Saunier Duval Xeon 80ff Operating manual

221972A.11.01
7336
Hepworth Heating Ltd.,
Nottingham Road, Belper, Derbyshire. DE56 1JT
General/Sales enquiries:
Tel: [phone] Fax: [phone]
One Contact Local Service
Customer Services:
Tel: [phone]
Fax: [phone]
All replacement parts
All labour charges
All call-out charges
Thank you for installing a new Saunier Duval appliance in your home.
Saunier Duval appliances' are manufactured to the very highest standard so we are pleased
to offer our customers' a Comprehensive First Year Guarantee.
In the center pages are to be found your Guarantee Registration Card, which we recommend you complete and
return as soon as possible.
If this card is missing you can obtain a copy or record your registration by telephoning the Heatcall Customer
Service number 01773 828100.
Our Guarantee gives you peace of mind plus valuable protection against breakdown by covering the cost of:
Guarantee Registration
Fanned Flue Boiler
(S.I.T.)
This is a Cat I2H Appliance
Reference in these instructions to British Standards and Statutory
Regulations/Requirements apply only to the United Kingdom.
For Ireland the rules in force must be used.
The instructions consist of three parts, User, Installation and Servicing Instructions, which includes the Guarantee Registration
Card. The instructions are an integral part of the appliance and must, to comply with the current issue of the Gas Safety
(Installation and Use) Regulations, be handed to the user on completion of the installation.
To beleftwiththeuser
❏
✔
❏
✔
❏
✔
Instructions for Use
Installation and Servicing
REGISTER YOUR SAUNIER DUVAL APPLIANCE
FOR 1ST YEAR GUARANTEE PROTECTION
CALL 0208 247 9857
80ff

2
221972A
Testing and Certification
This boiler is tested and certificated for safety and performance. It is therefore important that no alteration is made to the boiler, without
permission, in writing, from Hepworth Heating Ltd.
Any alteration not approved by Hepworth Heating Ltd., could invalidate the certification, boiler warranty and may also infringe the current issue of
the Statutory Requirements, see Section 1.4.
CE Mark
This boiler meets the requirements of Statutory Instrument No. 3083 The boiler (Efficiency) Regulations, and therefore is deemed to meet the
requirements of Directive 92/42/EEC on the efficiency requirements for new hot water boilers fired with liquid or gaseous fuels.
Type test for purposes of Regulatioon 5 certified by: Notified body 0086.
Product/productioncertifiedby: Notified body 0086.
The CE mark on this appliance shows compliance with:
1. Directive 90/396/EEC on the approximation of the laws of the Member States relating to appliances burning gaseous fuels.
2. Directive 73/23/EEC on the harmonization of the Laws of the Member States relating to the electrical equipment designed for use within
certain voltage limits.
3. Directive 89/336/EEC on the approximation of the Laws of the Member States relating to electromagnetic compatibility.
INFORMATION FOR THE INSTALLER AND SERVICE ENGINEER.
Under Section 6 of The Health and Safety at Work Act 1974, we are required to provide information on substances hazardous to health.
CERAMIC FIBRE/INSULATION PADS.
Thesecancauseirritationtoskin,eyesandtherespiratorytract.Ifyouhaveahistoryofskincomplaintyoumaybesusceptibletoirritation.Highdust
levels are usual only if the material is broken. Normal handling should not cause discomfort, but follow normal good hygiene and wash your hands
before eating, drinking or going to the lavatory. If you do suffer irritation of the eyes or severe irritation to the skin seek medical attention.
THERMOSTATS
These contain very small amounts of xylene in the sealed phial and capillary. If broken, under normal circumstances the fluid does not cause a
problem, but in case of skin contact, wash with cold water. If swallowed drink plenty of water and seek medical attention.
CUT-OFF DEVICES
These contain activated charcoal and a very small amount of chlorodifluormethane in the sealed phial and capillary. If broken, under normal
circumstances the fluid does not cause a problem. If there is irritation to the eyes or skin then seek medical attention.
Spare Parts
REMEMBER, When replacing a part on this appliance, use only spare parts that you can be assured conform to the safety and
performancespecificationthatwerequire. DonotusereconditionedorcopypartsthathavenotbeenclearlyauthorisedbyHepworth
Heating Ltd.
Important Information
Introduction 3
Lighting the Boiler 4
General Data 1 5
Flue & Ventilation 2 8
Water Systems 3 9
Flue and Appliance Preparation 4 13
Boiler Installation 5 18
Commissioning 6 22
Instructions to User 7 25
Servicing 8 25
Fault Finding 9 27
Replacement Parts 10 33
Spare Parts 11 38
CONTENTS DESCRIPTION SECTION PAGE No.
INSTRUCTIONS
FOR USE
INSTALLATION
INSTRUCTIONS
SERVICING
INSTRUCTIONS

