Baxi Bermuda BBU 15 HE Release note

© Baxi Heating UK Ltd 2009
Baxi Bermuda BBU 15 HE
Condensing Back Boiler Unit
These Instructions must be read in conjunction with those for
the separate Valor Dimension electric firefront.
They include the Benchmark Commissioning Checklist
and should be left with the user for safe keeping.
Installation & Servicing Instructions

2© Baxi Heating UK Ltd 2009
Natural Gas
Baxi Bermuda BBU 15 HE
G.C.No. 44 075 09
For use with the following electric firefronts:
Valor Dimension Classica Brass, Pewter or Black BBU Firefront
Valor Dimension Dream Gold, Chrome or Black BBU Firefront
Valor Dimension Innova BBU Firefront
Valor Dimension Regalia BBU Firefront
Valor Dimension Nano Chrome BBU Firefront
Valor Dimension Lyrica BBU Firefront
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. From 1 April 2005 this
can be achieved via a Competent Persons Self Certification
Scheme as an option to notifying the Local Authority directly.
Similar arrangements will follow for Scotland and will apply in
Northern Ireland from 1 January 2006.
The Health & Safety Executive operates the ‘Gas Safe Register’,
a self-certification scheme for gas heating appliances.
These arrangements represent a change from the situation
whereby compliance with Building Regulations was accepted as
being demonstrated by completion of the Benchmark Logbook
(which was then left on site with the customer).
With the introduction of Self Certification Schemes, the
Benchmark Logbook is being withdrawn. However, a similar
document in the form of a commissioning checklist and service
interval record is incorporated at the back of these instructions.
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.
0086
ISO 9001
FM 00866
This product has an energy rating (A) on a scale of A to G.
For more information see www.boilers.org.uk. This is a certification mark.
© Baxi Heating UK Ltd 2009 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, The Wyvern Business Park,
Stanier Way, Derby, DE21 6BF.
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.
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.

Installer Notification Guidelines
3
© Baxi Heating UK Ltd 2009
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

Legislation
4© Baxi Heating UK Ltd 2009
Codes of Practice, most recent version should be used
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 5449 Forced circulation hot water systems.
BS 6798 Installation of gas fired hot water boilers.
BS 5440 Part 1 Chimneys.
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.
Also the following standard includes relevant information about
builders openings:
BS 5871 Part 1 Installation of gas fires, convector heaters,
fire/back boilers and heating stoves.
In IE the following Codes of Practice apply:
Standard Scope
I.S. 813 Domestic Gas Installations.
The following BS standards give valuable additional information;
BS 5546 Installation of hot water supplies for
domestic purposes.
BS 5449 Forced circulation hot water systems.
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.
In GB, this must be carried out by a competent person as stated in the Gas Safety
(Installation & Use) Regulations.
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.
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 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 relevant requirements of 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.
All systems must be thoroughly flushed and treated with
inhibitor (see section 6.2).
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 0087.
Product/Production certified by:
Notified Bodies 0086.
For GB/IE only.
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

Safe Manual Handling
5
© Baxi Heating UK Ltd 2009
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 !!
Working at Height
In order to reduce the number of fatalities and major accidents attributable to working at height, the Health and Safety Executive has introduced comprehensive
regulations and guidance that should be followed by all businesses working at height.
The following paragraphs consider some of the main features of the regulations and guidance. This is, however, only a limited summary and it is recommended
that all businesses planning on undertaking air source heat pump heating installations obtain a copy of the regulations and guidance issued by the Health and
Safety Executive and carefully consider the contents.
The regulations and guidance state that you are required to carry out a risk assessment for all work conducted at height and to put in place arrangements for:
• Eliminating or minimising risks from work at height.
• Safe systems of work for organising and performing work at height.
• Safe systems for selecting suitable work equipment.
• Safe systems for protecting people from the consequences of work at height.
The regulations and guidance highlight a hierarchy for safe work at height:
•Avoid the risk by not working at height if practicable.
•Prevent falls. Where it is not reasonably practicable to avoid work at height, you are required to take suitable and sufficient steps to prevent the risk of a fall
including selecting the most suitable work equipment (in accordance with the regulations).
•Mitigate the consequences of a fall; where the risk of a person or object falling still remains, take suitable and sufficient measures to minimise
the distance and consequences of any fall.
Collective protection measures, such as guard rails on scaffold, should be given priority over personal protection measures, such as safety harnesses.
Within the regulations’ framework, you are required to:
1) Assess the risk to help you decide how to work safely.
2) Follow the hierarchy for safe work at height (i.e. avoid, prevent and mitigate).
3) Plan and organise your work properly, taking account of weather conditions and the possibility of emergencies.
4) Make sure those working at height are competent.
5) Make use of appropriate work equipment.
6) Manage the risks from working on or around fragile surfaces and from falling objects.
7) Inspect and maintain the work equipment to be used and inspect the place where the work will be carried out for both access and egress.

