Worcester GREENSTAR 12i Instruction Manual
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Worcester GREENSTAR 12i Instruction Manual

Installation, commissioning & servicing wall hung rsf gas fired condensing boiler
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See also: Installation, Commissioning & Servicing Instructions , Instructions for Using
INSTRUCTION MANUAL
INSTALLATION, COMMISSIONING & SERVICING
WALL HUNG RSF GAS FIRED CONDENSING BOILER
GREENSTAR 12i/24i System
FOR SEALED CENTRAL HEATING SYSTEMS AND INDIRECT FED
DOMESTIC HOT WATER
THIS BOILER IS USED WITH
NATURAL GAS OR LPG (Cat II 2H3P TYPE C13, C33 & C53)
NATURAL GAS 12i System GC NUMBER: 41 311 67
LIQUID PETROLEUM GAS 12i System GC NUMBER: 41 311 69
UK/IE
24i System GC NUMBER: 41 311 68
24i System GC NUMBER: 41 311 70

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Summary of Contents for Worcester GREENSTAR 12i

  • Page 1 INSTRUCTION MANUAL INSTALLATION, COMMISSIONING & SERVICING WALL HUNG RSF GAS FIRED CONDENSING BOILER GREENSTAR 12i/24i System FOR SEALED CENTRAL HEATING SYSTEMS AND INDIRECT FED DOMESTIC HOT WATER THIS BOILER IS USED WITH NATURAL GAS OR LPG (Cat II 2H3P TYPE C13, C33 & C53)

  • Page 2: Installation & Servicing Instructions

    FERNOX 01799 550811 www.fernox.com SENTINEL 0800 389 4670 www.sentinel-solutions.net FLUE TERMINAL GUARDS: TOWER FLUE COMPONENTS LTD. Vale Rise, Tonbridge TN9 1TB 01732 351555 INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System INSTALLATION & 8 716 115 167b (03/2009) SERVICING INSTRUCTIONS...

  • Page 3: Table Of Contents

    BOILER FUNCTION PROTECTION FUNCTION ADDITIONAL INSTRUCTIONS FOR FITTING OPTIONAL DIVERTER VALVE CAN BE FOUND AT THE REAR OF THIS MANUAL BENCHMARK CHECKLIST SERVICE INTERVAL RECORD SHEET INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System CONTENTS 8 716 115 167b (03/2009)

  • Page 4: Safety Precautions & Symbols

    INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System SAFETY PRECAUTIONS 8 716 115 167b (03/2009) & INSTALLATION REGULATIONS...

  • Page 5: General Information

    Pre-wired and pre-plumbed Item Greenstar 12i/24i System Installation/Servicing Instructions ...1 Galvanised steel inner frame Users Instructions ..........1 Digital control system Consumer Guarantee Card .

  • Page 6: Technical Data

    Packaged boiler weight 44.4 44.4 44.4 44.4 Total boiler weight 39.5 39.5 39.5 39.5 Lift weight 27.1 27.1 27.1 27.1 SEDBUK 90.1 90.2 91.4 92.0 INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System TECHNICAL DATA 8 716 115 167b (03/2009)

  • Page 7: Layout & Components

    20 FLOW 21 ACCESS COVER FOR TRANSFORMER & 22 PUMP 23 GAS VALVE 24 FAN 25 MANUAL VENT POINT 26 FAN PRESSURE TEST POINT INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System LAYOUT & COMPONENTS 8 716 115 167b (03/2009)
  • Page 8 42 CH TEMPERATURE CONTROL 43 POSITION FOR OPTIONAL PROGRAMMER 44 SERVICE MODE BUTTON 45 BURNER ON INDICATOR LIGHT (GREEN) 46 MASTER SWITCH ON/OFF INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System LAYOUT & COMPONENTS 8 716 115 167b (03/2009)

