Glow-worm Ultracom cx User Manual
Ultracom
Installation and Servicing
24cx
G.C. No. 47-019-06
30cx
G.C. No. 47-019-07
High Efficiency
Condensing Combination
Boilers
www.glow-worm.co.uk
Guarantee Registration
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 Guarantee.
This product is guaranteed for 24 months from the date of installation or 30 months from the date
of manufacture, whichever is the shorter, for parts and labour.
The second year of the parts guarantee, from the beginning of the 13th month onwards after
installation or manufacture, is conditional upon the boiler having been serviced by a competent
person approved at the time by the Health and Safety Executive,
in accordance with the manufacturer’s recommendations. We strongly recommend regular
servicing of your gas appliance, but where the condition is not met, any chargeable spare parts or
components issued within the applicable guarantee period still benet from a 12 month warranty
from the date of issue by the manufacturer.
We recommend you complete and return as soon as possible your guarantee registration card.
If your guarantee registration card is missing you can obtain a copy or record your registration by
telephoning the Glow-worm Customer Service number 01773 828100.
Customer Service:
01773 828100
Technical Helpline:
01773 828300
General and Sales enquiries:
Tel. 01773 824639
Fax: 01773 820569
To register your Glow-worm appliance call:
0800 0732142
Benchmark places responsibilities on both manufacturers and installers. The purpose is to ensure that customers are provided
with the correct equipment for their needs, that it is installed, commissioned and serviced in accordance with the manufacturer’s
instructions by competent persons and that it meets the requirements of the appropriate Building Regulations. The Benchmark
Checklist can be used to demonstrate compliance with Building Regulations and should be provided to the customer for future
reference.
Installers are required to carry out installation, commissioning and servicing work in accordance with the Benchmark Code of
Practice which is available from the Heating and Hotwater Industry Council who manage and promote the Scheme.
Visit www.centralheating.co.uk for more information.
2
These instructions consist of, Installation, Servicing, Fault Finding, Replacement of Parts
and Spares. 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.
CONTENTS DESCRIPTION SECTION PAGE
Warnings 4
Important Information 4
INTRODUCTION
Statutory Requirements 5
Boiler Design 6
Safety Devices 6
Servicing, Maintenance and Spare Parts 6
Boiler Specication 1 7
Boiler Dimensions &
Hydraulic Schematic 2 8
Boiler Location, Clearances
and Ventilation 3 9
Flue Options and Terminal Clearances 4 10
INSTALLATION
Water System 5 12
Installation Preparation 6 14
Boiler Fixing 7 16
Gas/Water Connections 8 16
Safety Discharge Valve and
Condensate Connections 9 18
Flue Length Preparation and Installation 10 20
Electrical Connection 11 36
Commissioning 12 38
MAINTENANCE
Servicing 13 42
Fault Finding 14 46
Replacement of Parts 15 54
Spare Parts 16 64
Manual Handling 17 66
Declaration of Conformity - 67
3
WARNINGS
Gas Leak or Fault
Turn off the gas emergency control valve immediately. Eliminate all sources of ignition, i.e.smoking, blowlamps,
hot air guns etc. Do not operate electrical lights or switches either on or off. Open all doors and windows,
ventilate the area.
Metal Parts
This boiler contains metal parts (components) and care should be taken when handling and cleaning,
with particular regard to edges.
Sealed Components
Under no circumstances must the user interfere with or adjust sealed parts.
Important Information
Gas Category
This boiler is for use only on G20 natural gas, but may be
converted for use on G31 gas (Propane L.P.G.).
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
approved at the time by the Health and Safety Executive.
in accordance with the current issue of these regulations.
Control of Substances Hazardous to Health
Under Section 6 of The Health and Safety at Work Act
1974, we are required to provide information on substances
hazardous to health.
The adhesives and sealants used in this appliance are cured
and give no known hazard in this state.
Insulation Pads
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.
