Halstead CFF80 Operating manual

2000225008D.10.02
Chimney Fanned Flue Boiler
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
9919
Model: CFF80
G.C. No. 41-333-97
Halstead Boilers Limited, 20/22 First Avenue, Bluebridge Industrial Estate, Halstead, Essex CO9 2EX
Tel: [phone]. Sales Direct Line: 01787 475557. Fax: [phone]. Service Helpline: 01926 834834.
e-mail: [email protected] or [email protected] Website: www.halsteadboilers.co.uk

2
2000225008D
TESTING AND CERTIFICATION
Thisboileristestedandcertificated forsafetyandperformance. Itisthereforeimportantthatnoalterationismadetotheboiler,without
permission, in writing, from Halstead Boilers Ltd.
Any alteration not approved by Halstead Boilers Ltd., could invalidate the certification, boiler warranty and may also infringe the
current issue of the Statutory Requirements, see Section 1.3.
CE MARK
This boiler meets the requirements of Statutory Instrument No. 3083 The boiler (Efficiency) Regulations, and therefore is deemed
tomeettherequirementsofDirective92/42/EEContheefficiencyrequirementsfornewhotwaterboilersfiredwithliquidorgaseous
fuels.
Type test for purposes of Regulation 5 certified by: Notified body 0086.
Product/production certified by: 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, GlassYarn.
These can cause irritation to skin, eyes and the respiratory tract. If you have a history of skin complaint you may be susceptible to
irritation. High dust 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.
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. Donotusereconditionedorcopypartsthathavenotbeen clearlyauthorisedbyHalstead
Boilers Ltd.
MANUAL HANDLING GUIDANCE
During the appliance installation and the replacement of the heat exchanger it will be necessary to employ caution and assistance
whilst lifting as the appliance or component exceeds the recommended weight for a one man lift.
In certain situations it may be required to use a mechanical handling aid.
Take care to avoid trip hazards, slippery or wet surfaces.
Important Information
Introduction 3
Lighting the Boiler 4
General Data 1 5
Water Systems 2 8
Flue & Ventilation 3 9
Installation 4 10
Electrical Wiring 5 17
Commissioning 6 18
Instructions to User 7 20
Servicing 8 20
Fault Finding 9 23
Replacement Parts 10 26
Spare Parts 11 28
CONTENTS DESCRIPTION SECTION PAGE No.
INSTRUCTIONS
FOR USE
INSTALLATION
INSTRUCTIONS
SERVICING
INSTRUCTIONS

32000225008D
Instructions for Use
Introduction
Pleasereadthese instructions and followthemcarefully for the
safe and economical use of your boiler.
TheHalsteadBuckingham4CFF seriesarefannedflueboilers
with a chimney flue adapter. They provide heating and if
required, an indirect domestic hot water supply.
The boiler is automatic in operation, having only one user
control, the boiler temperature control.
Gas Safety (Installation and Use) Regulations
Inyourowninterestsandthatofsafety,itisthelawthatALLgas
appliances are installed by a competent person in accordance
with the current issue of the above regulations.
WARNINGS
Gas Leak or Fault
If a gas leak 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 the local gas undertaking or your
installation/ servicing company.
Clearances
Make sure that nothing obstructs the ventilation grills or
clearances.
Minimum clearances must be left around the boiler as
shown in diagrams 1.4, 1.5 & 1.6.
Sheet Metal Parts
This boiler contains metal parts (components) and care
shouldbetakenwhenhandlingandcleaning,withparticular
regard to edges.
Cleaning
Keep the casing clean by wiping it occasionally with a damp
soapy cloth and dry with a polishing cloth.
Do not use abrasive cleaners.
Boilers Installed in a Compartment
If the boiler is fitted in a compartment, cupboard etc., do not
obstruct the purpose built compartment vents or the grill on the
boiler.
Do not use the compartment for storage purposes.
Protection Against Freezing
Iftheboileristobeoutofuseforanyperiodoftimeduringsevere
weatherconditionswerecommendthewholesystemincluding
the boiler, be drained off to avoid the risk of freezing up. If an
immersion heater is fitted to the hot water cylinder make sure it
is switched off.
Maintenance
Toensurethecontinuedefficientandsafeoperationoftheboiler
itisrecommended that it ischeckedand serviced asnecessary
atregularintervals. Thefrequencyofservicingwilldependupon
the particular installation conditions and usage, but in general
once a year should be enough.
It is the law that servicing must be carried out by a competent
person.
If this appliance is installed in a rented property there is a duty
ofcareimposedontheownerofthepropertybythecurrentissue
of the Gas Safety (Installation and Use) Regulations, Section
35.
To obtain service please call your installer or Halstead Boilers
using the telephone number given on the inside of the front
panel.
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 Electrical Supply
THIS BOILER MUST BE EARTHED.
The boiler must only be connected to a 230V~50Hz supply
protected by a 3A fuse, maximum.
All wiring must be in accordance with the current issue of
BS7671.
Heatresistantflexiblecablehavingaconductorsizeof0.75mm2,
to the current issue of BS6500 Table 16 must be used.
To Connect an Electrical Plug
The standard colours of three core flexible cable are,
Brown - live, Blue - neutral, Green and Yellow - earth.
As the markings on your plug may not correspond with these
colours, continue as follows:
The Blue cable must be connected to the terminal marked “N”
or “Black”.
TheBrown cable must be connectedto the terminal marked “L”
or “Red”.
The Green and yellow cable must be connected to the terminal
marked “E” or “Green” or the earth symbol .

