Glowworm SwiftFlow 125 User manual

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221474C.02.00
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]
Instructions for Use
Installation and Servicing
Tobeleftwiththeuser
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.
This is a Cat I2H Appliance
Fanned Flue Combination Boiler
G.C. No. 47 313 19
125 electronic
❑
✔
❑
✔
❑
✔
All replacement parts
All labour charges
All call-out charges
Guarantee Registration
REGISTER YOUR GLOW-WORM APPLIANCE
FOR 1ST YEAR GUARANTEE PROTECTION
CALL 0181 380 2555
6505
125
Thank you for installing a new Glow-worm appliance in your home.
Glow-worm appliances' are manufactured to the very highest standard so we are pleased 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:

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221474C
Introduction 3
Clock Settings 4
Lighting the Boiler 5
General Data 1 7
Boiler Position 2 9
Flue and Ventilation 3 10
Heating System 4 12
Domestic Hot Water System 5 13
Appliance and Flue Preparation 6 14
Flue Preparation 7 16
Gas and Water Connections 8 18
Electrical Connections 9 19
Boiler Fixing 10 20
Commissioning 11 22
General Data 1 26
Servicing 2 27
Fault Finding 3 30
Replacement Parts 4 37
Spare Parts 5 48
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
tomeettherequirements ofDirective 92/42/EECon theefficiency requirementsfor newhot waterboilers firedwith liquidor gaseous
fuels.
Type test for purposes of Regulation 5 certified by: Notified body 0087.
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.
Substances Hazardous to Health
The adhesives and sealants used in this appliance are cured and give no known hazard in this state.
INSULATION PADS/CERAMIC FIBRE, GLASSYARN, MINERAL WOOL
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 to the eyes or severe irritation to the skin seek medical attention.
Important Information
CONTENTS DESCRIPTION SECTION PAGE No.
INSTRUCTIONS
FOR USE
INSTALLATION
INSTRUCTIONS
SERVICING
INSTRUCTIONS

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3221474C
Clock / Timer
Digital
timer Electro /
mechanical
clock / timer
6509
Introduction
Pleasereadtheseinstructionsandfollowthemcarefullyforthesafe
and economical use of your Combination boiler.
This boiler must have been installed by a competent person in
accordance with the rules in force in the countries of destination.
Once the pilot has been lit and the controls set, the boiler is
automatic in operation.
TheSwift-flowcombinationboilerisabletoprovideroomheatingas
partof a central heating system and domestic hotwater direct from
the cold water supply, without the need for secondary storage.
The boiler can be fitted with one of two makes of clock, which look
like this:-
IMPORTANT NOTICE:
This boiler is for use only on G20 gas.
Gas Leak or Fault
If a gas leak or fault exists or is suspected, turn the boiler off and
consult your local gas company or your local installation/servicing
company.
Domestic Hot Water Temperature
NOTE. The mains water temperature in the winter is lower than in
the summer.
The nominal temperature setting for the Domestic Hot Water is
600C (1400F) at a flow rate of 5litre per minute (1.1gal/min)
The specific water rate is 16.8litre per minute based on a 300C
temperature rise.
The water temperature can be increased or reduced by adjusting
the flow rate at the hot water draw off tap.
Boilers Installed in Compartments
Ifthe boilerhasbeenfitted intoa compartmentorcupboard, donot
obstruct the compartment air supply vents.
Do not use the compartment for storage.
Electrical Supply
WARNING. The boiler must be earthed.
The boiler must be connected to a 230V~50Hz permanent supply.
Connection of the whole electrical system of the boiler and any
heating system controls to the electrical supply, must be through
one common isolator.
Isolationshouldpreferablybebyadoublepoleswitchedfusedspur
box. Thefusedspurboxshouldbereadilyaccessibleandpreferably
adjacent to the appliance.
It should be identified as to its use.
Afused threepinplugandshutteredsocketoutlet maybeused
instead of the fused spur box.
PVC flexible cable must be used within the boiler casing to
connect to the boiler.
The 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:
Thecablecolouredbluemustbeconnectedtotheplugterminal
marked “N” or “Black”.
The cable coloured brown must be connected to the plug
terminal marked “L” or “Red”.
Thecablecolouredgreen and yellow must be connectedtothe
plug terminal marked “E” or “Green” or the earth symbol
.
Electrical Supply Failure
The boiler will not work without an electrical supply.
Normaloperationoftheboilershouldresumewhentheelectrical
supply is restored.
Note. Theboiler safety cutoff mayhave operated, pleaserefer
to the following section to reset.
Resetanyexternal controls, toresumenormal operation ofthe
central heating.
Thedigitaltimer,hasalithiumbatterybackupandwillnotneed
resetting.
Boiler Safety Cutoff Reset Button
Theboilerisfittedwithasafetycutoffdevicetopreventdamage
through overheating.
Should the main burner go out during a demand the red neon
on the Reset Button will light.
In certain circumstances the red neon light may not come on,
duetonosystemdemand. Itissuggestedthatahotwaterdraw
off tap be opened to create a demand, the neon should then
come on.
Allow the boiler and system to cool down waiting at least a
minimum of four minutes before pressing the Reset button.
If the problem persists, turn the boiler off and consult the local
gas company or your installation/servicing company.
Instructions for Use

