Potterton Performa 9 SL HE User manual

© Baxi Heating UK Ltd 2008
Installation & Service Instructions
Only a flue approved for the Performa SL HE can be used.
These instructions include the Benchmark Commissioning Checklist
and should be left with the user for safe keeping.
Performa SL
HE Range
Condensing
Central Heating
Boiler
You can rely on
Supplied
by
themanualslibrary.co.uk
themanualslibrary.co.uk
themanualslibrary.co.uk

© Baxi Heating UK Ltd 2008
2
Contents
1. Introduction.....................................................4
2. Technical Data.................................................6
3. Installation Requirements..............................8
3.1 General Information........................................8
3.2 Legislation, Standards & Codes of Practice....8
3.3 Gas Supply......................................................8
3.4 Electricity Supply.............................................9
3.5 Location of Boiler............................................9
3.6 Condensate Disposal....................................10
3.7 Air Supply......................................................11
3.8 Flue Systems...........................................11
3.9 Plume Displacement....................................18
3.10 Water Circulating Systems...........................22
4. Installation.....................................................26
4.1 Unpack, Prepare the Wall & Boiler................26
4.2 Install the Flue...............................................27
4.3 Electrical Connections..................................28
4.4 Connect the Gas Supply...............................29
4.5 Connect the Water System...........................29
4.6 Connect the Condensate Drain.....................29
5. Wiring Diagrams............................................30
6. Commissioning.............................................32
6.1 Commission the Systems.............................32
6.2 Commission the Boiler..................................32
6.3 Flush the System..........................................32
6.4 Final Adjustments.........................................33
6.5 Advise the User.............................................33
6.6 Documentation.............................................33
7. Control Sequence.........................................34
8. Fault Finding Guides.....................................35
9. Servicing & Parts Replacement...................42
9.1 Servicing Procedure.....................................42
9.2 General Access............................................44
9.3 PCB Enclosure.............................................44
9.4 Gas Valve......................................................44
9.5 Air Pressure Switch.......................................45
9.6 Spark Igniter..................................................45
9.7 Flow/Casting Sensors...................................45
9.8 Overheat Sensor...........................................45
9.9 Fan & Flue Hood...........................................46
9.10 Electrodes/Burner.........................................47
9.11 Injector..........................................................47
9.12 Combustion Chamber Insulation...................48
9.13 Condensate Trap...........................................49
9.14 Primary Heat Exchanger...............................50
9.15 Secondary Heat Exchanger..........................51
10. Short Spares List......................................52
Benchmark Commissioning Checklist ............54
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.
CORGI operate 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.
Potterton 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.

© Baxi Heating UK Ltd 2008 3
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
CORGI will record the data and
will send a certificate of
compliance to the property
You must ensure that the
notification number issued by
CORGIis written onto the
Benchmark Checklist
Scheme Members only
Call CORGI on: 0870 88 88 777
or log onto:
www.corgi-notify.com
within 10 days
If you notify via CORGI Scheme,
CORGI will then notify the
relevant Local Authority
Building Control Scheme
on member's 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
Installer Notification Guidelines

© Baxi Heating UK Ltd 2008
4
1. Introduction
Potterton Performa HE
Performa 9 SL HE G.C. No. 41 592 05
Performa 12 SL HE G.C. No. 41 592 06
Performa 15 SL HE G.C. No. 41 592 07
Performa 18 SL HE G.C. No. 41 592 08
Performa 21 SL HE G.C. No. 41 592 09
Performa 24 SL HE G.C. No. 41 592 10
Performa SL HE boilers are fully automatically
controlled, wall mounted, fan powered, balanced flue
condensing boilers using a cast iron primary heat
exchanger.
Performa SL HE boilers meet the requirements of
Statutory Instrument “The Boiler (Efficiency)
Regulations 1993 No 3083” and 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 Body 0086.
For use with Natural Gas (G20) only at 20mbar and for
use in GB/IE only.
CORGI
All CORGI registered installers carry a CORGI
identification card and have a registration number. You
can check your installer is registered by:-
• Telephoning 0870 401 2300
• Writing to 1 Elmwood, Chineham Business Park,
Crockford Lane, Basingstoke, RG24 8WG.
• Check online at www.corgi-gas-safety.com
Identification
To gain access to the identification labels, pull the door
down.
The data label is on a swing out plate located just
above the operating lights and temperature control
knob.
A seven digit version of the serial number is located on
the operating label attached to the rear of the door.
Important Installation Notes
The boiler is suitable for use with fully pumped
open vented and sealed systems with an indirect
coil type high efficiency cylinder.
The gas type, supply size and pressure must be
checked for suitability before connection.
Failure to install the condensate discharge
pipework correctly could affect the reliable
operation of the boiler.
For the boiler to operate correctly all air must be
vented from the system prior to commissioning
and the system itself must be suitably vented.
The system must be designed to always provide
a route for water to circulate between the boiler
flow and return.
For optimum boiler performance, pump
performance must meet the requirements shown
on Page 23.
Failure to flush and add inhibitor to the system
may invalidate the boiler warranty.
Failure to commission the boiler correctly may
result in the installer being charged for any visits
made by Potterton.
© Baxi Heating UK Ltd 2008 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.

