Breckwell SF747 Administrator Guide

1
852000
Model: SF747
Wood or Coal Gravity Style (Up-Flow) Supplemental Furnace
United States Stove Company • 227 Industrial Park Road, P.O. Box 151 • South Pittsburg, TN 37380 • www.Breckwell.com
SAFETY NOTICE:
If this furnace is not properly installed, a house re may result! For your safety, follow these installation instructions. Contact
local building or re ocials about restrictions and installation requirements in your area. is furnace must be installed by a
qualied technician. Keep these instructions for future reference.
Installation/Operator’s Manual
Safety Tested to UL 391
Exceptional Heat, Outstanding Value
®
BRECKWELL

2

3
WARRANTY INFORMATION CARD
Name__________________________________________ Telephone #: (_____)_____________
City____________________________________________ State_______ Zip_________________
Email Address __________________________________________________________________
Model # of Unit________________________________ Serial #___________________________
Fuel Type: qWood qCoal qPellet qGas qOther _________________________
Place of Purchase (Retailer)______________________________________________________
City____________________________________________ State_______ Zip_________________
If internet purchase, please list website address___________________________________
Date of Purchase _______________________________________________________________
Reason for Purchase: qAlternative Heat qMain Heat Source
qDecoration qCost qOther _________________________
What was the determining factor for purchasing your new appliance?_____________
I have read the owner’s manual that accompanies this unit and fully understand the:
Installation q Operation q and Maintenance q of my new appliance.
Print Name Signature Date
Please attach a copy of your purchase receipt.
Warranty not valid without a Proof of Purchase.
Warranty information must be received within 30 days of original purchase.
Detach this page from this manual, fold in half with this page to the inside and tape together. Apply a
stamp and mail to the address provided. You may use an envelope if you choose.
You may register online by going to www.usstove.com
All information submitted will be kept strictly condential. Information provided will not be sold for advertising purposes.
Contact information will be used solely for the purpose of product notications.
"CUT HERE "CUT HERE

4
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Fold Here Fold Here
United States Stove Company
P.O. Box 151
South Pittsburg, TN 37380
Fold Here
PLACE
STAMP
HERE
"CUT HERE "CUT HERE

5
INTRODUCTION
ank You for your purchase of a U.S. Stove Wood/Coal Burning
Gravity Style (Up-Flow) Furnace. Your decision to buy our furnace
was undoubtedly reached aer much careful thought and consider-
ation. We are very proud you chose this furnace and trust you will re-
ceive the comfort and economy that others realize when heating with
a U.S. Stove product.
Your dealer is important in your experience with the furnace not only
with the purchase, but for recommendations for professional instal-
lation in your home. e qualied professional installer has been ex-
pertly trained in solid-fuel furnace installation to assure the safety and
comfort for your family while saving you money. Trust your experi-
enced installer. He is a specialist in this eld.
IMPORTANT
Before installing and using your furnace, please read the following
pages thoroughly and carefully. If you follow the instructions, your
furnace will give you safe and more dependable service for years to
come.
• First step: Check your local codes. is installation must comply
with their rulings.
• Do Not install this furnace in a mobile home or trailer
• Always have a smoke or ionization detector and a CO detector
installed in your home.
• To prevent injury or damage, do not allow anyone who is unfa-
miliar with the furnace to operate it.
• is furnace must be installed ONLY in the prescribed manner
shown in illustrations 1, 2, or 3 under the Installation Examples
in this manual. It is NEVER to be installed as a counter-ow or
down-dra furnace, or in any manner wherein the heated air is
directed in a downward ow into the home or toward to an exist-
ing central furnace.
• NEVER INSTALL outside the home.
• Spend adequate time with your furnace to become well acquaint-
ed with the dierent settings and how each will aect its burning
patterns. It is impossible to state just how each setting will aect
your furnace because of the variations in each installation.
DISCLAIMER NOTICE
e BTU ranges and heating capacity specications are provided as a
guide and in no way guarantee the output or capacity of this unit. e
actual BTU output depends on the type of fuel being burned and its
conditions, the thermostat setting, the dra adjustment and the chim-
ney to which the unit is attached. e actual area that this unit will
heat depends on factors such as the conditions of the building, heat
loss, type of construction, amount of insulation, type of air movement,
the location of the unit and more importantly the duct work and re-
turn air facility.
Warning:
Do not alter this appliance in any way other than specied in these
instructions. Doing so may void your warranty.
LOCATING YOUR FURNACE
e furnace is to be installed maintaining the clearances specied in
the following illustrations.
CLEARANCES
REDUCED CLEARANCES
NFPA guidelines and most codes permit reduced clearances to com-
bustible walls and ceilings if adequate protection is added. A common
mistake is to assume that sheet metal, masonry, or millboard placed
directly against a wall protects it. Materials installed in this manner
actually provides very little protection. ese materials are good heat
conductors, so they will be almost as hot on their back side as they are
on the exposed side. erefore, the combustible wall behind is still a
re hazard.
A wall can be kept cool using these items but only if they are mounted
and spaced out from the wall by an inch or two to allow free air cir-
culation behind the protective panel. e protective panel should also
have a gap between the oor and ceiling.
ree rules to follow when constructing wall protectors:
1. Non-combustibility of all materials including mounting and
supporting.
2. A well ventilated air space between protector and wall.
3. Sucient strength and rigidity so that the protector and air
space will be durable.
PROTECTIVE COVERING
AND ALL SUPPORTS MUST
BE NON-COMBUSTIBLE
CONSTRUCTING
NON-COMBUSTIBLE
WALLS
2 in [5cm]
FROM FLOOR
2 in. [5cm]
FROM CEILING
1 in [2.5cm]
AIR SPACE
Do not place the furnace directly on a combustible oor. If you are
placing it on a combustible oor, an approved re retardant material,
equivalent to 3/8” UL Listed millboard, should be placed under the
unit. e material must extend at least 16 inches beyond the front of
the unit and 8 inches on either side of the fuel loading door opening. It
must also extend underneath the chimney connector and to each side
of the connector by at least 2 inches.
22”
12”
20” 15”
COMBUSTIBLE WALL
COMBUSTIBLE WALL
FLUE
(TOP VIEW)
MINIMUM CLEARANCES
TO A COMBUSTIBLE
WALL
CAUTION:
DO NOT store
combustible or
flammable materials or
liquids near the
furnace.

