USSC Hotblast 1500 User manual

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Models 1500 & 1537G
OWNERS MANUAL
SOLID FUEL
WARM AIR FURNACE
*FOR PARALLEL INSTALLATION WITH
EXISTING FORCED AIR-GAS OR OIL
FIRED FURNACE (U.S. ONLY)
*FOR INSTALLATION AS A CENTRAL
FURNACE
*THE 1500 & 1537G HOTBLAST FUR-
NACES HAS BEEN APPROVED FOR
U.S. INSTALLATIONS ONLY.
*CERTIFIED UNDER ANSI/UL 391 1983
85591R
UNITED STATES STOVE COMPANY
227 Industrial Park Road
P.O.Box 151
South Pittsburg, TN 37380
[phone]
www.USSTOVE.com
CAUTION:
READ ALL INSTRUCTIONS CARE-
FULLY BEFORE STARTING THE
INSTALLATION OR OPERATING
THE FURNACE
IMPROPER INSTALLATION MAY VOID
YOUR WARRANTY
DO NOT USE THIS FURNACE
IN A MOBILE HOME OR TRAILER

2
NOTE: YOUR UNIT MUST BE INSTALLED BY A
QUALIFIED FURNACE INSTALLER.
You've purchased one of America's Finest Wood and Coal
Burning Furnaces. By heating with wood and coal you're
helping CONSERVE AMERICA'S ENERGY! Wood is our
Renewable Energy Resource. Please do your part to
preserve our wood supply. Plant at least one tree each year.
Future generations will thank you.
CONGRATULATIONS!
TOOLS
Pencil
6 Foot Folding Rule or Tape
Tin Snips
Drill, Hand or Electric
Drill Bit- 1/8" Dia.
(For Sheet Metal Screws)
Screw Driver (Blade-Type)
Gloves
Sabre Saw
5/16" Nut Driver or
5/16" Socket w/Ratchet
MATERIAL
6" Pipe, 6" Elbow, Collar and Thimble;
as required (24 gauge min.)
1/2" Sheet Metal Screws
6" Inside diameter Listed Residential
Type or Building Heating Appliance
Chimney or existing masonry chimney
Electrical Wiring
6" Draft Regulator
1/2" Conduit (Conduit Connectors)
Furnace Cement (Manufacturer
Recommends: Rutland Black-Code 78
or Equivalent)
Plenum and Duct work as required.
TOOLS AND MATERIALS NEEDED

3
CAUTION!
CLEANOUT OF THE HEAT EXCHANGER, FLUE PIPE, CHIMNEY,
AND DRAFT INDUCER (IF USED), IS ESPECIALLY IMPORTANT AT
THE END OF THE HEATING SEASON TO MINIMIZE CORROSION
DURING THE SUMMER MONTHS, CAUSED BY ACCUMULATED
ASH.
Caution LabelsCaution Labels
Caution LabelsCaution Labels
Caution Labels
Your Furnace has the following labels. Read and Obey all labels.
DANGER: RISK OF FIRE OR EXPLOSION.
DO NOT burn garbage, gasoline, drain oil, or other flammable liquids.
WARNING: FIRE HAZARD.
DO NOT operate with fire draft exceeding .06 inches w.c.
DO NOT operate with fuel loading or ash removal doors open.
DO NOT store fuels, paints, thinners, flammable liquids, or other highly
volatile substances in the furnace room.
CAUTION: HOT SURFACES
Keep children away.
Do not touch during operation.
_______________________CAUTION!________________________
INSPECT FLUE PIPES, FLUE PIPE JOINTS AND FLUE PIPE SEALS
REGULARLY TO ENSURE THAT SMOKE AND FLUE GASES ARE
NOT DRAWN INTO, AND CIRCULATED BY, THE AIR CIRCULATION
SYSTEM.
fire may result. For your safety, follow
the installation directions. Contact local building or
fire officials about restrictions and installation in-
spection requirements in your area.
SAFETY NOTICE: If this heater is not properly installed, a house

