Baxi MainEco Heat Installation and Service Manual

Installation and Service Manual

Gas Fired Wall Mounted Condensing Boiler

en

United Kingdom

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.

B

Baxi MainEco Heat

15 - 18 - 24

2 MainEco Heat 7219721 - 01 (04/15)

You have just purchased one of our appliances and we thank you for the trust you have placed in our products. Please note that

the product will provide good service for a longer period of time if it is regularly checked and maintained. Our customer support

network is at your disposal at all times.

0086

ISO 9001

FM 00866

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.

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 Register’, a self-

certification scheme for gas heating 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.

Model Range

Baxi MainEco 15 Heat ErP

G.C.N

o

41-470-40

Baxi MainEco 18 Heat ErP

G.C.N

o

41-470-41

Baxi MainEco 24 Heat ErP

G.C.N

o

41-470-42

7219721 - 01 (04/15) MainEco Heat 3

1

Installer Notification Guidelines

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

Register’, the register will issue

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

Installer Notification Guidelines

4 MainEco Heat 7219721 - 01 (04/15)

This page is intentionally blank

7219721 - 01 (04/15) MainEco Heat 5

Contents

1 Introduction

1.1 General

1.2 Additional Documentation

1.3 Symbols Used

1.4 Abbreviations

1.5 Extent of Liabilities

1.5.1 Manufacturer’s Liability

1.5.2 Installer’s Liability

1.6 Homologations

1.6.1 Certifications

1.6.2 Directives

1.6.3 Standards

2 Safety

2.1 General Safety Instructions

2.2 Recommendations

2.3 Specific Safety Instructions

2.3.1 Handling

3 Technical Specifications

3.1 Technical Data

3.2 Technical Parameters

3.3 Dimensions and Connections

3.4 Electrical Diagram

4 Description of the Product

4.1 General Description

4.2 Operating Principle

4.3 Main Components

4.4 Control Panel Description

4.4.1 User Interaction Controller

4.5 Standard Delivery

4.6 Accessories & Options

4.6.1 Optional Extras

5 Before Installation

5.1 Installation Regulations

5.2 Installation Requirements

5.2.1 Gas Supply

5.2.2 Electrical Supply

5.2.3 Hard Water Areas

5.2.4 Bypass

5.2.5 System Control

5.2.6 Treatment of Water Circulating Systems

5.2.7 System Details - General

5.2.8 Low Head Installation / Open

5.2.9 Sealed Systems Details

5.3 Choice of the Location

5.3.1 Location of the Appliance

5.3.2 Data Plate

5.3.3 Bath & Shower Rooms

5.3.4 Ventilation

5.3.5 Condensate Drain

5.3.6 Clearances - Access in Service

5.3.7 Flue / Chimney Location

5.3.8 Horizontal Flue / Chimney Systems

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

31

32

34

6 MainEco Heat 7219721 - 01 (04/15)

Contents

5.3.9 Flue/Chimney Trim

5.3.10 Terminal Guard

5.3.11 Flue/Chimney Deflector

5.3.12 Flue/Chimney Accessories

5.4 Unpacking & Initial Preparation

5.4.1 Unpacking

5.4.2 Initial Preparation

5.4.3 Making the Water Connection

5.4.4 Filling the Condensate Trap

5.4.5 Connecting the Condensate Drain

5.4.6 Connecting the Gas Supply

6 Installation

6.1 Air Supply / Flue Gas Connections

6.1.1 Connecting the Top Flue

6.2 Electrical Connections

6.2.1 Electrical Connections of the Appliance

6.2.2 Connecting External Devices

6.3 Filling the System

6.4 Completing the Installation

6.4.1 Completion

7 Commissioning

7.1 General

7.2 Checklist before Commissioning

7.2.1 Preliminary Electrical Checks

7.2.2 Checks

7.3 Commissioning Procedure

7.4 Gas Settings

7.4.1 ‘Chimney Sweep’ Mode

7.4.2 ‘Chimney Sweep’ Mode - Combustion Check

7.5 Configuring the System

7.5.1 Check the Operational (Working) Gas Inlet Pressure & Gas Rate

7.6 Final Instructions

8 Operation

8.1 General

8.2 Start-Up

8.3 Shutdown

8.4 Use of the Control Panel

8.5 Frost Protection

9 Settings

9.1 Parameters

35

36

37

38

40

41

42

43

44

45

46

47

48

49

7219721 - 01 (04/15) MainEco Heat 7

Contents

10 Maintenance

10.1 General

10.2 Standard Inspection & Maintenance Operation

10.3 Specific Maintenance Operation

10.3.1 Spark Ignition Electrode

10.3.2 Automatic Air Vent

10.3.3 Condensate Trap

