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Bosch 47-311-84 Installation, Commissioning And Servicing Instructions
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Bosch 47-311-84 Installation, Commissioning And Servicing Instructions

Bosch 47-311-84 Installation, Commissioning And Servicing Instructions

Wall hung rsf gas-fired condensing combination boiler for sealed central heating systems and mains fed domestic hot water
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INSTALLATION, COMMISSIONING AND SERVICING
INSTRUCTIONS
WALL HUNG RSF GAS-FIRED CONDENSING COMBINATION BOILER
GREENSTAR 25Si/30Si
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)
Natural Gas
Liquid Petroleum Gas
UK/IE
Model
GC Number
25 Si
47-311-84
30 Si
47-311-85
25 Si
47-311-88
30 Si
47-311-89

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Summary of Contents for Bosch 47-311-84

  • Page 1 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 GC Number Natural Gas 25 Si 47-311-84 30 Si 47-311-85 Liquid Petroleum Gas 25 Si 47-311-88 30 Si...
  • Page 2 CONTENTS CONTENTS 5.6.3 Domestic hot water: ....41 KEY TO SYMBOLS AND SAFETY INSTRUCTIONS 3 Finishing commissioning ... . 42 Explanation of symbols .
  • Page 3 KEY TO SYMBOLS AND SAFETY INSTRUCTIONS KEY TO SYMBOLS AND SAFETY INSTRUCTIONS EXPLANATION OF SYMBOLS PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE STARTING INSTALLATION. WARNING SYMBOLS THESE INSTRUCTIONS ARE APPLICABLE TO THE WORCESTER APPLIANCE MODEL(S) STATED ON THE Safety instructions in this document are FRONT COVER OF THIS MANUAL ONLY AND MUST NOT framed and identified by a warning triangle BE USED WITH ANY OTHER MAKE OR MODEL OF...
  • Page 4 KEY TO SYMBOLS AND SAFETY INSTRUCTIONS SAFETY PRECAUTIONS FITTING AND MODIFICATIONS Fitting the appliance and any controls to the appliance IF YOU SMELL GAS: may only be carried out by a competent engineer in B CALL NATIONAL GAS EMERGENCY SERVICE ON accordance with the current Gas Safety (Installation and 0800 111 999 Use) Regulations.
  • Page 5 KEY TO SYMBOLS AND SAFETY INSTRUCTIONS British Standards: BOILER FEATURES AND CHECKLIST • Pre-wired and pre-plumbed Where no specific instruction is given, reference should • Galvanised steel inner frame be made to the relevant British Standard codes of Practice. • Digital control system •...
  • Page 6 APPLIANCE INFORMATION APPLIANCE INFORMATION APPLIANCE Depth to wall 330mm (When fitted to wall frame) 700mm* 400mm * 710mm to top of case front 6720643895-01.2Wo STANDARD PACKAGE: Wall hung gas fired condensing combi boiler for central heating and domestic hot water Wall mounting frame Hardware literature pack (see checklist) Bottom Panel...
  • Page 7 APPLIANCE INFORMATION TECHNICAL DATA DESCRIPTION NATURAL GAS Low NOx UNIT 25Si 25 & 30Si 30Si 25Si 30Si Domestic Hot Water Minimum heat input 7.00 7.00 9.64 9.64 Maximum rated heat output Maximum rated heat input 25.51 30.61 25.51 30.61 Gas flow rate - Max. 10 minutes from lighting Low NOx Natural Gas G20 m³/h...
  • Page 8 APPLIANCE INFORMATION LAYOUT Fig. 1 Main boiler components 6 720 643 895b (2011/08)
  • Page 9 APPLIANCE INFORMATION Expansion Vessel Left side hand-hold for lifting boiler Flow temperature sensor (NTC) Plate to Plate heat exchanger Removable panel - for servicing Gas valve Electrode assembly Flue air pressure switch connection (not used) Overheat thermostat Securing nut - Air/Gas manifold clamp Fan guard Silicon tube - heat exchanger air vent Manual vent point...
  • Page 10 APPLIANCE INFORMATION Fig. 3 Additional components Burner ON indicator light (green) CH return isolator Power ON/OFF indicator/fault diagnostic light (blue) DCW mains in isolator Position for optional programmer Gas inlet connection 22 mm & isolator Reset button DHW connection System pressure gauge CH flow isolator ECO button Condensate connection...
