Manuals / A.O. Smith / Household Appliance / Water Heater

A.O. Smith BFC - 80, BFC -100 service manual Water connections, Unvented

Models: BFC - 80 BFC -100

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3.7Water connections, Unvented

Warning

The installation should be carried out by an authorised installation engineer, in compliance with general and local regulations (1.3 "Regulations").

3.7.1Cold water side

See (A) in the installation diagram (3.5 "Installation diagram").

1.Fit an approved stop valve (4) on the cold water side as required by applicable regulations (1.3 "Regulations").

2.The maximum working pressure of the appliance is 8 bar. Because the pressure in the water pipe at times can exceed 8 bar, you must fit an approved pressure-reducing valve (1).

3.Fit a non-return valve (5) and an expansion vessel (16).

4.Fit an expansion valve (15) and connect the overflow side to an open wastewater pipe.

3.7.2Hot water side

See (B) in the installation diagram (3.5 "Installation diagram").

Note

Insulating long hot water pipes will prevent unnecessary energy loss.

1.Optional: fit a temperature gauge (12) so you can check the temperature of the tap water.

2.Fit the T&P valve (3).

3.Fit a stop valve (11) in the hot water outlet pipe for servicing.

Circulation pipe

See (C) in the installation diagram (3.5 "Installation diagram").

If an immediate flow of hot water is required at draw-off points, a circulation pump can be installed. This improves comfort and reduces water wastage.

1.Fit a circulation pump (6) of the correct capacity for the length and resistance of the circulation system.

2.Fit a non-return valve (5) behind the circulation pump to guarantee the direction of circulation.

3.Fit two stop valves for service purposes (4).

4.Connect the circulation pipe to the cold water supply pipe.

Condensation drainage

1.Fit a sloping wastewater pipe to the siphon (13) for condensation drainage and connect this to the wastewater discharge in the boiler room.

Caution

All fittings behind the siphon must be condensation-resistant.

Instruction manual BFC

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A.O. Smith BFC - 80, BFC -100 service manual Water connections, Unvented

Contents

100 Your installer Trademarks Read this manual carefullyLiability More informationGis Table of contents Troubleshooting Service programMaintenance frequency Performing maintenanceAppendices Table of contents About the appliance IntroductionWhat to do if you smell gas Regulations Symbol Target group Target groups Maintenance Forms of notationIntroduction Document Overview of thisChapter Target groups Description Gis General working principle of the appliance Working principle of the applianceAppliances heating cycle Protection for the appliance Water temperature protection TheGas valveWorking principle of the appliance Pressure switch Water temperature protectionGas valve 4 FanUnvented installation Safety of the installationVented installation Flame probePackaging InstallationEnvironmental ConditionsMaximum floor load Air humidity and ambient temperatureWater composition Working clearancesTechnical specifications Dimensions of the appliance Dimen Description BFC Sion General and electrical specificationsUnit BFC Description II2H3P Unit BFC Natural gas Gas dataInstallation diagram Cold water side Water connections, VentedHot water side Circulation pipeWater connections, Unvented Air supply and flue Introduction Gas connectionRequirements for flue gas discharge materials C43 B23 C33 C13 C53 Practical example of concentric flue gas discharge Concentric connectionsType of appliance Description Appliance Diameter Maximum length Number BendsAppliance with concentric flue gas discharge material SpecificationsSubject Description Concentric wall flue terminal specifications C13Practical example of parallel flue gas discharge Parallel connectionsElectrical connection Preparation Connecting the mains voltagePreparation Isolating transformer Connecting the mains voltage10.2 Preparation Connecting an extra on mode switch Tank on Connecting a program-controlled pumpConnecting an extra error signal Alarm OUT Checking the supply pressure and burner pressure11.1 Procedure to check pressuresGas data Gas data11.3 Adjusting the pressureFinalising Finish off 3.11.4 FinalisingConversion to a different gas category Orifice assemblyStart 9 Starting and running the appliance Conversion to a different gas categoryFilling Installation diagramFilling vented installations Filling unvented installationsFilling the appliance FillingDraining Draining Min Gis Control panel Electronic controller ON/OFF switchControls Meaning of iconsControl panel PC connectionStatus of the appliance Operating modes Error conditions Service conditionOperating modes Manual 13 Troubleshooting Error conditionsStatus of the appliance Menu 11 Main menu chapterManual 14 Maintenance frequency Service conditionGis Starting and running Open 3.5 Installation diagram the manual gas valveAppliances heating cycle Starting and running Appliances heating cycleStarting and running Shutting down Shut the appliance down for a brief period OFF modeElectrically isolating the appliance Shutting the appliance down for a long periodShutting down Setting water temperature during on mode Switching on the on modeMain menu Notational convention for menu-related instructionsStarting and stopping the week program Week program setting the switch- on timeChanging the appliances standard week program Main menuWeek program setting the water temperature Week program setting the switch- off timeWeek program setting the program- controlled pump Adding times to a week programDeleting times from a week program Pump 11.6.4 Week program setting the program-controlled pumpExtra period Setting the switch-on timeProgramming an extra period Setting menu language SettingsDisplaying appliance specifications Setting day and timeRelevant display appears Setting the hysteresis Service programDisplaying the error history Setting the service interval Switching the pump on or offSetting the display contrast Setting the display backlight timeGeneral errors TroubleshootingDisplayed errors Symptom Cause Solution Remark Gas smell Troubleshooting table for general errorsDisplay is off Start the appliance up 9 Starting and runningExplosive ignition Symptom Cause Solution Remark Water leakageHot water supply Insufficient or absentDisplayed errors S13 blocking error Code + Description Cause Solution Remark S12 blocking errorS14 blocking error S15 blocking errorCode + Description Cause Solution Remark F02 lock out error Check the values 2.4.5 Pressure switch Code + Description Cause Solution RemarkReplaced Maintenance 15.2 Preparation for maintenance. If there is Code + Description Cause Solution Remark F03 lock out errorAppliance FlueF05 lock out error Code + Description Cause Solution Remark F04 lock out errorF07 lock out error Code + Description Cause Solution Remark F06 lock out errorF08 lock out error F09 lock out errorF11 blocking error Code + Description Cause Solution Remark F10 lock out errorC03 blocking error Code + Description Cause Solution Remark C02 lock out errorC04 blocking error Selected applianceE03 lock-out error Code + Description Cause Solution Remark E01 blocking errorE04 lock-out error Interval Maintenance frequencyMaintenance frequency Introduction Preparation for maintenance Performing maintenancePerforming maintenance Descaling and cleaning the tank Water-side maintenance IntroductionChecking the anodes Gas-side maintenance Finalizing maintenance Introduction Cleaning condensation water dischargeClean the burners Clean the orifices16.1 General warranty Warranty certificate16.2 Tank warranty Conditions for Installation and useWarranty certificate Week program card AppendicesAppendices BFC Electrical DiagramTerminal Block Connections Appendices Period Week program cardTset Pump Example PeriodPage Index Index 0308