HearthStone WFP-75 User manual

WFP-75 Model 8410
Manual: 6400-40481
R: 1 – 6/22/2012
WFP-75
(Model 8410)
Wood Fireplace
OWNER’S MANUAL
Installation And
Operating Instructions
Listed to standards
ULC-S610 and UL-127
Manufactured for: HearthStone Quality Home Heating Products, Inc.
317 Stafford Avenue, Morrisville VT 05661
PLEASE READ THIS ENTIRE OWNER’S MANUAL BEFORE YOU INSTALL
AND USE YOUR NEW WFP-75 FIREPLACE.
SAVE THIS OWNER’S MANUAL FOR FUTURE REFERENCE
CAUTION: Do not attempt to modify or alter the construction of the replace or
its components. Any modication or alteration of construction may void the
warranty, listings and approvals of this system. In that case, HearthStone Quality
Home Heating Products, Inc. will not be responsible for damages. Install the
replace only as described in these instructions.
This manual is available for free download on the manufacturer’s web site. It is a
copyrighted document. Re-sale is strictly prohibited. The manufacturer may update this
manual from time to time and cannot be responsible for problems, injuries, or damages
arising out of the use of information contained in any manual obtained from unauthorized
sources.

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 8410

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 8410i
TABLE OF CONTENTS
Page
1. SAFETY RULES FOR OPERATING YOUR FIREPLACE .................................... 1
2. THE FIREPLACE ................................................................................................ 3
2.1 INTRODUCTION ................................................................................................ 3
2.1.1 Parts Required ......................................................................................... 3
2.1.2 Additional Equipment (optional) ............................................................... 3
2.2 OPERATING THE WFP-75 ................................................................................. 4
2.2.1 Fuel ............................................................................................................ 4
2.2.2 The Use of Manufactured Logs ................................................................... 4
2.2.3 First Fires ................................................................................................... 5
2.2.4 Building a Fire ............................................................................................ 5
2.2.5 Maintaining the Fire.................................................................................... 5
2.2.6 Primary Air ................................................................................................. 6
2.2.7 Combustion Settings ................................................................................. 7
2.2.8 Smoking: Causes and Troubleshooting ................................................... 7
A. Negative pressure in the house.................................................................. 8
B. Fans operating (e.g.: range hood).............................................................. 8
C. Wet wood ................................................................................................... 8
D. Dirty or blocked chimney............................................................................. 8
E. Chimney not long enough ........................................................................... 8
F. Poor chimney draft ...................................................................................... 8
2.3 MAINTAINING YOUR WFP-75 ............................................................................ 9
2.3.1 Creosote – Formation and need for removal .............................................. 9
2.3.2 Chimney Maintenance ............................................................................... 9
2.3.3 Fire Bafe Removal Prior to Cleaning the Chimney ..................................... 9
2.3.4 Dealing with a Chimney Fire .................................................................... 10
2.3.5 Disposal of Ashes ................................................................................... 10
2.3.6 Refractory Replacement ......................................................................... 11
2.3.7 Glass Care – Replacement .................................................................... 11
2.3.8 Glass Care – Cleaning............................................................................. 12
2.3.9 Gasket Replacement ............................................................................. 13
2.4 FIREPLACE INSTALLATION ............................................................................. 13
2.4.1 Locating the WFP-75 .............................................................................. 13
2.4.2 Heart Extension Requirements ............................................................... 14
2.4.2.1 R Value Calculations ............................................................................... 15
2.4.2.2 How to eliminate the need of a R value ................................................... 16
2.4.3 Framing, Facing, Mantel, and Combustible Shelf .................................. 17
2.4.4 Blower connection ................................................................................... 25

