the hot water generation

1. Open a hot water valve all the way.

2. Call up Live monitor.

◁ If the hot water generation is working correctly, S.14

appears in the display.

10 Adapting the unit to the heating

installation

10.1 Calling up diagnostics codes

You can find the setting options in the diagnostics codes in

the installer level.

Overview of diagnostics codes (→ Page 41)

▶ Call up the installer level. (→ Page 26)

10.2 Burner anti-cycling time

To prevent frequent switching on and off of the burner and

thus prevent energy losses, an electronic restart lockout

is activated for a specific period each time the burner is

switched off. The burner anti-cycling time is only active

for the heating mode. Hot water handling during a burner

anti-cycling time does not affect the time function element

(default setting: 20 mins).

32 Installation and maintenance instructions ecoTEC pro 0020244995_05

10.2.1 Setting the burner anti-cycling time

1. Navigate to diagnostics code D.002 in the installer level

and confirm by pressing .

2. Set the burner anti-cycling time and confirm by pressing

Flow

(tar-

get)

[°C]

Set maximum burner anti-cycling time [min]

1 5 10 15 20 25 30

30 2.0 4.0 8.5 12.5 16.5 20.5 25.0

35 2.0 4.0 7.5 11.0 15.0 18.5 22.0

40 2.0 3.5 6.5 10.0 13.0 16.5 19.5

45 2.0 3.0 6.0 8.5 11.5 14.0 17.0

50 2.0 3.0 5.0 7.5 9.5 12.0 14.0

55 2.0 2.5 4.5 6.0 8.0 10.0 11.5

60 2.0 2.0 3.5 5.0 6.0 7.5 9.0

65 2.0 1.5 2.5 3.5 4.5 5.5 6.5

70 2.0 1.5 2.0 2.5 2.5 3.0 3.5

75 2.0 1.0 1.0 1.0 1.0 1.0 1.0

Flow

(target)

[°C]

Set maximum burner anti-cycling time

[min]

35 40 45 50 55 60

30 29.0 33.0 37.0 41.0 45.0 49.5

35 25.5 29.5 33.0 36.5 40.5 44.0

40 22.5 26.0 29.0 32.0 35.5 38.5

45 19.5 22.5 25.0 27.5 30.5 33.0

50 16.5 18.5 21.0 23.5 25.5 28.0

55 13.5 15.0 17.0 19.0 20.5 22.5

60 10.5 11.5 13.0 14.5 15.5 17.0

65 7.0 8.0 9.0 10.0 11.0 11.5

70 4.0 4.5 5.0 5.5 6.0 6.5

75 1.0 1.0 1.0 1.0 1.0 1.0

10.2.2 Resetting the remaining burner anti-cycling

time

▶ Press .

10.3 Setting the maintenance interval

1. Navigate to diagnostics code D.084 in the installer level

and confirm by pressing .

2. Set the maintenance interval (operating hours) until the

next maintenance work is due and confirm by pressing

Heat de-

mand

Number

of per-

sons

Guideline value for burner

operating hours until the

next inspection/maintenance

work is due for an average

operating time of one year

(dependent upon the system

type)

5.0 kW

1 ‑ 2 1050 h

2 ‑ 3 1150 h

10.0 kW

1 ‑ 2 1500 h

2 ‑ 3 1600 h

15.0 kW

2 ‑ 3 1800 h

3 ‑ 4 1900 h

Heat de-

mand

Number

of per-

sons

Guideline value for burner

operating hours until the

next inspection/maintenance

work is due for an average

operating time of one year

(dependent upon the system

type)

20.0 kW

3 ‑ 4 2600 h

4 ‑ 5 2700 h

25.0 kW

3 ‑ 4 2800 h

4 ‑ 6 2900 h

> 27.0 kW

3 ‑ 4 3000 h

4 ‑ 6 3000 h

10.4 Setting the pump output

1. Navigate to diagnostics code D.014 in the installer level

and confirm by pressing .

2. Set the required pump output.

Condition: Low loss header installed

▶ Switch off the speed regulation and set the pump output

to a fixed value.

10.4.1 Remaining pump head

10.4.1.1 Pump curve for VUW 246, VUW 286

400

300

200

100

150

250

350

200 400 600 800 1000 1200 1400

Remaining feed head

[hPa]

Flow rate

[

l/hr

]

100% PWM

80%

70%

60%

53%

10.5 Setting the bypass valve

Caution.

Risk of material damage caused by incor-

rect setting of the high-efficiency pump

If the pressure at the bypass valve is in-

creased (by turning it clockwise) and the

pump output is set to less than 100%, the

product may not operate correctly.

▶ In this case, set the pump output to

5 = 100% using diagnostics code D.014.

▶ Remove the front casing. (→ Page 18)

0020244995_05 ecoTEC pro Installation and maintenance instructions 33

▶ Regulate the pressure using the adjusting screw (1).

Position of the

adjusting screw

Pres-

sure

in MPa

(mbar)

Notes/application

Right-hand stop

(turned all the

way down)

0.035

(350)

If the radiators do not heat

up sufficiently at the default

setting. In this case, you

must set the pump to the

maximum speed.

Mid-position

(5 turns to the

left)

0.025

(250)

Default setting

5 further turns to

the left from the

mid-position

0.017

(170)

If noises are produced in

the radiators or radiator

valves

▶ Install the front casing.

11 Handing over to the end user

▶ At the time of commissioning complete all relevant sec-

tions of the Benchmark commissioning checklist, located

at the rear of this document.

▶ For IE: Complete a “Declaration of Conformity” to indicate

compliance to I.S. 813. An example of this is given in the

current edition of I.S. 813.

▶ When you have finished the installation, affix the en-

closed sticker (which requests that the user reads the

instructions) to the front of the product in the end user's

language.

▶ Draw attention, to the current issue of the Gas Safety

(Installation and Use) Regulations, Section 35, which

imposes a duty of care on all persons who let out any

property containing a gas appliance in the UK.

▶ Explain to the end user how the safety devices work and

where they are located.

▶ Inform the end user how to handle the product.

▶ In particular, draw attention to the safety warnings that

the end user must follow.

▶ Inform the end user that they must have the product

maintained in accordance with the specified intervals.

▶ Pass all of the instructions and documentation for the

product to the end user for safe-keeping.

▶ Inform the end user about measures taken to ensure

the supply of combustion air and flue gas guiding, and

instruct the operator that he must not make any changes.

▶ Inform the end user that they must not store or use explo-

sive or highly flammable substances (such as petrol, pa-

per or paint) in the installation room of the product.

▶ Complete and sign off the Benchmark commissioning

check list.

▶ Complete and sign off the guarantee documentation.

34 Installation and maintenance instructions ecoTEC pro 0020244995_05

12 Inspection and maintenance

12.1 Complete Service Interval Record section

▶ After servicing, complete the relevant Service Interval

Record section of the Benchmark Checklist located on

the inside back pages of this document.

12.2 Using original seals

If you replace components, use only the enclosed original

seals; additional sealing materials are not required.

