Glowworm Betacom2 24 User manual

condens
Installation
and Servicing
Betacom224
G.C. No. 47-019-16
Betacom228
G.C. No. 47-019-17

INTRODUCTION
1 Instructions guidance................................................................................................................... 3
1.1 Product documentation .......................................................................................3
1.2 Explanation of symbols .......................................................................................3
1.3 Guarantee registration ........................................................................................3
2 Appliance description................................................................................................................... 3
2.1 Safety devices ....................................................................................................3
2.2 Data label...........................................................................................................3
2.3 Regulation and statutory requirements.................................................................4
2.4 Hydraulic schematic ...........................................................................................4
3 Safety instructions and regulations ............................................................................................... 5
3.1 Safety instructions..............................................................................................5
3.2 Regulations .......................................................................................................5
4 Recycling..................................................................................................................................... 6
4.1 Appliance...........................................................................................................6
4.2 Packaging ..........................................................................................................6
TECHNICAL DATA
5 Betacom2 ...................................................................................................................................................................7
INSTALLATION
6 Appliance location ....................................................................................................................... 8
6.1 Location .............................................................................................................8
6.2 Clearances .........................................................................................................8
6.3 Ventilation .........................................................................................................8
7 Appliance installation .................................................................................................................. 9
7.1 Scope of delivery ................................................................................................9
7.2 Recommendations before installing .....................................................................9
7.3 Dimensions ......................................................................................................10
7.4 Mounting .........................................................................................................11
8 Hydraulic connection.................................................................................................................. 12
8.1 Gas and water connections................................................................................12
8.2 Safety Discharge Valve ......................................................................................13
8.3 Connection to the condensate trap.....................................................................13
9 Evacuation of combustion gas..................................................................................................... 15
9.1 Regulation........................................................................................................15
9.2 Flue conguration description ...........................................................................16
10 Electrical connections................................................................................................................. 17
10.1 Access to main board ........................................................................................17
10.2 Main board.......................................................................................................18
10.3 Electrical wiring ................................................................................................18
10.4 External accessories..........................................................................................19
10.5 Testing the electrical connections ......................................................................19
10.6 Wiring diagram .................................................................................................20
TABLE OF CONTENTS
- 1 -

11 Commissioning ......................................................................................................................... 21
11.1 Switching on ....................................................................................................21
11.2 Filling the CH system (Central heating) ...............................................................21
11.3 Filling DHW Circuit ............................................................................................21
11.4 Filling the Condensate Trap................................................................................21
11.5 Initial lighting...................................................................................................22
11.6 Gas rates..........................................................................................................22
11.7 Testing heating system......................................................................................23
11.8 Testing domestic hot water system.....................................................................23
11.9 Completion.......................................................................................................23
12 Specied Adjustment ................................................................................................................. 23
12.1 Heating circuit adjustment.................................................................................23
12.2 Installation settings ..........................................................................................24
12.3 After Sales Service settings ...............................................................................24
12.4 Status of the appliance......................................................................................25
12.5 Test modes .......................................................................................................26
12.6 CO2measurement .............................................................................................26
12.7 Re-check and restart .........................................................................................26
13 User information ........................................................................................................................ 26
MAINTENANCE
14 Trouble-shooting........................................................................................................................ 27
14.1 Fault diagnosis .................................................................................................27
14.2 Fault memory....................................................................................................28
14.3 Fault codes.......................................................................................................28
14.4 Functional ow diagram ....................................................................................30
15 Gas conversion adjustments ....................................................................................................... 31
15.1 Settings ...........................................................................................................31
15.2 Restart - re-check commissioning.......................................................................32
16 Draining ................................................................................................................................... 32
16.1 Heating circuit .................................................................................................32
16.2 Domestic Hot water circuit ................................................................................32
17 Servicing ................................................................................................................................... 32
17.1 Annual Maintenance .........................................................................................33
17.2 Casing removing ...............................................................................................33
17.3 Combustion check and setting the air/gas ratio valve..........................................34
17.4 Servicing..........................................................................................................35
17.5 Silencer ...........................................................................................................35
17.6 Expansion vessel ..............................................................................................35
17.7 Condensate trap ...............................................................................................36
17.8 Combustion block .............................................................................................37
17.9 Service completion ...........................................................................................38
18 Replacement of Parts.................................................................................................................. 38
18.1 General ............................................................................................................38
18.2 Boiler Access ....................................................................................................39
18.3 Viewing window................................................................................................39
18.4 Hydraulic block.................................................................................................40
18.5 Combustion block .............................................................................................42
18.6 Condensate trap ...............................................................................................44
18.7 PCB..................................................................................................................44
19 Spare parts................................................................................................................................ 45
20 Manual Handling........................................................................................................................ 47
21 Declaration of Conformity ........................................................................................................... 48
TABLE OF CONTENTS
- 2 -

