UNVENTED (VENT-FREE) GAS LOG HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
24" THERMOSTAT MODELS CDR3924NT AND CDR3924PT
WARNING: If the information in this manual is not fol-
lowed exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
— Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediatelycallyourgassupplierfromaneighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
— Installationandservicemustbeperformedbyaquali-
fied installer, service agency or the gas supplier.
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SAFETY INFORMATION
WARNING: This appliance
is for installation only in a
solid-fuel burning fireplace or
approved ventless firebox en-
closure.
WARNING: This product
contains and/or generates
chemicals known to the State
of California to cause cancer or
birthdefects,orotherreproduc-
tive harm.
WARNING:Donotallowfans
toblowdirectlyintothefireplace.
Avoidanydraftsthatalterburner
flame patterns. Ceiling fans can
create drafts that alter burner
flame patterns. Altered burner
patterns can cause sooting.
IMPORTANT: Read this owner’s
manualcarefullyandcompletely
before trying to assemble, op-
erate, or service this heater.
Improper use of this heater can
cause property damage and
serious injury or death from
burns, fire, explosion, electrical
shock, and carbon monoxide
poisoning.
Due to high temperatures, the
applianceshouldbelocatedout
oftrafficandawayfromfurniture
and draperies.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the heater.
DANGER:Carbonmonoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of
carbon monoxide poisoning resemble the flu, with
headaches, dizziness, or nausea. If you have these
signs, the heater may not be working properly. Get
fresh air at once! Have heater serviced. Some
people are more affected by carbon monoxide
than others. These include pregnant women,
people with heart or lung disease or anemia, those
under the influence of alcohol, and those at high
altitudes.
Heaterbaseassemblybecomes
very hot when running heater.
Keep children and adults away
from hot surface to avoid burns
or clothing ignition. Heater
will remain hot for a time after
shutdown.Allowsurfacetocool
before touching.
Natural and Propane/LP Gas: Natural and pro-
pane/LPgases are odorless.An odor-making agent
is added to the gas. The odor helps you detect a gas
leak. However, the odor added to the gas can fade.
Gas may be present even though no odor exists.
Carefully supervise young chil-
dren when they are in the room
with heater.
Make certain you read and understand all warn-
ings. Keep this manual for reference. It is your
guide to safe and proper operation of this heater.
You must operate this heater
with a fireplace screen in place.
Make sure fireplace screen is
closed before running heater.
WARNING: Any change to
this heater or its controls can
be dangerous.
Keep the appliance area clear
and free from combustible ma-
terials,gasoline,andotherflam-
mable vapors and liquids.
WARNING: Do not use a
blower insert, heat exchanger
insert,orotheraccessorynotap-
proved for use with this heater.
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10. Thisheaterneedsfresh, outsideairventilationto
run properly. This heater has an Oxygen Deple-
tion Sensing (ODS) safety shutoff system. The
ODS shuts down the heater if enough fresh air
is not available. See Air for Combustion and
Ventilation, page 5. If heater keeps shutting off,
see Troubleshooting, page 20.
SAFETY INFORMATION
Continued
1. This appliance is only for use with the type
of gas indicated on the rating plate. This ap-
pliance is not convertible for use with other
gases.
2. Do not place propane/LP supply tank(s) in-
side any structure. Locate propane/LP supply
tank(s) outdoors.
11. Do not run heater
• where flammable liquids or vapors are used
or stored
• under dusty conditions
3. If you smell gas
• shut off gas supply
12. Do not use this heater to cook food or burn
paper or any other type of solid fuels.
• do not try to light any appliance
• do not touch any electrical switch; do not use
any phone in your building
13. Do not use heater if any part has been exposed
to or under water. Immediately call a qualified
service technician to inspect the room heater
andtoreplaceanypartofthecontrolsystemand
any gas control which has been under water.
• immediately call your gas supplier from a
neighborʼs phone. Follow the gas supplierʼs
instructions
• if you cannot reach your gas supplier, call
the fire department
14. Do not operate heater if any log is broken. Do
not operate heater if a log is chipped (dime-
sized or larger).
4. This heater shall not be installed in a bedroom
or bathroom, unless installed as a vented ap-
pliance.
15. Turn heater off and let cool before servicing,
installing, or repairing.Only a qualified ser-
vice person should install, service, or repair
heater.
5. Before installing in a solid fuel burning
fireplace, the chimney flue and firebox must
be cleaned of soot, creosote, ashes and loose
paint by a qualified chimney cleaner. Creosote
will ignite if highly heated. A dirty chimney
flue may create and distribute soot within
the house. Inspect chimney flue and firebox
for damage. If damaged, repair flue before
operating heater.
16. Operating heater above elevations of 4,500
feet may cause pilot outage.
17. To prevent performance problems with pro-
pane/LP models, do not use propane/LP fuel
tank of less than 100 lb. capacity.
18. Provide adequate clearances around air
openings.
6. Do not burn solid-fuel in a masonry or UL127
factory-built fireplace in which a vent-free
room heater is installed.
LOCAL CODES
Install and use heater with care. Follow all local
codes. In the absence of local codes, use the lat-
est edition of The National Fuel Gas Code ANSI
Z223.1/NFPA 54*.
7. If fireplace has glass doors, never operate this
heater with glass doors closed. If you operate
heater with doors closed, heat buildup inside
fireplace will cause glass to burst. Make sure
there are no obstructions across openings of
fireplace.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
8. To prevent the creation of soot, follow the
instructions in Cleaning and Maintenance,
page 19.
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
9. Before using furniture polish, wax, carpet
cleaner, or similar products, turn heater off.
If heated, the vapors from these products may
create a white powder residue within burner
box or on adjacent walls and furniture.
Note: Where listed vented decorative logs are
required, thermostat operation is not permitted.
4
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SAFETY DEVICE
PRODUCT
IDENTIFICATION
This heater has a pilot with an Oxygen Deple-
tion Sensing (ODS) safety shutoff system. The
ODS/pilot is a required feature for vent-free room
heaters. The ODS/pilot shuts off the heater if there
is not enough fresh air.
Log Set
IGNITION SYSTEM
This heater has an electronic ignitor to light heater
fuel supply.
AIR FOR COMBUSTION
AND VENTILATION
Ignitor
WARNING: This heater shall
not be installed in a confined
spaceorunusuallytightconstruc-
tionunlessprovisionsareprovid-
ed for adequate combustion and
ventilationair.Readthefollowing
instructionstoinsureproperfresh
air for this and other fuel-burning
appliances in your home.
Burner
Control Knob
Grate
Base
Assembly
Figure 1 - Product Identification
UNPACKING
CAUTION:Donotremovethe
data plates from the base as-
sembly. The data plates contain
important warranty and safety
information.
Todayʼs homes are built more energy efficient
than ever. New materials, increased insulation and
new construction methods help reduce heat loss
in homes. Home owners weather strip and caulk
around windows and doors to keep the cold air out
and the warm air in. During heating months, home
owners want their homes as airtight as possible.
1. Remove logs and heater base assembly from
carton. Note: Do not pick up heater base as-
sembly by burners. This could damage heater.
Always handle base assembly by the sides of
assembly.
While it is good to make your home energy effi-
cient, your home needs to breathe. Fresh air must
enter your home.All fuel-burning appliances need
fresh air for proper combustion and ventilation.
2. Remove all protective packaging applied to
logs and heater for shipment.
Exhaust fans, fireplaces, clothes dryers and fuel
burning appliances draw air from the house to
operate. You must provide adequate fresh air for
these appliances. This will insure proper venting
of vented fuel-burning appliances.
3. Check all items for any shipping damage. If
damaged, promptly inform dealer where you
bought heater.
PROVIDING ADEQUATE
VENTILATION
The following are excerpts from National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Section 5.3,
Air for Combustion and Ventilation.
