Baxi Megaflo System 28 HE IE LPG Versionshinweis

Supplied By www.heating spares.co Tel. 0161 620 6677

Baxi Megaflo System HE IE Range

Gas Fired Wall Mounted Condensing Boiler

Installation & Servicing Instructions

These instructions include the Commissioning Checklist

and should be left with the user for safe keeping.

Supplied By www.heating spares.co Tel. 0161 620 6677

2© Baxi Heating UK Ltd 2011

Natural Gas

Baxi Megaflo System 15 HE IE

Baxi Megaflo System 18 HE IE

Baxi Megaflo System 24 HE IE

Baxi Megaflo System 28 HE IE

Baxi Megaflo System 32 HE IE

Propane Gas

Baxi Megaflo System 24 HE IE LPG

Baxi Megaflo System 28 HE IE LPG

be reproduced or transmitted in any form or by any means, or stored in any

retrieval system of any nature (including in any database), in each case whether

electronic, mechanical, recording or otherwise, without the prior written

permission of the copyright owner, except for permitted fair dealing under

Copyrights, Designs and Patents Act 1988.

Applications for the copyright owner’s permission to reproduce or make other

use of any part of this publication should be made, giving details of the proposed

use, to the following address:

The Company Secretary, Baxi Heating UK Ltd,

Brooks House, Coventry Road, Warwick. CV34 4LL

Full acknowledgement of author and source must be given.

WARNING: Any person who does any unauthorised act in relation to a

ISO 9001

FM 00866

0086

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Legislation

Codes of Practice - refer to the most recent version

IMPORTANT - Installation, Commissioning, Service & Repair

This appliance must be installed in accordance with the manufacturer’s instructions and

the regulations in force. Read the instructions fully before installing or using the

appliance.

The installation 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.

Warning - Check the information on the data plate is compatible with local supply

conditions.

This company declare that no substances harmful to health

are contained in the appliance or used during appliance

manufacture.

The appliance is suitable only for installation in IE and should

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

used in a suitably ventilated location.

Where no specific instructions are given, reference should be

made to the relevant British Standard Code of Practice.

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.

All systems must be thoroughly flushed and treated with

inhibitor (see section 6.2).

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 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.

The boiler meets the requirements of Statutory Instrument “ The Boiler (Efficiency)

Regulations 1993 No3083” 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 0085.

Product/Production certified by:

Notified Bodies 0085 & 0086.

For IE only.

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4© Baxi Heating UK Ltd 2011

Safe Manual 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.

There is no ‘safe’ limit for one man - each person has different capabilities. The boiler should be handled and lifted by TWO PEOPLE.

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 asses 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 !!

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CONTENTS

1.0 Introduction 6

2.0 General Layout 7

3.0 Appliance Operation 8

4.0 Technical Data 9

5.0 Dimensions and Fixings 11

6.0 System Details 12

7.0 Site Requirements 14

8.0 Flue Options 18

9.0 Plume Displacement 23

10.0 Installation 27

11.0 Commissioning 32

12.0 Completion 34

13.0 Servicing 35

14.0 Changing Components 37

15.0 Setting the Gas Valve 45

16.0 Electrical 46

17.0 Short Parts List 47

18.0 Fault Finding 48

Commissioning Checklist 54

Section Page

Supplied By www.heating spares.co Tel. 0161 620 6677

6© Baxi Heating UK Ltd 2011

1.0 Introduction

1.1 Description

1. The Baxi Megaflo System HE IE is a fully automatic gas fired

wall mounted condensing system boiler. It is room sealed and

fan assisted.

2. The boiler is set to give a maximum output of :-

15 models - 15 kW

16.2 kW (Condensing)

18 models - 18 kW

19.4 kW (Condensing)

24 models - 24 kW

25.9 kW (Condensing)

28 models - 28 kW

30.3 kW (Condensing)

32 models - 32 kW

34.4 kW (Condensing)

3. It is designed for use on either Natural Gas (G20), or

Propane (G31) as indicated by the suffix LPG in the model

name. Two Propane models are available, the Baxi Megaflo

System 24 HE IE LPG & 28 HE IE LPG

4. The boiler incorporates a circulating pump and expansion

vessel. It is suitable for use only on fully pumped sealed

systems.

5. The boiler data badge gives details of the model and serial

number, and is situated on the inner door panel. It is visible

when the case front panel is removed (Fig. 1).

6. The boiler model name and serial number are also shown

on the information label on the rear of the lower door panel.

This is for user reference.

7. The boiler is intended to be installed in residential /

commercial / light industrial E.M.C. environments on a

governed meter supply only.

8. The boiler must be installed with one of the purpose

designed flues such as the standard horizontal telescopic flue

kit, part no. 5118069.

9. All systems must be thoroughly flushed and treated with

inhibitor (see section 6.1).

