Century Heating CW2500 User manual

READ AND KEEP THIS MANUAL FOR REFERENCE
45793A
Printed in Canada 20-01-2016
Installation and Operation Manual
CW2500 Insert (CB00019 model)
US ENVIRONMENTAL PROTECTION
AGENCY PHASE II CERTIFIED WOOD
INSERT
Safety tested according to ULC S628
and UL 1482 Standards
by an accredited laboratory
www.century-heating.com
Stove Builder International Inc.
250, rue de Copenhague, St-Augustin-de-Desmaures
(Quebec) Canada G3A 2H3
After-sale service: 418-908-8002 E-mail: [e-mail]
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.

CW2500 Insert Installation and Operation Manual
2
THANK YOU FOR CHOOSING THIS CENTURY WOOD INSERT
As one of North America’s largest and most respected wood stove and fireplace
manufacturers, Stove Builder International takes pride in the quality and performance of all
its products. We want to help you get maximum satisfaction as you use this product.
In the pages that follow you will find general advice on wood heating, detailed instructions
for safe and effective installation, and guidance on how to get the best performance from
this insert as you build and maintain fires, and maintain your wood heating system.
We recommend that our wood burning hearth products be installed and serviced by
professionals who are certified 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).
Congratulations on making a wise purchase.
If this insert is not properly installed, combustible materials near it may overheat. To
reduce the risk of fire, follow the installation instructions in this manual exactly.
Contact local building or fire officials about restrictions and installation inspection
requirements in your area.
Please read this entire manual before you install and use your new insert. You may
need to get a building permit for the installation of this insert and the chimney that it
is connected to. Consult your municipal building department or fire department
before installation. We recommend that you also inform your home insurance
company to find out if the installation will affect your policy.
This heating unit is designed to serve as a supplementary heat source. We
recommend that a primary heat source also be available in the home. The
manufacturer cannot be responsible for costs associated with the use of another
heating system.

CW2500 Insert Installation and Operation Manual
3
Table of content
PART A - OPERATION AND MAINTENANCE ...............................6
1 Safety Information .....................................................................6
1.1 Summary of Operation and Maintenance Cautions and Warnings.........................6
2 General Information...................................................................7
2.1 CB2500 Specifications...........................................................................................7
2.2 Zone Heating and How to Make it Work for You....................................................9
2.3 The Benefits of Low Emissions and High Efficiency.............................................10
2.4 The SBI Commitment to You and the Environment.............................................. 10
2.4.1 What is Your New Insert Made Of?...................................................................10
3 Fuel ...........................................................................................11
3.1 Materials That Should Not be Burned ..................................................................11
3.2 How to Prepare or Buy Good Firewood................................................................ 11
3.2.1 What is Good Firewood?................................................................................... 11
3.2.2 Tree Species.....................................................................................................11
3.2.3 Log Length........................................................................................................12
3.2.4 Piece Size.........................................................................................................12
3.2.5 How to Dry Firewood.........................................................................................13
3.2.6 Judging Firewood Moisture Content..................................................................14
3.3 Manufactured Logs...............................................................................................14
4 Operating Your Insert..............................................................15
4.1 Your First Fires.....................................................................................................15
4.2 Lighting Fires........................................................................................................15
4.2.1 Conventional Fire Starting................................................................................. 15
4.2.2 The Top Down Fire ...........................................................................................16
4.2.3 Two Parallel Logs .............................................................................................16
4.2.4 Using Fire Starters............................................................................................16
4.3 Maintaining Wood Fires........................................................................................16
4.3.1 General Advice ................................................................................................. 16
4.3.2 Ash Removal.....................................................................................................17
4.3.3 Raking Charcoal ...............................................................................................17
4.3.4 Firing Each New Load Hot................................................................................18
4.3.5 Turning Down the Air Supply ............................................................................18
4.4 Blower Operation..................................................................................................19
4.4.1 Building Different Fires for Different Needs.......................................................19

