Worcester 14/19CBi Installation And Servicing Instructions
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Worcester 14/19CBi Installation And Servicing Instructions

Wall mounted boilers for central heating and indirect supply of domestic hot water
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9/14CBi, 14/19CBi, 19/24CBi
WALL MOUNTED BOILERS FOR CENTRAL HEATING
AND INDIRECT SUPPLY OF DOMESTIC HOT WATER
INSTALLATION AND

SERVICING INSTRUCTIONS

This appliance is for use with Natural Gas or LPG (Cat II 2H3P).
9/14CBi GC NUMBER 41 311 50 (N.G.)
14/19CBi GC NUMBER 41 311 52 (N.G.)
19/24CBi GC NUMBER 41 311 54 (N.G.)
9/14CBi N.G.
Minimum
9.0 kW
Maximum 14.0 kW
9/14CBi LPG
Minimum
10.0 kW
Maximum 14.0 kW
IMPORTANT: THESE INSTRUCTIONS APPLY IN THE UK ONLY
AND MUST BE LEFT WITH THE USER OR AT THE GAS METER
Read the instructions before starting work - they have been written to make
the installation easier and prevent hold-ups.
Bosch Group
9/14CBi GC NUMBER 41 311 51 (LPG)
14/19CBi GC NUMBER 41 311 53 (LPG)
19/24CBi GC NUMBER 41 311 55 (LPG)
APPLIANCE OUTPUTS
14/19CBi N.G.
Minimum
14.0 kW
Maximum 19.1 kW
14/19CBi LPG
Minimum
14.0 kW
Maximum 19.1 kW
19/24CBi N.G.
Minimum
19.1 kW
Maximum 23.5 kW
19/24CBi LPG
Minimum
19.1 kW
Maximum 23.5 kW

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Summary of Contents for Worcester 14/19CBi

  • Page 1: Servicing Instructions

    This appliance is for use with Natural Gas or LPG (Cat II 2H3P). 9/14CBi GC NUMBER 41 311 50 (N.G.) 9/14CBi GC NUMBER 41 311 51 (LPG) 14/19CBi GC NUMBER 41 311 52 (N.G.) 14/19CBi GC NUMBER 41 311 53 (LPG) 19/24CBi GC NUMBER 41 311 54 (N.G.)

  • Page 2: Table Of Contents

    The Worcester boilers provide a heat output of between 9-14kW the relevant requirements of the Gas Safety Regulations, current (9/14CBi), 14-19kW (14/19CBi) & 19-24kW (19/24 CBi) factory set at IEE Regulations, Building Regulations, Building Standards mid-range and contain a temperature control and all the appropriate (Scotland) and local water bye-laws.
  • Page 3 1.1m (without cutting) to a maximum of 3.35m (19/24CBi) or return pipework prepared for top outlet connection. 4.1m (9/14 and 14/19CBi). Optional 45° and 90° bends are The pipework can be orientated to allow connection from the available with this option. NOTE: When using flue bends the flue bottom by simply unplugging the bayonet style pushfit connec- length is reduced (see Section11.2.8).

  • Page 4: Technical Data

    MAXIMUM LENGTH FLUE ASSEMBLY DIAMETER VERTICAL FLUE MINIMUM LENGTH 1100 MAXIMUM LENGTH 3.35m (19/24CBi) or 4.1m (9/14 and 14/19CBi) NOTE: FOR VERTICAL FLUE REFER TO A SEPARATE LEAFLET FOR INFORMATION Table 3 9/14CBi Table 3 14/19CBi HYDRAULIC RESISTANCE HYDRAULIC RESISTANCE...
  • Page 5 MINIMUM CENTRAL HEATING SYSTEM SET PRESSURE (Sealed System) 0.12 bar OUTPUT TO CENTRAL HEATING 9/14CBi 9.0 - 14.0kw 14/19CBi 14.0 - 19.05kw 19/24CBi 19.05 - 23.45kw NOx CLASSIFICATION FOR CBi APPLIANCES Class 1 SEDBUK NUMBER AND BAND 9/14CBi NG 78.5 D 14/19CBi NG 79.4 D...

  • Page 6: Siting The Appliance

    4. Siting The Appliance Fig. 3. Appliance pipework connections The appliance may be installed in any room subject to the 165mm requirements of the current IEE regulations and, in Scotland, the FLOW relevant electrical provisions of the Building Regulations with RETURN respect to the installation of appliances in rooms containing baths or showers.

  • Page 7: Flue Terminal Positions

    The minimum requirements are: Model Position of vent Air from room Air from outside 19/24CBi High 255cm 128cm 255cm 128cm 14/19CBi High 207cm 104cm 207cm 104cm 9/14CBi High 152cm 76cm 152cm 76cm...

