Glowworm Betacom 24 Datasheet

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INSTALLATION AND SERVICING
High Effi ciency
Combination
Boilers
Glow-worm, Nottingham Road, Belper, Derbyshire. DE56 1JT
www.glow-worm.co.uk
982.160116/000 - 07.06
Betacom
Betacom 24
G.C. No. 47-019-04
Betacom 30
G.C. No. 47-019-05

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Thank you for installing a new Glow-worm appliance in your home.
Glow-worm appliances’ are manufactured to the very highest standard
so we are pleased to offer our customers’ a Comprehensive First Year Guarantee.
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.
Guarantee Registration
Customer Service:
01773 828100
Technical Helpline:
01773 828300
General and Sales enquiries:
Tel. [phone]
Fax: [phone]
To register your Glow-worm appliance
call:
0800 0732142

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CONTENTS DESCRIPTION SECTION PAGE
Warnings 4
Important Information 4
General Information 5
Appliance Safety Devices 6
Maintenance and Servicing 6
Technical Information 1 7
Boiler Location and Ventilation 2 12
Flue Options and Terminal Clearances 3 13
Heating System 4 15
Domestic Hot Water System 5 17
Installation Preparation 6 17
Gas/Water & Appliance Connection 7 19
Safety Discharge Valve and
Condensate Connection 8 20
Flue Preparation and Installation 9 22
Electrical Connection 10 34
Commissioning 11 36
Servicing 12 40
Fault Finding 13 43
Replacement of Parts 14 45
Spare Parts 15 47
Manual Handling 16 48
INTRODUCTION
INSTALLATION
INSTRUCTIONS
The instructions consist of two parts, Installation and Servicing Instructions. The instruc-
tions are an integral part of the appliance and must, to comply with the current issue of
the Gas Safety (Installation and Use) Regulations, be handed to the user on completion of
the installation.

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Gas Category
This boiler is for use only on G20 natural gas or G31 propane
with the use of an appropriate kit.
Gas Safety (Installation and Use) Regula-
tions
In your own interests and that of safety, it is the Law that ALL
gas appliances are installed by a competent person in accord-
ance with the current issue of the above regulations.
Testing and Certifi cation
This boiler is tested and certifi cated for safety and perform-
ance. It is, therefore, important that no alteration is made to the
boiler, without permission, in writing, by Glow-worm.
Any alteration not approved by Glow-worm, could invalidate
the certifi cation, boiler warranty and may also infringe the cur-
rent issue of the statutory requirements.
CE Mark
This boiler meets the requirements of Statutory Instrument,
No. 3083 The Boiler (Effi ciency) Regulations, and therefore is
deemed to meet the requirements of Directive 92/42/EEC on
the effi ciency requirements for new hot water boilers fi red with
liquid or gaseous fuels.
Type test for purposes of Regulation 5 certifi ed by: Notifi ed
body 0087.
Product/production certifi ed by: Notifi ed 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 de-
signed for use within certain voltage limits.
3. Directive 89/336/EEC on the approximation of the Laws
of the Member States relating to electromagnetic compat-
ibility.
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 hazard-
ous to health.
The adhesives and sealants used in this appliance are cured
and give no known hazard in this state.
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 ac-
cordance with the relevant standards.
In GB this is BS 7671.
In IE this is the current edition of I.S.813 “Domestic Gas Instal-
lations”.
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 identifi ed 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 contain-
ing a bath or shower.
Wiring to the boiler must be PVC 85°C insulated cable, not less
than 0.75mm² (24/0.20mm).
IMPORTANT NOTE
ALL electrical connections to the boiler
must be permanently fi xed to a wall or a
sturdy support feature in a tidy manner.
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.
Sheet 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

