Vaillant VUW 286/5-3, VUW 246/5-3, VU 126/5-5, VU 246/5-5, VU 156/5-5 Installation And Maintenance Instructions Manual

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Installation and maintenance instructions

ecoTEC pro

VUW ..6/5-3

GB, IE

Publisher/manufacturer Vaillant GmbH

Berghauser Str. 40 D-42859 Remscheid Tel. +49 21 91 18‑0 Fax +49 21 91 18‑2810 info@vaillant.de www.vaillant.de

Contents

2 Installation and maintenance instructions ecoTEC pro 0020244995_02

Contents

1 Safety .................................................................... 4

1.1 Action-related warnings ......................................... 4

1.2 Intended use.......................................................... 4

1.3 General safety information .................................... 4

1.4 Related documents................................................ 6

1.5 Related documents................................................ 7

2 Notes on the documentation .............................. 8

2.1 Observing other applicable documents ................. 8

2.2 Storing documents................................................. 8

2.3 Applicability of the instructions .............................. 8

2.4 Benchmark............................................................. 8

3 Product description............................................. 8

3.1 Product design....................................................... 8

3.2 Information on the identification plate.................... 8

3.3 Serial number ........................................................ 9

3.4 CE label ................................................................. 9

3.5 Energy Saving Trust Endorsed Products .............. 9

3.6 Hot Water Association ........................................... 9

4 Set-up.................................................................... 9

4.1 Unpacking the product........................................... 9

4.2 Checking the scope of delivery.............................. 9

4.3 Transporting the product ..................................... 10

4.4 Dimensions.......................................................... 10

4.5 Minimum clearances............................................ 11

4.6 Using the installation template............................. 11

4.7 Wall-mounting the product................................... 11

4.8 Removing the front casing................................... 11

4.9 Removing the side section .................................. 12

5 Installation.......................................................... 12

5.1 Installation requirements ..................................... 12

5.2 Installing the gas connection ............................... 13

5.3 Checking the gas line for leak-tightness.............. 13

5.4 Installing the hot and cold water connection........ 13

5.5 Connecting the heating flow and heating

return ................................................................... 13

5.6 Connecting the condensate drain pipework ........ 14

5.7 Installing the discharge pipe on the expansion

relief valve............................................................ 14

5.8 Flue installation.................................................... 14

5.9 Electrical installation ............................................ 15

6 Operation............................................................ 17

6.1 Operating concept ............................................... 17

6.2 Installer level overview......................................... 17

6.3 Calling up the installer level ................................. 17

6.4 Live Monitor (status codes) ................................. 17

6.5 Setting the hot water temperature ....................... 18

7 Start-up ............................................................... 18

7.1 Carrying out the initial start-up............................. 18

7.2 Switching the product on and off ......................... 18

7.3 Using check programmes.................................... 18

7.4 Checking and treating the heating water/filling

and supplementary water .................................... 18

7.5 Preventing low water pressure ............................ 19

7.6 Flushing the heating installation for the first

time ("cold") ......................................................... 19

7.7 Filling the heating installation .............................. 19

7.8 Purging the heating installation ........................... 20

7.9 Filling and purging the hot water system ............. 20

7.10 Filling the condensate trap .................................. 20

7.11 Gas inspection ..................................................... 20

7.12 Checking leak-tightness ...................................... 22

7.13 Thoroughly flushing the heating installation

("hot")................................................................... 22

8 Adapting the unit to the heating

installation.......................................................... 23

8.1 Calling up diagnostics codes ............................... 23

8.2 Burner anti-cycling time ....................................... 23

8.3 Setting the maintenance interval ......................... 23

8.4 Setting the pump output....................................... 24

8.5 Setting the bypass valve...................................... 24

8.6 Handing the product over to the operator............ 24

9 Troubleshooting ................................................ 25

9.1 Checking service messages................................ 25

9.2 Eliminating faults.................................................. 25

9.3 Calling up and clearing the fault memory ............ 25

9.4 Resetting parameters to factory settings ............. 25

9.5 Preparing the repair work .................................... 25

9.6 Replacing defective components......................... 25

9.7 Completing repair work........................................ 27

9.8 Checking the product for leak-tightness .............. 27

10 Inspection and maintenance ............................ 27

10.1 Removing the compact thermal module .............. 28

10.2 Cleaning the heat exchanger............................... 28

10.3 Checking the burner ............................................ 29

10.4 Cleaning the condensate trap.............................. 29

10.5 Cleaning the filter in the cold water inlet.............. 29

10.6 Installing the compact thermal module ................ 29

10.7 Draining the product ............................................ 30

10.8 Checking the pre-charge pressure for the

internal expansion vessel .................................... 30

10.9 Completing inspection and maintenance work .... 30

10.10 Checking the product for leak-tightness .............. 30

11 Decommissioning.............................................. 30

11.1 Temporarily decommissioning the product.......... 30

11.2 Decommissioning the product ............................. 30

12 Recycling and disposal..................................... 30

13 Customer service............................................... 30

Appendix ............................................................................31

A Overview of diagnostics codes........................ 31

B Status codes – Overview .................................. 35

C Overview of fault codes .................................... 36

D Check programmes – Overview ....................... 38

E Wiring diagrams................................................. 39

E.1 Product connection diagram with integrated

hot water generation............................................ 39

F Inspection and maintenance work................... 40

Contents

0020244995_02 ecoTEC pro Installation and maintenance instructions 3

G Commissioning Checklist................................. 41

H Opening of the flue pipe.................................... 45

H.1 Positioning of the opening of a fan-supported

flue gas pipe ........................................................ 45

I Horizontal terminal positioning........................ 46

J Opening of the flue pipe below eaves and

balconies ............................................................ 46

K Technical data.................................................... 47

Index ...................................................................................50

1 Safety

4 Installation and maintenance instructions ecoTEC pro 0020244995_02

1 Safety

1.1 Action-related warnings

Classification of action-related warnings

The action-related warnings are classified in accordance with the severity of the possible danger using the following warning signs and signal words:

Warning symbols and signal words

Danger!

Imminent danger to life or risk of severe personal injury

Danger!

Risk of death from electric shock

Warning.

Risk of minor personal injury

Caution.

Risk of material or environmental damage

1.2 Intended use

There is a risk of injury or death to the user or others, or of damage to the product and other property in the event of improper use or use for which it is not intended.

The product is intended as a heat generator for closed heating installations and for hot water generation.

Depending on the gas-fired boiler type, the products referred to in these instructions must only be installed and operated in conjunction with the air/flue pipe accessories listed in the other applicable documents.

Intended use includes the following:

– observance of accompanying operating,

installation and servicing instructions for the product and any other system components

– installing and fitting the product in accord-

ance with the product and system approval

– compliance with all inspection and main-

tenance conditions listed in the instructions.

Intended use also covers installation in accordance with the IP code.

Any other use that is not specified in these instructions, or use beyond that specified in

this document shall be considered improper use. Any direct commercial or industrial use is also deemed to be improper.

Caution.

Improper use of any kind is prohibited.

1.3 General safety information

1.3.1 Risk caused by inadequate qualifications

The following work must only be carried out by competent persons who are sufficiently qualified to do so:

– Set-up – Dismantling – Installation – Start-up – Inspection and maintenance – Repair – Decommissioning

▶ Observe all instructions that are included

with the product.

▶ Proceed in accordance with current tech-

nology.

▶ Observe all applicable directives, stand-

ards, laws and other regulations.

1.3.2 Risk of death from escaping gas

What to do if you smell gas in the building:

▶ Avoid rooms that smell of gas. ▶ If possible, open doors and windows fully

and ensure adequate ventilation.

▶ Do not use naked flames (e.g. lighters,

matches).

▶ Do not smoke. ▶ Do not use any electrical switches, mains

plugs, doorbells, telephones or other communication systems in the building.

▶ If it is safe to do so, close the emergency

control valve or the main isolator.

▶ If possible, close the gas isolator cock on

the product.

▶ Warn other occupants in the building by

yelling or banging on doors or walls.

▶ Leave the building immediately and ensure

that others do not enter the building.

▶ Notify the gas supply company or the Na-

tional Grid +44 (0) 800 111999 by tele-

Safety 1

phone once you are outside of the building.

1.3.3 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 line under any circumstance.

1.3.4 Risk of death due to blocked or leaking flue gas routes

Installation errors, damage, tampering, unauthorised installation sites or similar can cause flue gas to escape and result in a risk of poisoning.

What to do if you smell flue gas in the property:

▶ Open all accessible doors and windows

fully to provide ventilation.

▶ Switch off the product. ▶ Check the flue gas routes in the product

and the flue gas diversions.

1.3.5 Risk of poisoning and burns caused by escaping hot flue gases

▶ Only operate the product if the air/flue pipe

has been completely installed.

▶ With the exception of short periods for

testing purposes, only operate the product when the front casing is installed and closed.

1.3.6 Risk of death due to explosive and flammable materials

▶ Do not use the product in storage rooms

that contain explosive or flammable substances (such as petrol, paper or paint).

1.3.7 Risk of death due to cabinet-type casing

Cabinet-type casing can give rise to dangerous situations when used on a product which is operated with an open flue.

0020244995_02 ecoTEC pro Installation and maintenance instructions

▶ Ensure that the product is supplied with

sufficient combustion air.

1.3.8 Risk of poisoning caused by insufficient combustion air supply

Conditions: Open-flued operation

▶ Ensure that the air supply to the product's

installation room is permanently unobstructed and sufficient in accordance with the relevant ventilation requirements.