6© Baxi Heating UK Ltd 2009
1.0 Introduction 7
2.0 General Layout 8
3.0 Technical Data 10
4.0 System Details 11
5.0 Site Requirements 15
6.0 Boiler Internal Wiring 20
7.0 Installation 21
8.0 Completion & Commissioning 25
9.0 Annual Servicing 27
10.0 Changing Components 29
11.0 Setting the Gas Valve 33
12.0 Fault Finding 34
13.0 Short Parts List 38
14.0 Notes 39
Benchmark Checklist 42
Section Page
Contents

1.0 Introduction
© Baxi Heating UK Ltd 2009
1.1 Description
1. The Baxi Bermuda BBU 15 HE is a central heating
boiler designed for installation within a builders opening
in the living space of a dwelling.
2. The boiler is a fully automatic gas fired condensing
boiler. It is room sealed and fan assisted.
3. The boiler output will automatically modulate
between:
Max Min
15kW 4.6kW
15.7kW (condensing) 4.83kW (condensing)
According to system load
4. It must be fitted in conjunction with one of the
available electric firefront units as listed on page 2.
The separate electric firefront is intended for hearth
mounting. All instructions, fixings etc. needed to fit the
firefront are included in the firefront pack.
5. These instructions relate to the central heating boiler
section of the appliance (Fig. 1).
6. The appliance is designed for use on NATURAL
GAS (G20) only.
7. It can be used on sealed or open vented systems.
It must NOT be fitted on any type of gravity system.
The boiler is suitable for fully pumped systems ONLY.
8. The boiler is fitted with an integral pump unit for the
removal of condensate.
9. The boiler data badge gives details of the model,
serial number and Gas Council number and is situated
on the front case panel.
10. The boiler is intended to be installed in a residential
environment on a governed meter supply only.
11. The boiler must be installed with one of the
MULTIIFIT vertical concentric Flexi Flue kits available:-
10m kit 720101701 or 12.5m kit 720102001.
12. All systems must be thoroughly flushed and
treated with inhibitor (see section 4.2).
1.2 Contents
1. The boiler pack contains:
• Boiler Unit
• Plumbing Kit
• Condensate Pipe & Elbow
• Fixings Kit
• Literature Pack
2. The flue pack contains:
• Terminal Cap
• Flue Duct Adaptor (inc. seal)
• Air Cowl
• Air Duct Collar (inc. 4 screws)
• Air Duct Clamp
• Closure Plate
• Boiler Concentric
Adaptor (inc. 2 seals)
• 10m or 12.5m of Concentric
Flexible Duct
• 2 x 60mm grey Seals
• 1 x 100mm red Seal
Fig. 1
7
Fig. 2

2.0 General Layout
8© Baxi Heating UK Ltd 2009
2.1 Layout (Fig. 3)
1. Automatic Air Vent
2. Flue Connection
3. Spark Generator
4. Spark & Sensing Electrodes
5. Heat Exchanger
6. Boiler Control Connector
7. Control Wiring Connector
8. Condensate Sump
9. Gas Cock
10. Condensate Pump
11. Fan
12. Drain
13. Return Connection
14. Air Sampling Point
15. Flue Sampling Point
16. Flow Connection
17. Condensate Outlet
18. PCB Control Box (shown removed for clarity)
19. Boiler Control (cover open)
The Boiler Control operates the boiler remotely. This is
supplied with the firefront and is fitted, in operation, to the
firefront spacer frame.
IMPORTANT: To commission the boiler it is is necessary
to remove the Boiler Control from the firefront
packaging and connect it to the boiler at the upper right
hand side (item 6).
1
2
3
4
5
6
7
8
9
10
11
12
13
17
16
15
14
18
Calibration Controls
Fig. 3
19
PCB Control Box
removed for clarity
PCB Control Box

