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GREENSTAR CDi
WALL HUNG RSF GAS-FIRED CONDENSING
COMBINATION BOILER
FOR SEALED CENTRAL HEATING SYSTEMS AND MAINS FED
DOMESTIC HOT WATER
THE APPLIANCE IS FOR USE
WITH NATURAL GAS OR L.P.G.
(Cat II 2H3P TYPE C13 & C33)
25CDi GC-Number 47-311-92
30CDi GC-Number 47-311-93
35CDi GC-Number 47-311-94
40CDi GC-Number 47-311-95
USER INSTRUCTIONS &
CUSTOMER CARE GUIDE
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CONTACT INFORMATION
WORCESTER BOSCH:
TECHNICAL: 08705 266241
SERVICE: 08457 256206
SPARES: 01905 752571
LITERATURE: 01905 752556
TRAINING: 01905 752526
SALES: 01905 752640
WEBSITE:
www.worcester-bosch.co.uk
WATER TREATMENT:
FERNOX 01799 550811
www.fernox.com
SENTINEL 0151 420 9595
www.betzdearborn.com/sentinel
FLUE TERMINAL GUARDS:
TOWER FLUE COMPONENTS
Vale Rise, Tonbridge TN9 1TB
USER INSTRUCTIONS & CUSTOMER
CARE GUIDE
PLEASE READ THESE INSTRUCTIONS
CAREFULLY BEFORE OPERATING YOUR
APPLIANCE
THESE INSTRUCTIONS ARE APPLICABLE TO
THE WORCESTER BOSCH 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.
THE INSTRUCTIONS APPLY IN THE UK ONLY
AND SHOULD BE FOLLOWED EXCEPT FOR
ANY STATUTORY OBLIGATION.
IF YOU ARE IN ANY DOUBT CONTACT THE
WORCESTER BOSCH TECHNICAL HELPLINE.
DISTANCE LEARNING AND TRAINING COURSES ARE AVAILABLE FROM WORCESTER
BOSCH.
THIS APPLIANCE MUST BE INSTALLED BY A
COMPETENT PERSON. FAILURE TO INSTALL
CORRECTLY COULD LEAD TO
PROSECUTION.
PLEASE LEAVE THIS GUIDE, THE INSTALLATION INSTRUCTIONS AND THE COMPLETED
BENCHMARK LOG BOOK WITH THE USER OR
AT THE GAS METER AFTER INSTALLATION.
ABBREVIATIONS USED IN THIS BOOK:
NG - Natural Gas
LPG - Liquid Petroleum Gas
CH - Central Heating
SEDBUK - Seasonal Efficiency of Domestic
Boilers in the United Kingdom
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USER INSTRUCTIONS &
CUSTOMER CARE GUIDE
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CONTENTS
INTRODUCTION
EXCELLENCE COMES AS STANDARD 4
SAFETY PRECAUTIONS 5-7
GENERAL NOTES 8-11
USING YOUR APPLIANCE
CONTROLS 12
OPERATING THE APPLIANCE 13-15
Switching the appliance on/off 13
Setting the central heating temperature 13
Controlling central heating 13
Frost protection 14
Controlling domestic hot water 14-15
Fault condition 15
ENERGY SAVING
TIPS ON ENERGY SAVING 16-17
MAINTENANCE
MAINTAINING YOUR APPLIANCE 18
FAULT FINDING 19
FAULT OR BREAKDOWN 20-21
GUARANTEE
YOUR GUARANTEE 22
GUARANTEE REGISTRATION 23
USING YOUR
ENER GY
INTRODUCTION
APPLIANCE
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MAINTENANC E
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CONTENTS
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Page 4
EXCELLENCE COMES AS
STANDARD
INTRODUCTI ON
Thank you for purchasing a Greenstar
25CDi/30CDi/35CDi/40CDi gas-fired
condensing combination boiler manufactured by Worcester Bosch. The company prides itself on manufacturing boilers to the strictest quality control standards throughout every stage of production. Worcester Bosch has led the field
in innovative appliance design and performance for more than 40 years. This
heritage means all products are of
exceptional quality and proven reliability.
