United States Stove Furnace AIR User Manual

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MODEL 1303  
Owners Manual  
SOLID FUEL WARM AIR FURNACE  
ASSEMBLY  
INSTALLATION  
OPERATION  
REPAIR PARTS  
CAUTION  
IMPROPER INSTALLATION  
MAY VOID YOUR WARRANTY  
SAVE THIS MANUAL FOR  
FUTURE REFERENCE  
READ ALL INSTRUCTIONS CAREFULLY  
BEFORE STARTING THE INSTALLATION  
OR OPERATING THE FURNACE  
FOR PARALLEL INSTALLATION WITH EXISTING AIR, GAS OR OIL FIRED FURNACE  
OR FOR INSTALLATION AS A CENTRAL FURNACE  
DO NOT USE THIS FURNACE IN A MOBILE HOME OR TRAILER  
UNITED STATES STOVE COMPANY  
WARNOCK HERSEY  
227 Industrial Park Rd., P.O.Box 151  
South Pittsburg, TN 37380  
S
C
U
S
R
(423) 837-2100  
P
85759H 12/96  
 
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 fuel or other combustible material within the marked  
installation clearances.  
DO NOT store fuels, paints, thinners, flammable liquids, or other highly  
volatile substances in the furnace room.  
CAUTION: HOT SURFACES  
Keep children away.  
Do not touch during operation  
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 officials about restrictions and installation  
inspection requirements in your area.  
3
 
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. Check your local codes. The installation must comply with their rulings.  
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 pro-  
hibited 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,(See Page 8)  
5. Be sure to use a masonry chimney that 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 (See Chimney Maintenance,  
page 18).  
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.  
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.  
10. For further information on using your furnace safely, obtain a copy of the National Fire  
Protection Association (NFPA) publication "Chimneys, Fireplaces, and Solid Fuel Burning  
Appliances" NFPA 211. The address of the NFPA is Batterymarch Park, Quincy, MA  
02269.  
11. Keep the ash pit section free of excess ashes. Do not allow ashes to stack higher than  
the sides of the ash pan.  
12. DISPOSAL OF ASHES - Place ashes in a metal container with a tight fitting lid. Keep the  
closed container on a noncombustible floor or on the ground, well away from all combus-  
tible 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.  
13. CAUTION - The special paints used on your furnace may give off some smoke while they  
are curing during the first few fires. Build small fires at first. The metal used in construc-  
tion of the furnace and duct work has a light coating of oil. This could give off smoke and/  
or odors 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.  
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 is not hot. DO NOT use  
any acids or scouring soap, as these wear and dull the finish. DISCOLORATION WILL  
OCCUR IF THE FURNACE IS OVERFIRED, FOLLOW OPERATING INSTRUCTIONS  
CAREFULLY.  
15. Keep the feed and ash doors closed at all times, except while tending the furnace.  
Your furnace is designed to be installed in a parallel air flow arrangement with a gas or oil- fired forced  
air flow - type central furnace, or it may be installed as a central furnace.  
4
 
How The Furnace Functions  
YourModel1303Furnaceisdesignedto PARALLEL INSTALLATION: The design is  
be a supplemental or central heating source for suchthatwhentheblowercomeson,theblower  
your home. This solid fuel furnace may be will only come on when the temperature in the  
installed in conjunction with a properly operat-  
ing central furnace that is listed or certified in  
accordance with nationally recognized safety  
standards and equipped with the required con-  
plenum has reached the setting on the blower  
control. This is to insure that there is sufficient  
warmairinthesystemtomakeitefficientforthe  
unit to operate. When the central system ther-  
trols and other safety features and which has mostat calls for heat, the central system will  
been installed in accordance with appropriate operate by the burner igniting and the blower  
standards of the National Fire Protection Asso-  
ciation with installation clearances specified in  
coming on. It is possible that both systems will  
operate simultaneously. It is recommended  
the furnace nameplate marking. The installa- that for the most efficient use of your Supple-  
tionmustbeaccomplishedbyaqualifiedagency  
(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  
mental Furnace, that it be fired as much as  
possible in order to reduce the demand on your  
existing central heating system.  
TheWarmairsupplyoutletoftheSupple-  
heating appliances, who is experienced in such mentary Furnace shall not be connected to the  
work, familiar with all precautions required, and  
has complied with all the requirements of the  
authority having jurisdiction.) The installation  
shall be in strict accordance with the  
manufacturer'sinstallationinstructionsfurnished  
with the solid fuel furnace.  
cold air return inlet of the central furnace be-  
cause the possibility exists of components of  
thecentralfurnaceoverheatingandcausingthe  
centralfurnacetooperateotherthanisintended.  
CENTRAL FURNACE INSTALLATION: As a  
The chimney connector of the furnace is centralfurnace,theunitfunctionsindependently  
tobeinstalledtoprovideclearancestocombus- of any other system. The blower will come on  
tible material not less than specified in the  
individual classifications and marked on the  
furnace. The chimney connector must be con-  
nected to a chimney suitable for use with resi-  
dentialtypeorbuildingheatingapplianceswhich  
burn solid fuel.  
when the plenum temperature reaches the set-  
ting on the blower control.  
The Model 1303 Furnace is designed to  
operate in a parallel air flow arrangement with  
an existing central furnace or as a central fur-  
nace. The furnace is designed to operate in  
either of the following installations:  
5
 
