HOMEOWNER'S CARE AND
OPERATION INSTRUCTIONS
COLONIAL SERIES
36" Wood Burning Fireplaces
P/N 875,005M REV. D 04/2006
MODELS
COL-3629
COL-3629H
The information contained in this manual applies to all model fireplaces
identified on this page. This information will help you obtain safe and
dependable service from your Lennox fireplace system. Keep this docu-
ment in a safe place for future reference.
Before you start your first fire, read this Care and Operations Manual
carefully to be sure you understand your fireplace system completely.
Failure to follow these suggestions could result in hazardous operation or
fireplace malfunction, creating a serious potential for personal injury and/
or property damage.
If you have any questions regarding the safe use or operation of your
fireplace, contact your local Lennox Dealer or your contractor/builder.
WH Report No. J20054576-231
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
1. The type of wood used.
2. How dry it is.
3. How many logs you put in.
4. The size of the logs.
6. Most wood needs to be seasoned 9 to 12
months to reduce the moisture content and
produce good steady fires. When moisture
content is reduced from 60 to 20%, the gain in
heat potential is nearly 7%.
Gas Logs
Ifyourfireplacesystemwasinstalledwithagas
line, you may wish to install one of two types of
gas log sets.
The last statement means that one big log
weighing 10 pounds has as much heating po-
tential as 10 pounds of twigs. However, air
cannot get at the solid log to feed the fire so the
solid log will burn slowly. While you would get
the same amount of heat out of either fire, the
smaller the pieces of wood and the more air
space around them, the faster the fire will burn.
7. Proper storage of wood, especially during
seasoning, is essential. We recommend that
you:
This fireplace has been tested and approved for
usewithadecorativegasapplianceincorporat-
inganautomaticshut-offdeviceandcomplying
with the Standard for Decorative Gas Appli-
ances for installation in vented fireplaces, ANSI
Z21.60(1991). Decorativegasappliancesmay
be installed in these fireplaces. Installation
must be in accordance with the national Fuel
GasCode,ANSIZ223.1forcompliancewiththe
revised U.L. 127 Standard.
a. Never store wood on the ground. This will
causerottingandinsectinfiltration.Raisewood
on flat rock or scrap wood.
b. Stack wood loosely to allow air circulation.
DISPOSAL OF ASHES
c. Store wood where it will not be excessively
exposed to weather, such as under a tarp or
under a roof.
Ashes should be placed in a metal container
with a tight fitting lid. The closed container of
ashes should be placed on a noncombustible
floor or on the ground, well away from all
combustible materials, pending final disposal.
Iftheashesaretobedisposedofbyburialinsoil
or other wise locally dispersed, they should be
retained in the closed container until all cinders
have thoroughly cooled.
CAUTION: WHEN USING A DECORATIVE
GAS APPLIANCE, THE FIREPLACE
DAMPER MUST BE SET TO THE FULLY
OPEN POSITION.
d. Do not stack wood directly against the walls
of your home.
These fireplaces have been tested and ap-
provedtoANSI/IAS/AGAZ21.11.2forusewith
an unvented gas appliance having a maximum
rating of 40,000 BTU and complies with the
StandardforFactory-BuiltFireplaces,U.L.127,
when installed with unvented gas log sets.
8. Be a knowledgeable wood buyer. There is a
difference in cord sizes. A standard cord stack
of logs is 4 ft. high by 8 ft. long by 4 ft. deep or
the equivalent of this cubic footage, (Figure 1 ).
SOFTWOOD VS HARDWOOD
Standard
Cord of
Softwoods contain about 15 percent highly
flammableresinwhichgeneratescreosotesoot
in the chimney flue. Burning softwood exclu-
sively may not be as desirable nor as safe as
burning denser hardwoods. Many experienced
fire-builders use small amounts of softwood
kindling and newspaper in conjunction with
startingafirewithsplithardwoodlogs.Hereare
some guidelines to remember:
Wood
8'
Prior to installing any gas log set, (Vented or
Unvented) refer to the fireplace installation
instructions for verification of mantle heights
andplacementofcombustiblematerialsaround
the firebox opening. NEVER INSTALL AN
UNVENTED GAS LOG SET WITH A BTU RAT-
ING GREATER THAN 40,000 BTU. Vented gas
log sets do not have restrictions placed upon
their BTU rating.
