Benchmark 27i System Compact User guide

UK/IE
INSTALLATION, COMMISSIONING AND SERVICING INSTRUCTIONS
WALL HUNG RSF GAS FIRED CONDENSING SYSTEM BOILER
Greenstar i System Compact ErP
6720646608-00.1Wo
FOR SEALED CENTRAL HEATING SYSTEMS AND INDIRECT MAINS FED DOMESTIC HOT WATER
6 720 813 280 (2015/07)
If you smell gas:
▶ Well away from the building: call the National Gas Emergency
Service on 0800 111 999.
▶ L.P.G. boilers: Call the supplier’s number on the side of the gas tank.
These appliances are for use with:
Natural Gas or L.P.G.
(Cat. II 2H 3P type C13, C33 & C53)
Model GC Number
Natural Gas 27i System Compact ErP 41-406-58
30i System Compact ErP 41-406-60
L.P.G. 27i System Compact ErP 41-406-59
30i System Compact ErP 41-406-61

CONTENTS
Greenstar i System Compact ErP - 6 720 813 280 (2015/07)2
CONTENTS
1 Key to symbols and safety instructions . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4 Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Pre-installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Cleaning primary systems . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Mains supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.1 Electrical supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.2 Gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3 Water systems and pipework . . . . . . . . . . . . . . . . . . . . 12
4.3.1 S and Y plan systems . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3.2 Existing installations . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3.3 New installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.4 Condensate pipework . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4.1 Internal connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4.2 External connections . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.5 Pressure relief pipework . . . . . . . . . . . . . . . . . . . . . . . . 16
4.6 Boiler location and clearances . . . . . . . . . . . . . . . . . . . 17
4.6.1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.6.2 Installation and servicing clearances . . . . . . . . . . . . . . 17
4.6.3 Compartments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.6.4 Bathrooms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7 Plumbing manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.1 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.8 Flue terminal positions . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.9 Flue options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.9.1 Flue lengths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.10 Plume management terminal positions . . . . . . . . . . . . 22
4.10.1 Determine the plume management system length . . . 23
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.1 Unpacking wall frame & ancillary items . . . . . . . . . . . . 24
5.2 Wall mounting template & flue openings . . . . . . . . . . . 24
5.3 Unpacking the appliance . . . . . . . . . . . . . . . . . . . . . . . 25
5.4 Pre-plumbing boiler connections . . . . . . . . . . . . . . . . . 26
5.5 Hanging the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.6 Flue turret/adaptor installation . . . . . . . . . . . . . . . . . . 28
5.7 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.7.1 Mounting optional plug-in controls - when optional
integral diverter valve is fitted . . . . . . . . . . . . . . . . . . . . 30
6 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.1 Pre-commissioning checks . . . . . . . . . . . . . . . . . . . . . . 34
6.2 Filling the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.3 Water treatment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.4 Starting the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6.4.1 Boiler start up screens . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.5 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.5.1 Checking the gas inlet pressure . . . . . . . . . . . . . . . . . . . 37
6.5.2 Checking the gas rate . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.5.3 Gas rating test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.5.4 Checking for leaks during operation . . . . . . . . . . . . . . . 38
6.6 Domestic hot water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.7 CO and Combustion checks . . . . . . . . . . . . . . . . . . . . . . 39
6.8 Finishing commissioning . . . . . . . . . . . . . . . . . . . . . . . . 40
6.8.1 Replacing the boiler case . . . . . . . . . . . . . . . . . . . . . . . . 40
6.8.2 Securing the control panel . . . . . . . . . . . . . . . . . . . . . . . 40
6.8.3 Fitting the fascia flap . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.8.4 Installing the bottom panel . . . . . . . . . . . . . . . . . . . . . . . 40
6.8.5 Handover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.8.6 Boiler guarantee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
7 Service and spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
7.1 Inspection and service . . . . . . . . . . . . . . . . . . . . . . . . . . 41
7.2 Checking the gas inlet pressure . . . . . . . . . . . . . . . . . . . 42
7.3 Checking flue integrity . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7.4 Component access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.5 Fan pressure test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.5.1 Setting the boiler to maximum . . . . . . . . . . . . . . . . . . . . 43
7.5.2 Fan pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
7.6 Flue gas analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
7.7 Cleaning the heat exchanger . . . . . . . . . . . . . . . . . . . . . 45
7.7.1 Cleaning the siphon . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7.7.2 Cleaning the primary heat exchanger . . . . . . . . . . . . . . 46
7.8 Replacement of parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.8.1 Removing the outer case . . . . . . . . . . . . . . . . . . . . . . . . 47
7.8.2 Draining the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.8.3 Siphon removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.8.4 Primary sensor (CH NTC) . . . . . . . . . . . . . . . . . . . . . . . . 48
7.8.5 Maximum safety sensor . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.8.6 Flue overheat thermostat . . . . . . . . . . . . . . . . . . . . . . . . 48
7.8.7 AIR PRESSURE SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . 49
7.8.8 Auto air vent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7.8.9 Gas valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7.8.10 Fan assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
7.8.11 Air/gas flap valve assembly . . . . . . . . . . . . . . . . . . . . . . 51
7.8.12 ignition transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.8.13 Electrode assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.8.14 Burner housing, burner/ gasket . . . . . . . . . . . . . . . . . . . 52
7.8.15 Heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7.8.16 Diverter valve motor and diverter valve removal . . . . . 54
7.8.17 Pump head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7.8.18 Pressure gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7.8.19 Boiler return sensor (NTC) . . . . . . . . . . . . . . . . . . . . . . . 55
7.8.20 Drain tap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.8.21 CH pressure relief valve . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.8.22 Hydraulic block removal . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.8.23 Bypass valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
7.8.24 Access to boiler control components . . . . . . . . . . . . . . 56
7.8.25 Replacing the control unit . . . . . . . . . . . . . . . . . . . . . . . . 56
7.8.26 Expansion vessel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
7.9 Short parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

