HearthStone 8012 User manual

Mansfield 2: 6400-40484
Rev 0: 06/04/2012
Mansfield
Woodstove
(Model 8012)
Owner's Manual
Installation &
Operating Instructions
PLEASE READ THIS ENTIRE OWNER’S MANUAL BEFORE YOU INSTALL AND USE
YOUR NEW Mansfield WOOD STOVE. To reduce the risk of fire, follow the installation
instructions. Failure to follow these instructions may result in property damage,
bodily injury, or even death.
SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCE!
CONTACT LOCAL AUTHORITIES HAVING JURISDICTION (BUILDING DEPARTMENT or
FIRE OFFICIALS) ABOUT PERMITS REQUIRED, RESTRICTIONS AND INSTALLATION
INSPECTION IN YOUR AREA.

2
Intentionally Blank

3
Table of Contents
Introduction............................................................................................................................ 4
Safety Information................................................................................................................. 5
Codes..................................................................................................................................................................5
Periodic Checklist................................................................................................................................................6
Thermo-Ceramic Baffle System..........................................................................................................................6
Emergency Procedures ......................................................................................................................................6
Specifications........................................................................................................................ 7
Installation.............................................................................................................................. 8
Unpacking...........................................................................................................................................................8
Installing Your Stove...........................................................................................................................................8
Clearances to NFPA 211 Protected Surfaces ....................................................................................................8
Hearth Requirements & Floor Protection............................................................................................................ 8
Outside Air Supply ..............................................................................................................................................8
Clearances To Combustibles............................................................................................................................10
Venting Components & Configuration .............................................................................. 13
Components of a Venting System ....................................................................................................................13
Installing a Venting System...............................................................................................................................13
Connecting Your Wood Stove...........................................................................................................................14
Installing In a Mobile Home...............................................................................................................................17
Operation.............................................................................................................................. 18
Controls & Features..........................................................................................................................................18
Choosing Firewood...........................................................................................................................................19
Building A Fire...................................................................................................................................................20
Breaking In Your Wood Stove...........................................................................................................................20
Normal Operation..............................................................................................................................................21
Removal & Disposal of Ashes...........................................................................................................................22
Maintenance......................................................................................................................... 23
Monitoring Stove Temperatures........................................................................................................................23
Creosote Formation & Need for Removal.........................................................................................................23
Gaskets.............................................................................................................................................................23
Glass.................................................................................................................................................................23
Stone.................................................................................................................................................................24
Cast Iron............................................................................................................................................................24
Troubleshooting.................................................................................................................. 25
Troubleshooting Guide......................................................................................................................................26
Replacement Parts & Optional Accessories.....................................................................................................27
Safety Label ......................................................................................................................... 28

4
Introduction
Congratulations! You have just invested in a most
unique wood burning stove –the Mansfield Wood
Burning Stove from Hearthstone Quality Home
Heating Products Inc®. The Mansfield, model 8012,
is one of our largest and one of the cleanest burning,
EPA certified, non-catalytic wood burning stoves. At
3.2 cubic feet firebox capacity and a low 2.8 grams
per hour of particulate emissions you can be proud
to join the Hearthstone family with our Premier Wood
Burning Stove. The generous depth allows for
straight in loading of wood up to 20 inches long!
Your purchase ensures years of clean, comfortable
heat with minimal maintenance. You will receive the
benefits of the most advanced technology in wood
burning without the cost and maintenance
requirements of a catalytic stove. The Mansfield
blends modern technology with the unique beauty
and heating qualities of soapstone (traditionally
renowned for its even heat production and long heat
retaining ability). We trust that you will appreciate
the quality of our handcrafted product.
Please read this manual in its entirety. Its purpose
is to familiarize you with your stove's safe
installation, proper break-in, operation and
maintenance. It contains information that will be
useful to you now and in years to come, so keep it
handy and refer to it as needed.
Use these instructions as well as national, state, and
local building codes to install your stove. Be sure to
maintain the designated stovepipe and stove
clearances to walls, ceilings, hearth, and other
combustible surfaces. This will help reduce the risk
of fire. Failure to follow these instructions can result
in property damage, bodily injury, and even death.
Locate your stove in a safe, convenient, open area;
away from traffic flow, doors, and hallways; and near
a chimney and chimney connector. Review the
proper clearance measurements from combustible
surfaces. You can safely reduce required clearances
in most cases with a special connector pipe and
special wall coverings as specified by this manual,
the NFPA 211 codes, and your local authorities
having jurisdiction.
Keep furniture, drapes, curtains, wood, paper, and
other combustibles far away from the stove. Never
install the stove in a location where gasoline,
kerosene, charcoal lighter fluid or other flammable
liquids are used or stored.
Locate the stove centrally in your living area to allow
the heat to travel naturally to distant rooms. We
recommend that you do not locate your stove in an
uninsulated basement. The amount of radiant
energy required to heat concrete basement walls is
so great that most of the usable heat is absorbed by
them and lost.
SAFETY NOTICE: A HOUSE FIRE MAY
RESULT IF THIS STOVE IS NOT INSTALLED
PROPERLY. FOR YOUR SAFETY,
CAREFULLY FOLLOW THE INSTALLATION
DIRECTIONS. CONTACT LOCAL BUILDING
OR FIRE OFFICIALS ABOUT RESTRICTIONS
AND INSTALLATION INSPECTION IN YOUR
AREA.
The performance of your stove depends on many
variables. Since all installations are unique, the
general information and operating procedures
presented here can only serve as useful guidelines
rather than hard and fast rules. Should you have
any questions, do not hesitate to contact your dealer
for additional information.
This stove is manufactured and warranted by:
Hearthstone Quality Home Heating Products, Inc®
317 Stafford Ave.
Morrisville, VT. 05661

