Bosch 15SBI Service Manual

Bosch Group15SBi / 24SBiWALL MOUNTED BOILERS FOR CENTRAL HEATINGand Indirect supply of domestic hot waterINSTALLATION ANDSERVICING INSTRUCTIONSThis ap

The 24SBi appliance requires a maximum of 2.86m3/h of naturalgas (G20) or 1.1m3/h of propane (G31). Refer to Table 1.The 15SBi appliance requires a ma

11Fig.13 . Wiring diagram - pictorial.CH SensorFlame SenseElectrodeSpark ElectrodeGas ValveAir FlowSwitchMidPositionValveY Plan(Optional)Facia Mounted

12X11Pin 3X2Pin NPower ON - GreenElectronicsFrost Thermostat (if fitted)Room Thermostat (if fitted)Operating Switchor ProgrammerX2Left TerminalX2Right

Note: READ THIS SECTION FULLY BEFORE COMMENCING THEINSTALLATION11.1 UnpackingCheck the contents against the packing list.Remove the wall mounting temp

Lift the appliance against the wall to engage in the top supportplate and lower onto the manifold assembly. Refer to Fig. 17.Tighten the gas and water

If L>725mm then extension duct kit/s will be required - each kitextends the flue by 750mm up to a maximum of 4m. See tablebelow.EXTENSION MAXIMUM F

If L is between 725 - 1175mm (1 extension)1475 - 1925mm (2 extension)2225 - 2675mm (3 extension)2975 - 3425mm (4 extension)3725 - 4000mm (5 extension)

Replace the inner casing.11.11 Flue Bends.90° and 45° bends are available. A maximum of two bends maybe used in addition to the first bend on the flue

11.12 Vertical Adapter for Horizontal Flues.An adapter is available for an initial short section of vertical flue.Refer to Fig. 30.Measure and cut the

12.1 Lift off the cabinet front panel. .Check that the electricity and gas supplies to the appliance areturned off and that all the water connections

1.1 Gas Safety (Installation & Use) Regulations 1998. It is the law that all gas appliances are installed by a competentperson in accordance with

an extra expansion vessel must be fitted to the system as closeas possible to the appliance in the central heating returnconnection.The appliance [as

13.1 Hand over the User Booklet and explain how to operate theappliance safely and efficiently.13.3 Tell the user what to do if the appliance is not t

22Fig. 41. Inner Casing 15SBi1234567891011121314151. Fan Assembly2. Air Flow Sensing Tubes3. Flue Hood4. Overheat Thermostat5. Combust

231234567891112131. Fan Assembly2. Air Flow Sensing Tubes3. Flue Hood4. Overheat Thermostat5. Combustion Chamber6. Combustion Chambe

15.4.1 Gas ValveDo not remove the inner casing.Unscrew the fixing screw and unplug the connections.Remove the air pressure switch. refer to section 15

15.4.5 Combustion Chamber InsulationRemove the burner and the primary heat exchanger. Refer toSection 15.3.4, 15.4.21.Replace the side and front pads

15.4.9 Control BoardRemove the facia bottom panel and carefully disconnect all theelectrical connections. Refer to Fig. 11 and 12.Lower the facia pane

15.4.13 FanRemove the inner casing.Remove the fan as described in Section 14.3 Inspection andServicing. Ensure that all the connections are correctly

15SBi Burner NG Aeromatic AC23/053591 1 8 716 142 647 015SBi Burner LPG Aeromatic AC23/053592 1 8 716 142 648 085 24SBi Burner NG Aeromatic AC23/05359

29M T W Th F S SuPDAY HR MIN ADVRI AUTO ORUN DHW CHSet8:37

2.7 SystemAll dirt must be flushed from the system before connecting theappliance. Refer to Fig. 5,6 and 7.The system can be pre-piped and flushed bef

3017. Operational Flow DiagramFacia lightONBOILERHEATDEMANDIf HL stat has tripped,4 seconddelayCH onlydemandCH selectedon timer &room calling.In a

3118. Fault FindingNOTE: This fault finding information is for guidance only. Worcester Heat systems cannot be held responsible for costs incurred byp

32Does the boiler pumprun?(removal of pumpventer plug may helpidentify rotation ofpump)Switch off mainssupply.Remove Molexconnector at X6 andmeasure t

33Does the electrodespark at the burner?NoDoes the fan stopafter a fewseconds?NoRemove electricalconnectors from thepressure switch andrestart the boi

34YesAre the sparkelectrodes and gapconnections in good order?NoRepair or replaceelectrodes or leads.YesReplace control board.(Section 15.4.9)Does the

35Set the system toend the boilerdemand.Does the burnershut down?The system is not creatinga demand signal at thecontrol boardIs the system fullyprewi

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

37

The data plate is fixed to the inner casing cover.43. Technical DataMAXIMUM AVAILABLE PUMP HEADBOILER OUTPUT HEAD MIN. FLOW RATE

5GAS SUPPLY SYSTEM - BASED ON NG (G20)TOTAL LENGTH OF GAS SUPPLY PIPE (COPPER) metres3 6 9 12GAS DISCHARGE RATE - PRESSURE DROP m

The appliance may be installed in any room subject to therequirements of the current IEE regulations and, in Scotland, therelevant electrical provisio

The flue system must be installed following the requirements ofBS5440:1.The standard flue kit length is 425 - 725mm. Extension kits forflues up to 4m

7. Sealed SystemThe system must comply with requirements of BS6798 andBS5449.The appliance must not be operated without the system beingfull of water

Fig. 9. Central heating by-pass adjustment 9Filling Loop Filling Key Filling KnobNOTE:Always removethe filling keyafter fillingFig. 8. Filling Loop. F