The Greenstar range in particular is
extremely energy efficient, converting up
to 97% of gas consumed into heat, offering you economical running costs and
value for money. It sits in SEDBUK
Band A, and is therefore amongst the
top energy rated appliances available.
There is also the reassurance of our nononsense 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.
To find out more about Worcester
Bosch log onto www.worcesterbosch.co.uk.
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EXCELLENCE COMES
AS STANDARD
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SAFETY PRECAUTIONS
IF YOU SMELL GAS:
6 DON’T SMOKE OR STRIKE
MATCHES
6 DON’T TURN ELECTRICAL
SWITCHES ON OR OFF
4 DO PUT OUT NAKED FLAMES
4 DO OPEN DOORS AND
WINDOWS
4 DO KEEP PEOPLE AWAY FROM
THE AREA AFFECTED
4 DO TURN OFF THE CONTROL
VALVE AT THE METER
4 TELEPHONE YOUR GAS
COMPANY
BENCHMARK STANDARD
INTRODUCTI ON
‘Benchmark’ is a code of practice for
correctly installing, commissioning and
servicing of domestic water heating
appliances.
A Benchmark Checklist is provided by
the manufacturer for the installer to
complete ALL details together with their
CORGI registration number and sign to
confirm that the boiler has been installed and commissioned according to the
manufacturer’s instructions.
IMPORTANT: The completed
Benchmark Checklist will be required in
the event of any warranty work and may
be required by the local Building
Control Inspector.
HEALTH & SAFETY
The appliance contains no asbestos and
no substances used in the construction
process that contravene the COSHH
Regulations (Control of Substances
Hazardous to Health Regulations 1988).
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SAFETY
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SAFETY PRECAUTIONS
COMBUSTIBLE AND CORROSIVE
INTRODUCTION
MATERIALS
Do not store or use any combustible
materials (paper, thinners, paints etc.)
inside or within the vicinity of the appliance.
Chemically aggressive substances, such
as halogenated hydrocarbons containing
chlorine or fluorine compounds can corrode the appliance and invalidate any
warranty.
FITTING & MODIFICATIONS
Fitting the appliance, any controls to the
appliance and removal of the outer
casing may only be carried out by a
competent engineer in accordance with
the Gas Safety (Installation and Use)
Regulations.
Flue systems must not be modified in
any way other than as described in the
Installation Instructions and 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.
This does not affect your statutory rights.
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SAFETY
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SAFETY PRECAUTIONS
SERVICING
The user is recommended to have the
system regularly serviced by a competent, qualified engineer (such as British
Gas or CORGI registered personnel)
using original spares, to help maintain
the economy, safety and reliability of the
appliance and to have the Service
Record completed in the Benchmark
Checklist.
The appliance should be serviced annually after installation unless the particular
installation conditions and usage
demand more frequent services.
IMPORTANT - ensure that the service
engineer completes the Service Record
in the Benchmark Checklist after each
service.
INTRODUCTION
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SAFETY
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GENERAL NOTES
To get the best from your appliance plea-
INTRODUCTION
se read these instructions carefully.
SEALED HEATING SYSTEMS
This appliance is fitted to a sealed heating system which is pre-pressurised.
Your installer will advise you of the minimum and maximum pressure which
should be indicated on the pressure
gauge.
Check regularly that the pressure is
maintained and contact your installer or
maintenance engineer if a permanent
significant drop in pressure is indicated
on the pressure gauge. If the system
loses pressure it should be re-pressurised and the cause of the fall investigated.
CENTRAL HEATING SYSTEMS
During the first few hours of operation of
the central heating system, check that all
radiators are being heated at an even
rate. If the top of a radiator is at a lower
temperature than the bottom then it
should be vented by releasing air
through the venting screw at the top of
the radiator. Ask your installer to show
you how this is done.
