Worcester 24I RSF Installation And Servicing Instructions
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Worcester 24I RSF Installation And Servicing Instructions

Wall mounted combination boiler for central heating and mains fed domestic hot water
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24i RSF
WALL MOUNTED COMBINATION BOILER FOR CENTRAL HEATING
AND MAINS FED DOMESTIC HOT WATER
INSTALLATION AND

SERVICING INSTRUCTIONS

To Domestic Hot Water – Modulated Control
To Central Heating – Modulated Control\
THESE INSTRUCTIONS APPLY IN THE UK ONLY
THESE INSTRUCTIONS ARE TO BE LEFT WITH THE USER OR AT THE GAS METER
This appliance must be installed by a competent person in accordance
with the Gas Safety (Installation and Use) Regulations 1994
Bosch Group
GC NUMBERS
N.G. 47 311 37 L.P.G. 47 311 38
BOILER OUTPUT
Minimum 7.5 kW (25,600 Btu/h)
Maximum 23.4 kW (80,000 Btu/h)
Auto Range Rated
Minimum 7.5 kW (25,600 Btu/h)
Maximum 23.4 kW (80,000 Btu/h)

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  • Page 1: Servicing Instructions

    Bosch Group 24i RSF WALL MOUNTED COMBINATION BOILER FOR CENTRAL HEATING AND MAINS FED DOMESTIC HOT WATER INSTALLATION AND SERVICING INSTRUCTIONS GC NUMBERS N.G. 47 311 37 L.P.G. 47 311 38 BOILER OUTPUT To Domestic Hot Water – Modulated Control Minimum 7.5 kW (25,600 Btu/h)

  • Page 2: Table Of Contents

    1.7 The advice and instructions given in this document covers, as far as possible, the foreseeable situations which may arise. Contact Fixed by-pass Worcester Heat Systems Technical Helpline for advice on specific Domestic installations. Safety hot water discharge Domestic C.H.

  • Page 3: Specifications

    2.5 ELECTRICAL SUPPLY 2.11 SYSTEM NOTES Mains supply: 230V ~, 50 Hz, 180 watts. IMPORTANT External fuse: 3A., Internal fuses: 2AT HRC(F1), and 1 AF (F2). Check that no dirt is left in either the gas or water pipework as 2.6 GAS SUPPLY this could cause damage to the appliance.

  • Page 4: Data Tables

    The data plate is fixed to the inner casing cover. 3. Data Tables Table 1 NOMINAL BOILER RATINGS BURNER SETTING OUTPUT INPUT (Net). GAS RATE PRESSURE Btu/h Btu/h m bar. in. wg. NATURAL GAS (25,600) 9.60 (32,750) 1.01 35.7 23.4 (80,000) 26.05 (88,890)

  • Page 5: Siting The Appliance

    4. Siting The Appliance Fig. 2. Appliance casing dimensions and required clearances. 4.1 The appliance may be installed in any room although particular attention is drawn to the requirements of the current IEE Wiring Regulations BS 7671 and, in Scotland, the electrical 20mm* provisions of the Building Regulations applicable in Scotland, 180mm...

  • Page 6: Siting The Flue

    5. Siting The Flue 6. Air Supply See Fig. 3. 6.1 The appliance does not require a separate vent for 5.1 The flue must be installed as specified in BS 5440:Part 1. combustion air. 5.2 The terminal must not cause an obstruction nor the 6.2 The appliance can be fitted in a cupboard with no vents for discharge cause a nuisance.

  • Page 7: Sealed System

    7.7 The filling point must be at low level. See Fig. 4. 7. Sealed System 7.8 Water loss must be replaced. See Fig 4. The connection should be made in the central heating return as close to the See Figs. 4. appliance as possible.

  • Page 8: Hot Water Supply

    9.10 No anti-syphonage arrangements are necessary except for 9. Hot Water Supply some loose head showers. See also Section 9.11 following. 9.11 Thermostatically controlled or pressure equalising shower 9.1 The following are general requirements and, if necessary, valves will guard against the flow of water at too high a reference should be made to the local Water Company before temperature.

