Harman PF-120 User manual

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1413-90-08120c
Please read this entire manual before
installation and use of this pellet fuel-
burning room heater.
Failure to follow these instructions could
result in property damage, bodily injury
or even death.
• Donotstoreorusegasolineorotherammablevapors
andliquidsinthevicinityofthisoranyotherappliance.
• Donotoverre-Ifanyexternalpartstartstoglow,you
areoverring.Reducefeedrate.Overringwillvoid
yourwarranty.
• Complywithallminimumclearancestocombustibles
asspecied.Failuretocomplymaycausehousere.
Checkbuildingcodespriortoinstallation.
• Installation MUST comply with local, regional, state
andnationalcodesandregulations.
• Contactlocalbuildingorreofcialsaboutrestrictions
andinstallationinspectionrequirementsinyourarea.
Tested and approved for wood pellets. Burning of any
othertypeoffuelvoidsyourwarranty.
Hot glass will cause burns.
• Donottouchglassuntilitiscooled
• NEVERallowchildrentotouchglass
• Keepchildrenaway
• CAREFULLYSUPERVISEchildreninsameroomas
stove.
• Alertchildrenandadultstohazardsofhightemperatures.
High temperatures may ignite clothing or other
ammable materials.
• Keepclothing,furniture,draperiesandotherammable
materialsaway.
HOT SURFACES!
Glassandothersurfacesarehotduring
operationandcooldown.
NOTE
To obtain a French translation of this manual, please
contactyourdealerorvisitwww.harmanstoves.com
Pourobtenirunetraductionfrançaisedecemanuel,s’il
vous plaît contacter votre revendeur ou visitez www.
harmanstoves.com
Model(s):
PF-120 Pellet Furnace
NOTICE: SAVE THESE INSTRUCTIONS
CAUTION
!
CAUTION
!
WARNING
!
WARNING
!
Owner’s Manual
Care and Operation
INSTALLER: Leave this manual with party responsible for use and operation.
OWNER: Retain this manual for future reference.
Call your dealer for questions on Installation, Operation, or Service.

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1423-90-08120c
OMNI-Test Laboratories, Inc.
Report #/Rapport #135-S-02b-2

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008

No
PF-120



Tested January 2013 to UL 391-2010, ASTM E 1509-04, and CSA-B366.1-11
Install and use only in accordance with the manufacturer’s installation/operting
instructions. Refer to authorities having jurisdiction for proper installation. Contact
local building or re ofcials about restrictions and installation inspection in your
area.
If there are no applicable local codes, follow ANSI/NFPA 211 and CAN/CSA B365.
Special precautions are required for passing the chimney through a combustible
wall or ceiling.
Inspect and clean exhaust venting system frequently in accordance with the
manufacturer’s instructions. Use a 4” diameter type “PL” venting system.
A Harman PF-120 may be connected to an existing furnace or heat pump duct
system.
Room Heater, Pellet Fuel-Burning Type, Also for Use in Mobile Homes
FOR USE WITH PELLETIZED WOOD FUEL ONLY.
Testé en January 2013 à UL 391-2010, ASTM E 1509-04, and CSA-B366.1-11
Installez et utilisez en accord avec les instructions d’installation et d’opération
du fabricant. Référez-vous à des professionnels avec autorité dans l’installation.
Contactez le bureau de la construction.ou le bureau des incendies au sujet des
restrictions et de l’inspection dans votre voisinage.
S’il n’y a pas de codes locaux, suivez alors ANSI/NFPA211 et CAN/CSA B365.
Prenez des précautions spéciales lorsque vous faites passer une cheminée à
travers un mur ou un plafond combustibles. Inspectez et nettoyez le sustème de
ventilation fréquemment en accord avec les instructions du fabricant. Utilisez un
système de ventilation de 4” de diamètre de type “PL”.
Une Harman PF-120 peut être connecté à une fournaise ou un système de pompe
de chauffage déjà existants.
Appareil de chauffage aux granules, type de chauffage à combustible, également
destinés aux maisons mobiles
FONCTIONNE EXCLUSIVEMENT AVEC DES GRANULES DE BOIS.
Combustibles to Filter Box on Appliance
Combustibles to Connector Pipe
Combustibles to Appliance
Supply Air Plenum to Ceiling
Supply Air Plenum to Combustible Chase
Appliance Body to Ceiling
Combustibles from Stove Front
Clearances to Combustibles/Espaces Libres aux Combustibles
1” (25 mm)
*3” (76 mm)
12” (305 mm)
1” (25 mm)
1” (25 mm)
28” (711 mm)
36” (914 mm)
Des combustibles à la boîte de ltration de l’appareil
Des combustibles au tuyau connecteur
Des combustibles à l’appareil
Provision d’air plénum au plafond
Provision d’air plénum au châssis du combustible
De l’appareil au plafond
Des Combustibles au devant du poêle
*At 16” of pipe length distance from the ue collar while maintaining listed clearances from appliance body.
Un tuyau de grandeur de distance de 16” de l’ouverture du ventilateur doit être en accord avec l’espace libre mentionné de l’appareil même.
Thermostat / Thermostat
Datacom Wire / Fil Datacom
Fan Control High Limit / Contrôle du ventilateur haute limite
Fire Brick / Brique de feu
Heat Exchanger Bafes / Déecteurs d’échange de chaleur
Essential parts and subassemblies provided for eld assembly are as follows /
Pièces essentielles et sous-assemblée procurées pour l’assemblage sont les suivantes:
Burnpot Scraper / Grattoir de la chaudière de chauffage
1638 CFM Blower / Ventilateur CFM 1638
Return Air Filter Box / Boîte de ltration pour retour d’air
Ash Pan / Bassin des cendres
Date of Manufacture / Date de fabrication
2014 2015 2016 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
É

 

