Harman PF-120 - Tube Heat Exchanger Cleaning Mechanism

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1420
3-90-08120c
Cleantheueoutletthroat(thisistheholethatgoesupinto
theuepipe).Figure5.14.
Note:TheESPextendsintothissamearea.CARE MUST BE
TAKEN NOT TO DAMAGE THE ESP DURING CLEANING.
Cleantheinnerchamberoftheblowerhousing,thefurnace
blowerplateandsealingoverlap.Figure5.14.Inspectthe
topsof theheatexchangertubes where thechainshaker
mechanism is located. Make sure there are nofly ash
buildupsthatmayblocktheeasyowofuegasesintothe
combustionblowerinlethole.(Aashlightmaybenecessary.)
Inspectthechainshakermechanismforproperoperation.
Note: Fly ash can buildup to the top edges of the heat
exchanger tubes without affecting operation. Thechain
shakerwillcauseanyexcesstofalldownintothechamber
underthetubeswhereitcanbecleanedoutthroughthere
box.Figure5.14.
CLEANOUT OF THE HEAT EXCHANGER, FLUE
PIPE, CHIMNEY, AND DRAFT INDUCER, IF USED,
IS ESPECIALLY IMPORTANT AT THE END OF THE
HEATING SEASON TO MINIMIZE CORROSION
DURING THE SUMMER MONTHS, CAUSED BY
ACCUMULATED ASH.
CAUTION
!
I. Tube Heat Exchangers:
The heat exchanger tubes have an external handle that
operatesthecleaningmechanism.Figure5.15.
This cleaning should be done at least once a week,
although it can bedone morefrequently.The cleanerthe
heatexchangersare,themoreefcientthefurnacewillbe.
Thiscleaningcanbedoneatanytimeandinanymodeof
operation.
Thehandlehastwodirectionsofmovement,RighttoLeftand
InandOut.Allinsidesurfacesoftheserectangulartubescan
becleanedwiththisrangeofmotion.First,withthehandle
pushedin,turnthehandlerighttoleft,thefullsweep,several
strokes.Second,withthehandlepointingstraightdown,pull
outandpushinwardseveralstrokes.Third,withthehandleall
thewayout,turnthehandlerighttoleft,thefullsweep,several
times.Endwiththehandlepushedinwardandpointingdown.
Theshaker handle should bepushed inward andstraight
downduringnormaloperation.Figure5.15.
Note: Fly ash can buildup to the top edges of the heat
exchanger tubes without affecting operation. Thechain
shakerwillcauseanyexcesstofalldownintothechamber
underthetubeswhereitcanbecleanedoutthroughthere
box.Figure5.16.
ESP
Sealing overlap
Figure 5.14
Lower cleanout chamber
Figure 5.16
Chain
Shaker Handle
Figure 5.15
Inspect ue pipes, ue pipe joints and ue pipe seals
regularly to ensure that smoke and ue gases are
not drawn into, and circulated by, the air-circulation
system.
CAUTION
!
Access to ue outlet throat