Manual Handling
With regards to the “Manual Handling Operations, 1992
Regulations”, the appliance exceeds the recommended
weight for a one man lift, refer to section 17 for more
information.
Electrical Supply
The boiler MUST be earthed.
All system components shall be of an approved type and all
wiring to current I.E.E. wiring regulations.
External wiring must be correctly earthed, polarised and in
accordance with the relevant standards.
In GB, this is BS 7671.
In IE, this is the current edition of ETCI rules.
The boiler MUST be connected to a permanent 230V ac,
50Hz supply.
Connection of the whole electrical system of the boiler,
including any heating controls, to the electrical supply MUST
be through one common isolator and must be fused 3 Amp
maximum.
Isolation should be by a double pole switched fused spur box,
with a minimum gap of 3mm for both poles. The fused spur
box should be readily accessible and preferably adjacent to
the appliance. It should be identied as to its use.
Alternatively connection can be made through an unswitched
shuttered socket and 3A fused 3-pin plug both to the current
issue of BS 1363, provided they are not used in a room
containing a bath or shower.
Wiring to the boiler must be PVC 85
less than 0.75mm2 (24/0.20mm).
O
C insulated cable, not
Testing and Certification
This boiler is tested and certicated for safety and
performance. It is, therefore, important that no alteration is
made to the boiler, without permission, in writing, by Glowworm.
Any alteration not approved by Glow-worm, could invalidate
the certication, boiler warranty and may also infringe the
current issue of the statutory requirements.
CE Mark
This boiler meets the requirements of Statutory Instrument,
No. 3083 The Boiler (Efciency) Regulations, and therefore is
deemed to meet the requirements of Directive 92/42/EEC on
the efciency requirements for new hot water boilers red with
liquid or gaseous fuels.
Type test for purposes of Regulation 5 certied by: Notied
body 0087.
Product/production certied by: Notied 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 harmonisation of the Laws of
the Member States relating to 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.
4
Statutory Requirements
IMPORTANT
Where no British Standards exists, materials and equipment
should be t for their purpose and of suitable quality and
workmanship.
The installation of this boiler must be carried out by a
competent person in accordance the rules in force in the
countries of destination.
Manufacturer’s instructions must not be taken as overriding
statutory requirements.
Statutory Requirements
In GB, the installation of the boiler must comply with the
requirements of the current issue of BS6798 and be carried
out by a competent person approved at the time by the
Health and Safety Executive. as described in the following
regulations:
The manufacturer’s instructions supplied.
The Gas Safety (Installation and Use) Regulations.
The appropriate Buildings Regulations either The Building
Regulations, The Building Regulations (Scotland),The
Building Regulations (Northern Ireland).
The Water Supply (water ttings) Regulations 1999 and water
byelaws 2000, Scotland.
The Health and Safety at Work Act, Control of Substances
Hazardous to Health (COSHH).
The Current I.E.E. Wiring Regulations.
Where no specic instructions are given, reference should be
made to the relevant British Standard Code of Practice.
In IE, the installation must be carried out by a competent
person approved at the time by the Health and Safety
Executive. and installed in accordance with the current edition
of I.S.813 “Domestic Gas Installations”, the current Building
Regulations and reference should be made to the current
ETCI rules for Electrical Installation.
GB: the following Codes of Practice apply:
BS4814, BS6798, BS5440 Part 1 and 2, BS5546 Part 1,
BS5449, BS6891, BS6700, BS7074 Part 1 and 2, BS7593,
BS7671.
IE: I.S.813, BS5546, BS 5449, BS 7074, BS 7593.
NOTE: For further information, see the current issue of the
Building Regulations, approved document L1 ( in the UK) and
the following current issues of:
1) Central heating system specication (CheSS)
and
2) Controls for domestic central heating system and hot water.
BRECSU.
Gas Supply
The gas installation must be in accordance with the relevant
standards.
In GB, this is BS6891.