4
1. Check your local codes. The installation must comply with their rulings.
2. Do not install this furnace in a mobile home or trailer.
3. Always connect this furnace to a chimney and vent to the outside. Never vent to another
room or inside a building.
4. Do not connect this furnace to an aluminum Type B gas vent. This is not safe and is
prohibited by the National Fire Protection Association Code. This furnace requires a
masonry or Listed Factory Built Chimney for residential type or Building Heating Appliance
Chimney. Use a 6" diameter chimney or larger, that is high enough to give a good draft. (See
page 7)
5. Be sure that if a masonry chimney is used, it is safely constructed and in good repair. Have
the chimney inspected by the Fire Department or an inspector.
6. Inspect chimney connector and chimney before and frequently during the heating season
for any deposit of creosote or soot which must be removed (See Chimney Maintenance,
page 15).
7. Provide air for combustion into the room where the furnace is located. If the intake is not
in the same room, air must have free access to the room.
8. CAST IRON PARTS MUST BE "SEASONED" TO AVOID CRACKING, BUILD ONLY
SMALL FIRES ON FIRST USE.
9. To prevent injury, do not allow anyone to use this furnace who is unfamiliar with the
correct operation of the furnace.
10. For further information on using your furnace safely, obtain a copy of the National Fire
Protection Association (NFPA) publication "Chimney's, Fireplaces and Solid Fuel Burning
Appliances" NFPA 211. The address of the NFPA is Batterymarch Park, Quincy, MA 02269.
11. Keep the ashpit section free of excess ashes. Do not allow ashes to stack higher than
the sides of the ash pan.
12. DISPOSAL OF ASHES- Place ashes in a metal container with a tight fitting lid. Keep
the closed container on a noncombustible floor or on the ground, well away from all
combustible materials. Keep the ashes in the closed container until all cinders have
thoroughly cooled. The ashes may be buried in the ground or picked up by a refuse collector.
13. CAUTION- The special paints used on your furnace may give off some smoke while they
are curing during first few fires., Build small fires at first. The metal used in construction of
the furnace and duct work has a light coating of oil. This could give off smoke and/or odor
from registers when furnace is used for the first time. This should disappear after a short
period of time. Once this burn-off has occurred, it should not reoccur.
14. CARING FOR PAINTED PARTS- This furnace has a painted outside jacket, which is
durable, but it will not stand rough handling or abuse. When installing your furnace, use care
in handling. Clean with soap and warm water when furnace in not hot. DO NOT use any
acids or scouring soap, as these wear and dull the finish. DISCOLORATION WILL OCCUR
IF THE FURNACE IS OVERHEATED. FOLLOW OPERATING INSTRUCTIONS CARE-
FULLY.
Your Furnace is designed to be installed in a parallel air flow arrangement with a gas
or oil-fired forced air upflow-type central furnace, or it may be installed as a central
furnace.
Rules for safe installation and operation
Read these rules and the instructions carefully. Failure to follow them will cause a
hazard that could result in death, serious bodily injury, and/or property damage.

5
Your HOTBLAST Furnace is designed
to be a supplemental or central heating source
for your home. This Solid Fuel Furnace may
be installed in conjunction with a properly
operating central furnace that is listed or cer-
tified in accordance with nationally recog-
nized safety standards and equipped with the
required controls and other safety features
and which has been installed in accordance
with appropriate standards of the National
Fire Protection Association with installation
clearances specified in the furnace name-
plate marking. The installation must be ac-
complished by a qualified agency (one who is
engaged in, and is responsible for, or is thor-
oughly familiar with the installation and op-
eration of the gas, oil, and solid fuel burning
heating appliances, who is experienced in
such work, familiar with all the requirements of
the authority having jurisdiction.) The instal-
lation shall be in strict accordance with the
manufacturer's installation instructions fur-
nished with the solid fuel furnace.
The chimney connector of the furnace is
to be installed to provide clearances to com-
bustible material not less than specified in the
individual classifications and marked on the
furnace. The chimney connector must be
connected to a chimney suitable for use with
residential type or building heating appliances
which burn solid fuel.
The Furnace is designed to operate in
either parallel or series air flow arrangement
with the central furnace or as a central fur-
nace.
CENTRAL FURNACE INSTALLATION: As
a central furnace, the unit functions indepen-
dently of any other system. The blower will
come on when the plenum temperature
reaches the setting on the blower control.
PARALLEL INSTALLATION:
(See Optional Wiring Diagram, Page 13, Fig.
13) The design is such that when the blower
comes on, the blower on the central system
also comes on. The blower will only come on
when the temperature in the plenum has
reached the setting on the blower control.
This is to insure that there is sufficient warm air
in the system to make it efficient for the unit to
operate. When the central system thermostat
calls for heat, the central system will operate
by the burner igniting and the blower coming
on. It is possible that both systems will operate
simultaneously. It is recommended that for the
most efficient use of your HOTBLAST Fur-
nace, that it be fired as much as possible in
order to reduce the demand on your existing
central heating system. This unit has an op-
tional forced draft kit that operates from a wall
thermostat. When the temperature falls below
the setting on the wall thermostat, the forced
draft will come on (U.S. Stove Option 11/DIKL)
The warm air supply outlet of the
HOTBLAST Furnace shall not be connected
to the cold air return of the central furnace,
because the possibility exists of components
of the central furnace overheating and caus-
ing the central furnace to operate other than is
intended.
SERIES INSTALLATION:
This type of installation uses only the blowers
of the existing central furnace. The solid fuel
fan/limit control must also control the functions
of the existing furnace. All electrical power
must come from a single branch circuit (See
Fig. 14).
HOW THE FURNACE FUNCTIONS