CONTENTS
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8 Fault finding and Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
8.1 Internal wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . 60
8.2 Heating function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8.3 Protection functionS . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
8.4 Information and service menus . . . . . . . . . . . . . . . . . . . 63
8.4.1 Selecting the information menu . . . . . . . . . . . . . . . . . . 64
8.4.2 Selecting service menus . . . . . . . . . . . . . . . . . . . . . . . . 65
8.4.3 Menu 1 - System parameters . . . . . . . . . . . . . . . . . . . . 66
8.4.4 Menu 2 - Boiler parameters . . . . . . . . . . . . . . . . . . . . . . 66
8.4.5 Reset to factory settings . . . . . . . . . . . . . . . . . . . . . . . . 67
8.4.6 Menu 3 - Boiler maximum & minimum limits . . . . . . . . 67
8.4.7 Using the test menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
8.5 Fault codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

KEY TO SYMBOLS AND SAFETY INSTRUCTIONS
Greenstar i System Compact ErP - 6 720 813 280 (2015/07)4
1 Key to symbols and safety instructions
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.
Æe.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
Æa 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
Electrical 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.

KEY TO SYMBOLS AND SAFETY INSTRUCTIONS
Greenstar i System Compact ErP - 6 720 813 280 (2015/07) 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.
▶ L.P.G. boilers: Call the supplier’s number on the side of the gas tank.
Appliance operation:
This appliance can be used by children aged from 8 years and above and
persons with reduced physical, sensory or mental capabilities or lack of
experience and knowledge, if they have been given supervision or
instruction concerning the use of the appliance, in a safe way, and
understand the hazards involved.
Children shall not play with the appliance.
Cleaning and user maintenance shall not be made by children without
supervision.
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.
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

REGULATIONS
Greenstar i System Compact ErP - 6 720 813 280 (2015/07)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)
L.P.G. Installations
An appliance using L.P.G. 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
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3 APPLIANCE INFORMATION
3.1 Appliance
STANDARD PACKAGE
1. Wall hung gas-fired condensing system boiler for central heating and domestic hot water
2. Wall mounting frame
3. Hardware literature pack:
– Greenstar i System Compact ErP Installation, Commissioning and Servicing Instructions
–Userguide
– Boiler fascia guide
– Wall mounting template
– Condensate connector
– Sealing Pack
4. ErP Label
5. PRV Installer connection elbow
6. Bottom panel
7. Fascia panel
* 690mm to top of case front
680mm*
390mm
280mm
6720813280-02.1Wo
2
6
7
Depth to wall
(When fitted to wall frame)
3
1
5
4

