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
Maximum 23.4 kW (80,000 Btu/h)
To Central Heating – Modulated Control\
Maximum 23.4 kW (80,000 Btu/h)
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 1998
Supplied By www.heating spares.co Tel. 0161 620 6677
GC NUMBERS
N.G. 47 311 37 L.P.G. 47 311 38
BOILER OUTPUT
Minimum 7.5 kW (25,600 Btu/h)
Auto Range Rated
Minimum 7.5 kW (25,600 Btu/h)

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  • Page 1: Servicing Instructions

    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) Maximum 23.4 kW (80,000 Btu/h)

  • Page 2: Table Of Contents

    1.10 The advice and instructions given in this document covers, as supply far as possible, the foreseeable situations which may arise. Contact Worcester Heat Systems Technical Helpline for advice on specific A low thermal capacity Gas to Water heat exchanger incorporating an installations.
  • Page 3 Fully modulating controls in the central heating and domestic hot There is provision for the connection of a mains voltage room water modes of operation. thermostat and/or a frost thermostat. An expansion vessel, pressure gauge and pressure relief valve. The electronic controls prevent rapid cycling of the appliance in the A fixed by-pass for the central heating system.

  • 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 30mm* provisions of the Building Regulations applicable in Scotland, 200mm...

  • 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 Technical Helpline 10.3 The following connection alternatives must be used: 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. 11. Installing The Appliance Mark the centre-lines of the pipe connections to aid the pre- plumbing of the system pipework. Check the position of the fixing points and the flue opening before Note: READ THIS SECTION FULLY BEFORE COMMENCING drilling the fixing holes 60mm deep for the No.12 size plugs and INSTALLATION.
  • Page 12 The standard telescopic flue assembly is suitable for flues Fig. 12. Appliance casing and control from425mm (without cutting) up to 725mm measured from the equipment fixings. centre-line of the boiler flue outlet to the outer face of the wall. Refer to Fig. 14. If L is greater than 725mm then flue extension kits will be required - each kit extends the flue by 750mm up to a maximum of 2500mm.
  • Page 13 (3 extension) 11.11 Fitting of the Flue Assembly without access to the Terminal A rubber gasket kit is available from Worcester Heat Systems. it is necessary to shorten the assembly by cutting the first NOTE: A larger diameter opening in the wall is required. Refer to extension duct assembly i.e.
  • Page 14 Fig. 18. Flue Turret Fixing . Fig. 19. Terminal assembly for internal fitting of the flue. 1. Flue turret 2. Clamp 1. Flue centering ring 4. Rubber sealing gasket 3. Appliance 2. Air duct 5. Flue Terminal 4. Fixing Screw 3.
  • Page 15 Fig. 21 - Elbow to Flue Turret Fig. 23 - Facia Connections Cover. 120mm Assembly. 100mm Flue Turret Bend 1. Control Panel Fixing Screws Fig. 22 Vertical Adapter. 2. Facia 3. Control Panel Pivot Point 4. Connection Cover Flue Duct 5.

  • Page 16: Commissioning The Appliance

    12. Commissioning The Appliance Fig. 27. Appliance components and fixings (upper assembly). Flue Gas Flue hood Fan assembly Benchmark Water Treatment: For optimum performance after Test Point fixing screws (4) installation, this boiler and its associated central heating system should be flushed in accordance with the guidelines given in BS7593:1992 - Treatment of water in domestic hot water systems.

  • Page 17: Appliance Operation

    6°C. obtained then Worcester Heat Systems Service Department should be contacted. Gradually close the hot tap and check that the burner pressure drops.

  • 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. 36. 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. 35. Drain the central heating circuit as described in Section 15.3(a).
  • Page 22 sink compound between the faces. Refit the leads. 16. Pressure Relief Valve. See Fig. 37. 13. Domestic Hot Water Sensor. Drain the central heating circuit as described in Section 15.3(a). Check that the electricity supply to the appliance is turned off. Hinge down the facia assembly as described in Section 14.3(c) Hinge the facia assembly in the servicing position as described in Remove the Bottom panel as described in Section 14.3(d)

  • Page 23: Conversion Instructions

    See Installation Instructions: Section from natural gas to LPG and vice versa. 15.4.11 Replacement of Parts, Component Replacement, Gas Only components supplied by Worcester Heat Systems should Valve. be used. 8. Turn on the gas and electricity supplies and following the Only competent persons should attempt the conversion.

  • Page 24: Operational Flow Diagrams

    Supplied By www.heating spares.co Tel. 0161 620 6677...
  • Page 25 Supplied By www.heating spares.co Tel. 0161 620 6677...

  • 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 Domestic Hot Water Central Heating GO TO Is mains LED flashing? Is mains LED flashing? CHECK D Is mains LED GO TO Is mains LED illuminated? CHECK C iluminated? 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? GO TO...
  • 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 8 716 105 033 0 8 716 140 224 0 E00-741...
  • Page 35 Supplied By www.heating spares.co Tel. 0161 620 6677...
  • Page 36 This manual is to be used in conjunction with the variant part number of the bar code below: Worcester Heat Systems Limited (Bosch Group), Cotswold Way, Warndon, Worcester WR4 9SW. Telephone: (01905) 754624. Fax: (01905) 754619. Technical Helpline 08705 266241.

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