Desa CDR3924NT Quick start guide

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WARNING: If the information in this manual is not fol-
lowed exactly, a re or explosion may result causing
property damage, personal injury or loss of life.
— Do not store or use gasoline or other ammable
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 re
department.
— Installation and service must be performed by a quali-
ed installer, service agency or the gas supplier.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
UNVENTED (VENT-FREE) GAS LOG HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
24" THERMOSTAT MODELS CDR3924NT AND CDR3924PT

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SAFETy INFORMATION
TAbLE OF CONTENTS
Safety Information ............................................... 2
Local Codes......................................................... 4
Product Identication........................................... 5
Unpacking............................................................ 5
Product Features................................................. 5
Air For Combustion and Ventilation..................... 5
Installation ........................................................... 8
Operating Heater............................................... 16
Inspecting Burners............................................. 18
Technical Service............................................... 18
Cleaning and Maintenance................................ 19
Troubleshooting................................................. 20
Optional Positioning of Thermostat Sensing Bulb....24
Specications .................................................... 25
Replacement Parts............................................ 25
Service Hints ..................................................... 25
Accessories ....................................................... 25
Illustrated Parts Breakdown and Parts List........ 26
Warranty Information ...........................Back Cover
WARNING: Improper in-
stallation, adjustment, al-
teration, service or mainte-
nance can cause injury or
property damage. Refer to
this manual for correct in-
stallation and operational
procedures. For assis-
tance or additional infor-
mation consult a qualied
installer, service agency or
the gas supplier.
WARNING: This appliance
is for installation only in a
solid-fuel burning masonry
or UL127 factory-built re-
place or in an listed vent-
less rebox enclosure. It is
design-certied for these
installations in accordance
with ANSI Z21.11.2. Excep-
tion: Do not install this
appliance in a factory-built
replace that includes in-
structions stating it has not
been tested or should not
be used with unvented gas
logs. For unmarked facto-
ry-built replaces, contact
replace manufacturer if
unsure of this application.
WARNING: This is an
unvented gas-red heat-
er. 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 Ven-
tilation section on page 5
of this manual.
This appliance may be in-
stalled in an aftermarket,*
permanently located,
manufactured (mobile)
home, where not prohib-
ited 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

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WARNING: This product
contains and/or generates
chemicals known to the State
of California to cause cancer or
birth defects or other reproduc-
tive harm.
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, oper-
ate or service this heater. Improp-
er use of this heater can cause
property damage and serious
injury or death from burns, re,
explosion, electrical shock and
carbon monoxide poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of carbon
monoxide poisoning resemble the u, with head-
aches, 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 inuence
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.
SAFETy INFORMATION
Continued WARNING: This appliance
is for installation only in a
solid-fuel burning replace or
approved ventless rebox en-
closure.
WARNING: Do not allow fans
to blow directly into the replace.
Avoid any drafts that alter burner
ame patterns. Ceiling fans can
create drafts that alter burner
ame patterns. Altered burner
patterns can cause sooting.
Due to high temperatures, the
appliance should be located out
of trafc and away from furniture
and draperies.
Do not place clothing or other
ammable 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 chil-
dren when they are in the room
with heater.
You must operate this heater
with a replace screen in place.
Make sure replace screen is
closed before running heater.
Keep the appliance area clear
and free from combustible ma-
terials, gasoline and other am-
mable vapors and liquids.

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1. 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.
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
neighbor’s phone. Follow the gas supplier’s
instructions
• if you cannot reach your gas supplier, call
the re department
4. This heater shall not be installed in a bedroom or
bathroom, unless installed as a vented appliance.
5. Before installing in a solid fuel burning re-
place, the chimney ue and rebox must be
cleaned of soot, creosote, ashes and loose paint
by a qualied chimney cleaner. Creosote will
ignite if highly heated. A dirty chimney ue
may create and distribute soot within the house.
Inspect chimney ue and rebox for damage. If
damaged, repair ue before operating heater.
6. Do not burn solid-fuel in a masonry or UL127
factory-built replace in which a vent-free
room heater is installed.
7. If replace has glass doors, never operate this
heater with glass doors closed. If you operate
heater with doors closed, heat buildup inside
replace will cause glass to burst. Make sure there
are no obstructions across openings of replace.
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.
SAFETy INFORMATION
Continued
11. Do not run heater
• where ammable 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 qualied
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 (dime-
sized or larger).
15. Turn heater off and let cool before servicing,
installing or repairing. Only a qualied 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. Provide adequate clearances 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.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
Note: Where listed vented decorative logs are
required, thermostat operation is not permitted.
State of Massachusetts: The installa-
tion must be made by a licensed plumber
or gas fitter in the Commonwealth of
Massachusetts.
Sellers of unvented propane or natural
gas-red supplemental room heaters shall
provide to each purchaser a copy of 527
CMR 30 upon sale of the unit.
Vent-free gas products are prohibited for
bedroom and bathroom installation in the
Commonwealth of Massachusetts.

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PRODUCT
IDENTIFICATION
Log Set
Base
Assembly
Ignitor
Burner
Control Knob
Figure 1 - Product Identication
Grate
UNPACkING
CAUTION: Do not remove
the data plates from the base as-
sembly. 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 as-
sembly 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 ames
and glowing coals. This heater is designed for vent-
free operation with ue 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.
SAFETY DEVICE
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.
IGNITION SYSTEM
This heater has an electronic ignitor to light heater
fuel supply.
AIR FOR COMbUSTION
AND VENTILATION
WARNING: This heater shall
not be installed in a conned
space or unusually tight construc-
tion unless provisions are provid-
ed 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.
Today’s homes are built more energy efcient
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 ef-
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, replaces, 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 classications:
1. Unusually Tight Construction
2. Unconned Space
3. Conned Space
The information on pages 5 through 7 will help
you classify your space and provide adequate
ventilation.

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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 dened 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 10-11 kg per pa-sec-m2) or
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 oors, 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.
Conned and Unconned Space
The National Fuel Gas Code, ANSI Z223.1/NFPA 54
denes a conned 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 unconned
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 unconned space.
* Adjoining rooms are communicating only if
there are doorless passageways or ventilation grills
between them.
DETERMINING FRESH-AIR FLOW
FOR HEATER LOCATION
Determining if You Have a Conned or
Unconned Space
Use this work sheet to determine if you have a
conned or unconned 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).
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 ___________ Btu/Hr
Gas water heater* ___________ Btu/Hr
Gas furnace ___________ Btu/Hr
Vented gas heater ___________ Btu/Hr
Gas replace logs ___________ Btu/Hr
Gas water heater __________ Btu/Hr
Other gas appliances* +__________ Btu/Hr
Total = _________ Btu/Hr
* 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 __________ Btu/Hr
Vent-free heater +__________ Btu/Hr
Total =__________ Btu/Hr
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)
79,000 Btu/Hr (actual amount of
Btu/Hr used)
The space in the above example is a conned 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:
AIR FOR COMbUSTION
AND VENTILATION
Continued
40,000
39,000
79,000

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A. Rework worksheet, adding the space of an adjoin-
ing room. If the extra space provides an unconned
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 unconned.
If the actual Btu/Hr used is less than the maximum
Btu/Hr the space can support, the space is an un-
conned space. You will need no additional fresh
air ventilation.
WARNING: Ifthe area inwhich
the heater may be operated is
smaller than that dened as
an unconned 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/NFPA54 Section 5.3
or applicable local codes.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining un-
conned space. When ventilating to an adjoining
unconned space, you must provide two perma-
nent openings: one within 12" of the ceiling and
one within 12" of the oor 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.
AIR FOR COMbUSTION
AND VENTILATION
Continued
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 oor. 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.
Figure 3 - Ventilation Air from Outdoors
Figure 2 - Ventilation Air from Inside
Building
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
Ventilation
Grills Into
Adjoining
Room,
Option 1
12"
12"

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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
qualied 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-
sive 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 replace,
the chimney ue and rebox
must be cleaned of soot, creo-
sote, ashes and loose paint by a
qualied chimney cleaner. Creo-
sote will ignite if highly heated. A
dirty chimney ue may create and
distribute soot within the house.
Inspect chimney ue and rebox
for damage. If damaged, repair
ue before operating heater.
WARNING: Seal any fresh
air vents or ash clean-out doors
located on oor or wall of re-
place. If not, drafting may cause
pilot outage or sooting. Use a
heat-resistant sealant. Do not
seal chimney ue damper.
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing or other ammable
objects are less than 42" from
the front, top or sides of the
rebox opening
• in high trafc areas
• in windy or drafty areas
CAUTION:Thisheatercreates
warm air currents. These currents
move heat to wall surfaces next
to heater. Installing heater next
to vinyl or cloth wall coverings or
operating heater where impurities
(such as, but not limited to, to-
bacco smoke, aromatic candles,
cleaning uids, 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 benecial, 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 replace. Call dealer where you bought
replace for proper type replace.
WARNING: This appliance
is equipped for natural or pro-
pane/LP gas. Field conversion
is not permitted.

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INSTALLATION AND CLEARANCES
FOR VENT-FREE OPERATION
WARNING: Maintain the
minimum clearances. If possible,
provide greater clearances from
oor, ceiling and adjoining wall.
LOG SIZING REQUIREMENTS
Log Minimum Firebox
Size Height Depth Front Rear *
Width Width
24" 17" 14" 28" 20 1/4"
Minimum Firebox with Blower
24" 17" 14" 34" 22 3/8"
* Measured at 14" depth.
Carefully follow the instructions below. This will
ensure safe installation into a masonry, UL127-listed
manufactured replace or listed vent-free rebox.
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 combus-
tible material must be 4" from the side of the
replace cabinet (see Figure 4).
Note: When installing your gas logs into
a manufactured firebox, follow firebox
manufacturer’s instructions for minimum
clearances to combustible materials.
B. Clearances from the top of the replace opening
to the ceiling should not be less than 42".
INSTALLATION
Continued
Figure 4 - Minimum Clearance for
Combustible to Wall
*Minimum 16" from Side Wall
*
Example
Figure 5 - Heat Resistant Material (Slate,
Marble, Tile, etc.) Above Fireplace
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
replace opening. Noncombustible materials (such
as slate, marble, tile, etc.) must be at least 1/2" thick.
With sheet metal, you must have noncombustible
material behind it. Noncombustible material must
extend at least 8" up. If noncombustible material is
less than 12", you must install the replace hood ac-
cessory. See Figure 5 for minimum clearances.
If Using Mantel
You must have noncombustible material(s) above
the replace opening. Noncombustible materials
(such as slate, marble, tile, etc.) must be at least
1/2" thick. With sheet metal, you must have non-
combustible material behind it. Noncombustible
material must extend at least 8" up. If noncombus-
tible material is less than 12", you must install the
replace hood accessory. Even if noncombustible
material is more than 12", you may need the hood
accessory to deect 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
ue damper open.
Noncombustible Requirements for
Material Distance (A) Safe Installation
12" or more Noncombustible material
okay.
Between 8" Install replace hood
and 12" accessory (GA6050,
GA6052 or GA6053 see
Accessories, page 25).
Less than 8" Noncombustible material
must be extended to at
least 8". See Between 8"
and 12", above. If you
cannot extend material,
you must operate heater
with ue damper open.

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INSTALLATION
Continued
Minimum
Noncombustible
Material
8"
Min.
12" 15" 18" 20"
2½"
6"
8"
10"
12"
Distances to
Underside of
Mantel
Hood
(GA6050,
GA6052 or
GA6053)
Top of
Fireplace
Opening
Underside
of Mantel
Shelf
Mantel Shelf
MANTEL CLEARANCES
In addition to meeting noncombustible material
clearances, you must also meet required clearances
between replace 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 replace 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.
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
ue damper open
• raise the mantel to an accept-
able height
• remove the mantel
FLOOR CLEARANCES
A. If installing appliance on the oor level, you
must maintain the minimum distance of 14"
to combustibles (see Figure 8).
B. If combustible materials are less than 14" to
the replace, you must install appliance at
least 5" above the combustible ooring (see
Figure 9).
Figure 6 - Minimum Mantel Clearances
Without Using Hood
Figure 8 - Minimum Fireplace Clearances
If Installed at Floor Level
Figure 9 - Minimum Fireplace Clearances
Above Combustible Flooring
Figure 7 - Minimum Mantel Clearances
When Using Hood
Minimum Non-
Combustible
Material
Minimum Non-
Combustible
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

www.desatech.com 11113183-01F
INSTALLATION
Continued
INSTALLING HEATER BASE
ASSEMBLY
WARNING: You must secure
this heater to replace oor. If
not, heater will move when you
adjust controls. Moving heater
may cause a gas leak.
WARNING: If installing in a
sunken replace, special care
is needed. You must raise the
replace oor to allow access to
heater control panel. This will in-
sure adequate air ow and guard
against sooting and controls be-
ing damaged. Raise replace oor
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 oor. 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)
• athead screwdriver
1. Connect tting to base as shown in Figure 10.
Connect approved exible gas hose to tting
in base (see Figure 10).
IMPORTANT: Hold gas tting with wrench
when connecting exible gas hose.
Figure 10 - Attaching Flexible Gas Hose
to Heater
Fitting
Flexible Gas
Hose (if allowed
by local codes)
Figure 11 - Attaching Base Assembly to
Fireplace Floor
Masonry
Screw
Mounting
Flange
2. Locate two masonry screws in hardware
package.
3. Place heater base in replace.
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 replace.
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 replace,
mark screw locations in mortar joint of
bricks.
8. Remove heater base from replace. 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 replace oor using
two masonry screws (in hardware package).

www.desatech.com 113183-01F12
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 qualied ser-
vice person must connect heater
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
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-certied equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. Purchase the optional CSA
design-certied equipment shutoff valve from your
dealer. See Accessories, page 25.
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" 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.
WARNING: For natural
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. 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. 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
replaces.
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 External
Regulator
Figure 12 - External Regulator With Vent
Pointing Down
Vent
Pointing
Down

www.desatech.com 13113183-01F
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 ttings.
Figure 13 - Gas Connection
Tee Cap Pipe
Joint Nipple
3"
Minimum
Gas
Regulator
Propane/LP - From
External Regulator
(11" W.C.** to 14" W.C.
Pressure)
Natural - From Gas
Meter
(5" W.C.** to
10.5" W.C.
Pressure)
CSA Design-
Certied Equipment
Shutoff Valve With
1/8" NPT Tap*
Approved Flexible
Gas Hose (if allowed
by local codes)
Sediment Trap
* Purchase the optional CSA design-certied
equipment shutoff valve from your dealer. See
Accessories, page 25.
**Minimum inlet pressure for purpose of input
adjustment.
CHECKING GAS CONNECTIONS
WARNING: Test all gas pip-
ing and connections, internal
and external to unit, for leaks
after installing or servicing. Cor-
rect all leaks at once.
WARNING: Never use an
open ame to check for a leak.
Apply a noncorrosive leak detec-
tion uid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
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.
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 uid 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 ttings for
leaks.

www.desatech.com 113183-01F14
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 uid 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 uid to
all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
Figure 14 - Equipment Shutoff Valve
Figure 15 - Checking Gas Joints
(Propane/LP Gas Only)
Thermostat Gas
Valve or Control
Valve Location
Propane/LP
Supply Tank
Equipment Shutoff Valve
Open
Closed
Equipment
Shutoff
Valve
Figure 16 - Checking Gas Joints (Natural
Gas Only)
Thermostat Gas Valve or
Control Valve Location
Gas Meter
Equipment
Shutoff Valve
INSTALLING LOGS
WARNING: Failure to posi-
tion the parts in accordance with
these diagrams or failure to use
only parts specically approved
with this heater may result in
property damage or personal
injury.
CAUTION: After installation
and periodically thereafter, check
to ensure that no yellow ame
comes in contact with any log.
With the heater set to HI, check to
see if ames contact any log. If so,
reposition logs according to the
log installation instructions in this
manual. Yellow ames 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.
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).

www.desatech.com 15113183-01F
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.
INSTALLATION
Continued
Figure 18 - Installing Middle Log #1, Front
Log #2, Left Log #3 and Right Log #4
Figure 19 - Installing Rear Log #5 and
Crossover Log #6
Left Log #3
Right
Log #4
Front
Log #2
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).
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 20 - Attaching Grate to Base
Assembly
Grate
Slots in Base
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).
Figure 17 - Log Alignment Screws
Front Log
Left Log
Right
Log
Rear Log
Middle
Log
Log Support
Bracket
Front
Log
Rear
Log #5
Middle
Log #1
Crossover
Log #6

www.desatech.com 113183-01F16
OPERATING HEATER
FOR YOUR SAFETY READ
BEFORE LIGHTING
WARNING: If you do not fol-
low these instructions exactly,
a re 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 oor because some gas is heavier than
air and will settle on the oor.
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 neighbor’s phone. Follow the gas
supplier’s instructions.
• If you cannot reach your gas supplier, call
the re 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, don’t
try to repair it, call a qualied service tech-
nician or gas supplier. Force or attempted
repair may result in a re or explosion.
D. Do not use this appliance if any part has
been under water. Immediately call a
qualied 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 replace has glass doors,
never operate this heater with
glass doors closed. If you oper-
ate heater with doors closed,
heat buildup inside replace
will cause glass to burst. Also
if replace 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 run-
ning heater.
NOTICE: During initial operation
of new heater, burning logs will
give off a paper-burning smell.
Orange ame will also be pres-
ent. 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 ames of the HI heat setting but will
nd 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 to the
OFF position.
4. Wait ve (5) minutes to clear out any gas.
Then smell for gas, including near the oor.
If you smell gas, STOP! Follow “B” in the
safety information, column 1. If you don’t
smell gas, go to the next step.

www.desatech.com 17
113183-01F
OPERATING HEATER
Continued
Figure 21 - Control Knob(s) and Ignitor
Button Locations
Ignitor Button Control Knob Rear Burner
Control Knob
Figure 22 - Pilot
(Propane/LP)
Pilot Burner
Thermocouple
Figure 23 - Pilot
(Natural)
Ignitor
Electrode
Pilot Burner
Thermocouple
5. Turn control knob counterclockwise
to the PILOT position. Press in control
knob for ve (5) seconds (see Figure 21).
Note: You may be running this heater for
the rst 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.
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
qualied 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 qualied 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 ame burner, push
in and turn rear burner control knob coun-
terclockwise to the ON position.
CAUTION: Do not try to adjust
heating level of rear burner. Rear
burner control knob should be in ON
or OFF positions only. Do not oper-
ate with rear burner control knob
between ON or OFF positions.
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. Turn control knob clockwise to the
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
PILOT position.
2. Turn rear burner control knob clockwise
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 ame 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
under Lighting Instructions, column 1.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.

www.desatech.com 113183-01F18
Pilot Burner
Pilot Burner
Pilot Burner Thermocouple
INSPECTING bURNERS
Check pilot ame pattern and burner ame pat-
terns often.
PILOT FLAME PATTERN
Figure 24 shows a correct pilot ame pattern.
Figure 25 shows an incorrect pilot ame 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 ame 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 ame on natural gas units will
have a slight curve, but the ame should be blue
and have no yellow or orange color.
Figure 26 - Correct Burner Flame
Patterns
Figure 27 - Incorrect Burner Flame
Patterns
Figure 24 - Correct Pilot Flame Pattern
(Your pilot may vary from pilots shown)
Figure 25 - Incorrect Pilot Flame Pattern
(Your pilot may vary from pilots shown)
Yellow Tipping At
Top of Blue Flame
(Natural Gas)
(Propane/LP Gas)
(Propane/LP Gas)
(Natural Gas)
Pilot Burner Thermocouple
BURNER FLAME PATTERNS
Figure 26 shows correct burner ame patterns.
Figure 27 shows incorrect burner ame patterns.
The incorrect burner ame patterns show yellow
tipping at top of blue ame.
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide. If burner ame pat-
terns show yellow tipping, follow
instructions below. Yellow ame
on rear burner is normal.
NOTICE: Do not mistake orange
ames with yellow tipping. Dirt
or other ne particles are burned
by heater, causing brief patches
of orange ame.
If burner ame 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
TECHNICAL SERVICE
You may have further questions about installation,
operation or troubleshooting. If so, contact DESA
Heating Products’ 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 Products’ techni-
cal services web site at www.desatech.com.

www.desatech.com 19113183-01F
Access
Hole for
Cleaning
Natural
Pilot
CLEANING AND
MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep con-
trol areas, burners and circulating
air passageways of heater clean.
Inspect these areas of heater
before each use. Have heater
inspected yearly by a qualied
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 ame. 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 qualied 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
Figure 28 - Injector Holder On Outlet
Burner Tube - Rear Burner
Figure 30 - Cleaning Pilot Air Inlet Hole
(Your pilot may vary from pilots shown)
Figure 29 - Injector Holder On Front
Outlet Burner Tube
Injector Holder
Primary Air Inlet Holes
Pilot Air Inlet Hole
Pilot
Assembly
Ports/Slots
Access
Hole for
Cleaning
Propane/LP
Pilot
Pilot
Bracket
Burner
Tube
Injector Holder
Primary Air
Inlet Holes
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).
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 ame indicates dust and dirt in the pilot as-
sembly. There is a small pilot air inlet hole about 2"
from where the pilot ame 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 carriage
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.

www.desatech.com 113183-01F20
TROUbLESHOOTING
WARNING: Turn off heater and let cool before servicing. Only a
qualied 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.
POSSIBLE CAUSE
1. Ignitor electrode not con-
nected 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
power low or battery not
installed correctly
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. Air in gas lines when in-
stalled
5. Depleted gas supply (pro-
pane/LP only)
6. ODS/pilot is clogged
7. Gas regulator setting is not
correct
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
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
OBSERVED PROBLEM
When ignitor button is pressed,
there is no spark at ODS/pilot
When ignitor button is pressed,
there is spark at ODS/pilot but
no ignition