3221972A
4140
Diagram 1
4625
CONTROLS COVER
DATA &
SERIAL
NUMBER
LABEL
RESET
BUTTON
VIEWING WINDOW
SETTING POINT
CONTROL
THERMOSTAT
KNOB GAS SERVICE
COCK (Shown
Off)
Toobtainservice,pleasecallyourinstallerorHeatcall(Saunier
Duval’sownServiceOrganisation)usingthetelephonenumber
given on the controls tray.
Please be advised that the ‘Benchmark’ logbook should be
completed by the installation engineer on completion of
commissioning and servicing.
All CORGI Registered Installers carry a CORGI ID card, and
have a registration number. Both should be recorded in your
boilerLogbook. YoucancheckyourinstallerisCORGIregistered
by calling CORGI direct on :- 01256 372300.
Boiler Clearances
If fixtures are positioned close to the boiler space must be left
asshownindiagram2. Atleastaminimumclearanceof500mm
must be left in front of the boiler to allow for servicing.
Boilers Installed in a Compartment or
Cupboard
If the boiler is installed in a compartment or cupboard do not
obstruct any ventilation openings.
Do not use the compartment or cupboard for storage.
Introduction
WARNING. It is important that the case (not the controls tray)
is not disturbed or removed other than for servicing by a
competent person.
Please read these instructions and follow them carefully for the
safe and economical use of your boiler.
The Xeon ff series are fanned flue boilers designed to provide
central heating and indirect domestic hot water.
The boiler is fully automatic in operation having only one user
control, the control thermostat.
The Gas Safety (Installation and Use)
Regulations
In your interest and that of gas safety it is the law that ALL gas
appliances are installed by a competent person in accordance
with the above regulations.
Gas Leak or Fault
If a gas leak or fault exists or is suspected, the boiler must be
turned off, including the electrical supply and must not be used
until the fault has been put right.
Advice/help should be obtained from your installation/servicing
company or the local gas undertaking.
Electrical Supply Failure
Failure of the electrical supply will cause the burner to go out.
Should this occur, operation of the appliance will normally
resume after the electrical supply is restored.
If the boiler does not relight after an electrical supply failure the
overheat safety cutoff device may need resetting, remove the
controls cover and press the reset button, refer to diagram 1.
Overheat Safety Cutoff
If the overheat safety cutoff device operates on any other
occasionthananelectricalsupplyfailure,presstheresetbutton
asin“ElectricalSupplyFailure”. Iftheoverheatoperatesagain,
turn the appliance off and contact your installation/servicing
company.
Maintenance
Toensurethecontinuedefficientandsafeoperationoftheboiler
itis recommended thatitis checked andservicedas necessary
atregularintervals. Thefrequencyofservicingwilldependupon
the particular installation conditions and usage, but in general
once a year should be enough.
If this appliance is installed in a rented property there is a duty
or care imposed on the owner of the property by the current
issue of The Gas Safety (Installation and Use) Regulations,
Section 35.
It is the law that any servicing is carried out by a competent
person.
Instructions for Use

4
221972A
500mm
Additional clearances may be
required for installation
65mm
6mm6mm
FRONT
VIEW
100mm
0081N
SIDE OR
REAR FLUE
5mm
5mm
Diagram 2
Cleaning
WARNING. Thisappliancecontainsmetalparts(components)
and care should be taken when handling and cleaning, with
particular regard to edges.
Clean the casing occasionally by wiping it over with a damp
cloth or dry polishing duster.
Do not use an abrasive cleaner.
Boiler Electrical Supply
WARNING. This boiler must be earthed.
The boiler must only be connected to a 230V~50Hz supply
protected by a 3A fuse.
All wiring must be in accordance with the current issue of
BS7671.
Wiring to the boiler must be PVC insulated type to the current
issueofBS6500Table16,notlessthan0.75mm2(24/0.20mm).
The colours of three core flexible cable are:
Brown - live, Blue - neutral,
Green/yellow - earth.
As the markings on your plug may not correspond with these
colours continue as follows:
The cable coloured blue must be connected to the terminal
marked “N” or black.
The cable coloured brown must be connected to the terminal
marked “L” or red.
The cable coloured green/yellow must be connected to the
terminal marked “E”, or green or the earth symbol .
To Light the Boiler
WARNING. Sealed Systems
A sealed water system must be filled and pressurised by a
competent person.
Onlylighttheboilerwhenyouaresurethatthesystemhasbeen
filled and pressurised.
Thepressure gauge shouldshow at least0.7bar,anything less
thanthisfigurecouldindicatealeakandyouMUSTcontactyour
installation/servicing company.
If there is any doubt about the boiler being full of water consult
your installation/servicing company.
ALL SYSTEMS.
Turn the electrical supply on to the boiler and check that all
remote controls are calling for heat.
To Turn the Boiler On
Remove the controls cover, by withdrawing it forward and off,
see diagram 1.
Turn the control thermostat knob clockwise to any position
between MIN and MAX. The maximum temperature setting is
about 82oC (180oF), see diagram 1.
The boiler lighting operation is now automatic as follows.
The fan operates, followed by an ignition spark until the pilot is
lit. When the pilot is alight the ignition system switches off and
the main burner lights. The flames can be seen through the
viewing window, see diagram 1.
The main burner will remain alight until switched off by the
control thermostat or any remote control.
If the boiler is switched OFF, by hand, wait at least 30 seconds
before switching on again.
When the boiler switches off, both the pilot and main burner go
out.
The automatic lighting sequence will operate again when heat
is required.
Refit the controls cover.
It should be noted that this is a fan flue appliance and fan
operation may be heard.
To Turn the Boiler Off
Forshortperiods,turnthecontrolthermostatknobanti-clockwise
to “O” Off. To relight, turn the control thermostat knob to any
position between “MIN” and “MAX”.
For longer periods, turn the control thermostat knob fully anti-
clockwise to “O” Off and switch off the electrical supply to the
boiler.
To relight follow the lighting sequence given above.
Protection Against Freezing.
If the boiler is to be out of use for any long period of time during
severeweatherconditionswerecommendthatthewholeofthe
system, including the boiler, be drained off to avoid the risk of
freezingup. Makesurethat,iffitted,theimmersionheaterinthe
cylinder is switched off.
For the position of the serial number, see diagram 1.
Instructions for Use

