Baxi 748 Assembly instructions

5118938/02
INSTALLER GUIDE
©Baxi Heating U.K. Limited 2006.
We trust that this guide gives
sufficient details to enable this
appliance to be installed and
maintained satisfactorily. However, if
further information is required, our
Baxi Fires Division Technical
Helpline will be pleased to help.
Telephone [phone] (National
call rates apply in the United
Kingdom).
In the Republic of Ireland
Telephone [phone].
THIS APPLIANCE IS FOR USE WITH
NATURAL GAS (G20).
WHEN CONVERTED USING
CONVERSION KIT NO. 0595221 THIS
APPLIANCE IS FOR USE WITH
PROPANE GAS (G31).
THIS APPLIANCE IS SUITABLE ONLY
FOR INSTALLATION IN THE UNITED
KINGDOM (GB) AND THE REPUBLIC
OF IRELAND (IE).
INSTALLER: Please leave this guide with the owner
Model 748
Inset live fuel effect gas fire
Incorporating the BAXI FIRES DIVISION CONTROL
Fitted with one of the following fascia.
CHIC, ENVY,
HERITAGE, LUXOR, OPULENT or
WESTMINSTER SLIMLINE.
(G.C. Number 32-032-61)
Supplied
X
TER
2-61)
by
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manualslibra
theman
How
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ry.co.uk
R, O
SLI

© Baxi Heating U.K. Limited 2006.
All rights reserved. No part of this publication may be reproduced in any material form
(including photocopying), stored in any medium by electronic means (including in any
retrieval system or database) or transmitted, in any form or by any means, whether
electronic, mechanical, recording or otherwise, without the prior written permission of
the copyright owner.
Applications for the copyright owner's permission to reproduce any part of this
publication should be made, giving details of the proposed use, to the following address:
The Company Secretary, Baxi Heating UK Limited, Pentagon House, Sir Frank Whittle
Road, Derby, DE21 4XA.
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.
Baxi Fires Division, Erdington, Birmingham B24 9QP
www.firesandstoves.co.uk
Because our policy is one of constant development and improvement, details may vary slightly from those
given in this publication
Page 2
INSTALLER GUIDE
© Baxi Heating U.K. Limited 2006.

Safety First.
Baxi Fires Division fires are CE Approved and designed to meet the appropriate British
Standards and Safety Marks.
Quality and Excellence.
All Baxi Fires Division fires are manufactured to the highest standards of quality and
excellence and are manufactured under a BS EN ISO 9001 quality system accepted by
the British Standards Institute.
The Highest Standards
Baxi Fires Division is a member of the Society of British Gas Industries which works to
ensure high standards of safety, quality and performance.
Careful Installation
Baxi Fires Division is a CORGI registered company. All our gas fires must be
installed by a competent CORGI Registered Installer in accordance
with our Installer Guide and should not be fitted directly on to a
carpet or floor of combustible material.
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INSTALLER GUIDE
© Baxi Heating U.K. Limited 2006.

CONTENTS
Section Heading Page
1. SAFETY 5
2. APPLIANCE DATA 6
3. GENERAL INSTALLATION REQUIREMENTS 7
4. PACK CONTENTS 15
5. FIREPLACE CHECK 18
6. IGNITION CHECK 19
7. GAS SUPPLY CONNECTION 20
8. PREPARING APPLIANCE FOR INSTALLATION 20
9. HOTBOX INSTALLATION 22
10. BURNER INSTALLATION 24
10.1 Burner and supply pipe installation. 24
10.2.1 Lighting the burner. 24
10.2.2 Operating the burner. 25
10.3 Inlet pressure check. 25
10.4 Fitting the burner tray trim to the Chic model. 25
11. FITTING THE FASCIA 26
12. FITTING THE CERAMIC FUEL EFFECT 30
13. FULL OPERATING CHECKS 30
14. SPILLAGE & FLAME SUPERVISION CHECKS 31
15. FINAL REVIEW 32
16. SERVICING & PARTS REPLACEMENT 34
16.1 Checking the aeration setting of the burner. 35
16.2 To remove the ignition microswitch. 35
16.3 To remove the gas shut-off microswitch. 36
16.4 To remove the fascia. 36
16.5 To replace the slider control button. 37
16.6 To remove the burner unit. 37
16.7 To remove the electronic ignition generator. 38
16.8 To remove the thermocouple interrupter block. 38
16.9 To remove the pilot unit. 38
16.10 To remove the shut-off tap. 39
16.11 To remove the gas flow rate controller. 40
16.12 To replace the burner. 40
16.13 To remove the main burner injector. 40
16.14 To remove the appliance from the fireplace. 41
Page 4
INSTALLER GUIDE
© Baxi Heating U.K. Limited 2006.