APPLIANCE INFORMATION
Greenstar i System Compact ErP - 6 720 813 280 (2015/07)8
3.2 TECHNICAL DATA
DESCRIPTION i System Compact Natural Gas L.P.G.
UNIT 27kW 30kW 27kW 30kW
Gas flow rate - Max. 10 minutes from lighting
Natural Gas G20 m³/h 2.92 3.24
L.P.G. kg/h 2.1 2.33
Heating
Minimum heat input kW 7.15 7.15 7.15 7.15
Maximum rated heat input (net) kW 27.58 30.65 27.58 30.65
Maximum rated heat output 40/30°C kW 28.55 31.70 28.55 31.70
Maximum rated heat output 50/30°C kW 28.4 31.57 28.4 31.57
Maximum rated heat output 80/60°C kW 27.0 30.0 27.0 30.0
Maximum flow temperature °C 82 82 82 82
Maximum possible flow temperature °C 86 86 86 86
Maximum permissible operating pressure bar 2.5 2.5 2.5 2.5
Available pump head at 21°C system temperature rise m 2.0 2.0 2.0 2.0
Flue
Flue gas temperature 80/60°C, rated/min. load °C 67/64 70/64 69/66 72/66
Flue gas temperature 40/30°C, rated/min. load °C 48/36 50/36 50/37 52/37
CO2level at max. rated heat output (after 30 minutes) % 9.1 9.1 10.6 10.6
CO2level at min. rated heat output (after 30 minutes) % 8.5 8.5 9.6 9.6
NOx class 5555
NOx rating mg/kWh 35 35 40 42
Condensate
Maximum condensate rate l/h 2.5 2.5 2.5 2.5
pH value, approx. 4.8 4.8 4.8 4.8
Electrical
Electrical power supply voltage a.c. V 230 230 230 230
Frequency Hz 50 50 50 50
Maximum power consumption - running W 102 109 102 109
Maximum power consumption - stand-by W 1111
General data
Appliance protection rating IP X4D X4D X4D X4D
Appliance protection rating with FW100 module fitted* IP IP20 IP20 IP20 IP20
Appliance protection rating with Sense II module fitted* IP IPX2D IPX2D IPX2D IPX2D
Permissible ambient temperatures °C 0 - 50 0 - 50 0 - 50 0 - 50
Nominal capacity of appliance litre 2.1 2.1 2.1 2.1
Total boiler weight kg 37.5 37.5 37.5 37.5
Lift weight kg 27.3 27.3 27.3 27.3
SEDBUK 2005 Band AAAA
SEDBUK 2009 % 89.0 89.0 90.0 90.0
Table 4 Technical data i System Compact
* used with the optional integral diverter valve kit.

APPLIANCE INFORMATION
Greenstar i System Compact ErP - 6 720 813 280 (2015/07) 9
3.3 ENERGY EFFICIENCY
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 7733600060 7733600062 7733600061 7733600063
Product type – – 27i System
Compact ErP NG
30i System
Compact ErP NG
27i System
Compact ErPLPG
30i System
Compact ErP LPG
Condensing boiler – – Yes Yes Yes Yes
Low temperature boiler – – No No No No
B1 boiler – – No No No No
Cogeneration space heater (CHP) – – No No No No
Combination heater – – No No No No
Rated heat output Prated kW 27 30 27 30
Seasonal space heating energy efficiency Ks%92929292
Energyefficiencyclass ––AAAA
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.
P4kW 27 30 27 30
At 30% of rated heat 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).
P1kW 8.9 9.9 8.9 9.9
Useful efficiency
At rated heat output and high temperature regime 1) K4% 88.2 88.2 88.2 88.2
At 30% of rated heat output and low temperature
regime 2) K1% 97.3 97.3 97.3 97.3
Auxiliary electricity consumption
At full load elmax kW 0.033 0.04 0.033 0.04
At part load elmin kW 0.014 0.014 0.014 0.014
In standby mode PSB kW 0.001 0.001 0.001 0.001
Other items
Standby heat loss Pstby kW 0.078 0.078 0.078 0.078
Ignition burner power consumption Pign kW0000
Emissions of nitrogen oxides NOx mg/kWh 32 32 32 32
Annual energy consumption QHE kWh - - - -
Sound power level, indoors LWA dB(A)53555355
Table 5 Product data for energy consumption according to the EU regulations no. 811/2013 and no. 813/2013

APPLIANCE INFORMATION
Greenstar i System Compact ErP - 6 720 813 280 (2015/07)10
3.4 LAYOUT
Fig. 1 Main boiler components
6720813280-03.1Wo
44 43 42 41 40
39
38
37
36
35
27
50
49
48
47
45
46
30
29
28
31
7
32
34
9
33
8
11
12
13
14
1
2
3
4
5
6
16 17 18 19
20
2324
22
25
26
15
21
10

