Installation & Operating Manual
The Harman PF 100 Pellet Pro Furnace
“Ce manuel est disponible en Français sur demande”
R7
SAFETY NOTICE
PLEASE READ THIS ENTIRE MANUALBEFOREYOU INSTALLAND USEYOUR NEW ROOM HEATER. FAILURE TO
FOLLOW INSTRUCTIONS MAYRESULT IN PROPERTYDAMAGE, BODILYINJURY, OR EVEN DEATH.
FOR USE IN THE U.S.AND CANADA. SUITABLE FOR INSTALLATION IN MOBILE HOMES
IF THIS HARMAN PELLET FURNACE IS NOT PROPERLY INSTALLED, A HOUSE FIRE MAY RESULT. FOR YOUR
SAFETY, FOLLOW INSTALLATION DIRECTIONS.
CONTACT LOCALBUILDING ORFIRE OFFICIALSABOUT RESTRICTIONSAND INSTALLATION INSPECTION
REQUIREMENTSINYOURAREA.
CONTACT YOUR LOCALAUTHORITY (SUCHAS MUNICIPAL BUILDING DEPARTMENT, FIRE DEPARTMENT, FIRE
PREVENTION BUREAU, ETC.) TO DETERMINE THE NEED FORAPERMIT.
CETTEGUIDED'UTILISATIONEST DISPONIBLEENFRANCAIS.CHEZVOTRECONCESSIONNAIREDEHARMANSTOVE
COMPANY.
SAVETHESEINSTRUCTIONS.
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Table of Contents
Assembly
4
Venting
10
15
21
Installation
Operation
Maintenance
29
34
Troubleshooting
Feeder Parts
35
36
37
38
39
40
Specifications
Wiring Diagram
Parts List & Options
Warranty
Testing Label
Quick Reference Start-Up 41
Please read this entire manual before you install and use your new
furnace. Failure to follow instructions may result in
property damage, bodily injury, or even death.
DO NOT INSTALL IN A MOBILE HOME.
SAVE THESE INSTRUCTIONS
Harman Stove Company
352 Mountain House Road
Halifax, PA17032
PF100 3
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Assembly
Design
The first thing that needs to be done is deciding
where andhow the furnace willbe installed.
Things that need to be takeninto considerationare
VENTING, SUPPLY&RETURN DUCTING, ELEC-
TRICAL, and Condensation drainage (if A/C is in-
stalled). Don’t forget access to the furnace for service.
Whenthereturnairinlet positionisknownthefilter
boxand distribution blower can be installed. See pages
5, 6, 7, 8.
When the furnace is set into place venting can be
done.
Fig. 1
Venting
Use 4” pellet vent pipe to vent your PF 100.
A combustionblower is used to extract the com-
bustion gases fromthe firebox. This creates a negative
pressure in the firebox and a positive pressure in the
venting system as shown in fig. 2. The longer the vent
pipe and more elbows used in the system, the greater
the flow resistance. Because ofthese facts we recom-
mend using as few elbows as possible and 30 feet or
less ofvent pipe. The maximumhorizontal run should
not exceed 18 feet.
Be sure to use wall and ceiling pass through
fittings (which are approved for pellet vent pipe )
when going through combustible materials.Besure
to usea startingcollartoattachtheventingsystemto the
stove. The starting collar must be sealed to the
stove flue collar with high temp silicone caulking
or aluminumtape, and screwed into the stove flue
collar at least three (3) places.
Fig. 2
Vent Pipe
Clearances and Venting
4” pellet venting pipe ( also known as PL vent ) is
constructed of two layers with air space between the
layers. This air space acts as an insulator and reduces
the outsidesurface temperature to allowa clearance to
combustibles of only2 inches. This 2 inch clearance is
also approved by the pipe manufacturers. See images
on left. See page 14 (Fig. 24 and 26) for larger images.
The sections ofpipe lock together to form an air
tight seal in most cases; however, in some cases a per-
fect seal is not achieved. For this reason and the fact
that the PF100 operates with a positive vent pressure,
wespecify that alljoints withinthe structure should
also be sealed with clear silicone.
The shaded areas are the clear-
ances for the PL vent pipe that must
be maintained at 3”. After the vent-
ing leaves the shaded area it may be
installed at 2” to combustibles.
(Only UL listed wall pass-throughs
and fire stops must be used.)
See NOTES:
on page 12
NOTE:Use only 4” diameter type “L” or “PL”
venting system. Be sure to inspect and clean
exhaust venting system frequently.
4
PF100
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Assembly
Filter Box
(Cold Air Return)
Top (same as bottom)
Solid Side Panel
Switch
Blower access Panel
Filter Frame Panel
Blower access
Panel Cover
Bottom (same as
top)
Fig. 3
NOTE:Read and follow all of the vent pipe
manufacturers’ instructions on the proper
installation andsupport ofthe vent pipe. Adhere to
all clearances.
Assembling Filter Box
Tek screw from outside
Solid Side Panel
The cold air return filter boxcan be assembled
with the filter frame on either side or the back, pro-
vided there is access to the combustionblower and flue
area.
It isnotrecomendedthat the filterframebeinstalled
on the same side as the ash door due to the need to
access the combustion blower, filter, and flue pipe for
service.
Bottom
1. Place the bottomon the floor. The edge closest
to the knockouts will be the edge towards the furnace.
See Fig. 4.
Knockouts
2. Place the desired vertical panelinside the bot-
tom trayand hold into place with one Tek screw in the
bottommiddle hole. (solid panelshown) See Fig 4.
PF100 5
This Edge Toward
Furnace
Fig. 4
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Assembly
Filter Frame Panel
Assembling Filter Box, Cont’d
3. Place the filter frame panelinside the bottom
and inside the solid panelcorner. See Fig. 6 for corner
detail. Make surethat the filter opening isup.See Fig. 5
Hold thefilter panelto thesolid panelwith aTek screw
inthemiddle hole ofthesolid panel, and oneinthe bot-
tommiddle holeunder the filter opening.
Filter opening must be up
NOTE: Do notput anyscrewsinto anyofthetop
holes at this time.
Fig. 5
Fig. 6
Open Side Panel
4. Place the remaining panel, (in this case the
blower access panel) in the bottompaneland into the
corner ofthe solid panel. SeeFig. 7. Make surethat the
panelisintheuprightposition.Therearenocovermount-
ingholesinthe bottomedgeofthispanel. Holdthepanel
into place with one Tek screw in the middle holeofthe
solid panel and one in the bottom middle hole of the
blower access panel.
Fig. 7
6
PF100
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Assembly
Assembling Filter Box, Cont’d
5. Placethetoponthefilterboxasshowninfigure8. At
this time allTek screws canbe insertedaround the filter
box.
Top
Note: Except for the (6) screws that attach the
blower access panelin place. There should not be any
screws protruding fromthe box on the side toward the
furnace. Also DO NOT put a screw into the top center
ofthefilter panelas ascrewinthis locationwillinterfere
withthefilter access cover.
6. Pryout the two knockouts inthe topofthe box
and installtheflexconnector and the switch. See Fig. 9.
Note: Don’t forget the HI-MED-LO switchlabel
onthe switchbefore the locknut.Make surethat the set-
screw on the flex connector is not pointing toward the
furnace end of the box when the locknut is fully
tightened.The filter boxis now readyto installonto the
furnace.
Fig. 8
3 Speed Switch
Follow the Blower mounting instructions onpage
8 before continuingto step #7.
Note: The blower should be mounted onthe fur-
nace before thefilter boxfor easeofdistributionblower
installation.
Flex connector
Note: It is best to wait untilthe blower , filter box,
and cold air return duct work isinstalled before install-
ing the filter and side panel.
Access Panel
Cover opening
7. After the Filter Box is installed on the furnace
the electricalwiring to the three speed switch needs to
be completed. WHITE to WHITE, VIOLET to the
center terminalof the switch, and the BLACK, RED,
BLUE to the terminals shown.
Fig. 9
Note: Theoptional1500 CFM blower is a single
speed blower, therefore the three speed switch willnot
be used. The optional 2000CFM blower is a 4 speed,
only hook up the three colors shown and tape off the
orange wire. See Fig. 10.
Yellow on 2000 CFM motor
8. Installtheaccess panelcover byhooking the lip
at thebottomofthe coverover theedge inthe filterbox.
Use 6 Tek screws to secure the access panel.