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General Information
General Note
This boiler is designed for use as part of a sealed water cen-
tral heating system with fully pumped circulation. The pump,
expansion vessel and associated safety devices are all fi tted
within the boiler.
Once the controls are set the boiler operates automatically.
Please read these instructions and follow them carefully for the
correct installation and economical use of your boiler.
Water Treatment
In the case of an existing system, it is ESSENTIAL that prior to
installing the new boiler the system is thoroughly fl ushed. For
optimum performance after installation of a new system, the
boiler and its associated central heating system should also
be fl ushed. Flushing should be carried out in accordance with
BS7593: 1992 using a cleanser such as Sentinel X300 or X400,
Fernox Restorer or Salamander corrosion guard cleaner.
For long-term corrosion protection, after fl ushing, a suitable in-
hibitor should be used, refer to the current issue of BS 5449
and BS 7593 on the use of inhibitors in central heating sys-
tems. Examples are Sentinel X100 Fernox Protector or Sala-
mander corrosion guard inhibitor.
Compartment or Cupboard Installations
If the boiler is fi tted into a compartment or cupboard it does not
require ventilation openings.
Do not use the compartment or cupboard for storage.
Clearances
If fi xtures are positioned close to the boiler, space must be
left as shown in diagram 2.1.
Condensate Drain
The condensate drain, see diagram 8.2, must not be modifi ed
or blocked.
Pluming from fl ue terminal
Like all boilers with a fl ue heat exchanger, this appliance will
produce a plume of condensation from the fl ue terminal in cool
weather. This is due to the high effi ciency and hence low fl ue
gas temperature of the boiler. It is normal and not a fault indi-
cation.
Electrical Supply
If the mains electricity and gas are to be turned off for any long
periods during severe weather, it is recommended that the
whole system, including the boiler, should be drained to avoid
the risk of freezing.
NOTE: Contact your installation/servicing company as drain-
ing, refi lling and pressurising MUST be carried out by a com-
petent person.
Manual Handling
IMPORTANT: With regards to the “Manual Handling Opera-
tions, 1992 Regulations”, the appliance exceeds the recom-
mended weight for a one man lift.

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Electrical Supply Failure
The boiler will not work without an electrical supply.
Normal operation of the boiler should resume when the electri-
cal supply is restored.
Reset any external controls, to resume normal operation of the
central heating.
If the boiler does not resume normal operation turn the mode
knob on position. If the boiler does not resume normal op-
eration after this call your Installation/Servicing company.
Overheating safety
In the event of the boiler overheating the safety devices will
cause a safety shutdown. If this happens, turn the mode knob
on position.
Safety Discharge Valve
A safety discharge valve and discharge pipe is fi 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.
Appliance Safety Devices
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 pro-
tection device will operate the pump when the temperature of
the boiler water falls below 5°C.
The burner will switch off when the temperature reaches 30°C.
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. Contact your installa-
tion/servicing company if the fault persists.
Maintenance and Servicing
Maintenance and Servicing
To ensure the continued effi cient and safe operation of the ap-
pliance 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 is-
sue of the Gas Safety (Installation and Use) Regulations, Sec-
tion 35.
Servicing/maintenance should be carried out by a competent
person in accordance with the rules in force in the countries
of destination.
To obtain service, please call your installer or Glow-worm’s
own service organisation using the telephone number on the
inside front cover of this literature.
Please be advised that the ‘Benchmark’ logbook, located at
back of literature, should be completed by the installation engi-
neer on completion of commissioning and servicing.
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 specifi cation that we require. Do not use recon-
ditioned or copy parts that have not been clearly authorised by
Glow-worm.
If a part is required contact Glow-worm’s own service organisa-
tion using the telephone number on the inside front cover of
this booklet.
Please quote the name of the appliance, this infomation will be
on the name badge on the front of the appliance.
If in doubt seek advice from the local gas company or Glow-
worm’s own service organisation using the telephone number
on the inside front cover of this booklet.

