Potthof & Co 33kw, 24kw, 28kw manual Fan Fig, Venturi Fig, Injector Fig

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Fig. 83

Burner

Gasket

Venturi

Injector

Cover

Gas Inlet Pipe

Gas Inlet

Fan

Venturi

Injector

Collector

Fig. 82

Fig. 84

When fitting the venturi ensure that the arrow is pointing forward

14.0Changing Components

14.3Fan (Fig. 83)

1.Undo the nut on the gas inlet pipe to the venturi (Fig. 83) and pull the sensing pipe off the fan.

2.Disconnect the electrode leads, noting their position and disconnect the fan electrical plugs.

3.Undo the screws securing the collector to the cover (33 models) or extension piece (24 & 28 models).

4.Remove the collector and fan assembly, being careful to retain the injector in the venturi.

5.Undo the screws securing the fan to the venturi and fit the new fan, replacing the seal if necessary.

6.Examine the burner gasket and replace if necessary.

7.Reassemble in reverse order, ensuring that the injector is in place and the sensing pipe is connected to the fan.

14.4Venturi (Fig. 82)

1.Remove the collector and fan assembly as described in section 14.3.

2.Extract the injector from the venturi.

3.Undo the screws securing the fan to the venturi and the venturi to the collector.

IMPORTANT: When fitting the new venturi, ensure the arrows on it’s base point into the collector (Fig. 84).

4.Examine the seals and burner gasket, replace if necessary.

5.Reassemble in reverse order, ensuring that the injector is in place.

14.5Injector (Fig. 82)

1.Remove the collector and fan assembly as described in section 14.3.

2.Extract and replace the injector and reassemble in reverse order.

© Baxi Heating UK Ltd 2012

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Contents Installation & Service Instructions Benchmark Scheme Natural GasScheme Members only Installer Notification GuidelinesLegislation Important Installation, Commissioning, Service & RepairCodes of Practice refer to the most recent version Technique Safe Manual HandlingGeneral PreparationContents Introduction Contents of PackDescription Circulation Pump Drain Off Point General LayoutLayout Expansion Vessel Automatic Air VentAppliance Operation Central Heating Mode FigDomestic Hot Water Mode Fig Frost Protection ModeGold Combi 24, 28 & 33 HE a Technical DataDimensions and Fixings Bypass System DetailsInformation Central Heating CircuitSystem Filling and Pressurising Fig Safety Pressure Relief Valve FigExpansion Vessel Central Heating only Showers Domestic Hot Water Circuit FigHard Water Areas At least Site RequirementsLocation Clearances FigsElectrical Supply Site RequirementVentilation of Compartments Gas SupplyRun PerPipe run Minimum Fall Per Metre50mm per Minimum Fall500mm min Minimum fall RunLikely flue positions requiring a flue terminal guard Plume Displacement KitFlue Below windows or openings on pitched roofs 2000Total equivalent length = +B+C+2x90Bends Flue OptionsTotal 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 Terminal Guard Fig Flue DimensionsFor Roof Terminals Flue TrimPlume Displacement Kit Fig Plume DisplacementElbow 28/33Determining Permissible Lengths ExampleGeneral Fitting Notes 50mm30mm Extension and outlet. Secure using two of the screws Elbow to allow the flue to be installed as shown60Ø extension piece. It must be secured using two Using a suitable bit e.g mm, drill throughAfter considering the site requirements InstallationUnpacking & Initial Preparation FlushingFitting the Filling Loop Kit Tighten all the connections Fitting the Safety Pressure Relief Discharge Pipe FigFitting The Boiler Condensate Drain see sectionWall Thickness Waste Flue Fitting The FlueWall Thickness Flue Elbow Ensure Elbow is fully engaged into Boiler Adaptor25mm 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 Screw Pump Automatic Air Vent Selector Switch DisplayCommissioning Commissioning the BoilerIt is necessary to set the boiler to ‘Calibration Mode’ Temperature Control Selector Switch DisplayTemperature Control Gas Pressure Test Point Gas Valve Check the Operational Working Gas Inlet PressureSetting the Timer Completion CompletionCase Front Panel Facia Panel 13 .1 Annual Servicing ServicingAnnual Servicing Inspection 10 ±1 Electrode PositionIgniter Fig Changing ComponentsSpark and Sensing Electrodes Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan Collector Fan FigVenturi Fig Injector FigInsulation Fig Burner FigExtension Piece Flue/Heat Exchanger Thermostat Sensor Fig Central Heating Temperature Sensor NTC FigSafety Thermostat Fig DHW Temperature Sensor NTC FigPump Complete Fig Pump Head Only FigAutomatic Air Vent Fig Hall Effect Sensor Fig Pressure Gauge FigsPressure Relief Valve Fig Plate Heat Exchanger Fig Diverter Valve Motor Unit & Assembly Fig14.22 P.C.B. Fig Selector Switch FigExpansion Vessel Fig Gas Valve FigCO2 should be 8.4% ± Reduce CO2 Setting the Gas ValveSetting the Gas Valve CO2 check Flue Adaptor Test Point Plug Analyser ProbeElectrical Illustrated Wiring Diagram315316 311 404419 422 400 415 Short Parts ListShort Parts List 426Initial Fault Finding Checks Fault FindingError Codes Pump runs Error 133 flashingGo to section ‘A’ Turn the selector switch to Reset position for 5 secondsClose DHW tap Error 133 flashing Go to section ‘I’Turn Domestic Hot Water Open DHW tap fullyReplace water PCB X3 connector terminals 3Switch terminal Fan jammed or faulty winding Replace PCBReplace gas valve Check wiring Viewing WindowReplace sensor or PCB E28 Gas at burnerReplace PCB Is there 230V at Replace safety thermostatReplace sensor Pages for Notes Pages for Notes GAS Boiler System Commissioning Checklist Service Record Potterton