Supplied By www.heating spares.co Tel. 0161 620 6677
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 1.3.
CE Mark
This boiler meets the requirements of Statutory Instrument No. 3083 The boiler (Efficiency) Regulations, and therefore is deemed
to meet the requirements of Directive 92/42/EEC on the efficiency requirements for new hot water boilers fired with liquid or gaseous
fuels.
Type test for purposes of Regulation 5 certified by: Notified body 0086.
Product/productioncertifiedby: Notified body 0086.
The CE mark on this appliance shows compliance with:
1. Directive 90/396/EEC on the approximation of the laws of the Member States relating to appliances burning gaseous fuels.
2. Directive 73/23/EEC on the harmonization of the Laws of the Member States relating to the electrical equipment designed
for use within certain voltage limits.
3. Directive 89/336/EEC on the approximation of the Laws of the Member States relating to electromagnetic compatibility.
INFORMATION FOR THE INSTALLER AND SERVICE ENGINEER.
Under Section 6 of The Health and Safety at Work Act 1974, we are required to provide information on substances hazardous to
health.
Insulation and Seals
Ceramic fibre and glass fibre are used in insulation panels, rope and gaskets. The 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.
Thermostat
This contains a very small amount of xylene in the sealed phial and capillary. If broken, under normal circumstances the fluid does
not cause a problem, but in cases of skin contact, wash with cold water.
If swallowed drink plenty of water and seek medical attention.
CONTENTS DESCRIPTION SECTION PAGE No.
INSTRUCTIONS
FOR USE
INSTALLATION
INSTRUCTIONS
Introduction3
Lighting the Boiler4
General Data15
Flue & Ventilation27
Water Systems38
Flue and Appliance Preparation410
Boiler Installation512
Gas and Water Connection613
Electrical Wiring713
Commissioning814
Instructions to User916
SERVICING
INSTRUCTIONS
221481C
Servicing and Replacement Parts1016
Fault Finding1119
Spare Parts1224
2
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Instructions for Use
General Notes and information
Please read these instructions and follow them carefully for the
safe and economical use of your boiler
IMPORTANT NOTICE
This boiler is for use only on G20 gas.
The Gas Safety (Installation and Use)
Regulations
In your own interests and that of safety it is the Law that ALL gas
appliances are installed by a competent person in accordance
with the above regulations.
Gas Leak or Fault
If a gas leak or fault exists or is suspected the boiler must be
turned off.
Advice/help should be obtained from your installation or servicing
company or the local gas undertaking.
Protection Against Freezing
If the boiler is to be out of use for any long period of time during
severe weather conditions we recommend that the whole of the
system, including the boiler be drained off to avoid the risk of
freezing up. If an immersion heater is fitted to the domestic hot
water cylinder make sure it is switched off.
If in doubt contact you installation or servicing company,
especially if you have a sealed water system.
Boiler Spaces
The boiler must be positioned so that at least the minimum
operational and servicing spaces are provided, see diagram 1.
If fixtures are placed close to the boiler they should be made
removable for access.
Sufficient space must be left in front of the boiler for servicing.
Boiler in a Compartment
If the boiler is fitted in a compartment or a cupboard purpose
built ventilation must be provided and kept clear. Do not use the
enclosed space for storage.
Overheat Safety Device
The boiler is fitted with a safety cutoff device to prevent damage
through overheating. Should the burner or pilot go out for no
apparent reason, allow the system to cool down, then relight the
boiler.
Should the problem persist, turn the boiler off and contact your
installation or servicing company.
Maintenance
To ensure the continued efficient and safe operation of the
boiler it is recommended that it is checked and serviced at
regular intervals. The frequency of servicing will depend upon
the particular installation and usage, but in general once a year
should be enough.
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.
It is the Law that servicing is carried out by a competent person.
To obtain service, please call your installer or Heatcall (Glow-
worm’s own service organisation) using the telephone number
on the case tray.
Please be advised that the ‘Benchmark’ logbook should be
completed by the installation engineer on completion of
commissioning and servicing.
All CORGI Registered Installers carry a CORGI ID card, and
have a registration number. Both should be recorded in your
boiler Logbook. You can check your installer is CORGI
registered by calling CORGI direct on :- 01256 372300.
Cleaning
WARNING. This appliance contains metal parts (components)
and care should be taken when handling and cleaning, with
particular regard to edges.
Clean the casing by wiping it over occasionally with a damp
cloth or dry polishing cloth.
Do not use abrasive cleaners.
MINIMUM
CLEARANCES
B
A
C
BALANCED FLUE BOILERS
Minimum Clearances from Walls,
Ceiling, Floor, Cupboards, etc.
AL.H. and R.H. side of casing
BTop of casing
CBottom of casing
DFront of boiler
(from a permanent surface)
2399
A
Balanced
Flue
Model
5
75
150
305
CLEARANCES
3
Diagram 1
221481C
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Instructions for Use
Electrical Supply
WARNING. The boiler must be earthed.
Connection of the boiler and any system controls to the mains
supply should be by one unswitched shuttered socket a 3A
plug, both to the current issue of BS1363.
Alternatively, a 3A fused double pole isolating switch may be
used, having a minimum double pole contact separation of
3mm in both poles, serving only the boiler and system controls.
The colours of three core cable are:
Brown - live, Blue - neutral, green and yellow - earth.
As the markings on your plug may not correspond with these
colours, continue as follows:
The wire coloured blue must be connected to the terminal
marked “N” or “Black”.
The wire coloured brown must be connected to the terminal
marked “L” or “Red”.
The wire coloured green and yellow must be connected to the
terminal marked “E”, “Green” or the earth symbol
.
Lighting the Boiler
CAUTION. If the pilot flame goes out, either intentionally or by
accident, no attempt should be made to relight it for at least 3
minutes.
Slide the controls cover off and clear, see diagram 3.
Make sure that the electrical supply to the boiler is switched off.
Identify the controls by reference to diagram 2.
Turn thermostat knob “A” fully anti-clockwise to the OFF
position.
Push and keep in gas control knob “B”.
Push and release igniter button “C” until the pilot burner lights,
look through window “G”. When the pilot is alight keep the gas
control knob “B” pushed in for about 15 seconds.
If the pilot does not light or fails to stay alight, wait for 3 minutes
then repeat the lighting operation only this time keep the gas
control knob “B” pushed in for a little longer.
When the pilot is alight and stable, switch on the electrical
supply to the boiler.
Check that all external controls are calling for heat.
Turn the thermostat control knob “A” fully clockwise to “5” and
the burner will light fully in about 3 to 5 seconds, look through
window “G”.
Adjust thermostat knob to desired setting between “5” and “1”.
“5” is about 82
Replace controls cover.
o
C (180oF).