CW2500 Insert Installation and Operation Manual
4
5 Maintaining Your Wood Heating System...............................21
5.1 Insert Maintenance...............................................................................................21
5.1.1 Plated Finish Maintenance................................................................................21
5.1.2 Cleaning Door Glass.........................................................................................21
5.1.3 Replacing the Door Gasket...............................................................................22
5.1.4 Replacing the Glass Gasket and/or the Glass ..................................................22
5.1.5 Cleaning and Painting the Insert....................................................................... 23
5.2 Chimney and Chimney Liner Maintenance...........................................................23
5.2.1 Why Chimney Cleaning is Necessary...............................................................23
5.2.2 How Often Should You Clean the Chimney?....................................................23
5.2.3 Cleaning the Chimney.......................................................................................24
PART B - INSTALLATION.............................................................25
6 Pre-Installation Masonry fireplace requirements .................25
7 Safety Information ...................................................................26
7.1 Summary of Installation Cautions and Warnings..................................................26
7.2 Regulations Covering Insert Installation...............................................................26
8 Clearances to Combustible Material......................................27
8.1 Location of the Certification Label........................................................................27
8.2 The Masonry Fireplace Throat Damper................................................................27
8.3 Compliance of a Combustible Mantel Shelf.......................................................... 27
8.4 Positioning the Unit ..............................................................................................28
8.5 Minimum Masonry Opening, Clearances to Combustibles, and Floor Protector..34
8.5.1 Reducing Wall and Ceiling Clearances Safely.................................................. 36
8.5.2 Shield construction rules...................................................................................36
8.5.3 Table of Clearance Reduction Percentages With Regards To the Type
of Shield........................................................................................................................43
9 The Venting System ................................................................44
9.1 General ................................................................................................................44
9.2 Block-Off Plate ..................................................................................................... 44
9.3 Suitable Chimneys ...............................................................................................44
9.4 Liner installation ...................................................................................................45
9.5 Chimney liner installation .....................................................................................46
9.6 Minimum Chimney Height .................................................................................... 47
9.7 The Relationship Between the Chimney and the House...................................... 47
9.7.1 Why the chimney should penetrate the highest heated space..........................47

CW2500 Insert Installation and Operation Manual
5
9.8
Supply of Combustion Air.....................................................................................48
9.8.1 Air Supply in Conventional Houses................................................................... 48
Appendix 1: Optional Faceplate and Decorative Trims
Installation................................................................................49
Appendix 2: Installation of Secondary Air Tubes and Baffle ...52
Appendix 3: Removal instructions..............................................56
Appendix 4: Exploded Diagram and Parts List..........................57
CENTURY HEATING LIMITED WARRANTY................................60
REGISTER YOUR WARRANTY ONLINE
To receive full warranty coverage, you will need to show evidence of the date you
purchased your insert. Keep your sales invoice. We also recommend that you
register your warranty online at:
http://www.century-heating.com/en/service-support/warranty-registration
Registering your warranty online will help us to quickly track the information we need
about your insert.

