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Wood & Coal Burning Furnace
Owners Manual
Models: 24A, 30A
TESTED TO UL 391
USSC
All installations must be made in accordance with local and state codes which may differ from this manual.
UNITED STATES STOVE COMPANY
227 Industrial Park Road
P.O. Box 151
South Pittsburg, TN 37380
CHIMNEY INSTALLATION
Your new furnace must be installed into a "Class A" Chimney
only. This type of chimney consists of a flue lined brick chimney, or an approved "Class A" all fuel factory built (prefabricated) type. Any other installation guarantees an immediate fire hazard.
Do not install the furnace into the same chimney serving other appliances.
When using 8" flue pipe, the chimney should have an 8" to 10" round flue liner or 9"x9" square liner.
The chimney should have a minimum height of 3' from the top of the chimney to the point at which it passes through the roof.
The top of the chimney must be at least 2' higher than the peak or the highest portion of the roof within 10' horizontally.
A chimney that rises within the house is better insulated than a chimney that is located outside the house and exposed to the weather, the north side of the house is the worst position.
Check manual for proper installation of flue pipe into chimney.
FURNACE INSTALLATION
Install your furnace as close to the chimney as possible with a minimum of elbows, no more than two and a flue pipe run of no more than 6 feet horizontally. Also, the flue pipe should contain a 1/2" rise per foot and NEVER be installed closer than 18" from combustibles.
WOOD BURNING: Install a manual flue pipe draft damper at a safe, convenient location between your furnace and chimney.
COAL BURNING: Install a barometric damper set at .05 Water
Column.
AIR FLOW: Solid Fuel furnaces produce much hotter air than oil or gas fired appliances so all clearances are mandatory.
AIR DUCT INSTALLATION: This furnace provides a 12" round (113 sq. in.) opening, because of efficiency and general convenience.
United States Stove Company recommends a Parallel Furnace
Installation with direct (ducted) feed or return air to your furnace. NOTE: Cold air duct intake must be at least 25% larger than hot air duct outlet.
FURNACE ASSEMBLY
U.S. Stove provides easy step by step pictures, therefore, the furnace assembly procedure should be understandable.
FIRING YOUR FURNACE
Start on a conservative basis. Your new furnace, when properly fired with hard dry wood will achieve approximately 6 to 8 hours of burn time per load of wood, much longer with coal. If the furnace is being fired hot constantly with full flames and only provides a 3 hour burn cycle, the furnace is being overfired.
Possibly your heating requirements are too much for the size of furnace purchased. Certainly allowing your existing furnace to assist in extremely cold weather is no crime. Remember, your furnace can be damaged if fired continually at extremely high temperatures and this procedure will void your warranty.
CAUTION: OVERFIRING YOUR
FURNACE VOIDS WARRANTY.
Page 2
OVER FIRING
This generally occurs when the following procedures are not followed, ash door is open (even partially open), the feed door pressure relief flap is open, the feed door is open or the manual draft spinner is open. Open the ash and feed doors only when in attendance, never leave the furnace unattended when doors are open. This furnace has an automatic draft fan so use the manual draft with a specific purpose. Also, an overfilled ash drawer can cause grate warpage, keep ash drawer clean. Don't use furnace if distribution fan isn't functioning properly, and keep air filter clean. Draft fan opening should be set at 1/2" open as a point of start, depending on condition of fuel.
U. S. Stove recommends a very active fire at all times for maximum results, but only as instructed.
SOME HELPFUL HINTS
•Your furnace will hold logs approximately 2" shorter than the length of the firebox. Don't force in oversized logs.
•Unsplit, dry logs will provide longer burn time than split logs.
•Don't ever try to burn trash or garbage.
•Keep flue pipe stack temperature between 300 and 400 degrees. This will reduce creosote build-up. A magnetic surface thermometer can be obtained from your dealer.
•Weather is the most important determinant in how you operate your furnace (assuming you have dry wood).
•The colder it is the stronger the draft, warm weather reduces draft. Set your draft fan rheostat and manual draft accordingly.
•Open manual smoke damper only when starting the fire and when chimney draft is marginal.
•Always place logs so air can flow between them.
•Shake gently (up to 10 o'clock down to 8 o'clock) don't try to loose weight shaking down ashes!
•Wood ash is useful as a fertilizer because it contains potassium, ashes also decrease the acidity of the soil. Coal ashes will provide good traction on ice or snow, otherwise they are useless.
•Always store ashes in a metal container with a lid.
•Ashes are a good thermal insulator and will keep enough oxygen away so embers will not burn out.
•Never, never let ashes accumulate up to grate level, this will greatly reduce the life span of your grate.
•Coal produces much more ash than wood.
•Keep your chimney and flue pipe clean, check monthly.
•Smoke detectors and fire extinguishers should always be a part of your equipment.
•Never use chemicals or fluids such as gasoline, charcoal lighter, drain oil or kerosene to light a fire.
•Oil the air fan motors yearly. They do not contain bearings, sleeves with felt. Therefore keeping fan air clean is more important than oiling.
•Turn on your regular furnace once every month to keep it tuned up.
•Always shut the furnace down gradually to prevent excessive stress on steel.
WARPAGE OF STEEL IS COMMON, AGGRESSIVE BUT GENTLE FIR-
ING CAN MINIMIZE WARPAGE.
•There is no substitute for dry hard wood. Wood requires 6 months to a year to air dry to 25% moisture content or less.
•Don't throw heavy, wet wood into your Jensen, it could crack the firebox and bricks.
•Treat your furnace with the proper respect and it will reward you with much comfort, and a lifetime of central heat.
USSC
...to the world of solid fuel heating! Your new furnace has been designed and built with a high grade of materials and the strictest regard to quality.
