Kroll Kozy - Heater was running ok but goes out; Oil under pan, ash wet;tar-like

Kroll Kozy
Page 12
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� High/lowselectornotengagedproperly.Youcancheckifthepumpisturningbyfeeling
underthecontrolboxwithyourfinger,afterthethermostathasstartedthemotor.
� Gritinpump.Thishappensquiterarely,becauseanythingthatwillgothroughthetank
strainerwillgothroughthepump.Butifabitofoilslopsinoverthesideofthestrainer,
it’spossiblesomegritcanjamthepump.Usuallyyourattentionisdrawntothisbecause
itmakesagraunchingnoise.Sometimesyoucanfreeitupbyswitchingitoff,then
turningthepumpbackandforthbyhand.
� d)Blockedoilinletpipe.Seethe“Cleaningandmaintenance”.Ifyoususpectthatthisis
theproblem,takecarewhenunscrewingtheoilfeedline,becauseitmaycontainhotoil
underslightpressure.
#3Heaterwasrunningokbutgoesout.
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� TankEmpty.
� OilinoverflowcupSee1(a).
� Gritinpump–See2(a)
� Toomuchwaterinoil.Unevenburningandahissingsoundaresignsofwater.
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#4Oilisgettingunderthevapourisingpanand/ortheashinthepaniswetandtarlike
insteadofdryandcrusty.
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� Thisindicatesincompletecombustion,whichcanbecausedby:
� Insufficientdraught.Istheflueingoodconditionandbreathingfreely?Verystrong
windscansometimescauseadowndraught.Aspecialantidowndraughthatmaybe
requiredinextremecases
� Combustionfanfaulty.Isitspinningnormally?Doesitneedcleaning?It’ssurprisinghow
lintanddirtcanbuildup.Removefanforthoroughcleaning.
� Noncombustiblewasteoil.It’srarebutsomemodernsyntheticoils,don’tburnwell.A
goodtestistodrainthetankandtryagainwitha“known”batchorwasteoil.
� Crackinpan.Inspectclosely.Evenaveryfinecrackwillopenupathightemperatures.
Crackedordamagedpansmustnotbeused.
� Holesinburnerbasinblockedpreventingadequateflowofcombustionair.
� Splitor“burnedaway”burnerbasin,allowingexcessiveandunevencombustionair.
� Toomuchashinpan.It’ssimplyoverflowing.SeeMAINTENANCE.Youmayneedto
reducetherunningtimebetweenswappingpansand/orrunonlyonLOW.
� Somecontaminantsinwasteoilcancausetheashto“frothup”wheretheoilhitsthe
pan.Thisashcanspillovertheedge,eventhoughthepanisnotfull.Toovercomethis,
� putabitofsteelorsomesuitablepackingofabout3mmthickness,underthepansoit’s
slopingawayslightlyfromtheinletpipe.