  • Page 8: System

    "dry loft" and mains pressure pumped sealed and open vent systems. The minimum static hot water can be realised. Contact Worcester Heat Systems head is 1.2m and the maximum is 30m. Technical Helpline. 08705 266241.
  • Page 9 For system wiring please refer to Fig. 6. System layout if using Honeywell 'S' plan Fig. 10. and the controls manufacturers details. Feed and Vent Cistern S.H. – Minimum static head 1.2m measured from the highest point in the heating system (top surface of the appliance S.H.

  • Page 10: Gas Supply

    The appliance must be earthed and it must be possible to natural gas (G20), 1.05 m /h propane (G31). completely isolate the appliance. The 14/19CBi appliance requires a maximum of 2.18 m /h of The mains cable must be 0.75mm (24 x 0.2mm) to natural gas (G20), 0.84 m...
  • Page 11 Fig.10. Boiler wiring diagram Polarity of these connections is not important. Air pressure switch white grey brown Overheat Thermostat orange black Spark Flame Electrode Sense Temperature Electrode sensor Gas Valve Control Board blue brown earth Pump Live Pump Neutral Installer Connections Permanent Neutral User control...
  • Page 12 Fig.11 . System wiring diagram System components wired into terminal strip in accordance with component manufacturers instructions System wiring centre Boiler/pump demand from Terminal strip L switched system wiring centre Pump not to be connected to system wiring centre 230V 50Hz (5A Fuse) Common isolator for wiring centre...
  • Page 13 Fig. 12a. Boiler Assembly 9/14CBi Shown set for integrated flue kit 1. Inner case 14. Overheat thermostat 2. J bolts and wing nuts (2) 15. Air pressure switch 3. Combustion chamber cover 16. Flow pipe 4. Burner 17. Return pipe 5.
  • Page 14 Fig. 12b. Boiler Assembly 14/19 and 19/24CBi Shown set for external flue turret kit or vertical flue 1. Inner case 15. Air pressure switch 2. J bolts and wing nuts (2) 16. Flow pipe 3. Combustion chamber cover 17. Return pipe 4.

  • Page 15: Installing The Appliance

    Fig. 13b . Flue and wall plate 11. Installing The Appliance NOTE: READ THIS SECTION FULLY BEFORE COMMENCING THE INSTALLATION To install a boiler with a rear only flue refer to Section 11.1. To install a boiler with a telescopic horizontal flue kit refer to Section 11.2.

  • Page 16: Install The Boiler

    Pull the flue into position so that the holes in the flange line up with those in the case NOTE: The correct rectangular flue restrictor must now be fitted when the boiler is on the wall. 9/14CBi and 14/19CBi 19/24CBi 66 X 62 (Rectangular) 77 X 62 (Rectangular)
  • Page 17 Fig. 15 . Fixing the appliance to the wall mounting plate. 1. Telescopic flue assembly 2. Wall mounting plate 3. Fixing or security screw 4. Leveling feet (2) 5. Restrictor plate with rectangular hole 6. Gasket 7. Flue fixing screws 8.

  • Page 18: Unpacking The Boiler

    The fixing screw hole on the spigot must be pointing to the front. Centre of boiler IMPORTANT: External Turret Restrictors 9/14CBi and 14/19CBi 19/24CBi Ø72mm Ø79mm (viii) The boiler is supplied for flow and return connections at the top. If a bottom connection is required then pull out the clips, remove and invert the pipes.
  • Page 19 If the length needed is greater than 725mm then extension duct 5. Flue spigot fixing holes kit/s will be required - each kit extends the flue by 750mm up to 6. Combustion sensing a maximum of 2.5m (19/24CBi) or 3.0m (9/14 and 14/19CBi). point See table below. 7. Clamping ring 8.
  • Page 20 11.2.6 Telescopic Horizontal Flue Kit up to 11.2.8 Flue Bends 750mm in Length 90° and 45° directional bends are available. A maximum of two 45° or 90° bends may be used in addition to the first bend on The standard flue can be telescopically adjusted to any the flue turret.
  • Page 21 11.2.10 Fitting of the Flue Assembly without access to the Terminal An internal flue fixing kit (WHS part No. 7 716 191 019) is available from Worcester Heat Systems. NOTE: A larger diameter opening (Ø150mm) in the wall is required. Refer to Table 2.
  • Page 22 11.2.12 Installation of Flue onto Boiler Fig.29 . Flue Turret Fixing . Fit the clamping ring around the flue spigot but leave loose. From the inside push the assembly through the wall. Align the flue turret and push fully onto the spigot on the appliance. (ii) Slide the clamping ring into position so that the hole in the spigot lines up with the hole in the ring.

