Desa CFS18NRA Quick start guide

UNVENTED (VENT-FREE)
NATURAL GAS LOG HEATER
ALSO DESIGN-CERTIFIED AS A VENTED DECORATIVE APPLIANCE
OWNER’S OPERATION AND INSTALLATION MANUAL
Save this manual for future reference
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.
• Immediatelycallyourgassupplierfrom
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 per-
formed by a qualified installer, service
agency, or the gas supplier.
WARNING:Improperinstallation,adjust-
ment,alteration,service,ormaintenance
can cause injury or property damage.
Refertothismanualforcorrectinstalla-
tion and operational procedures. For
assistance or additional information
consult a qualified installer, service
agency, or the gas supplier.
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.Referto Airfor Combustion and Ventilation sectiononpage 4 of this manual.
®
P
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F
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LO
REMOTE
OFF
ON
HI
CFS18NRA
VS18NRA
VS24NRA
VS30NRA
"A" Model
18", 24", and 30"
Remote-Ready
DESA INTERNATIONAL
This appliance may be installed in an aftermarket* manufactured (mobile) home, where not prohibited by
state or local codes.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
WARNING: This appliance is for in-
stallation only in a solid-fuel burning
masonry or UL127 factory-built fire-
place, or in an approved ventless fire-
box. It is design-certified for these in-
stallations in accordance with ANS
Z21.11.2.Exception:Donotinstallthis
appliance in a factory-built fireplace
thatincludesinstructionsstatingithas
not been tested or should not be used
with unvented gas logs.

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104416
UNVENTED NATURAL GAS LOG HEATER
DESA INTERNATIONAL
1. This appliance is only for use with the
typeof gasindicated ontherating plate.
Thisappliance isnot convertible foruse
with other gases.
2. 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
SAFETY
INFORMATION
DANGER: Carbon monoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early
signs of carbon monoxide poisoning re-
semble the flu, with headaches, dizziness,
ornausea.Ifyouhavethesesigns,theheater
maynotbe working properly.Getfreshair
atonce!Haveheaterserviced.Somepeople
are more affected by carbon monoxide than
others. These include pregnant women,
peoplewithheartorlungdiseaseoranemia,
those under the influence of alcohol, and
those at high altitudes.
Natural Gas: Natural gas is odorless. An
odor-making agent is added to the gas. The
odor helps you detect a gas leak. However,
theodor addedto thegas canfade. Gasmay
be present even though no odor exists.
Make certain you read and understand all
Warnings. Keep this manual for reference.
It is your guide to safe and proper operation
of this heater.
WARNINGS
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, oper-
ate, or service this heater. Im-
properuseofthisheatercancause
seriousinjuryordeathfromburns,
fire, explosion, electrical shock,
and carbon monoxide poisoning.
WARNING: Any change to
this heater or its controls can be
dangerous.
• ifyou cannotreach yourgas supplier,
call the fire department
3. This heater shall not be installed in a
bedroom or bathroom unless installed
as a vented appliance (see Installing
Damper Clamp Accessory for Vented
Operation, page 10).
4. Never install the heater
• in a recreational vehicle
• wherecurtains, furniture,clothing, or
otherflammable objectsare lessthan
42inches fromthe front,top, orsides
of the heater
• in high traffic areas
• in windy or drafty areas
5. Before installing in a solid fuel burn-
ingfireplace, thechimney flueand fire-
box must be cleaned of soot, creosote,
ashes and loose paint by a qualified
chimney cleaner. Creosote will ignite
if highly heated. Inspect chimney flue
for damage. If damaged, operate heater
with flue damper closed.
6. If fireplace has glass doors, never op-
eratethis heaterwithglass doorsclosed.
Ifyou operateheater withdoors closed,
heat buildup inside fireplace will cause
glass to burst. Also if fireplace open-
ing has vents at the bottom, you must
open the vents before operating heater.
7. You must operate this heater with a fire-
placescreeninplace.Makesurefireplace
screen is closed before running heater.
8. This logheateris designedtobe smoke-
less. If logs ever appear to smoke, turn
off heater and call a qualified service
person. Note: During initial operation,
slight smoking may occur due to log
curing and heater burning manufactur-
ing residues.
9. To prevent the creation of soot, follow
the instructions in Cleaning and Main-
tenance, page 18.
10. Do not allow fans to blow directly into
the fireplace. Avoid any drafts that al-
ter burner flame patterns. Ceiling fans
maycreate draftsthat alter burnerflame
patterns. Altered burner patterns can
cause sooting.
11. Before usingfurniture polish,wax, car-
pet cleaner, or similar products, turn
heater off. If heated, the vapors from
theseproducts maycreate awhite pow-
der residue within burner box or on
adjacent walls or furniture.
12. Do not use a blower insert, heat ex-
changer insert or other accessory not
approved for use with this heater.
13. This heaterneeds fresh,outside air ven-
tilation to run properly.This heater has
an oxygen depletion sensor (ODS) pi-
lot light safety system. The ODS shuts
down the heater if not enough fresh air
is available. See Air for Combustion
and Ventilation, pages 4 through 6. If
heater keeps shutting off, see Trouble-
shooting, pages 19 through 21.
14. Do not run heater
• where flammable liquids or vapors
are used or stored
• under dusty conditions
15. Do not use this heater to cook food or
burn paper or other objects.
16. Never place any objects on the heater.
17. Heater baseassembly becomesveryhot
whenrunning heater.Keepchildren 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.
18. Carefully supervise young children
when they are in the room with heater.
When using the hand-held remote ac-
cessory, keep selector switch in the
OFF position to prevent children from
turning on burners with hand-held re-
mote control unit.
19. Do not use heater if any part has been
exposedto orunder water.Immediately
call a qualified service technician to in-
spectthe roomheaterand toreplaceany
part of the control system and any gas
control which has been under water.
20. Do not operate heater if any log is bro-
ken. Do not operate heater if a log is
chipped (dime-sized or larger).
21. Turn heater off and let cool before ser-
vicing, installing, or repairing. When us-
ingthehand-heldremoteaccessory,make
sure the selector switch is in the OFF
position. Only a qualified service person
should install, service, or repair heater.
22. Whenusingthehand-held remote acces-
sory, make sure the selector switch is in
the OFF position when you are away
from home for long periods of time.
23. This heater must not be connected to
any external electrical source.
24. Operating heater above elevations of
4,500 feet may cause pilot outage.

