Baxi Combi 428, Combi 424, Combi 228, Combi 224 User Manual

Please keep these instructions in a safe place.

If you move house please hand them over to the next occupier.

United Kingdom

User Guide

High Efficiency Wall Hung Condensing Gas Boiler

Baxi Combi

224 – 228 – 424 — 428

Dear Customer,

Thank you very much for buying this appliance.

Please read through the manual carefully before using the product, and keep it in a safe place for later reference. In order to ensure continued safe and efficient operation we recommend that the product is serviced regularly. Our service and customer service organisation can assist with this.

We hope you enjoy years of problem-free operation with the product.

Contents

7661618 - 1 - 04072016 3

Contents

1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.2.1 The Benchmark Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.2.2 Benchmark Commissioning Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3 Liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3.1 User's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

1.3.2 Installer's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.3.3 Manufacturer's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.2 Additional documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3 Symbols used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3.1 Symbols used in the manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4 Abbreviations/glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1 Homologations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1.1 Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

3.2.1 Technical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

3.2.2 Dimensions and connections/clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Description of the product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

4.2 Operating principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.2.1 In operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.3 Control panel description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.3.1 Description of the keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.3.2 Description of the display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

4.4 Accessories and options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.4.1 Optional accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

5.1 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.1.1 Operation checking procedure and basic fault identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2 Use of the control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.1 Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.3 Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.4 Frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.1 List of parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.1.1 Reading out operating parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.2 Setting the parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.2.1 Setting the central heating water temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

6.2.2 Setting the domestic hot water temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

7 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.2 Maintenance instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.2.1 Re-pressurising the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.3 Venting the installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7.4 Draining the installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

8 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

8.1 Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

8.2 Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

9 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

9.1 Decommissioning procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

10 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Contents

4 7661618 - 1 - 04072016

10.1 Disposal and recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

11 Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

11.1 Energy saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

11.2 Room thermostats and settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

12 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

12.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

12.2 Standard warranty terms and conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

13 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

13.1 Product fiche - Combination boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

13.2 Package fiche - boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

13.3 Package fiche - Combination heaters (boiler or heat pumps) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

1 Safety

PN-0000263

7661618 - 1 - 04072016 5

1.1 General safety instructions

1 Safety

Danger This boiler can be used by children aged 8 years and above and by persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge when they have been given supervision or instruction concerning the safe use of the device and understand the resulting risks. Children must not be allowed to play with the appliance. Cleaning and user maintenance must not be carried out by children without supervision.

Danger If you smell gas:

1. Turn off the gas supply at the meter.

2. Open windows and doors in the hazardous area.

3. Do not operate light switches.

4. Do not operate any electrical equipment.

5. Do not use a telephone in the hazardous area.

6. Extinguish any naked flame and do not smoke.

7. Warn any other occupants and vacate the premises.

8. Telephone the National Gas Emergency Service on:- 0800 111 999.

Fig.1 Taps ON and OFF

Note If a water or gas leak occurs or is suspected, the boiler can be iso

lated at the inlet valves by turning their taps through 90° (1/4 turn) downwards.

A ON B OFF For advice please contact your Installer, Annual Service Provider or Baxi Customer Support - The Service Division of Baxi. You can contact Baxi Customer Support on telephone number 0344 871

1545. When contacting Baxi Customer Support it will be useful to have the "Benchmark Checklist " at the back of the Installation & Serv ice Manual to hand as it includes details relevant to the boiler and installation.

Warning Do not touch flue/chimney pipes. Depending on the settings of the appliance, the temperature of flue/chimney pipes may exceed 60 °C. Do not touch radiators for long periods. Depending on the settings of the appliance, the temperature of radiators may reach 85 °C. Take precautions with domestic hot water. Depending on the set tings of the appliance, domestic hot water temperature may reach 65 °C.

Caution Do not neglect to service the appliance. Contact a qualified pro fessional or take out a maintenance contract for the annual servic ing of the appliance.