PRODUCT FEATURES
OPERATION
This heater is clean burning. It requires no outside
venting. There is no heat loss out a vent or up a
chimney. Heat is generated by both realistic flames
and glowing coals. This heater is designed for vent-
free operation with flue damper closed. It has been
tested and approved toANSI Z21.11.2 standard for
unvented heaters. State and local codes in some
areas prohibit the use of vent-free heaters.
All spaces in homes fall into one of the three fol-
lowing ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 5 through 7 will help
you classify your space and provide adequate
ventilation.
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DETERMINING FRESH-AIR FLOW
FOR HEATER LOCATION
AIR FOR COMBUSTION
AND VENTILATION
Determining if You Have a Confined or
Unconfined Space
Use this work sheet to determine if you have a
Continued
Unusually Tight Construction
The air that leaks around doors and windows
may provide enough fresh air for combustion and
ventilation. However, in buildings of unusually
tight construction, you must provide additional
fresh air.
confined or unconfined space.
Space: Includes the room in which you will install
heater plus any adjoining rooms with doorless pas-
sageways or ventilation grills between the rooms.
1. Determine the volume of the space (length x
width x height).
Unusually tight construction is defined as
construction where:
Length x Width x Height =__________cu. ft.
(volume of space)
a. walls and ceilings exposed to the out-
side atmosphere have a continuous
water vapor retarder with a rating of
one perm (6 x 10-11 kg per pa-sec-m2) or
less with openings gasketed or sealed
and
Example: Space size 20 ft. (length) x 16 ft.
(width) x 8 ft. (ceiling height) = 2560 cu. ft.
(volume of space)
If additional ventilation to adjoining room is
supplied with grills or openings, add the volume
of these rooms to the total volume of the space.
b. weather stripping has been added on
openable windows and doors and
2. Multiply the space volume by 20 to determine
the maximum Btu/Hr the space can support.
c. caulking or sealants are applied to
areas such as joints around window
and door frames, between sole plates
and floors, between wall-ceiling joints,
between wall panels, at penetrations
for plumbing, electrical and gas lines
and at other openings.
__________ (volume of space) x 20 = (Maxi-
mum Btu/Hr the space can support)
Example: 2560 cu. ft. (volume of space) x 20 =
51,200 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in
the space.
Vent-free heater
Gas water heater*
Gas furnace
___________ Btu/Hr
___________ Btu/Hr
___________ Btu/Hr
___________ Btu/Hr
___________ Btu/Hr
__________ Btu/Hr
If your home meets all of these three cri-
teria, you must provide additional fresh
air. See Ventilation Air From Outdoors,
page 7.
Vented gas heater
Gas fireplace logs
Gas water heater
If your home does not meet all of the three
criteria above, proceed to Determining
Fresh-Air Flow For Heater Location.
Other gas appliances* + __________ Btu/Hr
Total = __________ Btu/Hr
Confined and Unconfined Space
* Do not include direct-vent gas appliances. Di-
rect-vent draws combustion air from the outdoors
and vents to the outdoors.
TheNationalFuelGasCode,ANSIZ223.1/NFPA54
defines a confined space as a space whose volume
is less than 50 cubic feet per 1,000 Btu per hour
(4.8 m3 per kw) of the aggregate input rating of all
appliances installed in that space and an unconfined
space as a space whose volume is not less than 50
cubic feet per 1,000 Btu/Hr (4.8 m3 per kw) of the
aggregate input rating of all appliances installed in
that space. Rooms communicating directly with the
spaceinwhichtheappliancesareinstalled*, through
openings not furnished with doors, are considered
a part of the unconfined space.
Example:
40,000
__________ Btu/Hr
39,000
+__________ Btu/Hr
79,000
=__________ Btu/Hr
Gas water heater
Vent-free heater
Total
4. Compare the maximum Btu/Hr the space can
support with the actual amount of Btu/Hr used.
_________Btu/Hr (maximum the space can support)
_________Btu/Hr (actual amount of Btu/Hr used)
Example: 51,200 Btu/Hr (maximum the space
can support)
* Adjoining rooms are communicating only if
there are doorless passageways or ventilation grills
between them.
79,000 Btu/Hr (actual amount of
Btu/Hr used)
The space in the above example is a confined space
because the actual Btu/Hr used is more than the maxi-
mum Btu/Hr the space can support. You must provide
additional fresh air. Your options are as follows:
6
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AIR FOR COMBUSTION
12"
AND VENTILATION
Continued
Ventilation
Grills
Into Adjoining
Room,
Ventilation Grills
Into Adjoining Room,
Option 2
A. Rework worksheet, adding the space of an adjoin-
ingroom. Iftheextraspaceprovidesanunconfined
space, remove door to adjoining room or add
ventilation grills between rooms. See Ventilation
Air From Inside Building.
Or
Remove
Door into
Adjoining
Room,
Option
3
Option 1
B. Vent room directly to the outdoors. See Ventila-
tion Air From Outdoors, page 7.
12"
C. Install a lower Btu/Hr heater, if lower Btu/Hr size
makes room unconfined.
If the actual Btu/Hr used is less than the maximum
Btu/Hr the space can support, the space is an un-
confined space. You will need no additional fresh
air ventilation.
Figure 2 - Ventilation Air from Inside
Building
WARNING:Iftheareainwhich
the heater may be operated is
smaller than that defined as
an unconfined space or if the
building is of unusually tight
construction, provide adequate
combustion and ventilation air
byoneofthemethodsdescribed
in the National Fuel Gas Code,
ANSIZ223.1/NFPA54Section5.3
or applicable local codes.
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills or
ducts. You must provide two permanent openings:
one within 12" of the ceiling and one within 12"
of the floor. Connect these items directly to the
outdoors or spaces open to the outdoors. These
spaces include attics and crawl spaces. Follow the
National Fuel Gas Code, ANSI Z223.1/NFPA 54,
Section 5.3, Air for Combustion and Ventilation for
required size of ventilation grills or ducts.
IMPORTANT: Do not provide openings for inlet
or outlet air into attic if attic has a thermostat-
controlled power vent. Heated air entering the attic
will activate the power vent.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining un-
confined space. When ventilating to an adjoining
unconfined space, you must provide two perma-
nent openings: one within 12" of the ceiling and
one within 12" of the floor on the wall connecting
the two spaces (see options 1 and 2, Figure 2). You
can also remove door into adjoining room (see
option 3, Figure 2). Follow the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for
Combustion and Ventilation for required size of
ventilation grills or ducts.
Ventilated
Outlet
Attic
Air
Outlet
Air
To Attic
To
Crawl
Space
Inlet
Air
Ventilated
Inlet Air
Crawl Space
Figure 3 - Ventila tion Air from Outdoors
113183-01A
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INSTALLATION
WARNING: Seal any fresh
air vents or ash clean-out doors
located on floor or wall of fire-
place. If not, drafting may cause
pilot outage or sooting. Use a
heat-resistant sealant. Do not
seal chimney flue damper.
NOTICE:Thisheaterisintended
for use as supplemental heat.
Use this heater along with your
primary heating system. Do not
install this heater as your pri-
mary heat source. If you have a
centralheatingsystem,youmay
run system’s circulating blower
whileusingheater.Thiswillhelp
circulatetheheatthroughoutthe
house. In the event of a power
outage, you can use this heater
as your primary heat source.
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing, or other flammable
objectsarelessthan42inches
from the front, top, or sides of
the firebox opening
WARNING: Installation and
repair should be done by a
qualified service person. The
appliance should be inspected
before use and at least annu-
ally by a professional service
person. More frequent cleaning
may be required due to exces-
sivelintfromcarpeting,bedding
material,etc.Itisimperativethat
control compartments, burners
andcirculatingairpassageways
of the appliance be kept clean.