0020145065_01 - 09/12 - Glow-worm
INTRODUCTION
1 Instructions guidance
1.1 Product documentation
The instructions are an integral part of the appliance and must be
handed to the user on completion of the installation in order to
comply with the current regulation.
• Carefully read the manual, to understand all the information
to enable safe installation, use and servicing. No liability can
be accepted in the event of damage for not complying with the
guidance in this instruction manual.
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.
1.2 Explanation of symbols
aDANGER:
Risk of injuries.
eDANGER:
Risk of electric shock.
bATTENTION:
Risk of damage to the appliance or to its surroundings.
iIMPORTANT:
Important information.
1.3 Guarantee registration
Thankyou 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 oer our customers a
Comprehensive 24 month Guarantee.
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.
2 Appliance description
2.1 Safety devices
2.1.1 Overheating safety
The appliance is designed to recognise the potential for an
overheat lockout and will shutdown before this happens.
2.1.2 Safety discharge valve
A safety discharge valve and discharge pipe are tted to the
boiler. This valve must not be touched.
- The heating safety valve opens when the pressure in the
heating circuit exceeds 3 bars.
• Should there be any discharge from the pipe, isolate the boiler
electrical supply and call your installer or Glow-worm’s own
service organisation.
2.1.3 Frost protection
The frost protection system operates the pump to start as soon
as the temperature in the heating circuit falls below 12°C. The
pump stops as soon as the temperature of the water contained
in the heating circuit reaches 15°C. If the temperature in the
heating system falls below 7°C, the burner ignites until it reaches
35°C. The frost-protection system is active when the appliance is
switched on. The system alone cannot ensure that the installation
is protected against frost. An separate frost thermostat is
necessary to control the temperature of the system.
aDANGER:
Your domestic water circuit (hot or cold) is not protected
by the boiler.
2.1.4 Condensate drain blockage
During freezing conditions this may be due to the forming of ice
in the condense drain external to the house. In this case, a safety
device shuts down the appliance.
2.2 Data label
The data label certies the country where the appliance is
intended to be installed.
Data label location:
1
Key
1 Data label
aDANGER:
The appliance shall only be connected to the gas type(s)
indicated on the data label.
• Refer to chapter "Technical Data" in the technical data section
to see the denition of the abbreviations used on the data
label.
INTRODUCTION
- 3 -

0020145065_01 - 09/12 - Glow-worm
2.3 Regulation and statutory requirements
2.3.1 CE Mark
This boiler meets the requirements of Statutory Instrument,
No. 3083 The Boiler (Eciency) Regulations, and therefore is
deemed to meet the requirements of Directive 92/42/EEC on the
eciency requirements for new hot water boilers red with liquid
or gaseous fuels.
Type test for purposes of Regulation 5 certied by: Notied body
1312.
Product/production certied by: Notied body 0086.
The CE mark indicates that the appliances described in this
manual are in compliance with the following directives:
- European directive n°2009-142 relative to gas appliances
- European directive n°2004-108 from the European Parliament
and Council relative to electromagnetic compatibility
- European directive n°2006-95 from the European Parliament
and Council relative to low voltage
- European directive n°92-42 relative to the yield of boilers
2.3.2 Local regulations
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 a competent person approved
at the time by the Health and Safety Executive 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.
2.4 Hydraulic schematic
15
14
13
12
11
10
9
7
8
5
6
4
3
2
1
16
17
18
19
20
21
24
23
22
25
26
Key
1 Gas isolating valve
2 Heatingowisolatingvalve
3 Heating safety valve
4 Filteroncoldwaterinlet
5 DHWowsensor
6 Water pressure sensor
7 Domestic plate to plate heat exchanger
8 Threewayvalve
9 By-pass
10 Heating return thermistor
11 Condensate trap
12 Ignition and control electrode
13 Burner
14 Main heat exchanger
15 Thermal fuse
16 Flue outlet
17 Silencer
18 Heating expansion vessel
19 Fan
20 Gas control valve
21 Ignition module
22 Heatingowthermistor
23 Air vent
24 Pump
25 Heating return isolating valve
26 Domesticcoldwaterisolatingvalve
A Heatingow
B Pipe for heating safety valve
C Domestichotwateroutlet
D Gas
E Coldwaterinlet
F Heating return
G Condensate drain
INTRODUCTION
- 4 -

