Baxi Megao System 15 - Megao System 18 - Megao System 24 - Megao System 28

Megao System

User Guide

Gas Fired Wall Mounted Condensing System Boiler

15 - 18 - 24 - 28 - 32

United Kingdom

Please keep these instructions in a safe place.

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

2© Baxi Heating UK Ltd 2015

Natural Gas

Baxi Megaflo 15 System ErP

G.C.No41 470 18

Baxi Megaflo 18 System ErP

G.C.No41 470 19

Baxi Megaflo 24 System ErP

G.C.No41 470 20

Baxi Megaflo 28 System ErP

G.C.No41 470 21

Baxi Megaflo 32 System ErP

G.C.No41 470 22

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

Boiler Controls - see opposite page

for Operating Quick Reference Guide

0086

ISO 9001

FM 00866

The Benchmark Scheme

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 regular servicing to optimise

safety, efficiency and performance.

Benchmark is managed and promoted by the Heating and Hotwater Industry

Council. For more information visit www.centralheating.co.uk

1.0 Quick Reference Guide 3

2.0 Troubleshooting 4

3.0 Repressurising System 6

4.0 Clearances 7

5.0 Care of the Boiler 8

6.0 Legislation 9

7.0 Warranty & Service 10

8.0 ErP Information 12

9.0 Emergency 15

10.0 Disposal 15

Section Page

Contents

1.0 Quick Reference Guide

bar

ON/OFF/Reset

Selector Switch

Display Central Heating

Temperature Control

Calibration Control System Pressure Gauge

OFF Position

The boiler will not operate.

Central Heating Temperature Control

Turn the knob clockwise to increase or anticlockwise to decrease the temperature.

Range 25 - 80° C.

Central Heating & Hot Water Indicator - The indicator will illuminate when the boiler is in

the central heating/hot water mode.

Burner On Indicator - The indicator will illuminate when the burner has fired and is heating

your central heating or domestic hot water.

Boiler Output Temperature - In either the central heating or domestic hot water position

the display will illuminate showing the current boiler temperature in degrees centigrade.

Central Heating System Pressure - The normal operating water pressure is between 1 and

2.0 bar. If the pressure exceeds 3 bar the safety pressure valve will operate and a fault is

indicated. Contact your Installer.

Central Heating & Hot Water

Both Heating & Hot Water will operate.

Reset

Hold for approx 5 seconds and release.

Display

Calibration Control

This control is for use only by the installer or service engineer.

2.0 Troubleshooting

4© Baxi Heating UK Ltd 2015

START

Make sure the gas supply is

turned ON and check if other

gas appliances are operating

(e.g. fire, cooker).

If no gas, consult your

supplier.

Is the ON/OFF/Reset

Select Switch in the

( ) position ?

Is the ( ) light on and the

( ) on ?

Check electricity to the

boiler is switched on.

Is the display lit ?

Display

Central Heating

Indicator

Burner On

Indicator

Boiler operating satisfactorily.

bar

Is the Central Heating System

Pressure between 1 and 2.5

bar ?

If the reading falls below 1 bar

repressurise the system as

described in section 3.1.

Does the display show an error

code e.g. E133, E110 ?

Boiler not working

YES YES

YES

Turn the ON/OFF/Reset

Selector Switch to Reset.

Error Code E119 showing low

pressure.

YES

If boiler does not

Reset

2.0 Troubleshooting

Is the Timer ON and calling for

heat ?

Ensure timer is set for Central

Heating ON (see any

instructions supplied with

timer).

Is the Room Thermostat (if

fitted) set high enough ?

Turn Room Thermostat to

maximum setting (typical

example shown).

If you don’t know what you need to do to

get the boiler to light, or need help with

the system and controls, contact your

installer as soon as possible.

YES

CONTACT YOUR

INSTALLER OR

SERVICE ENGINEER.

YES

CH ON CH OFF

Typical

examples of

external timer

3.0 Repressurising System

6© Baxi Heating UK Ltd 2015

3.1 Central Heating System Pressure

1. The normal operating water pressure is between 1

and 2.5 bar (Fig. 1). If the pressure exceeds 3 bar the

safety pressure valve will operate and a fault is indicated.

Contact your installer.

2. It may be necessary to repressurise the system

occasionally (Fig. 2). A filling device (the filling loop) will

be fitted on the system.

3. If you are unsure of its position, or cannot identify it,

consult the installer who fitted the boiler.

4. The filling loop consists of two taps and a separate

metal braided hose with connection fittings.

5. Only when repressurising should the hose be

connected between the two taps. Ensure that the nuts

on the pipe ends are tightened onto the taps.

6. Fully open one of the taps first, and then while

watching the pressure gauge, carefully open the second

tap.

7. When the needle on the gauge is indicating 1 or more

turn both taps off.

8. Disconnect the metal braided hose from the taps (a

small amount of water may be present) and remove it.

Keep the hose in a safe place for future use.

bar

Fig. 1

Fig. 2

Normal Pressure

Requires

Repressurising

4.0 Clearances

Fig. 3

Fig. 4

150mm Min*

780mm

450mm

200mm Min

(300mm Min if

using 80/125mm

flueing system)

5mm Min

450mm Min

For Servicing

Purposes

In Operation

5mm Min 4.1 For your Safety

1. This appliance must have been installed in accordance

with the manufacturer’s instructions and the regulations

in force.

2. Any modification 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.

3. Your boiler must not be operated without the casing

correctly fitted.

4. Do not interfere with any sealed components on this

boiler.