In IE, this is the current edition of I.S.813 “Domestic Gas
Installations”.
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 tightness using the
pressure drop method and suitable leak detection uid, purge
in accordance with the above standard.
Domestic Hot Water
All domestic hot water circuits, connections, ttings must be
in accordance with the relevant standards and water supply
regulations.
GB: Guidance G17 to G24 and recommendation R17 to R24
of the Water Regulations Guide.
IE: The current edition of I.S.813 “Domestic Gas Installations”.
Heating System
In GB, it is necessary to comply with the Water Supply (Water
Fittings) Regulations 1999 (for Scotland, the Water Byelaws
2000, Scotland).
To comply with the Water regulations your attention is drawn
to: The Water Regulations guide published by the Water
Regulations Advisory Service (WRAS) gives full details of the
requirements.
In IE, the requirements given in the current edition of I.S.813
“Domestic Gas Installations” and the current Building
Regulations must be followed.
5
Boiler Design
Boiler Design
This boiler is designed for use as part of a sealed water
central heating system with fully pumped circulation. The
pump, expansion vessel and associated safety devices are
all tted within the boiler. The optional integral programmer
is designed for both simple operation and maximum control.
Once the controls are set the boiler will operate automatically.
Condensate Drain
A plastic drain pipe must be tted to allow discharge of
condensate to a drain.
Safety Devices
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.
Reset any external controls, to resume normal operation of
the central heating.
If the boiler does not resume normal operation press the reset
button. If the boiler does not resume normal operation after
this call your Installation/Servicing company or Glow-worm
service.
Overheating Safety
The boiler software is designed to recognise the potential for
an overheat lockout and will shutdown before this happens.
To restart the boiler, press the reset button on the controls
fascia.
If the boiler fails to resume normal operation and all external
controls are calling for heat, then call your Installation/
Servicing company or Glow-worm service.
Safety Discharge Valve
A safety discharge valve and discharge pipe are tted to
the boiler. This valve must not be touched. Should there
be any discharge from the pipe, isolate the boiler electrical
supply and call your installer or Glow-worm’s own service
organisation using the telephone number on the inside front
cover of this booklet.
Condensate should, if possible, be discharged into the internal
household draining system. If this is not practical, discharge
can be made externally into the household drainage system or
a purpose designed soak away, see section 9 for more details.
Pluming from flue terminal
Like all condensing boilers this appliance will produce a plume
of condensation from the ue terminal in cool weather. This is
due to the high efciency and hence low ue gas temperature
of the boiler.
This is normal and not an indication of a fault.
Frost protection
The appliance has a built in frost protection device that
protects the boiler from freezing. With the gas and electric
supplies ON and irrespective of any room thermostat setting,
the frost protection device will operate the pump when the
temperature of the boiler water falls below 8OC.
A timer is used so that the temperature can be checked
periodically. After 10 minutes the pump will be stopped if the
temperature is higher than 10
The burner will activate if the boiler temperature does not
reach 10
drops to 5OC.
The burner will switch off when the temperature reaches
35
O
C after 30 minutes or at any time if the temperature
O
C.
O
C or has already reached 35OC.
Condensate Drain Blockage
As a safety feature the boiler will stop working if the
condensate drain becomes blocked. During freezing
conditions this may be due to the forming of ice in the
condense drain external to the house. Release an ice
blockage by the use of warm cloths on the pipe, the boiler
should then restart.
Servicing, Maintenance and Spare Parts
Servicing and Maintenance
To ensure the continued efcient and safe operation of the
boiler 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.
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 approved at the time by the Health and Safety
Executive. in accordance with the rules in force in the countries
of destination.
To obtain service, please call your installer or Glow-worm’s
own service organisation using the telephone number on the
inside front cover of this literature.
6
Spare Parts
Remember, when replacing a part on this appliance, use
only spare parts that you can be assured conform to the
safety and performance specication that we require. Do not
use reconditioned or copy parts that have not been clearly
authorised by Glow-worm.