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700
400
300
180
C
L
FLUE
87
84
BOILER
C
L
1 Technical Information
1.1 IMPORTANT
The boiler is supplied in one carton, which includes the appli-
ance packs, see diagram 6.1.
The fl ue is supplied separately.
Where no British Standards exists, materials and equipment
should be fi t for their purpose and of suitable quality and work-
manship.
The installation of this boiler must be carried out by a compe-
tent person in accordance the rules in force in the countries
of destination.
Manufacturer’s instructions must not be taken as overriding
statutory requirements.
1.2 Statutory Requirements
In GB the installation of the boiler must be carried out by a
competent person 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 Fittings Regulations or Water byelaws in Scotland.
The Health and Safety at Work Act, Control of Substances Haz-
ardous to Health (COSHH).
The Current I.E.E. Wiring Regulations.
Where no specifi 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 and installed in accordance with the current edition of
I.S.813 “Domestic Gas Installations”, the current Building Regu-
lations and reference should be made to the current ETCI rules
for Electrical Installation.
In 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.
In IE: I.S.813, BS5546, BS 5449, BS 7074, BS 7593.
Manufacturer’s instructions must not be taken as overriding
statutory requirements.
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 specifi cation (CheSS)
and
2) Controls for domestic central heating system and hot wa-
ter. BRECSU.
Diagram 1.1

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1 Technical Information
1.3 Technical Data
All dimensions are given in millimetres (except as noted).
See diagrams 1.1 and Boiler Specifi cation table.
The data label is positioned on the base of the boiler.
Boiler specification Unit Betacom 24 Betacom 30
Gas category ll2H3+ ll2H3+
Heating output at 80°C/60°C (Hi) kW 18.1 - 24.5 11.1 - 28.6
Efficiency calculated on net calorific value
at 80/60°C
% 94.9 - 95.8 95.2 - 97.1
Heating output at 50°C/30°C (P) kW 19.2 - 26.2 15.9 - 30.6
Efficiency calculated on net calorific value
at 50/30°C
% 101.1 - 102.2 100.5 - 103.8
Heat input (Hs) (heating) kW 21.08 - 28.4 17.76 - 32.74
Heat input (Hs) (DHW) kW 11.65 - 28.4 13.3 - 32.74
Maximum hot water temperature °C 83 83
Heating
Heating temperature range C° 35 - 78 35 - 78
Expansion vessel, useful capacity l 8 8
Expansion tank initial pressure bar 1 1
Safety valve, maximum service pressure
(PMS) bar 3 3
Domestic hot water
Hot water temperature range °C 30 - 55 30 - 55
Specific flow rate (D) (ΔT 25°C) l/min 14.0 16.4
Specific flow rate (D) (ΔT 30°C) l/min 11.7 13.7
Specific flow rate (D) (ΔT 35°C) l/min 10.0 11.7
Threshold flow rate l/min 3 3
Maximum supply pressure bar 6 6
Minimum operating pressure bar 0.8 0.8
Combustion
Product outlet flow rate g/s 15.9 16.4
Product outlet temperature °C 85 70
Values of product outlet (measured on nominal heating output with G20 reference gas):
CO ppm 38.0 54.8
CO2 % 6.40 7.20
NOx balance mg/
kWh
163.1 122.0