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104416
OWNER’S MANUAL
AUTO
MAN
OFF
STATUS
ONLO
HI
TEMP
PRODUCT
IDENTIFICATION
Figure 1 - VS24NR Shown
LOCAL CODES
Install and use heater with care. Follow all
localcodes.Intheabsenceoflocalcodes,use
the latest edition of The National Fuel Gas
CodeANSZ223.1,alsoknownasNFPA54*.
*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.
UNPACKING
PRODUCT
FEATURES
OPERATION
This heater is clean burning. It requires no
outside venting. There is no heat loss out a
vent or up a chimney. Heat is generated by
both realistic flames and glowing coals.
This heater is designed for vent-free opera-
tion with flue damper closed. It has been
tested and approved to ANS Z21.11.2 stan-
dard for unvented heaters. State and local
codesinsomeareasprohibittheuseofvent-
free heaters. This heater may also be oper-
ated as a vented decorative (ANS Z21.60)
product by opening the flue damper (non-
thermostat operation only).
SAFETY PILOT
This heater has a pilot with an Oxygen
Detection Safety Pilot System (ODS). The
ODS/pilotisarequiredfeatureforvent-free
room heaters. The ODS/pilot shuts off the
heater if there is not enough fresh air.
PIEZO IGNITION SYSTEM
This heater has a piezo ignitor. This system
requires no matches, batteries, or other
sources to light heater.
Control Knob
Rear Log
Base
Assembly
Front
Burner
Piezo
Ignitor
Rear
Burner
Crossover Log
Middle
Log
Front Log
Selector
Switch
(Optional)
Flame
Adjustment
Knob
Remote
Control
(Optional)
OPTIONAL
REMOTE CONTROL
ACCESSORIES
Thereare fouroptionalremote controls that
can be purchased separately for this log
heater:
• wall switch
• wall thermostat
• hand-held ON/OFF remote
• hand-held thermostat remote.
See Accessories, page 25.
The wall thermostat or hand-held thermo-
stat may not be used where vented decora-
tive listing is required.
CAUTION:Do notremovethe
metal data plates attached to the
heater base assembly. The data
platescontainimportantwarranty
information.
1. Remove logs and heater base assem-
bly from carton. Note: Do not pick up
heater base assembly by burners. This
could damage heater. Always handle
base assembly by grate.
2. Remove all protective packaging ap-
plied to logs and heater for shipment.
3. Check all items for any shipping dam-
age. If damaged, promptly inform
dealer where you bought heater.

4
104416
UNVENTED NATURAL GAS LOG HEATER
DESA INTERNATIONAL
Today’s homes are built more energy effi-
cient than ever. New materials, increased
insulation, and new construction methods
helpreduceheatlossinhomes.Homeowners
weatherstripand caulk aroundwindows and
doorstokeepthecoldairoutandthewarmair
in. During heating months, home owners
want their homes as airtight as possible.
While it is good to make your home energy
efficient,yourhomeneedstobreathe.Fresh
air must enter your home. All fuel-burning
appliances need fresh air for proper com-
bustion and ventilation.
Exhaustfans,fireplaces,clothesdryers,and
fuel burning appliances draw air from the
house to operate. You must provide ad-
equate fresh air for these appliances. This
will insure proper venting of vented fuel-
burning appliances.
AIR FOR
COMBUSTION AND
VENTILATION
WARNING: This heater shall
notbeinstalledinaconfinedspace
or unusually tight construction
unless provisions are provided
foradequatecombustionandven-
tilation air. Read the following in-
structions to insure proper fresh
air for this and other fuel-burning
appliances in your home.
PROVIDING ADEQUATE
VENTILATION
The following are excerpts from National
Fuel Gas Code. NFPA 54/ANS Z223.1, Sec-
tion5.3,AirforCombustionandVentilation.
Allspacesinhomesfallintooneofthethree
following ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 4 through 6 will
help you classify your space and provide
adequate ventilation.
Unusually Tight Construction
The air that leaks around doors and win-
dows 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-
fined as construction where:
a. walls and ceilings exposed to the
outside atmosphere have a con-
tinuous water vapor retarder with
a rating of one perm (6x10-11 kg
per pa-sec-m2) or less with open-
ings 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, be-
tween sole plates and floors,be-
tween wall-ceiling joints, be-
tween wall panels, at penetra-
tionsforplumbing,electrical,and
gas lines, and at other openings.
If your home meets all of the three
criteria above, you must provide ad-
ditional fresh air. See Ventilation Air
From Outdoors , page 6.
If your home does not meet all of the
three criteria above, proceed to De-
termining Fresh-Air Flow for Heater
Location , page 5.
Confined and Unconfined Space
The National Fuel Gas Code (ANS Z223.1,
1992 Section 5.3) defines a confined space
as a space whose volume is less than 50
cubicfeetper1,000Btuperhour(4.8m3per
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
per hour (4.8 m3per kw) of the aggregate
inputratingofallappliancesinstalledinthat
space.Roomscommunicating directlywith
the space in which the appliances are in-
stalled*, through openings not furnished
with doors, are considered a part of the
unconfined space.
This heater shall not be installed in a con-
fined space or unusually tight construction
unlessprovisions areprovidedfor adequate
combustion and ventilation air.
*Adjoiningroomsarecommunicatingonly
iftherearedoorlesspassagewaysorventila-
tion grills between them.