If a part is required contact Glow-worm’s own service
organisation.
Please quote the name of the appliance, this information will be
on the name badge on the front of the appliance.
If in doubt seek advice from the local gas company or Glowworm’s own service organisation using the telephone number
on the inside front cover of this booklet.
1 Boiler Specication
13601
7
2 Boiler Dimensions & Hydraulic Schematic
13603
15421
Diagram 2.2
2.1 Boiler Dimensions & Hydraulic Schematic
All dimensions are given in millimetres (except as noted).
The general arrangement of the boiler is shown in diagram
2.1. and the hydraulic and gas schematic, diagram 2.2.
The data label is positioned on the front of the inner casing
panel.
Diagram 2.1
8
3 Boiler Location, Clearances and Ventilation
CLEARANCES
3.1 Location
This boiler is not suitable for outdoor installation.
This boiler may be installed in any room, although particular
attention is drawn to the installation of a boiler in a room
containing a bath or shower where reference must be made to
the relevant requirements.
This boiler is suitable for installation in bathroom zones 2 and
3.
In GB this is the current I.E.E. WIRING REGULATIONS and
BUILDING REGULATIONS.
In IE reference should be made to the current edition of
I.S.813 “Domestic Gas Installations” and the current ETCI
rules.
3.2 Clearances
The boiler should be positioned so that at least the minimum
operational and servicing clearances are provided, see
diagram 3.1.
Additional clearances may be benecial around the boiler for
installation and servicing.
For ue installations where external access is not practicable,
consideration should be given for the space required to insert
the ue internally, which may necessitate clearance larger
than those specied in diagram 3.1.
150
*5
600
13712
mm clearance
5
5
to combustible
material
5
5
3.3 Timber Frame Buildings
If the boiler is to be installed in a timber frame building it
should be tted in accordance with the Institute of Gas
Engineers document IGE/UP/7/1998. If in doubt seek advice
from local gas undertaking or Glow-worm.
3.4 Combustible Material
The boiler and ue are suitable for installation onto and
through combustible materials provided that:-
1) Minimum 5mm clearance is maintained around the
circumference of the ue (air intake).
2) The combustible surface and xings are suitable for
supporting the load.
3) The minimum clearances from the boiler case are
maintained.
3.5 Room Ventilation
The boiler is room sealed so a permanent air vent is not
required.
3.6 Cupboard or Compartment Ventilation
Due to the high efciency and hence low casing temperature
of this boiler, cupboard or compartment ventilation is not
necessary.
Leave existing air vents.
200
Diagram 3.1
9
4 Flue Options and Terminal Clearances
Top horizontal telescopic ue (Ø60/100)
Part No. A2043600 - Section 10, page 20
Top horizontal standard ue (Ø60/100)
Part No. A2043400 - Section 10, page 24
Ridge Tile Terminal
Part No. A2043800 Section 10, page 30
Twin Flue
Twin Flue Adapter, concentric ue (Ø80)
Part No. A2011000 - Section 10, page 33
Vertical Flue
Vertical Flue Adapter, concentric ue (Ø60/100)
Part. No. A2024600 - Section 10, page 29
Vertical ue terminal kit, concentric ue (Ø60/100)
Part. No. 2000460480 - Section 10, page 29
Plume Management Kit
basic set, white, concentric
ue (Ø60/100) - Part No.
A2044100 for use with Part
No. A2043400 and Part No.
A2043600 - Section 10,
page 35
Multiple Boiler Chimney Flue
Vertical concentric stack ue
suitable for use with:-
Top horizontal telescopic ue,
Top standard horizontal ue,
Twin Flue, as specied by the
manufacturer.