4'
4'
1.Softwoodsproducefastwarmingandshorter
fires. Hardwoods burn less vigorously, have
shorter flames and produce steady, glowing
coals.
Wood Fuel Pointers
Figure 1
Wood is a wonderful renewable fuel source.
Normally it burns clean, leaving only a mini-
mum of waste ash, provides comforting heat
and can provide a variety of aromas and visual
images.
A face cord is the same height and length as a
standard cord but the depth is only the length
of the logs (12, 18 or 24 inches). A face cord
can contain as little as 25% of the wood found
in a standard cord.
2. As a general rule, denser woods contain
morepotentialheatperpound.Mostsoftwoods
offer moderate heat value per pound.
3.Differentwoodsvarywidelyinflameheights,
flame intensities, smoke characteristics and in
sparking. Most hardwoods do not spark.
Youwillwanttoknowwhichwoodsarebestfor
use. Sometimes you may want a quick, short
fire to offset a morning chill. Soft woods are
preferable in this case. Other times you would
want more slow burning and a uniform heat
output. Hardwoods are preferable for this use.
If you buy by the ton, remember that wood
becomes lighter as it dries. When buying green
or wet wood, ask for some extra poundage to
allow for the extra water you will be getting.
4. Most freshly cut “green” wood will not burn
well and will smoke. Green wood can be from
10 to 40 percent less efficient than air-dried
seasoned wood.
9. When comparing woods of the same mois-
ture content and same species, we find most
woods have approximately the same heating
potential per pound.
The amount of heat available from the logs will
be about equal on a weight basis. However,
logs are generally not weighed so the amount
of heat will depend on:
5. Moisture and resin found inside unseasoned
wood cells will build up pressure under heat
and explode as sparks.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
3
However, most wood is sold by volume, not by
weight. To determine the best heating source,
look at the density of various wood types.
(Density is the weight for a given size.) The
higher the density, the more potential heat
output. A standard cord has a volume of 128
cubic feet. This figure also includes the air
space between and around the wood. The ac-
tual volume in a standard cord is between 60
and 100 cubic feet; depending on how tightly
the wood is packed.
4. Build a pyramid of three split logs (split will
start much faster). Arrange the uneven wood to
provide plenty of air space between.
STARTING A FIRE
1. To start a fire in a the fireplace properly, first
check the operation of the flue damper.
5. Now, light the paper at both sides of the
firebox.
2. To prevent smoking at start-up, close any
window located near the fireplace when first
lighting a fire. The closed windows may be
reopened once a chimney draft is drawn in the
fireplace.
6. Close the screens to prevent the escape of
sparks and embers.
7. Close the damper only when your fire is
completely out and ashes are cold. Keep closed
whenfireplaceisnotinusetopreventunneces-
sary loss of heated or cooled air.
DAMPER CONTROL
Assumingthatyouarecomparingtwostandard
cords of different species but the same volume
and moisture content, the denser species will
providemoreBTU’s.Thetableofwoodspecies/
densities reveals more helpful guidelines.
This fireplace is fitted with a manually con-
trolledchimneydamper. Thechimneydamper
should be closed when the fireplace is not in
use to prevent cold air from entering the home
through the chimney system.
GLASS DOOR OPERATING SAFETY
PRECAUTIONS AND INSTRUCTIONS
These fireplaces may be equipped with glass
doors. Refer to the end of this document for a
listing of the glass doors approved for use with
these fireplaces.
HARDWOODS
DENSITY
The damper is controlled through the use of a
control lever located within the firebox open-
ing at the top center just behind the firebox
lintel (Figure 2 ).
Alser, Red
Ash
Aspen
Basswood, American
Beech, American
Birch
.41
.49-.60
.38-.39
.37
.64
.55-.65
.38
.50
.43
.34-.40
.60.63
.53
.60.66
.69-.75
.66 (est.)