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CHIMNEY REQUIREMENTS
A reclay lined masonry or Class A 103HT All-Fuel Metal Insulated
Chimney must be used in all airtight wood furnace installations. e
minimum recommended ue size for the model AAF747 is 6 inches,
inside diameter. When making new chimney installations, always fol-
low the chimney manufacturer’s instructions.
If at all possible, use the factory built, class A 103HT chimney men-
tioned above. ey are safer and perform better than traditional ma-
sonry chimneys. If a masonry chimney is a must, be certain it has a
re clay liner and that it is intact, clean and recently inspected. And
remember, masonry chimneys are far more prone to the formation of
hazardous creosote.
1. e furnace should be the only heating using the chimney ue
. One furnace per ue outlet.
TOP OF CHIMNEY MUST BE
2 FEET [61cm] ABOVE
HIGHEST POINT OF THE
ROOF WITHIN 10 FEET
[305cm].
2 FT [61cm]
MINIMUM 3 FT [91cm]
MINIMUM
RECOMMENDED
MINIMUM HEIGHT
20 FT [610cm]
MINIMUM 3 FT[91cm] FROM
TOP OF CHIMNEY TO
POINT AT WHICH IT
PASSES THROUGH THE
ROOF.
2. A masonry chimney should have a tile or stainless steel liner.
3. e masonry chimney should not have any missing mortar or
loose bricks.
4. ere should be no mortar or parts of the chimney blocking the
chimney ue.
5. ere should be a two inch clearance between any chimney (ma-
sonry or metal) and combustibles. (such as the house)
6. e chimney should extend at least 2 foot above the highest point
of the house, or 2 foot above the point at which the chimney is 10
foot from the roof.
7. e chimney should be relatively straight and vertical.
8. e portion of an all-fuel metal chimney that extends above the
roof should be well secured.
9. A masonry chimney should be built on footings and not attached
to the house.
10. A rain cap, complete with an animal or bird screen, should be in-
stalled on top of the chimney.
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. e creosote
vapors condense in the relatively cool chimney ue of a slow-burning
re. As a result, creosote residue accumulates on the ue lining. When
ignited, this creosote makes an extremely hot re.
e chimney connector and chimney should be inspected at least twice
monthly during the heating season to determine if a creosote build-up
has occurred. If creosote has accumulated, it should be removed to
reduce the risk of a chimney re.
SMOKE PIPE INSTALLATION
Clearances to combustible materials (i.e. paneling, ceiling tile, sheet rock,
plaster, draperies, casements or wood trim, etc.) will vary with the type
of ue connection used. Be sure to maintain the specied clearances
for your type of installation.
TYPE OF FLUE REQUIRED
CONNECTION CLEARANCE
24 Gauge or Heavier .................................................. 18”
Single Wall Stainless Steel
or Black Pipe
Double Wall, Stainless Steel or .................................. 6”
Double Wall, Black Pipe w/
Stainless Steel Inner wall
Class A 103HT All-Fuel or Equivalent ................... 2”
According to NFPA standards, single wall stove pipes can be within
9” of combustibles provided an approved re retardant material cov-
ered with 28 gauge sheet metal, spaced out 1” on non-combustible
spacers, is utilized. See illustration.
18” [46cm] 18” [46cm]
9” [23cm]
When using a Class A or double wall ue pipe connection, follow the
manufacturer’s instructions.
When constructing a single wall smoke pipe, the following guidelines
must be observed.
1. The connector pipe should be 24 gauge or heavier stainless
steel or black pipe.
2. Secure all joints with three #8 screws.
3. If the connector pipe must pass through a wall, an approved insu-
lated or ventilated thimble, at least three times the diameter of the
smoke pipe must be used. (i.e. a 6” diameter smoke pipe needs an
18” thimble).
4. e connector pipe should never be used as a chimney.