12.3 Inspection and maintenance

▶ You must carry out an annual inspection of the product.

The annual inspection can be effectively performed

without removing components by requesting data from

the DIA system, carrying out the simple visual checks in-

dicated in the table in the appendix and performing a flue

gas measurement. The maintenance intervals and their

scope are determined by the heating engineer based on

the condition of the boiler found during the inspection. All

inspection and maintenance work should be performed in

the order specified in the table in the appendix.

During any inspection and maintenance or after change

of parts of the combustion circuit, the following must be

checked:

– The boiler has been installed in accordance with the rel-

evant installation instructions.

– The integrity of the flue gas installation and flue seals is

in accordance with the relevant flue installation instruc-

tions enclosed.

– Visual, the integrity of the boiler combustion circuit and

relevant seals (paying particular attention to the burner

door seal).

– The gas inlet working pressure at maximum rate.

– The gas flow rates.

– Correctness of electrical, water and gas connections.

– Correctness of the water pressure.

– The condition of the whole system, in particular the con-

dition of radiator valves, evidence of leakage from the

heating system and dripping taps.

▶ Correct any faults before proceeding.

12.4 Preparing the maintenance work

1. Switch off the product.

2. Disconnect the product from the power grid.

3. Remove the front casing. (→ Page 18)

4. Close the gas stopcock.

5. Close the service valves in the heating flow and in the

heating return.

6. Close the service valve in the cold water pipe.

7. Drain the product to clean hydraulic components

(→ Page 36).

8. Ensure that water does not drip on live components

(e.g. the electronics box).

9. Use only new seals and o'ring. Do not use additional

compounds.

12.5 Removing the compact thermal module

Note

The compact thermal module consists of four

main components:

– Speed-regulated fan,

– Gas/air connection,

– Gas supply (mixture pipe) with burner flange,

– Premix burner.

Danger!

Risk of death and risk of material damage

caused by hot flue gas.

The seal, insulating mat and self-locking nuts

on the burner flange must not be damaged.

Otherwise, hot flue gases may escape and

cause personal injury and material damage.

▶ Replace the seal each time you open the

burner flange.

▶ Replace the self-locking nuts on the

burner flange each time you open the

burner flange.

▶ If the insulating mat on the burner flange

or on the back wall of the heat exchanger

shows signs of damage, replace the insu-

lating mat.

1. Switch off the product using the on/off button.

2. Close the gas stopcock.

3. Remove the front casing. (→ Page 18)

4. Hinge the electronics box forward.

5. Unscrew the retaining screw (2) and remove the air

intake pipe (1) from the intake stub.

6. Unscrew either the union nut on the gas valve assembly

(3) or the union nut (4) between the gas pipes.

0020244995_05 ecoTEC pro Installation and maintenance instructions 35

7. Remove the ignition line plug (5) and the earth wire plug

(6) from the ignition electrode.

8. Remove the plug (3) from the fan motor.

9. Remove the plug (4) from the gas valve assembly.

10. Unscrew the four nuts (7).

11. Remove the entire compact thermal module (2) from

the heat exchanger (1).

12. Check the burner and the heat exchanger for damage

and dirt.

13. If necessary, clean or replace the components accord-

ing to the following sections.

14. Fit a new burner flange seal.

15. Check the insulating mat on the burner flange and on

the back panel of the heat exchanger. If you notice any

signs of damage, replace the relevant insulating mat.

12.6 Cleaning the heat exchanger

1. Protect the folded down electronics box against sprayed

water.

2. Never undo the four nuts on the stud bolt (1) or tighten

them.

3. Clean the heating coil (3) of the heat exchanger (4) us-

ing water or, if required, vinegar (to a maximum of 5%

acid). Allow the vinegar to act on the heat exchanger for

20 minutes.

4. Rinse away any loose dirt with a sharp jet of water or

use a plastic brush. Do not point the water jet directly

at the insulating mat (2) on the back of the heat ex-

changer.

◁ The water flows out of the heat exchanger through

the condensate siphon.

12.7 Checking the burner

1. Check the surface of the burner (1) for damage. If you

see any damage, replace the burner.

2. Fit a new burner flange seal (3).

3. Check the insulating mat (2) on the burner flange. If you

notice any signs of damage, replace the insulating mat.

12.8 Cleaning the condensate trap

1. Remove the lower section from the condensate trap (1).

2. Flush out the lower section with water.

3. Fill the lower section with water up to about 10 mm be-

low the upper edge.

4. Attach the lower section to the condensate trap.

12.9 Cleaning the filter in the cold water inlet

Validity: Product with integrated hot water generation

1. Close the cold water stop valve.

2. Drain the product on the hot water side.

3. Unscrew the cap nut (2) and the lock nut (1) from the

product's casing.

36 Installation and maintenance instructions ecoTEC pro 0020244995_05

4. Tilt the electronics box forward.

5. Remove the clamp (2).

6. Remove the pipe (1) from the product.

7. Rinse the filter under a jet of water, holding it against

the direction of flow.

8. If the filter is damaged or it can no longer be cleaned

sufficiently, you must replace the filter.

9. Refit the pipe.

10. Reinsert the clamp.

11. Always use new seals and retighten the cap nuts and

the lock nut.

12. Open the cold water stop valve.

12.10 Installing the compact thermal module

1. Connect the compact thermal module (2) to the heat

exchanger (1).

2. Tighten the four nuts (7) in a cross-wise pattern until the

burner flange fits closely and uniformly onto the mating

surfaces.

– Tightening torque: 6 Nm, if a torque spanner is

available

3. Connect the plugs (3) to (6) again.

4. Connect the gas pipe using a new seal. In the process,

secure the gas pipe against twisting.

5. Open the gas stopcock.

6. Make sure that there are no leaks.

7. Check that the sealing ring in the air intake pipe is posi-

tioned correctly in the seal seat.

8. Reconnect the air intake pipe to the intake stub.

9. Secure the air intake pipe with the retaining screw.

10. Check the gas flow pressure.

12.11 Draining the product

1. Close the service valves of the product.

2. Start the check programme P.06 (diverter valve mid-

position).

3. Open the drain valves.

4. Make sure that the cap of the automatic air vent on

the internal pump is open so that the product can be

drained fully.

12.12 Checking the pre-charge pressure for the

internal expansion vessel

1. Close the service valves and drain the product.

2. Measure the pre-charge pressure of the expansion ves-

sel at the vessel valve.

Condition: Pre-charge pressure < 0.075 MPa (0.75 bar)

▶ Ideally, you should top up the expansion vessel with ni-

trogen. Otherwise, top it up with air. Ensure that the drain

valve is open when topping up.

3. If water escapes from the valve of the expansion

vessel, you must replace the expansion vessel.

(→ Page 39)

4. Fill the heating installation. (→ Page 28)

5. Purge the heating installation. (→ Page 29)

12.13 Checking the filling pressure of the heating

installation

1. Check the filling pressure of the heating installation, top

it up with heating water, if necessary, and purge it.