.69
.48-.50
.48-.63
.59-.67
.64-.88
.42
WARNING: IF YOUR FIREPLACE IS
EQUIPPED WITH GLASS DOORS, IT
SHOULDBEOPERATEDWITHTHEDOORS
FULLY OPEN OR FULLY CLOSED. IF THE
DOORSARELEFTPARTIALLYOPEN,GAS
AND FLAMES MAY BE DRAWN OUT OF
THEOPENING,CREATINGRISKSOFBOTH
FIRE AND SMOKE. REFER TO FIGURE 3
FOR PROPER OPERATING CONDITIONS.
Push back and up (away from the front of the
fireplace) to lock the damper blade in the
OPEN position. To lock the damper in the
CLOSED position, the damper handle needs
to be pulled forward and up (towards the
front of the fireplace).
Butternut
Cherry, Black
Chestnut, American
Cottonwood
Elm
Hackberry
Hickory, Pecan
Hickory, True
Honey locust
Locust, Black
Magnolia
Maple
Oak, Red
Oak, White
Poplar
Sassafras
Damper
Open
Damper
Closed
Lintel
Combustion
Air Actuator
.42
Sweet gum
Sycamore, American
Tanoak
.52
.49
.64 (est.)
.50
Tupelo
Fully Open or
Fully Closed
Figure 2
Walnut, Black
.55
Willow, Black
.39
(Bi-Fold Doors)
The appliance flue damper must always re-
main open when operating.
SOFTWOODS
DENSITY
Figure 3
3. The grate in the firebox should be centered
on or over the bottom hearth so your fire can
breath properly. Crumble and twist plenty of
newspapers UNDER the grate and criss-cross
some small dry kindling sticks on top of the
paper or on the bottom of the grate.
Bald cypress
Cedar
Douglas Fir
Fir
Hemlock
Larch, Western
Pine
Redwood
Spruce
Tamarack
.46
.31-.47
.46-.50
.32-.43
.40-.45
.52
.39-.59
.35-.40
.35-.41
.53
CAUTION: IF A SMOKING CONDITION EX-
ISTS, GLASSDOORSSHOULDBECLOSED
DURING FIREPLACE OPERATION.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
4
IMPORTANT: Plated polished brass glass
doors may have a plastic covering over all
brass pieces for protection during shipping
and handling. The plastic covering should be
removedbeforeinstallationoftheglassdoors.
Under the plastic covering is a protective
lacquercoatingwhichshouldnotberemoved.
In some instances, if it is removed, irrevers-
ible damage to the brass finish could occur.
Refer to the following for specific information
on plated polished brass.
Care and Cleaning of Your Glass Doors
Combustion Air Control
Never clean the glass when the doors are hot.
Do not use ammonia or ammonia based glass
or household cleaner to clean the glass or the
door frame. An ammonia based cleaner will
damage the finish of the glass door.
Theactuatorforcombustionairsystemisstan-
dard on all fireplaces but must not be operated
if the complete system is not installed. See
Figure 4 and refer to Figure 2.
The control lever is located on the left side of
the fireplace opening behind the screen panel.
If your fireplace is equipped with the optional
combustion air kit, the control lover will move
freely. If not, the retention plate will not have
been removed. To open the air damper, turn
upwards. To close, turn down.
Clean the glass doors by wiping with a damp
towel followed by a clean dry towel to remove
streaks.
Remove stubborn stains from the glass with a
mild soap solution and a towel dampened with
clean water. Dry with a clean dry towel.
IMPORTANT: The lacquer coating on the pol-
ished brass glass doors and trim pieces can
be damaged or removed causing corrosion
and/or tarnish. Do not remove the protective
lacquer coating from plated polished doors
and trim. To help protect the finish; use a
non-acidic wax and avoid the over-spray of
acidic/alkali based glass cleaners on the
brass pieces. Please understand that the
heat of the fire will cause the protective lac-
querfinishtoslightlychangetoalightcaramel
color. Do not be alarmed as this is a normal
occurrence.
• The fire must always be confined within the
boundaries of the fuel grate.
OPEN
• The fireplace screens must always be closed
whenever the fireplace is being used.
