United States Stove Electric Heater 3500 User Manual

Models 3500, 3500PB & 3700, 3700PB  
OWNER'S MANUAL  
CAST IRON  
ROOM HEATER  
SAFETY NOTICE:  
If this solid fuel room heater is not properly installed, a house fire may result. For your safety  
and to reduce the risk of fire, follow the installation directions. Contact local building, fire  
officials, or the authority having jurisdiction about restrictions and installation inspection  
requirements in your area. Kindly save these instructions for future reference.  
VERY IMPORTANT  
PLEASE READ THIS ENTIRE MANUAL BEFORE YOU INSTALL AND USE YOUR NEW ROOM  
HEATER. FAILURE TO FOLLOW INSTRUCTIONS MAY RESULT IN PROPERTY DAMAGE,  
BODILYINJURY, OREVENDEATH. FAILURETOREADANDFOLLOWTHESEINSTRUCTIONS  
BEFORE YOU PROCEED MAY RESULT IN DAMAGE, VOIDING YOUR WARRANTY!  
HOT WHILE IN OPERATION. KEEP CHILDREN, CLOTHING, AND FURNITURE AWAY.  
CONTACT MAY CAUSE SKIN BURNS.  
UNITED STATES STOVE COMPANY  
227 Industrial Park Road  
P.O.Box 151  
A
South Pittsburg, TN 37380  
(423) 837-2100  
S
C
U
S
P
851796  
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Stove Safety  
IT IS YOUR OR THE INSTALLER’S RESPONSIBILITY TO READ ALL SAFETY PRECAUTIONS  
AND FOLLOW THE PRESCRIBED DIRECTIONS�  
When properly maintained and operated your stove should give you many years of service. How-  
ever there are important safety aspects of these products that you need to be aware of when oper-  
ating a wood stove.  
1. ONLY USE SOLID WOOD FUEL. NEVER USE GASOLINE, GASOLINE-TYPE LANTERN FUEL,  
KEROSENE, CHARCOAL LIGHTER FLUID, NAPHTHA, ENGINE OIL, OR SIMILAR LIQUIDS  
TO START OR ‘FRESHEN UP’ A FIRE IN THIS STOVE. KEEP ALL SUCH LIQUIDS WELL  
AWAY FROM THE STOVE WHILE IT IS IN USE. DO NOT BURN GARBAGE IN THE STOVE.  
2. The burning of wood gives off gases which can be extremely dangerous. The stove is designed  
that under normal operating circumstances these gases pass up the flue chimney system and  
cannot escape into your home, however it is important that your flue system is properly installed  
and that you check all joints regularly to ensure that there are no cracks or gaps, check the door  
sealing rope and replace when damaged. We recommend a smoke alarm be fitted in rooms  
where stoves are installed. Do not use stove in a room where negative pressure conditions may  
occur, such as through the use of extraction fans unless an adequate air supply into the room is  
ensured, as this may draw air through the stove and cause products of combustion to escape into  
the room.  
3. Creosote and soot may accumulate in your flue pipe and chimney. This may ignite, causing a  
chimney fire. If you suspect a chimney fire evacuate people from the building, close down the  
air controls on the stove and call the Fire Department. To prevent the accumulation of soot or  
creosote, check flue and chimney regularly and clean as necessary. Good burning, hot stoves  
will generally cause a lot less build-up than slow burning stoves. Likewise dry wood will cause  
less build-up than wet wood. We recommend a fire extinguisher be available where stoves are  
in operation. In the event of a chimney fire do not re-light the stove until it and the flue chimney  
system have been thoroughly checked and repaired as necessary.  
4. Stoves get extremely hot and should not be touched when lit. When young children are in the  
area, we recommend the use of a suitable fire guard around the stove. Always wear protective  
gloves when reloading stove.  
5. Never over-fire your stove. If external parts of your stove are glowing red then the stove is over-  
firing and your draft settings should be reduced. Never interfere with the draft mechanisms or  
adjust your air settings outside those limits set when the stove is manufactured. Never use a fan  
to supply air to the stove or to extract air from it.  
6. All users of the stove should be aware of the contents of this manual. Please leave this manual  
where it is accessible to stove users and do not allow anyone to use the stove that is unfamiliar  
with its correct operation.  
7. Never use the stove if any parts are missing or damaged, only use genuine parts as replace-  
ments. Never modify your stove.  
8. DO NOT INSTALL IN A MOBILE HOME.  
We hope you have many years of warmth and comfort from your stove  
but please do so safely�  
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Check Building Codes  
When installing, operating and maintaining your stove, follow the guidelines presented in these in-  
structions, and make them available to anyone using or servicing the stove.  
Your city, town, county or province may require a building permit to install a solid fuel burning appli-  
ance.  