© Baxi Heating UK Ltd 2008 5
Health and Safety Information for the Installer and
Service Engineer
Under the Consumer Protection Act 1987 and Section
6 of the Health and Safety at Work Act 1974, we are
required to provide information on substances
hazardous to health.
Small quantities of adhesives and sealants used in the
product are cured and present no known hazards. The
following substances are also present.
Man-Made Mineral Fibre
a) Some component parts of this boiler (insulation
pads, gaskets and rope seals) are manufactured
from man-made mineral fibre.
b) Prolonged or excessive exposure to this material
may result in some irritation to the eyes, skin or
respiratory tract.
c) It is advisable to wear gloves when handling these
items.
d) Irritant dust will only be released from the items if
they are broken up or subjected to severe
abrasion. In these instances a suitable dust mask
and goggles should be worn.
e) Always thoroughly wash hands after installation,
servicing or changing components.
f) When disposing of any items manufactured from
man-made mineral fibre care must be exercised.
g) If any irritation of the eyes or severe irritation of
the skin is experienced seek medical attention.

© Baxi Heating UK Ltd 2008
6
Model Seasonal Efficiency
(SEDBUK) (%)
9 SL 86.1
12 SL 86.4
15 SL 86.2
18 SL 86.2
21 SL 86.2
24 SL 86.2
Models 9 SL 12 SL 15 SL 18 SL 21 SL 24 SL
Heat Input - Gross kW 10.22 13.62 17.04 20.43 23.84 27.25
Btu/h 34,877 46,465 58,129 69,717 81,343 92,968
Heat Output (Non Condensing) kW 8.82 11.78 14.76 17.72 20.68 23.63
Btu/h 30,093 40,181 50,350 60,466 70,553 80,641
Heat Output (Condensing) kW 9.50 12.64 15.66 18.83 21.89 24.94
Btu/h 32,430 43,111 53,431 64,232 74,703 85,105
Gas Rate m3/h 0.98 1.30 1.63 1.95 2.28 2.60
ft3/h 34.5 45.9 57.5 68.9 80.4 91.9
Burner Pressure - Hot mbar 8.6 10.4 9.0 8.4 11.4 12.8
in wg 3.44 4.16 3.6 3.36 4.56 5.12
Gas Supply Pressure mbar 20 20 20 20 20 20
Injector Size mm 2.8 3.1 3.5 3.9 3.9 4.1
Water Content litres 2.3 - 9, 12 & 15 2.7 - 18, 21 & 24
Boiler Weight kg 39.0 - 9, 12 & 15 42.8 - 18, 21 & 24
(Lift/Installed - Dry)
Nox Class 2 2 2 2 2 2
Maximum Working Head 30.5m (100 ft)
Minimum Working Head 150mm (6 in)
Flow Temperature Range 63°C - 82°C
Gas Supply Connection 15 mm Tail
Flow/Return Connections 22 mm Copper
Condensate System Connection 21.5 mm PP
Electricity Supply 230v ~ 50Hz
External Fuse 3A
Internal Fuse Type 3.15AT
Power Consumption 80 Watts (excluding pump)
Electrical Protection IP20
Boiler Type C12, C32, C52
Boiler Category CAT 1 2H2H - G20 - 20 mbar
2. Technical Data
SEDBUK Declaration for
Performa SL HE
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 have been
certified by 0087.

© Baxi Heating UK Ltd 2008 7
595 mm
400 mm
5 mm
clearance
125 mm
clearance
130 mm servicing clearance
50 mm installation clearance*
5 mm
clearance
410 mm overall
clearance
850 mm
770 mm*
overall
clearance
Fan and Flue Hood
Air Pressure Switch
Secondary
Heat Exchanger
Condensate Trap
75 mm
Gas Valve
Primary
Heat Exchanger
PCB Enclosure
Burner & Electrodes
Flow Connection Return Connection
Spark Igniter
Flow Sensor
Overheat Sensor
Casting Sensor
610 mm
servicing
clearance
260 mm
15 mm
clearance
Condensate Connection
Wiring Centre
Data Label
'O' Ring and
Clip Joints
Gas Connection
Fig. 1

