United States Stove 30A User Manual

Wood & Coal Burning Furnace

Owners Manual

Models: 24A, 30A

TESTED TO UL 391

All installations must be made in accordance with local and state codes

which may differ from this manual.

UNITED STATES STOVE COMPANY

227 Industrial Park Road

P.O. Box 151

South Pittsburg, TN 37380

USSC Page 1851731

CHIMNEY INSTALLATION

Your new furnace must be installed into a "Class A" Chimney
only. This type of chimney consists of a flue lined brick chimney,

or an approved "Class A" all fuel factory built (prefabricated)
type. Any other installation guarantees an immediate fire haz­ard.

Do not install the furnace into the same chimney serving other
appliances.

When using 8" flue pipe, the chimney should have an 8" to 10"
round flue liner or 9"x9" square liner.

The chimney should have a minimum height of 3' from the top of
the chimney to the point at which it passes through the roof.

The top of the chimney must be at least 2' higher than the peak
or the highest portion of the roof within 10' horizontally.

A chimney that rises within the house is better insulated than a
chimney that is located outside the house and exposed to the
weather, the north side of the house is the worst position.

Check manual for proper installation of flue pipe into chimney.

FURNACE INSTALLATION

Install your furnace as close to the chimney as possible with a
minimum of elbows, no more than two and a flue pipe run of no
more than 6 feet horizontally. Also, the flue pipe should contain
a 1/2" rise per foot and NEVER be installed closer than 18" from
combustibles.

WOOD BURNING: Install a manual flue pipe draft damper at a
safe, convenient location between your furnace and chimney.

COAL BURNING: Install a barometric damper set at .05 Water
Column.

AIR FLOW: Solid Fuel furnaces produce much hotter air than oil
or gas fired appliances so all clearances are mandatory.

AIR DUCT INSTALLATION: This furnace provides a 12" round (113
sq. in.) opening, because of efficiency and general conve­nience.

United States Stove Company recommends a Parallel Furnace
Installation with direct (ducted) feed or return air to your fur­nace. NOTE: Cold air duct intake must be at least 25% larger
than hot air duct outlet.

FURNACE ASSEMBLY

U.S. Stove provides easy step by step pictures, therefore, the
furnace assembly procedure should be understandable.

FIRING YOUR FURNACE

Start on a conservative basis. Your new furnace, when properly
fired with hard dry wood will achieve approximately 6 to 8 hours
of burn time per load of wood, much longer with coal. If the
furnace is being fired hot constantly with full flames and only
provides a 3 hour burn cycle, the furnace is being overfired.
Possibly your heating requirements are too much for the size of
furnace purchased. Certainly allowing your existing furnace to
assist in extremely cold weather is no crime. Remember, your
furnace can be damaged if fired continually at extremely high
temperatures and this procedure will void your warranty.

CAUTION: OVERFIRING YOUR
FURNACE VOIDS WARRANTY.

OVER FIRING

This generally occurs when the following procedures are not
followed, ash door is open (even partially open), the feed
door pressure relief flap is open, the feed door is open or the
manual draft spinner is open. Open the ash and feed doors
only when in attendance, never leave the furnace unattended
when doors are open. This furnace has an automatic draft
fan so use the manual draft with a specific purpose. Also, an
overfilled ash drawer can cause grate warpage, keep ash
drawer clean. Don't use furnace if distribution fan isn't func­tioning properly, and keep air filter clean. Draft fan opening
should be set at 1/2" open as a point of start, depending on
condition of fuel.

U. S. Stove recommends a very active fire at all times for maxi­mum results, but only as instructed.

SOME HELPFUL HINTS

•Your furnace will hold logs approximately 2" shorter than the
length of the firebox. Don't force in oversized logs.

•Unsplit, dry logs will provide longer burn time than split logs.

•Don't ever try to burn trash or garbage.

•Keep flue pipe stack temperature between 300 and 400
degrees. This will reduce creosote build-up. A magnetic sur­face thermometer can be obtained from your dealer.

•Weather is the most important determinant in how you oper­ate your furnace (assuming you have dry wood).

•The colder it is the stronger the draft, warm weather reduces
draft. Set your draft fan rheostat and manual draft accord­ingly.

•Open manual smoke damper only when starting the fire and
when chimney draft is marginal.

•Always place logs so air can flow between them.

•Shake gently (up to 10 o'clock down to 8 o'clock) don't try to
loose weight shaking down ashes!

•Wood ash is useful as a fertilizer because it contains potas­sium, ashes also decrease the acidity of the soil. Coal ashes will
provide good traction on ice or snow, otherwise they are use­less.

•Always store ashes in a metal container with a lid.

•Ashes are a good thermal insulator and will keep enough
oxygen away so embers will not burn out.

•Never, never let ashes accumulate up to grate level, this will
greatly reduce the life span of your grate.

