A.O. Smith BFM - 100, BFM - 120 manual Working principle of the appliance

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Working principle of the appliance	gis

Cut-away view of the appliance

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		47
18
2	5
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	39	43
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38		44
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14		51
45	52	51
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15

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	50
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				16
	Legend		15. drain valve	IMD-0240 R2
				42. high-limit thermostat
	Only applicable numbers are		16. gas control	43. safety thermostat
	mentioned.		18. fan	44. frost thermostat
	2.	hot water outlet
			21. flame probe	45. control thermostat sensor
	5.	pressure switch
			22. chimney pipe	46. frost thermostat sensor
	8.	combustion chamber
			24. insulation layer	47. air supply
	9.	anode
			36. bar burners/burner tray	49. air restrictor
	10. tank
			38. safety thermostat sensor	50 combustion chamber with
	11. heat exchanger
			39. high-limit thermostat sensor	air distribution plate
	12. inspection and cleaning opening		40. burner control	51. pilot burner
	14. cold water inlet		41. control thermostat	52. spark igniter

12	Instruction manual BFM

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Contents Page Page Read this manual carefully TrademarksLiability More informationGis Table of contents Troubleshooting Performing maintenanceWarranty certificate Electrical diagramIntroduction 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 Water temperature protection Pressure switchFlame probe Protection DescriptionSafety of the instal- lation Unvented installationVented installation 3 T&P valveGis Installation Air humidity and ambient temperatureAir humidity and ambient temperature PackagingInstallation Maximum floor loadWater composition Working clearancesTechnical specifica- tions Dimensions of the appliance Plan and elevation of the applianceGeneral and electrical specifications Dimens DescriptionBFM100 BFM120 Ion UnitGas data Description UnitNatural gas G20 20 mbar LP gas data G30 30 mbar butaneInstallation diagram Installation diagramWater connections, Vented Cold water sideRecirculation pipe Hot water sideSee C in the installation diagram 3.5 Installation diagram Circulation pipe Water connections, UnventedCirculation pipe Gas connectionInstalling chimney flue components for BFM 30, 50 Air supply and flue IntroductionConcentric wall flue terminal BFM Subject DescriptionConcentric roof flue terminal BFM 30, 50 C33 concentric roof flue terminal specifications BFM 30, 50 Installing chimney flue components for BFM 100Concentric wall flue terminal BFM100 C13 concentric wall flue terminal specifications BFM 100 M2000 MDV SCCConcentric roof flue terminal BFM 100 11 C33 concentric roof flue terminal specifications BFM 100 Electrical connectionConnecting the mains power Mains power Fan Alarm OffChecking the supply pressure and burner pressure Gas control for BFM 30 throughGas control for BFM BFM 30, 50, 80 BFMConversion to a different gas category ConversionOrifice replacement Conversion to a different gas categoryPage Conversion to a different gas category Filling Filling Draining Draining unvented installations DrainingDraining vented installations Gis ON/OFF switch Control panelExplanation of icons Control thermostatBurner control reset button Control panelError conditions Status of the applianceOperating modes Status of the appliance Starting and running Starting the applianceAppliances heating cycle Starting and running Shutting down the appliance for a brief period OFF mode Shutting downIsolating the appliance from the mains Shutting the appliance down for a long periodShutting down Troubleshooting Control thermostat 7.5 Control thermostatTroubleshooting general errors Symptom Cause Solution Remark Gas smellWater leakage Explosive ignitionTroubleshooting insufficient hot water Symptom Cause Solution Remark Insufficient hot waterTroubleshooting No hot water Symptom Cause Solution Remark CyclePage Performing maintenance Introduction Preparation for maintenanceDescaling and cleaning the tank Performing maintenanceWater-side mainte- nance 12.3.1 Checking the anodesIMD-0235 R2 Clean the burners Clean the orificesGas-side mainte- nance 12.4.1 Checking the flue baffles Finalising mainte- nanceWarranty certificate 13.1 General warranty13.2 Tank warranty Conditions for Instal- lation and useWarranty certificate Electrical diagram BFM Electrical Diagram Electrical diagramOptional Components Electrical diagram Index 0306 Index