1.3.9 Risk of death due to lack of safety devices

The schematic drawings included in this document do not show all safety devices required for correct installation.

▶ Install the necessary safety devices in the

system.

▶ Observe the applicable national and inter-

national laws, standards and guidelines.

1.3.10 Risk of death from electric shock

There is a risk of death from electric shock if you touch live components.

Before commencing work on the product:

▶ Disconnect the product from the power

supply by switching off all power supplies at all poles (electrical partition with a contact gap of at least 3 mm, e.g. fuse or circuit breaker).

▶ Secure against being switched back on

again.

▶ Check that there is no voltage.

1.3.11 Risk of being burned or scalded by

hot components

▶ Only carry out work on these components

once they have cooled down.

1.3.12 Risk of death from escaping flue

gas

If you operate the product with an empty condensate trap / siphon, then flue gas may escape into the room air.

▶ In order to operate the product, ensure that

the condensate trap / siphon is always full.

1 Safety

6 Installation and maintenance instructions ecoTEC pro 0020244995_02

1.3.13 Risk of material damage caused by using an unsuitable tool

▶ Use the correct tool to tighten or loosen

threaded connections.

1.3.14 Risk of material damage caused by frost

▶ Do not install the product in rooms prone

to frost.

1.3.15 Risk of corrosion damage due to unsuitable combustion and room air

Sprays, solvents, chlorinated cleaning agents, paint, adhesives, ammonia compounds, dust or similar substances may lead to corrosion on the product and in the flue gas guiding.

▶ Ensure that the supply of combustion air is

always free of fluorine, chlorine, sulphur, dust, etc.

▶ Ensure that no chemical substances are

stored at the installation site.

▶ If you are installing the product in

hairdressing salons, painter's or joiner's workshops, cleaning businesses or similar locations, choose a separate installation room in which the room air is technically free of chemical substances.

1.4 Related documents

Installation and maintenance of the boiler must only be performed by a competent person with valid accreditation from the Health and Safety Executive in accordance with the "Gas Safety (Installation and Use) Regulations 1998" (hereinafter abbreviated to "competent person" or "heating specialist company"). The existing regulations, rules and guidelines must be observed when doing so. Any special requirements of Local Authorities, gas undertakings or insurers must be complied with. The competent person is also responsible for inspection, maintenance and repairs to the boiler, and for checking gas volume setting and flue gas analysis.

Installers shall carryout a full site risk assessment and put into place all necessary steps and procedures to comply with Health and safety at work act and ensure safety of

themselves and others with regard to manual handling and working at height requirements.

During the appliance installation (and any subsequent work, such as, the replacement of major parts ) it will be necessary to employ caution. All installers and operatives involved from unloading the appliance until it is fully mounted on the wall in its final installed location must exercise full duty of care for themselves and others with regard to safety. When lifting and handling this appliance, operatives should employ assistance. In certain situations it may be necessary to use mechanical handling aids. Take care to avoid trip hazards, slippery or wet surfaces.

Employers and installers should refer to the HSE web site for full advice and manual handling assessment charts (MAC) tool.

In addition where no specific instructions are given then reference shall be made, but not restricted to, all applicable and relevant British Standards and codes of practice such as the following:

– Gas Safety (Installation and Use) regula-

tions.

– All current Building Regulations for Eng-

land, Northern Ireland and Wales, (as amended). This includes Approved Codes of Practice and approved documents and guidance for building regulations. (A to P and 7)

– The Building Standards, Scotland, and

any requirements determined by the local authorities within.

– The Health and safety at work act – COSHH Control of Substances Hazardous

to Health.

– BS 7671 Requirements for electrical in-

stallations. IEE Wiring Regulations

– The Electricity at Work Regulations. – The Water supply (water fittings) regula-

tions 1999.

– Water bylaws 2000 (Scotland) – BS 5854 Code of practice for flues and flue

structures in buildings.

– BS EN 12828 Design of water-based heat-

ing systems.

– BS EN 806 Parts 1 - 5.

Safety 1

0020244995_02 ecoTEC pro Installation and maintenance instructions 7

– BS 8558 Guide to the design, installation,

testing and maintenance of services supplying water for domestic use within buildings and their curtilages.

– BS 6880 Code of practice for low temper-

ature heating systems with outputs above 45 kW, Part 1, 2, and 3.

– BS 6891 Installation of low pressure gas

pipe work of up to 35mm in domestic premises.

– BS 4814 Specification for: Expansion

vessels using an internal diaphragm, for sealed hot water and heating systems.

– BS 7074 Application, selection and install-

ation of expansion vessels and ancillary equipment for sealed water systems., Part 1 and 2.

– BS 7593 Code of practice for treatment of

water in domestic hot water central heating systems.

– BS 12831 Heating systems in buildings.

Method for calculating design heat load.

– BS EN 13831 Closed expansion vessels

with built in diaphragm.

– EN 14336 Heating systems in buildings.

Installation and commissioning of water based heating systems.

– BS 5440 – 1 Installation of flues and vent-

ilation for gas appliances of rated input not exceeding 70kW*

– BS 5440 – 2 Flueing and ventilation for gas

appliances of rated input not exceeding 70kW*

* 1st 2nd and 3rd family gases.

– BS 5449 Forced circulation hot water sys-

tems up to 45kW.

– BS EN 6798 Installation & maintenance of

gas fired hot water boilers of rated input not exceeding 70kW net.

– BS 5482 - Part 1 Domestic butane and

propane gas burning installations

Institute of Gas Engineers Publications:

– IGE/UP/1B (Edition 2) Tightness testing

and direct purging of small natural gas installations.

– IGE/UP/ 7 (Edition 2) Gas in timber and

light steel framed buildings.

Additionally for gas boilers systems with outputs greater than 70KW.

– BS 6644 Installation of gas boilers

between 60 kW and 2 MW (2nd and 3rd family gases)

– BS 5449 – IGE/UP/1 (Edition 2) Strength testing,

tightness testing and direct purging of industrial and commercial gas installations.

– IGE/UP/1A (Edition 2) Strength testing,

tightness testing and direct purging of small, low pressure industrial and commercial natural gas installations.

– IGE/UP/10 Installation of gas appliances

in industrial and commercial premises. Part 1 Flued appliances.

– The installation must comply with the cur-

rent version of the Clean Air Act.

1.5 Related documents

– I.S. 813 Domestic Gas Installations – I.S. 820 Non Domestic Gas Installations – Building Control Act 2007 – ETCI Regulations for installing electrical

systems

2 Notes on the documentation

8 Installation and maintenance instructions ecoTEC pro 0020244995_02

2 Notes on the documentation

2.1 Observing other applicable documents

▶ You must observe all the operating and installation in-

structions included with the system components.

2.2 Storing documents

▶ Pass these instructions and all other applicable docu-

ments on to the system operator.

2.3 Applicability of the instructions

These instructions apply only to:

Product article number

Article number

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

2.4 Benchmark

Vaillant is a licensed member of the Benchmark Scheme.

Benchmark places responsibilities on both manufacturers and installers. The purpose is to ensure that customers are provided with the correct equipment for their needs, that it is installed, commissioned and serviced in accordance with the manufacturer’s instructions by a competent person approved at the time by the Health and Safety Executive and that it meets the requirements of the appropriate Building Regulations. The Benchmark Checklist can be used to demonstrate compliance with Building Regulations and should be provided to the customer for future reference.

Installers are required to carry out installation, commissioning and servicing work in accordance with the Benchmark Code of Practice which is available from the Heating and Hotwater Industry Council who manage and promote the Scheme.

Benchmark is managed and promoted by the Heating and Hotwater Industry Council.

For more information visit www.centralheating.co.uk

3 Product description

3.1 Product design

3.1.1 Functional elements, product with integrated hot water generation

1 Gas valve

2 Water pressure sensor

3 Heat exchanger

4 Connection for the 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 Pressure gauge

13 Internal pump

14 Diverter valve

15 Expansion relief valve

16 Electronics box

17 Impeller sensor (hot

water)

18 Bypass valve

19 Secondary heat ex-

changer

3.2 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 generation

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

generation equipment

Set-up 4

0020244995_02 ecoTEC pro Installation and maintenance instructions 9

Information on the data plate

Meaning

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 compatible with the gas group at the installation site.

3.3 Serial number

The serial number can be found on a plastic label at the bottom of the front casing and on the identification plate.

3.4 CE label

The CE label shows that the products comply with the basic requirements of the applicable directives as stated on the identification plate.

The declaration of conformity can be viewed at the manufacturer's site.

3.5 Energy Saving Trust Endorsed Products

Only the most energy efficient products can carry the ‘Energy Saving Trust Endorsed Product’ brandmark making it easy for consumers to choose products that have met strict energy performance criteria.

Available for: Boilers, Heating controls and chemical inhibitors, the Energy Saving Trust endorsed product brandmark gives consumers confidence that a product will cost less to run, help lower energy bills and reduce carbon emissions.

About the Energy Saving Trust

Energy Saving Trust is an independent and impartial organisation that provides trusted energy saving advice to empower millions of people to lead affordable, low energy lifestyles. For more information visit energysavingtrust.org.uk

3.6 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

4 Set-up

4.1 Unpacking the product

1. Remove the product from its box.

2. Remove the protective film from all parts of the product.

4.2 Checking the scope of delivery

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

4.2.1 Scope of delivery

Number

Description

Heat generator

1 Installation kit containing the following:

- Product retainer

- Expansion relief valve connector

1 - Hot water connector

4 - Service valve

- Bag with small parts

Installation template

Condensate drain hose

1 Enclosed documentation

4 Set-up

10 Installation and maintenance instructions ecoTEC pro 0020244995_02

4.3 Transporting the product

4.3.1 General

▶ Hold the load as close as possible to your body. Do not

twist your body – instead, reposition your feet.