DO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE SERVING
ANOTHER APPLIANCE
WARNING! DO NOT operate with re chamber or ash removal doors
open. DO NOT store fuel or other combustible material within
installation clearance area.
CAUTION! Hot while in operation.
DO NOT touch. Keep children, clothing, furniture and other combustible
material out of the installation clearance area.
DO NOT connect this unit to a chimney ue that serves another appliance.
Flooring must be a non-combustible material covering the installation
clearance area, and 18” in front of, and 8” to either side of the fuel loading
doors.
In the event of loss of electrical power:
Consult owner’s manual for restarting your furnace after power is restored.
U.S. ENVIRONMENTAL PROTECTION AGENCY
This model is exempt from EPA certication under 40 CFR 60.531
by denition [Wood Heater (A) “air-to-fuel ratio”].
NE PAS CONNECTER CET APPAREIL À UN TUYAU DE CHEMINÉE
SERVANT UN AUTRE APPAREIL
ATTENTION! Ne pas opérer si la porte du combustible ou la porte de la cuvette
des cendres sont ouvertes. Ne pas placer le combustible et les
matières combustibles à l’intérieur de l’espace désignée pour
l’installation.
ATTENTION! Chaud lors de l’opération.
NE PAS toucher. Gardez les enfants, les vêtements, les meubles et les
matériaux combustibles loin de l’espace désignée pour l’installation.
NE PAS connecter cet apareil à un tuyau de checminée servant un autre
appareil.
Le plancher de l’espace désigné pour l’installation doit ê fait de matière non-
combustible, de 18” en avant, et de 8” de chaque côté des portes d’entrée du
combustible.
Dans le cas d’un manque d’électricité:
Consultez le manuel du propriétaire pour remettre la fournaise en marche
lorsque l’electricité ést revenue.
Rev AP. N. 3-90-08121
Harman PF120 Pellet Furnace
Label measures: 10" high X 6.5"wide
Model
Modèle
Fuel
Combustible
Chimney Connector Size
Grandeur du Tuyau de Cheminée
BTUH/Kw Input Pellet
Rendement des Granulés BTUH/Kw
Electrical Rating
Classication Électrique
Maximum Overcurrent Protection
Protection Maximum du Courant
PF-120 Pellet
Granulés 4” 132,000 BTUH (39 Kw) 120V, 9.3A, 60 Hz 20 AMP
Door
opening
side of the
furnace
18”
8”
8”
48”
52”
FLOOR PROTECTOR
Floor Protection
18”
12”
18”
36”
1”
18”
36”
18”
12”
1”
Listing Label Information/Location
A. Congratulations
Congratulations on selecting a Harman® PF-120 Pellet
Furnace. The Harman® PF-120 Pellet Furnace you have
selectedisdesignedtoprovidetheutmostinsafety,reliability,
andefciency.
Astheownerofanewpelletfurnace,you’llwanttoreadand
carefullyfollowalloftheinstructionscontainedinthisowner’s
manual.Payspecialattentiontoallcautionsandwarnings.
Thisowner’smanual shouldberetainedforfuturereference.
We suggest that you keep it with your other important
documentsandproductmanuals.
Your new Harman® PF-120 Pellet Furnace will give you
yearsofdurableuseandtrouble-freeenjoyment.Welcome
totheHarman®family!
Themodelinformationregardingyourspecic
furnacecanbefoundontheratingplateusually
locatedintheareabelowthehopper.
Readthismanualbeforeoperatingthisappliance.
PleaseretainthisOwner’sManualforfuturereference.
ReadtheInstallationManualbeforemakinganyinstallationornishingchanges.
1 Welcome
Brand:________________________________________________ ModelName:___________________________
SerialNumber:__________________________________________ DateInstalled: __________________________
Appliance Information:
Local Dealer Information
DEALER: Fill in
your name, address,
phone and email
information here and
appliance information
below.
DealerName:________________________________________________________
Address:____________________________________________________________
____________________________________________________________
Phone:_____________________________________________________________
Email:_____________________________________________________________
SerialNumber
ModelName

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1433-90-08120c
Safety Alert Key:
• DANGER! Indicates a hazardous situation which, if not avoided will result in death or serious injury.
• WARNING! Indicates a hazardous situation which, if not avoided could result in death or serious injury.
• CAUTION! Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
• NOTICE: Used to address practices not related to personal injury.
Table of Contents
1 Welcome
A. Congratulations ................................. 2
B. LimitedLifetimeWarranty..........................4
2 Product Specic and Important Safety Information
A. ApplianceCertication............................ 5
B. GlassSpecications(Ceramic) ..................... 5
C. ElectricalRating.................................5
D. BTU&EfciencySpecications.....................5
3 General Information
A. ApplianceSafety ................................ 6
B. ClearSpace....................................6
C. ControlExplanation..............................7
D. FuelSpecication................................8
E. GeneralOperatingInformation......................9
F. MainOperatingControl ...........................9
G.BeforeYourFirstFire............................10
H. WallControl ...................................10
I. LowFuelSensor ............................... 10
4 Operating Instructions
A. StartingYourFirstFire........................... 11
B. FireCharacteristics ............................. 11
C. FeedRateAdjustmentInstructions ................. 11
D. IgnitionCycles.................................12
E. AutomaticIgnition...............................13
F. ManualIgnition.................................14
5 Maintenance and Service
A. ProperShutdownProcedure......................15
B. QuickReferenceMaintenanceChart................15
C. GeneralMaintenance............................15
D. AshRemoval..................................16
E. BurnpotMaintenance............................17
F. AccordionHeatExchanger........................18
G.CombustionBlowerChamber .....................19
H. DistributionBlower&AirFilter...................19-20
I. TubeHeatExchanger ...........................20
!
6 Troubleshooting and Frequently Asked Questions
A. ErrorCodeDescription...........................21
B. FrequentlyAskedQuestions ......................22
C. Troubleshooting................................23
7 Reference Materials
A. SafetyReminders...............................24
B. MotorandComponentLocation....................25
C. LossofPowerAddendum ......................26-27
D. ServiceParts................................28-31
E. ContactInformation.............................33
F. QuickReference...................... BackPage(34)
= Contains updated information



Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1443-90-08120c
B. Limited Lifetime Warranty
HARMAN®CENTRAL HEATING PRODUCTS LIMITED WARRANTY
Hearth&HomeTechnologiesInc.,onbehalfofitsHarman®brand(”HHT”),extendsthefollowingwarrantyforallHarman®
furnaceandboilerproducts(“Products”)thatarepurchasedfromanHHTauthorizeddealer.
Warranty Coverage:Subjecttotheconditions,exclusionsandlimitationssetforthbelow,HHTwarrantstotheoriginal
owneroftheProducts,andtoanytransfereetakingownershipoftheProductsatthesiteoforiginalinstallationwithintwo
yearsfollowingthedateoforiginalpurchase,thattheProductswilloperatefreefromdefectsinmaterialandworkmanship
undernormalconditionsanduse,asdescribedintheoperatinginstructionsfurnishedwiththeProduct,duringthewarranty
perioddescribedbelow.HHTwill,atitsoption,repairorreplaceanyProductcoveredbythiswarrantythatisdeterminedto
bedefectiveinmaterialorworkmanship.
Warranty Period:The warrantyperiodrunsfor sixyears,exceptformechanicalandelectricalcomponents,whichare
warrantedforthreeyears.Thewarrantyperiodbeginsontheearlierof:(i)thedateofinvoicefortheProduct;(ii)inthecase
ofnewhomeconstruction,thedateofrstoccupancyoftheresidenceorsixmonthsafterthedateofsaleoftheProduct
byanHHTauthorizeddealer,whicheveroccurs
rst;or(iii)thedate24monthsfollowingthedateofProductshipmentfrom
HHT,regardlessoftheinvoiceoroccupancydate.
Warranty Conditions:ThiswarrantyappliesonlytoProducts:(i)installed,operated,andmaintainedasrecommended
intheProductuser’smanual;(ii)purchasedthroughanHHTauthorizeddealer;(iii)whileremainingatthesiteoforiginal
installation;and(iv)thathavenotbeenalteredafterleavingthefactory.
How to File a Claim:ClaimsmustbemadewithinthewarrantyperiodtothedealerwhosoldtheProduct.Ifthatdealer
cannotprovidethewarrantyservice,contactthenearestHHTauthorizeddealer.Additionalservicefeesmayapplyifyou
areseekingwarrantyservicefromadealerotherthanthedealerfromwhomyouoriginallypurchasedtheProduct.Travel
andshippingchargesforpartsarenotcoveredbythiswarranty.
Warranty Exclusions: This warranty does not cover the following:  (1) consumable and normal wear items, including,
withoutlimitation,ameguides,grates,coalbars,afterburnerhoods,rebrick,gaskets,paint,glassdiscoloration,burnpot
housing weldments, burnpot grate weldments (pellet or corn), burnpot front plates (pellet or corn), burnpot front plate
locks,cornaugerextensions,ceramicinserts,andceramicinsertplates;(2)noisecausedbyminorexpansion,contraction
ormovement of parts; (3) damageresultingfrom:(i) failure to install, operateormaintainthe Product according to the
installationandoperatinginstructionsandlistingagentidenticationlabelfurnishedwiththeProduct;(ii)failuretoinstall
theProductaccordingtolocalbuildingcodes;(iii)shippingorimproperhandling;(iv)abuse,misuse,continuedoperation
with damaged, corroded or failed components, accident, or incorrectly performed repairs; (v) environmental conditions,
inadequateventilation,negativepressureordraftingcausedbytightlysealedconstruction,insuf
cientmake-upairsupply,
orhandlingdevicessuchasexhaustfansorforcedairfurnacesorothersuchcauses;(vi)useoffuelsotherthanthose
speciedintheoperatinginstructions;(vii)installationoruseofcomponentsoraccessoriesnotsuppliedwiththeProduct
or authorized and approved in writing by HHT; (viii) modication of the product not expressly authorized and approved
byHHTinwriting;or(ix)interruptionsoructuationsofelectricalpowersupplytotheProduct;(4)non-HHTcomponents
oraccessoriesusedinconjunctionwiththeProduct; (5)theProducts’capabilitytoheata desiredspace;informationis
providedtoassisttheconsumerandthedealerinselectingtheproperProductfortheapplication;considerationmustbe
giventoProductlocationandconguration,environmentalconditions,insulationandairtightnessofthestructure;or(6)
additionalorunusualutilitybillsincurredduetoanymalfunctionordefectinProducts.
Limitations of Liability: Repair or replacement inaccordancewiththeprovisions of this warranty willbetheowner’s
exclusiveremedyforandwillconstituteHHT’ssoleobligationunderthiswarranty,underanyotherwarranty(expressor
implied),orincontract,tortorotherwise.Noemployee,agent,dealer,orotherpersonisauthorizedtogiveanywarrantyon
behalfofHHT.TOTHEEXTENTALLOWEDBYLAW,HHTMAKESNOOTHERWARRANTY,EXPRESSORIMPLIED,
INCLUDINGANYWARRANTYOFMERCHANTABILITYORFITNESSFORAPARTICULARPURPOSE.HHTWILLNOT
BELIABLEFORANYCONSEQUENTIALORINCIDENTALDAMAGESARISINGOUTOFDEFECTSINORUSEOFTHE
PRODUCTS.Somestatesdonotallowexclusionsorlimitationofincidentalorconsequentialdamages,sotheselimitations
maynotapplytoyou.Thiswarrantygivesyouspeci
crights;youalsomayhaveotherrights,whichvaryfromstatetostate.
Thedurationofanyimpliedwarrantyislimitedtothedurationofthewarrantyperiodspeciedherein.
L:\DOCS\JED\HHT\Warranties\HarmanCentralHeatingProductsWarranty6.16.09CLN