4
2000225008D
To Turn the Appliance On
Turn the electrical supply on to the boiler and check that all
remote controls are calling for heat.
Turn the boiler temperature control clockwise to any position
between “0” and MAX, see diagram 1.
"Max" is approximately 82°C (180°F).
The boiler lighting operation is now automatic as follows:
The fan operates and after a short period of time, the spark
ignition operates, the solenoid opens, then the burner will light
shown by the burner ON neon (green) on the control panel
lighting up.
The burner will remain alight until switched off by the control
thermostat or any remote control.
Note: If the boiler is turned OFF at the boiler temperature
control, wait at least 30 seconds before switching on again.
When the boiler switches off, the burner will go out.
The automatic lighting sequence will operate again when heat
is required.
It should be noted that this is a fanned flue appliance and fan
operation may be heard.
Iftheresetneonlights,turntheboilertemperaturecontrol to"0"
(off), wait 30 seconds, then repeat the lighting instructions.
To Turn the Appliance Off
For short periods, turn the boiler temperature control fully anti-
clockwise to “0” (off).
To relight, turn the boiler temperature control to any position
between “0” and “MAX”.
Forlongerperiods,turntheboilertemperaturecontrolfullyanti-
clockwise to “0” (off) and switch off the electrical supply to the
boiler.
To relight follow the lighting sequence given above.
Instructions for Use
Diagram 1
BOILER
TEMPERATURE
CONTROL
10191
"BURNER ON"
NEON
RESET
NEON
"OFF"
POSITION

52000225008D
1 General Data
Important Notice
This boiler is for use only on G20 gas.
Whereverpossible,allmaterials,appliancesandcomponentsto
beusedshallcomplywith the requirements ofapplicableBritish
Standards.
Where no British Standard exists, materials and equipment
should be fit for their purpose and of suitable quality and
workmanship.
Refer to Manual Handling Operations, 1992 Regulations.
Sheet Metal Parts
WARNING. Wheninstallingorservicing this boiler, care should
betakentoavoidanypossibilityofpersonalinjurywhenhandling
the edges of sheet metal parts.
1.1 Technical Data
Refer to diagrams 1.1, 1.2, 1.3 and 1.4.
All dimensions are given in millimetres (except as noted)
.
Approximate weight of complete boiler : 131.5kg (290lb)
Water content : 5.76 litre (1.27gallons)
Gas connection : Rc1/2(1/2in BSPT)
Water connection : Rc1 (1in BSPT)
Electrical supply : 230V~50Hz, fused 3A
Burner : Aeromatic
GENERAL DIMENSIONS - given in millimetres Diagram 1.1
10125
WATER CONNECTIONS
Rc1 (1in. B.S.P.T.)
WATER CONNECTIONS
Rc1 reduced with
DISTRIBUTOR TUBE to
Rc 3/4(3/4in. B.S.P.T.)
(pumped return)
GAS CONNECTION
Rc 1/2(1/2in. B.S.P.T.)
The Seasonal Efficiency Domestic Boilers UK (SEDBUK)
is "D" 78.4%.
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.
1.2 Range Rating
See diagrams 1.2, for boiler ratings.
A
C
D
H
BF
G
E
J
K
L
A B C D E F G H J K L M
387 145 558 294 364 555 442 3 Max 900/ 300 80 32
Min 860
M
NOTE:
The boiler casing can be set at
two heights, MAX. and MIN.
Diagram 1.2
10188
INSIDE DIAMETER OF
ADAPTER FOR 125mm (5in)
NOMINAL DIAMETER FLUE
TO BS567
*
C
L
*

6
2000225008D
1.3 Statutory Requirements
The installation of this appliance must be carried out by a
competentpersonandmustbeinaccordancewiththerelevant
requirements of the current issue of:
Manufacturer’s instructions supplied.
The Gas Safety (Installation and Use) Regulations, Building
Regulations, Local Water Company Bye-laws, The Building
Standards (Scotland) Regulations, (applicable in Scotland),
HealthandSafetyatWorkAct,ControlofSubstancesHazardous
to Health, Electricity at Work Regulations and any applicable
local regulations.
Detailedrecommendationsarecontainedinthecurrentissueof
the following British Standards and Codes of Practice,
BS6891, BS5440 Part 1 and 2, BS6798, BS5449, BS5546,
BS6700, BS7478, BS7593, BS7671.
Manufacturer’s instructions must not be taken as overriding
statutory requirements.
1.4 B.S.I Certification
This boiler is certificated by B.S.I., for safety and performance.
Itis, therefore,important thatno alterationis made to the boiler
unless agreed, in writing, by Halstead Boilers Ltd.
Any alteration not approved by Halstead Boilers Ltd., could
invalidate the B.S.I. certification, boiler warranty and could
infringe the current issue of the Statutory Requirements.
1.5 Gas Supply
The gas installation should be fitted in accordance with the
current issue of BS6891.
The supply from the governed meter must be of adequate size
toprovideasteadyinletworkingpressureof20mbar(8in wg)at
the boiler.
On completion test the gas installation using the pressure drop
method and suitable leak detection fluid, purge in accordance
with the current issue of BS6891.
1.6 Electrical
WARNING. This boiler must be earthed.
The electrical installation must be carried out by a competent
person. All external components shall be of the approved type
and shall be connected in accordance with the current issue of
BS7671 and any local regulations which apply.
Connection of the boiler and any system controls to the mains
supply through an unswitched shuttered socket outlet and 3A
fused 3 pin plug, both to the current issue of BS1363.
Alternatively, a 3A fused double pole isolating switch may be
used, having a minimum double pole contact separation of
3mm, serving only the boiler and system controls.
Heat resistant cable of at least 0.75mm2(24/0.20mm), to the
current issue of BS6500 Table 16, must be used for all
connections within the boiler casing, to the control box, pump
etc.
1.7 Condensate Drain
A plastic drain pipe may need to be fitted to allow discharge of
condensate to a drain.
Condensateshould,ifpossible,bedischargedinto theinternal
householddrainingsystem.Ifthisisnotpractical,dischargecan
be made externally into the household drainage system or a
purposedesignedsoakaway,seesection4.10formoredetails.
BOILER CASING HEIGHT(S) Diagram 1.3
BOILER
CASING
ALTERNATIVE
HEIGHT
POSITIONS
MIN.
MAX.
To
floor
level
FLOOR LEVEL
9922
1 General Data
Diagram 1.4
Diagram 1.5
MINIMUM CLEARANCES
LEVEL WITH WORKTOP
MINIMUM CLEARANCES
UNDER WORKTOP, FIXTURES
9923
407 MIN.
407 MIN.
CUPBOARDS
WORKTOP
9924
10 10
10 10
CUPBOARD
CUPBOARD
10
WORKTOP
OR FIXTURE
BOILER
BOILER
5
MAX.900
MIN. 860
25