10.3.4 Removal of Ducts

10.3.5 Pressure Switch (21 & 24 only)

10.3.6 Flow Temperature Sensor

10.3.7 Overheat Sensor

10.3.8 Return Temperature Sensor

10.3.9 Parameter Unit

10.3.10 Gas Valve

10.3.11 Control & Fan Assembly

10.3.12 User Interaction Controller

10.3.13 Setting the Gas Valve (CO

2

Check)

11 Troubleshooting

11.1 Error Codes - Auto Reset

11.2 Lockout Condition

12 Decommissioning Procedure

12.1 Decommissioning Procedure

13 Spare Parts

13.1 General

13.2 Spare Parts List

Benchmark Commissioning Checklist

50

51

52

53

54

55

56

58

59

60

600

61

62

8 MainEco Heat 7219721 - 01 (04/15)

1 Introduction

1.1 General

WARNING

Installation, repair and maintenance must only be

carried out only by a competent person. This

document is intended for use by competent persons,

WARNING

Check the information on the data plate is

compatible with local supply conditions.

All Gas Safe registered engineers carry an ID card with their

licence number and a photograph. You can check your engineer

is registered by telephoning 0800 408 5500 or online at

www.gassaferegister.co.uk

This appliance must be installed in accordance with the

manufacturer’s instructions and the regulations in force. If the

appliance 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. Read the instructions fully before installing or using the

appliance.

In GB, this must be carried out by a competent person as stated

in the Gas Safety (Installation & Use) Regulations (as may be

amended from time to time).

Definition of competence: A person who works for a Gas Safe

registered company and holding current certificates in the

relevant ACS modules, is deemed competent.

In IE, this must be carried out by a competent person as stated

in I.S. 813 “Domestic Gas Installations”.

The addition of anything that may interfere with the normal

operation of the appliance without express written permission

from the manufacturer or his agent could invalidate the

appliance warranty. In GB this could also infringe the Gas Safety

(Installation and Use) Regulations.

The appliance is designed as a boiler for use in residential

domestic environments 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.

7219721 - 01 (04/15) MainEco Heat 9

Introduction 1

1.3 Symbols Used

DHW: Domestic hot water

CH: Central heating

GB: Great Britain

IE: Ireland

BS: British standard

HHIC: Heating and Hotwater Industry Council

CSM: Chimney Sweep Mode

PU: Parameter Unit

PCB: Printed Circuit Board

Pn: Nominal output

Qn: Nominal heat input

Hs: Gross calorific value

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 .

Signals a referral to other instructions or other pages

in the instructions.

1.4 Abbreviations

1.2 Additional Documentation

These Installation & Service Instructions must be read in

conjunction with the Flue Accessories & Fitting Guide supplied in

the Literature Pack.

Various timers, external controls, flue accessories, etc. are

available as optional extras. Full details are contained in the

relevant sales literature.

In these instructions, various levels are employed to draw the

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

safeguard the user's safety, prevent hazards and guarantee

correct operation of the appliance. Each level is accompanied by

a warning triangle

10 MainEco Heat 7219721 - 01 (04/15)

1 Introduction

1.5 Extent of Liabilities

1.5.1 Manufacturer's Liability

Our products are manufactured in compliance with the

requirements of the various european applicable Directives.

They are therefore delivered with marking and all relevant

documentation. In the interest of customers, we are

continuously endeavouring to make improvements in product

quality. All the specifications stated in this document are

therefore subject to change without notice.

The manufacturer will not accept any liability for loss, damage or

injury arising as a result of:-

Failure to abide by the instructions on using the appliance.

Failure to regularly maintain the appliance, or faulty or

inadequate maintenance of the appliance.

Failure to abide by the instructions on installing the

appliance.