5
Safety Information
Read and understand this Owner's Manual
thoroughly before installing and using this
stove.
Codes
When you install your Mansfield wood stove, it is
imperative that you adhere to all local codes, which
can be obtained from either of the following two
National sources:
American National Standards Institute, Inc.(ANSI)
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc. (NFPA)
Battery March Park
Quincy, MA 02269
If you are installing your Mansfield in a mobile home,
follow the guidelines described in the Manufactured
Home Construction and Safety Standard, Title 24
CFR, Part 3280 (United States).
Make sure to install your stove:
According to the manufacturer's
recommendations.
In accordance with all applicable codes.
With the proper sized chimney.
When using your stove:
Warn children and others unfamiliar with
woodstoves of the danger of touching hot,
radiating surfaces of your stove. For your
additional safety, obtain hearth and stove guards
through your local dealer.
Follow recommended break-in procedure as
outlined in this manual.
Burn natural wood only. Higher efficiencies and
lower emissions result when burning air-dried,
seasoned wood, as compared to green or
freshly cut wood.
Use caution when loading firewood into a hot
stove.
Keep the ash pan tray fully inserted and the ash
door closed tightly.
Inspect the stove pipe, chimney connector and
chimney, as recommended.
Ensure the removable ash lip is in place while
using the stove. If the ash lip is not installed
properly, the hearth may exceed safe
temperatures.
Follow these safety precautions:
Never modify this stove in any way, especially
the primary air control system.
Never burn kiln dried wood, painted or treated
wood, solvents, trash, plywood, colored or
glossy paper, artificial logs, cardboard, coal,
garbage or driftwood. Especially, do not burn
coal in this stove.
Never Use gasoline type fuel, kerosene,
charcoal lighter fluid, or other liquid fuels or solid
fire starters to start or invigorate the fire. These
fuels can possibly generate carbon monoxide,
which can deplete the supply of oxygen. Keep
all such materials away from the stove.
Never use the stove if the ash pan door is open,
damaged, not in place, or not sealing.
Never use a wood grate or other device to
elevate the fire.
Do Not allow logs to rest against or otherwise
come in contact with the glass when the door is
closed.
Do Not slam the door or use it to force wood in
to the stove.
Never over-fire your stove. (See page 21)
Never put articles of clothing or candles on a hot
stove.
Do Not connect the stove to a flue that is
serving another appliance. (See page 14)
Other safety guidelines
Keep all combustible items such as furniture,
drapes, clothing, and other items, at least 36"
(0.92 m) from the stove (See page 10)
Install a smoke detector, preferably in an area
away from your wood stove.
Keep a fire extinguisher handy. We recommend
the type rated "A B C."
Dispose of ashes properly. (See page 22)
Keep children and pets away from the stove;
they could be burned by touching a hot stove.
Clean your chimney system as needed. (See
page 18)