  • Page 11 PRE-INSTALLATION PRE-INSTALLATION CLEANING PRIMARY SYSTEMS B It may be necessary to use a power flushing machine NOTICE: to aid the cleansing procedure in some B All the following Pre-Installation sections circumstances. must be read and requirements met B Close the drain cocks and refill with fresh water and before starting boiler or flue installations.
  • Page 12 PRE-INSTALLATION MAINS SUPPLY 3.2.3 WATER SUPPLY WATER MAINS PRESSURE: 3.2.1 ELECTRICAL SUPPLY • Supply: 230V - 50 Hz, 140 Watts • Minimum mains water pressure: 1.3 bar for 25 Si and • Cable: PVC insulated 0.75 mm (24 x 0.2 mm) 2.0 bar for the 30 Si, for maximum performance.
  • Page 13 PRE-INSTALLATION WATER SYSTEMS AND PIPE WORK PLASTIC PIPE WORK: SYSTEM FILL • Any plastic pipe work must have a polymeric barrier Mains Heating with 600mm (minimum) length of copper pipe supply return connected to the boiler. Hose union • Plastic pipe work used for underfloor heating must be correctly controlled with a thermostatic blending valve limiting the temperature of the circuits to Test point...
  • Page 14 PRE-INSTALLATION CONDENSATE PIPE WORK Alternatively if the first option is not possible an internal NOTICE: kitchen or bathroom waste pipe, washing machine B Where a new or replacement boiler is waste pipe etc. can be used. being installed, access to an internal Ensure that the condensate drain pipe is connected “gravity discharge”...
  • Page 15 PRE-INSTALLATION 3.4.2 EXTERNAL CONNECTIONS FITTING AN EXTERNAL AIR BREAK • Refer to figure 10 when a rain water down pipe is NOTICE: Freezing conditions used to dispose of condensate. B Pipe work length should be kept to a • An air break must be installed in the 43mm pipe work, minimum and the route as vertical as between the boiler condensate outlet and the possible.
  • Page 16 PRE-INSTALLATION PRESSURE RELIEF PIPE WORK CONDENSATE SOAK AWAY • The condensate drainage pipe may be run above or NOTICE: below the ground to the soak away. The examples B The pressure relief valve is a safety device shown on this page run above ground. for the boiler and if activated may •...
  • Page 17 PRE-INSTALLATION BOILER LOCATION AND CLEARANCES 3.6.1 INSTALLATION 3.6.3 COMPARTMENTS: This boiler is only suitable for installing internally within Follow the requirements of BS6798 and BS5440 Part 2 a property at a suitable location onto a fixed, rigid and note: surface at least the same size as the boiler and capable •...
  • Page 18 PRE-INSTALLATION 3.6.5 BOILER CLEARANCES - UNVENTILATED COMPARTMENTS: The tables below show the options for the minimum space required to install and service the boiler inside an unventilated compartment. 3.6.6 UNVENTILATED COMPARTMENTS - INSTALLATION CLEARANCES CAUTION: CLEARANCES B Top and bottom clearances must not be reduced below the values shown in table 15 as they are the minimum clearances required for servicing.
  • Page 19 PRE-INSTALLATION PLUMBING MANIFOLD 3.7.1 CONNECTIONS 1 2 3 Heating System 22mm compression fittings 15mm compression fittings 22mm compression fittings Tab. 18 Use the fittings supplied in the Hardware literature pack. • If the boiler pipes are to be run behind the appliance ensure that the pipes pass through the slot in the white cardboard guide (A).
  • Page 20 PRE-INSTALLATION FLUE OPTIONS CAUTION: Non accessible flue systems: Plume management kits are available for the 60/100 horizontal flue system. B Where a flue system is not going to be Refer to the manual supplied with the plume accessible, provision must be made for management kits for complete installation service and inspection.
  • Page 21 PRE-INSTALLATION 350 mm 570 mm 130 mm Min 500 mm 300 mm Flat roof 6720643895-12.1Wo 6 720 643 895b (2011/08)
  • Page 22 PRE-INSTALLATION FLUE TERMINAL POSITIONS All measurements in millimetres Dormer Window 1,500 Velux Window Drainpipe 1,200 1,500 Boundary Window 6720643895-13.2Wo Fig. 19 Flue terminal positions NOTICE: B All measurements are the minimum clearances required. B Terminals must be positioned so to avoid combustion products entering the building. B Support the flue at approximately one metre intervals and at a change of direction, use suitable brackets and fittings (Flue brackets 100mm x 6 part number: 7 716 191 173, Flue bracket 125mm part number :7 716 191 174).