72000225008D
1 General Data
1.8 Boiler Location
This boiler is not suitable for outside installation.
The boiler casing can be fitted at two heights. Refer to
diagram 1.3.
The boiler is assembled at the factory with the control box and
heat shield fitted in the lower position.
The boiler must stand on a level floor, conforming with local
authority requirements and building regulations.
The base temperature is within the requirements of the current
issue of BS5258. The boiler may stand on a wooden floor but
ametal baseplate isrequired toprotect plastictiles andsimilar
floor coverings.
Suitable installation clearance needs to be available at the
sidesoftheboilertofacilitatedirectconnectionofpipeworkand
making good around the flue assembly. The actual clearance
required will vary with site conditions.
When the boiler is to be installed level with work surfaces and
the like, minimum clearances should be provided as shown in
diagram 1.4. Work tops which overhang the cupboard sides,
almost in contact with the casing top, require a larger minimum
air gap. Flush sided fixtures require the same overall minimum
space but can have a reduced air gap on one side.
Boilers to be installed under work tops or fixtures, should be
positionedtoprovideminimumclearancesasshownindiagram
1.5. To facilitate minimum clearances it may be necessary to
modify kitchen units and fixtures.
A front access clearance for servicing of 700mm, should be
provided.
Theboilercan be installedwithin a cupboard, referto minimum
ventilation and clearances as shown in diagram 1.6.
If the boiler is to be installed in a cupboard or compartment,
make sure that nothing will obstruct the openings/vents in the
compartment.
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. Detailsofessentialfeaturesofcupboardorcompartment
design are given in the current issue of BS6798.
The boiler may be installed in any room, although particular
attention is drawn to the requirements of BS7671 with respect
to the installation of a boiler in a room containing a bath or
shower. Any electrical switch should be so positioned that it
cannot be touched by a person using the bath or shower. The
electrical provisions of the Building Standards (Scotland)
Regulations apply to such installations in Scotland.
Wheretheinstallationoftheboilerwillbeinanunusuallocation,
special procedures are necessary the current issue of BS6798
gives detailed guidance on this aspect.
1.9 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
must not be fitted in a room where the room thermostat is
located.
Note: For further information, see the current issue of the
Building Regulations, approved document L1, and the
references:
1)GIL 59, 2000: Central heating system specification (CheSS)
and
2) GPG 302, 2001: Controls for domestic central heating
system and hot water. BRECSU.
CUPBOARD MINIMUM
VENTILATION & CLEARANCE Diagram 1.6
DOOR
272cm2FREE AREA
FOR VENTILATION
10mm
10mm
10mm
CUPBOARD CUPBOARD
272cm2FREE AREA
FOR VENTILATION
IMPORTANT
A CLEARANCE OF 10mm IS REQUIRED BETWEEN THE
FRONT OF THE APPLIANCE AND THE FITTED DOOR.
THE VENTILATION SLOTS ON THE FRONT
OF THE APPLIANCE MUST BE KEPT CLEAR.
THE FREE AREA FOR VENTILATION MUST
NOT BE REDUCED IF A GRILLE IS FITTED.

8
2000225008D
Diagram 2.2
FULLY PUMPED SYSTEM
(DIAGRAMMATIC)
2 Water Systems
0870
1 metre
MIN.
27metres
MAX.
PUMP
Heating
Circuit
TO INDIRECT
CYLINDER
22mm VENT
15mm
COLD FEED
Distributor tube in
pumped return
connection
BOILER
C
L
DRAIN OFF
COCK
2.1 Water Pressure Head
Theboilershallonlybeconnectedtoacisternwatersupplywith
a minimum head of 1metre (3ft3in) and a maximum head of
27metres (90ft) which has an open vent in the system.
Theworkingpressuremustbewithintherange0.1barto2.7bar
(1.3 to 39lbftin2).
TheboilerMUST NOT beconnected to asealedwater system.
2.2 Inhibitor
Attention is drawn to the current issue of BS5449 and BS7593
on the use of inhibitors in central heating systems.
If an inhibitor is to be used in the system, contact should be
made with the inhibitor manufacturers so that they can
recommend their most suitable product.
Whenusing in anexisting system takespecial care todrain the
entiresystem,includingtheradiators,thenthoroughlycleanout
before fitting the boiler whether or not adding an inhibitor.
2.3 Gravity Domestic and Pumped Heating
Itisrecommendedthatacylinder thermostat is used to prevent
the stored water temperature becoming unnecessarily high
when the central heating pump is off.
The domestic primary flow and return must be 28mm o.d. The
installation must comply with the current issue of BS5546 and
BS6700, see diagram 2.1.
Iftheaboveconditionscannotbemet,itissuggestedthatafully
pumped system be used.
2.4 Pumped Heating and Hot Water
Where a single flow and return is taken from the boiler, a
minimum static head of 1metre (3ft3in) must be provided
between the water line of the feed tank and the centre of the
waterway, see diagram 2.2.
2.5 Circulation Pump
Normallythepumpshouldbesettogiveatemperaturedifference
of11oC(20oF)acrosstheboiler. Attheappropriatepumpedflow
rate the pressure loss through the boiler can be found from the
graph, diagram 2.3.
Use a pump with integral valves or fit isolating valves as close
to the pump as possible.
2.6. Cylinder
Forall systems supplying domestic hotwater the cylinder must
be indirect.
2.7 Safety Valve
A safety valve need not be fitted to an open vented system.
2.8 Draining Tap
A draining tap must be provided at the lowest points of the
system which will allow the draining of the entire system,
including the boiler and hot water cylinder.
Draining taps should be to the current issue of BS2879.
2.9 Thermostatic Radiator Valves
If thermostatic radiator valves are fitted care must be taken to
ensure that there is an adequate flow rate through the boiler
when they close, refer to the current issue of BS7478 for
guidance. If fitted to all radiators ensure a bypass is fitted and
adjusttoachieveatemperaturedifferencenogreaterthan20oC
between flow and return with the thermostatic valves closed.
Diagram 2.3
1.50
1.25
1.00
0.75
0.50
0.25
0
30
20
10
0
0612 18 24 30 36 42
FLOW RATE (LITRES/MINUTE)
WATER PRESSURE LOSS (metre HEAD OF WATER)
WATER PRESSURE LOSS (INCHES HEAD OF WATER)
60
40
2.00 70
50
1.75
0123456789
FLOW RATE (GALLON/MINUTE)
1074
Diagram 2.1
0869
27metres
Max.
PUMP
Heating
Circuit
INDIRECT
CYLINDER
(Shown with
recommended
thermostat and valve).
22mm VENT
15mm COLD FEED
REFER TO BS 5546
28mm
Distributor tube in
pumped return
connection
BOILER
C
L
DRAIN OFF
COCK

