Models 1357M & 1557M
OWNER'S MANUAL
SOLID FUEL
WARM AIR FURNACE
FOR PARALLEL INSTALLATION WITH EXISTING FORCED AIR-GAS OR OIL
FIRED FURNACE (U.S. ONLY)
FOR INSTALLATION AS A CENTRAL FURNACE
ALL MODELS CERTIFIED UNDER UL 391
IMPROPER INSTALLATION MAY
VOID YOUR WARRANTY
CAUTION:
READALLINSTRUCTIONSCARE-
FULLY BEFORE STARTING THE
INSTALLATIONOROPERATING
THE FURNACE
DO NOT USE THIS FURNACE
IN A MOBILE HOME OR TRAILER
UNITED STATES STOVE COMPANY
227 Industrial Park Road
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P.O.Box 151
South Pittsburg, TN 37380
(423) 837-2100
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Caution Labels
Your Furnace has the following labels. Read and Obey all labels.
DANGER: RISK OF FIRE OR EXPLOSION.
DO NOT burn garbage, gasoline, drain oil, or other flammable liquids.
WARNING: FIRE HAZARD.
DO NOT operate with fire draft exceeding .06 inches w.c.
DO NOT operate with fuel loading or ash removal doors open.
DO NOT store fuels, paints, thinners, flammable liquids, or other highly volatile sub-
stances in the furnace room.
CAUTION:
HOT SURFACES! Keep children away. Do not touch during operation.
CAUTION!
INSPECT FLUE PIPES, FLUE PIPE JOINTS AND FLUE PIPE SEALS
REGULARLYTO ENSURE THAT SMOKEAND FLUE GASESARE NOT
DRAWNINTO,ANDCIRCULATEDBY,THEAIRCIRCULATIONSYSTEM.
CAUTION!
CLEANOUT OF THE HEAT EXCHANGER, FLUE PIPE, CHIMNEY,AND
DRAFTINDUCER(IFUSED),ISESPECIALLYIMPORTANTATTHEEND
OF THE HEATING SEASON TO MINIMIZE CORROSION DURING THE
SUMMER MONTHS, CAUSED BY ACCUMULATED ASH.
SAFETY NOTICE:
If this heater is not properly installed, a house fire may result. For your
safety, follow the installation directions. Contact local building or fire of-
ficials about restrictions and installation inspection requirements in your
area. If not already installed, we recommend that smoke detectors be
installed.
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Rules for safe installation and operation
Read these rules and the instructions carefully. Failure to follow them will cause a
hazard that could result in death, serious bodily injury, and/or property damage.
1. Checkyourlocalcodes. Theinstallationmustcomply 13. CAUTION- The special paints used on your furnace
with their rulings.
maygiveoffsome smokewhiletheyarecuringduring
first few fires., Build small fires at first. The metal
usedinconstructionofthefurnaceandductworkhas
a light coating of oil. This could give off smoke and/
or odor from registers when furnace is used for the
first time. This should disappear after a short period
of time. Once this burn-off has occurred, it should
not reoccur.
2. Do not install this furnace in a mobile home or trailer.
3. Always connect this furnace to a chimney and vent
to the outside. Never vent to another room or inside
a building.
4. Do not connect this furnace to an aluminum Type
B gas vent. This is not safe and is prohibited by
the National Fire Protection Association Code. This
furnace requires a masonry or Listed Factory Built
Chimney for residential type or Building Heating
Appliance Chimney. Use a 6" diameter chimney or
larger, that is high enough to give a good draft.
14. CARING FOR PAINTED PARTS- This furnace has
a painted outside jacket, which is durable, but it will
not stand rough handling or abuse. When installing
your furnace, use care in handling. Clean with soap
and warm water when furnace in not hot. DO NOT
use any acids or scouring soap, as these wear and
dull the finish. DISCOLORATION WILL OCCUR
IF THE FURNACE IS OVERHEATED. FOLLOW
OPERATING INSTRUCTIONS CAREFULLY.
5. Be sure that if a masonry chimney is used, it is safely
constructed and in good repair. Have the chimney
inspected by the Fire Department or an inspector.
6. Inspect chimney connector and chimney before and
frequently during the heating season for any deposit
of creosote or soot which must be removed.
15. Keep the feed and ash doors closed at all times
except while tending the furnace.
7. Provide air for combustion into the room where the
furnace is located. If the intake is not in the same
room, air must have free access to the room.
CAUTION
GASES THAT ARE DRIVEN FROM FRESH COAL
MUST BE BURNED OR THEY WILLACCUMULATE
AND EXPLODE. NEVER SMOTHER A FIRE WHEN
ADDING FRESH COAL.
8. CAST IRON PARTS MUST BE "SEASONED" TO
AVOID CRACKING, BUILD ONLY SMALL FIRES
ON FIRST USE.
9. To prevent injury, do not allow anyone to use this
furnace who is unfamiliar with the correct operation
of the furnace.
CAUTION
DO NOT OPERATE WITH THE FEED AND/OR ASH
DOOR OPEN. THIS FURNACE IS DESIGNED FOR
THERMOSTATIC OPERATION. OPERATION WITH
ANY OF THESE DOORS OPEN WILL OVERHEAT
AND DAMAGE THE FURNACE.
10. For further information on using your furnace safely,
obtain a copy of the National Fire Protection Asso-
ciation (NFPA) publication "Chimney's, Fireplaces
and Solid Fuel Burning Appliances" NFPA 211. The
address of the NFPA is Batterymarch Park, Quincy,
MA 02269.
CAUTION
11. Keep the ashpit section free of excess ashes. Do
not allow ashes to stack higher than the sides of the
ash pan.
NEVER USE GASOLINE, GASOLINE-TYPE LAN-
TERN FUEL, KEROSENE, CHARCOAL LIGHTER
FLUID, OR FLAMMABLE LIQUIDS TO START OR
"FRESHEN UP" A FIRE IN THE FURNACE.