6
Periodic Checklist
Perform each of these tasks at the specified
intervals.
At the End of Every Week:
Empty ashes from the firebox and ash pan,
sooner if the firebox or the ash pan begin to fill
up.
At the Beginning of Every Other Month:
A visual inspection of the chimney connector
and chimney for creosote is recommended
depending upon the use of your stove. (Please
see page 18-Creosote Formation and Need For
Removal)
Check door seals using the "dollar bill test." -
When the fire is out and the stove is cool, shut
the door on a dollar bill. If the bill pulls out
without any resistance, then your stove’s door
isn't sealed properly. To tighten the seal,
change the door gasket. (Refer to page 18 –
Gaskets)
At the End of Every Season:
Dismantle the chimney connector and clean it
thoroughly. Replace any pieces that show signs
of rust or deterioration.
Inspect and, if necessary, clean your chimney.
Thoroughly clean out the inside of the stove.
Inspect all door gasket material and replace if
worn, frayed, cracked or extremely hard.
Thermo-Ceramic Baffle System
To enhance the combustion efficiency and reduce
the emissions of the fire in your stove Hearthstone
developed an advanced THERMO-CERAMIC baffle
system. This system uses a lightweight, durable
ceramic material above the burner tubes to maintain
the high temperatures in the secondary combustion
area and maintain the low emission –high efficiency
combustion you desire. This new technology will not
corrode, rust dissolve or lose its strength, however it
is vulnerable to puncture or cracking due to rough
handling.
PLEASE EXERCISE CARE WHEN LOADING
WOOD OR CLEANING YOUR STOVE, NOT TO
DAMAGE THE THERMO-CERAMIC BAFFLE
Located directly above the burner tubes in the
firebox, this gray sheet of material will break if wood
or cleaning brushes impact it. Be careful when
loading and cleaning your stove to not break this
material. If this piece has been fractured or a hole is
punctured, it will cause the stove to function
improperly. You must replace the board through a
qualified Hearthstone dealer.
Emergency Procedures
If you have a stovepipe or chimney fire, follow these
instructions:
1. Call the fire department –immediately!
2. If the fire is too threatening, leave the area and
wait for the fire department. If not, perform the
next three steps.
3. Close the primary air control. (see page 14)
4. Close the stovepipe damper (if present).
5. Keep the stove front, and ash doors closed!
WARNING: DO NOT ATTEMPT TO PUT OUT A
STOVEPIPE OR CHIMNEY FIRE BY THROWING
WATER ONTO THE STOVE, STOVEPIPE, OR
CHIMNEY. THE EXTREMELY HIGH
TEMPERATURE ASSOCIATED WITH SUCH FIRES
CAN CAUSE INSTANTANEOUS STEAM AND
SERIOUS BODILY HARM.
Once the chimney fire expires, leave the primary air
control closed and let the fire in the stove die out
completely. Do not fire the stove again until the
stove, stovepipe, and chimney are all thoroughly
inspected for any sign of damage. You must correct
any damage before using your stove again.

7
Specifications
Maximum Output: 80,000 BTUs per hour of
cordwood (based on
independent laboratory test
results).
Size Of Heated Area: Up to 2,500 square feet.
Firebox Capacity: 3.2 cubic feet (.091 cubic
meters) or 64 pounds of
wood (The amount and
weight of wood contained
per cubic foot of firebox
volume can vary from 15 to
36 lbs. per cubic foot
depending on type of wood,
moisture content, packing
density and other factors.
As a constant for
comparison and test
purposes, we are assuming
20 lbs. of seasoned
hardwood per cubic foot of
firebox volume).
Maximum Log Length:21" (533 mm) –logs
Soapstone Finish:1 Polished gray soapstone
Castings Finish: Painted black matte and
porcelain enamel colors
Height: 28" (71.1 cm) (not including
flue collar)
Width: 27" (68.6 cm)
Depth: 26 ½” (67.3 cm)
Front Door Size: 18" wide x 12" high
(45.7 x 30.5cm)
Stovepipe Size: 6" (152 mm) diameter
Metal Chimney: 6" (152 mm) inside diameter
Masonry Chimney: 8" x 8" (203 x 203 mm)
(square flue)
Flue Exit: Top exit only
Actual Weight: 550 pounds
Shipping Weight: 585 pounds
Optional Equipment: Outside Air Adapter,
Blower, Rear Heat Shield
1Polished gray soapstone varies from gray to gray-blue, according
to natural composition.
Dimensions:
Figure 1
Figure 2

8
Installation
Unpacking
Hearthstone packages your Mansfield stove with the
greatest care, so that it ships safely. Under certain
circumstances, however, damage can still occur
during transit and handling. When you receive your
stove, unpack it carefully, inspecting your stove and
all parts for damage. Also, ensure that all parts are
included. If any parts are damaged or missing,
please contact your dealer immediately.
Installing Your Stove
First you must decide where your stove will reside.
After choosing an appropriate spot, inspect this
location to ensure that the stove will have enough
clearance to combustible materials that would
surround the stove. These combustibles can include
walls, floor, ceiling, fireplace, and chimney. You
must carefully consider the clearances to all of these
combustibles before actually connecting your stove.
When considering these clearances, also decide the
kind of floor the stove will rest on. Depending on
your floor, you can install your stove as it is, or use a
floor protector.
Use this section to plan how to locate your stove in
your particular location. Consider both the
clearances of the stovepipe and the stove itself to
the surrounding combustibles.
Read this chapter to obtain a sound understanding
of how to properly install your stove.
If you use a close clearance connector pipe, it must
be tested to UL standards and listed. Check the
listing for your pipe for actual clearances. The
diagrams in this manual represent typical
installations, but are specific to the Simpson Dura-
Vent DVL brand. Clearances cannot be reduced
without the use of close clearance connector pipe
and/or by protecting the surfaces per NFPA 211
standards.
Clearances to NFPA 211 Protected
Surfaces
You can reduce the clearances to combustible
surfaces by using any National Fire Protection
Agency (NFPA) approved wall protection system.
Please refer to NFPA 211 for specifications and
complete details. You can obtain this information
directly from NFPA.
National Fire Protection Agency
Batterymarch Park
Quincy, MA 02269
1-800-344-3555
1-617-770-3000
Hearth Requirements & Floor
Protection
If the floor is wood or other combustible flooring, the
stove must be placed on non-combustible floor
protection that extends 16 inches to the front and 8
inches to either side of the front door opening (US).
The floor protector for the stove must have minimum
dimensions of 34” x 40” (864 x 1016 mm) and must
be placed as illustrated here:
Figure 3
*An example of a non-combustible floor protector would be a
hearth constructed with a continuous layer of a listed backer
board (such as Wonder-Board or Durock) used for ember
protection with a tile, brick, slate, or another noon-combustible
facing.
The chimney connector must also have floor
protection under it, and extending 2 inches (50 mm)
beyond each side.
Outside Air Supply
An outside air source may be connected directly to
this stove using the optional outside air kit (PN 90-
53002). The advantage of providing outside air
directly to the stove is that the air used by the stove
for combustion is taken from outside of the
residence rather than from within the room where

