Vermont Castings | The Aspen 1920 | Specifications | Vermont Castings The Aspen 1920 Specifications

Vermont Castings The Aspen 1920 Specifications
The Aspen®
Woodburning Stove
Model 1920
and Operating
For use in the
United States and Canada
Safety Notice: If this appliance is not properly installed, operated and maintained, a house fire may result.
To reduce the risk 3069
of fire, follow the installation instructions. Failure to
follow instructions
result in property damage, bodily injury or even
death. Contact local building officials about restrictions and installation
inspection requirements in your area.
Do Not Discard This Manual: Retain for Future Use
30000369 9/10 Rev. 21
Aspen® Woodburning Stove
Thank you for choosing a Vermont Castings Aspen to meet your heating needs. We’re confident you will find the
Aspen to be an effective wood-burning heater incorporating modern, non-catalytic combustion technology with the
classic aesthetic appeal of its Vermont Castings lineage.
The Aspen achieves high-efficiency through precisely calibrated delivery of primary and secondary air into a refractory-insulated firebox. Properly operated and maintained according to the guidelines in this manual, your Aspen will
provide safe, dependable, and economical heating for years to come.
The Aspen Model 1920 is listed by OMNI-Test Laboratories of Portland, Oregon. The test standards are ANSI/UL1482 for the United States and ULC S627 for Canada.
The Aspen Model 1920 is listed for burning wood fuel only. Do not burn other fuels.
The Aspen Model 1920 is approved for installation in manufactured (mobile) homes in the United States only using
the optional Mobile Home Kit #1898 in accordance with the instructions in that kit and any local codes.
The Aspen Model 1920 complies with the standards set forth by the Federal Environmental Protection Agency, 40
CFR Part 60.532(b)(2), as stated on the permanent label attached to each stove.
We recommend that you hire a professional, solid-fuel stove technician to install your Aspen, or to advise you on the
installation should you attempt to install it yourself. Consult the authority having local jurisdiction (such as a municipal building department, fire department, fire prevention bureau, etc.) before installation to determine the need for a
building permit. Also, consult your insurance agent to be sure your installation complies with specific requirements that
may vary locally.
In addition to directions on installation and operation, this manual includes directions on maintenance and assembly.
Please read this entire manual before you install or operate your new room heater.
Save These Instructions For Future Reference.
Table of Contents
Installation Requirements.................... 4
Assembly ............................................15
Appendix - Draft Management............ 24
Replacement Parts..............................27
Proposition 65 WARNING: Fuels used in gas,
woodburning or oil fired appliances, and the products of combustion of such fuels, contain chemicals
known to the State of California to cause cancer,
birth defects and other reproductive harm.
California Health & Safety Code Sec. 25249.6
Aspen® Woodburning Stove
Aspen, Model 1920
EPA Emissions rating................ 4.3 (g/h, non-catalytic)*
Maximum heat output...........................18,000 Btu’s/hr.1
Area heated........................ Up to 600 sq. ft. (56 sq. m)2
Fuel size/type....................................... 16” (41 cm) logs
Chimney connector..................... 6” (152 mm) diameter
Chimney flue size........................6” (152 mm) minimum
Flue exit position........................ Reversible, top or rear
Primary air.... Manually set, thermostatically maintained
Ash handling system...................... Removable ash pan
Glass panel.......................... High-temperature ceramic
Weight................................................. 240 lbs. (110 kg)
Width (Left leg - Right leg)........................ 16” (406 mm)
Depth (Front leg - Rear leg)..................... 23” (584 mm)
Height to top of top exit flue collar............ 24” (610 mm)
Height to top of rear exit flue collar........... 21” (533 mm)
This value can vary depending on how the stove is operated, the type and moisture content of the fuel used,
as well as the design, construction and climatic location
of your home. Figures shown are based on maximum
fuel consumption obtained under laboratory conditions
and on average efficiencies.
These values are based on operation in building codeconforming homes under typical winter climate conditions in New England. If your home is of nonstandard
construction (e.g., unusually well insulated, not insulated, built under ground, etc.) or if you live in a more
severe or more temperate climate, these figures may
not apply. Since so many variables affect performance,
consult your Vermont Castings authorized dealer to
determine realistic expectations for your home.
(191 mm)
(152 mm)
(381 mm)
(565 mm)
(610 mm)
Top Exit
Flue Collar
(570 mm)
(457 mm)
(184 mm)
(406 mm)
(584 mm)
Fig. 1 Aspen 1920 specifications.
Aspen Specs
Aspen® Woodburning Stove
Before you begin an installation, review your plans to
be certain that:
• Your stove and chimney connector will be far enough
from combustible material to meet all clearance
• The floor protector is large enough and is constructed
properly to meet all requirements.
• You have all necessary permits from local authorities.
Your local building official is the final authority for approving your installation as safe and determining that it
meets local and state codes.
The metal label permanently attached to the back of
the stove indicates that the Aspen has been tested
to current UL and ULC standards by Intertek Testing
Services of Middleton, Wisconsin. Clearance and installation information is also printed on the label. Local authorities generally will accept the label as evidence that,
when the stove is installed according to the information
on the label and in this manual, the installation meets
codes and can be approved. Codes, however, vary in
different areas. Before starting the installation, review
your plans with the local building authority. Your local
dealer can provide any additional information needed.
For any unresolved questions about installation, refer
to the National Fire Protection Association’s publication ANSI/NFPA 211–1988 Standard for Chimneys,
Fireplaces, Vents and Solid Fuel Burning Appliances. In
Canada, the equivalent publication is CSA CAN-B365,
Installation Code for Solid Fuel Burning Appliances and
Equipment. These standards are the bases for many
national codes. They are nationally recognized and are
accepted by most local authorities. Your local dealer
or your local building official may have a copy of these
Important: Failure to follow these installation
instructions may result in a dangerous situation, including a chimney or house fire. Follow all instructions exactly and do not allow makeshift compromises to endanger property and personal safety.
Your stove must be connected either to a sound
masonry chimney that meets local codes, to a relined
masonry chimney that meets local codes, or to an
approved prefabricated metal chimney. Whichever of
those types you use, the chimney and chimney connector must be in good condition and kept clean.
If you use an existing masonry chimney, it must be
inspected to ensure safe condition before the stove is
installed. Your local professional chimney sweep, building inspector, or fire department official will be able to
make the inspection or direct you to someone who can.
The chimney should extend at least 3’ (914 mm) above
the highest point where it passes through a roof, and at
least 2’ (610 mm) higher than any portion of a building
within 10’ (3 m).
To assure proper draft and good performance, any
chimney used with this stove should extend at least 16’
(4.9 m) above the flue collar of the stove.
0 To 10’
2’ Min.
0 To 10’
2’ Min.
Reference Point
Fig. 2 The 2’-3’-10’ Chimney Rule.
2/11/98 must be inspected to conAn existing masonry chimney
firm that it has a lining. Do not use an unlined chimney.
The chimney also should be examined for cracks,
loose mortar, other signs of deterioration, and blockage.
Repair any defects before the chimney is used with
your stove.
A prefabricated doublewall insulated chimney
A tile-lined
Fig. 3 Standard Chimney Types
chimney types
12/13/99 djt
Aspen® Woodburning Stove
Masonry Chimneys, cont’d.
• Unused openings in an existing masonry chimney
must be sealed with masonry to the thickness of
the chimney wall, and the chimney liner should be
repaired. Openings sealed with pie plates or wallpaper are a hazard and should be sealed with mortar
or refractory cement. In the event of a chimney
fire, flames and smoke may be forced out of these
unused thimbles.
• The chimney should be thoroughly cleaned before
• A newly-built masonry chimney must conform to the
standards of local building code, or, in the absence
of a local code, to a recognized national code. Masonry chimneys must be lined, either with code-approved masonry or precast refractory tiles, stainless
steel pipe, or a code-approved, “poured-in-place”
liner. The chimney clean-out door must seal tightly to
ensure a good draft.
Prefabricated Chimneys
A prefabricated metal chimney must be one that is tested and listed for use with solid-fuel burning appliances
to the High-Temperature (H.T.) Chimney Standard
UL-103-1985 (2100°F.) for the United States, and High
Temperature (650°C) Standard ULC S-629 for Canada.
Chimney Size
This stove is approved for venting into a masonry chimney with a nominal flue size of 8” x 8” (203 x 203 mm),
and into a round flue size of 8” (203 mm) or 6” (152
It may be vented into larger chimneys as well. However,
chimneys with liners larger than 8” x 12” (203 x 305 mm)
may experience rapid cooling of smoke and reduction
in draft, especially if they are located outside the home.
Such large chimneys may need to be insulated or have
the flue relined for proper stove performance.
Do not connect this unit to a chimney flue serving another appliance.
Note: Do not vent this stove into a factory-built
(zero-clearance) fireplace. This stove has not
been tested and listed for that type of installation. Factory-built fireplaces and their chimneys
are specifically designed as a unit for use as
fireplaces. It may void the listing or be hazardous to adapt them for any other use.
Do not connect the STOVE to any air distribution duct or system.
