Country Hearth 24A User manual

1851731B-1908E
UNITED STATES STOVE COMPANY
227 Industrial Park Road
P.O. Box 151
South Pittsburg, TN 37380
All installations must be made in accordance with local and state codes
which may differ from this manual.
Wood & Coal Burning Furnace
Owners Manual
Models: 24A, 30A
TESTED TO UL 391
Report #: 215-S-17-4
LISTED BY PORTLAND,
OREGON, USA
U.S. Environmental Protection Agency
Certified to comply with 2015 particulate emissions standards.

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...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.
WELCOME
Chimney Installation
Your new furnace must be installed into a “Class A” Chim-
ney 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 understand-
able.
Firing Your Furnace
Start on a conservative basis. Your new furnace, when
properly fired with hard dry wood will achieve approxi-
mately 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 require-
ments are too much for the size of furnace purchased.
Certainly allowing your existing furnace to assist in ex-
tremely cold weather is no crime. Remember, your fur-
nace can be damaged if fired continually at extremely high
temperatures and this procedure will void your warranty.
CAUTION: OVERFIRING YOUR
FURNACE VOIDS WARRANTY.
Overfiring
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

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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 over-
sized 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 re-
quires 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.
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 immediately void any warranty.

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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.
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.
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 ac-
tion 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 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 gar-
bage, 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.
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.
This Furnace Must Be Installed By A Qualified Installer.
GENERAL RULES

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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.
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.
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 connec-
tor 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 #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.
INSTALLATION
INSTALLATION #1 INSTALLATION #2
INSTALLATION #3