Bosch Worcester Greenstar 24i junior User manual

Greenstar 24i jjuunniioorr/ 28i jjuunniioorr
WALL HUNG GAS-FIRED CONDENSING COMBINATION BOILER
FOR SEALED CENTRAL HEATING SYSTEMS & DOMESTIC HOT WATER
USER INSTRUCTIONS &
CUSTOMER CARE GUIDE
THIS BOILER IS USED WITH
NATURAL GAS OR LPG (Cat II 2H3P TYPE C13, C33 & C53)
NATURAL GAS 24i junior GC NUMBER: 47 311 86
28i junior GC NUMBER: 47 311 87
LIQUID PETROLEUM GAS 24i junior GC NUMBER: 47 311 90
28i junior GC NUMBER: 47 311 91

USER INSTRUCTIONS & CUSTOMER
CARE GUIDE
PLEASE READ THESE INSTRUCTIONS
CAREFULLY BEFORE OPERATING
YOUR BOILER
THESE INSTRUCTIONS ARE
APPLICABLE TO THE WORCESTER,
BOSCH GROUP BOILER MODEL(S)
STATED ON THE FRONT COVER OF THIS
MANUAL ONLY AND MUST NOT BE
USED WITH ANY OTHER MAKE OR
MODEL OF BOILER.
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 GROUP
TECHNICAL SUPPORT.
DISTANCE LEARNING AND TRAINING
COURSES ARE AVAILABLE FROM
WORCESTER, BOSCH GROUP.
THIS BOILER MUST BE INSTALLED BY A
GAS SAFE REGISTERED, COMPETENT
PERSON. FAILURE TO INSTALL
CORRECTLY COULD LEAD TO
PROSECUTION.
PLEASE LEAVE THIS GUIDE, THE
INSTALLATION INSTRUCTIONS AND
THE COMPLETED BENCHMARK
CHECKLIST WITH THE USER.
NOTE: THE BENCHMARK CHECKLIST
AND SERVICE INTERVAL RECORD CAN
BE FOUND AT THE REAR OF THE
INSTALLATION, COMMISSIONING AND
SERVICE INSTRUCTIONS.
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
USER INSTRUCTIONS &
CUSTOMER CARE GUIDE
WORCESTER BOSCH GREENSTAR 24i/28i Junior
8 716 115 661 (05/2009)
CONTACT INFORMATION
WORCESTER BOSCH:
TECHNICAL: 08705 266241
SERVICE: 08457 256206
LITERATURE: 01905 752556
SALES: 01905 752640
WEBSITE: www.worcester-bosch.co.uk

CONTENTS
WORCESTER BOSCH GREENSTAR 24i/28i Junior
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CONTENTS
INTRODUCTION
DEDICATED TO HEATING COMFORT 1
SAFETY PRECAUTIONS 2
GENERAL NOTES 3
USING YOUR BOILER
CONTROLS 6
OPERATING THE BOILER 7
Switching the boiler on/off 7
Setting the central heating temperature 7
Controlling central heating 7
Frost protection 7
Controlling domestic hot water 8
Fault condition 9
MAINTENANCE
MAINTAINING YOUR BOILER 10
FAULT FINDING 11
FAULT OR BREAKDOWN 12
ENERGY SAVING
TIPS ON ENERGY SAVING 13
GUARANTEE
YOUR GUARANTEE 15
GUARANTEE REGISTRATION 16
INTRODUCTION
USING YOUR
BOILER
ENERGY
SAVING
GUARANTEE
Dedicated to heating comfort
Thank you for purchasing a Greenstar gas-fired condensing combination 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 40 years. This heritage means all 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.
To find out more about Worcester, Bosch Group log onto www.worcester-bosch.co.uk .
MAINTENANCE

EXCELLENCE COMES AS STANDARD WORCESTER BOSCH GREENSTAR 24i/28i Junior
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2
INTRODUCTION
IF YOU SMELL GAS!
DO NOT SMOKE OR STRIKE MATCHES
DO NOT TURN ELECTRICAL SWITCHES ON OR OFF
PUT OUT NAKED FLAMES
OPEN DOORS AND WINDOWS
KEEP PEOPLE AWAY FROM THE AREA AFFECTED
TURN OFF THE CONTROL VALVE AT THE METER
CALL YOUR GAS COMPANY
COMBUSTIBLE AND CORROSIVE MATERIALS
Do not store or use any combustible materials (paper, thinners, paints etc.) inside or
within the vicinity of the boiler.
Chemically aggressive substances can corrode the boiler and invalidate any warranty.
FITTING & MODIFICATIONS
Fitting the boiler, any controls to the boiler 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 boiler,
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.
SAFETY PRECAUTIONS

