SECTION3–INSTRUMENTS,INDICATORS,ANDSWITCHES
AirCleanerRestrictionIndicator
Airrestrictionisresistanceofairowthroughtheaircleaner.
Accurateairrestrictionismeasuredatmaximumairow.
Figure24Aircleanerrestrictionindicator
Aircleanerrestrictionismeasuredbyanairrestrictionindicator.
Therestrictionindicatormaybelocatedanywherewithintheair
inductionsystemorinstrumentpaneldependingonyourspecic
application.
AirRestrictionIndicatorCalibration
•Theindicatoriscalibratedininchesofwater.
•Theindicatorshouldbetestedperiodically(usinga
mastervacuumgauge)toensureacorrectcalibration.
AirRestrictionIndicatorOperation
•Theyellowpositionindicatorprogressivelyllsthe
windowasairlterrestrictionincreases,lockingatthe
highestrestrictionatfullload.
•Whentheyellowpositionindicatorreachesandlocksin
theredzone,anewairlterelementshouldbeinstalled.
NOTE:Iftheyellowindicatorlocksintheredzone,itis
notnecessarytoshutdowntheengineimmediately,but
anewairlterelementshouldbeinstalledattheearliest
convenience.
AirRestrictionIndicatorReset
•Oncethelterhasbeenchangedresettheairrestriction
indicatorasfollows:
•Pushthebuttonontheindicatortoreset.
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