5
104416
OWNER’S MANUAL
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:Includestheroominwhichyouwillinstallheaterplusanyadjoiningroomswithdoorlesspassagewaysorventilationgrillsbetween
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. Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space can support.
_____________________ (volume of space) ÷ 50 cu. ft. = (Maximum Btu/Hr the space can support)
Example: 2560 cu. ft. (volume of space) ÷ 50 cu. ft. = 51.2 or 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 fireplace logs ______________ Btu/Hr
Other gas appliances* + ______________ Btu/Hr
Total = ______________ Btu/Hr
* Do not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and vents to the outdoors.
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)
73,000 Btu/Hr (actual amount of Btu/Hr used)
ThespaceintheaboveexampleisaconfinedspacebecausetheactualBtu/HrusedismorethanthemaximumBtu/Hrthespacecansupport.
You must provide additional fresh air. Your options are as follows:
A. Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoin-
ing room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 6.
B. Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 6.
C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconfined.
If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an unconfined space. You will need no
additional fresh air ventilation.
AIR FOR
COMBUSTION AND
VENTILATION
Continued
Example:
Gas water heater 40,000 Btu/Hr
Vent-free heater + 33,000 Btu/Hr
Total = 73,000 Btu/Hr
WARNING:Iftheareainwhichtheheatermaybeoperatedissmallerthanthatdefinedasanunconfinedspace
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, ANS Z223.1, 1992, Section 5.3 or applicable local codes .
Continued

6
104416
UNVENTED NATURAL GAS LOG HEATER
DESA INTERNATIONAL
AIR FOR
COMBUSTION AND
VENTILATION
Continued
VENTILATION AIR
Ventilation Air From Inside
Building
Thisfreshairwouldcomefromanadjoining
unconfined space. When ventilating to an
adjoining unconfined space, you must pro-
vide two permanent openings: one within
12" of the ceiling and one within 12" of the
floor on the wall connecting the two spaces
(seeoptions1and2,Figure2).Youcanalso
remove door into adjoining room (see op-
tion 3, Figure 2). Follow the National Fuel
Gas Code NFPA 54/ANS Z223.1, Section
5.3, Air for Combustion and Ventilation for
required size of ventilation grills or ducts.
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 per-
manent openings: one within 12" of the
ceiling and one within 12" of the floor.
Connecttheseitemsdirectlytotheoutdoors
orspacesopentotheoutdoors.Thesespaces
include attics and crawl spaces. Follow the
National Fuel Gas Code NFPA 54/ANS
Z223.1,Section5.3,AirforCombustionand
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-controlledpowervent.Heatedair
enteringtheatticwillactivatethepowervent.
Figure 3 - Ventilation Air from Outdoors
WARNING: Rework work-
sheet, adding the space of the
adjoiningunconfinedspace.The
combined spaces must have
enough fresh air to supply all
appliances in both spaces.
Outlet
Air Ventilated
Attic
Outlet
Air
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"

7
104416
OWNER’S MANUAL
LOG SIZING REQUIREMENTS
Minimum Firebox Size
Log Front Rear*
Size Height Depth Width Width
18" 17" 14" 20" 14"
24" 17" 14" 26" 18"
30" 17" 14" 32" 22"
MINIMUM FIREPLACE CLEARANCE
TO COMBUSTIBLE MATERIALS
Log Size Side Wall Ceiling Floor*
18" 24" 30" 16" 42" 5"
*See Floor Clearances , page 9.
WARNING: A qualified ser-
vice person must install heater.
Follow all local codes.
WARNING: Before installing
in a solid fuel burning fireplace,
the chimney flue and firebox
must be cleaned of soot, creo-
sote, ashes and loose paint by a
qualifiedchimneycleaner.Creo-
sote will ignite if highly heated.
A dirty chimney flue may create
and distribute soot within the
house. Inspect chimney flue for
damage. If damaged, operate
heater with flue damper closed.
WARNING: Seal any fresh air
vents or ash clean-out doors lo-
catedonfloororwalloffireplace.
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 un-
less installed as a vented ap-
pliance, see page 10.
• in a recreational vehicle
• where curtains, furniture,
clothing, or other flammable
objectsarelessthan42inches
from the front, top, or sides of
the heater
• in high traffic areas
• in windy or drafty areas
CAUTION: This heater cre-
ates warm air currents. These
currents move heat to wall sur-
faces next to heater. Installing
heater next to vinyl or cloth wall
coverings or operating heater
where impurities (such as to-
bacco smoke, aromatic candles,
cleaning fluids, oil or kerosene
lamps, etc.) in the air exist, may
discolor walls.
IMPORTANT: Vent-freeheatersaddmois-
ture to the air. Although this is beneficial,
installing heater in rooms without enough
ventilation air may cause mildew to form
from too much moisture. See Air for Com-
bustion and Ventilation, pages 4 through 6.
INSTALLATION
WARNING: Make sure the
selector switch is in the OFF po-
sition before installing heater.
CHECK GAS TYPE
Use only natural gas. If your gas supply is
not natural gas, do not install heater. Call
dealer where you bought heater for proper
type heater.
INSTALLATION AND
CLEARANCES
(Vent-Free Operation Only)
WARNING:Maintainthemini-
mum clearances. If you can, pro-
vide greater clearances from
floor, ceiling, and adjoining wall.
Carefullyfollowtheinstructionsbelow.This
will ensure safe installation into a masonry,
UL127-listed manufactured fireplace, or
listed vent-free firebox.
Minimum Wall and Ceiling
Clearances (see Figure 4)
A. Clearances from the side of the fire-
place opening to any combustible wall
should not be less than 16 inches.
B. Clearancesfrom thetop ofthe fireplace
openingto theceiling should notbe less
than 42 inches.
Figure4-MinimumClearancetoWalland
Ceiling
Continued
NOTICE: This heater is intended
foruseassupplementalheat.Use
this heater along with your pri-
mary heating system. Do not in-
stall this heater as your primary
heatsource.If youhave acentral
heating system, you may run
system’scirculatingblowerwhile
usingheater.Thiswillhelpcircu-
late the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
NOTICE:Stateorlocalcodesmay
onlyallowoperationofthisappli-
ance in a vented configuration.
Check your state or local codes.
*Measured at 14" depth
42"
16"
Left and
Right Sides