9
© Baxi Heating UK Ltd 2009
2.0 General Layout
2.2 Flue Kit (10m & 12.5m) (Fig. 3a)
1. Terminal Cap
2. Flue Duct Adaptor
3. Air Cowl
4. Air Duct Collar
5. Air Duct Clamp
6. Closure Plate
7. Boiler Adaptor
8. 60mm Ø Seal
9. Collar Securing Screws x 4
10. 100mm Ø Seal
11. 60mm Ø Flue Duct
12. 100mm Ø Air Duct
13. ‘C’ Clip
1
2
3
4
5
6
7
8
9
10
8
11
12
Fig. 3a
13

10 © Baxi Heating UK Ltd 2009
Sedbuk Declaration For Bermuda
BBU 15 HE
The seasonal efficiency (SEDBUK) is 90.1%
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 0087.
Appliance Category CAT I 2H
Inlet Pressure (Natural Gas - G20)
mbar 20
Injector (Natural Gas - G20)
420 (4.2 mm)
Appliance Type C33
3.0 Technical Data
3.1 Bermuda HE CBBU 15 HE
NOxClass 5 (31mg/kWh)
Heat Input (Net) Max Min
kW 15.4 5.0
Heat Input (Gross) Max Min
kW 17.1 5.7
Heat Output (Non-Condensing)
Max Min
kW 15.0 4.88
Heat Output (Condensing)
Max Min
kW 15.7 5.25
Gas Rate (Natural Gas - G20)
(After 10 mins)
Max Min
m3/h 1.63 0.54
Electrical Supply 230V~ 50Hz
(Appliance must be connected to an
earthed supply)
Boiler Power Consumption
112W
Boiler Electrical Protection
IPX0
Boiler External Fuse Rating 3A
Connections
Gas Supply - 15mm compression
Flow - 22mm male copper
Return - 22mm male copper
Weights
Packaged Boiler Carton 28 kg
Installation Lift Weight 27 kg
Flue Length Max Min
Metres 12.5 3.0
Dimensions
Casing Height - 538mm
Casing Width - 383mm
Casing Depth - 306mm
Boiler Set Temperature
Max Min
°C 75 25
Firefront
See the instructions supplied with the firefront for
all Technical Data

4.0 System Details
11
© Baxi Heating UK Ltd 2009
4.1 Water Circulating Systems
1. The appliance is suitable for use on fully pumped
systems ONLY which may be sealed or open vented.
2. The following conditions should be observed at all
times:
The static head must not exceed 30m
of water.
The static head must not be less than
1m of water.
The boiler must not be used with a
direct cylinder.
Drain cocks should be fitted to all
system low points.
All gas and water pipes and electrical
wiring must be installed in such a way
that they do not restrict the servicing of
the boiler.
Position isolating valves as close as
possible to the circulating pump.
There is a drain cock supplied in the
plumbing kit.
4.2 Treatment of Water Circulating
Systems
All recirculatory water systems will be subject to
corrosion unless they are flushed and an appropriate
water treatment is applied. To prevent this, follow the
guidelines given in BS 7593 “Treatment of Water in
Domestic Hot Water Central Heating Systems” and
the treatment manufacturers instructions.
Treatment must involve the use of a proprietary
cleanser, such as Sentinel X300 or X400, or Fernox F3
and an inhibitor such as Sentinel X100 or Fernox MB-1.
Full instructions are supplied with the products, for
further information contact Sentinel (0800 389 4670)
or Fernox (0870 870 0362).
Failure to flush and add inhibitor to the system will
invalidate the appliance warranty.
It is important to check the inhibitor concentration after
installation, system modification and at every service in
accordance with the inhibitor manufacturer’s
instructions. (Test kits are available from inhibitor
stockists.)
For information or advice regarding any of the above
contact Technical Enquiries 0844 871 1555.