92000225008D
3 Flue andVentilation
Important Notes
The flue must be installed in accordance with the rules in force
in the countries of destination.
The flue must be in accordance with the current issue of
BS5440 Part 1.
The Chimney Flue Adapter Kit (Pt. No. 2000461993) socket is
designed to take flue pipes to the current issue of BS567. If a
fluepipetoBS715istobeused,anadaptermustbefittedtothe
boiler flue socket.
The flue must be at least equivalent to 1m vertical.
The maximum flue length must not exceed 15m vertical.
Due to the Sedbuk D efficiency of the Halstead Buckingham 4
CFF, if the flue length exceeds the following ;
CFF80 - 9m
then provision must be made to ensure that the condensate
products are drained away and that the flue liner is of the
appropriatespecification.Wewouldrecommendthatoneofthe
followingfluelinersshouldbeusedoranequivalentspecification:
Ritevent - Chimflex LW or SB
Selkirk - Selflex TS or TSE
Anexistinglinermustbechangedifthereisanydoubtthatitwill
not operate safely throughout the life of any new appliance.
A drain point is incorporated on the chimney flue adapter to
which a drain pipe can be connected, refer to section 4.10.
3.1 Flue Guidelines
Theflueshouldbekept asshortaspossible. Horizontalorvery
shallow runs of the flue should be avoided as they encourage
local cooling.
Alwayschooseaflueroutewhichwillcausetheleastcoolingof
the flue.
90º elbows should not be used.
The existing flue may not be completely sound. Therefore, to
prevent the possibility of leakage, additional sealing MUST be
carriedout between thebase of the chimney and the flue liner.
Theend of theflue liner at the chimneytop must beadequately
sealed and clamped, using proprietary fittings suitable for the
flue liner used, see diagram 3.1.
The flue should, preferably, end above ridge height but at the
least above the eaves of a pitched roof. Use a certificated
terminal.
Ifthe flueis passedthrough ornear any combustible material it
should be installed in accordance with the current issue of
BS5440 Part 1.3. If in doubt seek advice from the local gas
undertaking or Halstead Boilers Ltd.
3.2 Existing Chimney
An existing brick chimney must be thoroughly swept and all
debris cleared away before lining.
Remove any damper or register plate. Alternatively it may be
locked in the fully open position.
Aflexiblefluelinerispreferredbutarigidlinermaybeused,with
connection to the boiler flue socket made with a short vertical
piece of flexible liner, see diagram 3.2.
Thesealingplate also preventsdebrisfalling and givesthe flue
better insulation, reducing the possibility of condensation, see
diagram 3.1.
Check the system efficiency before installing the boiler.
Diagram 3.1
3.3 New Chimney
A newly built chimney can be lined with a moisture resistant
lining, such as salt glazed pipe, of an appropriate diameter as
specified in the Building Regulations.
In the case of a salt glazed lined flue, it is recommended that a
short vertical length of flue pipe, preferably flexible metallic be
used. Fixandsealittotheboilerfluesocketandmakegoodwith
an approved seal.
If a flue and false chimney breast are to be constructed all
openings for pipework to upper floors etc. must be sealed.
If a specially built compartment is constructed for the boiler, it
must conform to the requirements of the current issue of
BS5440 Part 1 and BS5871.
Diagram 3.2
9915
APPROVED
SEAL
FLEXIBLE
LINER
BOILER
RIGID
FLUE
LINER
9914
SEALING AND
CLAMPING
PLATE
AIR
SPACE
150mm (6in) plug of Mineral Wool or similar
SEALING
PLATE
CHIMNEY
FLUE
ADAPTER
CHIMNEY
FLUE
ADAPTER

10
2000225008D
3.4 Timber Frame Buildings
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 Halstead Boilers Ltd.
3.5 Ventilation for Boiler Installed in a Room
or Space
If the boiler is to be installed in a room or space a purpose
designed permanent ventilation opening, to supply air for
combustion,mustbeprovidedonanoutsidewalltoexternalair,
refer to the current issue of BS5440 Part 2 for details.
The opening may be directly into the room or the space
containing the boiler, or an outside wall of an adjacent room or
space which has an internal permanent air vent, of the same
size, into the room or space containing the boiler.
Do not ventilate through a bedroom, bedsitting room, private
garage or a room containing a bath or shower.
When the boiler is installed in a room or internal space already
containing other fuel burning appliances then the air supply of
such appliances must be taken into account.
Theventilationopeningareasaregivenin“AirVentTable”. The
figures quoted refer to the minimum acceptable effective area.
3.6 Ventilation for Boilers Installed in a
Compartment
When the boiler is fitted in a compartment, high and low level
purpose designed, permanent openings must be provided to
supply air for combustion and compartment ventilation.
Thecupboardcontainingtheboilermusthavethedoorremoved
for ventilation reasons.
Theairventsmusthaveminimumareas,see“CompartmentAir
Vent table". Thefiguresquotedrefertotheminimumacceptable
effective area.
Both the high and low level openings must communicate with
thesameroom,ormustbothbeon the samewalltooutsideair.
If air vent grilles are fitted to a cavity wall, the opening through
the wall must be ducted.
Where ventilation air to a compartment is taken from a room or
space, then the room or space must be fitted with a ventilation
opening as specified in “Air Vent Table”.
For information regarding compartment requirements refer to
the appropriate section of the current issue of BS6798.
3.7 Ventilation for Boilers installed in a
Cupboard
Forminimumventilationandclearancesforcupboardinstallation
refer to section 1.8 and diagram 1.6.
3.8 Extract Fans
Ifanextractfanisfittedinthepremises,thereisapossibilitythat
if adequate inlet openings are not provided, spillage of the
products from the boiler could occur.
When openings are fitted in accordance with the current issue
ofBS5440Part2andthissection,extractfansshouldnotcause
down draught, but where such fan installations are found, a
spillage test must be carried out in accordance with the current
issue of BS5440 Part 1 and any corrective work done.
3 Flue and Installation
FROM
OUTSIDE
COMPARTMENT AIR VENT TABLE
COMPARTMENT
VENTILATION
REQUIREMENTS
VENTILATION
FROM ROOM
OR SPACE
HIGH LEVEL LOW LEVEL
VENT AREA VENT AREA
205cm232in2409cm264in2
103cm216in2205cm232in2
AIR VENT TABLE
FOR ROOM SPACE INSTALLATIONS
104cm2
EFFECTIVE AREA OF VENT
16in2