In the U.S., the National Fire Protection Association’s Code, NFPA 211, Standards for Chimneys,  
Fireplaces, Vents and Solid Fuel Burning Appliances, or similar regulations, may apply to the in-  
stallation of a solid fuel burning appliance in your area. In Canada, the guideline is established by  
the CSA Standard, CAN/CSA-B365-M93, Installation Code for Solid-Fuel-Burning Appliances and  
Equipment.  
Before installing your stove  
Always consult your local building inspector or authority having jurisdiction to determine what regu-  
lations apply in your area.  
You need to consider the following to ensure the safe operation of your stove.  
• Provision of adequate air to support efficient combustion of the fuel.  
• A well sealed flue/chimney system, herein after referred to as the “flue system”.  
• The protection of combustible materials in proximity of the stove.  
Adequate Provision of Air  
It is essential for the safe and efficient use of your stove that you provide an adequate air supply to  
your stove. This may mean the provision of an outside air supply to the room, especially if there are  
extraction units such as cooker hoods or clothes dryers in the vicinity. Failure to do so will mean that  
fuel is burned inefficiently causing smoke and blackening the glass and may also cause smoke to  
come back into the room. As a simple check for this open a door or window in the room and check  
if the stove burns more efficiently.  
Specifications  
Overall  
Maximum  
Output  
Size  
Net  
Flue  
Size  
Model  
Efficiency  
H x W x D  
Weight  
(%)  
3500  
26⅝” x 20⅞” x 16½”  
6"  
37,000BTU or  
306 lb  
(139 kg)  
73  
72  
11KW  
3500PB  
3700  
675mm x 530mm x 420mm  
33⅜” x 27⅝” x 23”  
150mm  
6"  
63,000BTU or  
408 lb  
(185 kg)  
18.5KW  
3700PB  
860mm x 701mm x 583mm  
150mm  
FOR PURPOSES OF THE TAX CREDIT, BOTH OF THESE STOVES EXCEED THE 75% MAN-  
DATE, AS THE TEST CRITERIA WAS BASED SOLELY ON THE “LOWER HEAT VALUE,”  
RATHER THAN THE ABOVE SCALE. THIS MODEL MEETS ALL REQUIREMENTS FOR TAX  
CREDIT.  
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Installation  
Unpacking and preparing your stove for installation.  
1. Remove your stove from the outer packaging and place on floor. Please inspect stove and check  
that it is not damaged in any way. Never attempt to use a stove that has been damaged.  
2. If you are installing the stove yourself, proceed as follows. However, if you are unsure about any  
aspect of stove installation, please contact your dealer and he will discuss installation with you or  
put you in touch with an experienced stove installer.  
3. Open fire door. Remove and check the following contents.  
• 4 stove legs  
• Wooden handle and screws  
• Ash pan  
• Operating tool  
• Handle holder  
In the unlikely event that something is missing please contact your dealer immediately and we will  
rectify the situation.  
4. Gently lay the stove on its back. Remove screws from 4 corners of base and fit one of the legs to  
each corner of the stove. Tighten bolt to ensure leg is secure to base of stove. When complete,  
gently stand the stove upright.  
5. Move the stove into position. Do not drag the stove as this may damage the legs, screws or base.  
The Floor Protection  
If the stove is to be installed on a com-  
bustible floor, it must be placed on a non-  
combustible hearth pad. In the USA, the  
floor protector must extend 8” beyond  
each side of the flue loading door and 16”  
to the front. In Canada, the floor protec-  
tor must extend 8“ (200mm) beyond each  
side and the back of the appliance and  
18“ (450mm) to the front. (See fig. 4)  
In a rear vent installation the floor protec-  
tion must also extend under the stove-  
pipe a minimum of 2” (50mm) beyond  
either side of the pipe.  
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Installation Clearances  
It is extremely important that you respect required installation distances and that you respect local  
installation regulations. This is for your safety! The manufacturer is not responsible for the product,  
if it is not installed following these recommendations. These clearances may only be reduced by  
means approved by the regulatory authority.  
One necessary precautions when installing a wood stove is to leave sufficient space between the  
stove (top, sides, back, front, and under stove pipes) and any other material that can catch fire.  
A combustible surface is anything that can burn (i.e. sheet rock, wall paper, wood, fabrics etc.)  
These surfaces are not limited to those that are visible and also include materials that are behind  
non-combustible materials. If you are not sure of the combustible nature of a material, consult your  
local fire officials.  
