Baxi Megaflo System 15 HE A Instruction Manual

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© Baxi Heating UK Ltd 2011
Baxi Megaflo System HE IE Range
Gas Fired Wall Mounted Condensing Boiler
User’s Operating Instructions &
Important Warranty Information
Please keep these instructions in a safe place.
If you move house, please hand them over to the next occupier.

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2© Baxi Heating UK Ltd 2011
© Baxi Heating UK Ltd 2011 All rights reserved. No part of this publication may
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
copyright work may be liable to criminal prosecution and civil claims for damages.
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 Notes 10
8.0 Emergency 11
9.0 Warranty & Service 12
Section Page
Contents
Boiler Controls - see opposite page
for Operating Quick Reference Guide
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
ISO 9001
FM 00866
0086

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1.0 Quick Reference Guide
3
© Baxi Heating UK Ltd 2011
2
1
0
4
3
bar
2
1
0
4
3
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 at least 0.2 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.

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2.0 Troubleshooting
4© Baxi Heating UK Ltd 2011
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.
2
1
0
4
3
bar
Is the Central Heating System
Pressure above 0.2 bar ?
If the reading falls below 0.2 bar
see Section 3.1.
Does the display show an error
code e.g. E133, E110 ?
Boiler not working
NO
NO
YES YES
YES
NO
Turn the ON/OFF/Reset
Selector Switch to Reset.
Error Code E119 showing low
pressure.
NO
YES
YES
NO
If boiler does not
Reset

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2.0 Troubleshooting
5
© Baxi Heating UK Ltd 2011
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 ?
15
10
5
20
25
15
10
5
20
25
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
NO
CONTACT YOUR
INSTALLER OR
SERVICE ENGINEER.
YES
12
1
2
3
4
5
6
7
8
9
10
11
CH ON CH OFF
Typical
examples of
external timer
NO

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3.0 System Pressure
6© Baxi Heating UK Ltd 2011
3.1 Central Heating System Pressure
1. The boiler may be installed in two types of heating
system, ‘sealed’ or ‘semi - sealed’. Your installer will be
able to advise you of the type of system and explain the
operation.
2. The ‘sealed’ type is pressurised from the mains by
means of a device called the filling loop, which may also
be used to re-pressurise the system.
3. The ‘semi - sealed’ type relies on a header tank of
water to fill the system through a non - return valve.
This type of system should automatically maintain
suitable pressure.
4. The normal operating water pressure must be at least
0.2 bar (Fig. 1) for the boiler to operate. If the pressure
exceeds 3 bar (Fig. 3) the safety pressure valve will
operate and a fault is indicated. Contact your installer.
‘Sealed’ Systems Only
5. It may be necessary to repressurise the system
occasionally (Fig. 2). A filling device (the filling loop) will
be fitted on the system.
6. If you are unsure of its position, or cannot identify it,
consult the installer who fitted the boiler.
7. The filling loop consists of two taps and a separate
metal braided hose with connection fittings.
8. 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.
9. Fully open one of the taps first, and then while
watching the pressure gauge, carefully open the second
tap.
10. When the needle on the gauge is indicating 0.2 or
more turn both taps off.
11. 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.
‘Semi - Sealed’ Systems Only
12. The header tank on the ‘semi - sealed’ system should
maintain the pressure at a minimum of 0.2 bar. If the
pressure drops below this consult your installer.
2
1
0
4
3
bar
2
1
0
4
3
bar
Fig. 1
Fig. 2
Normal MINIMUM Pressure
Requires
Repressurising
2
1
0
4
3
bar
Fault
Fig. 3

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4.0 Clearances
7
© Baxi Heating UK Ltd 2011
Fig. 4
Fig. 5
150mm Min*
780mm
450mm
200mm Min
(300mm Min if
using 80/125mm
flueing system)
5mm Min
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.
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. 4 & 5):-
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.

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5.0 Care of the Boiler
8© Baxi Heating UK Ltd 2011
5.1 Cleaning the Outer case
1. 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
2
1
0
4
3
bar
Display
Then
Fig. 6

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6.0 Legislation & Maintenance
9
© Baxi Heating UK Ltd 2011
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. The installation must be carried out by a competent
person as stated in I.S. 813 “Domestic Gas Installations”.
6.2 Spare Parts
IMPORTANT - Only a competent person should be
used to service or repair this boiler.
1. Any repairs to the boiler will usually be the
responsibility of the Installer during the guarantee period
after which spare parts may be obtained from
Heatmerchants if required.
2. Quote the appliance name, model number and where
possible the part number when ordering spares. A parts
list is included in the Installation and Servicing Instructions.
3. The name, model number and serial number can be
found on the information label on the back of the hinged
lower door.
6.3 After Sales Service
1. If After Sales Service is required please telephone:-
090 6424 062.
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 0085 & 0086.
For IE only.

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7.0 Notes
10 © Baxi Heating UK Ltd 2011

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8.0 Emergency
11
© Baxi Heating UK Ltd 2011
If you smell gas
Turn off the gas supply at the meter and call your gas
supplier immediately. It is possible to isolate the boiler at
the isolating valve (Fig. 8).
Faulty boiler
If it is known or suspected that a fault exists
on the boiler, it must not be used until the fault
has been corrected by a competent person.
Warning !
Gas Tap
Heating Flow and
Heating Return Inlet
Isolating Valves
Fig. 8
Fig. 9
In an Emergency
If a water or gas leak occurs or is suspected, the boiler can
be isolated at the inlet valves as follows;
1. Using a suitable open ended spanner, turn the square
nut on the gas tap through 90° (1/4turn) in a clockwise
direction to isolate the gas supply at the boiler (Fig. 8).
2. The water isolating valves are positioned under the
boiler and can be closed by turning their taps to the right
towards the wall (Fig. 9).
3. Call your Installer or Service Engineer as soon as
possible.

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© Baxi Heating UK Ltd 2011 UK Comp No5129839 - Iss 5 - 3/11
BAXI
A Trading Division of Baxi Heating UK Ltd (3879156)
Brooks House, Coventry Road, Warwick. CV34 4LL
Website www.baxi.co.uk
e&oe
All descriptions and illustrations provided in this leaflet have been carefully
prepared but we reserve the right to make changes and improvements in
our products which may affect the accuracy of the information contained in
this leaflet. All goods are sold subject to our standard Conditions of Sale
which are available on request.
Contact us
For general enquiries contact branches
nationwide
For technical advice please contact
056 7720 023
For in warranty service contact
090 6424 062
Branches Nationwide
www.heatmerchants.ie
For technical enquiries please contact
[e-mail]
Serial Number
Date of Installation
Installer Details (name, address and contact number(s))
Please complete the boxes below
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