Before you start installing your new furnace, take the time to read these installation and operating instructions. We have prepared them for your benefit to save time and provide some helpful knowledge on wood and coal burning.
Save the instructions for future use. It won't take long for you to realize the benefit of solid fuel heating, however, maintenance is the key to a long lasting relationship with your new furnace. These instructions can help you now as well as in the future.
Note: This owners manual is provided for Forced Air add on furnaces. United
States Stove Company is constantly developing and improving its product line, therefore, we reserve the right to change specifications without notice.
T ABLE OF CONTENTS
General Rules ............................................................................................................................................................ 4
How It Works .............................................................................................................................................................. 5
Installation Instructions ........................................................................................................................................... 6-9
Assembly ............................................................................................................................................................. 10-14
Control Box and Electrical Components ............................................................................................................. 15
Operation ........................................................................................................................................................... 15-19
Accessories .............................................................................................................................................................. 19
Trouble Shooting ..................................................................................................................................................... 20
Parts List & Diagram ........................................................................................................................................... 21-22
Wiring Schematic .................................................................................................................................................... 23
How To Order Repair Parts ..................................................................................................................................... 24
USSC Page 3
Rules for the Safe Installation and Operation of Your
Furnace...
Check local codes, the installation must comply with strict conformance in regard to clearances.
The furnace is designed to burn air dried wood and coal at a predetermined firing rate. Over firing could result in damage to the heat exchanger and cause dangerous operation. Over firing occurs when the ash door is left open during operation or a highly volatile fuel, such as large amounts of small kindling, is used. Note: This action voids all warranty.
The Furnace must be installed on a noncombustible floor.
Connect the furnace to tile lined inside masonry chimney or approved insulated all fuel prefabricated chimney only.
Follow a regular service and maintenance schedule of the furnace and chimney for efficient and safe operation.
Keep smoke pipe connection as short as possible, using a minimum 24 gauge pipe with a minimum 1/2" per foot rise from the flue collar to the chimney opening.
Do not leave the ash door open when the fire is burning.
Do not let ashes build up closer than 2" to the grate.
Be sure there is a sufficient supply of combustion air to the area where the furnace is to be located.
Do not over draft the furnace! It is designed to operate at .04 to .06 inches of water column and must be set with a draft gauge to maintain a steady draft.
With new steel, there is a small amount of oil or dirt on the metal. You may smell an odor. This is normal during the first operation. You should assemble the furnace out of doors and build a small fire in it to
"burn off" this dirt and oil before installing the unit.
Do not use flammable liquids for starting a fire.
During the first few fires, heat may slightly warp the front and back panels. This is normal and will not hamper your unit's operation.
Do not store fuel or combustibles near the furnace.
Some areas of the furnace are hot and could cause an explosion and possible bodily or property damage.
DO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE
SERVING ANOTHER APPLIANCE.
Store all ashes in a metal container with a tight sealing lid and allow ashes to cool before disposing of them, possibly a week.
BURN WOOD OR COAL ONLY THESE MODELS. DO NOT
MIX OTHER THAN THE USE OF WOOD TO START A COAL
FIRE.
Familiarize yourself with the furnace's solid fuel burning characteristics before leaving unit unattended for long periods of time.
DANGER - Risk of Fire or Explosion: Do not burn garbage, gasoline, drain oil or other flammable liquids.
The loading door and ash door must be tightly closed during furnace operation to insure safety and efficiency.
CAUTION -
The furnace has hot surfaces. Keep Children Away.
Do not touch during operation.
In the event of a chimney fire call the fire department, then be sure the furnace doors are closed tightly and the power to the unit is turned off.
WARNING - Risk of Fire:
Do not operate with flue draft exceeding 6 inches water column.
Do not operate with fuel loading or ash removal doors open.
Do not store fuel or other combustible material within marked installation clearances.
Inspect and clean flues and chimney regularly.
In case of a power failure, remove the filter from the cold air return box if equipped. Do not expect to keep your home at normal temperatures. Do not load fuel above the botom of the feed door.
This Furnace Must Be Installed By A Qualified Installer.
Page 4 USSC
HOW ...
How Your New Furnace Works
Unlike conventional heating (gas, oil, electric), wood or coal heating requires more user attention. Your furnace, with its automatic combustion air blower, alleviates the constant need for adjusting the burning rate common to other units on the market. The fire, however, must be started and subsequent fuel added by the user.
Conventional heating system produce heat only when the thermostat calls for heat. This way of heating is inefficient and often leaves part of the home either too hot or too cold. Your furnace is designed to deliver heat as long as there is a fire in it. The fire intensity is regulated by the room thermostat, high or low, the fire continues to produce heat. This heat is continuously distributed throughout the home by a distribution blower. This constant supply of heat is uniform and prevents drafts.
WARNING
Note: Improper firing. Wood or coal over firing occurs when the ash door is left open during operation or a highly volatile fuel is used.
Coal that exceeds the fire brick line will cause overfiring...this type of operation will immediately void any warranty.
USSC Page 5
Furnace location
Before you start!
It is very important you check with your dealer, local fire department, or building inspector. They will be able to inform you of any state or local codes pertaining to the location and installation of your furnace.
The ideal location for your furnace is centrally located in the basement. This allows for an even heat distribution by having all the duct work approximately the same length. Ideal locations cannot always be used for one reason or another, therefore, let's look at some alternatives.
If your home does not have a basement, but a utility room or garage, make sure there is enough space to maintain the required clearances stated on the label located on the furnace. Also, read about combustion air.
Chimney location is also critical. The furnace must be placed as close as possible to the chimney. You want the chimney connector (smoke pipe) to have a minimum of elbows, two (2) or less. Also, the chimney connector should not have to run more than six
(6) feet to the chimney.