3500, 3500PB  
3700, 3700PB  
Single Wall Connector Pipe Single Wall Connector Pipe  
A – Chimney Connector to backwall  
B – Chimney Connector to sidewall  
C – Chimney Connector to cornerwall  
D – Unit to backwall  
15.5” (394 mm)  
28” (711 mm)  
15” (381 mm)  
13” (330 mm)  
20” (508 mm)  
7” (178 mm)  
21.5” (546 mm)  
29” (737 mm)  
21.5” (546 mm)  
17” (432 mm)  
20” (508 mm)  
11.5” (292 mm)  
E – Unit to sidewall  
F – Unit to cornerwall  
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Installation Clearances  
Only materials and items approved for solid fuel stoves should be used for your stove. Under no  
circumstances should you use aluminum or galvanized steel pipes for your stove flue.  
Always fit pipes with the narrow side down, this allow any creosote to run down the inside of the  
pipe and not to come out and cause an unsightly mess and possible fire hazard. All joints in the flue  
system should be sealed with fire cement and/or an appropriate fire resistant rope or gasket.  
Pipe bends should be kept to a minimum and we do not recommend using more than 2 bends on  
any installation. Flues must not pass through ceilings, floors, attics, roofs, or combustible walls with-  
out adequate and approved insulation being provided to protect combustible materials.  
The chimney and flue provide a means of taking combusted fuel from the stove, as well as a draft to  
enable the stove to work. It is essential that the flue system is kept in good condition and there are  
no breaks or cracks allowing contact with any other combustible materials of the house. It is also  
essential that the flue system is kept clean and seals are maintained to ensure the draft is not lost.  
The open end of the flue system must be above the height of the apex of the building and any other  
obstructions, such as trees, which are within 3 meters (10ft) of the flue system. Failure to do this will  
affect the efficiency of the stove and may cause down drafts which will mean dangerous products of  
combustion are emitted into room.  
Under no circumstances should the flue pipe be less than 6” (125mm) internal diameter.  
Chimney Connection  
The chimney connector is a single walled pipe used to connect the stove to the chimney. For use  
with the appliance the chimney connector MUST be 6” in diameter, with a minimum thickness of 24  
gauge black steel or 26 gauge blued steel.  
Aluminum and galvanized steel pipe is not acceptable for use with the appliance. These materials  
cannot withstand the extreme temperatures of a wood fire and can give off toxic fumes when heated.  
Do not use the connector pipe as a chimney�  
Each chimney connector or stovepipe section must be installed to the stove flue collar and to each  
other with the male (crimped) end toward the stove. See fig 5.  
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This prevents any amount of condensed or liquid creosote from running down the outside of the  
pipe or the stove top. All joints, including the flue collar connection must be secured with three sheet  
metal screws to ensure that the sections do not separate.  
For the best performance the chimney connector should be as short and direct as possible, with no  
more than two 90° elbows. The maximum horizontal run is 36” and a recommended total length of  
stovepipe should not exceed 10 feet. Always slope horizontal runs upward ¼” per foot toward the  
chimney.  
No part of the chimney connector may pass through an attic or roof space, closet or other con-  
cealed space, or through a floor ceiling. All sections of the chimney connectors must be accessible  
for cleaning. Where passage through a wall or partition of combustible construction is desired, the  
installation must conform with NFPA 211 or CAN/CSA-B365, and is also addressed in this manual.  
Chimney  
DO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE SERVING ANOTHER APPLIANCE. DO  
NOT CONNECT TO ANY AIR DISTRIBUTION DUCT OR SYSTEM.  
This room heater must be connected to a 6” factory built UL 103 HT chimney (ULC S629, in Cana-  
da) or a code-approved masonry chimney with a flue liner.  
Chimney Height  
A masonry chimney or a listed factory-build chimney must be the required height above the roof and  
any other nearby obstructions. The chimney must be at least 3’ (90 cm) higher than the highest  
point where it passes through the roof and at least 2’ (60 cm) higher than the highest part of the roof  
or structure that is within 10’ (305 cm) of the chimney, measured horizontally.  
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Factory Built Chimney  
When a metal prefabricated chimney is used, the manufacturer’s installation instructions must be  
followed. You must also purchase (from the same manufacturer) and install the ceiling support  
package or wall pass-through and “T” section package, firestops (where needed), insulation shield,  
roof flashing, chimney cap, etc. Maintain proper clearance to the structure as recommended by the  
manufacturer. The chimney must be the required height above the roof or other obstructions for  
safety and proper draft operation.  
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Masonry Chimney  
Ensure that a masonry chimney meets the minimum standards of the National Fire Protection As-  
sociation (NFPA) by having it inspected by a professional. Make sure there are no cracks, loose  
mortar or other signs of deterioration and blockage. Have the chimney cleaned before the stove is  
installed and operated. When connecting the stove through a combustible wall to a masonry chim-  
ney, special methods are needed.  
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Combustible Wall Chimney Connector Pass-Throughs  
Method A� 12” (304.8 mm) Clearance to Combustible Wall Member:  
Using a minimum thickness 3.5” (89 mm) brick and a 5/8” (15.9 mm)  
minimum wall thickness clay liner, construct a wall pass-through.  