5221972A
SIDE ELEVATION FRONT ELEVATION
B
AP C
D
EJL
M
C
L
D
N
F
G
H
PUMPED RETURN PUMPED FLOW
K
7339
WATER CONNECTIONS
22mm COPPER PIPE
GAS CONNECTIONS
RC1/2(1/2in. BSPT)
MODEL A B C D E F G H J K L M N P
80ff 70 300 63 146 78 360 146 94 700 574 14 63 130 38
1 General Data
Diagram 1.1
Important Notice
This boiler is for use only on G20 gas.
This boiler can be used on open vented or sealed water
systems.
When used on an open vented system domestic hot water can
only be provided by a pumped primary circulation.
Wherever possible, all material, appliances and components
used shall comply with requirements of applicable British
Standards.
Where no British Standards exist, materials and equipment
should be fit for their purpose and of suitable quality and
workmanship.
Sheet Metal Parts
WARNING. Wheninstalling orservicing thisboiler careshould
betakenwhenhandlingsheetmetalparts,toavoidanypossibility
of personal injury.
1.1 Statutory Requirements
Theinstallationoftheboilermustbecarriedoutbyacompetent
person in accordance with the relevant requirements of the
current issue of:-
The manufacturer’s instructions, supplied.
TheGasSafety(InstallationandUse)Regulations,TheBuilding
Regulations, Local Water Company Byelaws, The Health and
Safety at Work Act, Control of Substances Hazardous to
Health, The Electricity at Work Regulations and any local
regulations which may apply.
Detailedrecommendationsarecontainedinthecurrentissueof
the following British Standards and Codes of Practice:-
BS4814, BS6798, BS5440 Part 1 and 2, BS5546 Part 1,
BS5449, BS6891, BS6700, BS7074 Part 1 and 2, BS7593,
BS7671.
Manufacturer’s instructions must not be taken as overriding
statutory requirements

6
221972A
1 General Data
APPROX. m3/h
GAS
RATE ft3/h
Min. Medium Max.
2.36 2.51 2.67
83 89 94
DATA TABLE 1.
MODEL
TOTAL DRY
WEIGHT
(Including
Terminal)
LIFT
WEIGHT
WATER
CONTENT
GAS
CONNECTION
ELECTRICITY
RATING
WATER
CONNECTION
ELECTRICITY
SUPPLY
DATA LABEL
80ff
51 kg (112 lb)
45.3 kg (100lb)
3.35 litre (0.74 gallon)
Rc 1/2in.
71W
Internal fuse F1 & F2 (F1A)
2x22mm copper pipes from
top of case
230V~50Hz, fused 3A
Bottom right hand side of case
1.2 Data
See Table 1 and diagram 1.1.
All dimensions are given in millimetres (except as noted).
The Seasonal Efficiency Domestic Boilers UK (SEDBUK)
is 79.4%.
ThevalueisusedintheUKGovernment’sStandardAssessment
Procedure (SAP) for energy rating of dwellings. The test data
from which it has been calculated have been certified by B.S.I.
1.3 Range Rating
Thisboiler israngerated andmaybe adjusted tosuit individual
system requirements.
See diagram 1.2 for the ratings and settings.
1.4 Testing and Certification
Thisboileristestedandcertificatedforsafetyandperformance.
Itis, therefore,important thatno alterationis madetothisboiler
unless approved, in writing, by Hepworth Heating Ltd.
Any alteration not approved by Hepworth Heating Ltd., could
invalidate certification, boiler warranty and could also infringe
the statutory requirements.
1.5 Gas Supply
The gas installation shall be in accordance with the current
issue of BS6891.
The supply from the governed meter must be of adequate size
toprovideasteadyinletworkingpressureof20mbar(8inwg)at
the boiler.
Oncompletion test thegas installation forsoundnessusing the
pressure drop method and suitable leak detection fluid, purge
in accordance with the above standard.
1.6 Electrical Supply
WARNING. This boiler must be earthed.
All system components shall be of an approved type and shall
be connected in accordance with the current issue of BS7671
and any applicable local regulations.
Connection of the boiler and system controls to the mains
supply must be through a common isolator and must be fused
3A, maximum. This method of connection must be by a fused
doublepoleisolatingswitch,withaminimumcontactseparation
of3mm onboth poles. Theswitch shouldbe readilyaccessible
and preferably adjacent to the appliance. It should supply the
appliance only and be easily identifiable as so doing.
Alternatively, an unswitched shuttered socket outlet and 3A
fused 3 pin plug, both to the current issue of BS1363 may be
usedprovidedthattheyarenotusedinaroomcontainingabath
or shower.
WiringtotheboilermustbetothecurrentissueofBS6500Table
16, not less than 0.75mm2(24/0.20mm).
1.7 Contents of Packaging
The boiler is delivered in one pack, refer to Section 4.1 for
contents.
1.8 Water System
This boiler may be fitted to an open vented or a sealed water
system.
Diagram 1.2
9946