4.3 Pipework
1. The sizes of the flow and return pipes from the
boiler should be determined by normal methods
according to the requirements of the system.
2. It is recommended that the system is designed for a
drop in temperature across the system of between
11& 20°C.
3. In systems using non-metallic pipework it is
necessary to use copper pipe for the boiler Flow and
Return. The copper must extend at least 1 metre from
the boiler and include any branches. The copper pipe
must not be insulated (Fig. 4).
4.4 System Controls
1. The system in which the appliance is installed should
include a control system.
2. Such a system would comprise a timer control and a
separate room and/or cylinder thermostat as
appropriate.
3. The boiler should be controlled so that it operates
on demand only.
4.5 Fully Pumped Open Vent System (Fig. 5)
1. The sizes of the system pipes should be determined
by normal methods.
2. The open vent pipe should be a minimum of 22mm
and must rise continuously to a point above the feed
and expansion tank.
3. The flow pipe from the boiler form part of the vent
pipe. No part of the open vent may contain a valve.
4. Inverted pipe runs must be avoided.
5. On low capacity systems with a maximum available
flow rate of less than 8.3l/min (temperature differential
›25°C) an external bypass must be fitted .
6. The bypass must be of the automatic pressure
operated type.
4.6 Storage Systems
1. For information regarding the use of a Bermuda
BBU 15 HE boiler with a storage system, contact the
appropriate storage system manufacturer.
4.0 System Details
12 © Baxi Heating UK Ltd 2009
Air Vent
Boiler
Pump
Radiator
Circuit
Fully Pumped System
22mm
Open Vent
15mm
Cold
Feed
Indirect
Cylinder
Return
Flow
Fig. 5
Boiler
Flow
Return
Copper
0.5m
Copper
1m
Copper
0.5m
Fig. 4

4.0 System Details
13
© Baxi Heating UK Ltd 2009
4.7 Sealed Systems (Figs. 6, 7 & 8)
1. Installation. The installation must comply with the
requirements of BS 6798 and BS EN 12828. The British
Gas publication “British Gas Specification for Domestic
Wet Central Heating Systems” should also be
consulted.
2. Pressure Relief Valve. A non-adjustable spring loaded
pressure relief valve, preset to operate at 3 bar
(45 lbf/in2) shall be used. It must comply with BS 6759:1
and include a manual testing device. It shall be
positioned in the flow pipe either horizontally or
vertically upwards and close to the boiler. No shut off
valves are to be placed between the boiler and the
safety valve. The valve should be installed with a
discharge pipe which permits the safe discharge of
steam and hot water such that no hazard to persons or
damage to electrical components is caused.
3. Pressure Gauge. A pressure gauge incorporating a fill
pressure indicator, covering the range 0-4 bar (60
lbf/in2) shall be fitted to the system. It should be
connected to the system, preferably at the same point
as the expansion vessel. Its location should be visible
from the filling point.
Air Vent
Boiler
Pump
Radiator
Circuit
Fully Pumped Sealed System
Filling
Point
Indirect
Cylinder
Return
Flow
Pressure
Gauge
Safety
Valve
Expansion
Vessel
Fig. 6