2. Fill the heating installation. (→ Page 28)

3. Purge the heating installation. (→ Page 29)

12.14 Checking the quality of the heating water

▶ Check the quality of the heating water: Clarity (clouding),

correct inhibitor and pH value. (→ Page 27)

12.15 Completing inspection and maintenance

work

▶ Start a test operation after the maintenance.

▶ Check the heating mode and, if required, the domestic

hot water generation (if available).

▶ Check the gas flow pressure. (→ Page 30)

▶ Check the CO₂ content and, if necessary, adjust it (air

index setting). (→ Page 30)

▶

If required, reset the maintenance interval. (→ Page 32)

▶ Install the front casing.

▶ Fill out the relevant Service Record section in the Bench-

mark Checklist.

0020244995_05 ecoTEC pro Installation and maintenance instructions 37

12.16 Checking the product for leak-tightness

▶ Check that the product is leak-tight. (→ Page 31)

13 Troubleshooting

13.1 Checking service messages

appears if you have set a maintenance interval, for ex-

ample, and this has passed or a service message is issued.

The product is not in fault mode.

▶ Call up the Live Monitor. (→ Page 26)

Condition: S.46 is displayed

The product is in Comfort protection mode. The product con-

tinues to run with restricted comfort after it has detected a

fault.

▶ To establish whether or not a component is defective,

read the fault memory. (→ Page 37)

Note

If no fault message is present, the product will

automatically switch back to normal operating

mode after a certain time.

13.2 Eliminating faults

▶ If fault messages are displayed (F.XX), eliminate the fault

after checking the table in the appendix.

Check programmes – Overview (→ Page 48)

Overview of fault codes (→ Page 46)

If several faults occur at the same time, the display shows

the corresponding fault messages for two seconds each in

alternation.

▶ Press (max. three times) to restart the product.

▶ If you are unable to eliminate the fault and the fault re-

curs despite reset attempts, contact customer service.

13.3 Calling up and clearing the fault memory

The last 10 fault messages are stored in the fault memory.

▶ Call up the installer level. (→ Page 26)

▶ Navigate to the fault codes.

◁ The number of faults that have occurred is shown in

the display and the faults that are currently called up

are displayed with their fault numbers F.xx.

▶ Press or to call up individual fault messages.

▶ To delete the entire fault list, navigate to diagnostics code

D.094 in the installer level.

▶ Set the diagnostics code to 1, and confirm by pressing

13.4 Resetting parameters to factory settings

1. Navigate to diagnostics code D.096 in the installer level.

2. Set the diagnostics code to 1, and confirm by pressing

13.5 Preparing the repair work

1. Decommission the product.

2. Disconnect the product from the power mains.

3. Remove the front casing. (→ Page 18)

4. Close the gas isolator cock.

5. Close the service valves in the heating flow and in the

heating return.

6. Close the service valve in the cold water pipe.

7. Drain the product if you want to replace water-bearing

components of the product.

8. Make sure that water does not drip on live components

(e.g. the electronics box).

9. Use only new seals.

13.5.1 Procuring spare parts

The original components of the product were also certified

by the manufacturer as part of the declaration of conformity.

If you use other, non-certified or unauthorised parts during

maintenance or repair work, this may void the conformity of

the product and it will therefore no longer comply with the

applicable standards.

We strongly recommend that you use original spare parts

from the manufacturer as this guarantees fault-free and safe

operation of the product. To receive information about the

available original spare parts, contact the contact address

provided on the back page of these instructions.

▶ If you require spare parts for maintenance or repair

work, use only the spare parts that are permitted for the

product.

13.6 Replacing defective components

13.6.1 Replacing the burner

1. Remove the compact thermal module. (

→ Page 34)

2. Undo the four screws (1) on the burner.

3. Remove the burner.

4. Install a new seal (2) on the new burner.

5. Install the compact thermal module. (→ Page 36)

38 Installation and maintenance instructions ecoTEC pro 0020244995_05

13.6.2 Replacing the fan or gas valve

1. Remove the air intake pipe.

2. Remove the plug from the gas valve (7).

3. Remove the plug from the fan motor (6) by pushing in

the latching lug.

4. Unscrew either the cap nut (2) on the gas valve or the

cap nut (8) between the gas pipes. Secure the gas pipe

against twisting.

5. Unscrew the three screws (2)-(4) between the mixture

pipe (1) and the fan flange.

6. Remove the entire fan/gas valve unit from the product.

7. If you want to replace the gas valve, unscrew the cap

nut (2) if the gas pipe is still secured to the gas valve.

8. Unscrew both fixing screws (1) on the gas valve and

remove the fan from the gas valve.

9. Replace the defective fan or the defective gas valve.

10. Install the gas valve and the fan in the same position as

before. Use new seals.

11. Screw the fan to the gas valve.

12. If you had removed the gas pipe, screw the cap nut

of the gas pipe (2) only loosely to the gas valve. Only

tighten the cap nut on the gas valve after the installa-

tion work has been completed.

13. Refit the entire fan/gas valve unit in reverse order. You

must use a new seal (5) for this.

14. Ensure that the order in which the three screws are

screwed in between the fan and the mixture pipe cor-

responds to the numbering (3), (2) and (4).

15. Tighten the cap nut (2) on the gas valve and the cap

nut (8) between the gas pipes. In the process, secure

the gas pipe against twisting. Use new seals.

16. After you have completed this work, carry out a leak-

tightness test (function check). (→ Page 31)

17. If you have installed a new gas valve, adjust the gas

ratio setting. (→ Page 29)

13.6.3 Replacing the heat exchanger

1. Drain the product. (→ Page 36)

2. Remove the compact thermal module. (→ Page 34)

3. Detach the condensate drain hose from the heat ex-

changer.

4. Remove the clamps (2) and (3) from the flow connec-

tion and the return connection.

5. Detach the flow connection.

6. Detach the return connection.

7. Remove two screws (1) on each of the two retainers.

8. Remove the lower three screws (2) on the rear section

of the retainer.

9. Swing the retainer to the side around the top screw (1).

10. Pull the heat exchanger downwards and to the right,

and remove it from the product.

11. Install the new heat exchanger in reverse order.

12. Replace the seals.

0020244995_05 ecoTEC pro Installation and maintenance instructions 39

Note

Instead of grease, use only water or com-

mercially available soft soap to aid installa-

tion.

13. Insert the flow and return connections into the heat

exchanger as far as they will go.

14. Make sure that the brackets are seated correctly on the

flow and return connections.

15. Install the compact thermal module. (→ Page 36)

16. Fill and purge the product and, if necessary, the heating

installation. (→ Page 28)

13.6.4 Replacing the expansion vessel

1. Drain the product. (→ Page 36)

2. Undo the screwed connection (4).

3. Remove both screws (1) on the support plate (2).

4. Remove the support plate (2).

5. Pull out the expansion vessel (3) towards the front.

6. Insert the new expansion vessel into the product.

7. Screw the new expansion vessel to the water connec-

tion. Use a new seal for this.

