Worcester Greenstar 12Ri Manual

Technical and Specification Information Greenstar CDi Classic
Regular Series
Greenstar Ri Series
Technical and Specification Information
Greenstar CDi Classic
Regular Series
Greenstar Ri Series
Greenstar regular gas-fired condensing
wall mounted boiler range

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Worcester and you. Making a difference.
As part of the Bosch Group, Worcester
products are designed and manufactured to
provide customers with the highest levels of
quality and reliability which are synonymous
with the Bosch name throughout the world.
As part of Europe’s largest supplier of
heating products, Worcester, Bosch Group
has the UK-based resources and support
capability to offer you the value-added
solutions you deserve. Worcester employs
a nationwide network of Service Engineers
and technically trained Field Sales Managers
supported by an experienced technical
services team which is able to provide
comprehensive support and advice
from designing system layouts through
to installation.
Worcester is dedicated to providing energy
efficient gas- and oil-fired condensing
boilers, as well as an extensive range of
renewable technologies. All of our products
have been developed and introduced with
the aim of helping the UK to achieve the
Government’s efficiency targets.

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“At Worcester we recognise the vital role you
play in the specification and installation of
energy efficient appliances in homes across
the UK. We will continue to invest in our
products, people, facilities and added value
services to ensure you have all you require
in order to deliver only the best solutions to
your customers’ requirements.”
Carl Arntzen,
Managing Director,
Bosch Thermotechnology Ltd.
Contents Page
The Greenstar condensing regular boiler range 4 - 5
Features of the Greenstar condensing regular
boiler range 6 - 7
Inside story – Greenstar Ri 8
Greenstar Ri regular technical data 9
Inside story – Greenstar CDi Classic Regular 10
Greenstar CDi Classic Regular technical data 11
Site preparations and guidance 12 - 15
Condensate pipework 16 - 17
The Worcester CondenseSure auxiliary siphon 18 - 19
Installation requirements 20 - 22
The Worcester Greenstar System Filter 23
Horizontal and vertical flue terminal positioning 24 - 25
Greenstar regular boiler range
horizontal fluing options 26 - 28
Greenstar regular boiler range
vertical fluing options 29 - 30
Plume management system options 31 - 35
Greenstar regular boiler range accessories 36 - 37
Greenfloor heating 38
Worcester training 39 - 41
After-sales 42
The reception and main entrance
at our Worcester headquarters

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The Greenstar condensing
regular boiler range
The Greenstar regular range is part of a market leading
range of energy-saving condensing wall mounted
gas-fired boilers.
Floor standing regular boilers are also available from
Worcester in 30kW and 40kW outputs. For further
information see the FS CDi Regular Tech & Spec,
part no. 8 716 115 422.
Higher efficiency therefore highly cost effective
The Greenstar condensing regular boilers have an annual
efficiency (SEDBUK value) of over 90%, efficiently
producing heat for your heating and/or hot water system.
Non-condensing boilers achieve around 78% efficiency.
Therefore, compared with a non-condensing boiler,
Greenstar condensing regular boilers can cut heating and
hot water bills and are cheaper to run than an older boiler.
Hence, SEDBUK Band A ratings for all models in the
Greenstar condensing range.
Greenstar condensing regular boilers deliver this energy-
saving performance by recycling exhaust gases to extract
and re-use the latent heat – a highly efficient use of energy
which also significantly reduces carbon dioxide emissions
into the atmosphere.
To all these major benefits you can add yet more: renowned
Worcester quality and reliability; a range of outputs to
satisfy the heating demands of a range of households and
truly all-round value for money.
Greenstar 12Ri low NOx model
Worcester’s commitment to reduce emissions from gas-
fired condensing boilers now sees the 12Ri model achieve
NOx values <40mg/kWh. This enables the appliance to
achieve 3 credits under The Code for Sustainable Homes
whilst still achieving a SEDBUK A rating.