Violet 120VAC
9. To installthe filter, insert the filterinto the filter
slot and slide completely into the frame. Take note to
the air flowarrow on the filter when installing.Slide the
filteraccesscoverovertheopeningwiththeupright angle
toward the filter box. If aTek was put into the middle
hole bymistake, remove the screw to allow the access
Fig. 10
cover to fit properly.
PF100 7
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Assembly
Blower Assembly
Installtheblowermountingbrackets onthe blower
as shown in Fig. 11.
1. Install(4)Tekscrewsoneachsidewhereshown
in Fig. 11. Start with the two center screws.
NOTE: There are two smallholesinthe discharge
endofthe blower that matchthe two centerholesonthe
small angle of the blower bracket. The two (2) outer
holes are drilled bytheTek screws.
Mounting Screws
Fig. 11
Fig. 12
Fig. 13
2. Mount blower with brackets installed on the
furnace as shown in Fig. 12. Each side will require 6
Tek screws.
NOTE: Thefurnace blower opening ismade large
enough for the use of a 1500 or 2000 CFM blower.
The blowermounting bracketswillfit either blower. The
inner hole patternis for the 1000 CFM blower and the
outer pattern is for the 1500 or 2000 CFM blower.
NOTE: These Blower Motors are not designed to
be operated without any positive static back
pressure. OPERATION WITHOUT SUPPLY
DUCTWORK OR IN FREE AIR WILL CAUSE
MOTOR OVERLOAD AND PREMATURE
FAILURE.
CAUTION: Regardless of the supply air duct size
installed, the Distribution Blower Motor MUST be
checked forrunning Amperage. Check themotor name
plate for thefullload AMPS. Iftheamperage is running
higher than that listed, a supplyair restricting damper
mayberequired to increase the supplyplenumpositive
static pressure.
3. Mount the filter box on the furnace with ( 8 )
10 x 3/4 Tek screws, 3 on each side. Visually locate
these holes so you are familiar withtheirlocationonthe
filter boxandthe furnace. Access to the mounting holes
can be gained through the blower access panel cover
and the filteropening. See Fig. 14.
Note: Two pieces of 2x4 stacked laying flat on
thefloor 12inchesfromthebloweropening willsupport
thefilterboxduring installation.
Fig. 14
8
PF100
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Assembly
Firebrick
Firebrick installation-required
The firebrick isshipped inthe ashpan. It willneed
to be placed on the brick shelf as shown in Fig. 15. It
can be installed with either face to the fire. Hold the
brick longways and slide it down into the slot on the
shelf. There is a stop at the rear ofthe shelfto stop the
rearward travel.The brick just sits on the shelf in the
uprightposition.
Fig. 15
Baffle installation
The upper heat exchanger baffle comes shipped
along sidetheashpan. Remove theashpanandthebaffle.
This upperbaffle needs to be installed before operating
the furnace.
The baffle has a long 45 degree bend on the bot-
tom ofthe firebox side. See Fig. 17.
The top has a 90 degree bend on the same side to
use as a handle.
Onthe oppositeside there are fourhooks that will
support the baffle.
Fig. 16
Baffle support bracket
Onthe front and rear ofthe fireboxwalls there are
brackets that these hooks fit into. See Fig. 16
Slide the upper baffle down on to the brackets,
whileyou holdthe baffleagainst theheat exchanger.You
willnotice that the upper baffle willholdthe lower baffle
plate into position. See Fig.17.
Upper heat
exchanger baffle
Note how the upper and lower baffles are held
into positionbecause theywillneed to be removed
during heatexchanger cleaning.
o
45 bend
Fig. 17
PF100 9
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Venting
Venting
NOTE: Use only 4” diameter type “L” or “PL”
venting system. Be sure to inspect and clean
exhaust venting system frequently.
INSTALLATION IS TO BE PERFORMED BY A
QUALIFIEDINSTALLER.
4” Type “L” or
“PL” Vent pipe
DO NOT INSTALLA FLUE DAMPER IN THE
EXHAUSTVENTINGSYSTEM OFTHIS UNIT.
DO NOT CONNECT THIS UNIT TO A
CHIMNEY FLUE SERVING ANOTHER
APPLIANCE.
Fig. 18
Thisistheminimumventingconfiguration.
NOTE: This would only be allowed with non-
combustible walls.
The minimumvent configurationisa 90o orTeeon
a starter collar and a 24” lengthhorizontal through an
exterior wall. A cap or other bird screen on the end
should direct the flue gasses down and awayfromthe
structure. See Fig. 18.
INSTALL VENT WALL PASS-THROUGHS AT
CLEARANCES SPECIFIED BY THE VENT
MANUFACTURER
NOTE: All installation clearnaces and restrictions
must be adhered to.
Themaximumhorizontallengthis18feet.The mini-
mumterminationheight above the exteriorgrade is18”.
Themaximumtotallengthofanyconfigurationis30feet*.
* ( see venting graph on page 13 for exceptions )
NOTE: CleanoutTee’s should always beused on
the transitions to horizontal pipe to allow easyaccess
for cleaning.
NOTE: Read and follow all of the vent pipe
manufacturers’ instructions on the proper
installation andsupport ofthe vent pipe. Adhere to
all clearances.
WARNING
The venting graghallows for (one) 90deg. or Tee
fittinginanyconfiguration.
Keep combustiblematerialssuchasgrass, leaves, etc.
at least 3 feet awayfromthe point directlyunder the
vent termination. (between the vent andthe ground)
Ifmore 90’s,T’s, or45’sare neededthetotallength
must be adjusted to allow forthe added restriction.
Up to four (4) additional90’s,Tee’s, or equivalent
45’s can be added as long as the overall length is ad-
justed inaccordance with the values listed below.
( See the venting graph onpage 12.)
WARNING
DO NOT INSTALL IN SLEEPING ROOM
EachVertical ---- 90 deg. or T subtract 2.5 feet
Each Vertical ---- 45 deg.
Each Horizontal- 90 deg. or T subtract 5.0 feet
Each Horizontal - 45 deg. subtract 2.5 feet
subtract 1.5 feet
CAUTION
KEEP COMBUSTIBLES AWAY
FROM FLUE OUTLET.
Anyexteriorventing (vent pipe exposedto out-
side ambiant temperatures) should be kept to a
minimum, due topotentialcondensation problems.
This is especiallyimportant in highhumiditycold
weather climates, such as maritime areas, lake shores,
and low river valleys.
10
PF100
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Venting
PF100 11
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Venting
Requirements forTerminating the Venting
WARNING:Ventingterminalsmustnotberecessed
into awallor siding.
NOTE: OnlyPL vent pipe wallpass-throughs and
fire stops should be used when venting through com-
bustible materials.
NOTE: Always take into considerationthe effect
the prevailingwind directionor otherwind currents will
cause withflyashand /or smoke whenplacing the termi-
nation.
H. Avent must not be installed within 3 feet (90
cm) above a gas meter/regulator assemblywhen mea-
sured fromthe horizontalcenter-line ofthe regulator.1
I. The clearance to service regulator vent outlet
must be aminimumof6 feet.1
J. The clearance to a non-mechanical air supply
inlet to the building or the combustion air inlet to any
other appliance must be a minimumof48”.1
K. The clearance to a mechanicalair supply inlet
must be aminimumof10 feet.1
In addition, the following must be observed:
A. Theclearanceabove grade must be a minimum
of18".1
B. The clearance to a window or door that may
be opened must be a minimumof48" to the side, 48"
below the window/door, and 12" above the window/
door.1
(with outside air installed, 6 feet )
L. The clearance above a paved sidewalk or a
paved drivewaylocated on public propertymust be a
minimumof 7 feet.1,2
M. The clearance under a veranda, porch, deck
or balconymust be a minimumof12 inches.1,3
NOTE: The clearance to vegetation and other
exterior combustiblessuchas mulchis36” as measured
from the center of the outlet or cap. This 36” radius
continues to grade or a minimum of 7 feet below the
outlet.
( with outside airinstalled, 18”)
C.A12" clearance to a permanentlyclosed win-
dow is recommended to prevent condensation on the
window.
D. The verticalclearance to a ventilated soffit lo-
cated abovethe terminalwithina horizontaldistance of
2 feet (60 cm) fromthecenter-line ofthe terminal must
be aminimumof18".
E. The clearance to an unventilated soffit must be
a minimumof12".
F. The clearance to an outside corner is 11" from
center ofpipe.
1Certain Canadian and or Localcodes or regula-
tions mayrequire different clearances.
2A vent shall not terminate directlyabove a side-
walk or paved drivewaywhich is located between two
single familydwellingsand serves bothdwellings.
