USSC American Harvest 6100 User manual

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Please read this entire manual before installation and use of this appliance. Failure to follow
these instructions could result in property damage, bodily injury, or even death.
Contact your local building or fire officials about restrictions and installation inspection
requirements in your area.
Save these instructions.
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Owner’s Manual
UNITED STATES STOVE COMPANY • 227 INDUSTRIAL PARK ROAD • SOUTH PITTSBURG, TENNESSEE 37380 • WWW.USSTOVE.COM
FOR TECHNICAL ASSISTANCE: PHONE: [phone] FAX: [phone]
Part No.: 851566
UNITED STATES STOVE COMPANY
“Keeping NorthAmerica Warm Since 1869”
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MULTI-FUEL FURNACE

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TABLE OF CONTENTS..............................................................................................2
SAFETY PRECAUTIONS ........................................................................................... 3
SPECIFICATIONS ...................................................................................................... 4
Heating Specifications..................................................................................... 4
Dimensions .....................................................................................................4
Electrical Specifications .................................................................................. 4
Safety and EPA Compliance ........................................................................... 4
Fuel Considerations ........................................................................................ 5
INSTALLATION .......................................................................................................... 5
Installation Options.......................................................................................... 6
Floor Protection............................................................................................... 6
Clearances ...................................................................................................... 7
Venting Requirements..................................................................................... 8
Maximum Venting Distance.............................................................................8
Pellet Vent Type .............................................................................................. 8
Pellet Vent Installation..................................................................................... 8
Pellet Vent Termination ................................................................................... 8
Vent Termination Clearances .......................................................................... 9
Through the Wall Installation ........................................................................10
Through the Roof/Ceiling Installation............................................................ 10
Primary and Secondary Furnace Illustrations............................................... 11
OPERATION .............................................................................................................12
How Your Furnace Works .............................................................................12
Damper Control Adjustment.......................................................................... 12
Control Panel ................................................................................................13
Unit Preparation ............................................................................................14
Start-Up Procedure .......................................................................................14
Shut Down Procedure ...................................................................................14
Daily Operation .............................................................................................15
Safety and Convenience Features................................................................ 15
MAINTENANCE........................................................................................................ 15
Exhaust System ............................................................................................ 15
Interior Chambers .........................................................................................16
Ash Disposal ................................................................................................. 16
Check and Clean the Hopper........................................................................16
Main Door Gaskets .......................................................................................16
Blower Motors ...............................................................................................16
Painted Surfaces........................................................................................... 16
Glass .............................................................................................................16
Fall Start-Up .................................................................................................. 16
Spring Shut Down ......................................................................................... 16
Yearly Servicing............................................................................................. 16
REPAIR PARTS DIAGRAM & LIST ....................................................................17-18
WIRING DIAGRAM................................................................................................... 19
TROUBLE SHOOTING ............................................................................................20
ERROR CODES ....................................................................................................... 21
FLASHING INDICATORS......................................................................................... 21
NOTES.................................................................................................................22-23
Table of Contents