11 2000225008D
4 Installation
General Installation Notes
The appliance pack contains :-
Boiler.
Casing panels, packed seperately.
Loose items fittings pack, see list in pack.
The chimney flue adapter with flue extension is supplied
seperately.
Before installation of the boiler make sure that the location
selectedis in accordancewith therequirements of Section1.8.
4.1 Unpacking
Theboilercasingpanelsare packedseparatelywithinthemain
carton and are designed to enable gas and water connections
to be made before fitting the casing panels.
The casing brackets, flue restrictor, distributor tube and other
loose items, are in the fittings pack.
IMPORTANT.WithregardstotheManualHandlingOperations,
1992 Regulations, the following operation exceeds the
recommended weight for one man lift.
4.2 Water Connections - Gravity Domestic and
Pumped Heating
Fit suitable fittings into the boiler tappings, see diagram 4.1.
Make sure that all pipes are taken backwards and will clear the
casings.
Heating flow: Any one of the four upper connections may be
used.
Domesticflow: Anyoneofthethreeremainingupperconnections
may be used.
Heating return: The water distributor tube must be fitted into
either of the front lower connections on all installations, see
diagram 4.2. This tube is in the fittings pack.
Domestic return: Any one of the three remaining lower
connections may be used for the gravity domestic hot water
return.
Fit plugs into any unused boiler tappings.
4.3 Water Connections - Fully Pumped
Systems
Fit suitable fittings into the boiler tappings as required, see
diagram4.3. Makesurethatallpipesaretakenbackwardsand
will clear the casings.
It is important that all connections are made as shown in
diagram 4.3.
Fit the water distributor tube into the return connection, see
diagram 4.2. This tube is packed in the fittings pack.
Fit plugs into any unused boiler tappings.
Diagram 4.1
WATER CONNECTIONS - GRAVITY
DOMESTIC, PUMPED HEATING
ALTERNATIVE
HEATING
RETURN
With distributor
tube (not shown)
ALTERNATIVE
HEATING OR
DOMESTIC
HOT WATER
FLOW
GRAVITY
DOMESTIC
RETURN TO
ANY OF THE
3 REMAINING
LOWER CONNECTIONS
9859
DISTRIBUTOR TUBE Diagram 4.2
1277
UPPER
MARKER
DISTRIBUTOR
TUBE
must be in pumped
return connection
UPPER MARKER
must lie between the
outer NOTCHES
Diagram 4.3
WATER CONNECTIONS FULLY
PUMPED SYSTEMS
9859
ALTERNATIVE
FLOW
POSITIONS
ALTERNATIVE
RETURN
POSITIONS
With distributor
tube (not shown)

12
2000225008D
CASING BRACKETS FITTING Diagram 4.6
9858
FRONT
CASING
BRACKET
No.8
SCREW
(4)
CAPTIVE
NUT
UPPER CASING
BRACKET
CAPTIVE
NUT
No.8
SCREW
(4)
Diagram 4.4
PIPEWORK CASING
CLEARANCES
Diagram 4.5
REAR CONNECTION
PIPEWORK (28mm)
9861
FOR MINIMUM
CLEARANCE
9860
4.4 Pipework
When the front tappings are used, it is essential that any
pipework or fittings do not project more than shown in diagram
4.4.
WhenusingareartappingwithRc(1inBSP)fittingfor28mmod
pipework, it is recommended that a short nipple and an Rc
thread(BSP)tocopperelbowisused.Ifthepipeworkisrequired
to run back to the wall, make sure that it will clear the boiler air
ductand,ifworking tominimumclearance,doesnotprojecttoo
far from the boiler, see diagram 4.5.
Donot route anypipework, water or gas, acrossthe front ofthe
combustion chamber cover.
Thegaspipeworkmustbealongthelefthandsideoftheboiler.
4.5 Casing Brackets
Fit the two upper and two front casing brackets shown in
diagram 4.6, using the No.8 screws provided.
NOTE: The screws will already be fitted.
Pushthecaptivenuts,suppliedloose,ontothecasingbrackets
as shown in diagram 4.6.
4 Installation
9863
SIDE CASINGS FITTING Diagram 4.7
MAX.
SIDE
CASING
(R.H.)
MIN.
BOILER
PLINTH
FRONT
CASING
BRACKET
No. 8
SCREW
(4)
LOCATING
SLOTS