• Never slam the glass door since it could cause
the glass to break.
CLOSED
Figure 4
• Do not build excessively large or hot fires —
scorching or discoloring of the plated brass
trim may occur.
COMBUSTION AIR
Aproperamountofcombustionairisimportant
for your fireplace. Fireplaces consume large
amounts of oxygen.
•Extremetemperaturechangescancauseglass
breakage—donotbuildahotfireandclosethe
glass doors if the doors are cold.
WARNING: DO NOT OPERATE THE COM-
BUSTION AIR ACTUATOR UNLESS A
COMPLETE OUTSIDE COMBUSTION AIR
VENT SYSTEM HAS BEEN INSTALLED
WITH YOUR FIREPLACE.
It is important to allow an adequate supply of
air. If the fireplace is not equipped with an
outside air kit, it may not obtain sufficient
amounts of combustion air from inside the
house or structure in which it is installed.
Therefore, thefiremaydrawfromanoutsideair
sourceandpullairinthroughthechimney. This
may cause smoke spillage into the room.
•Ifthetemperedglasspanebecomesscratched
or chipped, it creates a weakness in the glass
whichcancausetheglasstobreakwhenheated.
Replace the pane of glass by contacting your
nearest dealer.
REFRACTORIES
CAUTION: GLASS AND METAL FRAMES
GET HOT — ALWAYS USE HANDLES TO
OPEN AND CLOSE THE DOORS.
All fireboxes contain a furnace refractory floor,
sides and back. These refractories are rein-
forcedwithsteel,butcanbebrokenbyimproper
use. Dropping logs on the bottom refractory
and building fires directly against the refracto-
ries can cause premature burnout of these
components. It may easily be repaired or re-
placedatcostsfarbelowrepairandmaintenance
for masonry fireplaces.
Smoke spillage often occurs when a fire is first
started, until the fireplace and the chimney has
had the opportunity to “come up to tempera-
ture” and to begin to function normally. If
smoke spillage problems persist, a window
may be opened just a crack to allow the proper
flow of combustion air to the fireplace.
WARNING: BE AWARE THAT SAFETY
GLASS IS UNPREDICTABLE WHEN HOT
ANDMAYBREAK,EXPELLINGHOTGLASS
INTO THE ROOM. ADVISE ALL FAMILY
MEMBERS TO REMAIN WELL AWAY
FROM THE FIREPLACE WHEN OPERAT-
ING WITH DOORS CLOSED TO AVOID
ANY POSSIBLE PERSONAL INJURY.
Proper care and “burn-in” of the firebox will
prolong the period of enjoyment without exten-
sive maintenance. For the first few uses, build
small fires – not roaring infernos. The materials
usedintherefractoriescontainandabsorbmois-
ture. It is important to “cure” the refractories by
buildingonlymodestfires. Undernormalusage,
it is expected that hairline cracks will appear in
the refractory surface. These hairline cracks do
not affect the safe operation of the fireplace.
If your fireplace is equipped with an outside
combustion air kit, keep it open at all times
when fire is burning and close when fire is out
to prevent cold air intrusion.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
5
1. Inspect the opening in your chimney top and
remove any debris that could clog it. The cap is
usually held in place by four (4) screws, which
remove easily for checking or cleaning the full
length of the flue from above. Remove the
chimney top while wearing gloves to guard
against any sharp metal edges.
MAINTENANCE GUIDELINES
CREOSOTE FORMATION AND REMOVAL
When wood is burned slowly, it produces tar
and other organic vapors, which combine with
expelled moisture to form creosote. The creo-
sote vapors condense in the relatively cool
chimney flue of a slow-burning fire. As a result,
creosote residue accumulates on the flue lin-
ing. When ignited, this creosote makes an
extremely hot fire.
Your fireplace is designed to operate trouble-
free with minimum maintenance. However, like
any fine appliance, it deserves and requires
some housekeeping attention.
Your fireplace will perform better – and cer-
tainly look more attractive to family and friends
– if it is cleaned before each use. Before the first
seasonal use in Autumn and after the last fire in
Spring, it is important to inspect the fireplace
system carefully. We recommend at least two
complete fireplace inspections a year.
