Baxi MainEco Combi 24 Handbuch

These instructions include the Benchmark Commissioning Checklist and should be left with the

user for safe keeping. They must be read in conjunction with the Flue Installation Guide.

United Kingdom

24-28-35 / 18-24

Installation and Service Manual

Wall Mounted Gas Condensing Boiler

Baxi MainEco Combi and System

Dear customer,

Thank you for purchasing this appliance.

Please read this manual carefully before using the product and keep it in a safe place for future reference.

In order to ensure continued safe and efficient operation we recommend that the product is regularly maintained. Our Service

and After Sales organization can assist with this.

We hope you will receive many years of satisfactory service.

Contents

1.1 Building Regulations and the Benchmark

Commissioning Checklist ....................................6

1.2 The Benchmark Scheme ......................................6

1.3 Installer Notification Guidelines ..........................7

2Introduction ................................................................................................8

2.1 Symbols used .......................................................8

2.2 Abbreviations ........................................................8

2.3 General ..................................................................8

2.3.1 Manufacturer’s liability .............................................8

2.3.2 Installer’s liability .....................................................9

2.3.3 User’s liability ..........................................................9

2.4 Homologations ....................................................10

2.4.1 Certifications .........................................................10

2.4.2 Additional Directives ..............................................10

3 Safety instructions and recommendations ............................................11

3.1 Safety instructions .............................................11

3.2 Recommendations ..............................................11

4 Technical description ..............................................................................13

4.1 General description ............................................13

4.2 Main parts ............................................................13

4.3 Skeleton Diagrams .............................................14

4.4 Operating principle .............................................14

4.4.1 Gas/air setting .......................................................14

4.4.2 Combustion ...........................................................15

4.4.3 Heating and domestic hot water production ..........15

4.4.4 Control system ......................................................15

4.4.5 Adjustment ............................................................15

4.4.6 Regulation of the water temperature .....................16

4.4.7 Protection against low water or no

circulation ..............................................................16

4.4.8 Overheat temperature protection ..........................16

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4.5 Circulating pump (Available pump head) .........16

4.6 Technical specifications ....................................17

5 Installation ................................................................................................19

5.1 Regulations governing installation ...................19

5.2 Choice of the location ........................................20

5.2.1 Type plate .............................................................20

5.2.2 Location of the boiler .............................................20

5.3 Main dimensions .................................................22

5.4 Positioning the boiler .........................................23

5.5 Hydraulic connections .......................................23

5.5.1 Flushing the system ..............................................24

5.5.2 Water flow rate ......................................................24

5.5.3 Connection of the heating circuit ...........................24

5.5.4 Connection of the water circuit for domestic

use ........................................................................25

5.5.5 Connecting the expansion vessel .........................25

5.5.6 Connecting the safety valve discharge pipe ..........26

5.5.7 Connecting the condensate discharge pipe ..........26

5.5.8 Automatic air bleed ...............................................28

5.6 Gas connection ...................................................29

5.7 Connections for the air and exhaust

pipes ....................................................................29

5.7.1 Classification .........................................................29

5.7.2 Outlets ...................................................................30

5.7.3 Lengths of the air/flue gas pipes ...........................31

5.7.4 Additional Directives ..............................................32

5.7.5 Connection of the combustion gas exhaust

pipe .......................................................................32

5.8 Electrical connections ........................................32

5.8.1 Control unit ............................................................32

5.8.2 Recommendations ................................................33

5.8.3 Access to the connector block / Boiler HMI ...........34

5.8.4 Connection options ...............................................34

5.9 Electrical diagram ...............................................38

5.10 Filling the system ...............................................38

5.10.1 Water treatment ....................................................38

5.10.2 Filling the condensate trap ....................................39

5.10.3 Filling the system ..................................................40

5.10.4 Venting the system ................................................41

Contents

02092014 - 7619497-02 2

6 Commissioning ........................................................................................42

6.1 Control panel .......................................................42

6.2 Check points before commissioning ................43

6.2.1 Preparing the boiler for commissioning .................43

6.2.2 Hydraulic circuit .....................................................43

6.2.3 Electrical connections ...........................................43

6.3 Commissioning the boiler ..................................43

6.4 Gas settings ........................................................45

6.4.1 Gas circuit .............................................................45

6.4.2 Checking combustion ............................................45

6.4.3 Setting the air/gas ratio .........................................48

6.5 Finalizing work ....................................................49

6.6 Parameter descriptions ......................................50

7 Switching off the boiler ............................................................................52

7.1 Installation shutdown .........................................52

7.2 Antifreeze protection ..........................................52

8 Checking and maintenance .....................................................................53

8.1 General instructions ...........................................53

8.2 Standard inspection and maintenance

operations ...........................................................53

8.2.1 Open the boiler ......................................................53

8.2.2 Checking the hydraulic pressure ...........................54

8.2.3 Checking the expansion vessel .............................54

8.2.4 Checking the ionization current .............................54

8.2.5 Checking the DHW transfer capacity ....................55

8.2.6 Checking the flue gas discharge and the air

supply ....................................................................55

8.2.7 Checking combustion ............................................55

8.2.8 Checking the automatic air vent ............................55

8.2.9 Checking the condensate trap ..............................56

8.2.10 Checking the burner and cleaning the heat

exchanger .............................................................57

8.3 Specific maintenance operations ......................58

8.3.1 Replacing the ionization/ignition electrode ............58

8.3.2 Replacing the 3-way valve ....................................59

8.3.3 Cleaning the plate heat exchanger .......................59

8.3.4 Cleaning the domestic water cartridge ..................60

8.3.5 Replacement of the expansion vessel ..................60

8.3.6 Re-assembling the boiler ......................................61

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9 Troubleshooting .......................................................................................63