6
DIMENSIONS OF FURNACE
32-1/8" 1-3/4"
9"
33-7/8"
49-1/8"
24-1/16"
40-11/16"
Figure 1B
1400/1500
Figure 1
Models 1500/
1537G
CAUTION
GASES THAT ARE DRIVEN FROM FRESH
COAL MUST BE BURNED OR THEY WILL
ACCUMULATE AND EXPLODE. NEVER
SMOTHER A FIRE WHEN ADDING FRESH
COAL.
CAUTION
DO NOT OPERATE WITH THE FEED AND/OR
ASH DOOR OPEN. THIS FURNACE IS DE-
SIGNED FOR THERMOSTATIC OPERATION.
OPERATION WITH ANY OF THESE DOORS
OPEN WILL OVERHEAT AND DAMAGE THE
FURNACE.
CAUTION
NEVER USE GASOLINE, GASOLINE-TYPE
LANTERN FUEL, KEROSENE, CHARCOAL
LIGHTER FLUID, OR FLAMMABLE LIQUIDS
TO START OR "FRESHEN UP" A FIRE IN THE
FURNACE.
WARNING
NEVER STORE FLAMMABLE LIQUIDS, ES-
PECIALLY GASOLINE, IN THE VICINITY OF
THE FURNACE.

7
Locating the Furnace
1. The furnace should be located in the
same room as the central system
and as close as possible, but not
closer than 9". There should be no
wall between the furnace and the
warm air outlet duct that is connected
directly to the warm air outlet plenum
of the central furnace. (See Fig. 2)
The unit will require installation with
the following clearances:
Unit to sidewall...............12"(305mm)
Unit to backwall............30"(760mm)
Chimney connector pipe to sidewall
.....................................21"(530mm)
Chimney connector pipe to backwall
.....................................18"(460mm)
Hot air ducts to combustibles
.......................................6"(150mm)
(Refer to Fig. 2 & 3)
Place the furnace on a noncombus-
tible floor.
Check figures 2 and 3. Be sure you
have the clearances shown from the
furnace and the connector pipe to
combustible surfaces. If you have a
solid brick or stone wall behind your
furnace, you can place the furnace
as close as you wish to the wall. If the
wall is only faced with brick or stone,
treat it as a combustible wall.
2.
3.
4.
18"
18"
6" SOLID DAMPER
6" BAROMETRIC
DRAFT REGULATOR
(OPTIONAL)
NON-COMBUSTIBLE FLOOR
12" 9"
48"
18"
CENTRAL
FURNACE
6" CHIMNEY
Figure 2
Figure 3