Ask your dealer about components available for connecting the stove to a steel chimney liner.
Chimney Connector Guidelines
A chimney connector is the double-wall or single-wall
pipe that connects the stove to the chimney. The chimney itself is a masonry or prefabricated structure that
encloses the flue. Chimney connectors are used only
to make the connection from the stove to the chimney.
They are for interior use only.
Double-wall connectors must be tested and listed for
use with solid-fuel burning appliances. Single-wall connectors should be made of 24 gauge or heavier steel,
and should be 6” (152mm) in diameter. Do not use
galvanized chimney connector; it cannot withstand the
high temperatures that can be reached by smoke and
exhaust gases, and may release toxic fumes under high
If possible, do not pass
the chimney connector
through a combustible wall or ceiling. If
passage through a
combustible wall is
unavoidable, refer to
Flue gas
the recommendations
in the section following on Wall Passthroughs. Do not pass
the connector through
Fig. 4 Chimney connector.
an attic, a closet or
any similar concealed
Chimney connector
12/13/99 djt
space. The whole chimney connector
should be exposed and accessible for inspection and cleaning.
Install the single wall chimney connector not less than
18” (457mm) from the ceiling. Keep it as short and
direct as possible, with no more than two 90 degree
turns. If possible, use 45° elbows. Slope horizontal
runs of connectors upward 1/4” per foot (20mm per
meter) going from the stove toward the chimney. The
recommended maximum length of a horizontal run is
3’ (914mm), and the total length of chimney connector
should be no longer than 8’ (2.5 meters).
In cathedral ceiling installations, extend the prefabricated chimney downward to within 8 feet (2.4m) of the
SAFETY NOTE: Always wear gloves and protective
eyewear when drilling, cutting or joining chimney
connector sections .
Aspen® Woodburning Stove
Double-wall Chimney Connectors
The Aspen is approved for installation in the U.S. and
Canada with double-wall chimney connectors that have
been tested and listed for use with solid-fuel burning
appliances by a recognized testing laboratory.
Follow the instructions for assembling and installing
double-wall connectors provided by the manufacturer of
the double-wall chimney. To ease assembly and help
assure safety, use chimney components manufactured
by a single source.
NOTE: For installations using double-wall connectors, minimum clearances must conform to those
listed in the clearance chart on Page 13.
Single-wall Chimney Connectors
• Beginning at the flue collar of the stove, assemble
the chimney connector. Insert the first crimped end
into the stove’s flue collar, and keep each crimped
end pointing toward the stove. Using the holes in the
flue collar as guides, drill 1/8” (3 mm) holes in the
bottom of the first section of chimney connector and
secure it to the flue collar with three #10 x 1/2” sheet
metal screws.
Secure each joint between sections of chimney
connector, including telescoping joints, with at least
three sheet metal screws. The predrilled holes in
the top of each section of chimney connector serve
as guides when you drill 1/8” (3mm) holes in the bottom of the next section.
Secure the chimney connector to the chimney. Instructions for various installations follow.
Be sure the installed stove and chimney connector
are correct distances from nearby combustible material.
Note: Special slip pipes and thimble sleeves that form
telescoping joints between sections of chimney connector are available to simplify assembly. Slip pipes
eliminate the need to cut individual connector sections.
Consult your local dealer about these special connector
Securing the Single-wall Connector to a
Prefabricated Chimney
Follow the installation instructions of the chimney
manufacturer exactly.
Thimble Sleeve
Keep sleeve
end flush with
flue tile
Fig. 6 The thimble, made of either ceramic or metal, must be
cemented securely in place.
The adapter forms a union between the chimney and
chimney connector that ensures any soot or creosote
falling from the inner
of the chimney will stay
thinble walls
inside the chimney12/13/99
Securing the Single-wall Connector
to a Masonry Chimney
The Aspen may be connected to either a freestanding
masonry chimney or to a fireplace masonry chimney.
Freestanding Installations
If the chimney connector must pass through a combustible wall to reach the chimney, follow the recommendations for Wall Pass-Through construction on pages 7-8.
The opening through the chimney wall to the flue - the
“breech” – must be lined with a ceramic or metal
thimble which is securely cemented in place.
A metal pipe section called the “thimble sleeve,” slightly
smaller in diameter than standard connector and the
thimbles, will allow the removal of the chimney connector system for inspection and cleaning. Thimble
sleeves are available from your local dealer.
To install a thimble sleeve, slide it into the breech until
it is flush with the inner flue wall. Be sure that it does
not extend into the flue passage where it could interfere
with the draft.
The thimble sleeve should protrude 1-2” (25-50 mm)
into the room. Use furnace cement and thin gasketing
to seal the sleeve in place in the thimble. Secure the
chimney connector to the outer end of the sleeve with
sheet metal screws.
Special adapters are available from your local dealer to
make the connection between the prefabricated chimney and the chimney connector. The top of such adapters attach directly to the chimney or to the chimney’s
ceiling support package. The bottom of the adapter is
secured to the chimney connector.
Aspen® Woodburning Stove
Connection Above the Fireplace
In this installation, the chimney connector enters the
fireplace flue though a thimble located above the fireplace. The liner of the fireplace chimney should extend
at least to the point at which the chimney connector
enters the chimney. Follow all the guidelines for installing a chimney connector into a freestanding masonry
chimney, and pay special attention to these additional
• Check the stove and chimney connector clearances
to combustible mantel and trim materials. If necessary, use a combination of mantel, trim, and connector heat shields to provide the required clearances.
• Double-check connector clearance to the ceiling.
• The fireplace damper must be closed and sealed to
prevent room air from being drawn up the flue which
could reduce performance. However, it must be
possible to reopen the damper to inspect or clean
the chimney.
Chimney Connector
Heat Shield
* Note
requirement on
Pages 13-14
Connection Through the Fireplace
If your fireplace opening height is at least 21¹⁄₂" (546
mm), you may install a stove through the opening using a “positive connection” kit available from your local
dealer. These kits provide a secure connection between the stove flue collar and the chimney flue.
Confirm that the stove location is within the required
clearance specifications for the mantel and surrounding
fireplace trim. Refer to Page 12.
Floor protection requirements also apply to fireplace
installations. Refer to Page 9.
Fig. 7 If the clearance between the chimney connector and
either the ceiling or the mantel is inadequate, a protective
heat shield is required. ST244
fplc over mantel
required clearance.
* Maintain
See Page 13.
Wall Pass-throughs
Whenever possible, design the installation so that the
connector does not pass through a combustible wall.
If you must include a wall pass-through in your installation, check with your building inspector before you
begin. Also check with the chimney connector manufacturer for any specific requirements.
Flex Connector
Consult with your dealer regarding special connection
components available for use as wall pass-throughs.
Use only parts that have been tested and listed for use
as a wall pass-through.
Min. 15”
Adapter w/
Clean-out Tee
*18” (46016”US
Fig. 8 Special adapter kits are available from your local
dealer to simplify fireplace ST245
flex connector
Aspen® Woodburning Stove
U.S. Requirements:
Solid insulated,
listed factorybuilt chimney
length set flush
with flue
Min. 9”
Min. 9”
Figure 9 shows one NFPA-approved method. All combustible material in the wall is cut away to provide 12”
(305 mm) clearance to the connector. Brick and mortar
are used to enclose the clearance area.
constructed to
NFPA 211
In Canada, this type of installation must conform to
CAN/CSA-B365, Installation Code for Solid Fuel Burning Appliances and Equipment.
Fire clay liner
Fig. 10 Wall Pass-through using factory-built insulated
chimney section.
2” (51mm) Min.
Steel Thimble
factory built insulated
with two 1”
(25mm) Ventilated chimney section
Min. 6”
Masonry Chimney constructed to NFPA 211
24 ga.Sheet
Steel Supports
Fig. 11 Wall Pass-through using single wall chimney
connector with a ventilated steel thimble.
Chimney clearance to sheet steel
supports and combustibles
2” (51mm)
2” (51mm) Min.
air space single wall
2” (51mm) Min.
w/ventilated thimble
Prefab Chimney
Chimney Connector
24 ga. Sheet
Steel Supports
24 ga. Sheet
Steel Supports
Masonry Chimney constructed to NFPA 211
wall with
steel thimble
Chimney clearance to sheet steel
supports and combustibles
2” (51mm)
Min. 18”
Chimney Flue
Chimney Flue
Glass Fiber
Min. 12”
(305 mm)
Fire clay
A = Minimum 12” (305 mm) brick construction between liner and combustible
framing materials
Fig. 9 Masonry Wall Pass-through with single wall
chimney connector.
masonry wall pass through
w/ single wall
Chimney Connector
Fig. 12 Wall Pass-through with ventilated steel thimble.
Min. 2” (51mm) Chimney clearance to brick and combustibles
to NFPA 211
Chimney Flue
Chimney clearance to sheet steel
supports and combustibles
Min. 18”
24 ga.Sheet
Steel Supports
Non-soluble refractory cement
Sheet Steel
Canadian Requirements:
In Canada, the Canadian Standards Association has
established specific guidelines regarding wall passthough design. Figure 13 shows one approved method
in which all combustible material in the wall is cut away
to provide the required 18” (457 mm) clearance around
the connector. The resulting space must remain empty.