▶ If the unit is being lifted by two persons, ensure your

movements are coordinated during lifting.

▶ Avoid bending your upper body – do not lean forwards or

to the side.

▶ Wear appropriate cut-resistant and non-slip gloves to

protect yourself against sharp edges and maintain a safe and secure grip.

▶ If required, get somebody to assist you in this.

4.3.2 Unloading the box from the delivery van

▶ It is recommended that two people lift the unit together. ▶ Lift the box using the straps provided. ▶ Use safe lifting techniques – keep your back straight and

bend your legs at the knee.

▶ Hold the load as close as possible to your body. ▶ If the unit is being lifted by two persons, ensure your

movements are coordinated during lifting.

▶ If required, get somebody to assist you in this.

4.3.3 Transporting the box from the delivery

point to the installation site – ground floor

▶ It is recommended that two people lift the unit together. ▶ Use safe lifting techniques – keep your back straight and

bend your legs at the knee.

4.4 Dimensions

720

624

160

125

188

100 100

3535

440

338

180

125

11 10

1 Flue pipe wall duct

2 Product holder

3 Heating flow (22 × 1.5

diameter)

4 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 Flue pipe connection

10 Condensate discharge

connection, 19 mm diameter

11 Condensate trap

12 Drain line/heating ex-

pansion relief valve connection, 15 mm diameter

Set-up 4

0020244995_02 ecoTEC pro Installation and maintenance instructions 11

Consult the installation template that is supplied to find the dimension A.

4.5 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.

4.6 Using the installation template

▶ Use the installation template to ascertain the locations at

which you need to drill holes and make breakthroughs.

4.7 Wall-mounting the product

1. Check whether the wall has sufficient load-bearing capacity to bear the operational weight of the product.

2. Check if the supplied fixing material may be used for the wall.

Conditions: The load-bearing capacity of the wall is sufficient, The fixing material may be used for the wall

▶ Wall-mount the product as described. ▶ Install the product bracket (1) on the wall. ▶ Hang the product on the product bracket from above

using the suspension bracket.

Conditions: The load-bearing capacity of the wall is not sufficient

▶ Ensure that wall-mounting apparatus on-site has a suf-

ficient load-bearing capacity. Use individual stands or primary walling, for example.

▶ Do not wall-mount the product if you cannot provide

wall-mounting apparatus with a sufficient load-bearing capacity.

Conditions: The fixing material may not be used for the wall

▶ Wall-mount the product as described using the permitted

fixing material provided on-site.

4.8 Removing the front casing

▶ Remove the front casing as shown in the illustration.

5 Installation

12 Installation and maintenance instructions ecoTEC pro 0020244995_02

4.9 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 example, and potentially result in leaks.

▶ Always only remove one side section –

never both side sections at the same time.

▶ Remove the side section as shown in the illustration.

5 Installation

Danger! Risk of scalding and/or risk of material

damage due to incorrect installation leading to escaping water.

Stresses in supply lines can cause leaks.

▶ Install the supply lines without tension.

Caution. Risk of material damage due to the gas

leak-tightness test.

At a test pressure of >11 kPa (110 mbar), gas leak-tightness tests may cause damage to the gas valve.

▶ If, during gas leak-tightness tests, you

also place the gas lines and the gas valve in the product under pressure, use a max. test pressure of 11 kPa (110 mbar).

▶ If you cannot limit the test pressure to

11 kPa (110 mbar), close any gas isolator cocks that are installed upstream from the product before you carry out the gas leaktightness test.

▶ If, during gas leak-tightness tests, you

have closed the gas isolator cock that is installed upstream of the product, relieve the gas line pressure before you open this gas isolator cock.

Caution. Risk of material damage caused by corro-

sion

Due to non-diffusion-tight plastic pipes in the heating installation, air gets into the heating water. Air in the heating water causes corrosion in the heat generator circuit and in the product.

▶ If you use non-diffusion-tight plastic pipes

in the heating installation, ensure that no air gets into the heat generator circuit.

Caution. Risk of material damage due to heat trans-

fer during soldering.

▶ Only solder connectors if the connectors

are not yet screwed to the service valves.

Caution. Risk of material damage caused by

changes to the pipes that have already been connected.

▶ Only bend connection pipes if they have

not yet been connected to the product.

5.1 Installation requirements

5.1.1 Information on liquefied petroleum gas operation

In the as-delivered condition, the product is preset for operation with the gas group indicated on the data plate.

5.1.2 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.

Installation 5

0020244995_02 ecoTEC pro Installation and maintenance instructions 13

5.1.3 Using the correct type of gas

Using the incorrect type of gas 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.

5.1.4 Required preliminary work

1. Install a stop cock in the gas line.

2. Make sure that the existing gas meter is capable of passing the rate of gas supply required.

3. Install a system separator (to be provided on-site) directly on the cold water connection for the combination unit.

4. Check that the volumetric capacity of the expansion vessel is sufficient for the system volume.

Conditions: 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.

Conditions: External expansion vessel installed and warm start active

▶ Install a non-return valve in the product outlet (heating

flow) or decommission the internal expansion vessel in order to prevent the warm start function from being increasingly activated due to backflow.

5. Install a tundish with siphon for the condensate discharge and the exhaust pipe on the expansion relief valve. Lay as short a drain line as possible, at a downward gradient away from the tundish.

6. Insulate bare pipes exposed to environmental influences to protect them from frost using suitable insulating material.

5.2 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 accordance with the recognised rules of good engineering practice.

3. Remove the residues from the gas line by blowing through the gas line beforehand.

4. Purge the gas line before start-up.

5.3 Checking the gas line for leak-tightness

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

5.4 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.

5.5 Connecting the heating flow and heating

return

▶ Make the heating connections as shown in accordance

with the relevant standards.

5 Installation

14 Installation and maintenance instructions ecoTEC pro 0020244995_02

5.6 Connecting the condensate drain pipework

Danger! Risk of death from escaping flue gases!

The condensate drain pipework for the siphon must not be connected tightly to wastewater piping because, otherwise, the internal condensate trap may be drained fully and flue gas may escape.

▶ Do not connect the condensate drain

pipework tightly to the waste-water piping.

SoakawayGulleyInternal

stackpipe

Internal discharge system

min.

180

The product is equipped with a condensate trap (2). (The filling height is 145 mm). The condensate trap collects the condensate that has formed in a vessel with a capacity of approximately 200 ml, and intermittently releases the contents into the discharge pipe. This minimises the risk of the discharge pipe freezing.

▶ Connect the condensate discharge (1) to condensate

drain pipework (3) which has a minimum internal diameter of 19 mm (22 mm outside diameter for all external pipes) and is made from an acid-resistant material (e.g. plastic overflow pipe).

– 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.

▶ 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 drain pipework 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.

5.7 Installing the discharge pipe on the expansion relief valve

1. Install the discharge 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 discharge 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.

5.8 Flue installation

5.8.1 Installing and connecting the flue pipe

1. You can find out which flue pipes may be used by con-

sulting the enclosed flue pipe installation manual.

2. Observe the information on positioning the opening

for the flue pipe. This information can be found in the appendix.

Conditions: Installation in damp rooms

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

gas installation. 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 installation.

3. Install the flue pipe using the installation manual.

Installation 5

0020244995_02 ecoTEC pro Installation and maintenance instructions 15

5.8.2 Replacing the connection piece for the air/flue pipe as required

1. Replace the connection piece 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 15)

Alternatives 1 / 2

▶ If required, install the connection piece for the

air/flue pipe, 80/125 mm diameter. (→ Page 15)

Alternatives 2 / 2

▶ If required, install the connection piece with

offset for the air/flue pipe, 60/100 mm diameter. (→ Page 15)

5.8.2.1 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.).

5.8.2.2 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 15)

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.

5.8.2.3 Installing the connection piece with offset for the air/flue pipe, 60/100 mm diameter

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

is installed at the factory. (→ Page 15)

65 mm

2. Insert the alternative connection piece with offset towards the front.

3. Use two screws (1) to secure the connection piece to the product.

5.9 Electrical installation

The electrical installation must only be carried out by a qualified electrician.

Danger! Risk of death from electric shock!

Since mains connection terminals L and N remain live even if the on/off button is switched off:

▶ Switch off the power supply. ▶ Secure the power supply against being

switched on again.

5.9.1 Opening the electronics box

▶ Open the electronics box as shown in the illustration.

5.9.2 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 (+/-).

5 Installation

16 Installation and maintenance instructions ecoTEC pro 0020244995_02

▶ Only connect the mains connection cable

to the terminals marked for the purpose.

1. Route the connection cables of the components to be connected through the cable duct provided on the underside of the product on the left.

2. Use strain reliefs.

3. Shorten the connection cables as necessary.

30 mm max.

4. To prevent short circuits if a strand accidentally comes loose, only strip the outer sheathing of flexible lines to a maximum of 30 mm.

5. Ensure the inner conductor insulation is not damaged when stripping the outer sheathing.

6. Only strip inner conductors just enough to establish good, sound connections.

7. To avoid short circuits resulting from loose individual wires, fit conductor end sleeves on the stripped ends of the conductors.