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1453-90-08120c
2 Product Specic and Important Safety Information
A. Appliance Certication D. BTU & Efciency Specications
NOTE: Thisinstallationmustconformwithlocalcodes.
Intheabsenceoflocalcodesyoumustcomplywiththe
UL391-2010,ASTME1509-04,andCSA-B366.1-11 &
(UM) 84-HUD
MODEL: PelletFurnace-PF-120
LABORATORY: OMNITestLaboratories,Inc
REPORT NO. 135-S-02b-2
TYPE: PelletFueledCentral/Supplementary
STANDARD(s): UL391-2010,ASTME1509-04,and
CSA-B366.1-11
Particulate
Emissions Rating: N/A
*BTU Output: 8,000-120,000/hr
Heating Capacity: N/A
Hopper Capacity: 160lbs
Fuel: WoodPellets
Shipping Weight: 580lbs
NOTE: Hearth & Home Technologies, manufacturer of
thisappliance,reservestherighttoalteritsproducts,their
specicationsand/orpricewithoutnotice.
*BTUoutputwillvary,dependingonthebrandoffuelyou
useinyourappliance.Consultyourdealerforbestresults.
WARNING! Risk of Fire! Hearth & Home Technologies
disclaims any responsibility for, and the warranty and agency
listing will be voided by the below actions.
DO NOT:
• Installoroperatedamagedappliance
• Modifyappliance
• Install other than as instructed by Hearth & Home
Technologies
• Operate the appliance without fully assembling all
components
• Overre
• InstallanycomponentnotapprovedbyHearth&Home
Technologies
• InstallpartsorcomponentsnotListedorapproved.
• Disablesafetyswitches
Improper installation, adjustment, alteration, service or
maintenancecancauseinjuryorpropertydamage.
Forassistanceoradditionalinformation,consultaqualied
installer, service agency or your dealer.
Harman® is a registered trademark of Hearth & Home
Technologies.
The PF-120 Pellet Furnace by Harman® is exempt from
Environmental Protection Agency certication under 40
CFR60.531ydenition[WoodHeater(A)“AirtoFuelRatio].
Note: This appliance is also approved for installation
into a shop.
B. Glass Specications
This appliance is equipped with 5mm ceramic glass.
Replaceglassonlywith5mmceramicglass.Pleasecontact
yourdealerforreplacementglass.
C. Electrical Rating
120 VAC, 60 Hz, Start 9.2 Max Amps, 7.5 Amps normal
operation.
NOTE: Some generator or battery back-up systems may
not be compatible with the micro-processor electronics
on this appliance. Please consult the power supply
manufacturer for compatible systems.

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1463-90-08120c
If you expect that small children or vulnerable adults
may come into contact with this appliance, the following
precautionsarerecommended:
• Installaphysicalbarriersuchas:
 - Adecorativerescreen.
 - Adjustablesafetygate.
• Install a switch lock or a wall/remote control with child
protectionlockoutfeature.
• Neverleavechildrenalonenearahotfurnace,whether
operatingorcoolingdown.
• TeachchildrentoNEVERtouchthefurnace.
• Consider not using the furnace when children will be
present.
Contact your dealer for more information, or visit: www.
hpba.org/safety-information.
To prevent unintended operation when not using your
furnace for an extended period of time (summer months,
vacations,trips,etc):
• Unplugfurnacefromreceptacle.
A. Appliance Safety
WARNING! DO NOT operate furnace before reading and
understanding operating instructions. Failure to operate
furnace according to operating instructions could cause
re or injury.
3 General Information
B. Clear Space
WARNING! RISK OF FIRE! Do NOT place combustible
objects in front or to the sides of the appliance. High
temperatures may ignite clothing, furniture or draperies.
NOTICE: Clearances may only be reduced by means
approvedbytheregulatoryauthorityhavingjurisdiction.
WARNING! RISK OF FIRE! Keep combustible materials,
gasoline and other ammable vapors and liquids clear of
appliance.
• Do NOT store ammable materials in the appliance’s
vicinity.
• DoNOT use gasoline, lantern fuel, kerosene, charcoal
lighteruidorsimilarliquidstostartor“freshenup”are
in this heater.
Keep all such liquids well away from the heater while it is in
use as combustible materials may ignite.
ContactyourdealerorHearth&HomeTechnologiesifthe
barrierisnotpresentorhelpisneededtoproperlyinstallone.
HOT SURFACES!
Glass and other surfaces are hot
duringoperationANDcooldown.
Hot glass will cause burns.
• DO NOTtouchglassuntilitiscooled
• NEVERallowchildrentotouchglass
• Keepchildrenaway
WARNING
!
• CAREFULLY SUPERVISE children in same room as
furnace.
• Donottouchduringoperation.
High temperatures may ignite clothing or other
ammable materials.
• Keepclothing,furniture,draperiesandotherammable
materialsaway.

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1473-90-08120c
C. Control Explanation
Status Light
Will be lit in either automatic
or service mode when
pointer is not within off
position band except after
normal shut down.
Combustion Blower Light
Indicates Power to
combustion blower
Feed Motor Light Indicates
Powertothefeedmotor.
Temp dial
The“TempDial”shouldbeinthe“NormalSetting”positionexceptwhenservice
workisbeingdone.Italsoallowsyoutoadjusttheretemperaturewhenthe
“ModeSelector”isin“ServiceMode”usingthescalemarkedfrom1to7.
Note:Duetovariationsintheelectronicsofthecontrolboardandwallcontrol
this is an approximate temperature and may vary +/- 2°
Feed adjuster
Setsthemaximumfeedrate
Test
Runs all motors at full speed
for one minute to check
operation. After one minute
the combustion blower will
go to it’s minimum speed
and remain there. This is to
allow for low draft voltage
adjustment.
Low Fuel Light
Indicates that fuel in the
hopper is low and needs to
be relled. Low Fuel LED
stays on for 15 seconds
after new fuel covers
sensor.
Igniter Light
Indicates power to the
igniter
Lighting Mode Selector
Switched betweenAuto and
Manuallighting
Mode Selector
Seeexplanationbelow.
Diagnostic Display Port
RequiresspecialDDMmonitor
supplied exclusively to service
technicians.
Power Light
Indicates power to the
control, and is also used
during “Test” to check the
LowFuelSensoroperation.
LED will blink to indicate
battery back-up shutdown
if applicable.