CAUTION: The warm-air supply outlet of the Furnace should not be connected to the cold-air return inlet of the central furnace because a possibility exists of components of the central furnace overheating and causing the central furnace to operate other than as
intended.
After installation, be sure the measured external static pressure of the central and Furnace is not greater than those marked on the nameplates.
INSTALLATION #1
With this installation, a back draft damper (optional) is inserted into the heat run before the plenum of the existing furnace to prevent air from the existing furnace to blow back into the furnace when it is not in use. When a back damper is employed, it should be located as close to the existing furnace plenum as practical.
INSTALLATION #2
Extending the hot air duct from the furnace into the existing plenum will help direct the flow of air from the furnace as well as the flow in the existing furnace.
Ducting entering the existing plenum at an angle (approximately 45 degrees) will facilitate air flow from the furnace while diverting air from the existing furnace.
Page 6
INSTALLATION #3
The baffle on this system should be made the full width of the furnace plenum in order to properly direct the air into the distribution ducts.
USSC
Your furnace is designed to be added on to existing duct work and operate either with or without another heat source such as a gas furnace. The following diagrams illustrate acceptable ways of ducting your furnace.
Clearance to Combustible Materials
Your Furnace has been tested to determine the SAFE clearances to combustible material. The clearances are printed on the label located on the back of the furnace. The chart on this page also states these minimum clearances. Make sure you follow these when choosing your furnace location.
Any hot air plenum connection to a furnace must be constructed of metal.
NOTE: INSTALL ONLY ON A NON-COMBUSTIBLE FLOOR.
Clearance to Combustibles
Furnace to back wall
Furnace to side wall
Pipe to back wall
Pipe to side wall
Furnace to ceiling
Ductwork to ceiling
30"
12"
18"
18"
30"
18-6-1"
USSC Page 7
FLUE RECOMMEND A
Page 8
CAUTION!
Only a "Class A", all-fuel chimney intended for use with solid fuel should be used.
"Class A" chimneys are those made from tile-lined masonry (brick or block) or an independent laboratory approved allfuel factory-built chimney.
WHAT SIZE CHIMNEY SHOULD BE
USED?
The Chimney size to use is either six (6) or (8) inch round or an 8 x 8" square. If you use a rectangular chimney, the minimum area it may be is 39 square inches.
USSC
FLUE RECOMMEND A
CHIMNEY INSTALLATION
With the chimney being the most important part to your installation, great care should be given to its design.
MASONRY CHIMNEYS
FACTORY-BUILT OR METAL CHIMNEYS
If your home has an existing metal chimney, the same rules apply as with masonry chimneys. One thing to be especially aware of is that "Class B" chimneys are for gas appliances only, not solid fuel burners. If purchasing a new package, consult with the dealer. He will provide the necessary parts and instructions for installation.
If your intention is to use an existing masonry chimney, check first with your local building official to see if this is acceptable.
An older chimney, in need of repair, is the GREATEST fire hazard in any installation.
STOVE PIPE (FLUE PIPE) CONNECTION
The flue pipe you should use is 6" or 8" 24 gauge or heavier steel pipe.
INSTALLING A NEW CHIMNEY
When installing a new chimney, whether it be masonry or metal, if possible, it is recommended that it is placed within the house structure. These chimneys remain warmer and, in turn, radiate this warmth into the house. A chimney located outside the house is exposed to cold temperatures which encourages creosote build-up and poor chimney draft.
CONNECTING STOVE PIPE TO A METAL
CHIMNEY
When installing the flue pipe, make sure all joints are secured with at least three (3) sheet metal screws. This includes the connection to the flue collar of the furnace. For added protection, use some high temperature furnace cement to seal each joint.
The stove pipe should slope upward to the chimney at a rate of 1/2 inch per foot. Any horizontal runs of stove pipe should not exceed six (6) feet and it should be supported every four (4) feet. Note: Flue pipe should be attached inside the flue pipe collar to prevent creosote from running down onto electrical motors.
CONNECTION OF FLUE PIPE TO A
MASONRY CHIMNEY
When using a metal chimney, part of the installation package should include a stove pipe connector. Follow the instructions provided with the chimney and its parts.
CHIMNEY DRAFT REGULATORS
(OPTIONAL) BAROMETRIC DAMPER
These devices are used to help maintain adequate chimney draft automatically. They should be installed according to their instructions and set at .04 to .06 inches of water column.
MANUAL DAMPER
(RECOMMENDED FOR ADDED SAFETY)
When connecting flue pipe to a masonry chimney, there are two ways to go:
1. The flue pipe itself can be cemented into the chimney or;
2. A thimble can be used which is cemented into the chimney, and the flue pipe fits into the thimble.
In each case, care must be taken. The outer masonry (brick or block) must be chipped away, and the inner liner must be pierced. The flue pipe or thimble is then inserted flush to the inside face of the tile liner. NOT ANY FURTHER!
Use furnace cement or mortar to seal this connection. When connecting the flue pipe, make sure the attachment is secure enough so down draft or "puffs" do not dislodge it.
USSC
These are used to control chimney draft manually and should be installed in a convenient place between furnace and chimney. In the event of a chimney fire, it should be closed reducing air to the chimney fire.
A combination of both barometric damper and manual damper may be used. If this is the case, install the manual damper between the barometric damper and the chimney.
VENTILATION FOR YOUR FURNACE
There are many appliances which require "make up" air to operate. However, with a combustion air draft fan, "makeup" air is not usually necessary with your wood furnace.