This boiler is fitted to a sealed system;
repeated venting will reduce the quantity
of water in the system and this must be
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GEN ERAL NOTES
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mm
mm
+ 30mm
above elbow
5mm
5mm
600mm
200mm
*600mm
(**20mm)
GENERAL NOTES
replenished for safe and satisfactory
operation of the appliance.
Should water leaks be found in the
system or if excessive venting is required, then a service engineer must be
contacted to inspect the installation and
rectify any fault.
Only additives that are compatible with
aluminium may be used in the system.
Any incompatible additive used will invalidate the guarantee.
CONDENSATE DRAIN
This is a condensing appliance and the
terminal will, at times give out a plume of
water vapour. This is quite normal.
The appliance also produces quantities
of condensate which is discharged regularly by a siphon within the boiler via a
pipe to drain. This pipe must not be
blocked or altered in any way.
CLEARANCES - VENTILATED
COMPARTMENT
Your installer will have provided adequate space around the appliance for safety
and servicing access. Do not restrict this
space with the addition of cupboards,
shelves etc. next to the appliance.
*600 mm service clearance required to a
fixed surface
(**20 mm from removable door or panel)
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GENERAL NOTES
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+ 250mm
above elbow
100mm*
100mm*
300mm
100mm**
to removable door
600mm***
front clearance
for service
+ 30mm
above elbow
200mm*
200
mm*
100mm**
600
mm***
200mm
A
INTRODUCTION
B
10
GEN ERAL NOTES
GENERAL NOTES
BOILER CLEARANCES UNVENTILATED COMPARTMENT
The diagrams (A and B) opposite show
two options for the minimum space
required to install and service the boiler
inside an unventilated compartment.
* This space can be reduced to 50 mm
for one side only as long as both the
side clearances add up to the total of
both the side measurements shown or
more.
** Space required for unventilated areas
with a removable door or panel.
*** 600 mm clearance required to a fixed
surface for servicing.
ROOM THERMOSTAT
A room temperature controller and programmer should be fitted to control the
central heating. Refer to the instructions
supplied with the thermostat for information on siting and setting.
THERMOSTATIC RADIATOR VALVES
It is recommended that this type of valve
is fitted to all but one of the radiators (or
at least those in the sleeping accommodation). The remaining radiator, which
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must be where the room thermostat is
located, should be uncontrolled and
must be left open. The thermostatic
radiator valves should conform to the
requirements of BS2767:10.
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GENERAL NOTES
VENTILATION
This is a room sealed appliance and
does not require any air for combustion
from inside the property. If the appliance
is fitted into a cupboard or a compartment is built around the appliance after
installation, then the compartment must
be separated from the boiler space by a
perforated non-combustible partition as
described in BS 6798.
Notwithstanding the requirements of BS
6798 and BS 5440 there is no need for
ventilation openings to be provided in
the compartment because of the low
heat loss from the appliance casing, if
the clearances shown are maintained.
Do not operate the appliance if the flue
terminal fitted on the outside wall or roof
is obstructed or damaged.
PUMP ANTI-SEIZURE
If there has been no heating demand for
24 hours the boiler will run the system
pump for a few seconds to reduce the
possibility of pump seizure during long
periods of inactivity, which is usually
more frequent during the summer
months.