The clay liner must conform to ASTM C315 (Standard Specifica-  
tion for Clay Fire Linings) or its equivalent. Keep a minimum of  
12” (304.8 mm) of brick masonry between the clay liner and wall  
combustibles. The clay liner shall run from the brick masonry outer  
surface to the inner surface of the chimney flue liner but not past  
the inner surface. Firmly grout or cement the clay liner in place to  
the chimney flue liner.  
Method B� 9” (228.6 mm) Clearance to Combustible Wall Member:  
Using a 6” (152.4 mm) inside diameter, listed, factory-built Solid-  
Pak chimney section with insulation of 1” (25.4 mm) or more, build  
a wall pass-through with a minimum 9” (228.6 mm) air space be-  
tween the outer wall of the chimney length and wall combustibles.  
Use sheet metal supports fastened securely to wall surfaces on all  
sides, to maintain the 9” (228.6 mm) air space. When fastening  
supports to chimney length, do not penetrate the chimney liner (the  
inside wall of the Solid-Pak chimney). The inner end of the Solid-  
Pak chimney section shall be flush with the inside of the masonry  
chimney flue, and sealed with a non-water soluble refractory ce-  
ment. Use this cement to also seal to the brick masonry penetra-  
tion.  
Method C� 6” (152.4 mm) Clearance to Combustible Wall Member:  
Starting with a minimum 24 gage (.024” [.61 mm]) 6” (152.4 mm)  
metal chimney connector, and a minimum 24 gage ventilated wall  
thimble which has two air channels of 1” (25.4 mm) each, construct  
a wall pass-through. There shall be a minimum 6” (152.4) mm sep-  
aration area containing fiberglass insulation, from the outer surface  
of the wall thimble to wall combustibles. Support the wall thimble,  
and cover its opening with a 24-gage minimum sheet metal sup-  
port. Maintain the 6” (152.4 mm) space. There should also be a  
support sized to fit and hold the metal chimney connector. See that  
the supports are fastened securely to wall surfaces on all sides.  
Make sure fasteners used to secure the metal chimney connector  
do not penetrate chimney flue liner.  
Method D� 2” (50.8 mm) Clearance to Combustible Wall Mem-  
ber: Start with a solid-pak listed factory built chimney section at  
least 12” (304 mm) long, with insulation of 1” (25.4 mm) or more,  
and an inside diameter of 8” (2 inches [51 mm] larger than the 6”  
[152.4 mm] chimney connector). Use this as a pass-through for  
a minimum 24-gauge single wall steel chimney connector. Keep  
solid-pak section concentric with and spaced 1” (25.4 mm) off the  
chimney connector by way of sheet metal support plates at both  
ends of chimney section. Cover opening with and support chimney  
section on both sides with 24 gage minimum sheet metal supports.  
See that the supports are fastened securely to wall surfaces on all  
sides. Make sure fasteners used to secure chimney flue line.  
NOTES:  
1. Connectors to a masonry chimney, excepting method B, shall extend in one continuous section through the wall  
pass-through system and the chimney wall, to but not past the inner flue liner face.  
2. A chimney connector shall not pass through an attic or roof space, closet or similar concealed space, or a floor, or  
ceiling.  
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Operating Your Stove  
Do not use a grate, andiron or other fuel support method. Build fire directly on the hearth.  
Only open door to fuel/refuel the stove. Excess air can cause the stove to over fire. Do not over  
fire, if chimney or stove is glowing red you are over firing.  
Do not build the fire too close to the glass. Do not abuse the glass doors. Do not strike or slam  
shut the door.  
DO NOT USE CHEMICALS OR FLUIDS TO START THE FIRE.  
Fuel  
Your stove is designed to burn solid wood fuel only; it is not designed to burn,  
• Paper or cardboard, other than small amounts used to light stove.  
• Treated or painted wood  
• Synthetic fuel or logs that are not approved for solid fuel stoves  
• Household rubbish  
• Liquid fuels  
• Plastics  
Burning these or other products for which the stove was not designed may damage the stove and  
cause a fire hazard or release toxic fumes  
Fuel should be stored in a dry place; wood should be dried for at least 1 year. Do not store fuel within  
the installation clearances or within the space required for charging and ash removal. Wet wood  
may cause serious creosote, which may damage your flue system and even your stove. Therefore  
the use of wet wood is strongly discouraged.  
First operation of stove  
You should begin using your stove by lighting small fires which get progressively bigger. We recom-  
mend a series of about five small fires before you put the stove into full service. Allow the stove to  
fully cool between each of these fires. There may be some smell and a small amount of smoke from  
the stove during the initial operations. This is perfectly normal and is merely the curing of the stove  
paint. Opening a window or door to provide additional ventilation will help alleviate this.  