© Baxi Heating UK Ltd 2008
8
3.3 Gas Supply
The meter and supply pipes must be capable of delivering
the required quantity of gas in addition to the demand from
any other appliances in the house and must be governed
at the meter.
The pipe diameter required will depend on the boiler
model and the pipe length from the gas meter.
The gas installation should be in accordance with
BS6891.
3. Installation Requirements
3.1 General Information
Optional Extras
Various flue extensions, bends, vertical flue kits, control
accessories etc. are available as optional extras. These
are detailed in a separate publication.
Lifting
Important - This product should be lifted and handled by
two people. Stooping should be avoided, and protective
equipment worn when necessary. Carrying and lifting
equipment should be used as required, for example
when installing in a loft space.
3.2 Legislation, Standards & Codes of Practice
The boiler is suitable only for installation in GB and IE
and must be installed in accordance with the
manufacturer’s instructions and the rules in force,
and only used in a suitably ventilated location.
Any purpose provided ventilation should be checked
periodically to ensure that it is free from obstruction.
Installation, Commissioning, Service & Repair
In GB, the installation must be carried out by a
Competent Person. It must be carried out in
accordance with the relevant requirements and current
edition of:
The GAS SAFETY (Installation and 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 I.E.E. WIRING REGULATIONS.
Where no specific instructions are given, reference
should be made to the relevant BRITISH STANDARD
CODES OF PRACTICE.
Reference should also be made to BRITISH GAS
GUIDANCE NOTES FOR THE INSTALLATION OFDOMESTIC
GAS CONDENSING BOILERS.
Definition of competence: A person who works for a
CORGI registered company and holding current
certificates in the relevant ACS modules is deemed
competent.
Important – Failure to install and commission this boiler
to manufacturer’s instructions may invalidate the
warranty. This does not affect your statutory rights.
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.
Reference should also be made to the ETCI rules for
electrical installation.
STANDARD
B.S. 6891
B.S. 5440: Pt 1
B.S. 5440: Pt 2
B.S. 5546
B.S. 7074
B.S. 5449
B.S. 6798
B.S. 7593
B.S. 7671
SCOPE
Gas Installation.
Flues.
Air Supply.
Installation of hot water supplies
for domestic purposes.
Expansion vessels and ancillary
equipment for sealed water systems.
Forced circulation hot water systems.
Installation of gas fired hot water
boilers.
Treatment of water in domestic hot
water central heating systems.
IEE Wiring Regulations
STANDARD
I.S. 813
B.S. 5546
B.S. 7074
B.S. 5449
B.S. 7593
SCOPE
Domestic Gas Installations.
Installation of hot water supplies
for domestic purposes.
Expansion vessels and ancillary
equipment for sealed water systems.
Forced circulation hot water systems.
Treatment of water in domestic hot
water central heating systems.
In IE:
The following BS standards give valuable additional information
In GB the following Codes of Practice apply:

© Baxi Heating UK Ltd 2008 9
3.4 Electricity Supply
230V ~ 50Hz via a fused double pole switch with
a contact separation of at least 3 mm in both
poles.
There must be only one common isolator for the
boiler and its control system, it must provide
complete electrical isolation and be fitted
adjacent to the boiler.
There is no method of isolating the boiler at the
user interface.
The power cable to the boiler must be 4-core to
supply permanent live, neutral, earth and
switched live.
Electrical installation should be in accordance
with BS7671.
WARNING: THIS BOILER MUST BE EARTHED AND
CORRECTLY POLARISED.
3.5 Location of Boiler
The boiler must be mounted on a flat wall which
is sufficiently robust to take the weight of the
boiler.
Location
The boiler should be fitted within the building
unless otherwise protected by a suitable
enclosure.
Clearances
The boiler requires only the clearances shown
on Page 7, after installation.
Combustible Wall
The boiler is suitable for installation to a
combustible wall e.g. wood cladding, provided
that the flue duct is not closer than 25 mm to
combustible material. A metal sleeve should be
installed to surround the flue duct to provide a
25 mm annular space. Further guidance is
given in BS5440: Pt 1.
Timber Frame
If the boiler is to be fitted into a building of
timber frame construction then reference must
be made to the current edition of Institution of
Gas Engineers Publication IGE/UP/7/ (Gas
Installation in Timber Framed Housing).
Zone 2
Zone 1
Zone 0
Zone 2
Zone 3
Zone 3
Zone 2
Window
Recess
Window
Recess
0.6 m 2.4 m
In GB Only
Ceiling
Outside
Zones
Outside Zones
Zone 3
Zone 3
Zone 2
Zone 2
Zone 1
Zone 0
2.25 m
Zone 2
Window
Recess
3.0 m
2.4 m
0.6 m
In GB Only
Bath or Shower Room
If the boiler is fitted in a room containing a bath or shower, it
can only be fitted in Zone 3, Figs. 2 & 3 show Zone
dimensions for a bathtub. For other examples refer to
BS7671.
Cupboard or Compartment
A cupboard or compartment used to enclose the boiler must
be designed and constructed specifically for this purpose. An
existing cupboard or compartment may be used provided that
it is modified for the purpose. Details of essential features of
cupboard/compartment design including airing cupboard
installations are given in BS6798 and BS5546.
Service Access
Pipes and wiring must not restrict service access to
the boiler
Fig. 2
Fig. 3