8
104416
UNVENTED NATURAL GAS LOG HEATER
DESA INTERNATIONAL
Heat Resistant
Material (A)
Figure 5 - Heat Resistant Material (Slate, Marble, Tile, etc.) Above Fireplace
Noncombustible
Material Distance (A) Requirements for Safe Installation
12" or more Noncombustible material OK.
Between 8" and 12" Install fireplace hood 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.
INSTALLATION
Continued
If Using Mantel
You must have noncombustible material(s)
above the fireplace opening. Noncombus-
tible materials (such as slate, marble, tile,
etc.) must be at least 1/2 inch thick. With
sheetmetal,youmusthave noncombustible
material behind it. Noncombustible mate-
rial must extend at least 8 inches up. If
noncombustible material is less than 12",
you must install the fireplace hood acces-
sory (24" and 30" models only). Even if
noncombustible material is more than 12",
you may need the hood accessory to deflect
heat away from your mantel shelf. See Fig-
ure 5, and Figures 6 and 7, page 9, for
minimum clearances.
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 below.
You must have noncombustible material(s)
abovethefireplaceopening.Noncombustible
materials(suchasslate,marble,tile,etc.)must
beatleast1/2inchthick.Withsheetmetal,you
musthavenoncombustiblematerialbehindit.
If noncombustible material is less than 12",
you must install the fireplace hood accessory
(24" and 30" models only). See Figure 5 for
minimum clearances.
IMPORTANT: If you cannot meet these
minimum clearances, you must operate
heater with chimney flue damper open. Go
to Installing Damper Clamp Accessory for
Vented Operation, page 10.
NOTICE: Manual control heaters
maybeusedasaventedproduct.
Ifso,you mustalways runheater
with chimney flue damper open.
If running heater with damper
open, noncombustible material
above fireplace opening is not
needed. Go to Installing Damper
Clamp Accessory for Vented
Operation , page 10.
IMPORTANT: If you cannot meet these
minimum clearances, you must operate
heater with chimney flue damper open. Go
to Installing Damper Clamp Accessory for
Vented Operation, page 10.

9
104416
OWNER’S MANUAL
Minimum Non-
Combustible
Material
Minimum Non-
Combustible
Material Height
Distances to
Underside of
Mantel
Top of Fireplace
Opening
Underside of
Mantel Shelf
12"
8"
(A)
18"
14"
20"
16
3/4
"
22"
18
1/2
"
24"
20"
All minimum
distances are
in inches
Log Set
24"/30" Models
18" Model
2
1/2
"
6"
8"
10" Mantel Shelf
Minimum Non-
Combustible
Material 8"
Min. 12" 15" 18"
All minimum
distances are
in inches
Log Sets
18", 24",
& 30" Models
20"
2
1/2
"
6"
8"
10"
12"
Distances to
Underside of
Mantel
Hood
(GA6050, GA6052)
Top of Fireplace
Opening
Underside of
Mantel Shelf
MANTEL CLEARANCES
Inadditiontomeetingnoncombustiblemate-
rial clearances, you must also meet required
clearances between fireplace opening and
mantel shelf. If you do not meet the clear-
ances listed below, you will need a hood.
Determining Minimum Mantel
Clearances
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
hoodtherearestillcertainminimum mantel
clearancesrequired.Followminimumclear-
ances shown in Figure 7, when using hood.
Figure 6 - Minimum Mantel Clearances Without Using Hood
Figure 7 - Minimum Mantel Clearances When Using Hood
Continued
INSTALLATION
Continued
FLOOR CLEARANCES
A. If installing applianceon thefloorlevel,
you must maintain the minimum dis-
tance of 14" to combustibles (see Fig-
ure 8).
B. If combustible materials are less than
14" to the fireplace, you must install
applianceat least5" abovethe combus-
tible flooring (see Figure 9).
Figure8-MinimumFireplaceClearances
If Installed at Floor Level Figure9-MinimumFireplaceClearances
Above Combustible Flooring
NOTICE:Ifyourinstallationdoes
notmeettheminimumclearances
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
Hood
(GA6050, GA6052,
or GA6053)
14"
Min.
Combustible
Material
Noncombustible
Material
Hearth
5"
Min.
Combustible
Material

10
104416
UNVENTED NATURAL GAS LOG HEATER
DESA INTERNATIONAL
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. 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
grates.
IMPORTANT: Make sure the heater burn-
ersarelevel.Ifheaterisnotlevel,heaterwill
not work properly.
Installation Items Needed
• hardwarepackage (providedwith heater)
• approvedflexible gashose(not provided)
(if allowed by local codes)
• sealant (resistant to propane/LP gas, not
provided)
• electric drill with 3/16" drill bit
Note: Install optional GHRCT Receiver
and Hand-Held Remote Control Kit (see
Accessories, page 25) before installing gas
log heater. See installation instructions in-
cluded with the kit.
1. Apply pipe joint sealant lightly to male
threadsof gasfitting.Connect approved
flexible gas hose to inlet side of gas
control (see Figure 11, page 11).
2. Position heater base assembly in fire-
place.
3. Mark screw locations through holes in
front panel of base (see Figure 12, page
11). If installing in a brick-bottom fire-
place, mark screw locations in mortar
joint of bricks.
4. Remove heater base from fireplace.
5. Drill holes at marked locations using
3/16" masonry drill bit.
CAUTION:Do notremovethe
metal data plates attached to the
heater base assembly. The data
platescontainimportantwarranty
information.
INSTALLING DAMPER
CLAMP ACCESSORY FOR
VENTED OPERATION
Note: When used as a vented heater, appli-
ance must be installed only in a solid-fuel
burning fireplace with a working flue and
constructed of noncombustible material.
If your heater is a manually-controlled
model, you may use this heater as a vented
product. There are three reasons for operat-
ing your heater in the vented mode.
1. The fireplace does not meet the clear-
ance to combustibles requirements for
vent-free operation.
2. State or local codes do not permit vent-
free operation.
3. You prefer vented operation.
Ifreasonsnumber1or2aboveapplytoyou,
you must permanently open chimney flue
damper.Youmust install thedamperclamp
accessory (to order, see Accessories, page
25). This will insure vented operation (see
Figure 10). The damper clamp will keep
damper open. Installation instructions are
included with clamp accessory.
See chart below for minimum permanent
flue opening you must provide. Attach
damper clamp so the minimum permanent
flueopeningwill be maintainedatalltimes.
Chimney Minimum Permanent
Height (ft.) Flue Opening (sq. ins.)
6' to 15' 39 sq. inches
15' to 30' 2.9 sq. inches
Area of Various Standard
Round Flues
Diameter (ins.) Area (sq. ins.)
5" 20 sq. inches
6" 29 sq. inches
7" 39 sq. inches
8" 51 sq. inches
Figure 10 - Attaching Damper Clamp
Damper
Damper Clamp
Damper
Clamp
Damper
Damper
Manufactured Fireplace
Masonry Fireplace