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DAMPERS ON STOVE PIPES
When burning coal, we recommend a Barometric Dra Damper be
installed at a safe convenient place between chimney and your furnace
preferably less than 3’ from the ue collar.
When you have installed the connector pipe between your furnace
and the chimney, tap the pipe hard with your ngernail. Remember
the sound it makes - it will be a “ting” echoing inside the stove pipe. If
later you tap and hear a mued thud, you are building up soot in the
pipe and should clean it. is pipe should be cleaned at least once or
twice during the heating season.
DO NOT CONNECT TWO HEATERS TO THE SAME CHIMNEY
FLUE. e National Fire Prevention Association recommends that wood
burning appliances vent into a separate ue from gas or oil furnaces. If
such an installation is contemplated, rst check with a local building
inspector to nd out if a separate ue for a wood burner is required.
Use of a Barometric Dra Control (when burning wood) is recommended
ONLY in the event your chimney creates excessive dra leading to an
over-ring condition.
HEATED AIR DISCHARGE
e furnace is designed for use as a supplemental heating source. When
used as a supplementary furnace, it is connected in conjunction with an
oil, gas, or electric furnace to the existing duct work which distributes
the heated air into several rooms and/or areas.
ough United States Stove Company expressly Does Not recommend
CONNECTING HOT AIR DUCT
TO FURNACE
when installed with existing oil or gas furnaces.
INSTALLATION EXAMPLES
INSTALLATION #1
With this installation, a back dra 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.
IMPORTANT INFORMATION FOR ALL
CONNECTOR PIPES
e connector pipe must be constructed and installed so that it main-
tains clearances, keeps condensation and creosote within the pipe, and
is capable of withstanding a 2100°F degree chimney re.
1. e connector pipe should slant down toward the furnace a mini-
mum of 1/4” to the foot. At no time should the pipe turn downward
toward the chimney or run horizontal.
2. ere should be no more than two 90 degree elbows.
3. e connector pipe should never be longer than six feet. If it is
absolutely necessary to make a run of more than six feet (not
recommended) use extra support brackets every 3 feet.
4. e connector pipe should never be reduced to a smaller size than
ue opening on the furnace.
5. e connector pipe should not block the ue of the chimney or
extend into it in any way.
6. A good airtight thimble should be used to hold the connector pipe
in the chimney. It should be constructed so the connector pipe can
be removed for cleaning.
7. e connector pipe should not leave the heated portion of the
building to reach the chimney.
8. e connector pipe should not pass from one story to the next
before entering the chimney, nor should it pass through any closed
or enclosed space.
9. e connector pipe and any elbows must be of 24 gauge or greater.
10. e connector pipe should not be located near or in a walk way or
well traveled area.
11. All male ends of connector pipe should run or point towards the
furnace.
12. Install a cast iron adjustable damper in the rst joint of the con-
nector pipe, nearest to the ue collar.
the use of its furnaces to be installed and/or used as a free-standing
heater, it is possible to achieve a reasonably safe and functional instal-
lation IF certain standard procedures are followed. e following are
guidelines only and are intended to enable the furnace user to obtain
reasonable eciency from his furnace, and with due respect to safety
when installing as a “free-standing heater”. If installed correctly, and
in accordance with the instructions found in this manual, your warm
air furnace may be installed as a “space heater” within living quarters,
cabins, garage, or workshop. Please adhere to the following:
1. e use of a cold air return and/or lter box is mandatory. is will
not only increase your blower life and provide ltered air, it will
also help prevent the blower or blowers from “capturing” heated air
exiting from the top of the furnace heat outlets.
2. If installed as purchased , without directing the heat away from the
furnace itself, it will simply sit and cycle, turning the blowers o and
on. e thermostat may not function properly.
3. All larger furnaces (or those with multi-speed blowers) absolutely
require BACK PRESSURE to prevent premature motor winding
failure. If allowed to operate at high RPM (As in “FREE AIR” mode
- no duct work or ow restrictions) the windings overheat, insulation
melts and the motor simply burns up - not covered under warranty.
We strongly recommend that the hot air duct work be installed by a
home heating specialist. If doing the installation yourself, before you
decide which installation will best suit your needs, consult a qualied
heating technician and follow his recommendations as to the safest and
most ecient method of installation.
e following illustrations are the ONLY acceptable congurations

8
INSTALLATION #3
e bae 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 #2
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.
THE PLENUM OPENINGS DIFFER
BETWEEN THE 1602 AND 1802
MODEL 1602 - 13” x 18” Rectangular
MODEL 1802 - 18” x 18” Rectangular
RETURN AIR IS VERY IMPORTANT
When installing your furnace, return air MUST BE incorporated into
the system. Return air can be provided by installing a separate duct
system or by tying into the cold air return of an existing gas or oil
furnace. e cold air return duct can be connected to the furnace with
either a factory manufactured lter box, model UFB908 or an equiva-
lent fabricated from sheet metal.
When installing a cold air return, the minimum size shall be a 16” x
20” or equivalent (320 sq. in.) in order to insure proper furnace per-
formance. Failure to provide return air ducts of the specied size will
void your warranty.
A lter should be installed in the cold air return. Furnace lters should
be checked and cleaned/replaced regularly.
If return air is not provided, the warm air distributed into your home
will be restricted and the eciency of the furnace is decreased. With-
out a return air system, warm air will be drawn into your basement,
unnecessarily heating unused areas of the home. In extreme cases, if
your basement or utility room is fairly airtight, the blowers on the fur-
nace could depressurize the room and pull toxic ue gases from the
furnace, a gas water heater, or gas furnace. e fumes could then be
distributed throughout the house.
COMBUSTION AIR
All res need air (specically oxygen) to burn. Furnaces, replaces,
and wood burning furnaces need enough oxygen for complete com-
bustion of their fuels. e incomplete combustion that takes place
when a furnace is “air starved” causes carbon monoxide (CO) to be
formed in quantities that can be dangerous inside a well sealed house.
Having a source of combustion air from outside the home will prevent
“air starvation” of the furnace. A simple positive air supply can be con-
structed using dryer vent and a modied termination.
NEGATIVE
PRESSURE IN
BASEMENT
PLENUM OPENING
13” x 18” Rectangular

9
FURNACE ASSEMBLY INSTRUCTIONS
Unpack your Furnace and insure that there is no shipping damage. If
damage exists, please contact your dealer immediately.
Your furnace will require some assembly before operation. All needed
hardware and components for the following assemblies are included
within the parts boxes inside the furnace and in the ash pan. Read and
follow these instructions for proper furnace assembly.
DOOR HANDLES
Insert door handle into door. From rear side of door, place a 1/2”
washer over the threaded part of the handle, then attach the lock nut.
Tighten the nut, then back o 1/4 turn to allow free operation of the
handle.
Follow these same directions for the ash door handle assembly.
(2) Door Handle
(2) 1/2” Washer
(2) 1/2” Lock Nut
ASH DOOR SPIN DRAFT
Screw the spin dra onto the 3/8” x 2-1/2” carriage bolt. en screw
the spin dra and bolt into the ash door allowing approximately 1/2”
of the bolt to stick through the back side of the ash door. Secure the
bolt in place with the 3/8”-16 lock nut.
(1) Spin Dra
(1) 3/8-16 Carriage Bolt
(1) 3/8-16 Lock Nut
FUEL & ASH DOOR LATCH
With two 1/4-20 x 3/4 hex bolts each, attach the door latches to the
door latch mounting brackets on the le side of the door frames as il-
lustrated. e slots in the brackets and latches are for door seal adjust-
ment. Make the proper adjustments, then tighten the nuts. e door’s
gasket should be snug against the door frame on the furnace.
Feed Door
Illustration
Ash Door
Illustration
(1) Feed Door Latch
(1) Ash Door Latch
(4) 1/4-20 x 3/4 Hex Bolt
(4) 1/4-20 Kep Nut
SHAKER GRATE HANDLE
BRACKET
Insert the Shaker Rod into the hole on the ash door frame as shown.
en attach the Shaker Bracket to the front of the furnace using two
1/4-20 x 3/4” Hex Bolts and two 1/4-20 Lock Nuts. Next, insert the
shaker Rod into the bracket and attach to the shaker grate bar using
the 1/4-20 x 1” Hex Bolt and a 1/4-20 Lock Nut. e bolt and nut re-
taining the shaker bar and rod should be le loose to allow free move-
ment of the grates.
(1) Shaker Rod
(1) Shaker Bracket
(1) 1/4-20 x 1” Hex Bolt
(2) 1/4-20 x 3/4” Hex Bolt
(3) 1/4-20 Lock Nut
SMOKE CURTAIN
FRONT
SMOKE CURTAIN
SMOKE CURTAIN
CLIP
NUT
BOLT
1/4-20 NUT
SMOKE CURTAIN
CLIP
1/4-20 x 1-1/4
CARRIAGE BOLT
SMOKE CURTAIN
Using two 1/4-20 x 1-1/4” Carriage bolts, the smoke curtain clips and
two nuts, attach the smoke curtain in place above the Fuel Feed Door
as shown below. Aer installation, the smoke curtain should swing
freely back into the furnace.
(1) Smoke Curtain (2) Smoke Curtain Clips
(2) 1/4-20 x 1-1/4 Carriage Bolt (2) 1/4-20 Kep Nut