•Coal produces much more ash than wood.

•Keep your chimney and flue pipe clean, check monthly.

•Smoke detectors and fire extinguishers should always be a
part of your equipment.

•Never use chemicals or fluids such as gasoline, charcoal lighter,
drain oil or kerosene to light a fire.

•Oil the air fan motors yearly. They do not contain bearings,
sleeves with felt. Therefore keeping fan air clean is more impor­tant than oiling.

•Turn on your regular furnace once every month to keep it
tuned up.

•Always shut the furnace down gradually to prevent exces­sive stress on steel.

WARPAGE OF STEEL IS COMMON, AGGRESSIVE BUT GENTLE FIR­ING CAN MINIMIZE WARPAGE.

•There is no substitute for dry hard wood. Wood requires 6
months to a year to air dry to 25% moisture content or less.

•Don't throw heavy, wet wood into your Jensen, it could crack
the firebox and bricks.

•Treat your furnace with the proper respect and it will reward
you with much comfort, and a lifetime of central heat.

Page 2 USSC

WELCOMEWELCOME

WELCOME

WELCOMEWELCOME

...to the world of solid fuel heating! Your new furnace has been designed
and built with a high grade of materials and the strictest regard to quality.

Before you start installing your new furnace, take the time to read these instal­lation and operating instructions. We have prepared them for your benefit to
save time and provide some helpful knowledge on wood and coal burning.

Save the instructions for future use. It won't take long for you to realize the
benefit of solid fuel heating, however, maintenance is the key to a long last­ing relationship with your new furnace. These instructions can help you now
as well as in the future.

Note: This owners manual is provided for Forced Air add on furnaces. United
States Stove Company is constantly developing and improving its product
line, therefore, we reserve the right to change specifications without notice.

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General Rules ............................................................................................................................................................4

How It Works ..............................................................................................................................................................5

Installation Instructions ...........................................................................................................................................6-9

Assembly ............................................................................................................................................................. 10-14

Control Box and Electrical Components .............................................................................................................15

Operation ........................................................................................................................................................... 15-19

Accessories .............................................................................................................................................................. 19

Trouble Shooting .....................................................................................................................................................20

Parts List & Diagram ........................................................................................................................................... 21-22

Wiring Schematic .................................................................................................................................................... 23

How To Order Repair Parts ..................................................................................................................................... 24

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GENERAL RULESGENERAL RULES

GENERAL RULES

GENERAL RULESGENERAL RULES

Rules for the Safe Installation and Operation of Your
Furnace...

Check local codes, the installation must comply with
strict conformance in regard to clearances.

The Furnace must be installed on a noncombustible
floor.

Connect the furnace to tile lined inside masonry chim­ney or approved insulated all fuel prefabricated chim­ney only.

Keep smoke pipe connection as short as possible,
using a minimum 24 gauge pipe with a minimum 1/2"
per foot rise from the flue collar to the chimney open­ing.

Be sure there is a sufficient supply of combustion air
to the area where the furnace is to be located.

Do not over draft the furnace! It is designed to oper­ate at .04 to .06 inches of water column and must be
set with a draft gauge to maintain a steady draft.

Do not use flammable liquids for starting a fire.

The furnace is designed to burn air dried wood and
coal at a predetermined firing rate. Over firing could
result in damage to the heat exchanger and cause
dangerous operation. Over firing occurs when the
ash door is left open during operation or a highly
volatile fuel, such as large amounts of small kindling,
is used. Note: This action voids all warranty.

Follow a regular service and maintenance schedule
of the furnace and chimney for efficient and safe op­eration.

Do not leave the ash door open when the fire is burn­ing.

Do not let ashes build up closer than 2" to the grate.

With new steel, there is a small amount of oil or dirt
on the metal. You may smell an odor. This is normal
during the first operation. You should assemble the
furnace out of doors and build a small fire in it to
"burn off" this dirt and oil before installing the unit.

During the first few fires, heat may slightly warp the
front and back panels. This is normal and will not
hamper your unit's operation.

Do not store fuel or combustibles near the furnace.
Some areas of the furnace are hot and could cause
an explosion and possible bodily or property dam­age.

Store all ashes in a metal container with a tight seal­ing lid and allow ashes to cool before disposing of
them, possibly a week.

Familiarize yourself with the furnace's solid fuel burn­ing characteristics before leaving unit unattended for
long periods of time.

The loading door and ash door must be tightly closed
during furnace operation to insure safety and effi­ciency.

CAUTION ­The furnace has hot surfaces. Keep Children Away.
Do not touch during operation.

In the event of a chimney fire call the fire depart­ment, then be sure the furnace doors are closed
tightly and the power to the unit is turned off.

DO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE
SERVING ANOTHER APPLIANCE.