11
104416
OWNER’S MANUAL
Installation Items Needed
Beforeinstallingheater,makesureyouhave
the items listed below.
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• manual shutoff valve *
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
CONNECTING TO GAS
SUPPLY
NOTICE: A qualified service per-
son must connect heater to gas
supply. Follow all local codes.
INSTALLATION
Continued
* AnA.G.A.design-certifiedmanualshutoff
valve with 1/8" NPT tap is an acceptable
alternative to test gauge connection. Pur-
chase the optional A.G.A. design-certified
manual shutoff valve from your dealer. See
Accessories, page 25.
WARNING: Never connect
heater to private (non-utility) gas
wells. This gas is commonly
known as wellhead gas.
CAUTION:Useonlynew,black
ironorsteelpipe.Internally-tinned
copper tubing may be used in
certain areas. Check your local
codes. Use pipe of 1/2" diameter
orgreatertoallowpropergasvol-
umetoheater. If pipeistoosmall,
unduelossofpressurewilloccur.
Installation must include a manual 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).
Apply pipe joint sealant lightly to male
threads. This will prevent excess sealant
from going into pipe. Excess sealant in
pipe could result in clogged heater valves.
We recommend that you install a sediment
trap in supply line as shown in Figure 13.
Locate sediment trap where it is within
reach for cleaning. Install in piping system
between fuel supply and heater. Locate
sediment trap where trapped matter is not
likely to freeze. Asediment trap traps
moisture and contaminants. This keeps
them from going into heater controls. If
sediment trap is not installed or is installed
wrong, heater may not run properly.
CAUTION: Avoid damage to
gascontrol.Holdgascontrolwith
wrenchwhenconnectingittogas
piping and/or fittings.
* Purchase the optionalA.G.A. design-certified manual shutoff valve from your dealer.
See Accessories, page 25.
** Minimum inlet pressure for purpose of input adjustment.
Figure 13 - Gas Connection
Continued
Tee
Joint
Pipe
Nipple
Cap 3" Minimum
Sediment
Trap
Gas Control
From Gas Meter
(5" W.C.** to 10.5"
W.C. Pressure)
A.G.A. Design-Certified Manual
Shutoff Valve With 1/8" NPT Tap*
Approved Flexible Gas Hose
(if allowed by local codes)
Figure 11 - Attaching Flexible Gas Hose
to Heater Gas Regulator
Figure 12 - Attaching Base to Fireplace
Floor
Gas Control
Flexible Gas Hose
(if allowed by local
codes)
Masonry
Screw
Masonry
Screw
6. Attach base to fireplace floor using
masonryscrews (inhardware package).
7. Connect to gas supply. See Connect-
ing To Gas Supply.

12
104416
UNVENTED NATURAL GAS LOG HEATER
DESA INTERNATIONAL
O
N
POSI
T
O
PO
S
Open
Closed
Manual
Shutoff
Valve
Figure 15 - Checking Gas Joints
Gas Meter
Manual Shutoff Valve
Gas Control
Location
TestPressuresEqualToorLessThan
1/2 PSIG
1. Close manual shutoff valve (see Fig-
ure 14).
2. Pressurizesupply pipingsystem byeither
usingcompressedairoropeningmaingas
valve located on or near gas meter.
3. Checkalljointsfromgasmetertomanual
shutoffvalve(seeFigure15).Applymix-
tureofliquidsoapandwatertogasjoints.
Bubbles forming show a leak.
4. Correct all leaks at once.
Figure 14 - Manual Shutoff Valve
INSTALLATION
Continued
CHECKING GAS
CONNECTIONS
WARNING: Test all gas pip-
ing and connections for leaks
after installing or servicing. Cor-
rect all leaks at once.
WARNING:Neveruseanopen
flame to check for a leak. Apply a
mixture of liquid soap and water
toalljoints.Bubblesformingshow
a leak. Correct all leaks at once.
Pressure Testing gas Supply
Piping system
TestPressuresInExcessOf1/2PSIG
1. Disconnect heater and its individual
manual 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
manual shutoff valve was connected.
3. Pressurize supply piping system by ei-
ther using compressed air or opening
main gas valve located on or near gas
meter.
4. Check all joints of gas supply piping
system. Apply mixture of liquid soap
and water to gas joints. Bubbles form-
ing show a leak.
5. Correct all leaks at once.
6. Reconnect heater and manual shutoff
valveto gassupply. Checkreconnected
fittings for leaks.
Pressure Testing Heater Gas
Connections
1. Open manual shutoff valve (see Fig-
ure 14).
2. Open main gas valve located on or near
gas meter.
3. Make sure control knob of heater is in
the OFF position.
4. Check all joints from manual shutoff
valve to gas control (see Figure 15).
Apply mixture of liquid soap and wa-
ter to gas joints. Bubbles forming show
a leak.
5. Correct all leaks at once.
6. Light heater (see Operating Heater,
pages 14 through 16). Check all other
internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to
Appliance, page 15).