PRE-INSTALLATION
Greenstar i System Compact ErP - 6 720 813 280 (2015/07) 11
4 PRE-INSTALLATION
4.1 CLEANING PRIMARY SYSTEMS
1 Wall mounting frame 26 Boiler display
2 Expansion vessel 27 Fan
3 CH return isolator 28 Flow temperature sensor (NTC)
4 Gas inlet isolator 29 Electrode assembly
5 CH flow isolator 30 Maximum safety sensor NTC
6Condensateconnection 31 Auto air vent
7 Flue connector 32 Aluminium Silicon Heat exchanger
8 Case retaining clips 33 Flueway
9 Flue overheat thermostat 34 Sump assembly
10 Air Pressure Switch 35 Pressure gauge connection point
11 Main superstructure 36 Diverter valve actuator blank
12 Case 37 Diverter valve body
13 Case retaining screws 38 Modulating pump
14 Bottom panel 39 Drain point
15 Control, top panel 40 CH return connection to service valve
16 Menu buttons 41 PRV
17 Blank for optional programmer 42 Gas connection to service valve
18 Diagnostic port (for Worcester service engineers) 43 CH flow connection to service valve
19 Pressure gauge 44 Condensate discharge pipe
20 DHW temperature control* 45 Siphon
21 Boiler identification label 46 Expansion vessel connection point
22 Operation/fault diagnostic light (blue) 47 Return temperature sensor (NTC)
23 Control panel flap 48 Gas valve
24 Boiler fascia guide location 49 Combustion air inlet
25 CH temperature control 50 Ignition transformer
Table 6 Boiler components
* DHW temperature control.
The optional Integral Diverter Valve kit with cylinder
sensor is required to enable the hot water temperature
control to be used.
The table below lists:
▶ the accessories that can be fitted when the integral
diverter valve is fitted.
▶ with which accessory the DHW control is exclusively
responsible for the stored DHW temperature.
DHW control exclusively
responsible
Accessory
Integral diverter
valve
Externaldiverter
valve
DT10 RF Digistat YES N/A
DT10 RF Optimiser YES N/A
DT20 YES N/A
DT20 RF YES N/A
FR110 NO N/A
FW100 NO N/A
Comfort I RF YES N/A
Comfort II RF YES N/A
Comfort YES N/A
Sense I YES N/A
Sense II NO N/A
Worcester Wave YES N/A
Table 7
The FR110, FW100 and Sense II provide an additional
levelof control overthe DHWset point,allowing the DHW
set point to be adjusted at these controls and not only via
the DHW temperature control knob on the boiler’s facia.
With these controls, the boiler facia’s control knob,
becomes the maximum temperature limiter. If this is set
too low, the DHW set point on the control cannot be
achieved.
CAUTION:
▶ ISOLATE THE MAINS SUPPLIES BEFORE STARTING
ANY WORK AND OBSERVE ALL RELEVANT SAFETY
PRECAUTIONS.
NOTICE: All the following pre-installation sections must
be read and requirements met before starting the boiler
or flue installations.
NOTICE: Water treatment
▶ Debris from the system can damage the boiler and
reduce efficiency. Failure to comply with the
guidelines for the use of water treatment with the
appliance will invalidate the appliance guarantee and
contravene the Building Regulations.
▶ It is recommended that you fit a primary water
cleanser to the system. Worcester recommends
fitting a filter that will help remove both magnetite and
non-magnetic debris.

PRE-INSTALLATION
Greenstar i System Compact ErP - 6 720 813 280 (2015/07)12
BEFORE CLEANING THE SYSTEM:
▶ Ensure that the system and pipework is in good working order.
▶Where possible keep the existing boiler/circulating pump in place
when flushing the system.
FOLLOW THE GUIDANCE OF BS7593:
Treatment of water in domestic hot water central heating and also the
flushing guidelines below.
FLUSHING THE SYSTEM
▶ Fill the system with cold water and check for leaks.
▶ Open all drain cocks and drain the system.
▶ Close drain cocks and add a suitable flushing agent compatible with
aluminium at the correct strength for the system conditions in
accordance with the manufacturer‘s instructions.
The pH value of the system water must be less than 8 or the
appliance guarantee will be invalidated.
▶ Circulate the flushing agent before the boiler is fired up.
▶ Runthe boiler/system atnormal operatingtemperatureas directed by
the manufacturer of the flushing agent.
▶ Drain and thoroughly flush the system to remove the flushing agent
and debris.
▶ It may be necessary to use a power flushing machine to aid the
cleansing procedure in some circumstances.
▶ Close the drain cocks and refill with fresh water and a suitable
inhibitor.
▶ Vent any air from the boiler and system.
INHIBITOR
Add a suitable inhibitor or combined inhibitor/anti-freeze, if the system
is exposed to freezing conditions, to the heating system in accordance
with the DWTA code of practice and manufacturer‘s guidelines.
WATER TREATMENT PRODUCTS
Suitable water treatment products can be obtain from the following
manufacturers:
•FERNOX - 0870 601 5000 or www.fernox.com
•SENTINEL - 0800 389 4670 or www.sentinel-solutions.net
ARTIFICIALLY SOFTENED WATER
It is possible to have an ion exchange water softener fitted to the cold
water system of the property. However, the boiler requires an untreated
cold water connection taken from the mains supply, before the water
softener, to the primary water filling point of the heating system.
4.2 MAINS SUPPLY
4.2.1 ELECTRICAL SUPPLY
• Supply: 230V - 50 Hz
• Cable: PVC insulated 0.75mm2(24 x 0.2mm) rated to 90 °C
• External 3A fuse to BS1362.
• The boiler must be earthed.
• This boiler must not be connected to a 3 phase supply.
• IPX4D.
• Wiring must comply with the latest edition of BS 7671 (IET wiring
regulations).
4.2.2 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:
• Boilers 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 boiler 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. (ÆCommissioning section).
• The meter or regulator and pipe work to the meter must be checked,
preferably by the gas supplier.
4.3 WATER SYSTEMS AND PIPEWORK
PLASTIC PIPEWORK:
• Any plastic pipework must have a polymeric barrier with 600mm
(min.) length of copper pipe before being connected to the boiler.
• Plastic pipework used for underfloor heating must be correctly
controlled with a thermostatic blending valve, limiting the
temperature 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.
• Thermostatic radiator valves (TRV’s) must be fitted to all rooms
except bathrooms and the room with the room thermostat.
• A drain cock is required at the lowest point(s) in the system.
• An air vent is required at the high point(s) in the system.
NOTICE: Artificially softened water must not be used to
fill the central heating system.
WARNING: Sealing agents
▶ Normally the addition of sealing agents to the system
water is not permitted as this can cause problems
with deposits left in the heat exchanger.
▶ In cases where all attempts to find a micro leak have
failed, Worcester, Bosch Group supports the use of
Fernox F4 leak sealer.
NOTICE: IP rating change;
This is reduced to IP20 if the following control is fitted
FW100 7 716 192 067.
This is reduced to IPX2D when the Sense II
7 738 111 064 is fitted.
The boiler is equipped with an internal by-pass.
The internal bypass is not intended to be a substitute for
an external system bypass.
An external automatic bypass should be used if the
system flow can be significantly adjusted or stopped by
zone valves and thermostatic radiator valves (TRV).