USSC 3
Safety Precautions
IMPORTANT: Readthis entire manual before installing
andoperating this product. Failure todo so mayresult
in property damage, bodily injury, or even death.
Proper installation of this furnace is crucial for safe
and efficient operation.
Install vent at clearances specified by the vent
manufacturer.
Do not connect the pellet vent to a vent serving any
other appliance or furnace.
Do not install a flue damper in the exhaust venting
system of this unit.
Useofoutsideair is not requiredforthisunit. However,
fresh air and return air make-up is recommended.
Contact your local building officials to obtain a permit
and information on any additional installation
restrictions or inspection requirements in your area.
Do not throw this manual away. This manual has
importantoperating and maintenance instructionsthat
you will need at a later time. Always follow the
instructions in this manual.
This heater is designed and approved as a multi-fuel,
such as corn or wood pellets, burning furnace. Use
onlydried shelled corn with a moisture contentof 11%
or less (which provides the best results).Apellet type
fuel used should have an ash content of 1% or less. If
not, efficiency will suffer, and your warranty may be
voided.
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 it is in
use.
A working smoke detector must be installed in the
same room as this product.
Donotunplugthefurnaceifyou suspect a malfunction.
Turn the ON/OFF SWITCH to ”OFF’ and contact your
dealer.
Your furnace requires periodic maintenance and
cleaning (see ”MAINTENANCE ”). Failure to maintain
your furnace may lead to improper and/or unsafe
operation.
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Disconnect the power cord before performing any
maintenance! NOTE: Turning the ON/OFF Switch to
”OFF” does not disconnect all power to the electrical
components of the furnace.
Never try to repair or replace any part of the furnace
unless instructions for doing so are given in this
manual. All other work should be done by a trained
technician.
Allow the furnace to cool before performing any
maintenance or cleaning. Ashes must be disposed in
a metal container with a tight fitting lid. The closed
container of ashes should be placed on a non-
combustible surface or on the ground, well away from
all combustible materials, pending final disposal.
Theexhaustsystemshould be checked monthly during
theburningseasonforanybuild-upofsootorcreosote.
Donot touch the hot surfaces of thefurnace. Educate
all children on the dangers of a high-temperature
furnace. Young children should be supervised when
they are in the same room as the furnace.
A power surge protector is recommended. This unit
must be plugged into a 110 - 120V, 60 Hz grounded
electrical outlet. Do not use an adapter plug or sever
the grounding plug. Do not route the electrical cord
underneath, in front of, or over the furnace. Do not
route the cord in foot traffic areas or pinch the cord
under furniture.
The furnace will not operate during a power outage. If
a power outage does occur, check the furnace for
smokespillage and open a window if anysmoke spills
into the room.
The feed door must be closed and sealed during
operation.
Never block free airflow through the open vents of the
unit.
Keep foreign objects out of the hopper.
Themoving partsof this furnace are propelled by high
torqueelectric motors. Keep all body partsaway from
theaugerwhilethefurnaceis plugged into an electrical
outlet. These moving parts may begin to move at any
time while the furnace is plugged in.
Do not place clothing or other flammable items on or
near this furnace.
This appliance is not intended for commercial use.
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4USSC
Specifications
Heat Output150,000 to 75,000 BTU/hr.
HeatingCapacity2800 - 2,000 sq. ft.
Fuel Burn Rate32.0 - 6.0 lbs./hr.
BurnTime (lowest setting) 125 hours continuous
HopperCapacity 250 lbs
Heating Specifications
Height 47 in.
Width 25-1/2 in.
Depth 35-1/2 in.
Weight 350 lbs.
Dimensions
1BTU output will vary depending on the quality and type of fuel. Use PFI listed fuels for the best results.
2Heating capacity will vary depending on floor plan layout of your home, degree of insulation, and the outside temperature.
3Fuel size may effect the actual rate of fuel feed and burn times. Fuel feed rates may vary by as much as 20%. Use PFI listed fuel for best results.
Electrical Rating 110-120 volts, 60 HZ, 8.0Amps
Watts (operational) 960 (max. approx.)
Electrical Specifications
SAFETYAND EPACOMPLIANCE
Your American Harvest Furnace has been safety tested and listed to CAN/CSA B366.1, and (UM) 84-HUD, by OMNI-
Test Laboratories, Inc. Beaverton, Oregon, USA. It is also exempt from EPAPhase II requirements.

USSC 5
Fuel Considerations
SHELLED CORN (Dry, preferably corn with 11% or less moisture content)
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Optimum moisture content of corn should be 11% or less. Wetcornwill rapidly deteriorate furnace components,
reduce efficiency and void all warranties. Purchase a moisture tester if in doubt.
Corn must be clean and free from debris. Never burn corn right from the field. Damage caused by dirty corn is not
covered by the product warranty. Ask for clean filtered bagged corn only. Stalk parts, excessive fines and cob
remnants will clog the auger.
NEVER BURN SEED CORN IN YOUR FURNACE. Seed cornis treated with chemical pesticidesthat are harmfulor
fatal if swallowed, therefore, seed corn is dangerous to have in the house, especially where children can reach it.
Never burn “Deer Corn.” It frequently contains molasses/sugars.
Store your corn supply in a dry place and keep bags or container sealed to prevent your corn from absorbing excess
moisture. Test the moisture content periodically to ensure the proper dryness.
There are many varieties of corn grown around the world. Each variety has unique characteristics including the
shape and size of the kernel. Your furnace will burn more consistently with a small to midsize kernel corn. If the
kernelsize of the cornvariesgreatly or ifyouswitch sources frequently, you willget a less consistentburn. Therefore,
purchasingcorn from the same source will helpachieve a moreconsistent burn. DO NOT USE CORN WITH AHIGH
WAX CONTENT!
Oyster shell is highly recommended fro best burn operations and to reduce clinker build-up
WOOD PELLETS
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Aswith corn, be consistent in your pelletsupplier. Pelletswill vary in contentand burn characteristicsfrom supplier to
supplier. A consistent supply of pellets will result in a more consistant and effencient burn.
Check your pellets for foreign objects. Your furnace warranty will not cover damage done to your furnace due to
foreign objects in the fuel supply.
Store your pellets in a dry place to prevent them from absorbing added moisture.
To decrease sawdust buildup, the hopper will need to be vacuumed out after every 6-8 bags of pellets or more often
if the pellets are poor quality. You may have to screen each bag of pellets if sawdust becomes a problem.
Wood Pellets vary in size and ash content from less than 1% to 3% or more. Your furnace will burn more efficiently
with small to midsize pellets. Low ash content pellets will allow you to burn the furnace longer between cleanings.
Only wood pellets manufactured to theAssociation of Pellet Fuel Industries (A.P.F.I.) standard for residential pellet
fuels are recommended. Performance will suffer if nonstandard pellets are used. Consult your local American Har-
vest reseller for more information on approved wood pellet fuel.
CAUTION: DO NOT PLACE SUCH FUELS WITHIN THE SPACE HEATER’S INSTALLATION
CLEARANCES OR WITHIN THE SPACE REQUIRED FOR CHARGING AND ASH REMOVAL.