• in high traffic areas
• in windy or drafty areas
CAUTION: This heater cre-
ates warm air currents. These
currents move heat to wall sur-
faces next to heater. Installing
heater next to vinyl or cloth wall
coverings or operating heater
where impurities (such as, but
not limited to, tobacco smoke,
aromatic candles, cleaning flu-
ids,oilorkerosenelamps,etc.)in
the air exist, may discolor walls
or cause odors.
WARNING: Before installing
in a solid fuel burning fireplace,
the chimney flue and firebox
must be cleaned of soot, creo-
sote, ashes and loose paint by
a qualified chimney cleaner.
Creosote will ignite if highly
heated. A dirty chimney flue
may create and distribute soot
within the house. Inspect chim-
neyflueandfireboxfordamage.
If damaged, repair flue before
operating heater.
IMPORTANT: Vent-free heaters add moisture to
the air.Although this is beneficial, installing heater
in rooms without enough ventilation air may cause
mildew to form from too much moisture. See Air
for Combustion and Ventilation, page 5.
CHECK GAS TYPE
Use the correct gas type (natural or propane/LP)
for your unit. If your gas supply is not correct, do
not install fireplace. Call dealer where you bought
fireplace for proper type fireplace.
WARNING: This appliance
is equipped for (natural or pro-
pane/LP) gas. Field conversion
is not permitted.
8
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Minimum Noncombustible Material
Clearances
If Not Using Mantel
INSTALLATION
Continued
INSTALLATION AND CLEARANCES
FOR VENT-FREE OPERATION
Note:If using a mantel proceed to If Using Mantel.
If not using a mantel, follow the information on
this page.
WARNING: Maintain the
minimum clearances. If pos-
sible,providegreaterclearances
fromfloor,ceiling,andadjoining
wall.
You must have noncombustible material(s) above
the fireplace opening. Noncombustible materials
(such as slate, marble, tile, etc.) must be at least
1/2 inch thick. With sheet metal, you must have
noncombustible material behind it. Noncom-
bustible material must extend at least 8" up. If
noncombustible material is less than 12", you must
install the fireplace hood accessory. See Figure 5
for minimum clearances.
LOG SIZING REQUIREMENTS
Log
Size
Minimum Firebox
If Using Mantel
Height
Depth Front Rear *
Width Width
You must have noncombustible material(s) above
the fireplace opening. Noncombustible materials
(such as slate, marble, tile, etc.) must be at least
1/2 inch thick. With sheet metal, you must have
noncombustible material behind it. Noncombus-
tible material must extend at least 8 inches up.
If noncombustible material is less than 12", you
must install the fireplace hood accessory. Even if
noncombustible material is more than 12", you
may need the hood accessory to deflect heat away
from your mantel shelf. See Figure 5 and Figures 6
and 7, page 10, for minimum clearances.
24"
* Measured at 14" depth.
17"
14"
28"
20 1/4"
Carefully follow the instructions below. This will
ensure safe installation into a masonry, UL127-
listed manufactured fireplace, or listed vent-free
firebox.
Minimum Clearances For Side Combustible
Material, Side Wall, and Ceiling
A. Clearances from the side of the fireplace
cabinet to any combustible material and wall
should follow diagram in Figure 4.
IMPORTANT: If you cannot meet these minimum
clearances, you must operate heater with chimney
flue damper open.
Example: The face of a mantel, bookshelf,
etc. is made of combustible material and
1
2
protrudes 3 / " from the wall. This combus-
Noncombustible
Requirements for
tible material must be 4" from the side of the
fireplace cabinet (see Figure 4).
Material Distance (A) Safe Installation
12" or more
Noncombustible material
Note: When installing your gas logs into
a manufactured firebox, follow firebox
manufacturerʼs instructions for minimum
clearances to combustible materials.
okay.
Between 8"
and 12"
Install fireplace hood
accessory (GA6050,
GA6052, or GA6053 see
Accessories, page 34).
Noncombustible material
must be extended to at
least 8". See Between 8"
and 12", above. If you
cannot extend material,
you must operate heater
B. Clearances from the top of the fireplace open-
ing to the ceiling should not be less than 42
inches.
Less than 8"
Example
*
*Minimum 16 inches from Side Wall
Figure 4 - Minimum Clearance for
Combustible to Wall
Figure 5 - Heat Resistant Material (Slate,
Marble, Tile, etc.) Above Fireplace
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Mantel Shelf
INSTALLATION
10"
8"
Underside of
Mantel Shelf
Continued
6"
2 1/2"
MANTEL CLEARANCES
In addition to meeting noncombustible material
clearances, you must also meet required clearances
between fireplace opening and mantel shelf. If
you do not meet the clearances listed below, you
will need a hood.
All minimum
distances are
in inches
Minimum Non-
Combustible
Material
(A)
Log Set
All Models
12"
18"
20"
22"
24"
Determining Minimum Mantel Clearance
If you meet minimum clearance between mantel
shelf and top of fireplace opening, a hood is not
required (see Figure 6).
Top of Fireplace
Opening
Minimum Non-
Combustible
Material Height
Distances to
Underside of
Mantel
Determining Minimum Mantel Clearance
When Using a Hood
If minimum clearances in Figure 6 are not met, you
must have a hood. When using a hood there are
still certain minimum mantel clearances required.
Follow minimum clearances shown in Figure 7
when using hood.
Figure 6 - Minimum Mantel Clearances
Without Using Hood
Mantel Shelf
12"
10"
8"
Underside
of Mantel
Shelf
NOTICE: Surface temperatures
of adjacent walls and mantels
become hot during operation.
Walls and mantels above the
firebox may become hot to
the touch. If installed properly,
these temperatures meet the
requirement of the national
product standard. Follow all
minimum clearances shown in
this manual.
6"
2 1/2"
All minimum
distances are
in inches
Minimum
Noncombustible
Material
8"
12" 15"
18" 20"
Min.
Top of
Fireplace
Opening
Hood
Distances to
Underside of
Mantel
(GA6050,
GA6052 or
GA6053)
Figure 7 - Minimum Mantel Clearances
When Using Hood
NOTICE:Ifyourinstallationdoes
not meet the minimum clear-
ances shown, you must do one
of the following:
• operate the logs only with the
flue damper open
Combustible
Material
14"
Min.
• raise the mantel to an accept-
able height
Noncombustible Material
• remove the mantel
Figure 8 - Minimum Fireplace Clearances
If Installed at Floor Level
FLOOR CLEARANCES
A. If installing appliance on the floor level, you
must maintain the minimum distance of 14"
to combustibles (see Figure 8).
Hearth
Combustible
Material
B. If combustible materials are less than 14" to
the fireplace, you must install appliance at
least 5" above the combustible flooring (see
Figure 9).
5"
Min.
Figure 9 - Minimum Fireplace Clearances
Above Combustible Flooring
10
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2. Locate two masonry screws in hardware
package.
INSTALLATION
Continued
3. Place heater base in fireplace.
INSTALLING HEATER BASE
ASSEMBLY
4. Place logs in their proper position on heater
base (see Installing Logs, page 14).
5. Center heater base and logs front-to-back and
side-to-side in fireplace.
WARNING:You must secure
this heater to fireplace floor. If
not, heater will move when you
adjust controls. Moving heater
may cause a gas leak.
6. Carefully remove logs without moving heater
base.
7. Mark screw locations through one hole on
each side of the mounting bracket (see Figure
11). If installing in a brick-bottom fireplace,
mark screw locations in mortar joint of
bricks.
WARNING: If installing in a
sunken fireplace, special care
is needed. You must raise the
fireplace floor to allow access to
heater control panel. This will in-
sure adequate air flow and guard
against sooting and controls be-
ingdamaged.Raisefireplacefloor
with noncombustible material.