0020145065_01 - 09/12 - Glow-worm
3 Safety instructions and regulations
3.1 Safety instructions
If the gas pressure at the input of the appliance is outside the
range specied, the appliance must not be put into operation.
eDANGER:
Incorrect installation can cause electric shock or
appliance damage.
• Never disable security devices and do not try to adjust them.
With regards to the “Manual Handling Operations, 1992
Regulations”, the appliance exceeds the recommended weight for
a one person lift.
The handling of the boiler may involve lifting, pushing and
pulling, the use of a sack truck may be required.
• Be sure to consider the following handling techniques and
precautions:
- Grip the appliance at its base
- Use safety clothing where appropriate, e.g. gloves, safety
footwear.
• Ensure safe lifting techniques are used:
- Keep back straight.
- Avoid twisting at the waist.
- Avoid upper body/top heavy bending.
- Always grip using the palm of the hand.
- Use designated hand holds.
- Keep load as close to body as possible.
- Always use assistance if required.
• Under no circumstances must the user interfere with or adjust
sealed parts.
• When assembling the connections, correctly position the seals
to avoid any leakage of gas or water.
• This appliance contains metal parts (components) and care
should be taken when handling and cleaning, with particular
regard to edges.
The basic safety instructions must be followed before attempting
to maintain or replace spare parts:
• Stop the appliance.
• Electrically isolate the appliance from the power supply.
• Turn o the appliance gas isolation valve.
• Hydraulically isolate the appliance using the isolation valves if
provided.
• Should you need to replace hydraulic components, drain the
appliance.
• Protect all the electrical components from water while working
on the appliance.
• Use only original spare parts.
• Use only new O-rings and gaskets.
• After having completed work on gas or water carrying
components, check for their tightness.
• When work on the appliance is completed, perform an
operational test and check for safety.
3.2 Regulations
3.2.1 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 approved at the time by the Health and Safety Executive
and in accordance with 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 and 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).
- Any electrical work must conform to BS7671 and part P of the
building regulations where applicable.
Where no specic 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 specication (CheSS) and
2) Controls for domestic central heating system and hot water.
BRECSU.
INTRODUCTION
- 5 -

0020145065_01 - 09/12 - Glow-worm
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.
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.
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.
3.2.2 Other 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 suer irritation to the eyes or severe irritation to the
skin seek medical attention.
4 Recycling
iIMPORTANT:
The recycling of the packaging must be carried out by
the qualied professional who installed the appliance.
4.1 Appliance
Most of the appliance is made of recyclable materials.
This symbol indicates that this appliance must not
be disposed of with household waste, that it should
be selectively collected for energy recovery, reuse or
recycling.
• Take the appliance to an appropriate collection point.
iIMPORTANT:
By complying with this directive, you will contribute to
the preservation of natural resources and the protection
of human health.
4.2 Packaging
We recommend that you recycle the packaging of the appliance in
a responsible fashion.
• Sort the waste in order to separate those elements which can
be recycled (cardboard, plastics ...) and those which cannot be
recycled.
• Eliminate the waste in accordance with existing regulations.
INTRODUCTION
- 6 -