6USSC
INSTALLATION OPTIONS
Read this entire manual before you install and use your Multi-Fuel Furnace. Failure to follow instructions
may result in property damage, bodily injury, or even death!
(See specific installation details for clearances and other installation requirements)
As a Primary Furnace—the unit functions independently of any other system. The “Room Air” blowers will come on
when the plenum and Exhaust temperatures reach a preset point on the furnace’s circuit board (PCB). Unit may also be
used as a stand-alone shop heater
As a Secondary (Add-On) Furnace—the unit aids an existing gas/electric furnace helping cut down on operation time.
Itis recommended thatonly a authorized technician installyour Multi-Fuel Furnace,preferably an NFIcertified specialist.
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Installation
IMPROPER INSTALLATION: The manufacturer will not be held responsible for damage caused by the mal-
function of a furnace due to improper venting or installation. Call [phone] and/or consult a professional
installer if you have any questions.
FLOOR PROTECTION
This unit must be installed on a non-combustible floor surface. If a floor pad is used, it should be ULlisted or equal. The
floorpadornon-combustible surface should be large enough toextend a minimum of 6-inches in front, 6-inches oneach
side, and 1-inch behind the furnace for horizontal termination.
Floor protection must extend under and 2-inches to each side of the chimney tee for an interior vertical termination.
A Floor Protector of 1 inch thick is recommended for this installation.
ADDITIONAL ITEMS NEEDED FOR INSTALLATION
• UL listed 3 inch or 4 inch (Depending on application) “PL” pellet venting exhaust system.
• Air distribution duct work. Transition from 4.5 inch x 18.5 inch rectangle to 10 inch round is provided.
• Air filter (Optional). Size: 10 x 20 x 1
• Floor Protection (If not installed on a non-combustible floor)
• Air return vent from the house to the room where furnace is installed.
• Fresh air for combustion if located in a small, tightly constructed room.

USSC 7
Installation
CLEARANCES
NOTE: Distance on the left-hand side of your Multi-Fuel Furnace is set at 24 inches for suitable access to the
control panel and for fuel loading. This distance may be less, but not less than 7 inches.

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Installation
VENTING REQUIREMENTS
Install vent at clearances specified by the vent manufacturer.
Do not connect the pellet vent to a vent serving any other appliance or furnace.
Do not install a flue damper in the exhaust venting system of this unit.
Thefollowing installation guidelines must be followed to ensure conformity with boththe safety listing of this furnace and
to local building codes.
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IMPORTANT! This unit is equipped with a negative draft system that pulls air through the burn pot and
pushes the exhaust out of the dwelling. If this unit is connected to a flue system other than the way ex-
plained in this manual, it will not function properly.
MAXIMUM VENTING DISTANCE
Installation MUST include at least 3-feet of vertical pipe. This will create some natural draft to reduce the possibility of
smoke or odor during appliance shutdown and keep exhaust from causing a nuisance or hazard by exposing people or
shrubsto high temperatures. The maximum recommend vertical venting height is 12-feet for3-inch type “PL” vent.Total
length of horizontal vent MUST NOT exceed 4-feet. Use no more than 180 degrees of elbows (two 90-degree elbows,
or two 45-degree and one 90-degree elbow, etc.) to maintain adequate draft.
PELLET VENT TYPE
AUL listed 3-inch or 4-inch type “PL” pellet vent exhaust system must be used for installation and attached to the pipe
connectorprovided on the back ofthe furnace (use a 3-inch to 4-inchadapter for 4-inch pipe). Use 4-inchvent if the vent
height is over 12-feet or if the installation is over 2,500 feet above sea level.
We recommend the use of Simpson Dura-Vent®or Metal-Fab®pipe (if you use other pipe, consult your local building
codes and/or building inspectors). Do not use Type-B Gas Vent pipe or galvanized pipe with this unit. The pellet vent
pipe is designed to disassemble for cleaning and should be checked several times during the burning season. Pellet
vent pipe is not furnished with the unit and must be purchased separately.
PELLET VENT INSTALLATION
The installation must include a clean-out tee to enable collection of fly ash and to permit periodic cleaning of the exhaust
system. 90-degree elbows accumulate fly ash and soot thereby reducing exhaust flow and performance of the furnace.
Each elbow or tee reduces draft potential by 30% to 50%.
All joints in the vent system must be fastened by at least 3 screws, and all joints must be sealed with HI-TEMP RTV
silicone sealant to be airtight. The area where the vent pipe penetrates to the exterior of the home must be sealed with
silicone or other means to maintain the vapor barrier between the exterior and the interior of the home.
Vent surfaces can get hot enough to cause burns if touched by children. Noncombustible shielding or guards may be
required.
PELLET VENT TERMINATION
Do not terminate the vent in an enclosed or semi-enclosed area, such as; carport, garage, attic, crawl space, under a
sundeck or porch, narrow walkway, or any other location that can build up a concentration of fumes.
The termination must exhaust above the outside air inlet elevation.
The termination must not be located where it will become plugged by snow or other materials.

