Glowworm 47 313 18 Operating manual

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4309
221473B.03.99
Hepworth Heating Ltd.,
Nottingham Road, Belper, Derbyshire. DE56 1JT
General/Sales enquiries:
Tel: [phone] Fax: [phone]
One Contact Local Service
Customer Services:
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Fax: [phone]
Instructions for Use
Installation and Servicing
Tobeleftwiththeuser
This is a Cat I2H Appliance
Fanned Flue Combination Boiler
With Honeywell gas control
G.C. No. 47 313 18
100e
❑
✔
❑
✔
❑
✔
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
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
to offer our customers' a Comprehensive First Year Guarantee.
In the center pages are to be found your Guarantee Registration Card, which we recommend you complete and
return as soon as possible.
If this card is missing you can obtain a copy or record your registration by telephoning the Heatcall Customer
Service number 01773 828100.
Our Guarantee gives you peace of mind plus valuable protection against breakdown by covering the cost of:
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.

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Important Information
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 0087.
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.
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 14
Installation Preparation 6 15
Flue Preparation 7 16
Gas and Water Connections 8 18
Electrical Connections 9 19
Boiler Fixing 10 21
Commissioning 11 22
General Data 1 26
Servicing 2 27
Fault Finding 3 28
Replacement Parts 4 35
Spare Parts 5 47
CONTENTS DESCRIPTION SECTION PAGE No.
INSTRUCTIONS
FOR USE
INSTALLATION
INSTRUCTIONS
SERVICING
INSTRUCTIONS

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Clock / Timer
Digital
timer Electro /
mechanical
clock / timer
6509
Introduction
Please read these instructions and follow them carefully for the
safe and economical use of your Combination boiler.
This boiler must have been installed by a competent person in
accordancewiththerulesinforceinthecountriesofdestination.
Once the pilot has been lit and the controls set, the boiler is
automatic in operation.
The Swift-flow combination boiler is able to provide room
heating as part of a central heating system and domestic hot
water 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
Ifagasleakorfaultexistsorissuspected,turntheboileroffand
consult your local gas company or your local installation/
servicing company.
Domestic Hot Water Temperature
NOTE. Themainswatertemperatureinthewinterislowerthan
in the summer.
Thewatertemperaturecanbeincreasedorreducedbyadjusting
the flow rate at the hot water draw off tap.
Boilers Installed in Compartments
Ifthe boiler has been fittedinto a compartmentor cupboard, do
not 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
heatingsystemcontrolstotheelectricalsupply,mustbethrough
one common isolator.
Isolation should preferably be by a double pole switched fused
spurbox. The fused spurbox shouldbe readilyaccessible and
preferably adjacent to the appliance. It should be identified as
to its use.
Alternatively a fused 3A 3 pin plug and shuttered unswitched
socket may be used.
Thecoloursofthreecoreflexiblecableare,blue-neutral,brown
- live, green and yellow - earth.
Asthemarkingsonyourplugmaynotcorrespondwiththese
colours continue as follows:-
The wire coloured blue must be connected to the terminal
marked “N” or “Black”.
Thewirecolouredbrownmust beconnectedtotheterminal
marked “L” or “Red”.
The wire coloured green and yellow must be connected to
the terminal marked “E” or “Green” or the earth symbol .
PVCflexible cable havinga conductorsize of0.75mm2(24/
0.20mm) must be used within the boiler casing to connect
to the boiler.
Electrical Supply Failure
The boiler will not work without an electrical supply.
Normal operation of the boiler should resume when the
electrical supply is restored.
Note. The boiler safety cutoff may have operated, please
refer to the following section to reset.
Reset any external controls, to resume normal operation of
the central heating.
The digital timer, has a lithium battery back up and will not
need resetting.
Boiler Safety Cutoff Reset Button
The boiler is fitted with a safety cutoff device to prevent
damage 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, due to no system demand. It is suggested that a hot
waterdraw off tap beopened 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.
Timecan be set either “On”or “Off” in fifteen minutesegments.
Note. Theclocksuppliedcouldbefittedwithanoverridedevice,
see diagram 1, which switches the clock programme “On” or
“Off” permanently.
Theswitchwillneed toberepositioned toresumeprogrammed
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.
It is fitted with a lithium battery back up which protects the
programme 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.
During this time the red light will continue to flash and the
boiler will not work.
If this happens you MUST call your installation or
servicing company.
To Operate the Boiler
1. Check that all five isolating valves are open, the slots in
line with 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.
Only operate the boiler when you are sure that the system has
beenfilledandpressurised. Checkthisbylookingatthepressure
gauge “A”, diagram 3, it should read 0.7bar minimum.
4. Check reset button neon, refer to previous instructions
on page 4.
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 contact your installation/servicing company or the local
gas company.
7. Check that the electrical supply to the boiler is ON at
the external isolator.
8. Set switch “C”, clock/timer (if fitted) and any remote controls
as required.
Close the door.
In certain circumstances, a surge in water pressure may cause
theappliancetooperatemomentarily,thiswillbeindicatedbythe
pumpstartingandthefanspeedincreasing. Thisisquitenormal.
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 or other remote control these
controls must be calling for heat for the boiler to operate.
The user central heating temperature control enables
you to control 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. When the hot water tap is closed, the main
burner flames will decrease in size but will remain alight until
the boiler controls or any 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”
asshownindiagram3andmakesureallthedomestichotwater
draw off taps are closed.
Setswitch “C” to “On” as shown in diagram3 to turn the central
heating on again..
To Turn the Boiler Off
Toturntheboileroff,isolatetheboilerfromtheelectricalsupply.
To turn on again following the operating instructions.
Domestic Hot Water Temperature
NOTE. Themainswatertemperatureinthewinterislowerthan
in the summer.
Thewatertemperaturecanbeincreasedorreducedbyadjusting
the flow rate at the hot water draw off.
Maintenance and Servicing
To ensure the continued efficient and safe operation of the
appliance 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.
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 1.
To ensure the continued efficient and safe operation of the
appliance 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 4.
Clearances
The boiler requires a clearance in front, below and at the sides
ofthecasingforsafety,servicingandmaintenanceaccess,see
diagram 5.
Instructions for Use