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1483-90-08120c
NOTICE
Hearth & Home Technologies is not responsible for
furnaceperformanceorextramaintenancerequiredasa
resultofusingfuelwithhigherashormineralcontent.
D. Fuel Specications
Fuel and Fuel Storage
Pellet fuel quality can uctuate from manufacturer to
manufacturer,andevenfrombagtobag.
Hearth&HomeTechnologiesrecommendsusingonlyfuel
thatiscertiedbythePelletFuelsInstitute(PFI).
FuelMaterial
• Madefromsawdustand/orotherwoodby-products
• Sourcematerialtypicallydeterminesashcontent
HigherAshContentMaterial
• Hardwoodswithhighmineralcontent
• Barkandleavesassourcematerial
• “Standard”gradepelletsandotherbio-mass
LowerAshContentMaterial
• Softwood;pine,r,etc.
• Materialswithlowermineralcontent
• “Premium”gradepellets
Clinkers
Minerals and other non-combustible materials, like sand,
willturnintoahardglass-likesubstancewhenheated.
Treesfromdifferentareaswillvaryinmineralcontent.For
this reason, some fuels will produce more clinkers than
others.
Moisture
Always burn dry fuel. Burning fuel with high moisture
contenttakesenergytodryandtendstocooltheappliance
thus,robbingheatfromyourhome.Damppelletfuelcould
turnbackintosawdustwhichdoesnotowproperlythrough
thefeedsystem.
Size
• Pellets are either 1/4 inch or 5/16 inch (6-8mm) in
diameter
• Lengthshouldbenomorethan1-1/2inches(38mm)
• Pellet length can vary from lot to lot from the same
manufacturer
Performance
• Higherashcontentrequiresmorefrequentmaintenance.
• “Premium” grade pellets will produce the highest heat
output.
• Burning pellets longer than 1-1/2 inches (38mm) can
causeinconsistentfeedingand/orignition.
Werecommendthatyoubuyfuelinmulti-tonlotswhenever
possible. However, we do recommend trying different
brands prior to purchasing multi-ton lots, to ensure your
satisfaction.
CAUTION! Tested and approved for use with wood pellets
ONLY.Burningofanyotherfuelwillvoidyourwarranty.
When changing from “Premium” grade pellets to a
“Standard”or“Economy”gradefuel,theFEEDADJUSTER
will likely need adjusted to a lower setting. When under
maximumdemand,ensurethereisnounburnedfuelbeing
pushedintotheashpan.
Storage
• Woodpelletsshouldbeleftintheiroriginalsealedbag
untilreadytouse,topreventmoisture.
• Donotstorefuelwithinthespeciedclearanceareas,or
inalocationthatwillinterferewithroutinecleaningand
maintenanceprocedures.
CAUTION
!
Tested and approved for use with wood pellets ONLY.
Burningofanyotherfuelwillvoidyourwarranty.
DO NOT BURN GARBAGE, GASOLINE, NAPTHA,
ENGINE OIL OR OTHER INAPPROPRIATE MATERIALS
CAUTION
!

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1493-90-08120c
E. General Operating Information
1. Control Calls For Heat
Theapplianceislikemostmodernfurnaces;whenthecontrol
calls for heat, your appliance will automatically light and
deliverheat.
When the room is up to temperature and the control is
satised,theappliancewillshutdown.
2. Fan Limit Control
ThisapplianceisequippedwithaFanLimitControlswitch
thatoperatesthefanastheplenumtemperaturerisesand
falls.Thecontrolworksindependentfromthecontrolboard.
Figure 3.1
FireHazard.
Keepcombustiblematerials,gasolineand
otherammablevaporsandliquidsclearof
appliance.
• DO NOT store ammable materials in the appliance’s
vicinity.
• NEVER USE GASOLINE, GASOLINE-TYPE LANTERN
FUEL, KEROSENE, CHARCOAL LIGHTER FLUID, OR
SIMILAR LIQUIDS TO START OR “FRESHEN UP” A FIRE
IN THIS HEATER. KEEP ALL SUCH LIQUIDS WELLAWAY
FROM THE HEATER WHILE IT IS IN USE.
• DO NOT BURN GARBAGE, GASOLINE, DRAIN OIL OR
OTHER FLAMMABLE MATERIALS.
• DO NOT USE CHEMICALS OR FLUIDS TO START THE
FIRE.
• Combustiblematerialsmayignite.
• Inspectandcleanuesandchimneyregularly
WARNING
!
F. Main Operating Control
Thecontrolcanbecovered,oruncoveredasshowninFigure
3.1.Therearetabsprovidedonthecoverforeachposition.
Simplymovethecovertothedesiredpositionbyplacingthe
tabsofthecoverintheproperslots.
HOT WHILE IN OPERATION. DO NOT TOUCH
DURING OPERATION. KEEP CHILDREN, CLOTHING,
FURNITURE, AND OTHER COMBUSTIBLE MATERIAL
OUT OF THE INSTALLATION CLEARANCE AREA.
CAUTION
!
DO NOT STORE FUEL OR OTHER COMBUSTIBLE
MATERIAL WITHIN THE MARKED INSTALLATION
CLEARANCES.
WARNING
!
DO NOT OPERATE WITH FUEL-LOADING OR ASH-
REMOVAL DOORS OPEN.