8. Screw the respective plug to the connection cable.

9. Check whether all conductors are sitting mechanically securely in the terminals of the plug. Remedy this if necessary.

10. Plug the plug into the associated PCB slot; see the

connection diagram in the appendix.

5.9.3 Establishing the power supply

Caution. Risk of material damage due to high con-

nected voltage.

At mains voltages greater than 253 V, electronic components may be damaged.

▶ Make sure that the rated voltage of the

mains is 230 V.

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

2. Provide one common electricity supply for the boiler and for the corresponding controller:

– Power supply: Single-phase, 230 V, 50 Hz – Fuse protection: ≤ 3 A

3. Open the electronics box. (→ Page 15)

4. Connect the product using a fixed connection and an electrical partition with a contact opening of at least 3 mm (e.g. fuses or power switches).

5. Route a three-core mains connection cable that complies with the relevant standards through the cable duct and into the product.

– Mains connection line: Flexible line

6. Carry out the wiring. (→ Page 15)

7. Remove the supplied plug from the bracket in the electronics box and screw the plug onto the mains connection cable.

8. Close the electronics box.

9. Make sure that access to the mains connection is always available and is not covered or blocked.

5.9.4 Installing the product in a moist environment

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. If you use the factory-installed connection cable, if installed, with an earthed plug, there is a risk of death from electric shock.

▶ Never use the factory-installed connection

cable with earthed plug when installing the product in a moist environment.

▶ Connect the product using a fixed connec-

tion and an electrical partition with a contact opening of at least 3 mm (e.g. fuses or power switches).

▶ Use a flexible line for the mains connec-

tion line, which is routed through the cable duct into the product.

1. Open the electronics box. (→ Page 15)

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

(X1).

3. Unscrew the plug of the factory-installed power supply

cable, if installed.

4. Instead of the factory-installed power supply cable, if

installed, use a suitable three-core power supply cable which complies with the relevant standards.

5. Carry out the wiring. (→ Page 15)

6. Close the electronics box.

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

room-sealed air/flue gas installation. (→ Page 14)

5.9.5 Connecting controllers to the electronic system

1. Install the controller if necessary.

2. Open the electronics box. (→ Page 15)

3. Carry out the wiring. (→ Page 15)

4. Observe the connection diagram in the appendix.

Conditions: Connecting a weather compensator or a room temperature controller via eBUS

▶ Connect the controller to the eBUS connection. ▶ Bridge the 24 V = RT connection (X100 or X106), if there

is not already a bridge.

Conditions: Connecting a low-voltage controller (24 V)

▶ Remove the bridge and connect the controller to the

24 V = RT connection (X100 or X106).

Conditions: Connecting 230 volt controller

▶ Connect the switched live supply with the terminal

marked RT at X1 (beside the LNPE connections) then remove the link at X100 (do NOT connect 230 volt to any other terminal than the RT connection).

Operation 6

0020244995_02 ecoTEC pro Installation and maintenance instructions 17

Conditions: 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 controllers, change D.018 from Eco (intermittently operating pump) to Comfort (continuously operating pump). (→ Page 23)

5.9.6 Connecting additional components via

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

1. Install the components in accordance with the respective instructions.

Conditions: Components connected to relay 1

▶ Activate D.027. (→ Page 23)

Conditions: Components connected to relay 2

▶ Activate D.028. (→ Page 23)

5.9.7 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.

6 Operation

6.1 Operating concept

The operating concept and the display and setting facilities of the operator level are described in the operating instructions.

An overview of the display and setting options in the installer level can be found in the section "Overview of the installer level". (→ Page 17)

6.2 Installer level overview

S.31

Code

D.---

P.--

--/--

6.3 Calling up the installer level

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

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

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

Press to access the installer level.

◁ Code and -- appear in the display.

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

Press to access the check programmes (P) and the fault codes (F) and to return to the diagnostics codes (D).

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

Confirm by pressing ( ).

Press to cancel a setting or exit the installer level.

6.4 Live Monitor (status codes)

Menu → Live monitor

Status codes in the display provide information on the product's current operating mode.

Status codes – Overview (→ Page 35)

7 Start-up

18 Installation and maintenance instructions ecoTEC pro 0020244995_02

6.5 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.

Conditions: Water hardness: > 3.57 mol/m³

– Water temperature: ≤ 50 ℃

7 Start-up

7.1 Carrying out the initial start-up

Initial start-up must be carried out by a customer service technician or an authorised competent person using the commissioning checklist. The commissioning checklist in the appendix (→ Page 41) of the installation instructions must be filled in and stored carefully along with the unit's documentation.

▶ Carry out the start-up procedure using the commissioning

checklist in the appendix.

▶ Fill in and sign the commissioning checklist.

7.2 Switching the product on and off

▶ Press the on/off button on the product.

◁ The basic display appears on the display.

7.3 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 38)

7.4 Checking and treating the heating water/filling and supplementary water

Caution. Risk of material damage due to poor-qual-

ity heating water

▶ Ensure that the heating water is of suffi-

cient quality.

▶ 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-protection measures, 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

standards when treating the filling and supplementary water.

Provided the national regulations and technical standards do not stipulate more stringent requirements, the following applies:

You must treat the heating water in the following cases:

– If the entire filling and supplementary water quantity dur-

ing the operating life of the system exceeds three times the nominal volume of the heating installation, or

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

met, or

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

more than 10.0.

Total heating output

Water hardness at specific system volume

≤ 20 l/kW

> 20 l/kW ≤ 50 l/kW

> 50 l/kW

ppm

CaCO₃

mol/m³ppm

CaCO₃

mol/m³ppm

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 multiboiler 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 frost and cor-

rosion protection agents, biocides or sealants.

No incompatibility with our products has been detected to date with proper use of the following additives.

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

tions without exception.

We accept no liability for the compatibility of any additive or its effectiveness in the rest of the heating system.

Start-up 7

0020244995_02 ecoTEC pro Installation and maintenance instructions 19

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.

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

If the heating installation extends over several storeys, higher filling pressures may be required to avoid air entering the heating installation.

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.

7.6 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 system and open the purging valves on the radiators so that the contaminated water can completely drain.

4. Close the drain cocks.

5. Refill the heating system with water.

6. Check that the expansion relief valve of the heating system is functioning correctly by turning the handle on the valve.

7. Check the pressure in the heating system and top up with water if necessary.

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

7.7 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 18)

5. Connect the filling and drainage tap in the heating installation to a heating water supply, if possible with the cold water valve, in accordance with the relevant standards.

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 water 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.

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.

7 Start-up

20 Installation and maintenance instructions ecoTEC pro 0020244995_02

7.8 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 installation 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.

7.9 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.

7.10 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.

7.11 Gas inspection

7.11.1 Checking the factory-set gas ratio 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 identification plate with the gas group available at the installation site.

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

Only Vaillant Service Solutions may perform a gas conversion.

If a gas conversion to liquid gas has been carried 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 Solutions (0330 1003 143). ▶ Do not start up the product.

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

▶ Proceed as described below.

7.11.2 Checking the leak-tightness of the flue gas installation and flue gas recirculation

1. Check the flue gas installation is intact in accordance

with the latest gas safe technical bulletin and information supplied in the installation instructions.

2. For extended flue gas installations check for flue gas

recirculation using the air analysis point.

3. Use a flue gas analyser.

4. If you discover CO or CO2in the supply air, search for

the leak in the flue gas installation or for signs of flue gas recirculation.

5. Eliminate the damage properly.

6. Check again whether the supply air contains any CO or

CO2.

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

product.

7.11.3 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 thermostat.

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

operating temperature.

▶ Ensure that all other gas appliances in the property are

turned off.

▶ Measure the gas flow rate at the gas meter. ▶ Compare the measured values with the corresponding

values in the table.

Start-up 7

0020244995_02 ecoTEC pro Installation and maintenance instructions 21

H gas in m³/h P gas in kg/h

Qn, DHW

nom. Heatoutput 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

Conditions: Gas flow rate not in the permissible range

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

are correct.

▶ Only put the product into operation once the gas flow

rates have been corrected.

Conditions: Gas flow rate in the permissible range

▶ End the check programme P.01. ▶ 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.

7.11.4 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 isolator cock.

3. Use a screwdriver to undo the measuring nipple screw (1) (lower screw) at the gas valve.

4. Connect a pressure gauge (2) to the measuring nipple (1).

5. Open the gas isolator cock.

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

7. In addition, ensure that maximum heat can be dissipated into the heating system by turning up the room thermostat.

8. With the boiler operating at full load check that the gas inlet working pressure at the reference test point complies with the requirements.

– Permissible gas flow pressure for operation with

G20 natural gas: 1.3 … 2.3 kPa (13.0 … 23.0 mbar)

– Permissible gas flow pressure for operation with

G31 liquid gas: 2.3 … 4.3 kPa (23.0 … 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 undersized.

Conditions: 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 operating 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 isolator cock. ▶ Remove the pressure gauge and retighten the sealing

screw (1) for the measuring nipple.

▶ Open the gas isolator cock. ▶ Check the measuring nipple for gas tightness. ▶ Close the gas isolator cock. ▶ Install the front casing. ▶ Disconnect the product from the power mains. ▶ You must not start up the boiler.

Conditions: Gas flow pressure in the permissible range

▶ End the check programme P.01. ▶ Allow the boiler to cool down allowing pump overrun to

operate for a minimum of two minutes.

▶ Close the gas isolator cock. ▶ Remove the pressure gauge and retighten the sealing

screw (1) for the measuring nipple.