3Only permitted if veranda, porch, deck, or bal-
conyis fullyopen on aminimumof 2sides beneaththe
floor.
NOTE: Wherepassage through a wall, or partition
of combustible construction is desired, the
installation shallconformto CAN/CSA-B365. (if in
Canada)
G. The clearance to an inside corner is 12".
Inside
Corner
Detail
Fixed
Closed
Fixed
Closed
Openable
Openable
= Air supply inlet
= Vent terminal
Fig. 20
= Area where terminal is not permitted
A
V
PF100
12
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Venting and Clearances
Clearances to combustibles
Ifinstalling thefurnace in a roomseparated fromthe
remainingliving spaces,theminimumsize oftheroommust
be no smaller than 8’ x 8’. See Fig. 21. The reason for this
is heat build-upand required space for service and normal
operation.
This isthe minimumsize ofthe roomeven ifit is built
ofnon-combustible material.
High and low air vents MUST be installed between
the roomandthe remaining living space. Each vent should
be at least 72 square inches in area. ( The vent size will
need to be increased if there is no return air ducting sys-
tem.)
The stripedareasare theminimum clearancesto com-
bustibles which is 36” from stove body, not hopper or
blower.
FloorProtector
PF100
Skidplate
Footprint
The shaded area indicates the required floor protec-
tion area. The PF100 requires 48” x 52” offloor protec-
tioncenteredaroundtheskidplatefootprint. Flooringshould
be aminimumof 26 gauge sheet metalcoveringthe instal-
lation clearance area and 18” in front of, and 8” to either
side of the ash pan door.
18”
48” wide
The 18” clearanceonthe hopper endis a manufactur-
ers recommendationfor adding pellets andor servicing the
feeder mechanism.
Theminimumclearanceto thetopoftheplenumis4”.
Note the minimumheight to the bottomofthe supply
duct ifit crosses the hopper.
Theminimumductconfigurationtoalivingspaceabove
the furnace is as shown in below.An offset ofat least 24”
MUST be installedbetweenthe plenumandthe floorregis-
ter. The register size MUST have an area of at least 240
square inches.
Fig.21
The minimum ceiling height is 6’6”. This is set by the
clearance to combustibles ( 28” ) from the top of the
of the furnace. See Fig. 22.
NOTE: Install vent at clearances
specified bythe vent manufacturer.
CAUTION: When installing a floor
register, the temperature of the
discharge air MUST be taken into
consideration (The discharge air
temperature maybe high enough to
cause burns ifnot properlyoperated
andmaintained.)
CAUTION: The Blower Motor full
load AMPS MUST be checked.A
plenum damper may be required to
adjust themotor fullloadAMPSto the
motor nameplate rating.
Fig. 22
PF100 13
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Venting and Installation
The shaded areas are the clearances for the PL vent
pipethat must be maintainedat3”. Afterthe venting leaves
the shaded area it may be installed at 2” to combustibles.
(Onlylisted4”pellet vent wallpass-throughsand fire stops
must be used.) See Fig. 23 & 25.
181/8”
181/8”
See NOTES: on
page 13
Fig. 25
The PF100 furnacemaybe used andinstalled into an
Chimneys tallerthan20’above theconnectionwillre- existing masonaryorClassAmetalchimney.
Fig. 23
quire a draft test to determineifthe draft istoo high.
Note: The High Burn Draft should not exceed .85
IWC. Someformofa restrictorplate maybe requiredat the
top of high chimneys to reduce the draft. See page 20 for
the Draft Test procedure.
Certain Canadian and Local Codes may require that
the chimney be fully relined. See Fig. 24.
It Can Not be installed ina chimneyserving another
appliance.
The chimneyshould be cleaned andor inspected be-
foreinstallation.
Fig. 26
Fig. 24
Creosote - Formation and Need for Removal - When wood is burned slowly, it produces tar and other organic vapors,
which combine with expelled moisture to form creosote. The creosote vapors condense in the relatively cool chimney flue
of a slow-burning fire. As a result, creosote residue accumulates on the flue lining. When ignited, this creosote makes an
extremely hot fire. The pellet vent pipe should be inspected at least twice monthly during the heating season to determine
if a creosote buildup has occurred. If creosote has accumulated it should be removed to reduce the risk of a chimney fire.
Guidance on minimizing creosote formation and the need for periodic creosote removal: The chimney should be
inspected during the heating season to determine if a creosote build-up has occurred. If a significant layer of creosote has
accumulated (3mm or more) it should be removed to reduce the risk of a chimney fire.
14
PF100
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Installation
Outside Air
Outside airis optional, althoughit maybe required
by some building codes. The benefit of outside air is
higherefficiency andreducedventingrestrictionsmainly
noticed insmalland verytight houses.
To installoutsideair, use23/4”"I.D.galvinizedsteel
flex pipe, part # 2-00-08544 ( 12’ 6” length) or part #
2-00-08545 ( 25’ length). There is a break-away hole
on the rear panel which must be removed before con-
necting the flex pipe. See Fig. 28. The pipe should be
run outside and terminate 3 feet or more below or 1
foot or more to the side ofthe vent pipe outlet. Never
terminate theoutsideair above the vent pipe outlet. The
maximumlength ofthis pipe is 25 feet. Inlet cover part
number 1-10-09542 should be used to keep birds, ro-
dents etc.out ofthe inlet pipe. See Fig. 27.
Inlet Cover part#
1-10-09542
Fig. 27
Outside Air Pipe Knockout
NOTE: Ifoutside air is installed, the inlet cover
should not be placed in an area where drifting ofsnow
or ice willbuild up, blocking the intake air supply.
The OutsideAir knockout is located on the face
of the Feeder Cover. It is pre-cut except for several
small tabs. There is also a filler plate screwed to the
inside to cover the top ofthe hole after the Outside Air
Pipe has been installed. This will allow for removal of
theFeederCoverwithout disconnectingtheOutsideAir
Pipe. See Fig. 28.
Only metal Intake Flex should be used for the
Outside AirSupplyconnection.
Fig. 28
Onlya screened or rodent protected Outside Air
Intakecovershouldbeusedas anoutsideweathercover.
The Outside Air Intake Pipe is inside the Feeder
Cover and to the right ofthe feeder motor. The 2 3/4”
steelflexpipe ismade toslide over theoutsideoftheAir
Intake Pipe. See Fig. 29. It should be held into place
withsomesilicone, foiltape, ora hose clamp. (not sup-
plied )
Outside Air Inlet Pipe
HRV
Wheninstallingina house witha Heat Reclaiming
VentilationSystem(HRV)besurethesystemis balanced
and is not creating a negative pressure in the house.
Note: Ifthefurnace is installed withthe outside air
systemno adjustments to the HRVshould be necessary.
Fig. 29
PF100 15
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Installation
Wall Control Wiring
The WallControlsends and receives it’s informa-
tion fromthe control board through a 4 wire Datacom
cable. There is a 100’ length ofthis cable supplied with
the furnace. 100’ lengths of this cable can also be or-
dered separately, part # 3-20-02583. Or anyDatacom
cable -CAT 3 - 2 twisted pair 24ga solid wire can be
acquiredat alocalelectricalsupplyhouse.Also anyCAT
3- 24ga. solid wire 2, 3, or 4 pair cable can be used
because theyallhave the samepair color combinations.
The maximumlengthofwallcontrolwiringis 200 feet.
The furnace connectingpoint is a 4pole screw ter-
minal block on the side of the hopper just around the
corner to the right of the control. Follow the wiring
instructions on the label alongside the terminal block.
See Fig. 31.
70
65
60
75
80
LOW
FUEL
Fig. 30
CAUTION: Withthis smallofwire gauge, care
must be taken not to overtighten the terminal screws,
thus breakingthe wire.
There are tie-wrap holes in the face ofthe hopper
aprox. every6” to keep thecable secure and out ofthe
way.
TheWallControlis made to fit ona standard wall
case electricalbox. It could also be mounted directlyto
a stud using 2 drywallscrews. In either case the screws
should be turned in and tested for a snug fit when the
Wall Control is slid down over the screws. The Wall
Controlonlyhangs onthe screwsso a good fit is impor-
tant.
Fig. 31
Remove theWallControland make the Datacom
cable connections with the UY auto splicers provided.
DONOT STRIPTHE WIRES. Followingthewiring
diagram on the inside of the Wall Control make each
splice. SeeFig. 32. Insert the two matching color wires
fullyinto the two holes ofone ofthe UY connectors. A
pair of standard Channel-lock pliers works ideally to
squeeze the raised button downinto the UY connector
body. Extra UY connectors can be purchased.