8
10'
2' MIN.
3' MIN.
6" CHIMNEY CONNECTOR
6" ELBOW
6" SOLID DAMPER
6" BAROMETRIC
DRAFT REGULATOR
(OPTIONAL)
REFER TO CHIMNEY
MANUFACTURER'S
INSTRUCTIONS AND
PARTS.
Chimney Connection
Fig. 4
MASONRY CHIMNEY
Before using an existing masonry chimney, clean the chimney and inspect the flue liner to be sure
it is safe to use. Make repairs before attaching the furnace. See page 4, item 5. Look at Fig. 4.
The connector pipe and fittings you will need to connect directly to a masonry chimney are shown.
The chimney connection should be as short as possible.
If the connector pipe must go through a combustible wall before entering the masonry chimney,
consult a qualified mason or chimney dealer. The installation must conform to local fire codes, and
N.F.P.A. 211.
DO NOT CONNECT THIS FURNACE TO A CHIMNEY FLUE SERVING ANOTHER APPLI-
ANCE.
The chimney used for a furnace must not be used to ventilate the cellar or basement. If there is
a cleanout opening at the base of the chimney, close it tightly.
Fig. 5
LISTED FACTORY BUILT CHIMNEY
Carefully follow chimney manufacturer's instructions. Use only a Listed Residential Type or
Building Heating Appliance Chimney. If your chimney starts at the ceiling (Fig. 5), you will need
enough 6" pipe to reach the ceiling.
The top of the chimney must be at least 3 feet above the roof and be at least 2 feet higher than any
point of the roof within 10 feet (Fig. 5).
6" SOLID DAMPER
6" BAROMETRIC
DRAFT REGULATOR
(OPTIONAL)
THIMBLE
6" ELBOW
6" CHIMNEY
CONNECTOR
6" ELBOW
NON-COMBUSTIBLE
WALL

9
Rules for Connector
Pipe Installation
1. The crimped end of the chimney connector fits
inside the furnace flue collar. Install additional chim-
ney connectors and elbow with the CRIMPED END
TOWARD THE FURNACE. This will allow any
condensation in the flue to run back into the furnace.
Use 6" dia. steel pipe and elbows for connection to
chimney. Never use less than 24 gauge and al-
though blued steel is satisfactory, high temp painted
black is much more desirable.
2. Slope any horizontal pipe upward toward the
chimney at least 1/4 inch for each foot of horizontal
run.
3. You must have at least 18 inches of clearance
between any horizontal piping and the ceiling.
(See Fig. 3)
4. The chimney connector must not extend into the
chimney flue. (See Fig. 6)
5. Seal each chimney connector pipe joint with fur-
nace cement. Also seal the pipe at the chimney.
6. Use 3 sheet metal screws at each chimney pipe
joint to make the piping rigid.
7. The chimney connector may include a section for
a barometric draft regulator between the furnace and
the chimney (Fig. 4,5, &7). The barometric draft
regulator must be installed in the same room (same
pressure zone) as the furnace.
8. Install the barometric draft regulator strictly in
accordance with the instructions that are provided
with the barometric draft regulator.
9. A solid damper must be used in the chimney
connecting pipes between the flue collar and the
chimney. When used in conjunction with a baromet-
ric draft regulator, the solid damper must be placed
between the barometric and the chimney. (See Fig.
4,5,7)
Adjusting the Barometric Draft Regula-
tor
1. Drill a hole in the chimney connector within 18" of
the flue collar below the barometric draft regulator
just large enough for the tube of the manometer.
2. Build a fire after all chimney connections have
been made.
3. Use a manometer to measure the draft in the flue.
4. Adjust the Barometric Draft Regulator to obtain a
draft of 0.05 - 0.06" W.C. under stable fire conditions.
RIGHT WRONG WRONG
Fig. 6
6" SOLID DAMPER
6" BAROMETRIC
DRAFT REGULATOR
(OPTIONAL)
MEASURE FLUE
DRAFT HERE
NON-COMBUSTIBLE
INSTALLATION PER
NFPA 211
Fig. 7

10
Assembly of Furnace
Your furnace requires the following items
to be assembled or installed by the service
person:
Feed Door Pull Handle
Feed Door Locking Handle
Blowers and Blower Controls
Electrical Connections
Remove all parts from inside the furnace
and inspect for damage, including the
firebrick as some breakage could occur
during shipment.
Assemble the feed door pull handle as
shown in Figure 8. Install thermostat
assembly and cover (complete with
handle) as illustrated in Figure 8.
Align thermostat control knob with flat on
thermostat control shaft and press onto
shaft. (See Fig. 8)
Attach feed door locking handle as in
Figure 9 with screws and nuts provided.
Note: Slotted holes are for adjustment of
handle. Adjust handle until some pres-
sure is required to lock feed door during
firing sequence.
Install the thermodisc on rear of furnace
cabinet with the two screws provided.
Mount the conduit assembly from the junc-
tion box to the thermostat bracket. Crimp
the two female terminals to each of the
wire leads. Plug the wires to the
thermodisc. NOTE: It does not matter
which of the two wires plugs to which
terminal on the thermodisc.
Remove blowers from cartons. Remove
junction box cover. Attach clip nuts as in
Figure 10. Install blower(s) and gasket(s)
with 1/4"-20x3/4" bolts as shown.
Wire right side blower first (See wiring
diagram, Fig. 11) and replace cover on
junction box on blower.
Wire left blower same as above and re-
place cover.
Check operation of shaker grates with
grate handle before operating furnace.
1.
2.
3.
4.
5.
6.
7.
8.
9.
Fig. 10
Fig. 9
Fig. 8

11
Fig. 11
NOTE:
Wire leads from the distribution
blower are usually BOTH BLACK.
Makes no difference which leads from
the motors connects to the corre-
sponding leads coming out of the
conduit.