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 8410ii
2.5 DOOR AND FACADE INSTALLATION ............................................................... 26
2.5.1 Facade package ....................................................................................... 26
2.5.2 Install the facade ...................................................................................... 27
2.5.3 Secure the facade .................................................................................... 27
2.5.4 Adjusting the blower door ......................................................................... 27
2.5.5 Install the door ......................................................................................... 28
2.5.6 Install the door knob ............................................................................... 29
2.5.7 Adjusting the door alignment .................................................................. 29
2.6 HOT AIR DUCTING INSTALLATION ................................................................. 30
2.6.1 Gravity Convection Air Kit ....................................................................... 30
2.6.2 Forced Air Convection Kit (Not tested under EPA certication) ............... 32
2.7 Fresh Air Kit ........................................................................................................ 34
2.7.1 Fresh Air Kit Installation .......................................................................... 34
3. THE CHIMNEY .................................................................................................. 37
3.1 CHIMNEY INSTALLATION NOTES ................................................................... 37
3.2 CHIMNEY INSTALLATION INSTRUCTIONS .................................................... 38
3.3 OFFSET CHIMNEY INSTALLATION ................................................................ 41
3.4 ANGLED WALL RADIATION SHIELD .............................................................. 45
3.5 CHIMNEY SUPPORT INSTALLATION ............................................................... 45
3.6 CHIMNEY CHASE AND MULTIPLE TERMINATIONS....................................... 46
3.7 INSTALLATION INSTRUCTIONS FOR MASONRY APPLICATION................. 47
4. OPTIONS .......................................................................................................... 48
5. APPENDIX ........................................................................................................ 49
5.1. SPECIFICATIONS .............................................................................................. 49
5.2. CLEARANCES TO COMBUSTIBLE MATERIALS.............................................. 49
5.3. REPLACEMENT PARTS.................................................................................. 50
5.4. THERMAL CHARACTERISTICS OF COMMON FLOOR PROTECTION
MATERIALS* ............................................................................................................. 50
SAFETY RATING LABEL ............................................................................................ 51
HEARTHSTONE LIMITED LIFETIME WARRANTY ................................................... 52

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 84101
1. SAFETY RULES FOR OPERATING YOUR FIREPLACE
• Use only a HearthStone glass door, specically designed for the model WFP-75.
• When cleaning the replace, the ashes should be placed in a metal container with a tight
tting lid. The closed container of ashes should be placed on a non-combustible oor
or on the ground outside the house, pending nal disposal. If the ashes are disposed
of by burial in soil or otherwise locally dispersed, they should be retained in the closed
container until all cinders have thoroughly cooled.
• We recommend that our woodburning hearth products be installed and serviced by
professionals who are certied in the United States by NFI (National Fireplace Institute®)
or in Canada by WETT (Wood Energy Technology Transfer) or in Quebec by APC
(Association des Professionnels du Chauffage).
CAUTION: THE INFORMATION GIVEN ON THE CERTIFICATION LABEL AFFIXED TO
THE APPLIANCE ALWAYS OVERRIDES THE INFORMATION PUBLISHED,
IN ANY OTHER MEDIA (OWNER’S MANUAL, CATALOGUES, FLYERS,
MAGAZINES AND/OR WEB SITES).
CAUTION: NEVER USE GASOLINE, GASOLINE-TYPE LANTERN FUEL, KEROSENE,
CHARCOAL LIGHTER FLUID OR SIMILAR LIQUIDS TO START OR
‘’FRESHEN UP’’ A FIRE IN THIS FIREPLACE. KEEP ALL SUCH LIQUIDS
WELL AWAY FROM THE FIREPLACE AT ALL TIMES.
CAUTION: KEEP COMBUSTIBLE MATERIALS AT LEAST 48 INCHES AWAY FROM THE
FRONT OF THE FIREPLACE OPENING.
CAUTION: NEVER LEAVE CHILDREN UNATTENDED WHEN THERE IS A FIRE
BURNING IN THE FIREPLACE.
CAUTION: NEVER USE A GRATE OR ELEVATE THE FIRE. BUILD WOOD FIRE
DIRECTLY ON HEARTH.
CAUTION: DO NOT USE A FIREPLACE INSERT AND OTHER PRODUCTS NOT
SPECIFIED FOR USE WITH THIS FIREPLACE.
CAUTION: DO NOT OBSTRUCT AIR INLETS. THIS FIREPLACE NEEDS AIR FOR ITS
SAFE OPERATION.
WARNING: THIS FIREPLACE HAS NOT BEEN TESTED WITH AN UNVENTED OR
VENTED GAS LOG SET. TO REDUCE RISK OF FIRE OR INJURY, DO NOT
INSTALL AN UNVENTED GAS LOG SET INTO THIS FIREPLACE.
WARNING: DO NOT USE MATERIALS OTHER THAN THOSE LISTED IN THE
REPLACEMENT PARTS SECTION DURING INSTALLATION AS THEY MAY
BE SAFETY HAZARDS AND A FIRE COULD RESULT.