A flush-mounted sheet metal cover may be used on one
side only. If covers must be used on both sides, each
cover must be mounted on noncombustible spacers at
least 1” (25 mm) clear of the wall. Your local dealer or
your local building inspector can provide details of other
approved methods of passing a chimney connector
through a combustible wall.
Air Space
Chimney Flue
Alternate methods approved by the NFPA:
• Using a section of double-wall chimney with a 9”
(229 mm) clearance to combustibles. (Fig. 10)
• Placing a chimney connector pipe inside a steel
double-wall ventilated thimble, which is then separated from combustibles by 6” (152 mm) of fiberglass
insulating material. (Fig. 11)
• Placing a chimney connector pipe inside a section of
9” (229 mm) diameter, solid-insulated, factory-built
chimney, with two inches of air space between the
chimney section and combustibles. (Fig. 12)
Min. 2”
Chimney Flue
The National Fire Protection Association (NFPA) has
established guidelines for use in the United States for
passing chimney connectors through combustible walls.
Many building code inspectors follow these guidelines.
24 ga. Sheet
Steel Support
(one side only)
24 ga.Sheet
Steel Support
Masonry Chimney constructed
to CAN/CSA-B365
Fig. 13 CSA approved Wall Pass-through.
CSA approved wall
Aspen® Woodburning Stove
Floor Protection
Floor Protection Requirements
A tremendous amount of heat radiates from the bottom
plate of your Aspen. The floor area directly under and
around the stove will require protection from radiant
heat as well as from stray sparks or embers that may
escape the firebox.
Most installations will require that the bottom heat
shield be attached. Only when the stove is placed on a
completely noncombustible surface such as unpainted
concrete over earth may it be used without the heat
Even when the bottom heat shield is installed, you must
provide special protection to the floor beneath. For
installations with the heat shield attached, use a noncombustible floor protector such as 1/4” nonasbestos
mineral board or equivalent, or 24 gauge sheet metal.
The floor protector may be covered with a noncombustible decorative material if desired. Do not obstruct the
space under the heater.
Heat protection is provided through the use of a Bottom Heat Shield #1895. Spark and ember protection
must be provided by a floor protector constructed with
noncombustible material as specified.
U. S.
A: 6”
8“ (203 mm)
B: 16”
18” (457 mm)
C: 10”
(254 mm)
floor protection
D: 44”
(1219 mm)
E: 27”
31” (787 mm)
Fig. 14 These dimensions are minimum requirements only.
Use greater dimensions whenever possible.
Protection requirements vary somewhat between the
United States and Canada as follows:
U.S. Installations: The floor protector is required under
the stove and must extend at least 16” from the front of
the stove (B, Fig. 14), and at least 6” from the sides and
rear (A, Fig. 14). It must also extend under the chimney
connector and 2” to either side. (C, Fig. 14)
In Canada: A noncombustible floor protector is required
under the heater. The floor protector must extend 18”
(457 mm) to the front (B, Fig. 14) and 8” (203 mm) from
the sides and rear. (A, Fig. 14)
Fireplace Hearth Protection
Do not assume that your fireplace hearth is completely
noncombustible. Many fireplace hearths do not satisfy
the “completely noncombustible” requirement because
the brick or concrete in front of the fireplace opening
is supported by heavy wood framing. Because heat
is readily conducted by brick or concrete, it can easily
pass through to the wood. As a result, such fireplace
hearths can be a fire hazard and are considered a combustible floor.
For all fireplace installations, follow the floor protection
guidelines described above.
Keep in mind that many raised hearths will extend
less than the required clearance from the front of the
heater when it is installed. In such cases, sufficient
floor protection as described above must be added in
front of the hearth to satisfy the minimum floor protector
Wood framing
requires protection
from radiant heat
Fig. 15 Supporting timbers under fireplace hearths are
considered to be combustible.
requirement from the front of the stove: 16” (406 mm)
from the front in the United
States and 18” (457 mm)
from the front in Canada.Rear exit floor dgrm
Hearth rugs do not satisfy
the requirements
for floor
protection as they are only fire-retardant, not fire proof.
Fireplace installations also have special clearance
requirements to the side walls, side decorative trim and
fireplace mantel. Refer to the information on fireplace
and mantel trim shields in this section.
Aspen® Woodburning Stove
Mobile Home Installation
The Aspen is approved for use in manufactured (mobile) homes when installed with the optional Mobile
Home Kit #1898 in accordance with the instructions
provided with that kit and any local codes. This approval applies only in the United States.
In addition to the standard installation requirements
described in this manual, the following guidelines apply
to mobile home installations:
1. The stove must be permanently secured to the floor
using the leg clamps and fasteners provided in the
2. The stove must have a permanent connection to the
outside to supply combustion air.
3. The stove must be grounded to the steel chassis of
the mobile home.
4. A listed chimney system, including roof thimble,
spark arrestor, chimney supports, roof flashing and
any other components suitable for use in mobile
homes must be used. The chimney system must
comply with the standard for Chimneys Factory-Built
Residential Type and Building Heating Appliances
UL 103.
5. The chimney must be attached directly to the stove
and must extend at least 3’ (914mm( above the part
of the roof through which it passes. The top of the
chimney must extend at least 2’ (610 mm) above the
highest point of any part of the mobile home structure within 10’ (3 m) of the chimney.
6. If the chimney exits the mobile home through a wall at
a point 7 feet or less above the ground level on which
the mobile home is located, a guard or other noncombustible enclosure must be fitted at the point of exit
and extend up to a height of 7’ (2.1 m). Any openings
in this guard must be smaller than 3/4” (19 mm).
7. Check all local building codes, specifically those
related to mobile homes. Other requirements may
be applicable to chimney system removal for transportation of the mobile home.
Warning: Do not install the Aspen in a sleeping
room or hallway.
Caution: The structural integrity of the mobile
home roof, floor, walls and ceiling must be maintained.
Clearance to Surrounding
Combustible Materials
When the stove is operating, both the stoveplate and
the chimney connector radiate heat in all directions. A
safe installation requires that adequate clearance be
maintained between the stove and nearby combustible
materials to ensure that those materials do not overheat.
Clearance is the distance between either your stove
or chimney connector, and nearby walls, floors, the
ceiling, and any other fixed combustible surface. Keep
furnishings and other combustible materials away
from the stove as well. In general, a distance of 48”
(1219 mm) must be maintained between the stove and
moveable combustible items such as drying clothes,
furniture, newspapers, firewood, etc. Keep this area
empty of any combustible material.
Safe Ways to Reduce Clearances
The Aspen clearance requirements, listed and
diagramed on pages 10-11, have been established
through testing to UL and ULC standards to meet most
installation configurations. These involve four basic
• When the stove has no listed heat shield installed.
• When the stove does have a listed heat shield
mounted on it.
• When the wall has no listed heat shield installed.
• When the wall does have a listed heat shield
mounted on it.
In general, the greatest clearance is required when the
stove will be positioned with no heat shield near a wall
with no heat shield. The least clearance is required
when both the stove and the wall have heat shields.
Reducing a stove clearance may require installation of
a listed heat shield on the chimney connector as well.
Clearances may be reduced only by means approved
by the regulatory authority, or in accordance with the
clearances listed in this manual.
When determining clearance, always measure from
the top plate of the stove, or, from the chimney connector itself, to the adjacent combustible surface. Do not
measure from the heat shields of the stove or connector
to the combustible surface.
Aspen® Woodburning Stove
Wall Shields
Wall shields should be constructed of 24 gauge or
heavier sheet metal, or another noncombustible material such as 1/2” (13mm) insulation board or common
brick “laid on flat,” with the 3¹⁄₂" (90mm) side down.
Shields must be spaced out from the combustible surface 1" (25mm) on noncombustible spacers. The spacers should not be directly behind the stove or chimney
Air must be able to flow between the wall and the
shield. At least 50% of the bottom 1" (25mm) of the
shield should be open and the shield must be open at
the top.
Air flow
Fig. 17 Parallel installation, vertical chimney connector, two
wall shields.
parallel vertical wall shield
12/14/99 djt
Stud wall
Wall shield
Noncombustible spacers
and fasteners
Metal Spacer
Air flow
Fig. 16 Approved Wall shield construction
The following examples
of wall shield construction illusST248
trate common wall
to safely achieve reduced
12/14/99 djt wall materials.
clearances to combustible
Corner installation, vertical chimney connector, two
wall shields. Fig. 19: Reduced side clearances. Wall
shields MUST meet at corner.
Fig. 18 Parallel installation with rear wall pass-through, two
wall shields.
parallel rear wall
12/14/99 djt
Parallel installation, vertical chimney connector,
two wall shields. Fig. 17: Reduced clearances for
both rear and side walls. Wall shields may meet at
corner if desired. Shielding for connector is centered
behind connector.
Parallel installation with rear wall pass-through, two
wall shields. Fig. 18: Reduced clearances for both
rear and side walls. Wall shields may meet at corner
if desired. Shielding for connector is centered behind
connector. Wall pass-through must comply with codes.
