Worcester GREENSTAR CDi CLASSIC SYSTEM User manual

UK/IE
USER INSTRUCTIONS
WALL HUNG RSF GAS FIRED CONDENSING SYSTEM BOILER
GREENSTAR CDi CLASSIC SYSTEM
6 720 812 179-00.1O
FOR CENTRAL HEATING SYSTEMS AND INDIRECT FED DOMESTIC HOT WATER
6 720 812 178 (2014/07)
The appliance is for use with:
Natural Gas or L.P.G. (CAT II 2H3P type C13 & C33)
Natural Gas:
30CDi GC number 41-406-37
35CDi GC number 41-406-39
L.P.G:
30CDi GC number 41-406-38
35CDi GC number 41-406-40

2
Preface
GREENSTAR CDi CLASSIC SYSTEM – 6 720 812 178 (2014/07)
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
regular 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 more than 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 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.
TABLE OF CONTENTS
1 Key to symbols and safety instructions . . . . . . . . . . . 3
1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 General safety instructions . . . . . . . . . . . . . . . . . . 3
2 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Operating the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2 Switching the boiler ON/OFF . . . . . . . . . . . . . . . . 6
3.3 Setting the central heating temperature . . . . . . . 7
3.3.1Controlling the central heating . . . . . . . . . . . . . . . 7
3.4 Setting the hot water temperature
(only in conjunction with optional diverter valve)
8
3.5 Frost protection
(in conjunction with optional diverter valve) . . .9
3.6 Frost protection
(without optional diverter valve) . . . . . . . . . . . .9
3.7 eco mode (only in conjunction with optional diverter
valve) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
3.8 Holiday setting (only in conjunction with optional
diverter valve) . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.9 Fault condition . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2 Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3 Extreme cold weather . . . . . . . . . . . . . . . . . . . . . 15
5 General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6 Fault or Breakdown . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7 Tips on energy saving . . . . . . . . . . . . . . . . . . . . . . . . . 17
8 Your guarantee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3
Key to symbols and safety instructions
GREENSTAR CDi CLASSIC SYSTEM – 6 720 812 178 (2014/07)
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:
•NOTE 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
1.2 GENERAL SAFETY INSTRUCTIONS
These installation instructions are intended for gas fitters,
plumbers, heating engineers and electricians.
▶ Read any installation instructions (boiler, heating controls,
etc.) carefully before starting the installation.
▶ Observe the safety instructions and warnings.
▶ Observe national and regional regulations, technical rules
and guidelines.
▶ Record all work carried out.
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.
▶ 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.
INTENDED USE
This boiler must only be used as a heat appliance in a sealed hot
water heating system for domestic purposes.
Any other use is considered inappropriate. Any damage that
results from such use is excluded from liability.
INSTALLATION, COMMISSIONING AND SERVICING
Installation, commissioning and servicing must only be carried
out by a competent, Gas Safe registered engineer.
▶ Carry out a gas tightness test after completing work on gas-
carrying components.
▶ Only use original spares.
ELECTRICAL WORK
Electrical work must only be carried out by a qualified
electrician.
▶ Before starting electrical work:
– Isolate the mains electrical supply and secure against
unintentional reconnection.
– Check for zero potential.
▶ Also observe connection diagrams of other system
components.
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 Explanation
▶ Step in an action sequence
Cross-reference to another part of the document
• List entry
– List entry (second level)
Table 1

4
General Information
GREENSTAR CDi CLASSIC SYSTEM – 6 720 812 178 (2014/07)
HANDOVER TO THE USER
When handing over, instruct the user how to operate the
heating system and inform him about its operating conditions.
▶ Explain how to operate the heating system and draw the
user's attention to any safety-relevant action.
▶ Explain that modifications and repairs must only be carried
out by an authorised contractor.
▶ Advise the user to have the system serviced annually by a
competent, Gas Safe registered engineer.
▶ Leave the installation instructions with the completed
Benchmark Checklist (or a certificate confirming
compliance with IS 813, Eire only) and the operating
instructions with the user or at the gas meter.
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.

