Potthof & Co 33kw, 24kw Replace sensor or PCB E28, Gas at burner, Replace gas valve, Terminals 1

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Page 58

E

E20 or E50 - Temperature sensors faulty. Cold resistance approximately

10kí @ 25° C (DHW and CH sensors)

20kí @ 25° C (Flue sensor)

(resistance reduces with increase in temp.)

E28 - Incorrect PCB fitted

18.0 Fault Finding

NO

Replace sensor or PCB (E28)

F

G

1.Check and correct the connection of the tube between the venturi and gas valve

2.	Gas at burner	NO	Ensure gas is on and purged

	PCB - X3 connector is 230V AC across				YES
	PCB - X3 connector is 230V AC across				YES		Replace gas valve
		terminals 1 & 2					Replace gas valve



		NO

		Replace PCB

1.

Ensure that the Hall Effect Sensor is in position.		YES		Check the voltage between red wire and blue
Check the connection between the PCB - X400				wire is more than 5V DC
connector terminals 3,6,7 and the electronic sensor
				NO		YES
				NO		YES

H

Check and correct if necessary

1.Ignition electrode and lead

2.Electrode connection

3.Spark gap and position

Burner

Sensing

YES

Replace PCB

Voltage at PCB - X2 connector is at least 100V DC across terminals 2 & 5 (Note: from multimeter connect ‘common’ to 2 & ‘volts’ to 5).

Check wiring

Viewing Window

NO

YES

Replace Hall

Effect Sensor

Replace PCB

Replace igniter

5 . 0 ±

4

Electrode

			±	1
	.	5	±
7	.	5
7

Spark Ignition

Electrode

10 ±1

Electrode Position

58© Baxi Heating UK Ltd 2012

Image 58

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 Preparation Safe Manual HandlingGeneral TechniqueContents Introduction Contents of PackDescription Expansion Vessel Automatic Air Vent General LayoutLayout Circulation Pump Drain Off PointFrost Protection Mode Central Heating Mode FigDomestic Hot Water Mode Fig Appliance OperationTechnical Data Gold Combi 24, 28 & 33 HE aDimensions and Fixings Central Heating Circuit System DetailsInformation BypassSystem Filling and Pressurising Fig Safety Pressure Relief Valve FigExpansion Vessel Central Heating only Showers Domestic Hot Water Circuit FigHard Water Areas Clearances Figs Site RequirementsLocation At leastGas Supply Site RequirementVentilation of Compartments Electrical SupplyPer Metre PerPipe run Minimum Fall Run50mm per Minimum Fall500mm min Run Minimum fallBelow windows or openings on pitched roofs 2000 Plume Displacement KitFlue 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 Trim Flue DimensionsFor Roof Terminals Terminal Guard FigPlume Displacement Plume Displacement Kit FigExample 28/33Determining Permissible Lengths ElbowGeneral Fitting Notes 50mm30mm Using a suitable bit e.g mm, drill through Elbow to allow the flue to be installed as shown60Ø extension piece. It must be secured using two Extension and outlet. Secure using two of the screwsFlushing InstallationUnpacking & Initial Preparation After considering the site requirementsFitting the Filling Loop Kit Condensate Drain see section Fitting the Safety Pressure Relief Discharge Pipe FigFitting The Boiler Tighten all the connectionsEnsure Elbow is fully engaged into Boiler Adaptor Fitting The FlueWall Thickness Flue Elbow 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 Commissioning the Boiler Selector Switch DisplayCommissioning Screw Pump Automatic Air VentCheck the Operational Working Gas Inlet Pressure Temperature Control Selector Switch DisplayTemperature Control Gas Pressure Test Point Gas Valve 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 Injector Fig Fan FigVenturi Fig Gasket Venturi Injector Cover Gas Inlet Pipe Fan CollectorInsulation Fig Burner FigExtension Piece DHW Temperature Sensor NTC Fig Central Heating Temperature Sensor NTC FigSafety Thermostat 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 FigFlue Adaptor Test Point Plug Analyser Probe Setting the Gas ValveSetting the Gas Valve CO2 check CO2 should be 8.4% ± Reduce CO2Illustrated Wiring Diagram Electrical426 Short Parts ListShort Parts List 315316 311 404419 422 400 415Initial Fault Finding Checks Fault FindingError Codes Reset position for 5 seconds Error 133 flashingGo to section ‘A’ Turn the selector switch to Pump runsOpen DHW tap fully Error 133 flashing Go to section ‘I’Turn Domestic Hot Water Close DHW tapFan jammed or faulty winding Replace PCB PCB X3 connector terminals 3Switch terminal Replace waterGas at burner Check wiring Viewing WindowReplace sensor or PCB E28 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