To Turn the Boiler Off
For short periods, turn thermostat control knob “A” anti-clockwise
until “O” is against the setting point. The pilot will remain alight,
to relight the main burner turn thermostat control knob “A”
clockwise to the desired setting between “1” and “5”.
For longer periods, turn the thermostat control knob “A” anticlockwise until “O” is against the setting point. Slide the control
button “B” to the left, the control will automatically reset. Switch
off the electrical supply to the boiler.
To relight, follow the full lighting procedure given above.
CONTROL
COVER 'D'
CONTROLS ACCESSDiagram 2
2391
G
A.BOILER THERMOSTAT KNOB
B.GAS CONTROL KNOB
C.IGNITER BUTTON
G.VIEWING WINDOW
A
C
BOILER
CONTROLS
221481C
4
2431
B
MODEL AND
SERIAL NUMBER LABEL
Diagram 3
Supplied By www.heating spares.co Tel. 0161 620 6677
1 General Data
RETURN
H
WATER
CONNECTIONS
FLOW
K
G
L
J
WATER
CONNECTIONS
C
L
M
FLUE
F
D
GAS
CONNECTION
C
GAS
CONNECTION
E
P
B
A
R
GENERAL ARRANGEMENT
ModelABCDEFGHJKLMNPR
2411
N
Diagram 1.1
3027820406001104901117022530043133320 41498
Important Notices
This boiler is for use only on G20 gas.
This boiler is suitable for fully pumped systems only.
Wherever possible, all materials, appliances and components
to be used shall comply with the requirements of applicable
British Standards.
Where no British Standard exists, materials and equipment
should be fit for their purpose and of suitable quality and
workmanship.
Sheet Metal Parts
WARNING. When installing or servicing the boiler care should
be taken when handling sheet metal parts, to avoid any possibility
of personal injury.
1.1 Statutory Requirements
The installation of the boiler must be carried out by a competent
person in accordance with the relevant requirements of the
current issue of:-
The Gas Safety (Installation and Use) Regulations, The Building
Regulations, The Building Standards (Scotland) Regulations
(applicable in Scotland), Local Water Company Bye-laws, The
Health and Safety at Work Act, Control of Substances Hazardous
to Health, The Electricity at Work Regulations and any applicable
local regulations.
Detailed recommendations are contained in the current issue of
the following British Standards and Codes of Practice:-
BS6798, BS5440 Part 1 and 2, BS5546 Part 1, BS5449,
BS6891, BS7074 Part 1 and 2, BS7593, BS7478, BS7671.
Manufacturer’s notes must not be taken in any way as overriding
statutory obligations.
TABLE 1.
TOTAL
WEIGHT
WATER
CONTENT
GAS
CONNECTION
WATER
CONNECTION
ELECTRICITY
RATING
ELECTRICITY
SUPPLY
DATA LABEL
INJECTOR
The Seasonal Efficiency Domestic Boilers UK (SEDBUK) is
71.3%.
The value is used in the UK Government’s Standard Assessment
Procedure (SAP) for energy rating of dwellings. The test data
from which it has been calculated have been certified by B.S.I.
ECONOMY PLUS
22.6kg
(49.8lb)
0.45litre
(0.10gal)
Rc 1/2 (1/2 in. BSPT)
22mm copper,
flow at right, return at left
45W, internal fuse F1A
240V~50Hz Fused 3A
Bottom of inner case door
2.8 - Cat 30 - 850
DATA
5
221481C
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1 General Data
1.2 Range Rating
The boiler is range rated and may be adjusted to suit individual
system requirements.
The respective Table 2 gives the ratings and settings.
1.3 B.S.I. Certification
The boiler is certificated to the current issue of British Standard
6332 Part 1, invoking the current issue of BS5258 Part 1 for
performance and safety. It is, therefore, important that no
alteration is made to the boiler without permission, in writing,
from Hepworth Heating Ltd.
Any alteration that is not approved by Hepworth Heating Ltd.,
could invalidate the B.S.I. Certification, the warranty and could
also infringe the current issue of the Statutory Requirements.
1.4 Gas Supply
The gas installation shall be in accordance with the current
issue of BS6891.
The supply from the governed meter must be of adequate size
to provide a steady inlet working pressure of 20mbar (8in wg) at
the boiler.
On completion test the gas installation for soundness using the
pressure drop method and a suitable leak detection fluid, purge
in accordance with the above standard.
1.5 Electrical Supply
WARNING. This boiler must be earthed.
All system components shall be of an approved type and shall
be connected in accordance with the current issue of BS7671
and any applicable local regulations.
Connection of the boiler and system controls to the mains
supply must be through a common isolator and must be fused
3A, maximum. This method of connection should be, preferably,
an unswitched shuttered socket outlet and 3 pin plug both to the
current issue of BS1363.
Alternatively, a double pole isolating switch may be used,
provided it has a minimum contact separation of 3mm in both
poles. The isolator should be clearly marked, showing its
purpose. See also Section 1.11.
Wiring to the boiler must be insulated PVC flexible type to the
current issue of BS6500 Table 16 not less than 0.75mm
0.20mm).
2
(24/
1.6 Contents of Packaging
The boiler is delivered in one pack.
The other pack contains the balanced flue terminal assembly
and accessories.
Refer to Section 2 to check that the flue terminal assembly
supplied is suitable.
1.7 Water System
The boiler may be fitted to an open vented or sealed system, see
Section 3 for further details.
1.8 Draining Tap
A draining tap must be provided at the lowest points of the
system which will allow the entire system, boiler and hot water
cylinder to be drained off.
The boiler is provided with a drain tap for heat exchanger
draining.
Draining taps shall be to the current issue of BS2879.
1.9 Safety Valve
A safety valve need not be fitted to an open vented system.
1.10 Location
This boiler is not suitable for outdoor location.
The boiler may be installed in any room, although particular
attention is drawn to the requirements of the current issue of
BS7671 with respect to the installation of a boiler in a room
containing a bath or shower. Any electrical switch utilising
mains electricity should be so situated that it cannot be touched
by a person using the bath or shower. The electrical provisions
of the Building Standards (Scotland) Regulations are applicable
to such installations in Scotland.
The boiler must be mounted on a flat wall which is sufficiently
robust to take its weight.
1.11 Boiler Location
Refer to diagram 1, Instructions for Use.
The boiler must be positioned so that at least the minimum
operational and servicing clearances are provided.
Additional clearances may be required for installation.
If fixtures are positioned next to the boiler they should be made
removable for access to pipework.
1.12 Heating System Controls
The heating system should have installed: a programmer and
room 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 - Conservation of fuel and power, 1995 edition - Appendix
G, table 4b.
TABLE 2.
RANGE RATING
NOMINAL
HEAT INPUT
(GROSS)
NOMINAL
HEAT
OUTPUT
BURNER
SETTING
PRESSURE
kW
Btu/h
kW
Btu/h
m bar
in. w.g.