0020145065_01 - 09/12 - Glow-worm
TECHNICAL DATA
5 Betacom2
Boiler, type C13, C33, C43
Description Unit 24 28
Gas category ll2H3P ll2H3P
SEDBUK rating 2009 % 89.0% 88.5%
Heating
Maximum heating input power kW 18.5 24
Minimum heating output power at
80/60°C (P min.) kW 7.7 8
Maximum heating output power at
80/60°C (P max.) kW 18.0 23.3
Minimum heating output power at
50/30°C (P min.) kW 8.5 8.8
Maximum heating output power at
50/30°C (P max.) kW 19.6 25.3
Minimum heating temperature °C 10 10
Maximum heating temperature °C 80 80
Minimum heating ow rate l/h 400 400
Content of heating expansion
vessel
l 8 8
gallons 1.76 1.76
Heating expansion vessel preset
pressure
bar 0.75 0.75
psi 10.9 10.9
Maximum heating system volume
(approx) l 160 160
Heating safety valve preset
pressure (PMS)
bar 3 3
lbf/in² 36/3 36/3
Domestic Hot Water
Minimum DHW output power (P
min.) kW 8 8
Maximum DHW output power (P
max.) kW 24 28
Maximum DHW temperature °C 60 60
Specic ow rate (∆T of 35 K) l/min 9.8 11.5
Minimum inlet water pressure bar 0.3 0.3
psi 4.3 4.3
Maximum inlet water pressure bar 10 10
psi 145 145
Combustion
Appliance NOx class 5 5
Electrical
Electrical supply V/Hz 230V /
50Hz
230V /
50Hz
Standby mode electrical power W 6 6
Operational mode electrical power
(Max) W 151 151
Internal fuse rating on main PCB A 2 2
Index of electrical protection (EN
60529) IPX4D IPX4D
Description Unit 24 28
Gas connection Ø O.D. mm 15 (copper) 15 (copper)
Heating flow and return connection
Ø O.D. mm 22 (copper) 22 (copper)
Domestic Hot Water connection
Ø O.D. mm 15 (copper) 15 (copper)
Condensate connection Ø I.D. mm Pusht
Plastic
Pusht
Plastic
Safety valve discharge connection
Ø O.D. mm 15 (copper) 15 (copper)
Lift weight kg 37 38
lb 82 84.8
Total weight (installed) kg 42 43
Number of CE certicate 1312 BU
5334
1312 BU
5334
Description Unit 24 28
Natural Gas G 20 (15 °C, 1013.25 mbar)
Maximum DHW gas ow rate m3/h 2.54 2.96
Maximum heating gas ow rate m3/h 1.96 2.54
Minimum gas ow rate m3/h 0.85 0.88
CO2at Qmax DHW + "tolerance
case ON" % 9.2 ± 0.3% 9.2 ± 0.3%
CO2at Qmax DHW + "tolerance
case OFF" % 9.0 ± 0.2% 9.0 ± 0.2%
CO2at Qmin +
"tolerance case ON" % 8.9 ± 0.3% 8.9 ± 0.3%
CO2at Qmin +
"tolerance case OFF" % 8.7 ± 0.2% 8.7 ± 0.2%
Inlet pressure mbar 20 20
Propane Gas G 31 (15 °C, 1013.25 mbar)
Maximum DHW gas ow rate kg/h 1.87 2.17
Maximum heating gas ow rate kg/h 1.44 1.87
Minimum gas ow rate kg/h 0.62 0.645
CO2at Qmax DHW + "tolerance
case ON" %10.3 ± 0.3%
10.3 ±
0.3%
CO2at Qmax DHW + "tolerance
case OFF" %10.1 ± 0.3%
10.1 ±
0.3%
CO2at Qmin +
"tolerance case ON" % 9.8 ± 0.3% 9.8 ± 0.3%
CO2at Qmin +
"tolerance case OFF" % 9.6 ± 0.2% 9.6 ± 0.2%
Inlet pressure mbar 37 37
TECHNICAL DATA
- 7 -

0020145065_01 - 09/12 - Glow-worm
INSTALLATION
iIMPORTANT:
All the drawings dimensions are shown in mm.
6 Appliance location
6.1 Location
6.1.1 Instructions
Before choosing a site for the appliance, carefully read the safety
warnings and installation manual.
• Ensure that wall to which the appliance will be mounted on is
structurally safe in order to support the weight of the appliance.
• Ensure that the space that the appliance is to be installed
within allows the appliance to be installed and the clearances
maintained. This will ensure that the connections to the water,
gas and ue can be accessed and inspected (see chapter
Clearances).
• Explain these requirements to the appliance user.
• Do not install the appliance above another appliance that
could damage it (for example, above a cooker that might emit
steam or grease) or in a room, which has a lot of dust in the
atmosphere which is corrosive.
• The boiler must be tted inside the property and exposed pipe
work may need to be protected from frost by tting a frost
thermostat.
6.1.2 Regulations
Location
This boiler is not suitable for outdoor installation.
This boiler is suitable for installation in bathroom zones 2 and 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.
6.2 Clearances
• To allow periodic maintenance, ensure the distances indicated
on the diagram.
Additional clearances may be benecial 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 from inside the property, which may necessitate clearance
larger than those specied in diagram.
ØA
ØA + 5 min.
600*
min.
0
min.
0
min.
200
min.
150
min.
Key
* A removable compartment door can be placed a minimum 5 mm in
frontofappliance.Aclearanceof600mmisrequiredfromaxed
surface.
The boiler and ue are suitable for installation onto and through
combustible materials provided that:
- Minimum 5mm clearance is maintained around the
circumference of the ue (air intake).
- The combustible surface and xings are suitable for
supporting the load.
- The minimum clearances from the boiler case are maintained.
6.3 Ventilation
6.3.1 Room Ventilation
The boiler is room sealed so a permanent air vent is not required.
6.3.2 Cupboard or Compartment Ventilation
Due to the high eciency and low casing temperature of this
boiler, cupboard or compartment ventilation is not necessary.
• Existing ventilation should be investigated for its purpose
before removing.
INSTALLATION
- 8 -