CW2500 Insert Installation and Operation Manual
6
PART A - OPERATION AND MAINTENANCE
Please see Part B for installation instructions.
1 Safety Information
1.1 Summary of Operation and Maintenance Cautions and Warnings
•HOT WHILE IN OPERATION, KEEP CHILDREN, CLOTHING AND FURNITURE AWAY.
CONTACT MAY CAUSE SKIN BURNS. GLOVES MAY BE NEEDED FOR INSERT
OPERATION.
•USING AN INSERT WITH CRACKED OR BROKEN COMPONENTS, SUCH AS GLASS OR
FIREBRICKS OR BAFFLES MAY PRODUCE AN UNSAFE CONDITION AND MAY DAMAGE
THE INSERT.
•OPEN THE AIR CONTROL FULLY BEFORE OPENING THE LOADING DOOR.
•THIS INSERT IS NOT DESIGNED TO BE USED WITH THE DOOR OPEN. THE DOOR MAY
BE OPEN ONLY DURING LIGHTING PROCEDURES OR RELOADING. DO NOT LEAVE
THE INSERT UNATTENDED WHEN THE DOOR IS SLIGHTLY OPENED DURING IGNITION.
ALWAYS CLOSE THE DOOR AFTER IGNITION.
•NEVER USE GASOLINE, LANTERN FUEL (NAPHTHA), FUEL OIL, MOTOR OIL,
KEROSENE, CHARCOAL LIGHTER FLUID, OR SIMILAR LIQUIDS OR AEROSOLS TO
START A FIRE IN THIS INSERT. KEEP ALL SUCH LIQUIDS OR AEROSOLS WELL AWAY
FROM THE INSERT WHILE IT IS IN USE.
•DO NOT STORE FUEL WITHIN HEATER MINIMUM INSTALLATION CLEARANCES.
•BURN ONLY SEASONED NATURAL FIREWOOD.
•DO NOT BURN:
oGARBAGE OF ANY KIND,
oCOAL OR CHARCOAL,
oTREATED, PAINTED OR COATED WOOD,
oPLYWOOD OR PARTICLE BOARD,
oFINE PAPER, COLORED PAPER OR CARDBOARD,
oSALT WATER DRIFTWOOD,
oMANUFACTURED LOGS CONTAINING WAX OR CHEMICAL ADDITIVES,
oRAILROAD TIES OR
oLIQUIDS SUCH AS KEROSCENE OR DIESEL FUEL TO START A FIRE.
•THIS APPLIANCE SHOULD BE MAINTAINED AND OPERATED AT ALL TIMES IN
ACCORDANCE WITH THESE INSTRUCTIONS.
•DO NOT ELEVATE THE FIRE BY MEANS OF GRATES, AND IRONS OR OTHER MEANS.
•SOME JURISDICTIONS IN THE USA REQUIRE A SUPPLY OF OUTDOOR COMBUSTION
AIR FOR THE INSERT. IN CANADA, AN OUTDOOR AIR SUPPLY IS NOT REQUIRED, IF A
CARBON MONOXIDE (CO) DETECTOR/ALARM IS LOCATED IN THE ROOM IN WHICH
THE INSERT IS INSTALLED. THE CO DETECTOR WILL PROVIDES WARNING IF FOR
ANY REASON THE WOOD INSERT FAILS TO FUNCTION CORRECTLY. IF YOU ARE
REQUIRED TO INSTALL AN OUTDOOR AIR SUPPLY, WE RECOMMEND THAT YOU
ALSO INSTALL A CO DETECTOR/ALARM TO PROVIDE WARNING IF SMOKE SPILLAGE
FROM THE INSERT OCCURS.

CW2500 Insert Installation and Operation Manual
7
2 General Information
2.1 CB2500 Specifications
Fuel Type Cordwood
Test Standards (safety) ULC S628 and UL 1482
Test Standard (emissions) EPA Method 28 (40 CFR Part 60)
Heating capacity range* 600 to 1700 sq. ft. (56 to 158 m
2
)
Maximum heat output** (EPA test fuel) 26,525 BTU/h (7.8 kW/h).
Maximum heat output** (natural hardwood fuel) 65,000 BTU/h (19 kW/h).
Optimum efficiency 75 %
Particulate Emissions 2.56 g/h
Test Standard (efficiency) CSA B415.1
Burn Time* 5 to 6 hours
Appliance Weight 259 lb (118 kg)
Shipping Weight 288 lb (131 kg)
Firebox Volume 1.5 cu.ft. (0.043 m
3
)
Maximum Log Length 20" east-west***
Flue Outlet Diameter 6" (150 mm) diameter (vertical)
Baffle Material Vermiculite
Mobile home approved
‡
No
* Burn time and heating capacity may vary subject to location in home, chimney draft,
chimney diameter, locality, heat loss factors, climate, fuels and other variables.
** The EPA test fuel is dimensional Douglas fir pieces stapled together into cribs with air
spaces between. We also test using the same procedure except using split hardwood
firewood to reflect real-world heat output. This insert is not intended to operate at its peak
heat output continuously.
*** East-west: through the door you see the sides of the logs; north-south: through the door
you see the ends of the logs.
‡
Mobile home (Canada) or manufactured home (USA):
The US department of Housing and Urban Development describes “manufactured
homes” better known as “mobile home” as followed; Buildings built on fixed wheels
and those transported on temporary wheels/axles and set on a permanent foundation.

CW2500 Insert Installation and Operation Manual
8

CW2500 Insert Installation and Operation Manual
9
2.2 Zone Heating and How to Make it Work for You
Your new CB2500 wood insert is a space heater, which means it is intended to heat the
area it is installed in, as well as spaces that connect to that area, although to a lower
temperature. This is called zone heating and it is an increasingly popular way to heat
homes or spaces within homes.
Zone heating can be used to supplement another heating system by heating a particular
space within a home, such as a basement family room or an addition that lacks another
heat source.
Although the insert may be able to heat the main living areas of your house to an adequate
temperature, we strongly recommend that you also have a conventional oil, gas or electric
heating system to provide backup heating.
Your success with zone heating will depend on several factors, including the correct sizing
and location of the insert, the size, layout and age of your home and your climate zone.
Three-season vacation homes can usually be heated with smaller inserts than houses that
are heated all winter.

