Potthof & Co 24kw, 33kw, 28kw Plate Heat Exchanger Fig, Diverter Valve Motor Unit & Assembly Fig

Page 48

Plate Heat Exchanger

LH Location Stud

Fig. 98

Rubber Seal

Motor Unit

Multi-pin Plug

Retaining Clip

Valve

Assembly

Fig. 99

Pressure Sensor

14.0Changing Components

14.20Plate Heat Exchanger (Fig. 98)

1.Drain the boiler primary circuit and remove the gas valve as described in section 14.23.

2.While supporting the heat exchanger undo the screws securing it to the brass manifolds.

3.Withdraw the heat exchanger upwards, taking care not to damage any wires or controls.

Seals

4.There are four rubber seals between the manifolds and heat exchanger which may need replacement.

5.Ease the seals out of the manifold. Replace carefully, ensuring that when the seal is inserted into the manifold it is parallel and pushed fully in.

6.When fitting the new heat exchanger note that the left hand location stud is offset towards the centre more than the right hand one.

7.Reassemble in reverse order.

14.21Diverter Valve - Motor Unit & Assembly (Fig. 99)

1.To replace the motor unit, disconnect the multi-pin plug.

2.Pull off the retaining clip and remove the motor unit.

3.The motor unit can now be replaced, or the valve assembly removed.

4.Drain the primary circuit and draw off any hot water once the isolating taps are closed.

5.Undo the nuts on the tap rail under the boiler. Remove the screws securing the valve assembly to the boiler bottom panel and plate heat exchanger.

6.Remove the valve assembly. Examine any seals or washers, replacing if necessary. Transfer the DHW NTC to the new valve and reassemble in reverse order.

48© Baxi Heating UK Ltd 2012

Image 48

Contents Installation & Service Instructions Natural Gas Benchmark SchemeInstaller 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 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 BypassSafety Pressure Relief Valve Fig System Filling and Pressurising FigExpansion Vessel Central Heating only Domestic Hot Water Circuit Fig ShowersHard Water Areas Site Requirements LocationClearances Figs At leastSite Requirement Ventilation of CompartmentsGas Supply Electrical SupplyPer Pipe run Minimum FallPer Metre RunMinimum Fall 50mm per500mm 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 Flue Accessories Key Accessory Size Code NoTelescopic Flue inc. elbow 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 Fig28/33 Determining Permissible LengthsExample Elbow50mm General Fitting Notes30mm 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 FlueInner 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 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 Servicing 13 .1 Annual ServicingAnnual Servicing Inspection Electrode Position 10 ±1Changing Components Igniter FigSpark and Sensing Electrodes Fig Fan Fig Venturi FigInjector Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan CollectorBurner Fig Insulation FigExtension 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 FigPressure 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 415Fault Finding Initial Fault Finding ChecksError 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 safety thermostat Replace PCB Is there 230V atReplace sensor Pages for Notes Pages for Notes GAS Boiler System Commissioning Checklist Service Record Potterton