0020145065_01 - 09/12 - Glow-worm
7 Appliance installation
7.1 Scope of delivery
The appliance is delivered in a single carton with a document
pack and ttings.
iIMPORTANT:
The ues package will be ordered according to the
conguration of the installation.
• Please check the contents.
1 4.7
2
2.1
2.2
2.3
2.5
2.4
3
4
4.1
4.2
4.3
4.4
4.5
4.6
Key
1 Boiler (x1)
2 Accessories bag (x1)
2.1 Connection bag (x1)
- Heating return valve (x1)
  -Coldwaterinletvalve (x1)
  -Heatingowvalve (x1)
  -Domestichotwaterconnection (x1)
- Gas isolation valve (x1)
2.2 Hanging bracket (x1)
2.3  Screwsandwallplugsbag (x1)
2.4 Seals bag (x1)
- Flat seal ½" (x2)
- Flat seal ¾" (x5)
  -Flatsealforcoldwaterinlet¾" (x4)
2.5 PRV pipe (x1)
3 Wall template (x1)
4 Documents bag (x1)
4.1 Installation and servicing manual (x1)
4.2 Flue book (x1)
4.3 Instructions for use (x1)
4.4  Extendedguaranteeleaet (x1)
4.5 Guarantee envelope pack (x1)
4.6 Magnetic lighting instruction label (x1)
4.7 Gas conversion label (x1)
7.2 Recommendations before installing
7.2.1 Domestichotwatercircuitdesign
Water pressure
The minimum working pressure to obtain the maximum domestic
ow is 1,0 bar.
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.
‘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 200 mg/L of calcium carbonate), 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.
Domestic water ow rate
The domestic hot water ow has a restrictor, factory tted, which
reduces the ow to a maximum of:
- 24 : 8/min,
- 28 : 10/min,
Central Heating water ow 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.
-Heating circuit design
5
4
3
2
1
6
7
8
Key
1 Drain point
2 External bypass (if required)
3 Domestichotwaterout
4 Domesticcoldwatersupplyin
5 Boiler
6 Additional expansion vessel (if required)
7 Heating return circuit
8 Heatingowcircuit
9 Optional balancing valve
INSTALLATION
- 9 -

0020145065_01 - 09/12 - Glow-worm
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.
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
discharge safely in accordance with standards.
Expansion vessel
The boiler has an integral expansion vessel with a capacity of 8
litres (1.76 gallons), with a charge pressure of 0.75bar.
iIMPORTANT:
The heating system volume should be calculated to
ensure that the expansion vessel is suitable, it may be
necessary to add an additional vessel.
- 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”.
Bypass
The boiler is tted with an automatic bypass.
• Ensure that under no circumstances does the ow rate drop
below the gure specied, refer to chapter "Technical data".
Filling the sealed system
iIMPORTANT:
The boiler does not contain any lling loop, an external
one must be tted.
Suitable external lling systems are shown diagrammatically, see
diagram below.
3
2
1
3
2
1
4
8
9
7
5
7 6
5
Key
1 Heatingowcircuit
2 Heating return circuit
3 Boiler
4 Double check valve assembly
5 Domesticcoldwatersupplyin
6 Temporaryllingloop(removeimmediatelyafterlling)
7 Drain point
The system should be pressurised to 0.8bar, indicated on the
digital display with no heating demand.
Drain points
Drain taps must be provided at all low points of the system, which
will allow the entire system to be drained.
Drain taps shall be to the current issue of BS2879.
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 shall be carried out in accordance with BS 7593, a
chemical cleanser can be used either Sentinel X300, X400 or
Fernox F3 are suitable.
It is recommended to ush existing systems rst before tting the
new boiler.
• 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 heat exchangers can be used. Either
Sentinel X100 or Fernox F1 inhibitor can be used.
The boiler is suitable for use on systems using softened water.
7.3 Dimensions
418
338
130
346
740
INSTALLATION
- 10 -