© Baxi Heating UK Ltd 2008
10
3.6 Condensate Disposal
This boiler incorporates a 75 mm trap.
Ensure the disposal of condensate complies with
any national or local regulations in force.
Failure to install the condensate disposal pipework
correctly will affect the reliable operation of the
boiler.
The pipe must always slope continually downward
away from the boiler by at least 50 mm in every
metre (approx. 2.5°). No air breaks are required in
the pipe.
1. The pipe should be run in a proprietary drain pipe
material e.g. PVC, PVC-U, ABS, PVC-C or PP. Metal
pipework is NOT suitable for use in condensate
disposal systems.
2. The pipe should be a minimum of 21.5 mm diameter
and must be supported using suitably spaced clips
to prevent sagging.
3. To reduce the risk of condensate being trapped, as
few bends and fittings as possible should be used.
4. When disposing condensate into a soil stack or
waste pipe the effects of existing plumbing must be
considered. If soil pipes or waste pipes are subjected
to internal pressure fluctuations when WC's are
flushed or sinks emptied then back-pressure may
force water out of the boiler trap and could affect the
operation of the boiler.
5. Any condensate pipework external to the building (or
in an unheated part of it e.g. garage) should not
exceed 3 metres in length and when in an exposed
position, waterproof insulation is recommended. It is
also recommended that the pipe diameter is
increased to 32 mm.
If the boiler is fitted in an unheated location the entire
condensate pipe should be treated as an external
run.
Examples are shown of the following methods of
termination in order of preference:-
i) via an internal discharge branch
(e.g. sink waste) - Fig. 4.
ii) to an internal soil & vent pipe - Fig. 5.
iii) to a drain or gully - Fig. 6.
iv) to a purpose made soakaway - Fig. 7.
BS 6798 & Part H1 of the Building Regulations
give further guidance.
Boiler
50 mm per metre (2.5°)
Minimum fall
Termination to an internal soil
and vent pipe
450mm min
Boiler
Termination via internal discharge
branch e.g sink waste - downstream
Sink
Pipe must terminate
above water level but
below surrounding
surface
Boiler
Pipe must terminate
above water level but
below surrounding
surface
Termination to a drain or
gully
Boiler
500mm min
Termination to a purpose made
soak-away
Holes in the soak-away
must face away from the
building
Fig. 4
Fig. 5
Fig. 6
Fig. 7

© Baxi Heating UK Ltd 2008 11
3.7 Air Supply
The room in which the boiler is installed does not require
a purpose provided air vent.
3.7.1 Ventilated Cupboard/Compartment
If the boiler is installed in a cupboard or compartment
(with the exception of those installations covered by
Section 3.7.2), permanent air vents are required in
the cupboard or compartment, one at high level and
one at low level, either direct to the outside air or to a
room. Both high level and low level air vents must
communicate with the same room or must be on the
same wall to outside air. Both the high level and low
level vent to a room must each have a free area as
stated below. The free area of each vent may be
halved if the ventilation is provided directly from
outside.
Models: 9 SL: 92 cm218 SL: 184 cm2
12 SL: 123 cm221 SL: 215 cm2
15 SL: 154 cm224 SL: 246 cm2
The minimum size of ventilated compartment is
850 mm high by 410 mm wide. If the cupboard or
compartment has a door the depth must be a
minimum of 275 mm. This will allow for a minimum of
15 mm clearance between the front of the boiler and
the door for air movement.
3.7.2 Unventilated Compartment
The 9, 12 and 15 models can be installed in an
unventilated compartment providing the following
conditions are met and no other heat sources are
present within the compartment:
1. Minimum sizes for alternative compartments that
include the required clearances are shown in Table 1.
2. Maximum Horizontal flue length from turret for
boiler in unventilated compartment is 560 mm.
Ventilation should be in accordance with BS 5440: Pt 2.
3.8 Flue Systems
Horizontal
The standard flue/terminal assembly can be cut and
is suitable for an installed length from 160 mm up to
700 mm.
1 m flue extensions are available. Maximum straight
flue length 3.55 m (3 extensions) (equivalent
resistance = 3.55 m). It is recommended that the flue
is supported at least once per metre.
All lengths quoted exclude the boiler elbow.
Example layouts are shown on the Page 13.
Bends
A 93° bend is equivalent to a 1m length of flue.
A 135° bend is equivalent to a 0.5m length of flue.
Vertical
For information on vertical flues consult the
instructions supplied with the vertical flue kits.
3.8.1 Flue Terminal Location
The following guidelines indicate the general
requirements for siting balanced flue terminals.
• With a condensing boiler a plume of water vapour
will be discharged from the flue. This should be taken
into account when siting the flue and the effect it
could have on neighbouring property and occupants.
• If a terminal is less than 2 metres above a balcony,
above ground, or above a flat roof to which people
have access a suitable terminal guard must be fitted
centrally about the terminal.
• If the terminal discharges onto a pathway or
passageway, check that the combustion products will
not cause a nuisance and that the terminal will not
obstruct the passageway.
• For fitting under low soffits, eaves and to extend
beyond guttering it is acceptable for the flue to
project up to 500 mm from the face of the wall to the
inside of the air intake. This can be painted if
required using a suitable external paint.
The terminal location should be in accordance with,
in GB, BS 5440 Pt. 1. and IE, I.S. 813 "Domestic Gas
Installations".
Unventilated Compartments
Example 1 Example 2
Height 1295 mm Height 990 mm
Width 550 mm Width 750 mm
Depth 540 mm Depth 750 mm
Minimum clearances within compartment
Top 450 mm Top 265 mm
Bottom 250 mm Bottom 130 mm
Side 75 mm Side 175 mm
Front 280 mm Front 490 mm
Table 1