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Setting Timed Programmes
With the clock set to the correct time, see SETTING THE CLOCK
paragraphs 1-4, and then continue as follows:
1. Set RUN switch to P , the display will
indicate the 1st (ON) preset programme and the
symbol .
2. Set day of week to be programmed by pressing the
DAY button.
Note. The days can be selected individually or
as groups:
Mon-Fri., Mon-Sat., Mon-Sun., Sat/Sun.
An arrow will be displayed under the day or
days selected.
3. Set time of day by pressing the buttons
HR and MIN.
4. Press button P to confirm programmes, the
display will indicate the 2nd (OFF) preset
programme and subsequently, 3rd, 4th, 5th, 6th.
7th, 8th.
5. Repeat procedures 2, 3 and 4 until desired
programmes are set.
Note. It is not a requirement to use the 8 on/off
programmes.
6. Set the RUN switch the central position, your
appliance will now operate at the
programmed times.
General Notes.
With the AUTO switch in the I position the central
heating will operated constantly ON.
With the AUTO switch in the O position the central
heating will not operate.
Soft Override button indicated by the
symbol , this function will override the
current central heating programme for the
next available.
ON time programmes are indicated by the
symbol .
Setting Instructions for Electro/mechanical
Clock - if fitted
This clock has a twenty four hour dial, that is, 1pm is 13.
To set the time, turn the whole face clockwise until the pointer is
against the time of day.
To set any “Off” time, push the tappets outwards.
To set any “On” time, push the tappets inwards.
Time can be set either “On” or “Off” in fifteen minute segments.
Note. The clock supplied could be fitted with an override device,
see diagram 1, which switches the clock programme “On” or “Off”
permanently.
The switch will need to be repositioned to resume programmed
working.
Setting Instructions for the 7 Day Digital
Clock/Timer
This is a 24 hour clock/timer, that is 1pm is 13:00, and has 8 “ON”
and 8 “OFF” daily switching actions.
Itisfittedwithalithiumbatterybackupwhichprotectstheprogramme
in the event of an electrical failure. The battery should have a life
of several years.
Diagram 2
5673
AUTO RUN
MT WThFSSu
P
DAY HR MIN
P
R
I
0
I
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
10
11
Diagram 1
OVERRIDE
SWITCH
POINTER
TAPPETS
CLOCK FACE
CONSTANT OFF
PROGRAMMED
CONSTANT ON
0
I
4956
MON/FRI
ON - 06:30
OFF - 08:30
ON - 16:30
OFF - 22:30
SAT/SUN
ON - 07:00
OFF - 09:00
ON - 16:00
OFF - 23:00
Setting the Clock
1. With both AUTO and RUN switches set to the central position,
press R reset button, the display will flash.
2. Set RUN switch to .
3. Set day of week by pressing button DAY.
4. Set time of day by pressing buttons HR and MIN.
5. Set RUN switch to the central position, colon will flash, this
indicates the clock is set.
With the clock set, the factory preset programme shown below will
operate.
Instructions for Use

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User Indicator Lights
Identify the lights be reference to diagram 3.
The Orange - Mains light - shows that the electrical supply to the
boiler is on.
The Green - Running light - shows that the boiler is working
normally, in either the central heating or hot water modes.
If the Red - Low Central Heating water pressure light flashes
continually it is warning of a loss of pressure in the central heating
system.
Duringthistimethe red light will continuetoflash and the boiler will
not work.
IfthishappensyouMUSTcallyourinstallationorservicingcompany.
To Operate the Boiler
1. Checkthatallfiveisolatingvalves are open, the slots in linewith
the length of the valve, see diagram 4.
2. Open the door, by pushing at the side opposite to the hinge.
3. CAUTION. A sealed pressurised system must be filled and
pressurised by a competent person.
Onlyoperatetheboilerwhenyouaresurethatthesystemhasbeen
filledandpressurised. Checkthisbylookingatthepressuregauge
“A”, diagram 3, it should read 0.7bar minimum.
4. Checkresetbutton neon, refer topreviousinstructions on page
3.
5. Open a hot water tap, check that water flows, then close it.
6. If you are in any doubt about the boiler being filled with water
contactyourinstallation/servicingcompanyorthelocalgascompany.
7. CheckthattheelectricalsupplytotheboilerisONattheexternal
isolator.
8. Set switch “C”, clock/timer (if fitted) and any remote controls as
required.
Close the door.
Incertain circumstances, a surge in water pressure may cause the
appliancetooperatemomentarily,thiswillbeindicatedbythepump
starting and the fan speed increasing. This is quite normal.
Central Heating Selector Switch
For central heating set switch “C” to “On” as shown in diagram 3.
The main burner will light to provide central heating.
Note, when the central heating is also controlled by a room
thermostat,clock/timer orotherremotecontrol thesecontrolsmust
be calling for heat for the boiler to operate.
Theusercentralheatingtemperaturecontrolenablesyoutocontrol
the temperature of the central heating water. The knob can be set
between Minimum, about 55OC and Maximum, about 80OC.
If a hot water tap is opened while the boiler is on for heating, the
burner flame will increase in size and priority will be given to hot
water. Whenthehotwatertapisclosed,themainburnerflameswill
decreaseinsizebutwillremainalightuntiltheboilercontrolsorany
heating controls switch it off.
For domestic hot water only, set switch “C” to “Off”, as shown in
diagram 3.
The main burner will then light when any domestic hot water tap is
opened and go out when the tap is closed.
Which ever position switch “C” is in domestic hot water will be
available.
To Turn the Central Heating Off
To turn the heating off for short periods, set switch “C” to “Off” as
shownindiagram3andmake sure all the domestic hot waterdraw
off taps are closed.
Set switch “C” to “On” as shown in diagram 3 to turn the central
heating on again..
To Turn the Boiler Off
To turn the boiler off, isolate the boiler from the electrical supply.
To turn on again following the operating instructions.
Domestic Hot Water Temperature
NOTE. The mains water temperature in the winter is lower than in
the summer.
The water temperature can be increased or reduced by adjusting
the flow rate at the hot water draw off.
Maintenance and Servicing
Toensurethecontinuedefficientandsafeoperationoftheappliance
it is recommended that it is checked and serviced as necessary at
regular intervals. The frequency of servicing will depend upon 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 of
care imposed on the owner of the property by the current issue of
the Gas Safety (Installation and Use) Regulations, Section 35.
Servicing/maintenance should be carried out by a competent
person in accordance with the rules in force in the countries of
destination.
To obtain service, please call your installer or Heatcall (Glow-
worm’s own service organisation) using the telephone number
behind the controls access door, see diagram 3.
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 boiler
Logbook. You can check your installer is CORGI registered by
calling CORGI direct on :- 01256 372300.
Clearances
The boiler requires a clearance in front, below and at the sides of
the casing for safety, servicing and maintenance access, see
diagram 5.
Protection Against Freezing
If the boiler is to be out of use for any long periods during severe
weather, it is recommended that the whole system, including the
combination boiler, should be drained to avoid the risk of freezing.
If in doubt, contact you installation/servicing company for advice.
Draining and Filling
CAUTION. This boiler works in a pressurised system which must
only be drained, refilled and pressurised by a competent person.
Note: If the pressure gauge indicates a loss of system pressure,
thatis,lessthan0.7bar,YOUMUSTCONTACTYOURINSTALLER.
Instructions for Use

