A.O. Smith SGE service manual Working principle of the appliance, Topics covered in this chapter

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gis

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2.1Introduction

2.2General working principle of the appliance

Working principle of the appliance

Topics covered in this chapter:

•General working principle of the appliance;

•The appliance's heating cycle;

•Protection for the appliance;

•Safety of the installation;

•Protection for the solar heating system.

The figure shows a cut-away view of the appliance.

In this appliance, the cold water enters the bottom of the tank through the cold water inlet (14). The water is heated by means of a heat exchanger (55) connected to a solar heating system (2.6 "Protection for the solar heating system") and a gas-fired heat exchanger (11). The air required by the latter for combustion is forced into the burner (17) by the fan (18).

The heated tap water leaves the tank through the hot water outlet (2). Once the appliance is completely filled with water, it will constantly be under mains water pressure. As hot water is drawn from the appliance, cold water is immediately added.

The gas is fed to the burner via the gas control (16). The modulated supply of gas and air ensures that the optimum gas/air mixture is always achieved. The special construction of the burner causes the mixture to form a vortex (cyclone effect) before it becomes ignited. This vorticity improves the ignition on the hot surface igniter (20), as well as ensuring optimum combustion efficiency. The special design of the heat exchanger (11) ensures that the flue gases are first led downwards via the combustion chamber, then upwards via the heat exchanger, and downwards again alongside the water in the tank. The flue gases gradually become cooler in the process. Because the cooled flue gases flow alongside the cold water lower down in the tank, they start to condense. This condensation causes latent heat energy to be transferred to the cooler water, thereby increasing the performance of the unit. The condensate yielded by this process is discharged via the siphon (23).

The insulation layer (24) prevents heat loss. The inside of the tank is enamelled to protect against corrosion. The anodes (9) provide extra protection against corrosion.

The appliance has an inspection and cleaning opening (12) for maintenance.

