HearthStone 8491 User manual

Hearthstone Quality Home Heating Products, Inc. ®
Clydesdale Model 8491
Manual: 6400-40462
Revision: 10 - 9/22/2009
Clydesdale
(Model 8491)
Non-Catalytic, Wood Burning
FireplaceInsert
OWNER'S MANUAL
INSTALLATION & OPERATING
INSTRUCTIONS
Please read this entire owner’s manual before you install and use your new Clydesdale wood
burning fireplace insert. 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, Restrictions, and Installation Inspection Required in Your Area.

Hearthstone Clydesdale Fireplace Insert Model 8491
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Hearthstone Clydesdale Fireplace Insert Model 8491
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Table of Contents
INTRODUCTION ..........................................................................................................................................................4
CODES......................................................................................................................................................................4
SAFETY INFORMATION ...............................................................................................................................................5
PERIODIC CHECKLIST ................................................................................................................................................6
EMERGENCY PROCEDURES........................................................................................................................................6
SPECIFICATIONS........................................................................................................................................................7
INSTALLING YOUR WOOD FIREPLACE INSERT .............................................................................................................8
Unpacking ......................................................................................................................................................................8
Hearth Requirements & Floor Protection .......................................................................................................................9
Clearances to NFPA 211 Protected Surfaces ................................................................................................................9
Clearance to combustibles.............................................................................................................................................9
Installing the Insert.......................................................................................................................................................10
Installing the surround..................................................................................................................................................14
Removing & Reversing the Door..................................................................................................................................14
Removing the Ash Lip Cover & Façade .......................................................................................................................15
Blower Power Cord Routing.........................................................................................................................................16
VENTING COMPONENTS &CONFIGURATION..............................................................................................................17
Installing a Venting System..........................................................................................................................................17
Connecting Your Wood Fireplace Insert ......................................................................................................................17
Connecting to a Prefabricated Metal Chimney.............................................................................................................17
Connection to a Masonry Chimney ..............................................................................................................................18
OPERATION.............................................................................................................................................................21
Controls & Features .....................................................................................................................................................21
Operating the Blower ...................................................................................................................................................21
Choosing Firewood ......................................................................................................................................................21
Hearthstone’s Thermo-Ceramic Baffle System ............................................................................................................22
Building a Fire ..............................................................................................................................................................22
Breaking in Your Wood Fireplace Insert.......................................................................................................................22
Operating Your Insert Efficiently ..................................................................................................................................23
Intermittent Operation ..................................................................................................................................................24
Building a Fire for Everyday Use..................................................................................................................................24
Disposal of Ashes ........................................................................................................................................................25
Over-Fire Caution.........................................................................................................................................................25
MAINTENANCE.........................................................................................................................................................26
Creosote Formation and Need for Removal.................................................................................................................26
Gaskets........................................................................................................................................................................26
Glass............................................................................................................................................................................26
Cast Iron ......................................................................................................................................................................27
Blower System .............................................................................................................................................................28
TROUBLESHOOTING.................................................................................................................................................29
Basic Heating Issues....................................................................................................................................................29
Troubleshooting Guide.................................................................................................................................................30
REPLACEMENT PARTS &OPTIONAL ACCESSORIES...................................................................................................31
SAFETY LABEL........................................................................................................................................................32
LIMITED WARRANTIES .............................................................................................................................................33

Hearthstone Clydesdale Fireplace Insert Model 8491
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Introduction
Congratulations! You have just invested in a most
unique wood burning Fireplace Insert – the
Clydesdale Model 8491 is a clean burning EPA
certified, non-catalytic wood burning Fireplace
Insert. You can be proud to join the Hearthstone
family with our Premier Cast Iron Wood Burning
Fireplace Insert. The generous firebox depth and
width allows for loading of wood up to 22 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 Fireplace Insert. The
Clydesdale blends modern technology with the
unique beauty and heating qualities of soapstone
(used as the firebox lining) and cast iron. Soapstone
is well known 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 Fireplace Insert's safe
installation, proper break-in, operation and
maintenance. It contains information that is useful to
you now, and in the 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 Fireplace Insert.
Ensure to maintain the designated stovepipe and
Fireplace Insert 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.
Keep furniture, drapes, curtains, wood, paper, and
other combustibles far away from the Fireplace
Insert. Never install the Fireplace Insert in a location
where gasoline, kerosene, charcoal lighter fluid or
other flammable liquids are used or stored.
SAFETY NOTICE:
A HOUSE FIRE MAY RESULT IF THIS
FIREPLACE INSERT IS NOT INSTALLED
PROPERLY. FOR YOUR SAFETY, CAREFULLY
FOLLOW THE INSTALLATION INSTRUCTIONS.
CONTACT LOCAL BUILDING OR FIRE
OFFICIALS ABOUT RESTRICTIONS AND
INSTALLATION INSPECTION IN YOUR AREA.
The performance of your Fireplace Insert 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 Fireplace Insert is manufactured and warranted
by:
Hearthstone Quality Home Heating Products, Inc®
317 Stafford Ave.
Morrisville, VT. 05661
www.hearthstonestoves.com
Codes
When you install your Clydesdale wood Fireplace
Insert, 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
www.ansi.org
National Fire Protection Association, Inc.
(NFPA)
Battery March Park
Quincy, MA 02269
http://www.nfpa.org