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Diagram 4
WATER VALVES
SLOT(OPEN) DRAIN
POINT
COLD WATER
SUPPLY IN
HEATING
FLOW GAS
SERVICE
COCK
HEATING
RETURN
2793
HOT
WATER
OUT
SAFETY
VALVE
DISCHARGE
SLOT(OPEN)
Pressure Relief Safety Valve
CAUTION. A pressure relief safety valve and discharge pipe is
fitted to the boiler. This valve must not be touched. Should there
be any discharge from the pipe, turn the boiler off, isolate from the
electrical supply and contact your installation/servicing company.
Cleaning
WARNING. Thisappliancecontainsmetalparts(components)and
care should be taken when handling and cleaning with particular
regard to edges.
Theboiler casing canbe cleaned usinga mild liquiddetergent with
a damp cloth, then a dry cloth to polish.
Do not use any form of abrasive or solvent cleaner as you may
damage the paint work
Boiler Casing
CAUTION. Do not remove or adjust the casing in any way, as
incorrectfittingmayresultinincorrectoperationorfailuretooperate
at all. If in doubt seek advice from the local gas company or your
installation/ servicing company.
Replacement Parts
If replacement parts are required apply to your local supplier or
British Gas.
Please quote the name of the appliance.
Instructions for Use
✽Increase to 25mm clearance from
combustible material
0183M
✽5
800
✽5
55
140
150
✽5
Diagram 5
125
ele
Diagram 3
6504
Orange Light 'MAINS'
Green Light 'RUNNING'
Red Light 'LOW C.H. WATER
PRESSURE'
5044
SWITCH
'ON'
CONTROL
RESET
BUTTON
SWITCH
'OFF'
PRESSURE GAUGE
‘A’
CENTRAL HEATING
SELECTOR SWITCH
'C'

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1.1 Important Notice
This boiler is for use only on natural gas (G20).
1.2 Sheet Metal Parts
WARNING. When installing the boiler, care should be taken to
avoid any possibility of injury when handling sheet metal parts.
1.3 Notes for Information
The instructions consist of three parts, Installation, Servicing and
Instructions for Use, which includes the Guarantee Registration
Card. The instructions are an integral part of the appliance and
must be handed to the user on completion of the installation.
Materials and equipment should be fit for their purpose and of
suitable quality and workmanship.
1.4 Statutory Requirements
The installation of the boiler must be carried out by a competent
personinaccordancewiththerelevantrequirementsofthecurrent
issue of:-
Manufacturer’s instructions, supplied.
The Gas Safety (Installation and Use) Regulations, The Building
Regulations, The Local Water Company Byelaws, The Building
Standards (Scotland) Regulations (applicable in Scotland), The
Health and Safety at Work Act, Control of Substances Hazardous
to Health (COSHH), The Electricity at Work Regulations and any
local regulations which may apply.
Detailedrecommendationsarecontainedinthecurrentissueofthe
following British Standards and Codes of Practice:-
BS5440Part1and2,BS6798,BS5449,BS6700,BS5546, BS6891,
BS4814, BS7074 Part 1 and 2, BS7478, BS7593, BS7671.
Manufacturer’sinstructionsmustnotbetakenasoverridingstatutory
requirements.
1.5 Data Label
The data label is on the inner case cover.
1.6 Data
See Tables 1 and 2.
All dimensions are given in millimetres
(except as noted).
1.7 Gas Supply
Thegas installationmustbeinaccordancewith therulesinforcein
the countries of destination.
Thesupply from thegoverned gas metermust be ofadequate size
toprovideasteadyinletworkingpressureof20mbar(8inwg)atthe
boiler.
1.8 Electrical Supply
WARNING: The boiler must be earthed.
Theinstallation must be in accordancewith the rules in force in the
countries of destination.
All system components shall be of an approved type.
Connection of the whole electrical system of the boiler and any
heating system controls to the electrical supply, must be through
one common isolator.
Isolation should preferably be by a double pole switched 3A fused
spur box, with a minimum separation of 3mm in both poles. The
fusedspurboxshouldbereadilyaccessibleandpreferablyadjacent
to the appliance. It should be identified as to its use.
Afused 3A three pin plug and shuttered socketoutlet may be used
instead of the fused spur box, provided that they are not used in a
room containing a fixed bath or shower.
Diagram 1.1
ALL DIMENSIONS IN MILLIMETRES
Rc 1/2(1/2in. BSPT)
GAS CONNECTION
22 mm COMPRESSION
CENTRAL HEATING
15 mm COMPRESSION
DOMESTIC WATER
KEY:
48
114
168 331 450
25
2.5
107
66
783
107 66
130
70
6514
1 General Data

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1 General Data
NOMINAL kW 39.2 26.2 10.2
HEAT
INPUT(NET)
NOMINAL kW 35.2 23.5 8.8
HEAT
OUTPUT
BURNER mbar 16.8 8.0 1.2
PRESSURE
APPROX. m3/h 4.1 2.8 1.0
GAS RATE
16
17
13
4
2
5
6
18
15
14
10
11 987
13
19
20
21
12
Diagram 1.2
KEY
1 - Heat Exchanger
2 - Main Burner
3 - Ignition Electrode
4 - Automatic Air Vent
5 - Expansion Vessel
6 - Pump
7 - D.H.W. Hot Outlet
8 - C.H. Return
9 - Gas Supply
10- C.H. Flow
11- D.H.W. Cold Inlet
12- Safety Valve
●Ball valves are fitted in water and gas connections, plus a drain point on all water connections.
✽D.H.W 0.6 to 10bar
working pressure (8.70 to 188lbf/in2)
■ Maximum Heating 119 litres
system water (26.2 gallons) with
content using a cold fill pressure
fitted expansion vessel. of 0.7bar
Domestic hot water
flow rate for a
temperature rise of: 300C 16.8 litres/min.(3.7 gals)
350C14.4 litres/min.(3.17 gals)
Electrical supply 230V~50Hz
Electrical rating 130W
Internal Fuse rating: Fuse 1 Type 2AT
Fuse 2 Type 3.15AT
Lift Weight 39.0 kg (85.98 lb)
Total Weight 52.8 kg (116.40 lb)
●Gas connection Rc1/2(
1/2in BSPT)
●Heating and return 22mm compression
●Domestic hot water 15mm compression
Safety valve Preset 3bar (43.5lbf/in2)
Safety valve discharge 15mm copper
Water content 1.74 litres (0.38 gallon)
■Expansion vessel capacity 8 litres (1.76 gallons)
Heating cold fill 0.7bar
pressure minimum (10.1lbf/in2)
TABLE 2
✽Boiler starts at an inlet pressure of 0.6bar but requires 0.8bar for maximum output.
■For larger systems use an additional expansion vessel, see Section 4.
TABLE 1 D.H.W Max C.H. Max MIN
13- Safety Valve Discharge
14- Water Throttle
15- Mini Expansion Vessel
16- Flow Sensor
17- Multi-Functional Control
incorporating Gas/Air
Ratio Unit
18- Pressure Switch-Water
19- Venturi
20- Flue Collector
21- Pressure Sensing Probe
FACTORY PRESET TO 17.6 kW
FACTORY PRESET TO 2.7 mbar
p
6367