USSC 9
Installation
VENT TERMINATION CLEARANCES:
A ----- Minimum 4-foot clearance below or beside any door or window that opens.
B ----- Minimum 1-foot clearance above any door or window that opens.
C ----- Minimum 3-foot clearance from any adjacent building.
D ----- Minimum 7-foot clearance from any grade when adjacent to public walkways.
E ----- Minimum 2-foot clearance above any grass, plants, or other combustible materials.
F ----- Minimum 3-foot clearance from a forced air intake of any appliance.
G ----- Minimum 2-foot clearance below eaves or overhang.
H ----- Minimum 1-foot clearance horizontally from combustible wall.
I ------ Mustbe a minimumof 36-inches above the roof and 24-inchesabove the highest point of the roof within 10-feet.
VENT TERMINATION CLEARANCES

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Installation
THROUGH THE WALL INSTALLATION (RECOMMENDED INSTALLATION)
To vent the unit through the wall,connect the pipe adapter to the exhaust motor adapter.If the exhaust adapter isat least
18-inches above ground level, a straight section of pellet vent pipe can be used through the wall.
Your furnace dealer should be able to provide you with a kit that will handle most of this installation, which will include a
wallthimblethat will allow the properclearancethrough a combustible wall.Onceoutsidethe structure,a3-inch clearance
should be maintained from the outside wall and a clean out tee should be placed on the pipe with a 90-degree turn away
from the house. At this point, a 3-foot (minimum) vertical section of pipe should be added with a horizontal cap, which
would complete the installation.
Asupport bracket should be placed just below the termination cap or one every 4-feet to make the system more stable.
If you live in an area that has heavy snowfall, it is recommended that the installation be taller than 3-feet to get above the
snowdrift line. This same installation can be used if your furnace is below ground level by simply adding the clean-out
section and vertical pipe inside until ground level is reached. With this installation you have to be aware of the snowdrift
line, dead grass, and leaves. We recommend a 3-foot minimum vertical rise on the inside or outside of the house.
The “through the wall” installation is the least expensive and simplest installation. Never terminate the end vent under a
deck, in an alcove, under a window, or between two windows. We recommend Simpson Dura-Vent®or Metal-Fab®kits.
THROUGH THE ROOF/CEILING INSTALLATION
When venting the furnace through the ceiling, the pipe is connected the same as through the wall, except the clean-out
tee is always on the inside of the house, and a 3-inch adapter is added before the clean-out tee.
You must use the proper ceiling support flanges and roof flashing (supplied by the pipe manufacturer; follow the pipe
manufacturer’s directions). It is important to note that if your vertical run of pipe is more than 15-feet, the pellet vent pipe
size should be increased to 4-inches in diameter.
Do not exceed more than 4-feet of pipe on a horizontal run and use as few elbows as possible. If an offset is required,
it is better to install 45-degree elbows rather than 90-degree elbows.
1 Vertical Cap
2 Storm Collar
3 Adjustable Roof Flashing
4 Cathedral Ceiling Support Box
5 Pipe
6 45° Elbow
7 90° Elbow
8 HorizontalCap
9 Wall Thimble
10 Black Ceiling Support Firestop Spacer
11 Single Tee with Clean-OutAdapter
12 Tee Support Bracket
13 Double Tee with Clean-Out Adapter

USSC 11
Installation
PRIMARYFURNACE
SECONDARY(ADD-ON) FURNACE
When installed as a seondary furnace, a Duct Damper must be installed between the air discarge of the Pellet furnace
and the primary (Gas, Electric, etc.). Damper must be an electric style damper in order to connect to the multi fuel
furnace’s PCB (Printed Circuit Board). See wiring diagram in this manual.