1. SAFETY
Installer
Before continuing any further with the installation of this appliance please read the
following guide to manual handling
!The lifting weight of this appliance is as below: -
Model Hotbox and burner assembly (kg) Fascia (kg)
Chic 5.7 4.1
Envy 5.7 3.11
Heritage 5.7 11.13
Luxor 5.7 12.5
Opulent 5.7 12.5
Westminster 5.7 8.2
!One person should be sufficient to lift the fire. If for any reason this weight is
considered too heavy then obtain assistance.
!
When lifting always keep your back straight. Bend your legs and not your back.
!Avoid twisting at the waist. It is better to reposition your feet.
!Avoid upper body/top heavy bending. Do not lean forward or sideways whilst
handling the fire.
!
Always grip with the palm of the hand. Do not use the tips of fingers for support.
!Always keep the fire as close to the body as possible. This will minimise the
cantilever action.
!Use gloves to provide additional grip.
!Always use assistance if required.
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INSTALLER GUIDE
© Baxi Heating U.K. Limited 2006.

2. APPLIANCE DATA
This product uses fuel effect pieces and a burner compartment rear wall
containing Refractory Ceramic Fibres (RCF), which are man-made vitreous
silicate fibres. Excessive exposure to these materials may cause irritation to eyes,
skin and respiratory tract. Consequently, it is important to take care when
handling these articles to ensure that the release of dust is kept to a minimum. To
ensure that the release of fibres from these RCF articles is kept to a minimum,
during installation and servicing we recommend that you use a HEPA filtered
vacuum to remove any dust and soot accumulated in and around the fire before
and after working on the fire. When replacing these articles we recommend that
the replaced items are not broken up, but are sealed within a heavy duty polythene
bag, clearly labelled as RCF waste. RCF waste is classed as a stable, non-reactive
hazardous waste and may be disposed at a landfill licensed to accept such waste.
Protective clothing is not required when handling these articles, but we recommend
you follow the normal hygiene rules of not smoking, eating or drinking in the work
area and always wash your hands before eating or drinking.
This appliance does not contain any component manufactured from asbestos or
asbestos related products.
* When converted using Kit 0595221
The appliance data label is located on a plate at the base of the fire. This can be seen by
removing the lower hanging trim / firefront casting.
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INSTALLER GUIDE
© Baxi Heating U.K. Limited 2006.
Gas Natural (G20) Propane (G31) *
Inlet Pressure 20mbar 37mbar
Input - Max. (Gross) 6.0kW (20,500Btu/h) 6.1kW (20,800Btu/h)
Input - Min. (Gross) 2.7kW (9,212Btu/h) 4.3kW (14,670Btu/h)
Inlet Test Pressure (Cold) 20.0 ± 1.0mbar (8.0 ± 0.4in
w.g.)
37.0 ± 1.0 mbar (14.85 ±
0.4in w.g.)
Gas Connection 8mm pipe 8mm pipe
Burner Injector Stereomatic Cat 82 - 069 Stereomatic Size 128
Pilot & Atmosphere Sensing
Device Copreci Ref. O.D.S
21500/166
Copreci Ref. O.D.S
21500/166 Fitted with RBM
180 - 02 injector
Ignition Electronic
(Battery 9V PP3) Electronic (Battery 9V PP3)
Aeration See section 16.1 Non-adjustable

The efficiency of this appliance has been measured as specified in BS 7977 - 1 and the
result is 63 % (Gross). The gross calorific value of the fuel has been used for this
efficiency calculation. The test data from which it has been calculated has been certified
by Advantica Certification services (0087). The efficiency value may be used in the UK
Government's Standard Assessment Procedure (SAP) for energy rating of dwellings.
The conversion of net efficiency to gross was achieved by multiplying the net
efficiency by the following conversion factor from Table E3 of SAP 2005, rounding
down to the nearest whole number.
3. GENERAL INSTALLATION REQUIREMENTS
3.1 The installation must be in accordance with this guide.
For the user’s protection, in the United Kingdom it is the law that all gas appliances are
installed by competent persons in accordance with the current edition of the Gas Safety
(Installation and Use) Regulations. Failure to install the appliance correctly could lead
to prosecution. The Council for the Registration of Gas Installers (CORGI) requires its
members to work to recognised standards.
In the United Kingdom the installation must also be in accordance with:
All the relevant parts of local regulations.
All relevant codes of practice.
The relevant parts of the current editions of the following British Standards: -
BS 715
BS EN 1856 Part 1
BS EN 1858 which replaces BS 1289 Part 1
BS EN 1806 which replaces BS 1289 Part 2
BS EN 1856 Part 1 which replaces BS 4543 Part 2
BS 5440 Part 1
BS 5440 Part 2
BS 6461 Part 1
BS 1251
BS EN 1806
BS 5871 Part 2
BS 6891
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INSTALLER GUIDE
© Baxi Heating U.K. Limited 2006.
Gas Conversion factor from net to gross efficiency
Natural Gas 0.901
LPG 0.921