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55
150 5
5
150
5
*
**
*
Increase to 25mm clearance from
combustible material.
Dimensions in millimetres
800
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)
Diagram 3
6622
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'
Protection Against Freezing
Iftheboileristobeoutofuseforanylongperiodsduringsevere
weather, it is recommended that the whole system, including
the combination boiler, should be drained to avoid the risk of
freezing.
Ifindoubt,contactyouinstallation/servicingcompanyforadvice.
Draining and Filling
CAUTION. This boiler works in a pressurised system which
must only be drained, refilled and pressurised by a competent
person.
Note: Ifthepressuregaugeindicatesalossofsystempressure,
that is, less than 0.7bar, YOU MUST CONTACT YOUR
INSTALLER.
Pressure Relief Safety Valve
CAUTION. Apressurerelief safetyvalve anddischargepipe is
fittedtotheboiler. Thisvalvemustnotbetouched. Shouldthere
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.
The boiler casing can be cleaned using a mild liquid detergent
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
incorrect fitting may result in incorrect operation or failure to
operate at all. If in doubt seek advice from the local gas
company or your installation/ servicing company.
Replacement Parts
Ifreplacement parts are requiredapply to your local supplieror
British Gas.
Please quote the name of the appliance.
Diagram 5
2811
Instructions for Use

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Diagram 1.2
1 General Data
Diagram 1.1
5275 2804
ALL DIMENSIONS in MILLIMETRES
KEY:
22mm COMPRESSION
CENTRAL HEATING
15mm COMPRESSION
DOMESTIC WATER
Rc
1/2
(
1/2
in. BSPT)
GAS CONNECTION
63 331
168
133
450
63
SAFETY
VALVE
DISCHARGE
783
25
2.5
66
66 107 107
101
WATER
THROTTLE
MINI
EXPANSION
VESSEL
HEAT EXCHANGER
MAIN BURNER
PRESSURE
SWITCH
D.H.W.
COLD
INLET
C.H.
FLOW
SAFETY
VALVE DISCHARGE
PUMP
SPARK
ELECTRODE
AUTOMATIC
AIR VENT
FANNED
FLUE
EXPANSION
VESSEL
FLOW
SWITCH
SAFETY
VALVE
GAS VALVE
D.H.W.
HOT
OUTLET
C.H.
RETURN
GAS
SUPPLY
1.1 Installation
Materials and equipment should be fit for their purpose and of
suitable quality and workmanship.
1.2 Important Notice
This boiler is for use only on natural gas, G20.
1.3 Sheet metal Parts
WARNING. When installing the appliance, care should be
taken to avoid any possibility of personal injury when handling
sheet metal parts.
1.4 Requirements
Theinstallationofthisboilermustbecarriedoutbyacompetent
person in accordance the rules in force in the countries of
destination.
Manufacturer’s instructions, supplied.
Manufacturer’s instructions must not be taken as overriding
statutory requirements.