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1 Technical Information
Boiler specification Unit Betacom 24 Betacom 30
Dimensions:
Height mm 700 700
Width mm 400 400
Depth mm 300 300
Net weight kg 41.5 43
Supply voltage V/Hz 230/50 230/50
Maximum absorbed power W 145 150
Electric protection IP X4D IP X4D
CE number 0694 BN 3710 0694 BN 3710
Technical data depending on the gas type
Natural gas G 20 (1)
Flow rate at maximum input m3/h 2.71 3.12
Flow rate at minimum input m3/h 1.11 1.27
Inlet pressure mbar 20 20
Burner injector diameter mm 1.25 1.30
(1) 15 °C, 1013,25 mbar
Burner pressure tables
Betacom 24
HEAT OUTPUT PRESSURE mbar
kW Btu/hr G20 G30 G31
9.5 32566 2.1 4.6 4.6
10 34120 2.3 5.0 5.1
11 37532 2.7 6.1 6.2
12 40944 3.2 7.2 7.5
13 44356 3.7 8.4 8.9
14 47768 4.3 9.7 10.4
15 51180 4.9 11.1 12.1
16 54592 5.5 12.5 13.9
17 58004 6.1 14.1 15.9
18 61416 6.8 15.7 18.0
19 64828 7.5 17.4 20.3
20 68240 8.2 19.2 22.7
21 71652 9.0 21.1 25.3
22 75064 9.8 23.1 28.0
23 78476 10.6 25.1 31.0
24 81888 11.4 27.2 34.1
24.5 83594 11.6 28.0 35.6
Betacom 30
HEAT OUTPUT PRESSURE mbar
kW Btu/hr G20 G30 G31
11.1 37832 2.2 4.0 4.0
12 40944 2.6 4.8 4.9
13 44356 3.0 5.8 6.0
14 47768 3.4 6.7 7.0
15 51180 3.9 7.7 8.1
16 54592 4.4 8.7 9.3
17 58004 4.9 9.7 10.5
18 61416 5.5 10.8 11.9
19 64828 6.1 12.0 13.3
20 68240 6.7 13.2 14.9
21 71652 7.3 14.5 16.5
22 75064 7.9 15.8 18.3
23 78476 8.6 17.2 20.1
24 81888 9.3 18.6 22.1
25 85300 10.0 20.0 24.1
26 88712 10.8 21.5 26.3
27 92124 11.5 24.6 30.9
28 95536 12.3 26.3 33.4
28.6 97735 12.7 27.5 35.5

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1.4 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 Instal-
lations”.
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 suitable leak detection fl uid, purge
in accordance with the above standard.
1 Technical Information
Diagram 1.2
1.5 Condensate Drain
A plastic drain pipe must be fi tted to allow discharge of conden-
sate to a drain.
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 8 for more details.
HEATING DOMESTIC
WATER
GAS
1 Drain valve
2 Pressure gauge
3 By-pass
4 Pump
5 Heating system safety valve 3 bar
6 Expansion vessel
7 Overheat thermostat
8 Condense syphonic trap
9 Automatic air vent
10 Recuperator
11 Flue overheat safety thermostat
12 Air pressure switch
13 Fan
14 Flue hood
15 Primary heat exchanger
16 Burner
17 Thermistor
18 Hydraulic 3-way valve
19 Water valve
20 Domestic plate to plate
heat exchanger
21 Gas valve
22 Low pressure sensor
RETURN
FLOW
OUTLET
INLET
CONDENSE
FLUE
WARNING: This
schematic is for in-
formation only.

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55
A removable compartment door
can be placed a minimum of 15mm
051 5
5050
200
006
2 Boiler Location and Ventilation
2.1 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 con-
taining 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.
2.2 Clearances
The boiler should be positioned so that at least the minimum
operational and servicing clearances are provided, see dia-
gram 2.1.
Additional clearances may be benefi cial around the boiler for
installation and servicing.
For fl ue installations where external access is not practicable,
consideration should be given for the space required to insert
the fl ue internally, which may necessitate clearance larger than
those specifi ed in diagram 2.1.
2.3 Timber Frame Buildings
If the boiler is to be installed in a timber frame building it should
be fi tted in accordance with the Institute of Gas Engineers doc-
ument IGE/UP/7/1998. If in doubt seek advice from local gas
undertaking or Glow-worm.
2.4 Room Ventilation
The boiler is room sealed so a permanent air vent is not re-
quired.
2.5 Cupboard or Compartment Ventilation
Due to the high effi ciency and hence low casing temperature of
this boiler, cupboard or compartment ventilation is not neces-
sary.
Leave existing air vents.
Diagram 2.1