  • Page 23 PRE-INSTALLATION 3.10 PLUME MANAGEMENT TERMINAL POSITIONS All measurements in millimetres ±45° Plume management deflector: Flue Exhaust Outlet 180° Air Intake ±80° 1,200 Balcony Window Window Window Door Boundary 6720643895-14.1Wo Drainpipe Fig. 20 Plume terminal positions NOTICE: B Maximum effective plume management length = 4,500mm. B Additional 90°...
  • Page 24 INSTALLATION INSTALLATION IMPORTANT HANDLING INSTRUCTIONS: WARNING: All the previous “Pre- • It is advised that two people are used to carry the Installation” sections must be read and the carton from the van to the point of delivery. requirements met before starting boiler or flue installation.
  • Page 25 INSTALLATION WALL MOUNTING TEMPLATE & FLUE OPENING WARNING: BEFORE DRILLING ENSURE THAT THERE ARE NO PIPES, ELECTRICAL CABLES, DAMP PROOF COURSES OR OTHER HAZARDS . SAFETY: All relevant safety precautions must be undertaken. Protective clothing, footwear, gloves and safety goggles must be worn as appropriate.
  • Page 26 INSTALLATION UNPACKING THE APPLIANCE 1. Outer carton 2. Inner sleeve (unwrap from front) 3. Packing base 4. Protective wrapping 5. Appliance outer case B Remove outer carton (1) and place safely away from the working area. B With the outer packaging removed and the inner sleeve (2) still in place gently lay the boiler on its back.
  • Page 27 INSTALLATION BOILER CONNECTIONS PREPARING THE WALLFRAME CAUTION: ISOLATE THE MAINS GAS If using the optional filling loop: 7 716 192 281 (not SUPPLY BEFORE STARTING ANY WORK supplied with the boiler) fit it before hanging the boiler AND OBSERVE ALL RELEVANT SAFETY on the wall frame.
  • Page 28 INSTALLATION HANGING THE BOILER B Remove the screw from the control panel retaining bracket and lower the control panel into the service CAUTION: Hanging the boiler position. B Remove the plastic strip fitted to pipes B Make connections to the heating system. before hanging the boiler.
  • Page 29 INSTALLATION FLUE INSTALLATION Extend tube (1) by withdrawing from tube (2) to achieve the flue length required, between 350 - 570mm. HORIZONTAL FLUE (60/100mm diameter) Secure with the screws provided and seal joint with the For vertical flues and 80/125mm horizontal flues, please aluminium tape supplied.
  • Page 30 INSTALLATION 4.5.3 INSTALLING THE TELESCOPIC FLUE: Refer to figure 38. B If fitting the outer seal from outside the building, slide the outer wall seal onto the terminal as shown. 1. Set the flue length to the distance required, secure with screws provided.
  • Page 31 INSTALLATION 4.5.4 FLUE TERMINAL PLUME RE-DIRECTION: NOTICE: Outlet position The flue discharge can be re-directed allowing some B The flue terminal outlet position must plume redirection control, alternatively, a complete follow those stated in the relevant plume management system can be fitted to the flue appliance instruction manual.
  • Page 32 INSTALLATION CONDENSATE CONNECTION Never terminate or discharge into any open source, 1. Push the syphon onto the sump assembly, until the including; sink, bath, shower, bidet, toilet etc. lug on the sump is fully engaged with the slot on the back of the syphon assembly and the clip is engaged in the top of the syphon.
  • Page 33 INSTALLATION ELECTRICAL Refer to figure 49. CAUTION: ISOLATE THE MAINS 1. Unscrew the three screws in the control panel. ELECTRICITY SUPPLY BEFORE STARTING 2. Remove the connections cover. ANY WORK AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS. The boiler is pre-wired with a mains supply cable.
  • Page 34 INSTALLATION NEW COMPLETE SYSTEM INSTALLATIONS INTEGRATED TIMER AND TWO ZONES If a new complete heating system is installed in a new build property or it is a first time installation in an Zone 1 existing property, the heating systems must conform to Zone Valve current building regulations Part L1a.
  • Page 35 INSTALLATION EXISTING INSTALLATIONS PROGRAMMABLE THERMOSTAT For boiler replacements on an existing system, it is not The programmable thermostat may be a necessary to zone the upstairs and downstairs hard wired or RF type. seperately, compliance with the zone requirements can This diagram is applicable for the hard wired be achieved by a single room thermostat or unit and the receiver section of the RF pack.