7221972A
Diagram 1.3
500mm
Additional clearances may be
required for installation
65mm
6mm6mm
FRONT
VIEW
100mm
0081N
SIDE OR
REAR FLUE
5mm
5mm
1 General Data
1.9 Drain
System
A drain tap must be provided at the lowest points of the system
which will allow the entire system, boiler and hot water cylinder
be drained.
Draining taps should be to the current issue of BS2879.
Boiler
Adrainingpointisfittedatthebottomrighthandsideoftheheat
exchanger.
Cover controls to avoid water damage.
If required remove the combustion chamber front cover to
improve access.
1.10 Safety Valve
A safety valve need not be fitted to an open vented system.
1.11 Location
This boiler is not suitable for outdoor installation.
This boiler may be installed in any room, although particular
attention is drawn to the requirements of the current issue of
BS7671 with respect to the installation of a boiler in a room
containing a bath or shower. The electrical provisions of the
Building Standards (Scotland) apply to such installations in
Scotland.
The boiler must be mounted on a flat wall which is sufficiently
robust to take its total weight.
Theboiler maybe fittedto awall madeofcombustiblematerial.
1.12 Boiler Clearances
Refer to diagram 1.3.
This boiler must be positioned so that at least the minimum
operational and servicing clearances are provided.
Additional clearances may be required for installation.
Iffixturesarepositionednext to the boiler they should be made
removable for access to pipework.
At least a minimum of 500mm clearance must be left in front of
the boiler for servicing, see diagram 1.3.
1.13 Room Ventilation
The boiler is room sealed and does not require the room or
space containing it to have permanent air vents.
1.14 Boilers in a Compartment
Wheretheinstallationoftheboilerwillbeinanunusualposition,
special requirements are needed, the current issue of BS6798
gives detailed guidance on these requirements.
A compartment used to enclose the boiler must be designed
and constructed specifically for this purpose. An existing
cupboard or compartment modified for the purpose may be
used. Details of essential requirements for cupboard or
compartment design are given in the current issue of BS6798.
The doorway opening should be of sufficient size to allow for
easy removal of the boiler.
Where the boiler is fitted in a cupboard or compartment,
permanenthighandlowlevelventilationmustbeprovided. The
minimum ventilation areas required are given in Table 2.
1.15 Timber Frame Building
If the boiler is to be installed in a timber frame building it should
be fitted in accordance with the Institute of Gas Engineers
documentIGE/UP/7/1998. Ifindoubtseekadvicefromthelocal
gas undertaking or Hepworth Heating Ltd.
1.16 Heating System Controls
The heating system should have installed: a programmer and
room thermostat controlling the boiler.
Thermostatic radiator valves may be installed, however they
mustnotbefittedinaroomwherearoomthermostatislocated.
Note: For further information, see The Building Regulations
1991-Conservationoffuelandpower, 1995edition-Appendix
G, table 4b.
TABLE 2. COMPARTMENT AIR VENTS
VENTILATION HIGH LEVEL LOW LEVEL
REQUIREMENTS VENT AREA VENT AREA
VENTILATION
FROM ROOM
OR SPACE
VENTILATION
FROM
OUTSIDE
cm2in2cm2in2
264 41 264 41
264 41 264 41
132 21 132 21
132 21 132 21
MINIMUM CLEARANCES FROM WALLS
CEILING, FLOOR, CUPBOARD, WORKTOPS,
AND INFLAMMABLE MATERIALS

8
221972A
2 Flue andVentilation
A
A
FGEA
G
G
G
B,C B,C
FF
K
K
K
C
G
LL
Diagram 2.1
MINIMUM SITING DIMENSIONS
FOR FANNED FLUE
TERMINALS POSITION
ADIRECTLY BELOW, ABOVE OR
HORIZONTALLY TO AN OPENING,
AIR BRICK, OPENING WINDOWS,
AIR VENT OR ANY OTHER
VENTILATION OPENING. 300
BBELOW GUTTER, DRAIN/SOIL PIPE 75
CBELOW EAVES 200
DBELOW A BALCONY OR CAR PORT 200
EFROM VERTICAL DRAIN PIPES AND
SOIL PIPES 75
FFROM EXTERNAL CORNERS 300
GABOVE ADJACENT GROUND OR
BALCONY LEVEL 300
HFROM A SURFACE FACING THE
TERMINAL 600
IFACING TERMINALS 1200
JFROM OPENING (DOOR/WINDOW) IN
CAR PORT INTO DWELLING 1200
KVERTICAL FROM A TERMINAL 1500
LHORIZONTALLY FROM A TERMINAL 300
MFROM INTERNAL CORNERS 25
MINIMUM
SPACING
in mm
0103M
Under Car Port etc.
H,I
JD
F
K
M
Note. Detailed recommendations for flue are given in the
current issue of BS5440 Part 1.
2.1 Terminal Position
The minimum acceptable siting dimensions for the terminal
fromobstructions, other terminalsandventilation openings are
shown in diagram 2.1.
The terminal must be exposed to the external air, the position
allowing free passage of air across it at all times.
Car ports or similar extensions of a roof only, or a roof and one
wall,requirespecialconsiderationwithrespecttoanyopenings,
doors, vents or windows under the roof. Care is required to
protect the roof if it is made of plastic sheeting. If the car port
consists of a roof and two or more walls, seek advice from the
local gas company before installing the boiler.
If the terminal is fitted within 600mm below plastic guttering or
painted soffitanaluminiumshield1500mmlongshouldbefitted
immediately beneath the guttering or eaves. If the terminal is
fittedwithin450mmbelowpaintedeavesorapaintedgutter,an
aluminium shield 750mm long should be fitted immediately
beneath the guttering or eaves.
2.2 Terminal Guard
A terminal guard is required if persons could come into contact
with the terminal or the terminal could be subject to damage.
If a terminal guard is required, it must be positioned to provide
aminimumof50mmclearancefromanypartoftheterminaland
be central over the terminal.
A suitable guard, reference Type “K3”, can be obtained from:
Tower Flue Components Ltd
Morley Road
Tonbridge
Kent
TN9 1RA
0161M