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Do not operate your furnace with the viewing door open. The auger will not feed fuel under these
circumstances and a safety concern may arise from sparks or fumes entering the room.
A working smoke detector must be installed in the same room as this product.
Hopper Lid must be closed during operation. The auger will not feed fuel if the lid is open.
HOW YOUR FURNACE WORKS
Your Multi-Fuel Furnace utilizes a inclined auger fuel feed system that is operated by a microprocessor controlled digital
circuitboard. The digitalcircuit board allows the inclined auger fuel feed system to run in a timer-based, non-continuous
cycle; this cycling allows the auger to run for a predetermined period of seconds. The auger pushes fuel up a chute
located at the front/bottom of the hopper which in turn falls through another chute into the burnpot . As fuel enters the
burn pot, outside air is drawn across the fuel and heated during the combustion process. This heated combustion air is
thenpulled through theheat exchanger bythe Draft Fan,where it is used to heat air that is drawn into the heat exchanger
system by the distribution blower.
Because a forced draft pressure is required for the combustion process inside your furnace, it is extremely important
that the exhaust system be properly installed and maintained. And, that when operating your furnace, you make sure
that the viewing door is properly sealed.
Your furnace’s heat output can vary from Hi to Low by adjusting the settings on the control panel (located on the lower
left-hand side of the furnace). The “HEAT RANGE” setting will vary the auger systems feed rate (i.e. fuel to combustion
air ratio) and has three settings, low / medium / high. This is indicated by displaying a Hr-1 thru Hr-3 under Heat Range.
Yourfurnace has two distribution “RoomAir”blowers. Fan“A” located on the leftside ofthe unit, same side as the (PCB)
PrintedCircuitBoard,will come on whenfluegastemperatures reaches the (POT) ProgrammableOperatingTemperature
(200°F) preset on the control board. During shutdown, Fan “A” will remain on until the operating temperature reaches
the preset temp. 110°F. Fan “B” will come on when plenum temperatures reach the preset (PPT) Programmable
Plenum Temperatures (95°F). The fan will remain on until the plenum temperature drops 5°F below the programmed
duct temp.
Your furnace can run efficiently over extended periods of time and at different heat output levels as long as the air/fuel
mixtureiscorrectand the fuel supplyisuninterruptedalong with proper cleaning and when maintenance is performed.
DAMPER CONTROLADJUSTMENT
Your furnace has an adjustable intake damper located behind the Backdraft Assembly just under the Feed Door. This
dampercan be adjusted for finetunning fuels to burn at optimum performanceand can help with efficiency when burning
inconsistant fuels. When burning corn, it is suggested that the damper position be on Medium to HI. When burning
wood pellets, it is suggested that the damper position be on low to medium. These conditions will vary with your type of
fuel.
Operation
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USSC 13
Heat
Range Room Fan Draft Fan Aux.
Auto
Manual
CONTROL PANEL
Turning the furnace OFF/ON, as well as adjustments for the fuel feed rate
and room fan speed are performed by pressing the appropriate button(s)
on the control panel which is located on the lower left-hand side of your
American Harvest furnace.
This unit can be changed between an automatic operation or a manual
operation. The controller comes default in the automatic mode.
Pressing the “ON” button on the control panel will begin the start-up
sequence for the furnace. Fuel will begin to feed through the auger feed
system after 3 minutes. Pressing and holding the “ON” button will rotate
the auger continuosly until button is released, which feeds additional fuel.
Pressing the “OFF” button on the control panel will cause the furnace to
enter its shut-down sequence. The fuel feed system will stop pulling fuel
from the hopper and, once the fire goes out and the furnace cools down,
the blowers will stop running.
Pressing the “Heat Range” arrows, up or down, will adjust the amount of
fuel being delivered to the burnpot.
Thedraftfan (exhaust) will comeon as soon as the “ON” button ispressed.
The fan will automatically adjust its speed in accordance to the heat range
setting. However, this speed can be manually operated by pressing the
“Draft Fan” arrows up or down. “Draft Fan” when pressed, the display will
show “Df-A”, which is automatic. Press the arrows again to adjust fan
speed. When the furnace is in the manual mode, the optional thermostat
will not properly control the unit. When adjusting the Draft Fan setting, try
only 1 setting above or below the heat setting.
The room fan(s) will come on once the unit has reached operating temperature. The room fans will automatically adjust
their speed in accordance with the heat range setting. By pressing the “Room Fan” buttons, the display will show “Rf-
A” which is automatic or how many fans are running.
The “Aux” button is forAgitator operation. When the unit is “OFF”, pressing the “Aux” arrows will rotate the agitator for
easy removal for cleaning. The agitator, when inAutomatic mode, will operate at set intervals. However, these can be
changed by pressing the arrows on the “Aux” button. The agitator can be adjusted from 0 to 9, setting “0” is off and
setting “9” is high.
The “Auger Delay” button can be used to pause rotation of the Auger and Agitator for approx. 1 minute. This can be
cancelled by pressing the “ON” button.
The “Mode” button is used to switch between manual and automatic mode. When in auto mode, the fans, auger, and
agitator will operate at preset intervals unless changed manually using the buttons mentioned above. When in manual
mode, the draft fan (exhuast) will operate at full speed (100%), so the air must be controled with the damper just below
the viewing door.
During normal operation, the unit is constantly monitored for problems. In the event of an error condition, the unit will
stop and an error will be displayed. See the list of error codes found at the end of this manual.
Operation