12
Power Failure Instructions
Operation after loss of power:
1. Remove filter if provided
2. Do not expect to keep home at normal tem-
peratures.
3. Do not load fuel above bottom of feed door.
Installation
Please see all methods of Installation in
Appendix at the rear of this booklet.
Pipe to combustible:
Sides: 21"
Back: 18"
The installation must be made only on a noncom-
bustible floor.
d) Install the smoke pipe connector to the
chimney with 26-gauge pipe and elbows (to be
purchased separately), maintaining the proper clear-
ances for the specific model. Seal the smoke pipe
in the chimney with furnace cement. (The chimney
connector shall be securely supported, and joints
fastened with sheet metal screws or rivets.)
e) Install 8" diameter heat pipe to plenum of the
central hot air furnace. Use 26-gauge pipe and
connectors (to be purchased separately). (See Fig.
15) If central air conditioning is installed in the
plenum, install heat pipe above the air conditioning
unit. Secure heat pipe connection with supports and
sheet metal screws.
f) Connect electrical supply in the electrical
junction box that is mounted on the back of the
Furnace. See Wiring Diagram (Fig. 11). Remove
the cover from electrical junction box and connect
power supply wires to wires designated, using wire
nuts. The power cord supplied may be used for
installation, if permitted by local codes and regula-
tions. If the power cord supplied cannot be used, the
power supply wiring must be 90 degrees centigrade
in a metal cable and should be completed by a
qualified installer complying with NFPA Standard
No. 70 and local codes.
This is a furnace, not a free standing stove.
You must direct heated air from 8" outlets away from
the furnace, or it will not function properly.
1. This installation must be done by a qualified
heating equipment installer.
2. The installation is to be done in compliance with
National Fire Protection Association installation stan-
dards: No. 89M, 90B, 211, 70 (National Electrical
Code) and Uniform Mechanical Code 913, 6-4, in the
states where applicable. (Their code offers con-
necting smoke pipe connectors into chimney with
other fuel burning appliances.)
3. Rooms large in comparison with size of the
appliance:
a)Wood or Coal Burning Furnace needs air for
combustion and circulation to house.
b) Provision must be made to make up this air
and not starve gas or oil furnace of combustion air.
c) Have "Authority Having Jurisdiction" deter-
mine that air is of adequate makeup. (Reference
N.F.P.A. Nos. 30&54, Code for Installation of Gas &
Oil Equipment).
4. Have "Authority Having Jurisdiction" is to inspect
all chimneys and installations for adequate venting
and for compliance with standard and local codes
and regulations regarding installation of wood burn-
ing appliances.
5. Installation for Supplemental Heat Application to
Existing Central System. (See Fig. 2 for typical
installation.)
a) Place Wood or Coal Burning Furnace so that
the chimney connector will be as short as practical
and avoiding unnecessary sharp turns in the smoke
pipe connector and the installation of devices that
would create excessive resistance to the flow of flue
gases.
b) Locate the Wood or Coal Burning Furnace as
close as practical to the existing central hot air
heating system, maintaining clearances as stated
on the label on the fuel door.
c) Clearance from combustible materials must
comply with those stated on the label on the fire
door: Unit to combustible:
Front: 48"
Back: 30"
Sides: 12"
Plenum to Ceiling: 6"