Air controls  
Your stove needs air to burn the fuel. This air is supplied through the spin valve at the base of the  
door and through the slots over the glass.  
Primary air, as the name suggests, is used for the initial burning of the fuel. Secondary air is used  
for secondary combustion, which makes the stove more efficient, reduces the emissions and is also  
used to keep the stove glass clean. Wood burns better with the air over the fire bed and when burn-  
ing a lot of wood, you should use the secondary air supply more.  
The settings of both of these air controls very much depends on draft and local conditions and after  
a few fires, you should have a good idea of the best settings for your stove. The air controls should  
be fully opened when lighting the fire. Once the fire is established, the controls may be adjusted as  
required. Reducing the air intake will cause the stove to burn slower. This may cause some blacken-  
ing of the stove glass, but this should burn off once the stove is burning brightly again.  
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Refueling  
Before refueling your stove, turn the air supply to high for a few moments until there is a good fire  
in the stove. This will ensure there is no build-up of harmful gases in the stove when the door is  
opened and will also get the new fuel burning quickly and not allow it to kill the fire.  
To reload the stove, open the door and feed the fuel in slowly using tongs or a small shovel. Do not  
overfill the stove. It is always better to put in small loads often rather than big fills less frequently.  
Close the door gently after stove is reloaded.  
You should always wear protective gloves and use tongs when tending a hot stove.  
Ash Removal  
Your stove is fitted with a shaker grate to remove the ash from the firebox. Use the operating tool to  
move the shaker knob forward and back. This will allow the ash to fall into the ash pan under the fire  
bed. This can also be achieved by using a poker.  
When ash has built up in the ash pan, it should be emptied. Failure to do this will cause ash to build  
up around the grate and may cause your grate to warp or burn out. It is especially important when  
burning fuel with high ash content that you keep your grate clear and your ash pan emptied regu-  
larly, so as not to damage your grate. Clear the grate with the shaker bar or a poker regularly.  
To remove the ash, open the stove door and use the operating tool provided to lift the ash pan out  
of the stove. If possible, this should be done before lighting the stove when the ash is cold. Even if  
the ash appears to be cold, it should be placed in a non-combustible container as there may be hot  
ash in the center of the pile. You should always were protective gloves when removing ash from the  
stove.  
This stove is not designed to operate with the door open. Always close the stove door when you  
have taken out the ash tray and leave closed while disposing of the ash. Only reopen to put ash pan  
back into the stove and close immediately afterwards.  
Ashes should be placed in a metal container with a tight fitting lid. The closed container of ashes  
should be placed on a noncombustible floor or on the ground, well away from all combustible ma-  
terials, pending final disposal. If the ashes are disposed of by burial in soil or otherwise locally dis-  
persed, they should be retained in the closed container until all cinders have thoroughly cooled. Do  
not place any other waste in the container.  
Overnight Burning  
Your stove is designed to allow overnight burning. To do this, put a good fuel bed into the stove and  
allow it to burn for about 15 minutes so as not to kill the fire. Then close the secondary air supply at  
the top of the door and turn the primary air inlet to almost closed. The exact setting of this depends  
on local conditions, but we suggest you begin with about a ½ turn open. If the fire burns away, then  
next time close it a little more. If the fire goes out, you need to try with it a little more open. After a  
couple of nights, you will find the setting that best suits the local conditions of your stove.  
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When you return to your stove, fully open both air controls until you have a good fire and then set  
to normal operating levels. Do not add fuel until the fire bed is hot and red. Then add a little for the  
first time and allow that to ignite before adding more. During overnight burning, the stove glass will  
blacken, but when a hot fire is established again this should burn off.  
Stove Maintenance  
CHECK STOVE REGULARLY  
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. 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. The chim-  
ney and chimney connector should be inspected at least once every two months during the heating  
season to determine if a creosote buildup has occurred. If creosote has accumulated, it should be  
removed to reduce the risk of a chimney fire.  
Initially, we recommend you check your flue system at least once per month. After the first few  
months you will notice a pattern of soot and creosote build up and you can then determine an in-  
spection interval for checking soot and creosote build up that is suitable for your stove installation.  
Other checks, as listed below, should be carried out at least twice per year. If you notice anything  
wrong at any time it should be repaired immediately. Never use a stove that is in any way damaged  
or has a damaged flue.  
1. Check your flue system for build up of soot or creosote and for signs of damage to joints. To check  
flue outlet remove top of baffle by lifting and pulling out at end. Use a flashlight to check flue out-  
let. Clean and repair as necessary. Always replace top baffle before relighting stove.  
2. Check that glass is not cracked or chipped and that sealing rope is in good condition. Replace as  
necessary.  