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2.1 Boiler Position
Theboilermust be installedinaccordance with therulesin force of
the countries of destination.
The boiler is not suitable for outside installation.
Anyelectricalswitchorboilercontrolusingmainselectricitymustbe
positioned so that it cannot be touched by a person using a bath or
shower.
Theboilermustbemountedonaflatwallwhichissufficientlyrobust
to take its weight, refer to Table 2.
If the boiler is to be fitted into a cupboard, compartment or unusual
location, special procedures are necessary.
Makesurethatthecupboardorcompartmentairventsarepositioned
to be clear of obstructions at all times, refer to Section 3.7.
2.2 Clearances
The boiler should be positioned so that at least the minimum
operational and servicing clearances are provided, see diagram
2.1.
Installation Clearances
Forrearflueinstallationthedimensionbetweentheboilermounting
wall and a permanent facing wall must be a minimum of “X”, see
diagram 3.1 and 3.3, plus 272mm.
For side flue installation the dimension between any adjacent
permanent walls must be a minimum of “Y”, see diagram 3.2 and
3.3, plus 332mm.
Forflueinstallationswhereinternal clearances are not practicable,
then external installation will be necessary.
Note: If the appliance is to be installed in a building where access
to the outside is not possible, due to height or other restriction a
internal flue installation kit is available. Part No. 452481.
This includes a larger wall sleeve (150mm dia.) which allows the
flue terminal to be inserted through the wall to the outside of the
building.
Forawallthicknessupto300mm,providedthereissufficientspace
available, the flue can be fully installed from the inside.
For a wall thickness over 300mm the external flue hole will need to
be made good from the outside.
If there is insufficient clearance the flue can be installed from
outside.
0183M
✽5
✽5
140
150
✽5
55
800
Diagram 2.1
✽Increase to 25mm clearance from
combustible material
Refer to text, Section 2.2 Clearances,
"Installation Clearances"
2 Boiler Position

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Diagram 3.3
Diagram 3.4
REAR FLUE 1,2 and 3 metre
SIDE FLUE 1,2 and 3 metre
Left or Right
Diagram 3.1
Diagram 3.2
WALL THICKNESS ‘X’: 75 to 400mm
DISTANCE ‘Y’: 80 to 338mm
“X”
REAR FLUE - STANDARD
“Y”
SIDE FLUE - STANDARD
Left or Right
63856384 6383 6382
1m FLUE DISTANCE ‘Y’: 80 to 818mm
2m FLUE DISTANCE ‘Y’: 80 to 1818mm
3m FLUE DISTANCE ‘Y’: 80 to 2818mm
“Y”
1m FLUE DISTANCE ‘X’: 75 to 880mm
2m FLUE DISTANCE ‘X’: 75 to 1880mm
3m FLUE DISTANCE ‘X’: 75 to 2880mm
“X”
3 Flue andVentilation
3.1 Flue
The flue must be installed in accordance with the rules in force in
the countries of destination. For UK, see current issue of BS5440
Part 1.
3.2 Flue Position and Length
Theair and flue ducting connectto the top of the boiler using a flue
elbow and can be positioned in one of three directions:
rearward, left or right.
The standard flue will provide the range shown in diagram 3.1 for
a rear flue or diagram 3.2 for a side flue.
If a longer flue duct is required, do not extend the ductings. A 1, 2
or3metrefluesystemandelbow/terminalkitmustbeusedandcan
be supplied. This will provide the range shown in diagram 3.3 for
a rear flue, diagram 3.4 for a side flue.
AFlueBendKitorVerticalFlueKitcanbesupplied,withinstructions.
3.3 Terminal Position
The minimum acceptable siting dimensions for the terminal from
obstructions,otherterminalsandventilationopeningsareshownin
diagram 3.5.
The terminal must be exposed to the external air, the position
allowing free passage of air across it at all times.
Carportsorsimilarextensionsofaroofonly,oraroofandonewall,
require special consideration with respect to any openings, doors,
ventsorwindowsundertheroof. Careisrequiredtoprotecttheroof
if made of plastic sheeting. If the car port comprises of a roof and
two or more walls, seek advice from the local gas undertaking
before installing the boiler.
If the terminal is fitted within 600mm below plastic guttering, an
aluminiumshield1500mmlongshouldbefittedimmediatelybeneath
the guttering or eaves. If the terminal is fitted within 450mm below
paintedeavesorapaintedgutter,analuminiumshield750mmlong
should be fitted immediately beneath the guttering or eaves.

