A.O. Smith SGE Fluid temperature, Safety of the solar heating system Expansion vessel

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2

2.6.2

Working principle of the appliance	gis

Fluid temperature

The heat exchanger of the solar heating system may be filled with glycol. If the temperature of the heating fluid is too high, a signal is sent to the controller of the solar collector and the pump of the solar collector is switched off. This signal is passed to the controller by temperature sensor S1.

At present, no heating fluids other than glycol are supported. The heating fluid type is set (12.9.2 "Setting the heating fluid type in the solar heating system") during installation.

Temperature protection for solar heating system

Protection	Description

Maximum temperature S1, if solar	The pump of the solar heating system
heating system is filled with	switches off when the temperature of the
glycol:	heating fluid at S1 exceeds the maximum
- S1 > 130°C	value. The solar heating system enters
	error mode. The error is also visible on the
	display of the SGE appliance

2.7Safety of the solar heating system

2.7.1Expansion vessel

The solar heating system must be equipped with an expansion vessel (16). An expansion vessel serves to limit pressure variations in the system. The expansion vessel in the solar heating system can withstand a maximum pressure of 6 bar. The supply pressure to the expansion vessel depends on the static head of the system.

Besides the expansion vessel, the system is protected from overpressure by an expansion valve (2.7.2 "Expansion valve").

2.7.2Expansion valve

The solar heating system is equipped with an expansion valve (23). The expansion valve monitors the pressure in the solar heating system. If the pressure is excessive (> 6 bar), then the valve will open. The hot water can now flow out of the installation. The valve remains open until the unsafe situation has passed, i.e. until the pressure has fallen back below 6 bar.

Note

Because the installation is always under pressure and is not automatically filled, the system will again need to be replenished (5 "Filling").