Make sure material is secure.
8. Remove heater base from fireplace. If install-
ing optional control accessories, do so at this
time. Follow all directions provided with
accessory.
9. Drill holes at marked locations using 3/16"
drill bit.
10. Attach base assembly to fireplace floor using
two masonry screws (in hardware package).
Flexible Gas
Hose (if allowed
by local codes)
Fitting
CAUTION: Do not pick up
heater base assembly by burn-
ers. This could damage heater.
Only handle base assembly by
sides of base.
IMPORTANT: Make sure the heater burners are
level. If heater is not level, heater will not work
properly.Avoid damage to thermostat bulb.Avoid
nicks or sharp bends in thermostat bulb wire. Keep
thermostat bulb in mounting bracket until ready
to mount base to floor. See Optional Positioning
of Thermostat Sensing Bulb, page 24.
Figure 10 - Attaching Flexible Gas Hose
to Heater
Installation Items Needed
•
hardware package (provided with heater)
•
approved flexible gas hose and fitting (not
provided) (if allowed by local codes)
Mounting
Flange
•
•
•
sealant (resistant to propane/LP gas, not pro-
vided)
Masonry
Screw
electric drill with 3/16" drill bit (metal or ma-
sonry as applicable)
Figure 11 - Attaching Base Assembly to
Fireplace Floor
flathead screwdriver
1. Connect fitting to base as shown in Figure 10.
Connect approved flexible gas hose to fitting
in base (see Figure 10).
IMPORTANT: Hold gas fitting with wrench
when connecting flexible gas hose.
113183-01A
11
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INSTALLATION
WARNING: For natural
gas, never connect heater to
private (non-utility) gas wells.
This gas is commonly known
as wellhead gas.
Continued
CONNECTING TO GAS SUPPLY
WARNING: This appliance
requires a 1/2" NPT (National
PipeThread)inletconnectionto
the pressure regulator.
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
your local codes. Use pipe of
1/2" inside diameter or greater
to allow proper gas volume to
heater.Ifpipeistoosmall,undue
loss of volume will occur.
WARNING: A qualified ser-
vicepersonmustconnectheater
to gas supply. Follow all local
codes.
CAUTION: For propane/LP
gas, never connect heater di-
rectly to the propane/LP supply.
This heater requires an external
regulator (not supplied). Install
theexternalregulatorbetweenthe
heater and propane/LP supply.
Installation must include an equipment shutoff
valve, union, and plugged 1/8" NPT tap. Locate
NPT tap within reach for test gauge hook up. NPT
tap must be upstream from heater (see Figure 13,
page 13).
IMPORTANT: Install equipment shutoff valve
in an accessible location. The equipment shutoff
valve is for turning on or shutting off the gas to
the appliance.
Installation Items Needed
Before installing heater, make sure you have the
items listed below.
Check building codes for any special require-
ments for locating equipment shutoff valve to
fireplaces.
•
external regulator for propane/LP only (sup-
plied by installer)
•
•
•
•
•
•
•
piping (check local codes)
sealant (resistant to propane/LP gas)
equipment shutoff valve *
test gauge connection *
sediment trap
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from
going into pipe. Excess sealant in pipe could result
in clogged heater valves.
WARNING: Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.
tee joint
pipe wrench
*ACSAdesign-certified equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. Purchase the optional CSA
design-certified equipment shutoff valve from your
dealer. See Accessories, page 25.
Propane/LP
Supply Tank
External
Regulator
For propane/LP only, the installer must supply
an external regulator. The external regulator will
reduce incoming gas pressure. You must reduce
incoming gas pressure to between 11 and 14 inches
of water. If you do not reduce incoming gas pres-
sure, heater regulator damage could occur. Install
external regulator with the vent pointing down
as shown in Figure 12. Pointing the vent down
protects it from freezing rain or sleet.
Vent
Pointing
Down
Figure 12 - External Regulator With Vent
Pointing Down
12
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113183-01A
CHECKING GAS CONNECTIONS
INSTALLATION
Continued
WARNING: Test all gas pip-
ing and connections, internal
and external to unit, for leaks
afterinstallingorservicing.Cor-
rect all leaks at once.
We recommend that you install a sediment trap in
supply line as shown in Figure 13. Locate sediment
trap where it is within reach for cleaning. Install
in piping system between fuel supply and heater.
Locate sediment trap where trapped matter is not
likely to freeze.Asediment trap traps moisture and
contaminants. This keeps them from going into
heater controls. If sediment trap is not installed or
is installed wrong, heater may not run properly.
WARNING: Never use an
open flame to check for a leak.
Applyanoncorrosiveleakdetec-
tion fluid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
CAUTION: Avoid damage to
regulator. Hold gas regulator
with wrench when connecting it
to gas piping and/or fittings.
CAUTION: Make sure exter-
nal regulator has been installed
between propane/LP supply
and heater. See guidelines un-
der Connecting to Gas Supply,
page 12.
Propane/LP - From
CSA Design-
External Regulator
(11" W.C.** to 14" W.C.
Pressure)
Natural - From Gas
Meter
(5" W.C.** to
10.5" W.C.
Pressure)
Certified Equipment
Shutoff Valve With
1/8" NPT Tap*
Approved Flexible
Gas Hose (if allowed PRESSURE TESTING GAS SUPPLY
by local codes)
PIPING SYSTEM
Test Pressures In Excess Of 1/2 PSIG
(3.5 kPa)
1. Disconnect appliance with its appliance main
gas valve (control valve) and equipment
shutoff valve from gas supply piping system.
Pressures in excess of 1/2 psig will damage
heater regulator.
3"
Minimum
Gas
Regulator
Tee Cap Pipe
Joint Nipple
2. Cap off open end of gas pipe where equipment
shutoff valve was connected.
Sediment Trap
Figure 13 - Gas Connection
3. Pressurize supply piping system by either
opening propane/LP supply tank valve for
propane/LP gas or opening main gas valve
located on or near gas meter for natural gas,
or using compressed air.
* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer. See
Accessories, page 25.
**Minimum inlet pressure for purpose of input
adjustment.
4. Check all joints of gas supply piping system.
Apply a noncorrosive leak detection fluid to
all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff valve
to gas supply. Check reconnected fittings for
leaks.
113183-01A
13
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6. Light heater (see Operating Heater, page 16).
INSTALLATION
Check all other internal joints for leaks.
Continued
7. Turn off heater (see To Turn Off Gas to Appli-
ance, page 17).
Test Pressures Equal To or Less Than
1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 14).
Thermostat Gas Valve or
Control Valve Location
Equipment
Shutoff Valve
2. Pressurize supply piping system by either
opening propane/LP supply tank valve for
propane/LP gas or opening main gas valve
located on or near gas meter for natural gas,
or using compressed air.
Gas Meter
3. Check all joints from gas meter for natural or
propane/LPsupply to equipment shutoff valve
(see Figure 15 or 16). Apply a noncorrosive
leak detection fluid to all joints. Bubbles form-
ing show a leak.
4. Correct all leaks at once.
Figure 16 - Checking Gas Joints (Natural
Gas Only)
PRESSURE TESTING HEATER GAS
CONNECTIONS
1. Open equipment shutoff valve (see Figure 14).
INSTALLING LOGS
2. Open main gas valve located on or near gas
meter for natural gas or open propane/LP
supply tank valve.
WARNING: Failure to posi-
tionthepartsinaccordancewith
these diagrams or failure to use
only parts specifically approved
with this heater may result in
property damage or personal
injury.
3. Make sure control knobs of heater are in the
OFF position.
4. Check all joints from equipment shutoff valve
to thermostat gas valve (see Figure 15 or 16).