12. DISPOSAL OF ASHES- Place ashes in a metal
container with a tight fitting lid. Keep the closed
containeronanoncombustiblefloororontheground,
well away from all combustible materials. Keep the
ashes in the closed container until all cinders have
thoroughly cooled. The ashes may be buried in the
ground or picked up by a refuse collector.
WARNING
NEVERSTOREFLAMMABLELIQUIDS,ESPECIALLY
GASOLINE, IN THE VICINITY OF THE FURNACE.
Your Furnace is designed to be installed in a parallel air flow arrangement with a gas or oil-
fired forced air upflow-type central furnace, or it may be installed as a central furnace.
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HOW THE FURNACE FUNCTIONS
Your HOTBLAST Furnace is designed to be a
supplemental or central heating source for your
home. This Solid Fuel Furnace may be installed
in conjunction with a properly operating central
furnace that is listed or certified in accordance
with nationally recognized safety standards and
equipped with the required controls and other
safety features and which has been installed in
accordance with appropriate standards of the
National Fire ProtectionAssociation with installa-
tionclearancesspecifiedinthefurnacenameplate
marking. The installation must be accomplished
by a qualified agency (one who is engaged in,
and is responsible for, or is thoroughly familiar
with the installation and operation of the gas, oil,
and solid fuel burning heating appliances, who
is experienced in such work, familiar with all the
requirements of the authority having jurisdiction.)
The installation shall be in strict accordance with
the manufacturer's installation instructions fur-
nished with the solid fuel furnace.
PARALLEL INSTALLATION: (U.S. ONLY)
The design is such that when the blower comes
on, the blower on the central system also comes
on. The blower will only come on when the tem-
perature in the plenum has reached the setting
on the blower control. This is to insure that there
is sufficient warm air in the system to make it ef-
ficient for the unit to operate. When the central
systemthermostatcallsforheat,thecentralsystem
will operate by the burner igniting and the blower
coming on. It is possible that both systems will
operate simultaneously. It is recommended that
for the most efficient use of your HOTBLAST Fur-
nace, that it be fired as much as possible in order
to reduce the demand on your existing central
heating system. This unit has an optional forced
draft kit that operates from a wall thermostat.
When the temperature falls below the setting on
the wall thermostat, the forced draft will come on
(U.S. Stove Option 11/DIKL)
The warm air supply outlet of the HOTBLAST
Furnace shall not be connected to the cold air
return of the central furnace, because the possi-
bility exists of components of the central furnace
overheating and causing the central furnace to
operate other than is intended.
The chimney connector of the furnace is to be
installed to provide clearances to combustible
material not less than specified in the individual
classifications and marked on the furnace. The
chimney connector must be connected to a chim-
neysuitableforusewithresidentialtypeorbuilding
heating appliances which burn solid fuel.
SERIES INSTALLATION:
This type of installation uses only the blowers of
the existing central furnace. The solid fuel fan/
limit control must also control the functions of the
existing furnace. All electrical power must come
from a single branch circuit.
TheFurnaceisdesignedtooperateineitherparal-
lel or series air flow arrangement with the central
furnace or as a central furnace.
CENTRAL FURNACE INSTALLATION:
As a central furnace, the unit functions indepen-
dently of any other system. The blower will come
on when the plenum temperature reaches the
setting on the blower control.
5
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DIMENSIONS OF FURNACE
Figure 1
Model 1357M
Figure 2
Model 1557M
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Locating the Furnace
18"
1. The furnace should be located in the same
room as the central system and as close as
possible, but not closer than 9". There should
be no wall between the furnace and the warm
air outlet duct that is connected directly to the
warm air outlet plenum of the central furnace.
(See Fig. 4)
6" CHIMNEY
21"
CENTRAL
FURNACE
12"
9"
2. Place the furnace on a noncombustible floor.
3. Check figures 3 through 5. Be sure you have
the clearances shown below from the furnace
and the connector pipe to combustible sur-
faces. If you have a solid brick or stone wall
behindyourfurnace,youcanplacethefurnace
as close as you wish to the wall. If the wall
is only faced with brick or stone, treat it as a
combustible wall.
48"
Figure 4
1357M
12"
1557M
12"
18"
Unit to Sidewall
Unit to Backwall
(305mm) (305mm)
30" 30"
(760mm) (760mm)
48" 48"
(1.22m) (1.22m)
18" 21"
(460mm) (530mm)
18" 18"
(460mm) (460mm)
6" 6"
6" SOLID DAMPER
Front of Unit to
Combustible
6" BAROMETRIC
DRAFT REGULATOR
Chimney Pipe
to Sidewall
18"
Chimney Pipe
to Backwall
Plenum to
Combustibles (150mm) (150mm)
PLENUM
TO
6" MIN.
CEILING
2" MIN. AIR SPACE
REQUIRED BY CODE
NON-COMBUSTIBLE FLOOR
Figure 5
CENTRAL
FURNACE
Figure 3
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Chimney Connection
MASONRY CHIMNEY
Beforeusinganexistingmasonrychimney,clean
the chimney and inspect the flue liner to be sure
it is safe to use. Make repairs before attaching
the furnace. The connector pipe and fittings
you will need to connect directly to a masonry
chimney are shown.
THIMBLE
6" ELBOW
6" SOLID DAMPER
6" BAROMETRIC
DRAFT REGULATOR
The chimney connection should be as short as
possible.
6" CHIMNEY
CONNECTOR
Iftheconnectorpipemustgothroughacombus-
tible wall before entering the masonry chimney,
consult a qualified mason or chimney dealer.
Theinstallationmustconformtolocalfirecodes,
and N.F.P.A. 211.
6" ELBOW
DO NOT CONNECT THIS FURNACE TO
A CHIMNEY FLUE SERVING ANOTHER
APPLIANCE.
Thechimneyusedforafurnacemustnotbeused
to ventilate the cellar or basement. If there is
a cleanout opening at the base of the chimney,
close it tightly.
Figure 6
LISTED FACTORY BUILT CHIMNEY
2' MIN.
