Gas Valve Fig, Venturi Inlet Pipe | Baxi Potterton Gold HE A Range

Venturi Inlet

Pipe

14.0 Changing Components

Sensing Pipe

Ignition Lead

Valve

Inlet Pipe

Gas Feed

Elbow

Fig. 103

Retaining Bracket

Outlet Adaptor

Gas Valve

Gas/Air

Adjustment Screw

Fig. 103a

Expansion Vessel

14.23Gas Valve (Fig. 103)

IMPORTANT: After replacing the valve the CO2 must be checked and adjusted as detailed in Section 15.0 Combustion Check. Only change the valve if a suitable calibrated combustion analyser is available.

1.Turn the gas cock off and undo the nut on the gas feed elbow under the boiler.

2.Remove the screws securing the inlet pipe flange to the boiler bottom panel.

3.Pull off the earth lead and sensing pipe.

4.Undo the nut on the venturi inlet pipe and slacken the nut on the venturi. Ease the pipe aside and remove the gas valve.

5.Remove the outlet adaptor and inlet pipe and transfer them to the new valve. Examine the ‘O’ ring seals, replace if necessary.

6.Reassemble in reverse order.

NOTE: To assist the boiler to light prior to final setting, use a suitable hexagon key to wind out the Gas/Air adjustment screw until it is flush with the valve body, then turn the screw 4 full turns clockwise (Fig. 103a). If the boiler will not light, or the correct CO2 cannot be achieved contact the ‘heateam’ technical helpline.

14.24Expansion Vessel (Fig. 104)

1.Drain the primary circuit and undo the nut on the vessel connection pipe.

2.Undo and remove the locknut securing the vessel spigot to the boiler air box.

3.Remove the bracket and vessel from the boiler.

4.Locate the retaining bracket on the upper flange of the vessel and fit to the boiler.

5.Reassemble in reverse order.

Lock Nut

Boiler Chassis

Fig. 104

48© Baxi Heating UK Ltd 2008

Image 48

Baxi Potterton Gold HE A Range manual Gas Valve Fig, Expansion Vessel Fig, Venturi Inlet Pipe

Contents

Installation & Service Instructions Natural Gas BS-EN ISO 9001 Accredited Company Installer Notification Guidelines Scheme Members only Important Installation, Commissioning, Service & Repair LegislationCodes of Practice refer to the most recent version Safe Manual Handling GeneralPreparation Technique Contents Contents of Pack IntroductionDescription General Layout Layout Frost Protection Mode Appliance OperationPump Protection Technical Data Gold Combi 24, 28 & 33 HE a Dimensions and Fixings OrientationFlue Ø 100mm Tap Rail 32.5 mm Condensate Drain 65 mm 22mm 15mm System Details InformationCentral Heating Circuit Bypass System Filling and Pressurising Fig Expansion Vessel Central Heating onlyPressure Relief Valve Fig Domestic Hot Water Circuit Fig ShowersHard Water Areas Site Requirements LocationClearances Figs Site Requirement Ventilation of CompartmentsGas Supply Electrical Supply Condensate Drain Flue Flue terminal guard Flue Options Horizontal FluesHorizontal Flue Systems This bend is equivalent to 1 metre Vertical Flues Twin Pipe Twin & Vertical Flue SystemsMetre for each 91.5 bend Metre for each 135 bend This bend is equivalent to 1 metre Flue Accessories Key Accessory Size Code No5111079 Flue Duct Adaptor Air duct adaptorFor Twin Flue Systems fit the adaptors as follows Flue Dimensions For Roof TerminalsFlue Trim Flue Deflector Fig Plume Displacement Plume Displacement Kit FigMetres Ring Adaptor Additional Accessories Elbow 5121369 Elbow Pair 5121370 28/33Determining Permissible Lengths Example Shown in . Complete the installation of the 60Ø General Fitting Notes30mm Exhaust, securing in the brackets Plume Outlet Elbow Installation Unpacking & Initial PreparationFlushing Loop and valves must be connected as shown in the diagram a Fitting the Filling LoopDouble Check Valve Stop Valve Temporary Filling Loop Hose Fitting Cold Inlet Stop Valve Fitting The Boiler Fitting the Pressure Relief Discharge Pipe FigCondensate Drain see section Tighten all the connections Fitting The Flue Wall Thickness WasteFlue Elbow Ensure Elbow is fully Engaged into Boiler Inner Flue Support Bracket Ensure Flue is fully Engaged into Flue ElbowEnsure Extension is Fully engaged into Boiler Adaptor Making The Electrical Connections Preliminary Electrical ChecksTerminal Block Cover Cable Clamp Selector Switch Display CommissioningCommissioning the Boiler Heat Exchanger Automatic Air Vent Screw Pump Temperature Control Checking Setting the Timer Completion CompletionCase Front Panel Facia Panel Servicing 13 .1 Annual Servicing Annual Servicing BurnerViewing Window Changing Components Igniter FigSpark and Sensing Electrodes Fig Fan Fig Venturi FigInjector Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan Collector Burner Fig Insulation FigExtension Piece Central Heating Temperature Sensor NTC Fig Safety Thermostat FigDHW Temperature Sensor NTC Fig Flue/Heat Exchanger Thermostat Sensor Fig Heat Exchanger Automatic Air Vent Fig Pump Head Only FigPump Complete Fig Automatic Air Vent Fig Pressure Gauge Figs Hall Effect Sensor Fig Diverter Valve Motor Unit & Assembly Figs Plate Heat Exchanger Fig Selector Switch Fig 14.20 P.C.B. FigCompletely undo the screws securing the control box Pin Fig Gas Valve Fig Expansion Vessel FigVenturi Inlet Pipe Temperature Control Selector Switch Display Combustion CheckChecking the CO2 Illustrated Wiring Diagram Electrical Short Parts List Short Parts ListKey Description Manufacturers Fault Finding Initial Fault Finding ChecksError Codes Error 133 flashing Reset position for 5 secondsDisplay illuminates Pump runs Error 110 flashing Domestic Hot Water Follow operational sequenceTurn Domestic Hot Water Open DHW tap fully PCB X3 connector terminals 3 Switch terminalFan jammed or faulty winding Replace PCB Is there 230V at Main terminals L and N Main terminal fuse Gas at burner Replace gas valveTerminals 1 Ensure that the Hall Effect Sensor is in position Replace safety thermostat Replace PCB Is there 230V atReplace heat exchanger GAS Boiler Commissioning Checklist Service Interval Record Brooks House, Coventry Road, Warwick. CV34 4LL UK Comp No 5116282 Iss 7 4/08