0020145065_01 - 09/12 - Glow-worm
7.4 Mounting
• Make sure that the equipment used for implementing the
installation is compatible with that of the appliance.
• Determine the assembly location. See the "Appliance location"
chapter.
117
892
* 80/125ue=Ø150mm
** 80/125ue=Ø130mm
*** 80/125ue=156mm
• Take the wall template and place in the desired position
on the wall, giving due consideration to the required boiler
clearances, see chapter "Appliance location > Clearances", and
the ue you are tting.
7.4.1 Fixingtothewall
130
90°
4
5
6
2
1
3
Key
1 Wall template
2 Standarduelengthhorizontal
3 2.5°44mm/metreinclinedextendeduelength
4 Wall plug
5 Hanging bracket
6 Screw
Flue hole cutting
• Mark the position of the ue centre.
• Remove the wall template, then drilling the ue hole.
iIMPORTANT:
The ue is designed with an internal fall of 44mm/metre
(2.5o), therefore the hole can be drilled horizontally.
• Use a 105mm diameter core drill for external access ue
installation (60/100 ue) (80/125 ue > Ø130mm).
• Use a 125mm diameter core drill for internal access only ue
installation (60/100 ue) (80/125 ue > Ø150mm).
iIMPORTANT:
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 (2.5o) towards the boiler.
• If tting a side ue, extend the ue centre line into the corner
then 130mm along the adjacent wall.
• If tting an extended side ue, determine the ue hole centre
by extending the dashed inclined line on the template to the
side wall. This dashed line is drawn at 44mm/metre (2.5o)
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 130mm 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.
Hanging bracket xing
Due to the varied site conditions the xings supplied may not be
suitable, please make sure that those used are.
• Drill the holes for the xing screws in accordance with the wall
template.
• Fix the hanging bracket on the wall.
INSTALLATION
- 11 -

0020145065_01 - 09/12 - Glow-worm
7.4.2 Boiler hanging
aDANGER:
With regards to the Manual Handling Operations, 1992
Regulations, the following lift operation exceeds the
recommended weight for a one person lift, refer to
chapter "Manual Handling".
2
1
Key
1 Boiler
2 Hanging bracket
• 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.
8 Hydraulic connection
8.1 Gasandwaterconnections
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”.
iIMPORTANT:
The appliance may contain a small amount of water,
place a water container beneath the boiler connections.
• Take care to clean the pipes before assembly removing any
debris or burrs. Grease and oils may need to be removed they
are not possible to remove by cleansing and ushing. Foreign
bodies in the system may enter the appliance and interrupt its
operation.
• Do not use any solvent products, due to the risk of damaging
the circuit.
aDANGER:
Do not perform any 'hot work' directly under the
appliance, this may cause damage to the appliance
base. Heat may also damage the isolation valves.
Always pre-assemble pipes before tting them to the
boiler.
• Only use original seals supplied with the appliance.
• Check that there are no leaks. Repair if necessary.
• Check the cold water inlet lter is tted ( located in the
appliance cold water inlet pipe).
1
2
3
4
5
6
7
8
6
Key
1 Heatingreturnisolatingvalve+sealingwasher¾"
2 Coldwaterinletisolatingvalve+sealingwasher½"
3 Gasserviceisolatingvalvewithpressuretestpoint+sealingwasher
½"
4 Domestichotwateroutletisolatingvalve+sealingwasher½"
5 Heatingowisolatingvalve+sealingwasher¾"
6 ConnectionØO.D.22mm
7 ConnectionØO.D.15mm
8 GasconnectionØO.D.15mm
• Use only the original gas cock GER/1 DN15, CE-0085 CL 0082.
• Use only the olive and at seal washer supplied with the gas
cock.
• Remove the protective caps from the boiler connections.
• Flush out the domestic hot water and the heating systems.
iIMPORTANT:
Before turning on the cold mains supply to the boiler
turn o the cold water inlet to the boiler, lock the lling
loop in the closed position and close its lling taps.
INSTALLATION
- 12 -