1303  
DIMENSIONS  
Shown in Fig. 1 are the dimensions of the furnace.  
41  
Fig. 1  
20  
32-1/8  
2
30 - 9/16  
36 3/8  
6
 
18"  
Locating the Furnace  
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.  
CENTRAL  
FURNACE  
12"  
9"  
See Fig. 2.  
Fig. 2  
48"  
2. The unit will require installation with the  
following clearances:  
Unittosidewall....................................12"  
Unit to backwall..................................30"  
Chimney connector pipe to sidewall  
.........................................................21"  
Chimney connector pipe to backwall  
.........................................................18"  
Hot air ducts to combustibles................6"  
18"  
NOTE: Install only on a noncombustible  
floor. (REFER TO FIG. 2 & 3)  
6" SOLID DAMPER  
3. Place the furnace on a noncombustible  
floor.  
6" BAROMETRIC  
DRAFT REGULATOR  
(OPTIONAL)  
4. Check figures 2 and 3. Be sure you  
have the clearances shown from the fur-  
nace and the connector pipe to combus-  
tible surfaces. If you have a solid brick or  
stone wall behind your heater, you can  
place the furnace as close as you wish to  
the wall. If the wall is only faced with brick  
or stone, treat it as a combustible wall.  
18"  
Fig. 3  
NON-COMBUSTIBLE FLOOR  
7
 
18" MIN. CLEARANCE FROM  
FROM CEILING TO TOP OF  
CONNECTOR  
THIMBLE  
6" ELBOW  
6" SOLID DAMPER  
6" BAROMETRIC  
DRAFT REGULATOR  
(OPTIONAL)  
6" CHIMNEY  
CONNECTOR  
NON-COMBUSTIBLE  
WALL  
6" ELBOW  
Chimney Connection  
Fig. 4  
MASONRY CHIMNEY  
Before using an existing masonry chimney, clean the chimney and inspect the flue liner to be sure  
it is safe to use. Make repairs before attaching the furnace. See page 4, item 5. Look at Fig. 4.  
The connector pipe and fittings you will need to connect directly to a masonry chimney are shown.  
The chimney connection should be as short as possible.  
If the connector pipe must go through a combustible wall before entering the masonry chimney,  
consult a qualified mason or chimney dealer. The installation must conform to local fire codes, and  
N.F.P.A. 211.  
DO NOT CONNECT THIS FURNACE TO A CHIMNEY FLUE SERVING ANOTHER APPLI-  
ANCE.  
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, close it tightly.  
REFER TO CHIMNEY  
2' MIN.  
MANUFACTURER'S  
INSTRUCTIONS AND  
PARTS.  
10'  
3' MIN.  
6" SOLID DAMPER  
6" BAROMETRIC  
DRAFT REGULATOR  
(OPTIONAL)  
6" CHIMNEY CONNECTOR  
6" ELBOW  
Fig. 5  
LISTED FACTORY BUILT CHIMNEY  
Carefully follow chimney manufacturer's instructions. Use only a Listed Residential Type or  
Building Heating Appliance Chimney. If your chimney starts at the ceiling (Fig. 5), you will need  
enough 6" pipe to reach the ceiling.  
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. 5).  
8
 