13
2" MIN. AIR SPACE
REQUIRED BY CODE
18" MIN.
CENTRAL
FURNACE
PLENUM
TO
CEILING
6" MIN.
Figure 12
Operating Instructions
FUEL, Models 1500 & 1537G
Egg size (1-3/16" or larger) bituminous coal for residential furnaces, or any of the specially packed fireplace
coals can be used. Coal with a low ash content (2% to 6%) is recommended.
Hardwood, 18" to 26" should be split and air dried (seasoned) for 6 months.
LIGHTING
1.
2.
3.
4.
5.
Set the thermostat on "HIGH" for maximum draft.
Open the feed door and place paper and kindling on the grate for starting the fire.
Light the fire and close the feed door.
Add wood or about 15 lbs. of coal (depending on which model) after fire is burning briskly. Set thermostat
for desired temperature.
"MEDIUM" setting is normally satisfactory. Set higher or lower for your comfort.
ADDING FUEL
When starting a fire, add small amounts of fuel instead of adding large quantities of fuel. This will give more
complete combustion and less build-up of tars or soot in the chimney.
Set thermostat to HIGH before opening feed door.
Wood fire: Add wood to a convenient level.
Coal Fire:
Never smother the fire when adding coal (See Caution). Gas accumulation and a mild smoky explosion
will occur. Add fresh kindling if the bed of coals has cooled.
Add up to 20 lbs. of coal per loading. Never add coal above the bottom of feed door opening.
Stir the coal and watch the fire. Be sure the new coal is burning briskly before you close the doors and
turn the thermostat down.
Shake grates vigorously 1/2" left to right to spill ashes into the ash pan. Do this at least once every 12
hours of operation. Empty ash pan regularly. Do not allow ashes to build-up to grate as grate will warp
and burnout, and you might spill the ashes when removing the pan. Dispose of hot ashes properly (See
note 12 on page 4).
Rotation of the handle (5 o'clock to 7 o'clock) position will agitate coals and spill ashes into ash pan.
It is advisable for you to get familiar with the shaker grate operation before firing.
1.
2.
3.
a.
b.
c.
d.
e.
f.

14
Service Hints
Do not expect a furnace to draw. It is the
chimney that creates the draft. Smoke spillage
into the house or excessive build-up of water or
creosote in the chimney are warnings that the
chimney is not functioning properly. Correct the
problem before using furnace. Possible causes
are:
1. The connector pipe may be pushed into the
chimney too far, stopping the draft (Fig. 6)
2. Do not connect two furnaces or a stove and
furnace into the same chimney flue.
3. The chimney used for a furnace must not be
used to ventilate the cellar or basement. If
there is a cleanout opening at the base of
the chimney, it must be closed tightly.
4. If the chimney is operating too cool, water
will condense in the chimney and run back
into the furnace. Creosote formation will be
rapid and may block the chimney. Operate
the furnace at a high enough fire to keep the
chimney warm, preventing this condensa-
tion.
If the fire burns well, but sometimes smokes
or burns slowly, it may be caused by the
chimney top being lower than another part of
the house or a nearby tree. The wind blow-
ing over a house or a tree, falls on top of the
chimney like water over a dam, beating
down the smoke. The top of the chimney
should be at least 3 feet above the roof and
be at least 2 feet higher than any point of the
roof within 10 feet (Fig. 5).
See page 24 for list of trouble shooting tips.
5.
6.
A draft reading of .05 to .06 w.c. is suggested for proper burning of this unit when using
wood or bituminous coal as fuel. When using anthracite coal, this draft reading is a
minimum reading.
Chimney Maintenance
Creosote and Soot - Formation and Need for Removal
When wood is burned slowly, it produces tar
and other organic vapors, which combine with
expelled moisture to form creosote. The creo-
sote vapors condense in the relatively cool
chimney flue of a slow-burning fire. As a result,
creosote residue accumulates on the flue lin-
ing. When ignited, this creosote makes an
extremely hot fire.
When coal is burned, the products of combus-
tion combine with moisture to form a soot resi-
due which accumulates on the flue lining. When
ignited, this soot makes an extremely hot fire.
The chimney should be inspected at least twice
monthly during the heating season to determine
if a creosote or soot build up has occurred.
If creosote or soot has accumulated, it should
be removed to reduce the risk of a chimney fire.
Chimney fires burn very hot. If the chimney
catches fire, immediately call the fire depart-
ment, then reduce the fire by closing the inlet air
control. Pour a large quantity of coarse salt,
baking soda or cool ashes on top of the fire in
the firebox.
CAUTION
A chimney fire may cause ignition of
wall studs or rafters which you thought
were a safe distance from the chimney.
If you have a chimney fire, have your
chimney inspected by a qualified per-
son before using again.