14 USSC
SHUT DOWN PROCEDURE
Press the “OFF” button on the control panel to put the furnace in shut down mode. At this time, the red light above the
“OFF” button will illuminate. Once this is done, the auger will stop feeding fuel, but the room air blower(s) and draft fan
will continue to operate. When the internal temperature of the unit drops below the factory preset temperatures, the
room air blowers and draft fans will cease to operate. The red light will then shut off and the unit will be completely shut
down.
The hotter the unit is during its operation, the longer it will take for the furnace to complete the shut down cycle. If the
furnace stays on for more than 2 hours after pressing the“OFF” button and you are sure that the fire is out, the furnace
can be unplugged from the outlet. After approximately 10 seconds, the unit can be re-connected to the power source
and the control board will be reset.
Operation
START-UPPROCEDURE
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 it is in use.
Verify that the hopper is clean and free of foreign matter.
Verify that all of the required exhaust/inlet connections have been made in accordance with thismanual and that the
furnace is plugged into an outlet (an outlet surge protector is highly recommended).
Fillthe hopper withfuel; do not allow any part of thebag or anyother foreign materialinto the hopper, as this may jam
the auger. Ensure that all fuel matter is cleared from the hopper seating surface. Close the hopper lid.
Make sure that the furnace is in the “OFF” mode and place a small handful of wood pellets or fire starter pellets
(Pellets that already contain fire starter.) in the burnpot. Squirt a small amount of fire starter gel on the pellets. (Not
needed if using fire starter pellets.) Light the fire then wait approx. 1 minute for the fire to start burning the pellets.
NOTE: Even if you are burning corn, wood pellets make an excellant source of starter fuel.
Close the viewing door then press the “ON” button on the control pad and set the “HEAT SETTING” to Hr-1. It is
a good idea to start at a lower setting to allow the fire to stabilize, then adjust to higher settings.
The damper located on the front of the unit can be adjusted for optimum performance. Whether using wood pellets
or corn, small adjustments to the damper can make a big difference. When adjusted properly, there should be very
minimal amount of ash in the burn chamber. This also depends on the quality of the fuel used. When burning corn,
set the damper to the mid postion. (approx. 12 o’clock position)
Fuel will start feeding after three(3) minutes
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First Fire: Adjust the “HEAT RANGE” and “BLOWER SPEED” to a medium setting and allow the
furnace to operate in this manner for approximately three (3) hours (or more if necessary), allowing the
furnace to “cure out” as the paint and oils from the manufacturing process burn off. We recommend that
you open doors and windows in your home during this process.
WARNING: Never shut down this unit by unplugging it from the power source.
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UNIT PREPARATION
After carefully unpacking and reading the instructions for installing your furnace, you will need to perform the following
steps:
Attach the included spring handle to the door handle by screwing it on in a respective location.
Attach the electrical cord to the back of the furnace first; then plug it into a 110-volt outlet (an outlet surge protector
is highly recommended).