If your home is sealed exceptionally well, use a 3" or 4" diameter duct vented to the outside and terminating in the vicinity of the combustion air draft fan. Also, it is possible for your fans to draw in furnace smoke if there is only dead air in the area. Note: It's highly recommended that a cold air return system be utilized. Simply attach a 14" round to a filter box adapter and attach to cold air return. Also, a cold air return increases motor life.
Page 9
ASSEMBL Y ILL USTRA TIONS
NOTE: Your furnace may come partially pre-assembled, but in the case that it is not, follow the instructions below. Also use these instructions for future maintenance and disassembly. Drawings and photos are for illustration purposes only. Actual parts may differ.
Prior to assembling, place the unit in the general vicinity of the installation. This should help minimize handling damage to the unit after assembly.
2.
Attaching the distribution fans. Using four(4) of the supplied 1/4-20 self-tapping bolts, first install the blower motor on the right looking at the rear of the furnace. Then proceed to mount the left blower.
Be sure to place the supplied gaskets between the motors and firebox back as shown.
1. Unit side shrouds can be assemble by slipping the side shrouds into place from the top down. If they don't slide easily, open up the lip of the sides with a large screw driver then add a little oil. Sometimes a slight tapping with a block of wood and hammer may be required, but do not force. When properly installed, the electrical knock-outs will be at the top left side. NOTE: Should you wish to install a domestic hot water coil, it should be secured to the right side prior to assembly. Also, the rear cast iron baffle must be fastened prior to shroud installation.
NOTE: The furnace is partially prewired all that is required is the wiring of the distribution fan (see wiring diagram, page 18) and the wiring to wall the thermostat.
3.
Attach the draft fan to the back of the weld on the throat (2" throat hole with 3 mounting holes).
It's best to use the self tapping screws without the draft fan to establish threads then mount blower.
The electrical box on the blower should be facing downward. Draft fan air intake cover should be set at a 20% opening, about 1/2" opening.
Page 10
4.
After mounting the three (3) fans proceed to the fan control center.
NOTE: The best maintenance for fan motors is to keep them clean (exceptionally clean). Oiling with 20W N. detergent once a season will also help, but cleanliness is what prolongs motors life.
The distribution motors have sealed ball bearing motors and should not need oiling. However, if an oil tube is present, you should oil the motors once a season as mentioned.
USSC
ASSEMBL Y ILL USTRA TIONS
5a.
Attaching furnace control center box. To separate outer cover, remove two (2) side screws and pull off black rheostat knob. Attach box to left side (facing feed door) with four (4) self-threading screws. One screw in each corner. (NOTE:
Furnace control center is designed for left side
5b.
attachment. Should space prohibit such, reversing shrouds for right side installation is possible, however, control wires from box will have to be extended.)
Next, attach the 4x4 junction box below the control center box, using (2) self-threading screws provided in the parts bag. (Two starter holes are provided.)
7.
Wall thermostat should be mounted on an upstairs inside wall (no outside facing wall) preferably near your existing thermostat. For more specific information, read the Honeywell instruction sheet provided with thermostat. Caution: disconnect the power supply before installing. NOTE:
Your wall thermostat and transfer relay are mated
Honeywell products for trouble free installation.
6.
Attach low voltage thermostat No. 18 up to 30 ft.
run No. 16 to 15ft. Run (purchase locally) to terminal plate, screws identified with letters G & R.
(Generally top row center, bottom row right).
Snake wire through holes in top of box. Replace outer covers & control knob. Under no circumstances should you attempt to plug in main power cord until all wiring and covers are in place.
NOTE: A ground power cord plug is provided; however, local codes may require fuse box
USSC mounting.
8.
Install top shroud (if removed) by simply placing shroud on to the top of unit, push down, check each corner for snug fit.
Page 11
ASSEMBL Y ILL USTRA TIONS
CAUTION: Any hot air plenum connection to a furnace must be constructed of metal.
9.
Installing collar to top: To install hot air attaching collar, simply bend all tabs right angle under shroud. This may be possible with thumbs, if not, remove top and use small hammer.
11
.
Installing Grates: Install grates together, slip shaker lug into hole and place grates into frame. Grate arch faces upward. Check out grate rotation by placing shaker handle on grate lug (3/4"). Grates should rotate freely.
NOTE: Grates are designed to withstand high temperatures, however, should you overfire the furnace you may fuse or melt grates. This happens if furnace receives too much air caused by leaving the ash and feed doors open, draft fan cover wide open, and hot coals or ashes are excessive in ash pan.
10. Install grate frame (if not already installed): Lay the first grate frame on the side supports and slide to the back of the unit. Then install the second grate frame to the front as shown in the picture above. The smooth ends of the frames should be together in the middle. For the model 30A, insert the half grate frame in the middle of the front and rear frames.
12. Installing Firebrick: Place 5 bricks on each side
(10 brick total). The bricks tuck under firebox seem.
For the 30A model, use six(6) full brick and 1 half brick per side. (12 full and 2 half brick total)
Page 12 USSC
ASSEMBL Y ILL USTRA TIONS
13 . Installing front and rear cast baffles, heat plates.
NOTE: Grate frames and brick will slide forward and backward to allow baffle to fit. Install front cast baffle using two (2) 5/16 bolts, nuts & washers (7/16 wrench will be needed). Place the side of the baffle that has the two ribs against the front weld of the firebox. Do not tighten bolts yet.
Place the rear cast baffle to the back of the firebox but do not attach the bolts at this time.
15 . Installing smoke damper rod to sliding smoke damper. First, insert rod through hole above feed door and push forward.
14. Now slip the rear heat plate in behind the rear baffle. Attach heat plate to the firebox by using two (2) 5/16 bolts, nuts & washers. First, line up the top holes and tighten bolts. Secondly, line up the holes in the rear baffle and the heat plate with the firebox and attach by using two (2) 5/16 bolts, nuts & washers. Tighten all four (4) bolts.