13
104416
OWNER’S MANUAL
44
INSTALLING LOGS
Figure 16- Installing Front Log (#1)
Figure 17 - Installing Middle Log (#2)
Figure 18 - Installing Rear Log (#3)
WARNING: Failure to posi-
tion the parts in accordance with
these diagrams or failure to use
only parts specifically approved
withthisheatermayresultinprop-
erty damage or personal injury.
Each log is marked with a number. These
numberswillhelpyouidentifythelogwhen
installing. It is very important to install
these logs exactly as instructed. Do not
modify logs. Only use logs supplied with
heater.
1. Place front log (#1) on top of the grate.
Make sure the notches in the bottom of
the log fits over the grate prongs (see
Figure 16). Push back of log flush with
metal grate bar.
2. Rest middlelog(#2) behindmetalposts
on front burner. Make sure the grooves
in the bottom of the log fit over the
grate. Bring the log forward next to the
metal posts. The cutout on the middle
log must be on top (see Figure 17).
3. Slide the grooves in the back of the rear
log (#3) against the rear grate prongs.
Make sure the peg on the log is on top
(see Figure 18).
4. Place thecrossoverlog (#4)on theback
log and the middle log. Make sure the
peg on the rear log is in the hole in the
bottom of the crossover log. The cross-
over log should fit in the cutout of the
middle log (see Figure 19).
Middle Log (#2)
Metal Post
Groove Groove
Grate
Grate
Prongs
Metal Grate Bar
Notch Front Log
(#1)
Rear Log (#3)
Peg
Grate
Prong
Grate
Prong
Rear
Burner
Groove
in Back
of Log
Groove
in Back
of Log
Figure 19 - Installing Crossover Log (#4)
Crossover
Log (#4)
Hole
Peg
Cutout
INSTALLATION
Continued

14
104416
UNVENTED NATURAL GAS LOG HEATER
DESA INTERNATIONAL
O
F
F
P
I
L
O
T
O
N
L
O
I
H
AUTO
OFF
ON
OPERATING
HEATER
FOR YOUR SAFETY
READ BEFORE
LIGHTING
WARNING: If you do not fol-
low these instructions exactly, a
fireorexplosionmayresultcaus-
ing property damage, personal
injury or loss of life.
A. Thisappliance hasapilot whichmust
belightedbyhand.Whenlightingthe
pilot,followtheseinstructions exactly.
B. BEFORE LIGHTING smell all
aroundtheappliance areaforgas. Be
suretosmell nextto thefloorbecause
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.
• Donottouch anyelectricswitch;do
notuse anyphone inyourbuilding.
• Immediatelycall yourgassupplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
• If you cannot reach your gas sup-
plier, call the fire department.
C. Useonly yourhandtopushinor turn
thegas controlknob.Neveruse tools.
If the knob will not push in or turn
by hand, don’t try to repair it, call a
qualified service technician 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 un-
der water.
LIGHTING
INSTRUCTIONS
WARNING
• If fireplace has glass doors,
never operate this heater with
glass doors closed. If you op-
erateheaterwithdoorsclosed,
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
withafireplacescreeninplace.
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.
Orangeflamewillalsobepresent.
Open damper or window to vent
smell. This will only last a few
hours.
Note: Home owners generally prefer to
operate their heater with the chimney
damper closed. This will put all the heat
into the room. However, there may be
timesyouwill desirethefullflamesofthe
Hi heat setting but will find the heat
outputexcessive.Youcan openthechim-
ney 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.
WARNING:Burnerswillcome
on automatically within one
minute when the selector switch
is in the ON position after the
pilot is lit.
Figure 20 - Control Knob and Ignitor Button Location
Control Knob
5. Wait five(5) minutesto clearout any
gas. Then smell for gas, including
near the floor. If you smell gas,
STOP! Follow “B” in the safety in-
formation in column 1. If you don’t
smell gas, go to the next step.
6. Pressin andturncontrol knobcoun-
terclockwise to the PILOT
position. Press in control knob for
five (5) seconds (see Figure 20).
Note: You may be running this
heater for the first time after hook-
ing up to gas supply. If so, the con-
trol knob may need to be pressed in
for30 secondsorless.This willallow
air to bleed from the gas system.
7. With control knob pressed in, press
and release ignitor button. This will
lightpilot.Thepilotisattached tothe
front burner. If needed, keep press-
ing ignitor button until pilot lights.
Note: If pilot does not stay lit, con-
tact a qualified service person or gas
supplierforrepairs.Untilrepairsare
made,light pilotwith match.To light
pilot with match, see Manual Light-
ing Procedure, page 15.
Selector Switch in OFF Position
Flame
Adjustment
Knob
Ignitor Button
1. STOP! Read the safety information,
column 1.
2. Make sure manual shutoff valve is
fully open.
3. SetselectorswitchintheOFFposition.
4. Pressinand turncontrolknobclock-
wise tothe OFFposition(see
Figure 20).