▶ Open the gas isolator cock. ▶ Check the measuring nipple for gas tightness. ▶ Install the front casing. ▶ Reset boiler controls for normal operation. ▶ Record the appliance gas inlet working pressure (kPa

resp. mbar) in the Benchmark gas boiler commissioning checklist.

7 Start-up

22 Installation and maintenance instructions ecoTEC pro 0020244995_02

7.11.5 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.

Settings Unit G20

natural

gas

G31 liquid

gas

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

Conditions: 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.

7.12 Checking leak-tightness

▶ Check the gas pipe, the heating circuit and the domestic

hot water circuit for leak-tightness.

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

Conditions: Room-sealed operation

▶ Check whether the vacuum chamber has been closed

tightly.

7.12.1 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.

7.12.2 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.

7.13 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 19) and Purging the heating installation (→ Page 20).

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

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

Adapting the unit to the heating installation 8

0020244995_02 ecoTEC pro Installation and maintenance instructions 23

Note

The actual reading on the digital pressure gauge should ideally be 0,05 MPa (0,5 bar) plus an additional pressure corresponding to the highest point of the system above the base of the boiler – 10 m head equals an additional 1 bar reading on the pressure gauge. The minimum pressure should not be less than 0,1 MPa (1 bar) in any installation. If the system is to be treated with an inhibitor it should be applied at this stage in accordance with the manufacturer’s instructions. Further information can be obtained from Sentinel, Betz Dearborn Ltd., Tel: 0151 420 9595, or Fernox, Alpha– Fry technologies. Tel: 0870

8700362.

8. Install the front casing.

8 Adapting the unit to the heating

installation

8.1 Calling up diagnostics codes

You can find the setting options in the diagnostics codes in the installer level.

Overview of diagnostics codes (→ Page 31)

▶ Call up the installer level. (→ Page 17)

8.2 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).

8.2.1 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

(target) [°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

8.2.2 Resetting the remaining burner anti-cycling time

▶

Press .

8.3 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 demand

Number of persons

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

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

8 Adapting the unit to the heating installation

24 Installation and maintenance instructions ecoTEC pro 0020244995_02

8.4 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.

Conditions: Low loss header installed

▶ Switch off the speed regulation and set the pump output

to a fixed value.

8.4.1 Remaining feed head of the pump

8.4.1.1 Pump characteristic line 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%

8.4.1.2 Pump characteristic line for VUW 306

400

300

200

100

0 200 400 600 800 1000 1200 1600

1800

1400

Remaining feed head

[hPa]

Flow rate [l/hr

]

100% PWM 85% 70% 60% 53%

8.5 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 increased (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 11)

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

Position of the adjusting screw

Pressure 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.

8.6 Handing the product over to the operator

▶ 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 operator's language.

▶ Explain to the operator how the safety devices work and

where they are located.

▶ Inform the operator how to handle the product. ▶ In particular, draw attention to the safety information

which the operator must follow.

▶ Inform the operator 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 operator for safe-keeping.

▶ Inform the operator about measures taken to ensure the

supply of combustion air and flue gas guiding, and instruct the operator that he must not make any changes.

▶ Inform the operator that they must not store or use ex-

plosive or highly flammable substances (such as petrol, paper 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.

Troubleshooting 9

0020244995_02 ecoTEC pro Installation and maintenance instructions 25

9 Troubleshooting

9.1 Checking service messages

appears if you have set a maintenance interval, for example, and this has passed or a service message is issued. The product is not in fault mode.

▶ Call up the Live Monitor. (→ Page 17)

Conditions: S.46 is displayed

The product is in Comfort protection mode. The product continues 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 25)

Note

If no fault message is present, the product will automatically switch back to normal operating mode after a certain time.

9.2 Eliminating faults

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

after checking the table in the appendix. Check programmes – Overview (→ Page 38) Overview of fault codes (→ Page 36)

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.

9.3 Calling up and clearing the fault memory

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

▶ Call up the installer level. (→ Page 17) ▶ 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

9.4 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

9.5 Preparing the repair work

1. Decommission the product.

2. Disconnect the product from the power mains.

3. Remove the front casing. (→ Page 11)

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.

9.5.1 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 reverse of these instructions.

▶ If you require spare parts for maintenance or repair

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

9.6 Replacing defective components

9.6.1 Replacing the burner

1. Remove the compact thermal module. (→ Page 28)

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 29)

9 Troubleshooting

26 Installation and maintenance instructions ecoTEC pro 0020244995_02

9.6.2 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 installation 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 corresponds 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 leaktightness test (function check). (→ Page 22)

17. If you have installed a new gas valve, adjust the gas ratio setting. (→ Page 20)

9.6.3 Replacing the heat exchanger

1. Drain the product. (→ Page 30)

2. Remove the compact thermal module. (→ Page 28)

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.

Inspection and maintenance 10

0020244995_02 ecoTEC pro Installation and maintenance instructions 27

Note

Instead of grease, use only water or commercially available soft soap to aid installation.

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 29)

16. Fill and purge the product and, if necessary, the heating installation. (→ Page 19)

9.6.4 Replacing the expansion vessel

1. Drain the product. (→ Page 30)

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 19)

9.6.5 Replacing the PCB or the display

Note

If you only replace one component, when the product is switched on, the new component adopts the parameters that were previously set from the component that was not replaced.

1. Open the electronics box. (→ Page 15)

2. Replace the PCB or display according to the assembly

and installation instructions supplied.

3. Close the electronics box.

9.6.6 Replacing the PCB and the display

1. Open the electronics box. (→ Page 15)

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 18)

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

device specific number.

5. Set the correct value for the relevant product type in accordance with the table below and confirm by pressing

Product type number

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

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

VUW 286/5-3 (P-GB) ecoTEC pro 28

◁ 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.

9.7 Completing repair work

1. Establish the power supply.

2. Switch the product back on if this has not yet been done. (→ Page 18)

3. Install the front casing.

4. Open all service valves and the gas isolator cock.

9.8 Checking the product for leak-tightness

▶ Check that the product is leak-tight. (→ Page 22)

10 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 indicated 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 instructions 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.

10 Inspection and maintenance

28 Installation and maintenance instructions ecoTEC pro 0020244995_02

10.1 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 insulating mat.

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

2. Close the gas isolator cock.

3. Remove the front casing.

4. Tilt 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 cap nut on the gas valve (3) or the cap nut (4) between the gas pipes.

7. Remove the ignition line plug (5) and the earth line plug (6) from the ignition electrode.

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

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

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 wall of the heat exchanger. If you notice any signs of damage, replace the relevant insulating mat.

10.2 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) using 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 exchanger.

Inspection and maintenance 10

0020244995_02 ecoTEC pro Installation and maintenance instructions 29

◁ The water flows out of the heat exchanger through

the condensate siphon.

10.3 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.

10.4 Cleaning the condensate trap

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

2. Flush out the lower section with water.

3. Fill the lower section with water up to about 10 mm below the upper edge.

4. Attach the lower section to the condensate trap.

10.5 Cleaning the filter in the cold water inlet

Applicability: 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.

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.

10.6 Installing the compact thermal module

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

2. Tighten the four new nuts (7) in a cross-wise pattern until the burner flange fits closely and uniformly onto the mating surfaces (if a torque spanner is available, set at 6 Nm).

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

4. Connect the gas line using a new seal. In the process, secure the gas pipe against twisting.

5. Open the gas isolator cock.

6. Make sure that there are no leaks.

7. Check that the sealing ring in the air intake pipe is positioned correctly in the seal seat.

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

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

10. Check the gas flow pressure.

11 Decommissioning

30 Installation and maintenance instructions ecoTEC pro 0020244995_02

10.7 Draining the product

1. Close the service valves of the product.

2. Start the check programme P.06 (diverter valve midposition).

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.

10.8 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 vessel at the vessel valve.

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

▶ Ideally, you should top up the expansion vessel with

nitrogen. 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 27)

4. Fill the heating installation. (→ Page 19)

5. Purge the heating installation. (→ Page 20)

10.9 Completing inspection and maintenance

work

Once you have completed all maintenance work:

▶ Check the gas flow pressure. (→ Page 21) ▶ Check the CO₂ content and, if necessary, adjust it (air

index setting). (→ Page 22)

▶ If required, reset the maintenance interval. (→ Page 23)

10.10 Checking the product for leak-tightness

▶ Check that the product is leak-tight. (→ Page 22)

11 Decommissioning

11.1 Temporarily decommissioning the product

▶ Press the on/off button.

◁ The display goes out.

▶ Close the gas isolator cock. ▶ On combination products and products with a connected

domestic hot water cylinder, you must also close the cold water stop valve.

11.2 Decommissioning the product

▶ Press the on/off button.

◁ The display goes out.

▶ Disconnect the product from the power mains. ▶ Close the gas isolator cock. ▶ Close the cold water stop valve. ▶ Drain the product. (→ Page 30)

12 Recycling and disposal

Disposing of the packaging

▶ Dispose of the packaging correctly. ▶ Observe all relevant regulations.

13 Customer service

To ensure regular servicing, it is strongly recommended that arrangements are made for a Maintenance Agreement. Please contact Vaillant Service Solutions for further details:

Telephone: 0330 100 3461

Appendix

0020244995_02 ecoTEC pro Installation and maintenance instructions 31

Appendix

A Overview of diagnostics codes

Note

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

Code Parameter Values or explanations

Default setting

Own setting

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

Auto: Product automatically adjusts max. partial load to current system demand

Auto

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

D.002 Max. anti-cycl. time: Heating 2 … 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 adjustable

D.006 Outlet temperature target value 35 … 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 generation and shift-load cylinder

35 … 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 adjustable

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

Room thermostat closed (heat requirement)

Not adjustable

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

D.017 Control type Control type:

0 = Flow, 1 = Return

Return: Automatic detection function for heating output inactive. Max. possible heating partial load when D.000 is on Auto.