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1410 3-90-08120c
I. Low Fuel Sensor
Thereisalowfuelsensorinthehopperthattellsthecontrol
that the fuel level in the hopper has dropped below the
sensor.Whenthishappens,theLowFuellightontheWall
Controlwillstarttoblink.Youthenknowthatitistimetoll
thehopperwithpellets.
Note:Testing thelowfuelsensorcanbedonebyturning
theFEEDADJUSTERknobto“Test”.ThePOWERlightwill
gooffwhenthesensorisuncoveredandwilllightwhenthe
sensoriscoveredagain.
Note: TheLOWFUELlightontheFurnaceControlwilllight
atthesametime.OnlytheLOWFUELlightontheFurnace
Controlwillremainlitforthreeminutesafterthesensoris
coveredwithpellets.SeeNotebelow.
Note: TheLowFuellightindicatesthatthereispowergoing
totheauxiliaryleadsinthecircuitbreakerjunctionbox.(120
VAC60HzMax.1Amp.)Theauxiliarypowerleadscouldbe
usedifabulkhopperandaugersystemwereinstalled.(see
wiringdiagramonpage36)
Type of Fuel
Pelletizedwoodonly.
Note:Thelowertheashcontentofthepelletsmeansless
heatexchangersurface cleaningthatwillbeneeded.The
cleaner these surfaces are kept, the more efcient the
furnacewillbe.
DO NOT BURN GARBAGE, GASOLINE, NAPTHA,
ENGINE OIL OR OTHER INAPPROPRIATE MATERIALS
CAUTION
!
G. Before Your First Fire
1. Makesureyourappliancehasbeenproperlyinstalledand
thatallsafetyrequirementshavebeenmet.Payparticular
attentiontothereprotectionandventinginstructions.
2. Doublecheckthattheashpanandreboxareempty!
3. Closethefrontdoor.
H. Wall Control
Thewallcontrolactslikeathermostat,athermisterinthe
wallcontrolissendingtemperatureinformationbacktothe
microprocessoronthefurnace.Thisinformationisusedto
determinetheneedtoincreaseordecreasethesizeofthe
reaccordingtothetemperaturedemand.
Setting The Room Temperature
Tosettheroomtemperature,simply turnthetemperature
dialtothedesiredsetting.Thecontrolandthefurnacewill
thenperformtoachievethesettemperature.
Note: The minimum temperature you can set with a full
counter-clockwiseknobpositionis58degrees.Themaximum
temperatureyoucansetwithafullclockwiseknobposition
is90degrees.
WallControlcalibration:The“NormalSetting”ontheTemp
DialoftheFurnaceControl(SeeFig.44)calibratestheWall
Controltemperaturespan.IftheTempDialisnotpointingto
the“NormalSetting”,thetemperaturespancouldvaryby3
degreesupordowndependingontheTempDialknobsetting.

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1411 3-90-08120c
4 Operating Instructions
B. Fire Characteristics
Aproperlyadjustedrehasamediumactiveamepattern
that extends out of the burn pot approximately 6 inches
(152mm).
C. Feed Rate Adjustment Instructions
Thefeedadjustmentcontrolisfactorysetat#4,andshould
beadequateformostfuels. 
However,iftheflameheightistoohighortoolow,youwill
needtoadjustthefeedrate.Waituntiltheappliancehasbeen
burningfor15minutesbeforemakingyouradjustmentsand
a llow15minutesforfeedadjustmenttotakeeffect.
A. Starting Your First Fire
1. Thewallcontrolisrequiredforproperoperationofthis
appliancein“Automatic”mode.Atthistime,llthehopper
withpellets,insurethecontrolissetto“OFF”.Figure4.1.
Plug the power cord into a properly grounded, nearby
outlet.
2. Oncepowerispresent,theunititwillrunthroughaquick
diagnosticstesttoinsurethecontrolisoperatingproperly.
Thisisnormal.
3. Foryourrstreitmaybenecessarytopurgetheauger
systembyputtingthefeedadjusterknobto“Test”prior
tostartingtheunit.Figure4.2.Thisinsuresthatplentyof
fuelenterstheburnpotforproperignition.
Figure 4.4
Figure 4.1 Figure 4.2
Figure 4.3
Odorsandvaporsreleasedduringinitialoperation.
• Curingofhightemperaturepaint.
• Openwindowsforaircirculation.
Odorsmaybeirritatingtosensitiveindividuals.
CAUTION
!
CAUTION
!
DO NOT BURN GARBAGE, GASOLINE, DRAIN OIL,
OR OTHER FLAMMABLE LIQUIDS.
CAUTION
!
HOT WHILE IN OPERATION. DO NOT TOUCH.
KEEP CHILDREN, CLOTHING, FURNITURE, AND
OTHER COMBUSTIBLE MATERIAL OUT OF THE
INSTALLATION CLEARANCE AREA.
WARNING
!
DO NOT OPERATE WITH HOPPER OR ASH REMOVAL
DOORS OPEN.
WARNING
!
DO NOT STORE FUEL OR OTHER COMBUSTIBLE
MATERIAL WITHIN INSTALLATION CLEARANCE
AREA.
FOR SAFETY KEEP FIRING AND ASH PIT DOORS
TIGHTLY CLOSED.
OPERATE THE ELECTRIC FURNACE PERIODICALLY
TO ENSURE THAT IT WILL OPERATE SATISFACTORILY
WHEN NEEDED.
4. Fliptoggleswitchtodesiredmode“autoormanual”.Figure
4.3.Setfeedadjusterknobtodesiredsettingandturn
modedialto“Automatic”or“Service”Figure4.4.Feed
rateof#4isagoodstartingpoint.Adjustmentsmayneed
tobemadedependingonfuelqualityand/orheatoutput
desired.Note: Theigniterwillnotcomeonuntiltheinitial
feedchargeiscomplete.
5.
Thefuelfeedsystemandtheignitershould now beon(If
unitissettoautomode).
6. Oncetheappliancehasignited,letitburnforapproximately
7-10minutes.Afterthistime,theigniterlightshouldturn
offandtheunitshouldbegintooperateperthesettings
atthecontrol.
CAUTION
!
DO NOT USE CHEMICALS OR FLUIDS TO START FIRE


Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1412 3-90-08120c
D. Ignition Cycles
1. Atthebeginningofeachignitioncycle,itisnormaltosee
somesmokeintherebox.Thesmokewillstoponcethe
restarts.
2. Thedistributionblowerwillautomaticallyturnonafteryour
fanlimitcontrolhasreachedthesettemperature.
Thisblowertransfersheatfromyourappliancethrough
yourduct.In“Automatic”modehowever,theblowerwill
turnonandoffinaccordancetowhattemperaturethe
fanlimitcontrolisreadingintheplenum.Whenthewall
controlissatisedtheblowerwillshutdownuntilthewall
controlseesademandforheat.
3. Occasionallytheappliancemayrunoutoffuelandshut
itselfdown.Whenthishappens,theunitwillneedtobe
turnedtotheoffpositionandrestarted.
Ifneeded,followtheinstructionsinSectionA, “Starting
YourFirstFire”.
WARNING
!
Fire Risk
DoNOToperateappliance:
• With fuel-loading or ash-removal doors
open.
• Burnpotooropen.
• Cleaningslideplatesopen.
DoNOTstorefuel:
• Closer than required clearances to
combustiblestoappliance
• Within space required for loading or ash
removal.