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 84102
CAUTION: FOR SECURITY REASONS, IT IS VERY IMPORTANT TO USE A NON-
COMBUSTIBLE MATERIAL FOR THE SURROUND OF THE FIREPLACE.
WHENEVER OVERLAPPING THE METAL FACE OF THE FIREPLACE, A
CEMENT-BOARD (DUROCK STYLE) IS MANDATORY. FAILING TO RESPECT
THIS GUIDELINE MAY RESULT IN A FIRE.
CAUTION: DO NOT INSTALL THIS FIREPLACE IN A MOBILE HOME
PLEASE NOTE THAT THE PICTURES SHOWN IN
THIS MANUAL ARE GENERIC AND MAY NOT MATCH
EXACTLY THE LOOK OF YOUR FIREPLACE.
REGISTER YOU WARRANTY ONLINE
To receive full warranty coverage, you will need to show
evidence of the date you purchased your unit. Keep your
sales invoice. We also recommend that you register your
warranty online at:
http://www.hearthstonestoves.com/customer-resources/
warranty-registration
Registering your warranty online will help us track rapidly
the information we need on your unit.

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 84103
2. THE FIREPLACE
2.1 INTRODUCTION
The WFP-75 replace is an energy efcient, heat circulating, closed combustion replace.
You will receive a lifetime of comfort and enjoyment from your replace provided it is
installed, maintained and operated properly.
• Please read these instructions and retain this manual for future reference.
• Before beginning the replace installation, consult the local authorities to obtain your
building permit and check your local building codes. Install the replace only as described
in these instructions and using only components from the manufacturers listed in table 2.
• The WFP-75 is not intended for use with a gas log. Failure to follow these instructions
will void the certication and the warranty of the replace and may result in an unsafe
installation.
• This heating unit is a supplementary heat source. An alternative heat source should
be available in the home if needed. The manufacturer cannot be responsible for
additional heating costs associated with the use of an alternative heat source. It is highly
recommended that the user buys this product from a retailer who can provide installation
and maintenance advice.
2.1.1 Parts Required
• Fireplace model WFP-75
• Insulated chimney made by the manufacturers listed in table 2, with the corresponding
specications:
- Chimney lengths
- Elbows (where necessary)
- Associated components as per these installation instructions.
2.1.2 Additional Equipment (optional)
• Gravity Convection Air Kit
• Forced Air Convection Kit
• Fire Screen