INTRODUCTION
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GENERAL NOTES
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A
D
F
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B
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CONTROLS
APPLIANCE
USING YOUR
A - MASTER SWITCH FOR ON/OFF
B - MAINS ON/OFF INDICATOR +
FAULT DIAGNOSTICLIGHT
C - CENTRAL HEATING TEMPERA-
TURE CONTROL
D - BURNER ON INDICATOR LIGHT
(GREEN)
E - FAULT RESET BUTTON
F - SERVICE BUTTON
G - DOMESTIC HOT WATER TEMPE-
RATURE CONTROL
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CONTROLS
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H - ECO BUTTON (DOMESTIC HOT
WATER PRE-HEAT ON/OFF)
I - SYSTEM PRESSURE GAUGE
J - POSITION FOR OPTIONAL
PROGRAMMER
K - DISPLAY
L - CENTRAL HEATING BOOST
BUTTON
M - HOLIDAY BUTTON
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OPERATING THE APPLIANCE
SWITCHING THE APPLIANCE ON/OFF
Switching on
B Switch on the appliance by pressing
the master switch.
The indicator light shows blue
• The boiler runs for 15 minutes at minimum heating output to fill the condensate trap, the display (K) alternates between “-II-” and the central heating flow
temperature. This occurs every time the
mains supply has been interrupted.
Switching off
B Switch off the appliance by pressing
the master switch.
The blue indicator light goes out.
SETTING THE CENTRAL HEATING
TEMPERATURE
B Turn the central heating temperature
control to the desired level, between
40 °C and 90 °C.
B When the burner is lit, the green indicator light underneath the on/off switch
is illuminated.
CONTROLLING CENTRAL HEATING
B Set the timer to the correct time.
B Set room thermostat to the desired
room temperature.
B Set the thermostatic radiator valves to
the desired settings.
OPERATING THE
APPLIANCE
13
APPLIANCE
USING YOUR
Page 14
OPERATING THE APPLIANCE
FROST PROTECTION
B Leave master switch on.
B Turn the central heating temperature
control to .
APPLIANCE
USING YOUR
If the temperature falls to 5 °C within the
boiler it will fire to avoid the possibility of
freezing.
B Add a suitable anti-freeze fluid to the
water in the central heating system.
B If remote pipework is likely to be subjected to freezing conditions, ensure the
installer has fitted a frost thermostat in
the area to protect the pipework.
CONTROLLING THE HOT WATER
TEMPERATURE
B The hot water temperature can be set
to between approx. 40 °C and 60 °C
using the temperature control .
DOMESTIC HOT WATER PRE-HEAT
Pre-heat reduces the time taken to produce hot water at the tap and is controlled by the ECO button.
B Press the ECO button to select either:
When the ECO button
the boiler will be in pre-heat mode
ted
is not illumina-
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OPERATING THE
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OPERATING THE APPLIANCE
(which will reduce the time taken to produce hot water at the tap).
OR
When the ECO button is illuminated
the boiler will be in ECO mode with no
pre-heat available.
FAULT CONDITION
In the unlikely event of a fault occurring
while the appliance is in operation:
The reset button will flash once per
second and the mains indicator (blue
light) will flash also. The display shows a
fault code.
B To reset boiler press the reset button.
The reset button will no longer be illuminated and the mains indicator will stop
flashing.
The boiler will function normally, dependent on programmer and room thermostat settings.
If the fault remains and cannot be cleared by pressing the reset button, or if
fault persists contact Worcester Bosch
for assistance, giving a description of the
fault and, if possible, the fault code from
the display.
APPLIANCE
USING YOUR
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OPERATING THE
APPLIANCE
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TIPS ON ENERGY SAVING
Heating economically
The boiler is designed to provide a high
level of comfort while keeping gas consumption and the resulting environmental effect as low as possible. The gas
supply to the burner is controlled according to the level of demand for heat.
The boiler continues to operate with a
low flame if the demand for heat reduces. The technical term for this process
is modulating control. Modulating con-
SAVING
ENERGY
trol reduces temperature fluctuations
and provides even distribution of heat
throughout the home. This means that
the boiler may stay on for relatively long
periods but will use less gas than an
appliance that continually switches on
and off.
Central heating systems with room
thermostats/thermostatic radiator
valves
The central heating control on the boiler
should be set to the maximum rated temperature of the central heating system.
The temperature of each room can be
set individually (except primary room with
the room thermostat) using the thermostatic radiator valves.