Fig. 19 Corner installation, vertical chimney connector, two
wall shields.
corner install
12/14/99 djt
Aspen® Woodburning Stove
A = 9” (229 mm) Max.
B = 22¹⁄₂" (572 mm) Min.
A = 7¹⁄₂" (191 mm) Max.
B = 21” (533 mm) Min.
A = 6” (152 mm) Max.
B = 19¹⁄₂" (495 mm) Min.
A = 4¹⁄₂" (114 mm) Max.
B = 18” (457 mm) Min.
Max. 9”
A = 3” (76 mm) Max.
B = 16¹⁄₂" (419 mm) Min.
Min. 15”
A = 1¹⁄₂" (38 mm) Max.
B = 15” (381 mm) Min.
B: Mantel
C: Top Trim*
D: Side Trim
22¹⁄₂" (572 mm)
12” (305 mm)
8” (203 mm)
* material is lessaspen
than 1¹⁄₂" (38 mm) thick
trim clearances
12/15/99 djt
Fig. 20 Mantel and trim clearances.
mantel clrncs
12/14/99 djt
A fireplace installation requires special clearance between the side of the stove and the right and left walls,
the side of the stove and the decorative side trim on the
fireplace face, and the top of the stove and the mantel.
Fireplace Clearances
Maximum Mantel depth (A, Fig. 20) of a combustible
mantel is 9” (230 mm). At that depth, the clearance to
the stove top (B) must be a minimum of 22¹⁄₂" (572 mm).
Top Trim (C) protruding less than 1¹⁄₂" (38mm) from
the face of the fireplace must be a minimum of 12"
(305mm) from the stove top. This clearance may not be
reduced by shielding.
For every 1¹⁄₂" (38 mm) increment that the trim or mantel extends in depth, the clearance from the stove top
must also be increased by 1¹⁄₂" (38 mm).
Side Trim must have a minimum clearance of 8"
(203 mm), measured from the stove's top edge. (D, Fig.
alcove clearances
(NFPA 211)
158 cm
117 cm
122 cm
122 cm
92 cm
46 cm
Min. Width
Alcove Clearances
The Aspen is approved for installation into an alcove
constructed to maintain the clearances diagramed in
Figure 21.
Max. Depth
Ceiling Above
Fig. 21 Alcove Specifications.
Aspen® Woodburning Stove
Aspen Clearance Chart
Use the chart below together with the diagrams on the next page to determine the required clearance for your particular installation.
Stove clearances are measured from the top plate to the combustible surface.
Chimney connector clearances are measured from the connector surface and take into account flue collar offset.
Unprotected SurfacesProtected Surfaces
Parallel InstallationInstallationParallel InstallationInstallation
Stove Clearance
Side RearCorner
No Heat Shields
(A) 24”
(B) 13”
(C) 13”
(D) 16”
(E) 9”
(F) 8”
(610 mm)
(330 mm)
(330 mm)
(406 mm)
(230 mm) (203 mm)
Top Exit, Rear Heat
(G) 24”
(H) 11”
(I) 13”
(J) 16”
(K) 9”
(L) 8”
Shield ONLY1
(610 mm)
(179 mm)
(330 mm)
(406 mm)
(230 mm)
(203 mm)
Rear Exit, Rear Heat
(M) 24”
(N) 11”
(O) 16”
(P) 9”
Shield ONLY
(610 mm)
(179 mm)
(406 mm)
(230 mm)
Top Exit, Rear H.S., Single-
(Q) 24”
(R) 9”
(S) 13”
(T) 16”
(U) 9”
(V) 8”
wall, connector shields1,2
(610 mm)
(229 mm)
(330 mm)
(406 mm)
(230 mm)
(203 mm)
Top Exit, Rear H.S., Double-
(Q) 24”
(R) 7”
(S) 13”
(T) 16”
(U) 7”
(V) 8”
wall connector shields 1,3
(610 mm)
(178 mm)
(330 mm)
(406 mm)
(178 mm)
(203 mm)
Chimney ConnectorUnprotected Surface / VerticalProtected Surface / Vertical
No Heat Shields
15” (381 mm)
11” ( 279 mm)
Using Connector Heat Shields2
13” (330 mm)
6” (152 mm)
Double Wall Connector 6” (152 mm)
6” (152 mm)
Unprotected Surface / HorizontalProtected Surface / Horizontal
Single Wall Connector
18” (457 mm)
11” (279 mm)
Double Wall Connector
6” (152 mm)
6” (152 mm)
Front Clearance All Installations
to Combustibles
48” (1219 mm)
** A distance of 48” must be maintained between the stove and moveable combustible items such as drying clothes, furniture, firewood, etc.
When a rear heat shield is installed on a top exit stove, the shield insert must be attached to the shield so the area behind
the flue collar on the stove is protected.
Chimney connector heat shields must extend exactly 24” (610 mm) above the top of the stove. No shielding can be used on
the connector above 24” (610 mm). The unshielded chimney connector above the 24” (610 mm) point must be 13” (330 mm)
from an unprotected wall.
In top exit installations, this clearance requires the use of the rear stove heat shield with the flue collar cover plate installed.
Aspen® Woodburning Stove
Unprotected surfacesProtected Surfaces
Stove Installed
Parallel to Wall
Stove in Corner
Stove Installed
Parallel to Wall
Stove in Corner
Top Exit, No Heat Shields
Top Exit, Rear Heat Shield only
Rear Exit, Rear Heat Shield only
Top Exit, Rear Heat Shield and single-wall connector w/ shields, or double-wall connector
exit diagram
12/15/99 djt
Aspen® Woodburning Stove
You will need the following tools to assemble the Aspen:
• 9/16” open end wrench • safety glasses & gloves
• flat head screwdriver
• power drill w/ 1/8” (3mm) bit
• stub handle phillips screwdriver
• 7/16” open end wrench (for Ashlip & Outside Air
Carefully tilt the stove
on the pallet to install
first one front and one
rear leg.
Unpack the Stove
1. Remove the shipping straps and plastic wrap.
2.Inspect the stove and contents for shipping damage
or missing parts. Immediately notify your dealer of
any damage. Do not install this stove if any damage
is evident or any parts are missing.
Hardware Bag contents:
• Stove Legs, 4
• Hex Head Leg bolts with washers, 4
• #10 x 1/2” sheet metal screws, 3
• Owner’s Registration Card
• Touch-up Paint (Porcelain enamel stoves only)
Then tilt the stove up on
those legs to install the
remaining two.
attach legs
12/15/99 djt
Install Stove Legs
Leg installation will be accomplished most easily with
the help of an assistant who can tilt the stove onto its
side while you attach the legs.
1. With your assistant holding the stove up on its side,
remove the slotted screws from the leg mounting
holes at each corner of the stove bottom.
2.Install two legs, using the hex head bolts with washers from the parts bag. The shoulder of the legs
should seat within the locator bosses cast into the
stove bottom at each corner. (Fig. 22) Tighten the
bolts with the wrench. CAUTION: Overtighening
can strip tapped threads.
3.With your assistant, lift the stove up onto its legs and
hold it in a tilted position to install the remaining two
legs with washers and hex bolts.
Fig. 22 Install legs on one side of stove then the other.
1/4-20 x ⁵/₈” hex head
screws with washers
Fig. 23 Attach the Ashlip to the bottom plate.
install ashlip
Loosen Hex Bolt
Install the Ashlip
Use a 7/16” wrench to secure the Ashlip to the stove
bottom with two, 1/4-20 x 5/8” hex head screws and
washers found in the holes used to attach the ashlip.
(Fig. 23)
Install the Outside Air Adapter
The optional #1897 Outside Air Adapter provides a collar to which a 3 inch diameter air duct may be attached
directly to the air inlet area at the back of the stove. The
adapter should be attached to the stove before a bottom or rear heat shield is installed.
1. Remove the phillips head screw located just above
the primary air inlet at the back of the stove.
Fig. 24 Attach the adapter to the bottom plate.
2.Locate the hex bolt (Fig. 23) located in the center
rear edge of the stove bottom plate. Loosen this bolt
just enough to engage the Adapter clevis tab under
the washer and then retighten.
install outside
12/15/99 djt
Aspen® Woodburning Stove
3. If you are not installing a Rear Heat Shield, use the
phillips head screw to secure the upper flange of
the Adapter to the stove at the hole from which the
screw was removed in Step 1. (Fig. 24) Otherwise, a
heat shield spacer will be used here. (See “Install the
Rear Heat Shield”, below.)
Flue Collar Reversal
If a rear exit chimney connection is required, you will
need to remove the flue collar from the stove top and
move it to the back of the stove. (Fig. 25)
1. Use a phillips screwdriver to remove the two screws
and rear cover plate from the back of the stove.
2.Remove the flue collar by removal of the two phillips
screws from the top of the stove.
3.Attach the cover plate to the stove top. Be sure to
keep the gasket in place.
4. Secure the flue collar to the back of the stove.
5. Insert the crimped end of the first section of chimney
connector into the flue collar. Using the holes in the
collar as guides, drill 1/8” (3mm) holes through the
connector pipe. Use the three #10 x 1/2” sheet metal
screws provided to secure the chimney connection to
the flue collar.