Rules for Connector  
Pipe Installation  
1. The crimped end of the chimney connector fits  
inside the furnace flue collar. Install additional chim-  
ney connectors and elbow with the CRIMPED END  
TOWARD 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 al-  
though blued steel is satisfactory, high temp painted  
black is much more desirable.  
2. Slope any horizontal pipe upward toward the  
chimney at least 1/4 inch for each foot of horizontal  
run.  
RIGHT  
WRONG  
WRONG  
3. You must have at least 18 inches of clearance  
between any horizontal piping and the ceiling.  
(See Fig. 3)  
Fig. 6  
4. The chimney connector must not extend into the  
chimney flue. (See Fig. 6)  
5. Seal each chimney connector pipe joint with fur-  
nace cement. Also seal the pipe at the chimney.  
6. Use 3 sheet metal screws at each chimney pipe  
joint to make the piping rigid.  
7. The chimney connector may include a section for  
abarometricdraftregulatorbetweenthefurnaceand  
the chimney (fig. 4,5, &7). The barometric draft  
regulator must be installed in the same room (same  
pressure zone) as the furnace.  
NON-COMBUSTIBLE  
INSTALLATION PER  
NFPA 211  
8. Install the barometric draft regulator strictly in  
accordance with the instructions that are provided  
with the barometric draft regulator.  
9. A solid damper must be used in the chimney  
connecting pipes between the flue collar and the  
chimney. When used in conjunction with a baromet-  
ric draft regulator, the solid damper must be placed  
between the barometric and the chimney. (See Fig.  
4,5,7)  
6" SOLID DAMPER  
6" BAROMETRIC  
DRAFT REGULATOR  
(OPTIONAL)  
MEASURE FLUE  
DRAFT HERE  
Adjusting the Barometric Draft Regula-  
tor  
Fig. 7  
1. Drill a hole in the chimney connector within 18" or  
the flue collar below the barometric draft regulator  
just large enough for the tube of the manometer.  
2. Build a fire after all chimney connections have  
been made.  
3. Use a manometer to measure the draft in the flue,  
(U. S. Stove Model DG-26).  
4. Adjust the Barometric Draft Regulator to obtain a  
draftof0.05-0.06"W.C. understablefireconditions.  
9
 
Assembly of Furnace  
Your furnace requires the following items to be assembled or installed by the service person:  
BLOWER AND BLOWER CONTROLS  
ELECTRICAL CONNECTIONS  
1.Removeallpartsfrominsidethefurnaceandinspectfordamage. Includingthefirebrick,assome  
damage could have occurred during shipment.  
2. Place base assembly in area where furnace will be installed, and place furnace on base as  
shown in Figure 8. Be certain furnace fits inside tabs as shown.  
3. Install Honeywell Fan/Limit Control on rear of cabinet as shown in Fig. 8.  
NOTE: Remove cover of Fan/Limit control for access to screw holes.  
4. Remove blower from carton and inspect for damage. Remove cover from 4" junction box on rear  
of furnace. (See Fig. 8)  
5. Attach clip nuts to blower opening on rear of furnace as shown. Install blower and gasket using  
1/4-20x3/4" bolts provided.  
6. Completeallwiringin4"junctionboxbyreferencetowiringdiagram, Fig. 9, Page11. Afterwiring  
is completed, remember to replace junction box cover.  
Fig. 8  
Honeywell  
FAN/LIMIT  
CONTROL  
4" ELECTRICAL  
JUNCTION BOX  
BLOWER  
ASSEMBLY  
CLIP NUTS  
NOTE: DO NOT USE CLIP NUT OR BOLT  
ON UPPER CENTER HOLE  
GASKET  
10  
 
Model 1303 Wiring Diagram  
LOAD  
FAN  
LINE  
LOAD  
LIMIT  
LINE  
FAN "OFF"  
INDICATOR  
LIMIT  
INDICATOR  
BREAK OFF  
JUMPER FOR  
LOW VOLTAGE  
FAN "ON"  
INDICATOR  
Honeywell  
LIMIT SWITCH  
R2  
R1  
WIRE COLOR CODE  
G- GREEN- GROUND  
B- BLACK- POWER SUPPLY  
W- WHITE- POWER SUPPLY  
R1- WHITE- FAN CONTROL  
R2- BLACK- FAN CONTROL  
M1- BLACK- FAN CONTROL  
M2- WHITE- BLOWER MOTOR  
GROUND  
G
POWER  
CORD  
G
B
W
110  
VAC,  
60  
W
HZ.  
ELECTRICAL JUNCTION BOX  
M2  
M1  
BLOWER  
MOTOR  
IMPORTANT: POWER SUPPLY WIRING MUST NOT BE LESS THAN 90 CENTIGRADE.  
Fig. 9  
11  
 