13 2000225008D
4.6 Side Casings
Fit the side casings by locating their lugs into the appropriate
slot in the boiler plinth, see diagram 4.7, depending on the
required height, there are two options, see section 1.7.
Secure the casing sides to the front and rear upper casing
brackets with self-tapping screws supplied, see diagrams 4.7
and 4.8.
Note:Ifthesidein-fillpanelsarebeingfittedtheyshouldbefitted
at the same time as the side casing, see next section.
4.7 Side In-fill Panel (if required)
The side in-fill panel is supplied with the boiler, which can be
fittedattherearoftheleftandrighthandsidecasingbutcanbe
discarded if the water connections are made on both sides of
theboilerorif theboilerisscreenedbyfixtures. Thein-fillpanel
will usually be fitted on the side where there are no pipework
connections.
Insert the push fit plastic location peg, supplied, through the in-
fillpanelandsidecasingholes and securewiththespringclips,
see diagram 4.9.
NOTE
The boiler is assembled at the factory with the control box and
heat shield fitted in the lower casing height position.
4 Installation
Diagram 4.10
0886
WING NUT
SELF
TAPPING
SCREWS
(3)
(3) SELF
TAPPING
SCREWS
(for height
adjustment
only)
"LOW"
position
"HIGH"
position
"LOW"
position
"HIGH"
position
Diagram 4.9
PLASTIC
PEG
PLASTIC
PEG
SPRING
CLIP
SIDE
CASING
(R.H.SHOWN)
UPPER VIEW
LOWER VIEW
SPRING
CLIP
SIDE
CASING
(R.H. SHOWN)
IN-FILL
PANEL
IN-FILL
PANEL
Diagram 4.8
SCREW
UPPER
CASING
BRACKET
SIDE CASING
(R.H. SHOWN)

14
2000225008D
Diagram 4.12
FRONT AIR PRESSURE
SWITCH TUBE (CLEAR)
ELECTRICAL
CONNECTORS
REAR AIR PRESSURE
SWITCH TUBE (RED)
4 Installation
4.8 Flue / Boiler Connection
Removethethreeself-tappingscrewsfromthelowerpartofthe
control box support bracket, see diagram 4.10.
Undo the wing nut that secures the top of the heat shield and
carefully hinge down control box and heat shield, see diagram
4.10.
Releasethetogglelatchesthatsecurethefan accessdoorand
remove, see diagram 4.11.
Remove the electrical connections from the fan by pulling the
insulationbootsonlyanddisconnecttheairpressuretubesfrom
the fan taking note of their positions, see diagram 4.12.
Remove the fan assembly from the flue hood by removing the
securing screw, pull forward and lift up to release the 3 hooked
securing lugs underneath the fan, see diagrams 4.12 & 4.13.
From the Chimney Flue Adapter Kit take the flue spigot, the
gasket is supplied in the fittings pack.
Connect the flue spigot and gasket to the top flue outlet of the
boilerusingtheselftappingscrewsprovided,seediagram4.14.
From the Chimney Flue Adapter Kit, take the chimney flue
adapter and remove restrictor securing screw, select and fit
appropriate restrictor :
Marked 'C'
then secure in place with the previously removed screw. To
connect a condensate drain, remove plastic end stop by
depressing the collet.
Slide the Chimney Flue Adapter into the flue spigot until it
engagesinthebayonetconnection,thentwistclockwisetolock,
see diagram 4.14.
Rest theflueductextensiononthesupportbracketandengage
into the chimney flue adapter, see diagram 4.15. Refit fan
ensuring it is engaged into the flue duct extension and the
securing lugs are located correctly into the flue hood, secure
withfansecuringscrew.Replaceelectricalconnectionsandair
pressure tubes.
The polarity of the electrical connections is not important.
Make sure that the air pressure tubes are fitted as before, see
diagram 4.12 and that the fan duct engages fully into the flue
duct extension piece.
IMPORTANT.WithregardstotheManualHandlingOperations,
1992 Regulations, the following operation exceeds the
recommended weight for one man lift.
Placetheboilerinpositiontakingcarenottodamagethecasing
panels.
Flue Connection
NOTE: Fix and seal the flue to the hood of the chimney flue
adapter in accordance with normal practice.
The flue should be 125mm (5in) nominal diameter, refer to
section 3.
Diagram 4.13
SECURING
LUGS
Diagram 4.11
TOGGLE
LATCHES
FAN
ACCESS
DOOR
AIR
PRESSURE
TUBE (RED)
10259
FAN
SECURING
SCREW

15 2000225008D
4.9 Water & Gas connections
Replace fan access door, heat shield and control box.
Note: When replacing the fan access door make sure the lip at
thetopofdoorfits intoandbehindtheslottedbracketlocatedat
the top of the boiler.
As there are two casing height options, the control box height
and the heat shield may have to be adjusted to suit your
requirements.
Complete the water connections to the boiler.
Fill, vent and flush the system.
Check for any water leaks and put right.
Make the gas connection to the service cock, at the lower left
hand side of the boiler, see diagram 1.1.
Thewholeofthegasinstallation,includingthemeter,shouldbe
inspected,testedforsoundnessandpurgedinaccordancewith
the current issue of BS6891.
4.10 Condensate Drain Connection
(If Applicable)
WithreferencetoSection3,shouldyourfluebegreaterthanthe
"Dry" flue length stated, then a condensation drain should be
fitted.
To use the condensate drain connection on the chimney flue
adapter, remove the end stop, see diagram 4.14. A 22mm
plastic overflow pipe should be used to fit on to the drain
connectionanddischargetoadrain.Thedrainpipeshouldhave
afallofatleast2.5°awayfromtheboilerandshouldincorporate
a 'U' trap.
Condensateshould,ifpossiblebedischargedintothehousehold
internal drainage system. If this is not practicable, discharge
can be allowed into the external household drains or by a
purpose designed soak away.
Itisrecommendedthatanyexternalcondensatedrainisinsulated
and also preferably of 32mm diameter, to prevent freezing in
adverse weather conditions.
4 Installation
Diagram 4.16
TOP CASING
9865
SCREW (2)
PLASTIC
PEG (2)
CHIMNEY
FLUE
ADAPTER
Diagram 4.14
FLUE
SPIGOT
RESTRICTOR
SECURING SCREW RESTRICTOR
END STOP
Diagram 4.15
FLUE DUCT
EXTENSION
PIECE
SUPPORT
BRACKET
4.11 Top Casing
Refer to diagram 4.16.
Fit two plastic pegs, one on each side, in the holes on the top
casing.Theplasticpegsareatightfitandarebestpushedhome
with a flat faced tool.
Secure front of top casing with the two screws provided.
11341
SECURING
SCREW
CHIMNEY
FLUE
ADAPTER
FLUE HOOD
11339