  • Page 36 COMMISSIONING COMMISSIONING CONVERTING TO LOW NOx NOTICE: Low NOx ST10 B The Low NOx performance is achieved by changing the code plug. No adjustments need to be made. The boiler can be converted to a “Low NOx” version. ST15 The “Low NOx” specifications can be found in the Technical Data on page 7.
  • Page 37 COMMISSIONING PRE-COMMISSIONING CHECKS B Turn on the main gas supply, check the gas pipe work, connections and rectify any leaks. CAUTION: ISOLATE THE MAINS B Check that the discharge hose(1) has been connected ELECTRICITY SUPPLY BEFORE STARTING to the syphon and condensate outlet pipe. ANY WORK AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS.
  • Page 38 COMMISSIONING FILLING THE SYSTEM WATER TREATMENT 1. Turn on the water main and open the system valves. NOTICE: 2. Open all radiator valves. B ARTIFICIALLY SOFTENED WATER MUST 3. Fill the system via a WRAS approved filling loop to 1 NOT BE USED TO FILL THE CENTRAL HEATING SYSTEM.
  • Page 39 COMMISSIONING STARTING THE APPLIANCE CAUTION: RUNNING THE APPLIANCE B Never run the appliance when the appliance/system is empty or partially filled. Fig. 65 Control panel Switching the appliance on/off: Turn the boiler CH temperature control (1) to maximum. The burner on indicator (2) illuminates GREEN when the B Turn on mains power supply, the power on indicator burner has lit.
  • Page 40 COMMISSIONING COMMISSIONING Ensure inlet pressure is satisfactory with all NOTICE: The combustion settings on this other gas appliances working. gas-fired boiler have been checked, adjusted and preset at the factory for operation on the gas type defined on the data plate. GAS PRESSURE WITHIN THE SYSTEM No measurement of the combustion values is necessary provided there is a meter installed...
  • Page 41 COMMISSIONING 5.6.2 CHECKING THE GAS RATE B The gas rate should be measured at the gas meter after 10 minutes operation at maximum. See technical data section at the front of this manual. B Where a gas meter is not available (e.g. L.P.G.) the CO/CO must be checked to the units shown in the setting of the air/gas ratio, refer to section 6.6.
  • Page 42 COMMISSIONING FINISHING COMMISSIONING 5.7.1 REPLACE OUTER CASING: 5.7.3 INSTALLING THE BOTTOM PANEL B Replace outer casing making sure that the securing B The bottom panel slides onto two ledges (C) either points are properly located. side of the boiler frame. B Replace top two screws (1).
  • Page 43 SERVICE AND SPARES SERVICE AND SPARES INSPECTION AND SERVICE COMPONENT ACCESS 1. Removing outer case CAUTION: TURN OFF THE GAS SUPPLY AND – Remove bottom panel by pushing it fully back and ISOLATE THE MAINS SUPPLIES BEFORE then pulling it forward and down to remove. STARTING ANY WORK AND OBSERVE ALL –...
  • Page 44 SERVICE AND SPARES CHECK THE GAS INLET PRESSURE CHECK THE FLUE INTEGRITY Refer to section 5.6.1 for more information The integrity of the flue system and performance of the boiler can be checked via the flue turret sample points. NOTICE: B Ensure that the gas inlet pressure is Flue gas sample point satisfactory with all other gas appliances...
  • Page 45 SERVICE AND SPARES FAN PRESSURE TEST B Remove the cover and connect a digital manometer to This test is to determine if the heat cell the fan pressure test point. requires cleaning/attention. B After measurement replace test point cover. B The pressure will read negative, refer to the chart in SETTING THE BOILER TO MAXIMUM figure 79.
  • Page 46 SERVICE AND SPARES FLUE GAS ANALYSIS COMBUSTION TEST: Ensure that the gas inlet pressure has been checked and is satisfactory, refer to section 5.6.1 B Connect the flue gas analyser to the flue gas sampling point as shown in the figure below. B Run the boiler at maximum output for at least 10 minutes.
  • Page 47 SERVICE AND SPARES SETTING THE AIR/GAS RATIO B Measure the CO/CO and check against table 28 NOTICE: THE SETTING OF THE GAS RATIO below. MUST BE CARRIED OUT BY A COMPETENT If required set the minimum CO/CO via adjuster (2) PERSON.
  • Page 48 SERVICE AND SPARES CLEANING THE HEAT EXCHANGER B Disconnect spark electrode and flame sensor NOTICE: COMBUSTION TESTING connections. B Combustion testing must be carried out 1. Refer to figure 85 and undo the securing nut on the by a competent person. Testing must not be attempted unless the person carrying top of the heat exchanger and remove the retaining out the combustion check is equipped...