4.0 System Details
14 © Baxi Heating UK Ltd 2009
4.7 Sealed Systems (cont)
4. Expansion Vessel. A diaphragm type expansion vessel to
BS 4814:1 shall be fitted close to the inlet side of the pump.
The connecting pipework should not be less than 15mm.
Pipework connecting the expansion vessel should not
incorporate valves of any sort.
Methods of supporting the vessel are supplied by the vessel
manufacturer.
The nitrogen or air charge pressure of the expansion vessel
shall not be less than the hydrostatic head, (height of the
top point of the system above the expansion vessel). To
size the expansion vessel it is first necessary to calculate the
volume of water in the system in litres. The following
volumes may be used as a conservative guide to calculating
the system volume.
Boiler Heat Exchanger: 1.55 litres
Small Bore Pipework: 1 litre per kW of system output
Micro Bore Pipework: 7 litre
Steel Panel Radiators: 8 litre per kW of system output
Low Water Capacity Radiators: 1 litre per kW of system output
Hot Water Cylinder: 1 litre per kW of system output
If the system is extended, the expansion vessel volume may
have to be increased unless provision has been made for
extension. Where a vessel of the calculated size is not
available, the next available larger size should be used.
The boiler flow temperature is controlled at approx. 75°C.
The vessel size can now be determined from the
information in table 1 where V = System volume in litres.
5. Cylinder. The hot water cylinder must be an indirect
coiler type.
6. Method of Make Up. Provision shall be made for
replacing water loss from the system either:-
a) From a make up vessel or tank mounted in a position
higher than the top point of the system and connected
through a non-return valve to the system on the return side
of the hot water cylinder or the return side of all heat
emitters.
or
b) Where access to a make up vessel would be difficult by
using the mains top up method or a remote automatic
pressurisation and make up unit.
7. Mains Connection. There shall be no connection to the
mains water supply or to the water storage tank which
supplies domestic hot water even through a non-return
valve, without the approval of the Local Water Authority.
8. Filling Point. A filling point connection on the central
heating return pipework must be provided to facilitate initial
filling and pressurising and also any subsequent water loss
replacement/refilling.
The sealed primary circuits may be filled or replenished by
means of a temporary connection between the circuit and a
supply pipe, provided a ‘Listed’ double check valve or some
other no less effective backflow prevention device is
permanently connected at the inlet to the circuit and the
temporary connection is removed after use.
The filling method adopted must be in accordance with all
relevant water supply regulations and use approved
equipment.
Your attention is drawn to: for GB: Guidance G24.2 and
recommendation R24.2 of the Water Regulations Guide. for
IE: the current edition of IS 813 “Domestic Gas
Installations”.
Double
Check
Valve
Heating
System
Temporary
Hose
Hose
Union Stop
Valve
Mains Water
Supply
(Service Pipe)
Heating
System
Pressure Pump
Reducing Valve
(if required)
Cistern
Stop
Valve
Mains Water
Supply
Filling a Sealed Water System (Method 1)
Mains Topping Up Method
NOTE: This method of filling a sealed system
may only be used if acceptable to Local Water
Undertaking
Filling a Sealed Water System (Method 2)
Cistern Filling Method
NOTE: Cistern to be supplied through a
temporary connection from a service pipe or
cold water distributing pipe
Vessel Charge Pressure (bar)
Initial System Pressure (bar)
Expansion Vessel Volume (litres)
0.5
1.0
V x 0.11
1.5
1.0
V x 0.087
Table 1
Fig. 7
Fig. 8

5.0 Site Requirements
15
5.1 Builders Opening (Fig. 9)
1. The boiler unit is designed to fit within a standard
builders opening, the minimum dimensions of which are
as shown.
Height 570mm
Width 584mm
Depth 305mm
2. The opening should be soundly constructed of brick,
pre-cast concrete or be a proprietary builders opening.
3. The base of the opening should be sound and non-
combustible and must be flat and level.
4. The base of the builders opening should be at the
same height as the finished level of the hearth.
IMPORTANT: If a false chimney breast is intended
to house the boiler, a simulated builders opening,
within the breast, must be provided.
5. The builders opening must not communicate with
voids, pipe ducts or spaces other than the room in
which the appliance is situated.
5.2 Location
1. The appliance must be installed in the living space of a
dwelling. It is recommended that it is a ground floor
location.
2. Restrictions to the siting of the appliance are covered
by BS 5546. The appliance may not be installed in
bathrooms or shower rooms. bedrooms or bed sitting
rooms.
5.3 Fireplace Opening & Surround
1. If a fireplace surround is to be used, it must be
centrally placed and have opening sizes as shown in
Fig. 9.
5.4 Firefont Frame Extension Kit
1. To accommodate the firefront there must be at least
95mm from the surround or finished face to the front of
the boiler.
2. If necessary this can be increased by the use of Frame
Extension Kits. Each extension increases the effective
depth of the opening by 50mm.
3. See the instructions supplied with the firefront for full
details.
© Baxi Heating UK Ltd 2009
560mm min
SURROUND OR FINISHED
WALL FACE
560mm minimum 590mm maximum
570mm minimum
305mm minimum
Solid, non combustible hearth
to support the boiler,
as specified in BS 5871.
HEARTH
LEVEL
Fireplace
Opening
390mm min
490mm max
584mm min
595mm max
5570mm min
Fig. 9
Builders
Opening
(575mm max Valour Dimension
Regalia ONLY )