Part # 3-20-00200
Datacom
Cable
Wall Control
Red
Orange -
(+ LED )
( Tstat )
Orange/White - White or Black ( - LED)
Blue - Blue ( Tstat )
Blue/White - Blue
NOTE: A pair of needle nose pliers maybe nec-
essaryto insert theBLUE T-stat wires fullyinto thecon-
nector. Visually inspect to see that the wires are fully
inserted before squeezing the UYsplicer.
Fig. 32
NOTE: The PF100 furnace Can Not be
installed with any other brand ortype of wall
thermostat.
16
PF100
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Installing Duct
Installing Duct
The HarmanPF100maybe connected to a gas or
oil-firedcentralfurnace orheat pumpduct system. Prior
to installation, determine whether all requirements for
installationincluding allclearnaces canbe met.
The PF100 warmair supplyand thecold air return
must beinstalled ina parallelarrangement. EXAMPLE:
The warmair supplyduct fromthe PF100 is to be con-
nected to the warm air supply ofthe existing furnace.
Also the coldair returnduct fromtheexisting furnace is
to beconnected to the coldair returnduct ofthePF100.
Isolationdampers(2)shouldbeinstalledintheductwork.
(1) in the warmair supplyduct for the existing furnace
and (1) in the warm air supply duct of the PF100 after
or “downstream” of the high limit/fan control. These
dampers can be manuallyoperated or fullyautomatic.
In either case, the unit that is not being used must be
prevented frombeing operated. (This also can be done
manuallyor automatically.)NOTE:Anycontrolwiring,
power wiring needed should be performed bya quali-
fied installerand/or electrician.
Fig. 33
The warm-airsupplyoutlet ofthe PF100 shallnot
be connected to the cold-air return inlet ofthe central
furnace because a possibility exists ofcomponents of
the centralfurnace overheating and causing the central
furnace to operateother thanas intended.
We recommendthat the warmair supplyplenum
be constructed ofsheet metal.
PF100 17
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Installing Duct/Air Conditioning
Installing Duct
AddingAirConditioning to the PF100 furnace.
Recommendations forSupplyAirand ReturnAir
duct sizing.
The speed or velocityofair moving through duct
systems increases as the duct decreases insize with the
same CFM blower. The sound of air flowing through
the duct increases as the velocityincreases. Therefore
the largest size duct practialshould be used.
The velocityto sound levelmust betakeninto con-
sideration whenconnecting this furnace into anexisting
duct sustem.
As a primary source furnace the duct systemcan
be installed to fit the customers needs.
These arerecommended SupplyAir duct sizes (in
square inches)for the different CFM blowers that may
be usedwith this furnace.
An easy rule of thumb for A/C CFM blower size
is, .75 to 1 CFM for each square foot of conditioned
space. (std. 8’ceiling height )
The PF100 furnacecanbe fitted withanair condi-
tioning coilmounted inthe supplyair plenum.
The Harman Stove Co. is not responsable for
sizing,duct placement, orinterconnections. Howeverwe
have made adding A/C to the furnace easier with the
informationlisted below.
There is a factory installed junction box readyto
accept yourA/C relay. TheA/C fancontrolcenter with
40 va transformer must have a DPDT relay.
STEVECO # 90-112 - Harman part # 3-20-38056
Other brands are available at localsupplyhouses.
The wiring shouldbe done as per Fig. 34. The low
voltage wiring to the outside condensing unit and the
cooling thermostat are not shown, see condensing unit
diagramsforthat information.
This style relayis used to lock out the feeder sys-
temofthe furnace whentheA/C unit is callingfor cool-
ing. This is a fail-safe against bothunitsoperating at the
same time. See theNOTE inthe lower left corner.
Velocity
I.W.C.
1000CFM
1500CFM
2000CFM
500fpm 700fpm 900fpm Static
.3 min. to .6 max.
270sq.in 210sq.in. 160sq.in.
360sq.in. 290sq.in. 220sq.in.
470sq.in. 360sq.in. 290sq.in.
(These duct sizes are onlyrecommendations. )
TheReturnAirduct systemshouldbe sized aprox.
10 percent larger for heating onlysystems and 20 per-
cent larger ifairconditioningis installed.
CAUTION: Regardless of the supply air duct
size installed the DistributionBlower MotorMUSTbe
checked forrunning Amperage. Check themotor name
plate for thefullload AMPS. Iftheamperage is running
higher than that listed, a supplyair restricting damper
maybe required to increase the supplyplenumpositive
static pressure.
NOTE:
It is highly recomended that the
furnace control be turned to the
“OFF” position whenever air
conditioning is being used, whether
or not it is interconnected.
Fig.34
18
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Installation
FAN/HIGH LIMIT CONTROL
Installation & Set-up
High limit fan control
1. The Fan Controlmust be placed in the discharge
plenumapproximately11 inchesabovethedischargeopen-
ing ofthe furnace as close to center as possible.
Note: The best place is on the same side as the ash
door because of ease of access. See Fig. 35.
Note: Care must be taken when installing the Fan
Controlwhenanair conditioning A Coilis used. The Fan
Controlmust always be installed below the ACoilinlow
plenuminstallations.
2. Installthe flex and wiring.
3. Make sure that the flue venting will not interfere
withthe flexto the FanControl.
4. Pry out one ofthe bottomknockouts ofthe Fan
Control. Installthe 90 degree flex connector as shown in
Fig. 36. One of the locknuts stays on the outside of the
box and one goes on the inside to tighten the connector
into place. This allows for maximum roomfor the wires
around the switches.
Fig. 35
Fan Control
Setpoint
5. REMOVE THE COPPER JUMPER BE-
TWEEN THE LIMIT AND CONTROL
SWITCHES. (It is not needed.) Figure 36 shownwith
copper jumper that has alreadybeen removed.
High Limit
Setpoint
6. Connect the two VIOLET wires to the FAN
CONTROL switch. ( It doesn’t matter which wire is on
which screw). See Fig. 36.
CONTROL
LIMIT
7. Connect the WHITE and SKY BLUE wires to
the LIMIT switch. ( It doesn’t matter which wire is on
which screw). See Fig. 36.
8. Make sure that allofthe wires are out ofthe way
whenclosing thecover. ( Excess twistingand pinching of
the wires could cause a short circuit.)
9. HIGH LIMIT setupis simple, just rotatethe high
limit pointerclockwise untilit is against the tamper-proof
screw. (Never adjust this screw)
Fig. 36
Locknuts outside and inside
NOTE: KEEP THE FAN/LIMIT CONTROL
INSTRUCTIONS WITH THE OWNERS
MANUAL FOR FUTURE REFERENCE.
10. FANCONTROLsetup: Moveboth fan control
pointerstogetheruntiltheytouch, thenrotatebothpointers
together until the gap between them is directly over the
middle 0 of100. See Fig 36.
Note: This is the best fan controlposition we have
found during factorytesting. These fancontrollimits can
NOTE: If fans are used in the fuel storage area,
they should beinstalled so as notto create negative
pressures in theroomwhere the solid-fuel-burning
appliance is located.
be adjusted if desired.
PF100 19
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Installation
Installing Electrical Power:
To installpowerto the furnace first remove the cover
on the circuit breaker junctionbox shown.
Inside youwillfind the mainterminalblock.(See wir-
ing diagramonpage 36 for locationofmain terminalblock
and proper powerconnections). Inthe bottomofthe boxa
knockout holeis provided for the incoming wire.
The minimumrecommended circuit is15 Amp 120
V.A.C. 60 Hz. This furnace should be the onlyappliance
onthe circuit.
This furnace should neverbe poweredby the use
of an extension cord.
The recommended high and low voltages are, 130
V.A.C. 60 Hz maximumhigh voltage, and 113 V.A.C. 60
Hzminimumlowvoltage.
The furnace will continue to operate at voltages as
low as105 V.A.C. , although it can not be guaranteed that
automatic ignitionwilloccur.Also there isthe possibilityof
a distributionblower motor overload.
Fig. 37
NOTE: If other sources of electrical power are
to be used ( such as a generator ) for normal opera-
tion or emergency operation, this source should be
checked before installation. Many generators and
inverters may not supply 120V.A.C. 60Hz. power
stable enough to operate the controlboard properly.