2. Inspect the entire flue from the top down for
obstructions such as birds nests, leaves, etc.
This may be done by using a flexible handled
chimney cleaning brush. If the chimney con-
tainsoffset/returnelbows;asoftbrushcleaning
from the top down to any elbow and then from
the firebox up to the offset/return section is the
proper method. The beam from a powerful
flashlight will help in this inspection.
The chimney should be inspected at least twice
yearly during the heating season to determine
if a creosote build-up has occurred.
If creosote has accumulated, it should be re-
moved to reduce the risk of a chimney fire.
Before Each Use
1. Clean the firebox of excessive ashes. Some
owners prefer to leave a small layer to insulate
the cold refractory below the grate which helps
fire starting.
Ifcreosotebuild-upisfound, donotusechemi-
cal chimney cleaners that are poured on a hot
fire. The chemical cleaners can be dangerous
and generally only work on the flue section
nearest the fire, leaving the rest of the flue
unaffected.Itisbesttotakethetimetocleanthe
flue as previously described or have the chim-
ney professionally cleaned by a qualified
chimney sweep.
3. Look up from inside the fireplace (damper
open) to see any obstructions in the lower flue
area. If present, shut the damper and glass
doors (if installed) to seal the firebox and con-
tain any soot that might fall.
This fireplace has a factory supplied grate at-
tached, it is permissible to remove the grate for
cleaning; however, the grate must be re-at-
tached to the fireplace before the next burn.
If your do not have glass doors installed, a
damp sheet covering the fireplace opening and
sealedwithmaskingtapewilldo.Thencleanthe
flue from the top down (if an offset system,
clean per Step 2) using a proper size chimney
brush with flexible pole sections. Don’t open
the doors or remove the sheet until all soot has
settled. Vacuum, don’t sweep.
2. Keep the fireplace screens clean so combus-
tion air flows freely.
TROUBLESHOOTING
No Smoking Allowed
Your new fireplace is designed not to smoke if
properly installed and operated per our in-
structions. If you do experience a problem,
here are several things to check:
3. Spot check the brick-like refractory for small
cracks. Heat from the fire expands it slightly.
When it cools, it contracts.
4. Check the metal flashing and seals around
your chimney. Seal any cracks or loose nail-
head openings to prevent roof leaks.
Refractories should be replaced when:
1. Remember – always check to ensure your
flue damper is in the open position before
lighting a fire!
1. The crack opens more than ¹⁄₄" (19 mm).
5. Clean the firebox thoroughly by using a soft
brush or equivalent.
2. Pitting in the surface is extensive and pits
2. When lighting your fire, a little smoke may
escape into the room – more likely if the
chimney is cold. To correct this, hold a lighted
newspaper up inside the firebox near the open
flue damper. This will turn around any down-
draft and clear the flue of cold air. As your log
fire burns below, the updraft will improve as
the chimney heats up.
become deeper than ³⁄₁₆" (4.76 mm).
WARNING: CONTINUED OVER FIRING
CAN PERMANENTLY DAMAGE YOUR
FIREPLACE SYSTEM. SOME EXAMPLES
OF OVERFIRING ARE:
3.Anypieceofrefractorylargerthan2"(51mm)
in radius and ³⁄₁₆" deep becomes dislodged.
If conditions 1, 2 or 3 occur, the refractory
should be replaced.
• BURNING QUANTITIES OF SCRAP
LUMBER, PINEBRANCHES, PAPEROR
CARDBOARD BOXES WHICH EXCEED
THE VOLUME OF THE NORMAL LOG
FIRE.
TWICE A YEAR CHECK-UP
3. Is your fire too far forward? Move it toward
the back with your poker. Keep the fire well
within the confines of your fuel grate.
Normally, twice a year, you should inspect your
fireplace following this list:
• BURNING TRASH, CHEMICALS OR
CHEMICALLY TREATED COMBUS-
TIBLES.
4. Keep your fire up on the grate and the refrac-
torybelowfreeofexcessiveashes.Thefireneeds
plenty of air movement around the logs.