15
104416
OWNER’S MANUAL
OPERATING
HEATER
Continued
TO TURN OFF GAS
TO APPLIANCE 1. Followsteps1through6 underLight-
ing Instructions, page 14.
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 9 through 12 under
Lighting Instructions, column 1.
Shutting Off Heater
1. Turncontrolknob clockwise
to the OFF position.
2a. SetselectorswitchintheOFFposition.
2b. If Using Optional Hand-Held Re-
mote: Set selector switch in the OFF
positiontokeepfromdrainingbattery.
Shutting Off Burners Only (pilot
stays lit)
You may shut off the burners and keep
thepilotlit bydoing oneof thefollowing:
1. Turncontrolknob clockwise
to the PILOT position.
2. Use remote control manual OFF
button.
3. SetselectorswitchintheOFFposition.
Continued
MANUAL LIGHTING
PROCEDURE
Ignitor Electrode
Pilot Burner
Figure 21 - Pilot
9. Slightly push in and turn control
knob counterclockwise to
the ON position.
10. Wait one minute and switch selector
switch to the ON position to light
burners. Note: AUTO is only func-
tional when using GWMT1 or
GWMS2 optional accessories.
11. Set flame adjustment knob to any
level between HI and LO.
CAUTION: Do not try to ad-
just heating levels by using the
manual shutoff valve.
8. 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 pilotgoes out,repeatsteps
4 through 8.
WARNING: Make sure the
selector switch is in the OFF po-
sition when you are away from
home for long periods of time.
Heater will come on automati-
cally with selector switch in the
ON position.

16
104416
UNVENTED NATURAL GAS LOG HEATER
DESA INTERNATIONAL
TEMP
STATUS
HI
LO
MAN ON
AUTO OFF
O
F
F
P
I
L
O
T
O
N
L
O
I
H
ON
OFF
REMOTE
OPERATING
HEATER
Continued
Figure22-SettingtheSelectorswitch,Control Knob, andFlameAdjustment Knob for
Remote Operation
Selector Toggle Switch (Optional
Remote Control)
Control Knob in
On Position Flame Adjustment Knob
Note: Allremotecontrolaccessoriesmust
bepurchasedseparately(seeAccessories,
page 25). Follow instructions included
with the remote control.
Thermostat Control Operation
(Optional GHRCT Only) The thermo-
stat control setting on the remote control
unit can be set to any comfort level be-
tween HI and LO. The burners will turn
on and off automatically to maintain the
comfort level you select. The ideal com-
fort setting will vary by household de-
pending upon the amount of space to be
heated, the output of the central heating
system, etc.
Forwall thermostatoperation, followin-
struction supplied with thermostat ac-
cessory GWMT1. For wall switch opera-
tion follow instructions supplied with
GWMS2.
Increases Room
Temperature
Decreases Room
Temperature
Turns Burners
On and Off
Shows Current
Operation Mode
Shows Temperature Setting
Allows Burners to be Turned
On and Off with the Hand-
Held Remote Unit.
OPTIONAL REMOTE
OPERATION
Figure 23 - Thermostat Hand-Held Remote Control Unit Selections (GHRCT Only)
The Log Heater will
Automatically Cycle between
Pilot and the Heat Setting
that has been Selected
GHRC Operation:
2a. PresstheON/OFFbuttonto turnthe
burners on and off. When turning
burners off, the pilot will remain lit.
GHRCT Operation:
2. Select the MAN (manual) or AUTO
buttonon thehand-held remotecon-
trol unit (see Figure 23).
• In manual mode, turn burners on
or off by pressing the ON or OFF
buttons on the hand-held remote
control unit.
• In auto mode, the room tempera-
ture is controlled by the thermo-
stat in the hand-held remote con-
trolunit.Toincrease theroomtem-
perature,pressthetoparrowofthe
TEMP button. To lower room the
temperature, press the bottom ar-
rowof theTEMPbutton.At higher
settings the heater will run more.
IMPORTANT: This remote control
has been specially engineered to take
an air temperature sample every 5.5
NOTICE: You must light the pilot
before using the remote control
unit.See LightingInstructions on
page 14.
1. Afterlighting,letpilotflame burnfor
about one minute.Turn control knob
to ON position. Adjust flame adjust-
mentknobanywherebetweenHI and
LO. Slide the selector switch to the
REMOTEposition. NOTE: Theburn-
ersmay lightifhand-held remoteON
button was on when selector switch
was last turned off.You can now turn
theburnerson andoff withthe hand-
held remote control unit.
IMPORTANT: Do not leave the se-
lectorswitchinthe REMOTE orON
positionwhenthe pilotis notlit.This
will drain the battery.
IMPORTANT: Be sure to press the
ON/OFF buttons on the hand held
remote control unit for up to 3 sec-
onds to assure proper operation.
minutes in the auto mode. It will not
respond immediately to the tempera-
turesettingbeingturnedupor down.
IMPORTANT: Thehand-heldremote
control unit must be near the heater.
Do not keep the hand-held remote
control unit too close to the heater.
The thermostat on the hand-held re-
mote control unit will heat up too
quickly and turn the heater off.
3. Usethe STATUS buttononthe hand-
held remote control unit to see the
operation mode being used and the
temperature setting selected. A red
light will come on beside the opera-
tion mode being used when the sta-
tus button is pressed.
4. To turn the burners off when operat-
inginthemanualmode,presstheOFF
button. If operating in the auto mode,
press the MAN button, then press the
OFF button. The pilot will remain lit.
IMPORTANT: To turn the pilot off,
manuallyturnthecontrolknob onthe
heater to the OFF position.

17
104416
OWNER’S MANUAL
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide. If front burner flame
patternshowsyellowtipping,fol-
lowinstructionsatbottomofthis
page.Yellowflameonrearburner
is normal.
Thermocouple
Pilot Burner
Figure 24 - Correct Pilot Flame Pattern
Figure 25 - Incorrect Pilot Flame Pattern
Figure 27 - Incorrect Front Burner Flame
Pattern
Figure 26 - Correct Front Burner Flame
Pattern
Yellow Tipping At Top
of Blue Flame
INSPECTING
BURNERS
Check pilot flame pattern and burner flame
patterns often.
PILOT FLAME PATTERN
Figure 24 shows a correct pilot flame pat-
tern. 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
Appliance, page 15)
• seeTroubleshooting, pages19 through21
FRONT BURNER FLAME
PATTERN
Figure 26 shows correct front burner flame
pattern. Figure 27 shows incorrect front
burner flame pattern. The incorrect burner
flamepatternshowsyellowtippingattopof
blue flame.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
orotherfine particlesare burned
by heater, causing brief patches
of orange flame.
If front burner flame pattern is incorrect, as
shown in Figure 27
• turn heater off (see To Turn Off Gas to
Appliance, page 15)
• seeTroubleshooting,pages 19through21
Thermocouple
Pilot Burner