10
Diagram 4.1
4 Flue Options and Terminal Clearances
HORIZONTAL FLUES
A DIRECTLY BELOW AN OPENING, AIR BRICK,
OPENING WINDOWS 300
B ABOVE AN OPENING, AIR BRICK,
OPENING WINDOWS 300
C HORIZONTALLY TO AN OPENING,
AIR BRICK, OPENING WINDOWS 300
D BELOW GUTTER, DRAIN/SOIL PIPE 25
E BELOW EAVES 25
F BELOW A BALCONY OR CAR PORT 25
G FROM VERTICAL DRAIN PIPES AND
SOIL PIPES 25
H FROM INTERNAL/EXTERNAL CORNERS 25
* TO A BOUNDARY ALONGSIDE THE
H
TERMINAL 300
I ABOVE ADJACENT GROUND OR
BALCONY LEVEL 300
J
* FROM SURFACE OR A BOUNDARY
FACING THE TERMINAL 600
K FACING TERMINALS 1200
L FROM OPENING (DOOR/WINDOW)
IN CAR PORT INTO DWELLING 1200
M VERTICAL FROM A TERMINAL 1500
N HORIZONTALLY FROM A TERMINAL 300
VERTICAL FLUES
P FROM ANOTHER TERMINAL 600
Q ABOVE ROOF LEVEL 300
R FROM ADJACENT OPENING WINDOW 1000
S FROM ADJACENT WALL TO FLUE 300
4.1 Flue Options
There are various ue options to choose from as illustrated in
diagram 4.1. The ue lengths and installation are described in
section 10.
4.2 Flue Terminal Position
In GB the minimum acceptable siting dimensions for the
terminal from obstructions, other terminals and ventilation
openings are shown in diagram 4.2.
In IE the minimum distances for ue terminal positioning must
be those detailed in I.S.813 “Domestic Gas Installations”.
The terminal must be exposed to the external air, allowing free
passage of air across it at all times.
Being a condensing boiler some pluming may occur from
the ue outlet. This should be taken into consideration when
selecting the position for the terminal.
Carports or similar extensions of a roof only, or a roof and
one wall, require special consideration with respect to any
openings, doors, vents or windows under the roof. Care is
required to protect the roof if made of plastic sheeting. If
the carport comprises of a roof and two or more walls, seek
advice from the local gas supply company before installing the
boiler.
H* and J* See diagram 4.2 . These dimensions comply with
the building regulations, but they may need to be increased to
avoid wall staining and nuisance from pluming depending on
site conditions.
NOTE: If the ue terminal is positioned near a light source
insects may enter the ue system. Where safe and practical
to do so, advise the homeowner to check the ue outlet and
clear visible insects from the terminal end.
4.3 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
minimum of 50mm clearance from any part of the terminal and
be central over the terminal.
The guard should be similar to that shown in diagram 4.3.
A suitable guard is manufactured by: -
Tower Flue Components
Morley Rd.
Tonbridge
Kent TN9 1RA.
Size: 280mm x 165mm. Part No. CGDK3
15583
Diagram 4.2
Diagram 4.3
11
5 Water System
5.1 General
This boiler is designed for use as part of a sealed water
central heating system with fully pumped circulation. The
pump, expansion vessel and associated safety devices are all
tted within the boiler.
5.2 Safety Valve
The safety valve is an integral part of the boiler and it cannot
be adjusted. The pipe from the safety discharge valve must
not discharge above an entrance, window or any type of
public access area.
5.3 Expansion Vessel
The boiler has an integral expansion vessel with a capacity of
8 litres (1.76 gallons), with a charge pressure of 0.5bar.
NOTE: The expansion vessel volume depends on the total
water system volume and the initial system design pressure.
In GB, Guidance on vessel sizing is also given in the current
issue of BS5449 and BS7074 Part 1.
In IE, current edition of I.S.813 “Domestic Gas Installations”.
5.4 Flow Rate
If it is necessary to alter the ow rate, the system can be
tted with a lockable balancing valve in the main ow or
return pipes shown as valve “A” in diagram 5.1. The ow rate
through the boiler must not be allowed to fall below that given
in section 1 - Specication Table.