6
5. If smoking occurs an hour or two after
lighting the fire, perhaps your well-insulated
house is too airtight and there is scarcely any
way for replacement air to enter and feed the
fire. Check to see if your outside combustion
air kit (if installed) is open. Check outside to
ensure no obstructions are in front of exterior
air entry. Open a window slightly, open doors
to one or two rooms and see if this stops the
smoking.
7. Is your wood fuel too wet or unseasoned?
Ordoesitcontainsomechemicalsubstancethat
causes sputtering, smoking and toxic fumes?
REPLACEMENT PARTS
A complete parts list is found at the end of this
manual. Use only parts supplied from the
manufacturer.
8. Figure 5 illustrates the correct height of
yourchimneytop. Itisunlikelythatyourinstal-
lation does not adhere to the installation
instructions. However, if not correct, you
could experience an unusual downdraft. Usu-
ally,thebestsolutionistoincreasethechimney
height. This may also be necessary if nearby
trees, adjoining roof lines or a hill is causing a
downdraft condition.
Normally, all parts should be ordered through
your Lennox dealer. Parts will be shipped at
prevailing prices at time of order.
When ordering repair parts, always give the
following information:
6. Is a vent fan, exhaust hood or central
heating/cooling system stealing combustion
air from your fireplace? If their volume is high
enough, this can cause negative pressure and
an unwanted downdraft – and smoking.
1. The model number of the appliance.
2. The serial number of the appliance.
3. The part number.
4. The description of the part.
5. The quantity required.
9. Remember, your fireplace has been de-
signed as a supplemental heating device only,
it is not intended to heat your entire home.
6. The installation date of the appliance.
Less Than 10' (3m)
ACCESSORY COMPONENTS
2' Min. (610mm) 2' Min. (610mm)
2' Min.
(610mm)
3' Min.
(916mm)
12M17
12M18
12M19
36LBF
36LBF-BB
36LBF-BS
Figure 5
Bi-Fold Glass Doors
WARRANTY
Bi-Fold Doors
This fireplace is covered by a limited warranty detailed separately from this document.
Retain this manual. File it with your other documents for future reference.
Your fireplace can be fitted with beautiful bi-
fold doors. Model LBF doors are available for
usewiththesefireplace. Doorsareeasilyfitted
to the fireplace opening. Model LBF doors
come with standard black finish. Model LBF-
BB doors have a beautiful bright brass finish.
Model LBF-BS are made of stainless steel.
PRODUCT REFERENCE INFORMATION
We recommend that you record the following important information about your fireplace. Please
contact your Lennox dealer for any questions or concerns. For the number of your nearest Lennox
dealer, please call 1-800-9-LENNOX
To ensure warranty and to prevent a potential
fire hazard, do not use any other doors on
these appliances.
Your Fireplace's Model Number _______________________________________
Your Fireplace's Serial Number ________________________________________
The Date On Which Your Fireplace Was Installed __________________________
Your Dealer's Name_________________________________________________
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
7
REPLACEMENT PARTS
COL-3629
Part No. Qty.
COL-3629H
No.
DESCRIPTION
Part No. Qty.
Fireplace Assembly
–
–
2
2
1
1
1
1
1
1
1
1
–
–
2
2
1
1
1
1
1
1
1
1
1.
2.
3.
Firescreen
19M28
19M29
19M25
–
30M31
19M29
–
Rod, Screen
Refractory, Side, Right (Traditional)
Refractory, Side, Right (Herringbone)
Refractory, Side, Left (Traditional)
Refractory, Side, Left (Herringbone)
Refractory, Rear (Traditional)
Refractory, Rear (Herringbone)
Refractory Base
20M33
–
4.
5.
19M24
–
20M32
–
19M26
–
20M34
19M23
19M27
6.
7.
19M23
19M27
Grate
Lennox reserves the right to make changes at any time, without notice, in design,
materials, specifications, prices and also to discontinue colors, styles and products.
Consult your local distributor for fireplace code information.
Printed in U.S.A. © 2001 by LENNOX HEARTH PRODUCTS
1110 West Taft Avenue
Orange, CA 92865
P/N 875,005M REV. D 04/2006
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