7.335.868.79
25,00020,00030,000
7.24.710.5
2.91.94.2
Max.Min.Med.
-7.3310.99
-25,00037,500
221481C
6
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2 Flue and Ventilation
2.1 Terminal Position
The minimum acceptable spacings from the terminal to
obstructions and ventilation openings are as shown in diagram
2.1.
Where the terminal is fitted within 850mm (34in) below plastic
guttering or within 450mm (18in) of painted eaves or painted
gutters an aluminium shield 750mm (2ft6in) long should be
fitted to the underside and immediately beneath the guttering/
eaves.
2.2 Terminal Protection
A terminal guard is required if persons could come into contact
with the terminal or the terminal could be subject to damage.
If a 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.
Check the wall thickness.
The standard flue set supplied is suitable for wall thickness
238mm to 330mm.
For other wall thicknesses, kits are available.
76 to 238mm- Kit 443235
324 to 580mm- Kit 443236
2.4 Boilers in a Compartment
Where the installation of the boiler will be in an unusual location,
special procedures are necessary, the current issue of BS6798
gives detailed guidance.
A compartment used to enclose the boiler must be designed
and constructed specifically for this purpose. An existing
cupboard or compartment modified for the purpose may be
used. Details of essential features of cupboard or compartment
design are given in the current issue of BS6798.
The doorway opening must be of sufficient size to allow for easy
removal of the boiler.
Where the boiler is fitted in a cupboard or compartment,
permanent high and low level ventilation must be provided. The
minimum ventilation areas required are given in the respective
Table 5.
2.5 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. If in doubt seek advice from the local
gas undertaking or Hepworth Heating Ltd.
MINIMUM SITING DIMENSIONS FOR
BALANCED FLUE TERMINALs POSITION
A DIRECTLY BELOW AN OPENABLEmm
WINDOW, AIR VENT, OR ANY OTHER
VENTILATION OPENING300
B BELOW GUTTER, DRAIN/SOIL PIPE300
C BELOW EAVES300
D BELOW A BALCONY OR CAR PORT600
E FROM VERTICAL DRAIN PIPES AND
SOIL PIPES75
F FROM INTERNAL OR EXTERNAL CORNERS600
G ABOVE ADJACENT GROUND OR
BALCONY LEVEL300
H FROM A SURFACE FACING THE TERMINAL600
I FACING TERMINALS600
J FROM OPENING (DOOR/WINDOW) IN CAR
PORT INTO DWELLING1200
K VERTICAL FROM A TERMINAL1500
L HORIZONTALLY FROM A TERMINAL300
MINIMUM
SPACING
Diagram 2.1
TABLE 5. COMPARTMENT AIR VENTS
2
in
LOW LEVEL
VENT AREA
2
cm
in
VENTILATION
REQUIREMENTS
HIGH LEVEL
VENT AREA
2
cm
VENTILATION
FROM ROOF
10016100
16
OR SPACE
2
7
VENTILATION
FROM
OUTSIDE
50
8
508
221481C
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3 Water Systems
Notes:
PUMP
The pump should be fitted in the flow pipework from the boiler,
with valves each side, integral if possible, it should produce a
temperature difference across the boiler of 11oC (20oF).
Flow rates should be,
11.5 Litre/min (2.5gal/min)
See diagram 3.1 for pressure loss across the boiler.
High resistance microbore systems may require a higher duty
pump.
BYPASS
The flow through the boiler must not be allowed to fall below,
7.8 Litre/min (1.7gal/min) whilst the burner is alight.
A bypass must be fitted.
3.1 Open Vented Systems
Water system
For an open vented system the boiler must be supplied from an
unrestricted water supply taken from a feed and expansion
tank, situated at a maximum height of 27.5metres (90ft) above
the boiler.
The cold feed supply must be 15mm minimum size.
It is important that the relative positions of the pump, cold feed
and open vent are as shown in diagram 3.2.
3.2 Cylinder
SINGLE FEED SELF PRIMING CYLINDERS ARE NOT
RECOMMENDED.
The hot water cylinder must be a double feed fully indirect type.
GALLONS / MINUTE
1
0.7
0.6
0.5
0.4
0.3
0.2
(m head of water)
WATER PRESSURE LOSS
0.1
0
0
5
LITRES / MINUTE
PRESSURE LOSS OF BOILER
ECONOMY
450mm
MIN.
HEIGHT
2
3
25
20
15
10
5
0
1015
Diagram 3.1
Open (vented) system.
Recommended
relationship between
pump, cold feed and
vent.
22 mm (MIN) VENT
FEED AND
EXPANSION
CISTERN
15mm (MINIMUM)
COLD FEED
2761
(m head of water)
WATER PRESSURE LOSS
0392
3.3 Inhibitor
Attention is drawn to the current issue of BS5449 and BS7593
on the use of inhibitors in central heating systems.
If an inhibitor is to be used, contact a manufacturer for their
recommendations for the best product to use.
When fitting the boiler into an existing system take special care
to drain the entire system including the radiators, then thoroughly
cleaning out before fitting the boiler whether or not adding an
inhibitor.
Sealed Water Systems
The installation should comply with the appropriate requirements
of the current issue of BS4814, BS5449 BS6759 BS6798 and
BS7074 Part 1 and 2.
See diagram 3.3 for a suggested layout.
3.4 Safety Valve
A safety valve must be fitted to a sealed water system.
It shall be preset, nonadjustable with a lift pressure of 3bar,
incorporating seating of a resilient material, a test device and a
connection for drain.
The drain from the safety valve must be routed clear of any
electrical fittings and positioned so that any discharge can be
seen.
1150mm
MIN.
150
mm
MIN.
BOILER
15mm (MINIMUM)
BY-PASS WITH
LOCKSHIELD VALVE
ALTERNATIVE
PREFERRED
PUMP
150mm
MAX
RET.
RET.
CYLINDER
FLOW
Diagram 3.2
FLOW
HEATING
221481C
8
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3 Water Systems
(Make-up
alternatives)
3 LITRES (0.66 gals)
MAKE-UP BOTTLE
(if required)
NON-RETURN
VALVE
HEATING
CIRCUIT
AUTO
AIR
VENT
FLOW
RETURN
DRAIN
COCK
BOILER
15mm (min)
BY-PASS WITH
LOCKSHIELD
VALVE
SAFETY
VALVE
AIR
RELEASE
POINT
FILLING POINT
CIRCULATING
PUMP
PRESSURE
GAUGE
EXPANSION
VESSEL
5812
SEALED WATER SYSTEM
DIAGRAMATIC LAYOUT
3.5 Expansion Vessel
A diaphragm type expansion vessel, conforming to the current
issue of BS4814 (see also the current issue of BS7074 Part 1
and 2) must be connected at a point close to the inlet side of the
circulating pump, see diagram 3.3, unless laid down differently
by the manufacturer.