PRE-INSTALLATION
Greenstar i System Compact ErP - 6 720 813 280 (2015/07) 13
SEALED PRIMARY SYSTEM:
• The CH sealed system must be filled using a WRAS approved filling
loop or comply with figure 2 for system fill.
• Where the system volume is more than 100 litres or exceeds 2.65 bar
at maximum heating temperature, an extra expansion vessel (2) must
be fitted as close as possible to the appliance in the central heating
return.
• Pressurise the extra expansion vessel (2) to the same figure as the
expansion vessel built into the appliance.
•Do not use galvanised pipes or radiators.
SYSTEM FILL
Fig. 2 System fill
Fig. 3 Additional expansion vessel
[1] Appliance expansion vessel - CH
[2] Extra expansion vessel - CH return
[3] Pressure relief discharge
OPTIONAL DIVERTER VALVE
This boiler is designed to operate on a sealed system only. The boiler will
require a second return pipe from the water cylinder to the wall
mounting frame and terminate in 15mm copper pipe.
4.3.1 S AND Y PLAN SYSTEMS
4.3.2 EXISTING INSTALLATIONS
S PLAN LAYOUT
Y PLAN LAYOUT
SYSTEM LAYOUT WITH OPTIONAL INTERNAL DIVERTER VALVE
(NOT SUPPLIED WITH BOILER)
[1] Diverter valve
[2] Radiator valve (flow)
[3] Lock shield valve (return)
[4] Bypass
4.3.3 NEW INSTALLATIONS
S PLAN PLUS LAYOUT
NOTICE: Artificially softened water must not be used to
fill the central heating system.
The boiler is equipped with an internal by-pass.
The internal bypass is not intended to be a substitute for
an external system bypass.
An external automatic bypass should be used if the
system flow can be significantly adjusted or stopped by
zone valves and thermostatic radiator valves (TRV).
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
1
2
3
6720644743-09.1Wo
NOTICE: Automatic bypass
▶ An automatic bypass valve is required when fitting an
S-plan type system with two-port valves.
NOTICE: Drain cock
▶ A drain cock should be fitted at the lowest point(s) of
the heating circuit and beneath the appliance.
3
2
1
4
M
M
3
2
1
M
6720646609-33.1Wo
Heating flow
Cylinder return
Cylinder flow
Heating return
F
R
3
2
F
R
3
2
1
4
M
MM

