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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 Ð Modulated Control
Minimum 7.5 kW (25,600 Btu/h)
Maximum 23.4 kW (80,000 Btu/h)
To Central Heating Ð Modulated Control\
Auto Range Rated
Minimum 7.5 kW (25,600 Btu/h)
Maximum 23.4 kW (80,000 Btu/h)
THESE INSTRUCTIONS APPLY IN THE UK ONLY
THESE INSTRUCTIONS ARE TO BE LEFT WIT
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Contents 1. Installation Requirements . . . . . . . . . . . . . . . . . . . . . . . . . Page 2 10. Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9 2. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2 11. Installing the Appliance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11 3. Data Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4 12. Commissioning the Applia
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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. The heating system 3 3 The boiler requires 2.76 m /h (97.5 ft /hr) of natural gas with a should be flushed and treated in accordance with the 3 3 3 calorific value of 37.78 MJ/m (1014 Btu/ft ) or 1.07 m /h (37.8 recomme
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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 3 3 kW Btu/h kW Btu/h m bar. in. wg. m /h ft /h NATURAL GAS 7.5 (25,600) 9.60 (32,750) 1.0 0.4 1.01 35.7 23.4 (80,000) 26.05 (88,890) 13.6 5.4 2.76 97.5 PROPANE 7.5 (25,600) 9.60 (32,750) 3.5 1.4 0.39 13.9 23.4 (80,000) 26.05 (88,890) 35.0 14.0 1.07 37.8 Table 2. FLUE DETAILS HORIZONTAL FLUE (Side or Rear) mm inches FLUE DIAMETER 100 3.9 WALL HOLE
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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 with respect to the installation of appliances in rooms containing baths or showers. Where a room sealed appliance is installed in a room containing a bath
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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. cooling but the minimum clearances must be increased to those 5.3 If the terminal is fitted within 850mm of a plastic or painted given below (note the clearances at the front
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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. 7.1 The system must comply with the requirements of BS 6798 7.9 Repeated venting loses water from the system. It is essential and BS 5449. that this water is replaced and the system pressure maintained. 7.2 The appliance must not be operated without the system 7.10 Con
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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. fitting the appliance. 9.12 The head of a loose head shower must not fall closer than 9.2 MAINS COLD WATER
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Green/yellow conjunction with a programmer. 10. Electrical Important: To provide external frost protection the appliance must have the Central Heating Temperature Control Knob set to 10.1 MAINS SUPPLY. supply heating (the appliance may then be left with the central 230 V ~, 50 Hz, 180 watts. heating turned off on the programmer). External Fuse: 3A. Internal Fuses: 2AT HRC(F1), and 1.AF (F2). Connection must be made at X2 terminals RI and CL. For advice 10.2 It must be possible to completely iso
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Fig. 9. Functional flow diagram. Modulating valve X6 Pins 15 & 16 Outputs Inputs FAN N X4 Pin 3 X4 Pin 1 LOW VOLTAGE RL1 ELECTRONICS PUMP (Microcontroller) N X3 Pin 1 X3 Pin 2 Mains RL3 indicator N X5 Pin 3 GAS VALVE F2 1.25AT X5 Pin 1 X5 Pin 2 RL4 ROOM STAT 6 5 FULL SEQUENCE 4 CONTROLLER 3 MAINS 2 PROGRAMMER/CLOCK X2 1 Flame sense Spark Optional links F1 2ATHRC X1 321 L N 10 X6 Pins 8 & 9 Overheat stat X6 Pins 5,6 & 7 Air pressure switch X6 Pins 1 & 2 Flow signal X6 Pins 19 & 20 CH temp. sensor
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222mm Side wall Technical Helpline. Flue components 1. Turret clamping ring. 11. Installing The Appliance 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. In-line 90¡ flue bend from the appliance casing to the outer wall. 7. In-line 45¡ flue bend Extension flue kits, a vertical take-off adapter, 45¡ and 90¡ flu
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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. BS7593:1992. All extension duct dimensions refer to the straight lengths. The socketed ends must not be removed or included in any measurement. Fig. 12. Appliance pipework con
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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 L Flue Gas Reset button Turret clamping Test Point ring 2. If L is within the range 127mm to 350mm then the flue can 4. In the event of L not falling within any of the above ranges it will be necessary to cut the FIRST extension length. The air be telescopically adjusted to the correct length (L+184mm for and flue duct
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11.5 INTERNAL FITTING OF THE DUCT ASSEMBLY The rubber sealing gasket and the clamping ring are available from Fig. 20. Duct and terminal assembly for Worcester Heat Systems. internal fitting of the flue. Measure and cut the ducts as previously described for external fitting (Section 11.4). Fix the ducts to the terminal and fit the rubber sealing gasket and clamp to the terminal. Centralise the gasket and tighten the clamping ring. See Fig. 19. Slide the flue centering ring Flue centring ring Flu
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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. are cut to X Ð 168mm. The minimum length for X is 190mm. See If a facia mounted programmer is to be fitted follow instructions Fig. 22. with the programmer.. Remove the facia bottom panel as described in Section 14.3(c). Connect the mains electrical supply
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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). The appliance automatically modulates to satisfy lower heat loads. Domestic Hot Water and Central Heating Systems. Check that both the mains water supply and central heating systems hav
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12.3 PROGRAMMER Central Heating Any programmer fitted on the appliance should be set up at this Check that all the radiator valves are open. stage following the instructions sent with the programmer. Check that the system is pressurised and set to the required 12.4 APPLIANCE OPERATION pressure as indicated on the gauge. Turn off the gas and electricity supplies to the appliance. Set any Programmer to HEATING & WATER. Undo the two screws and hinge down the facia. Turn on the gas and electricity s
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13. Instructions To The User 14. Inspection And Service 13.1 Tell the user how to operate the appliance and hand over 14.1 SERVICING the Users Instructions leaflet. To ensure continued efficient operation of the appliance it must 13.2 Tell the user what to do if the heating system is not to be be checked and serviced as necessary at regular intervals. The used in frosty weather. frequency of servicing will depend upon the particular 13.3 Tell the user the sealed system set pressure. installation
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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. electrical connections and pull off the sensing tubes. Unscrew the four fixing screws and remove the fan assembly. See Fig. 30. (f) Combustion Chamber Front. Remove the inner casing cov
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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. After the replacement of any components, check from the switch. Remember to note their positions. for gas soun