The expansion vessel volume depends on the total water
system volume and the initial system design pressure. For any
system an accurate calculation of the vessel size is given in the
current issue of BS7074 Part 1.
Example, for an initial system design pressure of 0.7bar, the
minimum total vessel volume required is 0.063xTotal System
volume.
Note, a higher initial design pressure requires a larger volume
expansion vessel.
Guidance on vessel sizing is also given in the current issue of
BS5449 and BS7074 Part 1.
The charge pressure must not be less than the static head of the
system, that is, the height of the highest point of the system
above the expansion vessel.
The water content of the boiler is given in the Data Table 1.
Diagram 3.3
3.6 Pressure Gauge
A pressure gauge with set pointer and covering at least the
range 0 to 4bar (0 to 60lb/in2) shall be permanently fitted to the
system in a position where it can be seen when carrying out the
filling operation.
9
221481C
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3 Water Systems
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
3.7 Cylinder
SINGLE FEED INDIRECT CYLINDERS ARE NOT SUITABLE.
The hot water cylinder must be of the indirect coil type. It must
be suitable for working at a gauge pressure of 0.35bar above
the safety valve setting.
3.8 Water Make Up
Provision must be made for replacing water lost from the
system. A make up vessel mounted above the highest point of
the system and connected through a non-return valve to the
system on the return side of either the hot water cylinder or
system.
Alternatively, provision for make up can be made by using a
filling loop.
3.9 Filling Sealed Water Systems
Provision for filling the system at a low level must be made.
Three methods of filling are shown in diagram 3.4. There must
be no permanent connection to the mains water supply, even
through a non-return valve.
3132
4.1 Positioning
Place the template, provided, on the wall in the required position
and mark location of the balanced flue hole, see diagram 2.1.
Cut the hole in the wall to accept the wall liner, see diagram 4.1.
Make good any plasterwork at this stage. When dry, select the
liner “G”, see diagram 4.2. Push into the hole until the flange is
flush with the internal wall. Fit the liner “B” from inside so that it is
flush with the outside brickwork. Mark the two liner positions and
remove. Align the marks on the liners and tape them together with
the tape provided.
The wall liner “B” is not required for wall thickness less than length
of duct “G” on the short flue set. For lesser wall thickness than duct
“G” cut the plain end to the required length.
Reposition the template on the wall in line with the wall opening,
or see diagram 4.1.
Mark positions for the three fixing screws.
Drill and plug the fixing holes, suitable for No.10x50mm wood
screws and plugs.
221481C
FILLING SEALED
WATER SYSTEMS
4 Flue and Appliance Preparation
TOP FIXING HOLES
BOILER FIXING DIMENSIONS
10
186
332
228
PREPARED
HOLE IN
WALL
BOILER
C
L
220
Diagram 3.4
281
BOTTOM
46
FIXING
HOLE
Diagram 4.1
2763
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4 Flue and Appliance Preparation
D
A
K
B
J
L
F
E
ATERMINAL ASSEMBLY
BWALL LINER EXTENSION
CCASE SEAL
DFIXING STRAPS
EFLUE HOOD
FOUTLET DUCT
G WALL LINER SLEEVE
HBOILER UNIT
JLUG
KHOLE FOR CORD/STRING
LBOTTOM LOCATION
STANDARD and SHORT FLUEDiagram 4.2
G
C
H
FLUE DUCT
securing screw
LUG
OUTER CASE
SECURING
SCREW
INNER
CASE
OUTER
CASE
LUG
INNER CASE
SECURING
SCREWS (TOP)
OUTER
CASE
INNER
CASE
INNER CASE
SECURING
SCREWS
(BOTTOM)
Diagram 4.3INNER AND OUTER CASING
WING NUT
2407
2769
FLUE
HOOD
TERMINAL
STRAP LUG
HOOK
BOLT
Diagram 4.4
4.2 Appliance Preparation
Remove the controls cover by pulling it forwards and off.
Remove the outer case by undoing the screw at the bottom and
unhooking at the top.
Remove the inner case by undoing the screws at the top and
bottom, see diagram 4.3.
Remove the flue hood by releasing the wing nuts and remove
angle, see diagram 4.4. Lift off flue hood. Remove the two flue
duct screws.
Fit sponge seal “C” around the spigot at the back of the boiler,
adhesive face to the back of the case “H”, see diagram 4.2.
Take the side strips from packaging and hook them over the top
edge of the side panel and secure with a screw at the bottom.
SECURING
ANGLE
11
221481C
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5 Boiler Installation
5.1 External Access Procedure
Fit the slotted straps “D” to the terminal “A” by placing over the
lugs and then bending the lugs to secure, see diagram 4.2.
From the inside fit the wall liner assembly “B” and “G” into the
hole.
Fit the top two fixing screws, allow them to stand proud to
accept the keyhole fixing slots on the boiler.
Mount the boiler and tighten the top screws and fit bottom
screw.
Locate and support the terminal, note, TOP is marked, see
diagram 4.2.
An alternative method of support is to attach a length of cord or
string, to the terminal through the small hole in the top centre of
the baffle, see diagram 4.2. Attach a suitable weight to the free
end of the cord etc. Pass the weight and cord through the hole
in the wall.
Working from the inside, attach the straps to the lugs on the
boiler, see diagram 4.4, bend the lugs and cut off excess strap
length.
Push the flue duct “F” into the terminal with the unflanged end
against the terminal. Ensure that the lower flange duct “F” fits
behind the combustion chamber rear panel. For walls less than
230mm thick cut to required length at the plain end of the duct.
Refit the two screws through the duct flange, but do not over
tighten.
Replace flue hood, securing angle, tie rods and wing nuts.
Refit the inner cover and secure with the screws previously
removed.
5.2 Internal Access Procedure
If required the terminal can be installed from inside the premises.
Fit the slotted straps “D” to the terminal “A” by placing over the
lugs and then bending the lugs to secure, see diagram 4.2.
Fit the top two fixing screws, allow them to stand proud to accept
the keyhole fixing slots on the boiler.
Attach a length of cord to the terminal through the small hole
provided in the top centre of the baffle.
Fit the liner assembly “B” and “G” into the hole through the wall.
Pass the terminal through the wall liner assembly, using the
cord with a suitable weight attached to hold the terminal in
position. NOTE, the terminal TOP is indicated and the flange on
the wall plate is located inside the wall liner assembly.
Hook the appliance onto the screws passing the string and
weight through the air duct in the back of the appliance.
Tighten the two upper screws and fit the bottom screw.
Attach the two slotted straps from the terminal to the two lugs on
the appliance, see diagram, bend lugs to secure. Cut off excess
strap length and remove cord.