18	Instruction manual SGE

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Contents Installation User Your installer Liability Read this manual carefullyTrademarks More informationGis Table of contents Maintenance frequency Service programTroubleshooting Status of the appliancePerforming maintenance Warranty certificateAppendices Table of contents Introduction About the applianceWhat to do if you smell gas Regulations Target groups Maintenance Forms of notation Symbol Target groupIntroduction Overview of this document Chapter Target groups DescriptionGis Working principle of the appliance Introduction General working principle of the applianceTopics covered in this chapter Other settings that govern the control behaviour are Appliances heating cycleWorking principle of the appliance Pressure switch Flame probe = time = Temperature 45 oC = Minimum tap water temperatureAppliance water temperature protection Gas valve Protection for the appliance IntroductionGas valve Appliance water temperature protectionPressure switch 4 FanVented installation Safety of the installationUnvented installation Flame probeExpansion valve Fluid temperatureSafety of the solar heating system Expansion vessel Pump of the solar heating systemEnvironmental InstallationPackaging ConditionsAir humidity and ambient temperature Appliance maximum floor loadWater composition Working clearances Appliance is supplied without accessories. Check Technical specificationsDimensions of the appliance See the tableDime Description SGE Nsion General and electrical specifications Gas dataGas category 3+ G31 37 mbar Installation diagram Hot water side See C in the installation diagram 3.5 Installation diagramWater connections, Unvented Cold water side Circulation pipeWater connections, Vented Condensation drainageRequirements for flue gas discharge materials Gas connectionAir supply and flue Introduction This section covers the following subjectsTypes of appliances Concentric connections Specifications Following example illustrates how to use the tablePractical example of concentric chimney flue Appliance Diameter Maximum Parallel connectionsSubject Description Total length BendPractical example of parallel chimney flue Appliance with parallel flue gas discharge materialSolar heating system Preparation Connecting the mains voltageConnecting communication cable to solar heating system Electrical connection11.2 PreparationIsolating transformer Connecting the mains voltageConnecting continuous pump 11.2 PreparationConnecting an extra error signal Alarm OUT Connecting a program-controlled pumpConnecting an extra on mode switch Tank on Connecting extra head pump Connecting Q/T sensorConnecting the mains power Connecting pump station modulating pumpConnecting solar collector Connecting extra head pump Connecting tank sensorConnecting communication cable Connecting Q/T sensorChecking the supply pressure and burner pressure Procedure to check pressures Adjusting the pressure Gas dataFinish off 3.13.4 Finalising 13.4 FinalisingOrifice assembly Conversion to a different gas categoryBurner pressure regulator Blank plate Gas control connector Conversion to a different gas categoryPage Conversion to a different gas category Filling Filling the appliance Filling unvented installations Filling vented installationsFilling Flushing with water Filling with glycolGis Draining Activate the Menu with Draining unvented InstallationsDraining Position the cursor in front of OFFDraining vented installations Draining solar heating system Draining glycol-filled systemPosition the cursor in front of OFF Confirm OFF with Gis Controls Electronic controller ON/OFF switchControl panel Meaning of iconsNavigation buttons PC connectionControl panel Operating modes Error conditions Service condition Status of the applianceOperating modes Collector temperature warning Service conditionError conditions Q/T Sensor warningStarting the appliance Open 3.5 Installation diagram the manual gas valveStarting and running Starting the appliance Appliances heating cycleStarting and running Icon is activated Message PRE Purge appearsIcon is activated Message Ignition appears Shutting the appliance down for a long period Shut the appliance down for a brief period OFF modeShutting down Electrically isolating the applianceShutting down Main menu Switching on the on modeSet the water temperature via Notational convention for menu-related instructionsStarting and stopping the week program Setting water temperature during on modeWeek program Changing the appliances standard week programWeek program setting the water temperature Week program setting the switch- on timeWeek program setting the switch- off time Bring the cursor to SU Confirm withConfirm with Display shown in the figure will appear Week program setting the program- controlled pumpAdding times to a week program Scroll with to Start Operation Confirm withExtra period Confirm with Or use to cancelDeleting times from a week program To delete a period, proceed as followsSetting the water temperature Setting the switch-on timeSetting the switch-off time Setting the program-controlled pumpSetting day and time SettingsSetting menu language Adjustable settingsTable shows the correct settings Displaying appliance specifications SGEConfirm the minute setting with Scroll with to Specifications Confirm withDisplaying the error history Service programSetting the hysteresis Appliance Default RangeSetting legionella prevention Switching the pump on or offSetting the service interval Switching legionella prevention on and offSetting the heating fluid type in the solar heating system Solar heating system configurationSetting the drain-back tank Setting the solar limit temperatureSetting the QT sensor yes/no Setting the central heating configurationReading the energy contribution of the solar heating system Displayed errors TroubleshootingGeneral errors Distinction is made betweenDisplay is off Troubleshooting table for general errorsSymptom Cause Solution Remark Gas smell Start the appliance up 9 Starting and runningHot water supply Symptom Cause Solution Remark Water leakageExplosive ignition Insufficient or absentSymptom Cause Solution Remark Troubleshooting table for displayed errors Displayed errors S12 blocking error Code + Description Cause Solution RemarkS11 blocking error S13 blocking errorCode + Description Cause Solution Remark S18 blocking error F01 blocking errorF02 lock out error Maintenance 15.2 Preparation for maintenance. If there is Code + Description Cause Solution Remark F03 lock out errorFails to work correctly Engineer Pressure switch not ClosingNo gas Code + Description Cause Solution Remark F04 lock out errorF05 lock out error AreaF08 lock out error Code + Description Cause Solution Remark F06 lock out errorF07 lock out error Safety relay EngineerCode + Description Cause Solution Remark F10 lock out error F11 blocking errorC04 blocking error Code + Description Cause Solution Remark C02 lock out errorC03 blocking error Selected applianceE03 lock-out error Code + Description Cause Solution Remark E01 blocking errorTemperature E04 lock-out errorDisplayed warnings Maintenance, based on the number of burning hours Maintenance frequencyBest maintenance frequency can be determined Standard setting is 500 burning hoursMaintenance frequency Performing maintenance Introduction Preparation for maintenanceWait until the fan has stopped. The icon is then dimmed Performing maintenance Checking the anodes Water-side maintenance IntroductionDescaling and cleaning the tank Following steps must be carried out on the water sideClean the burners Cleaning condensation water dischargeGas-side maintenance Introduction Clean the orifices16.2 Tank warranty Warranty certificate16.1 General warranty Collector warranty Conditions for Installation and useWarranty certificate Menu structure of the main menu 17.2 Menu structure AppendicesThis appendix contains Heating systemMenu structure Appendices101 Electrical diagram for the appliance Electrical diagramController 0/I switch Extra on mode switchExtra error signal connection Temperature sensor T1 topElectrical diagram, solar heating system Solar system electrical diagram legend 106 Tset Pump Week program cardPeriod Example Period108 Index 1090308 Index