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■For larger systems use an additional expansion vessel, see Section 4.
❋Boiler starts at an inlet pressure of 0.5bar but requires 0.8bar for maximum output.
●Ball valves are fitted in water and gas connections, plus a drain point on all water connections.
Lift Weight 37.0kg (81.4lb)
Total Weight 50.4kg (111lb)
●Gas connection Rc1/2(
1
/
2
in 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)
❋D.H.W 0.5 to 10bar
working pressure (7.25 to 188lbf/in2)
■Maximum Heating 119 litres
system water (26.2 gallons)
content using with a cold
fitted expansion fill pressure
vessel. of 0.7bar
Electrical supply 230V~50Hz
Electrical rating 154W fused 3A
Internal Fuse rating 1) Type T2A
2) Type T630mA
NOMINAL kW 20.21 36.2 11.63
HEAT
INPUT (NETT) Btu/h 68,953 123,500 39,678
NOMINAL kW 17.6 29.3 9.1
HEAT
OUTPUT Btu/h 60,000 100,000 31,000
BURNER mbar 6.2 15.5 1.8
PRESSURE in.wg 2.6 6.2 0.7
APPROX. m
3
/h 2.1 3.4 1.2
GAS RATE ft
3
/h 75.8 121.8 43.4
TABLE 1 C.H. Max D.H.W Max MIN
TABLE 2
1 General Data
1.5 Data Label
The data label is on the inner case cover.
1.6 Data
See Tables 1 and 2.
1.7 Gas Supply
Thegasinstallationmustbeinaccordancewiththerulesinforce
in the countries of destination.
The supply from the governed gas meter must be of adequate
size to provide a steady inlet working pressure of 20mbar (8in
wg) at the boiler.
1.8 Electrical Supply
WARNING: The boiler must be earthed.
The electrical installation must be in accordance with 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
heatingsystemcontrolstotheelectricalsupply,mustbethrough
one common isolator.
Isolation should be by a double pole switched fused spur box,
with a minimum separation of 3mm in both poles. The fused
spur box should be readily accessible and preferably adjacent
to the appliance. It should be identified as to its use.
Alternatively connection can be made through an unswitched
shuttered socket and 3A fused 3 pin plug.
The mains supply cable and other cables connected to the
boiler must be the PVC flexible type of at least 0.75mm2, (24/
0.20mm).

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2 Boiler Position
2.1 Location
The boiler must be installed in accordance with the rules in
force in the countries of destination.
The boiler is not suitable for fitting out of doors.
Any electrical switch or boiler control using mains electricity
must be positioned so that it cannot be touched by a person
using the bath or shower.
The boiler must be mounted on a flat wall which is sufficiently
robust to take its weight, refer to Section 1 ‘Data’.
If the location of the boiler or any part of the system is subject
to severe cold weather conditions, it is recommended that a
frost thermostat is fitted. Any part of the system that may be
vulnerable to freezing must be protected.
If the boiler is to be fitted into a cupboard, compartment or
unusual location, special procedures are necessary.
Make sure that the cupboard or compartment air vents are
positioned to be clear of obstructions at all times, refer to
Section 3.
2.2 Clearances
The boiler should be positioned so that at least the minimum
operationalandservicingclearancesareprovided,seediagram
5 Instructions for Use.
Additional clearances may be required around the boiler for
installation.
For flue installations where external access is not practicable,
the clearances around the boiler may need to be increased as
follows.
For rear flue installations the dimension between the boiler
mountingwallandapermanentfacingwallmustbeaminimum
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 3.4, plus 332mm.