5.0 Site Requirements
16 © Baxi Heating UK Ltd 2009
5.5 Flue
1. The following guidelines indicate the general
requirements for installation of flues.
For GB recommendations are given in BS 5440 Part 1.
For IE recommendations are given in the current edition
of I.S. 813 “Domestic Gas Installations”.
2. Only one of the two available MULTIIFIT vertical
concentric Flexi Flue kits approved for use with the
boiler can be used (10m kit 720101701 or 12.5m kit
720102001). Any proprietary flue systems, terminals,
adaptors etc. MUST NOT BE USED.
3. The available flue kits are intended for installation
within an existing chimney. This should be clean and
sound, and any other previously installed flue
components (liners, dampers etc.) removed.
4. The flue must have a minimum vertical height of 3m
and have no bends greater than 45°.
NO HORIZONTAL RUNS ARE PERMITTED !
5. The terminal must be sited so that free passage of air
across it can occur at all times.
6. It must also be a MINIMUM of 150mm from any
other terminals or obstructions (A). When adjacent to
windows or openings on pitched or flat roofs it must be
at least 600mm away (B). A minimum dimension of
2000mm must be maintained when below windows or
openings in pitched roofs (C) (Fig. 10).
B
C
A
Fig. 10

5.0 Site Requirements
17
© Baxi Heating UK Ltd 2009
5.6 Ventilation
1. No ventilation is required for the boiler in the room of
installation.
5.7 Gas Supply (Fig. 11)
1. The gas installation should be in accordance with
relevant standards. In GB this is BS 6891. In IE this is I.S.
813 “Domestic Gas Installations”. The connection at the
appliance is 15mm copper tail located at the rear of the
gas tap.
2. Ensure the pipework from the meter to the appliance is
of adequate size. It is necessary to route the gas supply
pipe to the right hand side of the builders opening. It must
be routed so as not to restrict the installation and
servicing of the appliance.
5.8 Electrical Supply (Fig. 11)
1. External wiring must be correctly earthed, polarised and
in accordance with relevant regulations/rules. In GB this is
the current I.E.E. Wiring Regulations. In IE reference
should be made to the current edition of the ETCI rules.
The mains supply is 230V ~ 50Hz fused at 3A.
NOTE: The method of connection to the electrical supply
must facilitate complete electrical isolation of the
appliance. Connection may be made via a fused double
pole isolator with a contact separation of at least 3mm on
all poles and serve the boiler and system controls only.
The boiler MUST NOT be connected to the same supply
as the firefront as their fuse ratings are different and
subsequent damage may occur.
2. The boiler supply cable within the builders opening
should be 0.75mm2to IEC 53 code 227 (heat resistant).
3. It is preferable to route the electrical supply cable to
the right hand side of the builders opening. If however it
must come from the left hand side it must be routed so
as not to restrict the servicing of the appliance.
4. The cable must be routed to avoid contact with any
part of the boiler.
Fig. 11
Gas Connection
Electrical Connection