  • Page 9: Cleaning Primary Systems

    • It may be necessary to use a power flushing machine to aid the cleansing procedure in some circumstances INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System CLEANING PRIMARY SYSTEMS 8 716 115 167b (03/2009)

  • Page 10: Mains Supply

    Generally the appliance would need to be within 3 to 4 metres of the gas meter. However, this will depend upon the distribution pipe size and route. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System MAINS SUPPLY 8 716 115 167b (03/2009)

  • Page 11: Water Systems & Pipework

    • Pressurise the extra expansion vessel (B) to cylinder the same figure as the expansion vessel built into the appliance. • Do not use galvanised pipes or radiators. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System WATER SYSTEMS & PIPEWORK 8 716 115 167b (03/2009)

  • Page 12: Condensate Pipework

    INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System CONDENSATE PIPEWORK 8 716 115 167b (03/2009)

  • Page 13: Pressure Relief Pipework

    (as shown) to help prevent hazard. L - Outside wall O,M - Drain pipe N - External drain INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System PRESSURE RELIEF PIPEWORK 8 716 115 167b (03/2009)

  • Page 14: Boiler Location & Clearances

    High Minimum free Minimum level area 122 cm free area 61 cm Minimum free Minimum level area 122 cm free area 61cm INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System BOILER LOCATION & CLEARANCES 8 716 115 167b (03/2009)

  • Page 15: Boiler Location

    Additional RCD (Residual Current Device) pro- tection may be required. Refer to the latest IEE wiring regulations. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System BOILER LOCATION & CLEARANCES 8 716 115 167b (03/2009)

  • Page 16: Plumbing Manifold

    ADDITIONAL INFORMATION section at the back of this book. Flow 22mm Return 22mm Mains Gas Supply 22mm INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System PLUMBING MANIFOLD 8 716 115 167b (03/2009)

  • Page 17: Flue Options

    12 i system 2,400mm 11,000mm Maximum total flue length 24 i system 2,400mm 11,000mm 100mmØ 125mmØ 12 i system 2,600mm 11,000mm 24 i system 2,600mm 11,000mm INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System FLUE OPTIONS 8 716 115 167b (03/2009)

  • Page 18: Flue Terminal Positions

    The guard must be spaced equally (mini- mum 50 mm) around the flue and fixed to the wall with plated screws. See Contact Information (inside front cover). INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System FLUE TERMINAL POSITIONS 8 716 115 167b (03/2009)
  • Page 19 INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System FLUE TERMINAL POSITIONS 8 716 115 167b (03/2009)

  • Page 20: Installation

    2. Remove template (F) and wall mounting frame (E) from the packaging. 3. Remove boiler bottom panel (D), front fascia (H) and installer pack (C). INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System UNPACKING WALL FRAME AND 8 716 115 167b (03/2009) ANCILLARY ITEMS...

  • Page 21: Wall Mounting Template / Flue Opening

    This kit can be used in conjunction with the optional filling loop 7 716 192 281(not sup- plied with the boiler. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System WALL MOUNTING PLATE FLUE OPENING 8 716 115 167b (03/2009)

  • Page 22: Unpacking The Appliance

    6.2). Remove any packaging within the boiler and the packaging base (C). CAUTION: Caps fitted to pipes must be removed before hanging the boiler. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System UNPACKING THE APPLIANCE 8 716 115 167b (03/2009)

  • Page 23: Boiler Connections

    UP until the stop on the inside of the handle is over the shoulder of the metal bracket to secure in place. Stop in locked position INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System BOILER CONNECTIONS 8 716 115 167b (03/2009)
  • Page 24 8. Connect the pressure relief drain pipe to 15mm compression joint (H) using the nut and olive supplied in the hardware literature pack. 22mm 22mm 22mm INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System BOILER CONNECTIONS 8 716 115 167b (03/2009)