3. When the room is dark, use a strong flashlight to check the sealing of the stove at the edge and  
corners for leaks. Any leaks or cracks found should be repaired with fire cement or damaged  
parts should be replaced with genuine spare parts.  
4. Check that stove door is tight and well sealed when closed. Place a strip of paper into the stove  
and close the door, try to pull out paper. You should feel some resistance to your pull, check  
several points around the door. If it pulls out too easily, replace the rope and seal in place with a  
suitable high temperature sealant.  
Care of Glass  
At times, especially when the air controls are turned to low settings or when damp wood is used, the  
stove glass will blacken. This is caused by fuel that is not completely burnt, but the build-up on the  
inside of the glass will normally burn off when a good hot fire is established in the stove.  
There may be times however when you need to clean the glass. To do this, use a soft cloth and a  
non-abrasive glass cleaner. Only ever clean the glass when the stove is cold. When loading fuel  
into the stove, always make sure it is not protruding out through the door opening, as this may break  
the glass when you close the door. This is especially relevant when loading logs. Always close the  
door gently.  
Do not operate with broken or cracked glass. If the glass does crack when the stove is lit, let the fire  
die out. Do not open the door until the stove has fully cooled. Replace the glass only with the speci-  
fied replacement part before re-using the stove.  
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Replacement of Glass  
1. Remove the door from the stove and place on a flat surface.  
2. Carefully remove all of the glass clips from the inside of the door.  
3. Gently remove the glass panel and gasket.  
4. Using a wire brush, remove all remaining debris from the glass area.  
5. Apply a small bead of gasket/stove cement and the new gasket. Do not overlap the ends of the  
gasket rope.  
6. Center the new glass panel over the gasket and reinstall the glass clips.  
7. It may be necessary to retighten the glass clips after the stove has be burned and the gasket has  
been seated.  
Important:  
1. It is extremely important to tighten the glass clips slowly and in an alternating pattern.  
2. Always wear protective gloves when you handle glass with sharp edges.  
Replacing parts  
Always use genuine replacement parts. Only ever make replacements when the stove is cold.  
Surface Finish  
The stove should only be cleaned using a damp cloth. Some cleaning products may leave stains on  
the stove surface. Never use abrasive cloths as these may scratch the surface. Painted stoves can  
be re-painted by using a good quality, high temperature stove paint. When re-painting, make sure  
there is plenty of ventilation and follow the manufacturer’s instructions. Allow the paint to fully dry  
before lighting the stove and allow extra ventilation for the first couple of fires as some fumes may  
emit from the stove as the paint cures.  
Trouble Shooting  
Fire Not Burning  
A stove not burning is generally caused by either a shortage of air and/or incorrect or damp fuel. If  
fuel is not the problem check:  
• That the air controls are opened.  
• There is no blockage in the flue system.  
• That the open end of the flue is above the height of any nearby obstructions.  
• That there is a sufficient air supply into the room and that this supply is not being taken by an  
extractor fan.  
Glass Blackens  
Glass usually blackens when:  
• The fuel is not being burned efficiently because of starvation of air.  
• Bad quality or damp fuel is being used.  
• Balance between primary and secondary air is incorrect.  
Try to introduce more air into the stove, especially through the secondary air control on the top of the  
stove door as this air flows down over the glass to help burn off the creosote. For optimum efficiency  
always use a good quality wood.  
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Smoke in Room  
If the stove is properly installed it should not emit any smoke into your room. Should this happen,  
Check that your room is not air tight. This can easily be checked by opening a door or window. If the  
smoking stops you need to provide an additional air supply into the room. If this is not the problem,  
check if your chimney is blocked or obstructed and that you are not getting a down draft caused by  
the location of the open end of the flue pipe or chimney.  
If the problem persists contact your dealer and ask him to get your chimney and stove installation  
checked.  
Fire Burns too Quickly  
This is usually caused by too much draft or air.  
• Firstly try reducing the air supply to the stove by closing down your air controls, if this fails then  
you may have damage to the sealing.  
• Check the condition of the door sealing rope and the joints within the stove.  
If neither of these solve the problem you may have too much draft on your chimney and you may  
need to fit a damper valve into your flue system. You should not install a flue damper without con-  
sulting a specialist. Never install a damper that can completely block your flue or chimney. Contact  
your dealer to discuss this.  
Fire Burns too Quickly  
Chimney fires occur when soot and creosote that have built up in the flue system ignite. If the stove  
is operated properly and the flue checked and cleaned regularly then chimney fires should not oc-  
cur. These fires can be very dangerous and must be avoided. Try to maintain good, hot fires in the  
stove whenever possible and at least once in every firing open the air controls and allow the stove to  
burn on full for a short while until the entire fire bed is glowing red. Check your flue system regularly  
for build-up of soot and creosote and clean as necessary.  
