Bosch Worcester Greenstar Ri ErP + Series User manual

UK/IE
Installation and Maintenance Instructions
Wall hung rsf gas fired condensing appliance
Greenstar Ri ErP +
6720644744-00.1Wo
For open vented & sealed system central heating systems & indirect mains fed domestic hot water
6 720 821 670 (2018/06) UK/IE
If you smell gas:
▶ Keep well away from the building: call the National Gas Emergency
Service on 0800 111 999.
▶ LPG appliances: Call the supplier’s number on the side of the gas
tank.
These appliances are for use with:
Natural Gas or LPG
(Cat. II 2H 3P type C13, C33 & C53)
Model GC Number
Natural Gas 9Ri ErP + 41-406-74
12Ri ErP + 41-406-75
15Ri ErP + 41-406-76
18Ri ErP + 41-406-77
21Ri ErP + 41-406-78
24Ri ErP + 41-406-79
LPG 9Ri ErP + 41-406-68
12Ri ErP + 41-406-69
15Ri ErP + 41-406-70
18Ri ErP + 41-406-71
21Ri ErP + 41-406-72
24Ri ErP + 41-406-73

Contents
6 720 821 670 (2018/06)2
CONTENTS
1 KEY TO SYMBOLS AND SAFETY PRECAUTIONS . . . . . . . . . . . . 4
1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 APPLIANCE INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Energy efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4 appliance main components . . . . . . . . . . . . . . . . . . . . . 12
3.5 Internal wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 PRE-INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Mains supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1.1 Electrical supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1.2 Gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2 Water systems and pipe work . . . . . . . . . . . . . . . . . . . . 14
4.3 Condensate discharge . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.3.1 Condensate pipe work . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.3.2 Internal connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3.3 External connection considerations . . . . . . . . . . . . . . . 18
4.4 Pressure relief pipe work . . . . . . . . . . . . . . . . . . . . . . . 19
4.4.1 Alternative PRV connections - Combined
PRV/condensate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.5 appliance location and clearances . . . . . . . . . . . . . . . . 20
4.5.1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5.2 Servicing clearances -
Ventilated compartment . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5.3 Compartments: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5.4 appliance clearances- Unventilated
compartments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5.5 Installation clearances - unventilated
compartments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5.6 Rooms containing a bath or shower . . . . . . . . . . . . . . . 21
4.6 Plumbing manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.6.1 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.7 Flue options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.7.1 Flue lengths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.8 Flue terminal positions . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.8.1 Vertical flue terminal positions . . . . . . . . . . . . . . . . . . . 25
4.8.2 Horizontal flue terminal positions . . . . . . . . . . . . . . . . 26
4.8.3 Plume re-direct and plume management terminal
positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.9 Cleaning primary systems . . . . . . . . . . . . . . . . . . . . . . . 30
4.9.1 Flushing the system . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.1 Unpacking the wall frame & ancillary items . . . . . . . . . . 31
5.2 Position the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.3 Wall mounting template & flue opening . . . . . . . . . . . . . 32
5.4 Outer case removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.5 appliance connection . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.5.1 Condensate connection . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.6 Flue turret/adaptor installation . . . . . . . . . . . . . . . . . . . 35
5.7 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6 COMMISSIONING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.1 Pre-Commissioning checks . . . . . . . . . . . . . . . . . . . . . . 37
6.2 Filling the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.3 Water treatment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.4 Starting the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.4.1 Appliance controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.5 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.5.1 Checking the gas inlet pressure . . . . . . . . . . . . . . . . . . . 39
6.5.2 Checking the gas rate . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.6 CO and Combustion checks . . . . . . . . . . . . . . . . . . . . . . 40
6.7 Finishing commissioning . . . . . . . . . . . . . . . . . . . . . . . . 42
6.7.1 Replace the outer case: . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.7.2 Install the bottom panel . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.7.3 Hand over . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.7.4 Appliance guarantee . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7 SERVICE AND SPARES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.1 Inspection and service . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.2 Checking gas inlet pressure . . . . . . . . . . . . . . . . . . . . . . 44
7.3 Checking flue integrity . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7.4 Fan pressure test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7.5 Flue gas analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
7.6 Setting the air/gas ratio . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.6.1 Setting the CO/CO2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.7 Cleaning the heat exchanger . . . . . . . . . . . . . . . . . . . . . 47
7.7.1 Syphon removal and cleaning . . . . . . . . . . . . . . . . . . . . 49
7.8 Replacement of parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
7.8.1 Removing the outer casing . . . . . . . . . . . . . . . . . . . . . . . 50
7.8.2 Primary sensor (CH NTC) . . . . . . . . . . . . . . . . . . . . . . . . 50
7.8.3 Overheat thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7.8.4 Flue overheat thermostat
(with grommet) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7.8.5 Lowering the appliance controls to the service
position: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.8.6 Gas valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.8.7 Air/gas manifold and fan assembly . . . . . . . . . . . . . . . . 52
7.8.8 Air pressure switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7.8.9 Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7.8.10 Electrode assembly and burner . . . . . . . . . . . . . . . . . . . 54
7.8.11 Re-assembly of the burner clamping plate . . . . . . . . . . 54
7.8.12 Heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.8.13 Syphon removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
7.8.14 Access to electrical control panel . . . . . . . . . . . . . . . . . 57
7.8.15 PCB Fuse and code plug . . . . . . . . . . . . . . . . . . . . . . . . . 57
7.8.16 PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Contents
6 720 821 670 (2018/06) 3
8 FAULT FINDING AND DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . 58
8.1 Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
9 OPERATIONAL FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
9.1 Appliance function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
9.2 Protection function . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
9.3 Component Characteristics . . . . . . . . . . . . . . . . . . . . . 62
9.3.1 Flow temperature (NTC) Sensor resistances . . . . . . . . 62
9.3.2 Flue overheat thermostat . . . . . . . . . . . . . . . . . . . . . . . 62
9.3.3 Overheat thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
9.3.4 Gas valve coil resistances . . . . . . . . . . . . . . . . . . . . . . . 62
9.3.5 Code plug numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