15
26
27
28
29
30
31
32
33
343536
37
Model 1500 & 1537G
Repair parts

16
KEY PART # DESCRIPTION QTY.
1 69509 Firebox Weldment 1
2 25467R Cabinet Side (Left & Right) (Color - Red) 2
** 25467G Cabinet Side (Left & Right) (Color - Green) 2
3 88032 Flue Collar Gasket 1
4 40246 Flue Collar 1
5 23459 Cabinet Back (Color - Red) 1
** 23459G Cabinet Back (Color - Green) 1
6 25466R Cabinet Top (Color - Red) 1
** 25466G Cabinet Top (Color - Green) 1
7 40258 Rear Liner 1
8 40269 Front Liner 1
9 23398 Baffle 1
10 40256 Shaker Grate Frame 2
11 40257 Shaker Grate 2
12 40260 Shaker Handle 1
13 23800 Smoke Curtain 1
14 83445 1/4-20 x 1-1/4 Carriage Bolt 2
15 23787 Smoke Curtain Clip 2
16 83250 1/4-20 Kep Nut 2
17 68218 Ash Door Assembly (Includes Door and Gasket) 1
18 23859B Draft Cap (Painted) 1
19 89354 Ash Door Handle 1
** 891098 Ash Door Handle 1
20** 89574 Spring Handle 1
21 ***** Handle Bushing (Included with Handle) 1
22 23445 Door Latch 1
23 83461 Handle Washer 1
24 83178 3/8-16 Jamb Nut 1
25 22662 Feed Door Hinge Bracket 1
26 89308 Feed Door Handle Assembly 1
** 891097 Feed Door Handle Assembly 1
27** 89574 Spring Handle 1
28 89319 Blower Gasket 2
29 80230 Blower Assembly 2
30** 80314 Thermodisc 60T12 1
N/S 80145 Limit Control 1
31 68234 Blower Thermostat Bracket 1
32 22761 Flue Collar Ring 1
33 22762 Forced Draft Ring 1
34 22140 Relay Box Bracket 1
35 80131 Junction Box (4 x 4) 1
36 80231 Junction Box Cover 1
37 89066 Firebrick (4-1/2W x 9L x 1-1/4H) 12
38 68228 Ash Pan Weldment 1
N/S 68231 Fan Control Cord Assembly 3
PARTS LIST - 1500/1537G
** = PARTS USED ON 1537G ONLY - CABINET PARTS ARE GREEN IN COLOR
N/S = NOT SHOWN

17
1
2
10
11
9
7
12
5
4
6
8
3
7
13
KEY PART # DESCRIPTION QTY.
- 68733 Thermostat Box Assembly (Color - Red) -
** 68733G Thermostat Box Assembly (Color - Green -
1 68722 Thermostat Panel Weldment 1
2 68732 Thermostat Cover Weldment (Color - Red) 1
** 68732G Thermostat Cover Weldment (Color - Green) 1
3 23429 Thermostat Step Plate 1
4 23431 Friction Plate 1
5 81903 Thermostat 1
6 23427 Thermostat Mounting Bracket 1
7 83172 #10 Sheet Metal Screw 6
8 89041 Spring 1
9 89175 Thermostat Knob 1
10 23425 Handle Bracket 2
11 89520 Wooden Handle 1
12 86318 Thermostat Chain .542 FT
13 68217 Feed Door Assembly (Includes Door and Gasket) 1
N/S 83106S Machine Screw, 10-24 x 1/2" SL HD Z 2
N/S 83136 Washer, 9/32" I.D. - 5/8" O.D. - 1/16" THK. 1
N/S 83816 Cotter Pin, 1/16" x 3/4" 1
** = PARTS USED ON 1537G - PARTS ARE GREEN IN COLOR
N/S = NOT SHOWN
Thermostat Box Assembly

18

19
COLD AIR
RETURN
TO EXISTING
DUCT WORK
WARM AIR
EXISTING
FURNACE
SOLID FUEL
FURNACE
FILTER BOX
APPENDIX
INSTALLATION A

20
INSTALLATION B
INSTALLATION C
COLD AIR
RETURN
TO EXISTING
DUCT WORK
WARM AIR
EXISTING
FURNACE
SOLID FUEL
FURNACE
FILTER BOX
PLENUM
COLLECTOR BOX
COLD AIR
RETURN
TO EXISTING
DUCT WORK
WARM AIR
EXISTING
FURNACE
SOLID FUEL
FURNACE
FILTER BOX
PLENUM ELBOW
PLENUM TOP
(OPTIONAL)