Chimney fires can be detected by sparks coming from the top of the chimney, a roaring sound com-  
ing from the area of the stove or chimney or vibration in the stove or chimney.  
In the event of a chimney fire, close the air controls, evacuate the building and call the fire depart-  
ment. Do not relight the stove after a chimney fire until the stove and flue have been checked and  
any necessary repairs have been carried out.  
16  
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Warranty Policy & Procedures  
U.S. Stove offers the original retail purchaser of the Solid Fuel burning products a limited 5-year warranty.  
The following outlines the U. S. Stove's Warranty programs.  
U. S. Stove Limited Warranty  
This warranty applies to the original retail purchaser only. U. S. Stove warrants that this stove will be free of defects in  
material and workmanship for a period of five years from the date of purchase. U. S. Stove will repair or replace (parts  
and labor) at its option, any stove or part thereof found to be defective.  
Warranty Defined  
Description  
Parts  
5 Years  
5 Years  
5 Years  
5 Years  
1 year  
Labor  
1 year  
Firebox (welding only )  
Handle assembly  
Not Included  
1 year  
Ash pan  
Cast iron parts  
1 year  
Ceramic glass (thermal breakage only )  
Paint, fire bricks  
Not Included  
Not Included  
1 year  
You must arrange to deliver or ship the stove or part to an authorized U. S. Stove dealer at your own expense and ar-  
range for pickup or delivery of the same after the repairs have been made. If, upon inspection, any damage is found  
to be the fault of the manufacturer, the repair or replacement will be made. This warranty does not include expenses  
incurred from travel time or loss of service. This warranty is not transferable and is extended only to, and is solely for the  
benefit of, the original retail purchaser of the stove. Please keep your dated sales receipt as proof of purchase.  
Exclusions and Limitations  
This warranty does not cover the following:  
1. Repair or replacement of parts, which are subject to normal wear and tear during the warranty period or to parts that  
may require replacement in connection with normal maintenance. These parts include paint, gaskets, burn plates,  
baffles, fire grates or glass (glass is only warranted against thermal breakage).  
2. Damage due to incorrect installations not in conformance with the manufacturer’s installation instructions or local and  
national regulations. It is the responsibility of the installer to ensure that the unit is installed and operating correctly  
at the time of installation.  
3. Damage caused by over-firing, which causes any part of the appliance to glow red, as defined in the operation  
manual. Over-firing can be identified by warped plates, rust colored cast iron, paint pigment that has turned dusty  
white, or bubbling, cracking and discoloration of the enamel finish.  
4. Damage caused by unauthorized modification, use, or repair.  
5. Damage made while the stove is in transit.  
6. Products for which the manufacturer provides a specific warranty.  
7. Travel time or any other expenses are not covered under warranty.  
8. At no time will U. S. Stove be liable for any consequential damage which exceeds the purchase price of the unit. All  
warranties, implied warranties of merchantability or other, are limited in duration to the length of this written warranty.  
No other warranty, including oral, is enforceable.  
NOTICE - This warranty is void if installation or service is performed by someone other than a qualified installer, service  
agency or if installation is not in conformity with installation instructions or local fire and building regulations. All warranty  
claims must be submitted through the authorized U. S. Stove dealer from whom the product was originally purchased.  
You may have other rights and obligations which vary from State to State. If you have a problem which proves difficult to  
resolve, feel free to contact United States Stove Company at 800.750.2723 and ask for Customer Service – Technical.  
17  
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3500, 3500PB Parts Diagram & List  
1
11  
2 3 4  
5
6
7
17  
18  
19  
20  
25  
24  
21  
8
9 10  
12 13 14 15  
22  
23  
38  
37  
36  
26  
27  
16  
39  
41  
32  
33  
28  
29  
34  
30  
35  
31  
40  
KEY PART # DESCRIPTION  
QTY.  
1
KEY PART # DESCRIPTION  
QTY.  