KEY TO SYMBOLS AND SAFETY PRECAUTIONS
6 720 821 670 (2018/06)4
1 KEY TO SYMBOLS AND SAFETY
PRECAUTIONS
1.1 KEY TO SYMBOLS
WARNINGS
The following keywords are defined and can be used in this document:
•NOTICE indicates a situation that could result in damage to property
or equipment.
•CAUTION indicates a situation that could result in minor to medium
injury.
•WARNING indicates a situation that could result in severe injury or
death.
•DANGER indicates a situation that will result in severe injury or death.
IMPORTANT INFORMATION
ADDITIONAL SYMBOLS
Examples of additional symbols used
A numbered step in an action sequence
A sequence of numbered steps or actions carried out in a specific order
to complete a task.
1.First action
2.Second action
3.Third action
etc.
A step in an action sequence
A sequence of defined actions or steps carried out in order to complete
a task.
▶Action
▶ Next action
▶etc
A reference to a related part in the document or to other related
documents.
To refer the reader to a specific figure/table/section within the manual.
e.g. figure 1.
A reference number to identify or refer to a part or item.
In a related figure, items or parts identified by a sequential number.
List entries, first and second levels
• A single component/item
• A component/list, made up of multiple parts/items.
– Sub component or sublist of main component/list.
–etc.
SYMBOLS USED IN THIS MANUAL
PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE
STARTING INSTALLATION.
Warnings in this document are identified by a warning
triangle printed against a grey background.
Keywords at the start of a warning indicate the type and
seriousness of the ensuing risk if measures to prevent
the risk are not taken.
This symbol indicates important information where
there is no risk to people or property.
Symbol Meaning
a numbered step in an action sequence
a step in an action sequence
a reference to a related part in the document or to other
related documents
a reference number to identify or refer to a part or item
a list entry
a list entry (second level)
Table 1 Symbols
1
Domestic Hot Water
Central Heating
Hot Water Storage Cylinder
Domestic Cold Water Supply
Gas Supply
Table 2 Commonly used symbols
These instructions are applicable to the Worcester appliance model(s)
stated on the front cover of this manual only and must not be used with
any other make or model of appliance.
These instructions apply in the UK and Ireland only and must be
followed except for any statutory obligations.
This appliance must be installed and serviced by a GAS SAFE
registered, competent person. Failure to install correctly could lead to
prosecution.
If you are in any doubt, contact the Worcester Technical helpline (0330
123 3366).
Please leave these instructions with the completed BENCHMARK
CHECKLIST, (or a certificate confirming compliance with IS 813, Eire
only) and the user manual with the owner or at the gas meter after
installation or servicing.
Distance learning and training courses are available from Worcester.
The BENCHMARK CHECKLIST can be found in the back of this
Installation manual.
ØDiameter
NG Natural Gas
LPG Liquid Petroleum Gas
CH Central Heating
DHW Domestic Hot Water
DCW Domestic Cold Water
DWTA Domestic Water Treatment Association
PRV Pressure Relief Valve
NTC Negative Temperature Coefficient (sensor)
IP Ingress Protection
RCD Residual Current Device
TRV Thermostatic Radiator Valve
ECV Emergency Control Valve
WRAS Water Regulations Advisory Scheme
SEDBUK Seasonal Efficiency of Domestic Boilers in the United
Kingdom
Table 3 Abbreviations use in this manual

KEY TO SYMBOLS AND SAFETY PRECAUTIONS
6 720 821 670 (2018/06) 5
1.2 SAFETY PRECAUTIONS
IF YOU SMELL GAS
A gas leak could potentially cause an explosion. If you smell gas, observe
the following rules.
▶ Prevent flames or sparks:
– Do not smoke, use a lighter or strike matches.
– Do not operate any electrical switches or unplug any equipment.
– Do not use the telephone or ring doorbells.
▶ Turn off the gas at the meter or regulator.
▶ Open windows and doors.
▶ Warn your neighbours and leave the building.
▶ Prevent anyone from entering the building.
▶ Well away from the building: call the National Gas Emergency Service
on 0800 111 999.
▶ LPG appliances: Call the supplier’s number on the side of the gas tank.
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 centralheating.co.uk for more information.
Health and safety
The appliance contains no asbestos and no substances have been used
in the construction process that contravene the COSHH Regulations
(Control of Substances Hazardous to Health Regulations 1988).
Combustion and corrosive materials
Do not store or use any combustible materials (paper, thinners, paints
etc.) inside or within the vicinity of the appliance.
Chemically aggressive substances can corrode the appliance and
invalidate any warranty.
Fittings and modifications
Fitting the appliance and any controls to the appliance may only be
carried out by a competent engineer in accordance with the current Gas
Safety (Installation and Use) Regulations.
Flue systems must not be modified in any way other than as described in
the fitting instructions. Any misuse or unauthorised modifications to the
appliance, flue or associated components and systems could invalidate
the warranty. The manufacturer accepts no liability arising from any
such actions, excluding statutory rights.
Servicing
Advise the user to have the system serviced annually by a competent,
qualified Gas Safe registered engineer. Approved spares must be used
to help maintain the economy, safety and reliability of the appliance.
Important
The service engineer must complete the Service Record on the
Benchmark Checklist after each service.
FLUE SYSTEM
Only use the approved Worcester Condensfit II
flue system with this appliance.
WORCESTER ORIGINAL SPARE PARTS
Only use Worcester original spare parts with this appliance.
Non Worcester original spare parts will invalidate the guarantee (if
applicable) and any warranty.