8. Attach the support plate using both screws (1).

9. Fill and purge the product and, if necessary, the heating

installation. (→ Page 28)

13.6.5 Replacing the PCB or the display

Note

If you only replace one component, when the

product is switched on, the new component ad-

opts the parameters that were previously set from

the component that was not replaced.

1. Open the electronics box. (→ Page 23)

2. Replace the PCB or display according to the assembly

and installation instructions supplied.

3. Close the electronics box.

13.6.6 Replacing the PCB and the display

1. Open the electronics box. (→ Page 23)

2. Replace the PCB and display according to the

assembly and installation instructions supplied.

3. Close the electronics box.

4. Press the on/off button on the product. (→ Page 28)

◁ You are automatically taken to D.093 to set the

device specific number.

5. Set the correct value for the relevant product type in ac-

cordance with the table below and confirm by pressing

Product type number

VUW 246/5-3 (H-GB) ecoTEC pro

VUW 286/5-3 (H-GB) ecoTEC pro

VUW 286/5-3 (P-GB) ecoTEC pro

◁ The electronics are now set to the product type and

the parameters of all diagnostics codes are set to

default settings.

6. Make the system-specific settings.

13.7 Completing repair work

1. Establish the power supply.

2. Switch the product back on if this has not yet been

done. (→ Page 28)

3. Install the front casing.

4. Open all service valves and the gas stopcock.

13.8 Checking the product for leak-tightness

▶ Check that the product is leak-tight. (→ Page 31)

14 Decommissioning

14.1 Temporarily decommissioning the product

▶ Press the on/off button.

◁ The display goes out.

▶ Close the gas stopcock.

▶ On combination products and products with a connec-

ted domestic hot water cylinder, you must also close the

cold-water isolation valve.

14.2 Permanently decommissioning the product

▶ Press the on/off button.

◁ The display goes out.

▶ Disconnect the product from the power grid.

▶ Close the gas stopcock.

▶ Close the cold-water isolation valve.

▶ Drain the product. (→ Page 36)

15 Recycling and disposal

Disposing of the packaging

▶ Dispose of the packaging correctly.

▶ Observe all relevant regulations.

▶ For detailed information refer to www.vaillant.co.uk.

40 Installation and maintenance instructions ecoTEC pro 0020244995_05

Appendix

A Inspection and maintenance work

The table below lists the manufacturer requirements with respect to minimum inspection and maintenance intervals. If na-

tional regulations and directives require shorter inspection and maintenance intervals, you should observe these instead of

the intervals listed. Each time inspection and maintenance work is carried out, carry out the required preparatory and com-

pletion work.

# Maintenance work Interval

1 Record all of the analysis results in the Benchmark Checklist in these

instructions

Annually

2 Ask the end user whether any significant problems occur when operating

the product

Annually

3 Use the diagnostics system to check the product's fault history Annually

4 Visually inspect whether the air/flue pipe and its opening have been in-

stalled correctly in accordance with the set-up instructions

Annually

5 Check that the unit has been installed correctly and the connections have

been secured

Annually

6 Check that the condensate pipe is in good condition, that it is leak-tight

and that the drain is correct

Annually

7 Check whether all of the externally routed condensate pipes are dimen-

sioned correctly and have been insulated sufficiently (frost protection)

Annually

8 Check whether the gas flow rate corresponds with the specifications on

the data plate and lies within the tolerances specified in these instructions

Annually

9 If the gas flow rate lies outside of the tolerances specified in these in-

structions, eliminate the fault in accordance with the regulations and the

current technology

Annually

10 Check the general condition of the product and, if required, eliminate any

faults that are found

Annually

11 Carry out the combustion analysis: Measure the CO content, CO₂ content

and the CO/CO₂ ratio. For products with a rear air/flue connection: The

combustion analysis can only be carried out when the unit casing has

been removed; it is not necessary to test these products for flue gas recir-

culation

Annually

12 Check the product's recirculation at the supply air test point on the air/flue

pipe. If required, inspect the entire air/flue system and, if necessary, cor-

rect the fault

Annually

13 Disconnect the product from the electrical installation Annually

14 Check and, if required, correct the electrical installation Annually

15 Removing dirt from the product and the vacuum chamber Annually

16 Visually check the heat cell to ascertain its condition and detect any cor-

rosion, rust or damage, and carry out maintenance work, if required

Annually

17 Check that the gas stopcock and service valves function correctly Annually

18 Check the quality of the heating water: Clarity (clouding), correct inhibitor

and pH value

Annually

19 Removing the compact thermal module at regular intervals

20 Check the burner for damage at regular intervals

21 Checking the insulating mats in the combustion area and replacing dam-

aged insulating mats

at regular intervals

22 Cleaning the heat exchanger at regular intervals

23 Cleaning the condensate trap Annually

24 Filling the condensate trap Annually

25 Installing the compact thermal module at regular intervals

26 Checking the pre-charge pressure for the internal expansion vessel at regular intervals

27 Cleaning the filter in the cold water inlet at regular intervals

28 Check the impeller sensor for dirt/damage at regular intervals

29 If the water volume is insufficient (domestic hot water) or the outlet tem-

perature is insufficient, check the secondary heat exchanger

at regular intervals

30 Reassemble the product After each time maintenance

work is carried out

31 Opening the service valves Annually

0020244995_05 ecoTEC pro Installation and maintenance instructions 41

# Maintenance work Interval

32 Filling the heating installation at regular intervals

33 Completing inspection and maintenance work Annually

34 Visually check the ignition and burner behaviour Annually

35 Check the CO content, CO₂ content and the CO/CO₂ ratio again Annually

36 Checking leak-tightness Each time maintenance work is

carried out 31

B Overview of diagnostics codes

Note

Since the code table is used for various products, some codes may not be visible for the product in question.

Code Parameter Values or explanations

Factory

setting

Own setting

D.000 Heating partial load Adjustable partial heat load in kW

Auto: Product automatically adjusts max. partial load to

current system demand

Auto

D.001 Pump overrun: Heating 1 to 60 min 5 min

D.002 Max. anti-cycl. time: Heating 2 to 60 min 20 min

D.003 Outlet temperature actual value In °C Not ad-

justable

D.004 Cylinder temperature actual value In °C Not ad-

justable

D.005 Heating target flow temperature In °C; the maximum value that is set in D.071 and is

restricted by means of an eBUS control if such a control

is connected

Not ad-

justable

D.006 Outlet temperature target value 35 to 65 ℃ Not ad-

justable

D.007 Comfort mode target value

APC target value

Cylinder temperature target value

Product with integrated domestic hot water generation,

and product with integrated domestic hot water genera-

tion and shift-load cylinder

35 to 65 ℃

Product with heating mode only

Frost protection is at 15 °C, then 40 to 70 °C (max.

temperature can be adjusted under D.020)

Not ad-

justable

D.008 Controller 3-4 Room thermostat open (no heat requirement)

Room thermostat closed (heat requirement)

Not ad-

justable

D.009 eBUS controller target value In °C Not ad-

justable

D.010 Internal pump On, Off Not ad-

justable

D.011 External pump On, Off Not ad-

justable

D.012 Cyl. charging pump On, Off Not ad-

justable

D.013 Circulation pump On, Off Not ad-

justable

D.014 Pump speed target value Target value of internal high-efficiency pump in %. Pos-

sible settings:

0 = Auto

1 = 53

2 = 60

3 = 70

4 = 85

5 = 100

0 = Auto

D.015 Pump speed actual value Actual value for internal high-efficiency pump in % Not ad-

justable

D.016 Controller 24 V DC: Heating mode Heating mode off/on Not ad-

justable

42 Installation and maintenance instructions ecoTEC pro 0020244995_05

Code Parameter Values or explanations

Factory

setting

Own setting

D.017 Control type Control type:

0 = Flow, 1 = Return

Return: Automatic detection function for heat output

inactive. Max. possible partial heat load when D.000

is on Auto.

