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1、CHAPTER46FACTORYDEHYDRATING,CHARGING,ANDTESTINGDehydration(MoistureRemoval)................................................................................................46.1MoistureMeasurement......................................................................
2、...........................................46.3Charging......................................................................................................................................46.4TestingforLeaks........................................................
3、..................................................................46.4PerformanceTesting....................................................................................................................46.5PROPERdehydration,charging,andtestingofpackagedrefrig-fa
4、ctoryareneededtoensurethemaintenanceofthesemoistureerationsystemsandcomponents(compressors,evaporators,levelsintheoilsandrefrigerant.andcondensingcoils)helpensureproperperformanceandextendNewerinsulatingmaterialsinhermeticmotorsretainmuchlessthelifeofrefrigeration
5、systems.Thischaptercoversthemethodsmoisturecomparedtotheoldragpaperandcotton-insulatedusedtoperformthesefunctions.Thechapterdoesnotaddresscri-motors.However,testsbyseveralmanufacturershaveshownthatteriasuchasallowablemoisturecontent,refrigerantquantity,andthestato
6、r,withitsinsulation,isstillthemajorsourceofmoistureinperformance,whicharespecifictoeachmachine.compressors.DEHYDRATION(MOISTUREREMOVAL)DehydrationbyHeat,Vacuum,orDryAirHeatmaybeappliedbyplacingcomponentsinanovenorbyFactorydehydrationmaybefeasibleonlyforcertainsize
7、sofequipment.Onlargeequipment,whichisopentotheatmosphereusinginfraredheaters.Oventemperaturesof80to170°Careusu-whenconnectedinthefield,factorytreatmentisusuallylimitedtoallymaintained.Theoventemperatureshouldbeselectedcarefullytopreventdamagetothesyntheticsusedand
8、toavoidbreakdownofpurgeandbackfill,withaninertholdingchargeofnitrogen.Inmostinstances,thisequipmentisstoredforshortperiodsonly,sothisanyresidualrun-inoi