© Baxi Heating UK Ltd 2008
12
IMPORTANT:
• Only ONE 25mm clearance is allowed per installation.
• Under car ports we recommend the use of the plume
displacement kit.
• The terminal position must ensure the safe and
nuisance - free dispersal of combustion products.
N
I
I
G
F
M
I
AAF
H
J,K
D
E
H
Likely flue positions requiring
a flue terminal guard
C
RA
I
J,K
I
L
S
B
T
U
Fig. 8
Fig. 9
300 min
Terminal
Assembly
Top View Rear Flue
Property Boundary Line
NOTE: The distance from a fanned draught appliance
terminal installed parallel to a boundary may not be less
than 300mm in accordance with the diagram below
Terminal Position with Minimum Distance (Fig. 8) (mm)
AaDirectly below an opening, air brick, opening windows, etc 300
BaAbove an opening, air brick, opening window etc. 300
CaHorizontally to an opening, air brick, opening window etc. 300
D Below gutters, soil pipes or drain pipes. 25
E Below eaves. 25
F Below balconies or car port roof. 25
G From a vertical drain pipe or soil pipe. 25
H From an internal or external corner. 25
I Above ground, roof or balcony level. 300
J From a surface or boundary line facing a terminal. 600
K From a terminal facing a terminal (Horizontal flue). 1200
From a terminal facing a terminal (Vertical flue). 600
L From an opening in carport (e.g. door, window)
into the dwelling. 1200
M Vertically from a terminal on the same wall. 1500
N Horizontally from a terminal on the same wall. 300
R From adjacent wall to flue (vertical only). 300
S From an adjacent opening window (vertical only). 1000
T Adjacent to windows or openings on pitched and flat roofs 600
U Below windows or openings on pitched roofs 2000
aIn addition, the terminal should be no nearer than 150 mm to an
opening in the building fabric formed for the purpose of accommodating
a built-in element such as a window frame. See BS 5440 Pt. 1.
*
Opening
Window or Door
100mm
MIN.
IMPORTANT: If fitting a Plume Displacement Flue Kit,
the air inlet must be a minimum of 100mm from any
opening windows or doors (see Plume Displacement
Section 3.9).
Plume
Displacement
Kit
Air Inlet
Fig. 10

© Baxi Heating UK Ltd 2008 13
3.8.2 Horizontal Flue Systems
1. The standard flue is suitable only for horizontal
applications.
2. Maximum permissible equivalent flue lengths is:-
Horizontal Concentric 3.55m
3. Any additional “in line” bends in the flue system must
be taken into consideration. Their equivalent lengths
are:-
Concentric Pipes:
135° bend 0.5 metres
93° bend 1.0 metres
Twin Flue Pipe
135° bend 0.25 metres
91.5° bend 0.50 metres
The elbow supplied with the standard horizontal flue is
not included in any equivalent length calculations.
NOTE: Flue length is measured from point X to Y
as shown.
Horizontal
Flues
Y
X
Plume Displacement Kit
60 /100 Ø
1M Extensions, 45° & 93°
elbows are also available - see
Plume Displacement
Section 3.9
NOTE: Horizontal flue pipes should always be installed with at least a
1.5° fall from the terminal to allow condensate to run back to the boiler.
Y
X
This bend is
equivalent to 1 metre
Total equivalent length =
A+B+C+2x90°Bends
B
AC
This bend is
equivalent to 1 metre

