Harman PF-120 - Accordion Heat Exchanger Cleaning

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1418
3-90-08120c
F. Accordion Heat Exchanger
Thiscleaningshouldbedonemonthly,oraftereachtonof
pelletsused.Thefrequencyofthiscleaningwillbedirectly
relatedto the qualityandthequantity of thepelletsbeing
used. Keep in mind that the cleaner the heat exchanger
surfaceiskept,thehighertheheattransferefciencywillbe.
Due to its ease of restarting it is recommended that the
furnacebeOFFandCOOLbeforecleaning.
Beforestarting to clean theinsideofthe rebox area itis
recommendedthatallofthebafingberemoved.Startwith
the upper heatexchanger bafe.Figure 5.8. Removethe
rebrickthenpushstraightupwardonthelowerashslide
angleapproximately 1/2”.This will releasethebafefrom
thepositioningbracketsandallowittobetiltedtowardthe
burnpotandremovedfromthefurnace.
Note: Observethepositioningtabsandbracketsystemon
therearoftheupperbafeasitisbeingremovedforeasier
replacementlater.
Removethelowerbafeplate.Thisbafeisaatplatethat
sitsonthereboxoor.Tipthetopedgetowardtheburnpot
andliftupandoutofthefurnace.Notehowthebafebottom
edge sits behindthe ash panguide and againstthe heat
exchanger.Figure5.9.
Withallofthebafingremoved,theentirereboxareaand
the accordion heat exchanger can be cleaned. Use the
pointedendofthescrapersuppliedtocleantheaccordion
heatexchanger.Asmallwispbrush,wirebrush,oranold
stiffbristledpaintbrushworksbestforcleaningtherebox
walls and bafe plates.All of the y ash removed during
cleaningwillfalltothebottomofthefurnacewherethereis
anunobstructedaccessforcleaning.Eventhebottomends
ofthechainscanbeseenandaccessedeasilyfromthedoor
opening.Figure5.10.
Ash slide angle
Upper Bafe
Figure 5.8
Ash Pan Guide
Lower Bafe
Plate
Figure 5.9
Shaker Chain Ends
Figure 5.10
CAUTION
!
Cleanout of the heat exchanger, ue pipe, chimney,
and combustion blower fan housing is especially
important at the end of the heating season to minimize
corrosion during the summer months caused by
accumulated ash.