  • Page 9: Electrical

    Connection must be made at X2 terminals RI and CL. For advice 10.2 It must be possible to completely isolate the appliance. on external frost thermostats contact Worcester Heat Systems 10.3 The following connection alternatives must be used: Technical Helpline A 3 amp fused three-pin plug and unswitched shuttered socket 10.11 SAFETY CHECK.
  • Page 10 Fig. 9. Functional flow diagram. Modulating valve X6 Pins 15 & 16 Outputs Inputs X4 Pin 3 X4 Pin 1 LOW VOLTAGE ELECTRONICS PUMP (Microcontroller) X3 Pin 1 X3 Pin 2 Mains indicator X5 Pin 3 GAS VALVE F2 1.25AT X5 Pin 1 X5 Pin 2 ROOM STAT...

  • Page 11: Installing The Appliance

    Technical Helpline. Flue components 11. Installing The Appliance 1. Turret clamping ring. 2. Flue turret assembly 3. Flue terminal assembly The appliance is only suitable for fitting to a sealed system. 4. Extension air duct 11.1 FLUE OPTIONS. 5. Extension flue duct The standard flue length is from 127mm to 350mm measured 6.
  • Page 12 Connect the gas, water and pressure relief valve connections to Measure and cut the extension ducts to length ensuring that the the appliance. The primary system should be flushed and cuts are square and free from burrs. Always check the treated in accordance with the recommendations of dimensions before cutting the ducts.
  • Page 13 Fig. 16. Standard flue assembly. Fig. 18. Flue turret fixing. Flue turret Rear flue L + 181mm Turret Side flue L + 184mm assembly Fixing screw Terminal assembly Appliance casing Reset button Flue Gas Turret clamping Test Point ring 2. If L is within the range 127mm to 350mm then the flue can 4.
  • Page 14 11.5 INTERNAL FITTING OF THE DUCT ASSEMBLY Fig. 20. Duct and terminal assembly for The rubber sealing gasket and the clamping ring are available from Worcester Heat Systems. internal fitting of the flue. Measure and cut the ducts as previously described for external fitting (Section 11.4).
  • Page 15 11.7 VERTICAL ADAPTER 11.8 FINAL INSTALLATION Measure and fit the flue as in Section 11.6 Flue bends except the Check that all the water and gas connections have been first section length is measured from the case top and the ducts tightened.

  • Page 16: Commissioning The Appliance

    12. Commissioning The Appliance Fig. 25. Appliance components and fixings (upper assembly). 12.1 SUMMARY The appliance is dispatched with the controls set to provide a Flue Gas Flue hood Fan assembly maximum output for domestic hot water and central heating of Test Point fixing screws (4) 23.4 kW (80,000 Btu/h).

  • Page 17: Gas Valve View

    If the appliance is being passed over to the user immediately, obtained then Worcester Heat Systems Service Department refer to Section 13 - Instructions to the User and set the controls should be contacted.

  • Page 18: Instructions To The User

    13.4 Tell the user of the importance of regular servicing. generally be adequate. The extent of the service required by the Worcester Heat Systems Ltd. offer a comprehensive maintenance appliance is determined by the operating condition of the contract.
  • Page 19 14.3 DISMANTLE THE APPLIANCE (d) Bottom panel. Unclip and remove the appliance bottom To carry out a full and comprehensive service of the appliance panel. remove the following parts to gain access to the components (e) Fan. Remove the inner casing cover. Carefully unplug the which need to be checked or serviced.

  • Page 20: Replacement Of Parts

    2. Air Pressure Switch. See Fig. 34. 15. Replacement Of Parts Check that the electricity supply to the appliance is turned off. Remove the cabinet front panel as described in Section 14.3 (a) 15.1 IMPORTANT and lower the facia. Section 14.3(c). Switch off the electricity and gas supplies before replacing any Carefully pull off the sensing tubes and the electrical connections components.
  • Page 21 6. Combustion Chamber Insulation. Restart the appliance in central heating mode and adjust the minimum adjustment screw on the gas valve to give a pressure Check that the electricity supply to the appliance is turned off. of 1.0 mbar on natural gas or 3.5 mbar on propane. See Fig. 33. Drain the central heating circuit as described in Section 15.3(a).
  • Page 22 13. Domestic Hot Water Sensor. 16. Pressure Relief Valve. See Fig. 35. Check that the electricity supply to the appliance is turned off. Drain the central heating circuit as described in Section 15.3(a). Hinge the facia assembly in the servicing position as described in Hinge down the facia assembly as described in Section 14.3(c) Section 14.3(c and d).

