Country Hearth 24A User manual
USSC Page1851731A
227 Industrial Park Road
P.O. Box 151
South Pittsburg, TN 37380
Models: 24A, 30A
TESTED TO UL 391
Report #: 215-S-17-4
LISTED BY PORTLAND,
OREGON, USA
Page2 USSC
Your new furnace must be installed into a
This type of chimney consists of a ue lined brick chimney, or an
approved “Class A” all fuel factory built (prefabricated) type. Any
other installation guarantees an immediate re hazard.
Do not install the furnace into the same chimney serving other
appliances.
When using 8” ue pipe, the chimney should have an 8” to 10”
round ue 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 ue pipe into chimney.
Install your furnace as close to the chimney as possible with a
minimum of elbows, no more than two and a ue pipe run of no
more than 6 feet horizontally. Also, the ue pipe should contain
a 1/2” rise per foot and NEVER be installed closer than 18” from
combustibles.
WOOD BURNING: Install a manual ue 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 red appliances so all clearances are mandatory.
AIR DUCT INSTALLATION: This furnace provides a 12” round (113
sq. in.) opening, because of efciency 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.
U.S. Stove provides easy step by step pictures, therefore, the fur-
nace assembly procedure should be understandable.
Start on a conservative basis. Your new furnace, when properly
red 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 red hot constantly with full ames and only pro-
vides a 3 hour burn cycle, the furnace is being overred. 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 red continually at extremely high temperatures
and this procedure will void your warranty.
This generally occurs when the following procedures are not
followed, ash door is open (even partially open), the feed door
pressure relief ap 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 specic purpose. Also, an overlled ash
drawer can cause grate warpage, keep ash drawer clean. Don’t
use furnace if distribution fan isn’t functioning properly, and keep
air lter clean. Draft fan opening should be set at 1/2” open as
a point of start, depending on condition of fuel.
•Your furnace will hold logs approximately 2” shorter than the
length of the rebox. 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 ue pipe stack temperature between 300 and 400 de-
grees. 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 re and
when chimney draft is marginal.
•Always place logs so air can ow 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 pro-
vide 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 oxy-
gen 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 ue pipe clean, check monthly.
•Smoke detectors and re extinguishers should always be a part
of your equipment.
•Never use chemicals or uids such as gasoline, charcoal lighter,
drain oil or kerosene to light a re.
•Oil the air fan motors yearly. They do not contain bearings,
sleeves with felt. Therefore keeping fan air clean is more impor-
tant 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.
•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 rebox and bricks.
•Treat your furnace with the proper respect and it will reward
you with much comfort, and a lifetime of central heat.
USSC Page3
...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 instal-
lation and operating instructions. We have prepared them for your benet 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
benet 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 specications without notice.
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
welcome
table of contents
Page4 USSC
Check local codes, the installation must comply with
strict conformance in regard to clearances.
The Furnace must be installed on a noncombustible
oor.
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 ue collar to the chimney
opening.
Do not over draft the furnace! It is designed to oper-
ate at .04 to .06 inches of water column and must be
set with a draft gauge to maintain a steady draft.
Do not use ammable liquids for starting a re.
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 dam-
age.
Store all ashes in a metal container with a tight seal-
ing lid and allow ashes to cool before disposing of
them, possibly a week.
Familiarize yourself with the furnace’s solid fuel burn-
ing 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 ef-
ciency.
CAUTION -
The furnace has hot surfaces. Keep Children Away.
Do not touch during operation.
The furnace is designed to burn air dried wood and
coal at a predetermined ring rate. Over ring could
result in damage to the heat exchanger and cause
dangerous operation. Over ring 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 efcient and safe
operation.
Do not leave the ash door open when the re 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 rst operation. You should assemble the
furnace out of doors and build a small re in it to
“burn off” this dirt and oil before installing the unit.
remove the lter 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.
In the event of a chimney re call the re depart-
ment, then be sure the furnace doors are closed
tightly and the power to the unit is turned off.
general rules
USSC Page5
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 burn-
ing rate common to other units on the market. The
re, 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 heat-
ing is inefcient 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 re in it. The re
intensity is regulated by the room thermostat, high
or low, the re 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.
Note: Improper ring. Wood or coal over ring
occurs when the ash door is left open dur-
ing operation or a highly volatile fuel is used.
Coal that exceeds the re brick line will cause
overring...this type of operation will immedi-
ately void any warranty.
how...