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 84104
2.2 OPERATING THE WFP-75
2.2.1 Fuel
The WFP-75 is designed to work best when fuelled with seasoned cordwood. Use solid
wood or processed solid fuel re logs only*. Hardwoods are preferred to softwoods since the
energy content of wood is relative to its density. Hardwoods will result in a longer burning re
and less frequent refuelling. A moisture content of 15% to 20% (seasoned) is recommended.
Wood that has been cut and split and let to dry under a cover for a period of one year will
usually meet those criteria. Excessively wet wood will be difcult to burn and will result
in lower efciency, increased creosoting and deposits on the glass and in the chimney.
Excessively dry wood will burn well but will also have higher emissions and shorter burning
time.
Do not burn wood scraps or garbage, treated wood or wood such as driftwood from the
ocean which has been exposed to salt or other chemicals. Salt or chemicals can corrode
the rebox and chimney. Do not burn large amounts of paper, cardboard, pine tree branches
or building construction materials. Intense ring with these materials may overheat the
replace, causing damage to the unit, a re or even possibly igniting a chimney re if the
chimney is creosoted.
CAUTION: DO NOT OVER FIRE THIS HEATER OVER FIRING CAN RESULT IN A SAFETY
HAZARD AND CAN PERMANENTLY DAMAGE THE FIREPLACE AND CHIMNEY.
2.2.2 *The use of manufactured logs
There are numerous types of manufactured logs sold on the market. You must be very
careful with this type of product. Many brands of manufactured logs contain chemical
additives. DO NOT BURN ANY MANUFACTURED LOGS CONTAINING CHEMICAL
ADDITIVES. IF YOU DO, YOU MAY OVERHEAT YOUR FIREPLACE, THEREFORE
CAUSING A FIRE HAZARD AND VOIDING YOUR WARRANTY. Logs containing chemical
additives burn a lot hotter and were designed for decorative replaces. Decorative
replaces generally have larger, cooler, and less air-tight reboxes. Your HearthStone WFP-
75, on the other hand, has a smaller, completely sealed rebox which attains much higher
temperatures. It is therefore not designed to support excessive heat caused by the addition
of chemicals in manufactured logs. Manufactured logs made of 100% wood residues do
not pose a threat to your replace. However, they must be used carefully. Manufactured
logs typically release a much larger heat output over a short period of time. Therefore,
you cannot place a large quantity of such logs into your replace. Start with one log, and
gradually increase the load. Never put more than 4 logs. The logs should be of an average
size and not exceed 8 inches in diameter.
WARNING: DO NOT POKE OR STIR THE LOGS WHILE THEY ARE BURNING.
USE ONLY FIRELOGS THAT HAVE BEEN TESTED FOR USE IN FIREPLACES (SEE
ULC/ORD-C127, COMPOSITE FIRELOGS) AND PRIOR TO USE, REFER TO FIRELOG
WARNINGS AND CAUTIONS MARKINGS ON PACKAGING.

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 84105
2.2.3 First Fires
The fresh paint on your replace needs to be cured to preserve its quality. Once the fuel load
is properly ignited, only burn small res in your replace for the rst four hours of operation.
Never open the air control more than necessary to achieve a medium burn rate. Make sure
that there is enough air circulation while curing the stove. Open one or more windows. The
odors can be smelled during the rst 3 or 4 res.
2.2.4 Building a Fire
To start a re, place several crumpled up balls of newspaper in the rebox behind the
andiron. Place small dry pieces of kindling on top of the paper, criss-crossing the kindling
so that there are air spaces in between. Keep the fuel back far enough so that air can
get underneath. Open the air controls fully and light the newspaper. Once the newspaper
and the kindling are well ignited, close the door. Once the kindling re is well established,
cordwood can be added. (See Primary Air Combustion Control section for proper operation
of the air controls). Make sure that cordwood is always behind the andiron.
The unit will burn best with 2-3 pieces of cordwood spaced 1 to 2 inches apart and allowing
air to get under the fuel. Criss-crossing or arranging the fuel so that air can get underneath,
will help the re to get started easily. The unit should be operated with the air control fully
open long enough to get the cordwood well ignited
CAUTION: PLACE THE WOOD LOGS BEHIND THE ANDIRON TO ALLOW PROPER
PRIMARY AIR FLOW
2.2.5 Maintaining the Fire
Once the wood has been consumed (or partially consumed) and you have obtained a good
bed of embers, you should reload the unit. In order to do so, open the air control to its
maximum for approximately 15 seconds prior to opening the replace door. Then, proceed
by opening the door very slowly. Open it 2” to 4” (52 to 104 mm) for 10 seconds before
opening it completely. This procedure will increase the draft and thus eliminate the smoke
which is stagnant in a state of slow combustion in the replace. Then, bring the red embers
forward, keeping them behind the andiron, and reload the unit.
Your WFP-75 replace will work best if a thick bed of hot embers is maintained in the bottom
of the rebox and a minimum of two large pieces of seasoned fuel are added. Combustion
efciency is largely related to establishing a hot ember bed and hot rebox temperatures.
The quicker the replace and chimney (ue) get up to normal operating temperatures,
the better. A small intense re is preferred to a large smouldering re, both to improve
combustion efciency and to reduce the amount of creosote build-up. The best performance
will be obtained by adding relatively small amounts of fuel to a well established ember bed,
and then operating with the air inlet control open long enough to achieve a hot re. Use
a poker to make an air channel in the embers below the wood. This will allow air to ow
under the wood for a more efcient burn. Once you have reached the desired temperature,
the primary air can be set to a medium setting. You know you have reached the desired
temperature when, closing the primary air control, you can see a ame at the top of the