5.0 Site Requirements
18 © Baxi Heating UK Ltd 2009
5.9 Condensate Drain - General
Failure to install the condensate discharge pipework
correctly will affect the reliable operation of the boiler.
1. Ensure the discharge of condensate complies with any
national or local regulations in force.
BS 6798 & Part H1 of the Building Regulations give further
guidance.
2. If any further drain pipe is required (additional to that supplied
with the boiler), it should be run in a proprietary material
e.g. PVC, PVC-U, ABS, PVC-C or PP. John Guest ‘Speedfit’
components are recommended.
3. Metal pipework is NOT suitable for use in condensate
discharge systems.
4. Any pipe fitted externally must be kept as short as possible to
minimise the potential of freezing and must be insulated using
waterproof material.
5. When discharging condensate into a soil stack or waste pipe
the effects of existing plumbing must be considered.
5.10 Condensate Disposal (Fig. 12)
1. This boiler incorporates an automatic pumped condensate
system. The pump is submerged in a sump assembly and is
activated by the discharge float switch. A second (safety) float
switch is fitted.
2. The pump has an effective head of 3.5 metres. The
condensate outlet is positioned at the top right front of the
boiler. It is 10mm diameter plastic.
3. 3.5 metres of flexible 10mm condensate discharge pipe and a
10mm push fit elbow are supplied with the boiler.
4. The 10mm pipe can be routed to a maximum of 3.5 metres
vertically and then discharge via gravity or be routed
horizontally. A combination of vertical and horizontal runs is
permissible.
5. The pipe must be adequately supported, either using suitably
spaced clips or run within larger diameter pipe. When using clips
take care not to deform the pipe.
6. When routing the pipe through a wall it must be suitably
sleeved. Also the pipe must not be exposed to sources of heat,
and should be protected in locations where it may be damaged.
7. The pipe should be routed so that any sharp bends, dips and
loops are avoided. A minimum radius of 100mm is
recommended for any bends. No slope is necessary and air
breaks are not required on the pumped part of the condensate
run.
8. Any part of the condensate drain system that is outside the
dwelling, or in an unheated part of it must be at least 21.5mm
diameter.
Boiler
Max. Head
3.5 metres
Gravity Drain
min. fall 3°
Min. radius 100mm
Note: The point of discharge from the
pumped length of condensate pipe
(point ‘A’) must be 150mm above the
base level of the boiler, whether
discharging direct into a drain or into
an additional gravity drain.
Point ‘A’
Fig. 12

19
© Baxi Heating UK Ltd 2009
5.0 Site Requirements
5.10 Condensate Disposal (cont.)
9. Ensure that the condensate can discharge freely (without
blockage or restriction of the pipe) into the drain.
10. Examples are shown of condensate pipe methods of
termination:-
i) via an internal discharge branch
(e.g. sink waste) - Fig. 13.
ii) to an internal or external soil and vent pipe -
Fig. 14.
iii) to a drain or gully - Fig. 15. Ensure that the
condensate can discharge freely (without
blockage or restriction of the pipe) into the
drain.
iv) to a soakaway - Fig. 16.
5.11 Condensate Pump Operation
1. The pump operates for 2 seconds when mains voltage is
applied to the boiler, e.g. when the power has been
interrupted and then reinstated.
2. If the boiler reset rocker switch has been operated the
pump will run also for 2 seconds.
3. When the level of condensate in the sump is sufficient to
activate the discharge float switch the pump will run for 7
seconds, during which time about 0.6 litres of condensate will
be discharged.
4. In the event of condensate not being discharged the safety
float switch will operate when the volume of condensate in
the sump reaches 1.05 litres. Once the safety float switch has
been activated the boiler will lockout.
5. The total volume of the sump is 1.5 litres.
From Boiler
Termination to an internal soil and vent pipe
Termination via internal discharge branch e.g
sink waste - downstream
Sink
Pipe must terminate
above water level but
below surrounding surface
Pipe must terminate above
water level but below
surrounding surface
Termination to a drain or gully
Termination to a purpose made
soak-away
Holes in the soak-away must
face away from the building
Fig. 13
Fig. 14
Fig. 15
Fig. 16
Direct Connect Fitting
Direct Connect Fitting
From Boiler
From Boiler
From Boiler
Min. 450mm
500mm Min.

20 © Baxi Heating UK Ltd 2009
6.0 Boiler Internal Wiring
6.1 Boiler Internal Illustrated Wiring Diagram
- brown
- black
- blue
- white
- yellow
br
bk
b
w
y
- green
- green / yellow
- red
g
g/y
r
Control PCB
X2 X3
X9
X501
1212 3
344 5
56789
X1
12
Central Heating
NTC Flow Sensor
Fan
Gas Valve
Overheat Thermostat
Condensate Pump
X400 X401
bk
bk
gr
gr
b
b
br
bk g
b
br
g/y
bbr
br
b
bk
b
br
bk
bk
bk
b
br
by
b
Spark
Generator
Ignition
Electrode
987654321 910 8 7 6 54321
1234
r
r
1
4
2
5
3
1
2
a
b
bk
bk
- greygr
gr gr
Safety Float
Switch
Discharge Float
Switch
ON/OFF
Reset
Mains Input
(Permanent Live to 3,
Switched Live to 1)
r
bk
bk
bk bk
r
br
br
y
b
1
N
2
3
br
1
N
2
3
y
X300
X900
X500
b
b
b