Installation  
Please see all methods of Installation in  
Appendix at the rear of this booklet.  
Pipe to combustible:  
Sides: 21"  
Back: 18"  
The installation must be made only on a noncom-  
bustible floor.  
This is a furnace, not a free standing stove.  
Youmustdirectheatedairfrom8"outletsawayfrom  
the furnace, or it will not function properly.  
d) Install the smoke pipe connector to the chim-  
ney with 26-gauge pipe and elbows (to be pur-  
chased separately), maintaining the proper clear-  
ances for the specific model. Seal the spoke pipe in  
the chimney with furnace cement. (The chimney  
connector shall be securely supported, and joints  
fastened with sheet metal screws or rivets.)  
e) Install 8" diameter heat pipe to plenum of the  
central hot air furnace. Use 26-gauge pipe and  
connectors (to be purchased separately). (See Fig.  
14) 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.  
f) Connect electrical supply in the electrical junc-  
tion box that is mounted on the back of the Model  
1303 Furnace. See Wiring Diagram (Fig. 12 or Fig.  
13). Remove the cover from electrical junction box  
and connect power supply wires to wires desig-  
nated, 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.  
1. This installation must be done by a qualified  
heating equipment installer.  
2. The installation is to be done in compliance with  
NationalFireProtectionAssociationinstallationstan-  
dards: No. 89M, 90B, 211, 70 (National Electrical  
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.)  
3. Rooms large in comparison with size of the  
appliance:  
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 "Authority Having Jurisdiction" deter-  
mine that air is of adequate makeup. (Reference  
N.F.P.A. Nos. 30&54, Code for Installation of Gas &  
Oil Equipment).  
4. Have"AuthorityHavingJurisdiction"istoinspect  
all chimneys and installations for adequate venting  
and for compliance with standard and local codes  
and regulations regarding installation of wood burn-  
ing appliances.  
g) Optional Plenum Fan Control Switch (Part No.  
11PCS) is available for installation on the plenum of  
central hot air heating furnace. The purpose of this  
switch is to activate the circulating fan of the central  
hot air heating furnace when the temperature in the  
plenum exceeds 120 degrees F., and shut off the  
fan when the temperature in the plenum is reduced  
to 100 degrees F. This avoids overheating the  
plenum.  
5. Installation for Supplemental Heat Application to  
Existing Central System. (See Fig. 2 for typical  
installation.)  
a) Place Wood or Coal Burning Furnace so that  
the chimney connector will be as short as practi-  
cable and avoiding unnecessary sharp turns in the  
smoke pipe connector and the installation of de-  
vices that would create excessive resistance to the  
flow of flue gases.  
The electrical supply for operation of this fan  
control switch is to be obtained from the same  
electrical supply as the central hot air heating sys-  
tem. (See Fig. 14) Follow the instructions of the  
wiring diagram (Fig. 5) Do not make connections  
across Limit Control in the furnace.  
b) Locate the Wood or Coal Burning Furnace as  
close as practical to the existing central hot air  
heating system, maintaining clearances as stated  
on the label on the fuel door.  
c) Clearance from combustible materials must  
comply with those stated on the label on the fire  
Make electrical wire connections in accordance  
with NFPA Standard No. 70 and local codes in the  
power supply junction box (See Fig. 15). The wiring  
to complete the connections should be 18 AWG  
minimum copper and 90 degrees centigrade in a  
cable.  
door:  
Unit to combustible:  
Front: 48"  
Back: 30"  
Sides: 12"  
Plenum to Ceiling: 6"  
12  
 