0 = Flow

Appendix

32 Installation and maintenance instructions ecoTEC pro 0020244995_02

Code Parameter Values or explanations

Default setting

Own setting

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

Internal pump is switched on when the heating flow temperature is not at Heating off and the heat requirement is enabled via an external controller

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 flow/overrun stage 1

1: Heating mode and pump flow/overrun stage 1, hot water handling mode stage 2

2: Automatic heating mode, pump flow/overrun stage 1, hot water handling mode stage 2

3: Always stage 2

4: Automatic heating mode, pump flow/overrun stage 1, hot water handling 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 = Extractor hood

5 = External solenoid valve

6 = External fault message

7 = Solar pump (not active)

8 = eBUS remote control (not active)

9 = Legionella protection 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 = Extractor hood

5 = External solenoid valve

6 = External fault message

7 = Solar pump (not active)

8 = eBUS remote control (not active)

9 = Legionella protection pump (not active)

10 = Solar valve (not active)

2 = External pump

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 = Extractor hood

5 = External solenoid valve

6 = External fault message

7 = Solar pump (not active)

8 = eBUS remote control (not active)

9 = Legionella protection 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

Appendix

0020244995_02 ecoTEC pro Installation and maintenance instructions 33

Code Parameter Values or explanations

Default setting

Own setting

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 adjustable

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 adjustable

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 compensator)

Actual value in °C

Not adjustable

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

value set in factory

D.051 Offset max. speed In rpm, setting 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, thermostatic mixer 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

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

1 = Parallel operation (mid-position)

2 = Permanent heating mode position

0 = Normal operating mode

D.071 Max. heating target flow temp. 40 … 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

Appendix

34 Installation and maintenance instructions ecoTEC pro 0020244995_02

Code Parameter Values or explanations

Default setting

Own setting

D.076 Device Specific Number Device specific number = DSN

7 = 24 (VUW GB 246/5-3 A); VUW 246/5-3 (H-GB) ecoTEC pro 24

22 = 28 (VUW GB 286/5-3A); VUW 286/5-3 (H-GB) ecoTEC pro 28; VUW 286/5-3 (P-GB) ecoTEC pro 28

26 = 30 (VUW GB 306/5-3)

Not adjustable

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 set cylinder target 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 Start delay for hot water draw-off detection via impeller

(only products with integrated 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 controller

Recognised, not recognised

Not adjustable

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

ted

No reception

Reception

Synchronised

Valid

Not adjustable

D.092 actoSTOR communication status actoSTOR module detection

0 = Not connected

1 = Connection error: No communication via PeBus, actoSTOR module was previously detected

2 = Connection active

Not adjustable

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

Setting 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 adjustable

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

0 = No

1 = Yes

Appendix

0020244995_02 ecoTEC pro Installation and maintenance instructions 35

B Status codes – Overview

Note

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

Statuscode Meaning

S.00 Heating: No heat demand

Heating has no heat demand. The burner is off.

S.01 Heating mode: Fan start-upThe 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: BurneronThe 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 overrun

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-cycling 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 overrun

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 prerun

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 overrun

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: Controller

Room thermostat blocks heating mode.

S.31 No heat demand: Summer 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 protection

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 active

The comfort protection mode is activated.

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

Appendix

36 Installation and maintenance instructions ecoTEC pro 0020244995_02

Statuscode Meaning

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.

S.46 Comfort protection: Minimum 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 limitation

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 CO2content.

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.

C 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.

Message 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 defective or not connected

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

F.10 Short circuit: Flow sensor

Flow temperature sensor defective or has short-circuited

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

sensor.

F.11 Short circuit: Return sensor

Return temperature sensor defective or has short-circuited

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

F.20 Safety switch-off: Temperature limiter

Maximum temperature at the flow/return temperature sensor is too high when the safety cutout function is operating using the NTC

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

cable harness, sufficient purging.

F.22 Safety switch-off: Low water 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 temperature 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.

Appendix

0020244995_02 ecoTEC pro Installation and maintenance instructions 37

Message Possible cause Measure

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.

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 (blockage, adverse wind conditions, flue pipework too long), insufficient water in heating circuit, heating pump, activate check programme P.0.

F.26 Fault: Fuel valve not working

Gas valve assembly stepper motor defective or not connected

▶ 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. unsuccessful

Failure during start-up or ignition 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 electrode, electronics, earthing, CO₂ setting.

F.29 Operating failure: Ignit. unsuccessful

Gas supply interrupted intermittently. 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 switchoff 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 unstable

Flame monitor reports an unstable 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 Specific 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 ▶ Check: Water pressure (heating side, when heating pump

is not active), drain water if required, cable, water pressure sensor (short circuit to 24/5 V).

F.75 Fault: Pump/ water shortage

Insufficient pressure jump detected when starting the pump

1. Check: Water pressure sensor, heating pump (blockage), heating circuit (air, sufficient water volume), adjustable bypass, 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.

Appendix

38 Installation and maintenance instructions ecoTEC pro 0020244995_02

Message Possible cause Measure

F.77 Fault: Flue non-ret. valve/condens. pump

No flue non-return flap feedback; condensate pump overflow

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

feedback switch), condensate pump, bridge from the surfacemounted 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.

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. implausible

Temperature difference is implausible

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

nection, sensors are inverted).

F.85 Fault: NTCs fitted incorrectly

Flow/return temperature 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.

D Check programmes – Overview

Prüfprogramme 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 flap 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 heating position, actuation of internal pump for 9 cycles: 30 seconds on, 20 seconds 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 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).

Appendix

0020244995_02 ecoTEC pro Installation and maintenance instructions 39

E Wiring diagrams

E.1 Product connection diagram with integrated hot water generation

X18

X51

X20

24V

230V~

24V

230V~

X41

X22

13 11

2 6

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

Appendix

40 Installation and maintenance instructions ecoTEC pro 0020244995_02

F Inspection and maintenance work

The table below lists the manufacturer requirements with respect to minimum inspection and maintenance intervals. If national regulations and directives require shorter inspection and maintenance intervals, you should observe these instead of the intervals listed. Each time inspection and maintenance work is carried out, carry out the required preparatory and completion work.

# Maintenance work Interval

1 Check the tightness of the air/flue pipe, make sure that it is not damaged

and has been attached correctly, and check that it has been set up correctly

Annually

2 Removing dirt from the product and the vacuum chamber Annually

3 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

4 Checking the gas connection pressure at maximum heat input Annually

5 Checking the CO₂ content and, if necessary, adjusting it (air index setting) Annually

6 Recording the CO2content (the air ratio) Annually

7 Check that the connections/electrical plug connections have been con-

nected correctly/function correctly (product must be voltage-free)

Annually

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

9 Checking the condensate trap for dirt and cleaning it Annually

10 Checking the pre-charge pressure of the expansion vessel If required, at least every

2 years

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

aged insulating mats

If required, at least every 2 years

12 Cleaning the heat exchanger If required, at least every

2 years 28

13 Check the burner for damage If required, at least every

2 years

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

perature is insufficient, check the secondary heat exchanger

If required, at least every 2 years

15 Cleaning the filter in the cold water inlet If required, at least every

2 years 29

16 Check the impeller sensor for dirt/damage If required, at least every

2 years

17 Filling the heating installation If required, at least every

2 years 19

18 Run the test operation on the product/heating installation including

domestic hot water generation (if available) and, if required, purge the product/heating installation

Annually

19 Visually check the ignition and burner behaviour Annually

20 Re-checking the CO₂ content (the air ratio) If required, at least every

2 years

21 Check the product for gas, flue gas and water leaks Annually

22 Completing inspection and maintenance work Annually

Appendix

0020244995_02 ecoTEC pro Installation and maintenance instructions 41

G Commissioning Checklist

www.centralheating.co.uk

Benchmark Commissioning and Servicing Section

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

completed in full.

Appendix

42 Installation and maintenance instructions ecoTEC pro 0020244995_02

This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference.

GAS BOILER SYSTEM COMMISSIONING CHECKLIST

CONTROLS

Optimum start control

Fitted

ALL SYSTEMS

Yes

CENTRAL HEATING MODE

mbar OR mbar

COMBINATION BOILERS ONLY

Yes

DOMESTIC HOT WATER MODE

mbar OR mbar

Yes Temperature

CONDENSING BOILERS ONLY

Yes

ALL INSTALLATIONS

AND

Ratio

AND

Ratio

Yes

Appendix

0020244995_02 ecoTEC pro Installation and maintenance instructions 43

It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed.

Service Provider

SERVICE RECORD

SERVICE 01

AND

SERVICE 02

AND

SERVICE 03

AND

SERVICE 04

AND

SERVICE 05

AND

SERVICE 06

AND

SERVICE 07

AND

SERVICE 08

AND

SERVICE 09

AND

SERVICE 10

AND

Appendix

44 Installation and maintenance instructions ecoTEC pro 0020244995_02

PRIOR TO CO AND COMBUSTION RATIO CHECK

The boiler manufacturer’s installation instructions should have been followed, gas type verified and gas

supply pressure/rate checked as required prior to commissioning.