Carefullyfollowchimneymanufacturer'sinstruc-
tions. Use only a Listed Residential Type or
Building Heating Appliance Chimney. If your
chimney starts at the ceiling (Fig. 7), you will
need enough 6" pipe to reach the ceiling.
REFER TO CHIMNEY
MANUFACTURER'S
INSTRUCTIONS AND
PARTS.
10'
3' MIN.
The top of the chimney must be at least 3 feet
above the roof and be at least 2 feet higher than
any point of the roof within 10 feet (Fig. 7).
6" SOLID DAMPER
6" BAROMETRIC
DRAFT REGULATOR
6" CHIMNEY CONNECTOR
6" ELBOW
Figure 7
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Rules for Connector Pipe Installation
1. Thecrimpedendofthechimneyconnectorfitsinside
thefurnacefluecollar. Installadditionalchimneycon-
NOTE:
A flue pipe shall not pass through an attic, roof
space,closetorsimilarconcealedspace,afloor
or ceiling of combustible construction. Where
passage through a wall or partition is desired,
installation must conform with UL standards.
nectorsandelbowwiththeCRIMPEDENDTOWARD
THE FURNACE. This will allow any condensation
in the flue to run back into the furnace. Use 6" dia.
steel pipe and elbows for connection to chimney.
Never use less than 24 gauge and although blued
steel is satisfactory, high temp painted black is much
more desirable. (See Figure 8)
2. Slopeanyhorizontalpipeupwardtowardthechimney
at least 1/4 inch for each foot of horizontal run.
3. You must have at least 18 inches of clearance be-
tween any horizontal piping and the ceiling.(See Fig.
5)
4. The chimney connector must not extend into the
chimney flue. (See Fig. 9)
5. Seal each chimney connector pipe joint with furnace
cement. Also seal the pipe at the chimney.
6. Use 3 sheet metal screws at each chimney pipe joint
to make the piping rigid.
Figure 8
7. The chimney connector may include a section for a
barometric draft regulator between the furnace and
the chimney (Fig. 6, 7, & 10). The barometric draft
regulator must be installed in the same room (same
pressure zone) as the furnace.
8. Install the barometric draft regulator strictly in ac-
cordance with the instructions that are provided with
the barometric draft regulator.
RIGHT
WRONG
WRONG
9. Asoliddampermustbeusedinthechimneyconnect-
ing pipes between the flue collar and the chimney.
When used in conjunction with a barometric draft
regulator, the solid damper must be placed between
the barometric and the chimney. (See Fig. 6, 7, & 10)
Figure 9
NON COMBUSTIBLE
INSTALLATION PER
NFPA 211
AdjustingtheBarometricDraftRegulator
6" SOLID DAMPER
6" BAROMETRIC
1. Drill a hole in the chimney connector within 18" of
the flue collar below the barometric draft regulator
just large enough for the tube of the manometer.
DRAFT REGULATOR
MEASURE FLUE DRAFT HERE
2. Build a fire after all chimney connections have been
made.
3. Use a manometer to measure the draft in the flue.
4. Adjust the Barometric Draft Regulator to obtain a
draftof0.05-0.06"W.C. understablefireconditions.
Figure 10
9
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CONNECTION OF CHIMNEY CONNECTOR TO A MASONRY CHIMNEY THROUGH A COMBUSTIBLE WALL
Figure 8 shows how to connect the chimney connector of a heater to a masonry chimney through a combustible wall.
There are five allowable ways that a chimney connector can be connected to a masonry chimney by passing through a
combustible wall. NFPA Standard 211 allows the following wall pass-through systems.
Figure 11
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FIGURE 12, PART A
MINIMUM CHIMNEY CLEARANCE TO
BRICK AND COMBUSTIBLES IS 2 IN.
MINIMUM CLEARANCES 12 IN.
OF BRICK ALL AROUND
CHIMNEY CONNECTOR
TO HEATER
FIRE CLAY LINER
MINIMUM 12 IN.
(5/8" MIN. WALL THICKNESS)
TO COMBUSTIBLES
MASONRY CHIMNEY
CONSTRUCTED TO
NFPA211
MIN. 3-1/2" THICK BRICK
MASONRY WALL
1. Use a minimum 3-1/2" thick brick masonry wall framed into the combustible wall. A fireclay liner (ASTM C315 or equivalent) having
a 5/8" minimum wall thickness must be used and it must be at least 12" away from any material that could catch fire. The inside
diameter of the fireclay liner shall be sized for the proper snug fit of a 6" diameter chimney connector pipe. The fireclay liner shall
run from the outer surface of the brick wall to, but not beyond, the inner surface of the chimney flue and shall be firmly cemented
in place. See Part A.
MINIMUM CHIMNEY CLEARANCES FROM MASONRY TO
SHEET STEEL SUPPORTS AND COMBUSTIBLES 2 IN.
FIGURE 12, PART B
FACTORY-BUILT
MINIMUM CLEARANCE
CHIMNEY LENGTH
9 IN. ALL AROUND
NONSOLUBLE
REFACTORY
CEMENT
CHIMNEY CONNECTOR
TO HEATER
CHIMNEY LENGTH
FLUSH WITH INSIDE
OF FLUE
USE CHIMNEY MFRS. PARTS TO
ATTACH CONNECTOR SECURELY
AIR SPACE
9 IN. MINIMUM
SOLIDINSULATED, LISTED
FACTORY-BUILT CHIMNEY LENGTH
MASONRY CHIMNEY CONSTRUCTED
TO NFPA 211
SHEET STEEL SUPPORTS
(24 GAUGE MIN. THICKNESS)
2. Use a solid insulated listed factory-built chimney length having an inside diameter of 6" and having 1" or more of solid insulation.
There must be at least a 9" air space between the outer wall of the chimney length and any combustible materials. The inner end
of the chimney length shall be flush with the inside of the masonry chimney flue and shall be sealed to the flue and to the brick ma-
sonry penetration with nonwater-soluble refractory cement. Sheet steel supports which are at least 24 gauge (0.024") in thickness
shall be securely fastened to wall surfaces on all sides. Fasteners between supports and the chimney length shall not penetrate
the chimney liner. See Part B.