1.2 Contents of Pack

The pack contains:-

• Boiler

• Wall Plate (including taps)

• Set of Pipe Connections

• Template & ‘Quick Fit’ Guide

• Literature Pack

Fig. 1

Control Box

Case Front Panel

Data Badge

Information Label

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2.0 General Layout

2.1 Layout

1. Expansion Vessel

2. Automatic Air Vent

3. Circulation Pump

4. Drain Off Point

5. Pressure Relief Valve

6. Selector Switch

7. Central Heating System Pressure Gauge

8. PCB

9. Control Box

10. Gas Valve

11. Condensate Trap

12. Flame Sensing Electrode

13. Spark Electrode

14. Primary Heat Exchanger

15. Fan Assembly

16. On/Off/Reset Selector Switch

17. Central Heating Temperature Control

18. Calibration Control

19. Venturi

20. Air/Gas Collector

21. Combustion Box Cover & Burner

22. Igniter

23. Burner On Light

24. Central Heating Mode Light

25. Display

16 17 18 7

bar

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8© Baxi Heating UK Ltd 2011

3.0 Appliance Operation

3.1 Operating Mode (Fig. 2)

1. With a demand for heating or hot water, the pump

circulates water through the primary circuit. If the pressure is

at least 0.2 bar the ignition sequence will start.

2. When the flow temperature exceeds the setting

temperature, a 3 minute delay occurs before the burner

relights automatically (anti-cycling). The pump continues to

run during this period.

3. When the demand is satisfied the burner is extinguished

and the pump continues to run for a period of 3 minutes

(Pump Overrun).

IMPORTANT: When the selector switch is in the ‘0’

(Off) position the electrical supply to the boiler is

isolated. The boiler will not operate.

3.2 Frost Protection Mode

1. The frost protection mode is integral to the appliance and

functions when the selector switch (see Section 2.1) is in the

ON position ( ). If the system temperature falls below

5° C then the boiler will fire on its minimum setting until a

flow temperature of 30° C is reached. Further protection

can be incorporated by using a system frost thermostat.

3.3 Pump Protection

1. With the selector switch (see Section 2.1) in the ON

position ( ) the pump will automatically operate for 1

minute in every 24 hours to prevent sticking.

10 1211

Key

1 Heat Exchanger

2 Burner

3 Ignition Electrode

4 Flame Sensing Electrode

5 Gas Valve

6Pump

7 Automatic Air Vent

8 Pressure Relief Valve

9 Boiler Drain Point

10 Gas Inlet

11 Boiler Flow

12 Boiler Return

13 Pressure Gauge

14 Automatic By-Pass

15 Water Pressure Sensor

16 Safety Thermostat

17 Temperature Sensor

18 Expansion Vessel

19 Return Temperature Sensor

20 Fan

Boiler Primary Circuit

Fig. 2

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4.0 Technical Data

4.1 Megaflo System 15, 18, 24, 28 & 32 HE IE

Flue Terminal Diameter 100mm

Dimensions Projection 125mm

Outercase Dimensions

Casing Height - 780mm

Overall Height Inc Flue Elbow - 965mm

Casing Width - 450mm

Casing Depth - 345mm

Central Heating Primary Circuit

Pressures (Sealed Systems)

bar

Safety Discharge 3

Max Operating 2.5

Min Operating 0.5

Recommended Operating Range 1-2

For ‘Semi-Sealed’ Systems it is recommended that

the system is designed to achieve a pressure of

0.2 bar at the boiler (see Section 6.4).

Pump

Available Head See graph below

Expansion Vessel - (Integral with appliance)

bar

Min Pre-charge Pressure 0.5

litre

Max Capacity of

CH System 125

Primary Water Content

of Boiler (unpressurised) 2.5

Temperatures

Flow Temp (adjustable)

25°C to 80°C max (± 5°C)

NOxClass 5

200 400 600 800 1000 1200

0.5

1.5

2.5

3.5

Metre (wg)

Flow Rate (l/h)

Pump - Available Head

5.5

4.5

Clearances

Above Casing 200 mm Min

Below Casing 150 mm Min*

Front 450 mm Min (For Servicing)

Front 5 mm Min (In Operation)

L.H. Side 5 mm Min

R.H. Side 5 mm Min (In Operation)

*This is the MINIMUM recommended dimension. Greater

clearance will aid installation and maintenance.