As part of the installation process, especially where a flue has been fitted by persons other than the

boiler installer, visually check the integrity of the whole flue system to confirm that all components are

correctly assembled, fixed and supported. Check that manufacturer’s max. flue lengths have not been

exceeded and all guidance has been followed (e.g. Gas Safe Technical Bulletin TB008).

The flue gas analyser should be of the correct type, as specified by BS 7967

Prior to its use, the flue gas analyser should have been maintained and calibrated as specified by the

manufacturer. The installer must have the relevant competence for use of the analyser.

Check and zero the analyser IN FRESH AIR as per analyser manufacturer’s instructions.

NOTE

THE AIR GAS RATIO VALVE IS FACTORY

SET AND MUST NOT BE ADJUSTED

DURING COMMISSIONING UNLESS THIS

ACTION IS RECOMMENDED FOLLOWING

CONTACT WITH THE MANUFACTURER.

If any such adjustment is recommended and

further checking of the boiler is required the installer/service engineer must be competent to carry out this work and to use the flue gas

analyser accordingly.

If the boiler requires conversion to operate with

a different gas family (e.g. conversion from

natural gas to LPG) separate guidance will be

provided by the boiler manufacturer

CARRY OUT FLUE INTEGRITY CHECK USING ANALYSER

Insert analyser probe into air inlet test point and allow readings to stabilise.

NOTE - where no air inlet test point is provided then a flue integrity check

with the analyser is not possible. The installer should verify that flue

integrity has been visually checked in accordance with the “Prior to

CO and combustion ratio check” box above before proceeding to the

“Check CO and combustion ratio at maximum rate” stage below.

SET BOILER TO MINIMUM RATE

In accordance with boiler instructions, set boiler to operate at minimum rate (to

minimum load condition). Allow sufficient time for combustion to stabilise.

NOTE - If manufacturer’s instructions do not specify how to set boiler to minimum

rate contact Technical Helpline for advice.

CHECK CO AND COMBUSTION RATIO AT MINIMUM RATE

With boiler still set at minimum rate, insert analyser probe into flue gas sampling

point. Allow readings to stabilise before recording.

NOTE - If no flue gas sampling point is present and the correct procedure is not

specified in the manual, consult boiler manufacturer for guidance.

CHECK CO AND COMBUSTION RATIO AT MAX. RATE

With boiler still set at maximum rate, insert analyser probe into flue gas

sampling point. Allow readings to stabilise before recording.

NOTE - If no flue gas sampling point is present and the correct procedure is

not specified in the manual, consult boiler manufacturer for guidance.

SET BOILER TO MAXIMUM RATE

In accordance with boiler instructions, set boiler to operate at max. rate

(full load condition). Allow sufficient time for combustion to stabilise.

NOTE - Do not insert analyser probe during this period to avoid

possible “flooding” of sensor.

CO less than

350ppm and

CO/CO

ratio

less than 0.004

 20.6%

and

< 0.2%

CO less than

350ppm and

CO/CO

ratio

less than 0.004

BOILER IS OPERATING SATISFACTORILY

no further actions required.

Ensure test points are capped, boiler case is correctly replaced and

all other commissioning procedures are completed.

Complete Benchmark Checklist, recording CO and combustion ratio

readings as required.

TURN OFF APPLIANCE AND CALL

MANUFACTURER’S TECHNICAL HELPLINE

FOR ADVICE.

THE APPLIANCE MUST NOT BE

COMMISSIONED UNTIL PROBLEMS ARE

IDENTIFIED AND RESOLVED.

VERIFY FLUE INTEGRITY

Analyser readings indicate that combustion products

and inlet air must be mixing. Further investigation of

the flue is therefore required.

Check that flue components are assembled, fixed

and supported as per boiler/flue manufacturer’s

instructions.

Check that flue and flue terminal are not obstructed.

less than

335ppm

and

CO/CO

ratio less

than 0.004

 20.6%

and

< 0.2%

Check all seals around the appliance burner,

internal flue seals, door and case seals.

Rectify where necessary.

TURN OFF APPLIANCE AND CALL

MANUFACTURER’S TECHNICAL HELPLINE

FOR ADVICE.

THE APPLIANCE MUST NOT BE

COMMISSIONED UNTIL PROBLEMS ARE

IDENTIFIED AND RESOLVED. IF

COMMISSIONING CANNOT BE FULLY

COMPLETED, THE APPLIANCE MUST BE

DISCONNECTED FROM THE GAS SUPPLY IN

ACCORDANCE WITH THE GSIUR.

NOTE: Check and record CO and combustion ratio

at both max. and min. rate before contacting the

manufacturer.

YES

Appendix

0020244995_02 ecoTEC pro Installation and maintenance instructions 45

H Opening of the flue pipe

D, E

H.1 Positioning of the opening of a fan-supported flue gas pipe

Installation site

Minimum dimensions

Directly below an opening, air bricks, opening windows, etc., that can be opened. 300 mm

B Above an opening, air bricks, opening windows, etc., that can be opened. 300 mm

C Horizontally to an opening, air bricks, opening windows, etc., that can be opened. 300 mm

Below temperature-sensitive building components, e.g. plastic gutters, down pipes or wastewater pipes

75 mm

E Below eaves 200 mm

F Below balconies or car port roofs 200 mm

G From vertical wastewater pipes or down pipes 150 mm

H From external or internal corners 200 mm

I Above floors, roofs or balconies 300 mm

J From a surface facing a terminal 600 mm

K From a terminal facing a terminal 1200 mm

L From an opening in the car port (e.g. door, window) which leads into the dwelling 1200 mm

M Vertical from a terminal on the same wall 1500 mm

N Horizontal from a terminal on the same wall 300 mm

O From the wall on which the terminal has been installed 0 mm

P From a vertical structure on the roof N/A

Q Above the roof area 300 mm

R Horizontal from adjacent windows on pitched or flat roofs 600 mm

S Above adjacent windows on pitched or flat roofs 600 mm

T Below adjacent windows on pitched or flat roofs 2000 mm

Appendix

46 Installation and maintenance instructions ecoTEC pro 0020244995_02

I Horizontal terminal positioning

BS 5440-1 recommends that fanned flue chimney terminals should be positioned as follows:

a) at least 2 m from an opening in the building directly opposite, and

b) so that the products of combustion are not directed to discharge directly across a boundary if the products are likely to cause a nuisance to a neighbour or discharge over a walkway or patio.

For IE see current issue of IS 813.

For boilers covered within this manual.

1) Dimensions D, E, F and G:

These clearances may be reduced to 25 mm without affecting the performance of the boiler. In order to ensure that the condensate plume does not affect adjacent surfaces the terminal should be extended as shown below.

Balcony/eaves

Gutter

Adequately secured air/flue gas pipe

The flue pipe must protrude beyond any overhang

2) Dimension H:

This clearance may be reduced to 25 mm without affecting the performance of the boiler. However, in order to ensure that the condensate plume does not affect adjacent surfaces a clearance of 300 mm is preferred.

For 1 and 2 above you can use a flue gas management kit to enable the termination point to be positioned and directed away from the building fabric.

J Opening of the flue pipe below eaves and balconies

Balcony/eaves

Gutter

Adequately secured air/flue gas pipe

The flue pipe must protrude beyond any overhang

Appendix

0020244995_02 ecoTEC pro Installation and maintenance instructions 47

K Technical data

Technical data – General

VUW 246/53 (H-GB) ecoTEC pro 24

VUW 286/53 (H-GB) ecoTEC pro 28

VUW 286/53 (P-GB) ecoTEC pro 28

Designated country (designation in accordance with ISO 3166)

GB (Great Britain), IE (Ireland)

Approved unit categories

2H3P

Gas connection, boiler side

15 mm 15 mm 15 mm

Flow/return heating connections, boiler side

22 mm 22 mm 22 mm

Hot and cold water connection, boiler side

G 3/4″ G 3/4″ G 3/4″

Expansion relief valve connector (min.)

15 mm 15 mm 15 mm

Air/flue gas connection

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

Condensate drain pipework (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 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 hot water generation, if applicable), G31

2.2 kg/h

Min. flue gas mass rate (G20)

2.47 g/s 2.47 g/s

Min. flue gas mass rate (G31)

3.49 g/s

Max. flue gas mass rate

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

Min. flue gas temperature

40 ℃ 40 ℃ 40 ℃

Max. flue gas temperature

70 ℃ 70 ℃ 70 ℃

Approved gas-fired units

C13, C33, C43, C53

30% efficiency

109.4 % 109.4 % 108 %

NOx class

6 6 6

SEDBUK (2005)

A A A

SEDBUK (2009) (G20/G31)