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 84106
rebox. The benet of this technique will be cleaner glass, less creosoting, greater efciency
and the most pleasing re for your enjoyment.
In order to achieve an optimum efciency from your unit, we suggest that you operate it
with the air control completely closed. Make sure that you have a good re going and an
adequate ember bed before you completely close the air control. Closing the air control too
soon will lower combustion efciency and may cause the re to die out.
2.2.6 Primary Air
There is no ue damper in the WFP-75. As is common with air tight stoves, the combustion
air control sets the ow of air entering the rebox. This allows for a more precise control
of the re. The combustion air control is located below the door on the right side. The
main source of air (primary air) entering the rebox can be diminished by moving the air
combustion control from right to left. The primary air is fully opened when the air control is
completely moved to the right. The combustion air control should be in the closed position
(primary air) when the replace is not in use. This will minimize air leakage up the chimney.
The combustion air control should be opened before opening the door to minimize the
possibility of back draft coming into the room.
Figure 1

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 84107
2.2.7 Combustion Settings
Accelerated Combustion (High)
The maximum heat output for the WFP-75 is achieved by burning with the door closed and
the combustion air opened. By this method, the WFP-75 can produce up to 75,000 BTU of
heat per hour. However, it will be necessary to reload with wood every one or two hours.
This is the least efcient method of burning the WFP-75. Use caution when ring with the
combustion air control wide open. Only burn cordwood in this manner. Small dry pieces
of softwood and construction scraps will burn very intensely using this method and may
damage the rebox.
Medium Combustion
This is the recommended mode of operating the WFP-75 and should be the one normally
used since it will deposit the least amount of creosote on the glass and in the chimney. The
combustion air control must be ¾ closed. The precise setting will depend on many factors,
including chimney length and the moisture content of the wood.
To obtain the proper combustion, close the combustion air control completely, then open
it about ¼” to ½”. For shorter chimneys, open the combustion air control more, for longer
chimneys, open the combustion air control less. Three medium size pieces of wood should
be burning on a bed of hot coals. The heat output will be approximately 35,000 BTU per hour
and the loading time will be every 3-4 hours. Softwoods may be burned using this method
but the time will be substantially reduced.
Slow Combustion
When the air combustion control is completely closed, the replace is in a slow combustion
phase. If the replace is hot enough, slow combustion will not stop the re, but there will be
a noticeable change in the ame pattern. The ames will be slow and may appear dirty if the
wood is too wet (moisture content of 20% and more). Do not allow the wood to burn without
ame, since this will produce excessive creosote in the unit.
Creosote may accumulate on the glass door. This method of burning should be used only
after operating the WFP-75 with the air control opened to produce a hot re for about an
hour or at medium pace for at least 2 hours. Slow combustion can be used at night in order
to reduce the heat output and to prolong the burn. The loading time will be every 6-8 hours.
2.2.8 Smoking Causes and Troubleshooting
To reduce the likelihood of smoking when opening the door, set the combustion air controls
to the right (High) before opening the door. Occasionally, there may be a small amount of
smoking upon lighting the re, until the chimney heats up but this should not continue. If the
replace continues to smoke it is probably for one of the following reasons:
A. Negative pressure in the house
As the re burns, air goes up the chimney. This air must be replaced through leakage
into the house or by connecting to fresh, outside air. When operating the WFP-75, open a
nearby window temporarily to check if there is adequate air supply replacement. If opening a
window solves the problem, the house is under negative pressure.