Fig. 25 Reversing the flue collar.
flue collar reversal
Install the Rear Heat Shield
The #1896 Rear Heat Shield reflects radiant heat away
from combustible materials located behind the stove. Its
use enables you to install the stove at a reduced clearance to combustible materials in accordance with the
specifications in this manual.
1.Remove the three phillips head screws from the back
of the stove. The upper right screw also serves to
secure the thermostat cover to the stove. (Fig. 26)
2. Thread the three 1¹⁄₄" spacers provided with the heat
shield kit into the holes. Be sure to re-secure the thermostat cover using a spacer at that location. If the
Outside Air Adapter is used, secure its upper flange
to the hole above the primary air inlet using a spacer
instead of the screw. Hand tighten the spacers.
3.Align the holes in the heat shield with the spacers
and secure the shield to the spacers using the three
philips head screws previously removed. Tighten
firmly with a screwdriver.
Fig. 26 Install the rear heat shield.
install rear
heat shield
Install the Bottom Heat Shield
The #1985 Bottom Heat Shield must be used in the
U.S. and Canada in any installation on a floor that is
not composed of unpainted cement on earth.
1. Remove the 1/4-20x 3/8” phillips screw from the central mounting boss in the stove bottom. (Fig. 27)
2. Mount the bottom heat shield to the stove bottom
using the same phillips head screw previously removed. The shield will butt against the cast bosses
in the bottom of the ashlip at the front of the stove.
Fig. 27 Install the bottom heat shield.
install bottom heat shield
Aspen® Woodburning Stove
How the Aspen Works
Combustion control is achieved in the Aspen through
two separate air delivery systems.
The primary air control lever, located at the left rear
corner of the stove, controls the amount of incoming primary air for starting, maintaining, and reviving the fire.
More air entering the stove makes the fire burn hotter
and faster, while less air prolongs the burn at a lower
heat level.
For the greatest air supply and maximum heat output
(but the shortest burn time), move the lever to the
straight up (12 o’clock) position. For a fire that will last
longer with less heat, move the lever to the right. You
can set the lever anywhere in between the left and right
The Aspen features an automatic thermostat to ensure
an even heat output at any manual setting you select.
As the fuel burns, the thermostat reacts to the heat radiating from the stove surface and, consequently, adjusts
the air shutter attached to it . As the fire intensity (and
heat output) builds, the thermostat slowly closes the air
shutter, thereby restricting incoming combustion air. As
the fire intensity then wanes (and heat output lessens),
the thermostat responds and gradually opens the air
shutter which allows more combustion air to again
enliven the fire. This ebb and flow action functions
continuously to prolong the burn cycle until the fuelbed
is exhausted.
NAPTHA, OR ENGINE OIL. Also, never use
gasoline-type lantern fuel, kerosene, charcoal
lighter fluid, or similar liquids to start or “freshen up” a fire. Keep all such liquids well away
from the Aspen while it is in use.
Caution: the Aspen will be hot while in operation. Keep children, clothing and furniture away.
Contact may cause skin burns.
may cause a house fire, or can result in permanent damage to the stove. If any part of the
stove glows, you are overfiring.
Another separate supply of oxygen is delivered to the
upper area of the firebox to support combustion of
gases released from the main fuel bed. This Secondary Air enters the stove through two, unrestricted inlets
and is heated while passing through separate channels
before being delivered through three stainless steel
multi-ported tubes located at the top of the firebox.
Burn Only High-Quality Wood
The Aspen is designed to burn natural
wood only; do not burn any other fuels.
You will enjoy the best results when burning wood that
has been adequately air-dried. Avoid burning “green”
wood that has not been properly seasoned. The wood
should be no longer than 16” (410 mm) in length, however, you will find that shorter wood lengths ease refueling and promote the most efficient combustion.
The best hardwood fuels include oak, maple, beech,
ash, and hickory that has been split, stacked, and airdried outside under cover for at least one year.
For areas that do not have a supply of hardwood, commonly burned softwoods include tamarack, yellow pine,
white pine, Eastern red cedar, fir, and redwood. These
too should be properly dried.
Keep wood a safe distance from the heater and keep
it out of the areas around the heater used for refueling
and ash removal.
Use the Air Control Setting
that Works Best for You
No single air control setting will be appropriate for every
situation. Settings will differ depending on the quality of
the fuel, the amount of heat desired, and how long you
wish the fire to burn.
The control setting also depends on your particular
installation’s “draft,” or the force that moves air from the
stove up through the chimney. Draft is affected by such
things as the length, type, and location of the chimney,
local geography, nearby obstructions, and other factors.
Too much draft may cause excessive temperatures in
the Aspen, and could even damage it. On the other
hand, too little draft can cause backpuffing into the
room and/or the “plugging” of the chimney.
How do you know if your draft is excessively high or
low? Symptoms of too much draft include an uncontrollable burn or a glowing-red stove part. A sign of inadequate draft is smoke leaking into the room through the
stove or chimney connector joints, low heat, and dirty
Aspen® Woodburning Stove
In newer homes that are well-insulated and weathertight, poor draft may result from insufficient air in the
house. In such cases, a slightly opened window or
door, near the stove on the windward side of the house
will provide the fresh air needed.
A more effective option for delivering ample combustion
air to the stove is to duct air directly from outdoors to
the stove. In fact, in some areas, provisions for outside
combustion air are required in all new construction. The
optional Aspen Outside Air Adapter #1897 is available
from your dealer.
When you first begin using the stove, pay attention
to the air control settings. You will quickly find that a
specific setting will give you a fixed amount of heat. It
may take some time to determine the amount of heat
and the length of burn you should expect from various
Do not for any reason attempt to increase the firing
of your heater by altering the air control adjustment
range outlined in these directions.
Use the following air control settings as a starting point
to help determine the best settings for your installation.
(Fig. 28)
Aspen Control Settings
Burn Rate­­­­­­­­­ Primary Air Control High
From 12:00 Medium From 1:00
From 2:00
Before you start using the stove, please read the Appendix on Draft Management starting on page 24 to
learn how the characteristics of your installation will
affect the stove’s performance. You and the stove are
parts of a system, and other parts of the system have a
strong effect on operation; you may need to vary your
firing technique to get the performance you want.
Starting and Maintaining a Fire
Conditioning Your Stove
Cast iron is extremely strong, but it can be broken with
a sharp blow from a hammer or from the thermal shock
of rapid and extreme temperature change.
The cast plates expand and contract with changes in
temperature. When you first begin using your Aspen,
minimize thermal stress by allowing the plates to adjust
gradually during three or four initial break-in fires following Steps 1-3.
Burn solid wood fuel only, and burn it
directly on the grate. Do not elevate the
fuel. Do not burn coal or other fuels.
warning: operate this stove only with the
door fully closed.
Fig. 28 Air inlet shutter settings; Low - Medium - High.
The Primary Air Inlet must be fully open when starting a fire or when refueling.
Step 1. Open the primary air control fully.
Step 2. Place several sheets
of crumpled newspaper
in the stove. Avoid using air
or settings
colored paper, as
these burn poorly. At the front of the firebox, place
on the paper six or eight pieces
of dry djt
kindling split
to a finger-width size, and on the kindling lay two or
three larger sticks of split dry wood approximately 1-2” (25-51 mm) in diameter.
Step 3. Light the newspaper and close the door.
Gradually build up the fire by adding a few 3-5” (80120 mm) diameter splits. If this is one of the first
few “break-in” fires, let the fire burn brightly, and
then let it die out.
• During the break-in fires, don’t let the stove get
hotter than 500°F. (260°C) as measured on an optional stove-top thermometer. Adjust the air control
lever as necessary to control the fire.
• Some odor from the stove’s hot metal, the paint,
and the cement is normal for the first few fires.
NOTE: Some chimneys need to be “primed,” or
warmed up, before they will draw sufficiently to sustain a fire. To correct this situation, roll up a couple
pieces of newspaper, place them on top of the
kindling and toward the back of the stove, light them,
and close the door. This should heat the chimney
enough to initiate strong draft.
Aspen® Woodburning Stove
Once the draft is established, open the front door
and light the rest of the fuel bed at the bottom. Do
not light the main bed of fuel until the chimney begins drawing.
Step 4. After the stove has been broken-in using
Steps 1-3, continue to build the fire gradually. Add
larger wood with a diameter of 3-4” (75-102 mm).
Continue adding split logs of this size to the brisklyburning fire until there is a glowing ember bed at
least 2” (51 mm) deep. A good ember bed is necessary for proper functioning and may take up to an
hour to establish.
Step 5. Adjust the thermostatic air control for the desired heat output.
Refuel While the Embers Are Still Hot
Reload the Aspen while it is still hot and there are plenty of glowing embers to re-kindle the fire. Include some
smaller pieces of wood in the new load of fuel to help
the stove return to its operating temperature quickly.
Wear stove gloves, and follow this procedure when you
reload your stove:
Fig. 29 Start a fire with small, dry kindling.
starting a fire
Step 1. Open the thermostat lever.