Regulations
6 720 821 670 (2018/06)6
2Regulations
Installation regulations
Current Gas Safety (Installation & Use) Regulations:
All gas appliances must be installed by a competent person in
accordance with the above regulations.
Failure to install appliances correctly could lead to prosecution.
The appliance must be installed in accordance with, and comply to, the
current: Gas Safety Regulations, IET Regulations, Building Regulations,
Building Standards (Scotland) (Consolidation), Building Regulations
(Northern Ireland), local water by-laws, Health & Safety Document 635
(The Electricity at Work Regulations 1989), EU Regulations No. 811/
2013 - Energy Labelling and any other local requirements.
British standards
Where no specific instruction is given, reference should be made to the
relevant British Standard codes of Practice.
BS7074:1 Code of practice for domestic and hot water supply
BS6891 Installation of low pressure gas pipe work up to 28mm
(R1)
BS5546 Installation of gas hot water supplies for domestic
purposes
EN12828 Central heating for domestic premises
BS5440:1 Flues and ventilation for gas appliances of rated heating
not exceeding 70kW (net): Flues
BS5440:2 Flues and ventilation for gas appliances of rated heating
not exceeding 70kW (net): Air Supply
BS7593 Treatment of water in domestic hot water central heating
systems
BS6798 Installation of gas fired boilers of rated input up to 70kW
(net)
LPG Installations
An appliance using LPG must not be installed in a room or internal space
below ground level unless one side of the building is open to the ground.
Irish Standards
The relevant Irish standards should be followed, including:
• ECTI National rules for electrical installations
• IS 813:2002 for Domestic Gas Installations.
Timber Framed Buildings
Where the boiler is to be fitted to a timber framed building the guidelines
laid down in BS5440: Part 1 and IGE "Gas Installations in Timber Frame
Buildings” should be adhered to.
Potable Water
All seals, joints and compounds (including flux and solder) and
components used as part of the secondary domestic water system must
be approved by WRAS.
CH Water
Artificially softened water must not be used to fill the central heating
system.

APPLIANCE INFORMATION
6 720 821 670 (2018/06) 7
3 APPLIANCE INFORMATION
3.1 APPLIANCE
Fig. 1 Appliance
1
2
3
6
6720813283-02.1Wo
390mm
270mm
*600mm to top of case front
590mm*
4
5
Do not use the pre-formed copper pipes supplied with
the appliance for the gas supply.
These copper pipes are for water only.
STANDARD PACKAGE:
1 Wall hung gas fired condensing regular appliance for central
heating and domestic hot water
2 Tail pipes - water only
3 Wall plate
4 Hardware literature pack (see checklist)
5ErPLabel
6 Bottom panel and wall mounting template
CHECK LIST
- HARDWARE LITERATURE PACK:
Qty.
Appliance Installation, Commissioning and Servicing
Instructions
1
Users Instructions 1
Consumer Guarantee Card 1
Sealing Pack: 1
- Compression Nut 22mm 3
- Compression Ring 22mm 3
Elbow assembly pack 1
- Elbow Assembly 1
- Fibre Washer 1
Table 4 Hardware lit pack - checklist

APPLIANCE INFORMATION
6 720 821 670 (2018/06)8
3.2 TECHNICAL DATA
Natural Gas Appliances
DESCRIPTION NATURAL GAS
UNIT 9kW 12kW 15kW 18kW 21kW 24kW
Gas flow rate - Max. 10 minutes from lighting
Natural Gas G20 m³/h 0.95 1.30 1.63 1.96 2.26 2.60
Central Heating
Max. rated heat input (net) kW 9.24 12.32 15.40 18.48 21.54 24.62
Min. heat input kW 3.45 3.45 4.62 5.54 7.38 7.38
Maximum rated heat output 40/30 °C kW 9.64 12.85 16.06 19.28 22.47 25.67
Maximum rated heat output 50/30 °C kW 9.55 12.74 15.92 19.11 22.27 25.45
Maximum rated heat output 80/60 °C kW 91215 18 21 24
Maximum flow temperature °C 82 82 82 82 82 82
Maximum possible flow temperature °C 87 87 87 87 87 87
Maximum permissible operating pressure bar 2.5 2.5 2.5 2.5 2.5 2.5
Flue
Flue gas temp. 80/60 °C, rated/min. load °C 60/56 62/56 66/58 70/60 74/63 78/63
Flue gas temp. 40/30 °C, rated/min. load °C 38/33 41/33 44/33 48/34 51/35 54/35
CO2level at max. rated heat output (after 30 min) % 9.6 9.6 9.6 9.6 9.6 9.55
CO2level at min. rated heat output (after 30 min) % 8.6 8.6 8.6 8.6 8.6 8.55
NOx class 666666
NOx rating mg/kWh 36.0 38.6 44.3 48.7 55.5 56.0
Condensate
Maximum condensate rate l/h 0.60 0.93 1.20 1.50 1.80 2.00
pH value, approx. 4.8 4.8 4.8 4.8 4.8 4.8
Electrical
Electrical power supply voltage A.C. V 230 230 230 230 230 230
Frequency Hz 50 50 50 50 50 50
Maximum power consumption W 25 33 44 49 42 51
General data
Appliance protection rating IP 20 20 20 20 20 20
Permissible ambient temperatures °C 0 - 50 0 - 50 0 - 50 0 - 50 0 - 50 0 - 50
Nominal capacity of appliance litre 1.1 1.1 1.1 1.1 1.1 1.1
Packaged appliance weight kg 31 31 31 31 31 31
Total appliance weight kg 27.4 27.4 27.4 27.4 27.4 27.4
Lift weight kg 22.6 22.6 22.6 22.6 22.6 22.6
SEDBUK 2005 % 89.8 89.8 89.7 89.7 89.6 89.6
SEDBUK 2009 % 89.1 89.1 88.9 88.9 88.7 88.7
Flue system Category II 2H 3P type C13, C33 & C53
Table 5 Technical data Natural Gas