  • Page 23: Commissioning The Appliance

    [PROPANE] at the gas valve inlet pressure test point, the unused in freezing conditions then switch off the gas and required pressure cannot be obtained then contact Worcester electricity and drain the appliance and the system. Heat Systems Service Department.

  • Page 24: Instructions To The User

    8.1 - 8.7 0.002 - 0.005 6.9 - 7.7 0.002 - 0.005 6.6 - 7.5 0.002 - 0.005 5.6 - 6.5 14/19CBi NG 0.002 - 0.005 7.8 - 8.5 0.002 - 0.005 6.3 - 7.0 0.008 - 0.012 7.1 - 7.7 0.008 - 0.012...
  • Page 25 Burner Blade Assembly. Remove the combustion chamber Clean the heat exchanger from top and bottom after covering the cover. Undo the screw at the right hand end of the burner. burner injector. To clean the heat exchanger flueways remove the Carefully pull-off the connections to the spark electrode.

  • Page 26: Replacement Of Parts

    15.3 Draining the Appliance 15. Replacement Of Parts Isolate the appliance. Remove the casing. Refer to Section 14.3. Important: Turn off the gas and electricity supplies and drain, Fit a tube to the drain connection from the system (top connection where necessary, before replacing any components.
  • Page 27 Fig. 34 . Inner Casing - Gas and Electric Controls. 9/14CBi shown. 1. Inner casing 2. J bolts and wing nuts (2) 3. Combustion chamber cover 4. Burner assembly 5. Inner case cover fixing points (4) 6. Base/control fixing point 7.
  • Page 28 Alter the red arrow if a new setting is made. 15.4.1 Gas Valve The adjustment screw must be sealed by a dab of paint to stop NOTE: If the left hand clearance is >50mm then the gas valve unauthorized adjustment. can be replaced with the burner and combustion chamber cover Switch off the appliance, disconnect the pressure gauge and in place by unscrewing the four extended screws at the manifold...
  • Page 29 15.4.5 Control Board 15.4.6 Fan Lower the base plate/control assembly and carefully disconnect Remove the inner casing and combustion chamber cover . the plug-in connector and all the electrical connections. Refer to Remove the fan as described in Section 14.3 Inspection and Fig.
  • Page 30 15.4.7 Air Flow Sensor 15.4.10 Air Pressure Switch Remove the fan as described in 14.3. Unscrew and withdraw, Noting the position of each pressure tube carefully disconnect through the fan outlet, the air flow sensor. Refer to Fig .38 and the tubes and electrical connections from the switch.

  • Page 31: Combustion Chamber Insulation

    15.4.11 Combustion Chamber Insulation The insulation pads are manufactured from a material in Fig. 41. Heat Exchanger Baffles in Position accordance with COSHH. on the Heat Exchanger Remove the casing, inner casing cover and combustion chamber cover. Front Insulation: Unscrew the clamp at the top of the combustion chamber cover to replace insulation.

  • Page 32: Conversion Instructions

    (VII) Fit the new burner blade assembly into the appliance not from Natural Gas to LPG or vice versa. forgetting to re-connect the electrode leads. Only components supplied by Worcester Heat Systems should (VIII) Refit the combustion chamber front and inner case cover. be used.

  • Page 33: Component Parts List

    Injector Burner 3.4mm NG 9/14CBi 8 716 157 116 0 Injector Burner 2.1mm LPG 9/14CBi 8 716 102 407 0 Injector Burner 3.8mm NG 14/19CBi 8 716 103 168 0 Injector Burner 2.5mm LPG 14/19CBi 8 716 103 169 0 E60-476 Injector Burner 4.3mm NG 19/24CBi...

  • Page 34: Operational Flow Diagram

    18. Operational Flow Diagram...

  • Page 35: Fault Finding

    19. Fault Finding NOTE: This fault finding information is for guidance only. Worcester Heat systems cannot be held responsible for costs incurred by persons not deemed to be competent. The electronic control for this boiler incorporates three lights: Boiler demand, flame on and lockout.
  • Page 36 No boiler demand Gain access to the from the heating control board. Is there 230V at connector system. Investigate X1 between pins SL & N? system. Replace control board. NOTE: It is normal to see only a demand light if the boiler is hot and the burner has temporarily shut off.
  • Page 37 Demand light has Is the boiler in a very cold environment failed. Replace control i.e is the primary water board if it is temperature below 5°C? considered a problem. Boiler is running in 'Autofroststat' mode. Is the system fully water pressurised Rectify fault/leak.
  • Page 38 Is the gas supply Rectify gas supply connected and at the problem. correct pressure? Remove boiler casing. Reset and restart TURN OFF GAS SUPPLY. Are the electrodes the boiler. Remove inner casing Repair or replace Can a flame be seen and gap and cover.
  • Page 39 Delivered primary water Check thermister Move control knob to lower temperature always too hot. sensor/heat conductive Replace control board. setting. (Over 85°C) paste. Such a fault is likely to be caused by one or more of the following: Delivered primary water Low gas pressure temperature appears too Partially blocked flue...
  • Page 40 Bosch Group Worcester Heat Systems Limited, Cotswold Way, Warndon, Worcester WR4 9SW. Telephone: (01905) 754624. Fax: (01905) 754619. Technical Helpline (08705) 266241. www.worcester-bosch.co.uk 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.