CW2500 Insert Installation and Operation Manual
10
2.3 The Benefits of Low Emissions and High Efficiency
The low smoke emissions produced by the special features inside the CB2500 firebox
mean that your household will release up to 90 percent less smoke into the outside
environment than if you used an older conventional stove. But there is more to the
emission control technologies than protecting the environment.
The smoke released from wood when it is heated contains about half of the energy content
of the fuel. By burning the wood completely, your insert releases all the heat energy from
the wood instead of wasting it as smoke up the chimney. Also, the features inside the
firebox allow you to reduce the air supply to control heat output, while maintaining clean
and efficient flaming combustion, which boosts the efficient delivery of heat to your home.
The emission control and advanced combustion features of your insert can only work
properly if your fuel is in the correct moisture content range of 15 to 20 percent. See
Section A3.0 of this manual for suggestions on preparing fuelwood and judging its
moisture.
2.4 The SBI Commitment to You and the Environment
The SBI team is committed to protecting the environment, so we do everything we can to
use only materials in our products that will have no lasting negative impact on the
environment.
2.4.1 What is Your New Insert Made Of?
The body of your insert, which is most of its weight, is carbon steel. Should it ever become
necessary many years in the future, almost the entire insert can be recycled into new
products, thus eliminating the need to mine new materials.
The paint coating on your insert is very thin. Its VOC content (Volatile Organic
Compounds) is very low. VOCs can be responsible for smog, so all the paint used during
the manufacturing process meets the latest air quality requirements regarding VOC
reduction or elimination.
The air tubes are stainless steel, which can also be recycled.
Vermiculite is used for the baffle. Vermiculite is a mineral. Large commercial mines exist in
China, Russia, South Africa, and Brazil. Potassium silicate is used as binder to form a
rigid board. Vermiculite can withstand temperatures above 2,000 °F. It is not considered
hazardous waste. Disposal at a landfill is recommended.
Lightweight firebrick is made of pumice and cement. Pumice is volcanic rock, a naturally
green product found in the Northwest United States. Disposal at a landfill is recommended.
The door and glass gaskets are fibreglass which is spun from melted sand. Black gaskets
have been dipped into a solvent-free solution. Disposal at a landfill is recommended.
The door glass is a 5 mm thick ceramic material that contains no toxic chemicals. It is
made of natural raw materials such as sand and quartz that are combined in such a way to
form a high temperature glass. Ceramic glass cannot be recycled in the same way as
normal glass, so it should not be disposed of with your regular household products.
Disposal at a landfill is recommended.

CW2500 Insert Installation and Operation Manual
11
3 Fuel
3.1 Materials That Should Not be Burned
• GARBAGE OF ANY KIND,
• COAL OR CHARCOAL,
• TREATED, PAINTED OR COATED WOOD,
• PLYWOOD OR PARTICLE BOARD,
• FINE PAPER, COLORED PAPER OR CARDBOARD,
• SALT WATER DRIFTWOOD,
• MANUFACTURED LOGS CONTAINING WAX OR CHEMICAL ADDITIVES,
• RAILROAD TIES,
• LIQUIDS SUCH AS KEROSCENE OR DIESEL FUEL TO START A FIRE.
3.2 How to Prepare or Buy Good Firewood
3.2.1 What is Good Firewood?
Good firewood has been cut to the correct length for the insert, split to a range of sizes and
stacked in the open until its moisture content is reduced to 15 to 20 per cent.
3.2.2 Tree Species
The tree species the firewood is produced from is less important than its moisture content.
The main difference in firewood from various tree species is the density of the wood.
Hardwoods are denser than softwoods. People who live in the coldest regions of North
America usually have only spruce, birch and poplar, other low-density species to burn and
yet they can heat their homes successfully.
Homeowners with access to both hardwood and softwood fuel sometimes use both types
for different purposes. For example, softer woods make good fuel for relatively mild
weather in spring and fall because they light quickly and produce less heat Softwoods are
not as dense as hardwoods so a given volume of wood contains less energy. Using
softwoods avoids overheating the house, which can be a common problem with wood
heating in moderate weather. Harder woods are best for colder winter weather when more
heat and longer burn cycles are desirable.
Note that hardwood trees like oak, maple, ash and beech are slower growing and longer
lived than softer woods like poplar and birch. That makes hardwood trees more valuable.
The advice that only hardwoods are good to burn is outdated. Old, leaky cast iron stoves
wouldn’t hold a fire overnight unless they were fed large pieces of hardwood. That is no
longer true. You can successfully heat your home by using the less desirable tree species
and give the forest a break at the same time.