© Baxi Heating UK Ltd 2008
14
Vertical
Flues
(Twin Pipe)
Y
X
Vertical
Flues
Y
X
The total equivalent length for this
example is = 5.5 metres.
1m extension
135°bend
91.5°bend
1m
0.25m
0.5m
4
2
2
4.0m
0.5m
1.0m
AIR DUCT
Noof
fittings/pipes
Sub total
Equivalent
Length Value
Equivalent Length Air Duct = 5.5m
1m extension
135°bend
91.5°bend
1m
0.25m
0.5m
4
2
2
4.0m
0.5m
1.0m
FLUE DUCT
Noof
fittings/pipes
Sub total
Equivalent
Length Value
Equivalent Length Flue Duct = 5.5m
Y
X
C
Roof
Terminal
A
B
This bend is
equivalent to 1 metre
Total Equivalent Length =
A+B+C+1x90°Bend
All vertical and angled runs must be included,
measured from the boiler adaptor (point X) to
the joint with the flue terminal (point Y). One
91.5° bend or two 135° bends can be
included without reduction of the flue length.
If further elbows are required the flue
length must be reduced by the following
amounts:-
1 metre for each 91.5° bend
0.5 metre for each 135° bend
3.8.3 Twin & Vertical Flue Systems
1. Maximum permissible equivalent flue lengths are:-
Vertical Concentric 1.9m
Vertical Twin Pipe 6m*
* Both the air and flue duct can be up to 6 metres
long each.
2. Any additional “in line” bends in the flue system must
be taken into consideration. Their equivalent lengths
are:-
Concentric Pipes:
135° bend 0.5 metres
93° bend 1.0 metres
Twin Flue Pipe
135° bend 0.25 metres
91.5° bend 0.50 metres
The elbow supplied with the standard horizontal flue is
not included in any equivalent length calculations
NOTE: Flue length is measured from point X to Y
as shown.
Y
X

© Baxi Heating UK Ltd 2008 15
Key Accessory Size Baxi Code
No
FLUE GROUP A
Concentric Flue System 100mm diameter
A3 Telescopic Internal Flue Kit 315-500mm 5119654
A2 Telescopic Flue (incl elbow) 5118069
A Horizontal flue Terminal (incl elbow) 5118489
B Flue extension 1000mm 5111074
C Flue Bend 93° 5111075
D Flue Bend (pair) 135° 5111085
U Pipe support (painted) 100mm 5111080
R Vertical flue adaptor (use with 5111078) 5111070
T Vertical flue boiler adaptor 5111065
P Wall Liner 5111067
S Flue Terminal Deflector 5111068
FLUE GROUP N
Twin Flue System 80mm diameter
E Flue extension (pair) 1000mm 5111087
F Flue Bend (pair) 90° 5111072
G Flue Bend (2 pair) 135° 5111086
O Vertical flue boiler adaptor kit 5111071
H Vertical flue adaptor 5111084
W Pipe support (pair) 80mm 5111081
FLUE GROUP A, N,
Vertical Flue Kits
K Vertical flue terminal (use with 5111070) 5111078
L Lead tile 25°/45° 246141
Lead tile 35°/55° 246142
M Roof cover plate 246143
N Flat roof flashing 246144
A
B
K
R
D
C
N
U,W
S
L
H
M
E
GF
P
3.8.4 Flue Accessories
A2
A3
O
T

© Baxi Heating UK Ltd 2008
16
For Twin Flue Systems fit the adaptors as follows:-
3.8.5 Vertical Flue Duct Adaptor (Fig. 11)
1. Remove the flue elbow from top of the boiler and
replace with the vertical flue duct adaptor ensuring the
existing gasket is still in place.
3.8.6 Twin Vertical Flue Boiler Adaptor (Fig. 12)
1. Remove the flue elbow from top of the boiler and
replace with the twin vertical flue duct adaptor ensuring
the existing gasket is still in place.
2. Attach the rubber spacer to the base of the adaptor.
3. Fit the adaptor to the top of the boiler and secure it to
the four hole fixing plate using the long screws supplied.
4. Continue to fit the twin flue system.
Vertical Flue
Boiler Adaptor
Gasket
Gasket
Original
seal
Four hole fixing plate
Screw
Stick
rubber
spacer
here
Position of Adaptor
Twin Vertical Flue
Boiler Adaptor
Fig. 11
Fig. 12