FIGURE 12, PART C
MINIMUM CHIMNEY CLEARANCES FROM MASONRY TO
SHEET STEEL SUPPORTS AND COMBUSTIBLES 2 IN.
24 GAUGE
VENTILATED THIMBLE WITH
TWO 1 INCH AIR CHANNELS
CHIMNEY THIMBLE
CHIMNEY CONNECTOR
TO HEATER
TWO VENTILATED AIR
CHANNELS EACH 1 INCH.
CONSTRUCTED OF
SHEET STEEL.
MINIMUM 6 IN. GLASS
FIBER INSULATION ALL AROUND
SHEET STEEL SUPPORTS
(24 GAUGE MIN. THICKNESS)
MASONRY CHIMNEY CONSTRUCTED
TO NFPA 211
3. Use a 10" diameter ventilated thimble made of at least 24 gauge (0.024") steel having two 1" air channels. The ventilated thimble
must be separated from combustible materials by a minimum of 6" glass fiber insulation. The opening inthecombustiblewallshall
be covered and the thimble supported with sheet steel supports which are at least 24 gauge (0.024") in thickness. The sheet steel
supports shall be securely fastened to wall surfaces on all sides and shall be sized to fit and hold the chimney section. Fasteners
used to secure chimney sections shall not penetrate chimney flue liner. See Part C.
11
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MINIMUM CHIMNEY CLEARANCES FROM MASONRY TO
SHEET STEEL SUPPORTS AND COMBUSTIBLES 2 IN.
FIGURE 12, PART D
SHEET STEEL SUPPORTS
CHIMNEY SECTION
MINIMUM CLEARANCE
2 IN. ALL AROUND
1 IN. AIR SPACE TO
CHIMNEY LENGTH
CHIMNEY THIMBLE
CHIMNEY
CONNECTOR
CHIMNEY CONNECTOR
TO HEATER
SOLIDINSULATED, LISTED
FACTORY-BUILT CHIMNEY
LENGTH (12 IN. LONG MIN.)
AIR SPACE
2 IN.
SHEET STEEL SUPPORTS
(24 GAUGE MIN. THICKNESS)
MASONRY CHIMNEY CONSTRUCTED
TO NFPA 211
4. Use an 8" inside diameter solid insulated listed factory-built chimney length which has 1" or more of solid insulation. The minimum
length of this chimney section shall be 12" and will serve as a pass-through for the 6" diameter chimney connector. There must
be at least a 12" air space between the outer wall of the chimney section and any combustible materials. The chimney section
shall be concentric with and spaced 1" away from the chimney connector by means of sheet steel support plates on both ends of
the chimney section. The opening in the combustible wall shall be covered and the chimney section supported on both sides with
sheet steel supports which are at least 24 gauge (0.024") in thickness. The sheet steel supports shall be securely fastened to wall
surfaces on all sides and shall be sized to fit and hold the chimney section. Fasteners used to secure chimney sections shall not
penetrate chimney flue liner. See Part D.
5. A listed factory-built wall pass-through system may be purchased and installed according to the instructions packaged with it to
provide a safe method of passing the chimney connector through a combustible wall for connection to a masonry chimney.
Additional requirements pertaining to Figure 8 and the above wall pass-through systems:
1. Insulation material used as part of wall pass-through system shall be of noncombustible material and shall have a thermal conduc-
tivity of 1.0 Btu • in./ft.² • °F (4.88 kg • cal/hr • m² • °C) or less.
2. All clearances and thicknesses are minimums: larger clearances and thickness are acceptable.
3. A chimney thimble, as shown for 3" and 4" above (Parts C and D) shall be for types "3" and 4" connections to facilitate removal
of the chimney connector for cleaning. The chimney thimble shall be of ASTM C315 fireclay with 5/8" minimum wall thickness, or
material or equivalent durability. The inside diameter of the thimble shall be sized for the proper snug fit of a 6" diameter chimney
connector pipe. The thimble shall be installed without damage to the chimney flue. The thimble shall extend through the chimney
wall to, but not beyond, the inner surface of the chimney flue and shall be permanently cemented in place with high temperature
cement.
4. A chimney connector to a masonry chimney, except for 2" above (Part B), shall extend through the wall pass-through system to the
inner face of the chimney flue, but not beyond. It does not have to be fastened in place so long as it cannot accidently be pulled
out of the chimney or shoved into the chimney flue. If fasteners are used to secure the chimney connector to a masonry chimney,
the fasteners shall not penetrate the chimney flue liner.
5. Any material used to close up any opening for the connector shall be noncombustible.
PART E - (Figure 12)
In addition to the methods shown by A, B, C, and D of Figure 12, a listed factory-built wall pass-through system may be
purchased and installed according to the instructions packaged with it to provide a safe method of passing chimney con-
nector through a combustible wall for a connection to a masonry chimney.
CONNECTION OF CHIMNEY CONNECTOR TO A MASONRY CHIMNEY WHEN CHIMNEY CONNECTOR
DOES NOT PASS THROUGH A COMBUSTIBLE WALL
If the chimney connector does not have to pass through a combustible wall to get to a masonry chimney, simply connect
the chimney connector directly to the masonry chimney's chimney thimble as described and shown by parts C and D of
Figure 12. Remember, the chimney connector should extend into the chimney thimble to the innerface of the chimney
flue but not beyond; if the chimney connector is extended through the chimney thimble into the chimney flue, resistance
to the flow of smoke and gases up the chimney will occur; that flow resistance will have an adverse affect on the opera-
tion and performance of the heater and venting system.
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Assembly of Furnace
Your furnace requires the following items to be as-
sembled or installed by the service person:
Feed Door Pull Handle
Feed Door Locking Handle
Blowers and Blower Controls
Electrical Connections
1. Remove all parts from inside the furnace and in-
spect for damage, including the firebrick as some
breakage could occur during shipment.