0020145065_01 - 09/12 - Glow-worm
8.2 Safety Discharge Valve
B
A
3
2
1
Key
1 Discharge pipe 15mm o.d.
2 Pressure relief valve PRV
3 Draining outlet
A PRV outlet - to outside
B Appliance drain
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.
8.3 Connection to the condensate trap
aDANGER:
Condensate produced by the appliance is mildly acidic
(pH 3.5 - 5.0). Use protective gloves
bATTENTION:
Condensate must only be discharged in accordance with
these instructions.
iIMPORTANT:
The volume of condensates evacuated can reach about
15 litres per day for a detached house. This volume
is negligible compared to the volume of waste water
discharged by a house, because the condensates are
diluted in this water.
• Refer to BS5546 and BS6798 for advice on disposal of boiler
condensate.
2
1
Key
1 Condensate pipe
2 Condensateoutletpusht
• Make sure there is no protective plug tted.
• Connect the condensate pipe (1) to the condensate outlet (2).
iIMPORTANT:
The pipe should have a fall of a least 2.5° 44mm/metre
away from the boiler.
Wherever possible, the condensate drainage pipe should be
terminated into a suitable internal foul water discharge point
such as an internal soil and vent stack, internal kitchen or
bathroom waste pipe, washing machine waste pipe etc - ensuring
that condensate drains away from the boiler under gravity.
Consideration must always be given to reducing the possibility of
condensate pipes freezing and guidance must always be followed
in the current BS 6798:2009. It is recommended to insulate
external condensate pipes, any insulation must be vermin and
peck-proof.
If it is unavoidable to run and terminate the condensate internally
it is strongly advised to minimise the outside length of pipe and
be of a minimum external diameter of 32 mm. Condensate pipes
that pass through or from appliances installed in lofts, garages
and basements should be treated as external pipes. Follow
good installation practices and remove burrs from cut pipes
and observe the recommended jointing method of the pipes
and ttings. Note some installations may require the use of a
condensate pump on order to achieve internal discharge.
CONDENSATE PUMP
To be connected
to the most appropriate
discharge configuration
INSTALLATION
- 13 -

0020145065_01 - 09/12 - Glow-worm
INCREASE
PIPE SIZE
75 mm min.
100 mm min.
Washing machine
trap / waste
44
2.5
INSTALLATION
- 14 -

0020145065_01 - 09/12 - Glow-worm
9 Evacuation of combustion gas
9.1 Regulation
bATTENTION:
Only ue accessories supplied by Glow-worm must be
used.
Dierent ue outlet congurations can be carried out.
• Consult your supplier for more information about the other
possibilities and associated accessories.
44 mm/m 1 2
34
• Standard ue terminal kits have an in-built fall back to the
boiler to drain the condensate. These can be tted level
between the appliance and the termination position. All other
extended ues must have a fall of at least 44mm/m
The maximum length of the ue outlet is dened according to its
type (for example C13).
• Whatever the kind of ue system chosen, observe the
minimum distances indicated in the chart below to position
the ue terminals.
• To install the ue, refer to the separate ue instruction
supplied with your appliance.
• Explain these requirements to the user of the appliance.
aDANGER:
If necessary, you must install a ue terminal guard.
bATTENTION:
Caution! The connection between the ue elbow and the
ue outlet must be sealed.
In GB the minimum acceptable siting dimensions for the terminal
from obstructions, other terminals and ventilation openings are
shown in diagram overleaf.
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. A carport is dened
as a roof and one wall.
bATTENTION:
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.
Position Positionoftheueterminal mm
Horizontalues
Adirectly below an opening, air brick,
opening windows 300
B above an opening, air brick, opening windows 300
Chorizontally 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
H* to a boundary alongside the terminal 300
Iabove adjacent ground or balcony level 300
J* from surface or a boundary facing the terminal 600
Lfrom opening (door/window) in car port
into dwelling 1200
M vertical from a terminal 1500
N horizontally from a terminal 300
Verticalues
P from another terminal 600
Q above roof level 300
Rfrom adjacent opening window 1000
Sfrom adjacent wall to ue 300
(*) 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.
INSTALLATION
- 15 -