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Diagram 3.4
SIDE FLUE - 1 and 2 metre
Left or Right
1m DISTANCE 'Y' = 80 TO 843mm
2m DISTANCE 'Y' = 80 TO 1843mm
3 Flue andVentilation
"Y"
4739
3.1 Flue
Ventilation must be provided in accordance with the rules in
force in the countries of destination.
The following information refers specifically to his boiler:
3.2 Flue Position and Length
Theairandflueductingconnecttothetopoftheboilerusingthe
air box and can be positioned in one of three directions:
Rearward, left or right.
Thestandardflueisabletoprovidetheductlengthrangeshown
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.
A1or2metre fluesystemand elbow/terminal kit mustbeused
and can be supplied.
This is able to provide the duct length range shown in diagram
3.3 for a rear flue, diagram 3.4 for a side flue.
A Vertical Flue Kit can be supplied with instructions.
To make a neat finish to the flue outlet a flue collar kit, part No.
443286, with instructions, is available.
Theuse of this collar will mean that theflue lengths will need to
be altered, full instructions are given in the kit.
Diagram 3.3
REAR FLUE - 1 and 2 metre
4738
"X"
Diagram 3.2
SIDE FLUE - STANDARD
Left or Right
DISTANCE 'Y': 80 TO 353mm
Diagram 3.1
WALL THICKNESS 'X': 75 TO 408mm
2813 2812
REAR FLUE - STANDARD
"X"
"Y"
1m DISTANCE 'X' = 75 TO 898mm
2m DISTANCE 'X' = 75 TO 1898mm
3.3 Terminal Position
The minimum acceptable siting dimensions for the terminal
fromobstructions, otherterminals andventilation openingsare
shown in diagram 3.5.
The terminal must be exposed to the external air, the position
allowing free passage of air across it at all times.
Car ports or similar extensions of a roof only, or a roof and one
wall,requirespecialconsiderationwithrespecttoanyopenings,
doors, vents or windows under the roof. Care is required to
protect the roof if made of plastic sheeting. If the car port
comprisesofaroofandtwoormorewalls,seekadvicefromthe
local gas undertaking before installing the boiler.
Ifthe terminal is fittedwithin 600mm below plastic guttering,an
aluminium shield 1500mm long should be fitted immediately
beneath the guttering or eaves. If the terminal is fitted within
450mm below painted eaves or a painted gutter, an aluminium
shield 750mm long should be fitted immediately beneath the
guttering or eaves.

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3 Flue andVentilation
MINIMUM
SPACING
A
A
FGEA
G
G
G
B,C B,C
FF
K
K
K
C
G
LL
UNDER CAR PORT etc.
H,I
JD
F
K
2816
MINIMUM SITING DIMENSIONS FOR
FANNED FLUE TERMINALS
POSITION
mm
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 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
TABLE 3
Position Air from Air Direct
of Room or from
Air Vent Internal space Outside
High Vent 326cm2(50in2) 163cm2(25in2)
Low Vent 326cm2(50in2) 163cm2(25in2)Diagram 3.5
3.4 Terminal Guard
A terminal guard is required if persons could come into contact
with the terminal or the terminal could be subject to damage.
If a terminal guard is required, it must be positioned to provide
aminimumof50mmclearancefromanypartoftheterminaland
be central over the terminal.
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
documentIGE/UP/7/1998. Ifindoubtseekadvicefromthelocal
gas undertaking or Hepworth Heating Ltd.
3.6 Room Ventilation
The boiler is room sealed, so when it is installed in a room or
space, a permanent air vent is not required.
3.7 Cupboard or Compartment Ventilation
If the boiler is to be fitted in a cupboard or compartment,
permanent high and low level air vents must be provided in
accordancewiththerulesinforceinthecountriesofdestination.
The vents must have at least the effective areas as given in
Table 3.

Supplied By www.heating spares.co Tel. [phone]
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221473B
Diagram 4.1
Diagram 4.1A
4462
4463
AVAILABLE PUMP HEAD
SYSTEM DIFFERENTIAL TEMPERATURE
SYSTEM HEATING LOAD
*
0
5
10
15
17
20
11
40
35
30.6
25
19.8
15
10
5
0
F
0
C
0
0
15
30
40
50
60
0
1
2
3
5
10
16
14
4
10
12
5
FEET
4.5
4.03.53.0
2.5 5.0 GALLONS/Min
LITRES/Min
FLOW RATE
18
1715
13
11 19 20 22 23
Btu/h x
1000 kW
21
ACCEPTABLE
DIFFERENTIAL
RANGE
*
P
U
M
P
C
U
R
V
E
-
S
E
T
T
I
N
G
3
P
U
M
P
C
U
R
V
E
-
S
E
T
T
I
N
G
2
REMAINING CONVEYING CAPACITY OF PUMP
SHOWING RELATIVE SYSTEM DIFFERENTIAL AT
VARIOUS SYSTEM HEATING LOADS.
M
4 Heating System
GRUNDFOS
WILO
AVAILABLE PUMP HEAD
SYSTEM DIFFERENTIAL TEMPERATURE
SYSTEM HEATING LOAD
*
0
5
10
15
17
20
11
40
35
30.6
25
19.8
15
10
5
0
F
0
C
0
0
15
30
40
50
60
0
1
2
3
5
10
16
14
4
10
12
5
FEET
4.5
4.03.53.0
2.5 5.0 GALLONS/Min
LITRES/Min
FLOW RATE
18
1715
13
11 19 20 22 23
21
ACCEPTABLE
DIFFERENTIAL
RANGE
*
P
U
M
P
C
U
R
V
E
-
S
E
T
T
I
N
G
2
/
W
I
L
O
S
E
T
T
I
N
G
REMAINING CONVEYING CAPACITY OF PUMP
SHOWING RELATIVE SYSTEM DIFFERENTIAL AT
VARIOUS SYSTEM HEATING LOADS.
M
- Setting 2- Setting 1
P
U
M
P
C
U
R
V
E
-
S
E
T
T
I
N
G
1
/
W
I
L
O
S
E
T
T
I
N
G
Btu/h x
1000 kW