Apply a noncorrosive leak detection fluid to
all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
CAUTION: After installation
andperiodicallythereafter,check
to ensure that no yellow flame
comes in contact with any log.
WiththeheatersettoHI,checkto
seeifflamescontactanylog.Ifso,
reposition logs according to the
loginstallationinstructionsinthis
manual.Yellowflamescontacting
logs will create soot.
Open
Equipment
Shutoff
Valve
Closed
Figure 14 - Equipment Shutoff Valve
Equipment Shutoff Valve
Thermostat Gas
Propane/LP
Supply Tank
Valve or Control
Valve Location
It is very important to install the logs exactly as
instructed. Do not modify logs. Only use logs sup-
plied with heater. Before installing logs, make sure
log alignment screws are in place and straight.
Figure 15 - Checking Gas Joints
(Propane/LP Gas Only)
14
113183-01A
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INSTALLATION
Crossover
Log #6
Continued
1. Place middle log (#1) onto log alignment
screw located near the center of base, and in
place over log support bracket as shown in
Figures 17 and 18.
Rear
Log #5
2. Place front log (#2) onto base. Position log
onto two alignment screws to the front of base
(see Figure 18).
3. Place left side log (#3) onto two log alignment
screws on left side of base (see Figure 18).
4. Place right side log (#4) onto two log alignment
screws on right side of base (see Figure 18).
5. Place rear log (#5) onto two alignment screws
to the rear of base (see Figures 17 and 19).
6. Place crossover log (#6) onto log alignment
pin on middle log (#1) and rear log (#5) (see
Figure 19).
Figure 19 - Installing Rear Log #5 and
Crossover Log #6
Rear Log
Left Log
ATTACHING GRATE TO BASE
ASSEMBLY
Locate the two slots in the front of the base as-
sembly. Carefully slide the decorative grate into
these slots (see Figure 20).
Log Support
Bracket
Front
Log
Middle
Right
Log
Log
Front Log
Figure 17 - Log Alignment Screws
Middle
Log #1
Left Log #3
Grate
Slots in Base
Front
Log #2
Figure 20 - Attaching Grate to Base
Assembly
Right
Log #4
ADDING LAVA ROCK
Place lava rock around base of heater if desired.
Be sure not to cover the control knobs or air inlet
openings on the front of heater.
Figure 18 - Installing Middle Log #1, Front
Log #2, Left Log #3 and Right Log #4
113183-01A
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LIGHTING
INSTRUCTIONS
OPERATING HEATER
FOR YOUR SAFETY READ
BEFORE LIGHTING
WARNING:
• If fireplace has glass doors,
never operate this heater with
glassdoorsclosed.Ifyouoper-
ate heater with doors closed,
heat buildup inside fireplace
will cause glass to burst. Also
iffireplaceopeninghasventsat
the bottom, you must open the
vents before operating heater.
• You must operate this heater
with a fireplace screen in
place. Make sure fireplace
screen is closed before run-
ning heater.
WARNING: If you do not fol-
low these instructions exactly,
a fire or explosion may result
causing property damage, per-
sonal injury or loss of life.
A. This appliance has a pilot which must be
lighted by hand. When lighting the pilot,
follow these instructions exactly.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than
air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not
use any phone in your building.
NOTICE:Duringinitialoperation
of new heater, burning logs will
give off a paper-burning smell.
Orange flame will also be pres-
ent. Open damper or window to
vent smell. This will only last a
few hours.
• Immediately call your gas supplier from
a neighborʼs phone. Follow the gas
supplierʼs instructions.
• If you cannot reach your gas supplier, call
the fire department.
C. Use only your hand to push in or turn the
gas control knob. Never use tools. If the
knob will not push in or turn by hand, donʼt
try to repair it, call a qualified service tech-
nician or gas supplier. Force or attempted
repair may result in a fire or explosion.
Note: Home owners generally prefer to op-
erate their heater with the chimney damper
closed. This will put all the heat into the room.
However, there may be times you will desire
the full flames of the HI heat setting but will
find the heat output excessive. You can open
the chimney damper (if you have one) fully or
partially to release some of the heat.
D. Do not use this appliance if any part has
been under water. Immediately call a
qualified service technician to inspect the
appliance and to replace any part of the
control system and any gas control which
has been under water.
WARNING: Damper handle
will be hot if heater has been
running.
1. STOP! Read the safety information column 1.
2. Make sure equipment shutoff valve is fully
open.
3. Turn control knob clockwise
OFF position.
to the
4. Wait five (5) minutes to clear out any gas.
Then smell for gas, including near the floor.
If you smell gas, STOP! Follow “B” in the
safety information, column 1. If you donʼt
smell gas, go to the next step.
16
113183-01A
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Ignitor
Electrode
OPERATING HEATER
Thermocouple
Continued
Pilot Burner
Pilot Burner
5. Turn control knob counterclockwise
to the PILOT position. Press in control
knob for five (5) seconds (see Figure 21).
Note: You may be running this heater for
the first time after hooking up to gas sup-
ply. If so, the control knob may need to be
pressed in for 30 seconds or more. This will
allow air to bleed from the gas system.
Thermocouple
Figure 22 - Pilot
(Propane/LP)
Figure 23 - Pilot
(Natural)
6. With thermostat control knob pressed in,
press and release ignitor button. This will
light pilot. The pilot is attached to the front
burner. If needed, keep pressing ignitor
button until pilot lights.
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. Turn control knob clockwise
to the
Note: If pilot does not stay lit, contact a
qualified service person or gas supplier for
repairs. Until repairs are made, light pilot
with match. To light pilot with match, see
Manual Lighting Procedure.
OFF position.
2. Turn rear burner control knob clockwise
to the OFF position.
Shutting Off Burners Only (pilot stays lit)
1. Turn control knob clockwise
to the
7. Keep control knob pressed in for30 seconds
after lighting pilot.After 30 seconds, release
control knob.
PILOT position.
2. Turn rear burner control knob clockwise
to the OFF position.
• If control knob does not pop out when
released, contact a qualified service person
or gas supplier for repairs.
THERMOSTAT CONTROL
OPERATION
Note: If pilot goes out, repeat steps 3
through 7. This heaterhas a safety interlock
system. Wait one (1) minute for system to
reset before lighting pilot again.
The thermostat control knob can be set to any
comfort level between HI and LO. The ther-
mostat will gradually modulate the heat output
and flame height from higher to lower settings,
or pilot, in order to maintain the comfort level
you select. The ideal comfort setting will vary
by household depending upon the amount of
space to be heated, the output of the central
heating system, etc.
8. Turn control knob counterclockwise
to desired heating level. The front burner
should light. Set control knob to any heat
level between HI and LO.
9. To light the rear yellow flame burner, push
in and turn rear burner control knob coun-
Note: Selecting the HI setting with the control
knob will cause the burner to remain fully on,
without modulating down in most cases.
terclockwise
to the ON position.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
MANUAL LIGHTING
PROCEDURE
1. Follow steps 1 through 5 under Lighting
Instructions, starting on page 16.
Ignitor Button
Rear Burner
Control Knob
Control Knob
2. Depress control knob and light pilot with
match.
3. Keep control knob pressed in for30 seconds
after lighting pilot.After 30 seconds, release
control knob. Now follow steps 8 and 9
under Lighting Instructions, column 1.
Figure 21 - Control Knob(s) and Ignitor
Button Locations
113183-01A
17
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INSPECTING BURNERS
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide. If burner flame pat-
ternsshowyellowtipping,follow
instructionsbelow.Yellowflame
on rear burner is normal.
Check pilot flame pattern and burner flame pat-
terns often.
PILOT FLAME PATTERN
Figure 24 shows a correct pilot flame pattern.
Figure 25 shows an incorrect pilot flame pattern.
