United States Stove Company

227 Industrial Park Rd.

South Pittsburg, TN 37380

853119-1205H

Wood Only Central Furnace

Owner’s Operation and Instruction Manual

MODEL: AF1300E

SAVE THESE INSTRUCTIONS

THIS MANUAL WILL HELP YOU TO OBTAIN EFFICIENT, DEPENDABLE SERVICE FROM THE HEATER, AND ENABLE YOU

Installation is to be preformed by a qualied

installer. SAVE THESE INSTRUCTIONS

Certied to UL 391 (R2014), and to CSA B366.1-

11 (R2015) with the Thermostatically Controlled

Damper Kit installed

U.S. ENVIRONMENTAL PROTECTION AGENCY

For your safety, follow the installation instructions.

Never use make-shift compromises during the

installation of this unit. Contact local building or re

ofcials about permits, restrictions and installation

Please read this entire manual before you install or

use this unit. Failure to follow instructions may result

in property damage, bodily injury, or even death.

Improper Installation Could Void Your Warranty!

Combustible: Wood

Flue Pipe Diameter: 6” (153mm)

Flue Pipe Type: (Standard,

Combustion Chamber:

Width x Depth:

12.8” X 20.3”

Volume:

Cubic Feet:

3.0 cubic feet

Door Opening: Width x Height: 11.6” X 11.5”

Weight (lbs): 350lbs

CONGRATULATIONS!

heaters sold after May 15, 2016. Under specic EPA test conditions this heater has been

shown to deliver heat at a rate of 18,850 – 56,000 BTU/hr. This heater achieved a particulate

emissions rate of 0.509 lb/mmBtu when tested to method CSA B415.1-10 (*and an overall

efciency of 60.01 %). The maximum overall heat output of this heater was tested to be

89,000 Btu/hr.

This wood heater has a manufacturer-set minimum low burn rate that must not be altered. It is against federal

regulations to alter this setting or otherwise operate this wood heater in a manner inconsistent with operating

instructions in this manual.

The operation of this wood heater in a manner inconsistent with the owner’s manual will void you warranty and

is also against federal regulations.

• WARNING: Do not operate with fuel loading or ash removal doors open.

• Do not connect this unit to a chimney ue serving another appliance.

• WARNING DANGER: Risk of re or explosion. Do not burn garbage, gasoline, naphtha, motor oil, or other

• WARNING: Risk of re. Do not operate with ue draft exceeding .060” water column/14.93 Pascals. Do not

• CAUTION: Hot surfaces. Keep children away. Do not touch during operation.

• The heat exchanger, ue pipe, and chimney must be cleaned regularly to remove accumulated creosote

• Do not leave the furnace unattended when the door is slightly opened.

• Do not burn garbage, ammable uid such as gasoline, naphtha or motor oil.

• Always close the door after the ignition.

• Consult your municipal building department or re ofcials about permits, restrictions and installations

• INSPECT FLUE PIPES, FLUE PIPE JOINTS, AND FLUE PIPE SEALS REGULARLY TO ENSURE THAT SMOKE AND FLUE

• CAUTION: CLEAN OUT OF THE HEAT EXCHANGER, FLUE PIPE CHIMNEY, AND DRAFT INDUCER, IF USED, IS

ash plug are positioned correctly and not broken (see

illustration for proper brick arrangement).

The following is a list of tools and materials needed to

install your furnace.

• 7/16” socket wrench.

• 5/16” socket (Best if using a power drill and a socket

• Pair of pliers or channel-locks.

• Power drill with an 1/8” drill bit to install sheet metal

• Electrical wiring tools and supplies.

• Ductwork for supply and return air.

non-combustible, continuous solid surface to protect against inltration of

live embers and ash. Floor protection must have and R-Value of at least 1.4.

Refer to oor protector manufacturer’s instructions for installation directions.

The oor protector or non combustible oor must extend under the furnace

and beyond each side as shown below.

efcient method of installation. This furnace can be installed in two ways,

as a stand alone or parallel unit, with an existing furnace.

The warm-air supply duct shall be constructed of metal in accordance with

NFPA 90B, 2-1.1. The plenums installed to the furnace shall be constructed

of metal in accordance with NFPA 90B, 2-1.3. When installing this furnace

the hot air plenum is to have a minimum height of 24” (610mm) if the top

of the rst vertical section is not ush with the top of the rst horizontal

section of ductwork. If the top of the plenum is ush with the top of the rst

horizontal section of ductwork then the minium height is 15” (381mm).

and all instructions in this manual are followed, including clearance to

combustibles, oor protector specications and safety warnings.

Your furnace requires the following items to be assembled or installed

by the service person:

Blower and Blower Control

Electrical Connections

to each of the wire leads. Plug the wires to the thermodisc. NOTE:

It does not matter which of the two wires plugs to which terminal

on the thermodisc.

3. Remove blower from cartons. Remove junction box cover.

Attach clip nuts as in gure shown. Install blower(s) and gasket(s

with 1/4"-20 x 3/4" bolts as shown.

4. Refer to the wiring diagram for instructions on how to properly

wire the components.

Using two 1/4-20 x 1-1/4”

should swing freely back into

the furnace.

Use the two included bolts and nuts to secure the handle to the stove as shown.

Note: Adjust the handle as needed to insure a proper seal.

