Vaillant ecoMAX pro 18 E Instructions For Use Installation And Servicing

To be left with the user

Instructions for Use, Installation and Servicing ecoMAX pro

Wall hung condensing boilers for traditional open vented systems

GB

18 E

28 E

Table of Contents

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page

1 List of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Contents included with ecoMAX pro boiler . . . . . . . . . . . . . 3

2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety instructions and symbols . . . . . . . . . . . . . . . . . . . . . 3

2.1 General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.2 Gas Category. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.3 Gas Safety (Installation and Use) Regulations. . . . . . . . . . . 4

2.4 Gas Testing and Certification. . . . . . . . . . . . . . . . . . . . . . . . 4

2.5 CE Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.6 Control of Substances Hazardous to Health . . . . . . . . . . . . 4

2.6.1 Insulation Pads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.7 Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.8 Manual Handling Guidance . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.9 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.10 Protection Against Freezing. . . . . . . . . . . . . . . . . . . . . . . . . 5

2.11 Boilers Installed in a Compartment or Cupboard . . . . . . . . 5

2.12 Boiler Casing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.13 Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.14 Pluming from flue terminal . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.15 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.16 Maintenance and Servicing . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.17 Guarantee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Operating the Boiler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1 Sealed Central Heating Systems only . . . . . . . . . . . . . . . . . 7

3.2 All Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.3 User Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.4 To Turn the Boiler Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.1 Sheet Metal Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.2 Statutory Requirements and certification . . . . . . . . . . . . . . . 8

4.3 Gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.4 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Boiler Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Dimensions and Data labels . . . . . . . . . . . . . . . . . . . . . . . . 10

4.5 Electrical Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11


4.7 Heating System Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . 11

5 Boiler Location and Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.1 Boiler Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.2 Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.3 Timber Frame Buildings . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.4 Room Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.5 Compartment Ventilation. . . . . . . . . . . . . . . . . . . . . . . . . . . 12

6 Water system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6.1 Draining Tap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6.2 Safety Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6.3 Pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6.4 Bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6.5 Inhibitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6.6 Open (Vented) Water System. . . . . . . . . . . . . . . . . . . . . . . . 14

6.7 Domestic Hot Water Cylinder . . . . . . . . . . . . . . . . . . . . . . . 14

6.8 Domestic Hot Water System - unvented . . . . . . . . . . . . . . . 14

6.9 Sealed water Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6.9.1 Safety Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.9.2 Expansion Vessel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.9.3 Pressure Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page

6.9.4 Domestic Hot Water Cylinder . . . . . . . . . . . . . . . . . . . . . . . 15

6.9.5 Water Make up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.9.6 Filling a Sealed Water System. . . . . . . . . . . . . . . . . . . . . . . 15

7 Flue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7.1 Flue Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7.2 Flue termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7.3 Internal Flue Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

8 Installation Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

8.1 Unpacking of Boiler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

8.2 Rear flue exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

8.3 Other flue options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

9 Boiler fixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

9.1 Fitting the boiler hanging bracket . . . . . . . . . . . . . . . . . . . . 19

9.2 Boiler Fixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

10 Gas, Water and Condensate Connections . . . . . . . . . . . . . . . . . . 20

10.1 Gas Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

10.2 Water Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

10.3 Condensate Drain Connection. . . . . . . . . . . . . . . . . . . . . . . 20

11 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

11.1 Appliance, pump and external controls . . . . . . . . . . . . . . . . 21

11.2 Electrical connections – testing. . . . . . . . . . . . . . . . . . . . . . 21

12 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

12.1 Preliminaries - All Systems. . . . . . . . . . . . . . . . . . . . . . . . . 22

12.2 Sealed Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

12.3 Gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

12.4 Initial Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

12.5 Testing - Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

12.6 Testing - Heating System. . . . . . . . . . . . . . . . . . . . . . . . . . . 23

12.7 User Controls and Options . . . . . . . . . . . . . . . . . . . . . . . . . 24

12.8 Temperature Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

12.9 Pump Exercise Programme . . . . . . . . . . . . . . . . . . . . . . . . . 24

12.10 Hand over to user . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

13 Natural Gas to LPG conversion (ecoMAX pro 28E only) . . . . . . . 25

14 Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

14.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

14.2 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

14.3 Functional Check of Boiler Operation . . . . . . . . . . . . . . . . . 28

14.4 Spark Electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

14.5 Burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

14.6 Combustion Chamber and Heat Exchanger. . . . . . . . . . . . . 30


14.8 Inner Casing Panel Seal Check . . . . . . . . . . . . . . . . . . . . . . 31

15 Combustion analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

16 Fault Finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

16.1 Status Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

16.2 Fault Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

16.3 Fault Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

16.4 Fault Finding Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . 36

17 Short Spare Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

18 Benchmark gas boiler commissioning checklist . . . . . . . . . . . . . 38

2


List of Contents 2 Introduction

1.1 Contents included with ecoMAX pro boiler

Ensure that all contents are included before commencing installation.

Vaillant Ltd. support the Benchmark initiative.

At the rear of this literature you will find a

Benchmark gas boiler commissioning checklist. It is very important that this is completed correctly at the time of installation, commissioning and hand over to the user.

Items supplied with unit

(ecoMAX pro)

Fig 1.1

Item Quantity

1

2

3

4

5

6

7

8

9

2

1

1

1

1

1

1

1

1

Description

Boiler

Hanging bracket

Flue connection adaptor

Instruction booklet

Guarantee card and envelope and log book

Template

Screws/wallplugs

Gas service valve and compression couplers

Natural Gas to LPG conversion data badge over sticker

Safety instructions and symbols

Please observe the safety instructions in this manual for the installation of the appliance!

Symbols used in the manual are explained below:

DANGER!

Immediate danger to life and limb!

CAUTION!

Potentially dangerous situation for the product and environment!

NOTE:

Useful information and instructions.

• Symbol for necessary task.

- List for functional descriptions and general list.


3

2 Introduction

2.1 General Information

Thank you for choosing a Vaillant boiler. The information given in this booklet will enable you to obtain the best performance from your boiler.

The Benchmark logbook should be completed by the installer and/or commissioning engineer and handed to the user.

NOTE:

This boiler must be installed and serviced by a competent person in accordance with the

Gas Safety (Installation and Use) Regulations

1998. In the UK 'CORGI' registered installers undertake the work to a safe and satisfactory standard.

This boiler is designed to provide central heating from a fully pumped open-vented or sealed water system with a fully indirect cylinder.

The central heating water temperature can be adjusted on the boiler.

Once the controls are set the boiler operates automatically.

A frost protection programme is also included.

Please read these instructions and follow them carefully for the correct and economical use of your boiler.

2.2 Gas Category

The boiler is supplied factory set for use on Natural Gas

(G20). The ecoMAX pro 28E, only, can be field adjusted for use on LPG (propane G31), see page 22-23 for instructions or contact Vaillant Service, 0870 6060 777.

2.3 Gas Safety (Installation and Use) Regulations

In your own interests and that of safety, it is the Law that ALL gas appliances are installed by a competent person in accordance with the current issue of the above regulations.

2.4 Gas Testing and Certification

The boiler is tested and certificated for safety and performance. It is, therefore, important that no alteration is made to the boiler.

2.5 CE Mark

This boiler meets the requirements of Statutory

Instrument, No. 3083 The Boiler (Efficiency) Regulations, and therefore is deemed to meet the requirements of

Directive 92/42/EEC on the efficiency requirements for new hot water boilers fired with liquid or gaseous fuels.

Type test for purposes of Regulation 5 certified by:

Notified body 0087.

Product/production certified by: Notified body 0086.

The CE mark on this appliance shows compliance with:

1. Directive 90/396/EEC on the approximation of the laws of the Member States relating to appliances burning gaseous fuels.

2. Directive 73/23/EEC on the harmonisation of the Laws of the Member States relating to electrical equipment designed for use within certain voltage limits.

3. Directive 89/336/EEC on the approximation of the

Laws of the Member States relating to electromagnetic compatibility.

2.6 Control of Substances Hazardous to Health

Under Section 6 of The Health and Safety at Work Act

1974, we are required to provide information on substances hazardous to health.

The adhesives and sealants used in this appliance are cured and give no known hazard in this state.

2.6.1 Insulation Pads

These can cause irritation to skin, eyes and the respiratory tract.

If you have a history of skin complaint you may be susceptible to irritation. High dust levels are usual only if the material is broken.

Normal handling should not cause discomfort, but follow normal good hygiene and wash your hands before eating, drinking or going to the lavatory.

If you do suffer irritation to the eyes or severe irritation to the skin seek medical attention.

2.7 Spare Parts

Only original Vaillant spare parts may be used.