12800
5.5 Bypass
The boiler is tted with an automatic bypass which can be
adjusted to suit your system requirements.
Ensure that under no circumstances does the ow rate drop
below the gure specied, refer to section 1 - Specication
Table.
5.6 Filling the Sealed System
The boiler is supplied with a lling device, see diagram 8.1.
This lling device is designed to enable the lling and
pressurisation of the system in the event of loss of pressure.
NOTE: The water pressure at the boiler must be at least
1.2bar to enable lling the boiler to a minimum pressure. If
not pressurisation must be carried out by an alternative lling
loop.
Suitable external lling systems are shown diagrammatically,
see diagram 5.2. The system should be pressurized to 1bar,
indicated on the digital display with no heating demand.
5.7 Draining Points
Draining taps must be provided at all low points of the system,
which will allow the entire system to be drained.
Draining taps shall be to the current issue of BS2879.
Drain points for the appliance are provided at the positions
shown in diagram 8.1.
Diagram 5.1
5.8 Water Treatment
Existing system- It is ESSENTIAL that prior to installing the
new boiler the system is thoroughly ushed.
New system- For optimum performance after installation, the
boiler and its associated central heating system should also
be ushed.
Flushing should be carried out in accordance with BS7593:
2006 using a cleanser such as Sentinel X300 or X400, Fernox
Restorer or Salamander corrosion guard cleaner.
IMPORTANT: Ensure all cleanser is removed from the whole
system before adding an inhibitor.
For long-term corrosion protection, after ushing, an inhibitor
suitable for stainless steel exchangers should be used, refer
to the current issue of BS 5449 and BS 7593 on the use of
inhibitors in central heating systems. Examples are Sentinel
X100 Fernox Protector or Salamander corrosion guard
inhibitor.to the current issue of BS 5449 and BS 7593 on the
use of inhibitors in central heating systems. Examples are
Sentinel X100 Fernox Protector or Salamander corrosion
guard inhibitor.
Ensure all cleanser is removed from the system.
12
5 Water System
5.9 Water Pressure
The minimum working pressure to obtain the maximum
domestic ow is:-
24cxi 1.0bar
30cxi 1.0bar
The maximum working pressure of the domestic hot water
circuit is 10 bar. If the cold water supply pressure exceeds
this, then a pressure-reducing valve must be tted in the
supply to the boiler.
5.10 ‘Hard’ Water Areas
The temperatures within the heat exchanger are limited by
the boiler control system to minimise scale formation within
the hot water pipework. However, in areas where the water is
‘hard’ (i.e. more than 200mg/litre), it is recommended that the
hot water setting is reduced and that a scale reducer is tted,
refer to the manufacturer’s instructions or consult the local
water company for additional advice.
5.11 Domestic Water Flow Rate
The domestic hot water ow has a restrictor, factory tted,
which reduces the ow to a maximum of, 8.0 l/min for 24cx
and 12.0 l/min for 30cx.
12253
Diagram 5.2
13
6 Installation Preparation
Base Coverplate
A - Wire Retaining Clip
B - Union Nut and Sealing Washer
A - Central Heating x 2
C - Tap and Securing Screw
E - Gas Sealing Washer
F - O Ring
G - Union Nut
B - Domestic Hot Water Outlet
D - Sealing Washers
C - Gas
D - Domestic Cold Water Inlet
E - Saftey Discharge
Hanging Bracket
Electrical CartridgeGas and Water
Isolating Valves
0020036801
Pipe Pack 0020029671 Loose Items Pack
E
D
D
A
A
A
E
F
G
C
C
B
B
Retaining Screws
stored in cartridge
Documentation Pack (not illustrated)
Wall Template, User Instructions, Installation and Servicing Instructions.
13646
14
Diagram 6.1
6 Installation Preparation
6.1 Appliance Pack
Please check the contents of packs as shown in diagram 6.1.