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3 Flue Options and Terminal Clearances
Diagram 3.1
Top horizontal telescopic fl ue Ø60/100
Part No. A2043600
Top horizontal standard fl ue Ø60/100
Part No. A2043400
Vertical Flue
Vertical Flue Adapter, concentric fl ue Ø60/100
Part. No. A2024600
Vertical fl ue terminal kit, concentric fl ue Ø60/100
Part. No. 2000460480
Twin Flue
Twin Flue Adapter, concentric fl ue Ø80
Part No. A2011000
Flue Accessories
Black Horizontal Terminal Kit, for use with
A2043500; A2043600; A2043400
Black Horizontal Terminal Kit,
concentric fl ue Ø60/100 - Part No. A2043700
Plume Management Kit, for use with
A2043500; A2043600; A2043400
Plume Management Kit, basic set, white,
concentric fl ue Ø60/100 - Part No. A2044100
1m extension, white - Part No. A2044300
87o elbow, white - Part No. A2044700
45o bend (2), white - Part No. A2044500
Plume Management Kit, basic set, black,
concentric fl ue Ø60/100 - Part No. A2044000
1m extension, black - Part No. A2044200
87o elbow, black - Part No. A2044600
45o bend (2), black - Part No. A2044400
Concentric Flue Ø60/100 accessories:
2 metre extension kit, concentric fl ue
Ø60/100 - Part No. 2000460483
1 metre extension kit, concentric fl ue
Ø60/100 - Part No. 2000460482
0.5 metre extension kit, concentric fl ue
Ø60/100 - Part No. 2000460481
Adjustable fl ue pipe 0-50mm kit,
concentric fl ue Ø60/100 - Part No. 2000460487
90o fl u e elbow pack,
concentric fl ue Ø60/100 - Part No. 2000460484
45o fl u e bend pack,
concentric fl ue Ø60/100 - Part No. 2000460485
Flue support clips (3),
concentric fl ue Ø60/100- Part No. A2043900

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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
H* TO A BOUNDARY ALONGSIDE THE
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
Diagram 3.2
3.1 Flue Options
There are various fl ue options to choose from as illustrated in
diagram 3.1. The fl ue lengths and installation are described in
section 9.
3.2 Flue Terminal Position
The minimum acceptable siting dimensions for the terminal
from obstructions, other terminals and ventilation openings are
shown in diagram 3.2. For Ireland the minimum distances for
fl ue terminal positioning must be those detailed in I.S.813 “Do-
mestic 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
fl ue outlet. This should be taken into consideration when se-
lecting the position for the terminal.
NOTE: If necessary it is permitted to increase the terminal pro-
trusion through the outside wall to greater than the minimum di-
mension of 87mm but no more than 600mm, see diagram 1.1.
Carports or similar extensions of a roof only, or a roof and one
wall, require special consideration with respect to any open-
ings, 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 3.2 . 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.
Plume Management Kit: Part No.A2044100 (white) or A2044000
(black) can be used to overcome many site issues.
3.3 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 3.3.
A suitable guard is manufactured by: -
Tower Flue Components
Morley Rd.
Tonbridge
Kent
TN9 1RA.
Size: 280mm x 280mm x 270mm.
3 Flue Options and Terminal Clearances
Diagram 3.3
12325