1 Safety

6 7661618 - 1 - 04072016

1.2 Recommendations

Caution Only qualified professionals are authorised to work on the boiler and the installation. The appliance has an integral frost protection mode as long as there is power to the boiler.

Note Regularly check the water pressure in the system (recommended pressure is 1.5 bar). Keep the appliance accessible at all times. Do not remove or cover the user information and serial number la bels affixed to the boiler control flap. They must remain legible throughout the lifetime of the boiler.

1.2.1

Baxi Heating UK Ltd is a licensed member of the Benchmark Scheme which aims to improve the standards of installation and commissioning of domestic heating and hot water systems in the UK and to encourage regu lar servicing to optimise safety, efficiency and performance.

Benchmark is managed and promoted by Heating and Hotwater Industry Council. For more information visit www.centralheating.co.uk

1.2.2

Please ensure that the installer has fully completed the Benchmark Check list on the inside back pages of the installation instructions supplied with the product and that you have signed it to say that you have received a full and clear explanation of its operation. The installer is legally required to complete a commissioning checklist as a means of complying with the ap propriate Building Regulations (England and Wales).

All installations must be notified, by the installer, to Local Area Building Control either directly or through a Competent Persons Scheme. A Build ing Regulations Compliance Certificate will then be issued to the customer who should, on receipt, write the Notification Number on the Benchmark Checklist.

This product should be serviced annually to optimise its safety, efficiency and performance. The service engineer should complete the relevant sec tion of the Benchmark Service Record in the Installation & Service manual after each service.

The completed Benchmark Checklist & proof of annual servicing (where applicable) will be required in the event of any warranty work.

The Benchmark Scheme

Benchmark Commissioning Checklist

1.3

Liabilities

1.3.1 User's liability

To guarantee optimum operation of the system, you must abide by the fol lowing instructions:

Read and follow the instructions given in the manuals provided with the appliance. Call on a qualified professional to carry out installation and initial com missioning. Get your installer to explain your installation to you. Have the required inspections and maintenance carried out by a quali fied installer. Keep the instruction manuals in good condition close to the appliance.

1 Safety

7661618 - 1 - 04072016 7

1.3.2 Installer's liability

The installer is responsible for the installation and initial commissioning of the appliance. The installer must abide by the following instructions:

Read and follow the instructions given in the manuals provided with the appliance. Install the appliance in compliance with prevailing legislation and stand ards. Carry out initial commissioning and any checks necessary. Explain the installation to the user. If maintenance is necessary, warn the user of the obligation to check the appliance and keep it in good working order. Give all the instruction manuals to the user.

1.3.3 Manufacturer's liability

Our products are manufactured in compliance with the requirements of the various Directives applicable. They are therefore delivered with the marking and any documents necessary. In the interests of the quality of our products, we strive constantly to improve them. We therefore reserve the right to modify the specifications given in this document.

Our liability as manufacturer may not be invoked in the following cases:

Failure to abide by the instructions on installing the appliance. Failure to abide by the instructions on using the appliance. Faulty or insufficient maintenance of the appliance.

2 About this manual

8 7661618 - 1 - 04072016

2 About this manual

2.1 General

Warning Installation, repair and maintenance must only be carried out only by a competent person.

All Gas Safe registered engineers carry an ID card with their licence num ber and a photograph. You can check your engineer is registered by tele phoning 0800 408 5500 or online at www.gassaferegister.co.uk

This manual is intended for the user of the Baxi Combi boiler. If the appli ance is sold or transferred, or if the owner moves leaving the appliance behind you should ensure that the manual is kept with the appliance for consultation by the new owner and their installer.

The appliance is designed as a boiler for use in residential domestic envi ronments on a governed meter supply only. The selection of this boiler is entirely at the owner’s risk. If the appliance is used for purposes other than or in excess of these specifications, the manufacturer will not accept any liability for resulting loss, damage or injury.

The manufacturer will not accept any liability whatsoever for loss, damage or injury arising as a result of failure to observe the instructions for use, maintenance and installation of the appliance.