10
SPRING HANDLES
Attach the four(4) spring handles to the Feed/Ash Doors, Bae Rod,
and Shaker Rod by twisting the springs counter-clockwise while ap-
plying pressure until you have screwed them approximately 3/4”-1”
onto the rods.
(4) Spring Handles
DISTRIBUTION BLOWER & ACC.
(2) 800 CFM Blower
(2) Gasket, Blower
(8) Tinnerman Clip, 1/4-20
(8) 1/4-20 x 3/4 Bolt
(2) Conduit Assembly (5)
(1) Honeywell Limit Control
(1) Conduit Assembly (1)
(1) Junction Box
(1) Insulation (5” x 5”)
(1) Rocker Switch
(1) Romex Cable Clamp
(1) Fan Center Control
(3) 73B Wire Nut
(1) 74B Wire Nut
(1) Female Term. (blue)
(1) Female Term. (red)
(8) #10 x 1/2 Screw
1. Remove all contents and insure that all components are present for as-
sembly. See the part list below
2. Begin by attaching the blowers to the unit. Insert a clip into each mount-
ing hole in the furnace’s cabinet back. Be sure to install the gasket be-
tween the blower and cabinet back. Insert the eight bolts provided and
tighten.
3. Mount the Honeywell limit control to the cabinet back. e conduit as-
sembly should already be attached to the limit control, otherwise, do so
then make the correct wiring connections to the limit control. See wiring
diagram.
4. Next, mount the junction box and insulation using two of the #10 x 1/2
screws provided. Make a small slice in the 5 x 5 insulation to allow the
wires from the dra blower to protrude, then Install it between the cabi-
net back and junction box, with the foil side to the cabinet back. Attach
the conduit assembly from the limit control to the junction box as shown.
5. If not already installed, snap the rocker switch into the top of the junction
box. Provide a 110 volt power supply and connect to the junction box
with the cable clamp to the right side.
6. Attach the two longer conduit assemblies to the junction box and to each
blower.
7. Before mounting the Fan Center, make all the wire connections per the
wiring diagram, then attach the fan center to the junction box.
All electrical connections should be done by a qualied elec-
trician.
NOTE: e extra brown wire on the fan center has no use. It
should be capped o or removed.
e conduit may be cut shorter to provide a cleaner installation.
WIRING DIAGRAM

11
FIREBOX BRICK REPLACEMENT
is furnace comes from the factory with the rebrick installed. How-
ever, if brick replacement is necessary, follow these instructions. Be-
fore furnace operation, remove the brick retaining strip. is piece is
used during shipping to reduce brick damage.
For model AAF747, there are 6 full brick and 1 half brick per side.
Install the half brick rst by putting the bottom of the brick in rst
and let it rest against the rebox side and re grates. en slide it to
the rear. Aer that, install the #2, #3, #4, #5 & #6 brick, sliding the
6th brick forward to allow for the 7th brick. Repeat for opposite side.
NOTE: Prior to operation, be sure to remove the brick retaining
strips.
FORCED DRAFT BLOWER - 69189
Using two 1/4-20 x 1” bolts and nuts, attach the dra blower adapter
to the dra tube on the front of the furnace. en mount and secure
the dra blower to the adapter with the three 10-24 Kep nuts. Plug the
blower into the outlet on the front of the furnace.
(1) Dra Blower
(1) Dra Blower Adapter
(2) 1/4-20 x 1 Hex Bolt
(2) 1/4-20 Lock Nut
(3) 10-24 Kep Nut
FIREBRICK AND BAFFLE REPLACEMENT
BAFFLE/BRICK REPLACEMENT
If bae replacement is necessary, slide the bae out until you can ac-
cess the nuts thru the ue outlet. Once the nuts have been removed,
slide the bae o the rod and thru the opening in the rebrick. You
may have to remove one of the rebrick to make bae removal easier.
For model AAF747, there are 4 full brick and 1 half brick in the top of
the furnace. Install the brick by inserting one end of the brick angled
upward and then allowing the opposite end to rest on the rebox lip.
Lay the brick between the spacer and rebox back. Slide the bae to
the rear and let it rest on that half brick. Aer installing brick #2 in
the front, install #3 and slide it under the bae. Finally install bricks
#4 and #5.