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3 Flue andVentilation
MINIMUM SITING DIMENSIONS
FOR FANNED FLUE
TERMINALS POSITION
A DIRECTLY BELOW AN OPENABLE
WINDOW, AIR VENT, OR ANY OTHER
VENTILATION OPENING 300
B BELOW GUTTER, DRAIN/SOIL PIPE 75
C BELOW EAVES 200
D BELOW A BALCONY OR CAR PORT 200
E FROM VERTICAL DRAIN PIPES AND
SOIL PIPES 75
F FROM INTERNAL OR EXTERNAL
CORNERS 300
G ABOVE ADJACENT GROUND OR
BALCONY LEVEL 300
H FROM A SURFACE FACING THE
TERMINAL 600
I FACING TERMINALS 1200
J FROM OPENING (DOOR/WINDOW) IN
CAR PORT INTO DWELLING 1200
K VERTICAL FROM A TERMINAL 1500
L HORIZONTALLY FROM A TERMINAL 300
MINIMUM
SPACING
in mm
0103M
Under Car Port etc.
H,I
JD
F
K
A
A
FGEA
G
G
G
B,C B,C
FF
K
K
K
C
G
LL
High Vent 392cm2(60.8in2) 196cm2(30.4in2)
Low Vent 392cm2(60.8in2) 196cm2(30.4in2)
TABLE 3
Position Air from Air Direct
of Room or from
Air Vent Internal space Outside
Diagram 3.5
4783
3.4 Terminal Guard
Aterminalguardisrequiredifpersonscouldcomeintocontactwith
the terminal or the terminal could be subject to damage.
If a terminal guard is required, it must be positioned to provide a
minimum of 50mm clearance from any part of the terminal and be
central over the terminal.
The guard should be similar to that shown in diagram 3.5, and can
be bought from:
Tower Flue Components Ltd
Morley Road
Tonbridge
Kent
TN9 1RA
their type K3.
3.5 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 document
IGE/UP/7/1998. Ifindoubtseekadvicefromthelocalgasundertaking
or Hepworth Heating Ltd.
3.6 Room Ventilation
Theboilerisroomsealed,sowhenitisinstalledinaroomorspace,
a permanent air vent is not required.
3.7 Cupboard or Compartment Ventilation
Iftheboileristobefittedinacupboardorcompartment,permanent
highandlow level air ventsmustbeprovided Theventsmusthave
at least the effective areas as given in Table 3.

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4 Heating System
Diagram 4.1
AVAILABLE PUMP HEAD SYSTEM HEATING LOAD
FLOW RATE
✽ACCEPTABLE
DIFFERENTIAL
RANGES
SYSTEM DIFFERENTIAL TEMPERATURE
✽
30
40
50
60
70
80
Btu/h x1000
10
12
14
16
18
20
22
kW
0
5
10
15
20
FEET
1
2
3
4
5
6
M
11 15 20 25 30 35 Litres/Min
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 Gallons/Min
0
5
0
5
10
15
20
25
30
35
10
11
15
17
20
˚C ˚F
PUMP CURVE - SETTING 2
PUMP CURVE - SETTING 3
0194M
4.1 General Notes
The boiler is for use in sealed water systems only.
4.2 Safety Valve
The safety valve is an integral part of the boiler and it cannot be
adjusted.
4.3 Pressure Gauge
A pressure gauge is incorporated into the boiler to indicate the
system pressure.
4.4 Pump
The pump is integral with the boiler.
Theremainingcirculatingpressureheadavailablefromthepumpis
shown in diagram 4.1.
4.5 Expansion Vessel
The boiler has an integral expansion vessel with a capacity of
8Litres (1.76gallons), with a charge pressure of 0.75bar.
The maximum heating system water content using the fitted
expansion vessel ranges from 119Litres with a cold fill pressure of
0.7bar, to 98Litres with a cold fill pressure of 1.05bar. If, due to a
high static head, the cold fill pressure is higher, then the expansion
vessel pre-fill pressure must be increased, and the maximum
system volume decreased.
4.6 Flow Rate
A valve must be incorporated in the main flow or return of the
system,valve “A”showninthe flowindiagram4.2. This valvemust
be lockable and positioned so that inadvertent closure or
unauthorised interference is not possible. The design differential
can be between 11oC (20oF) and 17oC (30oF), dependent on the
system resistance and the available pump head. The pump
adjuster should normally be left at maximum (3) but in some cases
it is permissible to adjust the pump to a lower setting (2). See
diagram 4.1.
To use diagram 4.1 start with the required heating system load.
Intheexampleshownthemaximumboileroutputhasbeenchosen,
23.5kW (80,000Btu/h).
Draw a horizontal line from the required system differential
temperature axis to intersect the curve. In the example 11oC
(19.8oF)hasbeenchosen, shown - ---. At the point ofintersection
draw a vertical line to cross the pump curve. From this point draw
a further horizontal line to determine the available pump head. In
theexample2.4m(7ft9in)isavailable. Agreaterpumpheadcanbe
achieved by choosing a higher system differential temperature, up
to a maximum of 3.8m (12ft 6in) at a system differential of 17oC
(30.6oF). The system must be designed such that the available
pump head is not exceeded.
If the heating system load is less than 14.7kW (50,000Btu/h) then
it is permissible to adjust the pump setting to (2), shown
This results in an available pump head of 2.1m (7ft). This is the
maximum that can be achieved with the pump at this setting.
4.7 Bypass
It is ESSENTIAL that a bypass of 22mm od minimum is fitted to all
installations. The bypass must have a lockable valve, “B” in
diagram 4.2, incorporated in a position so that inadvertent closure
is not possible.
The bypass MUST be fitted before any system control. A radiator
bypass is NOT recommended.
4.8 Make Up
Provision can be made for replacing water lost from the system
using a make up bottle mounted in a position higher than the top
point of the system, connected through a non-return valve to the
return side of the heating circuit, see diagram 4.2.
Alternatively, provision for make up can be made by pre-
pressurisation of the circuit.

