Baxi Potterton G.C.No 47 393 23 13 .1 Annual Servicing, Annual Servicing Inspection, Sump

Page 36

Case Front Panel

Fig. 69

Facia Panel Securing

Screws

Inner Door

Fig. 70

Panel

 

Sump

Fig. 71

13.0 Servicing

13 .1 Annual Servicing

1.For reasons of safety and economy, it is recommended that the boiler is serviced annually. Servicing must be performed by a competent person in accordance with B.S. 7967-4.

2.After servicing, complete the relevant Service Interval Record section of the Benchmark Commissioning Checklist at the rear of this publication.

IMPORTANT: During routine servicing, and after any maintenance or change of part of the combustion circuit, the following must be checked:-

•The integrity of the complete flue system and the flue seals.

•The integrity of the boiler combustion circuit and relevant seals as described in Section 13.2.

•The operational gas inlet pressure as described in Section 11.2.1 to 11.2.7 and the gas rate as described in 11.2.8.

•The combustion performance as described in ‘Check the Combustion Performance’ (13.1.4 to 13.1.6 below).

3.Competence to carry out Checking Combustion Performance

B.S. 6798 ‘Specification for Installation & Maintenance of Gas Fired Boilers not exceeding 70kW’ advises that:-

•The person carrying out a combustion measurement should have been assessed as competent in the use of a flue gas analyser and the interpretation of the results.

•The flue gas analyser used should be one meeting the requirements of BS7927 or BS-EN50379-3 and be calibrated in accordance with the analyser manufacturers’ requirements.

•Competence can be demonstrated by satisfactory completion of the CPA1 ACS assessment, which covers the use of electronic portable combustion gas analysers in accordance with BS 7967, Parts 1 to 4.

Check the Combustion Performance (CO/CO2 ratio)

4.Set the boiler to operate at maximum rate as described in Section 15.1.1 to 15.1.6.

5.Remove the plug from the flue sampling point, insert the analyser probe and obtain the CO/CO2 ratio. This must be less than 0.004.

6.If the combustion reading (CO/CO2 ratio) is greater than this, and the integrity of the complete flue system and combustion circuit seals has been verified, and the inlet gas pressure and gas rate are satisfactory either:

• Perform the ‘Annual Servicing - Inspection’ (Section 13.2) & re-check

• Adjust the gas valve (Section 15.0) & re-check

• Replace the gas valve (Section 14.24) & re-check

13.2Annual Servicing - Inspection

1.Ensure that the boiler is cool.

2.Ensure that both the gas and electrical supplies to the boiler are isolated.

3.Slacken the screws securing the facia panel. Lift the outercase panel so that its securing tabs are clear of the facia. Remove the panel, allowing the facia to hinge down (Fig. 69).

4.Remove the screws securing the inner door panel. Lift the panel slightly to disengage it from the studs on top of the case (Fig. 70).

5.Unscrew the sump from the bottom of the condensate trap assembly (Fig. 71) and remove any deposits from the sump and trap. Clean as necessary and replace the sump.

36© Baxi Heating UK Ltd 2011

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Contents Installation & Service Instructions 0086 Installer Notification Guidelines Scheme Members onlyImportant Installation, Commissioning, Service & Repair LegislationCodes of Practice refer to the most recent version Safe Manual Handling GeneralPreparation TechniqueContents Contents of Pack IntroductionDescription General Layout LayoutFrost Protection Mode Appliance OperationPump Protection Technical Data Promax Combi 24, 28Dimensions and Fixings OrientationTap Rail 32.5 mm Condensate Drain 65 mmSystem Details InformationCentral Heating Circuit BypassSystem Filling and Pressurising Fig Expansion Vessel Central Heating onlyPressure Relief Valve Fig Domestic Hot Water Circuit Fig ShowersHard Water Areas Site Requirements LocationAt Least 1.5 7.2 Clearances Figs Site Requirement Ventilation of CompartmentsGas Supply Electrical SupplyCondensate Drain Flue Flue terminal guardEach fitting to aid assembly Flue OptionsHorizontal Flue Systems Horizontal FluesVertical Flues Twin & Vertical Flue Systems120mm Min ApartFlue Accessories Key Accessory Size Code NoTelescopic Internal Flue Kit Twin Flue Duct Adaptor Twin Flue ConnectionAir Duct Connection Flue Duct Connection Boiler Adaptor Flue Dimensions For Roof TerminalsFlue Trim Terminal Guard FigPlume Displacement Plume Displacement Kit FigMetres Ring Adaptor 28/33 Determining Permissible LengthsExample 5121368General Fitting Notes 30mmElbow to allow the flue to be installed as shown 60Ø extension piece. It must be secured using twoUsing a suitable bit e.g mm, drill through Extension and outlet. Secure using two of the screwsInstallation Unpacking & Initial PreparationFlushing After considering the site requirementsFitting The Boiler Fitting the Pressure Relief Discharge Pipe FigCondensate Drain see section Tighten all the connectionsFitting The Flue Wall Thickness WasteFlue Elbow Ensure Elbow is fully Engaged into BoilerInner Flue Support Bracket 25mm Extension Cut EndEnsure Extension is fully engaged into Boiler Adaptor Making The Electrical Connections Preliminary Electrical ChecksTerminal Block Cover Cable Clamp Commissioning Commissioning the BoilerPressure Completion CompletionCase Front Panel Facia Panel Servicing 13 .1 Annual ServicingAnnual Servicing Inspection Case Front Panel Facia Panel Securing Screws10 ±1 Burner Sensing ElectrodeViewing Window Changing Components Igniter FigSpark and Sensing Electrodes Fig Fan Fig Venturi FigInjector Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan CollectorBurner Fig Insulation FigBurner Gasket Extension Piece Central Heating Temperature Sensor NTC Fig Safety Thermostat FigDHW Temperature Sensor NTC Fig Flue/Heat Exchanger Thermostat Sensor FigPump Head Only Fig Pump Complete FigAutomatic Air Vent Fig Pressure Gauge Figs Hall Effect Sensor FigDiverter Valve Motor Unit & Assembly Fig Plate Heat Exchanger FigSelector Switch Fig 14.22 P.C.B. FigThrottle Adjustment Screw Gas Valve FigExpansion Vessel Fig Setting the Gas Valve Setting the Gas Valve CO2 checkFlue Adaptor Test Point Plug Analyser Probe ThrottleIllustrated Wiring Diagram ElectricalShort Parts List Short Parts List306 302Fault Finding Initial Fault Finding ChecksError Codes Error 133 flashing Go to section ‘A’ Turn the selector switch toReset position for 5 seconds Pump runsTurn selector switch to Error 133 flashing Go to section ‘I’Turn Domestic Hot Water Open DHW tap fullyPCB X3 connector terminals 3 Switch terminalFan jammed or faulty winding Replace PCB Replace waterCheck wiring Viewing Window Replace sensor or PCB E28Gas at burner Replace gas valveReplace safety thermostat Replace PCB Is there 230V atReplace sensor Page Page Condensing Boilers only Service Record Brooks House, Coventry Road, Warwick. CV34 4LL
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