5. Take note of any warning labels on your boiler.

6. Your boiler should have the following minimum

clearances for Safety and Maintenance

(Figs. 3 & 4):-

Top - 200mm

Bottom - 150mm

Left side - 5mm

Right Side - 5mm

Front - 5mm (In Operation)

- 450mm (For Servicing)

*This is the MINIMUM recommended dimension.

Greater clearance than this will aid installation and

maintenance.

7. If your boiler is installed in a compartment, do not use

it for storage purposes. Do not obstruct any purpose

provided ventilation openings.

8. Flammable materials must not be stored in close

proximity to your boiler.

9. Avoid skin contact when your boiler is in operation, as

some surfaces may get hot e.g. pipework.

10. Ensure that the flue terminal, outside the house,

does not become damaged or obstructed, particularly

by foliage.

11. It is important that the condensate drain system is

not blocked, modified or damaged in any way as this

would affect the operation of your boiler. Your installer

should have insulated any exposed pipework.

GB - Heating Industry definition meaning England, Scotland,

Wales, Northern Ireland, Isle of Man and the Channel Isles

5.0 Care of the Boiler

8© Baxi Heating UK Ltd 2015

5.1 Cleaning the Outer case

The painted panels should be wiped with a damp cloth and

then dried completely. DO NOT USE ABRASIVE

CLEANING AGENTS.

5.2 Protection & Precaution

1. The boiler incorporates an integral frost protection feature

that will operate when the selector switch is in ( )

position. If the boiler temperature falls below 5° C, then the

boiler will operate until the water temperature has been

raised.

2. If a system frost thermostat has been fitted (your installer

will be able to advise you), then to operate correctly and

protect your system, the gas and electricity must be left on and

the appliance set in the central heating mode.

3. The boiler incorporates an integral pump protection feature

which continually monitors the time since the pump last

operated. To prevent seizure, the pump will operate for

approximately 1 minute if it has not run in the last 24 hours.

5.3 Fault Indication

1. If a fault occurs on the boiler an error code may be shown

on the facia display.

2. The codes are either two or three digit, preceded by the

letter 'E'. For example, code E133 will be displayed by 'E1'

alternating with '33'. E50 is shown as 'E' then '50'.

3. E20, E28, E50, E125 & E160 indicate faulty components.

You should make a note of the displayed error code and

contact your installer or service engineer.

4. If E110 or E130 is displayed overheat of the primary water

or flue system has occurred. Turn the selector switch to the

reset position and hold for at least 5 seconds. If the boiler

does not relight, or the code is displayed regularly contact your

installer or service engineer.

5. E119 is displayed when the primary water pressure is less

than 0.5 bar. After repressurising the system the boiler should

operate. Your installer will be able to advise you about the

method of repressurising. See page 6 for further details.

6. E133 indicates that the gas supply has been interrupted,

ignition has failed or the flame has not been detected. Ensure

that the gas supply has not been turned off, and turn the

selector switch to the reset position and hold for at least 5

seconds. If the boiler does not relight, or the code is displayed

regularly contact your installer or service engineer.

Central Heating NTC Fault

Flue NTC Fault

Hot Water NTC Fault

Safety Thermostat Operated

Water Pressure Switch Not Operated

Circulation Fault (Primary Circuit)

Flue NTC Operated

Interruption Of Gas Supply or Flame Failure

Fan or Fan Wiring Fault

E20

E28

E50

E110

E119

E125

E130

E133

E160

Table of Error Codes

bar

Display

Then

Fig. 5

6.0 Legislation

6.1 Installation, Commissioning, Service & Repair

1. 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.

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

stated in the Gas Safety (Installation & Use) Regulations.

3. 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.

4. In IE (Eire), this must be carried out by a competent person

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

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

The boiler meets the requirements of Statutory Instrument

“The Boiler (Efficiency) Regulations 1993 No 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 0085.

Product/Production certified by:

Notified Bodies 0086.

For GB/IE only.

6.2 Benchmark Commissioning Checklist

1. Please ensure that the installer has fully completed the

Benchmark Checklist 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 appropriate Building Regulations (England and Wales).

2. All installations must be notified to Local Area Building

Control either directly or through a Competent Persons

Scheme. A Building Regulations Compliance Certificate will

then be issued to the customer who should, on receipt, write

the Notification Number on the Benchmark Checklist.

3. This product should be serviced regularly to optimise its

safety, efficiency and performance. The service engineer should

complete the relevant Service Record on the Benchmark

Checklist after each service.

4. The Benchmark Checklist may be required in the event of

any warranty work.

7.0 Warranty & Service

10 © Baxi Heating UK Ltd 2015

7.1 General

To make sure your boiler warranty is activated and maintained,

it is essential that the:

1. Benchmark checklist is completed by your installer

2. Warranty is registered with Baxi

3. Boiler has an annual service

Please note that failure to adhere to terms and conditions will

make your warranty invalid.

7.2 Standard Warranty Terms and Conditions

Warranty Registration, Service & Repair

For full terms and conditions, visit www.baxi.co.uk/terms.

Benchmark Checklist

The Benchmark Checklist will be completed by your installer

and records that the boiler has been installed and

commissioned correctly. It can be found at the back of the

installation and service manual and should be kept in a safe

place for the life of the boiler. We will check that the

Benchmark Checklist has been completed on an in-warranty

visit.

Ways to register your warranty

If your boiler is eligible for an extended warranty, your installer

may register the product on your behalf and provide you with

the relevant documentation. Please check with your installer.

Should this not be the case, you can register your warranty

online at www.baxi.co.uk/registration

To activate a standard two year warranty, please use one of

the following methods:

• Freephone 0800 013 7989 or

• Return the enclosed registration card

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