PRE-INSTALLATION
Greenstar i System Compact ErP - 6 720 813 280 (2015/07)14
AVAILABLE PUMP HEAD
The pump map can be selected within 2.1C in the Boiler settings menu
list:
•0(pump variable speed setting)
•1(constant pressure low)
•2(constant pressure low/middle)
•3(constant pressure middle/high)
•4(constant pressure high)
The factory setting is:
4(constant pressure high)
CONSTANT PRESSURE HEAD
If the constant pressure head option (1 - 4) is chosen, the differential
pressure between the CH flow and return will be kept at the
corresponding value. When the CH system is cold and the radiator TRVs
are fully open, the pump will be running faster to try and maintain the
pressure differential. When the TRVs start to close and the resistance of
the CH system increases, the pump speed reduces to maintain the
pressure.
The setting (1 - 4) to be selected is dependent upon the resistance and
heatload of the CHsystem. Thehigherthese are, thehigher the pressure
constant
4.4 CONDENSATE PIPEWORK
4.4.1 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
terminated so that the condensate drains away from the boiler under
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. 4 Disposal to soil vent stack
Alternatively if the first option is not possible an internal kitchen or
bathroom waste pipe, washing machine waste pipe etc. can be used.
Ensure that the condensate drain pipe is connected “down stream” of
the waste trap.
Fig. 5 Disposal to a waste pipe
In order to save as much energy as possible and the
minimise the possibility of water circulation noise, a low
characteristic should be chosen.
NOTICE:
▶ Where a new or replacement boiler is being installed,
access to an internal “gravity discharge” point should
be one of the factors considered in determining boiler
location.
▶ The condensate pipe must be nominally
22mm Ø plastic pipe.
▶ The condensate pipework 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.
Key to condensate illustrations
1 Condensate discharge from boiler
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
7Condensatepump
* Condensate trap of 75mm already incorporated into the boiler
400 600 800 1000 1200 1400 1600
0.8
0.6
0.7
0.5
0.4
0.3
0.2
0.1
0
4
3
2
1
6720813276-13.1Wo
Flow Rate (l/hr)
Pressure (bar)
0200
2
22mm Ø
1
3
6720644744-06.3Wo
100mm
75mm
min.
4
5
6
1
22mm Ø
6720644744-07.3Wo

PRE-INSTALLATION
Greenstar i System Compact ErP - 6 720 813 280 (2015/07) 15
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
boiler 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, internal kitchen
or bathroom waste pipe, washing machine waste pipe etc. A suitable
permanent connection to the foul waste pipe should be used.
Fig. 6 Condensate pump disposal
4.4.2 EXTERNAL CONNECTIONS
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
externallyand thepipediameter shouldbe increasedto 32mmbefore
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 boiler, 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 pipework should be removed so that the
internal pipe section is as smooth as possible.
FITTING AN EXTERNAL AIR BREAK
• Refer to figure 7 when a rain water down pipe is used to dispose of
condensate.
• An air break must be installed in the 43mm pipework, between the
boiler condensate outlet and the drainpipe, outside the property, to
avoid flooding during adverse weather conditions.
Fig. 7 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. 8 External disposal
NOTICE: Freezing conditions
▶ When the position of the boiler prevents internal
routing, we recommend installing a CondenseSure
siphon to significantly reduce the risk of freezing.
▶ Pipework length should be kept to a minimum and the
route as vertical as possible.
▶ Weather proof insulation must be used, if not using a
CondenseSure siphon.
NOTICE: Condensate waste
▶ Careshould be takenwhen sitinga soak-awayto avoid
obstructing existing services.
Continued - Key to condensate illustrations
8 PVCu strap on fitting
9 100mm Ø minimum plastic pipe
10 Drainage holes
11 Limestone chippings
12 Bottom of sealed tube
13 Insulate and increase pipe size
14 Pipework transition
15 External air break
16 Air gap
17 External rain water pipe into foul water
18 43mm 90° male/female bend
* Condensate trap of 75mm already incorporated into the boiler
75mm
min.
4
7
5
6
1
22mm Ø
6720644744-08.3Wo
Condensate drainage pipe can be run above or below
ground.
18 8
13
14
17
15
16
1
6720644744-09.3Wo
25mm min.
14
13
1
6720644744-10.3Wo

