Harman PF100 - Maintenance - Blower and Airflow; Combustion Blower Cleaning

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3-90-08101R23_06/13
Combustion Blower Cleaning
Removethecombustionblowerheatshield.Therearetwo
latchesthatholdtheshieldinplace.SeeFig.69Flipthe
latchesupandpulltheshieldawayfromthefurnace.Itcan
notbefullyremoved,itcanonlybemoveddownoverthe
wireuntilithangsonthejunctionbox.
ThefurnaceMUST be OFF and COOLbeforeyoushould
attempttocleanthecombustionblower.
The wire to the combustion blower doesn’t need to be
disconnectedduringthecleaningprocess.
Loosenthethree(3)thumbscrewsabout4turnseach.See
Fig.70.Holdthemotorheadwithonehandandtheblower
platehandlewiththeotherhand.Pulloutwardontheplate
handleuntilthecompleteunitcomesloose.Nowrotatethe
platecounter-clockwiseabout1/8turn.Thiswillallowthe
completeassemblytoberemovedfromtheblowerchamber.
Cleantheblowerfanbladesandtheblowerplatesealing
overlap.SeeFig.71.
Note:Becarefulnottobendthefanblades,thiswillthrow
thefanbladeoutofbalanceoritmayrubtheinnerchamber,
which may affect the performance of the furnace. Any
horizontalandverticaluepipedirectlyabovetheunitshould
becleanedatthistime.
Note: Thehorizontaluepipedirectlyabovethefurnaceis
therstplaceyashwillsettle,duetotheslowingofue
gasvelocitythroughhorizontalpipe.Cleaningofhorizontal
ventingpipesisveryimportanttotheefciencyofthisfurnace.
Maintenance
Inside Hopper
Mufer
Low Fuel Sensor
TheDraftDifferentialPressureSwitchmonitorsthedraft
pressureinthehopper.Thistting,knownastheMufer,
mayneedtobecleanedoccasionally.Usecautionwhen
performinganymaintenanceinthehoppersoyoudon’t
damagetheMuferortheLowFuelSensor.
Latch
Fig. 69
Thumb Screws
Fig. 70
Sealing Overlap
Fig. 71