This company declares that no substances harmful to

health are contained in the appliance or used during

appliance manufacture.

The appliance is suitable only for installation in GB and IE and

should be installed in accordance with the rules in force, and

only used in a suitably ventilated location.

In GB, the installation must be carried out by a Gas Safe

Registered Installer. It must be carried out in accordance with

the current and relevant requirements of legislation and

guidance including the:-

• Gas Safety (Installation & Use) Regulations.

• The appropriate Building Regulations either The

Building Regulations, The Building Regulations

(Scotland), Building Regulations (Northern Ireland).

• The Water Fittings Regulations or Water Byelaws in

Scotland.

• 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.

Prior to commissioning all systems must be thoroughly

flushed and treated after installation with inhibitor (see

section 5.2.6). Failure to do so will invalidate the appliance

warranty.

Incorrect installation could invalidate the warranty and may lead

to prosecution.

7219721 - 01 (04/15) MainEco Heat 11

Introduction 1

1.5.2 Installer's Responsibility

The installer is responsible for the installation and initial start up

of the appliance. The installer must adhere to the following:

Read and follow the instructions given in the manuals

provided with the appliance.

Carry out installation in compliance with the prevailing

legislation and standards.

Ensure the system is flushed and inhibitor added.

Install the flue/chimney system correctly ensuring it is

operational and complies with prevailing legislation and

standards, regardless of location of the boiler’s installation.

Only the installer should perform the initial start up and carry

out any checks necessary.

Explain the installation to the user.

Complete the Benchmark Commissioning Checklist - this is a

condition of the warranty !

Warn the user of the obligation to check the appliance and

maintain it in good working order.

Give all the instruction manuals to the user.

1.6 Homologations

1.6.1 Certifications

EC - Declaration of Conformity

Baxi Heating Uk Limited being the manufacturer / distributor

within the European Economic Area of the following

Baxi MainEco Heat ErP

declare that the above is in conformity with the provisions of the

Council Directive

2009/142 EC 92/42 EEC 2004/108 EC 2006/95 EC

2009/125/EC 2010/30/EU

and has been subject to the following conformity procedures laid

down in

Annex 2 - Article 3 of 2009/142 EC

under the supervision of the British Standards Institution, a

Notified Body authorized by the United Kingdom Competent

Authority, and carrying the Notified Body Number 0086.

1.6.2 Directives

The boiler meets the requirements of Statutory Instrument “ The

Boiler (Efficiency) Regulations 1993 N

o

3083” and is deemed to

meet the requirements of Directive 92/42/EEC on the energy

efficiency requirements for new hot water boilers fired with liquid

or gaseous fuels:-

Type test for purpose of Regulation 5 certified by:

Notified Body 0063.

Product/Production certified by:

Notified Body 0086.

For GB/IE only.

12 MainEco Heat 7219721 - 01 (04/15)

1 Introduction

1.6.3 Standards

Codes of Practice - refer to the most recent version

In GB the following Codes of Practice apply:

Standard Scope

BS 6891 Gas Installation.

BS 5546 Installation of hot water supplies for domestic

purposes.

BS EN 12828 Heating systems in buildings.

BS EN 12831 Heating systems in buildings - Calculation of

load.

BS EN 14336 Installation & commissioning of water based

heating systems.

BS 6798 Installation of gas fired hot water boilers.

BS 5440 Part 1 Flues.

BS 5440 Part 2 Ventilation.

BS 7074 Expansion vessels and ancillary equipment for

sealed water systems.

BS 7593 Treatment of water in domestic hot water

central heating systems.

In IE the following Codes of Practice apply:

Standard Scope

I.S. 813 Domestic Gas Installations.

The following standards give valuable additional information;

BS 5546 Installation of hot water supplies for domestic

purposes.

BS EN 12828 Heating systems in buildings.

BS EN 12831 Heating systems in buildings - Calculation of

load.

BS EN 14336 Installation & commissioning of water based

heating systems.

BS 7074 Expansion vessels and ancillary equipment for

sealed water systems.

BS 7593 Treatment of water in domestic hot water

central heating systems.