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4 Heating System
Diagram 4.2
BOILER
3-LITRE
MAKE-UP
BOTTLE
(if required)
NON-RETURN
VALVE
AUTO AIR
VENT
DOMESTIC
WATER
HOT
COLD SUPPLY
FILLING
POINT
DRAIN
POINT
MIN. 22mm
DIA. BY-PASS
'B'
'A' BY-PASS
VALVE
FLOW CONTROL
VALVE
HEATING
CIRCUIT
RETURN
ADDITIONAL
EXPANSION
VESSEL
(if required)
2818
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 4.3
4.9 Filling Sealed Systems
Provision for filling the system at a low level must be made.
Three methods of filling are shown in diagram 4.3. There must be
nopermanent connection to the mains water supply, even through
a non-return valve. NOTE: It is important that fittings used for
connection to potable water comply with the water undertakers
requirements.
4.10 Corrosion Inhibitor
Ifaninhibitoristobeusedinthesystem,contactamanufacturerso
that they can recommend their most suitable product.
When fitting the boiler into an existing system, special care should
be taken to drain the entire system, including radiators, then
thoroughly cleaning out before fitting the boiler whether or not
adding an inhibitor.
4.11 Draining Tap
A draining tap must be provided at the lowest points of the system,
which will allow the entire system to be drained. An additional
draining tap MUST be fitted close to the boiler.
The flow and return isolation valves are provided with drain points
for boiler heat exchanger drainage.
5.1 General
The domestic hot water service must be in accordance with the
rules in force in the countries of destination.
5.2 Water Pressure
Fortheminimumandmaximum workingpressuresofthedomestic
hot water circuit of the boiler, refer to Section 1.6. If the cold water
supplypressureexceedsthemaximum, a pressure reducing valve
must be fitted in the supply to the boiler to reduce the pressure to
within the limits given.
5.3 “Hard” Water Areas
In areas where the water is “hard”, that is, more than 200mg/litre,
it is recommended that a proprietary scale reducer is fitted in the
coldsupplytotheboiler. Checkthetotalwater“hardness”usingthe
kit supplied, in the door, following the instructions given. Consult
the local water company for additional advice.
Adoublecheckvalveassemblymustbefittedupstreamofthescale
reducer.Fortherelativeposition of the scale reducer and pressure
reducingvalve,ifrequired,refer to the manufacturer’s instructions.
5 Domestic Hot Water System

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125
electronic
Diagram 6.3
FAN SECURING
SCREWS
Diagram 6.2
VIEWING
WINDOW
INNER CASE
COVER SECURING
SCREW (4)
DATA
LABEL
ELECTRICAL
PLUG
AIR
PRESSURE
TUBE
4561
6920
Diagram 6.1
6504
CLOCK TIMER
RESET SWITCH AND
NEON INDICATOR
CENTRAL
HEATING
SELECTOR
SWITCH
DOOR
OUTER CASE
SECURING SCREW (2)
(IF CLOCK TIMER
FITTED(4))
6.1 Unpacking
Remove the top carton and cut out the flue template from the inner
flap.
Open the control door, see diagram 6.1.
Removethetwoscrewssecuringtheoutercaseandthenliftitatthe
top and pull it forwards and off, see diagram 6.1.
Removethecover of the inner case,securedwith four screws, see
diagram 6.2
Slacken flue collector thumb screws.
Remove the fan securing screws.
Disconnecttheelectricalplugconnectorandairpressuretubefrom
the fan, see diagram 6.3.
Pullthefanforwards,atthe bottom and rotate to disengage thefan
outlet from rear bracket.
Take care not to damage the seal.
Tilt the fan and withdraw.
Disconnect the gas cock union and the front unions of the isolation
valves, see diagram 6.4.
Slightly loosen the clips of the gas service cock and the isolating
valves.
Removethetwoboilersecuringscrewsthenremovetheboilerfrom
the mounting frame, by pulling the studs from the clips and
unhooking it at the top.
6.2 Marking
Theboilermountingframeisthesamewidthastheboilercase. The
flue connection is on the top.
IMPORTANT:Shouldinternalflueinstallation kit(PartNo.452481)
whichwillenabletheflue terminal to be inserted through the wall to
the outside of the building be used, provision should be made to
prevent any injury or damage due to falling debris.
Placetheboilermountingframeonthewallintherequiredposition,
seediagram2.1,tomaintain minimum clearances. Make sure that
the isolation valves are at the bottom facing forward and that the
frametopishorizontal,thenmarkthefourwallfixingpointsthrough
the holes in the two horizontal straps.
Position the flue template on the wall, the arrow points on the
centres of the two upper fixing points previously marked, see
diagram 6.5 which also gives dimensions.
For a rear flue, mark the position as required.
Forasideflue,markthehorizontalfluecentrelineatthesidesofthe
template. Extend the flue centre line horizontally left or right to the
internal corner where the flue is required to exit to outside.
Markthepositionofthecircularhole,ontheflueexitwall,usingthe
dimensions given in diagram 6.6.
From the flue position marks, check that the flue terminal will be in
a suitable position, see diagram 3.5.
6 Appliance and Flue Preparation
6.3 Flue Hole Cutting
Having marked out the flue centre, cut a hole for the flue, using,
preferably, a 130mm minimum core drill.
Note: If using the internal flue installation kit, the hole should be
150mm diameter.
Cut the hole horizontally in the wall, making sure that it does not
slope down towards the boiler.

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6 Appliance and Flue Preparation
Diagram 6.6
0176M
Diagram 6.5
TOP OF
BOILER
300
FLUE
TEMPLATE
(Cut from
carton top
inner flap)
BOILER
MOUNTING FRAME
FIXING POINTS
FLUE
CENTRE
LINE
CORNER (Right Flue) CORNER (Left Flue)
MIN. CLEARANCE
111.5 70
591.5
480
130 Dia.
168 168
130 Dia.
FLUE
CENTRELINE
Diagram 6.4
SECURING
SCREW (2)
UNIONS (5)
CLIP (5)
LOCATION CLIPS
6921
0177M
6.4 Wall Sleeve
Note: If required, an optional Wall Liner Kit, Part No. 900861, is
available, complete with fixing instructions.
6.5 Boiler Mounting Frame Fixing
Position the flue template over the flue hole and check the position
ofthe wall fixing points. Mark the position of the fixingholes again,
if required.
Drill the four fixing holes and insert wall plugs to suit No.10x50mm
screws.
Secure the boiler mounting frame to the wall using No.10x50mm
screws.