NOTE: to reach rear bolts you may find it easier to put your arm through the flue outlet rather than to reach through the feed door.
USSC
16 . Next working through the flue hole behind furnace, line up rod between the two posts on the sliding smoke damper. Then line up the three (3) holes for cotter pin insertion, this procedure will test your patience. It's helpful to have a flashlight and another person positioning the rod.
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ASSEMBL Y ILL USTRA TIONS
17. To install Feed Door handle, insert handle into the door then attach with the 1/2-13 nut and washer provided. Tighten nut against the backside of the door then back it off approx. 1/4 turn or until handle moves freely. (Follow these instructions for ash door handle installation.)
19. To install the dampers on the doors, screw the damper up onto the 1/2-13 carriage bolt provided. Then screw the damper and bolt into the door until the bolt protrudes the rear of the door so that a nut can be attached. Tighten the nut.
18. Find the Feed Door Latch shown in the parts box.
Install with the 1/4-20 bolts and nuts provided.
Adjust the latch so that the door seals properly.
(The ash door latch shall be assembled in the same manner using the ash door latch.)
18. Installing steel smoke shield. Two (2) holes are provided above each corner of the feed door.
Slide the two (2) bolts, supplied in the parts bag, into the holes. Next, place the two (2) clips provided onto each bolt and then attach the two
(2) nuts on each bolt. Before tightening the bolts and nuts securely, slide the smoke shield up under the clips, lining them with the slots in the smoke shield. Tighten the (2) bolts and nuts. (NOTE: The smoke shield should be able to swing back and forth.) The smoke shield will help prevent smoke back puffing if you have a lazy flue.
Page 14 USSC
170 degree limit disc
CONTROL BO X & ELECTRICAL COMPONENT
140 degree adjustable disc.
(Left Dist. Blower)
140 degree adjustable disc.
(Right Dist. Blower)
ELECTRICAL COMPONENTS
Wall Thermostat
*(2) 140 degree Adjustable Thermo Disk
*(1)170 degree Thermo Limit Disk
*(1)Relay Transformer
(2) Air Distribution Fan
(1)Draft, Fan
* Control Box Components
10 BASIC FUNCTIONS OF ELECTRICAL SYSTEM
--
--
--
--
--
--
--
1.
2.
3.
4.
USSC
Relay...electrical switching device,
Rheostat...current (voltage) reducer increases or decreases draft fan R.P.M.
Distribution Capacitor: Reduces amps required to activate distribution fan.
Transformer: Reduces voltage 110 volts to 24 volts for thermostat usage. Generally hums a bit.
170 degree limit disk...breaks off electrical current to the draft fan at 170 degrees
(2) adjustable140 degree limit disc...closes at set temperature to operate distribution blowers.
Thermodisc’s range is 95-140. (see illustration for location)
Draft fan...small fan that activates fire, increasing fire temperature.
Wall mounted thermostat requests heat...electrical
contact occurs.
Current is sent through relay, rheostat, 170 degrees thermo limit disk to activate draft fan.
Upon firebox temperature rise due to air from draft fan, current passes thru the top/right thermodisc to activate the left distribution fan. The factory seting is approximately 120 degrees air temperature, 500 CFM of air at 120 degrees.
Should firebox temperature air reach 140 degrees, current is directed thru the bottom/right thermodisc to activate the second fan for 1,000
CFM of air.
Both blowers will continue to run until air temperature drops approx. 20 degrees below the set point on the thermodisc.
The above is somewhat basic, however, it's offered so you can understand your furnaces electrical functions and enjoy it more.
Your new furnace is now completely assembled and ready to be installed. Make sure you followed the sections on installation in the front of this manual.
OPERATION OF YOUR NEW SOILD
FUEL BURNING FURNACE.
Check that your draft blower is in working order before lighting a fire (cover setting 20% open).
Do this by turning the room thermostat to a high temperature so that the draft blower turns on, then turn the thermostat back to proper setting thus turning the draft air blower off. Should draft blower not function, check to see if rheostat setting is on.
NOW PROCEED WITH LIGHTING
A FIRE.
CAUTION:
Never use chemicals or fluids such as gasoline, charcoal lighter fluid, drain oil or kerosene to light a fire in your furnace. This would be like checking the level of gas in your car with a lighted match.
1.
2.
3.
4.
Pull bypass damper out (opens up flue hole).
Make sure your flue pipe damper is open. Place several pieces of crumpled paper in the center of your firebox. In a crisscross pattern, place a couple of handfuls of dry kindling wood, then several small dry pieces of firewood.
Ignite the paper and close the door. Do not attempt to open the door immediately after igniting the fire. There could be a flame flash out.
It will take a few minutes for the fire to establish itself. Once you have some good red hot burning coals, add larger pieces of wood. All Chimneys and hookups act differently. After a while, you will find out how your unit works best for starting.
Page 15
5.
6.
7.
8.
9.
Push in bypass damper after fire has progressed.
Your furnace is capable of putting out many BTU's, so don't fully load your furnace until you have become familiar with the operation of the furnace.
Keep in mind, a full load will not always give you the best results for your needs. Note: With new steel, there is a small amount of oil or dirt on the metal. You may smell an odor. This is normal during the first operation. You may want to assemble the furnace out of doors and build a small fire in it to "burn off" this dirt and oil before installing the unit.
MAINTENANCE
Keep chimney and flue pipe clean by cleaning at least twice during a heating season.
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.
When loading your furnace that has existing hot coals, pull the bypass damper out and rake the red hot embers over grate evenly. Put a few smaller pieces of wood on the coals first, then load up to the middle of the feed door.