0020145065_01 - 09/12 - Glow-worm
9.2 Fluecongurationdescription
9.2.1 HorizontalconcentricueØ60/100mm
orØ80/125mm(C13typeinstallation)
aDANGER:
If necessary, you must install a terminal protection kit.
Ø 60/100 mm
L
63
1
Key
1Gasket(tted)
Ø 80/125 mm
L
1
Key
1Gasket(tted)
Type Max length
Ø 60/100 6 m
Ø 80/125 10 m
Each time an additional 90° bend is necessary (or 2 at 45°), the
length (L) must be reduced by 1 m.
When using the Plume Management Kit, the maximum lengths
ue pipe A and B (60/100mm) are:
A (m) 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
B (m) 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5
• Refer to the Plume Management Kit installation manual.
9.2.2 VerticalconcentricueØ60/100mm
orØ80/125mm(C33typeinstallation)
L
Type Max length (L)
Ø 60/100 6 m
Ø 80/125 10 m
Each time an additional 90° bend is necessary (or 2 at 45°), the
length (L) must be reduced by 1 m.
INSTALLATION
- 16 -

0020145065_01 - 09/12 - Glow-worm
9.2.3 Multipleboilerchimneyue
Ø60/100mm(C43typeinstallation)
bATTENTION:
The ue connecting from the appliance to the ue
system must be supplied from the manufacturer of the
boiler.
bATTENTION:
C43 ue systems must not be a 'pressurised system' but
act under natural draught principles.
bATTENTION:
C43 type ue systems must have their own condensate
drain tted and not allow condensate to mix into other
appliances.
L
B
A
1
2
3
4
5
Key
1 Pressure balancing system
2 Air-inlet pipe
3 Collector pipe
4 Boiler
5 Inspection hatch
A Final storey
B Groundoor
Type Max length (L)
Ø 60/100 10 m
Each time an additional 90° bend is necessary (or 2 at 45°), the
length (L) must be reduced by 1 m.
Model 24 28
Exhaust mass rate (g/s)
At min thermal load (40°C/30°C) 3.6 3.74
At max thermal load (80°C/60°C) 8.3 10.8
Exhaust temperature (°C)
At min thermal load (40°C/30°C) 45 46
At max thermal load (80°C/60°C) 71.6 79
10 Electrical connections
eDANGER:
Incorrect installation can cause electric shock or
appliance damage. The electrical connection of the
appliance must be made only by a qualied engineer.
The appliance must be connected directly to an accessible, xed,
switched, electrical outlet.
The external wiring must be earthed, with correct polarity and in
accordance with current standards.
The manufacturer declines any responsibility for damages to
persons or others caused by the incorrect installation of the
appliance earthing. This includes failure to comply with current
standards.
Electrical components have been tested to meet the equivalent
requirements of the BEAB.
• Do not use cable greater than 10 mm in diameter for the
electrical connections.
All system components must be of an approved type.
• Do not interrupt the mains supply with a time switch or
programmer.
The boiler is suitable for installation in bathroom zones 2 and 3.
10.1 Access to main board
1
2
3
4
Key
1 24 V access cover
2 Terminal blocks for 24 V connection
3 Terminal blocks for 230 V connection
4 230 V access cover
INSTALLATION
- 17 -

0020145065_01 - 09/12 - Glow-worm
10.2 Main board
123
30mm
max
Key
1 Connector
2 Electricalwires
3 Insulation
• Keep a distance of a maximum of 30 mm between connector
(1) and the start of the insulation (3).
• Fix the cables in the cable-clamp on the eBox.
10.3 Electricalwiring
Connection of the whole electrical system and any heating system
controls to the electrical supply must be through a double poled
common switched and fused isolator.
The isolator shall have a contact separation of 3mm on each pole.
It should be identied as to its use. Wiring to the boiler must be
PVC 850C insulated cable not less than 0.75mm² (24/0.20).
A fused three pin plug and shuttered socket outlet may be used
instead of a fused spur box provided that it is not used in a room
containing a xed bath or shower.
24
V
1
Key
1 Powersupplycable
• Connect the appliance's power cable to the 230 V single-phase
network + earth.
• Observe correct polarity when connecting the appliance.
10.3.1 230V permanent supply
aDANGER:
All cables connected to the appliance should be
permanently xed to the wall.
iIMPORTANT:
This appliance will not operate without a link or system
controls tted.
24
V
3
4
1
2
Key
1 230V permanent supply
2 Main board terminal block
=Mainsearth
N=Mainsneutral
L=Mainslive
3 Fuse
4 Double pole connector
• Connect mains supply as described.
INSTALLATION
- 18 -