Bosch 24i junior User Manual

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USER INSTRUCTIONS &

CUSTOMER CARE GUIDE

Greenstar 24i junior / 28i junior

WALL HUNG GAS-FIREDCONDENSING COMBINATION BOILER

FOR SEALED CENTRAL HEATING SYSTEMS & DOMESTIC HOT WATER

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

CONTACT INFORMATION

WORCESTER BOSCH:

TECHNICAL: 08705 266241

SERVICE: 08457 256206

LITERATURE: 01905 752556

SALES: 01905 752640

WEBSITE: www.worcester-bosch.co.uk

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)

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

Dedicated to heating comfort

Thank you for purchasing a Greenstar gas-firedcondensing 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-nonsense2 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 .

USING YOUR MAINTENANCE INTRODUCTION BOILER

ENERGY

SAVING

GUARANTEE

WORCESTER BOSCH GREENSTAR 24i/28i Junior 8 716 115 661 (05/2009)

CONTENTS 1

INTRODUCTION

SAFETY PRECAUTIONS

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

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

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.

2 EXCELLENCE COMES AS STANDARD

WORCESTER BOSCH GREENSTAR 24i/28i Junior

8 716 115 661 (05/2009)

GENERAL NOTES

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).

INTRODUCTION

WORCESTER BOSCH GREENSTAR 24i/28i Junior 8 716 115 661 (05/2009)

SAFETY PRECAUTIONS

3

 

INTRODUCTION

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-pressurisedand 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.

GENERAL NOTES

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.

+ 30mm above elbow

5mm

5mm

25mm*

600mm**

200mm

*600mm service clearance required to a fixed surface

(**25mm from removable door or panel)

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-controlledand must be left open. The thermostatic radiator valves should conform to the requirements of BS2767:10.

4 GENERAL NOTES

WORCESTER BOSCH GREENSTAR 24i/28i Junior

8 716 115 661 (05/2009)

 

 

 

 

 

 

 

 

GENERAL NOTES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+ 30mm

BOILER CLEARANCES -

 

 

 

 

 

UNVENTILATED COMPARTMENT

 

 

 

 

above elbow

 

 

 

 

 

 

 

The diagram opposite shows the

 

 

 

 

 

 

 

minimum space required to install and

 

 

 

 

 

 

 

service the boiler inside an unventilated

 

 

200mm*

compartment.

 

 

** Space required for unventilated areas

 

 

with a removable door or panel.

 

 

 

 

 

 

200mm*

*** 600mm clearance required to a fixed

 

100mm**

surface for servicing.

 

 

600mm***

 

 

 

 

 

 

 

 

 

 

 

* 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

 

200mm

 

 

 

 

 

 

 

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.

INTRODUCTION

WORCESTER BOSCH GREENSTAR 24i/28i Junior 8 716 115 661 (05/2009)

SAFETY PRECAUTIONS

5

 

USING YOUR BOILER

CONTROLS

To gain access to the boiler controls push at the top of the flap and release.

PUSH

3

 

 

7

4

5

6

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-HEATON/OFF)

 

 

 

 

 

 

 

 

 

 

 

 

5.

FAULT RESET BUTTON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6.

SYSTEM PRESSURE GAUGE

 

 

 

 

 

 

 

 

 

 

 

 

7.

POSITION FOR OPTIONAL

1

2

 

 

 

 

 

 

 

PROGRAMMER

6 CONTROLS

WORCESTER BOSCH GREENSTAR 24i/28i Junior

8 716 115 661 (05/2009)

Min ---40°C

1---47°C

2---53°C

3---61°C

4---68°C

5---74°C

6---80°C

Max ---82°C

OPERATING THE 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.

USING YOUR BOILER

WORCESTER BOSCH GREENSTAR 24i/28i Junior 8 716 115 661 (05/2009)

 

 

7

OPERATING THE BOILER

 

USING YOUR BOILER

OPERATING THE BOILER

HOT WATER TEMPERATURE

The hot water temperature is fixed at 55°C and can not be adjusted.

DOMESTIC HOT WATER PRE-HEAT

Pre-heatreduces 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 orilluminated:

When the ECO button is not illuminated the boiler will be in preheat 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 nopre-heatavailable.

8 OPERATING THE BOILER

WORCESTER BOSCH GREENSTAR 24i/28i Junior

8 716 115 661 (05/2009)