Repair Parts List Model 1303  
KEY  
PART NO.  
DESCRIPTION  
QTY.  
1
2
3
4
5
6
23466  
23464  
88032  
40246  
22761  
83086  
83227  
83250  
23462  
23465  
23467  
23469  
23468  
23470  
68546  
68607  
68699  
17350  
17130  
89066  
40076  
67444  
22538  
22539  
68560  
89503  
67743  
89142  
23463  
23303  
89354  
89354  
88033  
88033  
68561  
88064  
68587  
23193  
22247  
66080  
22090  
22171  
83086  
83250  
83872  
68229  
83339  
83340  
89319  
80154  
80145  
80231  
80232  
68231  
68232  
85759  
87064  
89284  
Cabinet Left Side  
1
Cabinet Back Panel  
Flue Collar Gasket  
Flue Collar  
1
1
1
1
4
2
1
1
1
1
1
1
1
1
1
1
2
1
10  
1
1
1
1
1
1
1
1
1
1
1
1
44"  
29"  
1
1
1
1
1
2
1
2
3
3
1
1
5
5
1
1
1
Flue Collar Ring  
Flue Collar Mounting Bolts 1/4-20x3/4"  
Flue Collar Mounting Bolts 1/4-20x1"  
Flue Collar Mounting Nuts 1/4-20 kep nut  
Cabinet Top Panel  
Cabinet Right Side  
Front Upper Panel  
Right Upper Panel  
Front Bottom Panel  
Front Left Panel  
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
35  
36  
37  
38  
39  
40  
41  
42  
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Firebox Weldment  
Feed Door Assembly (40186)  
Ash Door Assembly (40289)  
Brick Retainer (2ea.)  
Rear Liner  
Firebrick  
Grate  
Ash Pan  
Air Intake Box  
Air Intake Door  
Air Intake Box Cover Weldment  
Thermostat Linkage  
Thermostat  
Thermostat Knob  
Cabinet Bottom  
Access Plate  
Door Handle (Feed Door)  
Door Handle (Ash Door)  
3/8" Rope Gasket  
3/8" Rope Gasket  
Base Assembly  
Air Box Cover Gasket  
Outlet Baffle Weldment  
Baffle Bracket  
Front Firebox Liner  
Grate Liner Support  
Smoke Curtain  
Smoke Curtain Bracket  
Screw/ 1/4-20x3/4 MS,SL,FL  
1/4-20 Kep Nut  
Door Hinge Pin  
Blower Motor Assembly  
Blower Mounting Bolts (1/4-20x3/4")  
Blower Clip Nut (1/4-20"J")  
Blower Gasket  
Cord Strain Relief Bushing  
Blower Limit Control  
Junction Box Cover  
Power Supply Cord  
Limit Control Flex Conduit Assembly  
Blower Flex Conduit Assembly  
Owners Manual  
1
1
13"  
18"  
Red Spray  
Silicone Sealant  
Paint  
*
Not Shown  
13  
 
14  
 
18" MIN.  
2" MIN. AIR SPACE  
REQUIRED BY CODE  
CENTRAL  
FURNACE  
Fig. 10  
Power Failure Instructions:  
Operation after loss of power--  
1. Remove filter if provided  
2. Do not expect to keep home at normal temperatures.  
3. Do not load fuel above bottom of feed door.  
15  
 
Central Installation  
COLD AIR DUCT  
6" PIPE  
90 ELBOW  
DAMPER  
OPTIONAL  
11 RPT  
PIPE  
CONNECTOR  
FURNACE  
Fig. 11  
Add-On Installation  
COLD AIR DUCT  
8" PIPE  
6" PIPE  
90 ELBOW  
DAMPER  
PIPE  
CONNECTOR  
FURNACE  
EXISTING GAS/OIL/ELECTRIC FURNACE  
FIG. 11-B  
16  
 