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13 221473B
4 Heating System
4.1 General Notes
The boiler is for use in sealed water systems only.
4.2 Safety Valve
Thesafetyvalve isan integralpart oftheboiler andit cannotbe
adjusted.
4.3 Pressure Gauge
A pressure gauge is incorporated into the boiler to indicate the
system pressure.
4.4 Pump
The circulation pump is integral with the boiler.
The remaining circulating pressure head available from the
boiler is shown in diagram 4.1, Grundfos or 4.1A Glow-worm
Wilo.
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
expansionvesselrangesfrom119Litreswithacoldfillpressure
of0.7bar, to 98Litres with a cold fill pressureof 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” shown in the flow in diagram 4.2. This valve
must be lockable and positioned so that inadvertent closure or
unauthorisedinterferenceisnotpossible. Thedesigndifferential
can be between 11°C (20°F) and 17°C (30°F), dependent on
the system resistance and the available pump head.
Grundfos Pump
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.
Tousediagram4.1start withtherequiredheatingsystem load.
In the example shown the maximum boiler output has been
chosen, 17.6kW (60,000Btu/h).
Draw a horizontal line from the required system differential
temperatureaxistointersectthecurve. Intheexample11°C
(19.8°F) has been chosen, shown . At the point
of intersection draw a vertical line to cross the pump curve.
From this point draw a further horizontal line to determine the
availablepumphead. Intheexample1.9m(6ft3in)isavailable.
A greater pump head can be achieved by choosing a higher
systemdifferentialtemperature,uptoamaximumof4.0m(13ft)
at a system differential of 17°C (30.6°F). The system must be
designed such that the available pump head is not exceeded.
If the heating system load is less than 13.2kW (45,000Btu/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.
Glow-worm Wilo Pump
The pump adjuster should normally be left at maximum (2) but
in some cases it is permissible to adjust to a lower setting (1),
see diagram 4.1A.
To use diagram 4.1A start with the required heating system
load.
In the example shown the maximum boiler output has been
chosen, 17.6kW (60,000Btu/h).
Draw a horizontal line from the required system differential
temperatureaxistointersectthecurve. Intheexample11°C
(19.8°F) has been chosen, shown . At the point
of intersection draw a vertical line to cross the pump curve.
From this point draw a further horizontal line to determine the
available head. In the example 1.9m (6ft3in) is available. A
greater pump head can be achieved by choosing a higher
systemdifferentialtemperature,uptoamaximumof4.0m(13ft)
at a system differential of 17°C (30.6°F). The system must be
designed such that the available pump head is not exceeded.
If the heating system load is less than 13.2kW (45,000Btu/h)
then it is permissible to adjust the pump setting to (1),
shown . This results in an available pump
head of 4.2m (13ft9in). This is the maximum that can be
achieved with the pump at this setting.
4.7 Bypass
Itis ESSENTIALthat abypass of22mm odminimum isfitted 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 should be made for replacing water lost from the
systemusingamakeupbottlemountedinapositionhigherthan
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.
4.9 Filling Sealed Systems
Provision for filling the system at a low level must be made.
Three methodsof filling are shownin diagram 4.3. Theremust
be no permanent connection to the mains water supply, even
through a non return valve.
NOTE:Itisimportantthatfittingsusedforconnectiontopotable
water comply with the water undertakers requirements.
4.10 Corrosion Inhibitor
Ifaninhibitoristobeusedinthesystem,contactamanufacturer
so 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,
thenthoroughly cleaning outbefore 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.