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Safety Information
Read and understand this Owner's Manual
thoroughly before installing and using this
Fireplace Insert.
Make sure to install your Fireplace Insert:
According to the manufacturer's
recommendations.
In accordance with all applicable codes.
With the proper sized chimney.
When using your Fireplace Insert:
Warn children and others unfamiliar with
woodstoves of the danger of touching hot,
radiating surfaces of your Fireplace Insert. 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.
Inspect the stovepipe, chimney connector and
chimney, as recommended.
Follow these safety precautions:
Never modify this Fireplace Insert 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, plastic, artificial logs, cardboard,
coal, or driftwood. Especially, do not burn
coal in this Fireplace Insert.
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 sap the supply of oxygen. Keep all
such materials away from the Fireplace Insert.
Never use a log 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 the door to force
wood in to the Fireplace Insert.
Never over-fire your Fireplace Insert
Never put articles of clothing or candles on a hot
Fireplace Insert.
Do Not connect the Fireplace Insert to a flue
that is serving another appliance.
Other safety guidelines
As a general rule, keep all combustible items
such as furniture, drapes, clothing, and other
items, at least 36" (0.92 m) from the Fireplace
Insert
Install a smoke detector, preferably in an area
away from your wood Fireplace Insert.
Install a CO detector as a rule. Wood burning
appliances can generate little CO, but oil and
gas burning appliances can produce huge
amounts if not operating properly.
Keep a fire extinguisher handy. We recommend
the type rated "A B C."
Dispose of ashes properly.
Keep children and pets away from the stove;
they could be burned by touching a hot stove.
Clean your chimney system as needed.

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Periodic Checklist
Perform each of these tasks at the specified
intervals.
At the End of Every Week:
Empty ashes from the firebox (sooner if the
firebox begins to fill up).
At the Beginning of Every Other Month:
A visual inspection of the flue liner or chimney
for creosote is recommended depending upon
your use of the stove.
Check door seals using the "dollar bill test." -
When the fire is out and the insert is cool, shut
the door on a dollar bill. If the bill pulls out
without any resistance, then your insert’s door
isn't sealed properly. To tighten the seal, adjust
the latch spring tension or change the door
gasket if necessary.
At the End of Every Season:
Clean any chimney connector thoroughly.
Replace any pieces that show signs of rust or
deterioration.
Inspect and, if necessary, clean your chimney
(flue liner).
Thoroughly clean out the firebox of the Fireplace
Insert.
Inspect all door gasket material and replace if
worn, frayed, cracked or extremely hard.
Replace any badly cracked refractory soapstone
in the firebox.
Clean dust away from the ash lip assembly and
grills.
Remove the Ash Lip Cover and inspect the
blower assembly - clean if necessary.
Emergency Procedures
If you have a stovepipe or chimney fire, follow these
instructions:
1. If the fire is too threatening, leave the area and
call the fire department immediately! If not,
perform the next two steps.
2. Close the primary air control.
3. Keep the Fireplace Insert door 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 has expired, leave the primary
air control closed and let the fire in the Fireplace
Insert die out completely. DO NOT burn the
Fireplace Insert again until the Fireplace Insert,
connector pipe, liner, and chimney are all thoroughly
inspected for any sign of damage. You must correct
any damage before using your Fireplace Insert
again.
To remove the Clydesdale for inspection purposes,
disconnect the venting from inside the firebox.
Carefully remove the surround from the insert, and
slide the insert away from the fireplace.

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Specifications
Maximum Heat Output: 60,000 BTU per hour of
cordwood (based on independent laboratory test
results).
Size of Heated Area: 1,600 square feet.
Firebox Capacity: 2.4 cubic feet or 48 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: 22” (55.88 cm)
Height: 23.12" (58.72 cm)
Width: 31.62” (80.31 cm)
Depth: 24.63” (62.56 cm)
Front Door Size: 22" wide x 11.5" high
(55.88 x 29.21 cm)
Stovepipe Size: 6" (152 mm) diameter
Metal Chimney: 6" (152 mm) inside diameter
Masonry Chimney: 6” (15.2cm) inside diameter
(round flue)
8” x 8” (20 x 20cm) (square
flue)
Flue Exit: Top exit only
Actual Weight: 550 pounds
Castings Finish: Painted Matte; and Porcelain
Enamel
Figure 1 – Clydesdale Dimensions