16
2000225008D
5 ElectricalWiring
MAINS INLET
CONNECTOR Diagram 5.2
CABLE
CLAMP
SCREW
5.1 Control Box Access
Removecontrolboxcoverby undoingthefoursecuringscrews
(two on control box, two on the heat shield) and lift off, see
diagram 5.1.
5.2 Electrical Connections
WARNING. This boiler must be earthed.
Take care not to damage any internal wiring.
Using heat resistant (85oC) cable of at least 0.75mm2(24/
0.2mm)andofasuitablelength,routeasshownindiagram5.3.
Thread through the grommet at the bottom rear of the control
box, through the cable clamp and connect to appropriate
terminals. Tighten cable clamp screws, see diagram 5.2.
Standard colours are, brown - live (L), blue - neutral (N) and
green/yellow - earth .
The mains cable outer insulation must not be cut back external
to the cable clamp.
Make sure the cable is suitably secured.
When making connections make sure that the earth conductor
ismadeofagreaterlength thanthecurrentcarryingconductors,
so that if the cable is strained the earth conductor would be the
last to become disconnected.
5.3 Pump Connection
The pump must be connected to the external controls.
5.4 Testing - Electrical
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 earth 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 of the controls scheme used with the boiler.
Replace the control box cover. Diagram 5.3
CABLE
CLAMP
CABLE
CLIPS
CABLE
CLIPS
HEAT RESISTANT
CABLE
bk
CONTROL
BOX
COVER
CONTROL
BOX
SECURING
SCREWS
BOILER
TEMPERATURE
CONTROL
Diagram 5.1
9905
TERMINAL BLOCK CONNECTIONS
TERMINAL
BLOCK

17 2000225008D
6 Commissioning
IMPORTANT NOTE
TheWARNINGNOTICE attached to thefrontcasing
must only
be removed by the user.
Please ensure the “Benchmark” logbook is completed and left
with the user, and the magnetic lighting instruction label is
placed on the surface of the boiler casing.
6.1 All Systems
Commissioningshouldbecarriedoutbyacompetentpersonin
accordance with the current issue of BS6798.
UNDER ALL CIRCUMTANCES the case must be correctly
fitted and sealed, unless fault finding.
Makesurethatthesystemhasbeenthoroughlyflushedoutwith
cold water without the pump in place.
Refit the pump, fill the system with water, ensuring that all the
air is properly vented from the system and pump.
6.2 Initial Lighting and Testing
CAUTION. This work must be carried out by a competent
person, in accordance with the current issue of BS6798.
Makesurethatallnakedlightsandcigarettesareextinguished.
Refer to ‘Instructions for Use’ and identify the controls.
Check that the boiler is isolated from the electrical supply.
Turn the gas service cock “On” , see diagram 6.1.
Purge in accordance with the current issue of BS6891.
WARNING. The multifunctional control and fan operate on
mains voltage, terminals will become live.
If programmer control is fitted, make sure it is in the ON mode.
Make sure that any remote controls are calling for heat.
Diagram 6.1
BOILER COMPONENTS
10052
A CONTROL BOX
B PHIAL POCKET
C GAS SERVICE COCK
D "BURNER ON" NEON
E RESET NEON
F TEMPERATURE CONTROL
G BURNER PRESSURE TEST POINT
H GAS PRESSURE ADJUSTMENT SCREW
J DATA LABEL
E
D
A
G
Turn the boiler temperature control clockwise to “Max”.
The ignition system will operate to light the boiler. After a pre-
set time if ignition has not taken place the boiler will shutdown.
To re-start the lighting sequence, turn the boiler temperature
control to “O”, then fully clockwise to “Max”.
"Max" is approximately 82°C (180°F).
Aftertheburnerhaslit,the“Burneron”neononthecontrolpanel
will come on.
Isolate the boiler from the electrical supply.
Loosen the burner pressure test point screw and connect a
suitable pressure gauge, see diagram 6.1.
Switch on the electrical supply to the boiler.
WARNING. The multifunctional control and fan operate on
mains voltage, terminals will become live.
6.3 Testing - Electrical
Turn the boiler temperature control fully clockwise to the
maximum setting.
The lighting sequence is automatic as follows:
The fan operates and after a short period of time, the spark
ignition operates, the solenoid opens, then the burner will light
shownbythe“BurnerOn”neononthecontrolpanellightingup.
The burner will remain alight until switched off, either by the
boilertemperaturecontrol,programmer(if fitted) or any remote
system control.
To make sure that the flame supervision device is working
correctly the following should be done.
With the burner alight, turn the gas service cock “Off”, see
diagram 6.1.
After a short period the burner will go out.
F
B
C
H
A
J