APPLIANCE INFORMATION
6 720 821 670 (2018/06) 9
LPG Appliances
DESCRIPTION LPG
UNIT 9kW 12kW 15kW 18kW 21kW 24kW
Gas flow rate - Max. 10 minutes from lighting
Propane Gas (LPG) kg/h 0.71 0.96 1.20 1.44 1.77 1.91
Central Heating
Max. rated heat input (net) kW 9.24 12.32 15.40 18.48 21.54 24.62
Min. heat input kW 5.95 5.95 5.95 9.64 9.64 9.64
Maximum rated heat output 40/30 °C kW 9.64 12.85 16.06 19.28 22.47 25.67
Maximum rated heat output 50/30 °C kW 9.55 12.74 15.92 19.11 22.27 25.45
Maximum rated heat output 80/60 °C kW 91215 18 21 24
Maximum flow temperature °C 82 82 82 82 82 82
Maximum possible flow temperature °C 87 87 87 87 87 87
Maximum permissible operating pressure bar 2.5 2.5 2.5 2.5 2.5 2.5
Flue
Flue gas temp. 80/60 °C, rated/min. load °C 59/57 62/57 66/59 71/61 75/64 79/64
Flue gas temp. 40/30 °C, rated/min. load °C 40/35 43/35 46/36 49/37 52/37 55/38
CO2level at max. rated heat output (after 30 min) % 10.5 10.5 10.5 10.5 10.5 10.5
CO2level at min. rated heat output (after 30 min) % 10 10 10 10 10 10
NOx class 666666
NOx rating mg/kWh 36.0 38.6 44.3 48.7 55.5 56.0
Condensate
Maximum condensate rate l/h 0.5 0.7 0.9 1.2 1.4 1.5
pH value, approx. 4.8 4.8 4.8 4.8 4.8 4.8
Electrical
Electrical power supply voltage A.C. V 230 230 230 230 230 230
Frequency Hz 50 50 50 50 50 50
Maximum power consumption W 26 36 52 55 44 54
General data
Appliance protection rating IP 20 20 20 20 20 20
Permissible ambient temperatures °C 0 - 50 0 - 50 0 - 50 0 - 50 0 - 50 0 - 50
Nominal capacity of appliance litre 1.1 1.1 1.1 1.1 1.1 1.1
Packaged appliance weight kg 31 31 31 31 31 31
Total appliance weight kg 27.4 27.4 27.4 27.4 27.4 27.4
Lift weight kg 22.6 22.6 22.6 22.6 22.6 22.6
SEDBUK 2005 % 90.1 90.1 90.5 90.4 90.0 90.0
SEDBUK 2009 % 89.0 89.0 89.1 89.2 88.9 88.9
Flue system Category II 2H 3P type C13, C33 & C53
Table 6 Technical data LPG

APPLIANCE INFORMATION
6 720 821 670 (2018/06)10
3.3 Energy efficiency
Natural Gas appliances
The following product data satisfy the requirements of the EU Regulations No. 811/2013 and No. 812/2013 supplementing Directive 2010/30/EU.
Product data Symbol Unit 7733600306 7733600307 7733600308 7733600309 7733600310 7733600311
Product type – – 9Ri ErP + NG 12Ri ErP + NG 15Ri ErP + NG 18Ri ErP + NG 21Ri ErP + NG 24Ri ErP + NG
Condensing boiler – – Yes Yes Yes Yes Yes Yes
Low temperature boiler – – No No No No No No
B1 boiler – – No No No No No No
Cogeneration space heater
(CHP)
– – No No No No No No
Combination heater – – No No No No No No
Rated heat output Prated kW9 1215182124
Seasonal space heating
energy efficiency
ηs%929292929292
Energyefficiencyclass––AAAAAA
Useful heat output
At rated heat output and
high temperature regime 1)
1) High-temperature regime means 60 °C return temperature at heater inlet and 80 °C feed temperature at heater outlet.
P4kW9 1215182124
At30%of ratedheat output
and low temperature
regime 2)
2) Low temperature means for condensing boilers 30 °C, for low-temperature boilers 37 °C and for other heaters 50 °C return temperature (at heater inlet).
P1kW445688
Useful efficiency
At rated heat output and
high temperature regime 1)
η4% 87.2 87.2 86.9 86.9 86.7 86.7
At30%of ratedheat output
and low temperature
regime 2)
η1% 98.1 98.1 97.6 97.6 97.2 97.2
Auxiliary electricity consumption
At full load elmax kW 0.025 0.033 0.044 0.049 0.042 0.051
At part load elmin kW 0.016 0.016 0.018 0.018 0.017 0.017
In standby mode PSB kW 0.003 0.003 0.003 0.003 0.003 0.003
Other items
Standby heat loss Pstby kW 0.059 0.059 0.059 0.059 0.059 0.059
Ignition burner power
consumption
Pign kW000000
Emissions of nitrogen
oxides
NOx mg/kWh 32 35 40 44 50 51
Annual energy
consumption
QHE kWh------
Sound power level, indoors LWA dB(A)454548505050
Table 7 Product data for energy consumption

APPLIANCE INFORMATION
6 720 821 670 (2018/06) 11
LPG appliances
The following product data satisfy the requirements of the EU Regulations No. 811/2013 and No. 812/2013 supplementing Directive 2010/30/EU.
Product data Symbol Unit 7733600300 7733600301 7733600302 7733600303 7733600304 7733600305
Product type – – 9Ri ErP + LPG 12Ri ErP + LPG 15Ri ErP + LPG 18Ri ErP + LPG 21Ri ErP + LPG 24Ri ErP + LPG
Condensing boiler – – Yes Yes Yes Yes Yes Yes
Low temperature boiler – – No No No No No No
B1 boiler – – No No No No No No
Cogeneration space heater
(CHP)
– – No No No No No No
Combination heater – – No No No No No No
Rated heat output Prated kW9 1215182124
Seasonal space heating
energy efficiency
ηs%929292929292
Energyefficiencyclass––AAAAAA
Useful heat output
At rated heat output and
high temperature regime 1)
1) High-temperature regime means 60 °C return temperature at heater inlet and 80 °C feed temperature at heater outlet.
P4kW9 1215182124
At30 %of rated heatoutput
and low temperature
regime 2)
2) Low temperature means for condensing boilers 30 °C, for low-temperature boilers 37 °C and for other heaters 50 °C return temperature (at heater inlet).
P1kW 6 6 6 10 10 10
Useful efficiency
At rated heat output and
high temperature regime 1) η4% 87.2 87.2 86.9 86.9 86.7 86.7
At30 %of rated heatoutput
and low temperature
regime 2)
η1% 98.1 98.1 97.6 97.6 97.2 97.2
Auxiliary electricity consumption
At full load elmax kW 0.026 0.036 0.052 0.055 0.044 0.054
At part load elmin kW 0.019 0.019 0.018 0.023 0.019 0.019
In standby mode PSB kW 0.003 0.003 0.003 0.003 0.003 0.003
Other items
Standby heat loss Pstby kW 0.059 0.059 0.059 0.059 0.059 0.059
Ignition burner power
consumption
Pign kW000000
Emissions of nitrogen
oxides
NOx mg/kWh 32 35 40 44 50 51
Annual energy consumption QHE kWh------
Sound power level, indoors LWA dB(A)454548505050
Table 8 Product data for energy consumption