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Maintenance
Operation
DAILYOPERATION
The hopper and furnace top will be hot during operation; therefore, you should always use some type of
hand protection when refueling your furnace.
Never place your hand near the auger while the furnace is in operation.
In the event of a power outage, the furnace WILLNOT function. It is very important that unit be vented properly, as the
natural draft is needed to clear the smoke from the furnace during a power outage. If the unit was “ON” when the power
outage occurred, one of the following will take place when power is restored:
If the furnace is still warm, it will resume feeding fuel and continue to operate normally. If the fire has gone out, you
will have to press the “OFF” button and then the “ON” button again to begin a new start-up sequence.
If the furnace has cooled-off, it will reset to its “OFF” condition. At this point, you may press the “ON” button to
begin a new start-up sequence.
NOTE:The unit will also shut down in the event of an draft fan failure; if this is the case, the unit will not re-start and you
must contact Customer Service at [phone].
SAFETYAND CONVENIENCE FEATURES
Your American Harvest incorporates a safety pressure switch that helps ensure that everything is in proper working
order before feeding fuel to the burn pot. Because the furnace works using an induced draft pressure, the furnace will
not continue to operate if the viewing door is left open; or if the exhaust blower fails or the exhaust system is blocked.
The temperature limit control will prevent your furnace from operating at abnormally high temperatures. Should the
furnace temperature begin to approach the factory pre-set limit, the temperature limit control will automatically slow
down the auger feed rate until the temperature returns to a normal condition. Both room air blowers will operate at full
speed also until the furnace returns to normal operating temperatures.
If your furnace continues to cut back because it is reaching the temperature limits, reduce the “heat setting” to the next
lower setting.
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Failure to clean and maintain this unit as indicated can result in poor performance and safety hazards.
Unplug your stove’s electrical cord prior to removing the back panel or opening the exhaust system for any
inspection, cleaning, or maintenance work.
Never perform any inspections, cleaning, or maintenance on a hot furnace.
Do not operate furnace with broken glass , leakage of flue gas may result.
EXHAUST SYSTEM
The by products of combustion contain small particles of fly ash. Fly ash will collect in the exhaust venting system and
restrict the flow of flue gases. Incomplete combustion, such as during startup, shutdown, or incorrect operation of the
furnace will lead to soot formation which will collect in the exhaust system. Therefore, it is important that the exhaust
system be inspected and cleaned at least monthly during the burning season.
Check the clean out tees periodically to determine the required cleaning schedule. 3 or 4-inch chimney brushes are
available for chimney cleaning. If the exhaust system or outside air pipes have screens on them, frequently clean the
screen. Aplugged screen will shut off combustion air and cause a fire to die or burn poorly.
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INTERIOR CHAMBERS
Remove the two(2) cleanout plates on each side of the damper control. Using the cleaning tools provided, clean all ash and fuel
matter from the burn chamber. This may need to be done daily depending on fuel consumption.
Periodically remove and clean the burnpot and the area inside the burnpot housing. In particular it is advisable to clean out the
holes in the burnpot to remove any build up that may prevent air from moving through the burn pot freely.
Placing the Burnpot and the Agitator in a bucket of water and allowing to soak will help with the clinker build-up and removal.
Remove the two cleanout slides on each side of the burnpot at the rear of the burn chamber to clean out all ash.
Remove the hearth and clean out the exhaust duct of all ash.
If a vacuum is used to clean your furnace, we suggest using a vacuum designed for ash removal. Some regular vacuum cleaner
(i.e. shop vacs) may leak ash into the room.
ASH DISPOSAL
Ashesshould beplaced in a metalcontainerwitha tightfitting lid.Theclosed containerofashes shouldbe placedon a noncombustible
floor or on the ground, well away from all combustible materials, pending final disposal. If the ashes are disposed of by burial in soil
or otherwise locally dispersed, they should be retained in the closed container until all cinders have been thoroughly cooled.
CHECK AND CLEAN THE HOPPER
Check the hopper periodically to determine if there is any fuel or fuel matter that is sticking to the hopper surface. Clean as
needed.
GASKETS
Inspect the main door and glass window gaskets periodically. The main door may need to be removed to have frayed, broken, or
compacted gaskets replaced by your Authorized “American Harvest” Dealer.
Also, be careful not to damage the gaskets on the backside of the cleanouts on the front of the unit. If gaskets become torn or
damaged, they must be replaced.
BLOWER MOTORS
Clean the air holes on the motors of both the draft fan and room air blowers annually. Remove the draft fan from the exhaust duct and
clean out the internal fan blades as part of your fall start-up. A new gasket may be purchased from U S Stove’s Customer Service
Department.
Replace the customer supplied air filter on the back of the furnace on a regular basis if installed.
PAINTED SURFACES
Painted surfaces may be wiped down with a damp cloth. If scratches appear, or you wish to renew your paint, contact your
Authorized “American Harvest” Dealer to obtain a can of suitable high-temperature paint.
GLASS
We recommend using a high quality glass cleaner. Should a build up of creosote or carbon accumulate, you may wish to use 000
steel wool and water to clean the glass. In the event you need to replace the glass, only high temperature ceramic glass of the
correct size and thickness may be used. Contact your Authorized “American Harvest” Dealer to obtain this glass.
FALL START UP
Prior to starting the first fire of the heating season, check the outside area around the exhaust and air intake systems for obstructions.
Clean and remove any fly ash from the exhaust venting system. Clean any screens on the exhaust system and on the outside air
intake pipe. Turn all of the controls on and make sure that they are working properly. This is also a good time to give the entire
furnace a good cleaning throughout.
SPRING SHUTDOWN
After the last burn in the spring, remove any remaining fuel from the hopper and the auger feed system. Scoop out the fuel and
then run the auger until the hopper is empty and fuel stops flowing (this can be done by pressing the “ON” button with the viewing
door open). Vacuum out the hopper. Thoroughly clean the burnpot, and firebox. It may be desirable to spray the inside of the
cleaned hopper with an aerosol silicone spray if your furnace is in a high humidity area. The exhaust system should be thoroughly
cleaned.
YEARLYSERVICING
A yearly servicing and cleaning by your Authorized “American Harvest” Dealer is recommended. A fee may be charged for this
service.
Maintenance