  • Page 25: Flue Installation

    The aluminium tape is not required when reducing the terminal. After cutting, the end must be square and free from burrs to prevent damage to the 130mm flue seals. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System FLUE INSTALLATION 8 716 115 167b (03/2009)
  • Page 26 ±80° allow condensate to run back into the boiler for safe disposal. Do not attempt to force beyond the limit stops. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System FLUE INSTALLATION 8 716 115 167b (03/2009)
  • Page 27 • The flue is set at an angle of 3° or 52mm per 1m length. Flat at back This screw should be fitted last for easier installation when rear exit INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System FLUE INSTALLATION 8 716 115 167b (03/2009)

  • Page 28: Condensate Connection

    FITTING THE WALL FRAME DIVE RTE R VALVE in the ADDITIONAL CONNECTOR INFORMATION section at the back of this book. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System CONDENSATE CONNECTION 8 716 115 167b (03/2009)

  • Page 29: Electrical

    This option is also covered in the Fault Finding Guide on page 55 of these instructions. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System ELECTRICAL 8 716 115 167b (03/2009)

  • Page 30: Position Of Wired Components

    POSITION OF WIRED COMPONENTS INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System POSITION OF WIRED COMPONENTS 8 716 115 167b (03/2009)

  • Page 31: Pre-Commissioning Checks

    22mm 22mm 22mm Preplumbing manifold connector Condensate pipe INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System PRE-COMMISSIONING CHECKS 8 716 115 167b (03/2009)

  • Page 32: Filling The System

    8 Rotate the adjustable pointer on the pressure gauge to record the set system pressure. 9 Isolate and remove filling loop connection to system. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System FILLING THE SYSTEM 8 716 115 167b (03/2009)

  • Page 33: Starting The Appliance

    To reset press and hold the reset button (E) for 2 seconds. The boiler will be reset. CAUTION: DO NOT PRESS POWER INDICATOR (B) TO RESET BOILER. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System STARTING THE APPLIANCE 8 716 115 167b (03/2009)

  • Page 34: Water Treatment

    The addition of sealing agents to the system water is not recommended as this can cause problems with deposits left in the heat exchanger. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System WATER TREATMENT 8 716 115 167b (03/2009)

  • Page 35: Commissioning

    F - Service button G - Not used H - System pressure gauge I - Cover or optional programmer Inlet Test Nipple DUNGS VALVE Inlet Test Nipple INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System COMMISSIONING 8 716 115 167b (03/2009)

  • Page 36: Finishing Commissioning

    If the appliance is unused and exposed to freezing conditions, shut off all the mains supplies and drain the system and boiler. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System FINISHING COMMISSIONING 8 716 115 167b (03/2009)

  • Page 37: Inspection And Service

    Refill and re-pressurise if applicable as described in Commissioning. Operate the appliance and take note of any irregularities. Refer to Fault Finding for rectification procedures. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System INSPECTION AND SERVICE 8 716 115 167b (03/2009)
  • Page 38 2. Lowering boiler control to service position 2.1 Remove screw (C) securing control. 2.2 Gently pull forward until it comes to rest in service position. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System INSPECTION AND SERVICE 8 716 115 167b (03/2009)
  • Page 39 There is a special accessory kit available specifically designed for cleaning the heat exchanger. If required order 7 716 192 312. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System INSPECTION AND SERVICE 8 716 115 167b (03/2009)
  • Page 40 Catch the debris and condensate from the syphon into a suitable container. Re-fit the drainage cap (E) to bottom of the syphon. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System INSPECTION AND SERVICE 8 716 115 167b (03/2009)
  • Page 41 Disconnect spark electrode and flame sensor connections (K). Remove clamping plate (L). Remove spark/flame electrode assembly from boiler. Remove seal from the top of the heat exchanger. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System INSPECTION AND SERVICE 8 716 115 167b (03/2009)
  • Page 42 BETWEEN THE AIR/GAS MANIFOLD AN D TH E H EAT E XCHANG E R I S DISTURBED THE SEALING GASKET MUST BE REPLACED. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System INSPECTION AND SERVICE 8 716 115 167b (03/2009)