9
the stove is located. With outside air supplied
directly to the stove, drafts within the room and air
infiltration within the building are reduced. Use of
the outside air kit may also improve stove
performance in a particularly air-tight house.
The outside air kit for this stove allows for the direct
connection of the stove's air intake to a minimum 3"
(76 mm) diameter duct (supplied by others) which
leads to the outside of the house. When considering
placement of the duct from the outside of the house
to the hearth, keep in mind the need to avoid wiring
and structural members in the wall.
See the following illustrations for all connection
options. Choose the one most convenient. Locate
the termination of the duct on the outside wall of the
structure in such a manner so as to preclude the
possibility of obstruction by snow, leaves or other
material. Screen the opening against animals and
insects (any screen, duct, clamps, and hood
supplied by others).
Figure 4

10
Clearances To Combustibles
Use this section to plan the layout for your stove.
Consider clearance of connector, and chimney pipe
to combustibles and stove to combustibles. More
specifics on installation follow.
You must follow minimum clearances for the
Mansfield stove to combustibles such as walls and
ceilings. You may reduce the general clearances if
installing the stove near Protected Surfaces (see the
following diagrams and the table on page 11).
Figure 5
Figure 6
Figure 7
Figure 8
If you use a rear heat shield to obtain reduced
clearances, you must use the optional rear heat
shield manufactured by Hearthstone available
through your local dealer. Close clearance
connector pipe must be tested to UL standards and
listed. Check listings of your pipe for actual
clearances. Shown are measurements typical only
and specific to Simpson Dura Vent DVL brand.
Clearances cannot be reduced without the use of
the rear heat shield and/or with close clearance
connector pipe and/or by protecting the surfaces per
NFPA 211 standards

11
FREESTANDING MINIMUM CLEARANCES TO COMBUSTIBLES (from closest point of stove)
Unprotected Surfaces
Protected Surfaces (NFPA 211)
Parallel
Corner
Parallel
Corner
Installation type
Side
Rear
Side
Rear
No Heat Shield
18 in. (45.7 cm)
19 in.
14 in.
10 in.
12 in.
8 in.
(Optional accessory)
(48.26 cm)
(35.56 cm)
(25.40 cm)
(30.40 cm)
(20.32 cm)
Rear Heat Shield, w/
18 in. (45.7 cm)
16 in. *
14 in.
10 in.
10 in.
7 in.
Single wall connector
(40.64 cm)
(35.56 cm)
(25.40 cm)
(25.40 cm)
(17.78 cm)
Rear Heat Shield, w/
18 in. (45.7 cm)
8 in. *
14 in.
10 in.
8 in.
7 in.
Double wall connector
(20.32 cm)
(35.56 cm)
(25.40 cm)
(20.32 cm)
(17.78 cm)
*These Clearances are from the back of the unit. For clearances to rear heat shield, subtract 2”.
Ask for part # 90-57200 –Mansfield Rear Heat Shield Accessory.
ALLOWABLE ALCOVE DIMENSIONS
Unprotected Surfaces
Protected Surfaces (NFPA 211)
Min.
Width
Max.
Depth
Min. Height
(stove to ceiling above.)
Min. Width
Max.
Depth
Min. Height
(stove to ceiling above.)
63 in.
48 in.
36 in.
48 in.
48 in.
18 in.
(160 cm)
(122 cm)
(91 cm)
(122 cm)
(122 cm)
(46 cm)
MINIMUM CLEARANCES FROM STOVEPIPE TO COMBUSTIBLES (chimney connector)
Connector type
Unprotected Surfaces
Protected Surfaces (NFPA 211)
Single wall connector pipe
18-in. (46 cm)
12-in. (31 cm)
Double wall connector pipe
6-in. (15 cm)**
3-in. (8 cm) **
(**SEE Pipe Manuf. Specs.)
DO NOT CONNECT THIS UNIT TO A CHIMNEY
FLUE SERVING ANOTHER APPLIANCE
Single wall connector is 24 MSG or 25 MSG
blued steel stove pipe.
Double wall connector (close clearance pipe)
which must be used with a listed factory-built
“Type HT" chimney and may also be used with a
masonry chimney to reduce clearances, is
available from several manufacturers, your
dealer can help you choose. Some air insulated
connector pipe models available are Simpson
Dura Vent DVL and Metalbestos DS. Security,
GSW and Ameritec also have acceptable close
clearance connector pipe.
When used in a mobile home, a spark arrester is
required.
Chimney connector shall not pass through floor
or ceiling, nor any attic or roof space, closet or
similar concealed space. Where passage
through a wall or partition of combustible
construction is desired, the installation shall
conform with NFPA 211 or CAN/CSA - B365.
It is very important to follow minimum clearances for
chimney connectors to combustibles such as walls,
ceilings, and when installing the stove near non-
combustible surfaces. Typical chimney connector
clearances are outlined below. The single wall
clearances are generic, the Double wall clearances
are for Simpson Dura Vent DVL.
ALWAYS CHECK THE CLEARANCE SPECIFICATIONS
FROM THE MANUFACTURER OF YOUR CONNECTOR
PIPE
DO NOT CONNECT THE VENT TO ANY AIR
DISTRIBUTION DUCT OR AIR HANDLING SYSTEM.