The incorrect pilot flame is not touching the
thermocouple. This will cause the thermocouple
to cool. When the thermocouple cools, the heater
will shut down.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
orotherfineparticlesareburned
byheater, causingbriefpatches
of orange flame.
If pilot flame pattern is incorrect, as shown in
Figure 25
•
turn heater off (see To Turn Off Gas to Appli-
ance, page 17)
•
see Troubleshooting, pages 20
Note: The pilot flame on natural gas units will
have a slight curve, but the flame should be blue
and have no yellow or orange color.
If burner flame patterns are incorrect, as shown
in Figure 27
•
turn heater off (see To Turn Off Gas to Appli-
ance, page 17)
Thermocouple
Pilot Burner
Pilot Burner
•
see Troubleshooting, page 20
(Natural Gas)
(Propane/LP Gas)
Figure 24 - Correct Pilot Flame Pattern
(Your pilot may vary from pilots shown)
Figure 26 - Correct Burner Flame
Patterns
Pilot Burner
Thermocouple
Pilot Burner
Yellow Tipping At
Top of Blue Flame
(Natural Gas)
(Propane/LP Gas)
Figure 25 - Incorrect Pilot Flame Pattern
(Your pilot may vary from pilots shown)
BURNER FLAME PATTERNS
Figure 27 - Incorrect Burner Flame
Patterns
Figure 26 shows correct burner flame patterns.
Figure 27 shows incorrect burner flame patterns.
The incorrect burner flame patterns show yellow
tipping at top of blue flame.
TECHNICAL SERVICE
You may have further questions about installation,
operation, or troubleshooting. If so, contact DESA
Heating ProductsʼTechnical Service Department at
1-866-672-6040. When calling, please have your
model and serial numbers of your heater ready.
You can also visit DESAHeating Productsʼtechni-
18
113183-01A
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particles of dust, dirt, lint, or pet hair with a
soft cloth or vacuum cleaner nozzle.
CLEANING AND
MAINTENANCE
5. Blow air into the primary air holes on the
injector holders.
WARNING: Turn off heater
and let cool before cleaning.
6. In case any large clumps of dust have now been
pushed into the burner repeat steps 3 and 4.
Cleanthepilotassemblyalso.Ayellowtiponthepilot
flame indicates dust and dirt in the pilot assembly.
There is a small pilot air inlet hole about two inches
from where the pilot flame comes out of the pilot
assembly (see Figure 30). With the unit off, lightly
blowairthroughtheairinlethole.Theaccessholefor
propane/LPpilotisonthefrontoftheburnercarriange
as shown in Figure 30. The access hole for natural
pilot is behind the pilot bracket on the top of burner
carriage (see Figure 30). You may blow through a
drinking straw if compressed air is not available.
CAUTION:Youmustkeepcon-
trolareas,burners,andcirculating
air passageways of heater clean.
Inspect these areas of heater
before each use. Have heater
inspected yearly by a qualified
service person. Heater may need
more frequent cleaning due to
excessivelintfromcarpeting,pet
hair, bedding material, etc.
Injector Holder
Burner
Tube
WARNING: Failure to keep
the primary air opening(s) of
theburner(s)cleanmayresultin
sooting and property damage.
Primary Air
Inlet Holes
Figure 28 - Injector Holder On Outlet
Burner Tube - Rear Burner
BURNER INJECTOR HOLDERS AND
PILOT AIR INLET HOLES
The primary air inlet holes allow the proper amount
of air to mix with the gas. This provides a clean
burning flame. Keep these holes clear of dust, dirt,
lint, and pet hair. Clean these air inlet holes prior to
each heating season. Blocked air holes will create
soot. We recommend that you clean the unit every
three months during operation and have heater
inspected yearly by a qualified service person.
Injector Holder
Ports/Slots
Primary Air Inlet Holes
Figure 29 - Injector Holder On Front
Outlet Burner Tube
We also recommend that you keep the burner
tubes and pilot assembly clean and free of dust
and dirt. To clean these parts we recommend using
compressed air no greater than 30 PSI. Your local
computer store, hardware store, or home center
may carry compressed air in a can. You can use a
vacuum cleaner in the blow position. If using com-
pressed air in a can, please follow the directions on
the can. If you don't follow directions on the can,
you could damage the pilot assembly.
Pilot
Bracket
Access
Hole for
Cleaning
Natural
Pilot
Pilot
Assembly
Access
Hole for
Cleaning
Propane/LP
Pilot
1. Shut off the unit, including the pilot. Allow
the unit to cool for at least thirty minutes.
Pilot Air Inlet Hole
Figure 30 - Cleaning Pilot Air Inlet Hole
(Your pilot may vary from pilots shown)
2. Inspect burners, pilot, and primary air inlet
holes on injector holder for dust and dirt (see
Figures 28 or 29).
LOGS
3. Blow air through the ports/slots and holes in
the burners.
•
If you remove logs for cleaning, refer to Install-
ing Logs, page 14, to properly replace logs.
4. Check the injector holders located at the end
of the burner tubes again. Remove any large
•
Replace log(s) if broken or chipped (dime-sized
or larger).
113183-01A
19
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TROUBLESHOOTING
WARNING: Turn off heater and let cool before servicing. Only a
qualified service person should service and repair heater.
CAUTION: Never use a wire, needle, or similar object to clean
ODS/pilot. This can damage ODS/pilot unit.
Note: All troubleshooting items are listed in order of operation.
OBSERVED PROBLEM POSSIBLE CAUSE
REMEDY
When ignitor button is pressed, 1. Ignitor electrode not con- 1. Reconnect ignitor cable
there is no spark at ODS/pilot
nected to ignitor cable
2. Ignitor cable pinched or wet
2. Free ignitor cable if pinched
by any metal or tubing. Keep
ignitor cable dry
3. Broken ignitor cable
4. Bad ignitor
3. Replace ignitor cable
4. Replace ignitor
5. Ignitor electrode positioned 5. Replace pilot assembly
wrong
6. Ignitor electrode broken
6. Replace pilot assembly
7. Battery not installed, battery 7. Install new alkaline battery
power low, or battery not
installed correctly
in electronic ignitor. Verify
battery is installed correctly
When ignitor button is pressed, 1. Gassupplyturnedofforequip- 1. Turn on gas supply or open
there is spark at ODS/pilot but
no ignition
ment shutoff valve closed
2. Control knob not in PILOT 2. Turn control knob to PILOT
position position
3. Control knob not pressed in 3. Press in control knob while in
while in PILOT position PILOT position
4. Air in gas lines when in- 4. Continue holding down con-
equipment shutoff valve
stalled
trol knob. Repeat igniting op-
eration until air is removed
5. Depleted gas supply (pro- 5. Contact local propane/LPgas
pane/LP only)
6. ODS/pilot is clogged
company
6. CleanODS/pilot(seeCleaning
and Maintenance, page 19) or
replace ODS/pilot assembly
7. Gas regulator setting is not 7. Replace gas regulator
correct
20
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113183-01A
TROUBLESHOOTING
Continued
OBSERVED PROBLEM POSSIBLE CAUSE
REMEDY
ODS/pilot lights but flame 1. Control knob not fully pressed in 1. Press in control knob fully
goes out when control knob is 2. Control knob not pressed in 2. After ODS/pilot lights, keep
released
long enough
control knob pressed in 30
seconds
3. Safety interlock system has 3. Wait one minute for safety
been triggered
interlock system to reset.