12
Aer installation of the furnace is complete, it is ready for operation.
e Honeywell Limit Control, in conjunction with a wall thermostat,
operates the distribution blowers and the dra blower on the front of
the furnace. e limit control can be adjusted to your desired blower
On/O times. e factory settings are 100/150/200.
e wall thermostat setting operates the ON time of the dra blower.
If the temperature is below the setting on the wall thermostat, the dra
blower will come on. (Recommended setting at 5 to 10 degrees higher
than other heating thermostats.)
e rst two set points on the limit control operates the distribution
blower(s). When the furnace plenum reaches the second set point
on the limit control, the distribution blower(s) will come on. If the
temperature falls to the rst set point, the distribution blower(s) will
shut-o. e rocker switch on the top of the junction box gives you the
option to run one blower or two. If the switch is ON, both blowers will
come on when the plenum reaches the set temperature.
When the furnace reaches the third set point on the limit control, the
dra blower will shut-o. e dra blower will come back on if the
temperature falls below the setting on the wall thermostat.
GENERAL FURNACE OPERATION
TESTING AND OPERATING PROCEDURES
1. Check the dra blower by turning the room thermostat up high
enough so that the dra blower turns on. en lower the thermostat
setting until you hear it shut o.
2. Use a sheet of newspaper to test your dra by placing it inside the
furnace and lighting it.
With completion of the tests above, you are ready to light the furnace.
Follow the operating steps.
TESTING
STARTING A WOOD FIRE
Using Forced Air Draft
STARTING A COAL FIRE
If you burn coal, a forced air draft is required
Shut o FAD when fuel door is open
 Open smoke pipe damper all the way. Open all dra controls on
your AAF747. Pull the slide bae forward.
 Place about 10-15 lb. of coal in on the shaker grates. It should come
up to about half of the rst rebrick level.
 Place crumpled paper over the coal and crisscross a couple handfuls
of dry kindling wood 3/4” in thickness on top of paper.
 Ignite the paper and close loading door. Wait about 30 minutes until
coal re is established before adding more coal. NOTE: NEVER load
coal over the level of rebrick.
 Close by-pass damper and set all dra controls to your own needs.
It may take 3 to 4 coal res to determine how your local coal and
the furnace reacts together. Adjusts dras accordingly.
 Loading with a good bed of coals in the morning - Open by-pass
damper.
1. In normal shaking, only rock the grates a small amount to si
ash through. Do not agitate the re bed too oen. is practice
will waste coal. If glowing coal is visible in the ash pan, you have
shaken too much.
2. Remove all ashes every day from ash pit.
CAUTION: Ashes should be placed in a metal container with a tight
tting lid. e closed container of ashes should be placed on a non-
combustible oor or on the ground well away from all combustible
materials pending nal 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 coals have thoroughly cooled.
3. With your poker, push hot burning embers to the rear of the unit
and add green coal in front. NEVER load over height of rebrick.
is can result in damage to your furnace and home.
4. Close by-pass damper.
 Too much dra air will cause clinkering of coal and will waste heat
up the chimney. Shut dra down to as low a point as you can and
still heat your home.
1. NOTE: Never stand in front of loading door when opening it.
Stand to the side.
2. NEVER completely cover the live re with fresh coal. Always leave
a generous area of glowing coal at the top of the re and at the rear.
3. Always keep the ash pit clean.
 If the re goes out or does not hold overnight, look for:
1. Poor dra.
2. Incorrect damper settings.
CAUTION: Never use gasoline, gasoline-type lantern fuel, kerosene,
charcoal lighter uid, or similar liquids to start or “freshen up” a re
in the furnace. Keep all such liquids well away from the furnace while
it is in use.
1. Open spin dra cap on ash door.
2. Pull the slide bae rod to the front position.
3. Open the fuel load door and light re using kindling and several
sheets of newspaper, then close the furnace door. e furnace door
should remain closed for 5 to 10 minutes in order to establish the
re. If the re has established, you are ready to load the furnace.
CAUTION: To prevent ame and smoke spillage, the slide bae must
be pulled out and the fuel door must be cracked for ten seconds before
being fully opened.
Do not over re your furnace! Aer you have become familiar with its
operating, you should know how much wood to use.
4. Load the furnace, close the load door and push the slide Bae rod
to rear.
5. Close the spin dra cap on ash door, leaving it cracked about the
diameter of a dime.
6. e forced air dra cycles on demand from the wall thermostat.
Setting the thermostat four degrees higher than your existing ther-
mostat is recommended. In operation, the power dra blower will
run until the thermostat temperature setting is reached. e dra
regulator on the forced air dra is preset at the factory and should
require no adjustment.
CAUTION: To avoid excessive temperatures, do not
operate with fuel door or ash pan open.

13
MOVE ASHES FREQUENTLY!
 Be extremely careful when removing furnace ash pan; it can get very
hot.
 With new steel, there is a small amount of oil or dirt on the metal.
You may smell an odor. is is normal during the rst operation.
You may want to assemble the furnace out of doors and build a small
re in it to “burn o” this dirt and oil before installing the unit.
 e furnace is designed to burn air dried wood and coal at a pre-
determined ring rate. Over ring could result in damage to the
heat exchanger and cause dangerous operation. Over ring occurs
when the ash door is le open during operation or a highly volatile
fuel, i.e. large amounts of small kindling, is used. If any portion of
the connector pipe glows orange or red, you are in an over-ring
situation. Close all dampers.
 When tending the rebox always pull the bae slide rod out prior
to opening load door. Open load door slowly to avoid a “ash back”.
Aer closing load door, push the bae slide rod to the rear.
 Equip your home with re extinguishers and smoke detectors ap-
propriately located.
 Inspect air lters regularly. e air lter in the lter box should be
changed at least every 30 days.
 Oil motor on forced air dra every 90 days with a few drops of 30
wt. oil.
 e distribution blower motors may be one of two types. If the motor
has sealed bearings, no oiling is required.
If the motor is equipped with ll holes, the motor should be oiled
every 90 days with several drops of 30 wt. oil.
 Check the t on the load door. It must t tightly. If it does not, check
for deterioration or wear of the ceramic rope seal. Replace defective
seals.
 Inspect and clean your chimney and stove pipe regularly.
 In event of chimney re, shut all dra controls and call your re de-
partment immediately. Alert everyone in the house. If the re is still
burning vigorously, throw baking soda into rebox or discharge a re
extinguisher into the rebox. Aer chimney re is over, completely
inspect system for damage before further use.
 NEVER throw water on the re or at the furnace, as rapidly expand-
ing steam could result in a severe scalding.
 Slow res: It is not recommended burning the furnace any more
than necessary early in the fall and late spring, as you cannot keep
the rebox hot enough (without overheating your home) to burn
gases. Slow res can cause excessive creosote build-up in smoke
pipe, chimney and rebox.
 Wood should be placed directly onto the cast iron shaker grate of the
furnace. Do not use additional grates and/or irons.
 In the event of a power failure, you may operate the AAF747 furnace
provided the following instructions are followed:
1. Any air lter should be removed.
2. Observe the furnace operation closely and oen till power is
restored.
 Do not burn garbage, plastics, gasoline, drain oil or other ammable
liquids. Plastics, when burned, form hydrouoric and hydrochloric
acids which will damage and destroy your furnace pipe and chimney.
e burning of trash or oil can result in an extremely hot re and is
sometimes a cause of chimney res. NEVER BURN GREEN WOOD
OR TIRES.
 Do not store fuel or other combustible material within marked instal-
lation clearances.
NOTE: For further information on using your furnace safely, obtain
a copy of the National Fire Protection Association publication “Using
Coal and Wood Stoves Safely.” NFPA NO. NW-8-1974. e address of
the NFPA is 470 Atlantic Ave., Boston, Massachusetts 02210.
OPERATING NOTES
THIS IS A WOOD AND COAL BURN-
ING FURNACE AND SHOULD NOT BE
ALTERED IN ANY WAY! DOING SO
WILL VOID YOUR WARRANTY!
3. Improper ring methods for coal being used.
4. More combustion air needed.
5. Coal not sized to the furnace. We recommend 1” to 3” diameter
pieces of coal.
6. Ashes, if allowed to accumulate in the ash pit, will not allow the
passage of required air for combustion. Keep ash pit clean.
7. is furnace is not to be used with an automatic stoker unless
so certied.
 ere are ONLY two types of coal allowed for use in this furnace:
Bituminous Coal (so coal) and Anthracite Coal (hard coal). NEVER
USE Cannel (or Channel) coal or Brown (Lignite) Coal.
 See our Bulletin RC454 at the rear of this manual for the best infor-
mation available on burning coal.
 Do not over dra the furnace! It is designed to operate at .06 inches
of water column and must be set with a dra gauge to maintain a
steady dra. (Barometric Damper recommended.)
 Do not allow ashes to build up higher than 2” above grates.
 Never allow the ashes in the ash pan touch the grate section. RE-