2.8 Manual Handling Guidance

During the appliance installation and the replacement of the heat exchanger it will be necessary to employ caution and assistance whilst lifting as the appliance or component exceeds the recommended weight for a one man lift.

In certain situations it may be required to use a mechanical handling aid.

Take care to avoid trip hazards, slippery or wet surfaces.

2.9 Warnings

Gas Leak or Fault

If a gas leak or fault exists or is suspected, turn off the gas emergency control valve immediately. Eliminate all sources of ignition, i.e. smoking, blowlamps, hot air guns etc. Do not operate electrical lights or switches either on or off. Open all doors and windows, ventilate the area.

Clearances

If fixtures are positioned close to the boiler, space must be left as shown in fig 5.1. Enough space must also be left in front of the boiler to allow for servicing.

4


Important information 2

Sheet Metal Parts

This boiler contains metal parts (components) and care should be taken when handling and cleaning, with particular regard to edges.

Sealed Components

Under no circumstances must the User interfere with any sealed component as this could result in a potentially dangerous situation arising.

Electrical Supply Failure

This boiler must be earthed.

The boiler will not work without an electrical supply.

Normal operation of the boiler should resume when the electrical supply is restored.

Reset any external controls to resume normal operation of the central heating.

If the boiler does not resume normal operation turn the mains reset switch off and on. If the boiler does not resume normal operation after this the overheat thermostat may have operated. The overheat thermostat would only operate under abnormal conditions and, under these circumstances; it would be advisable to consult your installation / servicing company.

2.10 Protection Against Freezing

The boiler has a built in frost protection programme as long as the electricity and gas are left switched on.

This device operates the burner and system pump when the temperature inside the boiler falls to 3°C.

Any other exposed areas of the system should be protected by a separate frost thermostat.

If the mains electricity and gas are to be turned off for any long periods during severe weather, it is recommended that the whole system, including the boiler, should be drained to avoid the risk of freezing.

Make sure that, if fitted, the immersion heater in the cylinder is switched off.

If you have a sealed water system contact your installation/ servicing company as draining, refilling and pressurising MUST be carried out by a competent person.

As a safety feature the boiler will stop working if the condensate drain becomes blocked. During freezing conditions this may be due to the forming of ice in the condense drain external to the house. Release an ice blockage by the use of warm cloths on the pipe. The boiler should then restart. Contact your installation/ servicing company if the fault persists.

2.11 Boilers Installed in a Compartment or Cupboard

If the boiler is fitted into a compartment or cupboard it does not require ventilation openings.

Do not use the compartment or cupboard for storage.

2.12 Boiler Casing

Do not remove or adjust the casing in any way, as incorrect-fitting may result in incorrect operation or failure to operate at all.

2.13 Condensate Drain

The condensate drain, see section 10.3, must not be modified or blocked.

2.14 Pluming from flue terminal

All condensing boilers produce a plume of water vapour from the flue terminal. This is due to the high efficiency and hence low flue gas temperature. This may increase in wet, damp weather but this is completely normal and indicates that the boiler is operating correctly.

2.15 Cleaning

This appliance contains metal parts and care should be taken when handling and cleaning with particular regard to edges.

The boiler casing can be cleaned using a mild liquid detergent with a damp cloth, then a dry cloth to polish.

Do not use any form of abrasive or solvent cleaner as you may damage the paint work.

2.16 Maintenance and Servicing

For the continued efficient and safe operation of the boiler it is recommended that it is checked and serviced at regular intervals. The frequency of servicing will depend upon the installation conditions and usage, but in general, once a year should be enough.

If this appliance is installed in a rented property there is a duty of care imposed on the owner of the property by the current issue of the Gas Safety (Installation and Use)

Regulations, Section 35.

Servicing/maintenance should be carried out by a competent person in accordance with the rules in force in the countries of destination.

To obtain service, please call your installer or Vaillant

Service Solutions (0870 6060 777).

Please be advised that the installation engineer on completion of commissioning and servicing should complete the ‘Benchmark’ logbook.

All CORGI Registered Installers carry a CORGI ID card, and have a registration number. Both should be recorded in your boiler Logbook. You can check your installer is

CORGI registered by calling CORGI direct on: - 01256

372300.


5

2 Introduction

2.17 Guarantee

Vaillant provide a full parts and labour warranty for your appliance.

The appliance must be installed by a suitably competent person in accordance with the gas safety (installation and Use) Regulations 1998, and the manufacture's instructions. In the UK ‘CORGI’ registered installers undertake the work in compliance with safe and satisfactory standards.

Terms and conditions apply to the warranty, details of which can be found on the warranty registration card included with this appliance.

Failure to install and commis ion this appliance in compliance with the manufacture's instructions may invalidate the warranty (this does not affect your statutory rights).

6


3 Operating the boiler

3.1 Sealed Central Heating Systems only

CAUTION: A sealed water system must be filled and pressurised by a competent person.

Only light the boiler when you are sure that the system and boiler have been filled and pressurised.

The pressure should read at least 0.7 bar, when the system is cold. If the needle displays a value below this, follow the instructions left by your installer to refill the system. Alternatively your installer should be called to refill the system.

3.2 All Systems

Check that the electrical supply to the boiler is ON at the external isolator.

Set any remote heating system controls as required.

3.3 User Controls

Slide the On / Off control down to the I position to turn on the boiler. The operating indicator will illuminate (green) to show that the boiler is on.

The temperature of the central heating water can be adjusted by pushing the mode button ( ) until the radiator symbol is displayed. Pushing the + or - buttons will then set the water temperature as desired. (Typical setting temperatures for a normal radiator heating system will be in the range of 60 °C to 80 °C. Note that set temperatures below 60 °C will not sufficiently heat any hot water cylinder). To return to the normal mode push the mode button ( ) until the display shows the current temperature of water in the boiler.

When the boiler is operating the flame symbol will be shown in the display. The bar symbol is also shown and this indicates the modulating output of the boiler. The boiler will automatically modulate to the output needed by the heating system - the more bars that are displayed, the higher the output.

The ecoMAX pro is a fan flue appliance and the operation of the fan may be heard when the boiler is running and for a short period after the boiler has stopped. Should a fault condition occur the operating indicator will flash red and will be accompanied by an "F" symbol in the display. To reset the boiler slide the On / Off control to the Off (O) position and after 5 seconds back to the On (I) position. The boiler should now operate. If the fault persists contact your installer / service provider. The ecoMAX pro has a Holiday / frost mode. If you are going on holiday and do not want the boiler to be operated by the external heating controls press the mode button ( ) until the MODE indicator flashes in the left hand edge of the display. Then press the + or - button until the arrow indicator points to the holiday symbol ( ). The boiler will now only operate if necessary for frost protection of the boiler itself as well as running a daily pump exercise programme to prevent sticking. It will not be turned on and off by the external heating controls. If a system frost protection thermostat has been fitted this will remain active.

3.4 To Turn the Boiler Off

Normally the boiler will be turned off by the heating system controls. The mains On / Off control may be used to switch off the boiler, however it is preferable to leave the electrical supply on whenever possible to permit operation of the built-in frost protection and daily pump exercise programme.

Fig 3.1


7

4 General information

IMPORTANT NOTICE:

The boiler is supplied in one pack and the flue is supplied separately.

The boiler is factory set for use on Natural Gas (G20).

The ecoMAX pro 28E, only, can be field adjusted for use on LPG (propane G31).

Where no British Standards exists, materials and equipment should be fit for their purpose and of suitable quality and workmanship.

Refer to Manual Handling Operations, 1992 regulations.

The installation of this boiler must be carried out by a competent person in accordance the rules in force in the countries of destination.

Manufacturer’s instructions must not be taken as overriding statutory requirements.

4.1 Sheet Metal Parts

CAUTION!

When installing the appliance, care should be taken to avoid any possibility of personal injury when handling sheet metal parts.

4.2 Statutory Requirements

The appliance is suitable only for installation in GB and

IE and should be installed in accordance with the rules in force. In GB the installation of the boiler must be carried out by a competent person as described in the following regulations:

The manufacturer’s instructions supplied.

The Gas Safety (Installation and Use) Regulations.

The appropriate Buildings Regulations either The

Building Regulations, The Building Regulations

(Scotland),The Building Regulations (Northern Ireland).

The Water Fittings Regulations or Water bye laws in

Scotland. The Health and Safety at Work Act, Control of

Substances Hazardous to Health (COSHH).

The Current I.E.E. Wiring Regulations.

Where no specific instructions are given, reference should be made to the relevant British Standard Code of

Practice. In IE, the installation must be carried out by a competent person and installed in accordance with the current edition of I.S.813 “Domestic Gas Installations”, the current Building Regulations and reference should be made to the current ETCI rules for Electrical Installation.