5
Operating the boiler
GREENSTAR CDi CLASSIC SYSTEM – 6 720 812 178 (2014/07)
3 OPERATING THE BOILER
3.1 CONTROLS
Fig. 1 Control panel
[1] ON/OFF button
[2] Position for optional programmer
[3] Display
[4] System pressure gauge
[5] Reset button
[6] Eco button
(only in conjunction with optional diverter valve)
[7] Holiday button
(only in conjunction with optional diverter valve)
[8] Domestic hot water temperature control
(only in conjunction with optional diverter valve)
[9] ON/OFF and fault indicator (Blue)
[10] Central heating temperature control
[11] Central heating boost button
[12] Service button
[13] Burner indicator (Green)
1 2 43
5
6
7
13
12
11
910 86 720 812 178-01.1O

6
Operating the boiler
GREENSTAR CDi CLASSIC SYSTEM – 6 720 812 178 (2014/07)
3.2 SWITCHING THE BOILER ON/OFF
Fig. 2
Switching on
▶ Switch on the boiler by pressing the ON/OFF button.
The ON/OFF indicator light [1] shows blue.
Switching off
▶ Switch off the boiler by pressing the ON/OFF button.
The ON/OFF indicator light [1] goes out.
16 720 812 178-02.1O
The boiler runs for 15 minutes at minimum heating output to fill the condensate trap. The display [K] alternates
between and the central heating flow temperature.
This occurs every time the mains supply has been interrupted.

7
Operating the boiler
GREENSTAR CDi CLASSIC SYSTEM – 6 720 812 178 (2014/07)
3.3 SETTING THE CENTRAL HEATING TEMPERATURE
▶ Turn the central heating temperature control to the desired
level, between approximately 35°C and 90°C.
When the burner is lit, the burner indicator light [1]
underneath the ON/OFF button shows green.
Fig. 3
3.3.1 CONTROLLING THE CENTRAL HEATING
Central heating systems must be controlled effectively using a
programmer or timer and a room thermostat.
▶ For further information on how to control your central
heating systemplease refer to the individual user guides for
the programmer or timer installed in your home.
min
min
6 720 812 178-03.1O
1
Position Central heating temperature
1approx. 35 °C
2approx. 43 °C
3approx. 50 °C
4approx. 60 °C
5approx. 67 °C
6approx. 75 °C
max approx. 90 °C
Table 2 Settings for the central heating temperature

8
Operating the boiler
GREENSTAR CDi CLASSIC SYSTEM – 6 720 812 178 (2014/07)
3.4 SETTING THE HOT WATER TEMPERATURE
(ONLY IN CONJUNCTION WITH OPTIONAL DIVERTER VALVE)
Fig. 4
▶ Turn the domestic hot water temperature control [1] to the
desired level, between approximately 40°C and 60°C.
6 720 812 178-05.1O
2
3
Position Hot water temperature
min approx. 40 °C
eapprox. 50 °C
max approx. 60 °C
Table 3 Settings for the domestic hot water temperature

9
Operating the boiler
GREENSTAR CDi CLASSIC SYSTEM – 6 720 812 178 (2014/07)
3.5 FROST PROTECTION
(IN CONJUNCTION WITH OPTIONAL DIVERTER VALVE)
Activating frost protection will turn off the boiler and prevent
heating of the central heating and domestic hot water cylinder.
If the temperature within the boiler drops to 5°C the boiler will
fire to avoid the possibility of freezing.
Fig. 5
To activate frost protection:
▶ Leave ON/OFF button [1] on.
▶ Turn the central heating temperature control to .
3.6 FROST PROTECTION
(WITHOUT OPTIONAL DIVERTER VALVE)
Frost protection is only guaranteed from the external room
temperature thermostat.
If remote pipework is likely to be subject to freezing conditions:
▶ Ensure the installer has fitted a frost thermostat in the area
to protect the pipework from freezing.
▶ Ensure the installer has added a suitable anti-freeze fluid to
the water in the central heating system.
6 720 812 178-04.1O
1

10
Operating the boiler
GREENSTAR CDi CLASSIC SYSTEM – 6 720 812 178 (2014/07)
3.7 ECO MODE (ONLY IN CONJUNCTION WITH OPTIONAL DIVERTER VALVE)
Fig. 6
To deactivate eco mode:
▶ Press the eco button until it goes off.
When the eco button is not illuminated the hot water
cylinder has priority.
The hot water cylinder is first heated up and then the
appliance switches to central heating mode.
To re-activate eco mode:
▶ Press the eco button until it lights up.
When the eco button is illuminated the appliance switches
between central heating mode and cylinder charging
mode.
6 720 812 178-06.1O