(Controlboarddamage could occur). Checking& Re-
cording the Low Draft:
Draft meter bolt
After the venting is completed, the firebox low draft
will need to be checked and possibly adjusted. After re-
moving the3/8” bolt fromthedraft hole showninFig. 38,
insert the draft meter tube. The inner ash door and the
hopper lid must be latched during this test. ( It is recom-
mended that the draft meter have a scale of0 to 1” WC.)
Turnthe FurnaceControlto “Test”. thiswillstart the
combustionblower andallow you to check and record the
High Draft ______ - IWC date _______ (There is no
adjustment forthe HighDraft)
Fig. 38
Furnace Control
After the first 60 seconds the “Test”mode lowers the
combustionblowervoltage to theLowBurnvoltage. (The
“Test” mode cycles the voltage fromhigh to low every60
seconds).During thisloweredvoltagecycle theLowBurn
Draft must be checked and adjusted if necessary. The
recommended low draft setting should be between -.25 &
-.35IWC. Dependingonthe amount ofverticalrise, it may
not be possible to get a low draft reading inthis range. In
this case, a maximumlow draft of-.55 is acceptable.
The adjustment screwis throughthe smallholeto the
right of the Igniter Light. See Fig. 39.Adjusted the Low
Draft to __________ -IWC.
“Test”
LowDraft Adjustment Pot
Fig.39
Don’t forget to turn the control back to #4.
20
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Operation
Fan Control
Hopper Lid
Latches
Vent Pipe
Hopper
Combustion
blower cover
Heat Exchanger
Shaker Handle
Combustion
Blower
3 Speed Switch
Control Cover
Outer Door Latches
Outer Door
Viewing Glass
Filter Box
Fig. 40
The Control
The control can be covered as shown above, or
uncovered asshown at left. There is a pair ofslots pro-
vided for each position. Simplymove the cover to the
desired position byplacing the tabs on the cover in the
proper slots.
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 fire
chamber or ash removal doors open.
WARNING: Do not store fuel or other
combustible material within installation
clearance area.
Fig. 41
PF100 21
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Operation
Feed adjuster
Sets the maximum feed rate
Power Light
Indicates power to the
control, and is also used
during “Test” to check the
Low Fuel Sensor operation.
Test
Runs all motors ** at full speed
for one minute to check
operation. After one minute the
furnace will go to minimum
burn and the combustion
blower will alternate from high
to low every minute to remind
you that you are still in "Test
Mode".
Status Light
Will be lit in either
automatic or service mode
when pointer is not within
off position band except
after normal shut down.It
also blinks to indicate
errors listed below.
Lighting Mode Selector
Switched between Auto and
Manual lighting
IGNITOR
Low Fuel Light
Indicates that fuel in the
hopper is low and needs to be
refilled.
Combustion Blower Light
Indicates Power to
combustion blower
Mode Selector
See explanation below.
Feed Motor LightIndicates
Power to the feed motor.
...
...
Dealer Diagnostic Port
For dealer maintenance only.
Requires special DDM monitor
supplied to Harman Dealers
exclusively.
IgnitEr Light
Indicates power to the
ignitor
Fig. 42
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 fire temperature
when the “Mode Selector” is in “ Service Mode” using the scale marked
from 1 to 7.
Status light error messages:
1 Blink: Indicates control board self diagnostic failure. This
requires a manual reset*.
3 Blinks: Indicates ESP (Exhaust Sensing Probe) failure. This
requires a manual reset*.
Mode Selector
Allows you to choosebetweenAutomatic Mode, ServiceMode
or OFF.
4 Blinks: Can occur only in the Automatic Mode and
indicates the Wall Control has failed or is not installed. If a
Wall control is then installed thestatus light will automatically
reset.(Note) only after the unit has warmed up.
5 Blinks: (In Auto Light Mode Only)
Automatic Mode
Automatic mode switches operational control of the furnace
to the wall mounted control. This is the mode to use whenever
the furnace is burning in a normal heating application.
Indicates that the igniter has failed to light the fire after 4
consecutive 8 minute attempts. To reset - Turn the Mode
Selector to OFF and then back to Automatic.
Service Mode
Service mode switches control of the furnace to the temp
dial. The temp dial can be set from 1 to 7 to allow a steady
furnace temperature at the desired level. The main purpose
of this mode is to operate the furnace without having to go
back to the wall mounted control.
6 Blinks : Indicates that the control has calculated poor or
incomplete combustion occurring for more than 50 minutes.
A six blink status may be set if the stove is allowed to run out
of pellets. To reset, turn mode selector to "OFF" then back
on to the desired mode. If the unit was not out of pellets, see
Troubleshooting section, Page 35, for more details.
* Manual reset, disconnect power at the circut breaker for
a few seconds and reconnect. If error still occurs call your
Dealer.
OFF Mode
Turning the mode selector to OFF will shut down the furnace.
**TheDistributionBlower is not controlled by the“Test”
operation. The Distribution Blower has it’s own Manual Test
Switch on the Fan / High Limit Control cover.
22
PF100
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Operation
Wall Control
The wallcontrolacts like a thermostat, however,
what is actuallygoing onis a thermister in thewallcon-
trolis sending temperature information back to the mi-
cro processor on the furnace. This information is used
to increase or decrease the size ofthe fire according to
the needs ofthe home.
70
Temperature Dial
65
60
75
80
Setting The Room Temperature
To set the roomtemperature, simplyturnthe tem-
perature dialto the desired setting. The controland the
furnace will then performto achieve the set tempera-
ture.
Note: Theminimumtemperature you canset with
a full counter-clockwise knob position is 58 degrees.
The maximumtemperatureyoucanset withafullclock-
wise knob positionis 90 degrees.
LOW
FUEL
Low Fuel Light
WallControlcalibration:The“NormalSetting”on
theTemp Dialofthe Furnace Control(See Fig.44) cali-
brates the WallControl temperature span.Ifthe Temp
Dial is not pointing to the “NormalSetting”, the tem-
perature span could varyby3 degrees up or down de-
pending ontheTemp Dialknob setting.
Fig. 43
Low Fuel Sensor
There is a low fuelsensor in the hopper that tells
the controlthat the fuellevelin the hopper has dropped
below the sensor.Whenthishappens, theLowFuellight
on the WallControl will start to blink.You then know
that it istime to fillthe hopper with pellets.
Fig. 44
Note: Testing the low fuelsensor can be done by
turning the FEED ADJUSTER knob to “Test”. The
POWER light willgo offwhen the sensor is uncovered
and willlight whenthe sensor is covered again.
Note: The LOWFUEL light ontheFurnace Con-
trol will light at the same time. Only the LOW FUEL
light ontheFurnaceControlwillremainlitforthreemin-
utes after the sensor is covered with pellets. See Note
below.
Low Fuel
Sensor
Note: The Low Fuel light indicates that there is
power going to the auxiliaryleads inthe circuit breaker
junction box. (120 VAC 60 Hz Max. 1Amp.)
The auxiliary power leads would be used if an
optional bulk hopper and auger systemwere installed.
(see wiring diagramon page 36)
Type of Fuel
Pelletized wood only. Note:The lower the ash
content ofthepelletstheless cleaningthat willbe needed
oftheheat exchangersurfaces. Thecleanerthesesurfaces
Fig. 45
are kept, the more efficient the furnace willbe.
PF100 23
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Operation
Starting A Fire Automatically
1. Turn Mode Selector to "OFF".
This resets thecontrolinadditionto turning it off.
Fig. 46
2. Fill hopper with pellets.
When filling the hopper check for excessive fines in
thebottomofthehopper.Finesaresmallpiecesofbroken
pellets(sawdust). Finesdo not floweasilyandoftenbuild
up onthehopper funnelbottomangles. These fines can
bepushedintothefeederopeningandthenfillthehopper
with pellets. As the systemworks, theywillbe burned.
Fig. 47
3. Clean burnpot with scraper, if necessary.
This is usuallya weekly maintenance procedure.
Cleaningtheburnpotwiththescraperwithasmallamount
ofnew fuelinthe bottomis not a problem. First, scrape
the ashes on the front ofthe burn pot into the ash pan.
Then scrape the hole grid surface downward into the
burnpot. Whenthe stove is ignited these scrapings will
be pushed out bythe feeder.
Note: Ifthe DistributionBlower is running when
the outer door is open, some air willescape around the
door opening. Thisis not a problem, however, anydust
that is caused in the process can potentially be blown
around.
Fig. 48
24
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Operation
4. If starting after an empty hopper, turn
Feed Adjuster to "TEST" (for one 60
second cycle). This will purge pellets into
the auger tube and also allow you to check
the motors for operation. NOTE: The auger
motor will not operate with the ash door
open.