In GB the following Codes of Practice apply:

BS4814, BS6798, BS5440 Part 1 and 2, BS5546 Part 1,

BS5449, BS6891, BS6700, BS7074 Part 1 and 2,

BS7593, BS7671.

In IE: I.S.813, BS5546, BS 5449, BS 7074, BS 7593.

Manufacturer’s instructions must not be taken as overriding statutory requirements.

Note: For further information, see the current issue of the

Building Regulations, approved document L1 ( in the UK) and the current issue of the following:

1) Central heating system specification (CheSS)

2) Controls for domestic central heating system and hot water. BRECSU.

Certification

This boiler certificated to the current issue of EN 483 for performance and safety.

It is important that no alteration is made to the boiler, without permission, in writing, from Vaillant.

Any alteration that is not approved by Vaillant, could invalidate the warranty and could also infringe the current issue of the Statutory Requirements.

4.3 Gas Supply

The gas installation must be in accordance with the current issue of BS6891. In IE this is the current edition of IS813.

The supply from the governed meter must be of adequate size to provide a steady inlet working pressure of 20mbar (8in wg) G20 and at the boiler.

On completion, test the gas installation for soundness using the pressure drop method and suitable leak detection fluid, purge in accordance with the above standard.

4.4 Technical Data

All dimensions are given in millimetres (except as noted).

See Fig. 4.1.

The data label is positioned on the combustion chamber cover see fig. 4.2.

The data label includes the product Gas Council number;

18E - 41 044 30

28E - 41 044 31

The Seasonal Efficiency Domestic Boilers UK (SEDBUK) is:

All ecoMAX pro: Class ‘A’.

The value is used in the UK Government’s Standard

Assessment Procedure (SAP) for energy rating of dwellings. The test data from which it has been calculated has been certified by B.S.I.

8



Boiler specification

Maximum CH heat input (net)

CH heat output (80/60 °C)

CH heat output (50/30 °C)

SEDBUK Band

SAP Seasonal Efficiency

NOx Class

Electrical rating

Inlet gas working pressure required (natural gas)

Gas supply (G20) Gross CV (s.t.)

Maximum gas rate

Minimum gas rate

Burner % CO

2

(Case on)

Gas connection

Water connections

Condensate drain (internal diameter min.)

Internal fuse ratings

Maximum CH system pressure

Weight

Electrical supply

External fuse

Power input

Case height

Case width

Case depth ecoMAX pro

18 E

18.9

5.0 - 18.3

5.3 - 20.0

A

90.4

5

IP40

20

37.8

2.00

0.53

9.0 +/-0.2

15 mm Compression

22 mm Compression

19

Fan supply PCB 3.15 AT

Main PCB 125 mAT

3

31

230/~50

3

60

600

375

334 ecoMAX pro

28 E

28.6

5.3 - 28.2

5.7 - 30.6

A

90.6

5

IP40

Units kW kW kW

%

20

37.8

3.02

0.56

9.0 +/-0.2 mbar

MJ/m 3

M

M

%

3

3

/h

/h

15 mm Compression

22 mm Compression

19 mm

Fan supply PCB 3.15 AT A

Main PCB 125 mAT

3

A bar

33

230/~50

3

60

600

375

334

A

W kg

V~/Hz mm mm mm


9


Fig 4.1

Fig 4.2

10



4.5 Electrical Supply

The boiler must be earthed.

All system components shall be of an approved type and all wiring to current I.E.E. wiring regulations.

External wiring must be correctly earthed, polarised and in accordance with the relevant standards.

In GB this is BS 7671.

In IE this is the current edition of I.S.813 “Domestic Gas

Installations”.

The boiler must be connected to a permanent 230V ac,

50Hz supply.

Connection of the whole electrical system of the boiler, including any heating controls, to the electrical supply must be through one common isolator and must be fused

3 Amp maximum.

Isolation should be by a double pole switched fused spur box, with a minimum gap of 3mm for both poles.

The fused spur box should be readily accessible and preferably adjacent to the appliance. It should be identified as to its use.

Alternatively connection can be made through an unswitched shuttered socket and 3A fused 3-pin plug both to the current issue of BS 1363 may be used, provided they are not used in a room containing a bath or shower.

The colours of three core flexible cable are, blue - neutral, brown - live, green and yellow - earth.


A plastic drain pipe must be fitted to allow discharge of condensate to a drain.

Condensate should, if possible, be discharged into the internal household draining system. If this is not practical, discharge can be made externally into the household drainage system or a purpose designed soak away, see Section 10.3 for more details.

4.7 Heating System Controls

It is recommended that a programmer and room thermostat control the boiler.

Thermostatic radiator valves may be installed, however they must not be fitted in a room where the room thermostat is located.

NOTE:

All systems must have at least one radiator not fitted with a thermostatic valve.

NOTE:

For further information, see the current issue of the Building Regulations, approved document

L1, and the following current issues of:

1) Central heating system specification (CheSS) and

2) Controls for domestic central heating system and hot water. BRECSU.


11

5 Boiler location and ventilation

5.1 Boiler Location

NOTE:

This boiler is not suitable for outdoor installation.

This boiler may be installed in any room, although particular attention is drawn to the installation of a boiler in a room containing a bath or shower where reference must be made to the relevant requirements.

This boiler is suitable for installation in bathroom zones 2 and 3.

In GB this is the current I.E.E. WIRING REGULATIONS and BUILDING REGULATIONS. In IE reference should be made to the current edition of I.S.813 “Domestic Gas

Installations” and the current ETCI rules. The boiler must be mounted on a flat wall, which is sufficiently robust to take its total weight, see boiler specification page 9.

5.2 Clearances

The boiler should be positioned so that at least the minimum operational and servicing clearances are provided, see fig 5.1.

Additional clearances may be beneficial around the boiler for installation and servicing.

For flue installations where external access is not practicable, consideration should be given for the space required to insert the flue internally, which may necessitate clearance larger than those specified in fig

5.1.

5.3 Timber Frame Buildings

If the boiler is to be installed in a timber frame building it should be fitted in accordance with the Institute of Gas

Engineers document IGE/UP/7/1998. If in doubt seek advice from the local gas undertaking or Vaillant.

5.4 Room Ventilation

The boiler is room sealed, so when it is installed in a room or space, a permanent air vent is not required.

5.5 Compartment Ventilation

Due to the high efficiency and hence low casing temperature of this boiler, cupboard or compartment ventilation is not necessary. Leave existing air vents.

Fig 5.1

12


6 Water system

6.1 Draining Tap

A draining tap must be provided at all the lowest points of the system, which will allow the entire system and hot water system to be drained.

Draining taps shall be to the current issue of BS 2879.

6.2 Safety Valve

A safety valve need not be fitted to an open-vented system. See also section 6.9.1.

6.3 Pump

The pump should be fitted on the flow pipe from the boiler and have isolating valves each side.

A variable duty pump should be set to give a temperature difference of no greater than 20°C between the flow and return, with the thermostat set at

“MAX”, which is about 80°C, to give a flow rate as shown in table 2.

See chart for pressure loss of the boiler, fig 6.1 or 6.2.

High resistance micro bore systems may require a higher duty pump.

6.4 Bypass

A system bypass will be required fitted at least 1.5 metres away from the boiler, refer to the current issue of central heating system specifications (CHeSS).

Model

TABLE 2

Minimum flow rate ecoMAX pro 18 E ecoMAX pro 28 E

773.8 litres/hr

1289 litres/hr

This is equal to 20°C differential at maximum heat input.

Fig 6.1


Fig 6.2

13

6 Water system

6.5 Inhibitor

In the case of an existing installation, it is ESSENTIAL that prior to installing the new boiler the system is thoroughly flushed. For optimum performance after installation of a new system, the boiler and its associated central heating system should also be flushed. Flushing should be carried out in accordance with BS7593: 1992 using a cleanser such as Sentinel X300 or X400, or

Fernox Superfloc.

For long-term corrosion protection, after flushing, an inhibitor suitable for stainless steel heat exchangers should be used, refer to the current issue of BS 5449 and BS 7593 on the use of inhibitors in central heating systems. Examples are Sentinel X100 and Fernox.

IMPORTANT: It is ESSENTIAL that the cleanser is fully removed from the system after flushing and before adding inhibitor. Take care to ensure that all low points in the system are fully drained.

For all systems follow the manufacture’s instructions, but where new radiators are fitted do not leave the cleanser in the system for longer than 24 hours.

For optimum performance the boiler and its associated central heating system should be flushed in accordance with BS7593: 1992 using a cleanser.