  • Page 49 SERVICE AND SPARES BURNER REMOVAL BAFFLE REMOVAL Refer to figure 87 Refer to figure 88. 1. Remove clamping plate. 1. Remove top baffle. 2. Remove spark/flame electrode assembly and seal 2. Remove lower baffle. from the top of the heat exchanger. If the lower baffle is stuck, it may be 3.
  • Page 50 SERVICE AND SPARES ACCESS COVER REMOVAL THE HEAT EXCHANGER DOES NOT HAVE TO BE REMOVED TO CLEAN. Refer to figure 89. The heat exchanger is shown removed from 1. Remove the two pozi-drive screws the boiler to illustrate cleaning more clearly. 2.
  • Page 51 SERVICE AND SPARES REPLACEMENT OF PARTS CAUTION: TURN OFF THE GAS SUPPLY To gain access to the following components AND ISOLATE THE MAINS SUPPLIES the outer case has to be removed: BEFORE STARTING ANY WORK AND B Primary sensor OBSERVE ALL RELEVANT SAFETY B Overheat thermostat PRECAUTIONS.
  • Page 52 SERVICE AND SPARES 6.8.4 FLUE OVERHEAT THERMOSTAT 6.8.5 MOVING CONTROLS TO SERVICE POSITION (WITH GROMMET) To remove the following components To remove and replace the thermostat either: require the control box must be moved in to B Using a small terminal screwdriver, prise the the service position: thermostat and grommet from the plastic housing.
  • Page 53 SERVICE AND SPARES 6.8.6 GAS VALVE 6.8.7 AIR/GAS MANIFOLD AND FAN ASSEMBLY Refer to figure 96 The following components require the B Isolate gas supply at boiler gas cock. air/gas manifold and fan assembly to be 1. Remove wire clip from the gas valve outlet. removed: 2.
  • Page 54 SERVICE AND SPARES B Rotate fan and air/gas manifold assembly (1.) around the top of the heat exchanger until the lug on the air/ gas manifold is visible. 6720643895-63.1Wo 6720643895-81.1Wo Fig. 99 Rotate the air/gas manifold assembly Fig. 100 Dismantling the air/gas manifold assembly B Lift up assembly and remove from boiler.
  • Page 55 SERVICE AND SPARES 6.8.9 ELECTRODE ASSEMBLY AND BURNER 6.8.10 HEAT EXCHANGER Refer to figure 102. B Isolate flow and return valves then drain the boiler. B Disconnect spark electrodes and flame sensor B Remove syphon. connection. B Remove the air/gas manifold and fan. B Remove clamping plate.
  • Page 56 SERVICE AND SPARES Refer to figure 105. 1. Release the clip. 2. Move the lower exhaust connector up B Remove the complete exhaust assembly. Fig. 107 Heat exchanger removal B Reassemble and check combustion as stated in the Fig. 105 Release lower exhaust connection gas conversion section.
  • Page 57 SERVICE AND SPARES 6.8.11 ACCESS TO BOILER CONTROL COMPONENTS 6.8.13 TRANSFORMER/PCB 1. Remove three screws. Refer to figure 111. 2. Remove cover from control. B Disconnect all electrical connections from the control. 1. Remove five screws retaining the rear panel of the control.
  • Page 58 SERVICE AND SPARES 6.8.14 REPLACING CONTROLS Refer to figure 114. NOTICE: 1. Using a suitable tool, press the button upwards. B Do not replace the control unit if a 2. Slide the control support bracket to the left. CO/CO analyser is NOT available. The control unit is supplied within its plastic housing.
  • Page 59 SERVICE AND SPARES 6.8.15 SYPHON REMOVAL 6.8.16 DIVERTER VALVE MOTOR B Connect electrical power to the appliance. Removal of the syphon assembly will give B Enter the service mode to ensure that the diverter access to the Auto Air Vent. valve is in the mid position (there is no need to drain the appliance).
  • Page 60 SERVICE AND SPARES 6.8.18 AUTO AIR VENT 6.8.19 DHW TEMPERATURE SENSOR (NTC) B Ensure the domestic hot water circuit is fully drained. Removal of the syphon assembly will give B Disconnect the electrical connection from the sensor. access to Auto air vent. Refer to page 59. 1.