The packs are located in the top polystyrene packing.
Remove the carton sleeve and top pack then lift the boiler and
its polystyrene base support out of the lower pack.
6.2 Site Requirements
The boiler mounting wall should be suitable for the weight of
the appliance and be true and at.
NOTE: Due to the varied site conditions we do not supply
xings and advise that the installer should supply those which
are suitable.
6.3 Wall Template
Take the wall template from the document pack located within
the top polystyrene packing and place in the desired position
on the wall, giving due consideration to the required boiler
clearances, see section 3, and the ue you are tting.
Mark the position of the ue centre, if tting a side ue, extend
the ue centre line into the corner then 158mm along the
adjacent wall.
For extended side ues, the ue hole centre should be
determined by extending the dashed inclined line on the
template to the side wall. This dashed line is drawn at 44mm/
metre (2.5°) rise from the boiler. Where this line reaches the
side wall, a horizontal line should be marked. The vertical
centre line of the ue should then be marked at 176mm from
the back wall.
To allow for the ue passing through the wall at this angle
a 125mm hole should be drilled irrespective of internal or
external installation.
Remove the wall template whilst drilling the ue hole.
13853
Diagram 6.2
6.4 Flue Hole Cutting
External access ue installation can use a 105mm diameter
core drill.
Internal access only ue installation will need a 125mm
diameter core drill.
NOTE: The ue is designed with an internal fall of 44mm/
metre (2.5°), therefore the hole can be drilled horizontally.
If ue extension pipes are to be used then a core drill size of
125mm is required. This will allow the extension pieces to
slope at 44mm/metre (2.5°) towards the boiler.
15
7 Boiler Fixing
7.1 Hanging Bracket Fixing
The Wall Hanging Bracket is supplied in the main boiler
packaging at the rear of the boiler.
Reposition the wall template over the ue hole and mark
the position of the xing holes for the hanging bracket, see
diagram 7.1.
Drill xing holes and insert suitable wall plugs.
13503
7.2 Boiler Hanging
IMPORTANT: With regards to the Manual Handling
Operations, 1992 Regulations, the following lift operation
exceeds the recommended weight for a one man lift, refer to
section 17 Manual Handling.
Lifting the boiler into position, lean the top of the boiler slightly
to the wall and position just above the hanging bracket. Lower
the boiler slowly and engage onto the hanging bracket, see
diagram 7.2.
13713
Diagram 7.1
8 Gas / Water Connections
8.1 Systems Connection
Remove the protective caps from the boiler connections.
NOTE: The appliance may contain a small amount of water,
place a water container beneath the boiler connections
Assemble and secure the pre formed copper tails to their
respective isolation valves making sure of their correct
orientation, see diagram 8.1.
Fit the isolation valves/copper tails with seals to the appliance
as shown in diagram 8.1
Make sure that all connections are secured in the sequence
shown on diagram 8.1.
There are ats on the body of the valves for locating a
spanner to aid tightening.
Fit the ‘O’ ring seal from the loose items pack to the Double
Check Inlet Valve assembly then secure into isolation valve
with wire retaining clip, see diagram 8.1.
Diagram 7.2
Fit the Central Heating Isolation Valve handles and secure
with screws provided.
NOTE: Make sure the test and drain points are accessible,
refer diagram 8.1.
Plumb the system pipe work to the copper tails.
NOTE: Do not subject service cocks to heat.
Flush out the domestic hot water and the heating systems,
refer to section 5.8.
The whole of the gas installation, including the meter, should
be inspected, tested for tightness and purged in accordance
with the current issue of BS6891 and in IE the current edition
of I.S.813 “Domestic Gas Installations”.
16
8 Gas / Water Connections
13643
Diagram 8.1
17
SAFETY
DISCHARGE
VALVE
VIEW ON UNDERSIDE OF BOILER
UNION NUT
AND SEAL
B
9 Safety Discharge Valve & Condensate Connections
9.1 Safety Discharge Valve
Take the safety discharge pipe, supplied in the pipe pack and
the union nut and seal, supplied in the loose items pack and
t as shown in diagram 9.1.