0 = Flow

D.018 Pump operating mode 1 = Comfort (continuously operating pump)

Internal pump is switched on when the heating flow tem-

perature is not at Heating off and the heat requirement

is enabled via an external control

3 = Eco (intermittently operating pump)

Internal pump is switched on every 25 minutes for 5

minutes once the overrun time has elapsed

3 = Eco

D.019 Pump operating mode: 2-stage

pump

Setting for two-stage pump operating mode

0: Burner mode stage 2, pump prerun/overrun stage 1

1: Heating mode and pump prerun/overrun stage 1,

domestic hot water mode stage 2

2: Automatic heating mode, pump prerun/overrun

stage 1, domestic hot water mode stage 2

3: Always stage 2

4: Automatic heating mode, pump prerun/overrun

stage 1, domestic hot water mode stage 1

D.020 Max. DHW temperature target

value

Adjustment range: 50–70 °C (actoSTOR 65 °C) 65 °C

D.022 DHW demand On, Off Not ad-

justable

D.023 Heating mode status Heating on, heating off (summer mode) Not ad-

justable

D.025 Ext. eBUS signal: Cylinder char-

ging

On, Off Not ad-

justable

D.026 Auxiliary relay 1 = Circulation pump

2 = External pump

3 = Cylinder charging pump

4 = Extraction hood

5 = External solenoid valve

6 = External fault message

7 = Solar pump (not active)

8 = eBUS remote control (not active)

9 = Anti-legionella pump (not active)

10 = Solar valve (not active)

2 = External

pump

D.027 Accessory relay 1 Switching of relay 1 on the VR 40 "2 in 7" multi-func-

tional module

1 = Circulation pump

2 = External pump

3 = Cylinder charging pump

4 = Extraction hood

5 = External solenoid valve

6 = External fault message

7 = Solar pump (not active)

8 = eBUS remote control (not active)

9 = Anti-legionella pump (not active)

10 = Solar valve (not active)

2 = External

pump

0020244995_05 ecoTEC pro Installation and maintenance instructions 43

Code Parameter Values or explanations

Factory

setting

Own setting

D.028 Accessory relay 2 Switching of relay 2 on the VR 40 "2 in 7" multi-func-

tional module

1 = Circulation pump

2 = External pump

3 = Cylinder charging pump

4 = Extraction hood

5 = External solenoid valve

6 = External fault message

7 = Solar pump (not active)

8 = eBUS remote control (not active)

9 = Anti-legionella pump (not active)

10 = Solar valve (not active)

2 = External

pump

D.029 Water circulation vol. actual value Actual value in m³/h Not ad-

justable

D.033 Fan speed target value In rpm Not ad-

justable

D.034 Fan speed actual value In rpm Not ad-

justable

D.035 3-way valve position Heating mode

Parallel operation (mid-position)

DHW mode

Not ad-

justable

D.036 DHW flow rate In l/min Not ad-

justable

D.039 Solar inlet temp. actual value Actual value in °C Not ad-

justable

D.040 Flow temperature actual value Actual value in °C Not ad-

justable

D.041 Return temperature actual value Actual value in °C Not ad-

justable

D.044 Ionisation value actual value Display field 0 to 1020

> 800 no flame

< 400 good flame

Not ad-

justable

D.046 Pump mode 0 = Relay with disable facility

1 = PWM with disable facility

0 = Relay

with disable

facility

D.047 Current outside temperature (with Vaillant weather-compensated control)

Actual value in °C

Not ad-

justable

D.050 Offset min. speed In rpm, adjustment range: 0 to 3000 Nominal

value set in

factory

D.051 Offset max. speed In rpm, adjustment range: -990 to 0 Nominal

value set in

factory

D.058 Solar post-heating 0 = Solar post-heating deactivated

3 = DHW activation target value minimum 60 °C, thermo-

static mixing valve required between product and draw-

off point

0 = Solar

post-heating

deactivated

D.060 Number of safety therm. shut-

downs

Number of shutdowns Not ad-

justable

D.061 No. of shut-downs in ign. flame

controller

Number of unsuccessful ignitions in the last attempt Not ad-

justable

D.064 Avg. ignition time In seconds Not ad-

justable

D.065 Max. ignition time In seconds Not ad-

justable

D.067 Remaining anti-cycl. time for heat-

ing

In minutes Not ad-

justable

D.068 Number of first start attempts Number of unsuccessful ignitions Not ad-

justable

D.069 Number of second start attempts Number of unsuccessful ignitions Not ad-

justable

44 Installation and maintenance instructions ecoTEC pro 0020244995_05

Code Parameter Values or explanations

Factory

setting

Own setting

D.070 3-way valve operation 0 = Normal operating mode

1 = Parallel operation (mid-position)

2 = Permanent heating position

0 = Normal

operating

mode

D.071 Max. heating target flow temp. 40 to 80 ℃ 75 ℃

D.072 Pump overrun after cylinder char-

ging

Adjustable from 0–10 minutes in increments of 1 minute 2 mins

D.073 Offset setting for comfort mode Adjustable from -15 K to 5 K 0

D.074 Anti-legionella funct. with integ-

rated cyl.

0 = Off

1 = On

D.075 Max. cylinder charging time 20–90 min 45 mins

D.076 Device Specific Number Device specific number = DSN

30 = VUW 246/5-3 (H-GB) ecoTEC pro 24

32 = VUW 286/5-3 (H-GB) ecoTEC pro 28; VUW 286/5-3

(P-GB) ecoTEC pro 28

26 = ecoTEC pro 30 H combi A VUW GB 306/5-3

Not ad-

justable

D.077 DHW partial load Adjustable cylinder charging output in kW

D.078 DHW max. flow temperature Limit on cylinder charging temperature in °C

50 °C – 80 °C

Note

The chosen value must be at least 15 K or 15 °C above

the target cylinder value.