Push the flue duct “F” into the terminal with the unflanged end
against the terminal. Ensure that the lower flange duct “F” fits
behind the combustion chamber rear panel. For walls less than
230mm thick cut to required length at the plain end of the duct.
Refit the two screws through the duct flange, but do not over
tighten.
Replace the flue hood, securing angle, tie rods and wing nuts.
Refit the inner cover and secure with the screws previously
Supplied By www.heating spares.co Tel. 0161 620 6677
5 Boiler Installation
5.3 Installing the Long Flue Set
Refer to diagram 5.1.
The flue duct “F”, flue duct extension “K” and flue duct sleeve “J”
need to be assembled together to suit wall thickness.
This assembly is 75mm longer than the wall liner assembly “B”
and “G” already prepared, with a minimum overlap of 40mm at
each joint. Use the tape provided to make a permanent
assembly of these parts.
6 Gas and Water Connection
1
Connect the gas supply to the Rc
The whole of the gas installation, including the meter, should be
inspected, tested for soundness and purge in accordance with
the current issue of BS6891.
Connect the water to the boiler using the nuts and olives
supplied, to BS2871 copper tube.
/2 gas cock.
Push the flue duct assembly into the terminal, with the unflanged
end entering the terminal. Ensure that the lower flange duct “F”
fits behind the rear panel of the combustion chamber.
Refit the two screws through the duct flange, but do not over
tighten.
Replace the flue hood, securing angle, tie rods and wing nuts,
do not over tighten.
Refit the inner cover and secure it with the screws previously
removed.
7 Electrical Wiring
Warning. The boiler must be earthed and have a permanent
mains supply.
7.1 Electrical Connection
To remove the control box release the two screws at the front,
see diagram 7.1 and lower the box until it is clear then push it
backward to disengage the hinge at the rear, see diagram 7.1.
Take care not to damage the thermostat and capillaries.
Thread the mains lead through the clamp in the rear of the
control box cover and connect to the terminal strip.
When making connections, ensure that the earth conductor is
made longer than the others so that it is the last to become
disconnected.
7.2 Pump and External Controls Connections
The pump must be wired into the boiler control box as shown in
diagram 7.2.
Any external controls must only be wired to interrupt the red link
between terminals 9 and SL.
Take the strain relief grommets from the loose items pack.
Place around the external controls and pump connection cables
respectively squeeze the sides of the grommets when pushing
them into the obround holes in the rear of the control box, see
diagram 7.1.
Make sure the supply cable and all external cables are secured.
7.3 Testing
In the event of an electrical fault after installation preliminary
system checks must be carried out, that is, earth continuity,
polarity and resistance to earth, using a suitable multimeter.
STRAIN
SECURING
SCREWS
RELIEF
GROMMET
FASTENER
RETAINING
TERMINAL
STRAP
STRIP
EARTH
POST
CONTROL BOXDiagram 7.1
2420
13
221481C
Supplied By www.heating spares.co Tel. 0161 620 6677
7 Electrical Wiring
BROWN
CIRCULATION
PUMP
240~50Hz
PERMANENT
MAINS SUPPLY
FUSED AT 3A
SWITCHED
CONTROL
TIME SWITCH
PROGRAMMER ETC.
(if fitted)
Remove Red Link
between 9 and SL
when fitting a time
control etc.
(If link is not
removed the
circulation pump
will run constantly.)
WIRING DIAGRAM FOR CONTROL BOX
L
BLUE
N
GRN / YELLOW
BROWN
L
BLUE
N
N
NL98 7
SL
L
SL
BROWN
BLUE
GRN / YELLOW
987
GRN/YEL
CHASSIS
EARTH
POST
BLUE
PURPLE
RED
RED
BROWN
COMBINED THERMOSTAT
AND PUMP OVERUN
GAS VALVE
BROWN
2419
7
3
986
Diagram 7.2
8 Commissioning
A. BOILER THERMOSTATH. GAS RATE ADJUSTMENT SCREW
B. GAS CONTROL KNOBH. (UNDER COVER SCREW)
C. IGNITION BUTTONJ. GAS SERVICE COCK
G. VIEWING WINDOWK. PRESSURE TEST POINT
L. PILOT BURNER ADJUSTMENT SCREW
G
AC
K
H
B
J (SHOWN OFF)
2416
MODEL AND
SERIAL NUMBER
L
221481C
14
Diagram 8.1BOILER COMPONENTS
Supplied By www.heating spares.co Tel. 0161 620 6677
8 Commissioning
8.1 All Systems
Make sure that the system has been thoroughly flushed out with
water without the pump in place. Refit the pump, fill the system
with water, making sure that all the air is properly vented from
the system and pump.
Before operating the boiler check that all external controls are
calling for heat.
8.2 Sealed Water Systems Only
Flush the whole system with cold water without the pump in
place. Refit the pump and fill until the pressure gauge registers
1.5bar (21.5lbf/in2). Clear any air locks and check for water
soundness.
Check the operation of the safety valve, by allowing the water
pressure to rise until the valve opens. The valve should open
within +/-0.3bar (+/-4.3lbf/in2). of the preset pressure. Where
this is not possible, conduct a manual check and test.
Release cold water to initial system design pressure.
The set pointer on the pressure gauge should be set to coincide
with the indicating pointer.
8.3 Initial Lighting and Testing
Refit the outer case, see diagram 4.5.
Identify the controls by reference to diagram 8.1.
Turn the boiler thermostat to “O” the off position.
Remove the gas pressure test point screw “K” and fit a suitable
pressure gauge.
Turn the electrical supply on and check that the pump is
circulating water through the system.
OPEN ALL WINDOWS AND EXTINGUISH ANY NAKED
LIGHTS, PIPES, CIGARETTES etc.
Turn on the main gas supply and purge in accordance with the
current issue of BS6891.
Turn boiler gas service cock “J” to “On”.
Depress control button “B”, keep pressed in and at the same
time operate the piezo unit button “C” until the pilot burner lights.
After the pilot burner lights keep the button “B” depressed for
about 15 seconds. If the pilot burner fails to stay alight a safety
device prevents immediate relighting. Do not attempt to relight
until the safety device has reset. Check the length of the pilot
flame, it should envelop the thermocouple tip as shown in
diagram 10.3. The pilot rate can be adjusted by turning screw
“L” having first removed the gas valve cover, see diagram 8.1.
Test pilot supply connections for gas soundness with a suitable
leak detection fluid.
Fit the outer case, secure with the screws previously removed.
Make sure that the pilot is alight and stable, view through
windows “G”.
Set the boiler thermostat knob “A” between “1” and “5” and
check that the burner lights smoothly. Check the gas connections
for gas soundness with a suitable leak detection fluid.