Instruction manual SGE

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Contents Installation User Your installer Trademarks Read this manual carefullyLiability More informationGis Table of contents Troubleshooting Service programMaintenance frequency Status of the applianceWarranty certificate 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 Chapter Target groups Description Overview of this documentGis Introduction General working principle of the appliance Working principle of the applianceTopics covered in this chapter Appliances heating cycle Other settings that govern the control behaviour areWorking principle of the appliance Appliance water temperature protection Gas valve = time = Temperature 45 oC = Minimum tap water temperaturePressure switch Flame probe Protection for the appliance IntroductionPressure switch Appliance water temperature protectionGas valve 4 FanUnvented installation Safety of the installationVented installation Flame probeSafety of the solar heating system Expansion vessel Fluid temperatureExpansion valve Pump of the solar heating systemPackaging InstallationEnvironmental ConditionsAppliance maximum floor load Air humidity and ambient temperatureWater composition Working clearances Dimensions of the appliance Technical specificationsAppliance is supplied without accessories. Check See the tableDime Description SGE Nsion Gas data General and electrical specificationsGas category 3+ G31 37 mbar Installation diagram Water connections, Unvented Cold water side See C in the installation diagram 3.5 Installation diagramHot water side Circulation pipeCondensation drainage Water connections, VentedAir supply and flue Introduction Gas connectionRequirements for flue gas discharge materials This section covers the following subjectsTypes of appliances Concentric connections Following example illustrates how to use the table SpecificationsPractical example of concentric chimney flue Subject Description Parallel connectionsAppliance Diameter Maximum Total length BendAppliance with parallel flue gas discharge material Practical example of parallel chimney flueConnecting communication cable to solar heating system Preparation Connecting the mains voltageSolar heating system Electrical connectionPreparation 11.2Connecting continuous pump Connecting the mains voltageIsolating transformer 11.2 PreparationConnecting an extra on mode switch Tank on Connecting a program-controlled pumpConnecting an extra error signal Alarm OUT Connecting extra head pump Connecting Q/T sensorConnecting pump station modulating pump Connecting the mains powerConnecting solar collector Connecting communication cable Connecting tank sensorConnecting extra head pump Connecting Q/T sensorChecking the supply pressure and burner pressure Procedure to check pressures Gas data Adjusting the pressureFinish off 3.13.4 Finalising Finalising 13.4Conversion to a different gas category Orifice assemblyConversion to a different gas category Burner pressure regulator Blank plate Gas control connectorPage Conversion to a different gas category Filling Filling vented installations Filling the appliance Filling unvented installationsFilling Filling with glycol Flushing with waterGis Draining Draining Draining unvented InstallationsActivate the Menu with Position the cursor in front of OFFDraining solar heating system Draining glycol-filled system Draining vented installationsPosition the cursor in front of OFF Confirm OFF with Gis Control panel Electronic controller ON/OFF switchControls Meaning of iconsPC connection Navigation buttonsControl panel Status of the appliance Operating modes Error conditions Service conditionOperating modes Error conditions Service conditionCollector temperature warning Q/T Sensor warningStarting and running Open 3.5 Installation diagram the manual gas valveStarting the appliance Starting the appliance Appliances heating cycleIcon is activated Message PRE Purge appears Starting and runningIcon is activated Message Ignition appears Shutting down Shut the appliance down for a brief period OFF modeShutting the appliance down for a long period Electrically isolating the applianceShutting down Set the water temperature via Switching on the on modeMain menu Notational convention for menu-related instructionsWeek program Setting water temperature during on modeStarting and stopping the week program Changing the appliances standard week programWeek program setting the switch- off time Week program setting the switch- on timeWeek program setting the water temperature Bring the cursor to SU Confirm withAdding times to a week program Week program setting the program- controlled pumpConfirm with Display shown in the figure will appear Scroll with to Start Operation Confirm withDeleting times from a week program Confirm with Or use to cancelExtra period To delete a period, proceed as followsSetting the switch-off time Setting the switch-on timeSetting the water temperature Setting the program-controlled pumpSetting menu language SettingsSetting day and time Adjustable settingsConfirm the minute setting with Displaying appliance specifications SGETable shows the correct settings Scroll with to Specifications Confirm withSetting the hysteresis Service programDisplaying the error history Appliance Default RangeSetting the service interval Switching the pump on or offSetting legionella prevention Switching legionella prevention on and offSetting the drain-back tank Solar heating system configurationSetting the heating fluid type in the solar heating system Setting the solar limit temperatureSetting the central heating configuration Setting the QT sensor yes/noReading the energy contribution of the solar heating system General errors TroubleshootingDisplayed errors Distinction is made betweenSymptom 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 absentSymptom Cause Solution Remark Troubleshooting table for displayed errors Displayed errors S11 blocking error Code + Description Cause Solution RemarkS12 blocking error S13 blocking errorF01 blocking error Code + Description Cause Solution Remark S18 blocking errorF02 lock out error Fails to work correctly Engineer Pressure switch not Code + Description Cause Solution Remark F03 lock out errorMaintenance 15.2 Preparation for maintenance. If there is ClosingF05 lock out error Code + Description Cause Solution Remark F04 lock out errorNo gas AreaF07 lock out error Code + Description Cause Solution Remark F06 lock out errorF08 lock out error Safety relay EngineerF11 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 applianceTemperature Code + Description Cause Solution Remark E01 blocking errorE03 lock-out error E04 lock-out errorDisplayed warnings Best maintenance frequency can be determined Maintenance frequencyMaintenance, based on the number of burning hours Standard setting is 500 burning hoursMaintenance frequency Introduction Preparation for maintenance Performing maintenanceWait until the fan has stopped. The icon is then dimmed Performing maintenance Descaling and cleaning the tank Water-side maintenance IntroductionChecking the anodes Following steps must be carried out on the water sideGas-side maintenance Introduction Cleaning condensation water dischargeClean the burners Clean the orifices16.1 General warranty Warranty certificate16.2 Tank warranty Collector warranty Conditions for Installation and useWarranty certificate This appendix contains AppendicesMenu structure of the main menu 17.2 Menu structure Heating systemAppendices Menu structure101 Electrical diagram Electrical diagram for the applianceExtra error signal connection Extra on mode switchController 0/I switch Temperature sensor T1 topElectrical diagram, solar heating system Solar system electrical diagram legend 106 Period Week program cardTset Pump Example Period108 109 IndexIndex 0308