Repeat ignition operation
4. Equipment shutoff valve not 4. Fully open equipment shutoff
fully open valve
5. Pilot flame not touching 5. A) Contact local natural or
thermocouple, which allows
thermocouple to cool, caus-
ing pilot flame to go out. This
problem could be caused by
one or both of the following:
A) Low gas pressure
propane/LP gas company
B) Clean ODS/pilot (see
Cleaning and Maintenance,
page 19) or replace ODS/pilot
assembly
B) Dirty or partially clogged
ODS/pilot
6. Thermocouple connection 6. Hand tighten until snug, then
loose at control valve
7. Thermocouple damaged
8. Control valve damaged
tighten 1/4 turn more
7. Replace pilot assembly
8. Replace control valve
One or more burners do not light 1. Inlet gas pressure is too low
after ODS/pilot is lit
2. Burner orifice(s) clogged
1. Contact local natural or pro-
pane/LP gas company
2. Clean burner(s) (see Cleaning
and Maintenance, page 19) or
replace burner orifice(s)
3. Contact qualified service
person
3. Mislocated crossover tube
Delayed ignition of one or more 1. Manifold pressure is too low 1. Contact local natural or pro-
burners
pane/LP gas company
2. Clean burner(s) (see Cleaning
and Maintenance, page 19) or
replace burner orifice(s)
3. Contact qualified service
person
2. Burner orifice(s) clogged
3. Mislocated crossover tube
Burner backfiring during com- 1. Burner orifice is clogged or 1. Clean burner (see Cleaning
bustion
damaged
and Maintenance, page 19)
or replace burner orifice
2. Damaged burner
3. Gas regulator defective
2. Replace damaged burner
3. Replace gas regulator
Yellow flame in burner during 1. Not enough air
burner combustion
1. Check burner(s) for dirt
and debris. If found, clean
burner(s) (see Cleaning and
Maintenance, page 19)
2. Gas regulator defective
2. Replace gas regulator
113183-01A
21
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TROUBLESHOOTING
Continued
OBSERVED PROBLEM POSSIBLE CAUSE
REMEDY
Slightsmokeorodorduringinitial 1. Residues from manufacturing 1. Problem will stop after a few
operation processes and logs curing hours of operation
Heaterproducesawhistlingnoise 1. Turning control knob to HI 1. Turn control knob to LO
when burners are lit
position when burners are
cold
2. Air in gas line
position and let warm up for
a minute
2. Operate burners until air is
removed from line. Have gas
line checked by local natural
or propane/LP gas company
3. Air passageways on heater 3. Observe minimum installa-
blocked
tion clearances (see pages 8
through 10)
4. Dirty or partially clogged 4. Clean burners (see Cleaning
burner orifice(s) and Maintenance, page 19)
White powder residue forming 1. When heated, vapors from 1. Turn heater off when using
within burner box or on adjacent
walls or furniture
furniture polish, wax, carpet
cleaners, etc. may turn into
white powder residue
furniture polish, wax, carpet
cleaners, or similar products
Moisture/condensation noticed 1. Not enough combustion/ven- 1. Refer to Air for Combustion
on windows
tilation air
and Ventilation requirements
(page 5)
Heater produces a clicking/tick- 1. Metal expanding while heat- 1. This is common with most
ing noise just after burners are lit
or shut off
ing or contracting while
cooling
heaters. If noise is excessive,
contact qualified service
person
22
113183-01A
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TROUBLESHOOTING
Continued
WARNING: If you smell gas
• Shut off gas supply.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your
building.
• Immediately call your gas supplier from a neighbor’s phone. Fol-
low the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
IMPORTANT: Operating heater where impurities in air exist may create odors. Cleaning supplies, paint,
paint remover, cigarette smoke, cements and glues, new carpet or textiles, etc., create fumes. These
fumes may mix with combustion air and create odors. These odors will disappear over time.
OBSERVED PROBLEM POSSIBLE CAUSE
REMEDY
Heater produces unwanted 1. Heater burning vapors from 1. Open window to ventilate
odors
paint, hair spray, glues, clean-
ers, chemicals, new carpet,
etc. (See IMPORTANT state-
ment above)
room. Stop using odor caus-
ing products while heater is
running
2. Low fuel supply (propane/LP 2. Refill supply tank (propane/
only) LP only)
3. Gas leak. See Warning 3. Locate and correct all leaks
statement at top of page
(see Checking Gas Connec-
tions, page 13)
Heater shuts off in use (ODS 1. Not enough fresh air is avail- 1. Open window and/or door for
operates)
able
2. Low line pressure
ventilation
2. Contact local natural or pro-
pane/LP gas company
3. ODS/pilot is partially 3. CleanODS/pilot(seeCleaning
clogged and Maintenance, page 19)
Gasodorevenwhencontrolknob 1. Gas leak. See Warning 1. Locate and correct all leaks
is in OFF position
statement at top of page
(see Checking Gas Connec-
tions, page 13)
2. Replace control valve
2. Control valve defective
Gas odor during combustion
1. Foreign matter between con- 1. Take apart gas tubing and
trol valve and burner remove foreign matter
2. Gas leak. See See Warn- 2. Locate and correct all leaks
ing statement at top of
page
(see Checking Gas Connec-
tions, page 13)
Log set cycles to pilot, but room 1. Thermostat sensing bulb 1. Reposition thermostat sensing
temperaturedropstoalowerthan
ideal level before log set comes
back on
needs to be repositioned
bulb (see Optional Position-
ing of Thermostat Sensing
Bulb, page 24)
113183-01A
23
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OPTIONAL POSITIONING
OF THERMOSTAT
SENSING BULB
FOR MASONRY AND FACTORY-
BUILT METAL FIREPLACE
If your log set cycles to pilot, but the room tem-
perature drops to a lower than ideal comfort level
before the log set comes back on, you may want
to reposition the thermostat sensing bulb.
Figure 32 - Adhesive-backed Mounting Clip
Thermostat
Sensing Bulb
The thermostat sensing bulb is located on the left
side of the base assembly. This location allows the
thermostat to keep the room temperature at an ideal
comfort level for most fireplace applications. For
positioning the thermostat sensing bulb elsewhere,
an adhesive-backed mounting clip is available.
Adhesive-
backed
Mounting Clip
Figure 33 - Locating Thermostat Sensing
Bulb on Masonry Fireplace
1. Locate the gas valve assembly and thermostat
sensing bulb (see Figure 31).
2. Gently pull thermostat sensing bulb free from
the retaining clamp.
Thermostat
Sensing Bulb
IMPORTANT: Do not force or bend the
thermostat sensing bulb or capillary.
3. The thermostat sensing bulb may be located
to the lower right front side of fireplace. De-
termine location of sensing bulb, but do not
mount sensing bulb until step 4. If you have a
masonry fireplace, see Figure 33 for location.
Adhesive-backed
Mounting Clip
Figure 34 - Locating Thermostat Sensing
Bulb on Factory-built Metal Fireplace
If you have a factory-built metal fireplace, see
Figure 34 for location.
If your fireplace has glass doors, position
sensing bulb directly behind door gap on right
bottom side (see Figure 35).
Thermostat
Sensing
Bulb
4. The mounting clip must be a minimum of 3"
from bottom of fireplace to prevent crimping
of capillary. Once you have decided on a
location, clean the area thoroughly. Remove
the paper backing from the adhesive on back
of mounting clip. Press the clip into the new
location so that the thermostat sensing bulb
will be positioned vertically with the capil-
lary at the bottom (see Figure 36). Slide the
thermostat sensing bulb into the clip.
Adhesive-
backed
Mounting
Clip
Glass Door
Figure 35 - Installing Thermostat Sensing
Bulb Behind Glass Doors
IMPORTANT: Do not crimp capillary.
Thermostat
Sensing Bulb
Adhesive-backed
Mounting Clip
Capillary
Do Not Crimp
Capillary
Thermostat
Sensing Bulb
Retaining
Clamp
Gas Valve
Assembly
Figure 36 - Positioning the Thermostat
Sensing Bulb in the Vertical Position
with the Capillary at the Bottom
Figure 31 - Location of Gas Valve
Assembly and Thermostat Sensing Bulb
24
113183-01A
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SPECIFICATIONS
ACCESSORIES
CDR3924PT
CDR3924NT
NOTICE: All accessories may
not be available for all fireplace
models.