  • Page 23: Conversion Instructions

    LPG and vice versa. 6. Refit the burner to the appliance and re-assemble the Only components supplied by Worcester Heat Systems inner casing. should be used. 7. Follow the dismantling instructions to remove the gas Only competent persons should attempt the conversion.

  • Page 26: Fault Finding

    18. Fault Finding Modulating valve X6 Pins 15 & 16 Outputs Inputs X4 Pin 3 X4 Pin 1 LOW VOLTAGE ELECTRONICS PUMP (Microcontroller) X3 Pin 1 X3 Pin 2 Mains indicator X5 Pin 3 GAS VALVE F2 1.25AT X5 Pin 1 X5 Pin 2 ROOM STAT FULL SEQUENCE...
  • Page 27 Fault in Fault in Central Heating Domestic Hot Water GO TO Is mains LED flashing? Is mains LED flashing? CHECK D GO TO Is mains LED Is mains LED iluminated? illuminated? CHECK C Turn control knob Is control knob fully clockwise set for demand? Is a room thermostat Ensure link is fitted at...
  • Page 28 No mains LED Is mains present at Connect mains X1 pins 1 & 3? supply Is F1 (2ATHRC) OK? Replace fuse Is F2 (1.25AT) OK? Replace fuse Faulty PCB Replace Flashing mains LED Remove X6 Is resistance between Open circuit Short circuit pins 3 &...
  • Page 29 Overheat Thermostat Check The overheat thermostat can be reset by pressing the reset button, but if it trips immediately or on a regular basis a serious problem has occurred therefore contact your installer Reset thermostat Ensure appliance is Is capillary broken? Does button hold in? cool and retest Is capillary firmly...
  • Page 30 Thermistor Check Remove connectors from thermistor Is resistance between Faulty thermistor terminals of thermistor between 690ohms & 33k Thermistor OK Harness Continuity Check Remove appropriate connectors Is continuity observed Faulty harness between each end of or connector wire in question? Harness OK Harness Short Check Remove appropriate...
  • Page 31 Ignition Check GO TO Is fan running? CHECK G GO TO GO TO Faulty PCB Does sparking occur? CHECK E CHECK L Replace Are ignition leads Is sparking present at Connect ignition leads Does ignition occur? connected both the electrodes? securely ends securely? Ignition coil faulty...
  • Page 32 Air Pressure Switch Check Remove BROWN and WHITE terminals from air pressure switch With no demand, is a short-circuit observed Air pressure switch at exposed APS faulty terminals? Is there mains 230V PCB faulty Reconnect the at fan connector X4 WHITE &...
  • Page 33 Modulating Valve Check Is minimum pressure Remove X6, measure resistance between observed at burner at all pins 15 & 16 times? Is resistance GO TO nominally 125ohms CHECK I Is pressure at burner Faulty modulating valve . With pressure above Reconnect X6 and measure always the same? minimum, remove Modureg...

  • Page 34: Component Parts List

    19. Component Parts List G.C. No. Part Manufacturer’s Reference Part No. E01-579 Burner Assembly Natural Gas Aeromatic AC23/053586 8 716 142 604 0 E01-580 Burner Assembly LPG Aeromatic AC23/053587 8 716 142 611 0 E01-591 Injector Natural Gas Stereomatic O 4.3mm 8 716 140 224 0 E00-741 Injector LPG...
  • Page 36 Bosch Group Worcester Heat Systems Limited, Cotswold Way, Warndon, Worcester WR4 9SW. Telephone: (01905) 754624. Fax: (01905) 754619. Technical Helpline (0990) 266241. This booklet is accurate at the date of printing but will be superseded and should be disregarded if specifications and/or appearances are changed in the interests of continued improvement.

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