This must be extended, using not less than 15mm o.d. pipe,
to discharge, in a visible position, outside the building, facing
downwards, preferably over a drain.
To ease future servicing it is advisable to use a compression
type tting to extend the safety discharge valve tube.
The pipe must have a continuous fall and be routed to a
position so that any discharge of water, possibly boiling,
or steam cannot create any danger to persons, damage to
property or external electrical components and wiring.
9.2 Condensate Trap and Siphonic Drain
Connection
The condensate drain connection is behind the pump at the
rear of the boiler, see diagram 9.2. A exible condensate
outlet pipe is tted and should be used to couple the
condensate trap and siphonic drain to a 22mm to 25mm O.D.
non corrosive plastic pipe (overow pipe).
IMPORTANT: Please remove the bung from the exible pipe
before tting to a drain outlet pipe.
NOTE: the pipe should have a fall of a least 2.5
away from the boiler.
Condensate should, if possible be discharged into the
household internal drainage system. If this is not practicable,
discharge can be allowed into the external household drains
or a purpose designed soak away, refer to diagram 9.3.
It is recommended that any external condensate drain pipe is
protected and also preferably of 32mm diameter, to prevent
freezing in adverse weather conditions.
The condensate is discharged periodically in ‘slugs’ by
siphonic action.
It is not necessary to provide air breaks or extra traps in the
discharge pipe as there is already a 75mm high trap inside
the boiler. Fitting an extra trap may cause the boiler siphon to
work incorrectly.
Refer to BS5546 or BS6798 for advice on disposal of boiler
condensate.
O
44mm/metre
13644
Diagram 9.1
13645
CONDENSATE
TRAP AND
SYPHONIC DRAIN
FLEXIBLE
CONDENSATE
OUTLET PIPE
18
FLEXIBLE
CONDENSATE
OUTLET PIPE
VIEW ON UNDERSIDE OF BOILER
Diagram 9.2
9 Safety Discharge Valve & Condensate Connections
13000
Diagram 9.3
19
10 Telescopic Flue - Length, Preparation and Installation
Horizontal Telescopic Flue
13558
13559
10.1 Flue Length
The maximum permissible horizontal ue length is 10 metres
plus the ue terminal assembly, this can be achieved by use
of the accessories, see diagram 10.3.
However should an additional 87.5o or 2 x 45o elbows be
used then the length MUST be reduced by 1metre.
The diagram 10.1 shows the length achievable by using the
kit A2043600.
When extension pipes are used the ue system must be
designed to have a continuous fall to the boiler of at least 2.5o
44mm/metre to allow condensate to run back into the boiler
and out via the condensate drain.
The ue can be installed from inside the building, when
access to the outside wall face is not practicable.
The diagram 10.1 illustrates the lengths achievable without
the use of extensions or elbows.
Multiple Boiler Chimney Flue Length
The ue length must be calculated and installed according to
the relevant standards EN 13384-1 and 2 (C43 ue systems
only) with reference to the table below and the manufacturers
instructions supplied.
The appliance maximum ue length must be included when
calculating the overall design of the ue system.
NOTE: The horizontal ue terminal must be removed, see
diagram 10.2.
Diagram 10.1
MODEL 24cx 30cx
Exhaust mass rate (g/s)
At Min Thermal
Load (40C°/30°C)
At Max Thermal
Load (80C°/60°C)
Exhaust temperature (ºC)
At Min Thermal
Load (40C°/30°C)
At Max Thermal
Load (80C°/60°C)
2.30 2.36
11.30 14.20
56.0 63.0
76.0 75.0
20
10 Telescopic Flue - Length, Preparation and Installation
12841
Diagram 10.2
15418
Diagram 10.3
21
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