PRE-INSTALLATION
Greenstar i System Compact ErP - 6 720 813 280 (2015/07)16
Fig. 9 Condensate pump to external disposal
CONDENSATE SOAK AWAY
• 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-heating system for external
pipework, 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. 10 Soak away
4.5 PRESSURE RELIEF PIPEWORK
• The pressure relief drain pipe (1) from the boiler should be at least
15mm diameter copper pipe and run downwards, away from any
electrical equipment or other hazard, preferably to an external drain
or soak away.
• The pressure relief drain pipe (1) should be finished with a partial
bend, near the outlet to face the external wall (as shown) to help
prevent freezing.
Fig. 11 Pressure relief pipework
[2] Outside wall
[1, 3] PRV drain pipe
[4] External drain
Minimumhole sizefor thecondensatesoak awaymust be
400mm deep by 300mmØ .
NOTICE: Unheated internal areas.
▶ Internal pipe runs in unheated areas such as lofts,
basements and garages should be treated as external
runs and consideration should be given to using a
CondenseSure siphon.
25mm min.
14 13
1
7
6720644744-12.3Wo
13
14
10
500mm min.
25mm min.
400mm
min.
1
12
11
9
6720644744-11.2Wo
9
10
*
NOTICE:
▶ The pressure relief valve is a safety device for the
boiler and if 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
Greenstar i System Compact ErP - 6 720 813 280 (2015/07) 17
4.6 BOILER LOCATION AND CLEARANCES
4.6.1 Installation
Thisappliance is onlysuitable forinstallinginternally withina property 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.
4.6.2 INSTALLATION AND SERVICING CLEARANCES
Fig. 12 Unventilated compartment
[*] Minimum clearance to removable door
[**] Minimum clearance required for servicing
[***] Height for either 60/100 flue or 80/125 flue
4.6.3 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 boiler
and any ancillary equipment.
• If fitting the boiler into an airing cupboard use a non-combustible
material to separate the boiler from the airing space.
The material can be perforated up to a maximum hole size of 13mm.
4.6.4 BATHROOMS
Please check the IP rating of any control to be used on this appliance.
Only certain controls can be fitted when the appliance is inside of the
shaded area.
An appliance with blanking panel or controls that do not change the IP
rating can be installed in zone 2.
Additional RCD (Residual Current Device) protection may be required.
Consult the latest version of BS7671 (IET wiring regulations).
Fig. 13 Bathroom installations
4.7 PLUMBING MANIFOLD
4.7.1 CONNECTIONS
• If the boiler pipes are to be run behind the appliance ensure that the
pipes pass either side of the expansion vessel as shown in figure 15.
• For further ease of fitting, an optional Vertical Pre-piping Assembly kit
is available, comprising three pre-formed copper pipes and a cross
bonding strip. Part number: 7 716 192 712.
Fig. 14 Pipe dimensions
No surface protection is required against heat transfer
from the appliance.
1060/1100mm***
880mm
300mm
400mm
170/210mm***
600mm**
5mm
5mm
200mm
20mm*
6720646608-122.1Wo
2* Without the end wall, zone 2 must extend 600mm from the bath
Further guidance on pipe routing can be found printed
on the boiler template (supplied with the boiler).
6720646608-124.2Wo
2*
Radius 600mm
Radius
600mm
2
1
22
2
12
2
2
1
600mm
600mm 600mm
750mm
2250mm
2250mm
2*
6720646609-05.1Wo
1 2 3 4 5

PRE-INSTALLATION
Greenstar i System Compact ErP - 6 720 813 280 (2015/07)18
Fig. 15 Plumbing manifold
Use the fittings supplied in the Hardware literature pack.
#Function
From left
case edge
Diameter of
pipe
1Condensate 33mm 22mm
2CHFlow 65mm 22mm
3Gas 195mm 22mm
4 Pressure Relief Valve 291mm 15mm
5CHReturn 325mm 22mm
Table 8 Key to figures 14 & 15
Heating System 22mm compression fittings
Gas 22mm compression fittings
Condensate 22mm rubber push fit connector
PRV 15mm (fittings not supplied)
6720646609-06.2Wo
1
25
2 3 5
4

PRE-INSTALLATION
Greenstar i System Compact ErP - 6 720 813 280 (2015/07) 19
4.8 FLUE TERMINAL POSITIONS
Fig. 16 Flue terminal positions
Key to illustration
1. 300mm adjacent to a boundary line.
2. The dimension below eaves, gutters, pipes and drains can be
reduced to 25mm, as long as the flue terminal is extended to clear
any overhang. External flue joints must be sealed with suitable
silicon sealant.
3. 1,500mm between a vertical flue terminal and a window or dormer
window.
4. 1,200mm between terminals facing each other.
5. Vertical flue clearance, 300mm adjacent to aboundary line unless it
will cause a nuisance. BS 5440:Part 1 recommends that care is
taken when siting terminal in relation to boundary lines
6. 600m distance to a boundary line, unless it will cause a nuisance.
BS5440:Part1recommends thatcareistakenwhen sitingterminal
in relation to boundary lines.
7. 600mm minimum clearance from a skylight to a vertical flue.
8. Vertical flue clearance, 500mm to non-combustible building
material, and 1,500mm clearance to combustible building material.
9. 300mm above, below and either side of an opening door, air vent or
opening window.
10. 600mm diagonally to an opening door, air vent or opening window.
11. 300mm to an internal or external corner. This does not apply to
building protrusions less than 450mm.
12. 2,000mm below a Velux window, 600mm above or to either side of
the Velux window.
13. 400mm from a pitched roof or 500mm in regions with heavy snow
fall.
14. 500mm clearance to any vertical structure on a roof, 600mm to
room sealed flue or 1,500 to an open flue.
15. 200mm below eaves and 75mm below gutters, pipe and drains.
16. The dimension below eaves, balconies and car ports can be
reduced to 25mm, as long as the flue terminal is extended to clear
any overhang. External flue joints must be sealed with suitable
silicon sealant.
17. Flue clearance must be at least 300mm from the ground. Terminal
guards must be fitted if the flue is less than 2 metres from the
ground or if a person could come into contact with the flue
terminal.
18. 600mm distance to a surface facing a terminal, unless it will cause
a nuisance. BS 5440: Part 1 recommends that care is taken when
siting terminals in relation to surfaces facing a terminal.
16
600
300
200
300
1,200
Boundary Line
1,500
1,500
All measurements in millimetres
2
1
12
11
10
9
5
18
7
6
13
15
4
3
17
14
300 300
300 300
300
300 300
500
600
300
600
600
400
300
25
8
300
500
600
6720643895-13.3Wo
300
25
225 16
2m
1m
52mm 104mm
NOTICE:
▶ All measurements are the minimum clearances required.
▶ Terminals must be positioned so to avoid combustion products entering the building.
▶ Support the flue at approximately one metre intervals and at a change of direction, use suitable brackets and fittings.
(flue bracket 100mm part number: 7 716 191 177,
flue brackets 100mm x 6 part number: 7 716 191 178,
flue bracket 125mm part number: 7 716 191 179).
Note:
▶ Installations in car ports are not recommended.
▶ The flue cannot be lower than 1,000mm from the top
of a light well due to the build up of combustion
products.
▶ Dimensions from a flue terminal to a fanned air inlet
to be determined by the ventilation equipment
manufacturer.
▶ A flue terminal guard should be fitted over a terminal,
if persons could come into contact with the terminal,
or it could be subject to damage and where the
terminal is less than 2,000mm from the finished floor
level.

