USER INSTRUCTIONS WALL HUNG RSF GAS FIRED CONDENSING COMBINATION BOILER GREENSTAR 24i Junior/28i Junior 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 & C53) Model Natural Gas 6720643356-00.
PREFACE 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.
CONTENTS CONTENTS 1 Symbols and safety precautions . . . . . . . . . . 4 1.1 Explanation of symbols . . . . . . . . . . . . 4 1.2 Safety precautions . . . . . . . . . . . . . . . 4 2 General Information . . . . . . . . . . . . . . . . . . . . 5 3 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.1 Operating the boiler . . . . . . . . . . . . . . 7 3.1.1 Setting the central heating temperature ............................... 7 3.1.2 Switch off the central heating . . . . . . 7 3.
SYMBOLS AND SAFETY PRECAUTIONS 1 SYMBOLS AND SAFETY PRECAUTIONS 1.1 EXPLANATION OF SYMBOLS WARNING SYMBOLS Safety instructions in this document are framed and identified by a warning triangle which is printed on a grey background. 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.
GENERAL INFORMATION 2 GENERAL INFORMATION SERVICING 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. ▶ The boiler must be serviced regularly by a competent, qualified person, such as a Worcester service engineer or other Gas Safe registered engineer.
CONTROLS 3 CONTROLS ▶ To gain access to the boiler controls push the top centre of the flap and release. 2 3 4 5 6 7 8 9 6720643356-13.1Wo 1 Fig.
CONTROLS 3.1 OPERATING THE BOILER 3.1.1 SETTING THE CENTRAL HEATING TEMPERATURE Min --- 40 °C 1 --- 47 °C 2 --- 53 °C 3 --- 61 °C 4 --- 68 °C 5 --- 74 °C 6 6 --- 80 °C max Max --- 82 °C 2. 3 4 5 2 1. Fig. 2 1 6720643356-05.1Wo 1. Turn the central heating temperature control knob to the desired level. Temperatures given in the figure below are approximate. 2. The Burner indicator (green) will illuminate to show that the boiler is running. Central heating temperature control 3.1.
CONTROLS 3.1.4 SETTING THE HOT WATER TEMPERATURE 1. Turn the hot water temperature control knob to the desired level. reset eco 4 3 5 1 e 2 6 max Fig. 4 4 1. 6720643356-07.1Wo 3 2 1 6 min max Hot water temperature 3.1.5 DOMESTIC HOT WATER PRE-HEAT The hot water heat exchanger is kept “pre-heated” to reduce the time taken to deliver hot water at the tap. Pre-heat is enabled by default, during the initial boiler start up and the ECO button is not illuminated.
CONTROLS 3.1.6 BOILER RESET In the event of a fault, the reset button will flash once per second and the blue mains indicator light will flash. 1. To reset the boiler press the reset button for approximately five seconds. When the boiler resets the reset button will no longer be illuminated. 2. The mains indicator will no longer be flashing. 1. reset eco 3 2 1 Fig. 6 4 3 5 2 4 e 6 1 6 max min max 6720643356-09.1Wo 2.
SYSTEM PRESSURE 4 SYSTEM PRESSURE 4.1 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 indicated on the pressure gauge. ▶ Check regularly that the pressure is maintained. ▶ If the pressure gauge reads less than 1 bar then the system requires re-charging.
SYSTEM PRESSURE 4.3 OPTIONAL INTEGRAL KEYLESS FILLING LINK Locate filling link and follow instructions for re-pressurising. 1. If the needle on the appliance pressure gauge reads less than 1 bar, re-charge the system. 2. Pull the blue lever down to start the filling process. 3. Monitor the pressure gauge on the boiler fascia. 1. 1 3. 2. 1 bar Min Fig. 9 4. Max 67206800521-06.2Wo 1.5 bar Keyless filling link 4. When the needle reaches between 1 to 1.
SYSTEM PRESSURE 4.4 OPTIONAL INTEGRAL KEYED FILLING LINK Locate filling key and follow instructions for re-pressurising. 1. Push the filling key firmly into the body of the filling link, ensuring the arrow on the key shaft lines up with the open padlock symbol. 2. Turn the filling key to the right, to the stop, so the arrow now lines up with the closed padlock symbol. This bridges the gap between the two sections of the filling loop. 3.
SYSTEM PRESSURE 4.5 EXTERNAL FILLING LOOP Once the external filling loop has been located, follow the instructions for re-pressurising the system. 1. Unscrew blanking cap. 2. Attach the hose to the valves, screw on hand-tight. 3. Turn the handle/screwdriver slot through 90° to open the valves. 4. The handle/screwdriver slot will be in-line with the valves 4. 1. 3. 2. 6. 4. 3. 6. 1.5 bar A 1 bar Max 2 1 3 5. 5. 7. 0 Fig. 11 bar 4 6720643356-12.2Wo Min External filling loop 5.
SERVICE CLEARANCES 5 SERVICE CLEARANCES Your installer will have provided adequate space around the boiler for safety and servicing access. CAUTION: Restricted space. The boiler may overheat. ▶ Do not restrict this space with the addition of cupboards, shelves etc. next to the boiler. + 30 mm above elbow 5 mm 600 mm 200 mm Fig. 12 6 6720643356-01.1Wo 5 mm Service clearances MAINTAINING YOUR BOILER Your new gas-fired boiler represents a long term investment in a reliable, high quality product.
FAULT FINDING 7 FAULT FINDING If a boiler fault occurs, please read the following page thoroughly before contacting Worcester, Bosch Group.
FAULT OR BREAKDOWN 8 FAULT OR BREAKDOWN This boiler is supported in the UK and Eire by Worcester, Bosch Group. Specialist Service Engineers are available to attend a breakdown occurring on this boiler. Invoices for attendance and repair work carried out on this boiler by any third party will not be accepted. • No charge will be made for parts and/or labour providing: A boiler fault is found and the appliance has been installed within the past 24 months.
TIPS ON ENERGY SAVING 9 TIPS ON ENERGY SAVING HEATING ECONOMICALLY The boiler provides a high level of comfort whilst keeping gas consumption and the environment effects as low as possible. The gas supply to the burner is controlled according to the level of demand for heat. The boiler operates with a low flame if the demand for heat reduces. The technical term for this process is modulating control.
YOUR GUARANTEE 10 YOUR GUARANTEE This boiler is guaranteed against faulty materials or workmanship for a period of 2 years from the date of installation subject to the following terms and conditions. • During the period of this guarantee any components of the boiler which are proven to be faulty or defective in manufacture will be exchanged or repaired free of charge by Bosch Thermotechnology Ltd.
GLOSSARY 12 GLOSSARY Central heating systems All radiators must be 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. Should water leaks be found or if excessive venting is required, then a service engineer must be contacted to inspect the installation and rectify any fault.
WORCESTER, BOSCH GROUP: Worcester, Bosch Group Cotswold Way, Warndon, Worcester WR4 9SW. Tel. 0844 892 9900 Worcester, Bosch Group is a brand name of Bosch Thermotechnology Ltd. worcester-bosch.co.uk Document No.