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 84108
B. Fans operating (e.g.: range hood)
These fans draw air out of the house and may actually cause a negative pressure in the
house. Turn off all fans and open a nearby window to determine if this is the cause of the
problem.
C. Wet wood
Wet or tarred wood will smoulder and smoke instead of burning properly.
D. Dirty or blocked chimney
Check to make sure the chimney is clear and clean.
E. Chimney not long enough
The minimum system height is 15 feet (4.6m). The chimney must extend at least 3 feet (915
mm) above its point of contact with the roof and at least 2 feet (0.6 m) higher than any roof
or wall within 10 feet (3 m) of it. When installed with offsets, the minimum system height is
15 feet (4.6 m) to 17 feet (5.2 m) as per Table 1. Additional height will increase draft and will
decrease the tendency to smoke. If only the minimum chimney height is installed, operating
conditions must be optimal (interior chimney, minimum height of 18” before any offset, etc.).
F. Poor chimney draft
With no re, there should be sufcient draft to exhaust cigarette smoke introduced under the
bafe. Chimneys installed against an outside wall without protection may generate back draft
problems which will cause start-up problems. To prevent this, open a nearby window, roll
up a piece of paper and light it. Then, hold it in the upper part of the rebox to warm up the
chimney. Wait until the draft is sufcient, then start the re.
IMPORTANT NOTES
1. Do not block the hot air vents to the replace as this will cause the replace to
overheat.
2. Never start a re using gasoline, kerosene, charcoal lighter uid or any other
combustible liquid.
3. Do not burn coal. The sulphur in coal will corrode the rebox and damage the glass.
4. Do not burn driftwood which has been in the ocean or salt water. The salt will
corrode the rebox and chimney.
5. Do not abuse the unit by burning paper, or cardboard or construction material such
as pressed wood, plywood or lumber.
6. Do not allow the wood to smoulder or burn without ame, since this will
produce excessive creosote in the unit.

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 84109
2.3 MAINTAINING YOUR WFP-75
2.3.1 Creosote – Formation and need for removal
When wood is burned slowly without a ame, it produces tar and other organic vapors which
combine with expelled moisture to form creosote. The creosote vapors condense in the
relatively cool chimney ue of a slow-burning re. As a result, creosote residue accumulates
on the ue lining. When ignited this creosote makes an extremely hot and dangerous re.
The chimney shall be inspected at least twice a year during the heating season to determine
when a creosote build-up has occurred.
When creosote has accumulated, the chimney must be cleaned to remove the creosote and
reduce the risk of a chimney re.
2.3.2 Chimney Maintenance
Regular chimney inspection and maintenance combined with proper operation will prevent
chimney res. Keep your chimney clean. Do not allow more than 1/16” creosote build up in
your chimney. The amount of creosote will depend on variables such as frequency of use
and type of re. We recommend that you:
1. Initially inspect the chimney system weekly. From this, you will learn how often it will
be necessary to clean your chimney.
2. Have your chimney cleaned by a qualied chimney sweep. If you wish to clean it
yourself, we recommend using a stiff plastic or non-metallic brush. If a metal brush is
used, its size should be slightly smaller than the ue to avoid damaging the chimney.
Do not use a brush that will scratch the stainless steel interior of the chimney.
3. Do not expect chemical cleaners to keep your chimney clean. The rain cap can be
removed for inspection and/or cleaning of the chimney.
2.3.3 Fire Bafe Removal Prior to Cleaning the Chimney
Before starting to clean your chimney, we recommend that you remove the re bafe to
avoid creosote dust collection on top of the bafe. Follow the steps below to remove the re
bafe:
1. Remove the front air tube by pulling out the cotter pin on the side of the tube. They
are located at the top, underneath the bafe.
2. Lift the bafe assembly and slide it out of the replace. You now have access to the
chimney.