© Baxi Heating UK Ltd 2008 17
Fig. 13
Fig. 14
100mm 685mm
Push Fit
Adaptor
Air Duct
Flue Duct
Cut the same
amount off
the Air Duct
& Flue Duct
Approx
1425mm
3.8.7 For Roof Terminals
1. In the case of a pitched roof 25 - 50 degrees, position the
lead tile to replace/flash over existing roof tiling. Make an
aperture in the roof suitable for the lower tube of the roof
terminal and ensure the integrity of the roof cover is
maintained. The adjustable plastic collar can either be
positioned on the lead tile or the lower tube of the roof
terminal prior to the final positioning of the vertical flue through
the tile. Check the collar is correctly located to suit required
roof pitch (either 25° to 38° or 37° to 50°). From inside the roof
adjust the flue to a vertical position and secure to the roof
structure with the clamp supplied.
2. For flat roof installations the aluminium flashing must be
incorporated into the roof covering and the appropriate
aperture made in the roof decking. The vertical flue is lowered
onto the flashing making sure the collar of the flue locates
securely with the flashing. (A mastic seal may be necessary).
From inside the roof, adjust the flue to a vertical position and
secure to the roof structure with the clamp supplied.
3.8.8 Flue Dimensions
The standard horizontal flue kit allows for flue lengths between
100mm and 685mm from elbow to terminal (Fig. 13).
The maximum permissible equivalent flue length is: 3.55
metres
NOTE: Each additional 45° of flue bend will account for
an equivalent flue length of 0.5m.
eg. 45° = 0.5m, 90° = 2 x 45° = 1m etc.
3.8.9 Flue Trim
1. The rubber flue trim supplied may be fitted to either the
outside wall or on the inner wall of installation.
3.8.10 Terminal Guard (Fig. 14)
1. When codes of practice dictate the use of terminal guards,
they can be obtained from most Plumbers’ and Builders’
Merchants.
2. There must be a clearance of at least 50mm between any
part of the terminal and the guard.
3. When ordering a terminal guard, quote the appliance name
and model number.
4. The flue terminal guard should be positioned centrally over
the terminal and fixed as illustrated.
3.8.11 Flue Deflector (Fig. 13a)
1. If required a flue deflector is available from your Baxi
stockist.
2. Push the flue deflector over the terminal end and rotate to
the optimum angle for deflecting plume. Secure the deflector
to the terminal with screws provided.
Flue Deflector
Fig. 13a

© Baxi Heating UK Ltd 2008
18
3.9 Plume Displacement Kit (Fig. 14b)
Kit No 5118638
Content of kit
1 0.9m 60/100 Concentric Flue
1 1m 60 Dia Exhaust Flue Pipe
1 Adaptor
2 60 Dia Support Brackets
1 93° Elbow/Plume Outlet Assembly
1 Flexible Flue Trim
3 “O” Rings
1 ‘Jubilee Clip
1 Boiler Elbow
1. This kit is recommended for installations where the
condensate plume emitted from the flue may cause a
nuisance or affect the surroundings.
2. The terminal must be positioned outside the building with
the air inlet facing downward and outlet connection upwards.
3. The plume outlet must always be at least 45° to the wall,
with the ‘peak’ uppermost to prevent rain entry (Figs. 15 & 16),
and be at least 2 metres above ground level. It must be
secured as shown in Fig. 12a. The plume outlet must also be
at least 500mm from the air inlet in any direction (Fig. 16).
NOTE: The outlet must be positioned so that any
condensate plume is directed away from adjacent surfaces.
There must be a constant fall along the entire length of the
flue system from the outlet back to the boiler.
4. It is possible to reduce or increase (with the addition of
extensions) the length of either or both the 60/100 concentric
and 60Ø exhaust.
5. Standard concentric flue extension kits may be added
between the boiler elbow and the terminal assembly.
6. The minimum length of the concentric flue is 100mm when
measured from the edge of the flue elbow.
IMPORTANT: The maximum equivalent length of
concentric flue is:-
3.55 metres Performa (9,12,15,18 SL)
3.0 metres (Performa 21,24 SL)
Additional bends may be fitted in the concentric flue, but
the equivalent length must be reduced by 1 metre (93°
elbow) or 0.5 metres (45° elbow).
7. 60Ø 1 metre extensions (including support bracket), and
additional 93° & 45° elbows are available. Any additional 93° &
45° elbows must be accounted for when calculating flue
lengths.
NOTE: Permitted positions of the plume outlet relative to
doors, windows etc. are the same as for conventional
concentric flues as detailed in the main Installation &
Servicing Instructions and BS5440 Pt. 1. It is NOT
necessary to fit a terminal guard over the air inlet or the
plume outlet.
Air Inlet at Bottom
‘Peak’ Uppermost
Fig. 15
Fig. 16
500mm Min.
45°
45°
Outlet must be at
least 45° from
wall face
93° Elbow/Plume
Outlet Assembly
60Ø Exhaust
Flue Pipe
60Ø Support
Bracket
60Ø Support
Bracket
Flexible Flue
Trim
60/100Ø
Concentric Flue
Adaptor
O Ring
O Ring
O Ring
‘Jubilee’ Clip
0.9 metres
Fig. 14b
Fig. 14a
Elbow