12
Figure 9

13
Venting Components & Configuration
Components of a Venting System
The complete venting system consists of several
components: chimney connector, wall thimble, wall
pass-through, chimney, and liner. It is absolutely
necessary that you install all of these components
within the clearances to combustibles discussed
earlier to install your stove safely.
To protect against the possibility of a house fire, you
must properly install and constantly maintain the
venting system. Upon inspection, immediately
replace rusted, cracked, or broken components.
The chimney connector is the stovepipe from the
woodstove to the chimney. The chimney
connector stovepipe must be 6" (152 mm)
diameter, 24 MSG or 25 MSG blued steel
connector pipe. Do not use aluminum or
galvanized steel pipe - they cannot withstand the
extreme temperatures of a wood fire.
A thimble is a manufactured (or site-constructed)
device installed in combustible walls through
which the chimney connector passes to the
chimney. It keeps the walls from igniting. You
must use a wall thimble when installing a
chimney connector through a combustible wall
to the chimney.
A wall pass-through (or chimney support
package) also keeps the walls from igniting.
You must use one when connecting through a
wall or ceiling to a prefabricated chimney.
Only install this stove to a lined masonry
chimney or an approved high temperature
prefabricated residential type building heating
appliance chimney. Do not connect this stove to
a chimney serving another appliance; you will
compromise the safe operation of both the wood
stove and the connected appliance.
WARNING: DO NOT CONNECT THIS APPLIANCE
TO ANY AIR DISTRIBUTION DUCT OR SYSTEM.
A liner is the UL 1777 or ULC S635 (for factory
built fireplace or masonry) chimney.
You must connect your stove to a chimney
comparable to those recommended in this manual.
Do not use stovepipe as a chimney. Use stovepipe
for freestanding installations only to connect the
stove to a proper chimney.
Installing a Venting System
Stovepipe sections must be attached to the stove
and to each other with the crimped end toward the
stove. If creosote builds up, this allows the creosote
to run into the stove and not the outside of the
stovepipe and onto the stove.
Secure all joints, including attaching the stovepipe to
the stove's flue collar, with three sheet metal screws.
Install #10 x 1/2" (3 mm x 13 mm) sheet metal
screws into the holes pre-drilled in the flue collar.
Leaving off the screws can cause joints to separate
from the vibration that results from a creosote
chimney fire.
You can simplify connecting stovepipe by using
additional accessories such as telescoping pipes,
slip-connectors or clean-out tees. These
accessories ease the inspection of your chimney, as
well as allow you to easily dismantle the stovepipe
(without moving the stove) when you periodically
inspection the stovepipe connection and chimney.
Install the stove as close as practical to the chimney,
while maintaining all proper clearances. Install
stovepipe that is as short and as straight as
possible. Horizontal runs of stovepipe should
always rise away from the stove a minimum of 1/4"
per foot (21mm/m).
Long runs of stovepipe to increase heat dispersal
are not recommended. Using longer lengths of
stovepipe or more connecting elbows than
necessary increase the chances of draft resistance
and the accumulation of creosote buildup.
In general, you do not need to install a stovepipe
damper with the Mansfield. Some installations,
however, could benefit from a stovepipe damper,
such as a tall chimney which can create a higher
than normal draft. In such cases, a damper can help
regulate the draft. The Mansfield requires a draft
between 0.06" wc and 0.1" wc. For drafts above
0.1" wc, install a stovepipe damper.
Remember, the NFPA has recommended minimum
clearances for chimney connectors to combustibles
such as walls and ceilings. Once the stove is
installed at safe distances from these combustible
surfaces, it is important to maintain these connector
clearances for the remainder of the installation.