APPLIANCE INFORMATION
6 720 821 670 (2018/06)12
3.4 APPLIANCE MAIN COMPONENTS
123 456
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
6720804541-01.1Wo
1 Air/Gas Manifold
2 Sensor - appliance flow
3 Flow pipe
4 Return pipe
5 Removable servicing panel
6 Electrode assembly
7 Overheat thermostat
8 Silicon tube - Heat Exchanger air vent
9HeatExchanger
10 Flue overheat thermostat
11 Access panel - Heat Exchanger/Sump cleaning
12 Return connector with drain point
13 Flow connector
14 Appliance Temperature control and Reset knob
15 Power and fault indicator (blue)
16 Wiring connections cover
17 Burner indicator (green)
18 Appliance ON/OFF switch
19 Condensate connection
20 Syphon / Trap
21 Gas inlet connection
22 Mains cable inlet
23 Gas Valve
24 Flue air pressure switch connection
25 Fan
26 Manual vent point
27 Fan pressure test point
28 Air pressure switch

APPLIANCE INFORMATION
6 720 821 670 (2018/06) 13
3.5 Internal wiring diagram
Fig. 2 Electrical diagram
[1] Air pressure switch
[2] Fan (fan wiring: Live = purple wire, Neutral = brown wire
[3] Flue overheat thermostat
[4] Flow temperature sensor (NTC)
[5] Flame sense electrode
[6] Spark electrodes
[7] Overheat thermostat
[8] External pump
[9] PCB
[10] External wiring center/junction box
[11] Earth bar connection
[12] Gas valve
SPARK
TRANSFORMER
DIAGNOSTIC
INTERFACE CODE
PLUG MODE
SWITCH
Slow 2 A fuse,
AC 230 V
EMS
BUS
CH TEMPERATURE
CONTROL
ON/OFF
SWITCH
ST9
ST6
ST5
ST2
ST1
F1
230V~
Min
Max
Norm
LN LP NP LR
Earth
11
COMMON
230V MAINS
SUPPLY
SL
L
N
6720644744-27.3Wo
4
10 8
9
1
2
12 3
5
6
7
Colour sequence 
Colour sequence 
Green
Live
Neutral
Red
Blue
Violet
Orange
Pump Live Pump Neutral Switched Live
LN LP LRNP
Installer connections
Connection Function
ST1 230V supply to the appliance
• Live input (L)
• Neutral input (N)
ST2 ExternalpumpsupplyconnectionsandSwitchedlive
(Live Return) to the appliance
•PumpLive(LP)
• Pump Neutral (NP)
• Demand input (LR)
Earth • Earth connection, appliance 230V supply
• Earth connection, external pump supply

PRE-INSTALLATION
6 720 821 670 (2018/06)14
4 PRE-INSTALLATION
4.1 MAINS SUPPLY
4.1.1 ELECTRICAL SUPPLY
• Supply: 230V - 50 Hz, 140 Watts
• Cable: PVC insulated 0.75mm2(24 x 0.2mm) temp. rated to 90 °C.
• External 3A fuse to BS1362.
• The appliance must be earthed.
• Do not connected the appliance to a 3 phase supply.
• IP20.
• Wiring must comply with the latest edition of BS 7671 (IET wiring
regulations).
4.1.2 GAS SUPPLY
To ensure that the equipment is in good working order and can meet the
gas flow and pressure requirements, in addition to the demand from any
other appliance being served, the following applies:
• Appliances using Natural Gas (NG) must be connected to a governed
meter.
• Liquid Petroleum Gas (LPG) must be connected to a regulator.
• Installation and connection of the gas supply to the appliance must be
in accordance with BS6891.
• Gas pipe sizing should be calculated to ensure no more than the
permitted mbar drop between the meter/governor to the appliance
inlet. (Commissioning section).
• The meter or regulator and pipe work to the meter must be checked,
preferably by the gas supplier.
4.2 WATER SYSTEMS AND PIPE WORK
PLASTIC PIPE WORK:
• Any plastic pipe work must have a polymeric barrier with 600mm
(minimum) length of copper pipe connected to the appliance.
• Plastic pipe work used for underfloor heating must be correctly
controlled with athermostaticblendingvalvelimiting thetemperature
of the circuits to approximately 50 °C.
PRIMARY SYSTEMS CONNECTIONS/VALVES:
• All system connections, taps and mixing valves must be capable of
sustaining a pressure up to 3 bar.
• Radiator valves should conform to BS2767:10.
• All other valves should conform to BS1010.
• It is best practice to fit Thermostatic Radiator Valves (TRV's) to all
radiators except the area where the room thermostat is sited which
must be fitted with lockshield valves that are left open.
• If the circulating pump speed is fixed and system circulation can be
significantly adjusted or stopped by TRV's or zone valves, a system
bypass should be installed to give at least a 3 metre circuit when
activated. However; any appliance fitted with a modulating pump
may not require a system bypass.
• A drain cock is required at the lowest point in the system.
• An air vent is required at all high points in the system.
OPEN VENT PRIMARY SYSTEM CONSIDERATIONS:
• The open vent pipe and feed and expansion pipe must rise
continuously from the appliance.
• Close coupled feed and expansion pipe maximum separation of
150mm.
• The feed and expansion cistern must be positioned to provide a
minimum static head of 250mm above the highest point in the
heating system to the water level in the feed and expansion cistern.
• Ensure adequate space is left in the expansion cistern for expansion
of the system water.
• No valve shall be fitted in the open vent pipe or the feed and
expansion pipe.
• The open vent pipe must be at least 22mmØ.
•Do not use galvanised pipes or radiators.
SEALED PRIMARY SYSTEM CONSIDERATIONS:
• The CH sealed system must be filled using a WRAS approved filling
loop or comply with figure 3 for system fill.
• An expansion vessel, of a size suitable for the system, must be fitted
as close as possible to the appliance in the central heating return.
• Also fit a pressure gauge, a 3 bar pressure relief valve and stop cock
(fixed cylinder type or sealed system approved connection).
• No valve shall be fitted that can isolate the appliance from the
expansion vessel or pressure relief valve.
• An automatic air vent must be fitted.
•Do not use galvanised pipes or radiators.
NOTICE: All the following Pre-Installation sections must
be read and requirements met before starting appliance
or flue installations.
CAUTION: Isolate the mains supplies before starting any
work and observe all relevant safety precautions.
NOTICE: To prevent reverse circulation
▶ The cylinder return must bethe last connection onthe
common return pipe.
NOTICE: Artificially softened water must not be used to
fill the central heating system.
Pump speed characteristics
▶ In order to save as much energy as possible and the
minimise the possibility of water circulation noise.
The circulating pump should be selected and
adjusted to suit the system resistance.