Operating Instructions  
ADJUSTINGBLOWERLIMITCONTROLSET-  
TINGS  
FUEL, MODEL 1303  
Hardwood, 18" to 26" should be split and air  
dried (seasoned) for 6 months.  
The temperature in the plenum of the warm air  
furnaceatwhichtheblowerturnsonorturnsoff,  
is controlled by the setting of the pointers in the  
blower limit control. (See Fig. 12) These point-  
ers may be adjusted to achieve the desired  
warm air output from the furnace. (See Fig. 12  
Below)  
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 fire and close feed door.  
4. Add wood after fire is burning briskly. Be  
careful not to smother the kindling fire.  
5. Set thermostat for desired temperature.  
"MEDIUM" setting is normally satisfactory. Set  
higher or lower for your comfort.  
ADDING FUEL  
1. Movingbothpointerstowardtheright(counter  
clockwise)- this increases the temperature set-  
ting at which the blower will turn on and off.  
2. Moving both pointers toward the left (clock-  
wise)-thisdecreasesthetemperaturesettingat  
which the blower will turn on and off.  
When starting a fire, use small amounts of fuel.  
This will allow for more complete combustion  
and less buildup of tars or soot in the chimney.  
1. Set thermostat to HIGH before opening feed  
door.  
3. Moving the pointers away from each other  
will increase the time that the blower will run on  
each warm air cycle.  
2. Wood Fire-Model 1303- Add wood to a  
convenient level.  
CAUTION!  
DO NOT OPERATE WITH THE FEED AND/  
OR ASH DOOR OPEN. THIS FURNACE IS  
DESIGNED FOR THERMOSTATIC OPERA-  
TION. OPERATION WITH ANY OF THESE  
DOORS OPEN WILL OVERHEAT AND DAM-  
AGE THE FURNACE.  
BLOWER FAN  
"OFF" POINTER  
BLOWER FAN  
"ON" POINTER  
CAUTION!  
NEVER USE GASOLINE, GASOLINE-TYPE  
LANTERN FUEL, KEROSENE, CHARCOAL  
LIGHTER FLUID, OR FLAMMABLE LIQUIDS  
TO START OR "FRESHEN UP" A FIRE IN  
THE FURNACE.  
BLOWER LIMIT  
POINTER & STOP  
Fig. 12  
WARNING!  
NEVER STORE FLAMMABLE LIQUIDS, ES-  
PECIALLY GASOLINE, IN THE VICINITY OF  
THE FURNACE.  
17  
 
Service Hints  
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 condensa-  
tion.  
Do not expect a furnace to draw. It is the  
chimney that creates the draft. Smoke spillage  
into the house or excessive buildup of water or  
creosote in the chimney are warnings that the  
chimneyisnotfunctioningproperly. Correctthe  
problembeforeusingfurnace. Possiblecauses  
are:  
4.  
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 or a nearby tree. The wind  
blowing over a house or a tree, falls on top  
of the chimney like water over a dam, beat-  
ingdownthesmoke. Thetopofthechimney  
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 (Fig. 5).  
1. The connector pipe may be pushed into the  
chimney too far, stopping the draft (Fig. 6)  
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 19 for list of trouble shooting tips.  
A draft reading of .05 to .06 w.c. is suggested for proper burning of this unit when using  
wood.  
Chimney Maintenance  
Creosote and Soot - 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. The creo-  
sote vapors condense in the relatively cool  
chimney flue of a slow-burning fire. As a result,  
creosote residue accumulates on the flue lin-  
ing. When ignited, this creosote makes an  
extremely hot fire.  
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 depart-  
ment, thenreducethefirebyclosingtheinletair  
control. Pour a large quantity of coarse salt,  
baking soda or cool ashes on top of the fire in  
the firebox.  
When coal is burned, the products of combus-  
tion combine with moisture to form a soot resi-  
duewhichaccumulatesonthefluelining. When  
ignited, this soot 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, have your  
chimney inspected by a qualified per-  
son before using again.  
The chimney should be inspected at least twice  
monthly during the heating season to deter-  
mineifacreosoteorsootbuilduphasoccurred.  
18  
 
Trouble Shooting Tips for Warm Air Furnace  
LIST OF PROBLEMS  
POSSIBLE CAUSE  
SOLUTIONS  
1. Smoking when feed door is  
open.  
a) Insufficient Draft.  
b) Clogged chimney or chimney  
connector.  
a) Set thermostat higher.  
b) Clean chimney.  
c) Add raincap to chimney.  
c) Down draft in chimney  
2. Furnace does not heat.  
3. Blower does not run.  
a) Wood not seasoned and dry.  
a) Allow wood to season in a dry,  
well ventilated area for 6 mo.  
b) Set blower control to higher  
temperatures.  
b) Blower control set too low.  
c) Insufficient flue draft.  
c) Set flue draft. (See page 9)  
a) Improperly wired.  
b) Bad blower control.  
c) Bad relay.  
a) Wire unit properly.  
b) Replace blower control.  
c) Replace relay.  
d) Bad blower motor.  
d) Replace blower.  
4. No air from registers-  
fan running.  
a) Registers are closed.  
a) Open registers.  
b)Correctductworkinstallations.  
c) Wire unit properly.  
b) Duct work improperly installed.  
c) Improper wiring between cen-  
tral furnace and Model 1303.  
5. Air from registers is not hot.  
6. Blower runs too long.  
a) Blower control is set too low.  
b) Bad blower control.  
a) Adjust blower control to  
higher setting.  
b) Replace blower control.  
a) Blower control cut-off set too  
low.  
a) Set blower control cut-off  
to higher setting.  
7. Blower does not run long  
enough.  
a) Blower control cur-off set too  
high.  
a) Set blower control cut-off to  
lower setting.  
b) Bad blower motor.  
b) Replace blower.  
8. Smoke and/or odor from  
registers when furnace is  
used for first time.  
Oil from furnace and duct work.  
The metal used in construction  
of the furnace and duct work has  
a light coating of oil. This should  
disappear after a short period of  
time. Once this burn-off has oc-  
curred, it should not reoccur.  
9. Creosote buildup.  
a) Burning green wood(not  
seasoned or dry).  
a) Burn only seasoned wood.  
b) Thermostat setting too low for  
type fuel.  
b) Set thermostat higher to at-  
tain higher flue temperatures.  
10. Flame spillage when feed  
door is open.  
a) Insufficient draft.  
b) Smothering fire when adding  
fresh fuel.  
a) Set thermostat higher.  
b) Add fuel so as not to  
smother fire.  
19  
 