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7.1 Flue Length
For a rear flue, measure the distance from the outside wall face to
theboiler mountingwall. Checkthatthefluelength willbesuitable,
see diagram 3.1 for a standard flue system or diagram 3.3 for a 2
or 3metre flue system.
For a side flue, measure the distance from the outside wall face to
thesideoftheboilermountingframe. Check thatthefluelengthwill
be suitable, see diagram 3.2 for a standard flue system or diagram
3.4 for a 2 or 3metre flue system.
7.2 Rear Flue
Note. Do not cut the flue duct at the pre-drilled end.
Marktheairduct/terminalassemblyandtheflueductatthelengths
shown in diagram 7.1 then cut to length, cutting square and
removing any burrs.
7.3 Side Flue
Note. Do not cut the flue duct at the pre-drilled end.
Marktheairduct/terminalassemblyandtheflueductatthelengths
shown in diagram 7.2 then cut to length, cutting square and
removing any burrs.
7.4 Flue Assembly
Locatetheflueduct,drilledend,ontotheflueelbowandsecurewith
screw supplied in loose items pack, see diagram 7.3.
Slide the spacer onto the flue duct.
Locate the flue duct/elbow into the air duct/terminal spigot and the
air duct/terminal into the flue elbow making sure of the correct
alignment of top. Drill the air duct and secure/seal (external fixing,
do not seal) as shown in diagram 7.3.
7.5 Wall Liner
If a wall liner is used, fit self adhesive seal as follows:
For wall thickness up to 300mm fit the self adhesive seal to the air
duct, see diagram 7.5, make sure the joint is on top.
For wall thickness over 300mm see diagram 7.4.
7 Flue Preparation
Diagram 7.2
OUTSIDE
WALL FACE
"Y"
Diagram 7.1
BOILER
MOUNTING
WALL
"X"
SIDE OF
BOILER
MOUNTING
FRAME
OUTSIDE
WALL
FACE
Diagram 7.3
FLUE ELBOW
FLUE DUCT SECURING
SCREW (1)
AIR DUCT/
TERMINAL
SEALING TAPE
3mm Drill
FLUE DUCT/
ELBOW
FLUE
SPACER
"Y" plus 182
(FLUE DUCT,
AIR DUCT/
TERMINAL
ASSEMBLY)
"X" plus 120
(FLUE DUCT,
AIR DUCT/TERMINAL ASSEMBLY)
6386
6470
6471

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Diagram 7.4
7 Flue Preparation
Diagram 7.5
FLUE
TERMINAL
WALL
LINER
AIR
DUCT
OUTSIDE
WALL FACE
48
Diagram 7.6
130 DIA
CORE
DRILLED
HOLE
FOAM
SEAL
AIR DUCT/
TERMINAL
FOAM
SEAL
AIR DUCT/
TERMINAL
Q
20mm
Q minus 55mm
63876388
6389
FOAM
SEAL
7.6 Internal Flue Assembly
Note: This requires the use of the internal flue installation kit.
Placetheflueassemblyintotheflueholetomakesurethattheflue
terminal is correctly positioned and is the correct distance from the
outsidewallface,seediagram7.6andtheappropriatediagram7.1
or 7.2.
7.7 External Flue Assembly
Removethe flue elbowfrom the air/terminalduct and theflue duct.
From outside place the flue/air duct assembly into and through the
wall.

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221474C
8 Gas andWater Connections
Diagram 8.1
Diagram 8.2
EXPANSION
VESSEL POSITION
20mm 46mm
320
DOMESTIC
WATER CENTRAL HEATING
NOTE:
Keep any pipework
clear of shaded area
80
90
140
SLOT (CLOSED) DRAIN
POINT SLOT (CLOSED)
GAS
SERVICE
COCK
‘NOTCH’ MARKING POSITION OF
SAFETY VALVE DISCHARGE
HEATING
FLOW HEATING
RETURN DOMESTIC
HOT WATER
OUT
63
2297
DOMESTIC
COLD WATER
SUPPLY IN
BOILER
MOUNTING
FRAME
8.1 Gas Connection
The gas supply can be connected from below or through the wall
at the rear of the boiler, see diagram 8.1 for position.
Refer also to Section 1.7.
Make the gas supply connection to the gas service cock. Slacken
orremovetheclip,asdesired,whilstmakingtheconnection. Donot
subject the gas service cock to heat.
8.2 Water Connections
Provisionismadeforthewaterconnectionstobemadefrombelow
orthroughan internal wallatthe rear oftheboiler, see diagram8.1
for position.
Provisionismadeforthedomestichotwateroutletandheatingflow
and return pipes to be connected from above, if desired, passing
downeithersideoftheboiler,seediagram8.2forclearances. Take
care that any pipework connected from above, within the boiler
mounting frame will clear the expansion vessels.
Flush out the domestic hot water and the heating systems before
connecting to the boiler.
Make the connections to the domestic hot water outlet by straight
connector and heating systems by way of the isolating valves, see
diagram 8.1.
Slacken or remove the clips, as desired, while making the
connections. Do not subject any of the isolating valves to heat.
Makesurethatthedrainpointsontheisolatingvalvesarepositioned
towards the front of the boiler, also that the drain and operating
screw heads are accessible.
8.3 Safety Valve Discharge
WARNING. Itmustnotdischarge above an entrance orwindowor
any type of public access area.
Ashortdischargepipeissuppliedloosewiththeboiler,whichwhen
fitted to the safety valve, will end below the boiler at the mark
between the cold water inlet and the heating flow, for position and
dimension see diagram 8.1.
This must be extended, using not less than 15mm od pipe, to
discharge,inavisibleposition,outsidethebuilding,facingdownward,
preferably over a drain. The pipe must have a continuous
fall and be routed to a position so that any discharge of water,
possibly boiling, or steam cannot create any danger to persons,
damage to property or external electrical components and wiring.
Note. To make future servicing easier it is advisable to use a
compression type fitting to extend thedischarge pipe.