To set the burner pressure operate the boiler for 10 minutes,
remove the gas valve cover, if not already removed, adjust the
gas pressure by screw “H” until the required pressure is obtained,
see relevant Table 2 for setting pressures.
Align and attach the self adhesive arrow, from the loose items
pack, in the appropriate space beneath the “MIN” and “MAX”
column on the Data label.
Should any doubt exist about the gas rate this should be
checked at the meter, using a stop watch to time at least one
cubic foot of gas consumption.
Remove the pressure gauge and refit the test point screw,
making sure that a gas tight seal is made.
Replace gas valve cover.
8.4 Testing
Check the operation of the flame failure device on the boiler by
turning the gas service cock off, to make sure that the gas valve
shuts down within 60 seconds, indicated by a “click” from the
valve.
8.5 Flushing
Allow the system to reach maximum working temperature and
examine for water leaks.
The system should then be turned off and drained rapidly whilst
hot.
Refill the system and vent all air as before and again checking
for water leaks.
8.6 Adjustment - All Systems
When commissioning the system the boiler should first be fired
with the bypass fully closed on full service, that is, central
heating and domestic hot water. The system should then be
balanced, adjusting the pump and lockshield valve as necessary.
Having achieved a satisfactory condition operate the boiler with
the bypass valve fully closed on minimum load, normally this will
be central heating only with one radiator in the main living area
operating. The valve should be gradually opened to achieve a
flow rate of 7.8 litre/min (1.7gal/min) 30, 10.5 litre/min (2.3gal/
min)40, and 13.2 litre/min (2.9gal/min) 50.
UNDER NO CIRCUMSTANCES SHOULD THIS VALVE BE
LEFT IN THE FULLY CLOSED POSITION.
Operate the boiler again on full service and check the balancing,
making further adjustments as necessary.
If thermostatic radiator valves are fitted care must be taken to
ensure an adequate flow rate when the valves close, refer to the
current issue of BS7478 for guidance.
Refit the controls cover.
8.7 Sealed Water Systems
Sealed water systems should be adjusted to the initial design
pressure and the set pointer repositioned.
15
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9 Instruct User in Correct Operation of the Boiler
Hand the Instructions for Use to the user for their retention.
Instruct and demonstrate the safe and efficient operation of the
boiler, heating system and domestic hot water system.
Advise the user, that to ensure the continued efficient and safe
operation of the boiler it is recommended that it is checked and
serviced at regular intervals. The frequency of servicing will
depend upon the particular installation conditions and usage,
but in general once a year should be enough.
10 Servicing and Replacement of Parts
Servicing and replacement of parts must be carried out by a
competent person.
Before commencing a service or replacing parts isolate the gas
and electrical supplies.
Replacement of parts is in the reverse order to removal unless
stated otherwise.
10.1 Heating Body - Service
Remove the controls cover by pulling it forward and off.
Remove the outer casing by releasing the screw at the bottom
and unhooking at the top.
Remove the inner case by releasing screws at the top and
bottom, see diagram 4.5.
To remove the flue hood, release wing nuts and lift off securing
angle and flue hood, see diagram 10.1.
Remove the combustion chamber front panel by undoing the
wing nut at the bottom front and the four screws securing it to the
combustion chamber sides, see diagram 10.1.
Remove the two screws and washers securing the pilot burner
and shield to the main burner, see diagram 10.2.
Pull the pilot assembly forward enough to allow the main burner
to be freed from the injector. Raise the burner up at the front,
withdraw forward. Take care not to damage the insulation and
the pilot burner and electrode assemblies.
Place a sheet of paper in the combustion chamber and brush
away any deposits.
Remove the paper and debris.
WING NUT (2)
SECURING ANGLE
FLUE
HOOD
HOOK
BOLT (2)
COMBUSTION
CHAMBER
FRONT PANEL
WING NUT
SECURING
SCREW (4)
It is the Law that any servicing is carried out by a competent
person.
Draw attention, if applicable, to the current issue of the Gas
Safety (Installation and Use) Regulations, Section 35, which
imposes a duty of care on all persons who let out any property
containing a gas appliance.
Reminder, leave these instructions with the user.
Advise the user that the ‘Benchmark’ logbook should be
completed by the installation engineer on completion of
commissioning or servicing.
10.2 Main Burner - Service
Generally follow the instruction in “Heating Body - Servicing”.
With the main burner removed the injector can be unscrewed
and replaced as necessary, using a new sealing washer.
If cleaning do not use a wire or sharp instrument on the hole.
When replacing the main burner make sure that it is pushed fully
home onto the injector and that the guides are engaged on the
injector manifold.
10.3 Pilot Burner and Injector
Generally follow the instruction in “Heating Body - Servicing”.
With the main case and controls cover etc., removed as above,
pull off ignition lead from the electrode.
Unscrew the tubing nut at the base of the pilot burner, releasing
the pilot pipe. Remove the pilot injector by unscrewing from the
pilot burner, see diagram 10.1.
Release the wing nuts securing the flue hood, see diagram
10.1.
Remove the combustion chamber front panel as above.
Remove the two screws and washers securing the pilot burner
and pilot shield to the main burner, see diagram 10.2.
Remove the pilot shield complete with electrode.
Unscrew the thermocouple nut.
The pilot burner can be lifted away.
Take care not to damage the electrode.
When replacing make sure that the spark gap is as shown in
diagram 10.3.
0947
10.4 Thermocouple
Generally follow the instructions in “Heating Body - Servicing”.
Release, but do not remove, the two screws securing the front
and rear gland plates. Pull the front gland plate forward, see
diagram 10.4. Disconnect the thermocouple at the gas valve
and remove.
Use the old thermocouple as a pattern when fitting the new one.
Do not tighten the nut at the gas valve more than a quarter turn
beyond finger tight.
Check the electrode spark gap, see diagram 10.3.
Casing not illustrated for clarity
ACCESS for SERVICING
221481C
FRONT
PANEL
Diagram 10.1
10.5 Electrode
Generally follow the information under Section 10.3.
Unscrew the electrode from the pilot shield.
When refitting check that the gap is as in diagram 10.3.
16
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10 Servicing and Replacement of Parts
10.6 Over Heat Cutoff
Generally follow the information under Section 10.3.
Remove the two screws securing the over heat cutoff to the
clamp, see diagram 10.5.
Release connections at the gas valve, see diagram 10.6.
Release but do not remove the two screws securing the front
and rear gland plates, see diagram 10.4 and withdraw the cutoff
leads.
When refitting smear a little of the heat sink compound, supplied,
between the face of the cutoff and the water pipe, ensure that
it is correctly located on the pipe.
10.7 Gas Valve
See diagram 10.6.
Gain access as under Section 10.3.
Remove screw to release gas valve cover.
Disconnect all leads and pipes at the valve.