SAFETY PRECAUTIONS
WORCESTER BOSCH GREENSTAR 24i/28i Junior
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INTRODUCTION
SERVICING
The boiler must be serviced regularly by a competent, qualified person, such as a
Worcester service engineer or alternatively a British Gas or other Gas Safe registered
person.
Always use original spares, to help maintain the economy, safety and reliability of the
boiler and to have the Service Record completed in the Benchmark checklist.
IMPORTANT: Ensure that the service engineer completes the Service Record in
the Benchmark checklist after each service.
The completed Benchmark checklist will be required in the event of
any warranty work and may be required by the local Building Control
Inspector.
NOTE: The Benchmark checklist and service interval record can be found at
the rear of the Installation, Commissioning and Servicing
Instructions.
BENCHMARK STANDARD
‘Benchmark’ is a code of practice for correctly installing, commissioning and servicing
of domestic water heating boilers.
A Benchmark Checklist is provided by the manufacturer for the installer to complete
ALL details together with their Gas Safe registration number and sign to confirm that
the boiler has been installed and commissioned according to the manufacturer’s
instructions.
HEALTH & SAFETY
The boiler contains no asbestos and no substances used in the construction process
that contravene the COSHH Regulations (Control of Substances Hazardous to Health
Regulations 1988).
GENERAL NOTES

GENERAL NOTES
4
To get the best from your boiler please
read these instructions carefully.
SEALED HEATING SYSTEMS
This boiler 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 evenly. 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
replenished for safe and satisfactory
operation of the boiler.
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 boiler and the
terminal will, at times give out a plume of
water vapour. This is quite normal.
The boiler also produces quantities of
condensate which is discharged regularly
by a syphon 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 boiler for safety and
servicing access. Do not restrict this
space with the addition of cupboards,
shelves etc. next to the boiler.
GENERAL NOTES
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 must be where the room thermostat
is located, should be un-controlled and
must be left open. The thermostatic
radiator valves should conform to the
requirements of BS2767:10.
INTRODUCTION
*600mm service clearance required to a fixed surface
(**25mm from removable door or panel)
WORCESTER BOSCH GREENSTAR 24i/28i Junior
8 716 115 661 (05/2009)

SAFETY PRECAUTIONS 5
GENERAL NOTES
INTRODUCTION
+ 30mm
above elbow
200mm*
200mm*
100mm**
600mm***
200mm
**
***
BOILER CLEARANCES -
UNVENTILATED COMPARTMENT
The diagram opposite shows the
minimum space required to install and
service the boiler inside an unventilated
compartment.
** Space required for unventilated areas
with a removable door or panel.
*** 600mm clearance required to a fixed
surface for servicing.
* The boiler must have more clearance in
the unventilated compartment compared
to the ventilated compartment.
Two examples are shown opposite, refer
to the “Installation, commissioning and
servicing instruction manual” for further
information.
Do not add cupboards, shelves etc. to
restrict the space around the boiler.
VENTILATION
This is a room sealed boiler and does not
require any air for combustion from inside
the property. If the boiler is fitted into a
cupboard or a compartment is built
around the boiler 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 boiler casing, if the
clearances shown are maintained.
Do not operate the boiler 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.
WORCESTER BOSCH GREENSTAR 24i/28i Junior
8 716 115 661 (05/2009)

CONTROLS WORCESTER BOSCH GREENSTAR 24i/28i Junior
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CONTROLS
 To gain access to the boiler controls
push at the top of the flap and release.
1. CENTRAL HEATING
TEMPERATURE CONTROL
2. MAINS ON/OFF INDICATOR +
FAULT DIAGNOSTIC LIGHT
3. BURNER ON INDICATOR LIGHT
(GREEN)
4. ECO BUTTON (DOMESTIC HOT
WATER PRE-HEAT ON/OFF)
5. FAULT RESET BUTTON
6. SYSTEM PRESSURE GAUGE
7. POSITION FOR OPTIONAL
PROGRAMMER
USING YOUR
BOILER
1
35
76
4
2
PUSH

OPERATING THE BOILER
WORCESTER BOSCH GREENSTAR 24i/28i Junior
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OPERATING THE BOILER
USING YOUR
BOILER
SWITCHING THE BOILER ON/OFF
Switching on
 Switch on the boiler at the mains supply,
the indicator light shows blue. There
should be no need to switch the boiler off
unless, in the unlikely event, a fault has
occurred.
Switching off
 Should you need to switch off the boiler
then do so at the mains supply.
The blue
indicator light goes out.
NOTE: When the boiler is switched off
frost protection is disabled.
SETTING THE TEMPERATURE
 Turn the temperature control knob to
the desired level, approximate
temperatures for each setting are shown
in the table opposite.
When the burner is lit, the green burner
on indicator light is illuminated.
CONTROLLING CENTRAL HEATING
 Set the timer to the correct time.
 Set room thermostat to the desired
room temperature.
 Set the thermostatic radiator valves to
the desired settings.
FROST PROTECTION
 In the event where the boiler is not to be
used for a period of time, leave power on
and turn the temperature control to .
If the temperature falls below 5°C within
the boiler it will periodically fire to avoid
the possibility of freezing.
 If remote pipework is exposed to
low temperatures, ensure that the
installer has added a frost
thermostat.
Min --- 40°C
1--- 47°C
2--- 53°C
3--- 61°C
4--- 68°C
5--- 74°C
6--- 80°C
Max --- 82°C

HOT WATER TEMPERATURE
The hot water temperature is fixed at
55°C and can not be adjusted.
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.
 Press and hold the ECO button to
select either, not illuminated or
illuminated:
When the ECO button is not
illuminated the boiler will be in pre-
heat mode (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.
OPERATING THE BOILER
OPERATING THE BOILER WORCESTER BOSCH GREENSTAR 24i/28i Junior
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USING YOUR
BOILER