All electrical connections should be done by a qualied electrician

It is recommended to connect the furnace to its own 15 amp 120 Volt circuit from the house power supply

NOTE: Wire leads from the distribution blower are usually BOTH BLACK. Makes no difference which leads from

the motor(s) connects to the corresponding leads coming out of the conduit.

Higher efciencies and lower emissions generally result when burning air dried seasoned hardwoods, as

compared to softwoods or to green or freshly cut hardwoods.

DO NOT BURN:

1. Garbage;

2. Lawn clippings or yard waste;

3. Materials containing rubber, including tires;

4. Materials containing plastic;

5. Waste petroleum products, paints or paint

6. Materials containing asbestos;

saturated materials;

particleboard. The prohibition against burning

these materials does not prohibit the use of re

starters made from paper, cardboard, saw dust,

these logs at the same time. Start with one manufactured log and see how the stove reacts. You can increase

the number of logs burned at a time to making sure the temperature never rises higher than 475 °F (246 °C) on a

magnetic thermometer for installation on single wall stove pipes or 900 °F (482 °C) on a probe thermometer for

installation on double wall stove pipe. The thermometer should be placed about 18” (457 mm) above the stove.

Higher temperatures can lead to overheat and damage your stove.

Dead wood lying on the forest oor should be considered wet, and requires full seasoning

time. Standing dead wood can usually be considered to be about 2/3 seasoned.

Splitting and stacking wood before it is stored accelerates drying time. Storing wood on

an elevated surface from the ground and under a cover or covered area from rain or

snow also accelerates drying time. A good indicator if wood is ready to burn is to check

materials should be burned.

Waste and other ammable

materials should not be

burned in your furnace. DO

DO NOT BURN GARBAGE,

GASOLINE, NAPTHA, ENGINE

MATERIALS. Any type of wood

NOTICE: To minimize the risk of smoke spillage when opening the door with a re in your furnace, crack

the door open no more than 1” and wait for at least 10 seconds before opening it more to allow pressure

stabilization inside the furnace.

When the furnace is thoroughly warmed, place one piece of split wood (about ve inches in diameter) parallel

to the door on the bed of red embers.

Adjust all air controls to there maximum settings and close the door. If ignition of the piece is accomplished

within 90 seconds from the time if was placed in the furnace, your wood is correctly dried. If ignition takes longer,

your wood is damp.

If your wood hisses and water or vapor escapes at the ends of the piece, your wood is soaked or freshly cut.

Make sure that there’s enough air circulation while curing the furnace. DO NOT connect your furnace to the

duct work during this curing process. The odors could be smelled during the 3 or 4 rst res. Never start your

furnace outside. You will not be able to see if you are over heating.

1. Make sure that your furnace has been installed as per the instructions outlined in this manual and the proper

power is supplied to it.

2. Open the fuel loading door.

3. Note: If there already is a bed of hot/glowing coals in the combustion chamber, proceed directly to the

Preheating step.

4. Place several pieces of small dry kindling in the front of the combustion chamber directly on the rebricks.

No chemical product should be used to light the re.

1. Once the kindling is burning well or the glowing coal bed is stirred up, lay 2 or 3 pieces of well-seasoned

cordwood down so that the ame from the kindling re can circulate around the logs and close the door.

Note: You may need to add more kindling to help ignite the cordwood.

2. Before loading your furnace fully you will want a well-established re in the combustion chamber. This

typically takes 15-20 minutes.

It is EXTREMELY IMPORTANT that you use DRY WOOD only. The wood should have dried for 9 to 15 months, such

that the humidity content (in weight) is reduced below 20% of the weight of the log. It is very important to keep

in mind that even if the wood has been cut for one, two or even more years, it is not necessarily dry, if it has

• Low energy yield

• Blackened windows

• Incomplete log combustion

Smaller pieces of wood will dry faster. All logs exceeding 6” in diameter should be split. The wood should not be

stored directly on the ground. Air should circulate through the cord. A 24” to 48” air space should be left between

each row of logs, which should be placed in the sunniest location possible. The upper layer of wood should be

protected from the elements but not the sides.

Controlled combustion is the most efcient technique for wood heating because it enables you to select the

type of combustion you want for each given situation. The wood will burn slowly if the wood furnace air intake

Once you have obtained a good bed of embers, you should reload the unit. In order to do so, open the air

controls to maximum a few seconds prior to opening the furnace’s door. Then proceed by opening the door very

slowly. Then bring the red embers to the front of the furnace and reload the unit.

For optimal operation of your wood furnace, we recommend you to operate it with a wood load approximately

equivalent to the 3/4 of the height of re bricks.

It is important to note that wood combustion consumes ambient oxygen in the room. In the case of negative

pressure, it is a good idea to allow fresh air in the room, either by opening a window slightly or by installing a fresh

air intake system on an outside wall.

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

smoke exhaust system. The ideal temperature for these gases is somewhere between 275°F and 500°F. Below

these temperatures, the build-up of creosote is promoted. Above 500 degrees, heat is wasted since a too large

quantity is lost into the atmosphere.

Always burn dry wood. This allows clean burns and higher chimney temperatures, therefore less creosote deposit.

Leave the air control full open for about 5 min. every time you reload the furnace to bring it back to proper

operating temperatures. The secondary combustion can only take place if the rebox is hot enough.

Always check for creosote deposit once every two months and have your chimney cleaned at least once a

year. If a chimney or creosote re occurs, close all dampers immediately. Wait for the re to go out and the

heater to cool, then inspect the chimney for damage. If no damage results, perform a chimney cleaning to