Hearthstone Clydesdale Fireplace Insert Model 8491
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Installing Your Wood Fireplace Insert
Unpacking
Hearthstone packages your Clydesdale Fireplace
Insert 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 Fireplace Insert, unpack it carefully,
inspecting it, and all parts for damage. Also, ensure
that all parts are included. If any parts are damaged
or missing, please contact your dealer immediately.
Pre-Installation Prep
When installing this unit in a fireplace, you must
attach the provided metal label (3300-625) to the
fireplace prior to installing the insert (see illustration
on page 17).
Ensure that the Fireplace Insert will have enough
clearance to combustible materials in the vicinity.
These combustibles can include walls, floor, ceiling,
fireplace mantle, and chimney decor. You must
carefully consider the clearances to all of these
combustibles before actually connecting your
Fireplace Insert.
Read this chapter to obtain a sound understanding
of how to properly install your Fireplace Insert.
Contact the following agency for more information:
National Fire Protection Agency
Batterymarch Park
Quincy, MA 02269
1-800-344-3555
1-617-770-3000
www.nfpa.org
Figure 2 – Minimum Fireplace Dimensions

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Hearth Requirements & Floor
Protection
Combustible flooring must be protected with a
covering of noncombustible material (slate, marble
tiles, other noncombustible material can be used for
this purpose). The floor protection must extend
beyond the body of the Fireplace Insert at the
minimum as follows and have a minimum “R-Value”
of 1.1.
Figure 3 – Hearth Requirements
Installations in Canada require 18” (45.72 cm) of
floor protection in the front.
Noncombustible Material Thickness R-value
Gypsum or plaster board11/2″0.45
Wallboard, Wonderboard, or
Durock1
1/2″0.20
Ceramic board (Fiberfrax or
Micor)1
1/2″1.10
Nominal solid clay brick11″0.20
Ceramic wall or floor tile11/4″0.01
Mineral wool insulation21″3.12
Cement mortar21″0.20
Horizontal still air2*1/8″0.92
Floor protector’s come with various types of
specifications. To convert a floor protector’s
specification to an R-value, do one of the following:
1. If the R-value is given, use that value - no
conversion is needed.
2. If a K-factor is given with a required thickness (T)
in inches, use this formula: R-value = 1/K x T
3. If a C-factor is given, use the formula: R-value =
1/C
1According to Intertek Testing Services, Inc.
2According to ASHRAE Handbook of Fundamentals 1977
To determine the R-value of the proposed alternate
floor protector:
1. Use either the K-factor or the C-factor formula
explained above to convert specifications not
expressed as R-values.
2. For multiple layers of floor protectors, simply add
the R-values of each layer to determine the
overall R-value of the layers.
If the overall R-value of your setup is greater than the
R-value of the specified floor protector, then your
setup is acceptable.
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.
Refer to NFPA 211 for specific and complete details:
National Fire Protection Agency
Battery March Park
Quincy, MA 02269
1-800-344-3555
1-617-770-3000
www.nfpa.org
Clearance to combustibles
figure 4 – clearances to combustibles
A- Side wall = 12”
B- Mantle and top trim = 27” *
B- Mantle/ with mantle shield kit = 11” *
C-Trim =9”
*Measured from top of sheet metal shroud

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Installing the Insert
Step One: Remove the contents of the firebox. This
will include the owner’s manual, a box of soapstone
refractory bricks, and the handle knob assembly.
Step Two: Remove the Clydesdale from the pallet
(see Photo 2).
Locate the three mounting clips attached to the
leveling bolts (two in the front and one in the back)
that secure the insert to the shipping pallet.
1. Using a 1/2” wrench, remove the rear lag
screw and mounting clip.
2. Check the front clips – if there is sufficient
clearance above the lag screws to clear the
facade, remove them.
3. Otherwise, if the lag screw is close to and
under the façade (see photo 1), carefully
loosen the front clip lag screws about one
turn. Take care to not damage the finish on
the façade.
4. Slide the insert backwards about one inch to
disengage the front clips.
The Insert ships with the Façade and ash lip cover
installed. You should not need to remove these in a
typical installation.
Photo 1 – Pallet Mounting Clip Detail (Right Front
Shown - Façade Installed)
Step Three: Install the wooden knob onto the latch
handle. The knob, bolt, and washer are located in a
plastic bag removed from the firebox in step one.
Place the washer onto the bolt and then push the bolt
through the knob. Turn the bolt onto the latch handle
and tighten with a hex wrench. Handle is shown
installed correctly in photo 2.
Photo 2 – Door Handle & Latch Detail (Façade
removed)
Step Four: Measure the opening of the fireplace.
When measuring the fireplace cavity, you will need to
determine the following:
1. Will the flue collar be installed in the forward
or aft position? The depth of the firebox will
determine the location of the flue collar.
NOTE: the collar is installed at the factory in
the aft position to accommodate the most
common type of install that requires use of
an elbow or flex connector for attachment to
the chimney liner. To change the collar to
the forward position for a shallow fireplace,
follow the instructions in step five. Proceed
to the next step if the aft position is correct
for your installation.
Reversable Flue
(Front-Back)
This end up !
3/8"
Medium
density
gasket
Figure 5 – Flue Collar Detail
2. Note: With the collar is in the aft position - to
properly attach the liner or connector to the
flue collar using all three screws, you must