Potthof & Co 33kw, 24kw, 28kw manual 13 .1 Annual Servicing, Annual Servicing Inspection

Page 40

13.0 Servicing

Case Front Panel

Fig. 73

Facia Panel Securing

Screws

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

Inner Door

 

13.2

Annual Servicing - Inspection

Fig. 74

 

 

Panel

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. 73).

 

 

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. 74).

 

 

 

Sump

 

 

 

5. Unscrew the sump from the bottom of the condensate trap

 

 

assembly (Fig. 75) and remove any deposits from the sump and

 

 

trap. Clean as necessary and replace the sump.

 

 

Fig. 75

 

40© Baxi Heating UK Ltd 2012

Page 39 Page 41
Image 40
Page 39 Page 41
Contents Installation & Service Instructions Natural Gas Benchmark SchemeInstaller Notification Guidelines Scheme Members onlyLegislation Important Installation, Commissioning, Service & RepairCodes of Practice refer to the most recent version Safe Manual Handling GeneralPreparation TechniqueContents Introduction Contents of PackDescription General Layout LayoutExpansion Vessel Automatic Air Vent Circulation Pump Drain Off PointCentral Heating Mode Fig Domestic Hot Water Mode FigFrost Protection Mode Appliance OperationTechnical Data Gold Combi 24, 28 & 33 HE aDimensions and Fixings System Details InformationCentral Heating Circuit BypassSystem Filling and Pressurising Fig Safety Pressure Relief Valve FigExpansion Vessel Central Heating only Showers Domestic Hot Water Circuit FigHard Water Areas Site Requirements LocationClearances Figs At leastSite Requirement Ventilation of CompartmentsGas Supply Electrical SupplyPer Pipe run Minimum FallPer Metre Run50mm per Minimum Fall500mm min Run Minimum fallPlume Displacement Kit FlueBelow windows or openings on pitched roofs 2000 Likely flue positions requiring a flue terminal guardFlue Options Total equivalent length = +B+C+2x90BendsTotal Equivalent Length = +B+C+1x90Bend Key Accessory Size Code No Flue AccessoriesTelescopic Flue inc. elbow Twin Flue Connection Twin Flue Duct AdaptorAir Duct Connection Flue Duct Connection Boiler Adaptor Flue Dimensions For Roof TerminalsFlue Trim Terminal Guard FigPlume Displacement Plume Displacement Kit Fig28/33 Determining Permissible LengthsExample ElbowGeneral Fitting Notes 50mm30mm Elbow 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 Filling Loop Kit Fitting the Safety Pressure Relief Discharge Pipe Fig Fitting The BoilerCondensate Drain see section Tighten all the connectionsFitting The Flue Wall Thickness Flue ElbowEnsure Elbow is fully engaged into Boiler Adaptor Wall Thickness Waste Flue25mm Extension Cut End Inner Flue Support BracketEnsure Extension is fully engaged into Boiler Adaptor Preliminary Electrical Checks Making The Electrical ConnectionsTerminal Block Cover Cable Clamp Selector Switch Display CommissioningCommissioning the Boiler Screw Pump Automatic Air VentTemperature Control Selector Switch Display Temperature Control Gas Pressure Test Point Gas ValveCheck the Operational Working Gas Inlet Pressure It is necessary to set the boiler to ‘Calibration Mode’Setting the Timer Completion CompletionCase Front Panel Facia Panel 13 .1 Annual Servicing ServicingAnnual Servicing Inspection Electrode Position 10 ±1Igniter Fig Changing ComponentsSpark and Sensing Electrodes Fig Fan Fig Venturi FigInjector Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan CollectorInsulation Fig Burner FigExtension Piece Central Heating Temperature Sensor NTC Fig Safety Thermostat FigDHW Temperature Sensor NTC Fig Flue/Heat Exchanger Thermostat Sensor FigPump Complete Fig Pump Head Only FigAutomatic Air Vent Fig Hall Effect Sensor Fig Pressure Gauge FigsPressure Relief Valve Fig Diverter Valve Motor Unit & Assembly Fig Plate Heat Exchanger FigSelector Switch Fig 14.22 P.C.B. FigGas Valve Fig Expansion Vessel FigSetting the Gas Valve Setting the Gas Valve CO2 checkFlue Adaptor Test Point Plug Analyser Probe CO2 should be 8.4% ± Reduce CO2Illustrated Wiring Diagram ElectricalShort Parts List Short Parts List426 315316 311 404419 422 400 415Initial Fault Finding Checks Fault FindingError Codes Error 133 flashing Go to section ‘A’ Turn the selector switch toReset position for 5 seconds Pump runsError 133 flashing Go to section ‘I’ Turn Domestic Hot WaterOpen DHW tap fully Close DHW tapPCB 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 PCB Is there 230V at Replace safety thermostatReplace sensor Pages for Notes Pages for Notes GAS Boiler System Commissioning Checklist Service Record Potterton
Top Page Image Contents