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 841010
Figure 2
2.3.4 Dealing with a Chimney Fire
Regular chimney maintenance and inspection can prevent chimney res. If you have
a chimney re, follow these steps:
1. Close the replace door and the combustion air controls;
2. Alert your family of the possible danger;
3. If you require assistance, alert your re department;
4. If possible, use a dry chemical re extinguisher, baking soda or sand to control the
re.
5. Do not use water as it may cause a dangerous steam explosion;
6. Check outside to ensure that sparks and hot embers coming out of the chimney are
not igniting the roof;
7. Do not use the replace again until your chimney and replace have been inspected
by a qualied chimney sweep or a Fire Department Inspector;
2.3.5 Disposal of Ashes
Do not attempt to clean the replace when the unit is hot. Ashes should be placed in a
metal container with a tight tting lid. The closed container of ashes should be placed on a
non- combustible oor or on the ground, well away from combustible materials pending nal
disposal. If the ashes are disposed of by burial in soil or otherwise locally dispersed they
should be retained in the closed container until all cinders have thoroughly cooled.

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 841011
2.3.6 Refractory Replacement
The intense heat of the re will normally cause hairline cracks in the refractory. These cracks
can be minimized by proper curing as described in “First Fires”. They will not normally
diminish the effectiveness of the refractory. If large cracks develop, then the refractory
should be replaced. To replace the refractory bricks, follow these steps:
1. Remove the andiron (A) held
in place by the two torx screws
(B)
2. Remove the brick retainers (C)
3. Remove the left side bricks (D)
4. Remove the right side bricks
(E)
5. Remove the rear bricks (F)
6. Remove the bottom brick (G)
To install the new bricks, follow the
above steps in reverse.
2.3.7 Glass Care – Replacement
The glass used in the WFP-75 is 5 mm thick of dimension: 13.65” x 25.30” and tested to
reach temperatures up to 1400º F. If the glass breaks, it must be replaced with one having
the same specication. Contact your HearthStone dealer to obtain a genuine replacement
part (see “replacement parts”, in appendix to get the proper part number).
WARNING: TEMPERED GLASS OR ORDINARY GLASS WILL NOT WITHSTAND THE
HIGH TEMPERATURES OF THE WFP-75.
WARNING: DO NOT ABUSE THE GLASS DOOR BY SLAMMING IT AGAINST THE
FIREPLACE.
WARNING: DO NOT OPERATE THE FIREPLACE WITH A CRACKED OR BROKEN
GLASS.
WARNING: DO NOT USE DOOR TO PUSH WOOD INTO THE STOVE.
Figure 3

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 841012
In order to replace the glass, use the following procedure:
1. Remove the glass clips (B) and pads (C), held in place by 8 screws (A).
2. Remove the glass (D).
3. Remove the glass gasket (E).
4. To install the new glass, follow the above steps in reverse order, using the adhesive
included in the glass kit to x the new glass gasket in place.
Figure 4
2.3.8 Glass Care – Cleaning
The WFP-75 is designed to keep the glass clean under normal operating conditions. If the
WFP-75 is operated continuously with the combustion air controls closed, the glass will tend
to get dirty unless the fuel, rebox and glass are maintained at higher temperatures. To clean
the glass, there are a number of specially designed cleaners. Ask a hearth professional to
recommend a suitable cleaner which is available in your area. Regular household
glass cleaners will not clean creosote and they usually contain ammonia that may stain the
glass permanently.
WARNING: ONLY WASH THE GLASS WHEN IT’S COLD.
WARNING: DO NOT USE ABRASIVES SUCH AS STEEL PADS, STEEL WOOL OR
OVEN CLEANER AS THEY WILL SCRATCH THE GLASS, MAKING IT MORE
FRAGILE.