Roof insulation
Around 30% of the heat loss from a property is through the roof. Replace any
old insulation with new insulation, preferably of around 200 mm thickness or
more.
Window frames
Single glazed windows, particularly
those with steel frames, can lose a great
deal of heat. Consideration should be
given to replacement with PVCu or wooden framed double glazed units.
Curtains
Lined curtains, or heavier full length curtains can provide excellent insulation.
However, always ensure that the curtains
do not drape over radiators.
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TIPS ON ENERGY
SAVING
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TIPS ON ENERGY SAVING
Draughts
Try to ensure that draughts around
doors, windows, letterboxes and keyholes etc. are reduced by using a suitable
draught excluder. Warning - Do not block
or seal any air vents that are installed to
ensure the central heating boiler operates safely.
Room thermostats
Reducing the setting of the room thermostat by 1 °C can reduce fuel consumption by up to 10%.
New control systems
Upgrade your heating control system if
necessary with the latest equipment
available. The minimum level of control is
a programmer, interlocking room thermostat and thermostatic radiator valves.
Radiators
More often than not radiators will be
sited underneath a window, so the warm
air from the radiator heats the colder
incoming air from the window. The performance of the radiator will be affected
if the curtains are allowed to drape over
the radiator or shelves are fitted above it.
The positioning of furniture and tables in
front of the radiator should also be avoided.
It is advisable to manually adjust all
radiator thermostatic valves every 2-3
months to prevent them sticking. It is
also important that the plastic tops of all
valves are always in position and not
cracked or damaged to prevent accidents. Care should be taken when vacuum cleaning carpets to avoid damage to
valves and pipework.
The heating system and the outputs of
the radiators have been carefully selected by your installer. The temperature
obtainable in any given room is dependent on all radiators being operated at
the same time. If you decide to turn off
radiators in unused rooms, spare
bedrooms etc., you may experience
slightly lower room temperatures in
rooms adjacent to unheated rooms.
AVING
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TIPS ON ENERGY
SAVING
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MAINTAINING YOUR
APPLIANCE
Your new Greenstar 25CDi/30CDi/
35CDi/40CDi gas-fired appliance represents a long term investment in a reliable, high quality product.
In order to realise its maximum working
life, and to ensure it continues to operate at peak efficiency and performance, it
is essential that your boiler receives
regular servicing and maintenance
checks from a competent person
beyond the initial 2 year guarantee
period.
If you would like to know more about a
Worcester Bosch service contract, please tick the appropriate box on your war-
MAINTENANC E
ranty registration card.
If your Greenstar 25CDi/30CDi/
35CDi/40CDi should fail to operate correctly or requires servicing please contact the Worcester Bosch Service
Department (see inside front cover for
details).
Details of the boiler including the Gas
Council number can be found under the
controls cover flap on the boiler.
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MAINTAINING
YOUR APPLIANCE
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FAULT FINDING
This table gives information on basic
operating system problems.
In the unlikely event of a boiler fault
please read the following page thoroughly before contacting Worcester
Bosch.
Problem Cause Remedy
Desired room temperature
is not reached
Desired room temperature
exceeded by large amount
Heating stays on for too
long
No on/off indicator Momentary power failure Switch off appliance at
Hot water temperature too
low
Hot water temperature too
high
Thermostatic radiator
valve(s) set too low
Temperature control for CH
flow on boiler set too low
Air trapped in heating
system
Increase thermostatic
radiator valve setting(s)
Increase CH flow temperature control setting
Bleed radiators and recharge heating system
Radiators are too hot Turn down thermostatic
radiator valves / room thermostat
Reduce central heating
temperature on boiler
Clock is incorrectly set Check setting
master switch, wait a few
seconds then switch on
again
Temperature set too low
Programmer setting
Water flow at tap too high
Check setting
Check setting
Reduce flow rate at tap
Temperature set too high Check setting
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FAULT FINDING
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FAULT OR BREAKDOWN
This appliance is supported in the UK
by Worcester, Bosch Group.