18
2000225008D
6 Commissioning
The correct working of the flame supervision is shown by the
“Burner On” neon going out and the ignition sequence starting
up.
After a short period the boiler will shut down.
If the lighting sequence described fails, refer to fault finding
section 9.
To carry on turn the gas service cock “On”, see diagram 6.1.
To re-start the lighting sequence, turn the burner temperature
control to “0” then fully clockwise to “Max.”.
During normal operation when the boiler switches “Off”, the
burner will go out. The automatic lighting sequence will work
again when heat is required.
Iftheresetneonlights,turntheboilertemperaturecontrolto"0"
(off), wait 30 seconds, then repeat the lighting instructions.
6.4 Testing - Gas
With the boiler on proceed as follows:
Test for gas soundness around the boiler gas components
using a suitable leak detection fluid, in accordance with the
current issue of BS6891.
Check the burner gas pressure at least 10 minutes after boiler
has lit, refer to Data Label, see diagrams 1.2, 1.3 & 1.4.
If necessary adjust the gas pressure to obtain the required
setting turning screw clockwise, to decrease pressure, see
diagram 6.1.
Should any doubt exist about the gas rate, check it using the
gasmeter test dial and stopwatch at least 10 minutesafter the
burnerhaslit,makingsurethatallothergasburningappliances
and pilot lights are off.
The gas rates: Buckingham 4 80C FF : 2.8m3/h (87ft3/h)
is for guidance only, dependent on the heat setting.
Turn the boiler temperature control fully anti-clockwise to “0”.
Isolate from the electrical supply.
Removethepressuregaugefromthetestpointandrefitscrew,
making sure a gas tight seal is made.
Whentheboilertemperaturecontrolisturnedtothe“0”position,
by hand, wait at least 30 seconds before turning On again.
Theremaybeaninitialsmellgivenofffromtheboilerwhennew,
this is quite normal and it will disappear after a short period of
time.
6.5 Testing - All Water Systems
Allow the system to reach maximum working temperature and
examine for water leaks.
There should be no undue noise in the system.
Theboilershouldthenbeturnedoffandthesystemdrainedoff
as rapidly as possible,whilst still hot.
Refill system.
6.6 Open Vented System
Ensure there is no pumping over of water or entry of air at the
open vent above the feed and expansion cistern.
6.7 Adjustment - Fully Pumped Open Vented
System
Whencommissioningthesystemtheboilershould firstbefired
on full service, that is, central heating and domestic hot water.
Adjustthepumptothesystemdesignsetting,thenbalancethe
system, making adjustments as necessary.
6.8 Completion
Adjust the boiler temperature control and any system controls
to their required settings.
Fit the bottom plinth panel and secure with two dog point
screws, see diagram 6.2.
Finally fit the front panel by hooking under front of top panel
locating on the two studs and securing at the bottom on to the
bottom plinth panel with two screws, see diagram 6.3.
Diagram 6.2
LOCATING
STUDS
LOCATE
UNDER LIP
FRONT
PANEL
Diagram 6.3
FRONT PANEL
SECURING SCREWS
BOTTOM PLINTH
PANEL
SECURING SCREWS

19 2000225008D
7 Instructions to the User
Instruct and demonstrate the safe and efficient operation of the boiler, heating system and domestic hot water system.
Advise the user, that to ensure the continued efficient and safe operation of the boiler, it is recommended that it is checked and
serviced at regular intervals. The frequency of servicing will depend upon the particular installation and usage, but in general once
a year should be enough.
Draw attention, if applicable to the current issue of the Gas Safety (Installation and Use) Regulations, Section 35, which imposes
a duty of care on all persons who let out any property containing a gas appliance.
It is the Law that servicing is carried out by a competent person.
Advisetheuseroftheprecautionsnecessarytopreventdamagetothesystemandbuildingintheeventoftheheating system being
out of use during frost and freezing conditions.
Reminder - Leave these instructions and the “Benchmark” logbook with the user.
8 Servicing
REMEMBER,Whenreplacingapartonthisappliance,useonly
spare parts that you can be assured conform to the safety and
performance specification that we require. Do not use
reconditionedorcopypartsthathavenotbeenclearlyauthorised
by Halstead Boilers Ltd.
Products of Combustion Check
Note: To obtain a products of combustion reading, remove the
front panel and remove the control box as descibed in the
relevantparagraphsofsection4.8. Next,removethecapfrom
thesamplingpoint,locatedonthetopofthelefthandsideofthe
inner casing, see diagram 8.1.
Connect the analyser tube on to the nipple.
WARNING. The multifunctional control and fan operate on
mains voltage, terminals will become live.
Switchontheelectricalsupplyandgassupplythenoperate the
boiler.
Oncompletionofthetestswitchofftheelectricalsupplyandgas
supply, remove analyser tube and replace sampling point cap.
Servicing
Beforeservicingturnoffthegasandisolatetheelectricalsupply
to the boiler.
Aftercompletingaservicealwaystestforgassoundness,make
electrical checks and carry out functional check on controls.
Unless stated otherwise all parts are replaced in the reverse
order to removal.
Diagram 8.2
GAS
SERVICE
COCK
UNION
ELECTRICAL
PLUG
Diagram 8.1
SAMPLE POINT
SECURING
SCREW
Diagram 8.3
ELECTRICAL
WIRE
RETAINING
CLIPS
CONTROL BOX
SUPPORT
BRACKET

20
2000225008D
8 Servicing
8.1 Access
Remove the boiler front casing panel, refer to section 6.8.
Remove the bottom plinth panel by unscrewing the two dog
pointscrewssecuringthepaneltotheboilerplinth,seediagram
8.4.
Disconnect gas valve from gas cock and unplug electrical plug
from gas valve, firstly removing electrical plug securing screw,
see diagram 8.2.
Unclip electrical wires from control box support bracket, see
diagram 8.3.
Undo the four self-tapping screws that secure the combustion
chamberfrontandcarefullywithdrawittogetherwiththeburner
and gas valve assembly, taking care not to strain the ignition
and earth wire, see diagram 8.5.
Note: When replacing burner in combustion chamber make
sure it fits correctly on the guides.
Disconnect the ignition and earth leads from the burner and
removebydrawingtheleadsthoughthegrommet,seediagram
8.5.
Removethethreeself-tappingscrewsfromthelowerpartofthe
control box support bracket, see diagram 8.6.
Undo the wing nut that secures the top of the heat shield and
carefully hinge down control box and heat shield, see diagram
8.6.
Releasethetwo toggle latchesthat secure the fanaccess door
and remove, see diagram 8.7.
Note: When replacing the fan access door make sure the lip at
thetopofdoorfits intoandbehindtheslottedbracketlocatedat
the top of the boiler.
Remove the electrical connections from the fan by pulling the
insulation boots only.
Disconnect the two silicone tubes from the fan taking note of
their positions.
Note: To ease removal of the right hand baffle from the heat
exchanger, remove both silicone tubes from the air pressure
switch.
Remove fan securing screw, electrical connections and air
pressure tubes, then remove fan and flue hood by sliding back
to disengage the retaining lugs then lift up.
Remove the flue hood.
When replacing the flue hood ensure that it rests on the guides
and that the rear of flue hood is located under the pegs at the
rear and pushed down and back fully.
IMPORTANT: When re-fitting fan check that it fits fully into the
flue duct extension piece.
Diagram 8.4
BOTTOM PLINTH
PANEL
SECURING SCREWS
Diagram 8.5
COMBUSTION
CHAMBER
COVER
IGNITION AND
EARTH LEADS
GROMMET