Set rheostat setting for type and condition of coal or wood. Hard coal and wood requires more forced air than soft, so experiment with dial setting. Start with a center dial setting. The draft fan cover also requires experimenting with. Start with a 20% opening.
The chimney connector and chimney should be inspected at least twice monthly 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.
CAUTION
If you have a chimney fire, we recommend the following immediate actions:
Set the furnace thermostat for comfort. Set the other thermostat 10 degrees lower.
1.
Alert everyone in the house.
10.
Use caution when opening loading door. Avoid opening loading door rapidly. This could cause flames to flash out the door. This occurs when there is unburned fuel and a large amount of gases on the top of the firebox. When the door is opened oxygen is combined with the gases and ignites.
2.
3.
Shut any furnace doors, disconnect power to the unit, and close any dampers. This should take no longer than a few seconds.
Call the fire department.
ASH REMOVAL
Every morning when there is just a bed of hot embers, shake the grate very, very lightly.
Keeping your chimney and stove pipe clean is the best insurance against chimney fires. Note: Smoke detectors and fire extinguishers should always be a part of your equipment.
Once every week or two, depending on how much fuel you burn, ashes should be removed. Note: A 2" to 3" bed of ashes will prolong wood burning and protect grates.
If you clean your own chimney and stove pipe, we recommended purchasing the equipment professionals use. Wire brushes are available in enough sizes and shapes to be a snug fit inside any common flue.
CAUTION
Never let ashes build up to grate level. This will reduce the life span of your grate, and void grate warranty.
To remove ash pan simply open ash door and pull out your ash pan. But remember, the ash pan can get very hot. Dump ashes in a metal container with a lid and place on a non-combustible surface.
Once a week let your furnace burn with ash door open for a maximum of fifteen minutes while in attendance. This will help minimize creosote buildup.
Also placing a surface magnetic thermometer on flue pipe is helpful to keep temperatures at 300 to
400 degrees. Duct temperatures should be 115 to
125 degrees at 12" above furnace.
CAUTION
Never use anything but a metal container to put your ashes in. Every year fires are caused by emptying ashes into cardboard boxes or paper bags.
Page 16 USSC
OPERA TION
BURNING COAL
Your furnace is capable of burning both Bituminous and Anthracite coal. Anthracite is perhaps the best coal fuel because its long even burn time, high heat output, and cleanliness 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 expensive than bituminous.
of the ashes without 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.
For overnight operation (long duration burn time) shake the fire and add coal, retaining your center cone. Once the volatiles are burned off, close the feed door and adjust your stove pipe damper. Then adjust your thermostat to the desired heat level.
You will have more MAINTENANCE with bituminous than with anthracite coal as more soot will collect on heating surfaces and in pipes, requiring more frequent cleaning.
SIZE OF COAL:
Most sizes of Bituminous Coal will work in your New Furnace, for best results we recommend large nut coal to small egg coal (1-3/4" dia. to
4" dia.). When burning Anthracite, use egg or broken with sizes between 2-5/16" thru 4-3/8". Note that it is important to the long life of your furnace to buy coal which has been sized and cleaned. Cleaning insures removal of rocks and other materials. 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 resinous soft woods as kindling, with hard wood (oak, hickory, ash) added to increase the heat prior to addition of the coal.
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 result, should be fired with the "conical method" - with the highest portion of your firebed in the center of the firebox. The first flames will be long and generally orange or yellow and produce quite a bit of smoke. As the gases burn off the flames become shorter, change colorand produce less smoke. 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. You will have to experiment with your particular setup as no two chimney's or installations are going to be the same. Just remember to allow enough secondary air to enter the firebox and keep your stove pipe damper open so that volatiles are properly burned. Before refueling, take the time to break up the cone a little with a poker, especially if it has caked over or formed a crust. But, be careful not to mix the coal as this increases the chances of forming clinkers. When shaking the grate(s) be gentle.
Just a few short movements is better than a lot of agitation. The objective is to remove a small amount
USSC
ANTHRACITE:
Before starting the fire open - the stove pipe damper, open the ash pit door and feed door, place newspaper, finely split kindling on the grate, and light the paper. Add larger hard wood after kindling is burning brightly. CAUTION: Never use gasoline, lantern fuel, kerosene, charcoal lighter fluid, or other flammable liquids to start or freshen up a fire
in this 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.
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 heavier 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 you have closed your ash door.
Before adding further fuel, be sure you leave a red spot of glowing coals in the center of the firebox to insure that you have not smothered the fire and to help ignite thegases given off by the new charge. A deep charge will give a more even heat and a longer fire, but it may take one to two hours before the whole bed is fully ignited.
When the fire is well established and the room is becoming warm, partially close the dampers. You will have to experiment with your particular setting of the damper and controls as your 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. 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 you will see short blue flames above the coal, except when the fire is started or a new charge is added. If, however, there
Page 17
OPERA TION
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).
Only when the coal is burned down to half its original depth is it time to add fresh coal. When doing so, open your stove pipe damper, 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 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 your furnace. Experience will be your best teacher.
BANKING THE FIRE:
For extended operation, such as overnight, you will need to bank the fire. 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. You will also reduce the intensity of the fire without letting it go out. Follow the same procedure as for refueling. If possible, avoid shaking, as a heavier layer of ash will help reduce the intensity of the fire during this time. After loading, let the fire establish itself for about 30 minutes. Then close your damper 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.
To revive a coal fire that is almost out, you should (1) open the ash door and stove pipe damper 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 little) and you will be ready to refuel.
DO NOT burn coke, charcoal, high volatile bituminous coal, sub bituminous, lignite or cannel coal
(sometimes called channel coal or candle coal).