PRE-INSTALLATION
6 720 821 670 (2018/06) 15
SYSTEM FILL
Fig. 3 System fill/System make-up
S AND Y PLAN SYSTEMS:
SYSTEM LAYOUTS EXAMPLES:
S PLAN LAYOUT - OPEN VENT
Fig. 4 S plan open vent
Y PLAN LAYOUT - OPEN VENT
Fig. 5 Y plan open vent
NOTICE: Bypass considerations
▶ Appliances fitted with a modulating pump may not
require a system bypass.
1 Static head -
Minimum static head 250mm measured from the highest
point in the heating system (top surface of the appliance or
the highest point in the heating system) to the water level in
the feed and expansion tank
2 Heating vent (22mm minimum)
3 Primary cold feed (15mm minimum)
4 Diverter/Zone valve
5 Pump, maximum power 90 Watts
6 Automatic bypass
7 Radiator valve (Flow)
8 Lock shield valve (Return)
9 Expansion vessel
10 Pressure gauge
11 3 bar pressure relief valve
12 Stop cock
Table 9 Key to figures 4, 5, 6, 7 & 8
NOTICE: A drain cock should be fitted at the lowest
point of the heating circuit and beneath the appliance.
SYSTEM FILL
CV = Check Valve
SV = Stop Valve
SV SV
Test point
Temporary hose
Hose union CV
CV
Heating
return
Mains
supply
SYSTEM MAKE UP
AA = Auto Air vent
CV = Check Valve
SV
CV
AA
Make up
vessel
Heating
return
1000 mm (39 in)
above the highest
point of the system.
6720644743-08.2Wo
S PLAN LAYOUT
8
7
1
3
2
4
6
5
150 mm
max
M
M
reset max
6720644744-03.1Wo
Y PLAN LAYOUT
8
7
1
3
2
4
5
150 mm
max
reset max
M
6720644744-04.1Wo

PRE-INSTALLATION
6 720 821 670 (2018/06)16
SEALED SYSTEM Y PLAN LAYOUT
The central heating sealed system must be filled using a WRAS approved
filling loop or comply with figure 3 for System fill.
Fig. 6 Y plan sealed system
NEW BUILD SYSTEM LAYOUTS
Thelatest Part L1a regulationfor newinstallationsrequire separatezone
controls for the central heating.
Open vent with two heat zones
Fig. 7 Two heating zones open vent
Sealed system with two heat zones
Fig. 8 Two heating zones sealed system
4.3 Condensate discharge
For correct installation and trouble free operation of the appliance the
following advice should be followed:
1. All condensate pipework must ‘fall’ from the appliance by a minimum
of 3 degrees (52mm per metre) to ensure adequate Condensate flow.
2. The pipework route must allow air to be supplied back to the
appliance for correct operation of the siphon.
3. Connection to a rainwater down pipe must include an air break.
Also:
• Keep external pipework as short as possible and not exceed 3 metres
length.
• External pipework should be increased to a minimum diameter of
32mm and ideally be insulated.
• Minimise the number of bends and connectors.
• Remove burrs after cutting pipe.
• Remove surplus solvent from the interior of the pipe.
4.3.1 CONDENSATE PIPE WORK
SEALED SYSTEM LAYOUT
MCW
8
7
4
10
12
11
9
5
reset max
M
6720644744-05.1Wo
6720644744-61.1Wo
8
7
1
3
2
4
6
5
150 mm
max
M
reset max
MM
OPEN VENT LAYOUT
6720644744-62.1Wo
8
7
4
6
5
M
reset max
MM
SEALED SYSTEM LAYOUT
MCW 12
10 11
9
Full details on condensate discharge.
▶ Follow the latest version of BS6798 and HHIC
guidance.
NOTICE:
▶ Where a new or replacement appliance is being
installed, access to an internal “gravity discharge”
point should be one of the factors considered in
determining appliance location.
▶ The condensate pipe must be nominally
22mm Ø plastic pipe.
▶ The condensate pipe work must fall at least 52mm
per metre towards the outlet and should take the
shortest practicable route.
▶ Ensure there are no blockages in the pipe run.
NOTICE: Unheated internal areas.
Although the large volume siphon will reduce the risk of
freezing, condensate discharge may freeze in areas of
prolonged cold temperatures.
▶ Internal pipe runs in unheated areas such as lofts,
basements and garages should be treated as external
runs.
Key to condensate illustrations, figures 9, 10, & 11
1 Condensate discharge from appliance
2 Soil and vent stack
3 Minimum 450mm and up to three storeys
4 Visible air break at plug hole
5 Sink or basin with integrated overflow
6 75mm sink waste trap
7 Condensate pump
Table 10 Key to Internal condensate disposal methods