Fig. 49
5. Turn Feed Adjuster to #4.
If this is your first fire or you are trying
different pellets, set the feed adjuster to #4,
Fig. 50 This is a conservative number and
will probably need to be increased if maxi-
mum BTU output is desired. After you know
a feed rate setting that works well for your
application, use that setting. Remember, if
your feed rate is too high you may waste fuel
due to overshooting the Wall Control setting.
Fig. 50
6. Flip the Igniter Switch up into the
"AUTO-LIGHT" position.
Fig. 51
7. Turn the Temperature Dial on the wall
control to desired room temperature. Note:
The set temperature on the dial must be higher
than the room temperature for the fire to light.
70
65
60
75
80
WARNING: HOT WHILE IN OPERATION.
KEEP CHILDREN, CLOTHING, AND
FURNITURE AWAY. CONTACT MAY CAUSE
SKIN BURNS.
LOW
FUEL
Fig. 52
PF100 25
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Operation
8. Turn the Temperature Dialon the furnace
control to “NORMAL SETTING”.
Fig. 53
9. Turn Mode Selector to “AUTOMATIC”
This willstart the lighting process ifthe tempera-
ture at the wall controlis less than the set temperature
on the dial.
The PF100is more thanjust an automatic ignition
pellet furnace. The automatic systemwillallow the fire
size to be adjusted to match the heating needs and even
put the fire out if necessary. If heat is needed after the
fire is out, the PF100 will automatically re-ignite and
adjust thefire size to matchthe heating need.
Fig. 54
10. Fill hopper with pellets and remove
ashes as required.
Type of Fuel
Use pelletizedwood only.Note:The lower the
ash content ofthe pellets the less cleaning that will be
needed oftheheat exchangersurfaces. Thecleanerthese
surfaces are kept, the more efficient thefurnace willbe.
NOTE: Do not burn garbage, gasoline, naphtha,
engine oil, or other inappropriate materials in the
PF100.
...
...
Temp Dial
Mode Selector
This is the Control setting that will allow the Wall
Control to function.
Store pelletsinthe manufacturer’swrapping
until needed to prevent pellets from absorbing
moisture. Do not store fuel within the appliance
installationclearances, orwithin thespace required
for fueling, ash removal, and other routine
maintenance operations.
26
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Operation
Lighting A Fire Manually
Lighting the fire manuallywillnot be necessaryunless
the igniter inthe burnpot fails.
Follow steps 1 through 5 of the instructions for
automatic lighting.
Fig. 55
6. Flip the Igniter Switch Down into the
"MANUAL-LIGHT" position. See Fig. 55.
7. Open inner and outer ash doors as shown
in figs. 63, 64, 65, on page 30.
8. Fill burnpot with pellets as shown.
See Fig. 57. Only fill level with the front
edge. ( ------- DO NOT OVERFILL ------- )
Fig. 56
9. Have matches or other ignition source
ready.
10. Apply starting gel as shown in Fig. 58.
NOTE: Stirring the starting gelinto thepellets usually
allows the fire to become established quicker.
CAUTION: A vapor flash could occur if too much
time is allowedto pass before lightingthe starting gel.
Fig. 57
CAUTION:Caremust be takennot toget starting gel
onyour handsor clothing. Serious burnscould occur during
thelightingprocess.
CAUTION:Never tryto applymore startinggelto an
alreadyburningfire, or a fire withsmoldering pellets.
"NEVER USE GASOLINE, GASOLINE-TYPE
LANTERN FUEL, KEROSENE, CHARCOAL
LIGHTER FLUID, OR SIMILAR LIQUIDS TO
START OR "FRESHEN UP"AFIRE IN THIS FUR-
NACE. KEEP ALL SUCH LIQUIDS WELL AWAY
FROM THE FURNACE WHILE IN USE".
Fig. 58
PF100 27
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Operation
11. Turn Mode Selector to “SERVICE”
Thiswillstart thecombustionblowerand allow the
ESPto controlthe fire inrelation to the TempDialset-
ting 1 through 7. Once the fire is well established the
Temp Dialcanremainonanynumber setting desired,or
changed to the “AUTOMATIC”setting. Ifyou change
to “AUTOMATIC”remember to set theTemp Dialto
“ NormalSetting“ for proper WallControlcalibration.
NOTE: When theSwitchis setto Manual-Lite in
the “AUTOMATIC” mode, the WallControlwillfunc-
tionasinAuto-Lite except thefire willnot beallowedto
go out. It willonlybe allowed to go to a minimumburn
rate between the times the Wall Control is calling for
heat.This rate is about 1 pound offuelper hour.
Fig. 59
12. Light The Starting Gel With A Match.
13. Close The Doors
The fire willlight and the PF100 willadjust the fire
to properlevelaccording to thetemperature dialsetting
onthewallcontrol.
14. Return air filter
Check the condition of the return air filter
periodicallyand replace as needed.
Solid-fuelburning appliances need to be cleaned
frequently because soot, creosote, and ash mayaccu-
mulate. Ifyou suspect a chimney/vent pipe fire 1) Call
the fire department. 2) Remove fuelfromthe burn pot
usingthe burnpot scraping toolto scrapethe pelletsinto
the ash pan. 3) Remove the ash pan from the unit and
take outside. Do not place ash pan on a combustible
material. 4) Turnoff circuit breaker at unit. 5) Do not
use the unit untila qualified personhas inspected your
appliance and venting.
28
PF100
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Maintenance
Burnpot cleaning:
The burnpot shouldbe cleaned no lessthanonce a
week. Forbest operationthe burnpot should be cleaned
everytime thehopper is filled withpellets. The fire does
not have to be out to scrape the burnpot although it is
recomended the furnacebeonminimumburnat the time
ofcleaning.
Note: The furnace can easily be turned to mini-
mumburnregardless ofpresent operation. Simply turn
the Mode Selector to SERVICE. Thenturn the Temp
Dialto the #1 setting. Ifthis is done before starting to
refillthehopperthefurnacewillnot beashotwhenscrap-
ingtheburnpot. Whentheburnpot cleaningiscompleted
don’t forget to turnthe controlback to theWallControl
positions. See Fig. 61.
Use the flat end ofthe scraper provided to scrape
down over the holed surface ofthe burnpot grate. See
Fig. 62. It is not necessary to clean out the scrapings
fromthis cleaning because theywill be pushed out the
next timethe auger operates.
Note: Make a specialeffort to scrape the bottom
inside corners ofthe burnpot where the auger tube en-
ters theburnpot.Carbondepositscanbuildup over time
in this area that may cause a restriction to the flow of
pellets into the burnpot.
Fines cleanout cover
Fig. 60
Note: Anold long shank screwdriver withthe end
sharpenedisanidealaidintheremovalofthesedeposits.
Cleaning the burnpot air chamber:
This area onlyneeds to be cleaned twice a heating
season, unlessexcessive buildup isnoticedduringsched-
uled cleanings.
There isa cover onthefront ofthe burnpot to gain
access to the air chamber and igniter. The cover is held
into place by two thumb screws. Loosen the thumb
screwsand removethecover. SeeFig. 60.Theaircham-
ber canbe cleaned ofanyashthat has fallenthrough the
holes during operation and cleaning. Also at this time,
remove thefeeder assemblycover andremove anyfines
that mayhave accumulated.
Possible pellet fines build up area.
Fig. 61
Scrape burnpot
to remove any
carbon build-up
that may have
occured.
NOTE:ALWAYS REMEMBER TO CLOSE
THE CLEANOUTCOVERAFTER CLEANING.
Feeder Chamber (Fig. 61):
This chamber mayget a buildup offinesfromthe feeder
mechanismmovement. Thisareashould becheckedand
cleaned at least once a year.
To remove the feeder cover:
• Remove the 5/16" wing nut.
• Slide the cover off ofthe threaded stud.
• Inspect and clean the inner chamber ifnecessary. See
Fig. 61.
• Reinstallthecover making certain it iscentered onthe
feeder bodyand tighten as tightlyas you can byhand.
Scraping can be done while in
operation.
Fig. 62
PF100 29
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Maintenance
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 re-
moved while inoperationbut, extra caremust be taken.
Open Outer Ash Door
Lift the two latches shown in figure 63 and open
the outer dooras showninfigure 64. Ifthe Distribution
Bloweris runningwhenthe outer door isopen, someair
willescape aroundthe dooropening. This isnot a prob-
lem, however anydust that is caused inthe ashremoval
process can potentiallybe blown around.