9221972A
Diagram 3.1
3Water Systems
Theinstallationoftheboilermustcomplywiththerequirements
of the current issue of BS6798.
3.1 Frost Protection
If the position of the boiler is such that it may be vulnerable to
freezing it should be protected as specified in the current issue
ofBS5422.Itisrecommendedthatafrostprotectionthermostat
be fitted.
3.2 Pump
The pump, with integral valves, should be fitted in the heating
flow pipework from the boiler, it should be set to produce a
temperature difference of 11oC (20oF) between the flow and
return, with the boiler thermostat set at “MAX”, which is about
82oC (180oF).
The pressure loss of the boiler can be found from diagram 3.1.
High resistance microbore systems may require a higher duty
pump.
3.3 Bypass - Fully Pumped and Sealed Water
System
A bypass is usually unnecessary on systems using a 3 port
diverter valve since one port will remain in the open position at
all times. This allows satisfactory operation of the pump
overrun.
Howeverifthermostaticradiatorvalvesarefittedtoallradiators
or two port valves are used a bypass is required.
The bypass connection must be at least 2.5 metres away from
the boiler.
Theflow through theboilermust not beallowed to fallsuchthat
thereisatemperaturedifferencegreaterthan20oCbetweenthe
flow and return.
3.4 Water System
Foran openvented systemthe boilermust besuppliedfroman
unrestricted water supply taken from a feed and expansion
cisternfittedatamaximumheightof27metresabovetheboiler.
The cold feed must be 15mm minimum size.
It is important that the relative positions of the pump, cold feed
and open vent are as shown in diagram 3.2.
Theunrestrictedopenventfromtheboilermustrisecontinuously
to discharge over the feed and expansion cistern.
3.5 Domestic Hot Water System
General. Thedomestichotwaterservicemustbeinaccordance
withthecurrent issue of BS5546,referalso to the currentissue
of BS6700.
3.6 Cylinder
Forallsystems supplying domestic hot water thecylindermust
be indirect. It is recommended that the cylinder be fitted with
some form of temperature control.
3.7 Fully Pumped Domestic Hot Water
The connection for this type of system MUST be as shown in
diagram 3.2 and 3.3.
3.8 Inhibitor
Attention is drawn to the current issue of BS5449 and BS7593
on the use of inhibitors in central heating systems.
Ifaninhibitoristobeused,contactamanufacturerorHepworth
Heating Ltd., for their recommendations as to the best product
to use.
When installing in an existing system take special care to drain
theentiresystem,includingradiators,thenthoroughlycleaning
outbeforeinstallingtheboilerwhetherornotaddinganinhibitor.
3.9 Sealed Water Systems
Theinstallationshouldcomplywiththeappropriaterequirements
ofthecurrent issue of BS4841, BS5449,BS6759,BS6798and
BS7074 Part 1 and 2, see diagram 3.4 for suggested layout.
3.10 Safety Valve
A safety valve must be fitted to a sealed water system.
It shall be preset, nonadjustable with a lift pressure of 3bar,
incorporating seating of a resilient material, a test device and a
connection for drain.
The drain from the safety valve must be routed clear of any
electrical fittings and positioned so that any discharge can be
seen.
PRESSURE LOSS
OF BOILER
1000
750
500
250
0051015 20 25 30
Flow rate (litres/minute)
Water pressure loss
(mm head of water)
30.6
litre/min
Design Flow Rate
0088(a)M

10
221972A
3Water Systems
Diagram 3.2
6458
FEED AND
EXPANSION
CISTERN
22mm VENT
(MIN.)
15mm (MINIMUM)
COLD FEED
OPEN VENTED FULLY PUMPED WATER SYSTEM
RECOMMENDED RELATIONSHIP BETWEEN
PUMP COLD FEED AND VENT
450mm
MIN.
HEIGHT
1150mm
MIN.
RETURN FLOW
CYLINDER
PUMP
HEATING
150mm
MAX.
BOILER
IF REQUIRED
22mm (MINIMUM)
BY-PASS WITH
LOCKSHIELD VALVE
FLOW
RET.
Diagram 3.3
1metre Min.
27 metres
Max.
22mm VENT & 15mm COLD FEED
TO BE FITTED IN ACCORDANCE
WITH BS 5449
INDIRECT
CYLINDER ALTERNATIVE
SYSTEM
CONTROL
VALVES
HEATING
SYSTEM
PUMP
FULLY PUMPED CIRCULATION
SYSTEM (DIAGRAMMATIC)
6462
IF REQUIRED
BYPASS 22mm
MIN WITH
LOCKSHIELD
VALVE
28mm
PIPE
RETURN
FLOW
4114
1metre Min.
27 metres
Max.
22mm FOR COMBINED FEED & VENT
TO BE FITTED IN ACCORDANCE
WITH BS 5449
INDIRECT
CYLINDER
ALTERNATIVE
SYSTEM
CONTROL
VALVES
HEATING
SYSTEM
PUMP
FULLY PUMPED CIRCULATION
BYPASS (DIAGRAMMATIC)
6463
IF REQUIRED
BYPASS 22mm
MIN WITH
LOCKSHIELD
VALVE
3.11 Expansion Vessel
A diaphragm type expansion vessel, conforming to the current
issue of BS4814 (see also BS7404 Part 1 and 2) must be
connected at a point close to the inlet side of the circulating
pump, see diagram 3.4 unless laid down differently by the
manufacturer.
The expansion vessel volume depends upon the total water
systemvolume andtheinitial systemdesign pressure. Forany
systeman accuratecalculation ofthe vesselsize isgiveninthe
current issue of BS7074 Part 1.
Example. For an initial system design pressure of 0.7bar the
minimum total vessel volume required is 0.063xTotal System
volume.
Note. A higher initial design pressure requires a larger volume
expansion vessel.
Guidance on vessel sizing is also given in the current issue of
BS5449 and BS7074 Part 1.
Thechargepressuremustnotbelessthanthestaticheadofthe
system, that is, the height of the highest point of the system
above the expansion vessel.
The water content of the boiler is given in Data Table 1.
3.12 Pressure Gauge
A pressure gauge with a set pointer and covering at least the
range 0 to 4bar (0 to 60lb/in2) shall be permanently fitted to the
system in a position where it can be seen when filling the
system.
22 X 28
UNION
CONNECTION