For advice on the application of system cleansers and inhibitors contact either;

Fernox, Alpha-Fry Technologies

Tandem House

Marlow Way

Beddington Farm Road

Croydon CR0 4XS

Tel: 0870 601 5000

Fernox technical help line

01799 550811 or:

Sentinel, GE Betz

Widnes

Cheshire, WA8 8UD

Tel: 0151 420 9595.

6.6 Open (Vented) Water System

The boiler must be supplied from an unrestricted water supply taken from a feed and expansion cistern situated at a maximum height of 27 metres (90ft) above the boiler.

The cold feed must be 15mm minimum size.

The vent must rise continuously and be unrestricted.

It is important that the relative positions of the pump, cold feed and open vent are as shown in fig 6.3.

6.7 Domestic Hot Water Cylinder

CAUTION!

Single feed indirect cylinders are not suitable.

The domestic hot water cylinder must be of the double feed fully indirect coil type.

6.8 Domestic Hot Water System - unvented

General - All domestic hot water circuits, connections, fittings must be in accordance with the relevant standards and water supply regulations.

For GB: Guidance G17 to G24 and recommendation R17 to R24 of the Water Regulations Guide.

For IE: The current edition of I.S.813 “Domestic Gas

Installations”. Where a storage system will not have a vent to atmosphere the installation must comply with the building regulations and local Water Company bylaws, see also the current issue of BS5546 and BS6700.

If fitting to an existing system the local authority should be informed.

NOTE: ecoMAX pro boilers are not suitable for use with Vaillant VANTAGE unvented cylinders and

MUST not be used in connection with these cylinders.

6.9 Sealed water Systems

The installation must comply with the appropriate requirements of the current issue of BS4814, BS5449,

BS6759, BS6798 and BS7074 Part 1 and 2. For IE your attention is drawn to the current edition of IS 813.

See fig 6.4 for a suggested layout.

Fig 6.3

14


6 Water system

6.9.1 Safety Valve

A safety valve must be fitted to a sealed system.

It shall be preset, non-adjustable with a lift pressure of

3-bar, incorporating seating of a resilient material, a test device and a connection for drain.

The safety valve discharge pipe must be routed to outside the building, must not discharge above an entrance or window or any type of public access area, be clear of any electrical fittings and positioned so that any discharge can be seen.

6.9.2 Expansion Vessel

A diaphragm type expansion vessel, conforming to the current issue of BS4814 (see also BS7074 Part 1 and 2).

For IE the current edition of IS 813, must be connected at a point close to the inlet side of the circulating pump, see the diagrammatic layout, Fig. 6.4. unless laid down differently by the manufacturer.

The expansion vessel volume depends on the total water system volume and the initial system design pressure.

For any system an accurate calculation of vessel size is given in the current issue of BS5449 and BS7074 Part 1.

Example: For an initial design pressure of 0.7 bar, the minimum total vessel volume required is 0.063 x Total

System Volume.

NOTE:

A higher initial design pressure requires a larger volume expansion vessel.

The charge pressure must not be less than the static head of the system, that is, the height of the highest point of the system above the expansion vessel.

6.9.3 Pressure Gauge

A pressure gauge with a set pointer and covering at least

0 to 4 bar (0 to 60 lb/in2) shall be fitted permanently to the system in a position where it can be seen when filling the system.

6.9.4 Domestic Hot Water Cylinder

SINGLE FEED INDIRECT CYLINDERS ARE NOT

SUITABLE. The domestic hot water cylinder must be of the double feed fully indirect coil type. It must be suitable for working at a gauge pressure of 0.35 bar above the safety valve setting.

6.9.5 Water Make up

Provision should be made for replacing water loss from the system using a make up bottle mounted in a position higher than the top point of the system, connected through a non-return valve to the return side of either the heating circuit or the hot water cylinder.

Alternatively, provision for make up water should be made using a proprietary filling loop.

6.9.6 Filling a Sealed Water System

Provision for filling the system at low level must be made.

This can be achieved by the use of a proprietary filling loop.

Fig 6.4


15

7 Flue

DANGER!

Vaillant appliances are certified only for use with genuine Vaillant flue pipes. Only use genuine Vaillant flue pipes. Malfunctions can occur if you use other accessories. These may result in damage and injury. You will find a list of genuine flue pipes in the Vaillant installation manual for flue pipes.

The CE mark is valid only if the appliance is operated with Vaillant flue pipes.

7.1 Flue Options

There are various flue systems to choose from, as follows:

• Standard horizontal air/flue duct with elbow and terminal. Is suitable for installations up to 800 mm measured from the centre of the boiler flue outlet to the outside face of the wall.

Flue extensions are available to extend this length up to

10M. Both 90° bends and 45° elbows are also available to increase siting flexibility.

• Vertical air/flue duct and terminal

• Air/flue duct extension (470 mm)



• Telescopic air/flue duct extension

(440 mm - 690 mm)

• 87° elbow

• Two 45° bends

Additional accessories are available

• Variable termination kit

Refer to flue system installation instructions.

Telescopic Air/Flue Duct, for full details.

When extension pipes are used the flue system must be designed to have a continuous fall to the boiler of at least

3° to allow condensate to run out via the drain.

7.2 Flue termination

The following details refer to both flue systems.

a. The terminal must be positioned such that the products of combustion can disperse freely at all times.

b. In certain weather conditions a plume of water vapour may be visible from the flue terminal. Positions where this could be a nuisance should be avoided.

c. If the terminal is fitted less than 2 m above a balcony, above ground or above a flat roof to which people have access then a suitable terminal guard must be provided and fitted (A suitable guard is manufactured by:

Tower Flue Components, Morley Road, Tonbridge, Kent,

TN9 1RA. Size: 280mm x 280mm x 270mm) reference code K6.

NOTE:

Vertical flues must not terminate within 600-mm of an openable window, air vent or any other ventilation opening.

The flue assembly shall be so placed or shielded as to prevent ignition or damage to any part of the building.

7.3 Internal Flue Installation

The flue can be installed from inside the building when access to the outside wall face is not practicable.

16


7 Flue

TERMINAL POSITION

A1) Directly below an opening, above an opening or horizontal to an opening i.e. air brick, opening window or other, etc

B Below gutters, soil pipes or drain pipes

C Below eaves

D Below balconies

mm

300

752)

2002)

2002)

E From vertical drain pipes and soil pipes

F From internal or external corners

G Above ground, roof or balcony

H From a surface facing a terminal

I From a terminal facing a terminal

K Vertically from a terminal on the same wall

L Horizontally from a terminal on the same wall 300

M Distance from adjacent wall for vertical Flue 500

25

3003)

300

6004)

1200

1500

1) In addition, the terminal should not be nearer than 150mm to an opening in the building fabric formed for the purpose of accommodating a built-in element such as a window.

2) Dimension B,C and D; 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 in Fig 7.4.

3) Dimension F; 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.

4) BS 5440-1 It is recommended that a fanned flue terminal should be positioned as follows: a) at least 2m from an opening in a building directly opposite, and b) so that the products of combustion are not directly directed to discharge across a boundary.

For IE, recommendations are given in the current edition of IS 813.

H,

I

F J

A

G

E A

G

A

A

BCD

F F

K

L

L

K

Fig 7.1


Fig 7.2

17

8 Installation preparation

8.1 Unpacking of Boiler

Stand the boiler carton upright.

Cut and remove the securing straps and lift off the carton sleeve. Place aside the flue adaptor and connections pack until required.

NOTE:

Care should be taken not to scratch the white surface of the boiler casing.

Carefully lay the boiler on its back, remove the two front casing panel securing screws and lift off the panel from two retaining lugs, see fig 8.1.

Remove the two inner casing panel securing screws at the bottom front of the panel, then lift off the two retaining lugs, see fig 8.2.

8.2 Rear flue exit

Refer to flue system installation instructions for full details.

8.3 Other flue options

Flue instructions for other flue systems such as vertical

RSF flues, flues run to the side of the boiler and the use of additional bends etc. are detailed in the flue installation instructions.

Fig 8.1

18

Fig 8.2


9 Boiler fixing

9.1 Fitting the boiler hanging bracket

If previously removed, reposition the wall template over the flue hole and mark the position of the fixing holes for the hanging bracket, see fig 9.1.

Mark and drill the fixing holes and secure the hanging bracket. Fix the hanging bracket to the wall using the screws supplied. Ensure the uppermost set of screw positions are used (it may be necessary to use additional or alternative fixings to ensure adequate support).

NOTE:

If the boiler is to be fitted in a timber framed building ensure that the bracket is secured to a substantial part of the timber frame capable of taking the weight of the boiler.