CW2500 Insert Installation and Operation Manual
12
3.2.3 Log Length
Logs should be cut at least 1” (25 mm) shorter than the firebox so they fit in easily. Pieces
that are even slightly too long make loading the insert very difficult. The most common
standard length of firewood is 16” (400 mm).
The pieces should be a consistent length, with a maximum of 1” (25 mm) variation from
piece to piece.
3.2.4 Piece Size
Firewood dries more quickly when it is split. Large unsplit rounds can take years to dry
enough to burn. Even when dried, unsplit logs are difficult to ignite because they don’t
have the sharp edges where the flames first catch. Logs as small as 3” (75 mm) should be
split to encourage drying.
Wood should be split to a range of sizes, from about 3” to 6” (75 mm to 150 mm) in cross
section. Having a range of sizes makes starting and rekindling fires much easier. Often,
the firewood purchased from commercial suppliers is not split finely enough for convenient
stoking. It is sometimes advisable to resplit the wood before stacking to dry.

CW2500 Insert Installation and Operation Manual
13
3.2.5 How to Dry Firewood
Firewood that is not dry enough to burn is the cause of most complaints about wood
inserts. Continually burning green or unseasoned wood produces more creosote and
involves lack of heat and dirty glass door. See Section 5: Maintaining your wood
heating system for concerns about creosote.
Here are some things to consider in estimating drying time:
• firewood takes a long time to dry
• firewood bought from a dealer is rarely dry enough to burn, so it is advisable to buy the
wood in spring and dry it yourself
• drying happens faster in dry weather than in damp, maritime climates
• drying happens faster in warm summer weather than in winter weather
• small pieces dry more quickly than large pieces
• split pieces dry more quickly than unsplit rounds
• softwoods take less time to dry than hardwoods
• softwoods like pine, spruce, and poplar/aspen can be dry enough to burn after being
stacked in the open for only the summer months
• hardwoods like oak, maple and ash can take one, or even two years to dry fully,
especially if the pieces are big
• firewood dries more quickly when stacked in the open where it is exposed to sun and
wind; it takes much longer to dry when stacked in a wood shed
• firewood that is ready to burn has a moisture content between 15 and 20% by weight
and will allow your insert to produce its highest possible efficiency

CW2500 Insert Installation and Operation Manual
14
3.2.6 Judging Firewood Moisture Content
You can find out if some firewood is dry enough to burn by using these guidelines:
• cracks form at the ends of logs as they dry
• as it dries in the sun, the wood turns from white or cream colored to grey or yellow,
• bang two pieces of wood together; seasoned wood sounds hollow and wet wood
sounds dull,
• dry wood is much lighter in weight than wet wood,
• split a piece, and if the fresh face feels warm and dry it is dry enough to burn; if it feels
damp, it is too wet,
• burn a piece; wet wood hisses and sizzles in the fire and dry wood does not.
You could buy a wood moisture meter to test your
firewood.
3.3 Manufactured Logs
Do not burn manufactured logs made of wax impregnated sawdust or logs with any
chemical additives. Manufactured logs made of 100% compressed sawdust can be
burned, but be careful burning too much of these logs at the same time. Start with one
manufactured log and see how the insert reacts. Never use more than two manufactured
logs.