Page6 USSC
It is very important you check with your dealer, local
re department, or building inspector. They will be
able to inform you of any state or local codes pertain-
ing 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 distri-
bution 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.
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.
.
After installation, be sure the measured external
static pressure of the central and Furnace is not
greater than those marked on the nameplates.
The bafe on this system should be made the full
width of the furnace plenum in order to properly
direct the air into the distribution ducts.
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.
Extending the hot air duct from the furnace into
the existing plenum will help direct the ow of air
from the furnace as well as the ow in the existing
furnace. Ducting entering the existing plenum at
an angle (approximately 45 degrees) will facilitate
air ow from the furnace while diverting air from the
existing furnace.
installation
USSC Page7
installation
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.
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.
Furnace to back wall 30”
Furnace to side wall 12”
Pipe to back wall 18”
Pipe to side wall 18”
Furnace to ceiling 30”
Ductwork to ceiling 18-6-1”
Page8 USSC
WHAT SIZE CHIMNEY SHOULD BE
USED?
TheChimneysizetouseiseithersix(6)
or(8)inchroundoran8x8”square.If
youusearectangularchimney,themini-
mumareaitmaybeis39squareinches.
“ClassA”chimneysarethosemadefrom
tile-linedmasonry(brickorblock)oran
independentlaboratoryapprovedall-fuel
factory-builtchimney.
CAUTION!
Onlya“ClassA”,all-fuelchimneyintend-
edforusewithsolidfuelshouldbeused.
flue recommendations
USSC Page9
If your home has an existing metal chimney, the same
rules apply as with masonry chimneys. One thing to be
especially aware of is that “Class B” chimneys are for gas
appliances only, not solid fuel burners. If purchasing a
new package, consult with the dealer. He will provide
the necessary parts and instructions for installation.
When installing a new chimney, whether it be masonry
or metal, if possible, it is recommended that it is placed
within the house structure. These chimneys remain
warmer and, in turn, radiate this warmth into the house.
A chimney located outside the house is exposed to cold
temperatures which encourages creosote build-up and
poor chimney draft.
When using a metal chimney, part of the installation
package should include a stove pipe connector. Follow
the instructions provided with the chimney and its parts.
These devices are used to help maintain adequate
chimney draft automatically. They should be installed
according to their instructions and set at .04 to .06 inches
of water column.
These are used to control chimney draft manually and
should be installed in a convenient place between
furnace and chimney. In the event of a chimney re, it
should be closed reducing air to the chimney re.
A combination of both barometric damper and manual
damper may be used. If this is the case, install the
manual damper between the barometric damper and
the chimney.
There are many appliances which require “make up” air
to operate. However, with a combustion air draft fan,
“make-up” air is not usually necessary with your wood
furnace.
If your home is sealed exceptionally well, use a 3” or 4”
diameter duct vented to the outside and terminating
in the vicinity of the combustion air draft fan. Also, it is
possible for your fans to draw in furnace smoke if there is
only dead air in the area. Note: It’s highly recommended
that a cold air return system be utilized. Simply attach a
14” round to a lter box adapter and attach to cold air
return. Also, a cold air return increases motor life.
With the chimney being the most important part to
your installation, great care should be given to its
design.
If your intention is to use an existing masonry chimney,
check rst with your local building ofcial to see if this
is acceptable.
The ue pipe you should use is 6” or 8” 24 gauge or
heavier steel pipe.
When installing the ue pipe, make sure all joints are
secured with at least three (3) sheet metal screws.
This includes the connection to the ue collar of the
furnace. For added protection, use some high tem-
perature furnace cement to seal each joint.
The stove pipe should slope upward to the chimney
at a rate of 1/2 inch per foot. Any horizontal runs
of stove pipe should not exceed six (6) feet and it
should be supported every four (4) feet. Note: Flue
pipe should be attached inside the ue pipe collar
to prevent creosote from running down onto electri-
cal motors.
When connecting ue pipe to a masonry chimney,
there are two ways to go:
The ue pipe itself can be cemented into the
chimney or;
A thimble can be used which is cemented into
the chimney, and the ue pipe ts into the thimble.
In each case, care must be taken. The outer masonry
(brick or block) must be chipped away, and the in-
ner liner must be pierced. The ue pipe or thimble is
then inserted ush to the inside face of the tile liner.
NOT ANY FURTHER!