PRE-INSTALLATION
Greenstar i System Compact ErP - 6 720 813 280 (2015/07)20
4.9 FLUE OPTIONS
4.9.1 Flue lengths
The flue systems have different maximum flue lengths
The Greenstar series has the option of two horizontal 60/100 RSF
(telescopic and longer telescopic) and one horizontal 80/125 RSF
(telescopic) flue system and two vertical RSF (60/100 or 80/125) flue
systems:
Refer to the following example Flue options for the maximum flue
lengths.
Horizontal high level flue assembly
TELESCOPIC HORIZONTAL FLUE ASSEMBLY
Extended horizontal flue
Horizontal flue with additional elbow (1 x 90 ° bend)
Horizontal flue with additional elbows (2 x 90 ° bends)
WARNING: Flue systems
▶ Onlyuse Worcester,Bosch approvedflue systems,no
other manufacturer’s flue systems have been
approved for use with Worcester appliances.
CAUTION: Non accessible flue systems:
▶ Where a flue system is not going to be accessible,
provision must be made for service and inspection.
▶ Voids containing concealed flues must have at least
one inspection hatch no less than 300mm square.
▶ Flue joints within the void must not be more than 1.5
metres from the edge of the inspection hatch.
▶ Inspection hatches should be located at changes of
direction.
▶ If this is not possible, bends should be viewable from
both directions.
NOTICE: Effective flue lengths:
▶ each 90° bend is equivalent to 2 metres of straight flue
▶ each 45° bend is equivalent to 1 metre of straight flue
Plume management kits are available for the 60/100
horizontal flue system,
Part number 7 716 191 086.
Refer to the manual supplied with the Plume
Management kits for complete installation instructions
Part number Flue Description
7 716 191 082 60/100 Telescopic horizontal flue assembly
7 716 191 171 60/100 Longer telescopic horizontal flue
assembly
7 733 600 048 60/100 Horizontal high level telescopic flue
kit
7 719 003 702 80/125 Telescopic horizontal flue assembly
7 719 002 430 60/100 Vertical flue assembly
7 719 002 431 80/125 Vertical flue assembly
Table 9 Flue kit part numbers
Flue length (mm)
60/100 80/125
Horizontal high level telescopic flue assembly 202 - 603 N/A
Table 10
6720806945-29.1Wo
383 mm - 603 mm
60/100 mm
130 mm Min
Flue length (mm)
60/100 80/125
Telescopic horizontal flue assembly 180 - 570 405 - 600
Longer telescopic horizontal flue assembly 570 - 790 N/A
Table 11
Maximum flue length
(mm)
60/100 80/125
Extended horizontal flue 6,000 15,000
Table 12
Maximum flue length
(mm)
60/100 80/125
Horizontal flue with 1 x 90° bend 4,000 13,000
Table 13
Maximum flue length
(mm)
60/100 80/125
Horizontal flue with 2 x 90° bends 2,000 11,000
Table 14
6720806945-18.1Wo
350 mm - 570 mm
60/100 mm
130 mm Min
6720806945-19.1Wo
6720806945-20.1Wo
6720806945-21.1Wo