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Parts Diagram

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Parts List
1
5
9
8
10
12
7
4
6
11
3
2
Item Part No. Title Qty.
1 25507 Feed Door 1
2 25492 Handle, Door 1
3 83506 3/8 x 1 1/4 Roll Pin 1
4 891053 Door Glass w/o Logo 1
5 88066 5/8” Rope Gasket 4.5 ft
6 88087 Glass Gasket (1 x 1 3/16) 3 ft
7 25520 Bottom Glass Retainer 1
8 25521 Top Glass Retainer 1
PARTS LIST
Item Part No. Title Qty.
9 83278 Washer 4
10 83202 MachineScrew 4
11 89574 Spring Handle 1
12 25393 Retainer, Glass (Alternate For 7 & 8) 1
N/S 25080MB Door Latch 1
N/S 83508 5/16-18 x 1-3/4 Bolt 1
N/S 83338 5/16-18 Lock-Nut 1
N/S - Not Shown
Item Part No. Title Qty.
1 891282 Assembly, Hopper 1
2 891267 Access Panel, Back 1
3 891266 Filter Guide, Bottom 1
4 891265 Filter Guide,Top 1
5 891287 Assembly, Lid 1
6 891247 Assembly, Top Cover 1
7 891292 Side Panel, Right 1
8 891251 Weld., Left Side Panel 1
9 69524 Assembly, Feed Door 1
10 25080 Latch, Door 1
11 83508 5/16-18 x 3/4 Bolt 1
12 83338 5/16-18 Lock Nut 1
13 891262 Baffle 1
14 891319 Damper 1
15 83206 5/16-18 Hex Nut 1
16 891283 Cleanout,Ash 2
17 891290 Flap, Backdraft 2
18 891289 Housing, Backdraft 1
19 891291 Rod, Flap 2
20 83550 Fastener, Pushnut (0.125 Dia. Stud) 4
21 891238 Door, Ash Cleanout 1
22 88125 Gasket,Ash Cleanout 2
23 83551 Wing Nut, 1/4-20 Brass 4
24 891250 Hearth Plate 1
25 88124 Gasket, Exhaust Cleanout 1
26 891187 Brkt, Pressure Switch/PCB 1
27 80478 Pressure Switch 1
28 83537 Hose Clamp (#4) 1
29 83905 3/4” Snap Bushing 2
30 891121 Hose, Silicone 1 FT
31 89586 Nipple,Auger 1
32 891258 Weldment, Burnpot 1
33 891249 Agitator 1
34 83901 Hairpin 2
35 88111 Gasket,Agitator Bracket 1
- 891232 Assy, Agitator Bracket (Items 36, 37, 38) 1
Item Part No. Title Qty.
36 83534 Retaining Ring 3
37 891220 Mounting Bracket for 3/4” Bushing 1
38 891132 3/4” Bushing 3
39 86620 Agitator 1
40 83901 Roll Pin 1
41 80488 DriveMotor 1
42 25427 Retainer,AgitatorMotor 1
43 891284 Access Panel, Agitator Motor 1
44 80495 120 CFM Blower 1
45 88123 Gasket, Blower 120 CFM 1
46 80480 Thermistor 1
N/S 80501 Thermistor (Long Lead) 1
47 891300 Transition, Exhaust Blower 1
48 89319 Gasket, Blower 2
49 80230 500 CFM Room Blower 2
- 80496 500 CFM Room Blower (Sealed Ball Bearings) -
50 891269 Assy, Auger Housing 1
- 69513 Assy, Bushing Retainer Bot. (Items 51, 36, 38) 1
51 891190 Plate, Bottom Bushing 1
52 891189 Plate,Top Bushing 1
53 80488 Motor, Drive 1
54 891195 Bracket, Drive Motor 1
55 891169 Hose, Heater 2
56 891141 Auger 1
57 891248 Weldment, Bottom Plate Retainer 1
58 891180 Cover,Auger 1
59 80462 Recepticle, 3 Prong 1
60 80461 Cord, Power Supply 1
61 891296 Transition Duct, 10” Round 1
62 80498 Assembly, Circuit Board 1
63 80491 Micro-Switch,Hopper Lid 1
64 891327 Latch, Mini-Lift & Turn 2
N/S 80497 Wiring Harness, Main 1
N/S 80499 Wiring Harness, Lid Switch 1
N/S = Not Shown

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Wiring Diagram

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Trouble Shooting
PROBLEM CAUSE: Not enough combustion air; Fuel has to much moisture.
Viewingwindow becomingblackshortly
after start-up. •Adjust the air damper to a more open position.
•Use a fuel with less moisture content
PROBLEM CAUSE: Not enough combustion air; Fuel has to much moisture.
“Black Popcorn” is present in the burn
chamber. •Adjust the air damper to a more open position.
•Use a fuel with less moisture content
•Stove might be cycling excessively due to temperature cut backs.
•Reduce heat setting
PROBLEM CAUSE: Chemical reaction between the starch in corn and the heat.
“Clinkers” form in burnpot. •Add calcium carbonate (aka chicken scratch or oyster shell).
•Adjust air mixture
• Use corn with less moisture or starch.
PROBLEM CAUSE: Unit is reaching the “Almost Over-temp” preset.
Unit cycles up and down when on the
“HIGH” heat setting. •Adjust the heat range to lower setting.
•Fuel burns hot causing the furnace to cycle between high setting and
lower settings.
Disconnect the power cord before performing any maintenance! NOTE: Turning the ON/OFF Switch to
”OFF” does not disconnect all power to the electrical components of the furnace.
Never try to repair or replace any part of the furnace unless instructions for doing so are given in this
manual. All other work should be done by a trained technician.
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PROBLEM CAUSE: To rich air/fuel mixture
Orange, lazy flame_excessive fuel
build-up in the burnpot •Clean out the burnpot and burnpot housing
•Adjust the air damper on the front of the furnace to an open postion.
•Make sure that the viewing door is closed and sealed properly. If not,
check door gasket..
•Check that all outside connections are clear of any obstructions.
•Check the exhaust system; clean as needed.
PROBLEM CAUSE: Burnpot burns out of fuel
Fire goes out or furnace shuts down. •Hopper is empty, refill the hopper.
•Loss of draft pressure. Make sure that the viewing door is closed and
sealed properly. Check that all outside connections are clear of any
obstructions. Check the exhaust system; clean as needed.
•Check that the pressure switch connection to the firebox is free of ash or
clear of obstructions.
•Auger system is jammed or there is a “bridging” of the fuel in the hopper,
preventing fuel from flowing into the auger feed system.
• Stove may be shutting down to an over temperturem condition.