75 °C

D.080 Heating operating hours In hours (h) Not ad-

justable

D.081 DHW operating hours In hours (h) Not ad-

justable

D.082 Heating burner starts Number of burner start-ups Not ad-

justable

D.083 DHW burner starts Number of burner start-ups Not ad-

justable

D.084 Maintenance in Adjustment range: 0 to 3000 hrs and "---" for deactivated „---”

D.088 Min. DHW flow rate Switch-on delay for domestic hot water draw-off detec-

tion via impeller (only products with integrated domestic

hot water generation)

0 = 1.5 l/min and no delay,

1 = 3.7 l/min and 2 sec. delay

1.5 l/min and

no delay

D.090 eBUS controller Status of digital control

Recognised, not recognised

Not ad-

justable

D.091 Status DCF77 Status of DCF with outdoor temperature sensor connec-

ted

No reception

Reception

Synchronised

Valid

Not ad-

justable

D.092 actoSTOR communication status actoSTOR module detection

0 = Not connected

1 = Connection fault: No communication via PeBus,

actoSTOR module was previously detected

2 = Connection active

Not ad-

justable

D.093 Adjust Device Specific Number Device Specific Number (DSN)

Adjustment range: 0 to 99

D.094 Clear fault history Delete fault list

0 = No

1 = Yes

D.095 Software version: PeBUS parti-

cipant

PCB (BMU)

Display (AI)

actoSTOR (APC)

HBI/VR34

Not ad-

justable

D.096 Reset to factory settings? Reset all adjustable parameters to factory setting

0 = No

1 = Yes

0020244995_05 ecoTEC pro Installation and maintenance instructions 45

C Status codes – Overview

Note

Since the code table is used for various products, some codes may not be visible for the product in question.

Code Meaning

S.00 Heating: No heat de-

mand

Heating has no heat demand. The burner is off.

S.01 Heating mode: Fan start-

The fan start-up for heating mode is activated.

S.02 Heating mode: Pump

pre-run

The pump prerun for heating mode is activated.

S.03 Heating mode: Ignition The ignition for heating mode is activated.

S.04 Heating mode: Burner

The burner for heating mode is activated.

S.05 Heating mode: Pump/fan

overrun

The pump/fan overrun for heating mode is activated.

S.06 Heating mode: Fan over-

run

The fan overrun for heating mode is activated.

S.07 Heating mode: Pump

overrun

The pump overrun for heating mode is activated.

S.08 Heating mode: Anti-cyc-

ling time

The anti-cycling time for heating mode is activated.

S.10 DHW demand The domestic hot water demand is activated.

S.11 DHW mode: Fan start-up The fan start-up for domestic hot water mode is activated.

S.13 DHW mode: Ignition The ignition for domestic hot water mode is activated.

S.14 DHW mode: Burner on The burner for domestic hot water mode is activated.

S.15 DHW mode: Pump/fan

overrun

The pump/fan overrun for domestic hot water mode is activated.

S.16 DHW mode: Fan overrun The fan overrun for domestic hot water mode is activated.

S.17 DHW mode: Pump over-

run

The pump overrun for domestic hot water mode is activated.

S.20 DHW demand The domestic hot water demand is activated.

S.21 DHW mode: Fan start-up The fan start-up for domestic hot water mode is activated.

S.22 DHW mode: Pump pre-

run

The pump prerun for domestic hot water mode is activated.

S.23 DHW mode: Ignition The ignition for domestic hot water mode is activated.

S.24 DHW mode: Burner on The burner for domestic hot water mode is activated.

S.25 DHW mode: Pump/fan

overrun

The pump/fan overrun for domestic hot water mode is activated.

S.26 DHW mode: Fan overrun The fan overrun for domestic hot water mode is activated.

S.27 DHW mode: Pump over-

run

The pump overrun for domestic hot water mode is activated.

S.28 DHW anti-cycling time The anti-cycling time for domestic hot water mode is activated.

S.30 No heat demand: Con-

troller

Room thermostat blocks heating mode.

S.31 No heat demand: Sum-

mer mode

Summer mode is activated; there is no heat demand.

S.32 Waiting time deviation:

Fan speed

The waiting period for the fan start-up is activated.

S.34 Heating mode: Frost pro-

tection

The frost protection function for heating mode is activated.

S.39 Contact thermostat

triggered

The surface-mounted thermostat or the condensate pump has triggered.

S.40 Comfort protection act-

ive

The comfort protection mode is activated.

S.41 Water pressure too high The system pressure is too high.

S.42 Flue non-return flap

closed

Flue non-return flap return signal blocks burner operation (only in conjunction with the multi-functional

module) or condensate pump defective, heat demand is blocked.

46 Installation and maintenance instructions ecoTEC pro 0020244995_05

Code Meaning

S.46 Comfort protection: Min-

imum load, loss of flame

Comfort protection mode for flame loss at minimum load is activated.

S.53 Waiting time: Water

shortage

The product is within the waiting period of the modulation block/operating block function as a result of

a water deficiency (flow/return spread too large).

S.54 Waiting time: Water

shortage

Product is in the waiting period of the operation blocking function as a result of low water pressure

(temperature gradient).

S.57 Waiting time: Measuring

program

The product is within the waiting period as a result of the measuring programme.

S.58 Burner modulation limit-

ation

The burner modulation limitation is activated.

S.61 Fault: Incorrect gas type The coding resistor on the PCB does not match the entered gas group (see also F.92).

S.62 Adjust CO2 Set the CO

content.

S.63 Fault: Check gas route A fault message is activated. Check the gas route.

S.76 Service message: Check

water pressure

A service message is activated. Check the water pressure.

S.88 Purging programme is

running

The purge programme is activated.

S.92 Water circulation volume

self-test

The self-test for the water circulation volume is activated.

S.93 Flue gas measurement

not possible

Flue gas analysis is not currently possible.

S.96 Return temperature

sensor self-test

The self-test for the return temperature sensor is activated.

S.97 Water pressure sensor

self-test

The self-test for the water pressure sensor is activated.

S.98 Flow/return temperature

sensor self-test

The self-test for the flow/return temperature sensor is activated.

S.99 Vaillant self-test The Vaillant self-test is activated.

D Overview of fault codes

Note

Since the code table is used for various products, some codes may not be visible for the product in question.

Code/meaning Possible cause Measure

F.00 Interruption: Flow sensor Flow temperature sensor de-

fective or not connected

▶ Check: Flow temperature sensor, plug, cable harness, PCB.

F.01 Interruption: Return sensor Return temperature sensor de-

fective or not connected

▶ Check: Return temperature sensor, plug, cable harness, PCB.

F.10 Short circuit: Flow sensor Flow temperature sensor de-

fective or has short-circuited

▶ Check: NTC plug, cable harness, cable/housing, PCB, NTC

sensor.

F.11 Short circuit: Return

sensor

Return temperature sensor de-

fective or has short-circuited

▶ Check: NTC plug, cable harness, housing, PCB, NTC sensor.

F.20 Safety switch-off: Temper-

ature limiter

Maximum temperature at the

flow/return temperature sensor

is too high when the safety cut-

out function is operating using

the NTC

▶ Check: Flow temperature sensor (correct thermal connection),

cable harness, sufficient purging.