9.2 Boiler Fixing

Lift the boiler into position in the following manner:

Lean the top of the boiler slightly to the wall and position just above the hanging bracket. Allow the boiler to slowly move downwards until engaged in the hanging bracket.


Fig 9.1

19

10 Gas, Water and Condensate connections

10.1 Gas Connection

Before connection check the supply of local gas.

The gas supply can be connected from below, or through the wall at the rear of the boiler. See fig 10.1. and refer to section 4.3.

The whole of the gas installation, including the meter, should be inspected, tested for soundness and purged in accordance with the current issue of BS6891 and in IE the current edition of I.S.813 “Domestic Gas

Installations”.

10.2 Water Connections

Provision is made for the water connections to be made from above the boiler, see fig 10.2 (using the two 22mm compression couplers supplied). The position is shown on the wall template.

Flush out the domestic hot water and the heating systems before connecting to the boiler.

10.3 Condensate Drain Connection, refer to fig.10.1.

The condensate drian connection is at the underside rear of the boiler.

The condense drain is suitable for use with standard "Push fit" overflow pipe and couplings DO NOT use adhesive when connecting to the spigot (1) The condense drain pipe (2) should be non corrosive plastic.

The drain pipe should have a continuous fall of a least

(45mm per metre) away from the boiler. Condensate should, if possible be discharged into the household internal drainage system.

(a) Preferably the drain pipe should run and terminate internally to the house soil and vent stack at least 450mm above the invert of the stack. A trap giving a water seal of at least 75mm should be incorporated into the pipe run, and there must be an air break in the discharge pipe upstream of the trap. This should be designed so that the condensate cannot be discharged into the house if the condensate drain pipe becomes blocked.

(b) Connecting into the internal discharge branch

(e.g. sink waste or washing machine) with an external termination, the condensate drain pipe should have a minimum diameter of 22mm with no length restriction and should incorporate a trap with a 75mm (3) seal.

The connection should preferably made down stream of the sink waste trap, if the connection is only possible up stream, then an air break is needed between the two taps. This is normally provided by the sink waste.

(c) Termination in a gully (5) below grid level (6) and above the water level. The external pipe length should be kept as short as possible to minimise the risk of freezing and should not be more than 3 metres.

(d) At a condensate absorption point (soakaway) (7) . The external pipe length should not be more than 3 metres.

Refer to the latest issue of BS 6798 Specification

22mm compression is the recommended fixing for servicing.

(not supplied)

COUPLING

Fig 10.1

Fig 10.2

for installation of gas fired boilers of rate input not exceeding 70kW net for further information.

Before operating the boiler the condensate trap must be filled with water.

20


11 Electrical connections

DANGER!

This appliance must be earthed.

All system components must be of an approved type, and meet the requirements of the current IEE Wiring

Regulations, and in IE the current edition of the ETCI rules. Electrical components have been tested to meet the equivalent requirement of the BEAB.

Connection of the whole electrical supply must be through a common isolator.

Isolation should preferably be by a double pole switched fused spur box having a minimum contact separation of 3mm on each pole. The fused spur box should be readily accessible and preferably adjacent to the boiler.

It should be identified as to its use. A fused three pin plug and shuttered socket outlet may be used instead of a fused spur box provided that: a) They are not used in a room containing a fixed bath or shower.

b) Both the plug and socket comply with the current issue of BS1363.

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

CAUTION!

This appliance must be wired in accordance with these instructions. Any fault arising from incorrect wiring cannot be put right under the terms of the Vaillant guarantee.

11.1 Appliance, pump and external controls.

ecoMAX pro boilers are fitted with a terminal box located at the base of the boiler into which all connections are made. To gain access to the terminal box, remove the two retaining screws indicated in fig 11.1 and carefully lower to reveal the terminal strip inside.

Disconnect and remove the test cable from the terminal strip and discard.

Connect both the mains supply and switched live from the external controls (room thermostat and, if applicable, frost thermostat) into the marked terminals as shown in figs 11.2 and 16.3.

Connect the pump supply into the marked pump terminals as shown in figs 11.2 and 16.3.

NOTE:

The boiler incorporates a pump overrun

thermostat. Only feed the pump from the marked terminals in the terminal box on the boiler, not from a separate supply.

Observe all terminal markings and colour codes shown in fig 11.2.

Ensure that all flexible cords are routed through the strain relief cable glands on the inlet of the terminal box.

Refit the terminal box to the underside of the boiler using the two retaining screws.


11.2 Electrical connections – testing

Carry out preliminary electrical system checks as below:

1. Test insulation resistance to earth of mains cable.

2. Test the earth continuity and short circuit of cables.

3. Test the polarity of the mains.

When completed ensure the supply to the boiler is isolated.

RETAINING

SCREWS (2)

CONNECTION

BOX

Fig 11.1

Fig 11.2

21

12 Commissioning

Please ensure the “Benchmark” logbook is completed and left with the user.

NOTE:

During commissioning the overheat thermostat may trip before air is completely removed from the system. If this occurs the boiler can be reset by pushing the manual reset button on the overheat thermostat (see fig 12.1).

12.1 Preliminaries - All Systems

A competent person should carry out commissioning, in accordance with the current issue of BS 6798.

Make sure that the system has been thoroughly flushed out with cold water.

Refill the system with water, making sure that all the air is properly vented from the system and pump, fig 12.1 shows vent point.

Before operating the boiler check that all external controls are calling for heat.

12.2 Sealed Systems

Fill the system until the pressure gauge registers the recommended pressure. Clear any air locks and check for leaks.

Check the operation of the safety valve, preferably by allowing the water pressure to rise until the valve lifts.

This should be within ± 0.14 bar, of the preset pressure.

Where this is not possible a manual check should be carried out.

Release the cold water to the initial design pressure.

12.3 Gas supply

Isolate the boiler from the mains electrical supply.

The complete gas installation including the gas meter must be isolated, tested for soundness and purged in accordance with BS 6891, in IE the current edition of

IS 813.

The gas supply to the boiler can be purged by slackening the gas service union connection beneath the boiler. Ensure that there is adequate ventilation, extinguish all naked flames and do not smoke whilst purging.

After purging, the gas service union connection must be re tightened and tested for soundness. (The boiler itself does not require purging as this will be done by the automatic burner sequence control).

The gas valve is factory set for natural gas (G20) and should need no adjustment. (LPG G31 ecoMax pro 28E only) should be adjusted as described Section 14 Natural gas to LPG conversion. It should be checked that the supply pressure is 20mb when the boiler is firing at full rate. This can be achieved by checking the inlet pressure at the pressure test point on the gas valve shown in fig

12.2.

CAUTION!

Before operating the boiler check the data badge and ensure that the correct gas type appliance has been installed.

FLOW

THERMISTOR

RETURN

THERMISTOR

Fig 12.1

OFFSET

ADJUSTMENT

GAS CONTROL

VALVE

OVERHEAT

THERMOSTAT

FLOW

PIPE

VENT POINT

THROTTLE

ELECTRICAL

PLUG

PRESSURE TEST

POINT

Fig 12.2

22


12 Commissioning

12.4 Initial Lighting

The lighting procedure of the boiler is fully automated.

To prepare the boiler for initial lighting first ensure that all external controls are not calling for heat.

With the front casing panel and inner casing panel removed turn on the mains electrical supply. Slide the On

/ Off control down to the I position to turn on the boiler.

The operating indicator will illuminate (green) to show that the boiler is on.

Now adjust the boiler thermostat to its lowest setting by pushing the mode button ( ) (see fig 3.1.) until the radiator symbol is displayed. Push the - button until the lowest temperature possible is selected. Now return to the normal mode by pushing the mode button, the display will now show the current temperature of water in the boiler.

Now turn on external heat demand to boiler.

The fan should start and after a few seconds the ignition will commence.

12.5 Testing - Gas

The boiler is supplied ready adjusted and no further gas adjustments are necessary, however both the gas inlet working pressure and the maximum gas rate should be checked at least 10 minutes after the burner has lit.

The gas inlet working pressure can be checked at the pressure test point on the gas valve (fig 12.2.). The gas inlet working pressure should be 20 mbar when the boiler is firing at full rate. After testing the inlet pressure remove the U gauge, tighten the sealing screw and test for tightness.

The approximate gas rates are:

18 E : 2.00 m 3 /h 28 E : 3.02 m 3 /h

NOTE: The burner pressure cannot be measured at the gas valve due to the fan/burner design. Replace the inner and front casing panels. Record appliance working gas inlet pressure (mbar) in Benchmark Installation,

Commissioning and Service log book.

NOTE:

Allow the boiler to run on minimum until commissioning is complete.

