A.O. Smith BFM - 120, BFM - 100 manual Conversion to a different gas category

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4Conversion to a different gas category

Caution

The conversion may only by carried out by an authorised installation

	engineer.

	If the appliance must operate on a family of gases (LP gas or natural gas) or
	other gas category than that for which the appliance has been set at the
	factory, the appliance will have be adapted using a special conversion kit.

		Caution
		You must check the supply pressure and burner pressure once the
	conversion is complete.
4.1 Conversion
4.1 Conversion	1.	Isolate (10.3 "Isolating the appliance from the mains") the water heater from
		the power supply.
	2.	Shut off the gas supply.
	3.	Referring to the gas table (3.4.3 "Gas data"), determine whether the pilot
		flame orifice for the intended gas category is different from the one that is
		currently fitted. If so, replace (4.2 "Orifice replacement") it.

		Note
		The current gas category is stated on the type plate.

	4.	Referring to the gas table (3.4.3 "Gas data"), determine whether the main
		orifice for the intended gas category is different from the one that is currently
		fitted. If so, replace (4.2 "Orifice replacement") it.
	5.	Referring to the gas table (3.4.3 "Gas data"), determine whether the use of
		a blank plate or burner pressure regulator is required for the intended gas
		category. If this is different than for the current gas category,
		exchange (4.3 "Replacement of burner pressure regulator or blank plate
		BFM30-50-80-100")it.
	6.	Referring to the gas table (3.4.3 "Gas data"), determine whether the supply
		pressure and burner pressure for the intended gas category correspond with
		those for the current gas category, and adjust (3.11 "Checking the supply
		pressure and burner pressure") these if necessary.

Instruction manual BFM

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Contents Page Page More information Read this manual carefullyTrademarks LiabilityGis Table of contents Electrical diagram TroubleshootingPerforming maintenance Warranty certificateIntroduction About the applianceWhat to do if you smell gas Regulations Maintenance Forms of notation Target groups Symbol Target groupIntroduction Overview of this DocumentChapter Target groups Description Gis Working principle of the appliance General workingPrinciple Appliance Working principle of the appliance Appliances heating cycle Protection for the appliance Protection Description Water temperature protectionPressure switch Flame probe3 T&P valve Safety of the instal- lationUnvented installation Vented installationGis Packaging InstallationAir humidity and ambient temperature Air humidity and ambient temperatureWorking clearances InstallationMaximum floor load Water compositionTechnical specifica- tions Plan and elevation of the appliance Dimensions of the applianceUnit General and electrical specificationsDimens Description BFM100 BFM120 IonLP gas data G30 30 mbar butane Gas dataDescription Unit Natural gas G20 20 mbarInstallation diagram Installation diagramHot water side Water connections, VentedCold water side Recirculation pipeCirculation pipe Water connections, Unvented See C in the installation diagram 3.5 Installation diagramGas connection Circulation pipeAir supply and flue Introduction Installing chimney flue components for BFM 30, 50Subject Description Concentric wall flue terminal BFMConcentric roof flue terminal BFM 30, 50 Installing chimney flue components for BFM 100 C33 concentric roof flue terminal specifications BFM 30, 50Concentric wall flue terminal BFM100 M2000 MDV SCC C13 concentric wall flue terminal specifications BFM 100Concentric roof flue terminal BFM 100 Electrical connection 11 C33 concentric roof flue terminal specifications BFM 100Mains power Fan Alarm Off Connecting the mains powerGas control for BFM 30 through Checking the supply pressure and burner pressureGas control for BFM BFM BFM 30, 50, 80Conversion Conversion to a different gas categoryConversion to a different gas category Orifice replacementPage Conversion to a different gas category Filling Filling Draining Draining Draining unvented installationsDraining vented installations Gis Control thermostat ON/OFF switchControl panel Explanation of iconsControl panel Burner control reset buttonError conditions Status of the applianceOperating modes Status of the appliance Starting and running Starting the applianceAppliances heating cycle Starting and running Shutting the appliance down for a long period Shutting down the appliance for a brief period OFF modeShutting down Isolating the appliance from the mainsShutting down Control thermostat 7.5 Control thermostat TroubleshootingExplosive ignition Troubleshooting general errorsSymptom Cause Solution Remark Gas smell Water leakageSymptom Cause Solution Remark Insufficient hot water Troubleshooting insufficient hot waterTroubleshooting No hot water Cycle Symptom Cause Solution RemarkPage Introduction Preparation for maintenance Performing maintenanceChecking the anodes Descaling and cleaning the tankPerforming maintenance Water-side mainte- nance 12.3.1IMD-0235 R2 Checking the flue baffles Finalising mainte- nance Clean the burnersClean the orifices Gas-side mainte- nance 12.4.1Conditions for Instal- lation and use Warranty certificate13.1 General warranty 13.2 Tank warrantyWarranty certificate Electrical diagram Electrical diagram BFM Electrical DiagramOptional Components Electrical diagram Index Index 0306