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14
221473B
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
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)
Diagram 4.3
3132
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
For the minimum and maximum working pressures of the
domestic hot water circuit of the boiler, refer to Section 1.6
‘Data’.
If the cold water supply pressure exceeds the maximum, a
pressurereducingvalvemustbefittedinthesupplytotheboiler
to reduce the pressure to within the limits given.
Diagram 4.2
2818
4 Heating System
5.3 “Hard” Water Areas
In areas where the water is “hard”, that is, more than 200mg/
litre,itis recommendedthat aproprietaryscale reduceris fitted
inthecoldsupplytotheboiler. Checkthetotalwater“hardness”
using the kit supplied, in the door, following the instructions
given. Consultthelocalwaterundertakingforadditionaladvice.
A double check valve assembly must be fitted upstream of the
scalereducer. Fortherelativepositionofthescalereducerand
pressurereducingvalve,ifrequired,refertothemanufacturer’s
instructions.
5 Domestic HotWater System

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6.1 Unpacking
Removethetopcartonandcutoutthefluetemplatefromthe
inner flap.
Open the control door, see diagram 6.1.
Removethetwoscrewssecuringtheoutercaseandthenlift
it at the top and pull it forwards and off, see diagram 6.1.
Remove the cover of the inner case, secured with four
screws, see diagram 6.2
Disconnect the gas cock union and the front unions of the
isolation valves, see diagram 6.3.
Slightly loosen the clips of the gas service cock and the
isolating valves.
Remove the two boiler securing screws then remove the
boilerfromthemountingframe,bypullingthestudsfromthe
clips and unhooking it at the top.
6.2 Marking
The boiler mounting frame is the same width as the boiler
but the flue connection sticks out above it.
Place the boiler mounting frame on the wall in the required
position,seediagram 2.1to maintainminimum clearances.
Make sure that the isolation valves are at the bottom facing
forwardsand that the frame top is horizontal, thenmark the
fourwallfixingpointsthroughtheholesinthetwohorizontal
straps.
Positionthefluetemplateonthewall,thearrowpointsonthe
centres of the two upper fixing points previously marked,
see diagram 6.4 which also shows dimensions.
Forrear flue, mark the rear flue position asrequired, centre
and/or diameter.
For a side flue, mark the horizontal flue centre line at the
sidesofthetemplate. Extendthefluecentrelinehorizontally
left or right to the internal corner where the flue is required
to exit to outside. Mark the position of the circular hole, on
theflueexitwall,usingthedimensionsgivenindiagram6.5.
Fromthefluepositionmarks,checkthattheflueterminalwill
be in a suitable position, see diagram 3.6.
6.3 Flue Hole Cutting
Cut the hole horizontally in the wall, to the diameter shown
in diagram 6.4, using, preferably, a core drill.
6 Installation Preparation
Diagram 6.2
INNER
CASE
COVER
SECURING
SCREW (4)
PILOT
WINDOW
SCREW (2)
DATA LABEL
Diagram 6.3
6957
LOCATION
CLIPS
CLIP (5)
SECURING SCREW (2)
UNIONS (5)
6622
RESET SWITCH AND NEON
INDICATOR
Diagram 6.1
OUTER CASE
OUTER CASE SECURING
SCREW (2)
DOOR
CLOCK TIMER
IF FITTED
5040
CENTRAL
HEATING
SELECTOR
SWITCH