14
Connecting Your Wood Stove
You can install your Mansfield to a prefabricated
metal chimney or a masonry chimney.
Connecting to a Prefabricated Metal
Chimney
When connecting the Mansfield to a prefabricated
metal chimney, you must follow, precisely, the
manufacturer's installation instructions. Use only
Type HT (2100 deg. F), prefabricated metal
chimneys listed per UL 103 or ULC S629 standards.
WARNING: DO NOT CONNECT THE STOVE
TO A CHIMNEY FLUE SERVING ANOTHER
APPLIANCE.
Ensure the size of the chimney’s flue is appropriate
for the Mansfield. The Mansfield requires a 6” (152
mm) inside diameter flue for new installations. A 6”
diameter flue provides adequate draft and
performance. You can use an 8” (203 mm) diameter
existing flue with a reducer. An oversized flue
contributes to creosote accumulation. (In this case,
bigger is NOT better.)
When purchasing a prefabricated chimney to install
with your stove, be sure to also purchase from the
same manufacturer the wall pass-through (or ceiling
support package), "T" section package, fire-stops
(when needed), insulation shield, roof flashing,
chimney cap, and any other needed accessories.
Follow the manufacturer’s instructions when
installing the chimney and accessories. In addition,
be sure to maintain all manufacturer’s
recommendations for the proper clearances to the
chimney.
There are basically two ways to install a
prefabricated metal chimney:
1. An interior installation where the chimney
passes inside the residence through the ceiling
and roof.
2. An exterior installation where the chimney
passes through the wall behind the stove then
up the outside of the residence.
Whenever possible, choose an interior chimney. An
interior chimney heats up more quickly and retains
its heat; thus promotes a better draft and
discourages the formation of creosote. An exterior
chimney does not benefit from the warmth of being
surrounded by the building, so it typically operates at
lower flue temperatures than an interior chimney.
An exterior chimney’s draft is not as strong and may
experience increased creosote accumulation.
Figure 10
Figure 11

15
Figure 12
Connection to a Masonry Chimney
Consider two primary elements when connecting
your stove to a masonry chimney: the chimney itself
and the thimble where the stovepipe connects to the
chimney. Use only Code approved masonry
chimneys with a flue liner. See figure 13 for
instructions on installing a thimble into a masonry
chimney or masonry fireplace.
Before connecting to a masonry chimney, hire a
professional to examine the chimney for cracks,
loose mortar, and other signs of deterioration and
blockage. If the chimney needs repair, complete
them before installing and using your stove. Do not
install your stove until the chimney is safe for use.
Make sure the chimney’s cleanout is complete and
working properly. To avoid a loss of draft, the
cleanout must close off completely. If not, the
chimney will cool, your stove will perform poorly, and
creosote will build up in the chimney.
Make sure the size of the chimney’s flue is
appropriate for this stove and that it is not too large.
Use a masonry chimney with an 8” x 8” (203 mm x
203 mm) tile size for best results. An oversized flue
will contribute to the accumulation of creosote.
Minimum Requirements:
At least 3’ (0.91 m) higher than highest part of roof
opening through which it passes and at least 2’ (0.61
m) higher than any part of the roof within 10’ (3 m).
Use the following checklist to ensure that your
masonry chimney meets these minimum
requirements:
Chimney wall construction:
Brick or modular block at least 4” (102 mm)
thick.
A rubble or stone wall at least 12” (305mm)
thick.
Flue liner:
Minimum thickness of 5/8” (16 mm).
Installed with refractory mortar.
At least 1” (25 mm) air space.
An equivalent flue liner must be a listed chimney
liner system meeting type HT requirements or
other approved material.
Interior chimney requirements:
At least 2” (51 mm) clearance to combustible
structure
Fire stops must be installed at the spaces where
the chimney passes through floors and/or
ceiling.
Insulation must be 2” (51 mm) from the chimney.
Exterior chimney requirements:
At least 1” (25 mm) clearance to combustible
structure.
Chimney height requirements for both
prefabricated metal and masonry chimneys: (See
Figure 13)
At least 3 feet (0.9 m) higher than the highest
part of the roof opening through which it passes.
At least 2 feet (0.6 m) higher than any part of the
roof within 10 feet (3 m) measured horizontally
from the top of the chimney.
This stove requires a minimum chimney height of 13
feet (4 m). The maximum allowable chimney height
is 30 feet (9m).

16
Figure 13

17
Figure 14
Installing In a Mobile Home
Follow these special requirements for installing your
stove in a mobile home.
Install the stove in accordance with 24 CFR,
Part 3280 (HUD)
Permanently attach the stove to your mobile
home’s floor. Use 3/8” holes in each leg base
to bolt down the stove.
Install one of the following Dura-Vent Mobile
Home Chimney & Connector Kits:
o6DP-MH 6” Diameter S/N 9096N
o7DP-MH 7” Diameter S/N 9196N
o8DP-MH 8” Diameter S/N 9296N
Each kit includes:
Stainless spark arrester cap, storm collar, adjustable
vented flashing –0/12 –6/12, two 24” Dura/Plus*
chimney pipes, and a 24” support box with built-in
starter section and trim.
* (UL or ULC approved equipment is acceptable)
CHIMNEY MUST BE REMOVED WHEN
TRANSPORTING MOBILE HOME.
WARNING: DO NOT INSTALL IN A SLEEPING
ROOM
CAUTION: MAINTAIN THE STRUCTURAL
INTEGRITY OF THE MOBILE HOME WALLS,
FLOOR, CEILING, AND ROOF WHILE YOUR
STOVE IS INSTALLED AND IN USE.
Figure 15