F.22 Safety switch-off: Low wa-

ter pressure

No/insufficient water in the

product or the water pressure is

too low

1. Check: Plug, cable to heating pump or water pressure

sensor, water pressure sensor, heating pump.

2. Activate and purge check programme P.0.

F.23 Safety switch-off:

Temp.spread too large

Temperature spread too great.

Water circulation too low

▶ Check: Plug, cable to heating pump/water pressure sensor,

air/insufficient water in the heating circuit, flow and return tem-

perature sensor inverted, strainer in the hydraulic block, water

pressure sensor, heating pump (sufficient circulation, level 2:

D.19, D.14, non-return valve). Activate check programme P.0.

F.24 Safety switch-off: Temp.

incr. too fast

Temperature increase too fast ▶ Check: Plug, cable to the heating pump, air/insufficient water

in the heating circuit, internal air vent (function), heating pump

(system pressure too low, temperature gradient too great on

heating flow, non-return valve). Activate check programme P.0.

0020244995_05 ecoTEC pro Installation and maintenance instructions 47

Code/meaning Possible cause Measure

F.25 Safety switch-off: Flue

temp. too high

flue gas temperature too high ▶ Check: Plug, safety cut-out plug, cable harness, cable to the

heating pump, internal air vent (function), flue gas route (block-

age, adverse wind conditions, flue pipework too long), insuf-

ficient water in heating circuit, heating pump, activate check

programme P.0.

F.26 Fault: Fuel valve not work-

ing

Gas valve assembly stepper

motor defective or not connec-

ted

▶ Check: Gas valve assembly stepper motor (plug, cable, pas-

sage for rinsing, voltage), multiple plug, cable harness.

F.27 Safety switch-off: Flame

simulation

Monitoring electrode reports an

incorrect flame

▶ Check: Gas pressure at upper test opening, monitoring elec-

trode, PCB, gas solenoid valve.

F.28 Start-up failure: Ignit. un-

successful

Failure during start-up or igni-

tion unsuccessful. Gas pressure

monitor or thermal cut-out has

been triggered.

▶ Check: Gas stopcock, gas flow pressure, gas valve assembly,

air intake pipe (blockage, loosened screw), condensate route

(blockage), multiple plug, cable harness, ignition transformer,

ignition cable, ignition plug, ignition electrode, monitoring elec-

trode, electronics, earthing, CO₂ setting.

F.29 Operating failure: Ignit.

unsuccessful

Gas supply interrupted intermit-

tently. Re-ignition failed.

▶ Check: Flue gas recirculation, condensate route (blockage),

earthing, cable to the gas valve assembly and electrode (loose

connection).

F.32 Fault: Fan Fan defective or not connected ▶ Check: Plug, cable harness, fan (blockage, function, correct

speed), Hall sensor, PCB, flue gas route (blockage).

F.49 Fault: eBUS Undervoltage on the eBUS ▶ Check: eBUS (overload, two power supplies with different po-

larities, short circuit).

F.61 Fault: Fuel valve actuation The gas valve assembly cannot

be actuated

▶ Check: Cable harness, plug, gas valve assembly (rinse), PCB.

F.62 Fault: Fuel valve switch-off

delay

Delayed switch-off sequence for

the gas valve after the flame is

extinguished

▶ Check: Gas valve, surface of the burner (dirt), plug, cable har-

ness, PCB.

F.63 Fault: EEPROM EEPROM faulty ▶ Replace: PCB.

F.64 Fault: Electronics/sensor Electronics, safety-relevant

sensor or cable defective

▶ Check: Flow sensor, cable to the sensor, flame recording

sensor (e.g. ionisation electrode) for an unstable signal,

electronics.

F.65 Fault: Electronics temp. Electronics defective or too hot

due to external influences

1. Check: PCB.

2. If required, reduce the environmental temperature.

F.67 Fault: Electronics/flame Implausible flame signal ▶ Check: Cable harness, flame monitor, PCB.

F.68 Fault: Flame signal un-

stable

Flame monitor reports an un-

stable flame signal

▶ Check: Air ratio, gas flow pressure, condensate route (block-

age), gas injector, ionisation flow (cable, electrode), flue gas

recirculation.

F.70 Fault: Invalid Device Spe-

cific Number

Incorrect/missing Device

Specific Number or

incorrect/missing coding resistor

▶ If the display and PCB have been replaced, change the Device

Specific Number under D.93.

F.71 Fault: Flow sensor Flow temperature sensor re-

turns implausible values

▶ Check: Flow temperature sensor (correct thermal connection).

F.72 Fault: Flow/return sensor Temperature difference

between flow and return

temperature sensor is too great

▶ Check: Flow temperature sensor/return temperature sensor

(function, correct thermal connection).

F.73 Fault: Water press. sensor

(signal too weak)

Water pressure sensor reports

that the water pressure is too

low

▶ Check: Water pressure, earth connection, cable, plug, water

pressure sensor (short circuit to GDN).

F.74 Fault: Water press. sensor

(signal too strong)

Water pressure too high 1. Drain water.

2. Check the water pressure sensor.

F.75 Fault: Pump/ water short-

age

Insufficient pressure jump de-

tected when starting the pump

1. Check: Water pressure sensor, heating pump (blockage),

heating circuit (air, sufficient water volume), adjustable by-

pass, external expansion vessel (must be connected at the

return). Activate check programme P.0.

2. If a low loss header or heating pipes with a diameter greater

than 1 1/2 inch are installed, replace the 3/4-inch seal in the

heating flow with a screen. If required, install the F.75 service

set.

F.77 Fault: Flue non-ret.

valve/condens. pump

No flue non-return flap feed-

back; condensate pump over-

flow

▶ Check: Cable to VR40 accessory, flue non-return flap (wiring,

feedback switch), condensate pump, bridge from the surface-

mounted thermostat, 2 in 7 multi-functional module (bridge).

F.78 Interrupt.: DHW outlet

sensor on ext. contr.

UK link box is connected

without the domestic hot water

temperature sensor being

bridged

1. Check: Accessory (configuration/electrical connection).

2. The unit displays a fault, but the unit has not malfunctioned.

48 Installation and maintenance instructions ecoTEC pro 0020244995_05

Code/meaning Possible cause Measure

F.83 Fault: NTC temp. gradient Temperature difference

between flow and return

temperature sensor is too small

▶ Check: Flow/return temperature sensor (function, correct

thermal connection), sufficient water volume.

F.84 Fault: NTC temp. diff. im-

plausible

Temperature difference is im-

plausible

▶ Check: Flow/return temperature sensor (correct thermal con-

nection, sensors are inverted).

F.85 Fault: NTCs fitted incor-

rectly

Flow/return temperat-

ure sensors returning

incorrect/implausible values

▶ Check: Flow/return temperature sensor (correct thermal con-

nection).

Communication fault Communication fault between

the display and the PCB in the

electronics box

▶ Check: Cable/plug between the display and the PCB.