Step 2. Open the door and check the ash level in the
ash pan. If necessary, dispose of the ashes and
replace the pan.
Step 3. Use a fireplace tool to break up the charcoal
and direct ash through the grate. Pull the charcoal
from the back to the front. This will encourage efficient combustion as the fuel burns from front to rear.
(Fig. 31)
Step 4. Load wood — smaller, split pieces first. Close
the door. Ideal performance will be achieved by operating with the air control set in the maximum (HIGH)
positon for several minutes after refueling. Reset the
primary air control for the desired heat output after
the fire is re-established.
Fig. 30 Gradually add larger pieces of wood until all the wood
is burning well.
good fire
Aspen® Woodburning Stove
Ash Disposal
Remove ash before it reaches the top of the ash pan.
Check the level at least once a day, and before each refueling. Using stove gloves, pull the ash pan out of the
stove by its handle. Remove the ash pan and properly
dispose of the ashes. Be sure to keep the pan level during disposal.
Empty the ash pan regularly, typically every one to
three days. The frequency will vary depending on how
you operate your Aspen; if you burn more wood at
higher heat output settings, ash will accumulate rapidly.
Dispose of ashes into a metal container with a tight-fitting lid kept outdoors. Put the closed container of ash
on a noncombustible floor or on the ground, well away
from all combustible materials, pending final disposal.
If the ash is disposed of by burial in soil or otherwise
locally dispersed, keep it in the closed container until all
cinders have thoroughly cooled. You can use wood ash
as a garden fertilizer.
CAUTION: Never use your household or shop vacuum cleaner to remove ash from the stove; always
remove and dispose of the ash properly.
CAUTION: Avoid slamming the stove
door or striking the glass panel. Do
not operate the stove with the glass
panel missing, damaged, or broken. Do
not install substitute materials. See
Maintenance section for replacement
Smoke Detectors
The use of smoke detectors throughout the home is
strongly advised, if not required by building codes or insurance regulations. It is a good idea to install a smoke
detector in the living areas and each bedroom.
You may not, however, wish to install a detector in the
immediate vicinity of the stove. Depending on the sensitivity of the unit, the alarm can be set off while you are
tending the fire or emptying the ashes. If you install a
detector in the same room, locate it as far away from
the stove as possible.
Keep Air Inlet Free of
Ash (Front Edge)
Primary Air
Outlet Plate
Fig. 31 Primary air outlet - keep clear of ash and charcoal
IMPORTANT: A critical
source of air into the Aspen
firebox is located in front of the ash grate as shown
ash pan
in Figure 31. If this air slot becomes plugged with
ash, a sluggish, cool
fire and dirty glass will result.
Keep this air slot clear of ash. Refer to the Maintenance section for instructions to more thoroughly
clean ash from beneath the primary air plate.
Aspen® Woodburning Stove
Let the fire in the stove go out and allow the stove to
cool completely before beginning any maintenance
Glass Replacement
Replace glass only with MHSC part no. 30000362. The
glass panel rests on a cushion provided by three flat
gaskets, and is held in place by two clips. (Fig. 32) The
glass is coated on one side which is slightly colored.
Remove the door from the stove and place it on a
sturdy, level work surface. Use a towel to protect the
porcelain enamel finish.
Care of the Cast Iron Surface
An occasional dusting with a dry rag will keep the
painted cast iron of your Aspen looking new.
The stove’s paint can be touched up as needed. First,
clean the areas to be painted with a wire brush. Then,
touch up the stove with high temperature stove paint.
Apply the paint sparingly, and keep in mind that two
light coats of paint are better than a single heavy one.
Care of Porcelain Enamel Finish
Use a dry or slightly damp rag or a soft brush to remove
spills or stains. For difficult jobs that require a cleaning
agent, use only a kitchen appliance cleaner or polish
recommended for use on enamel surfaces.
Cleaning the Glass
Most of the carbon deposits on the glass will burn off
during hot fires. However, the ash residue that accumulates on the glass surface should be removed regularly
to prevent etching. Follow this procedure to clean the
• Be sure the glass is completely cool.
• Clean the glass with water or a cleaner made
especially for this purpose. Do not use abrasive
• Rinse the glass thoroughly.
• Dry the glass completely.
1. Remove the Door Manifold. (Two phillips head
2. Remove the Retainer Clips. (Two phillips head
screws on each clip).
3. Inspect the Gasket. If the window gasket is in good
condition, you can leave it in place. If you replace it,
use only MHSC gaskets (two vertical- PN 30000383;
one horizontal– PN 30000384). Be sure the channel around the window opening is clean, and free of
Place the three flat gaskets (two vertical, one horizontal) into the panel inset as shown in Figure 32.
4. Install the Glass. Lay the glass on the inner gasket
with the coated side down (toward the outside of the
door). Tighten the screws snugly, but loose enough
to allow for a little movement of the glass when the
stove is in operation. Overtightening can crack the
glass immediately or cause it to crack if it is unable
to expand when hot.
Glass Clip
Door Manifold
Vertical Gasket
Horizontal Gasket
Fig. 32 Door glass installation.
Glass Panel
Aspen® Woodburning Stove
Gasket Replacement
Adjust the Door
Your Aspen uses rope-type fiberglass gaskets to make
a tight seal between some parts. With use, particularly
on those parts that move, gaskets can become brittle
and compressed and can begin to lose their effectiveness. These will need periodic replacement.
The door latch may need adjustment as the gasket
material compresses over time. The latch engagement
may be tightened by removing the shim washers that
are under the Latch Plate. (Fig. 33) Remove only one
pair at a time. When a tight engagement can no longer
be achieved with no shim washers in place, the entire
door gasket should be replaced. Use only MHSC part
no. 700-0910.
The sizes of replaceable gasket are listed below, along
with their applications.
Gasket Diameter...
...And the Parts it Seals
5/16” Round
Flue Collar Gasket
3/8” Round
7/16” Round
Door Gasket
1/2” Flat, two
Vertical Gasket for glass
1/2” Flat
Horizontal Gasket for glass
Wait until the fire is out and the stove has cooled. Be
sure to follow the standard safety procedure for working
with dusty materials: Wear safety goggles and a dust
Step 1. Remove the existing gasket by grasping an
end and pulling firmly.
Step 2. Use a wire brush or a screwdriver to clean
the channel of any remaining cement or bits of gasket.
Remove stubborn deposits of cement with a cold chisel
if necessary.
Step 3. Determine the correct length of the appropriate-sized gasket by laying it out in the channel. Allow an
extra 1-2” (25-51 mm), and mark the spot to be cut.
Step 4. Remove the gasket from the channel, place it
on a wood cutting surface, and cut it at the marked spot
with a utility knife.
Twist the ends slightly to discourage the gasket from
Shim Washers
Latch Plate
door latch
Step 5. Lay an unbroken 1/8” (3 mm) bead of gasket
cement in the newly-cleaned channel.
Step 6. Starting at one end, press the gasket into the
Fig. 33 Remove shim washers to tighten latch engagement.
Ensure a good joint where the gasket meets before
trimming any excess. Do not overlap the gasket ends or
leave ends with ragged edges.
The Chimney System
Step 7. Press the gasketed part firmly against its
normal mating surface to seat the gasket evenly in its
channel. Close and latch the door to do this; close the
door on a piece of waxed paper to keep the cement
from migrating onto the non-gasketed part, or tap other
Your Aspen is designed to reduce creosote buildup
significantly. However, regular chimney inspection and
maintenance must still be performed. For safety, good
stove performance, and to protect your chimney and
chimney connector, inspect your
chimney and chimney
connector on a regular schedule.
the system
necessary. Failure to keep the chimney and connector
system clean can result in a serious
chimney fire.
Step 8. Clean excess cement from around the channel.
Let the cement that holds the new gasket dry thoroughly.
Aspen® Woodburning Stove
When wood is burned slowly, it produces tar,
organic vapors and moisture that combine to form
creosote. The creosote vapors condense in the
relatively cool chimney flue. As a result, creosote
residue accumulates on the flue lining. When
ignited, this creosote makes an extremely hot fire
within the flue system that can damage the chimney
and overheat adjacent combustible material.
If you do have a chimney fire, promptly:
• Close the damper and thermostat lever.
• Get everyone out of the house.
• Call the Fire Department.
You should inspect the system every two weeks during
the heating season as part of a regular maintenance
schedule. To inspect the chimney, let the stove cool
completely. Then, using a mirror and a strong light,
sight up through the flue collar into the chimney flue. If it
is not possible to inspect the flue system in this fashion,
the stove must be disconnected to provide better viewing access.
If a significant layer of creosote has accumulated
— 1/8” (3 mm) or more — remove it to reduce the risk
of a chimney fire.
Clean the chimney using a brush the same size and
shape as the flue liner. Flexible fiberglass rods are
used to run the brush up and down the liner, causing
any deposits to fall to the bottom of the chimney where
they can be removed through the clean-out door.
The chimney connector should be cleaned by disconnecting the sections, taking them outside, and removing
any deposits with a stiff wire brush. Reinstall the connector sections after cleaning, being sure to secure the
individual sections with sheet metal screws.