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16
221473B
7.1 Flue Length
Forarearflue,measurethedistancefromtheoutsidewall face
to the boiler mounting wall. Check that the flue length will be
suitable,seediagram3.1forastandardfluesystemordiagram
3.3 for a long flue system.
Forasideflue,measurethedistancefromtheoutsidewallface
to the side of the boiler mounting frame. Check that the flue
length will be suitable, see diagram 3.2 for a standard flue
system or diagram 3.4 for a long flue system.
All long flue systems are installed in a similar manner to the
standard flue.
7.2 Rear Flue
Mark the air duct assembly and the flue duct at the lengths
shown in diagram 7.2 then cut to length, cutting square and
removing any burrs.
Markaline34mmfromtheendoftheflueduct,seediagram7.4.
7.3 Side Flue
Mark the air duct assembly and the flue duct at the lengths
shown in diagram 7.3 then cut to length, cutting square and
removing any burrs.
Markaline34mmfromtheendoftheflueduct,seediagram7.4.
Diagram 6.4 Diagram 6.5
2882
2304
FLUE
CENTRE
LINE
CORNER
(Left Flue)
CORNER
(Right Flue)
115Dia.
168 168
6 Installation Preparation
FLUE
TEMPLATE
(Cut from
carton top
inner flap)
TOP OF
BOILER
MIN.
CLEARANCE
87
104
115Dia.
584
480
300
FLUE
CENTRELINE
BOILER
MOUNTING FRAME
FIXINGS POINTS
C
L
C
L
6.4 Wall Sleeve
Note:If required, an optional WallLiner Kit, PartNo.900862, is
available, complete with fixing instructions.
6.5 Boiler Mounting Frame Fixing
Position the flue template over the flue hole and check the
position of the wall fixing points. Mark the position of the fixing
holes again, if required.
Drill the four fixing holes and insert wall plugs to suit
No.10x50mm long screws.
Secure the boiler mounting frame to the wall using
No.10x50mm long screws.
7 Flue Preparation
Diagram 7.2
REAR DUCT
2823
X + 165
( AIR DUCT ASSEMBLY)
X + 115
( FLUE DUCT )
X
BOILER
MOUNTING
WALL
OUTSIDE
WALL FACE
FLUE DUCT
FLUE
TERMINAL
63
2884
OUTSIDE
WALL FACE Diagram 7.1FLUE TERMINAL

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17 221473B
7 Flue Preparation
Diagram 7.3
SIDE DUCT -STANDARD FLUE
Y
Y + 209
(AIR DUCT
ASSEMBLY)
SIDE
OF
BOILER
MOUNTING
FRAME
OUTSIDE
WALL
FACE
Y + 172
(FLUE DUCT)
2824
2825
CLIP
MARK LINE
34mm
STANDARD FLUE ILLUSTRATED Diagram 7.7
WALL
LINER
FLUE
TERMINAL
AIR
DUCT
OUTSIDE WALL FACE
SEAL
2302
STANDARD FLUE ILLUSTRATED Diagram 7.6
3.3 DIA
HOLE IN EACH SIDE
OF THE AIR DUCT
2827
AIR BOX
SCREW (2)
FLUE
TERMINAL
AIR DUCT
FLUE DUCT
TAPE
Diagram 7.5
2826
AIR BOX / FLUE
ASSEMBLY
SECURING
NUT (4) AIR DUCT
AIR BOX
WASHER (4)
AIR BOX
SPIGOT
PLATE
STANDARD FLUE
AIR DUCT
FLUE DUCT
Diagram 7.4
FLUE
DUCT
SPACER
FLUE ELBOW - Excercise
caution when handling this
component (push onto, flue
duct up to the line)
7.4 Flue Assembly
Fit and secure the flue elbow, see diagram 7.4.
Insert the flue and spacer into the air duct.
Fit the air box spigot plate in the correct position on the air box
according to left, right or rear flue.
Fittheairandflueductassemblytotheboiler,seediagram7.5.
Note: Fullyinserttheairduct intotheairbox spigot. Makesure
the flue terminal is in the correct orientation, marked TOP and
the flue duct is engaged in the flue terminal.
Drill a hole, diameter as shown in diagram 7.6, in each side of
theairduct,throughtheholesintheairbox. Securetheairduct
to the air box using the two screws provided in the loose items
pack.
Note: If side or front access is restricted then it may be
necessary to carry out the above operation after passing the
flue through the wall.
Sealaround thejoint betweenthe airduct andthe airbox using
the tape provided in the loose items pack.
Placetheflueassemblyinto thefluehole,tomake sure thatthe
flue terminal is correctly positioned and sticking out the correct
distance from the outside wall face, see diagram 7.1 and the
appropriate diagram 7.2 or 7.3.
Remove flue assembly.
7.5 Internal Access Flue
If access to the outside wall surface is not practical, the flue
system can be installed from inside. Use of the optional wall
liner kit is required, see diagram 7.7.