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4 Heating System
4.1 General
The boiler is for use only with sealed central heating systems.
The safety valve is an integral part of the boiler and it cannot
be adjusted.
The pressure gauge indicates the system pressure.
The circulation pump is integral with the boiler.
4.2 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.
Guidance on vessel sizing is also given in the current issue of
BS5449 and BS7074 Part 1, for IE refer to the current edition
of I.S.813 “Domestic Gas Installations”.
4.3 Flow Rate
If it is necessary to alter the fl ow rate, the system can be fi tted
with a lockable balancing valve in the main fl ow or return pipes
shown as valve “A” in diagram 4.1. The fl ow rate through the
boiler must not be allowed to fall below that given in diagram
1.2.
4.4 Bypass
The boiler is fi tted with an automatic bypass.
Diagram 4.2 shows the pump head remaining for the heating
system depending on the bypass setting and the speed setting
of the pump, see section 11 Commisioning.
Ensure that under no circumstances does the fl ow rate drop be-
low the fi gure specifi ed, refer to diagram 1.2 and section 11.6.
The installation of the boiler must comply with the requirements
of the current issue of BS6798, in Ireland, refer also to the cur-
rent edition of I.S.813 “Domestic Gas Installations”.
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 Regula-
tions Advisory Service (WRAS) gives full details of the require-
ments.
In IE the requirements given in the current edition of I.S.813
“Domestic Gas Installations” and the current Building Regula-
tions must be followed.
4.5 Filling the Sealed System
NOTE: The water pressure at the boiler must be at least 1.2bar
to enable fi lling the boiler to a minimum pressure.
4.6 Water Treatment
In the case of an existing system, it is ESSENTIAL that prior to
installing the new boiler the system is thoroughly fl ushed. For
optimum performance after installation of a new system, the
boiler and its associated central heating system should also
be fl ushed. Flushing should be carried out in accordance with
BS7593: 1992 using a cleanser such as Sentinel X300 or X400,
Fernox Restorer or Salamander corrosion guard cleaner.
For long-term corrosion protection, after fl ushing, a suitable in-
hibitor 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.
Diagram 4.1

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4.7 Draining Points
Draining taps must be provided at the lowest points of the sys-
tem, which will allow the entire system to be drained.
The drain point for the appliance is provided at the position
shown in diagram 4.3.
Diagram 4.3
4 Heating System
Remaining conveyancing
capacity
Model Betacom 24
with pump’s selector
in speed position I, II, III
(automatic by-pass,
not disconnectable)
Remaining conveyancing
capacity
Model Betacom 30
with pump’s selector
in speed position I, II, III
(automatic by-pass,
not disconnectable)
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5
5,5
6
0 200 400 1000 1200600 800 1400
711
R00
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5
5,5
6
0 200 400 1000 1200600 800 1400
712
R00
Water flow l/h
Pressure m. H2O
Water flow l/h
Pressure m. H2O
Diagram 4.2

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5 Domestic Hot Water System
General
All domestic hot water circuits, connections, fi ttings must be
in accordance with the relevant standards and water supply
regulations.
For GB: Guidance G17 to G24 and recommendation R17 to
R24 of the Water Regulations Guide.
For IE: The current edition of I.S.813 “Domestic Gas Installa-
tions”.
5.1 Water Pressure
The maximum working pressure of the domestic hot water cir-
cuit is 6 bar. If the cold water supply pressure exceeds this,
then a pressure-reducing valve must be fi tted in the supply to
the boiler.
6.1 Appliance Pack
IMPORTANT: With regards to the Health and Safety Manual
Handling requirements, two persons shall be required to lift the
appliance, refer to section 16 Manual Handling.
Please check the contents of packs as shown in diagram 6.1.
The wall hanging bracket is located at the rear of the boiler,
slide upwards to remove.
6.2 Wall Template
Take the wall template from the document pack and place in
the desired position on a fl at wall, giving due consideration to
the required boiler clearances, see section 2, and the fl ue you
are fi tting.
6.3 Flue Hole Cutting
External access fl ue installation can use a 105mm diameter
core drill.
Internal access only fl ue installation will need a 125mm diam-
eter core drill.
If fl 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.
5.2 ‘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 wa-
ter setting is reduced and that a scale reducer is fi tted.
Refer to the manufacturer’s instructions or consult the local wa-
ter company for additional advice.
5.3 Domestic Water Flow Rate
The water fl ow rate is restricted to a maximum 8.4 l/min for 24
and 10.0 l/min for 30, by a restrictor factory fi tted within the
boiler.
6 Installation Preparation
Top horizontal fl ue -
(standard and telescopic)
The standard horizontal fl ue is designed with an internal fall
of 44mm/metre (2.5°) towards the boiler for disposal of con-
densate therefore the hole can be drilled horizontally. If the
standard fl ue length alone is being used then the fl ue hole of
diameter 105mm can be cut in the position marked on the wall
template.
For standard side fl ues the horizontal fl ue centre line on the
wall template should be extended to the side wall, and the ver-
tical centre of the fl ue hole marked at 176mm from the back
wall.
For extended side fl ues, the fl ue hole centre should be deter-
mined 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
fl ue should then be marked at 176mm from the back wall.
To allow for the fl ue passing through the wall at this angle a
125mm hole should be drilled irrespective of internal or exter-
nal installation.
Remove the wall template whilst drilling the fl ue hole.
6.4 Wall Hanging Bracket Assembly
The Wall Hanging Bracket is supplied in the main boiler pack-
aging at the rear of the boiler.
Reposition the wall template over the fl ue hole and mark the
position of the fi xing holes for the hanging bracket, see dia-
grams on the template.
NOTE: Due to the varied site conditions we do not supply fi x-
ings and advise that the installer should supply those which
are suitable.
Drill fi xing holes and insert suitable wall plugs.