11 221972A
METHOD 1
METHOD 2
METHOD 3
SUPPLY STOP
VALVE
SUPPLY
PIPE
HOSE
UNIONS SERVICING
VALVE
TEMPORARY
HOSE
HEATING
SYSTEM
HEATING
SYSTEM
TEMPORARY
HOSE
HOSE
UNIONS SERVICING
VALVE
SUPPLY
PIPE
SUPPLY STOP
VALVE
DOUBLE CHECK
VALVE ASSEMBLY
HEATING
SYSTEM
SERVICING
VALVE
SUPPLY
STOP VALVE
SUPPLY
PIPE
HOSE
UNIONS DOUBLE CHECK
VALVE ASSEMBLY
OVERFLOW
CISTERN
COMBINED
CHECK VALVE
AND VACUUM
BREAKER
PRESSURE
REDUCING
VALVE
0051M
Diagram 3.4
3 LITRES (0.66 gals)
MAKE-UP BOTTLE
(if required)
NON-RETURN
VALVE
AUTO
AIR
VENT
FLOW
DRAIN
COCK BOILER
SAFETY
VALVE
(Make-up
alternatives) EXPANSION
VESSEL
PRESSURE
GAUGE
CIRCULATING
PUMP
FILLING POINT
AIR
RELEASE
POINT
HEATING CIRCUIT
IF REQUIRED
22mm (min)
BY-PASS WITH
LOCKSHIELD
VALVE
RETURN
6465
3Water Systems
Diagram 3.5
3.13 Domestic Hot Water Cylinder
SINGLEFEEDINDIRECTCYLINDERSARENOTSUITABLE.
Thedomestichotwatercylindermustbeoftheindirectcoiltype.
It must be suitable for working at a gauge pressure of 0.35bar
above the safety valve setting.
3.14 Domestic Hot Water System - Unvented
Wherea storagesystemwill not havea vent toatmosphere the
installation must comply with Building Regulations and local
WaterCompanyBye-laws,seealsothecurrentissueofBS6700.
If fitting into an existing system the local authority must also be
advised.
3.15 Filling a Sealed Water System
Provisionforfillingthesystematlowlevelmustbemade. Three
methodsareshownindiagram3.5. Theremustbenopermanent
connection to the mains water supply, even through a non-
return valve.
3.16 Water Makeup
Provision must be made for replacing water lost from the
system. A make up vessel mounted above the highest point of
the system and connected through a non-return valve to the
system on the return side of either the hot water cylinder or
heating system, see diagram 3.4.
Alternativelyprovisionformakeupcanbemadebyafillingloop.

12
221972A
4 Flue and Appliance Preparation
Diagram 4.1
Diagram 4.2
Diagram 4.3
Standard Flue terminal illustrated.
Standard Flue terminal illustrated.
6827
6828
REAR FLUE LENGTHS
Distance R = Wall thickness
STD. 75mm to 505mm
1M 75mm to 1015mm
2M 75mm to 2015mm
3M 75mm to 2995mm
SIDE FLUE LENGTHS
Distance S = External wall face to boiler case
STD. 81mm to 513mm
1M 81mm to 1023mm
2M 81mm to 2023mm
3M 81mm to 3003mm
4791
CARTON
TOP
LOOSE
ITEMS PACK
WALL
TEMPLATE
INSTRUCTIONS
MOUNTING
BRACKET
BOILER
4.1 Unpacking
Open the carton, check the items supplied against the boiler
pack contents list on the flap, see diagram 4.1.
4.2 Flue Position and Length
Determine flue application, length and terminal position before
starting.
Refer to diagram 4.2 or 4.3.
Ifyou areusinga FlueBendor aVerticalFlue Kit,pleasefollow
the instructions supplied with that kit.
To make a neat finish to the flue outlet a flue collar kit, part No.
459248, with instructions, is available.
Theuseofthiscollarwillmeanthatthefluelengthswillneedto
be altered, full instructions are given in the kit.
Note: If required, an optional Wall Sleeve Kit, part No.900864,
is available, complete with fixing instructions.
4.3 Flue Preparation
Allflueassembliesaredesignedforinternalinstallation(optional
wall liner is required), given that there is sufficient clearances
opposite to the flue for the installation of the flue.
If there is insufficient clearance the flue can be installed from
outside.
For a wall thickness up to 300mm, provided that there is
sufficientspaceandtheoptionalwalllinerkitisusedthefluecan
be fully installed from the inside.

