SystemAir Danvent DV

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Annex10—3
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10.7Menu–drawingofthemenutoguidetheuser
Drawingofthemenuappearsfromsection12
10.8Thestartdispla y
Thestartpictureshownwhenthepotentiometerhasnotbeenactivatedfor10minutes
 In:nnn%showsthecapacityorderedbythemainairhandlingunitcontroller.
 Out:nnn%showsthecapacityorderedbythisinternalcontroller‐LMC251–ofthecompressor.
10.9Settings
AboutbasicsettingsinthesubmenusintheLMC251
10.10Automaticresetsofthehighpressure switch
Thisisaboutthemaximumnumberofautomaticresetsofthehighpressureswitchthatareacceptable
withinonehour.Ifthisnumberisexceeded,theunitwillbeshutdownuntilthehighpressureswitchhas
beenresetmanually.
10.11Polarity
TheAlarmpolaritycanbesetto”NormallyOpen” or”NormallyClosed”.
10.12Hotgas–settingofperiod
Thisisthenumberofsecondsthatthehotgasvalveisopen.Theperiodisrelativelylong,butthesupply
temperatureisnotoscillatingatallandthestabilityofthesupplytemperatureissufficient.Thenumberof
secondsisafactorysettingthatshouldnotbereduced.Reductionofthe
numberofsecondswillnot
improvethestabilityofthetemperaturetoadegreethatcanbeprovenbymeasurements.Ifthenumber
ofsecondsisreduced,thenumberoftimesthatthevalveisopenedandclosedwillbeincreased–maybe
considerably,andthevalvecouldbeworn
outprematurely.
10.13Limiter
DeltaMaxisthemaximumacceptablechangein%/secondoftheactualcoolingcapacity.
10.14Service
Inthismenuinformationaboutthesoftwareversioninthecontrolleraswellas2submenus–“Manual
operation”and“Runtime”
10.15Manualoperation
Whenthemenu–Manualoperation‐isactivated,thetechnicianisabletocontroltheoperationmanually,
whenthestartsignalfromthemainairhandlingunitcontrollerison(startsignalisjustpotentialfree
connectionofthetwoterminals–3&4).Thisprocedureisrelevantforthetestduring
theannual
maintenancewiththecontrolofallsafetyandregulationproceduresorafterinstallationofnew
components.
Ifnonewsettingshavebeencarriedoutonthecontrollerfor10minutes,themenu–Manualoperation–
isdeactivated,andtheunitreturnstotheautomaticmode.
10.16Runninghoursandhotgasactivations
Inthismenuthenumberofrunninghoursforthecompressor,andthenumberofactivationsofthehotgas
valvecanberead.Thisinformationisvaluableforthemaintenance.
10.17Alarm
10.17.1Alarm
Showtheactualalarmwithalarmnumber.