7219721 - 01 (04/15) MainEco Heat 13

Safety 2

2 Safety

2.1 General Safety Instructions

2.2 Recommendations

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

WARNING

Installation, repair and maintenance must be carried

out by a Gas Safe Registered Engineer

(in accordance with prevailing local and national

regulations).

When working on the boiler, always disconnect the

boiler from the mains and close the main gas inlet

valve.

After maintenance or repair work, check the

installation to ensure that there are no leaks.

CAUTION

The boiler should be protected from frost.

Only remove the casing for maintenance and repair

operations. Replace the casing after maintenance

and repair operations.

14 MainEco Heat 7219721 - 01 (04/15)

2 Safety

2.3 Specific Safety Instructions

2.3.1 Handling

General

• The following advice should be adhered to, from when first

handling the boiler to the final stages of installation, and

also during maintenance.

• Most injuries as a result of inappropriate handling and lifting

are to the back, but all other parts of the body are

vulnerable, particularly shoulders, arms and hands. Health

& Safety is the responsibility of EVERYONE.

• Before lifting the boiler, the circumstances of the installation

must be assessed, please use appropriate manual handling

techniques and equipment.

• Do not handle or lift unless you feel physically able.

• Wear appropriate Personal Protection Equipment

e.g. protective gloves, safety footwear etc.

Preparation

• Co-ordinate movements - know where, and when, you are

both going.

• Minimise the number of times needed to move the boiler -

plan ahead.

• Always ensure when handling or lifting the route is clear

and unobstructed. If possible avoid steps, wet or slippery

surfaces, unlit areas etc. and take special care on

ladders/into lofts.

Technique

• When handling or lifting always use safe techniques - keep

your back straight, bend your knees. Don’t twist - move your

feet, avoid bending forwards and sideways and keep the

load as close to your body as possible.

• Where possible transport the boiler using a sack truck or

other suitable trolley.

• Always grip the boiler firmly, and before lifting feel where the

weight is concentrated to establish the centre of gravity,

repositioning yourself as necessary. See the ‘Installation’

section of these instructions for recommended lift points.

Remember

• The circumstances of each installation are different. Always

assess the risks associated with handling and lifting

according to the individual conditions.

• If at any time when installing the boiler you feel that you

may have injured yourself STOP !! DO NOT ‘work through’

the pain - you may cause further injury.

IF IN ANY DOUBT DO NOT HANDLE OR LIFT THE BOILER -

OBTAIN ADVICE OR ASSISTANCE BEFORE PROCEEDING !

7219721 - 01 (04/15) MainEco Heat 15

Technical Specifications 3

3 Technical Specifications

3.1 Technical Data

NOTE: All data in this section are nominal

values and subject to normal production

tolerances.

Appliance Category CAT I

2H

Horizontal

Flue Terminal Diameter 100mm

Dimensions Projection 125mm

Outercase Dimensions

Overall Height Inc Flue Elbow - 790mm

Casing Height - 625mm

Casing Width - 370mm

Casing Depth - 270mm

Connections

Gas Supply - 22mm

Central Heating Flow

(compression fitting) - 22mm

Central Heating Return

(compression fitting) - 22mm

Condensate Drain - for 21.5mm

plastic waste pipe

Recommended System

Temperature Drop

Condensing 20°C

Heat Input Qn Hs (Gross)

Max Min

15 model kW 18.32 8.59

18 model kW 21.75 8.59

24 model kW 28.62 8.59

Heat Output Pn

(Non Condensing 70° C Mean Water

Temp)

Max Min

15 model kW 16 7.5

18 model kW 19 7.5

24 model kW 25 7.5

Electrical Supply 230V~ 50Hz

(Appliance must be connected to an

earthed supply)

Power Consumption Max Rate

15 model W 20

18 model W 23

24 model W 33

External Fuse Rating 3A

Internal Fuse Rating (Terminal Strip)

Fuse 1.6T

Appliance Type C

13

C

33

C

53

Nox Class 5

Water Content

litres 1.7

Static Head

max 25 metres

Low Head 0.4m min

System Detail

fully pumped open vented & sealed systems

Electrical Protection IPX4D

CO/CO

2

Ratio Up to a maximum

of 0.004

Flow Temperature (adjustable)

30° C to 80° C (± 5° C)

Max Gas Rate (Natural Gas - G20)