If the burner fails to light the fan will stop. Initially this may be due to air in the gas supply line.

The boiler will have three attempts at ignition.

To reset the boiler slide the On / Off control to the Off (O) position and after 5 seconds back to the On (I) position.

The boiler should now restart.

Once the boiler has lit, allow the system to warm at the minimum temperature setting to purge any air from the system.

Once the system has been purged of air, the temperature of the central heating water can be adjusted to the desired setting by pushing the mode button ( ) (see fig 3.1.) until the radiator symbol is displayed. Pushing the + or - buttons will then set the water temperature as desired. (Typical setting temperatures for a normal radiator heating system will be in the range of 60°C to

80°C. Note that set temperatures below 60°C will not sufficiently heat any hot water cylinder). To return to the normal mode push the mode button ( ) until the display shows the current temperature of water in the boiler.

The boiler will then continue to fire until the user controls are satisfied.

NOTE:

After the first power up the firing sequence changes. After one minute stabilisation time the boiler will ramp slowly to full rate rather than going immediately to full rate, this feature is designed to cope with small system requirements.

Functional checks

Procedure:

After installing and checking the gas supply pressure, perform a function check before commissioning the appliance and handing over to the user.

• Commission the appliance according to the relevant operating manual.

• Check the gas supply pipe, exhaust system, heating system and the hot water lines for leaks.

• Check that the flue system has been installed properly according to the flue system assembly manual.

• Check for ignition and an even flame on the burner.

• Perform a function check on the heating system (see

Section 12.6).

• Hand over the appliance to the user (see Section

12.10).

12.6 Testing - Heating System

Check that all remote controls are calling for heat. The boiler will fire automatically. Fully open all radiator valves, flow control valve ‘A’ and bypass valve ‘B’, see fig

6.4.

Balance the radiators as required and if fitted adjust valve ‘A’ to give the required system differential. Turn off all radiators that can be shut off by the user and check to see if less than the maximum differential allowed of

20°C can be achieved across flow and return. Allow the system to reach maximum temperature then switch off the boiler by isolating from the electrical supply.

Drain the entire system rapidly whilst hot, using the drain tap at the lowest part of the system. Fill and vent the system as described previously.

Lock or remove the handles from controls valve ‘A’ to prevent unauthorised adjustment.


23

12 Commissioning

DANGER!

Note that if the boiler is run with an empty condensate trap there is a danger that fumes might escape into the room and cause poisoning. For this reason, it is important to ensure that the trap is topped up each time the unit is cleaned.

12.7 User Controls and Options

The mains/reset switch is used to restart the boiler after a fault condition has occurred, i.e. ignition failure.

The user display (see section 3.3) allows the user to set the desired central heating temperature.

12.8 Temperature Display

The boiler shows the operating temperature of the unit.

12.9 Pump Exercise Programme

After a power cut or every 24 hour in frost setting

/summer mode the pump will run for one minute to prevent it from sticking. This will also occur during normal operating if there is no demand for more than 24 hours.

12.10 Hand over to user

Instruct and demonstrate the lighting procedure and advise the user on the safe and efficient operation of the boiler. Instruct on and demonstrate the operation of any heating system controls.

Advise that to ensure the continued efficient and safe operation of the boiler it is recommended that it is checked and serviced at regular intervals. The frequency of servicing will depend upon the installation conditions and usage, but in general, once a year should be adequate.

Draw attention, if applicable, to the current issue of the

Gas Safety (Installation and Use) Regulations, Section

35, which imposes a duty of care on all persons who let out any property containing a gas appliance.

It is the Law that any servicing is carried out by a competent person.

Advise the user that, like all condensing boilers this appliance will produce a plume of condensation from the flue terminal in cool weather. This is due to the high efficiency and hence low flue gas temperature of the boiler.

Advise the user of the precautions necessary to prevent damage to the system, boiler and the building, in the event of the heating system being out of use during frost or freezing conditions.

Advise the user that the permanent mains electrical supply SHOULD NOT be switched off, as the built in frost protection and pump saver program would not be operable.

Reminder , leave these instructions including the

‘Benchmark’ logbook with the user.

24


13 Conversion

Natural Gas to LPG conversion (ecoMAX pro 28E only)

The ecoMAX pro 28E is able to be field adjusted for use on LPG – propane G31 gas. To enable conversion the use of a combustion analyser is necessary.

- Press the ‘-‘ key and scroll through until ‘96’ (installer mode) is shown on the screen, then press the

‘mode’button again.

IMPORTANT:

After converting from Natural Gas to LPG, re commission and check boiler function as described in commissioning section of the servicing and installation instructions.

IMPORTANT:

This conversion must only be carried out by a competent person in accordance with the Gas Safety (Installation and Use) Regulation 1998. In the UK CORGI registered installers undertake the work to a safe and satisfactory standard.

Before starting any work:

Isolate the mains electricity supply to the boiler by disconnecting the plug at the socket outlet (if there is only an isolating switch remove the fuse from the switch).

Turn off the gas supply at the gas service valve fitted to the boiler.

Remove the front panel, the inner front panel and the lower front panel to access the gas valve.

Turn the gas valve throttle screw (fig 13.4) fully clockwise.

Turn the throttle back anti-clockwise 5

Ensure that the gas analyser is set to the correct fuel setting - Propane.

1 /

2

turns.

To obtain conversion follow the procedure as below:

- Connect a CO

2

combustion analyser to the test point on the flue adaptor.

- Turn on the gas service cock.

- Turn on the electrical supply, and slide the on/off control down to the ‘I’ position to turn on the boiler. Set the timer to continuous and turn up any room thermostats to call for demand.

- With the boiler interface in normal operating mode, press and hold the ‘mode’ button ( ) for 10 seconds until a flashing ‘0’ appears.

Fig 13.2

- Press the ‘+‘ key and scroll through until ‘8’ is shown on the left of the screen, then press the ‘mode’ button again.

Fig 13.3

- Set the appliance fan speed/burner to maximum by pressing the ‘+’ key until ‘2’ (burner to Pmax) is shown on the right hand side of the screen. Press the ‘mode’ button again to confirm.

- Check the CO2 value, which should be 10.5 % ± 0.2

%. Allow the boiler time to reach the maximum rate

(approximately 5-10 minutes).

- Adjust the maximum rate CO2 with the (‘A’) throttle using a screwdriver to 10.5 % (rotate anti-clockwise to increase).


Fig 13.1

25

13 Conversion

"A" throttle –

"Pmax" rotate to increase

"B" offset adjustment

"Pmin" rotate to increase

Appliance

ecoMAX pro 28E

CO2 content at nominal load for LPG in vol. %

10.5 % ± 0.2 %

Fig 13.4

- Again in screen ‘8’, Set the appliance fan speed/burner to minimum by pressing the ‘-‘ key until ‘1’ (burner to

Pmin) is shown on the right hand side of the screen.

Press the ‘mode’ button again.

Fig 13.5

- Check the CO2 value, which should be 10.5 % ± 0.2 %.

If adjustment proves necessary then proceed as follows.

- Adjustment of the CO2 at minimum rate is very coarse, so carefully adjust the CO2 with the (‘B’) offset adjustment using a 2 mm allen key to 10.5 %, (rotate clockwise to increase).

- After checking the combustion, press and hold the

‘mode’ button for 10 seconds to return to the normal mode, showing the current flow temperature. Replace the cap on the sampling point and refit the outer front case.

- Fit the LPG conversion label to the data badge.

- Re-commission boiler as described in the Installation and Servicing Instructions supplied with boiler.

26


14 Servicing

14.1 General

DANGER!

It is law that all servicing work is carried out by a competent person (CORGI registered).

Inspections/Maintenance work not carried out by a competent person can result in damage to property and personal injury.

DANGER!

Electrocution by touching live parts can be fatal!

The supply terminals in the appliance switch box are live even if the main ON/OFF switch is turned off.

Protect the switch box from spray water.

Before working on the appliance, turn off the power supply and secure against restart!

All routine servicing requirements can be achieved by the removal of the front panel, inner panel and chassis front only.

Remove the two screws on the underside of the front panel and lift off. Undo the two screws on the front of inner panel and lift off, see fig 14.1.

To remove chassis front drop down the control panel into the service position.

Remove the four screws from the chassis front, see fig

14.2.

Remove the chassis front by pulling it out at the top from its retaining slots.

NOTE:

When replacing chassis front panel ensure the bottom fits behind lip.

Unless stated otherwise any part removed during servicing should be replaced in the reverse order to removal.

IMPORTANT:

Before starting any maintenance work:

- Isolate the mains electricity supply by disconnecting the plug at the socket outlet (if there is only an isolating switch, remove the fuse from the switch).