NEVER burn wax or chemically impregnated sawdust logs - their intended use is for fireplaces only. NEVER fill your stove or furnace above the firebrick or cas iron liner.
SHAKING:
Shaking should be done only when there is a hot fire.
The frequency of shaking will depend on the degree of burning. Shaking should be done at least once a day and preferably twice a day.
Best results from shaking the rocker grates will occur if short "choppy" strokes are used rather than long, even strokes.
Page 18
The amount of shaking is critical. Too little or too much of both can result in the extinguishing of a fire due to blocked air flow. The proper amount normally occurs when red coals first start to drop through onto the bed of ashes.
No furnace ever should be "poled" from the top. This can lead to clinker formation and compacting of the coal and ashes, which results in clogged air passages.
ASHES:
Ashes never should be allowed to accumulate in the ash pit so that they in any way impede the flow of combustion air to the fire. Excess ash accumulation can cause the fire to go out and also can cause severe damage to the grates because of the absence of a cooling flow of air beneath them.
Ashes always should be emptied into a metal container. Coals can remain hot many hours after a fire is out. Coal ashes should not be put on gardens as they do not contain beneficial minerals like wood ashes, and may cause ground water pollution.
Coal produces considerably more ash than wood, so the intervals between emptying are much shorter.
For equal heat output, coal will produce seven (7) to ten (10) times more ash than wood.
CLINKERS:
Clinkers can occur in any coal furnace during the process of burning. These are hard pieces of fused ash that form in the firebox. They can become hard and large in size and, therefore, cannot be shaken through the grates in a coal stove. When there is an appreciable accumulation, the fire will go out because insufficient air is allowed to pass through the clinkers to the burning coal.
Once large clinkers have formed, they can be removed only from above the grates. This usually means the fire must be allowed to go out before they can be removed.
Clinkers formation can occur from a number of different causes or a combination of causes. Some of these are:
• Poor quality coal-excess ash content and/or too low a heat of fusion.
• Too hot a fire (too much draft).
• Too shallow a bed of coals.
• Too deep a bed of coals.
• Excessive Shaking.
• Poking the fire from the top.
• Too little air (draft) after a long, hot fire (caused by rapid adjustment of draft from a very high setting to a low setting).
USSC
SAFETY - OPERA TION
Whenever the loading door is opened, it should be cracked slightly (for about ten (10) seconds) to allow oxygen to enter and burn any combustible gases that are present before fully opening. Failure to do this could result in sudden ignition of the unburned gases when the door is opened. This furnace is equipped with a safety latch system to reduce the rsik of sucjh an ignition. Always wear a glove to protect you hand from the heat.
With the exception of the start-up period, the ash pit door should never be left open. Serious damage to the stove can occur from overheating. In extreme cases, this overheating could be the cause of an "unfriendly fire".
Coal furnaces are subject to the same installation clearance standards as wood furnaces. Never burn coal in any furnace that does not have an airtight, unified chimney system.
Coal furnaces should not be installed in any chimney that has had a history of back-drafting or flow reversal. Also, coal furnaces should not be installed in any chimney having an excessively large flue. These conditions can cause improper draft, resulting in carbon monoxide entering the house rather than being drawn up the chimney. Remember, coal gases are toxic.
Sulfur dioxide, sulfur trioxide and other ions released from coal burning may corrode stainless and masonry chimneys, and even terra cotta chimney liners and brick in nearby buildings. Coal with high sulfur content will destroy chimneys especially fast if soot sits in the flue for extended lengths of time. It is important to clean chimneys regularly.
CAUTION
HOT WHILE IN OPERATION. CONTACT MAY CAUSE SKIN BURNS. KEEP
FURNISHINGS AND OTHER COMBUSTIBLE MATERIALS A CONSIDERABLE
DISTANCE AWAY. TO AVOID EXCESSIVE TEMPERATURES, DO NOT OPER-
ATE WITH THE FUEL FEED AND ASH DOORS OPEN. TO PREVENT FLAME
AND SMOKE SPILLAGE, THE SLIDE BAFFLE MUST BE PULLED OUT AND THE
FEED DOOR MUST BE CRACKED FOR 10-15 SECONDS BEFORE DOOR IS
OPENED FULLY.
Domestic Hot Water Coil
Part # 11WCK
USSC Page 19
TROUBLE-SHOOTING, PROBLEM SOLVING FOR YOUR FURNACE
1.
Problem: Smoke puffs from furnace.
Solution:
A.
Check chimney draft. Check for blocked chimney or flue pipe. Use mirror to check chimney clearance.
B.
D.
Check ash pit - if too full, empty.
C.
Make sure furnace room is not too airtight.
Make sure all chimney mortar connections are air tight.
E.
F.
Check clean out door. Make sure it's airtight.
Check chimney for possible down-draft caused by taller surrounding trees or objects. Correct with proper chimney vent cap.
G.
Check the possibility of cold chimney forcing
H.
I.
cool gas blockage. Remedy by properly insulating chimney with noncombustible liner and non- combustible insulation.
Fuel may be too wet.
Make sure no other fuel burning devices are connected to the chimney impairing the draft.
2.
Problem: Inadequate heating being delivered to your home.
Solution:
A.
B.
Check home insulation - is it adequate?
Check hookup to furnace - is it installed correctly? (review manual)
C.
Cool air inlet may be inadequate or furnace
D.
room too airtight, 14" inlet for 12" outlet.
Your wood fuel may be too low grade. Hard
E.
woods are recommended.
Make sure your hot air duct (and other duct work) is airtight.
If furnace room is warm but your home isn't,
F.
H.
check back draft dampers.
Is air inlet to the blower open? Check filters.
G.