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 841013
2.3.9 Gasket Replacement
Remove the door from the unit and lay it on a clean, non-abrasive surface. To replace the
gasket around the door frame, rst remove the old gasket and adhesive. Make sure that
the surface is totally clean before applying new adhesive or adhesion problems may result.
Apply the adhesive (supplied with the replacement gasket) in the gasket channel and install
the new gasket with a gentle pressure.
To replace the glass gasket, follow the steps in section 2.3.7. The proper replacement
gaskets are available from your HearthStone dealer in the following dimensions:
2.4 FIREPLACE INSTALLATION
2.4.1 Locating the WFP-75
A. The best location to install your replace is determined by considering the location of
windows, doors, and the trafc ow in the room where the replace is located, allowing
space in front of the unit for the heart extension and the mantel, and taking into consid-
eration the location of the hot air ducts (optional), outside air kit and chimney. If possible,
you should choose a location where the chimney will pass through the house without cut-
ting oor or roof rafters.
B. Usually, no additional oor support is needed for the replace. The adequacy of the oor
can be checked by rst estimating the weight of the replace system. Weights are given
in the appendix. Next, measure the area occupied by the replace which is normally
37.75" × 24.75" (96 cm x 63 cm). Note the oor construction and consult your local build-
ing code to determine if additional support is needed.
C. The WFP-75 may be installed directly on the oor or on a raised combustible or non
combustible base (see gure 5). That base must be at least equal (or exceed) the height
of the oor protection. For more information regarding the installation on a raised base,
refer to the “Hearth Extension Requirements” section of this manual. Please take note
that a minimum of 7 feet (2.15 m) measured from the base of the appliance to the ceiling
is required (see gure 6).
GASKET LENGHT DIMENSION
DOOR 84” ROUND 1” ROPE
GLASS 78” ROUND 1/4” ROPE

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 841014
2.4.2 Hearth Extension Requirements
The hearth extension oor area must extend at least 18" (40 cm) in front of the hearth and
at least 8" (20 cm) on each side of the door opening (see gure 7). The joint between the
hearth extension and the replace hearth needs to be made of non-combustible material
such as sheet metal (not included) as shown on gure 8.
Figure 7
Figure 5. Installation on raised base. Figure 6. Ceiling clearance requirements

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 841015
When the replace is installed directly on the oor, a noncombustible oor protection in front
of the unit must be installed and have an R value insulation equal to or greater than 1.00.
The use of an R value is convenient when more than one material is going to be used in the
hearth extension to cover the combustible surface. This is because R values are additive,
whereas K values are not. To nd the corresponding R factor to use for some selected
materials, please see Appendix section 5.4. Please note that the minimum height of the
raised base of the replace should match or exceed the height of the oor protection.
2.4.2.1 R Value Calculations
There are two ways to calculate the R factor of the oor protection. First, by adding the R-
values of the proposed materials or if some K and thickness values are given, by converting
them to R values.
To calculate the R factor for a composite oor protection made of a combination of
alternative materials, simply add the R-values of those materials. If the result is equal to
or larger than the required R value, the combination is acceptable. For R-values of some
selected materials, see Appendix section 5.4.
Example:
Required oor protection R of 1.00. Proposed materials: four inches of brick and one
inch of Durock® board
Four inches of brick (R = 4 x 0.2 = 0.8) plus 1 inch of Durock® (R = 1 x 0.52 = 0.52).
0.8 + 0.52 = 1.32.
This R value is larger than the required 1.00 and is therefore acceptable.
In the case of a known K and thickness of alternative materials to be used in combination,
convert all K values to R by dividing the thickness of each material by its K value. Add the R
values of your proposed materials as shown in the previous example.
Figure 8

Hearthstone Quality Home Heating Products, Inc ® WFP-75 Model 841016
Example:
K value = 0.75
Thickness = 1
R value = Thickness/K = 1/0.75 = 1.33
2.4.2.2 How to eliminate the need of a R value
It is possible to eliminate the R value by elevating the unit from 4'' above the oor (see
Figure 9), but the joint between the extension of the hearth and the replace must be
protected by a non-combustible material. For example, a sheet metal (not included) as
illustrated in Figure 9 (B). Please note that a combustible oor protection of at least 18” long
must be installed in front of the replace as illustrated in Figure 9 (A).
Figure 9