A.O. Smith 28 30 50 60 Safety of the instal- lation, Ionisation rod, Unvented installation

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2

2.4.5

2.5Safety of the instal- lation

Functioning of the appliance

gis

 

 

Table 2.2 shows the trip point per appliance.

 

Table 2.2 Pressure switch trip points

 

 

 

 

Applianc

Pressure differential [Pa]

 

e

 

 

Closing

Opening

 

 

 

 

BFC 28

> 635

< 605

 

 

 

BFC 30

> 855

< 825

 

 

 

BFC 50

> 885

< 855

 

 

 

BFC 60

> 1085

< 1055

 

 

 

nRemark

The trip point of the pressure switch is not adjustable.

Ionisation rod

To ensure that no gas will flow when there is no combustion, an ionisation rod has been fitted. The ThermoControl uses this rod for flame detection, by means of ionisation detection. The ThermoControl cuts in, the instant it detects that there is a gas flow but no flame.

In addition to the appliance’s standard safety monitoring, the appliance must also be protected by an expansion vessel, pressure overflow valve, non-return valve and a T&P valve.

Use of an expansion vessel, a pressure relief valve and/or a pressure reducing valve depends on the type of installation: unvented or vented.

2.5.1Unvented installation

With an unvented installation, a pressure relief valve and expansion vessel prevent excessive pressure in the tank. This prevents damage being caused to the enamelled coating (in the appliance) or to the tank. A non-return valve prevents excessive pressure in the water supply system. This valve also prevents water from flowing backwards from the tank into the cold water supply system. The pressure reducing valve protects the installation against an excessively high water supply pressure (> 8 bar). These components are fitted to the cold water pipe. See paragraph ’3.6.1 Cold water side’.

2.5.2Vented installation

With a vented installation, excess pressure is taken up by the open water reservoir. The level of the water reservoir determines the maximum working pressure in the tank, which may not exceed 8 bar. The installation must also be fitted with an overflow from the hot water pipe, which discharges into the water reservoir. See paragraph ’3.6.2 Hot water side’.

2.5.3T&P valve

A T&P valve is only mandatory in an ‘unvented’ installation. However,

A.O. Smith also recommends the use of a T&P valve in ‘vented’ installations.

A T&P valve monitors the pressure in the tank, and the water temperature at the top of the tank. If the pressure in the tank becomes excessive (>10 bar) or the water temperature is too high (>97°C), the valve will open. The hot water will immediately flow out of the tank. Because the appliance is under water supply pressure, cold water will automatically flow into the tank. The valve remains open until the unsafe situation has been averted. A connecting point for a T&P valve is standard on the appliance. See paragraph ’3.6.2 Hot water side’.

16

Instruction Manual BFC

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Contents Release R.1.3 UK Your installer Copyright TrademarksLiability More informationPage Table of contents GisFilling and draining Control panelStatus of the appliance Starting up and shutting downService program TroubleshootingMaintenance frequency MaintenanceAppendices IndexWhat to do if you smell gas Regulations IntroductionAbout the appliance Target groups Maintenance Forms of notation Symbol Target groupRemark IntroductionOverview of this DocumentOverview of this document Chapter Target groups DescriptionGis Introduction Functional description of the appliance Functioning of the applianceIntroduction Pressure switch Ionisation rod Water temperature protection Gas controlAppliance’s heating cycle Protection for the appliance Water temperature protection Pressure switchGas control 3 FanSafety of the instal- lation Unvented installationVented installation Ionisation rodInstallation Introduction Packaging Environmental conditionsHumidity and ambient temperature Maximum floor loadingWater composition Working clearancesEnvironmental conditions Working clearancesTechnical specifications Plan and elevation of the applianceDimensions Technical specificationsDime Description BFC Nsion Unit BFCVAC Installation diagram Gas dataGeneral G30-30 mbar butaneInstallation UnventedWater connections, Unvented Cold water side Hot water sideCirculation pipe Condensation drainageWater connections, Vented Gas connectionSee paragraph ’3.6.4 Condensation drainage’ See din FigureAir supply and flue gas discharge Dimension BFCAir supply and flue gas discharge Specification Description Concentric wall flue terminalConcentric roof flue terminal specifications Concentric roof flue terminalPreparation Electrical connectionPreparation Mains voltage Mains voltage Electrical connectionExtra on mode switch Tank on Isolating TransformerContinuous pump Program-controlled pumpConnecting extra error signal Alarm OUT Checking the supply Pressure and burnerChecking the supply pressure and burner pressure ApplianceMain menu Conversion to a different gas category Conversion to a different gas categoryRemove the burner as complete assembly 13 Conversion of gas control Check the burner and supply pressure see paragraphInstallation Filling the appliance Filling unvented installations Filling vented installationsFilling and draining Filling the applianceInstallation diagrams F d c Filling and drainingDraining unvented installations Draining vented installationsDraining the appliance Draining the applianceGis Control panel Introduction OperatingExplanation of the icons ON/OFF switch of ThermoControl Navigation buttonsPC connection Control panelStatus of the appliance Operating modes Error conditions Service conditionIntroduction Operating modes Error conditions Status of the applianceService condition Service conditionGis Open the gas valve see ’ .1 Installation diagrams’ Starting up and shutting downIntroduction Starting up Shutting downShut the appliance down for a brief period OFF mode Disconnect the appliance from the mainsShut the appliance down for a longer period Starting up and shutting downAppliance’s heating cycle Appliance’s heating cycle12 Ignition Main menu Notational convention for menu-related instructionsSetting the water temperature via Setpoint Menu Switching into on mode Setting the water temperatureSetting water temperature during on mode Starting up and shutting down the week program Week programme IntroductionChanging the appliance’s standard week program Remark Setting switch-off time Setting the switch-on timeExample Setting the water temperature Setting program-controlled pumpAdding times to a week program Week programmeDeleting times from a week program 20 Period added23 week program options Extra period Programming an extra periodSetting menu language SettingsSettings Setting day and time Displaying appliance specifications Remark46 Main menu Gis Setting the hysteresis Service programDisplaying the error history Setting the pump on/off Setting the service intervalService program Displaying the appliance historySetting the display contrast Setting the backlight timeSetting the display scroll speed Setting the display contrastService program General errors TroubleshootingDisplayed errors Troubleshooting table for general errors Symptom Cause Solution Remark Gas smell Gas leakSee appendix ’A.2 Electrical diagram BFC’ Symptom Cause Solution Remark Display is offWater leakage Troubleshooting table for displayed errors Symptom Cause Solution Remark Explosive ignitionInsufficient or no hot WaterS02 blocking error S03 blocking errorS04 blocking error S05 blocking errorS14 blocking error S13 blocking errorS15 blocking error Phase-sensitive. See ’3.10 Electrical connection’ F02 lock out errorAppliance specifications’ How to bleed air from the gas line, and measure the supply F06 lock out error F07 lock out errorF08 lock out error ’3.9 Air supply and flue gas discharge’Error F09 remains active in the event that the water F10 lock out errorRelease R.1.3 UK Release R.1.3 UK C04 blocking error E01 blocking errorE03 blocking error E04 blocking errorMaintenance frequency Determining service intervalMaintenance frequency Maintenance Remark Preparation for maintenanceStarting up Maintenance Descaling and cleaning the tank Cleaning condensation water dischargeCleaning the burner Water-side mainte- nance IntroductionCleaning the orifice Cleaning heat exchanger12.4.3 Remark Finalising mainte- nanceWarranty Certificate Warranty Certificate Appendices Week program cardElectrical diagram AppendicesWeek program card Release R.1.3 UK IX Index Index0306 IX Index
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