CW2500 Insert Installation and Operation Manual
15
4 Operating Your Insert
4.1 Your First Fires
Two things will happen as you burn your first few fires; the paint cures and the internal
components of the insert are conditioned.
As the paint cures, some of the chemicals vaporize. The vapors are not poisonous, but
they do smell bad. Fresh paint fumes can also cause false alarms in smoke detectors. So,
when you first light your insert, be prepared by opening doors and/or windows to ventilate
the house. As you burn hotter and hotter fires, more of the painted surfaces reach the
curing temperature of the paint. The smell of curing paint does not disappear until you
have burned one or two very hot fires.
Burn one or two small fires to begin the curing and conditioning process. Then build bigger
and hotter fires until there is no longer any paint smell from the insert. Once the paint smell
disappears, your insert is ready for serious heating.
4.2 Lighting Fires
Each person who heats with wood develops their own favorite way to light fires. Whatever
method you choose, your goal should be to get a hot fire burning quickly. A fire that starts
fast produces less smoke and deposits less creosote in the chimney. Here are three
popular and effective ways to start wood fires.
4.2.1 Conventional Fire Starting
The conventional way to build a wood
fire is to bunch up 5 to 10 sheets of
plain newspaper and place them in the
firebox. Next, place 10 or so pieces of
fine kindling on the newspaper. This
kindling should be very thin; less than
1” (25 mm). Next, place some larger
kindling pieces on the fine kindling.
Open the air control fully and light the
newspaper. If you have a tall, straight
venting system you should be able to
close the door immediately and the fire
will ignite. Once the fire has ignited,
close the door and leave the air control
fully open.
A conventional kindling fire with paper
under finely split wood.
DO NOT LEAVE THE INSERT UNATTENDED WHEN THE DOOR IS SLIGHTLY
OPENED. ALWAYS CLOSE AND LATCH THE DOOR AFTER THE FIRE IGNITES.
After the kindling fire has mostly burned, you can add standard firewood pieces until you
have a fire of the right size for the conditions.

CW2500 Insert Installation and Operation Manual
16
4.2.2 The Top Down Fire
The top down fire starting method solves two problems with the conventional method: first,
it does not collapse and smother itself as it burns; and second, it is not necessary to build
up the fire gradually because the firebox is loaded before the fire is lit. A top down fire can
provide up to two hours of heating or more. The top down method only works properly if
the wood is well-seasoned.
Start by placing three or four full-sized split pieces of dry firewood in the firebox. Next,
place 4 or 5 more finely split pieces of firewood (2” to 3” [50 mm to 75 mm] in dia.) on the
base logs at right angles (log cabin style). Now place about 10 pieces of finely split kindling
on the second layer at right angles.
The fire is topped with about 5 sheets of newspaper. You can just bunch them up and stuff
them in between the kindling and the underside of the baffle. Or you can make newspaper
knots by rolling up single sheets corner to corner and tying a knot in them. The advantage
of knots is that they don’t roll off the fire as they burn. Light the newspaper and watch as
the fire burns from top to bottom.
4.2.3 Two Parallel Logs
Place two spit logs in the firebox. Place a few sheets of twisted newspaper between the
logs. Now place some fine kindling across the two logs and some larger kindling across
those, log cabin style. Light the newspaper.
4.2.4 Using Fire Starters
Many people like to use commercial fire starters instead of newspaper. Some of these
starters are made of sawdust and wax and others are specialized flammable solid
chemicals. Follow the package directions for use.
Gel starter may be used but only if there are no hot embers present. Use only in a cold
firebox to start a fire.
DO NOT USE FLAMMABLE LIQUIDS SUCH AS GASOLINE, NAPHTHA, FUEL OIL,
MOTOR OIL, OR AEROSOLS TO START OR REKINDLE THE FIRE.
4.3 Maintaining Wood Fires
4.3.1 General Advice
Wood heating with a space heater is very different than other forms of heating. There will
be variations in the temperature in different parts of the house and there will be variations
in temperature throughout the day and night. This is normal, and for experienced wood
burners these are advantages of zone heating with wood.
Do not expect steady heat output from your insert. It is normal for its surface temperature
to rise after a new load of wood is ignited and for its temperature to gradually decline as
the fire progresses. This rising and falling of temperature can be matched to your
household routines. For example, the area temperature can be cooler when you are active,
such as when doing housework or cooking, and it can be warmer when you are inactive,
such as when reading or watching television.