  • Page 42: Flue System

    Bosch Group VERTICAL BALANCED FLUE SYSTEM INSTALLATION INSTRUCTIONS ROOM SEALED NON-CONDENSING COMBINATION/SYSTEM BOILERS AND WATER HEATERS 47 311 37/38 15SBi 41 311 43/45 47 311 54 24SBi 41 311 44/46 25Si 47 311 49/50 9/14 CBi 41 311 50/51 28Si 47 311 51/52 14/19 CBi 41 311 52/53...
  • Page 43 1. Flue Terminal Position Fig. 1. Terminal Position Pitched Roof The Flue System must be installed in accordance with BS 5440: Part 1 2000 where applicable. When installed the minimum clearance between the terminal and any adjoining vertical walls or obstructions must be at least 500mm.
  • Page 44 Table 2. 24i, 28i, 35CDi II 2.3m Equivalent WR325, WH1 2.6m Length 4m 25Si, 28Si, C1 3.0m 15SBi, 24SBi, 24CDi, 80ic 4.0m 9/14, 14/19CBi 3.0m Equivalent 19/24CBi 2.25 length 2x750mm 28CDi 3.5m 90° = 1.5m bends Highflow 400 Electronic 4.5m...
  • Page 45 Fig. 5. Adaptor 3. Preparation and General Notes Ensure the ducts are correctly located into 3.1. FLUE HEIGHT AND OFFSETS. the socketed joints. Determine the height of the flue system and if offsets are Fixing screws needed for the system to miss ceiling/roof joists and any other obstruction.
  • Page 46 3.8. POSITIONING THE FLUE SYSTEM It may be necessary to deviate from the following method of installation because of site conditions. However, joints must be sealed and fixed as described. Align the centre of the flue spigot with the ceiling and mark the centre position.
  • Page 47 4. Measurement of Ducts 4.1 AIR AND FLUE DUCT LENGTHS - NO OFFSET For a flat roof measure the distance from the appliance top panel to the outside edge of the hole diameter marked on the inside surface of the roof. This is dimension 'E ' Refer to Fig.
  • Page 48 4.2 AIR AND FLUE DUCT LENGTHS - OFFSET WITH VERTICAL 2nd Vertical Section: Measure the distance from centre-line of the horizontal offset ADAPTER (90° or, where applicable, 45° bends) to the outside edge of the hole diameter marked on the 1st Vertical Section: inside surface of the roof.
  • Page 49 4.3 AIR AND FLUE DUCT LENGTHS - OFFSET WITHOUT Vertical Section: VERTICAL ADAPTER (90° or, where applicable, 45° bends) Measure the distance from the centre-line of the horizontal Measure the distance from the centre of the flue spigot on offset to the outside edge of the hole diameter marked on the top of the appliance to the centre line of the vertical sections.
  • Page 50 Fig. 12. Vertical flue system (offset with 45° flue bends) Air inlet flange Weather sealing collar (Secure with screw provided and seal with silicone sealant) 300mm Roof flashing (not supplied) minimum Flat roof Height of terminal assembly 1100mm G = 1100mm - F L = K - G Flue terminal assembly (106mm diameter)
  • Page 51 5.5 ASSEMBLY OF DUCTS 5.8 FIX THE FLUE SYSTEM ASSEMBLY TO THE APPLIANCE 5.5.1 AIR DUCTS From inside the building, assemble the flue system starting Check the assembled length of the ducts. Drill two holes at the appliance. refer to Fig. 6, 8, 9 and 10. through the pilot holes in the expanded end of the air duct Align the flue assembly or the first section of flue with the and fix the ducts together with the screws provided.
  • Page 52 Important: Do not forget to fix the fire stop spacer as the assembly of the system proceeds. 5.9 FIX THE FLUE TERMINAL ASSEMBLY Fit the roof flashing loosely to the roof. From outside, pass the terminal assembly through the roof flashing.
  • Page 53 Bosch Group Worcester Heat Systems Limited, Cotswold Way, Warndon, Worcester WR4 9SW. Telephone: (01905) 754624. Fax: (01905) 754619. Technical Helpline (0990) 266241. www.worcester-bosch.co.uk 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.

This manual is also suitable for:

9/14cbi19/24cbi

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