APPENDIX  
INSTALLATION A  
TO EXISTING  
DUCT WORK  
COLD AIR  
RETURN  
WARM AIR  
EXISTING  
FURNACE  
FILTER BOX  
MODEL 1303  
FURNACE  
20  
 
INSTALLATION B  
PLENUM  
COLLECTOR BOX  
TO EXISTING  
DUCT WORK  
COLD AIR  
RETURN  
WARM AIR  
EXISTING  
FURNACE  
FILTER BOX  
MODEL 1303  
FURNACE  
INSTALLATION C  
PLENUM ELBOW  
TO EXISTING  
DUCT WORK  
COLD AIR  
RETURN  
WARM AIR  
PLENUM TOP  
(OPTIONAL)  
EXISTING  
FURNACE  
FILTER BOX  
MODEL 1303  
FURNACE  
21  
 
INSTALLATION D  
DUCT  
WORK  
2" MINIMUM  
CLEARANCE  
11 PCS  
(OPTIONAL PLENUM  
FAN CONTROL LOCATION)  
COLD AIR  
RETURN  
FURNACE PLENUM  
EXISTING FURNACE  
ANTI-BACKDRAFT  
FLAPPER  
SOLID FUEL  
FURNACE  
INSTALLATION E  
DUCT  
WORK  
2" MINIMUM  
CLEARANCE  
BAFFLE  
COLD AIR  
RETURN  
FURNACE PLENUM  
EXISTING FURNACE  
SOLID FUEL  
FURNACE  
22  
 
INSTALLATION F  
DUCT  
WORK  
2" MINIMUM  
CLEARANCE  
COLD AIR  
RETURN  
FURNACE PLENUM  
EXISTING FURNACE  
SOLID FUEL  
FURNACE  
INSTALLATION G  
DUCT  
WORK  
2" MINIMUM  
CLEARANCE  
CENTRAL  
FURNACE  
INSTALLATION  
COLD AIR  
RETURN TO  
FILTER BOX  
SOLID FUEL  
FURNACE  
23  
 
OWNERS MANUAL  
HOW TO ORDER REPAIR PARTS OR "OPTIONS"  
THIS MANUAL WILL HELP YOU TO OBTAIN EFFICIENT, DEPENDABLE  
SERVICEFROMTHEFURNACE, ANDENABLEYOUTOORDERREPAIR  
PARTS CORRECTLY.  
KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.  
WHEN WRITING, ALWAYS GIVE THE FULL MODEL NUMBER WHICH IS  
ON THE NAMEPLATE ATTACHED TO THE FRONT OF THE FURNACE.  
WHEN ORDERING REPAIR PARTS OR OPTIONS, ALWAYS GIVE THE  
FOLLOWING INFORMATION AS SHOWN IN THIS LIST:  
1. The PART NUMBER  
2. The PART DESCRIPTION  
3. The MODEL NUMBER: 1303  
4. The SERIAL NUMBER  
BEFORE INSTALLING YOUR HEATER, FILL IN THE SERIAL  
NUMBER IN THE SPACE PROVIDED ABOVE FOR YOUR  
RECORDS.  
UNITED STATES STOVE COMPANY  
227 Industrial Park Rd., P.O. Box 151  
S
C
South Pittsburg, TN 37380  
(423) 837-2100  
U S  
P
 

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