14
TROUBLE SHOOTING AND PROBLEM SOLVING
1. Problem:
Smoke pus from furnace
Solution:
A. Check chimney dra. Check for blocked chimney or ue pipe.
Use mirror to check chimney clearance.
B. Check ash pit — if it is too full, empty.
C. Make sure furnace room is not too airtight.
D. Make sure all of chimney mortar connections are airtight.
E. Check ash drawer. Make sure it’s airtight.
F. Check chimney for possible down-dra caused by taller sur-
rounding trees or objects. Correct with proper chimney vent
cap.
G. Check the possibility of a cold chimney forcing cool gases
backward. Remedied by properly insulating chimney with
non-combustible liner — non-combustible insulation.
H. Fuel may be too green.
I. Make sure no other fuel burning devices are connected to the
chimney impairing the dra.
J. Check chimney dra, it should be .06 inches of water column.
is service is provided by a certied chimney sweep.
2. Problem:
Inadequate heat being delivered to your home
Solution:
A. Check home insulation — is it adequate?
B. Check hook-up to furnace — is it installed correctly?
C. Cool air inlet may be inadequate or furnace room too airtight.
D. Your wood fuel may be too low grade. Hardwoods are recom-
mended.
E. Make sure your hot air duct (and other duct work) is airtight.
F. If furnace room is warm but your home isn’t, check back dra
dampers.
G. Is air to the blower available?
3. Problem:
Excess smoke or ames coming out door when refueling
Solution:
A. Wait 15 seconds and open door SLOWLY — then refuel.
B. Check length of ue pipe to chimney. Your unit should be
within six (6) feet of your chimney.
C. Make sure chimney cap is not too close to the top of the chimney.
D. Check chimney dra — make sure chimney ue pipe is clean
and chimney is of adequate height.
E. Make sure you’re not suocating the re with excessive amounts
of unburned wood.
F. Slide bae should be pulled out prior to load door opening.
4. Problem:
Distribution blower vibrating
Solution:
A. Tighten blower wheel to motor sha.
B. Check for bad fan bearings.
5. Problem:
Distribution blower continues to run or will not run
Solution:
A. Check fan limit or heat sensor and cable.
B. Check to see that blower is properly wired.
(See Wiring and Assembly Instructions).
C. Check fuse box or power source.
D. Check power supply.
6. Problem:
Dra blower continues to run or will not run
Solution:
A. Check wiring.
B. Check thermostat or thermostat wire for short.
C. Make sure temperature is calling for heat.
7. Problem:
Odor from rst re
Solution:
A. e odor from new steel should disappear in a few hours.
B. If the odor remains, call you dealer immediately. A bad weld
can cause a fume leak.
8. Problem:
Excessive Creosote
Solution:
A. Check the grade of wood you are burning.
B. Make sure your unit is serviced by its own proper chimney.
C. Check length of ue pipe and its connections.
D. Make sure you are burning the smallest, hottest re to adequately
heat your home.
E. Also see Solutions to Problem one.
9. Problem:
If the re goes out or does not hold over night
Solution:
A. Poor Dra.
B. Incorrect damper settings.
C. Improper ring methods if burning coal.
D. More combustion air needed.
E. Coal not sized to the furnace. We recommend 1” to 3” diameter
pieces of coal.
F. Ashes, if allowed to accumulate in the ash pit, will not allow
passage of the required air for combustion. Keep ash pit clean.
G. is furnace is not to be used with an automatic stoker unless
so certied.

