A.O. Smith SGE service manual Starting and running, Icon is activated Message PRE Purge appears

Page 62

	9		Starting and running

The complete cycle is explained in the following example, which assumes the appliance is in the basic mode ON.

Note

The same heating cycle applies to the other operating modes.

Once the appliance starts, it will run through the following steps:

1.The water temperature drops below the set temperature of (for example) 65°C. The electronic controller detects a demand and starts the heating cycle.

-The icon is activated.

-The message HEAT DEMAND appears.

a

ON Ê

13:45 Thursday 63ÉC

Tset 65ÉC

HEAT DEMAND

2.Once demand is registered, the fan is started to exhaust any gases that may be present. This phase is called pre-purge and lasts about 15 seconds.

-The icon is activated.

-The message PRE PURGE appears.

a

ON Ê Ê

13:45 Thursday 63ÉC

Tset 65ÉC

PRE PURGE

3.During the pre-purge, the pressure switch closes.

-The icon is activated.

-The message PRESSURE SWITCH appears.

a

ON	Ê Ê Ê
13:45 Thursday		63ÉC
	Tset 65ÉC
PRESSURE	SWITCH

4.After some time, the pre-purge ceases and the electronic controller reduces the fan speed to the ignition speed. This is followed by the (pre-)glow of the hot surface igniter.

-The icons and are dimmed

-The icon is activated.

a

ON	Ê	Ê
13:45 Thursday		63ÉC
	Tset 65ÉC
GLOW PLUG

gis

5.After a number of seconds pre-glow, the gas control is opened and ignition takes place.

-The icon is activated.

-The message IGNITION appears.

a

ON	Ê	Ê Ê
13:45 Thursday		63ÉC
	Tset 65ÉC
IGNITION

6.After ignition, the flame is detected and the appliance will be running. This means that actual heating has started. The fan speed then increases to the normal working speed, and the pressure switch closes:

-The icon is dimmed.

-The icons and are activated.

-The message RUNNING appears.

a

ON	Ê Ê	Ê Ê
13:45 Thursday		63ÉC
	Tset 65ÉC
RUNNING

7.When the water is up to temperature, the heat demand drops off and the post-purge starts. This lasts about 25 seconds.

-The icons , and are dimmed.

-The icon is activated.

-The message POST PURGE appears.

a

ON	Ê Ê
13:45 Thursday		65ÉC
	Tset 65ÉC
POST PURGE

8.Following the post-purge, the fan stops and the pressure switch opens:

-The icons and are dimmed.

-The message POST PURGE vanishes.

a

ON

14:05 Thursday 65ÉC

With any subsequent heat demand, the heating cycle will resume from step 1.

62	Instruction manual SGE

Image 62

Contents Installation User Your installer Liability Read this manual carefullyTrademarks More informationGis Table of contents Maintenance frequency Service programTroubleshooting Status of the applianceAppendices Performing maintenanceWarranty certificate Table of contents What to do if you smell gas Regulations IntroductionAbout the appliance Introduction Target groups Maintenance Forms of notationSymbol Target group Overview of this document Chapter Target groups DescriptionGis Topics covered in this chapter Working principle of the applianceIntroduction General working principle of the appliance Working principle of the appliance Other settings that govern the control behaviour areAppliances heating cycle 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 ConditionsWater composition Air humidity and ambient temperatureAppliance maximum floor load 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 Practical example of concentric chimney flue SpecificationsFollowing example illustrates how to use the table 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 solar collector Connecting the mains powerConnecting pump station modulating pump Connecting extra head pump Connecting tank sensorConnecting communication cable Connecting Q/T sensorChecking the supply pressure and burner pressure Procedure to check pressures Finish off 3.13.4 Finalising Adjusting the pressureGas data 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 Filling the appliance Filling unvented installationsFilling vented installations Flushing with water Filling with glycolGis Draining Activate the Menu with Draining unvented InstallationsDraining Position the cursor in front of OFFPosition the cursor in front of OFF Confirm OFF with Draining vented installationsDraining solar heating system Draining glycol-filled system Gis Controls Electronic controller ON/OFF switchControl panel Meaning of iconsControl panel Navigation buttonsPC connection Operating modes Operating modes Error conditions Service conditionStatus of the appliance 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 cycleIcon is activated Message Ignition appears Starting and runningIcon is activated Message PRE Purge 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 temperatureReading the energy contribution of the solar heating system Setting the QT sensor yes/noSetting the central heating configuration 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 errorF02 lock out error Code + Description Cause Solution Remark S18 blocking errorF01 blocking 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 Wait until the fan has stopped. The icon is then dimmed Performing maintenanceIntroduction Preparation for maintenance 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