Specialist factory trained Service
Engineers are available to attend a
breakdown occurring on this appliance.
No charge will be made for parts
and/or labour providing:
B An appliance fault is found and the
appliance has been installed within the
past 24 months. Reasonable evidence
of this must be supplied on request. i.e.
the Benchmark Checklist.
A call-out charge will be made where:
MAINTENANC E
B The appliance has been installed for
over 24 months.
OR
B Evidence cannot be provided that the
first year service inspection has been
carried out (ie. an entry in the
Benchmark Checklist).
OR
B Our Field Service Engineer finds no
fault with the appliance (see Note).
OR
B The cause of breakdown is misuse or
with other parts of your plumbing/heating system, or with equipment not supplied by Worcester Bosch.
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FAULT OR
BREAKDOWN
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FAULT OR BREAKDOWN
Note:
NO APPLIANCE FAULT IS FOUND ON
OVER 30% OF ALL SERVICE CALL
OUTS.
Please read this guide carefully to gain a
good understanding of the operation of
your appliance. In the case of a suspected fault, refer to the fault finding section
of this guide.
If in doubt contact our Technical
Helpline
In the event of an appliance fault or
breakdown please contact our Service
Department. Your service administrator
will arrange for an engineer to call with
the minimum of delay; under normal circumstances this will be from 1 - 3 working days (excluding weekends) for priority breakdown situations (no hot water
and/or heating).
Invoices for attendance and repair work
carried out on this appliance by any third
party will not be accepted.
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FAULT OR
BREAKDOWN
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YOUR GUARANTEE
This appliance is guaranteed against
faulty material or workmanship for a
period of 2 years from the date of installation subject to the following terms and
conditions.
B Your Guarantee Registration Card
must be returned within 30 days for the
second year of your guarantee to become valid.
B During the period of this guarantee
any components of the unit which are
proven to be faulty or defective in manufacture will be exchanged or repaired
free of charge by BBT
Thermotechnology UK Ltd.
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B The householder may be asked to
prove the date of installation, that the
appliance was correctly commissioned
and, where appropriate, the first year’s
service has been carried out to the satisfaction of BBT Thermotechnology UK
Ltd. when requested. These should be
part of the Benchmark Checklist.
B Any product or part returned for servicing under the guarantee must be
accompanied by a claim stating the
model, serial number & date of installation.
B BBT Thermotechnology UK Ltd. will
not accept responsibility for damage
caused by faulty installation, neglect,
misuse or accidental damage or the nonobservance of the instructions contained
in the Installation and Servicing Manual
and User Instructions.
B The appliance has been used only for
the normal domestic purposes for which
it was designed.
B This guarantee applies only to equipment purchased and used in the United
Kingdom.
This guarantee does not affect your statutory rights.
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YOUR
GUARANTEE
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Model
GUARANTEE REGISTRATION
You should complete and return the
postpaid Guarantee Registration Card
within 14 days of purchase.
Returning the card will register you as
the owner of your new Greenstar
25CDi/30CDi/35CDi/40CDi appliance
and will assist us in maintaining an
effective and efficient customer service
by establishing a reference and permanent record for your boiler.
This does not affect your statutory
rights.
For your own record:
Serial No.
(See guarantee card)
Type / size
Date of installation
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Check that the Benchmark Checklist
has been completed by your installer or
service engineer.
GUARANTEE
REGISTRATION
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USER INSTRUCTIONS &
CUSTOMER CARE GUIDE
Worcester, Bosch Group
Cotswold Way, Warndon, Worcester WR4 9SW.
Tel. 01905 754624 Fax. 01905 754619
www.worcester-bosch.co.uk
Worcester Bosch Group is a trading name of
BBT Thermotechnology UK Ltd.
6 720 611 928a (02/05) OSW
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