• Check gasketing for wear or compression, and
replace if necessary. A ‘paper test’ will guide you on
this. Close and lock the door or damper on a slip of
paper and then try to pull the paper out. If the paper
pulls out with little or no resistance, the gasket isn’t
snug enough at that spot. If adjusting the damper
or latch doesn’t result in a seal that makes it hard to
pull the paper out, replace the gasketing.
Check door handle for tightness. Adjust if needed.
Check heat shield screws. Tighten as necessary.
Clean dust from the inner sides of bottom, rear and
connector heat shields.
Remove ashes from the ash pan and replace with
moisture absorbing material (such as cat litter) to
keep the stove interior dry. Close the stove door to
keep cats from using the litter.
Touch up the paint on black stoves.
Clean the Primary Air Outlet
Ash accumulation below the primary air plate will eventually result in sluggish, cool fires. Ash accumulation
should be removed at least yearly as follows:
1. Remove the phillips head screw that retains the
Primary Air Plate. (Fig. 34)
2. Use a screwdriver to pry the plate out of the cemented seams.
3. Remove ash debris from the cavity.
4. Use high-temperature furnace cement to reseal the
front seam and side seams and replace the plate.
Secure with the phillips head screw.
If you cannot inspect or clean the chimney yourself,
contact your local Vermont Castings’ Authorized Dealer
or hire a professional chimney sweep.
Annual Maintenance
Air Plate
Perform a thorough cleaning, inspection and repair
each Spring, at the end of the heating season.
• Thoroughly clean the chimney and chimney connector.
• Inspect the chimney for damage and deterioration.
Replace weak sections of prefabricated chimney.
Have a mason make repairs to a masonry chimney.
• Inspect the chimney connector and replace any
damaged sections.
• Clean ash debris from under the primary air plate.
See procedure below.
Remove All
Ash Debris
from this
Fig. 34 Remove phillips head screw and primary air plate to
clean ash from cavity.
primary air
Aspen® Woodburning Stove
Draft Management
Your stove is only one part of a system that includes the
chimney, the operator, the fuel and the home. The other
parts of the system will affect how well the stove works.
When there is a good match between all the parts, the
stove works well.
Wood stove operation depends on natural (unforced)
draft. Natural draft occurs when exhaust gas is hotter
(and therefore lighter) than the outdoor air at the top
of the chimney. The greater the temperature difference, the stronger the draft. As the hot exhaust gas
rises out of the chimney it generates suction that draws
air into the stove for combustion. A slow, lazy fire with
the stove’s air inlets fully open indicates a weak draft.
A brisk fire, supported only by air entering the stove
through the normal inlets, indicates a good draft. The
inlets are passive; they regulate how much air can enter
the stove, but they do not move air into it.
The efficiency of a modern woodburning appliance,
(in which the amount of air available for combustion is
regulated), depends on the chimney to keep exhaust
gases warm all the way outdoors. The characteristics
of your chimney - whether it is steel or masonry, interior
or exterior, matched or mismatched to the stove collar
- determine how quickly it will warm up and how well
it will sustain the optimum temperatures necessary to
maintain strong draft and efficient combustion. Here follows a description of various flue system characteristics
and related effects on stove performance.
Masonry Chimney
Although masonry is the traditional material used for
chimney construction, it can have distinct performance
disadvantages when used to vent a controlled-combustion woodstove. Masonry forms an effective ‘heat sink’
- that is, it absorbs and holds heat for long periods of
time. The large mass, however, may take a long time to
become hot enough to sustain a strong draft. The larger
the chimney (in total mass), the longer it will take to
warm up. Cold masonry will actually cool exhaust gases
enough to diminish draft strength. This problem is compounded if the chimney is located outside the home or if
the chimney flue has a cross-sectional size larger than
the stove outlet.
Steel Chimney
Most factory-made ‘Class A’ steel chimneys have a
layer of insulation around the inner flue. This insulation
keeps the smoke warm and protects the surrounding
structure from the high flue temperatures. Because the
insulation is less dense than masonry, the inner steel
liner warms up more quickly than a masonry chimney.
Although steel chimneys are not as attractive as their
masonry counterparts, they are very durable and generally outperform masonry.
Inside/Outside Location
Because the chimney’s function is to keep the smoke
warm, it is best to locate it inside the house. This location uses the house as insulation for the flue and allows
some radiant heat release from the flue into the home.
Since an interior chimney does not continuously lose its
heat to the outdoors, it takes less heat from the stove to
get it warm and keep it warm.
Flue Sizing
The flue size for a controlled-combustion appliance
should be based on the cross-sectional volume of the
stove flue outlet. In this case, more is definitely not
better. Hot gases lose heat through expansion; if a
stove with a six-inch flue collar (28 square inch area)
is vented into a 10” x 10” flue, the gases will expand to
over three times their original volume. As gases cool
with expansion, draft strength decreases. If an oversized flue is also outside the house, the heat it absorbs
will be conducted to the outdoor air and the flue will
remain relatively cool.
It is common for a masonry flue to be oversized for the
stove. Such a chimney can take quite a while to warm
up and the stove performance will likely be disappointing. The best solution to an oversize flue problem is
the installation of an insulated steel chimney liner of
the same diameter as the appliance flue outlet. The
liner keeps the exhaust gas warm and the result is a
stronger draft. An uninsulated liner is a second choice
- although the liner will keep the exhaust restricted to its
original volume, the air around the liner will require time
and heat energy to warm up.
Check your local codes. You may be required to install
a flue liner in any oversize or masonry flue.
Aspen® Woodburning Stove
Pipe & Chimney Layout
Every bend in the flue will act as a brake on the exhaust
as it flows from the firebox to the chimney cap. The
ideal pipe and chimney layout is straight up from the
stove through a completely straight chimney. Use this
layout if at all possible as it will promote optimum stove
performance and simplify maintenance.
If the stovepipe must elbow to enter a chimney, locate
the elbow about midway between the stove top and
the chimney thimble. This configuration lets the smoke
speed up before it must turn, keeps some pipe in the
room for heat transfer, and allows long-term flexibility
for installing a different appliance without relocating the
There should be no more than eight feet of single-wall
stove pipe between the stove and a chimney. Longer
runs can cool the smoke enough to cause draft and
creosote problems. Use double-wall stove pipe for
longer runs.
You can judge the moisture content of wood by its appearance and weight or use a commercially available
moisture meter for an exact measurement. Unseasoned
wood will be a third heavier than dry wood. Also, look
for cracks (‘checking’) in the ends of the log that result
from contraction as the wood dries. The longer and
wider the cracks, the dryer the wood is. Purchase your
fuel from a reputable dealer.
Creosote is a by-product of low-temperature stove
operations, weak draft or both. It is a tar that results
when unburned gases condense inside the flue system at temperatures below 290°F. Creosote is volatile
and can generate chimney fire. All of the installation
characteristics that adversely affect chimney draft also
promote creosote condensation. Consequently, you can
minimize creosote accumulation with an effective chimney design and the use of operational techniques that
encourage good draft and complete combustion.
Single Venting
Your stove requires a dedicated flue. Do not connect
the stove to a flue used by any other appliance. Chimney draft is a natural form of energy and follows the
path of least resistance. If the stove is vented to a flue
that also serves an open fireplace or another appliance,
the draft will also pull air in through those avenues. The
additional air flow will lower flue temperatures, reduce
draft strength and promote creosote development; overall stove performance will suffer. The effect is similar
to that of a vacuum cleaner with a hole in the hose. In
some extreme instances, the other appliance can even
impose a negative draft and result in a dangerous draft
Backpuffing is a condition that results when the draft is
too weak to pull flue gases out of the chimney system
as fast as the fire is generating more. Volatile gases
build up within the firebox until reaching a density and
temperature at which they ignite. With this ignition, you
may hear a muffled popping sound and see a bit of
smoke forced out of the air inlets.
Even the best stove installation will not perform well if
poor fuel is used. I available, always use hardwood that
has been air-dried (‘seasoned’) 12-18 months. Softwood burns more rapidly than hardwood and has a high
resin content conducive to creosote production. Decayed wood of any type has little heat value and should
not be used.
All unseasoned (‘green’) wood has a high moisture content. Much of its heat value will be used to evaporate
moisture before the wood can burn. This significantly
reduces not only the amount of energy available to
warm your home, but also the intensity of the fire and
temperature of the exhaust gas. Incomplete combustion
and cool flue temperatures promote creosote formation
and weak draft.
This condition is most likely to occur in the spring or fall
when moderate outdoor temperatures and low intensity fires combine to inhibit draft strength. If your stove
backpuffs, open the damper to let the smoke rise to the
flue more quickly. Also, open the air inlets to induce a
livelier fire and speed airflow through the stove. Avoid
large loads of firewood at one time. You should always
see lively, dancing flames in the firebox; a lazy, smoky
fire is inefficient and will promote draft problems.