BURN WOOD OR COAL ONLY THESE MODELS. DO NOT
MIX OTHER THAN THE USE OF WOOD TO START A COAL
FIRE.

DANGER - Risk of Fire or Explosion: Do not burn gar­bage, gasoline, drain oil or other flammable liquids.

WARNING - Risk of Fire:

Do not operate with flue draft exceeding 6 inches wa­ter column.

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

Do not store fuel or other combustible material within
marked installation clearances.

Inspect and clean flues and chimney regularly.

In case of a power failure, remove the filter from the

cold air return box if equipped. Do not expect to
keep your home at normal temperatures. Do not
load fuel above the botom of the feed door.

This Furnace Must Be Installed By A Qualified Installer.

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HOWHOW

HOW

HOWHOW

How Your New Furnace Works

Unlike conventional heating (gas, oil, electric), wood
or coal heating requires more user attention. Your
furnace, with its automatic combustion air blower,
alleviates the constant need for adjusting the burn­ing rate common to other units on the market. The
fire, however, must be started and subsequent fuel
added by the user.

Conventional heating system produce heat only
when the thermostat calls for heat. This way of heat­ing is inefficient and often leaves part of the home
either too hot or too cold. Your furnace is designed
to deliver heat as long as there is a fire in it. The fire
intensity is regulated by the room thermostat, high or
low, the fire continues to produce heat. This heat is
continuously distributed throughout the home by a
distribution blower. This constant supply of heat is
uniform and prevents drafts.

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WARNING

Note: Improper firing. Wood or coal over firing

occurs when the ash door is left open during

operation or a highly volatile fuel is used.

Coal that exceeds the fire brick line will cause

overfiring...this type of operation will immedi-

ately void any warranty.

USSC Page 5

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Furnace location

Before you start!

It is very important you check with your dealer, local
fire department, or building inspector. They will be
able to inform you of any state or local codes per­taining to the location and installation of your fur­nace.

The ideal location for your furnace is centrally located
in the basement. This allows for an even heat distri­bution by having all the duct work approximately the
same length. Ideal locations cannot always be used
for one reason or another, therefore, let's look at some
alternatives.
If your home does not have a basement, but a utility
room or garage, make sure there is enough space to
maintain the required clearances stated on the label
located on the furnace. Also, read about combus­tion air.

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Chimney location is also critical. The furnace must
be placed as close as possible to the chimney. You
want the chimney connector (smoke pipe) to have
a minimum of elbows, two (2) or less. Also, the chim­ney connector should not have to run more than six
(6) feet to the chimney.

CAUTION: The warm-air supply outlet of the Furnace
should not be connected to the cold-air return inlet
of the central furnace because a possibility exists of
components of the central furnace overheating and
causing the central furnace to operate other than as
intended.

After installation, be sure the measured external static
pressure of the central and Furnace is not greater than
those marked on the nameplates.

INSTALLATION #1

With this installation, a back draft damper (optional)
is inserted into the heat run before the plenum of the
existing furnace to prevent air from the existing fur­nace to blow back into the furnace when it is not in
use. When a back damper is employed, it should be
located as close to the existing furnace plenum as
practical.

INSTALLATION #2

Extending the hot air duct from the furnace into the
existing plenum will help direct the flow of air from
the furnace as well as the flow in the existing furnace.
Ducting entering the existing plenum at an angle (ap­proximately 45 degrees) will facilitate air flow from
the furnace while diverting air from the existing fur­nace.

INSTALLATION #3

The baffle on this system should be made the full width
of the furnace plenum in order to properly direct the
air into the distribution ducts.

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Your furnace is designed to be added on to existing
duct work and operate either with or without another
heat source such as a gas furnace. The following
diagrams illustrate acceptable ways of ducting your
furnace.

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Clearance to Combustibles

Furnace to back wall 30"

Furnace to side wall 12"

Clearance to Combustible Materials

Your Furnace has been tested to determine the SAFE
clearances to combustible material. The clearances
are printed on the label located on the back of the
furnace. The chart on this page also states these mini­mum clearances. Make sure you follow these when
choosing your furnace location.

Any hot air plenum connection to a furnace must be
constructed of metal.

NOTE: INSTALL ONLY ON A NON-COMBUSTIBLE FLOOR.

Pipe to back wall 18"

Pipe to side wall 18"

Furnace to ceiling 30"

Ductwork to ceiling 18-6-1"

USSC Page 7

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Only a "Class A", all-fuel chimney in­tended for use with solid fuel should be
used.

"Class A" chimneys are those made from
tile-lined masonry (brick or block) or an
independent laboratory approved all­fuel factory-built chimney.

WHAT SIZE CHIMNEY SHOULD BE

The Chimney size to use is either six (6)
or (8) inch round or an 8 x 8" square. If
you use a rectangular chimney , the mini­mum area it may be is 39 square inches.

CAUTION!

USED?

Page 8 USSC