1
1
2
40517 Hob (HF517U-1)  
40518 Top Frame Casting (HF517U-2)  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
891695 Slide Plate Holding Frame (HF517U-22)  
891696 Slide Plate (HF517U-23)  
891697 Glass Holding Frame (HF517U-24)  
891698 Glass (HF517U-25)  
1
1
3
40519 Secondary Air Deflector Plate (HF517U-3)  
891689 Small Cover Plate (HF517U-4)  
40520 Top Baffle (HF517U-5)  
1
4
4
1
1
5
1
40532 Grate (HF517U-26)  
1
6
40521 Front (HF517U-6)  
1
40533 Grate Frame (HF517U-27)  
40534 Base (HF517U-28)  
1
7
40522 Left/Right Hand Side (HF517U-7)  
40523 Back Cover, Fire Fence (HF517U-8)  
40524 Fire Fence (HF517U-9)  
2
1
8
1
40535 Ashtray (HF517U-29)  
1
9
1
40536 Leg (HF517U-30)  
4
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
40525 Slid Knob (HF517U-10)  
1
40537 Operating Tool (HF517U-31)  
891699 Ashpan (HF517U-32)  
1
891690 Secondary Air Cover Plate (HF517U-11)  
40526 Fire Door (HF517U-12)  
1
1
1
891701 Handle Pays (HF517U-33)  
40538 Ash Door (HF517U-34)  
1
891691 Door Handle Rod (HF517U-13)  
891692 Door Handle (HF517U-14)  
40527 Spin Valve (HF517U-15)  
1
1
1
891708 Operating Rod (HF517U-35)  
891709 Left Side Firebrick (HF517U-36)  
891711 Right Side Firebrick (HF517U-37)  
891712 Back Side Firebrick (HF517U-38)  
891713 Bottom Side Firebrick (HF517U-39)  
891714 Heat Insulation Plate (HF517U-40)  
891715 Sealing Tape (HF517U-41)  
1
1
1
891693 Door Latch Plate (HF517U-16)  
891694 Back Plate, Ornamental (HF517U-17)  
40528 Back Cover (HF517U-18)  
1
1
1
1
1
1
40529 Cover, Back Air Inlet (HF517U-19)  
40530 Lock-tight Piece (HF517U-20)  
40531 Back (HF517U-21)  
1
1
1
1
1
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3700, 3700PB Parts Diagram & List  
2
1
3
3
5
5
6
6
2
7
7
8
41  
46  
8
10  
10  
40  
45  
4
4
14  
13  
38  
43  
39  
44  
11  
12  
12  
13  
9
9
25  
28  
22  
25  
43  
37  
42  
48  
36  
42  
47  
35  
40  
14  
15  
16  
15 16  
27 26  
32  
33 34  
38  
39  
17  
18  
31 32  
36 37  
20  
21  
18  
19  
30  
35  
23  
24  
27  
19  
20  
26  
29  
21  
22  
34  
28  
33  
KEY PART # DESCRIPTION  
QTY.  
1
KEY PART # DESCRIPTION  
QTY.  
1
2
40539 Hob (HF717U-1)  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
891726 Door Handle (HF717U-26)  
891727 Door Catch (HF717U-27)  
40552 Fire Door (HF717U-28)  
1
1
1
2
1
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
40540 Top Frame Casting (HF717U-2)  
891716 Sealing Tape (HF717U-3)  
891717 Slide Plate (HF717U-4)  
891718 Slide Plate Holding Frame (HF717U-5)  
40541 Back Slide Plate (HF717U-6)  
40542 Front (HF717U-7)  
1
3
1
4
1
40553 Fire Fence Bracket (HF717U-31)  
5
1
40554 Door Catch Sealing Plate (HF717U-32)  
40555 Leg (HF717U-33)  
6
1
7
1
40556 Base (HF717U-34)  
8
40543 Fire Fence (HF717U-8)  
891719 Door Hinge (HF717U-9)  
40544 Left Hand Side (HF717U-10)  
891720 Glass Holding Frame (HF717U-12)  
891721 Glass (HF717U-13)  
1
891728 Left Side Firebrick (HF717U-35)  
891729 Right Side Firebrick (HF717U-36)  
891730 Back Side Firebrick (HF717U-37)  
891731 Bottom Side Firebrick (HF717U-38)  
891732 Front Side Firebrick (HF717U-39)  
40557 Right Hand Side (HF717U-40)  
891733 SecondaryAir Deflector Plate (HF717U-41)  
40558 SecondaryAir Deflector Plate (HF717U-42)  
40559 Flue Blanking Plate (HF717U-43)  
891734 Boiler (HF717U-44)  
9
1
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
1
4
1
40546 Slide Knob (HF717U-14)  
40547 Grate Frame (HF717U-15))  
40548 Grate (HF717U-16)  
1
1
1
891722 Door Handle Rod (HF717U-17)  
891723 Ashpan (HF717U-18)  
1
1
40549 Spin Valve (HF717U-19)  
40550 Operating Tool (HF717U-20)  
40551 Ash Door (HF717U-21)  
891724 Handle Pays (HF717U-22)  
891725 Door Latch Plate (HF717U-25)  
1
891735 Back Ornamental Plate (HF717U-45)  
40560 Hob Blanking Plate (HF717U-46)  
891736 Short Tube (HF717-47)  
1
1
891737 Separate Hot Fiber (HF717U-48)  
1
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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  
INFORMATION AS SHOWN IN THIS LIST:  
1. THE PART NUMBER  
2. THE PART DESCRIPTION  
3. THE MODEL NUMBER: 3500  
3500PB  
3700  
3700PB  
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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