2. Assemble the Damper Box Assembly to the Feed
Door and the Black Knob to the Damper Box if not
already installed. Ensure the damper operates
by sliding the knob up and down. Damper should
operate freely with slight tension.
Figure 13
3. Attach feed door locking handle as in Figure 14
withscrewsandnutsprovided. Note:Slottedholes
are for adjustment of handle. Adjust handle until
some pressure is required to lock feed door during
firing sequence.
4. Install the thermodisc on rear of furnace cabinet
with the two screws provided. Mount the conduit
assembly from the junction box to the thermostat
bracket. Crimp the two female terminals to each
ofthewireleads. Plugthewirestothethermodisc.
NOTE: It does not matter which of the two wires
plugs to which terminal on the thermodisc.
Figure 14
THERMODISC
5. Remove blowers from cartons. Remove junction
box cover. Attach clip nuts as in Figure 15. Install
blower(s) and gasket(s) with 1/4"-20 x 3/4" bolts
as shown.
THERMODISC
COVER
6. Wire right side blower first (See wiring diagram)
and replace cover on junction box on blower.
4”ELECTRICAL
JUNCTION BOX
7. Wireleftblowersameasaboveandreplacecover.
8. Checkoperationofshakergrateswithgratehandle
before operating furnace.
BLOWERS
CLIP NUTS
(Not used in the upper center hole.)
BLOWERS GASKET
Figure 15
(Model 1357M has only one blower)
13
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WIRING DIAGRAM
Figure 16
NOTE:
For model 1357M, disregard the wiring (wires M1 & M2) of
one blower motor.
Wire leads from the distribution blower are usually BOTH BLACK.
Makes no difference which leads from the motor(s) connects to
the corresponding leads coming out of the conduit.
14
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d) Install the smoke pipe connector to the chimney
with 26-gauge pipe and elbows (to be purchased
separately), maintaining the proper clearances
for the specific model. Seal the smoke pipe in
the chimney with furnace cement. (The chimney
connectorshallbesecurelysupported,andjoints
fastened with sheet metal screws or rivets.)
Installation
Please see all methods of Installation at the
rear of this booklet.
This is a furnace, not a free standing stove. You must
directheatedairfrom8"outletsawayfromthefurnace,
or it will not function properly.
e) Install 8" diameter heat pipe to plenum of the
central hot air furnace. Use 26-gauge pipe and
connectors (to be purchased separately). If
central air conditioning is installed in the plenum,
install heat pipe above the air conditioning unit.
Secure heat pipe connection with supports and
sheet metal screws.
1. Thisinstallationmustbedonebyaqualifiedheating
equipment installer.
2. The installation is to be done in compliance with
National Fire Protection Association installation
standards: No. 89M, 90B, 211, 70 (National Electri-
cal Code) and Uniform Mechanical Code 913, 6-4,
in the states where applicable. (Their code offers
connecting smoke pipe connectors into chimney
with other fuel burning appliances.)
f) Connectelectricalsupplyintheelectricaljunction
box that is mounted on the back of the Furnace.
See Wiring Diagram (Fig. 16). Remove the
cover from electrical junction box and connect
power supply wires to wires designated, using
wire nuts. The power cord supplied may be used
for installation, if permitted by local codes and
regulations. If the power cord supplied cannot
be used, the power supply wiring must be 90
degrees centigrade in a metal cable and should
be completed by a qualified installer complying
with NFPA Standard No. 70 and local codes.
3. Rooms large in comparison with size of the appli-
ance:
a) Wood or Coal Burning Furnace needs air for
combustion and circulation to house.
b) Provision must be made to make up this air and
not starve gas or oil furnace of combustion air.
c) Have the "Authority Having Jurisdiction" deter-
mine that air is of adequate makeup. (Reference
N.F.P.A.Nos.30&54,CodeforInstallationofGas
& Oil Equipment).
Power Failure Instructions
Operation after loss of power:
4. Have the"Authority Having Jurisdiction" to inspect
all chimneys and installations for adequate venting
and for compliance with standard and local codes 1. Remove filter if provided
andregulationsregardinginstallationofwoodburn-
ing appliances.
2. Do not expect to keep home at normal tem-
peratures.
5. Installation for Supplemental Heat Application to
Existing Central System.
3. Do not load fuel above bottom of feed door.
a) Place Wood or Coal Burning Furnace so that the
chimney connector will be as short as practical
and avoiding unnecessary sharp turns in the
smoke pipe connector and the installation of
devices that would create excessive resistance
to the flow of flue gases.
b) Locate the Wood or Coal Burning Furnace as
close as practical to the existing central hot air
heatingsystem,maintainingclearancesasstated
on the label on the fuel door.
c) Clearancefromcombustiblematerialsmustcom-
ply with those stated on the label on the side of
the unit. Refer to the clearance table in the front
of this manual.
The installation must be made only on a noncombus-
tible floor.
15
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Operating Instructions
FUEL
Models 1357M & 1557M
Egg size (1-3/16" or larger) bituminous coal for residential furnaces, or any of the specially packed
fireplace coals can be used. Coal with a low ash content (2% to 6%) is recommended.
Hardwood, 18" to 26" should be split and air dried (seasoned) for 6 months.
LIGHTING
1. Set the thermostat on "HIGH" for maximum draft.
2. Open the feed door and place paper and kindling on the grate for starting the fire.
3. Light the fire and close the feed door.
4. Add wood or about 15 lbs. of coal (depending on which model) after fire is burning briskly.
5. "MEDIUM" setting is normally satisfactory. Set higher or lower for your comfort.
ADDING FUEL
When starting a fire, add small amounts of fuel instead of adding large quantities of fuel. This will
give more complete combustion and less build-up of tars or soot in the chimney.