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6 Installation Preparation
Diagram 6.1
Pipe pack
A - Central Heating × 2
B - Domestic Water outlet
C - Domestic Water inlet
D - Gas
Safety discharge valve pipe
(not illustrated)
DCBAA

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Diagram 7.1
A - Central Heating Isolation Valve
B - Domestic Hot Water
C - Gas Service Cock
D - Domestic Cold Water
E - Washers (not shown)
F - Condensate Connection
G - Safety Discharge Valve
7 Gas / Water & Appliance Connection
7.2 Appliance Connection
IMPORTANT: With regards to the Manual Handling Opera-
tions, 1992 Regulations, the following lift operation exceeds
the recommended weight for a one man lift, refer to section 16
Manual Handling.
NOTE: The appliance may contain a small amount of water,
place a water container beneath the boiler connections.
Lifting the boiler into position, lean the top of the boiler slightly
to the wall and position just above the hanging bracket. Low-
er the boiler slowly push back and engage onto the hanging
bracket.
Remove the protective caps.
Do the connections, interposing the sealing washers supplied
in the Loose Items pack.
Make good the fi nal connections.
G
Numbers 1 - 5
show the sequence to be
used when tightening to
copper tails.
A A
FB D C
1 2 43 5

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8 Safety Discharge Valve & Condensate Connections
Diagram 8.1
8.1 Safety Discharge Valve
The pipe from the safety discharge valve must not discharge
above an entrance, window or any type of public access area.
Take the safety discharge pipe, supplied in the pipe pack and
the union nut and seal, supplied in the loose items pack and fi t
as shown in diagram 8.1.
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.
The pipe must have a continuous fall and be routed to a posi-
tion 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.
To ease future servicing it is advisable to use a compression
type fi tting to extend the safety discharge valve tube.
8.2 Condensate Drain Connection
The condensate drain connection is at the rear of the boiler,
see diagram 7.1. A fl exible condensate outlet pipe is supplied
fi tted to the boiler and should be used to fi t onto the drain con-
nection, to discharge condensate to a drain. The drain pipe
22mm to 25mm OD. non corrosive plastic pipe should have a
fall of at least 2.5° away from the boiler.
Condensate should, if possible be discharged into the house-
hold internal drainage system. If this is not practicable, dis-
charge can be allowed into the external household drains or a
purpose designed soak away, refer to diagram 8.2.
It is recommended that any external condensate drain pipe is
insulated and also preferably of 32mm diameter, to prevent
freezing in adverse weather conditions.
It is not necessary to provide air breaks or extra traps in the
discharge pipe as there is already a trap inside the boiler.
Refer to BS5546 or BS6798 for advice on disposal of boiler
condensate.