Undo the four screws each side of the valve to release the
service cock and burner supply tube, take care not to damage
to “O” rings.
Re-assembly note, when refitting the gas valve take care not to
damage the “O” rings.
Remake all connections.
Do not tighten the thermocouple nut more than a quarter turn
beyond finger tight.
It will be necessary to purge the pipework and valve before
relighting - refer to Commissioning.
Release, but do not remove, the two screws securing the front
and rear gland plates. Pull the gland plates forwards, see
diagram 10.4.
Withdraw the thermostat capillary through the bottom of the air
duct.
Disconnect cables (a) mains, L.N.E. (b) pump at terminal 8, 7
and earth stud, (c) cables at gas valve, (d) disconnect any
remote controls at terminal 9 and SL.
When replacing refer to diagram 7.2 for electrical connections.
Smear the thermostat phial with heat sink compound and
ensure it is secured, with the retainer, in the pocket.
14 to 17 mm
1053
14 to 17 mm
10.8 Electrical Control Box
Remove controls cover and outer casing as Section 10.1.
Remove retaining clip from the boiler thermostat phial pocket
and withdraw the phial, see diagram 10.5.
Remove the control box by undoing the two fixing screws at the
front and lower the front of the box until it is clear of the cover.
Push the box towards the rear of the boiler to disengage the
hinge and lower, see diagram 7.1.
MICA WINDOW
PILOT
SHIELD
SECURING
SCREWS
PILOT
INJECTOR
ADAPTOR
OLIVE
PILOT
TUBING NUT
PILOT ASSEMBLY
THERMOCOUPLE
THERMOCOUPLE
NUT
M3
SCREW
ELECTRODE
IGNITION
LEAD
(clear end)
Diagram 10.2
1049
SPARK GAP
3 to 4 mm
ELECTRODE
PILOT FLAME & SPARK GAP
THERMOCOUPLE
Diagram 10.3
FRONT GLAND
RELEASE SCREWS
PLATE
DO NOT REMOVE
AND PULL FRONT
GLAND PLATE FORWARD
REAR
GLAND
PLATE
PILOT
TUBE
THERMOCOUPLE
OVERHEAT
CUT-OFF LEADS
IGNITION
LEAD
THERMOSTAT
CAPILLARY
GLAND PLATEDiagram 10.4
0394
17
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10 Servicing and Replacement of Parts
10.9 Piezo Unit
Gain access as in Section 10.3.
Disconnect the ignition lead and remove backing nut from the
piezo unit.
10.10 Ignition Lead
Remove controls cover and outer casing as above.
Release, but do not remove, the two screws securing the front
and rear gland plates. Pull the gland plates forwards, see
diagram 10.4.
Remove the ignition lead, when replacing ensure that the clear
end is fitted to the electrode.
CUT-OFF
SECURING
SCREW(S)
0951
OVERHEAT
CUT-OFF
HEAT
EXCHANGER
RETAINING
CLIP
10.11 Thermostat
Gain access as Section 10.3.
Remove and support the control box as Section 10.9.
Remove the control knob and electrical connections from the
thermostat body.
Release, but do not remove, the two screws securing the front
and rear gland plates. Pull the gland plates forward, see
diagram 10.4.
Remove the two screws securing the thermostat to the control
box. The thermostat may now be removed withdrawing the
capillary through the bottom of the air duct.
When replacing smear the thermostat phial with the heat sink
compound supplied, before replacing and securing with the
retainer in the pocket.
THERMOSTAT
PHIAL/OVERHEAT
CUT-OFF
EXT. SCREW (4)
PILOT
TUBE
NUT
GAS VALVE
CONNECTORS
THERMOSTAT
PHIAL
Diagram 10.5
2414
'O' RING
INTERRUPTER
GAS VALVE ASSEMBLYDiagram 10.6
221481C
18
'O' RING
GAS SERVICE
COCK
(SHOWN OFF)
THERMOCOUPLE
NUT
ELECTRICAL
CONNECTOR (2)
EXTENSION
SCREW (4)
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11 Fault Finding
Fault and Cause
11.1 Pilot Goes Out after a Period of
Remaining Alight
Front cover not correctly fitted.
Flue parts not fitted or sealed properly.
Electrical supply failure causing over heat cutoff to
operate.
Operating cut-off operating.
Pump incorrectly wired.
11.2 Main Burner Will Not Light
External, remote controls not “On.”
Boiler thermostat not on.
11.3 Thermostat Will Not Cut Out
Thermostat phial not fitted in pocket.
Faulty thermostat.
Remedy
Fit parts correctly.
Seal cavity or fit flue parts correctly as described in
installation instructions.
Relight pilot.
Refer to Section11.3.
Connect pump in accordance with diagram 7.2.
Check that any remote controls are calling for heat.
Check boiler thermostat is in an “On” position, see
also Section 11.9.
Fit phial in pocket.
Replace thermostat.
11.4 Overheat Cutoff Cuts Out Prematurely
Air in heating body.
Water circulation low or stopped.
Overheat cutoff operates before boiler cycles on
maximum boiler thermostat setting.
The correctly set overheat cutoff operates
prematurely. There is no air in the heating body
and water circulation satisfactory.
11.5 Insufficient Heat
Thermostat set too low.
Inlet gas pressure inadequate.
Governor setting incorrect.
(ensure thermostat is on maximum setting).
11.6 Appliance Noisy in Operation*
Overgassed.
Complete lack of water.
Air in system.
Water flow rate.
Vent system. Alter system layout if necessary.
Pump not functioning correctly. Check pump is wire
directly to the boiler. Alter system if necessary.
Change faulty overheat cutoff.
Change faulty heating body.
Increase setting.
Increase gas pressure.
Check burner pressure against data label. Reset only
if more than 10% away from required figure.
Check burner pressure against data label and adjust
only if more than 10% away from stated required
figure.
Check system controls for correct installation or
correct type of controls.
Remove air from system. When system is first
commissioned the air dissolved may take some time
to boil out, therefore attempts should be made to
vent air during the first weeks of the installation.
Check venting of system, as air bubbles can remain
suspended in the water if system is not well vented.
Check that flow rate is correct. Check that pump is
correct size and is correctly adjusted. Bypass not
fitted or set correctly.
* There remains on most boilers a residual noise more noticeable at high temperatures. Normal operation of
the boiler over a period should remove most noise.
19
221481C
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11 Fault Finding
11.7 Thermocouple and Overheat Device.
To test the thermocouple a meter with a range of 0 to 30mV is
required.
Symptoms: The pilot burner fails to stay alight.
Test the thermocouple, overheat cutoff and thermocouple
connectors as described in fault finding chart 11.2.
Check the millivoltage of the thermocouple closed circuit at
points “A” and “E”, see diagram 11.1.
This should be within the range 6 to 13mV.