(After 10 Mins)

m

3

/hr

15 model 1.75

18 model 2.07

24 model 2.73

Pressure Switch

12/15/18 Model - Not Fitted

21/24 Model - Fitted

300

250

200

150

100

50

0

0.00.20.40.60.81.01.21.41.61.8

Flow (m

3

hr)

Pressure drop vs Flow

Pressure drop (mbar)

Clearances

Both Sides 5mm Min

Above Casing (Top Flue) 19 0mm Min

Above Casing (Rear Flue) 35mm Min

Below Casing (in Cupboard) 35mm Min

Below Casing 120 mm Min

Front (For Servicing) 800mm Min

Front (In Operation) 5mm Min

See Section 5.3.6 for full details !

Weights

Packaged Boiler Carton 21.5 kg

Installation Lift Weight 19.5 kg

Dynamic (nominal) Inlet Pressure

(Natural Gas - G20)

mbar 20

with a CV of 37.78 MJ/m

3

SAP 2009 Annual Efficiency

15 model - 89.2% 24 model - 89.1%

18 model - 89.2%

This 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 0063.

Product Characteristics Database

(SEDBUK)

16 MainEco Heat 7219721 - 01 (04/15)

3 Technical Specifications

3.2 Technical Parameters

Technical parameters for boiler space heaters

Condensing boiler

Low-temperature boiler

(1)

B1 boiler

Cogeneration space heater

Combination heater

Useful heat output at rated heat output

and high temperature regime

Useful heat output at 30% of rated heat

output and low temperature regime

(1)

Useful efficiency at rated heat output and

high temperature regime

(2)

Useful efficiency at 30% of rated heat

output and low temperature regime

(1)

Full load

Part load

Standby mode

Standby heat loss

Ignition burner power consumption

Annual energy consumption

Sound power level, indoors

Emissions of nitrogen oxides

(1) Low temperature means for condensing boilers 30°C, for low temperature boilers 37°C and for other heaters

50°C return temperature (at heater inlet).

(2) High temperature regime means 60°C return temperature at heater inlet and 80°C feed temperature at heater

outlet.

See

The back cover for contact details.

Baxi MainEco Heat ErP

Rated heat output

Seasonal space heating energy efficiency

Auxiliary electricity consumption

Other items

Prated

kW

P

4

kW

P

1

kW

Š

s

%

Š

4

%

Š

1

%

elmax

kW

elmin

kW

P

SB

kW

P

stby

kW

P

ign

kW

Q

HE

kWh

GJ

L

WA

dB

NO

X

mg/kWh

15 18 24

Yes Yes Yes

No No No

16 19 25

16.019.025.0

5.46.48.4

93 93 93

87.987.887.7

98 98 98

0.02 0.023 0.033

0.014 0.014 0.014

0.028 0.028 0.028

000

---

13764 16344 21506

50 59 77

33 34 37

20 21 24

7219721 - 01 (04/15) MainEco Heat 17

Technical Specifications 3

3.3 Dimensions and Connections

IMPORTANT: The 1.5° fall provided by the elbow is

to allow condensate to run back to the boiler, for

disposal through the condensate discharge pipe.

When using extensions the fall along the flue

system must be increased to 3°.

Where extensions are used ensure the clearance

above the top of the flue elbow (X) is as shown in

the table below:-

360° Orientation

Tube Ø 100mm

D

C

B

A

E

F

At Least 3°

At Least

1.5°

Flue length (Y)

up to 1m

1m - 2m

2m - 3m

3m - 4m

4m - 5m

5m - 6m

Clearance (X)

30mm

84mm

134mm

186mm

238mm

290mm

NOTE: There must be no part of the air duct

(white tube) visible outside the property after

installation. The flue seal should fit neatly and

effect a good seal.

G

X

Y

6m max

DIMENSIONS

A 625mm

B 270mm

C 370mm

D 116mm Ø Min.