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The Greenstar regular range at a glance
12Ri 15Ri 18Ri 24Ri 30CDi Classic
Regular
40CDi Classic
Regular
Output kW to
central heating (CH)
Min 4kW 5kW 6kW 8kW 7.7kW 9.4kW
Max 12kW 15kW 18kW 24kW 30kW 40.8kW
Primary temperature control 
Modulating control 
Natural gas 
LPG boiler 
Electronic ignition 

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Features of the Greenstar condensing
regular boiler range
A condensing boiler is more efficient due to its ability to
extract more heat from the flue gases normally lost to the
environment through the flue system.
As the flue gases pass through the heat exchanger this
extra surface area can cool the flue gases to around 55°C
whereupon the latent heat within, which would normally be
lost to the atmosphere, is instead released and applied to
the system.
It is this ability to extract as much heat as possible from
the gas it burns that gives the Greenstar condensing regular
range an exceptionally high level of operating efficiency.
This higher efficiency is recognised within Section L of the
Building Regulations, subsequently achieving a higher SAP
or NHER rating.
Whenever a demand for DHW or CH is made, the boiler’s
electronic control system is energised and the burner
electronically ignites via a flame ionisation system.
The pre-mix burner automatically adjusts to the set level.
The flow temperature of the boiler is then maintained at the
customer setting by the fascia mounted variable control.
Should the system requirements reduce during operation
(TRVs closing down, etc.) and the flow temperature
exceed the customer setting then the burner will modulate
downwards to match the system demand level. Should the
flow temperature continue to rise then the burner will be
de-energised and the control system will go into an
anti-cycle mode and not allow the appliance to re-fire for
a set period.
Fluing options
The Greenstar regular range features 2 different sizes of
multi-directional RSF flue systems, 100mm or 125mm. The
flue can be run horizontally or vertically with additional 90º
or 45º in-line bends allowing changes of route or direction,
providing an extremely flexible and versatile fluing system
enabling the appliance to be sited virtually anywhere. More
details are shown on pages 26-30.
Greenstar Ri security features
• Security coding
• Non-removable wall screws.
Gas options
Greenstar regular boilers are manufactured in both natural
gas and Liquid Petroleum Gas (LPG) variants.
Greenstar CDi Classic Regular and Ri boilers
The Greenstar regular boilers are designed for connection
to a fully pumped heating and hot water system e.g. Y or
S plan. For this reason no plug-in controls are available
on Greenstar regular models. The advice of a controls
manufacturer should be sought.
• The Greenstar regular boilers are suitable for a wide range
of heating loads allowing extension to the heating system
without upgrading the boiler
• The Greenstar regular boilers are capable of operating on
both open vent and sealed primary water systems*
• Two or more Greenstar regular boilers can be linked
together to cater for commercial or industrial applications.
*Sealed systems require additional external components: expansion vessel and PRV (not supplied by Worcester)

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*Where required – see installation booklet for further details. **Subject to terms and conditions.
1. Power ON/OFF switch
2. Burner ‘ON’ indicator LED
3. Service mode button
(Greenstar CDi Classic Regular only)
4. Inspection and advanced service mode button
(Greenstar CDi Classic Regular only)
5. Central heating temperature control selector
6. Mains ‘ON/OFF’ indicator with diagnostic sequence
7. Digital display (Greenstar CDi Classic Regular only)
8. Boiler reset button
9. ‘Eco’ mode (not operational on these boilers)
10. Holiday mode button
(Greenstar CDi Classic Regular only)
System controls
The Building Regulations Section L 2006 require a minimum
level of controls to be installed on all heating systems, both
on new build and refurbishment.
Generally, this would require:
• Room thermostat
• TRVs on all radiators, or at least those radiators in
sleeping areas if not already fitted. Do not fit TRVs in
the room in which the room thermostat is installed
• Time and temperature control for central heating and
domestic hot water
• Automatic by-pass.*
Further information is available in the Domestic Heating
Compliance Code.
Energy-saving & environmental features
• SEDBUK A Rated
• Low electrical consumption when the boiler is in
standby mode
• Aluminium-silicon heat exchanger delivers high efficiency
and reliability
• Electronic ignition
• Anti-cycle control
• Modulation control gives efficient use of energy
Time & labour-saving installation features
• All models available as natural gas and LPG
• Full range of Condensfit II™ flue options in both
60/100mm and 80/125mm diameters. 60/100mm includes
plume deflector as standard and plume management kit
available as an option
• Flow and return pipes supplied to allow pipes behind
installation
• Greenstar Ri weighs just 22.6kg making it the lightest
boiler in its class
End user comfort and convenience features
• 10 year guarantee on Worcester primary heat exchanger**
• Boiler protection plans available for both new and out of
warranty Worcester boilers
• Bosch renowned quality and reliability
• Built-in frost protection
• Optional anti-theft security fittings (Greenstar Ri only)
• Controls behind flap – aesthetically pleasing and
discourages children altering controls
(Greenstar CDi Classic Regular only)
• Compact dimensions of Greenstar Ri range make it ideal
for kitchen cabinet installation
Greenstar CDi Classic Regular fascia
1
2
3
4
56
7
8
9
10
Fascia features and control options
Greenstar Ri regular fascia
1 5
6
28