Heat Input (Net) Max Min

15 model kW 15.4 4

18 model kW 18.5 4.3

24 model kW 24.7 7

28 model kW 28.9 9.7

32 model kW 32.8 9.7

Heat Output (Non-Condensing)

Max Min

15 model kW 15 3.9

18 model kW 18 4.2

24 model kW 24 6.8

28 model kW 28 9.4

32 model kW 32 9.4

Electrical Supply 230V~ 50Hz

(Appliance must be connected to an

earthed supply)

Power Consumption

15 model 130W

18 model 140W

24 model 150W

28 & 32 models 160W

Electrical Protection

IPX5D

Internal Fuse Rating F2L

Appliance Category CAT I 2H

Inlet Pressure (Natural Gas - G20)

mbar 20

Injector (Natural Gas - G20)

15 model 4.5mm

18 model 5.7mm

24 model 7.5mm

28 model 12mm

32 model 12mm

Appliance Type C13 C33 C53

Heat Output (Condensing)

Max Min

15 model kW 16.2 4.2

18 model kW 19.4 4.5

24 model kW 25.9 7.4

28 model kW 30.3 10.2

32 model kW 34.4 10.2

Max Gas Rate (Natural Gas - G20)

(After 10 mins)

15 model m3/h 1.69

18 model m3/h 1.95

24 model m3/h 2.61

28 model m3/h 3.1

32 model m3/h 3.48

Condensate Drain

To accept 21.5mm (3/4in) plastic waste pipe

Heat Input (Gross) Max Min

15 model kW 17.1 4.4

18 model kW 20.5 4.8

24 model kW 27.4 7.8

28 model kW 32.1 10.8

32 model kW 36.4 10.8

External Fuse Rating 3A

Weights

15 & 18 24

Packaged Boiler Carton 52.5kg 53.5kg

Installation Lift Weight 43kg 44kg

28 & 32

Packaged Boiler Carton 54.5kg

Installation Lift Weight 45kg

Connections copper tails

Gas Supply - 3/4”

Central Heating Flow - 3/4”

Central Heating Return - 3/4”

Pressure Relief Discharge - 1/2”

Supplied By www.heating spares.co Tel. 0161 620 6677

10 © Baxi Heating UK Ltd 2011

4.0 Technical Data

4.2 Megaflo System 24 & 28 HE IE LPG

Flue Terminal Diameter 100mm

Dimensions Projection 125mm

Outercase Dimensions

Casing Height - 780mm

Overall Height Inc Flue Elbow - 965mm

Casing Width - 450mm

Casing Depth - 345mm

Pump

Available Head See graph below

Expansion Vessel - (Integral with appliance)

bar

Min Pre-charge Pressure 0.5

litre

Max Capacity of

CH System 125

Primary Water Content

of Boiler (unpressurised) 2.5

Connections copper tails

Gas Supply - 3/4”

Central Heating Flow - 3/4”

Central Heating Return - 3/4”

Pressure Relief Discharge - 1/2”

Temperatures

Flow Temp (adjustable)

25°C to 80°C max (± 5°C)

NOxClass 5

200 400 600 800 1000 1200

0.5

1.5

2.5

3.5

Metre (wg)

Flow Rate (l/h)

Pump - Available Head

5.5

4.5

Heat Input (Net) Max Min

24 LPG model kW 24.7 7

28 LPG model kW 28.9 9.7

Heat Output (Non-Condensing)

Max Min

24 LPG model kW 24 6.8

28 LPG model kW 28 9.4

Electrical Supply 230V~ 50Hz

(Appliance must be connected to an

earthed supply)

Power Consumption

24 LPG model 150W

28 LPG model 160W

Electrical Protection

IPX5D

Internal Fuse Rating F2L

Appliance Category CAT I I 2H3P

Inlet Pressure (Propane - G31)

mbar 37

Injector (Propane Gas - G31)

24 LPG model 7.5mm

28 LPG model 12mm

Appliance Type C13 C33 C53

Heat Output (Condensing)

Max Min

24 LPG model kW 25.9 7.4

28 LPG model kW 30.3 10.2

Max Gas Rate (Propane Gas - G31)

(After 10 mins)

24 LPG model kg/h 1.92

28 LPG model kg/h 2.25

Condensate Drain

To accept 21.5mm (3/4in) plastic waste pipe

Heat Input (Gross) Max Min

24 LPG model kW 27.4 7.8

28 LPG model kW 32.1 10.8

External Fuse Rating 3A

Weights

24 28

Packaged Boiler Carton 53.5kg 54.5kg

Installation Lift Weight 44kg 45kg

Central Heating Primary Circuit

Pressures (Sealed Systems)

bar

Safety Discharge 3

Max Operating 2.5

Min Operating 0.5

Recommended Operating Range 1-2

For ‘Semi-Sealed’ Systems it is recommended that

the system is designed to achieve a pressure of

0.2 bar at the boiler (see Section 6.4).

Clearances

Above Casing 200 mm Min

Below Casing 150 mm Min*

Front 450 mm Min (For Servicing)

Front 5 mm Min (In Operation)

L.H. Side 5 mm Min

R.H. Side 5 mm Min (In Operation)

*This is the MINIMUM recommended dimension. Greater

clearance will aid installation and maintenance.

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