Jensen Wood Boiler Manual

Wood & Coal Burning Furnace  
Owners Manual  
Models: 24A, 30A  
TESTED TO UL 391  
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  
USSC  
851731  

Expand Contents

WELCOME  
...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 instal-  
lation 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 last-  
ing 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.  
TABLE 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  
GENERAL RULES  
Rules for the Safe Installation and Operation of Your The furnace is designed to burn air dried wood and  
Furnace...  
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.  
Check local codes, the installation must comply with  
strict conformance in regard to clearances.  
The Furnace must be installed on a noncombustible  
floor.  
Follow a regular service and maintenance schedule  
of the furnace and chimney for efficient and safe op-  
eration.  
Connect the furnace to tile lined inside masonry chim-  
ney or approved insulated all fuel prefabricated chim-  
ney only.  
Do not leave the ash door open when the fire is burn-  
ing.  
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 open-  
ing.  
Do not let ashes build up closer than 2" to the grate.  
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.  
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 oper-  
ate at .04 to .06 inches of water column and must be  
set with a draft gauge to maintain a steady draft.  
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 use flammable liquids for starting a fire.  
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 dam-  
age.  
DO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE  
SERVING ANOTHER APPLIANCE.  
BURN WOOD OR COAL ONLY THESE MODELS. DO NOT  
MIX OTHER THAN THE USE OF WOOD TO START A COAL  
FIRE.  
Store all ashes in a metal container with a tight seal-  
ing lid and allow ashes to cool before disposing of  
them, possibly a week.  
DANGER - Risk of Fire or Explosion: Do not burn gar-  
bage, gasoline, drain oil or other flammable liquids.  
Familiarize yourself with the furnace's solid fuel burn-  
ing characteristics before leaving unit unattended for  
long periods of time.  
WARNING - Risk of Fire:  
Do not operate with flue draft exceeding 6 inches wa-  
ter column.  
The loading door and ash door must be tightly closed  
during furnace operation to insure safety and effi-  
ciency.  
Do not operate with fuel loading or ash removal doors  
open.  
CAUTION -  
Do not store fuel or other combustible material within  
marked installation clearances.  
The furnace has hot surfaces. Keep Children Away.  
Do not touch during operation.  
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.  
In the event of a chimney fire call the fire depart-  
ment, then be sure the furnace doors are closed  
tightly and the power to the unit is turned off.  
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 burn-  
ing rate common to other units on the market. The  
fire, however, must be started and subsequent fuel  
added by the user.  
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 immedi-  
ately void any warranty.  
Conventional heating system produce heat only  
when the thermostat calls for heat. This way of heat-  
ing 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.  
USSC  
Page 5  
INSTALLATION  
Furnace location  
Before you start!  
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 chim-  
ney connector should not have to run more than six  
(6) feet to the chimney.  
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 per-  
taining to the location and installation of your fur-  
nace.  
The ideal location for your furnace is centrally located  
in the basement. This allows for an even heat distri-  
bution 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 combus-  
tion air.  
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  
INSTALLATION #2  
With this installation, a back draft damper (optional) Extending the hot air duct from the furnace into the  
is inserted into the heat run before the plenum of the existing plenum will help direct the flow of air from  
existing furnace to prevent air from the existing fur- the furnace as well as the flow in the existing furnace.  
nace to blow back into the furnace when it is not in Ducting entering the existing plenum at an angle (ap-  
use. When a back damper is employed, it should be proximately 45 degrees) will facilitate air flow from  
located as close to the existing furnace plenum as the furnace while diverting air from the existing fur-  
practical.  
nace.  
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.  
Page 6  
USSC  
INSTALLATION  
Your furnace is designed to be added on to existing  
Clearance to Combustibles  
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.  
Furnace to back wall  
Furnace to side wall  
Pipe to back wall  
Pipe to side wall  
30"  
12"  
18"  
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 mini-  
mum clearances. Make sure you follow these when  
choosing your furnace location.  
18"  
Furnace to ceiling  
Ductwork to ceiling  
30"  
18-6-1"  
Any hot air plenum connection to a furnace must be  
constructed of metal.  
NOTE: INSTALL ONLY ON A NON-COMBUSTIBLE FLOOR.  
USSC  
Page 7  
FLUE RECOMMENDATIONS  
CAUTION!  
Only a "Class A", all-fuel chimney in-  
tended 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 all-  
fuel 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 mini-  
mum area it may be is 39 square inches.  
Page 8  
USSC  
FLUE RECOMMENDATIONS  
CHIMNEY INSTALLATION  
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 espe-  
cially aware of is that "Class B" chimneys are for gas appli-  
ances only, not solid fuel burners. If purchasing a new pack-  
age, consult with the dealer. He will provide the necessary  
parts and instructions for installation.  
With the chimney being the most important part to  
your installation, great care should be given to its  
design.  
MASONRY CHIMNEYS  
If your intention is to use an existing masonry chim-  
ney, check first with your local building official to see  
if this is acceptable.  
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 lo-  
cated outside the house is exposed to cold temperatures  
which encourages creosote build-up and poor chimney  
draft.  
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.  
CONNECTING STOVE PIPE TO A METAL  
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.  
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 fur-  
nace. For added protection, use some high tempera-  
ture 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 pre-  
vent creosote from running down onto electrical  
motors.  
CHIMNEY  
(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.  
DRAFT  
REGULATORS  
MANUAL DAMPER  
CONNECTION OF FLUE PIPE TO A  
MASONRY CHIMNEY  
(RECOMMENDED FOR ADDED SAFETY)  
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.  
When connecting flue pipe to a masonry chimney,  
there are two ways to go:  
1. The flue pipe itself can be cemented into the chim-  
ney or;  
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.  
2. A thimble can be used which is cemented into the  
chimney, and the flue pipe fits into the thimble.  
VENTILATION FOR YOUR FURNACE  
There are many appliances which require "make up" air to  
operate. However, with a combustion air draft fan, "make-  
up" air is not usually necessary with your wood furnace.  
In each case, care must be taken. The outer ma-  
sonry (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!  
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.  
Use furnace cement or mortar to seal this connec-  
tion. When connecting the flue pipe, make sure the  
attachment is secure enough so down draft or "puffs"  
do not dislodge it.  
USSC  
Page 9