Bosch Worcester Greenstar 27i System Compact User manual

UK/IE
USER INSTRUCTIONS
WALL HUNG RSF GAS FIRED CONDENSING SYSTEM BOILER
Greenstar i System Compact
6720643358-00.1Wo
FOR CENTRAL HEATING SYSTEMS AND INDIRECT MAINS FED DOMESTIC HOT WATER
6 720 807727 (2013/05)
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 41-406-13
30i System Compact 41-406-15
L.P.G. 27i System Compact 41-406-14
30i System Compact 41-406-16

2
PREFACE
Greenstar i System Compact – 6 720 807 727 (2013/05)
PREFACE
PLEASE READ THESE INSTRUCTIONS CAREFULLY
These instructions are applicable to the Worcester, Bosch Group boiler model stated on the front cover only.
These instructions apply in the UK/IE only and must be followed except for any statutory obligation.
After installation please leave this User instruction Manual, Installation, Commissioning and Servicing Instructions and completed
Benchmark Checklist with the user.
DEDICATED TO HEATING COMFORT
Thank you for purchasing a Greenstar gas-fired condensing system boiler manufactured by Worcester, Bosch Group. The company
prides itself on manufacturing boilers to the strictest quality control standards throughout every stage of production.
Worcester, Bosch group has led the field in innovative boiler design and performance for 50 years. This heritage means all our
products are of exceptional quality and proven reliability.
The Greenstar range in particular is extremely energy efficient, offering you economical running costs and value for money. It sits in
SEDBUK 2005 Band A, and is therefore amongst the top energy rated boilers available.
There is also the reassurance of our no-nonsense 2 years parts and labour guarantee - backed up by Worcester Total Cover, an
optional complete maintenance scheme to keep your boiler operating at peak condition and efficiency.

3
CONTENTS
Greenstar i System Compact – 6 720 807 727 (2013/05)
CONTENTS
1 Symbols and safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Operating the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1.1 Boiler display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1.2 Setting the boiler flow temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1.3 Boiler flow function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1.4 Setting the flow temperature for domestic hot water system . . . . . 10
3.1.5 Domestic hot water pre-heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1.6 Domestic hot water eco mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1.7 Boiler alert state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1.8 Boiler reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1.9 Turning the central heating off during the summer . . . . . . . . . . . . . . 13
3.1.10 Boiler frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.11 Turn off the Operation/fault diagnostic light (blue) . . . . . . . . . . . . . 13
4 System Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Sealed heating systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2 External filling loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5 Service Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
6 Maintaining your Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7 Fault Finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.1 Extreme cold weather . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8 Fault or Breakdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9 Environment / disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10 Tips on energy saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
11 Your guarantee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
12 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4
SYMBOLS AND SAFETY PRECAUTIONS
Greenstar i System Compact – 6 720 807 727 (2013/05)
1 SYMBOLS AND SAFETY PRECAUTIONS
1.1 EXPLANATION OF SYMBOLS
WARNING SYMBOLS
Signal words indicate the seriousness of the hazard in terms of the consequences of not following the safety instructions.
•NOTICE indicates possible damage to property or equipment, but where there is no risk of personal injury.
•CAUTION indicates possible personal injury.
•WARNING indicates possible severe personal injury.
IMPORTANT INFORMATION
ADDITIONAL SYMBOLS
Safety instructions in this document are framed and identified by a
warning triangle which is printed on a grey background.
Notes contain important information in cases where there is no risk of
personal injury or material losses and are identified by the symbol shown on the left. They are bordered by
horizontal lines above and below the text.
Symbol Meaning
1. a numbered step in an action sequence
▶ a step in an action sequence
a reference number to identify or refer to a part or item
• a list entry
– a list entry (second level)
Table 1 Symbols
1

5
SYMBOLS AND SAFETY PRECAUTIONS
Greenstar i System Compact – 6 720 807 727 (2013/05)
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.
BOILER OPERATION:
This boiler must only be operated by a responsible adult who has been instructed in, understands and is aware of the boiler's
operating conditions and effects.
COMBUSTIBLE AND CORROSIVE MATERIALS:
Chemically aggressive substances can corrode the boiler and invalidate any guarantee.
• Do not store or use any combustible materials (paper, thinners, paints, propellants, cleaning agents etc.) inside or within the
vicinity of the appliance.
FITTINGS AND MODIFICATIONS:
Only a competent engineer can remove the boiler case and carry out any work, in accordance with the Gas Safety (Installation and
Use) Regulations.
• Do not remove the boiler case.
Any misuse or unauthorised modifications to the boiler, flue or associated accessories and heating system will invalidate the
guarantee.
• Do not modify the boiler or flue system in any way.
Worcester, Bosch Group accepts no liability arising from any such actions. This does not affect your statutory rights.

6
GENERAL INFORMATION
Greenstar i System Compact – 6 720 807 727 (2013/05)
2 GENERAL INFORMATION
SERVICING
• The boiler must be serviced regularly by a competent, qualified person, such as a Worcester service engineer or other Gas Safe
registered engineer.
• Always use original spares, to help maintain the efficiency, safety and reliability of the boiler and have the Service Record
completed in the Benchmark Checklist.
The completed Benchmark Checklist will be required in the event of any guarantee work and may be required by the local Building
Control Inspector.
BENCHMARK STANDARD
The Benchmark initiative is a code of practice to encourage the correct installation, commissioning
and servicing of domestic central heating boilers and system equipment.
A “checklist” is dispatched with every boiler. This is a vital document that needs to be completed
by the installer at the time of installation. It confirms that the boiler has been installed and
commissioned according to the manufacturer's instructions.
The log book provides space for the recording of regular servicing of the boiler/heating system and this can become a valuable
document when, for example, you wish to sell the property. The log book will show a potential purchaser that the heating system
has received regular professional maintenance and servicing during its lifetime.
The Benchmark initiative aims to:
• Raise standards among professional installers
• Build and maintain high safety standards in the industry
• Improve customer satisfaction levels
• Make a contribution to the nation's commitment to climate change
Ensure that the service engineer completes the Service Record in the Benchmark Checklist after each service. The
Benchmark Checklist and service interval record can be found at the rear of the Installation, Commissioning and
Servicing Instructions.