18
Operation
Once your Mansfield is set in place, connected, and
assembled, you are ready to light a fire.
Hearthstone tests each wood stove before we ship,
so you should be able to easily light your first fire.
WARNING: HOT WHILE IN OPERATION. KEEP
CHILDREN, CLOTHING AND FURNITURE AWAY.
CONTACT MAY CAUSE SKIN BURNS.
Please read this entire chapter before lighting your
first fire. It explains the controls and features of your
wood stove, how to choose firewood, and how to
break-in your stove and use it on a daily basis.
Controls & Features
Before lighting any fires, become familiar with the
location and operation of your stove's controls and
features and learn how to use them. For your own
safety, do not modify these features in any way.
FRONT DOOR HANDLE:A fixed handle is
provided to operate the front loading door. The 10
o’clock position is open; the 7 o’clock position is
closed. Pull on the door handle to make sure it is
properly latched. Be sure to keep the front door
closed during normal operation. Failure to do so
could allow carbon monoxide to leak into the room.
Extended exposure to carbon monoxide could result
in bodily injury or even death.
PRIMARY AIR CONTROL: This feature is located
on the lower left side of the stove, under the
removable ash lip. The primary air control allows
you to regulate the amount of air entering the
firebox. Generally, the more air allowed into the
firebox, the faster and hotter the rate of burn;
conversely, less air creates a slower burn. Push the
lever to the left to open the primary air control; push
the lever to the right to close the primary air control.
ASH PAN:The ash pan access door is located
under the ash lip. The ash pan collects burned ash
from a fire and allows you to conveniently remove
the ash from your wood stove. To open the door,
rotate the handle counter clock-wise. Clean the
firebox of ashes as required by sliding the ash grate
open, sifting the ashes across the grate into the ash
pan, then returning the grate to its closed position.
The ash pan is easy to remove and has a handle for
convenient disposal of ashes. Once you remove the
ashes, close the ash pan access door and rotate the
handle clock-wise to latch.
Figure 16

19
Choosing Firewood
Burn only natural firewood (known as cordwood)
in the Mansfield 8011 Woodstove. This stove is
not designed to burn other fuels.
CAUTION: DO NOT USE CHEMICALS OR
FLAMMABLE FLUIDS TO START THE FIRE. DO
NOT USE CHARCOAL, PELLETS, COAL,
ARTIFICIAL LOGS OR ANY OTHER MATERIALS
AS FUEL; THEY ARE NOT SAFE. DO NOT BURN
GARBAGE OR FLAMMABLE FLUIDS.
The quality of your firewood directly affects heat
output, duration of burn and performance of your
stove. Softwoods generally burn hotter and faster,
while hardwoods burn longer and produce better
coals. Density and moisture content are two critical
factors to consider when purchasing wood for your
stove.
The following is a list of some wood species and
their relative BTU (British Thermal Unit) content. The
higher the BTU content, the longer the burn.
Firewood with higher BTUs is generally ideal for a
wood stove.
Wood Heat Value: Sorted By Btu
Content
Common Name
Lb/ cord
MBTU/
cord
High
Osage Orange (Hedge)
4,728
32.9
Hickory, Shagbark
4,327
27.7
Hop Hornbeam (Ironwood)
4,267
27.3
Beech, Blue (Ironwood)
3,890
26.8
Birch, Black
3,890
26.8
Locust, Black
3,890
26.8
Hickory, Bitternut
3,832
26.7
Locust, Honey
3,832
26.7
Apple
4,100
26.5
Mulberry
3,712
25.8
Oak, White
4,012
25.7
Medium High
Beech, European
3,757
24
Maple, Sugar
3,757
24
Oak, Red
3,757
24
Ash, White
3,689
23.6
Birch, Yellow
3,689
23.6
Medium
Juniper, Rocky Mtn
3,150
21.8
Elm, Red
3,112
21.6
Coffeetree, Kentucky
3.112
21.6
Hackberry
3,247
20.8
Tamarack
3,247
20.8
Birch, Gray
3,179
20.3
Birch, White (Paper)
3,179
20.3
Walnut, Black
3,192
20.2
Cherry
3,120
20
Ash, Green
2,880
19.9
Cherry, Black
2,880
19.9
Elm, American
3,052
19.5
Elm, White
3,052
19.5
Sycamore
2,808
19.5
Ash, Black
2,992
19.1
Maple, Red
2,924
18.7
Fir, Douglas
2,900
18.1
Medium Low
Boxelder
2,797
17.9
Alder, Red
2,710
17.2
Pine, Jack
2,669
17.1
Pine, Norway (Red Pine)
2,669
17.1
Pine, Pitch
2,669
17.1
Catalpa
2,360
16.4
Hemlock
2,482
15.9
Spruce, Black
2,482
15.9
Pine, Ponderosa
2,380
15.2
Low
Aspen, American
2,290
14.7
Butternut (Walnut, White)
2,100
14.5
Spruce
2,100
14.5
Willow
2,100
14.5
Fir, Balsam
2,236
14.3
Pine, White (Eastern,
Western)
2,236
14.3
Fir, Concolor (White)
2,104
14.1
Basswood (Linden)
2,108
13.8
Buckeye, Ohio
1,984
13.8
Cottonwood
2,108
13.5
Cedar, White
1,913
12.2
Moisture content also plays a key role in the
performance of your stove. Wood freshly cut from a
living tree (green wood) contains a great deal of