CW2500 Insert Installation and Operation Manual
17
Wood burns best in cycles. A cycle starts when a new load of wood is ignited by hot coals
and ends when that load has been consumed down to a bed of charcoal about the same
size as it was when the wood was loaded. Do not attempt to produce a steady heat output
by placing a single log on the fire at regular intervals. Always place at least three, and
preferably more, pieces on the fire at a time so that the heat radiated from one piece helps
to ignite the pieces next to it. Each load of wood should provide several hours of heating.
The size of each load can be matched to the amount of heat needed.
When you burn in cycles, you rarely need to open the insert’s loading door while the wood
is flaming. This is an advantage because there is more chance that smoke will leak from
the insert when the door is opened as a full fire is burning.
IF YOU MUST OPEN THE DOOR WHILE THE FUEL IS FLAMING, OPEN THE AIR CONTROL FULLY
FOR A FEW MINUTES, THEN UNLATCH AND OPEN THE DOOR SLOWLY.
4.3.2 Ash Removal
Ash should be removed from the firebox every two or three days of full time heating. Do
not let the ash build up in the firebox because it will interfere with proper fire management.
The best time to remove ash is after an overnight fire when the insert is relatively cool, but
there is still some chimney draft to draw the ash dust into the insert and prevent it from
coming into the room.
After ashes have been removed from the insert and placed in a tightly covered metal
container, they should be taken outside immediately. The closed container of ashes should
be placed on a non-combustible floor or on the ground well away from all combustible
materials pending final disposal. Ashes normally contain some live charcoal that can stay
hot for several days. 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. Other waste should not be placed in this container.
NEVER STORE ASHES INDOORS OR IN A NON-METALIC CONTAINER OR ON A WOODEN DECK.
4.3.3 Raking Charcoal
Rekindle the fire when you notice that the room temperature has fallen. You will find most
of the remaining charcoal at the back of the firebox, furthest from the door. Rake these
coals towards the door before loading. There are two reasons for this raking of the coals.
First, it concentrates them near where most of the combustion air enters the firebox and
where they can ignite the new load quickly, and second, the charcoal will not be smothered
by the new load of wood. If you were to simply spread the charcoal out, the new load will
smoulder for a long time before igniting.
Remove ash first, and then rake charcoal towards the front of the firebox before loading so
that it will ignite the new load.

CW2500 Insert Installation and Operation Manual
18
4.3.4 Firing Each New Load Hot
Place the new load of wood on and behind the charcoal, and not too close to the glass.
Close the door and open the air control fully. Leave the air control fully open until the
firebox is full of flames, the wood has charred to black and its edges are glowing red. Firing
each load of wood hot accomplishes a few things:
• drives the surface moisture from the wood,
• creates a layer of char on the wood, which slows down its release of smoke,
• heats the firebox components so they reflect heat back to the fire, and
• heats the chimney so it can produce strong, steady draft for the rest of the cycle.
Although it is important to fire each new load hot to prepare for a clean burn, do not allow
the fire to burn at full intensity for more than a few minutes.
DO NOT LEAVE THE INSERT UNATTENDED WHILE A NEW LOAD IS BEING FIRED
HOT.
DO NOT OVERFIRE.
When you burn a new load of wood hot to heat up the wood, the insert and the chimney,
the result will be a surge of heat from the insert. This heat surge is welcome when the
room temperature is a little lower than desirable, but not welcome if the space is already
warm. Therefore, allow each load of wood to burn down so that the space begins to cool
off a little before loading. Letting the space cool before loading is one of the secrets to
clean burning and effective zone heating.
4.3.5 Turning Down the Air Supply
Once the firewood, firebox and chimney are hot, you can begin to reduce the air supply for
a steady burn.
As you reduce the air supply to the fire, two important things happen. First, the firing rate
slows down to spread the heat energy in the fuel over a longer period of time. Second, the
flow rate of exhaust through the insert and flue pipe slows down, which gives more time for
the transfer of heat from the exhaust. You will notice that as you reduce the air setting, the
flames slow down. This is your indication that the insert is burning at its peak efficiency.
If the flames get small and almost
disappear when you turn down the
air, you have turned down the air
too early, or your firewood is wetter
than it should be. With good fuel
and correct air control use, the
flames should slow down, but
should stay large and steady, even
as the air supply is reduced.