  • Page 61 SERVICE AND SPARES 6.8.21 FLOW SENSOR, FLOW RESTRICTOR HOUSING 6.8.23 DRAIN TAP AND FILTER B Ensure the appliance has been fully drained. B Ensure the domestic hot water circuit is fully drained. 1. Rotate the drain tap fully anticlockwise and push in. B Disconnect the electrical connection to the turbine.
  • Page 62 SERVICE AND SPARES 6.8.25 HYDRAULIC BLOCK REMOVAL B Take care not to snag the harness. Remove the syphon assembly. Refer to Syphon assembly removal page 59 B Ensure the appliance has been fully drained. B Disconnect the electrical connections to the NTC sensor, turbine and pump.
  • Page 63 SERVICE AND SPARES 6.8.27 DHW PRESSURE RELIEF VALVE 6.8.28 DHW PLATE HEAT EXCHANGER Remove the Hydraulic block from the boiler NOTICE: DEVICE REMOVAL (See section 6.8.25 removing the Hydraulic B If the hydraulic block has already been Block). removed from the appliance, steps 3 and 4 are all that is required to remove the 1.
  • Page 64 SERVICE AND SPARES 6.8.30 EXPANSION VESSEL The expansion vessel can be replaced with the boiler in Expansion vessel replacement (Removing the Boiler) position if there is a side exit flue fitted and a minimum B Isolate electrical supply. clearance of 340mm above the boiler casing. If a vertical B Isolate system and gas connections at the service flue is fitted then a similar clearance to one side of the valves.
  • Page 65 SERVICE AND SPARES SHORT PARTS LIST Burner Gas Valve 8 716 116 067 0 8 716 111 325 0 8 718 120 619 0 GC No. H26 536 GC No. H26 540 GC No. H26 538 Control board Flue overheat Electrodes HT3 Bus enabled thermostat...
  • Page 66 SERVICE AND SPARES Automatic air vent Fusing element set Pressure relief 8 716 106 445 0 8 744 503 010 0 valve Containing fuses: 8 716 106 431 0 3.15 Amp GC No. H09 750 2.5 Amp 1.6 Amp 0.5 Amp Expansion vessel Seals kit Terminal end...
  • Page 67 FAULT FINDING AND DIAGNOSIS FAULT FINDING AND DIAGNOSIS FAULT FINDING This fault finding system assumes that the appliance has been operating normally until the time of failure (i.e. not This fault finding information is for guidance a first installation error). only.
  • Page 68 FAULT FINDING AND DIAGNOSIS Blue light Lockout indication reset button Fault Possible solution/check Slow flash Flashing Ignition lockout B Gas present and at correct pressure? (mostly (reset B Gas valve off, flashes required) – Check that there is 35V d.c. to each solenoid –...
  • Page 69 FAULT FINDING AND DIAGNOSIS 7.1.1 CIRCUIT DIAGRAM FLAME SENSE ELECTRODE OVERHEAT † Fan wiring: STAT SPARK ELECTRODES Live = purple Neutral = brown FLOW TEMP. SENSOR (NTC) VALVE FLUE OVERHEAT STAT SAFETY SOLENOID SAFETY SOLENOID DIVERTER VALVE PUMP DHW TEMP. MAINS SENSOR (NTC) SUPPLY...
  • Page 72 FAULT FINDING AND DIAGNOSIS PROTECTION FUNCTION AUTOMATIC INTERNAL FROST FUNCTION Internal boiler Internal boiler Pump switches off temperature Pump runs temperature after a 3 minute between overrun period rises above 9°C 8°C & 5°C Boiler automatic frost function (monitors internal boiler primary temperature) Central heating Internal boiler...
  • Page 73 NOTES 6 720 643 895b (2011/08)
  • Page 74 Service Record It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed. Service Provider Before completing the appropriate Service Record below, please ensure you have carried out the service as described in the manufacturer’s instructions.
  • Page 75 Failure to install and commission according to the manufacturer’s instructions and complete this Benchmark Commissioning Checklist will invalidate the warranty. This does not affect the customer’s statutory rights. If yes, and if required by the manufacturer, has a water scale reducer been fitted? CONDENSING BOILERS ONLY The condensate drain has been installed in accordance with the manufacturer’s instructions and/or BS5546/BS6798 If the condensate pipe terminates externally has the pipe diameter been increased and weatherproof insulation fitted?
  • Page 76 LITERATURE: 0844 892 9800 TRAINING: 01905 752526 SALES: 01905 752640 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 6 720 643 895b (2011/08)

This manual is also suitable for:

Worcester greenstar 30siWorcester greenstar 25si47-311-8547-311-8847-311-89