Take the millivoltage drop reading and refer to thermocouple/
overheat cutoff fault finding diagram 11.2.
2487
CONNECTION 'A'
GAS VALVE
CONNECTION 'E'
CONNECTION 'D'
BOILER
OVERHEAT
CUT-OFF
CONNECTION 'B'
CONNECTION 'C'
THERMOCOUPLE
With the boiler cold, check connections of the thermocouple, boiler overheat cut-off and gas valve.
Disconnect overheat cut-off connectors at points A and B at the gas valve, see diagram.
Test continuity of the overheat cut-off. Is there continuity ?
YES
Re-connect boiler overheat cut-off to points A and
B. Disconnect thermocouple at point D of gas
valve. Test continuity between point C and the
body of the body of the gas valve. Is there
continuity ?
NO
Test continuity of thermocouple between inner
connection point D and point E. is there
continuity ?
YES
Faulty boiler overheat
cut-off, renew
YES
Faulty cut-off
connectors into gas
valve, either at A or C.
Renew where faulty
NO
Faulty thermocouple,
renew
NO
Diagram 11.1
Thermocouple and boiler overheat circuit Satisfactory.
THERMOCOUPLE AND BOILER OVERHEAT CUTOFF FAULT FINDING
221481C
20
Diagram 11.2
Supplied By www.heating spares.co Tel. 0161 620 6677
11 Fault Finding
Isolate the supply. Gain access to the control
box, check all connections etc. Restore supply.
Using multimeter set at 240V.
YES
Is there 240 V between L and N ?
YES
Is there 240 V between 9 and N ?
YES
With Red Link removed between 9 and SL
and Remote Controls Calling for Duty.
Is there 240V between SL and N ?
YES
Is there 240 V between 9 and N ?
YES
Is there 240 V between 8 and N ?
YES
NO
NO
NO
NO
NO
4403
Check incoming supply and fuses.
Repair where required.
Faulty Brown bridge wire between L and 9
Repair where required.
Faulty Remote Controls, inform customer.
Faulty cable (BROWN), from terminal block to
thermostat, repair or renew.
Faulty cable (RED), from terminal block to
thermostat, repair or renew.
Is there 240 V between 3 and N ?
YES
Turn ON thermostat. With appliance cold.
Is there 240V between 6 and N ?
YES
Turn OFF thermostat.
Is there 240V between 6 and N ?
NO
Turn ON thermostat. With appliance cold.
Is there 240V between 7 and N ?
YES
YES
NO
NO
NO
Faulty cable (RED), from terminal block to
thermostat, repair or renew.
Faulty thermostat, renew.
Turn ON thermostat. Does main burner light ?
NO
Isolate the supply. Remove gas valve cover.
Restore supply. Is there 240V between 'L'
and 'N' on gas valve ?
NO
Faulty gas valve, renew.
Faulty gas valve harness, renew.
YES
NO
YES
Turn ON thermostat.
Is there 240V between 7 and N ?
YES
YES
NO
Continued
Continued
21
MAIN TERMINAL STRIP
THERMOSTAT TERMINALS
Continued
Diagram 11.3
221481C
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11 Fault Finding
Continued
NO
Turn ON thermostat;
Is there 240V between 7 and N ?
YES
Does pump run ?
YES
With thermostat set to MAX. allow appliance
temperature to reach max.
When appliance cuts out on temp. is there
240V between 7 and N ?
YES
With Remote Controls NOT Calling for Duty
does pump stop when the appliance has
cooled down ?
YES
CONTROLS IN ORDER
Continued
NO
NO
NO
NO
YES
4403A
Faulty Cable (PURPLE) between thermostat
and terminal block, repair or renew.
Faulty pump, inform customer
Faulty thermostat, renew.
MAIN TERMINAL STRIP
THERMOSTAT TERMINALS
11.8 Electrical
IMPORTANT. On completion of the service/fault finding task
which has required the breaking and remaking of electrical
connections then the checks, earth continuity, polarity and
resistance to earth must be repeated, using a suitable multimeter.
To check the boiler thermostat and multi-functional control (gas
valve), see diagram 11.3 and functional flow wiring diagram
11.4.
To check thermostat pump overrun circuit see diagram 11.3
and functional flow wiring diagram 11.4.
PERMANENT
LIVE
240V
50 Hz
FUSED
AT 3A
RED LINK
(If no switch
control is used)
MAIN TERMINAL
STRIP
THERMOSTAT
TERMINALS
BRN
9L
SL
SWITCH
CONTROL
(If used)
3
COMBINED
THERMOSTAT
AND PUMP
OVERRUN
Diagram 11.3 continued
11.9 Pilot
Refer to fault finding for pilot, see diagram 11.5.
BROWN
69 8
7
RED
BRN
PURPLE
BLUE
8
Solenoid
GAS
VALVE
L
7
N
BLUE
TO
PUMP
BLUE
N
BLUE
2415
N
221481C
22
Diagram 11.4FUNCTIONAL FLOW
Supplied By www.heating spares.co Tel. 0161 620 6677
PILOT WILL NOT LIGHT
START HERE
11 Fault Finding
Check gas line-open all cocks, rectify any
blockages, purge out any air. Does pilot light ?
NO
Apply match to pilot burner instead of pressing
igniter button. Does pilot light ?
NO
Undo tubing nut at pilot burner. Press gas valve
knob. Does gas flow freely ?
NO
Rectify blockage in pilot injector or pilot head.
Undo tubing nut at pilot outlet of gas valve. Press
gas valve knob. Does gas flow freely ?
NO
Change blocked pilot tube.
Change gas valve.
YES
YES
YES
YES
Does pilot stay alight when gas valve
knob released ?
NO
PILOT SATISFACTORY
Does pilot flame envelop
thermocouple ?
NO
Check aeration. If necessary-clean
pilot, Rectify blockage in pilot injector,
Adjust pilot throttle.
Check thermocouple circuit using faultfinding chart.
On pressing igniter button is there a
spark across electrode gap ?
NO
YES
YES
YES
Pull ignition lead off electrode. Hold end
of lead close to pilot burner and operate
piezo unit. Is there a spark across gap ?
NO
Pull ignition lead off piezo unit. Using
the blade of a screwdriver, touch
appliance chassis and leave approx
4mm gap from connection tag on piezo
unit. Operate piezo. Is there a spark
across gap ?
NO
Change piezo
unit.
Check electrode gap. Reposition, or
replace electrode if necessary.
YES
YES
Change
ignition lead.
BOILER PILOT FAULT-FINDING
23
Diagram 11.5
221481C
Supplied By www.heating spares.co Tel. 0161 620 6677
12 Spare Parts
12.1 Ordering
When ordering spare parts, quote the part number, description,
serial number and model from the label on the boiler, see
diagram 8.1.