1. Set thermostat to HIGH before opening feed door.
2. Wood fire: Add wood to a convenient level.
3. Coal Fire:
a.) Never smother the fire when adding coal. Gases from the accumulation smoke will explode
under certain conditoins. Add fresh kindling if the bed of coals has cooled.
b.) Add up to 20 lbs. of coal per loading. Never add coal above the bottom of feed door opening.
c.) Stir the coal and watch the fire. Be sure the new coal is burning briskly before you close the
doors and turn the thermostat down.
d.) Shake grates vigorously 1/2" left to right to spill ashes into the ash pan. Do this at least once
every 12 hours of operation. Empty ash pan regularly. Do not allow ashes to build-up to grate
as grate will warp and burnout, and you might spill the ashes when removing the pan. Dispose
of hot ashes properly.
e.) Rotation of the handle (5 o'clock to 7 o'clock) position will agitate coals and spill ashes into
ash pan.
f.) It is advisable for you to get familiar with the shaker grate operation before firing.
16
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4. If the chimney is operating too cool, water will
condense in the chimney and run back into the
furnace. Creosote formation will be rapid and
may block the chimney. Operate the furnace at
a high enough fire to keep the chimney warm,
preventing this condensation.
Service Hints
Do not expect a furnace to draw. It is the
chimney that creates the draft. Smoke spill-
age into the house or excessive build-up of
water or creosote in the chimney are warn-
ings that the chimney is not functioning
properly. Correct the problem before using
furnace. Possible causes are:
5. If the fire burns well, but sometimes smokes or
burns slowly, it may be caused by the chimney
top being lower than another part of the house
oranearbytree. Thewindblowingoverahouse
or a tree, falls on top of the chimney like water
over a dam, beating down the smoke. The top
of the chimney should be at least 3 feet above
the roof and be at least 2 feet higher than any
point of the roof within 10 feet.
1. The connector pipe may be pushed into the
chimney too far, stopping the draft.
2. Do not connect two furnaces or a stove and
furnace into the same chimney flue.
3. The chimney used for a furnace must not
be used to ventilate the cellar or basement.
If there is a cleanout opening at the base of
the chimney, it must be closed tightly.
6. See page 18 for list of trouble shooting tips.
A draft reading of .05 to .06 w.c. is suggested for proper burning of this unit when us-
ing wood or bituminous coal as fuel. When using anthracite coal, this draft reading is a
minimum reading.
Chimney Maintenance
Creosote and Soot - Formation and Need for Removal
When wood is burned slowly, it produces tar and
otherorganicvapors,whichcombinewithexpelled
moisture to form creosote. The creosote vapors
condense in the relatively cool chimney flue of a
slow-burning fire. As a result, creosote residue
accumulates on the flue lining. When ignited, this
creosote makes an extremely hot fire.
CAUTION
A chimney fire may cause ignition
of wall studs or rafters which you
thought were a safe distance from
the chimney. If you have a chimney
fire,haveyourchimneyinspectedby
aqualifiedpersonbeforeusingagain.
When coal is burned, the products of combustion
combinewithmoisturetoformasootresiduewhich
accumulates on the flue lining. When ignited, this
soot makes an extremely hot fire.
The chimney should be inspected at least twice
monthly during the heating season to determine
if a creosote or soot build up has occurred.
If creosote or soot has accumulated, it should be
removed to reduce the risk of a chimney fire.
Chimney fires burn very hot. If the chimney
catches fire, immediately call the fire department,
then reduce the fire by closing the inlet air control.
Pour a large quantity of coarse salt, baking soda
or cool ashes on top of the fire in the firebox.
17
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Trouble Shooting Tips for Warm Air Furnace
1. Problem:
E. Makesureyou’renotsuffocatingthefirewithexces-
sive amounts of unburned wood.
Smoke puffs from furnace
F. Slide baffle should be pulled out prior to load door
opening.
Solution:
A. Checkchimneydraft.Checkforblockedchimneyor
flue pipe. Use mirror to check chimney clearance.
4. Problem:
Distribution blower vibrating
Solution:
B. Check ash pit — if it is too full, empty.
C. Make sure furnace room is not too airtight.
A. Tighten blower wheel to motor shaft.
B. Check for bad fan bearings.
D. Make sure all of chimney mortar connections are
airtight.
5. Problem:
E. Check ash drawer. Make sure it’s airtight.
Distribution blower continues to run or will not run
Solution:
F. Check chimney for possible down-draft caused
by taller surrounding trees or objects. Correct with
proper chimney vent cap.
A. Check fan limit or heat sensor and cable.
G. Check the possibility of a cold chimney forcing cool
gases backward. Remedied by properly insulat-
ing chimney with non-combustible liner — non-
combustible insulation.
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.
H. Fuel may be too green.
6. Problem:
I. Make sure no other fuel burning devices are con-
nected to the chimney impairing the draft.
Odor from first fire
Solution:
J. Check chimney draft, it should be .06 inches of
water column. This service is provided by a certi-
fied chimney sweep.
A. The odor from new steel should disappear in a few
hours.
2. Problem:
B. If the odor remains, call you dealer immediately. A
bad weld can cause a fume leak.
Inadequate heat being delivered to your home
Solution:
7. Problem:
Excessive Creosote
A. Check home insulation — is it adequate?
B. Checkhook-uptofurnace—isitinstalledcorrectly?
Solution:
A. Check the grade of wood you are burning.
C. Cool air inlet may be inadequate or furnace room
too airtight.
B. Make sure your unit is serviced by its own proper
chimney.
D. Your wood fuel may be too low grade. Hardwoods
are recommended.
C. Check length of flue pipe and its connections.
E. Make sure your hot air duct (and other duct work)
is airtight.
D. Make sure you are burning the smallest, hottest fire
to adequately heat your home.
F. If furnace room is warm but your home isn’t, check
back draft dampers.
E. Also see Solutions to Problem one.
8. Problem:
G. Is air to the blower available?
If the fire goes out or does not hold over night
Solution:
3. Problem:
Excess smoke or flames coming out door when refuel-
ing
A. Poor Draft.
B. Incorrect damper settings.
C. Improper firing methods if burning coal.
D. More combustion air needed.
Solution:
A. Wait 15 seconds and open door SLOWLY — then
refuel.
E. Coal not sized to the furnace. We recommend 1”
to 3” diameter pieces of coal.
B. Check length of flue pipe to chimney. Your unit
should be within six (6) feet of your chimney.