  • Page 43: Replacement Of Parts

    Remove electrical connections. Undo the flue connection from the sump and push the flue tube up. Push the flue limit thermostat outwards from the sump. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System REPLACEMENT OF PARTS 8 716 115 167b (03/2009)
  • Page 44 Disconnect electrical connections. Replace valve with new seals and check for gas soundness. NOTE: The valve will require setting; follow procedure “Setting the air/gas ratio”. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System REPLACEMENT OF PARTS 8 716 115 167b (03/2009)
  • Page 45 Pull transformer upwards from PCB. Spare Fuse order T1.6L 250V F2 T2.5H 250V F1 T500L 250V F3 INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System REPLACEMENT OF PARTS 8 716 115 167b (03/2009)
  • Page 46 IMPORTANT: ENSURE CODE PLUG IS RE-FITTED TO THE NEW CONTROL. IF THIS IS NOT DONE THE BOILER WILL INDICATE ERROR AND WILL NOT FUNCTION. 10.3 INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System REPLACEMENT OF PARTS 8 716 115 167b (03/2009)
  • Page 47 Lift up assembly and remove from boiler. NOTE: After re-assembly, check CO/CO levels as described in the setting of the air/gas ratio section. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System REPLACEMENT OF PARTS 8 716 115 167b (03/2009)
  • Page 48 Check CO/CO 2 levels as described in the “setting the air/gas ratio” section. 15.4 15.2 15.3 15.1 INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System REPLACEMENT OF PARTS 8 716 115 167b (03/2009)
  • Page 49 18.2 Lift the air vent (E) out of the housing and remove. To refit, follow the above in reverse. 18.1 18.2 INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System REPLACEMENT OF PARTS 8 716 115 167b (03/2009)
  • Page 50 21.2 Withdraw the drain tap from its housing To refit, follow the above in reverse. Ensure any seals that have been disturbed are renewed. 21.1 21.2 INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System REPLACEMENT OF PARTS 8 716 115 167b (03/2009)
  • Page 51 23.2 Withdraw the pressure release valve (A) from its housing. To refit, follow the above in reverse. Ensure any seals that have been disturbed are renewed. 23.1 23.2 INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System REPLACEMENT OF PARTS 8 716 115 167b (03/2009)
  • Page 52 Gently raise the boiler off the mounting frame. Replace expansion vessel and refit the boiler to the mounting frame. Follow the commissioning procedure in this manual. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System REPLACEMENT OF PARTS 8 716 115 167b (03/2009)

  • Page 53: Setting The Air/Gas Ratio

    Re-assemble and refit boiler case. If fitted to an S or Y plan system, the system must only be run in central heating mode. ‘C’ INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System REPLACEMENT OF PARTS 8 716 115 167b (03/2009)
  • Page 54 Re-assemble and refit boiler case. hot water circuits. If fitted to an S or Y plan system, the system must only be run in central heating mode. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System REPLACEMENT OF PARTS 8 716 115 167b (03/2009)

  • Page 55: Short Parts List

    WORCESTER Part No. 1 904 522 740 0 GC No. E27 305 21 Fuse 0.5 Amp F3 WORCESTER Part No. 1 904 522 730 0 GC No. E27 300 INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System REPLACEMENT OF PARTS 8 716 115 167b (03/2009)

  • Page 56: Conversion

    24kW LPG with internal diverter valve - 1115 24kW LPG with external diverter valve - 1111 THE SETTING THE AIR/GAS RATIO SECTION OF THIS MANUAL. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System LPG CONVERSION 8 716 115 167b (03/2009)

  • Page 57: Fault Finding & Diagnosis

    FAULT FINDING NOTE : This fault finding information is for guidance only. Worcester cannot be held responsible for costs incurred by persons not deemed to be competent. The electronic control system for this boiler incorporates a blue central indicator. This normally confirms the permanent mains supply but, by flashing at different rates during a fault, provides a guide to the cause as listed.