© Baxi Heating UK Ltd 2008 19
Concentric 60/100 Flue
60Ø Exhaust
X
Y
Fig. 17
2
0
2
4
6
8
10
12
14
60 Ø Exhaust (metres)
Concentric 60/100 Flue (metres)
0
16
18
13
20
F
G
Fig. 18
2
0
2
4
6
8
10
12
14
60 Ø Exhaust (metres)
Concentric 60/100 Flue (metres)
0
16
18
13
20
F
G
2
0
2
4
6
8
10
12
14
60 Ø Exhaust (metres)
Concentric 60/100 Flue (metres)
0
16
18
13
20
F
G
Flue Length - Worked Example
Potterton Performa 24 SL HE
In Fig. 18 opposite an additional 93° elbow has been
included in the 60Ø exhaust. with 2 x 1metre
extensions which have been cut to 0.25metres and
fitted. The waste is discarded.
To calculate total length:-
2 x 0.25 metre Lengths = 0.5 metres
1 x 93° Elbow = 1 metre
Total 60Ø Exhaust = 1.5 metres
After consulting the table in Example 3 it can be
determined that the concentric flue could be up to
approximately 6.25 metres long.
Concentric Flue
Support
Bracket 93° Elbow
Extension
Additional Accessories
A - 93° Elbow 5117381
B - 45° Elbow (Pair) 5117382
C - 1 metre 60Ø Extension 5117380
3.9.1 Determining Permissible Lengths
In the graph the solid line diagonal represents the
relationship between the concentric flue assembly
(and any extensions) and the 60Ø exhaust (and
any extensions or additional bends).
Example 1 - Not Permissible
If, for instance, a concentric length of 2.5 metres was
required and the 60Ø exhaust needed to be 16
metres the graph shows that this combination would
NOT be permissible as the intersection point would be
above the solid diagonal line.
Example 2 - Flue Lengths OK
Where both lengths have been determined they can
be applied to the graph to check that the installation is
permissible. For example, if it was known that 1 metre
of concentric flue and 6 metres of 60Ø exhaust were
required, the values could be applied to the graph as
shown in Example 2. As the point of intersection of
the dotted lines is below the solid diagonal line, the
combination of lengths is shown to be acceptable.
Example 3 - Flue Lengths OK
In the example shown, assume that the concentric
part of the flue needs to be 2 metres long. Find the
position of ‘2’ on the horizontal axis of the graph and
then project upwards to the solid diagonal line. This is
represented by the vertical thick dotted line. Where
this dotted line intersects with the solid diagonal line
on the graph, project across to the vertical axis. As
can be seen this corresponds with 5.5 metres.
Therefore, the total equivalent length of the 60Ø
exhaust can be up to 5.5 metres. Any elbow
equivalences must be accounted for i.e. 93° elbows
are equal to 1 metre, each 45° elbow to 0.5 metres.
Example 1
Flue Lengths - Not Permissible
Example 2
Flue Lengths - OK
Example 3
Flue Lengths - OK
Graph Line F is suitable for Performa 9, 12, 15, 18 SL HE
Graph Line G is suitable for Performa 21,24 SL HE

© Baxi Heating UK Ltd 2008
20
Min. 2 metres
Fig. 19
50mm
Flue Trim
Position of ‘Jubilee’
Clip screw
Fig. 24
30mm
30mm
Fig. 21
Fig. 23
Fig. 20
Fig. 22
Adaptor
Spigot
3.9.2 General Fitting Notes
1. Cut a hole in the external wall which the concentric flue
assembly will pass through. The hole should allow the flue
to fall back to the boiler at an angle of at least 1.5°.
2. When completed the terminal must be at least 2 metres
above ground level (Fig. 19).
3. Measure and cut to size the concentric assembly and
any extensions that are being used.
4. Insert the concentric assembly through the hole from
outside the building.
5. If required, the flexible flue trim should be fitted prior to
this as it cannot be fitted after. Use the large ‘Jubilee’ clip
to secure the trim to the flue (See Fig. 20, trim shown
dotted), with the screw part of the clip at the bottom.
6. Connect any extensions or elbows that are being used
to the concentric assembly. Engage the extension, elbow
or concentric assembly in the boiler flue elbow. Fit the
boiler flue elbow to the boiler adaptor.
7. Ensure that the concentric assembly and any extensions
fall back to the boiler at an angle of at least 1.5° and that
the external air inlet is to the bottom.
8. Use suitable brackets to support the concentric
assembly and any extensions, and make good inside and
outside.
9. The 60Ø exhaust can now be fitted. Slide the adaptor
over the plain end of the 60Ø exhaust (Fig. 22) and
engage the exhaust in the terminal. Slide the adaptor down
over the spigot. Mark and drill the adaptor, using a 2mm
bit, as shown in Fig. 21. Secure the adaptor to the spigot
using one of the screws supplied.
10. If it is necessary to shorten the 60Ø exhaust or any of
the extensions, the excess material must be cut from the
plain end of the pipe.
11. Determine the position of the 60Ø exhaust and mark
on the wall a suitable position for the support bracket. If
extensions are being used, a support bracket is supplied in
each kit.
12. Drill the wall, and fit the bracket(s) using the plug and
screw provided.
13. Mark and drill the 60Ø exhaust, using a 2mm bit, as
shown in Fig. 23. Complete the installation of the 60Ø
exhaust, securing in the brackets.
14. Fit the 93° elbow/plume outlet and secure with the two
remaining screws supplied. Ensure the plume outlet is at
least 45° to the wall and that the ‘peak’ is uppermost (Fig.
24).