F. Ashes, if allowed to accumulate in the ash pit, will
not allow passage of the required air for combus-
tion. Keep ash pit clean.
C. Make sure chimney cap is not too close to the top
of the chimney.
D. Check chimney draft — make sure chimney flue
pipe is clean and chimney is of adequate height.
G. This furnace is not to be used with an automatic
stoker unless so certified.
18
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Parts List
Key Part No. Description
Model
Qty.
Key Part No. Description
Model
Qty.
1357M
1557M
1357M
1557M
1357M
1557M
1357M
1557M
1357M
1557M
25541G
1
2
1
2
4
8
4
8
1
1
1
1
1
10
12
2
1
2
1
2
1
1
1
1
1
1
3
3
1
1
1
1
1
Cabinet Side (Left & Right)
2
26
27
80230
89319
83340
83339
Blower
25467G
88032
2
Flue Collar Gasket
Flue Collar
2
1
6
6
Gasket, Blower
1/4-20 Clipnut
Bolt (1/4-20 x 3/4")
3
40246
N/S
N/S
83227
Bolt, 1/4-20 x 1"
Kep Nut, 1/4-20
28
83250
1357M
1557M
1357M
1557M
25540G
23459G
25561G
25466G
4
5
Cabinet Back
Cabinet Top
1
1
N/S
29
30
31
32
33
22140
80131
80231
80314
68234
Relay Box Bracket
Junction Box (4 x 4)
Junction Box Cover
Thermodisc (60T12)
Blower Thermostat Bracket
N/S
6
891214 8" Collar
2
1
1
1
1
1
1
1
1
1
1
2
1
2
2
2
68217
22662
24232
Feed Door Assy. (Includes Gasket - 88057)
7
Bracket, Feed Door
Spacer, Hinge
1357M
1557M
1357M
1357M
1557M
1357M
1557M
8
34
35
36
89066
40264
40256
Firebrick (4.5 x 9 x 1.25)
Liner, Front/Rear
9
891097 Locking Mechanism, Feed Door
10
11
12
13
14
15
16
17
18
19
20
68218
86626
83461
83274
Ash Door Assy. (Includes Gasket - 88066)
Latch, Door
Grate Frame, Shaker
Washer (1" OD, 7/16" ID)
Lock Nut, 3/8-16
37
40257
Grate, Shaker
891098 Handle Assy. w/Handle Bushing
23859B Draft Cap, Painted
38
39
40
41
42
43
44
45
46
47
48
49
40260
40258
40269
69396
25200
89041
83278
83244
89943
Handle, Shaker
Liner - Rear
89574
23800
23787
83445
83250
68238
68228
23397
23398
Handle, Spring
1557M
1557M
Smoke Curtain
Liner - Front
Clip, Smoke Curtain
1/4-20 x 1-1/4 Carriage Bolt
Kep Nut, 1/4-20
Control Plate Assembly
Slide Damper
Spring
1357M
1557M
1357M
1557M
#10 Flat Washer
10-24 Kep Nut
Knob, Slide Damper
21
22
Ash Pan
1
1
2
1
1
1
Baffle, Flue
25197G Control Box Cover
25199G Pull Handle
23
24
25
22761B Flue Collar Ring
22762B Forced Draft Ring
83895
10-24 x 1-3/4 CS Machine Screw
86402
1-1/2" Pipe Plug
N/S = Not Shown
Color Code: G = Green
20
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Optional Equiptment
11DIKL Draft Inducer Kit w/ Limit Swich
This optional kit allows your furnace to be thermostati-
cally controlled and gives the option to change the on/off
times of the distribution blower(s).
UFB908 Universal Filter Box
When installing ANY warm air furnace, proper installation
is the key and required for getting the most efficiency and
longest life out of your unit. Failure to install your furnace
as outlined from the manufacturer, often will result in in-
adequate heating and problems associated with drafting.
U. S. Stove Co. offers the UFB908, a universal filter box
that mounts to the rear of the unit that your return air duct
work will attach to. It uses a standard 16 x 20 x 1 filter
(NOT INCLUDED) to reduce the amount of dust particles
from being transfered thru you duct work system.
11DIKL
DR-6 Barometric Damper Regulator
In the unlikely event that your furnace “overfires” (a con-
dition evidenced by elbows, stove pipes, and connectors
glowing red in appearance or otherwise discoloring),
then your installation is subject to excessive draft cre-
ated by either a chimney too tall or too great in diameter
in conjunction with its height, or some other factor of an
indeterminate cause. In this event, you should install a
barometric draft regulator. Such installation will preclude
any over-firing and/or any hazardous consequences of
potential overfiring.
Barometric draft regulators are generally available where
you purchased your stove or may be ordered directly
from United States Stove Company at a nominal charge.
UFB908
DR-6
21
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Bulletin rc454
A GUIDE TO BURNING COAL IN YOUR FURNACE
Furnaces that are capable of burning coal usually
sult, should be fired with the “conical method” - with
the highest portion of your fire bed in the center of
the firebox. The first flames will be long and gen-
erally orange or yellow and produce quite a bit of
smoke. As the gases burn off the flames become
shorter, change color and produce less smoke.
will burn both Bituminous and Anthracite coal. An-
thracite is perhaps the best coal fuel because of its
long even burn time, high heat output, and clean-
liness which make it a good choice for the home.
However, keep in mind it is a much more difficult
fuel to use, requires more care and patience, is not
so widely available, and is usually much more ex-
pensive than Bituminous.
Once the fire is WELL ESTABLISHED add coal to
the center of the firebox forming the cone. Burning
in this fashion allows heat to drive off the volatile
gases, and turbulence created increases the burn
efficiency. There will have to be some experiment-
ing with the individual setup as no two chimney’s
or installations are going to be the same. Just re-
member to allow enough air to enter the firebox 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 care-
ful 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. The objec-
tive is to remove a small amount of the ashes with-
out disturbing the fire. Stop when you see a glow in
the ashes or the first red coals fall into the ash pan.