13 221972A
4 Flue and Appliance Preparation
Diagram 4.4
SIDE FLUE
REAR FLUE
75mm
115mm
MINIMUM
HOLE
0098M
BOILER
CENTRE LINE FLUE
CENTRE LINE
14mm
For a wall thickness of over 300mm the external flue hole will
needtobemadegoodfromtheoutside. Thisappliesalsoifyou
use the flue kit without the optional kit, irrespective of wall
thickness.
4.4 Rear and Side Flue Application
Select the boiler location and flue application, with due regard
to the terminal position.
Takethetemplatefromtheboilerpackandtemporarilyposition
it on the wall, making sure that the minimum clearances are
maintained, see diagram 1.2.
For a rear flue mark the position of the flue as diagram 4.4.
Forasideflue,extendthecentrelinehorizontallyleft or right to
the corner adjacent surface where the flue is required to exit to
outside. Mark the position of the centre of the flue and boiler,
see diagram 4.4.
4.5 Flue Hole Cutting
Having marked out the flue centre cut a hole for the flue using,
preferably, a 115mm minimum core drill.
4.6 Wall Mounting Bracket
Repositionthetemplate,makingsureofdimensionalalignment
with the flue hole.
Marktheboilerfixingpointsandmountingbracketposition,see
diagram 4.5.
Drill holes and plug, to suit No.12x2in woodscrews, fit the
screwsallowingsufficient clearance, about 5mm,toaccept the
swing brackets, see diagram 4.5.
Secure the mounting bracket to the wall with No.12x2in
woodscrews and plugs, see diagram 4.5.
Diagram 4.5
5mm
TEMPLATE
FLUE
CENTRELINE
BOILER
MOUNTING
BRACKET
BOILER
CENTRELINE
MOUNTING
BRACKET FIXING
POINTS
FLUE
CENTRELINE
BOILER
CENTRELINE
TOP BOILER
MOUNTING
HOLES
7 dia.
7 dia.
3/16 in dia.
PLUG
NO.
12x2in
3/16 in dia.
PLUG
NO.
12x2in
4096

14
221972A
Diagram 4.6
Diagram 4.7
Diagram 4.8
FLUE
DUCT LONG FLUE
TERMINAL
STANDARD FLUE
TERMINAL
Q PLUS 5mm
Q
BOILER
CENTRE
LINE
T MINUS 188mm
6833
6831
6829
4 Flue and Appliance Preparation
4.7 Flue Duct
Mark the duct to the length required, this length allows for
expansion, see diagram 4.6 for rear flue and diagram 4.7 for
side flue, then cut square and remove any burrs.
4.8 Air Duct/Terminal
Markthe ductlength, seediagram 4.8for rearflueanddiagram
4.9 for side flue, then cut square and remove any burrs.
4.9 Air Duct/Terminal and Flue Duct Assembly
Locatetheflueductintotheairduct/terminal,seediagram4.10.
Take the flue manifold from the loose items pack together with
the sealant. Place the sealant onto the flue manifold.
Fully locate the flue manifold in to the air duct/terminal and flue
ductassemblyasshownindiagram4.10,makesurethecorrect
alignment of the “Top”s.
Drilltwo3mmdiameterholesthroughtheairduct/terminaltothe
flue manifold secure with the two self tapping screws supplied
in the loose items pack.
It should now not be possible to remove the manifold.
Q

15 221972A
4 Flue and Appliance Preparation
Diagram 4.9
BOILER
CENTRE
LINE
LONG FLUE
TERMINAL
STANDARD
FLUE
TERMINAL
6830
4.10 Rear Fitting
Fittheselfadhesivefoamsealprovidedintheflue packaround
the air duct/terminal at the position shown in diagram 4.13.
4.11 Side Fitting
Fittheselfadhesivefoamsealaroundtheairduct/terminalsuch
that,wheninstalled,thesealwillbewithinthewall,seediagram
4.14.
If dimension "A" is greater than 75mm from the wall, the self
adhesivefoamsealcanbedispensedwith,andtheareaaround
the flue made good in the normal way, see diagram 4.14.
Important:Ifthewalllinerkitisusedtheselfadhesivefoamseal
included in the wall liner kit must be used in place of the one
suppliedwiththeflue pack,seediagram4.11 forpositionofself
adhesive seal.
Diagram 4.10
AIR DUCT/TERMINAL
AND FLUE DUCT
ASSEMBLY
4616

16
221972A
4 Flue and Appliance Preparation
4.12 Flue Assembly - Installation
Iftheboiler is not to befittedfor some time cover theholein the
wall.
Onlimitedaccess installations push the flue assemblyintoand
throughthe holesuch thatit iswithin thewallanddoesnotstick
out into the room, see diagram 4.12. Do not push the flue
assembly too far into the holes as it has to be pulled back into
the boiler and secured.
4.13 Internal Access Flue
Ifaccess totheoutsidewallis notpractical,thefluesystem can
be installed from inside. Use of the optional wall liner kit is
required.
Diagram 4.11
Diagram 4.12
FOAM
SEAL
FOAM
SEAL
WALL THICKNESS-
OVER 300mm
10mm
WALL THICKNESS-
UP TO 300mm
Q-25mm
Q
Q
GASKET
(PRE-ATTACHED)
6832
4082
;
;
;
;
;
;
Diagram 4.13
6930
Diagram 4.14
6931
FOAM
SEAL
"A"
REAR FITTING
SIDE FITTING
FOAM
SEAL
WITH WALL LINER KIT ONLY