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1413 3-90-08120c
1. If starting after an empty hopper, turn Feed Adjuster
to “TEST” (forone60secondcycle).Thiswillchargepellets
intotheaugertubeandalsoallowyoutocheckthemotors
foroperation.Figure4.5.
NOTE: The auger motor will not operate with the furnace
door open.
2.Turn Feed Adjuster to #4.
Ifthisisyourrstre,oryouaretryingdifferentpellets,set
thefeedadjusterto#4,Figure4.6.Thisisaconservative
numberandwillprobablyneedtobeincreasedifmaximum
BTUoutputisdesired.Afteryouknowafeedratesettingthat
workswellforyourapplication,usethatsetting.
3. Flip the Igniter Switch up into the “AUTO-LIGHT”
position,Figure4.7.
Figure 4.5
Figure 4.6
Figure 4.7
E. Automatic Ignition
FireRisk
DoNOToperateappliance:
• With fuel-loading or ash-removal doors
open.
• Burnpotooropen.
• Cleaningslideplatesopen.
DoNOTstorefuel:
• Closer than required clearances to
combustiblestoappliance
• Within space required for loading or ash
removal.
WARNING
!
WARNING
!
HOT WHILE IN OPERATION. KEEP CHILDREN,
CLOTHING, AND FURNITURE AWAY. CONTACT MAY
CAUSE SKIN BURNS.

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1414 3-90-08120c
F. Manual Ignition
Lightingtheremanuallywillnotbenecessaryunlessthe
ignitersystemfails.
1.Flip the Igniter Switch Down intothe“MANUAL-LIGHT”
position.SeeFigure4.8.
2. Open inner and outer ash doors as shown in Figures
5.1 thru 5.3. Located in the maintenance and service
sections of this manual.
3. Fill burnpot with pellets as shown in Figure 4.9. Only
ll level with the front edge. ( DO NOT OVERFILL )
4. Have matches or other ignition source ready.
5. Turn Mode Selectorto“SERVICE”Figure4.10.
Figure 4.8
Figure 4.9
Figure 4.10
ThiswillstartthecombustionblowerandallowtheESPto
controlthereinrelationtotheTempDialsetting1through7.
OncethereiswellestablishedtheTempDialcanremainon
anynumbersettingdesired,orchangedtothe“AUTOMATIC”
setting.Ifyouchangeto“AUTOMATIC”remembertosetthe
TempDialtodesiredtemperature.
NOTE: When the Switch is set to Manual-Light in the
“AUTOMATIC” mode, the wall control will function as in
Auto-Lightexcepttherewillnotbeallowedtogoout.Itwill
onlybeallowedtogotoaminimumburnratebetweenthe
timesthewallcontroliscallingforheat.Thisrateisabout1
poundoffuelperhour.
7. Light the starting gel with a match.
8. Close the doors
Therewilllightandthecontrolwill adjust the re to the
proper level according to the temperature reading at the
wallcontrol.
CAUTION
!
• Avaporashcouldoccuriftoomuchtimeisallowed
topassbeforelightingthestartinggel.
• Care must be taken not to get starting gel on your
handsorclothing.Serious burnscouldoccurduring
thelightingprocess.
• Never try to apply more starting gel to an already
burningre,orarewithsmolderingpellets.
6. Apply starting gel as shown in Figure 4.11.
NOTE: Stirring the starting gel into the pellets usually
allows the re to become established quicker.
NEVER USE GASOLINE, GASOLINE-TYPE LANTERN
FUEL, KEROSENE, CHARCOAL LIGHTER FLUID, OR
SIMILAR LIQUIDS TO START OR “FRESHEN UP” A
FIRE IN THIS FURNACE. KEEP ALL SUCH LIQUIDS
WELL AWAY FROM THE FURNACE WHILE IN USE
WARNING
!
STARTER
GEL
Figure 4.11

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1415 3-90-08120c
5 Maintenance & Service
C. Quick Reference Maintenance Chart
Follow the detailed instructions found in this section
for each step listed in the chart below.
Cleaning or Inspection Frequency Daily Weekly Monthly Yearly
AshPan/AshRemovalfromFirebox 100-120hours OR X
HeatExchanger 100-120hours OR X
Blower,Combustion(Exhaust) Morefrequentlydependingon
thefueltype
OR X
Blower,Distribution OR X
DoorGasketInspection Priortoheatingseason OR X
ExhaustPath Morefrequentlydependingon
ashbuild-up
OR X
Firebox-PrepareforNon-BurnSeason Atendofheatingseason OR X
Burnpot-Burningpellets-hardwood 50Hours OR X
Burnpot-Burningpellets-softwood 60Hours OR X
Glass Whenclearviewofburnpot
becomesobscure
OR X
Hopper/HopperLidGasket OR X
VentingSystem Morefrequentlydependingon
thefueltype
OR X
NOTICE: These are recommendations. Clean more frequently if you encounter heavy build-up of ash at the
recommended interval or you see soot coming from the vent. Not properly cleaning your appliance on a regular
basis will void your warranty.
Shock and Smoke Hazard
• Turn unit to the off position, let appliance
completely cool and combustion blower must
be off. Now you can unplug appliance before
servicing.
• Smokespillageintoroomcanoccurifappliance
isnotcoolbeforeunplugging.
• Riskofshockifappliancenotunpluggedbefore
servicingappliance.
A. Proper Shutdown Procedure
CAUTION
!
B. General Maintenance
Types of Fuel
Thetypeoffuelyouareburningwilldictatehowoftenyou
havetocleanyourburnpot.
Ifthefuelyouareburninghasahighdirtorashcontent,it
maybenecessarytocleantheburnpotmorethanonceaday.
Dirtyfuelwillcauseclinkerstoformintheburnpot.Aclinkeris
formedwhendirt,ashoranon-burnablesubstanceisheated
to2000°F(1093°C)andbecomesglass-like.
Cleaning Cycle Meter
A cleaning cycle hour meter (pictured below) keeps track
ofthetotalaccumulatedhours the feedermotorruns,not
the number of hours the unit is in operation. By knowing
thisyoucankeeptrackofhowoftenyouneedtocleanthe
burnpotandheatexchangerwithyourbrandofpellets.
Some recommended hourly intervals are:
50hoursfortheburnpot.
100hoursforacompletecleaning.
Aftercleaningiscompleted,resetthehourmeterbypushing
theresetswitchlocatedintheupperlefthandcornerofthe
control.
Whenproperlymaintained,yourfurnacewillgiveyoumany
yearsoftrouble-freeservice.Contact your dealertoanswer
questionsregardingproperoperation,trouble-shootingand
serviceforyourappliance.Visitwww.harmanstoves.comto
ndadealer.Werecommendannualservicebyaqualied
servicetechnician.