CW2500 Insert Installation and Operation Manual
19
4.4 Blower Operation
Allow the insert to reach operating temperature (approximately one hour), before turning
on the blower, since increased airflow from the blower will remove heat and affect the
start-up combustion efficiency.
NOTE: ENSURE THE BLOWER CORD IS NOT IN CONTACT WITH ANY SURFACE OF
THE INSERT TO PREVENT ELECTRICAL SHOCK OR FIRE DAMAGE. DO NOT RUN
CORD BENEATH THE INSERT.
Turn the blower ON or OFF with the rheostat located on the
left side of the blower
assembly below the bottom louvre.
The switch settings are Off, High (HI) and adjustable down
to Low (LO).
4.4.1 Building Different Fires for Different Needs
Using the air control is not the only way to match the insert’s heat output to the heat
demand. Your house will need far less heat in October than in January to be kept at a
comfortable temperature. If you fill the firebox full in fall weather, you will either overheat
the space or turn the insert down so much that the fire will be smoky and inefficient. Here
are some suggestions for building fires to match different heat demand.
4.4.1.1 Small Fires to Take the Chill Off the House
To build a small fire that will produce a low heat output, use small pieces of firewood and
load them crisscross in the firebox. The pieces should be only 3” to 4” in diameter. After
raking the coals, you can lay two pieces parallel to each other corner to corner in the
firebox and lay two more across them in the other direction. Open the air control fully and
only reduce the air after the wood is fully flaming. This kind of fire is good for mild weather
when you are around to tend the insert and should provide enough heat for four hours or
more. Small fires like this are a good time to use softer wood species so there will be less
chance of overheating the house.
4.4.1.2 Long Lasting Low Output Fires
Sometimes you will want to build a fire to last up to eight hours, but don’t need intense
heat. In this case use soft wood species and place the logs compactly in the firebox so the
pieces are packed tightly together. You will need to fire the load hot for long enough to fully
char the log surfaces before you can turn the air down. Make sure the fire is flaming
brightly before leaving the fire to burn.
4.4.1.3 High Output Fires for Cold Weather
When the heat demand is high during cold weather, you’ll need a fire that burns steadily
and brightly. This is the time to use larger pieces of hardwood fuel if you have it. Put the
biggest pieces at the back of the firebox and place the rest of the pieces compactly. A
densely built fire like this will produce the longest burn your insert is capable of.

CW2500 Insert Installation and Operation Manual
20
You will need to be cautious when building fires like this because if the air is turned down
too much, the fire could smoulder. Make sure the wood is flaming brightly before leaving
the fire to burn.
4.4.1.4 Maximum Burn Cycle Times
The burn cycle time is the period between loading wood on a coal bed and the
consumption of that wood back to a coal bed of the same size. The flaming phase of the
fire lasts for roughly the first half of the burn cycle and the second half is the coal bed
phase during which there is little or no flame. The length of burn you can expect from your
insert, including both the flaming and coal bed phases, will be affected by a number of
things, such as:
• firebox size,
• the amount of wood loaded,
• the species of wood you burn,
• the wood moisture content,
• the size of the space to be heated,
• the climate zone you live in, and
• the time of year.
The table below provides a very general indication of the maximum burn cycle times you
are likely to experience, based on firebox volume.
FIREBOX VOLUME
MAXIMUM
BURN TIME
<1.5 cubic feet 3 to 5 hours
1.5 c.f. to 2.0 c.f 5 to 6 hours
2.0 c.f. to 2.5 c.f. 6 to 8 hours
2.5 c.f. to 3.0 c.f. 8 to 9 hours
>3.0 c.f. 9 to 10 hours
Long burn times are not necessarily an indication of efficient insert operation. When you
are home during the day and able to tend the fire, it is preferable to build a smaller fire that
might provide three or four hours of heating than to fully load the firebox for a much longer
burn. Shorter burn cycles make it easier to match the heat output of the insert to the heat
demand of the space.
4.4.1.5 North-South Fires Versus East-West Fires
In fireboxes that are roughly square, wood can be loaded so that looking through the glass
door you see the ends of the logs (north-south) or the sides of the logs (east-west).
East-west loads that are built compactly break down slowly when heated, but the amount
of wood you can load is limited because if you put in too many pieces, one may fall against
the glass. East-west loads are excellent for long, low output fires for relatively mild
weather.
North-south loads break down more quickly, but much more wood can be loaded at a time.
This makes north-south loading good for high output, long lasting fires for cold weather.