15
PARTS DIAGRAM
11
12
13
16
15
17
14
7
10
5
23
6
32 31
4
3
2
1
37
3
8
9
24
26
25
27
17
16
3 19
18
20
28 29 30
36 21
22
34
34
35
23
33

16
PARTS DIAGRAM AND LIST
Key Description Part # Qty
1Feed Door Assy. (w/Rope Gasket) 69679 1
2 Door Handle 24179 2
N/S Lock Nut, 1/2-13 83444 2
N/S Washer 83835 2
3 Spring Handle 891135 4
4Feed Door Latch 23786 1
5Ash Door Assy. (w/Rope Gasket) 68880 1
6 Dra Cap 23859 1
7 Ash Door Latch 23823 1
N/S Hinge Pin, 5/16” x 1” C21399 4
8Shaker Handle 69005 1
9 Bracket, Shaker Handle 24204 1
10 Ash Pan 68882 1
11 Grate Retainer 40312 2
12 Shaker Bar 891341 1
13 Shaker Grate Section 40314 5
14 Back Liner 40313 1
15 Front Liner 40344 1
16 Full Firebrick (4-1/2 wide x 9 tall x 1-1/4 thick) 89066 16
17 Half Firebrick (2-1/4 wide x 9 tall x 1-1/4 thick) 891414 3
18 Slide Bae 24231 1
19 Bae Rod 86603 1
20 Lock Nut, 1/2-13 83444 2
21 Gasket, Flue Collar 88032 1
22 Flue Collar 40246 1
23 Flue Collar Ring 22761 1
24 Smoke Curtain 23800 1
25 Smoke Door Clip 23787 2
26 Carriage Bolt, 1/4-20 x 1-1/4 Long 83445 2
27 Kep Nut, 1/4-20 83250 2
28 Cabinet Side, Le 69676B 1
29 Insulation, Side C98771 2
30 Insulation Retainer 83884 41
31 Cabinet Side, Right 69675B 1
32 Receptacle, Snap-In 80351 1
33 Cabinet Back 69573B 1
34 Insulation, Panel C98871 2
35 Cabinet Top 69088B 1
36 Front Filler 69674B 1
37 Dra Cover 23818B 1
38 Room Blower - 800 CFM 80530 2
1
43 5
2
Key Description Part # Qty
1Drq Blower Assembly 69190 1
2FAD Bracket 69192 1
3 Bolt, 1/4-20 x 1” 83379 2
4Lock Nut, 1/4-20 83261 2
5Kep Nut, 10-24 83244 3
Key Description Part # Qty
39 Blower Gasket 88127 2
40 Tinnerman Clip, 1/4-20 83340 8
41 Bolt, 1/4-20 x 3/4 83339 8
42 Conduit Assembly (5) 69578 2
43 Honeywell Limit Control 80145 1
44 Conduit Assembly (1) 68859 1
45 Junction Box 25625 1
46 Insulation (5” x 5”) 25626 1
47 Rocker Switch C42373 1
48 Romex Cable Clamp 80362 1
49 Fan Center Control 80130 1
50 Water Coil Access Cover 23819 1

17
DOMESTIC HOT WATER
COIL
REAR WALL OF
FIREBOX
TURN INSIDE NUTS UP
TO END OF THREADS
1. NUT
2. WASHER
3. GASKET
2
3
4
5
6
ACCESS
PANEL
1
is Furnace will accept the installation of a Domestic Hot Water Coil
Kit. e kit is a 1124 Water Coil and it may be purchased from your
local dealer.
1. Remove the access panel on the rear of the furnace enclosure.
2. With a utility knife, cut away a section of the insulation (if
equipped) directly behind the access panel.
3. Remove the cover plate from the rear of the furnace rebox.
4. Place one nut on each end of the water coil and thread each nut up
to the end of the threads on the coil.
5. Insert the coil through the holes from the inside of the rebox.
Install a gasket, washer and nut onto each end of the water coil.
Tighten the nuts down securely to insure an air tight seal.
e installation is now ready to be plumbed to your existing hot water
system. Choose one of the three methods described in the Hot Water
Coil instructions.
6. Remove knockouts from the access panel and re-attach to the fur-
nace enclosure.
Have a qualied plumber connect your domestic hot water pipe to the
coil with the appropriate ttings.
As mentioned earlier in this manual, a cold air return and/or lter box
should be incorporated into your furnace installation. A cold air re-
turn or lter box will increase the life of your blowers and oer ltered
distribution air for your home. e model UFB908 is oered as an
option and can be purchased from your local dealer.
e UFB908 utilizes a standard 16” x 20” lter that can be purchased
from your local dealer or any hardware/duct work supply store. When
installing a UFB908, follow the installation instructions supplied with
the kit.
In the unlikely event that your furnace “overres” (a condition evi-
denced by elbows, stove pipes, and connectors glowing red in ap-
pearance or otherwise discoloring), then your installation is subject
to excessive dra created by either a chimney too tall or too great in
diameter in conjunction with its height, or some other factor of an in-
determinate cause. In this event, you should install a barometric dra
regulator. Such installation will preclude any over-ring and/or any
hazardous consequences of potential overring.
Barometric dra regulators are generally available where you pur-
chased your stove.
UFB908 COLD AIR RETURN / FILTER
BOX - OPTIONAL KIT
DOMESTIC HOT WATER COIL KIT -
OPTIONAL
DR6 - 6” DRAFT REGULATOR KIT -
OPTIONAL KIT