PRE-INSTALLATION
6 720 821 670 (2018/06) 17
4.3.2 INTERNAL CONNECTIONS
In order to minimise risk of freezing during prolonged cold spells, the
following methods of installing condensate drainage pipe should be
adopted, in order of priority.
Wherever possible, the condensate drainage pipe should be routed and
terminatedsothat thecondensatedrainsawayfromtheapplianceunder
gravity to a suitable internal foul water discharge point such as an
internal soil and vent stack. A suitable permanent connection to the foul
waste pipe should be used.
Fig. 9 Disposal to soil vent stack
Alternatively if the first option is not possible an internal kitchen,
bathroom or washing machine waste pipe etc. can be used.
Ensure that the condensate drain pipe is connected “down stream” of
the waste trap.
Fig. 10 Disposal to a waste pipe
CONDENSATE PUMP
Where “gravity discharge” to an internal termination is not physically
possible, or where very long internal runs would be required to reach a
suitable discharge point, condensate should be removed using a
proprietary condensate pump, of a specification recommended by the
appliance or condensate pump manufacturer.
The pump outlet pipe should discharge to a suitable internal foul water
discharge point such as an internal soil and vent stack or if not possible
to internal kitchen, bathroom or washing machine waste pipe etc. A
suitable permanent connection to the foul waste pipe should be used.
Fig. 11 Condensate pump disposal
6720644744-06.4Wo
22mm Ø
1
3
2
6720819188-03.3Wo
22mm Ø
75mm
min.
1
1
75mm
min.
22mm Ø
5
6
6
5
6720819188-12.2Wo
22mm Ø
2
1
73

PRE-INSTALLATION
6 720 821 670 (2018/06)18
4.3.3 External connection considerations
If no other discharge method is possible then the use of an externally run
condensate drainage pipe terminating at a suitable foul water discharge
point, or purpose-designed soak away, may be considered. If this
method is chosen then the following measures should be adopted:
▶ Use a CondenseSure siphon to help prevent the condensate freezing.
▶ The external run be kept as short as possible and not exceed 3
metres.
▶ The pipe should be run internally as far as possible before going
externally and the pipe diameter should be increased to 32mm
before it passes through the wall to the exterior. The pipe should be
insulated using suitable waterproof and weather resistant insulation,
if not using a CondenseSure siphon.
▶ The external pipe should take the shortest and least exposed route to
the discharge point, and should "fall" as steeply as possible away
from the appliance, with no horizontal runs in which condensate
might stand.
▶ The use of fittings, elbows etc. should be kept to a minimum and any
internal “burrs” on cut pipe work should be removed so that the
internal pipe section is as smooth as possible.
FITTING AN EXTERNAL AIR BREAK
• Refer to figure 12 when a rain water down pipe is used to dispose of
condensate.
• An air break must be installed in the 43mm pipe work, between the
appliancecondensate outletand the drainpipe,outsidethe property,
to avoid flooding during adverse weather conditions.
Fig. 12 Disposal into a rainwater down pipe
Where the pipe terminates over an open drain or gully, the pipe should
terminate below the grating level, but above water level, in order to
minimise “wind chill” at the open end.
The use of a drain cover (such as those used to prevent blockage by
leaves) may offer further protection from wind chill.
Pipe drainage will be improved if the end is cut at 45° as opposed to a
straight cut.
Fig. 13 External disposal
Fig. 14 Condensate pump to external disposal
NOTICE: Rainwater or external drain disposal
Untreated condensate must not be allowed to flow into
streams or rivers
▶ A rainwater down pipe or an external drain shall only
be used for condensate disposal it the down pipe or
external drain is connected to a combined foul and
rainwater system
▶ Refer to BS 6798 for more information
NOTICE: Grey water systems
Contamination of recovered water
▶ Condensate disposal shall not be allowed into a grey
water recovery system that is intended for re-use
NOTICE: Freezing conditions
▶ Pipeworklength should be kept toaminimum and the
route as vertical as possible.
▶ When required, use only weather proof insulation.
NOTICE: Condensate waste
▶ Careshouldbe taken when sitingasoak-away to avoid
causing damage to existing services.
Continued - Key to condensate illustrations, figures 12, 13, 14 &
15
1 Condensate discharge from appliance
7Condensatepump
8 Pipe work transition
9 Insulate and increase pipe size
10 External rain water pipe into foul water
11 External air break
12 Air gap
13 Strap-on fitting
14 43mm 90° male/female bend
15 100mm Ø minimum plastic pipe
16 Drainage holes
17 Limestone chippings
18 Bottom of sealed tube
19 Increase size of soak away with limestones chippings if in clay
soil area
Table 11 Key to external condensate disposal methods
Condensate drainage pipe can be run above or below
ground. If the pipe work is run under ground, care must
be taken to ensure that the pipe work “fall” towards the
disposal point is maintained
6720810188-05.5
22mm Ø 9
10
11
12
13
14
8
1
6720644744-10.4Wo
9
25mm min.
1
11
8
6720644744-12.4Wo
9
25mm min.
8
1
7