Btu (Variable)
Type Gas
Ignition
11,000/39,000 11,000/39,000
Propane/LP
Electronic
Natural
Electronic
3.6" W.C.
Manifold Pressure 8.0" W.C.
Inlet Gas Pressure (in. of water)
Purchase these heater accessories from your local
dealer. If they can not supply these accessories,
call DESA Heating Products at 1-866-672-6040
for referral information. You can also write to the
address listed on the back page of this manual.
Maximum
Minimum*
14"
10.5"
5"
11"
Shipping Weight
30 lbs.
30 lbs.
* For purpose of input adjustment
REPLACEMENT PARTS
Note: Use only original replacement parts. This
will protect your warranty coverage for parts
replaced under warranty.
EQUIPMENT SHUTOFF VALVE
GA5010
For all models. Equipment shutoff valve with
PARTS UNDER WARRANTY
Contact authorized dealers of this product. If
they canʼt supply original replacement part(s),
call DESA Heating Products' Technical Service
Department at 1-866-672-6040.
1/8" NPT tap. Fits 1/2" NPT pipe.
When calling DESA Heating Products, have ready
•
•
•
•
•
•
your name
your address
model and serial numbers of your heater
how heater was malfunctioning
type of gas used (propane/LP or natural gas)
purchase date
FIREPLACE HOOD
Black - GA6050
Brass - GA6052
Usually, we will ask you to return the part to the
factory.
Antique Brass - GA6053
For all models. Helps deflect heat away from
mantel or wall above fireplace. Fits openings 28"
to 48" wide.
PARTS NOT UNDER WARRANTY
Contact authorized dealers of this product. If they
canʼt supply original replacement part(s), call CLEANING KIT - CCK/GCK
DESA Heating Products at 1-866-672-6040 for
referral information.
(Not Shown)
For all models. Your vent-free gas appliance re-
quires regular cleaning and maintenance to prevent
performance problems. This kit gives you the tools
and instructions to make it easy to clean all critical
areas of your appliance.
When calling DESA Heating Products, have ready
•
•
model number of your heater
the replacement part number
SERVICE HINTS
When Gas Pressure Is Too Low
INFORMATION VIDEO - 108917-01
(Not Shown)
•
•
•
•
pilot will not stay lit
For all models. A care and maintenance video is
available by calling 1-866-672-6040.You may also
email your request to
burners will have delayed ignition
heater will not produce specified heat
propane/LP gas supply may be low
You may feel your gas pressure is too low. If
so, contact your local natural or propane/LP gas
supplier.
LAVA ROCK - GA6060 (Not Shown)
For all models. Order when additional rock is
desired. (3 lb. bag)
113183-01A
25
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ILLUSTRATED PARTS BREAKDOWN
MODELS CDR3924PT AND CDR3924NT
13
9
5
7
17
6
4
8
27
14
15
20
27
1
19
10
25
26
23
3
11
22
16
21
12
2
24
18
33
31
29
30
32
28
26
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113183-01A
PARTS LIST
This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 25 of this manual.
KEY
NO.
PART NUMBER
CDR3924NT CDR3924PT
DESCRIPTION
QTY.
1
Dual Ramp Base
Rear Burner Tube
Front Burner Tube
Retainer Spring
Front Burner
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
12
1
1
1
1
1
1
**
**
2
111331-16
113474-01
111124-01
113244-01
113167-01
108105-02
107110-01
107485-01
102394-02
099387-09
108628-01
114696-02
111435-01
098271-10
099056-18
101004-12
108111-01
108692-06
108692-05
113473-01
113474-01
111124-01
113244-01
113167-01
108105-02
107110-01
104286-01
102394-02
099387-09
108628-01
114696-02
111435-01
098271-10
099056-19
101004-09
108111-01
108692-06
108692-05
099123-01
3
4
5
6
Log Support Bracket
Rear Burner
7
8
Spacer
9
ODS Pilot
10
11
12
13
14
15
16
17
18
19
20
21
22
Control Bracket
Pilot Tube
Inlet Tube
Pilot Bracket
Electronic Ignitor
Ignitor Cable
Burner Orifice Injector, Rear
Burner Orifice Injector, Front
Cast Iron Grate
T-Stat Cover Plate
Ignitor Plate
099123-01
___
Thermobulb Clip
Gas Regulator (Propane/LP)
Gas Regulator (Natural)
Thermostatic Gas Valve Kit
Manual Control Valve
Control Knob
098867-18
___
098867-17
098522-25
108106-01
099393-03
098508-01
108631-01
114959-01
114959-02
114959-03
114959-04
114959-05
114959-06
23
24
25
26
27
28
29
30
31
32
33
098522-10
108106-01
099393-03
098508-01
108631-01
114959-01
114959-02
114959-03
114959-04
114959-05
114959-06
Valve Retainer Nut
Log Alignment Screw
Front Log
Left Side Log
Right Side Log
Rear Log
Middle Log
Crossover Log
PARTS AVAILABLE — NOT SHOWN
100563-01
101054-05
100639-03
GA6060
100563-01
101054-05
100639-03
GA6060
Warning Plate
1
1
1
1
1
Lighting Instructions Plate
Caution Decal
Lava Rock
101449-08
101449-08
Control Position Decal
** Not a field replaceable part.
113183-01A
27
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WARRANTY INFORMATION
KEEP THIS WARRANTY
Model
Serial No.
Date Purchased
Always specify model and serial numbers when communicating with the factory.
We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our
standard written warranty. We make no other warranty, expressed or implied.
LIMITED WARRANTY
COMFORT GLOW VENT-FREE GAS LOG HEATERS
DESA Heating Products warrants this product to be free from defects in materials and components for two (2)
year from the date of first purchase, provided that the product has been properly installed, operated and maintained
in accordance with all applicable instructions. To make a claim under this warranty the Bill of Sale or cancelled
check must be presented.
This warranty is extended only to the original retail purchaser. This warranty covers the cost of part(s) required
to restore this heater to proper operating condition and an allowance for labor when provided by a DESA Heating
ProductsAuthorized Service Center. Warranty part(s) MUST be obtained through authorized dealers of this product
and/or DESAHeating Products who will provide original factory replacement parts. Failure to use original factory
replacement parts voids this warranty. The heater MUST be installed by a qualified installer in accordance with
all local codes and instructions furnished with the unit.
This warranty does not apply to parts that are not in original condition because of normal wear and tear, or parts
that fail or become damaged as a result of misuse, accidents, lack of proper maintenance or defects caused by
improper installation. Travel, diagnostic cost, labor, transportation and any and all such other costs related to
repairing a defective heater will be the responsibility of the owner.
TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE SALE
OF THE PRODUCT; THIS EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EXPRESSED
WARRANTIESAND LIMITS THE DURATION OFANYANDALL IMPLIED WARRANTIES, INCLUDING
WARRANTIES OF MERCHANTABILITYAND FITNESS FORAPARTICULAR PURPOSETOTWO (2)YEAR
ON ALL COMPONENTS FROM THE DATE OF FIRST PURCHASE; AND DESA HEATING PRODUCTSʼ
LIABILITY IS HEREBY LIMITED TO THE PURCHASE PRICE OF THE PRODUCT AND DESA HEAT-
ING PRODUCTS SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING
INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow a limitation on how long an implied warranty lasts or an exclusion or limitation of
incidental or consequential damages, so the above limitation on implied warranties, or exclusion or limitation on
damages may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights that vary from state to state.
For information about this warranty write:
2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
113183-01
Rev. A
07/04
113183 01
NOT A UPC
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