  • Page 58: Boiler Function

    Disregard this page and refer to the correct versions for CENTRAL HEATING and DHW FUNCTIONS in the ADDITIONAL INFORMATION section at the back of this book. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System BOILER FUNCTION 8 716 115 167b (03/2009)

  • Page 59: Protection Function

    PROTECTION FUNCTION Boiler temperature Run autofroststat below 8°C function Pump run 5 seconds Pump antiseize every 24hrs INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System PROTECT FUNCTION 8 716 115 167b (03/2009)
  • Page 61 ADDITIONAL INSTRUCTIONS FOR GREENSTAR 12i/24i System WITH OPTIONAL INTEGRAL DIVERTER VALVE WALL HUNG RSF GAS-FIRED CONDENSING BOILER FOR SEALED CENTRAL HEATING SYSTEMS AND INDIRECTLY FED DOMESTIC HOT WATER DIVERTER KIT NUMBERS: 12kW 7 716 192 566 24KW 7 716 192 409...
  • Page 62 NOW R ETU R N TO TH E MAIN IN STR UCTION S PAG E 16 TO CONTINUE INSTALLATION. Flow 22mm CH Return 22mm Mains Gas Supply 22mm Cylinder Return 15mm INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System PLUMBING MANIFOLD 8 716 115 167b (03/2009)
  • Page 63 Re-tighten the clamping plate by re-tightening the two screws (B) as shown in fig: 2. • 4.1 On completion the pipe assembly should look as shown. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System BOILER CONNECTIONS 8 716 115 167b (03/2009)
  • Page 64 UP until the stop on the inside of the handle is over the shoulder of the metal bracket to secure in place. Stop in locked position INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System BOILER CONNECTIONS 8 716 115 167b (03/2009)
  • Page 65 NOW R ETU R N TO TH E MAIN INSTRUCTIONS PAGE 25 (FLUE INSTALLATION) TO CONTINUE INSTALLATION. 22mm 22mm 15mm 22mm INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System BOILER CONNECTIONS 8 716 115 167b (03/2009)
  • Page 66 (see ELECTRICAL on the following page). Code plug numbers 12kW i System KIT: NATURAL GAS 1118 1119 24kW i System KIT: NATURAL GAS 1114 1115 INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System BOILER CONNECTIONS 8 716 115 167b (03/2009)
  • Page 67 ST17 (see following page). THE OPTIONAL INTEGRAL DIVERTER VALVE IS INCOMPATIBLE WITH A MAINS PRESSURE UNVENTED CYLINDER. IF INSTALLING AN UNVENTED CYLINDER USE AN EXTERNAL DIVERTER VALVE. INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System ELECTRICAL 8 716 115 167b (03/2009)
  • Page 68 POSITION OF WIRED COMPONENTS INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System POSITION OF WIRED COMPONENTS 8 716 115 167b (03/2009)
  • Page 69 PAG E ( F I LLI NG TH E SYSTE M ) TO CONTINUE INSTALLATION. 22mm 22mm 15mm 22mm Preplumbing manifold connector Condensate pipe INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System PRE- COMMISSIONING CHECKS 8 716 115 167b (03/2009)
  • Page 70 BOILER FUNCTION INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System BOILER FUNCTION 8 716 115 167b (03/2009)
  • Page 76 5. Is the incoming gas pressure at least 18mbar with the boiler at maximum output? Dedicated to heating comfort Worcester, Bosch Group Cotswold Way, Warndon, Worcester WR4 9SW. Tel. 01905 754624 Fax. 01905 754619 Worcester, Bosch Group is a brand name of Bosch Thermotechnology Ltd. www.worcester-bosch.co.uk 8 716 115 167b (03/2009)

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Greenstar 24i

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