In England and Wales, the current edition of the Building Regulations issued by the
Department of the Environment and the Welsh Office
In Scotland, the current edition of the Building Standards (Scotland) Regulations issued
by the Scottish Executive.
In Northern Ireland, the current edition of the Building regulations (Northern Ireland)
issued by the Department of the Environment for Northern Ireland.
In the republic of Ireland the installation must be carried out by a competent person and
installed in accordance with:
a) The current edition of IS 813 “Domestic gas installations”
b) All relevant national and local rules in force.
c) The current building regulations
Where no specific instructions are given, reference should be made to the relevant
British Standard Code of Practice.
3.2 In the United Kingdom, as supplied, this appliance can be installed in the
following situations: -
3.2.1 A masonry chimney with a minimum diameter of 175mm (7”) free from any
obstruction, and with any damper or restrictor plate in the chimney removed or secured,
and having a minimum effective flue height of 3m (10ft). A masonry chimney having a
correctly installed flue liner to BS EN 1856 or BS 715 and with a minimum flue
diameter of 125mm is also acceptable. Chair brick removal may not be required
providing at least 50mm
clearance is available
from the flue outlet to
any fireplace component.
The appliance is
designed to cater for low
lintel installations (min
height 505mm)
providing a minimum
distance of 25mm is
maintained between the
lintel and the front face
of the fireplace (i.e.
25mm rebated fire
surround).
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INSTALLER GUIDE
© Baxi Heating U.K. Limited 2006.
Figure 1. Hearth and fireplace opening dimensions

3.2.1.1 ‘Hole-in-the-wall’ Installations
! It is recommended that a hearth should be installed as in figure 1.
! Chic, Envy, Heritage and Westminster models.
If a hearth is not fitted, the fire must be installed so that the distance from the base of
the fireplace opening in the wall to the finished floor level is at least 72mm.
Where
there is no floor covering or carpet and the floor is of a type that is likely to be
covered in such a way in the future then the distance from the base of the fireplace
opening in the wall to the floor level should be increased to at least 147mm. The
minimum shelf height will have to be taken from the base of the fireplace opening.
Luxor and Opulent models.
If a reduced depth hearth is fitted fitted, the fire must be installed so that the distance
from the base of the fireplace opening in the wall to the finished floor level is at least
72mm.
It is recommended that the reduced hearth has a depth from the fixing plane
of the fire of 100mm minimum. This is necessary to support the lower front casting.
Where there is no floor covering or carpet and the floor is of a type that is likely to
be covered in such a way in the future then the distance from the base of the
fireplace opening in the wall to the floor level should be increased to at least
147mm.
!
To protect from the risk of burns and ignition of clothing a tactile separator shall be
used. The hearth detailed in section 3.9 meets the requirements for a tactile separator. If
this is not used then a 625mm long fender, kerb, horizontal bar, or other barrier, being
fixed not less than 50mm above floor level
and positioned 300mm in front of the fixing
plane of the fire will meet the requirement.
3.2.2 To a fireplace incorporating a metal
flue box conforming to BS EN 1856 Part 1 or
BS 715 with a minimum internal depth of
150mm. Incombustible mineral wool
insulation of not less than 50mm thickness
must be applied to the top surface of the
hotbox (See figure 2) and it must stand on a
non-combustible hearth (See figure 1).
3.2.3 To a fireplace that has a precast
concrete or clay flue block system
conforming to BS1289 or BS EN 1806. The
appliance is suitable for installations
conforming to older versions of BS1289 as
well as the current edition. The flue blocks
must have a minimum width not less than
63mm and a cross-sectional area not less than
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INSTALLER GUIDE
© Baxi Heating U.K. Limited 2006.
Figure 2. Metal flue box

13,000mm2.Older editions of BS1289
required a cross-sectional area of
13,000mm2. The current revision of the
standard requires 16,500mm2. This
appliance is suitable in both cases. The
total depth of the opening measured from
the finished front of the fireplace
(Including plaster, surround etc.) must be
not less than 120mm (See figure 3).
The current versions of BS1289 and BS
EN 1806 recommend that there should be
an air space or insulation between the
flue blocks and the plaster because heat
transfer may cause cracking on directly
plastered flues. However, generally this
appliance is suitable for installations
under all circumstances unless there is a
history of cracking problems. Remember
that faults such as cracking may be
caused by poorly built and restrictive
flues, e.g. mortar extrusions, too many
bends, flue heights below three metres,
restrictive terminations, etc.
3.2.4 If the fireplace opening is greater
than the acceptable dimensions given in this guide, do not use the back of a fire
surround or marble to reduce the opening. This may cause cracking of the surround
back or marble.
3.3 The following flues are suitable:
! 225mm x 225mm conventional brick flue.
If a flue liner is used, it must be a minimum of 125mm diameter. The liner must
be sealed to the surrounding area above the fireplace opening and to the top of the
chimney. An approved terminal must be fitted.
! A properly constructed precast flue conforming to B.S 1289 or BS EN 1806.
!
A flue pipe with a minimum diameter of 127mm. See B.S 6461 Part 1 for suitable
materials. Metal flue pipes must comply with BS EN 1856 or BS 715.
3.3.1 The minimum effective height of the flue must be 3m.
3.3.2 The flue must be clear of any obstruction and its base must be clear of debris.
3.3.3
The flue must be completely sealed so that combustion products do not come into
contact with combustible materials outside the chimney.
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INSTALLER GUIDE
© Baxi Heating U.K. Limited 2006.
Figure 3. Pre-cast fireplace