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Inside story – Greenstar Ri
condensing regular boiler series
Fan pressure
test point
Air/gas manifold
Fan
Air/gas
adjustment screw
Gas valve
Inlet pressure
test point
Boiler power switch
Syphonic trap
Power and fault
indicator (blue)
Flame indicator
(green)
Cover for external
wiring connections
Flow connection
22mm compression
Drain point
Boiler thermostat
and reset knob
Return connection
22mm compression
Service access point
Flue overheat
thermostat
WB3 heat exchanger
Manual vent point
Sensor boiler flow
Over-heat thermostat
Silicon tube (use to vent
air from heat exchanger)
Removable top
case for cleaning
heat exchanger

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Technical data
Model Greenstar 12Ri Greenstar 15Ri Greenstar 18Ri Greenstar 24Ri
Height (mm) 600 600 600 600
Width (mm) 390 390 390 390
Depth (mm) 270 270 270 270
Weight – dry (kg) 22.6 22.6 22.6 22.6
2005 SEDBUK value – natural gas 90.1% / A rated 90.1% / A rated 90.1% / A rated 90.2% / A rated
2005 SEDBUK value – LPG 91.4% / A rated 91.4% / A rated 91.4% / A rated 92.0% / A rated
2009 SEDBUK value – natural gas 88.8% 88.8% 88.8% 89.2%
2009 SEDBUK value – LPG 89.8% 89.8% 89.8% 90.2%
Heating flow / return connections 22mm compression 22mm compression 22mm compression 22mm compression
Gas connection 22mm compression 22mm compression 22mm compression 22mm compression
Primary water content (litres) 1.1 1.1 1.1 1.1
Max. flow temperature (ºC) 82 82 82 82
Output to central heating
kW 4 - 12 5 - 15 6 - 18 8 - 24
(Btu/h) (13,648 - 40,944) (17,060 - 51,180) (20,472 - 61,416) (27,296 - 82,000)
Max. vertical flue (mm) (100mm dia.)
inc. terminal 6,400 6,400 6,400 6,400
Max. vertical flue (mm) (125mm dia.)
inc. terminal 15,000 15,000 15,000 15,000
Max. horizontal flue (mm) (100mm dia.) 4,600 4,600 4,600 4,600
Max. horizontal flue (mm) (125mm dia.) 13,000 13,000 13,000 13,000
NOx classification (mg/kWh) 39 60 84 66
NOx class 5545
Noise output level (dB(A)) 39 42.7 43.7 41

Inside story – Greenstar CDi Classic
Regular condensing boiler series
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Auto air vent
Air/gas
adjustment screw
Condensate syphon
Gas valve
Down firing
low NOx burner
Aluminium/
silicon WB5
heat exchanger
Pre-mix fan
Drain point
Digital displayOn/off
button
Central heating
temperature control