Fuel may be too wet.
Check draft blower cover, setting 1/2" opening.
I.
Rheostat setting is fully open.
3.
Problem: Excess smoke or flames coming out door when refueling.
Solution:
A.
Open bypass damper. Wait 15 seconds and open door slowly - then refuel.
B.
Check length of flue pipe to chimney. Your unit should be within six (6) feet of your chimney.
C.
Make sure chimney cap is not too close to the
D.
top of the chimney.
Check chimney draft-make sure chimney flue
E.
pipe is clean and chimney is of adequate height.
Make sure you're not suffocating the fire with excess amounts of unburned fuel.
Page 20
4.
Problem: Distribution blower vibrating.
Solution:
A.
B.
C.
Tighten Allen Screw on squirrel cage.
Check for bad fan bearings.
Also oil 3-4 drops of 20w non detergent oil.
5.
Problem: Distribution blower continues to run or will not run.
Solution:
A.
Check to see if thermodisc 110 degrees (top
B.
right side) is faulty. Use match or lighter for click or jumper wire.
Check to see that blower is properly wired. (See
Wiring and Assembly Instructions).
6.
Problem: Draft blower continues to run or will not run.
Solution:
A.
Check rheostat switch for on position. Check
B.
wiring.
Check thermostat or thermostat wire for short.
Make sure temperature is calling for or not calling for heat. Set thermostat at 80 degrees.
C.
Check to see if thermodisc 170 degrees (left side) is faulty. Use match or lighter for click or jumper wire.
7.
Problem: Odor from first fire.
Solution:
A.
The odor remains, call your dealer immediately.
A defective weld can cause a fume leak.
8.
Problem: Excessive creosote.
Solution:
A.
B.
Check the grade of wood you are burning.
Make sure your unit is serviced by its own proper
C.
D.
chimney.
Check length of flue pipe and its connections.
Make sure you are burning the smallest, hottest fire to adequately heat your home.
E.
F.
Also see Solutions to Problem 1.
Use a magnetic surface thermometer on flue pipe and operate between 300 and 400 degrees.
9.
Problem: Poor seal around unit door.
Solution:
A.
Bend door latch in to tighten seals.
USSC
AIR P ARTS DIA GRAM
USSC Page 21
Page 22
P ARTS LIST
KEY PART #
25
26
27
28
22
-
23
24
18
19
20
21
14
15
16
17
10
11
12
13
8
9
6
7
4
5
3
-
2
-
1
-
38
39
40
41
34
35
36
37
29
30
-
N/S
40350
24828
25612
83874
31 89066
N/S 891414
32
33
24220
C97999
42
43
44
89799
80496
89319
80422
69081
24492
80130
80388
80390
80090
80131
23786
83339
83250
23823
891135
24501
83445
23787
69543
69568
40366
24487
24496
40369
40349
40376
24490
25613
24489
25614
24488
25615
69542
69559
89636
83835
83444
40379
83503
83274
891423
83045A
45 80231
DESCRIPTION
LEFT CABINET SIDE
LEFT CABINET SIDE (30A)
RIGHT CABINET SIDE
RIGHT CABINET SIDE (30A)
CABINET TOP
CABINET TOP (30A)
ASSY., FEED DOOR
ASSY., ASH DOOR
DOOR HANDLE
1/2” WASHER
1/2-13 LOCK NUT
SPIN DAMPER
3/8” CARRIAGE BOLT
3/8-16 LOCK NUT
DOOR PIN
3/8” WASHER ( USED FOR DOOR ADJUSTMENT )
DOOR LATCH (FEED DOOR)
1/4-20 BOLT
1/4-20 KEP NUT
LATCH CATCH (ASH DOOR)
SPRING HANDLE (NICKEL)
SMOKE CURTAIN
1/4-20 CARRAIGE BOLT
SMOKE CURTAIN CLIP
ASH PAN ASSEMBLY
ASH PAN ASSEMBLY (30A)
FIREBOX LINER
REAR HEAT PANEL
FRONT HEAT PANEL
SHAKER GRATE FRAME
SHAKER GRATE
HALF GRATE FRAME (30A)
HALF GRATE (30A)
DAMPER ROD
DAMPER ROD (30A)
1/8 DIA. x 1-1/2" COTTER PIN
FIREBRICK ( MODEL 30A USES TWO(2) MORE BRICK )
HALF FIREBRICK (30A ONLY)
INSIDE COVER PLATE
GASKET, WATER COIL COVER
STUB COLLAR
500 CFM BLOWER
BLOWER GASKET
FORCED DRAFT BLOWER
CONTROL CENTER BASE ASSEMBLY
CONTROL CENTER COVER
TRANSFORMER, FAN CENTER
ADJUSTABLE 140°F THERMODISC
LIMIT DISC, 170°F
RHEOSTAT w/KNOB
4 x 4 JUNCTION BOX
COVER, JUNCTION BOX
QTY.
1
1
1
3
1
4
1
2
2
1
4
4
4
2
2
2
2
1
2
1
1
1
2
1
1
1
2
2
1
1
1
1
2
1
1
1
1
1
1
10 (2)
2
1
2
2
1
1
1
USSC
WIRING SCHEMA TIC
USSC Page 23
For service questions, contact US Stove at 1-800-750-2723.
For sales inquiries, contact Sylvane at 1-800-934-9194 or visit www.sylvane.com.
HOW TO ORDER REP AIR P
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: 24A 30A
4. THE SERIAL NUMBER:
____________________
Page 24
UNITED STATES STOVE COMPANY
227 INDUSTRIAL PARK ROAD
PO BOX 151
SOUTH PITTSBURG, TN 37380
(423) 837-2100 www.USSTOVE.com
USSC
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