89.3 % 89.3 % 89.3 %

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

Appendix

48 Installation and maintenance instructions ecoTEC pro 0020244995_02

Technical data – G20 power/loading G20

VUW 246/53 (H-GB) ecoTEC pro 24

VUW 286/53 (H-GB) ecoTEC pro 28

Nominal heat output range P at 50/30 °C

5.9 … 24.8 kW

6.9 … 25.9 kW

Nominal heat output range P at 80/60 °C

5.2 … 23.0 kW

6.2 … 24.0 kW

Maximum heat output for hot water generation

23.4 kW 27.2 kW

Maximum heat input for hot water generation

23.7 kW 27.8 kW

Maximum heat input, heating side

23.5 kW 24.5 kW

Minimum heat input

5.5 kW 6.6 kW

Heating adjustment range

5 … 19 kW 5 … 19 kW

Nominal heat input efficiency (stationary) at 40/30 °C

107.0 % 107.0 %

Nominal heat input efficiency (stationary) at 50/30 °C

106.0 % 106.0 %

Nominal heat input efficiency (stationary) at 60/40 °C

101.0 % 101.0 %

Nominal heat input efficiency (stationary) at 80/60 °C

98.0 % 98.0 %

Technical data – Power/loading G31

VUW 286/53 (P-GB) ecoTEC pro 28

Nominal heat output range P at 50/30 °C

9.0 … 25.3 kW

Nominal heat output range P at 80/60 °C

8.2 … 24.0 kW

Maximum heat output for hot water generation

27.2 kW

Maximum heat input for hot water generation

27.8 kW

Maximum heat input, heating side

24.5 kW

Minimum heat input

8.7 kW

Nominal heat input efficiency (stationary) at 40/30 °C

105.0 %

Nominal heat input efficiency (stationary) at 50/30 °C

103.0 %

Nominal heat input efficiency (stationary) at 60/40 °C

101.0 %

Nominal heat input efficiency (stationary) at 80/60 °C

98.0 %

Appendix

0020244995_02 ecoTEC pro Installation and maintenance instructions 49

Technical data – Heating

VUW 246/53 (H-GB) ecoTEC pro 24

VUW 286/53 (H-GB) ecoTEC pro 28

VUW 286/53 (P-GB) ecoTEC pro 28

Maximum flow temperature

85 ℃ 85 ℃ 85 ℃

Max. flow temperature adjustment range (default setting: 75 °C)

30 … 80 ℃ 30 … 80 ℃ 30 … 80 ℃

Permissible total overpressure

0.3 MPa

(3.0 bar)

0.3 MPa

(3.0 bar)

0.3 MPa

(3.0 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 capacity

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 circulation 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 246/53 (H-GB) ecoTEC pro 24

VUW 286/53 (H-GB) ecoTEC pro 28

VUW 286/53 (P-GB) ecoTEC pro 28

Lowest water volume

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

Water volume (at ΔT = 30 K)

11.0 l/min 13.4 l/min 13.4 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 temperature range

35 … 65 ℃ 35 … 65 ℃ 35 … 65 ℃

Technical data – Electrics

VUW 246/53 (H-GB) ecoTEC pro 24

VUW 286/53 (H-GB) ecoTEC pro 28

VUW 286/53 (P-GB) ecoTEC pro 28

Electric connection

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

Permissible connected voltage

190 … 253 V 190 … 253 V 190 … 253 V

Built-in fuse (slow-blow)

2 A 2 A 2 A

Min. electrical power consumption

35 W 35 W 35 W

Max. electrical power consumption

50 W 80 W 80 W

Standby electrical power consumption

< 2 W < 2 W < 2 W

Level of protection

IP X4 D IP X4 D IP X4 D

Index

50 Installation and maintenance instructions ecoTEC pro 0020244995_02

Index

60/100 mm diameter unit connection piece with offset,

installing .............................................................................. 15

80/125 mm diameter unit connection piece, installing ........ 15

Air index setting................................................................... 22

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

Air/flue pipe, installed ............................................................ 5

Article number ....................................................................... 9

Automatic air vent................................................................ 19

Burner anti-cycling time....................................................... 23

Burner anti-cycling time, resetting ....................................... 23

Burner anti-cycling time, setting .......................................... 23

Burner, checking .................................................................29

Burner, replacing .................................................................25

Bypass valve, setting........................................................... 24

Calling up, diagnostics codes .............................................23

Calling up, fault memory...................................................... 25

Carrying out, inspection work .............................................. 27

Carrying out, maintenance work.......................................... 27

CE label................................................................................. 9

Check programmes .............................................................18

Checking, burner .................................................................29

Checking, CO₂ content ........................................................22

Checking, pre-charge pressure for the internal expansion

vessel .................................................................................. 30

Circulation pump .................................................................17

Cleaning, cold water inlet filter ............................................29

Cleaning, heat exchanger ..................................................28

Clearing, fault memory ........................................................ 25

CO₂ content, checking......................................................... 22

CO₂ content, setting ............................................................22

Cold water connection......................................................... 13

Cold water inlet filter, cleaning ............................................29

Combustion air supply........................................................... 5

Comfort protection mode..................................................... 25

Compact thermal module, installing .................................... 29

Compact thermal module, removing ...................................28

Competent person................................................................. 4

Completing, inspection work ...............................................30

Completing, maintenance work...........................................30

Completing, repair work ......................................................27

Condensate drain pipework.................................................14

Condensate siphon ...................................................5, 20, 29

Condensate trap............................................................ 20, 29

Connecting, controller ......................................................... 16

Connection dimensions.......................................................10

Controller, connecting ......................................................... 16

Corrosion............................................................................... 6

Decommissioning................................................................30

Decommissioning, temporarily ............................................ 30

Diagnostics codes, calling up .............................................. 23

Discharge pipe, expansion relief valve................................ 14

Display and setting options .................................................17

Disposal, packaging ............................................................ 30

Disposing of the packaging ................................................. 30

Documents ............................................................................ 8

Draining, product .................................................................30

Electricity ...............................................................................5

Electronics box, closing....................................................... 15

Electronics box, opening ..................................................... 15

Fan, replacing...................................................................... 26

Fault codes.......................................................................... 25

Fault memory, calling up ..................................................... 25

Fault memory, deleting........................................................ 25

Fault messages ...................................................................25

Filling ...................................................................................19

Flue gas route .......................................................................5

Flue pipe equipment connection piece................................ 15

From the delivery point to the installation site .....................10

Front casing, closed .............................................................. 5

Frost ......................................................................................6

Gas connection value.......................................................... 20

Gas conversion ...................................................................20

Gas ratio setting .................................................................. 20

Gas valve, replacing............................................................ 26

Handing over to the operator............................................... 24

Handling .............................................................................. 10

Heat exchanger, cleaning....................................................28

Heat exchanger, replacing ..................................................26

Heating flow......................................................................... 13

Heating installation, purging ................................................20

Heating return...................................................................... 13

Hot water connection........................................................... 13

Identification plate .................................................................8

If you smell flue gas............................................................... 5

If you smell gas .....................................................................4

Inspection work, carrying out............................................... 27

Inspection work, completing ................................................30

Installation site................................................................... 5–6

Installer level .......................................................................17

Installer level, calling up ...................................................... 17

Installing, compact thermal module..................................... 29

Intended use..........................................................................4

Internal expansion vessel, replacing ................................... 27

Isolator devices ...................................................................30

Leak-tightness .........................................................22, 27, 30

Liquefied petroleum gas ................................................ 12–13

Liquid gas ........................................................................5, 12

Mains connection ................................................................ 16

Maintenance interval, setting............................................... 23

Maintenance work, carrying out ..........................................27

Maintenance work, completing............................................ 30

Minimum clearance ............................................................. 11

Open-flued operation.............................................................5

Operating concept ...............................................................17

PCB and display, replacing ................................................. 27

PCB or display, replacing .................................................... 27

Power supply....................................................................... 16

Index

0020244995_02 ecoTEC pro Installation and maintenance instructions 51

Pre-charge pressure for the internal expansion vessel,

checking .............................................................................. 30

Preparing, repair work .........................................................25

Pressure gauge .....................................................................8

Product dimensions............................................................. 10

Product, draining ................................................................. 30

Product, switching off .................................................... 18, 30

Product, switching on .......................................................... 18

Pump output, setting ...........................................................24

Pump, remaining feed head ................................................ 24

Purging, heating installation ................................................ 20

Qualification...........................................................................4

Remaining feed head, pump ............................................... 24

Removing, compact thermal module................................... 28

Repair work, completing...................................................... 27

Repair work, preparing ........................................................25

Replacing the burner ...........................................................25

Replacing, fan .....................................................................26

Replacing, gas valve ........................................................... 26

Replacing, heat exchanger..................................................26

Replacing, internal expansion vessel..................................27

Replacing, PCB and display................................................ 27

Replacing, PCB or display................................................... 27

Safety device......................................................................... 5

Schematic drawing ................................................................5

Scope of delivery................................................................... 9

Serial number ........................................................................9

Service message................................................................. 25

Setting, bypass valve ..........................................................24

Setting, CO₂ content............................................................ 22

Setting, maintenance interval ..............................................23

Setting, pump output ........................................................... 24

Side section, installing......................................................... 12

Side section, removing ........................................................12

Spare parts.......................................................................... 25

Status codes........................................................................ 17

Switching off ........................................................................30

Switching off, product ..........................................................18

Switching on, product ..........................................................18

Tool ....................................................................................... 6

Treating the heating water................................................... 18

Type of gas.......................................................................... 13

Unit connection piece for the air/flue pipe, 60/100 mm

diameter with offset ............................................................ 15

Unit connection piece for the air/flue pipe, 80/125 mm

diameter .............................................................................. 15

Unit connection piece, changing .........................................15

Unit connection piece, removing ......................................... 15

Unloading the box ...............................................................10

Voltage .................................................................................. 5

Weight ................................................................................. 11

0020244995_02

28.03.2018

Supplier

Vaillant Ltd.

Nottingham Road Belper Derbyshire DE56 1JT Telephone 0330 100 3461

info@vaillant.co.uk www.vaillant.co.uk

We reserve the right to make technical changes.

0020244995_02

Vaillant VUW 286/5-3, VUW 246/5-3, VU 126/5-5, VU 246/5-5, VU 156/5-5 Installation And Maintenance Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual