Page 1
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 followed 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.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
— Installation and service must be performed by a quali-
fied installer, service agency or the gas supplier.
Save this manual for future reference.
For more information, visit www.desatech.com
Page 2
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause injury or property damage. Refer to this manual for correct installation
and operational procedures. For assistance or additional information consult a qualified installer, service
agency, or the gas supplier.
WARNING: This appliance is for installation only in a
solid-fuel burning masonry or UL127 factory-built fireplace, or in an listed ventless firebox enclosure. It is design-certified for these installations in accordance with
ANSI Z21.11.2. Exception: Do not install this appliance
in a factory-built fireplace that includes instructions
stating it has not been tested or should not be used
with unvented gas logs. For unmarked factory-built
fireplaces, contact fireplace manufacturer if unsure of
this application.
WARNING: This is an unvented gas-fired heater. It uses
air (oxygen) from the room in which it is installed. Provisions for adequate combustion and ventilation air must
be provided. Refer to Air for Combustion and Ventilation
section on page 5 of this manual.
This appliance may be installed in an aftermarket,* permanently located, manufactured (mobile) home, where
not prohibited by local codes.
This appliance is only for use with the type of gas indicated on the rating plate. This appliance is not convertible for use with other gases.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
Safety Information ............................................... 3
Local Codes ........................................................ 4
Product Identification ........................................... 5
Unpacking ........................................................... 5
Product Features ................................................. 5
Air For Combustion and Ventilation ..................... 5
Installation ........................................................... 8
Operating Heater ............................................... 16
Inspecting Burners ............................................ 18
Technical Service ..............................................
2
TABLE OF CONTENTS
Cleaning and Maintenance ................................ 19
Troubleshooting .................................................
Optional Positioning of Thermostat Sensing Bulb
Specifications .................................................... 25
Replacement Parts ............................................ 25
Service Hints ..................................................... 25
Accessories ....................................................... 25
Illustrated Parts Breakdown and Parts List ....... 26
Warranty Information ...........................Back Cover
18
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113183-01A
20
.. 24
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SAFETY INFORMATION
WARNING: This product
contains and/or generate s
chemicals known to the State
of California to cause cancer or
birth defects, or other reproductive harm.
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, operate, 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.
WARNING: This appliance
is for installation only in a
solid-fuel burning fireplace or
approved ventless firebox enclosure.
WARNING: Do not allow fans
to blow directly into the fireplace.
Avoid any drafts that alter burner
flame patterns. Ceiling fans can
create drafts that alter burner
flame patterns. Altered burner
patterns can cause sooting.
Due to high temperatures, the
appliance should be located out
of traffic and away from furniture
and draperies.
DANGER: Carbon monoxide
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.
Natural and Propane/LP Gas: Natural and pro-
pane/LP gases 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.
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.
WARNING: Any change to
this heater or its controls can
be dangerous.
WARNING: Do not use a
blower insert, heat exchanger
insert, or other accessory not ap
-
proved for use with this heater.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the heater.
Heater base assembly becomes
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. Allow surface to cool
before touching.
Carefully supervise young children when they are in the room
-
with heater.
You must operate this heater
with a fireplace screen in place.
Make sure fireplace screen is
closed before running heater.
Keep the appliance area clear
and free from combustible materials, gasoline, and other flammable vapors and liquids.
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3113183-01A
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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.
3. 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
neighborʼs phone. Follow the gas supplierʼs
instructions
• if you cannot reach your gas supplier, call
the fire department
4. This heater shall not be installed in a bedroom
or bathroom, unless installed as a vented ap
pliance.
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.
6. Do not burn solid-fuel in a masonry or UL127
factory-built fireplace in which a vent-free
room heater is installed.
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.
8. To prevent the creation of soot, follow the
instructions in Cleaning and Maintenance
page 19.
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.
10. This heater needs fresh, outside air ventilation to
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.
-
11. Do not run heater
• where flammable liquids or vapors are used
or stored
• under dusty conditions
12. Do not use this heater to cook food or burn
paper or any other type of solid fuels.
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
and to replace any part of the control system and
any gas control which has been under water.
14. Do not operate heater if any log is broken. Do
not operate heater if a log is chipped (dimesized or larger).
-
15. Turn heater off and let cool before servicing,
installing, or repairing.Only a qualified ser
vice person should install, service, or repair
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. Prov ide adeq ua te clearan ce s around air
openings.
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*
*Available from:
American National Standards Institute, Inc.
,
National Fire Protection Association, Inc.
Note: Where listed vented decorative logs are
required, thermostat operation is not permitted.
.
1430 Broadway
New York, NY 10018
Batterymarch Park
Quincy, MA 02269
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Page 5
PRODUCT
IDENTIFICATION
Ignitor
Log Set
SAFETY DEVICE
This heater has a pilot with an Oxygen Depletion 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.
IGNITION SYSTEM
This heater has an electronic ignitor to light heater
fuel supply.
AIR FOR COMBUSTION
AND VENTILATION
Burner
Control Knob
Grate
Figure 1 - Product Identification
Base
Assembly
UNPACKING
CAUTION: Do not remove the
data plates from the base assembly. The data plates contain
important warranty and safety
information.
1. Remove logs and heater base assembly from
carton. Note: Do not pick up heater base assembly by burners. This could damage heater.
Always handle base assembly by the sides of
assembly.
2. Remove all protective packaging applied to
logs and heater for shipment.
3. Check all items for any shipping damage. If
damaged, promptly inform dealer where you
bought heater.
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 ventfree operation with flue damper closed. It has been
tested and approved to ANSI Z21.11.2 standard for
unvented heaters. State and local codes in some
areas prohibit the use of vent-free heaters.
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WARNING: This heater shall
not be installed in a confined
space or unusually tight construction unless provisions are provided for adequate combustion and
ventilation air. Read the following
instructions to insure proper fresh
air for this and other fuel-burning
appliances in your home.
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.
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.
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.
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.
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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AIR FOR COMBUSTION
AND VENTILATION
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.
Unusually tight construction is defined as
construction where:
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
less with openings gasketed or sealed
and
b. weather stripping has been added on
openable windows and doors and
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.
If your home meets all of these three cri
teria, you must provide additional fresh
air. See Ventilation Air From Outdoors,
page 7.
If your home does not meet all of the three
criteria above, proceed to Determining
Fresh-Air Flow For Heater Location.
Confined and Unconfined Space
The National Fuel Gas Code, ANSI Z223.1/NFPA 54
defines a confined space as a space whose volume
is less than 50 cubic feet per 1,000 Btu per hour
3
(4.8 m
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
space in which the appliances are installed*, through
openings not furnished with doors, are considered
a part of the unconfined space.
* Adjoining rooms are communicating only if
there are doorless passageways or ventilation grills
between them.
6
-11
kg per pa-sec-m2) or
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DETERMINING FRESH-AIR FLOW
FOR HEATER LOCATION
Determining if You Have a Confined or
Unconfined Space
Use this work sheet to determine if you have a
confined or unconfined space.
Space: Includes the room in which you will install
heater plus any adjoining rooms with doorless passageways or ventilation grills between the rooms.
1. Determine the volume of the space (length x
width x height).
Length x Width x Height =__________cu. ft.
-
(volume of space)
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.
2. Multiply the space volume by 20 to determine
the maximum Btu/Hr the space can support.
__________ (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 ___________
Vented gas heater ___________
Gas fireplace logs ___________
Gas water heater __________
Other gas appliances* + __________
Total = __________
* Do not include direct-vent gas appliances. Di
rect-vent draws combustion air from the outdoors
and vents to the outdoors.
Example:
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.
_________
_________
Example: 51,200 Btu/Hr (maximum the space
79,000 Btu/Hr (actual amount of
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:
Btu/Hr (maximum the space can support)
Btu/Hr (actual amount of Btu/Hr used)
can support)
Btu/Hr used)
40,000
39,000
79,000
113183-01A
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
-
Btu/Hr
Btu/Hr
Btu/Hr
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Page 7
AIR FOR COMBUSTION
Outlet
Air
Ventilated
Attic
Outlet
A
ir
Inlet
Air
Inlet Air
Ventilated
Crawl Space
To
Crawl
Space
To Attic
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option
2
Ve
ntilation
Grills
Into Adjoining
Room,
Option 1
12"
12"
AND VENTILATION
Continued
A. Rework worksheet, adding the space of an adjoin-
ing room. If the extra space provides an unconfined
space, remove door to adjoining room or add
ventilation grills between rooms. See Ventilation
Air From Inside Building.
B. Vent room directly to the outdoors. See Ventila
tion Air From Outdoors, page 7.
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,
confined space. You will need no additional fresh
air ventilation.
WARNING: If the area in which
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
by one of the methods described
in the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 Section 5.3
or applicable local codes.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining
unconfined space, you must provide two permanent 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.
the space is an un-
-
Figure 2 - Ventilation Air from Inside
Building
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 thermostatcontrolled power vent. Heated air entering the attic
will activate the power vent.
Figure 3 - Ventila tion Air from Outdoors
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Page 8
INSTALLATION
NOTICE: This heater is intended
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
central heating system, you may
run system’s circulating blower
while using heater. This will help
circulate the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
WARNING: Installation and
repair should be done by a
qualified service person. The
appliance should be inspected
before use and at least annually by a professional service
person. More frequent cleaning
may be required due to excessive lint from carpeting, bedding
material, etc. It is imperative that
control compartments, burners
and circulating air passageways
of the appliance be kept clean.
WARNING: 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.
WARNING: Seal any fresh
air vents or ash clean-out doors
located on floor or wall of fireplace. If not, drafting may cause
pilot outage or sooting. Use a
heat-resistant sealant. Do not
seal chimney flue damper.
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing, or other flammable
objects are less than 42 inches
from the front, top, or sides of
the firebox opening
• in high traffic areas
• in windy or drafty areas
CAUTION: This heater creates 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 fluids, oil or kerosene lamps, etc.) in
the air exist, may discolor walls
or cause odors.
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
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.
-
Air
WARNING: This appliance
is equipped for (natural or propane/LP) gas. Field conversion
is not permitted.
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INSTALLATION
Continued
INSTALLATION AND CLEARANCES
FOR VENT-FREE OPERATION
WARNING: Maintain the
minimum clearances. If possible, provide greater clearances
from floor, ceiling, and adjoining
wall.
LOG SIZING REQUIREMENTS
Log Minimum Firebox
Size Height Depth Front Rear *
Width Width
24" 17" 14" 28" 20 1/4"
* Measured at 14" depth.
Carefully follow the instructions below. This will
ensure safe installation into a masonry, UL127listed 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.
Example: The face of a mantel, bookshelf,
etc. is made of combustible material and
protrudes 3 1/2" from the wall. This combustible material must be 4" from the side of the
fireplace cabinet (see Figure 4).
Note: When installing your gas logs into
a man uf actur ed fireb ox , foll ow fir ebox
manufacturerʼs instructions for minimum
clearances to combustible materials.
B. Clearances from the top of the fireplace open
ing to the ceiling should not be less than 42
inches.
Example
Minimum Noncombustible Material
Clearances
If Not Using Mantel
Note: If using a mantel proceed to If Using Mantel.
If not using a mantel, follow the information on
this page.
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.
If Using Mantel
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.
IMPORTANT: If you cannot meet these minimum
clearances, you must operate heater with chimney
flue damper open.
Noncombustible Requirements for
Material Distance (A)
12" or more Noncombustible material
okay.
Between 8" Install fireplace hood
and 12" accessory (GA6050,
GA6052, or GA6053 see
Accessories, page 34).
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Less than 8" Noncombustible material
must be extended to at
least 8". See Between 8"
and 12"
cannot extend material,
you must operate heater
Safe Installation
, above. If you
-
-
*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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9113183-01A
Page 10
INSTALLATION
Minimum
Noncombustible
Material
8"
Min.
12"
15"
18"
All minimum
distances are
in inches
20"
2
1
/2
"
6"
8"
10"
12"
Distances to
Underside of
Mantel
Hood
(GA6050,
GA6052 or
GA6053)
Top of
Fireplace
Opening
Underside
of Mantel
Shelf
Mantel Shelf
Minimum NonCombustible
Material
Minimum NonCombustible
Material Height
Distances to
Underside of
Mantel
Top of Fireplace
Opening
Underside of
Mantel Shelf
Mantel Shelf
12"
(A)
18"
20"
22"
24"
All minimum
distances are
in inches
Log Set
All Models
2
1
/2
"
6"
8"
10"
14"
Min.
Combustible
Material
Noncombustible Material
Hearth
5"
Min.
Combustible
Material
Continued
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.
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).
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.
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.
Figure 6 - Minimum Mantel Clearances
Without Using Hood
NOTICE: If your installation does
not meet the minimum clear
ances shown, you must do one
of the following:
• operate the logs only with the
flue damper open
• raise the mantel to an accept-
able height
• remove the mantel
FLOOR CLEARANCES
A. If installing appliance on the floor level, you
must maintain the minimum distance of 14"
to combustibles (see Figure 8).
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).
10
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Figure 7 - Minimum Mantel Clearances
When Using Hood
Figure 8 - Minimum Fireplace Clearances
If Installed at Floor Level
Figure 9 - Minimum Fireplace Clearances
Above Combustible Flooring
113183-01A
Page 11
INSTALLATION
Continued
INSTALLING HEATER BASE
ASSEMBLY
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.
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 insure adequate air flow and guard
against sooting and controls be
ing damaged. Raise fireplace floor
with noncombustible material.
Make sure material is secure.
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.
Installation Items Needed
• hardware package (provided with heater)
• approved flexible gas hose and fitting (not
provided) (if allowed by local codes)
• sealant (resistant to propane/LP gas, not pro
vided)
• electric drill with 3/16" drill bit (metal or ma
sonry as applicable)
• 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.
-
-
2. Locate two masonry screws in hardwa re
package.
3. Place heater base in fireplace.
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.
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,
mar k screw locatio ns in mortar joint of
bricks.
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)
Figure 10 - Attaching Flexible Gas Hose
Mounting
-
Flange
-
Figure 11 - Attaching Base Assembly to
Fitting
to Heater
Masonry
Screw
Fireplace Floor
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113183-01A
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11
Page 12
INSTALLATION
Continued
CONNECTING TO GAS SUPPLY
WARNING: This appliance
requires a 1/2" NPT (National
Pipe Thread) inlet connection to
the pressure regulator.
WARNING: A qualified service person must connect heater
to gas supply. Follow all local
codes.
CAUTION: For propane/LP
gas, never connect heater directly to the propane/LP supply.
This heater requires an external
regulator (not supplied). Install
the external regulator between the
heater and propane/LP supply.
Installation Items Needed
Before installing heater, make sure you have the
items listed below.
• 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
• tee joint
• pipe wrench
* A CSA design-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
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.
Accessories, page 25.
WARNING: For natu r a l
gas, never connect heater to
private (non-utility) gas wells.
This gas is commonly known
as wellhead gas.
CAUTION: Use only new,
black iron or steel pipe. Internally-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. If pipe is too small, undue
loss of volume will occur.
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.
Check building codes for any special require
-
ments for locating equipment shutoff valve to
fireplaces.
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.
Propane/LP
Supply Tank
Vent
-
Pointing
Down
Figure 12 - External Regulator With Vent
Pointing Down
External
Regulator
-
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113183-01A
Page 13
INSTALLATION
Continued
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. A sediment 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.
CAUTION: Avoid damage to
regulator. Hold gas regulator
with wrench when connecting it
to gas piping and/or fittings.
Propane/LP -
External Regulator
(11" W.C.** to 14" W.C.
Pressure)
Natural - From Gas
Meter
(5" W.C.** to
10.5" W.C.
Pressure)
Tee Cap Pipe
Joint Nipple
Sediment Trap
* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer. See
Accessories, page 25.
**Minimum inlet pressure for purpose of input
adjustment.
From
CSA DesignCertified Equipment
Shutoff Valve With
1/8" NPT Tap*
Approved Flexible
Gas Hose (if allowed
by local codes)
3"
Minimum
Gas
Regulator
Figure 13 - Gas Connection
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping and connections, internal
and external to unit, for leaks
after installing or servicing. Correct all leaks at once.
WARNING: Never use an
open flame to check for a leak.
Apply a noncorrosive leak detection fluid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
CAUTION: Make sure external regulator has been installed
between propane/LP supply
and heater. See guidelines under Connecting to Gas Supply,
page 12.
PRESSURE TESTING GAS SUPPLY
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.
2. Cap off open end of gas pipe where equipment
shutoff valve was connected.
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.
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.
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13113183-01A
Page 14
INSTALLATION
Continued
Test Pressures Equal To or Less Than
1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 14).
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.
3. Check all joints from gas meter for natural or
propane/LP supply 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.
PRESSURE TESTING HEATER GAS
CONNECTIONS
1. Open equipment shutoff valve (see Figure 14).
2. Open main gas valve located on or near gas
meter for natural gas or open propane/LP
supply tank valve.
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.
Equipment
Shutoff
Valve
Figure 14 - Equipment Shutoff Valve
Equipment Shutoff Valve
Propane/LP
Supply Tank
Open
Closed
Thermostat Gas
Valve or Control
Valve Location
6. Light heater (see Operating Heater, page 16).
Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to Appli
ance, page 17).
Thermostat Gas Valve or
Equipment
Shutoff Valve
Gas Meter
-
Figure 16 - Checking Gas Joints (Natural
Control Valve Location
Gas Only)
INSTALLING LOGS
WARNING: Failure to position the parts in accordance with
these diagrams or failure to use
only parts specifically approved
with this heater may result in
property damage or personal
injury.
CAUTION: After installation
and periodically thereafter, check
to ensure that no yellow flame
comes in contact with any log.
With the heater set to HI, check to
see if flames contact any log. If so,
reposition logs according to the
log installation instructions in this
manual. Yellow flames contacting
logs will create soot.
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
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113183-01A
Page 15
INSTALLATION
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.
2. Place front log (#2) onto base. Position log
onto two alignment screws to the front of base
(see Figure 18).
Place left side log (#3) onto two log alignment
3.
screws on left side of base (see Figure 18).
Place right side log (#4) onto two log alignment
4.
screws on right side of base (see Figure 18).
5. Place rear log (#5) onto two alignment screws
to the rear of base (see
6. Place crossover log (#6) onto log alignment
pin on middle log (#1) and rear log (#5) (see
Figure 19).
Left Log
Front
Log
Middle
Log
Figure 17 - Log Alignment Screws
Left Log #3
Figures 17 and
Front Log
19).
Rear Log
Log Support
Bracket
Right
Log
Middle
Log #1
Crossover
Log #6
Rear
Log #5
Figure 19 - Installing Rear Log #5 and
Crossover Log #6
ATTACHING GRATE TO BASE
ASSEMBLY
Locate the two slots in the front of the base assembly. Carefully slide the decorative grate into
these slots (see Figure 20).
Front
Log #2
Right
Log #4
Figure 18 - Installing Middle Log #1, Front
Log #2, Left Log #3 and Right Log #4
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Grate
Slots in Base
Figure 20 - Attaching Grate to Base
Assembly
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.
15113183-01A
Page 16
OPERATING HEATER
FOR YOUR SAFETY READ
BEFORE LIGHTING
WARNING: If you do not follow 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.
• Immediately call your gas supplier from
a neig h bor ʼs phon e. Fo llo w 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.
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.
-
LIGHTING
INSTRUCTIONS
WARNING:
• If fireplace has glass doors,
never operate this heater with
glass doors closed. If you oper
ate heater with doors closed,
heat buildup inside fireplace
will cause glass to burst. Also
if fireplace opening has vents at
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 running heater.
NOTICE: During initial operation
of new heater, burning logs will
give off a paper-burning smell.
Orange flame will also be present. Open damper or window to
vent smell. This will only last a
few hours.
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.
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.
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.
-
to the
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113183-01A
Page 17
OPERATING HEATER
Continued
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 supply. 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.
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.
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.
7. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob.
• If control knob does not pop out when
released, contact a qualified service person
or gas supplier for repairs.
Note: If pilot goes out, repeat steps 3
through 7. This heater has a safety interlock
system. Wait one (1) minute for system to
reset before lighting pilot again.
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
terclockwise
CAUTION: Do not try to adjust heating levels by using the
equipment shutoff valve.
Ignitor Button
Figure 21 - Control Knob(s) and Ignitor
Button Locations
to the ON position.
Control Knob
Rear Burner
Control Knob
Pilot Burner
Thermocouple
Figure 22 - Pilot
(Propane/LP)
Ignitor
Electrode
Pilot Burner
Thermocouple
Figure 23 - Pilot
(Natural)
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. Turn control knob clockwise
OFF position.
2. Turn rear burner control knob clockwise
Shutting Off Burners Only (pilot stays lit)
1. Turn control knob clockwise
2. Turn rear burner control knob clockwise
to the OFF position.
PILOT position.
to the OFF position.
THERMOSTAT CONTROL
OPERATION
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.
-
Note: Selecting the HI setting with the control
knob will cause the burner to remain fully on,
without modulating down in most cases.
MANUAL LIGHTING
PROCEDURE
1. Follow steps 1 through 5 under Lighting
Instructions, starting on page 16.
2. Depress control knob and light pilot with
match.
3. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob. Now follow steps 8 and 9
Lighting Instructions, column 1.
under
to the
to the
-
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17113183-01A
Page 18
INSPECTING BURNERS
Check pilot flame pattern and burner flame patterns 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.
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
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.
Pilot Burner
, pages 20
Thermocouple
Pilot Burner
WARNING: If yellow tipping
occurs, your heater could produce increased levels of carbon
monoxide. If burner flame patterns show yellow tipping, follow
instructions below. Yellow flame
on rear burner is normal.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles are burned
-
by heater, causing brief patches
of orange flame.
If burner flame patterns are incorrect, as shown
in Figure 27
• turn heater off (see To Turn Off Gas to Appli
ance, page 17)
• see Troubleshooting
, page 20
-
(Natural Gas)
Figure 24 - Correct Pilot Flame Pattern
(Your pilot may vary from pilots shown)
Pilot Burner
(Natural Gas)
Figure 25 - Incorrect Pilot Flame Pattern
(Your pilot may vary from pilots shown)
Thermocouple
(Propane/LP Gas)
Pilot Burner
(Propane/LP Gas)
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.
18
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Figure 26 - Correct Burner Flame
Patterns
Yellow Tipping At
Top of Blue Flame
Figure 27 - Incorrect Burner Flame
Patterns
TECHNICAL SERVICE
You may have further questions about installation,
operation, or troubleshooting. If so, contact DESA
Heating Productsʼ Technical Service Department at
1-866-672-6040. When calling, please have your
model and serial numbers of your heater ready.
You can also visit DESA Heating Productsʼ techni
cal services web site at www.desatech.com.
113183-01A
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Page 19
CLEANING AND
MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep control areas, burners, and circulating
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
excessive lint from carpeting, pet
hair, bedding material, etc.
WARNING: Failure to keep
the primary air opening(s) of
the burner(s) clean may result in
sooting and property damage.
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.
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.
1. Shut off the unit, including the pilot. Allow
the unit to cool for at least thirty minutes.
2. Inspect burners, pilot, and primary air inlet
holes on injector holder for dust and dirt (see
Figures 28 or 29).
3. Blow air through the ports/slots and holes in
the burners.
4. Check the injector holders located at the end
of the burner tubes again. Remove any large
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particles of dust, dirt, lint, or pet hair with a
soft cloth or vacuum cleaner nozzle.
5. Blow air into the primary air holes on the
injector holders.
6. In case any large clumps of dust have now been
pushed into the burner repeat steps 3 and 4.
Clean the pilot assembly also. A yellow tip on the pilot
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
blow air through the air inlet hole. The access hole for
propane/LP pilot is on the front of the burner carriange
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.
Burner
Tube
Primary Air
Inlet Holes
Figure 28 - Injector Holder On Outlet
Burner Tube - Rear Burner
Ports/Slots
Primary Air Inlet Holes
Figure 29 - Injector Holder On Front
Pilot
Bracket
Pilot
Assembly
-
Access
Hole for
Cleaning
Propane/LP
Pilot
Figure 30 - Cleaning Pilot Air Inlet Hole
(Your pilot may vary from pilots shown)
Outlet Burner Tube
Pilot Air Inlet Hole
Injector Holder
Injector Holder
LOGS
• If you remove logs for cleaning, refer to Install-
ing Logs, page 14, to properly replace logs.
• Replace log(s) if broken or chipped (dime-sized
or larger).
Access
Hole for
Cleaning
Natural
Pilot
19113183-01A
Page 20
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
When ignitor button is pressed,
there is no spark at ODS/pilot
POSSIBLE CAUSE
1. Ig nitor electrode not connected to ignitor cable
2. Ignitor cable pinched or wet
3. Broken ignitor cable
4. Bad ignitor
5. Ignitor electrode positioned
wrong
6. Ignitor electrode broken
7. Battery not installed, battery
pow er low, or battery not
installed correctly
REMEDY
1. Reconnect ignitor cable
2. Free ignitor cable if pinched
by any metal or tubing. Keep
ignitor cable dry
3. Replace ignitor cable
4. Replace ignitor
5. Replace pilot assembly
6. Replace pilot assembly
7. Install new alkaline battery
in electronic ignitor. Verify
battery is installed correctly
When ignitor button is pressed,
there is spark at ODS/pilot but
no ignition
1. Gas supply turned off or equip
ment shutoff valve closed
2. Control knob not in PILOT
position
3. Control knob not pressed in
while in PILOT position
4. Ai r in g as line s when in
stalled
5. Deple ted gas supply (pro
pane/LP only)
6. ODS/pilot is clogged
7. Gas regulator setting is not
correct
1. Turn on gas supply or open
equipment shutoff valve
2. Turn control knob to PILOT
position
3. Press in control knob while in
PILOT position
-
4. Continue holding down con
trol knob. Repeat igniting op
eration until air is removed
-
5. Contact local propane/LP gas
company
6. Clean ODS/pilot (see Cleaning
and Maintenance, page 19) or
replace ODS/pilot assembly
7. Replace gas regulator
-
-
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113183-01A
Page 21
OBSERVED PROBLEM
ODS/ pilot l ights but flame
goes out when control knob is
released
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1.
Control knob not fully pressed in
2. Control knob not pressed in
long enough
3. Safety interlock system has
been triggered
4. Equipment shutoff valve not
fully open
5. Pil o t fla me not touc h ing
thermocouple, which allows
thermocouple to cool, causing pilot flame to go out. This
problem could be caused by
one or both of the following:
A) Low gas pressure
B) Dirty or partially clogged
ODS/pilot
6. Th er mo couple connection
loose at control valve
7. Thermocouple damaged
8. Control valve damaged
REMEDY
1. Press in control knob fully
2. After ODS/pilot lights, keep
control knob pressed in 30
seconds
3. Wait one minute for safety
interloc k system to reset.
Repeat ignition operation
4. Fully open equipment shutoff
valve
5. A) Contact local natural or
propane/LP gas company
B) Cle an OD S/p i lot (see
Cleaning and Maintenance,
page 19) or replace ODS/pilot
assembly
6. Hand tighten until snug, then
tighten 1/4 turn more
7. Replace pilot assembly
8. Replace control valve
One or more burners do not light
after ODS/pilot is lit
Delayed ignition of one or more
burners
Burner backfiring during com
bustion
Yellow flame in burner during
burner combustion
1. Inlet gas pressure is too low
2. Burner orifice(s) clogged
3. Mislocated crossover tube
1. Manifold pressure is too low
2. Burner orifice(s) clogged
3. Mislocated crossover tube
-
1. Burner orifice is clogged or
damaged
2. Damaged burner
3. Gas regulator defective
1. Not enough air
2. Gas regulator defective
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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. Conta ct qual ifi ed servic e
person
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. Conta ct qual ifi ed servic e
person
1. Clean burner (see Cleaning
and Maintenance, page 19)
or replace burner orifice
2. Replace damaged burner
3. Replace gas regulator
1. Chec k bu r ner( s ) fo r di rt
and debris. If found, clean
burner(s) (see Cleaning and
Maintenance, page 19)
2. Replace gas regulator
21113183-01A
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-
Page 22
OBSERVED PROBLEM
Slight smoke or odor during initial
operation
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1. Residues from manufacturing
processes and logs curing
REMEDY
1. Problem will stop after a few
hours of operation
Heater produces a whistling noise
when burners are lit
White powder residue forming
within burner box or on adjacent
walls or furniture
Moisture/condensation noticed
on windows
Heater produces a clicking/tick
ing noise just after burners are lit
or shut off
1. Turning control knob to HI
position when burners are
cold
2. Air in gas line
3. Air passageways on heater
blocked
4. Di rty or partially clogged
burner orifice(s)
1. When heated, vapors from
furniture polish, wax, carpet
cleaners, etc. may turn into
white powder residue
1. Not enough combustion/ven
tilation air
-
1. Metal expanding while heat
in g or cont r acti n g whil e
cooling
1. Turn con tro l knob to LO
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. Observe minimum installation clearances (see pages 8
through 10)
4. Clean burners (see
and Maintenance, page 19)
1. Turn heater off when using
furniture polish, wax, carpet
cleaners, or similar products
-
1. Refer to Air for
and Ventilation requirements
(page 5)
1. This is common with most
heaters. If noise is excessive,
co nta c t qua l ifi ed ser vic e
person
Combustion
Cleaning
22
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113183-01A
Page 23
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. Follow 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
He ater pro d uce s unw ante d
odors
Heater shuts off in use (ODS
operates)
Gas odor even when control knob
is in OFF position
Gas odor during combustion
POSSIBLE CAUSE
1. Heater burning vapors from
paint, hair spray, glues, clean
ers, chemicals, new carpet,
etc. (See IMPORTANT state
ment above)
2. Low fuel supply (propane/LP
only)
3. Gas leak. See Warni ng
statement at top of page
1. Not enough fresh air is avail
able
2. Low line pressure
3. O D S/ pi l ot is p a rt ia l ly
clogged
1. Gas leak. See Warni ng
statement at top of page
2. Control valve defective
1. Foreign matter between con
trol valve and burner
2. Gas leak. See See Warn-
ing statement at top of
page
REMEDY
1. Open w indow to ventilate
-
room. Stop using odor caus
ing products while heater is
-
running
2. Refill supply tank (propane/
LP only)
3. Locate and correct all leaks
(see Checking Gas Connec
tions, page 13)
1. Open window and/or door for
ventilation
2. Contact local natural or pro
pane/LP gas company
3. Clean ODS/pilot (see Cleaning
and Maintenance, page 19)
1. Locate and correct all leaks
(see Checking Gas Connec
tions, page 13)
2. Replace control valve
1. Take apart gas tubing and
remove foreign matter
2. Locate and correct all leaks
(see Checking Gas Connec
tions, page 13)
-
-
-
-
-
Log set cycles to pilot, but room
temperature drops to a lower than
ideal level before log set comes
back on
1. T herm osta t sens i ng bu l b
needs to be repositioned
www.desatech.com
1. Reposition thermostat sensing
bulb (see Optional Position
ing of Thermostat Sensing
Bulb, page 24)
23113183-01A
-
Page 24
OPTIONAL POSITIONING
OF THERMOSTAT
SENSING BULB
FOR MASONRY AND FACTORYBUILT METAL FIREPLACE
If your log set cycles to pilot, but the room temperature drops to a lower than ideal comfort level
before the log set comes back on, you may want
to reposition the 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.
1. Locate the gas valve assembly and thermostat
sensing bulb (see Figure 31).
2. Gently pull thermostat sensing bulb free from
the retaining clamp.
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.
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).
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.
IMPORTANT: Do not crimp capillary.
Figure 32 - Adhesive-backed Mounting Clip
Thermostat
Sensing Bulb
Adhesivebacked
Mounting Clip
Figure 33 - Locating Thermostat Sensing
Bulb on Masonry Fireplace
Thermostat
Sensing Bulb
-
Adhesive-backed
Mounting Clip
Figure 34 - Locating Thermostat Sensing
Bulb on Factory-built Metal Fireplace
Thermostat
Sensing
Bulb
Adhesivebacked
Mounting
Clip
-
Glass Door
Figure 35 - Installing Thermostat Sensing
Bulb Behind Glass Doors
Thermostat
Sensing Bulb
Adhesive-backed
Mounting Clip
Thermostat
Sensing Bulb
Figure 31 - Location of Gas Valve
Assembly and Thermostat Sensing Bulb
24
Retaining
Clamp
Gas Valve
Assembly
www.desatech.com
Capillary
Do Not Crimp
Capillary
Figure 36 - Positioning the Thermostat
Sensing Bulb in the Vertical Position
with the Capillary at the Bottom
113183-01A
Page 25
SPECIFICATIONS
CDR3924PT CDR3924NT
Btu (Variable) 11,000/39,000 11,000/39,000
Type Gas Propane/LP Natural
Ignition Electronic Electronic
Manifold Pressure 8.0" W.C. 3.6" W.C.
Inlet Gas Pressure (in. of water)
Maximum 14" 10.5"
Minimum* 11" 5"
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.
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.
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
Usually, we will ask you to return the part to the
factory.
PARTS NOT UNDER WARRANTY
Contact authorized dealers of this product. If they
canʼt supply original replacement part(s), call
DESA Heating Products at 1-866-672-6040 for
referral information.
When calling DESA Heating Products, have ready
• model number of your heater
• the replacement part number
SERVICE HINTS
When Gas Pressure Is Too Low
• pilot will not stay lit
• 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.
ACCESSORIES
NOTICE: All accessories may
not be available for all fireplace
models.
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.
EQUIPMENT SHUTOFF VALVE
GA5010
For all models. Equipment shutoff valve with
1/8" NPT tap. Fits 1/2" NPT pipe.
FIREPLACE HOOD
Black - GA6050
Brass - GA6052
Antique Brass - GA6053
For all models. Helps deflect heat away from
mantel or wall above fireplace. Fits openings 28"
to 48" wide.
CLEANING KIT - CCK/GCK
(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.
INFORMATION VIDEO - 108917-01
(Not Shown)
For all models. A care and maintenance video is
available by calling 1-866-672-6040. You may also
email your request to
productsupport@desaint.com.
LAVA ROCK - GA6060 (Not Shown)
For all models. Order when additional rock is
desired. (3 lb. bag)
-
www.desatech.com
25113183-01A
Page 26
ILLUSTRATED PARTS BREAKDOWN
4
7
6
27
27
8
26
10
23
19
20
29
28
32
31
33
30
14
15
9
13
5
25
21
1
16
17
2
12
24
3
11
22
18
MODELS CDR3924PT AND CDR3924NT
26
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113183-01A
Page 27
This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
PARTS LIST
listed under Replacement Parts on page 25 of this manual.
KEY PART NUMBER
NO. CDR3924NT CDR3924PT DESCRIPTION QTY.
1 ** ** Dual Ramp Base 1
2 111331-16 113473-01 Rear Burner Tube 1
3 113474-01 113474-01 Front Burner Tube 1
4 111124-01 111124-01 Retainer Spring 1
5 113244-01 113244-01 Front Burner 1
6 113167-01 113167-01 Log Support Bracket 1
7 108105-02 108105-02 Rear Burner 1
8 107110-01 107110-01 Spacer 2
9 107485-01 104286-01 ODS Pilot 1
10 102394-02 102394-02 Control Bracket 1
11 099387-09 099387-09 Pilot Tube 1
12 108628-01 108628-01 Inlet Tube 1
13 114696-02 114696-02 Pilot Bracket 1
14 111435-01 111435-01 Electronic Ignitor 1
15 098271-10 098271-10 Ignitor Cable 1
16 099056-18 099056-19 Burner Orifice Injector, Rear 1
17 101004-12 101004-09 Burner Orifice Injector, Front 1
18 108111-01 108111-01 Cast Iron Grate 1
19 108692-06 108692-06 T-Stat Cover Plate 1
20 108692-05 108692-05 Ignitor Plate 1
21 099123-01 099123-01 Thermobulb Clip 2
___
22
098867-17
23 098522-25 098522-10 Thermostatic Gas Valve Kit 1
24 108106-01 108106-01 Manual Control Valve 1
25 099393-03 099393-03 Control Knob 1
26 098508-01 098508-01 Valve Retainer Nut 1
27 108631-01 108631-01 Log Alignment Screw 12
28 114959-01 114959-01 Front Log 1
29 114959-02 114959-02 Left Side Log 1
30 114959-03 114959-03 Right Side Log 1
31 114959-04 114959-04 Rear Log 1
32 114959-05 114959-05 Middle Log 1
33 114959-06 114959-06 Crossover Log 1
100563-01 100563-01 Warning Plate 1
101054-05 101054-05 Lighting Instructions Plate 1
100639-03 100639-03 Caution Decal 1
GA6060 GA6060 Lava Rock 1
101449-08 101449-08 Control Position Decal 1
** Not a field replaceable part.
098867-18 Gas Regulator (Propane/LP) 1
___
Gas Regulator (Natural) 1
PARTS AVAILABLE — NOT SHOWN
www.desatech.com
27113183-01A
Page 28
113183 01
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
Products Authorized Service Center. Warranty part(s) MUST be obtained through authorized dealers of this product
and/or DESA Heating 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
WARRANTIES AND LIMITS THE DURATION OF ANY AND ALL IMPLIED WARRANTIES, INCLUDING
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE TO TWO (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
www.desatech.com
NOT A UPC
113183-01
Rev. A
07/04
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