Excessive shaking wastes fuel and can expose the
grate(s) to very high temperatures which can cause
warpage or burnout.
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” diam-
eter). When burning Anthracite, use “egg” or “bro-
ken” 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. Clean-
ing insures removal of rocks and other minerals.
Never use coal smaller than 1” or larger than 5” in
diameter. Small sized coal will smother the fire. Too
large a size of coal will not burn well.
STOVE OPERATION:
All coal fires should be started with wood which will
allow the fire to get hot enough to ignite the coal.
The best ignition fires utilize dry pine or other resin-
ous soft woods as kindling, with hard wood (oak,
hickory, ash) added to increase the heat prior to ad-
dition of the coal.
For overnight operation (long duration burn time)
shake the fire and add coal, retaining the cen-
ter cone. Once the volatiles are burned off, close
the feed door and adjust the stove pipe damper, if
epuipped. Then adjust the thermostat to the desired
heat level.
Before starting the fire, open the stove pipe damper
(if epuipped), turn the thermostat to high, open the
ash pit door and feed door, place newspaper and
finely split kindling on the grate, light the paper, add
larger hard wood after the kindling is burning bright-
ly. CAUTION: Never use gasoline, lantern fuel, ker-
osene, charcoal lighter fluid, or other flammable liq-
uids to start or freshen up a fire in any heater. Place
the larger pieces of wood on the fire 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 fire.
More MAINTENANCE will be needed with bitumi-
nous 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 fire, being careful not to disturb it too
much or cut off the draft. Then, add a second heavi-
er layer after the coal is ignited 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.
BURNING BITUMINOUS:
Once your kindling and wood fire 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 content and, as a re-
22
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Bulletin rc454
a guide to Burning coal in your furnace
Before adding further fuel, be sure to leave a red
BANKING THE FIRE:
spot of glowing coals in the center of the firebox to
insure that the fire has not been smothered and to
help ignite the gases given off by the new charge. A
deep charge will give a more even heat and a lon-
ger fire, but it may take one to two hours before the
whole bed is fully ignited.
For extended operation, such as overnight, the fire
will need to be banked. To do so heap coal up along
the sides and back of the firebox so that the fire
gradually burns it over a longer period of time. The
intensity of the fire will also be reduced without let-
ting it go out. Follow the same procedure as for refu-
eling. If possible, avoid shaking, as a heavier layer
of ash will help reduce the intensity of the fire during
this time. After loading, let the fire establish itself
for about 30 minutes. Then close your damper and
automatic control to the point where the house does
not become too cold. It is important that you begin
banking early enough before retiring or leaving that
you can make necessary adjustments after the fire
is well established.
When the fire is well established and the room is
becoming warm, partially close the dampers. Some
experimenting will have to take place with each par-
ticular setting of all dampers and controls as the
chimney provides the draft 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 draft 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 fire from going out. Adjust the stove
pipe damper to reduce the draft on the fire. With
anthracite there will be short blue flames above the
coal, except when the fire is started or a new charge
is added. If, however, there is no flame then the fire
needs more air from the bottom (unless it is near the
end of its burn cycle and needs to be recharged).
To revive a coal fire 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 draft through
the grate. (2) place a thin layer of dry coal over the
entire top of the fire. DO NOT POKE OR SHAKE
THE FIRE AT THIS TIME! (3) after the fresh coal
has become well ignited shake the grate (just a lit-
tle), refuel.
DO NOT burn coke, charcoal, high volatile bitumi-
nous coal, sub bituminous, lignite or cannel coal
(sometimes called channel coal or candle coal).
Only when the coal is burned down to half its origi-
nal 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 fire to burn off
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 firebox. Try not to
disturb the fire too much. Next, add a fresh charge
to the back being careful not to seal off the top.
Close the feed door, but leave the spin damper (or
thermostat) open for a few minutes until the volatile
gases have burned off. It is not necessary to shake
down the ashes each time you refuel the furnace.
Experience will be your best teacher.
NEVER burn wax or chemically impregnated saw-
dust logs - their intended use is for fireplaces only.
NEVER fill the stove or furnace above the firebrick
or cast iron liner.
23
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CENTRAL INSTALLATION
ADD-ON INSTALLATION
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Appendix
INSTALLATION A
TO EXISTING
DUCT WORK
COLD AIR
RETURN
WARM AIR
EXISTING FURNACE
SOLID FUEL
FURNACE
FILTER BOX
INSTALLATION B
TO EXISTING
DUCT WORK
PLENUM
COLLECTOR
BOX
WARM AIR
COLD AIR
RETURN
EXISTING
FURNACE
SOLID FUEL
FURNACE
FILTER BOX
INSTALLATION C
TO EXISTING
DUCT WORK
COLD AIR
RETURN
WARM AIR
PLENUM TOP
(OPTIONAL)
EXISTING
FURNACE
FILTER BOX
SOLID FUEL
FURNACE
25
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INSTALLATION D
INSTALLATION E
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INSTALLATION F
INSTALLATION G
INSTALLATION H
TOP VIEW
FRONT VIEW
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How to order repair parts
THis MAnuAL WiLL HeLp yOu OBTAin eFFiCienT, dependABLe serviCe FrOM
yOur FurnACe, And enABLe yOu TO Order repAir pArTs COrreCTLy.
Keep THis MAnuAL in A sAFe pLACe FOr FuTure reFerenCe.
WHen WriTing, ALWAys give THe FuLL MOdeL nuMBer WHiCH is On
THe nAMepLATe ATTACHed TO THe HeATer.
WHen Ordering repAir pArTs, ALWAys give THe FOLLOWing inFOr-
MATiOn As sHOWn in THis LisT:
1. THe pArT nuMBer
2. THe pArT desCripTiOn
3. THe MOdeL nuMBer: 1357M 1557M
4. THe seriAL nuMBer:____________________
united states stove Company
A
227 industrial park road
I
p.O. Box 151
south pittsburg, Tn 37380
S
C
U
S
(800) 750-2723
WWW.ussTOve.COM
P
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