Use furnace cement or mortar to seal this connec-
tion. When connecting the ue pipe, make sure the
attachment is secure enough so down draft or “puffs”
do not dislodge it.
flue recommendations
Page10 USSC
Prior to assembling, place the unit in the general vicinity of the installation. This should help minimize han-
dling damage to the unit after assembly.
1. Unit side shrouds can be assemble by slipping
the side shrouds into place from the top down.
If they don’t slide easily, open up the lip of the
sides with a large screw driver then add a little oil.
Sometimes a slight tapping with a block of wood
and hammer may be required, but do not force.
When properly installed, the electrical knock-outs
will be at the top left side. NOTE: Should you wish
to install a domestic hot water coil, it should be
secured to the right side prior to assembly. Also,
the rear cast iron bafe must be fastened prior to
shroud installation.
The furnace is partially prewired all that is
required is the wiring of the distribution fan (see
wiring diagram, page 18) and the wiring to wall
the thermostat.
4. After mounting the three (3) fans proceed to the
fan control center.
NOTE: The best maintenance for fan motors is to
keep them clean (exceptionally clean). Oiling
with 20W N. detergent once a season will also
help, but cleanliness is what prolongs motors life.
The distribution motors have sealed ball bearing
motors and should not need oiling. However, if
an oil tube is present, you should oil the motors
once a season as mentioned.
Attaching the distribution fans. Using four(4) of the
supplied 1/4-20 self-tapping bolts, rst install the
blower motor on the right looking at the rear of the
furnace. Then proceed to mount the left blower.
Be sure to place the supplied gaskets between the
motors and rebox back as shown.
Attach the draft fan to the back of the weld on
the throat (2” throat hole with 3 mounting holes).
It’s best to use the self tapping screws without the
draft fan to establish threads then mount blower.
The electrical box on the blower should be facing
downward. Draft fan air intake cover should be
set at a 20% opening, about 1/2” opening.
3.
assembly illustrations
2.
USSC Page11
6. Attach low voltage thermostat No. 18 up to 30
ft. run No. 16 to 15ft. Run (purchase locally) to
terminal plate, screws identied with letters G
& R. (Generally top row center, bottom row
right). Snake wire through holes in top of box.
Replace outer covers & control knob. Under
no circumstances should you attempt to plug
in main power cord until all wiring and covers
are in place. NOTE: A ground power cord plug
is provided; however, local codes may require
fuse box mounting.
8. Install top shroud (if removed) by simply placing
shroud on to the top of unit, push down, check
each corner for snug t.
Attaching furnace control center box. To sepa-
rate outer cover, remove two (2) side screws
and pull off black rheostat knob. Attach box
to left side (facing feed door) with four (4) self-
threading screws. One screw in each corner.
(NOTE: Furnace control center is designed for left
side attachment. Should space prohibit such,
reversing shrouds for right side installation is pos-
sible, however, control wires from box will have
to be extended.)
Next, attach the 4x4 junction box below the
control center box, using (2) self-threading screws
provided in the parts bag. (Two starter holes are
provided.)
5a.
5b.
Wall thermostat should be mounted on an up-
stairs inside wall (no outside facing wall) prefer-
ably near your existing thermostat. For more
specic information, read the Honeywell instruc-
tion sheet provided with thermostat. Caution:
disconnect the power supply before installing.
NOTE: Your wall thermostat and transfer relay
are mated Honeywell products for trouble free
installation.
7.
assembly illustrations
Page12 USSC
10. Lay
the rst grate frame on the side supports and slide
to the back of the unit. Then install the second
grate frame to the front as shown in the picture
above. The smooth ends of the frames should
be together in the middle.
12. Place 5 bricks on each side
(10 brick total). The bricks tuck under rebox
seem.
For the 30A model, use six(6) full brick and 1 half
brick per side. (12 full and 2 half brick total)
9. To install hot air attach-
ing collar, simply bend all tabs right angle under
shroud. This may be possible with thumbs, if not,
remove top and use small hammer.
CAUTION: Any hot air plenum connection to a fur-
nace must be constructed of metal.
Install grates together, slip
shaker lug into hole and place grates into frame.
Grate arch faces upward. Check out grate rota-
tion by placing shaker handle on grate lug (3/4”).
Grates should rotate freely.
NOTE: Grates are designed to withstand high
temperatures, however, should you overre the
furnace you may fuse or melt grates. This hap-
pens if furnace receives too much air caused
by leaving the ash and feed doors open, draft
fan cover wide open, and hot coals or ashes are
excessive in ash pan.
11.
assembly illustrations
Other manuals for 24A
2
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1
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