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221473B
Diagram 8.2
2828
BOILER
MOUNTING
FRAME
'NOTCH' MARKING POSITION OF
SAFETY VALVE DISCHARGE
GAS
SERVICE
COCK
Diagram 8.1
DOMESTIC
WATER CENTRAL HEATING
NOTE:
KEEP ANY PIPEWORK
CLEAR OF SHADED AREA
MINI
EXPANSION
VESSEL
EXPANSION
VESSEL
POSITION
320mm
46mm
20mm
120mm
115mm
CENTRAL
HEATING
RETURN
DOMESTIC
HOT
WATER
OUT
CENTRAL
HEATING
FLOW
DOMESTIC
COLD
WATER
SUPPLY IN
SLOT
(CLOSED)
2297
DRAIN POINT
SLOT (CLOSED)
63
8 Gas and Water Connections
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 or remove the clip, as desired, whilst
making the connection. Do not subject the gas service cock to
heat.
8.2 Water Connections
Provision is made for the water connections to be made from
below or through an internal wall at the rear of the boiler, see
diagram 8.1 for position.
Provisionismadeforthedomestic hot wateroutletandheating
flow and return pipes to be connected from above, if desired,
passing down either side of the boiler, see diagram 8.2 for
clearances. Take care that any pipework connected from
above,withintheboilermountingframewillcleartheexpansion
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
straightconnector and heatingsystems byway ofthe isolating
valves, see diagram 8.1.
Slacken or remove the clips, as desired, while making the
connections. Donotsubject anyof theisolating valvestoheat.
Make sure that the drain points on the isolating valves are
positionedtowardsthefrontoftheboiler,alsothatthedrainand
operating screw heads are accessible.
8.3 Safety Valve Discharge
WARNING. Itmustnotdischargeaboveanentranceorwindow
or any type of public access area.
A short discharge pipe is supplied loose with the boiler, which
when 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, in a visible position, outside the building, facing
downwards, preferably over a drain
Thepipemusthaveacontinuousfallandberoutedtoaposition
sothatanydischargeofwater,possiblyboiling,orsteamcannot
create any danger to persons, damage to property or external
electrical components and wiring.
Note. To ease future servicing it is advisable to use a
compression type fitting to extend the discharge pipe.

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19 221473B
9 Electrical Connections
Diagram 9.1
2643
RED LINK
Remove when
connecting any
heating system
controls.
CABLE
CLAMP
MAINS
CABLE
COVER
SCREW (2)
1
2
3
N
L
E
9.1 Supply Cable Connection
CAUTION. To prevent an induced current from switching the
central heating on, when not required, it is important that the
heating system control cables are separated from the other
mains supply cables.
The boiler requires a permanent mains supply through an
isolator which must also isolate any heating system controls,
see diagram 9.2.
Any heating system controls must not interrupt the permanent
mains supply to the boiler.
Remove the electrical connector from the loose items pack.
Remove the two screws and cover from the connector, see
diagram 9.1.
Using PVC cable of suitable length and rating as stated in
Section1.8,connectthemainssupplycabletotheappropriate
terminals of the connector, see diagram 9.2.
Standard colours are, Brown - Live; Blue - Neutral; Green and
Yellow - Earth.
Themainscableouterinsulationmustnotbecutbackexternal
to the plug, see diagram 9.1.
Make the earth cable of a greater length so that if the cable is
strainedtheearthwouldbethelastto becomedisconnected.
CAUTION. It is essential that the polarity is correct.
9.2 Heating System Controls
CAUTION: To prevent an induced current from switching the
central heating on, when not required, it is important that the
heating system control cables are separated from the other
mains supply cables.
The heating system should have installed: a programmer and
room thermostat controlling the boiler.
Thermostaticradiatorvalvesmaybeinstalledinadditiontothe
room thermostat.
Note: For further information, see The Building Regulations
1991-Conservationoffuelandpower,1995edition-Appendix
G, table 4b.
If electrical controls are not to be used to regulate the heating
system, do not disturb the red link cable.
Whenanyformofelectricalcontrolisbeingusedtoregulatethe
heatingsystem,removetheredlinkcableandconnectheating
system controls in series.
Themainscableouterinsulationmustnotbecutbackexternal
to the plug.
9.3 Clock/Timer Kit
Aninternalclock/timerkitcanbesupplied,refertotheliterature
supplied with it.
9.4 Frost Thermostat
If the installation requires protection by a “frost thermostat”,
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 9.1.

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221473B
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
Diagram 9.2
EXTERNAL CLOCK
INTEGRAL CLOCK
INTEGRAL CLOCK
INTEGRAL CLOCK
INTEGRAL CLOCK
INTEGRAL CLOCK
9 Electrical Connections
5217