Outer Door
Latches
Fig. 63
Open Inner Ash Door
Lift latches shownin figure 64 and open the inner
door as shownin figure 65.
NOTE: Keep hopper lid and ash pan doors closed
during operation and maintain all seals in good
condition.
Remove Ash Pan
Always wear gloves to remove ashpan. Grab the
ashpanbythe handle and pullit out ofthe furnace. Lift
the handle and use it for carrying the ashpan.Close the
inner door before disposing of the ashes.
Inner Door Latches
Disposal of Ashes
Fig. 64
Ashesshouldbeplaced inametalcontainerwith
atight fittinglid. Theclosedcontainerofashesshouldbe
placed on a non-combustible floor or on the ground,
wellawayfromallcombustible materials, pending final
disposal. If ashes are disposed of by burial in soil or
otherwise locallydispersed, theyshould be retained in
the closed container until all cinders have thoroughly
cooled.
Soot and Flyash: Formation and Need for
Removal
The products ofcombustion willcontain small
particles offlyash. The flyashwillcollect in the exhaust
venting system and restrict the flow ofthe flue gases.
Incomplete combustion, suchas occurs during startup,
shutdown, orincorrect operationoftheroomheater will
lead to some soot formation which will collect in the
exhaust venting system. The exhaust venting system
should beinspected at least twicemonthlyto determine
ifcleaningis necessary.
Fig. 65
30
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Maintenance
Cleaning the accordion heat exchanger/firebox:
This cleaning shouldbe done after eachtonofpel-
lets used. The frequencyofthis cleaningwillbe directly
related to the quality and the ash content ofthe pellets
being used. Keep in mind that the cleaner the heat ex-
changer surface is kept, the higher theheat transfer effi-
ciencywillbe.
Upper Baffle
Due to it’s ease of restarting it is recommended
that the furnace be OFFand COOLbefore cleaning.
Before starting to clean the inside of the firebox
area it isrecomendedthat allofthebaffling beremoved.
Start with the upper heat exchanger baffle. See Fig. 66.
Pushstraight upwardonthe lowerashslide angleaprox.
1/2”. This will release the baffle from the positioning
brackets and allow it to be tilted toward the burnpot
and removed fromthe furnace.
Fig. 66
Ash slide angle
Note: Observe the positioning tabs and bracket
system on the rear of the upper baffle as it is being
removed, for easier replacement later.
Remove the lower baffle plate. This baffle is a flat
plate that sits on the furnace floor. Tip the top edge to-
ward theburnpot andlift upand out ofthefurnace. Note
how the bafflebottomedgesits behindtheashpanguide
and against the heat exchanger. See Fig. 67.
Lower
Baffle
Plate
Fig. 67
Ash Pan Guide
With allofthe baffling removed, the entire firebox
area and the accordion heat exchanger can be cleaned.
Use the pointed end ofthe scraper suppliedto clean the
accordion heat exchanger. A small wisp brush, wire
brush, or anold stiffbristled paint brushworks best for
cleaning the firebox walls. All of the fly ash removed
duringcleaningwillfalltothebottomofthefurnacewhere
there is an unobstructed access for cleaning. Even the
bottom ends of the chains can be seen and accessed
easilyfromthe door opening. See Fig. 68.
CAUTION: Cleanout of the heat exchanger, flue
pipe, chimney, andcombustion blowerfan housing,
is especially important at the end of the heating
season to minimize corrosion during the summer
Fig. 68 months, caused by accumulated ash.
Shaker Chain Ends
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Maintenance
Combustion Blower Cleaning
Remove the combustionblower heat shield.There
are two latches that hold the shield inplace . See Fig. 69
Flip the latches up and pull the shield away from the
furnace. Itcannot befullyremoved, it canonlybemoved
downover the wire untilit hangs onthe junctionbox.
The furnace MUST be OFF and COOLbefore
you shouldattempt to clean the combustion blower.
The wire to the combustion blower doesn’t need
to be disconnectedduring the cleaning process.
Latch
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
outwardontheplatehandleuntilthecompleteunit comes
loose. Now rotate the plate counter-clockwise about
1/8 turn. This will allow the complete assembly to be
removed fromthe blower chamber.
Fig. 69
Clean the blower fan blades and the blower plate
sealing overlap. See Fig. 71.
Thumb Screws
Note: Be carefullnot to bend the fan blades, this
willthrow the fanblade out ofbalance or it mayrub the
inner chamber, whichmayaffect theperformance ofthe
furnace. Anyhorizontal and verticalflue pipe directly
above the unit should be cleaned at this time.
Note: The horizontalflue pipe directlyabove the
furnace is the first place fly ash will settle, due to the
slowing of flue gas velocity through horizontal pipe.
Cleaning ofhorizontalventingpipes isveryimportant to
the efficiencyofthis furnace.
Fig. 70
Sealing Overlap
Fig. 71
32
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Maintenance
Clean the flue outlet throat ( this is the hole that
goes up into the flue pipe). See Fig. 72.
Note: The ESP probe sensing tip extends into
this same area. CARE MUSTBE TAKEN NOTTO
DAMAGE THE ESP PROBEDURING CLEAN-
ING. Bending ofthe ESP probe willmake it difficult to
remove ifit should become necessary. See Fig. 72.
ESP Probe
Sealing overlap
Cleantheinnerchamber oftheblower.SeeFig72.
Clean the furnace blower plate, sealing overlap.
See Fig 72. Inspect the tops oftheheat exchanger tubes
wherethechainshakermechanismislocated. Makesure
there are no fly ash buildups that may block the easy
flowoffluegassesinto thecombustionblowerinlet hole.
(Aflashlight may be necessary. )
Fig.72
Access to flue outlet throat
Inspect the chain shaker mechanism for proper
operation.
Note: Flyash canbuild up to the top edges ofthe
heat exchanger tubes without affecting operation. The
chain shaker willcause anyexcess to falldown into the
chamber under the tubes where it can be cleaned out
throughthe fire box. See Fig. 73.
CAUTION: Inspect flue pipes, flue pipe joints and
flue pipe seals regularly to ensure that smoke and
flue gases are not drawn into, and circulated by,
the air-circulation system.
Cleaning the Tube heat exchangers:
The heatexchangerstubeshave anexternal handle
that operatesthe cleaning mechanism. SeeFig. 74.
This cleaning shouldbe done at least once a week,
althoughit canbe done as oftenasdesired. The cleaner
the heat exchangers are, the more efficient the furnace
willbe. This cleaning canbe done at anytimeand inany
mode ofoperation.
Lower cleanout chamber
Fig. 73
Shaker
handle
Thehandlehastwo directions ofmovement, Right
to Left and Inand Out.Allinside surfaces ofthese rect-
angular tubes canbe cleaned with thisrange ofmotion.
First, withthe handle pushed in, turnthe handle right to
left, the full sweep, several strokes. Second, with the
handlepointingstraight down, pullout and pushinward
several strokes. Third, with the handle allthe wayout,
turnthe handleright to left, the fullsweep, severaltimes.
End withthe handle pushed inwardand pointing down.
PF100 33
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Troubleshooting
FEEDER DOES NOT FEED
1. No pellets in hopper.
SMOKE IS VISIBLE COMING OUT OF VENT
1. Air-fuel ratio is too rich.
2. Firebox draft may be too low for low draft
pressure switch in feeder circuit to operate.
Check for closed doors, loose or missing
gasket on doors or hopper lid, or a faulty pres-
sure switch.
3. Feed motor will not run until ESP
senses 165 deg. F. Maybe you did not put
enough pellets in the burn pot before lighting the
fire manually.
A. Feed rate too high.
B. Draft too low caused by a gasket leak.
LOW HEAT OUTPUT
1. Feed rate too low
2. Draft too low because of gasket leak.
3. Poor quality or damp pellets
4. Combination of 1 and 2.
4. Something is restricting flow in the hopper or
causing the slide plate to stick.
Helpful Hints
Cleaning Burn Pot
Whenever your stove is not burning, take the
opportunity to scrape the burn pot to remove
carbon buildup. Avacuum cleaner is handy to
remove the residue. Be sure the stove is cold if
you use a vacuum.
5. Feed motor has failed.
PARTIALLY BURNED PELLETS
1. Feed rate too high.
2. Draft too low. (Check burn pot clean-out slide
and door gasket).
3. Burn pot or heat exchanger tubes may need
to be cleaned.
4. Combination of all the above.
Carbon buildup can be scraped loose with
the fire burning using the special tool provided
with your stove. Scrape the floor and sides of the
burn pot. The carbon will be pushed out by the
incoming fuel. Always wear gloves to do this.