17 221972A
5 Boiler Installation
Diagram 5.1
CONTROLS
COVER
NUT(3)
FRONT
COVER
SHAKEPROOF
WASHER
4115
NUT
5 Boiler Preparation
With the boiler still in the bottom tray, slide the controls tray
upwards and remove it as shown in diagram 5.1.
Removethefrontcoverbyundoing(andkeeping)thescrewand
wing nuts and lifting the front cover off, see diagram 5.1.
Remove the packing piece from inside the front cover.
Place front cover on one side until required.
Fit suitable compression fittings to the boiler connections.
5.2 Mounting the Boiler
As necessary, fit the blanking plate, see diagram 5.2.
Now make sure that the top, swing brackets are UPRIGHT.
Lift the boiler into position, hooking over the mounting bracket.
Swing the brackets over the two screws at the top. Hold the
swing bracket(s) in place whilst tightening the screw(s) on to it,
see diagram 5.3.
Remove the blue and red electrical connections from the fan,
see diagram 5.4.
Break the air pressure switch tube connections, see diagram
5.4.
Remove the fan assembly by removing the screws at the front,
slackeningthescrewsattherearandslidingitout,seediagram
5.4. Taking care not to damage the gasket.
Securetheflueassemblytotheboilerusingthepreviouslyfitted
dogpoint screws noting that these are keyhole fixings, see
diagram 5.5.
Make sure of the correct fitting of the flue to the boiler.
For a side outlet cut the fan duct extension to the length
required, see diagram 5.6.
Remove any burrs and fit as diagram 5.6.
Fitthe fan ductextensionto the elbowand assembly tothefan,
see diagram 5.6
Do not secure at this point with the screw.
Position the fan assembly and engage the fan duct extension
over the flue manifold. Make sure, by pushing in the flue duct
extensionthatasecuresealismade. Markthefinalposition of
the fan duct extension in the screw hole on the elbow, remove
the assembly, seal with sealant, supplied in the loose items
pack and secure with the screw as diagram 5.6.
Secure the elbow to the fan outlet with the Jubilee clip.
For rear outlet cut and fit the fan duct extension as shown in
diagram 5.6.
Fit fan assembly by engaging the fan duct extension over the
flue manifold spigot, see diagram 5.7.
Securethefan assembly with thescrewspreviously slackened
and removed.
Reconnect the blue and red electrical connections to the fan,
the polarity of the connections is not important.
Reconnect the air pressure switch tubes as shown in diagram
5.4.
Diagram 5.2
4617
WING
NUT
GASKET BLANKING
PLATE

18
221972A
5 Boiler Installation
Diagram 5.4
ELECTRICAL
CONNECTIONS
REAR SECURING SCREW (2)
(SLACKEN but do not remove)
GASKET
4086
AIR PRESSURE TUBES
CLEAR RED
SECURING
SCREW (2)
0167(a)M
Diagram 5.3
5mm
MOUNTING
BRACKET
SWING
BRACKET
SECURING
SCREWS (2)
NOTE:
PIPES REMOVED
FOR CLARITY
5.3 Water Circulation System
Complete the water connections to the boiler.
Fill, vent and flush the system.
Check for any water leaks and put right.
5.4 Safety Valve Discharge
Fit a suitable discharge pipe to the safety valve and route it to
outside the building so that any discharge can be seen but will
notcauseinjurytopersons,damagetopropertyoranyelectrical
installation.
5.5 Gas Connection
Make the gas connection to the Rc1/2in gas service cock, see
diagram 6.1.
Check for leaks using a suitable leak detection fluid.
5.6 Control Box Removal
Removetheelectricalcontrolboxsecuringscrews,seediagram
5.8. Slide the box forwards and release, hook it onto the lip
bracket at the front, see diagram 5.8.
Diagram 5.5
KEYHOLE
LOCATION
LUG
4134

19 221972A
Diagram 5.6
Diagram 5.7
5 Boiler Installation
FLUE
MANIFOLD
SPIGOT
(REAR FLUE OUTLET ILLUSTRATED)
VERTICAL
REAR
RIGHT
LEFT
SCREW
(2)
JUBILEE
CLIP
Cutting 'MARK' lengths.
Lefthand flue does not require cutting.
SIDE
LEFT
FAN
DUCT
EXTENSION
SIDE
RIGHT
REAR
FLUE ELBOW
FAN
DUCT
EXTENSION
FAN DUCT
EXTENSION
2.5mm
dia.drill
4089
4093
5.7 Electrical Connection
WARNING. This boiler must be earthed.
Take care not to damage any internal wiring and capillaries.
Takeplasticcableretainingclip,fromthelooseitemspack,peel
offthebackingpaperandpositionitinasuitableplacetosecure
the incoming cable.
Using heat resistant (to 85oC) cable of at least 0.75mm2(24/
0.2mm)tothe currentissueofBS6500Table 16andofsuitable
length, thread through cable clamps, secure into the plastic
clipsandconnecttoappropriateterminals,seediagram5.9and
9.5.
Standard colours are, brown - live (L), blue - neutral (N) and
green and yellow - earth (E).
The mains cable outer insulation must not be cut back external
to the cable clamp.
Make sure the cable is suitably secured.
Whenmakingconnections,makesure thattheearthconductor
ismadeofagreaterlengththanthecurrentcarryingconductors,
so that if the cable is strained the earth conductor would be the
last to become disconnected.
5.8 Pump Connection
The pump must be connected directly to the control box, as
shown in diagram 5.9 threading the cable through the cable
clamp in the side of the control box.
5.9 External Controls
Anyexternalcontrolsmustonlybewiredtointerrupttheredlink
between terminals SL and 9.

20
221972A
Diagram 5.10
4619
3310
5 Boiler Installation
Make sure that the supply cable and all external cables are
secured and away from hot surfaces.
5.10 Testing
Checks to ensure electrical safety must be carried out by a
competent person.
After installation of the system, preliminary electrical system
checks as below should be carried out.
1. Test insulation resistance to earth.
2. Test continuity and short circuit of all cables,
3. Test the polarity of the mains.
The installer is requested to advise and give guidance to the
user on the controls scheme used with the boiler.
Remove red link between 9 & SL when fitting
a time control etc (if no switch is fitted, link will
make the circulation pump run constantly).
FIXING SCREWS
LIP BRACKET
IGNITION
LEAD
PUMP
CABLE
CABLE
CLAMPS
MAINS
CABLE
4620