7
CONTROLS
Greenstar i System Compact – 6 720 807 727 (2013/05)
3 CONTROLS
▶ To gain access to the boiler controls pull the flap down using the curved flap handle.
Fig. 1 Basic boiler controls
Boiler
Controls
1Service menu/back button 9 Scroll down button
2Service engineer symbol = boiler is set to maximum
or minimum output for service
10 The blue light is ON when the boiler is in an
operational mode.
It will also flash to indicate a fault.
3Eco button*
4Reset button 11 Position for optional programmer
5Boiler display 12 Hot water temperature control*
6Central heating temperature control 13 Diagnostic port**
7Scroll up button
8OK - Select/confirmation button 14 Central heating system pressure gauge
* Requires optional integral diverter kit to be functional ** for Worcester service engineer use only
6720643358-02.1Wo
1 3 65 7 8 9 10 11 12 13 1442

8
CONTROLS
Greenstar i System Compact – 6 720 807 727 (2013/05)
DISPLAY SYMBOLS
SCREEN DISPLAY BRIEF DESCRIPTION EXPLANATION
All possible screen symbols This screen is displayed briefly during boiler start
up and shows all the symbols that could be
displayed on the screen.
Numerical display Displays a temperature setting or boiler status
code.
Text display Display PreHeat or Eco, or the Alert code
Hot water Displays this symbol during a DHW demand, if the
optional integral diverter valve kit is fitted.
Central Heating Displays this symbol during central heating
demand.
Service engineer mode Displays during service when the boiler is set to
maximum or minimum output.
Alert Displays along with the boiler status code and
diagnostic code during a fault condition.
Service mode Displays when a qualified service engineer is in
the service menus.
Burner on The boiler is in operation and the flame is alight.
Centigrade indication Displays next to the temperature reading.
Confirmation This symbol confirms a manual change.
Maintenance codes A code displayed with an H and a number relates
to a maintenance issue. This is not a boiler fault
but an indication that something will need
attention concerning the boiler.
The example shown is H13 Service interval
reached, the boiler requires servicing.
Call your installer or Worcester Bosch Group to
organise a service visit.
°C
°
F
°C
°C
°F
H 13

9
CONTROLS
Greenstar i System Compact – 6 720 807 727 (2013/05)
3.1 OPERATING THE BOILER
3.1.1 BOILER DISPLAY
This is typical of the display when the boiler is not supplying a heat demand.
The display will not be backlit and the internal temperature of the boiler is indicated.
3.1.2 SETTING THE BOILER FLOW TEMPERATURE
1. Turn the central heating temperature control knob to the desired flow temperature between
30 and 82°C, this will be indicated on the digital display. This is not the room temperature but the flow temperature through the
radiators.
The “e” point provides guidance for the maximum temperature setting for optimum energy efficiency.
2. The radiator symbol will be displayed to confirm that the heating mode is being adjusted.
3. The value is displayed during this process, after five seconds the boiler display will return to the default screen.
Fig. 2 Central heating temperature control
▶ Comfort levels within rooms should be controlled by your thermostatic radiator valves and/or room thermostat.
max
min
2
3
1
04
bar
1
ok
eco
reset
e
max
min
°C
°F
°C
°F
6720807727-01.1Wo
max
min
2
3
1
04
bar
1
ok
eco
reset
e
max
min
°C
°F
Eco
1.
6720643358-03.1Wo
°C
°F
Eco
2.
3.

10
CONTROLS
Greenstar i System Compact – 6 720 807 727 (2013/05)
3.1.3 BOILER FLOW FUNCTION
If a heat demand occurs, the radiator and flame symbols will be displayed
If the domestic hot water control is adjusted or the “eco” button is pressed:
▶ N/A is displayed briefly.
▶ If the optional integral diverter valve is fitted, PreHeat or Eco will be displayed.
Fig. 3
3.1.4 SETTING THE FLOW TEMPERATURE FOR DOMESTIC HOT WATER SYSTEM
1. Turn the hot water temperature control knob to the desired level between 40 and 70°C, this will be shown on the digital display.
Fig. 4 Hot water temperature
▶ The tap symbol will be displayed to confirm that the hot water is being adjusted.
▶ After five seconds the boiler display will return to the default screen.
An internal or external timer/programmer coupled with the optional integral diverter valve kit with cylinder
temperature sensor is required to be able to set the hot water temperature.
If an FR110 or FW100 controller is also fitted, in conjunction with the diverter valve, they assume control over the
delivered temperatures, reducing the effect of the temperature controls. Set both to maximum.
An external timer may be fitted instead of an internal timer.
max
min
2
3
1
04
bar
1
ok
eco
reset
e
max
min
°C
°F
6720807727-05.1Wo
°C
°F
max
min
2
3
1
04
bar
1
ok
eco
reset
e
max
min
°C
°F
°C
°F
1.
6720807727-03.1Wo