5. #6 status blink:A 6 blink control board status
indication is caused by poor or incomplete
combustion. TheAutomatic Ignition circuit board
has the ability to track the combustion through
feed settings and ESP temperatures. When the
control board has calculated poor or incomplete
combustion, it will shut down the unit as a safety
feature. (Poor or incomplete combustion is a
contributer of creosote which may cause a
chimney fire)
A 6 blink status may be caused by several things:
1. Blocked or partially blocked flue.
2. Blocked or partially blocked inlet air.
a. Backdraft damper on the inlet pipe may be
stuck closed.
Removing Ashes
Turn the Temp Dial to number 1 approxi-
mately 30 minutes before removing ashes. This
will result in a cooler stove and ash pan.
Maximum FeedAdjuster settings are not
needed in most cases. Operating in the normal
range (#4) is recommended when maximum heat
output is not required. The ESP probe prevents
the stove from being over-fired.
Keep the stove free of dust and dirt.
b. If outside air is installed, the inlet cover may
be blocked.
3. The air chamber under the burnpot may be
filled with fines and small bits of ash.
4. The holes in the burnpot may be getting filled
with ash or carbon buildup.
Fuel
Pellet fuels are put into 3 categories in terms
of ash content. Premium at 1% or less, Standard
at 3% or less and all others at 3% or more.
The P68 is capable of burning all 3 categories
of pellets due to a patented feeder and burn pot
system.
It should be noted, however, that higher ash
content will require more frequent ash removal,
scraping of the burn pot, and may provide less
BTU's per pound. Normally, standard and high ash
pellets cost less than premium pellets and can be
cost effective when burned in the P68.
The moisture content must not exceed 8%.
Higher moisture will rob BTU's and may not burn
properly.
5. Combustion blower fan blades may need
cleaned.
6. There is no fuel in the hopper.
SMOKE SMELL
Seal the vent pipe joints and connection to stove
with silicone.
FIRE HAS GONE OUT
1. No pellets in hopper.
2. Draft setting is too low.
3. Something is restricting fuel flow.
4. Feed motor or combustion blower has failed.
5. Power failure or blown fuse.
34
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Feeder Parts
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Specifications
36
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Wiring Diagram
Wiring Diagram
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Parts List
Rubber Grommet (7.5’) Hopper lid gasket 0-88-00248
IgniterElementAssembly
Burn Pot Weldment
ExchangerBaffle-Top
ExchangerBaffle-Bottom
Arrow Scraper
Flame Guide
Flame Guide Insulator
Thermister Probe
1-10-06620
1-10-73403
2-00-73418
2-00-73314
2-00-773850
3-00-08534
3-44-35263
3-20-00744
3-20-08101
3-20-03100
3-20-9301
Thermostat
Circuit Board G4941
DifferentialSwitch
5” Single FanBlade (standard )
1000 CFM Distribution Blower Motor
1000 CFM DistributionBlower Complete
Black ControlKnobs (2)
3-20-40985
3-20-36648
1-10-01007
3-31-00534
White/Black ControlKnob
ControlKnob Shaft
12 X 6 X 1.25 Firebrick
Glass WithGasket
Ash Pan
BurnPot Gasket
WiringDiagram
Owners Manual
Hopper Lid Label
Chain Shaker Gasket
3-31-00968
3-31-00982
3-40-86125
1-10-5555
1-10-73351
3-44-00409
3-90-73370
3-90-08101
3-90-08415
3-44-08100
Low FuelSensor
CombustionBlower
4-20-03835
3-21-08639
2-00-00539
3-20-04947
3-20-334110
3-20-04946
3-20-70020
3-40-20201
3-20-03018
3-20-04948
3-20-23139
3-20-02583
InnerAshDoor Gasket
Circuit Breaker Harness
10Amp Circuit Breaker
4 PoleThermostat Extension
3 Speed Switch
20 X 20 X 1Air filter
3 PositionTerminalBlock
JunctionBoxHarness
FanLimit
2 Pair Twisted Cat 3 Cable (100’)
Options:
5” Double Fan Blade ( high altitude )
1500 CFM Blower
2000 CFM Blower
OutsideAirAssembly
12-1/2’ FlexPipe 2-3/4” ID
25’ Flex Pipe 2-3/4” ID
3-20-502221
1-00-00682
3-21-52092
1-10-09542
2-00-08544
2-00-08545
38
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Warranty
HARMAN CENTRALHEAT WARRANTY
5 YEAR LIMITED WARRANTY (Residential)
1YEAR LIMITED WARRANTY(Commercial)
Harman Stove Company warrants its central heat products to be free from defects in material or workmanship, in normal use and
service, for a period of 5 years from the date of sales invoice and for mechanical and electrical failures, in normal use and service,
for a period of 1 year from the date of sales invoice.
If defective in material or workmanship, during the warranty period, Harman Stove Company will, at its option, repair or replace
the product as described below.
The warranty above constitutes the entire warranty with respect to Harman Stove Company. HARMAN STOVE COMPANY
MAKESNO OTHERWARRANTY, EXPRESSED OR IMPLIED, INCLUDING “ANY”WARRANTYOFMERCHANTABILITY,
OR WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. No employee, agent, dealer, or other person is authorized to
give any warranty on behalf of Harman Stove Company. This warranty does not apply if the product has been altered in any way
after leaving the factory. Harman Stove Company and its agents assume no liability for “resultant damages of any kind” arising
from the use of its products. In addition, the manufacturer and its warranty administrator shall be held free and harmless from
liability from damage to property related to the operation, proper or improper, of the equipment.
THEREARE NO WARRANTIES, WHICH EXTEND BEYOND THE DESCRIPTION ON THE FACE HEREOF.
THESE WARRANTIES APPLY only if the device is installed and operated as recommended in the operators manual.
THESE WARRANTIES WILL NOT APPLY if abuse, accident, improper installation, negligence, or use beyond rated capacity
causes damage.
HOW TO MAKE A CLAIM - any claim under this warranty should be made to the dealer from whom this appliance was
purchased. Then contact is made with manufacturer, giving the model and serial numbers, the date of purchase, your dealer’s
name and address, plus a simple explanation of the nature of the defect. Extra costs such as labor, mileage and overtime are not
covered. Nuisance calls are not covered by these warranties.
THISWARRANtYISLIMITEDTODEFECTIVEPARTS, REPAIRAND/ORREPLACEMENTATHARMANSTOVECOMPANY’S
OPTIONAND EXCLUDESANYINCIDENTALAND CONSEQUENTIALDAMAGESCONNECTEDTHEREWITH.
WARRANTY EXCLUSIONS: Failure due, but not limited to, fire, lightning, acts of god, power failures and/or surges, rust,
corrosion and venting problems are not covered. Damage and/or repairs including but not limited to; filters, fuses, knobs, glass,
door packing, paint, batteries or battery backup and related duct work are not covered. Also excluded from this warranty are
consumable or normal wear items including but not limited to; grates, fire brick, gaskets. Additional or unusual utility bills incurred
due to any malfunction or defect in equipment and the labor cost of gaining access to or removal of a unit that requires special
tools or equipment are not covered. Maintenance needed to keep the stove in “good operating condition” is not covered. This
includes, but is not limited to, cleaning, adjustment of customer controls and customer education. Labor, material, expenses and/
or equipment needed to comply with law and/or regulations set forth by any governmental agencies are not covered.
This warranty provides specific legal rights and the consumer may have other rights that vary from state to state.
PLEASEREADLITERATURE BYTHEMANUFACTURERFORTHEVARIOUSACCESSORYDEVICES.THEMANUFACTURER
WARRANTSTHESEACCESSORYDEVICES,NOTHARMAN STOVECOMPANYORTHEIRWARRANTYADMINISTRATOR.
FURTHERMORE, THESE ACCESSORY DEVICES MUST BE INSTALLED AND USED ACCORDING TO THE
RECOMMENDATIONSOFTHE MANUFACTURER.
Remedies - The remedies set forth herein are exclusive and the liability of seller with respect to any contract or sale or anything
done in connection therewith, whether in contract, in tort, under any warranty, or otherwise, shall not, except as herein expressly
provided, exceed the price of the equipment or part of which such liability is based.
CLARIFY - The above represents the complete warranty, which is given in connection with central heat, manufactured by
Harman Stove Company. No other commitments, verbal or otherwise, shall apply except by a written addendum to this warranty.
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Testing Label
40
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