Daikin 90 Plus AFUE - Page 54

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©2014DaikinNorthAmerica,LLC
CheckingDuctStatic
 Thepositive staticreadingis
takenatthefurnacesupply
outlet,andmustberead
betweenthefurnaceandthe
coolingcoil.
 Thenegative staticreadingis
takenatthefurnacereturnduct
inlet,andmustbereadbetween
thefurnaceandfilter.
 Takeductstaticreadingsthrough
testholesinducts,andta
p
eup
holesonceyourtestiscomplete.
©2014DaikinNorthAmerica,LLC
CheckingDuctStatic
SupplyAir
Inclined
Manometer
Measure
Negative
Static
Return
Air
Stepstodeterminetotal
externalstaticpressure:
 Inspect/replacefilterin
furnace.
 Installaninclined
manometer,magnehelic,
ordigitalmanometerinto
returnductoffurnace
closesttoblower,but
downstreamoffilter.
 Measurethenegative
staticpressureofthe
returnductattheinletof
thefurnace.