- Turn off the gas supply at the gas service valve fitted to the boiler

- When removing any water carrying components ensure that the water is kept away from all electrical components.

- Always use new seals and O-rings when replacing parts.

- Always test for gas soundness and always carry out functional checks after any service work and after exchanging any gas carrying components.

- Always check earth continuity, polarity and resistance to earth with a multimeter after any service work and after exchanging any electrical component.

NOTE:

The boiler is fitted with a combustion analysis test point. A suitable combustion analyser can be connected to this point to establish the combustion performance of the boiler.

It is not necessary to check the CO

2

content or adjust the air ratio of the boiler during the annual service. Checking/adjustment of this value is only required in the following instances; replacement of gas valve or fan, conversion from Natural Gas/ LPG or if incorrect combustion is suspected.

CHASSIS

FRONT

SECURING

SCREW

(4 OFF)

CONTROL PANEL

SERVICE POSITION

Fig 14.1

Fig 14.2


27

14 Servicing

14.2 Maintenance

Before commencing any servicing or maintenance work, carry out an initial inspection of the system as follows:

• Inspect the flue, pipework and electrical connections for indications of damage or deterioration.

• Inspect the air supply and ventilation arrangements of the installation.

• Check the heating and water system, in particular the condition of radiator valves, evidence of leakage from the heating system and dripping hot water taps.

14.3 Functional check of boiler operation

• Carry out a functional check of the boiler operation as previously detailed.

• Remove the appliance casing as detailed and operate the boiler.

• Inspect the burner operation through the viewing window.

• Check that the flames are evenly covering the surface of the burner.

• Inspect for signs of excessive flame lift or sooting.

Overview of the maintenance tasks

No. Activity

1 Disconnect the device from the mains supply, close the gas supply and maintenance taps, depressurise the device (observe the manometer)

2 Remove the compact thermal module

3 Clean primary heat exchanger

4 Check whether the burner is dirty

5 Refit compact thermal module, replace burner seal. (Spare part number 981 046)

6 Check whether the electrical plug connections and other connections are fitted tightly and make adjustments, if necessary

7 Check/re-pressurise expansion vessel as necessary

8 Open the maintenance taps, fill up the appliance/system up to approx. 1.0 - 2.0 bar

(depending on the static height of the system)

9 Check appliance generally, check for dust on the appliance and remove in the low-pressure chamber

10 Check and clean condensate trap and connection pipes

11 Clean the condensation waterways in the device

12 Open the gas supply and switch on the deviceXX

13 Perform a test operation of the appliance and heating system, including water heating and evacuate, if necessary

14 Check ignition and burner flame picture

15 Check boiler for any leaks

16 Check the air/gas flue system

17 Check appliance gas setting, reset and record if necessary.

18 Complete benchmark logbook

28


X

X

X

X

X

carry out for: inspection service

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

14 Servicing

14.4 Spark Electrode

Disconnect the ignition lead and earth lead from the igniter unit and two securing screws at the spark electrode. Withdraw the spark electrode carefully from the combustion chamber, see fig 14.3.

Inspect the tips for damage.

Clean away any debris and check the spark gap is

3.5 -4.5 mm.

Check the electrode gasket for signs of damage and replace if necessary.

14.5 Burner

Refer to figs 14.2, 14.4, 14.5 and 14.6.

Isolate the gas supply at the gas service cock.

Disconnect the gas supply at the union nut of the gas service cock.

NOTE:

Do not disconnect at the gas valve.

Remove the two gas pipe bracket securing screws from underside of inner case, see fig 14.4.

Drop down the control panel into the service position.

Remove the four screws from the chassis front, see fig

14.2.

Remove the chassis front by pulling it out at the top from its retaining slots.

NOTE:

When replacing chassis front panel ensure the bottom fits behind lip.

Disconnect the gas control valve plug at the gas control valve, see fig 14.5.

Disconnect the electrical leads from the fan.

Remove the five combustion chamber front securing nuts, see fig 14.6.

Gently remove the fan, gas control valve and burner assembly from the combustion chamber complete with the gas pipe bracket and seal.

Clean the burner with a soft brush taking great care not to damage the front insulation. DO NOT use wire or sharp instruments to clean the holes of the burner.

Inspect the burner for any signs of damage.

Removal of the burner from the fan, gas control valve and burner assembly is not necessary during an annual service.

FLUE

ADAPTER

ELECTRODE

CONNECTOR

IGNITION

LEAD

FAN


Fig 14.3

Fig 14.4

COMBUSTION

ANALYSER

TEST POINT

HEAT

EXCHANGER

COMBUSTION

CHAMBER

FRONT

SECURING

NUTS

(5 OFF)

GAS

CONTROL

VALVE

Fig 14.5

29

14 Servicing

SECURING

NUTS (5

OFF)

COMBUSTION

CHAMBER

BURNER

GAS PIPE

BRACKET

& SEAL

FAN

GAS

CONTROL

VALVE

Fig 14.6

14.6 Combustion Chamber and Heat Exchanger

Refer to fig 14.7.

Remove loose debris from combustion chamber using a soft brush and vacuum cleaner. Carefully flush any remaining debris through the condensate trap (ensure the water is kept away from electrical components).

CAUTION!

The silicone seal, see fig 14.8 on the compact thermal module must be replaced each time the module is removed (for example during maintenance). If the burner flange insulation on the compact thermal module shows any signs of damage other small cracks it must also be replaced.

30

Fig 14.7

Fig 14.8


14 Servicing


The condense drain does not normally need removing during servicing.

To flush the condense drain carefully pour water into the heat exchanger and check that water flows freely to drain.

Refer to fig 14.9. If the condense drain is blocked.

Remove the clips securing the flexible tubes to the siphon adapter by twisting the clips slightly to disengage the clip jaws from each other.

Remove the flexible tubes from siphon adapter.

Lift off the siphon adapter.

Remove the drain connection downstream of the condense trap.

Remove the two condense trap securing screws. Lift up and carefully remove the condense trap taking care not to spill any water which may be left in the unit. As the unit is lifted remove the flexible pipe on the outlet.

Remove any solids found.

Before removing the float note it's orientation.

Remove the float to clean it.

Flush water through the trap to remove any remaining solids.

Check for any debris in the outlet pipe of the condensate drain and clean as necessary.

Reassemble and refit the condense trap.

Using a suitable container, flush the heat exchanger until the water appears clear in the container.

Reassemble siphon adapter.

14.8 Inner Casing Panel Seal Check

Refer to fig 14.10.

Check the condition of the seal, replace as required.

To replace remove the old seal, thoroughly clean the casing surfaces. Fit the new seal, it is supplied to the correct length.

SIPHON

ADAPTER

FLOAT

CONDENSE

TRAP

RETAINING

SCREWS (2)

Fig 14.9


Fig 14.10

31

15 Combustion analysis

NOTE:

The boiler is fitted with a combustion analysis test point. A suitable combustion analyser can be connected to this point to establish the combustion performance of the boiler.

It is not necessary to check the CO

2

content or adjust the air ratio of the boiler during initial commissioning or for the annual service.

Checking/adjustment of this value is only required in the following instances; replacement of gas valve or fan, conversion from Natural Gas/ LPG or if incorrect combustion is suspected.

To carry out a combustion check, connect a CO

2 combustion analyser to the test point on the flue adaptor.

Turn on the gas service cock.

Turn on the electrical supply, and slide the on/off control down to the ‘I’ position to turn on the boiler. Set the timer to continuous and turn up any room thermostats to call for demand.

With the boiler interface in normal operating mode, press and hold the ‘mode’ button ( ) for 10 seconds until a flashing ‘0’ appears.

Press the ‘+‘ key and scroll through until ‘8’ is shown on the left of the screen, then press the ‘mode’ button again.

Fig 15.3

Set the appliance fan speed/burner to maximum by pressing the ‘+’ key until ‘2’ (burner to Pmax) is shown on the right hand side of the screen. Press the ‘mode’ button again to confirm.

Check the CO2 value, which should be 8.8 % ± 0.2

%. Note that with the inner case front panel fitted the combustion reading will increase slightly to

9.0 % ± 0.2 %. Allow the boiler time to reach the maximum rate (approximately 5-10 minutes).

If adjustment proves necessary then proceed as follows.

Any adjustment to be the gas valve should only be carried out by a qualified person. Adjust the maximum rate CO2 with the (‘A’) throttle using a screwdriver to 8.8

% (rotate anti-clockwise to increase).

Fig 15.1

Press the ‘-‘ key and scroll through until ‘96’ (installer mode) is shown on the screen, then press the ‘mode’ button again.