E 165mm

F 155mm

G 110mm

H 550mm

For clearances see

Section 5.3.6

18 MainEco Heat

3 Technical Specifications

7219721 - 01 (04/15)

3.4 Electrical Diagram

Gas Valve

Safety

Thermostat

Return

Sensor

Flow

Sensor

Parameter

Unit

Pressure

Switch (where

fitted)

Electrode

User Interaction

Controller

r

b

br

b

g/y

r

Not used

Loop Connector

(where no pressure

switch fitted)

Mains

Electrical

Test Point

g/y

br

b

L

N

Key To Wiring Colours

b - Blue

r - Red

br - Brown

g/y - Green/Yellow

All other wires are black

7219721 - 01 (04/15) MainEco Heat 19

Description of the Product 4

4 Description of the Product

4.1 General Description

1. The Baxi MainEco Heat Range are gas fired wall mounted

powered flue condensing boilers.

2. The maximum output of the boiler is :-

15 model - 16 kW

18 model - 19 kW

24 model - 25 kW

3. The boiler modulates automatically to the system load up to

the set output. It is designed for use on Natural Gas (G20) only.

4. The two illuminated User Interaction Controller push buttons

provide information about the operating condition of the boiler.

5. The boiler is suitable for fully pumped open vented central

heating and domestic hot water systems and sealed systems.

6. An information label giving details of the model, serial number

and Gas Council number is situated on the front left underside of

the outercase and is accessed by pulling forward gently (Fig. 1).

7. The boiler data label is positioned on the inside lower right-

hand side of the boiler and can be seen when the outercase

panel is removed (Fig. 1).

8. The boiler is intended to be installed in residential/domestic

environments on a governed meter supply only.

9. The boiler must be installed with one of the purpose designed

flues such as one of the standard telescopic flue kits detailed in

the Flue Accessories & Fitting Guide.

All systems must be thoroughly cleansed, flushed and

treated with inhibitor (see Section 5.2.6).

These Installation & Servicing Instructions MUST be

read in conjunction with the Flue Accessories & Fitting Guide

supplied in the Literature Pack.

Information

Label

Flip

Downward

Fig. 1

Data Label

20 MainEco Heat

3 Technical Specifications

7219721 - 01 (04/15)

4.2 Operating Principle

1. Switched Live On: When the boiler switched live turns on

the boiler, a 20 second check cycle takes place. If the flow

temperature is less than the boiler set-point temperature the

ignition cycle will start. Pre-purge, Ignition and Burner on.

2. Fan Pre-Purge: The boiler has a 10 second pre-purge (Fan

On, Spark Generator and Gas Valve off) before the start of the

ignition sequence.

3. Ignition: The boiler has a 5 second ignition period (Fan,

Spark Generator and Gas Valve on) and burner on occurs when

a flame is detected. If a flame is not detected within the 5

second ignition period then 4 more ignition attempts are made.

If a flame is not detected after the 5 ignition attempts the boiler

goes to an ignition lock-out and an error code is displayed.

4. Burner on: After a successful ignition, Burner on occurs (Fan

and Gas Valve on, Spark Generator off). The boiler flow

temperature is controlled by varying the fan speed (and thereby

the gas rate) to achieve the optimum boiler operation. If the

boiler flow temperature exceeds the boiler set-point, the burner

will turn off (Fan and Gas Valve off).

5. Overtemperature: If a boiler overtemperature event occurs

(triggering the safety thermostat) the burner shuts down (Fan off

and Gas Valve off). A locking signal is generated and an error

code is displayed.

6. Lockout: If a lock-out error is displayed (Fan, Spark

Generator and Gas Valve off) the boiler can only be reset by

manually pressing the reset button. If 5 lock-outs are reset

within a 1 hour period then boiler becomes inoperable. It is

necessary to switch off the power supply to the boiler, and when

reinstated the reset button pressed again to operate the

appliance.

Any lock-out errors that occur regularly will require further

investigation and rectification.

Technical Enquiries: 0844 871 1555.

Mains On.

(CH or DHW demand)

Self test cycle for 20s

(output setting displayed)

Flow

temperature less

than set point ?

10 second pre-purge

5 second ignition

Burner on

Modulate output

Ignition Lockout

Burner Off

Lockout

Mains Off

(Demand satisfied)

Flame detected ?

5th ignition attempt ?

NO

YES

Flow temp or

rate of rise too

high ?

Over Temp

Fault ?

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Baxi MainEco Heat Installation and Service Manual

Baxi MainEco Heat Installation and Service Manual

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