18
BULLETIN RC454
A GUIDE TO BURNING COAL IN YOUR FURNACE
Furnaces that are capable of burning coal usually will burn
both Bituminous and Anthracite coal. Anthracite is perhaps
the best coal fuel because of its long even burn time, high heat
output, and cleanliness which make it a good choice for the
home. However, keep in mind it is a much more dicult fuel to
use, requires more care and patience, is not so widely available,
and is usually much more expensive than Bituminous.
SIZE OF COAL:
Most sizes of Bituminous Coal will work in a coal furnace; for
best results we recommend large “nut” coal to small “egg” coal
(1-3/4” diameter to 4” diameter). When burning Anthracite,
use “egg” or “broken” with sizes between 2-5/16” thru 4-3/8”.
Note that it is important to the long life of your stove to buy
coal which has been sized and cleaned. Cleaning insures re-
moval of rocks and other minerals. Never use coal smaller than
1” or larger than 5” in diameter. Small sized coal will smother
the re. Too large a size of coal will not burn well.
STOVE OPERATION:
All coal res should be started with wood which will allow the
re to get hot enough to ignite the coal. e best ignition res
utilize dry pine or other resinous so woods as kindling, with
hard wood (oak, hickory, ash) added to increase the heat prior
to addition of the coal.
Before starting the re, open the stove pipe damper (if
equipped), turn the thermostat to high, open the ash pit door
and feed door, place newspaper and nely split kindling on the
grate, light the paper, add larger hard wood aer the kindling is
burning brightly. CAUTION: Never use gasoline, lantern fuel,
kerosene, charcoal lighter uid, or other ammable liquids to
start or freshen up a re in any heater. Place the larger pieces of
wood on the re so that they are slightly separated and form a
level for the addition of coal. It will take 10 to 20 minutes before
this wood is thoroughly ignited. Adding coal too soon will cut
the air supply and smother the re.
BURNING BITUMINOUS:
Once your kindling and wood re has produced a bed of well
established coals, start adding coal in layers allowing each to
ignite before adding more. Bituminous has a high volatile con-
tent and, as a result, should be red with the “conical method”
- with the highest portion of your re bed in the center of the
rebox. e rst ames will be long and generally orange or
yellow and produce quite a bit of smoke. As the gases burn
o the ames become shorter, change color and produce less
smoke.
Once the re is WELL ESTABLISHED add coal to the center of
the rebox forming the cone. Burning in this fashion allows heat
to drive o the volatile gases, and turbulence created increases
the burn eciency. ere will have to be some experimenting
with the individual setup as no two chimney’s or installations
are going to be the same. Just remember to allow enough air to
enter the rebox and keep the stove pipe damper open so that
volatiles are properly burned. Before refueling, take the time to
break up the cone a little with a poker, especially if it has caked
over or formed a crust. But, be careful not to mix the coal as
this increases the chances of forming clinkers. When shaking
the grate(s) be gentle. Just a few short movements - a couple of
“cranks” - is better than a lot of agitation. e objective is to
remove a small amount of the ashes without disturbing the re.
Stop when you see a glow in the ashes or the rst red coals fall
into the ash pan. Excessive shaking wastes fuel and can expose
the grate(s) to very high temperatures which can cause warp-
age or burnout.
For overnight operation (long duration burn time) shake the
re and add coal, retaining the center cone. Once the volatiles
are burned o, close the feed door and adjust the stove pipe
damper, if equipped. en adjust the thermostat to the desired
heat level.
More MAINTENANCE will be needed with bituminous coal
than with anthracite coal as more soot will collect on heating
surfaces and in pipes, requiring more frequent cleaning.
ANTHRACITE:
Add a thin layer of coal (preferably smaller chunks) to the
wood re, being careful not to disturb it too much or cut o
the dra. en, add a second heavier layer aer the coal is ig-
nited and burning well. If necessary, add a third layer to bring
the coal up to the top of the front liner (not above!). Be sure to
close the ash door.
Before adding further fuel, be sure to leave a red spot of glow-
ing coals in the center of the rebox to insure that the re has
not been smothered and to help ignite the gases given o by
the new charge. A deep charge will give a more even heat and
a longer re, but it may take one to two hours before the whole
bed is fully ignited.
When the re is well established and the room is becoming
warm, partially close the dampers. Some experimenting will
have to take place with each particular setting of all dampers
and controls as the chimney provides the dra necessary to
not only exhaust the smoke, but to pull combustion air into the
heater as well - and no two chimney’s perform the same. Under
ideal dra conditions, one should be able to turn the secondary
air supply below the feed door (some models) to a near closed
position - but leave the ash pit damper at least partially open to
prevent the re from going out. Adjust the stove pipe damper
to reduce the dra on the re. With anthracite there will be
short blue ames above the coal, except when the re is started
or a new charge is added. If, however, there is no ame then the
re needs more air from the bottom (unless it is near the end of
its burn cycle and needs to be recharged).

19
Only when the coal is burned down to half its original depth it
is time to add fresh coal. When doing so, open the stove pipe
damper and turn the thermostat damper to high, which will
allow the re to burn o any accumulated gases. Open the
feed door, and with a small rake, hoe, or hooked poker pull
the glowing coals to the front of the rebox. Try not to disturb
the re too much. Next, add a fresh charge to the back being
careful not to seal o the top. Close the feed door, but leave the
spin damper (or thermostat) open for a few minutes until the
volatile gases have burned o. It is not necessary to shake down
the ashes each time you refuel the furnace. Experience will be
your best teacher.
BANKING THE FIRE:
For extended operation, such as overnight, the re will need to
be banked. To do so heap coal up along the sides and back of
the rebox so that the re gradually burns it over a longer pe-
riod of time. e intensity of the re will also be reduced with-
out letting it go out. Follow the same procedure as for refueling.
If possible, avoid shaking, as a heavier layer of ash will help
reduce the intensity of the re during this time. Aer loading,
let the re establish itself for about 30 minutes. en close your
damper and automatic control to the point where the house
does not become too cold. It is important that you begin bank-
ing early enough before retiring or leaving that you can make
necessary adjustments aer the re is well established.
To revive a coal re that is almost out, (1) open the ash door
and stove pipe damper and close the spin damper under the
door to get a good dra through the grate. (2) place a thin layer
of dry coal over the entire top of the re. DO NOT POKE OR
SHAKE THE FIRE AT THIS TIME! (3) aer the fresh coal has
become well ignited shake the grate (just a little), refuel.
BULLETIN RC454
A GUIDE TO BURNING COAL IN YOUR FURNACE
DO NOT burn coke, charcoal, high volatile bituminous coal,
sub bituminous, lignite or cannel coal (sometimes called chan-
nel coal or candle coal).
NEVER burn wax or chemically impregnated sawdust logs -
their intended use is for replaces only.
NEVER ll the stove or furnace above the rebrick or cast iron
liner.

20
HOW TO ORDER REPAIR PARTS
is manual will help you obtain ecient, dependable service from the furnace, and enable
you to order repair parts correctly.
Keep this manual in a safe place for future reference.
When placing an order or for warranty claims, please provide the following information
found on the Certication Plate located below the ash door.
PART NUMBER
PART DESCRIPTION
MODEL NUMBER - SF747
SERIAL NUMBER______________
United States Stove Company
227 Industrial Park Road
P.O. Box 151
South Pittsburg, TN 37380
[phone]
Customer Service: (800)-750-2723 • Repair Parts: [phone]