"A" throttle –

"Pmax" rotate to increase

"B" offset adjustment

"Pmin" rotate to increase

Fig 15.4

Fig 15.2

32


15 Combustion analysis 16 Fault finding

Again in screen ‘8’, Set the appliance fan speed/burner to minimum by pressing the ‘-‘ key until ‘1’ (burner to Pmin) is shown on the right hand side of the screen. Press the

‘mode’ button again.

Fig 15.5

Check the CO2 value, which should be 8.8 % ± 0.2 %. If adjustment proves necessary then proceed as follows.

Adjustment of the CO2 at minimum rate is very coarse, so carefully adjust the CO2 with the (‘B’) offset adjustment using a 2mm allen key to 8.8 %, (rotate clockwise to increase).

After checking the combustion, press and hold the ‘mode’ button for 10 seconds to return to the normal mode, showing the current flow temperature. Replace the cap on the sampling point and refit the outer front case.

NOTE:

Depending on the time to take the readings, the display may default back to the normal mode, it may be necessary to repeat steps 3,4 and 5 to adjust the appliance fan speed/burner.

Fault Finding

Logical fault finding procedure

These checks must be carried out before attempting to use the fault finding guide.

1. Carry out electrical safety checks (see section

‘preliminary electrical checks’ 11.2).

2. Check that the external electricity supply to the boiler is on, and a supply of 230V is present at the boiler terminal strip.

3. Check that the gas supply to the boiler is on, that it has been correctly purged and that an inlet pressure of

20mbar is available at the gas valve (see section ‘gas supply’ 12.3).

4. Check that the main on/off control is set to the ‘on’ position.

5. Set the central heating temperature to maximum.

6. Check that all external controls are on and calling for heat.

7. Check that all manual circuit controls ie. bypass, radiator valves are correctly adjusted.

16.1 Status Mode

A series of status mode screens are available for current boiler operating information.

To display the status mode, proceed as follows:

• With the interface in ‘normal’ mode, press and hold the

‘mode’ button ( ) for 10 seconds until a flashing ‘0’ appears (fig. 16.1).

• Press the ‘-‘ key and scroll through until ‘96’ (installer mode) is shown on the screen, then press the ‘mode’ button again.

• A series of screens are then available for service functions. An example is shown in fig 16.2 (screen 23

‘product code’ for the ecoMAX pro 18E).

TESTING GAS

Burner CO2 (G20)

Case Off

9.1+0.2-0.5

Burner CO2

Propane (G31) 10.5+0.3-0.7

Case On

9.3+0.3-0.5

10.7+0.3-0.8

Should any doubt exist about the gas rate, check it using the gas meter test dial and stop watch at least

10 minutes after the burner has lit, making sure that all other gas burning appliances and pilot lights are off.

The approximate gas rates:

18E : 2.0m3/h (70.6ft3/h)

28E : 3.02m3/h (107ft3/h)

* ecoMAX pro 28E only - for LPG see page 23

Fig 16.1


Fig 16.2

33

16 Fault finding

No. Description

8

6

7

4

5

1

2

3

Central heating maximum output

Flue system pressure loss

Minimum temperature for

Central Heating

Maximum temperature for

Central Heating

Pump mode selection

External sensor ‘slope’

External sensor ‘offset’

Burner override Gas rate/CO

2 combustion check

9 Cylinder with NTC

10 Adaptive heating or night-day switch

11 Night-day setpoint (Delta value)

12 Central heating flow temperature

13 Central heating return temperature

14 Domestic hot water temp.

15 Tank temp.

16 DHW flow

17 Extractor speed

18 Burner demand power

19 User interface revision

20 Product code

21 Min. fan speed

22 Max. fan speed

23 Fan speed during ignition

24 Running hours

25 Running hours

26 Fault memory*

27

28

29

30

31 Fault memory reset

Comments 18E

Set minimum to maximum product output (kW)

No function

Set minimum temperature

(22°, 28°, 38° or 50°C)

Set maximum temperature

(50°, 73° or 80° C)

1 – When room stat on (continuous)

2 – When burner on (not continuous)

3 – Winter position/under floor heating (continuous)

No function

No function

0 – normal

1 – burner to Pmin

2 – burner to Pmax

18

38

80

1

0

Immediately communicated to the main board, and reset to 0 after 15 minutes

No function – however if altered to ‘1’ = ON fault code 8 will be displayed ‘tank NTC fault’

No function

No function

°C

°C

No function

No function

No function

Extractor speed, RPM x 100 kW

No function

Code reference for ecoMAX pro

RPM x 100 (800 – 6,000)

RPM x 100 (2,000 – 6,000)

60 – 100%

Flame presence hours stored in E2prom every 2hrs

Memory 1

Memory 2

Memory 3

12

41

80

149

Memory 4

Memory 5

Memory can be reset by pressing ‘+’ and

‘-‘ together

0

12

57

60

141

28E

28

38

80

1

Action adjustable adjustable adjustable adjustable adjustable adjustable adjustable adjustable adjustable

Read only

Read only

Read only

Read only

Read only

Read only

Read only

Read only

Read only

Read only

+/- adjustable adjustable

Read only

Read only

Read only

Read only

Read only

Read only

Read only

Read only

Read only

34


16 Fault finding

16.2 Fault Memory

The fault memory stores details of the five most recent faults. To display the fault memory, proceed as follows;

• With the interface in ‘normal’ mode, press and hold the

‘mode’ button ( ) for 10 seconds until a flashing ‘0’ appears.

• Press the ‘mode’ button again.

• The 5 fault memory screens are now available to be viewed, memory 1 being the most recent. Within each memory screen, 5 additional screens provide further information to assist the installer/engineer.

2

3

No. Memory screen type

1 Fault code

4

Burner phase

DHW temperature

CH flow temperature

5 Tank temperature

Comments

Fault code 1 – 26 (see page 31 – ‘Fault finding’)

Working phase

No function

°C at time of fault

No function

To cancel the fault memory mode proceed as follows;

• Press and hold the ‘mode’ button for 10 seconds until the screen returns to the ‘user’ mode.

16.3 Fault Codes

Fault codes take priority over all other display functions in the event of a system fault occurring.

Code Description

F1

F4

F5

F6

Ignition fault (lockout)

Failed to light

Ignition fault (lockout)

Went out when lit

Overheat fault

Central heating flow NTC fault

F10 Central heating return NTC fault

F11 No reception by main board

F12 No reception by the local user interface

F13 Main board fault

F14 Central heating flow t° > 95° C

Comment

No gas; Insufficient gas; Incorrect gas valve adjustment; Electrode defect;

Ignition lead defect; Electronic igniter defective; Check air inlet duct;

Check connections to igniter unit

As above

Overheat stat operated; Maximum temperature exceeded;

Check thermistor connections; Air in system with thermistor at maximum setting; Faulty overheat stat connection; Check that pump is wired into appliance and not from programmer. This would cause no pump overrun

Flow NTC cable defective/broken NTC faulty

Flow thermistor not fitted correctly, Check pipe work configuration

Return NTC cable defective/broken NTC faulty

Check that thermistor attached correctly to pipe.

Connection fault between main PCB and interface; Faulty interface;

Faulty main PCB (processor), Check fan

As F.11

As F.11

System fault; Possible external pump failure; Check NTC on flow

Check that pump is wired into appliance and not from programmer.

This would cause no pump overrun

F16 Flame detection fault

F17

F18

F19

F26

(flame presence >5 s after burner stop)

Power supply <170 V

Local user interface fault

Central heating NTC unplugged

F25 Maximum temperature rise slope

Maximum delta t

Gas valve defective

Check electrical supply / polarity, Check fan

Connections; Faulty interface

Check NTC connection

F20 MMI software incompatible with IRIS software Possible connection fault

F24 Central heating return t° >90°C System fault; Possible external pump failure; Check NTC on return;

Check that pump is wired into appliance and not from programmer.

This would cause no pump overrun.

Possible external pump failure; Air in system restricting movement of water.

Insufficient circuit flow

Check NTC on return; System fault – too restrictive?; Possible pump failure


35

16 Fault finding (wiring diagram)

16.4 Fault Finding

Fig. 16.3

36


17 Short spare parts

Key No.

1

2

3

4

5

9

10

10

11

6

7

8

Part No.

190260

090750

091258

053574

101771

101191

130837

256271

130839

050469

050470

130838

Description

Fan assembly

Spark electrode

Igniter unit

Gas control valve

Heating flow & return NTC (2)

Overheat stat

Main PCB

Mains/Reset Switch

Main user display interface

Burner - 18 E

Burner - 28 E

230V interface PCB

Fig. 17.1


37

38



39

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