Draft Testing
An easy way to determine whether your chimney draft
is strong enough is to close the stove damper, wait a
few minutes to let the airflow stabilize, and then test
whether you can vary the strength of the fire by swinging the air control open and closed. Results here are
not always instant; you may need to wait a few minutes
for a change in the air control setting to have an effect on the fire. If there is no change, the draft is not
yet strong enough to let you close the damper. You will
need to open it for awhile longer and manage the fire
with the air inlet until the draft strengthens. Keep a record of your operational habits and relate them to their
effects on the stove’s function. You will be rewarded
with safe and efficient performance.
Aspen® Woodburning Stove
Negative Pressure
Good draft also depends on a sufficient supply of air
to the stove. The chimney cannot pull more air than is
available. Sluggish draft can be caused by a house that
is tight enough to prevent the ready flow of air to the
stove, or by competition between the stove and other
appliances that vent indoor air to the outside; i.e., exhaust fans for range hoods, clothes dryers, bathroom,
etc. If the chimney draws well when all such equipment
is turned off (or sealed, in the case of the fireplaces
and/or other stoves), you simply need to be attentive
in timing the use of the other appliances. If you need
to crack a nearby window or door to enable the chimney to pull well, you should install an outside-air intake
to bring combustion air directly to the stove. Consult
your Vermont Castings’ dealer regarding an adapter to
attach to the stove to connect an air duct for outdoor
combustion air.
Woodburning is more an art than a science. Art includes technique and since installations, homes and
fuel vary, the stove operator must also vary technique,
(mostly timing), to achieve satisfying results. Over
time, you will become familiar with the intricacies and
nuances of your particular installation and you will be
able to identify cause and effect in a variety of seasonal
Aspen® Woodburning Stove
41 20 41 21 35 21 43 1 12 11 47 37 36 13 33 41 19 42 38 43 24 51 38 57
44 19 6 2 51 50 38 50 41 19 4 3 51 19 53 22 19 5 40 17 18 28 8 25 10 38 45 50 46 38 7 50 9 54 47 38 14 23 16 39 15 52 34 27 30 31 26 32 48 49 56 48 48 29 55 32 MHSC reserves the right to make changes in design, materials, specifications, prices and discontinue colors and products at any tme, without notice.
Aspen Woodburning Stove
Model 1920
0369 Aspen 1920 parts 8/02 27
Aspen® Woodburning Stove
Aspen Woodburning Stove
Model 1920 (continued)
Item DescriptionPart Number
Item DescriptionPart Number
Top Right Side
Secondary Air Channel, Right
Left Side
Secondary Air Channel, Left
Secondary Air Tube
Bottom, Inner
Thermostat Cover
Leg (4)
Leg Bolt, 3/8”-16x1” hex bolt (4)
3/8” Flat Washer (4)
Primary Air Plate
Grate, Wood
Firebrick (10)
Flue Cover
5/16” Adhesive Gasket
Primary Air Flap
Door Handle Catch
Wooden Handle
Door Handle Shaft
Door Pin, Long
See Chart Pg. 28
See Chart Pg. 28
See Chart Pg. 28
See Chart Pg. 28
See Chart Pg. 28
See Chart Pg. 28
See Chart Pg. 28
See Chart Pg. 28
Glass Gasket, horizontal (8¹⁄₄")
Glass Gasket, vertical (2)
Glass Panel
Glass Retainer (2)
Glass Clips (2)
Door Manifold
Flue Collar
See Chart Pg. 28
Friction Spring
Primary Thermostat Assembly
1/4" Flat Washer, Zinc (10)
1/4-20x5/8" Hex Screw (2)
1/4-20x1¹⁄₄" Flt Hd Phillips Screw
1/4-20x3/4" Flat Hd Phillip Screw (6)
Ball Chain, Thermostat
10-20x1/4" Plain Truss Head Screw (5) 1200996
1/4-20x5/8" Round Hd Phillips Screw (2)1200896
1/4-20x3/8" Round Hd Philips Screw (2) 1200894
1/4 Flat Washer (4)
7/16” Round Gasket (9.3ft.)
10-24x3/8" Round Hd Slotted Screw (6) 1200983
3/16"x1" Roll Pin
1/4-20x1" Hex Head Screw (8)
Gasket, Flat w/adhesive (3 ft.)
1/4-20x3/8" Pan Hd Phillips Screw
Deflector Rib
Bottom Heat Shield
Handle,Screw Pan head Phillips
Washer, Flat #10 .218 id x .5 od
Rear Heat Shield
Spacer HS 1 25 NI (not shown)
Shell Enamel Parts - Aspen
Part NameClassicEbonyGreenBrownClassic GreenBordeaux
30001654 30001660 30001661 30002588
Left Side II
30001656 30001664 30001665 30002591
Right Side II 30001655 30001662 30001663 30002590
Flue Collar
30000353 30000483 30000492 30002589
Flue Cover
30000351 30000481 30000490 30002585
30000348 30000478 30000487 30002586
30000352 30000482 30000491 30002593
30000350 30000480 30000489 30002587
Leg Set
of Four
30000502 30000539 30000540 30002594
Single Leg
30000360 30000484 30000493 30002592
Aspen® Woodburning Stove
Aspen® Woodburning Stove
Aspen® Woodburning Stove
Limited 3 Year Warranty
MHSC warrants that this woodburning stove will be free of defects
in material and workmanship for a period of three years from the
date you receive it, except that the catalyst, thermostat assembly,
handles, glass door panels, cement, and gasketing shall be warranted as described below.
Products will repair or replace, at its option, any part found to be
defective upon inspection by a MHSC Authorized Dealer. The
customer must return the defective part or the stove, with shipping prepaid, to the Authorized Dealer or pay for any Authorized
Dealer in-home travel fees or service charges for in-home repair
work. It is the dealer’s option whether the repair work will be
done in the customer’s home or in the dealer’s shop. If, upon
inspection, the damage is found to be the fault of the manufacturer, repairs will be authorized at no charge to the customer for
parts and/or labor.
Any woodburning stove or part thereof that is repaired or
replaced during the limited warranty period will be warranted
under the terms of the limited warranty for a period not to
exceed the remaining term of the original limited warranty or six
(6) months, whichever is longer.
Limited 1 Year Warranty
4. This warranty does not cover a stove repaired by someone
other than a MHSC Authorized Dealer.
5. Damage to the unit while in transit is not covered by this
warranty but is subject to a claim against the common carrier. Contact MHSC Authorized Dealer from whom you
purchased your stove or MHSC if the purchase was direct.
(Do not operate the stove as this may negate the ability to
process the claim with the carrier.)
6. Claims are not valid where the installation does not conform
to local building and fire codes or, in their absence, to the
recommendations in our Owner’s Guide.
7. The salt air environment of coastal areas, or a high-humidity environment, can be corrosive to the porcelain enamel
finish. These conditions can cause rusting of the cast iron
beneath the porcelain enamel finish, which will cause the
porcelain enamel finish to flake off. This warranty does not
cover damage caused by a salt air or high-humidity environment.
8. MHSC shall have no obligation to enhance or update any
unit once manufactured.
The following parts of the woodburning stove are warranted to
be free of defects in material and workmanship for a period of
one year from the date you receive it: The thermostat assembly, handles, glass door panels, cement, and gasketing. Any of
these items found to be defective will be repaired or replaced at
no charge, upon the return of the part with postage prepaid to a
MHSC Authorized Dealer.
Any part repaired or replaced during the limited warranty period
will be warranted under the terms of the limited warranty for a
period not to exceed the remaining term of the original limited
warranty or six (6) months, whichever is longer.
Some states do not allow the exclusion or limitations of incidential and consequential damages or limitations on how long an
implied warranty lasts, so the above limitations may not apply to
you. This warranty gives you specific rights and you may have
other rights which vary from state to state.
Exclusions & Limitations
How to Obtain Service
1. This warranty is transferable; however, proof of original retail
purchase is required.
2. This warranty does not cover misuse of the this stove. Misuse includes overfiring which will result if the stove is used
in such a manner as to cause one or more of the plates to
glow red. Overfiring can be identified later by warped plates
and areas where the paint pigment has burned off. Overfiring in enamel fireplaces is identified by bubbling, cracking,
chipping and discoloration of the porcelain enamel finish.
MHSC offers no warranty on chipping of enamel surfaces.
Inspect your woodburning stove prior to accepting it for any
damage to the enamel.
3. This warranty does not cover misuse of the stove as described in the Owner’s Guide, nor does it cover any stove
which has been modified unless authorized by a MHSC
representative in writing. This warranty does not cover
damage to the stove caused by burning salt saturated wood,
chemically treated wood, or any fuel not recommended in
the Owner’s Guide.
If a defect is noted within the warranty period, the customer
should contact a MHSC Authorized Dealer or MHSC if the
purchase was direct with the following information:
1. Name, address, and telephone number of the purchaser.
2. Date of purchase.
3. Serial number from the label on the back.
4. Nature of the defect or damage.
5. Any relevant information or circumstances, e.g., installation,
mode of operation when defect was noted.
A warranty claim will then start in process. MHSC reserves the
right to withhold final approval of a warranty claim pending a
visual inspection of the defect by authorized representatives.
149 Cleveland Drive • Paris, Kentucky 40361
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