20
moisture. As you might expect, green wood burns
poorly. You must season green wood before using it
in your wood stove. To season green wood properly,
split, stack, and allow it to air dry for a period of one
year. Green wood may provide less than 2000 Btu
per pound, whereas dry wood can provide up to
7000 Btu per pound.
Stack the firewood on skids or blocks to keep it off
the ground, cover only the top of the stack. Plastic or
tarps that cover the sides of the woodpile trap
moisture and prevent the wood from drying. As for
stacking, an old Vermonter said, "The spaces
between the logs should be large enough for a
mouse to get through, but not for the cat that's
chasing it."
CAUTION: DO NOT STORE FIREWOOD WITHIN
THE STOVE'S SPECIFIED CLEARANCES TO
COMBUSTIBLE MATERIALS.
Building A Fire
Once you understand the controls of your wood
stove and have the appropriate firewood, you are
ready to start a fire.
WARNING: NEVER USE GASOLINE, GASOLINE-
TYPE LANTERN FUEL, KEROSENE, CHARCOAL
LIGHTER FLUID, OR SIMILAR LIQUIDS TO START
OR 'FRESHEN UP' A FIRE IN THIS HEATER.
KEEP ALL SUCH LIQUIDS WELL AWAY FROM
THE HEATER WHILE IT IS IN USE.
Breaking In Your Wood Stove
It is imperative that your stove is "broken in" slowly.
Cast iron must be "seasoned"; over-firing a new
stove may cause castings to crack or may damage
other stove parts. Driving moisture out of the
soapstone slowly minimizes the “shock” to the stone
at its first exposure to high firebox temperatures.
Also, curing the asbestos-free furnace cement slowly
ensures adequate sealing and bonding.
The bottom layer of soapstone in your firebox is
intended to prevent thermal stress and should
remain in place in the firebox at all times.
When you light your first fires, the woodstove will
emit some smoke and fumes. This is normal “off-
gassing” of the paint used when manufacturing the
woodstove. If you find it necessary, open a few
windows to vent your room. The smoke and fumes
will usually subside after 10 to 20 minutes of
operation. The odor and smoke will end once the
stove is “cured”.
The first few fires of the season may produce other
odors from impurities that exist in the area
immediately surrounding the stove. Some potential
impurities are cleaning solvents, paint solvents,
cigarette smoke, and soot from scented candles, pet
hair, dust, adhesives, a new carpet, and new
textiles. These odors will dissipate over time. You
can alleviate these odors by opening a few windows
or otherwise creating additional ventilation around
your stove. If any odor persists, contact your dealer
or an authorized service technician.
Building a Break-In Fire
1) Open the door and place five or six double
sheets of tightly twisted newspaper in the center
of the firebox. Arrange kindling in a crisscross
pattern over the newspaper. Kindling should be
approximately ten pieces, 1/2" (13 mm) in
diameter and 10" to 18" (254 mm to 457 mm)
long.
2) Fully open the primary air control by pushing the
lever to the left.
3) Light the paper under the kindling. Leave
the front door slightly ajar momentarily until the
kindling has started to burn and draft begins to
pull.
4) Close the door and allow the fire to burn. Keep
the door and ash drawer closed while the stove
is in use. Make sure the ash door is in the
closed position.
5) KEEP A WATCHFUL EYE ON YOUR STOVE to
maintain a steady, low-heat fire. Your first fire
should make the stove warm but not hot to the
touch. At most, a few small chunks of wood
should be added to the fire to reach safe break-
in temperatures.
6) Once the stove is warm but not hot to the
touch close the primary air control and allow the
fire to die out completely.
7) Let the stove return to room temperature.
Your first fire and first fire each season thereafter
should be built and maintained as outlined above.
Your patience will be rewarded by a properly
seasoned stove.
NOTE: Because of the cool flue gas
temperatures present during the break-in
procedure, creosote may build up quickly. Your
window may also get dirty. A good hot fire will
clean it.
If you adhere to the operating procedures in this
manual, the steel, cast iron, stone and refractory
components of your stove will give you many years
of trouble-free use. With use, the color of the