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1416 3-90-08120c
D. Ash Removal
Itisrecommendedtoremovetheasheswhenthefurnace
isnotinoperation.Thislessensthechancesofcomingin
contactwithhotsurfaces.Ashescanberemovedwhilein
operationbut,extracaremustbetaken.
Open Outer Ash Door
LiftthetwolatchesshowninFigure5.1andopentheouter
door as shown in Figure 5.2. If the Distribution Blower is
runningwhentheouterdoorisopen,someairwillescape
aroundthedooropening.Thisisnotaproblem,howeverany
dustthatiscausedintheashremovalprocesscanpotentially
beblownaround.
Open Inner Ash Door
LiftlatchesshowninFigure5.2andopentheinnerdooras
showninFigure5.3.
NOTE: Keep hopper lid and inner door closed during
operation and maintain all seals in good condition.
Remove Ash Pan
Alwayswearglovestoremoveashpan.Grabtheashpan
bythehandleandpullitoutofthefurnace.Liftthehandle
anduseitforcarryingtheashpan. Close the inner door
before disposing of the ashes.
Disposal of Ashes
Ashes should be placed in a metal container with a tight
ttinglid.Theclosedcontainerofashesshouldbeplacedon
anon-combustibleoororontheground,wellawayfromall
combustiblematerials,pendingnaldisposal.Ifashesare
disposedofbyburialinsoilorotherwiselocallydispersed,
theyshouldberetainedintheclosedcontaineruntilallcinders
havethoroughlycooled.
Soot and Fly-ash: Formation and Need for Removal
Theproductsofcombustionwillcontainsmallparticlesof
y-ash.They-ashwillcollectintheexhaustventingsystem
andrestricttheowoftheuegases.Incompletecombustion,
suchas,duringstartup,shutdown,orincorrectoperationof
thefurnacewillleadtosomesootformationwhichwillcollect
intheexhaustventingsystem.Theexhaustventingsystem
shouldbeinspectedatleasttwicemonthlytodetermineif
cleaningisnecessary.
Inner Door Latches
Outer Door Latches
Figure 5.1
Figure 5.2
Figure 5.3

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1417 3-90-08120c
E. Burnpot Maintenance
Whencleaningtheburnpotusethesuppliedallenwrench
toremoveanybuild-upthatmayhaveaccumulatedinthe
holesoftheburnpotgrate.Makesurealltheholesareopen
andfreefromencrustedcarbonaroundtheedges.
Aspecialeffortshouldbemadetocleanthebottominside
corners of the burnpot where the auger tube enters the
burnpot.Carbondepositscanbuildupovertimeinthisarea
thatcould cause a restriction totheowof pellets and/or
causethepelletstopushontotheburngrateareaunevenly.
Thethreevertical cutsintheburnpot surface(Figure5.4)
aretheretorelieveexpansionstressdotothehighheatthe
materialsees.Someunevennessmayoccurinthisarea.As
longastheholesarekeptcleanandclearofanyblockage
thiswillnoteffecttheoperationoftheunit.
Removing the swing out burnpot:
• Makesuretheunitiscooleddownorcold.
• Removeashpan.
• Swingthelatchhandleupuntilyoufeelitcontactthetop
oftheswingplate.Thenpushupwarduntilyouseethe
burnpotswingout.Figure5.5.
• Lifttheburnpotupoffoftheswingplateintheunit.
• Removetheameguide.
• Emptyanynesthatmayhavebuiltupundertheburn
potgrate.Todothisloosenthe2thumbscrewslocated
onthefrontoftheburnpotandremovethecover.The
airchambercanbecleaned ofanyashthathasfallen
throughtheholesduringoperationandcleaning.Figure
5.6
Before replacing the swing out burnpot:
1. Inspecttheredsiliconegasketonthebackoftheburnpot
tomakesurethereisnodamageorcarbonaroundthe
edgesthatmaycauseapoorseal.Figure5.7.
2. Inspectthesealingsurfaceontheswingplateinsidethe
unit.Thesurfaceneedstobecleanandsmooth.
3. Do not forget to reinstall the ame guide or the
cleanout cover.
4. Make sure the burnpot is fully seated with the latch
handledownasfarasitcango.
Figure 5.4
Vertical cuts
Pulluponhandle
Figure 5.5 Burn pot hinge/Swing plate
Figure 5.7 Red silicone gasket
Thumb screws
Figure 5.6

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.

Harman® • PF-120 Owner’s Manual_R3 • 2014 -___ • 10/1419 3-90-08120c
G. Combustion Blower Chamber
Removethecombustionblowerheatshield.Therearetwo
latchesthat hold the shieldinplace. Figure 5.11. 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.Figure
5.12. 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.Figure5.13.
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.
Note: Inspection, maintenance and cleaning of the
convection/distributionairltershouldbedoneregularly.
H. Distribution Blower and Air Filter
Inspect and clean (if needed) the furnace cold air return
distribution blower and air filter located just below the
combustionblowerchamber.Thisareashouldbeinspected
monthly or more frequently depending on its installation
location.IftheAirFilterisneedingreplacedusea20”x20”x1”
AirFilter,Harman®part#3-40-20201-12.
Latch Figure 5.11
Thumb Screws Figure 5.12
Sealing Overlap Figure 5.13

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