PRE-INSTALLATION
6 720 821 670 (2018/06) 19
CONDENSATE SOAK AWAY
• The condensate soak away must be sited at least 500mm away from
building footings.
• The condensate drainage pipe may be run above or below the ground
to the soak away. The examples shown on this page run above
ground.
• The soak away must use a 100mm Ø plastic tube with two rows of
three 12mm holes on 25mm centres and 50mm from the bottom of
the tube. The holes must face away from the house.
• The tube must be surrounded by at least 100mm of limestone
chippings to a depth of 400mm.
In situations where there are likely to be extremes of temperature or
exposure, the use of a proprietary trace-heatingsystem for external pipe
work, incorporating an external frost thermostat, should be considered.
If such a system is used, the requirement to use 32mm pipe does not
apply. However, all other guidance above and the instructions for the
trace heating system, should be closely followed.
Fig. 15 To a soakaway
4.4 PRESSURE RELIEF PIPE WORK
• The pressure relief discharge pipe [1 or 3] should be run in at least
15mm diameter copper pipe or pipe made of a material that will
withstand PRV discharge temperatures and pressures and which
complies to BS 5252 or BS EN 1451.
• The connection to the PRV must be made in copper pipe. Plastic pipe
work must be properly supported with a maximum of 300mm
between supports to prevent sagging and run downwards away from
the appliance.
• The pressure relief should discharge away from any electrical or
other hazard, preferably to an external drain or soak away.
• Pipe [1 or 3] should be finished with a partial bend, near the outlet to
face the external wall (as shown) to help prevent freezing.
Fig. 16 Pressure relief pipe work
[1] Discharge pipe (turned back onto external wall example)
[2] Outside wall
[1] Discharge pipe (into drain or gully example)
[4] External drain
4.4.1 Alternative PRV connections - Combined PRV/condensate
The PRV or a combined PRV/ condensate discharge can be connected
into a suitable internal waste system, the installer must ensure that all
the pipe work, including the waste pipe, is capable of withstanding PRV
temperatures and pressures.
Worcester, Bosch Group endorses a PRV or a combined PRV/
Condensate internal discharge system, provided that a Hotun hiflo
tundish is employed. The tundish is manufactured by RA Tech UK and is
WRAS approved, information on the tundish can be found at
www.hotun.co.uk.
The guidance of BS 6798 sections 6.3.5 and 6.4.3.2a and RA Tech UK
and must be followed.
Minimum holesizefor the condensatesoak away mustbe
400mm deep by 300mmØ .
NOTICE: Unheated internal areas.
▶ Internal pipe runs in unheated areas such as lofts,
basementsandgaragesshouldbe treated as external
runs and consideration should be given to using a
CondenseSure siphon.
6720819188-06.6Wo
500mm min.
25mm min.
400mm min.
9
16
18
17
19
15
15
16
1
8
11
NOTICE:
▶ The pressure relief valve is a safety device for the
applianceandif activated may discharge boiling water
or steam through the relief valve drain pipe.
▶ Care should be taken when siting the outlet pipe so
that it does not cause an obstruction or discharge
above a window, entrance or other public access
where it could cause a hazard.
1
2
3
4
2
3
4
1
2
6720646608-123.1Wo

PRE-INSTALLATION
6 720 821 670 (2018/06)20
4.5 APPLIANCE LOCATION AND CLEARANCES
4.5.1 Installation
Thisappliance is only suitablefor installing internally withinaproperty at
a suitable location onto a fixed, rigid surface at least the same size as the
appliance and capable of supporting the appliance weight.
The appliance must be installed where:
• An engineer can gain clear and safe access to work on the product or
component, including making adequate provision for visual
inspection of flues in voids.
• The homeowner can gain clear and safe access to the controls,
check, top up or reset the appliance.
• Products in loft cavities must have permanent fixed lighting, a
permanent fixed retractable ladder and a fixed floor area sufficient to
allow access for normal use and servicing directly under and around
the product and between and the access hatch.
4.5.2 SERVICING CLEARANCES -
VENTILATED COMPARTMENT
Figure 17 shows the minimum space required to install and service the
appliance in a ventilated compartment.
• If a appliance is installed in a compartment with clearances less than
shown in the tables 14, 15, or 16 ventilation is required. Refer to
table 12 for ventilation requirements.
Fig. 17 Ventilated compartment
4.5.3 COMPARTMENTS:
Follow the requirements of BS6798 and BS5440 Part 2 and note:
• Minimum clearances must be maintained.
• An access door is required to install, service and maintain the
appliance and any ancillary equipment.
• If the appliance is installed in an unventilated airing/storage
cupboard, there is no requirement to make a partition between the
appliance and the storage space as long as the minimum clearances
around the appliance are maintained.
• Ideally, storage should be belowthe appliance,wheretheapplianceis
mounted in the upper part of the cupboard, whilst maintaining the
clearances given in tables 14, 15, or 16.
4.5.4 APPLIANCE CLEARANCES- UNVENTILATED
COMPARTMENTS
4.5.5 INSTALLATION CLEARANCES - UNVENTILATED
COMPARTMENTS
No surface protection is required against heat transfer
from the appliance.
Vent position To room or internal
space
Direct to outside
High level Min. free area 122cm2Minimum free area 61cm2
Low level Min. free area 122cm2Minimum free area 61cm2
Table 12 Compartment ventilation
* Minimum clearance to removable door
** Minimum clearance required for servicing
Table 13 Minimum clearances
6720643895-121.2Wo
+ 30 mm
above elbow
930 mm 410 mm
20 mm*
600 mm**
5 mm
Using 100 mm
ue kit
1080 mm
Using 125 mm
ue kit
1100 mm
200 mm
5 mm
The tables below show the options for the minimum space required to
install and service the appliance inside an unventilated compartment.
CAUTION: CLEARANCES
▶ Top and bottom clearances must not be reduced
below the values shown in table 14 as they are the
minimum clearances required for servicing.
Unventilated Compartment Installation Clearances (millimetres)
Suggested total unventilated compartment minimum clearances are:
Side Above Below Front (to removable door)
400mm 170mm approx.
(30mm above elbow)
200mm 100mm
Table 14 Minimum unventilated compartment clearances
If Side Clearances are Reduced (millimetres)
If total side clearance is
reducedto: (Combined
left and right
clearances excluding
the appliance)
Increase height
clearances to (approx.):
(Combined top &
bottom clearances
excluding the
appliance)
OR Frontclearance
(to removable
door) must be
increased to:
350 441 129
300 523 161
250 617 200
200 717 243
150 856 295
100 1012 358
50 1202 434
Table 15 Reduced side clearances
If Front Clearance is Reduced (millimetres)
If front clearance
(to removable
door) is reduced
to:
Increase overall height
clearances to
(approx.):
(Combined top and
bottom clearances
excluding the
appliance)
OR Increase total side
clearance to:
(Combined left and
right clearances
excluding the
appliance)
50mm 511mm 505mm
25mm 596mm 569mm
Table 16 Reduced front clearances