E Check programmes – Overview

Check programme Meaning

P.00 Purging The internal pump is cyclically actuated. The heating circuit and the domestic hot water circuit are ad-

aptively purged by automatically switching the circuits using the automatic air vent (the automatic air

vent's cap must be loose). The active circuit is shown in the display. Press once to start purging

the heating circuit. Press once to end the purge programme. Note: The purge programme runs for

7.5 min per circuit and then terminates. Purging the heating circuit: Prioritising diverter valve in heat-

ing position, actuation of internal pump for 9 cycles: 30 sec. on, 20 sec. off. Display: Active heating

circuit. Purging the domestic hot water circuit: After the above-mentioned cycles have run or the right-

hand selection button has been pressed again: Prioritising diverter valve in the domestic hot water

position, actuation of the internal pump as above. Display: Active domestic hot water circuit.

P.01 Maximum load After successful ignition, the product is operated at maximum heat input.

P.02 Minimum load After successful ignition, the product is operated at minimum heat input.

P.06 Filling mode The prioritising diverter valve is moved to the mid-position. The burner and pump are switched off (to

fill or drain the product).

0020244995_05 ecoTEC pro Installation and maintenance instructions 49

F Wiring diagrams

F.1 Product connection diagram with integrated hot water generation

X18

X51

X20

24V

230V~

24V

230V~

X41

X22

Masse

PWM

Hallsignal

+24V

Burner Off BUSRT 24V

X106

X30

X40 X51 X35

X31

X22

X90

Fuse

X12

X18

CH Pump

B.off RT BUS

X106

X20

X41

X51

1 Main PCB

2 Operator control panel PCB

3 Outside temperature sensor, flow temperature

sensor (optional, external), DCF receiver

4 Circulation pump remote control

5 Gas valve

6 Return temperature sensor

7 Flow temperature sensor

8 Fan

09 Contact thermostat/burner off

10 24 V DC room thermostat

11 Bus connection (digital room thermostat/controller)

12 Diverter valve

13 Water pressure sensor

14 Impeller sensor

15 Warm start sensor

16 Internal pump

17 Ignition electrode

* Depending on product type

50 Installation and maintenance instructions ecoTEC pro 0020244995_05

G Commissioning Checklist

www.centralheating.co.uk

* All installations in England and Wales must be notied to Local Authority Building Control (LABC) either directly or through a

Competent Persons Scheme. A Building Regulations Compliance Certicate will then be issued to the customer.

www.hhic.co.uk

Benchmark Commissioning &

Warranty Validation Service Record

It is a requirement that the boiler is installed and commissioned to the manufacturers’

instructions and the data elds on the commissioning checklist completed in full.

To instigate the boiler warranty the boiler needs to be registered with the

manufacturer within one month of the installation. The warranty rests with the

end-user (consumer), and they should be made aware it is ultimately their

responsibility to register with the manufacturer, within the allotted time period.

It is essential that the boiler is serviced in line with the manufacturers’

recommendations, at least annually. This must be carried out by a competent Gas

Safe registered engineer. The service details should be recorded on the Benchmark

Service and Interim Boiler Work Record and left with the householder. Failure to

comply with the manufacturers’ servicing instructions and requirements will invalidate

the warranty.

This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating

compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference.

Failure to install and commission according to the manufacturers’ instructions and complete this Benchmark Commissioning Checklist will invalidate the

warranty. This does not affect the customer’s statutory rights.

0020244995_05 ecoTEC pro Installation and maintenance instructions 51

www.centralheating.co.uk

GAS BOILER SYSTEM COMMISSIONING CHECKLIST & WARRANTY VALIDATION RECORD

Address:

Boiler make and model:

Boiler serial number:

Commissioned by (PRINT NAME): Gas Safe registration number:

Company name: Telephone number:

Company email: Company address:

Commissioning date:

Heating and hot water system complies with the appropriate Building Regulations? Yes

Boiler Plus requirements (tick the appropriate box(s))

Boiler Plus option chosen for combination boiler in ENGLAND

Weather compensation Smart thermostat with automisation and optimisation

Load compensation Flue Gas Heat Recovery

Time and temperature control to hot water Cylinder thermostat and programmer/timer Combination boiler

Zone valves pre-existing Fitted Not required

Thermostatic radiator valves pre-existing Fitted Not required

Automatic bypass to system pre-existing Fitted Not required

pre-existing Fitted Not required

Water quality

instructions Yes

What system cleaner was used? Brand: Product:

What inhibitor was used? Brand: Product:

pre-existing Fitted Not required

CENTRAL HEATING MODE measure and record (as appropriate)

Gas rate (for combination boilers complete DHW mode gas rate) m

hr or ft

/hr

Central heating output left at factory settings? Yes No

If no, what is the maximum central heating output selected? kW

Dynamic gas inlet pressure mbar

°C

Central heating return temperature °C

System correctly balanced/rebalanced? Yes

COMBINATION BOILERS ONLY

Is the installation in a hard water area (above 200ppm)? Yes No

Water scale reducer/softener pre-existing Fitted Not required

Brand: Product:

Yes N o

If yes- DHW expansion vessel pre-existing Fitted Not required

Pressure reducing valve pre-existing Fitted Not required

DOMESTIC HOT WATER MODE Measure and record

Gas rate m

hr or ft

/hr

Dynamic gas inlet pressure at maximum rate mbar

Cold water inlet temperature °C

Hot water has been checked at all outlets Yes Temperature °C

CONDENSATE DISPOSAL

The condensate drain has been installed in accordance with the manufacturers’ instructions and/or BS5546/BS6798 Yes

Point of termination Internal External (only where internal termination impractical)

Method of disposal Gravity Pumped

ALL INSTALLATIONS

Record the following

At max rate: CO ppm CO

%CO/CO

Ratio

At min rate (where possible) CO ppm CO

%CO/CO

Ratio

instructions, and readings are correct? Yes

The operation of the boiler and system controls have been demonstrated to and understood by the customer Yes

The manufacturers’ literature, including Benchmark Checklist and Service Record, has been explained and left with the customer Yes

Commissioning Engineer’s signature

Customer’s signature

Time, temperature control and boiler interlock provided for central heating and hot water Yes

52 Installation and maintenance instructions ecoTEC pro 0020244995_05

www.centralheating.co.uk

SERVICE & INTERIM BOILER WORK RECORD

It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service /

interim work record is completed.

Service provider

When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’ instructions. Always use the

SERVICE/INTERIM WORK ON BOILER delete as appropriate

Date:

Engineer name: Company name:

Telephone N

: Gas Safe registration N

Max rate CO ppm CO

% CO/CO

Min rate CO ppm CO

% CO/CO

undertaken in accordance with manufacturers’

instructions, and readings are correct?”

yes

Gas rate: m

/h OR ft

delete as appropriate Yes No

System inhibitor concentration has been checked and

appropriate action taken, in accordance with BS 7593

and boiler manufacturers’ instructions. *

yes n/a

Comments:

Signature:

instructions and BS 7593. It is only acceptable to not have undertaken this if the service engineers

attendance visit was in between annual services to attend a non-water facing component.