2.2 Additional documentation

2.3 Symbols used

Various timers, external controls, etc. are available as optional extras. Full details are contained in the relevant sales literature.

2.3.1 Symbols used in the manual

This manual uses various danger levels to draw attention to special in structions. We do this to improve user safety, to prevent problems and to guarantee correct operation of the appliance.

Danger Risk of dangerous situations that may result in serious personal injury.

Danger of electric shock Risk of electric shock.

Warning Risk of dangerous situations that may result in minor personal in jury.

Caution Risk of material damage.

Note Please note: important information.

See Reference to other manuals or pages in this manual.

2.4

Abbreviations/glossary

CH Central heating

DHW Domestic hot water

7661618 - 1 - 04072016 9

PCU PCB for managing burner operation Pnc Condensing output SU Safety PCB

2 About this manual

3 Technical specifications

10 7661618 - 1 - 04072016

3 Technical specifications

3.1 Homologations

3.1.1 Certifications

Tab.1 Certifications

CE certificate number 0085CQ0192

NOx class 5 (EN 15502)

Boiler type C13, C

3.2

Tab.2 General

Tab.3 Heating circuit specifications

Tab.4 Domestic water circuit specifications

Technical data

3.2.1

Baxi Combi 224 228 424 428

Gas council numbers 47–077–21 47–077–22 47–077–23 47–077–24

Baxi Combi 224 228 424 428

Maximum pressure bar 3 3 3 3

Minimum pressure bar 0.5 0.5 0.5 0.5

Heating circuit temperature °C 25/80 ± 5° 25/80 ± 5° 25/80 ± 5° 25/80 ± 5°

Baxi Combi 224 228 424 428

Maximum pressure bar 8.0 8.0 8.0 8.0

Dynamic minimum pressure bar 0.15 0.15 0.15 0.15

Minimum water flow l/min 2.0 2.0 2.0 2.0

Domestic water circuit tempera ture

Specific flow rate (D) l/min 11.5 13.4 11.5 13.4

°C 35/60 ± 5° 35/60 ± 5° 35/60 ± 5° 35/60 ± 5°

Technical information

Note Where low flow taps or fittings are intended to be used in the DHW system connected to the boiler, it is strongly recommended that the DHW flow rate DOES NOT fall below 2.5 l/min. This will ensure reliable operation of the DHW function.

Tab.5 Electrical specifications

Baxi Combi 224 228 424 428

Electrical power supply voltage V 230 230 230 230

Electrical power supply fre quency

Nominal electrical power W 84 94 84 94

External fuse rating Amp 3A 3A 3A 3A

Hz 50 50 50 50

5 6 7

700

279

395

PN-0000264

5.0

285

700

PN-0000205

5.0

178

3 Technical specifications

7661618 - 1 - 04072016 11

Tab.6 Other specifications

Baxi Combi 224 228 424 428

Degree of protection against humidi

IP IPX5D IPX5D IPX5D IPX5D

ty (EN 60529)

Net weight when empty/water load kg 26/28 26/28 26/28 26/28

Dimensions (height/width/depth) mm 700/395/279 700/395/279 700/395/279 700/395/279

Clearances (above/below casing) front (for servicing)/(in operation) side (left hand/right hand)

mm mm mm

178/250* 1000*/6 5/5

* These are recommended dimensions. See fig. 3 for Minimum allowable clearances

Note All data in this section are nominal values and subject to normal production tolerances.

Fig.2

Fig.3

Dimensions and connections

Clearances

3.2.2

1 2 3 4 5 6 7 8

Dimensions and connections/clearances

Safety valve Heating circuit water flow Condensates discharge Heating system/boiler drain tap Domestic hot water outlet Gas inlet Mains cold water inlet

Heating circuit water return A* Clearances below — 200mm minimum, 250mm recommended B* Clearances in front — 450mm minimum, 1000mm recommended The clearances shown in the diagram are minimum requirements to allow for case removal, spanner access and air movement. These should be ob served at all times and kept clear of obstructions.

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