9.1 Error codes ..........................................................63

9.2 Shutdowns and lock-outs ..................................63

9.2.1 Blocking .................................................................63

9.2.2 Lock out .................................................................65

10 Spare parts ................................................................................................70

10.1 General ................................................................70

10.2 Spare parts ..........................................................70

11 Appendix ...................................................................................................71

11.1 User instruction card ..........................................71

11.2 Gas boiler system commissioning

checklist ..............................................................72

11.3 Service record .....................................................73

Contents

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02092014 - 7619497-02 5

EC declaration of conformity

The device complies with the standard type described in the EG

declaration of conformity. It was manufactured and commissioned in

accordance with European directives.

The original declaration of conformity is available from the

manufacturer.

1.1 Building Regulations and the Benchmark Commissioning Checklist

Building Regulations (England & Wales) require

notification of the installation of a heating appliance to the

relevant Local Authority Building Control Department.

This can be achieved via a Competent Persons Self

Certification Scheme as an option to notifying the Local

Authority directly.

The Health & Safety Executive operates the ’Gas Safe

appliances.

This company is a member of the Benchmark initiative

and fully supports the aims of the programme. Its aim is

to improve the standards of installation and

commissioning of central heating systems in the UK and

to encourage the regular servicing of all central heating

systems to ensure safety and efficiency.

Building Regulations require that installations should

comply with manufacturer’s instructions. It is therefore

important that the commissioning checklist is completed

by the installer. The relevant section of Building

Regulations only relates to dwellings. Therefore the

checklist only applies if the appliance is being installed in

a dwelling or some related structure.

The flowchart opposite gives guidance for installers on the

process necessary to ensure compliance with Building

Regulations.

1.2 The Benchmark Scheme

Benchmark places responsibilities on both manufacturers

and installers. The purpose is to ensure that customers

are provided with the correct equipment for their needs,

that it is installed, commissioned and serviced in

accordance with the manufacturer’s instructions by

competent persons and that it meets the requirements of

the appropriate Building Regulations. The Benchmark

Checklist can be used to demonstrate compliance with

Building Regulations and should be provided to the

customer for future reference.

Installers are required to carry out installation,

commissioning and servicing work in accordance with the

Benchmark Code of Practice which is available from the

Heating and Hotwater Industry Council who manage and

promote the Scheme. Visit www.centralheating.co.uk

for more information.

R000725-A

Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24

602092014 - 7619497-02

1.3 Installer Notification Guidelines

R000696-01

Choose Building

Regulations Notification

Route

Contact your relevant Local

Authority Building Control

(LABC) who will arrange

an inspection or contact

a government approved

inspector

LABC will record the data

and will issue a

certificate of compliance

‘Gas Safe Register’ will issue a

Building Regulations Compliance

Certificate to the property owner

and inform the relevant LABC

You must ensure that the

certificate number issued by

the ‘Gas Safe Register’ is written

onto the Benchmark Checklist

Scheme Members only

Call ‘Gas Safe Register’ on:

0800 408 5577

or log onto:

www.gassaferegister.co.uk

within 10 days

If you notify via the ‘Gas Safe

the Building Regulations

certificate on members’ behalf

Complete the

Benchmark Checklist

Install and Commission this

appliance to manufacturer's

instructions

Competent Person's

Self Certification Scheme

Building Control

Complete the

Benchmark Checklist

Install and Commission this

appliance to manufacturer's

instructions

Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24

02092014 - 7619497-02 7

2 Introduction

2.1 Symbols used

In these instructions, various danger levels are employed to draw the

user’s attention to particular information. In so doing, we wish to

safeguard the user’s safety, highlight hazards and guarantee correct

operation of the appliance.

DANGER

Risk of a dangerous situation causing serious physical

injury.

WARNING

Risk of a dangerous situation causing slight physical

injury.

CAUTION

Risk of material damage.

Signals important information.

¼Signals a referral to other instructions or other pages in the

instructions.

2.2 Abbreviations

4LTH: Low temperature heating

4DHW: Domestic hot water

4HRU: Heat Recovery Unit

4PCU: Primary Control Unit - Electronic system to control burner

function

4SCU: Secondary Control Unit - Additional electronic system

2.3 General

2.3.1. Manufacturer’s liability

Our products are manufactured in compliance with the requirements

of the various applicable European Directives. They are therefore

delivered with [ marking and all relevant documentation.

2. Introduction Baxi MainEco Combi and System 24 - 28 - 35 / 18 - 24

802092014 - 7619497-02

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