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9 Electrical Connections
INTEGRAL CLOCK
INTEGRAL CLOCK
INTEGRAL CLOCK
INTEGRAL CLOCK
EXTERNAL CLOCK INTEGRAL CLOCK
Diagram 9.1
JUNCTION
BOX
3 AMP
FUSE
LN
230V~50Hz
PERMANENT MAINS
SUPPLY
230V~50Hz
ROOM STAT. 230V~50Hz FROST STAT.
TO BOILER
RED LINK.
REMOVE WHEN
CONNECTING
SYSTEM CONTROLS
5 POLE CONNECTOR ON
MOUNTING FRAME
230V~50Hz
POTENTIAL
FROST STAT.
230V~50Hz
POTENTIAL
ROOM STAT.
(3) (L) (N) (2) (1)
JUNCTION
BOX
3 AMP
FUSE
LN
230V~50Hz
PERMANENT MAINS
SUPPLY
230V~50Hz
ROOM STAT. USED AS LINK
230V~50Hz
FROST STAT.
TO BOILER
RED LINK.
REMOVE WHEN
CONNECTING
SYSTEM CONTROLS
5 POLE CONNECTOR ON
MOUNTING FRAME
MAINS
POTENTIAL
FROST STAT.
MAINS
POTENTIAL
ROOM STAT.
(3) (L) (N) (2) (1)
JUNCTION
BOX
3 AMP
FUSE
LN
230V~50Hz
PERMANENT MAINS
SUPPLY
230V~50Hz
FROST STAT. NO ROOM STAT.
TO BOILER
RED
LINK
5 POLE CONNECTOR ON
MOUNTING FRAME
MAINS
POTENTIAL
FROST STAT.
(3) (L) (N) (2) (1)
3 AMP
FUSE
LN
230V~50Hz
PERMANENT MAINS
SUPPLY
POTENTIAL
FREE ROOM STAT. NO FROST STAT.
TO BOILER
RED LINK.
REMOVE WHEN
CONNECTING
SYSTEM CONTROLS
5 POLE CONNECTOR ON
MOUNTING FRAME
POTENTIAL FREE
ROOM STAT.
(3) (L) (N) (2) (1)
DOUBLE
POLE
ISOLATOR
JUNCTION
BOX
3 AMP
FUSE
LN
230V~50Hz
PERMANENT MAINS
SUPPLY
230V~50Hz ROOM STAT. NO FROST STAT.
TO BOILER
RED LINK.
REMOVE WHEN
CONNECTING
SYSTEM CONTROLS
5 POLE CONNECTOR ON
MOUNTING FRAME
MAINS POTENTIAL
ROOM STAT.
(3) (L) (N) (2) (1)
5 POLE CONNECTOR ON
MOUNTING FRAME
TO BOILER
RED LINK.
REMOVE WHEN
CONNECTING ANY
HEATING SYSTEM
CONTROLS
TIME
CONTROL
CLOCK
SWITCH
CONTACTS
(3) (L) (N) (E) (2) (1)
JUNCTION
BOX
3 AMP
FUSE
ROOM
THERMOSTAT
FROST
THERMOSTAT
LNE
230V~50Hz
PERMANENT
MAINS SUPPLY
ELECTRICITY SUPPLY CONNECTIONS
DOUBLE
POLE
ISOLATOR
DOUBLE
POLE
ISOLATOR
DOUBLE
POLE
ISOLATOR
DOUBLE
POLE
ISOLATOR
DOUBLE
POLE
ISOLATOR
(E)
(E)
(E)
(E)
(E)
E
E
E
E
E
0060M

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9 Electrical Connections
Diagram 9.2
MAINS
CABLE
CABLE
CLAMP
LNE2
3
1
COVER
SCREW (2)
RED LINK
Remove when
connecting any
heating system
controls.
2643
9.1 Supply Cable Connection
The boiler requires a permanent mains supply through an isolator
which must also isolate any heating system controls, see diagram
9.1.
Any heating system controls must not interrupt the permanent
mains supply to the boiler.
Remove the electrical connector from the loose
items pack.
Removethetwoscrewsandcoverfromtheconnector,seediagram
9.2.
Using PVC cable of suitable length and rating as stated in Section
1.8, connect the mains supply cable to the appropriate terminals of
the connector, see diagram 9.1.
Standard colours are, Brown - Live; Blue - Neutral; Green and
Yellow - Earth.
The mains cable outer insulation must not be cut back external to
the plug, see diagram 9.2.
Make the earth cable of a greater length so that if the cable is
strained the earth would be the last to become disconnected.
CAUTION. It is essential that the polarity is correct.
9.2 Heating System Controls
CAUTION: To prevent an induced current from switching the
centralheatingon,whennotrequired,itisimportantthattheheating
system control cables are separated from the other mains supply
cables.
Theheatingsystemshouldhaveinstalled:aprogrammerandroom
thermostat controlling the boiler.
Thermostatic radiator valves may be installed in addition to the
room thermostat.
Note: For further information, see The Building Regulations 1991 -
Conservationoffuelandpower,1995edition-AppendixG,table4b.
If electrical controls are not to be used to regulate the heating
system, do not disturb the red link cable.
When any form of electrical control is being used to regulate the
heating system, remove the red link cable and connect heating
system controls in series.
The mains cable outer insulation must not be cut back external to
the plug.
9.3 Clock/Timer
An internal clock/timer kit can be supplied, refer to the literature
supplied with it.
9.4 Frost Thermostat
Iftheinstallationrequiresprotectionbya“frostthermostat”,connect
a single pole type, to the appropriate terminals of the connector.
9.5 Cable and Connector Securing
After completing all the connections to the boiler, secure the
cable(s) with the cover, using the two screws previously removed,
see diagram 9.2.
10 Boiler Fixing
10.1 Mounting the Boiler
After installing the flue, boiler mounting frame, gas, domestic and
heating systems, making the electrical connections and preparing
the flue components, continue as below:
Lifttheboilerintoposition,hookingitontotheboilermountingframe
atthe top,fullypushtheboiler backtothemountingframe,locating
the studs into the clips, then loosely fit the two boiler securing
screws at the top, see diagram 10.1.
10.2 Internal Flue Fixing
Fit gasket to flue elbow.
Secure the flue assembly to the boiler, see diagram 10.1.
Fit the fan to the flue elbow spigot making sure the fan sealing ring
is fitted correctly and secure with the previously removed screws.
Secure the flue collector screws.
Make good internally and externally around flue.
10.3. External Flue Fixing
Fit gasket to flue elbow.
Locate flue elbow onto the boiler.
Fit the fan to the flue elbow spigot making sure the fan sealing ring
is fitted correctly and secure with the previously removed screws.
Secure the flue collector screws.
Pulltheflue/airduct(s)forwardandengageontotheflueelbow,see
diagram 10.2. Check the wall face to terminal dimension, see
diagram 7.6.
Pushtheairductbackintothewall,whilstholdingtheflueductonto
the flue elbow, then secure the flue duct to the elbow, see diagram
10.2.
Pull the air duct back into engagement with the flue elbow and
secure/seal.
Make good internally and externally around flue.