18
104416
UNVENTED NATURAL GAS LOG HEATER
DESA INTERNATIONAL
CLEANING AND
MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep
control areas, burners, and cir-
culating air passageways of
heaterclean.Inspecttheseareas
of heater before each use. Have
heaterinspectedyearlybyaquali-
fied service person. Heater may
needmorefrequentcleaningdue
to excessive lint from carpeting,
bedding material, pet hair, etc.
LOGS
• If you remove logs for cleaning, refer to
Installing Logs, page 13 , to properly re-
place logs.
• Replace log(s) if broken or chipped
(dime-sized or larger).
CLEANING BURNER
INJECTOR HOLDER AND
PILOT AIR INLET HOLE
The primary air inlet holes allow the proper
amount of air to mix with the gas. This
provides a clean burning flame. Keep these
holesclearofdust,dirt,andlint.Cleanthese
air inlet holes prior to each heating season.
Blocked air holes will create soot. We rec-
ommendthatyou clean theunitevery2,500
hours of operation or every three months.
Wealsorecommendthatyoukeeptheburner
tube and pilot assembly clean and free of
dustanddirt.Tocleanthesepartswerecom-
mend using compressed air no greater than
30 PSI. Your local computer store, hard-
ware store, or home center may carry com-
pressed 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 direc-
tions on the can. If you don't follow direc-
tionsonthecan, youcoulddamagethepilot
assembly.
1. Shut off the unit, including the pilot.
Allow the unit to cool for at least thirty
minutes.
2. Inspect burner, pilot, and primary air
inlet holes on injector holder for dust
and dirt (see Figure 28).
3. Blow air through the ports/slots and
holes in the burner.
Figure 28 - Injector Holder On Outlet
Burner Tube
4. Check the injector holder located at the
end of the burner tube again. Remove
any large particles of dust, dirt, lint, or
pet hairs with a soft cloth or vacuum
cleaner nozzle.
5. Blow air into the primary air holes on
the injector holder.
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 29). With the unit off, lightly
blowair throughtheair inlethole.You may
blowthroughadrinkingstrawifcompressed
air is not available.
Burner
Tube
Injector Holder
Primary Air Inlet
Holes
Figure 29 - Pilot Inlet Air Hole
Pilot Assembly
Pilot Air Inlet
Hole
Ports/Slots
REPLACEMENT
PARTS
Note: Use only original replacement parts.
Thiswillprotectyourwarrantycoveragefor
parts replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product.
If they can’t supply original replacement
part(s), call DESA International’s Techni-
calServiceDepartment at1-800-323-5190.
When calling DESA International, have
ready
• your name
• your address
• model and serial numbers of your heater
• how heater was malfunctioning
• typeofgasused(propane/LPornaturalgas)
• purchase date
Usually,wewillaskyoutoreturnthedefec-
tive part to the factory.
PARTS NOT UNDER
WARRANTY
Contact authorized dealers of this product.
If they can’t supply original replacement
part(s), call DESA International’s Parts
Department at 1-800-972-7879 for referral
information.
When calling DESA International, have
ready
• model number of your heater
• the replacement part number

19
104416
OWNER’S MANUAL
WARNING: Turn off and un-
plug heater and let cool before
servicing. Only a qualified ser-
vice person should service and
repair heater.
CAUTION: Never use a wire,
needle, or similar object to clean
ODS/pilot.ThiscandamageODS/
pilot unit.
POSSIBLE CAUSE
1. Ignitor electrode not connected to igni-
tor cable
2. Ignitor cable pinched or wet
3. Piezo ignitor nut is loose
4. Broken ignitor cable
5. Bad piezo ignitor
6. Ignitor electrode positioned wrong
7. Ignitor electrode broken
1. Gas supply turned off or manual 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 installed
5. ODS/pilot is clogged
6. Gas control setting is not correct
1. Control knob not fully pressed in
2. Control knobnot pressed inlong enough
3. Manual shutoff valve not fully open
4. Pilot flame not touching thermocouple,
which allows thermocouple to cool,
causing pilot flame to go out. This prob-
lem could be caused by one or both of
the following:
A) Low gas pressure
B) Dirty or partially clogged ODS/pilot
5. Thermocouple connection loose at con-
trol valve
6. Thermocouple damaged
7. Gas control damaged
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
ODS/pilot lights but flame goes out when
control knob is released
TROUBLESHOOTING
REMEDY
1. Reconnect ignitor cable
2. Free ignitor cable if pinched by any
metal or tubing. Keep ignitor cable dry
3. Tightennutholding piezoignitor tobase
panel of log set. Nut is located behind
base panel
4. Replace ignitor cable
5. Replace piezo ignitor
6. Replace ignitor
7. Replace ignitor
1. Turn on gas supply or open manual
shutoff valve
2. Turn control knob to PILOT position
3. Press in control knob while in PILOT
position
4. Continue holding down control knob.
Repeat igniting operation until air is re-
moved
5. Clean ODS/pilot (see Cleaning and
Maintenance, page 18) or replace ODS/
pilot assembly
6. Replace gas control
1. Press in control knob fully
2. After ODS/pilot lights, keep control
knob pressed in 30 seconds
3. Fully open manual shut-off valve
4. A) Contact local propane gas company
B) Clean ODS/pilot (see Cleaning and
Maintenance, page 18) or replace ODS/
pilot assembly
5. Hand tighten until snug, then tighten 1/4
turn more
6. Replace thermocouple
7. Replace gas control
Continued
Note: For additional help, visit DESA
International’s Technical Service web
site at www.desatech.com.
Note: Alltroubleshootingitemsarelistedin
order of operation.
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20
104416
UNVENTED NATURAL GAS LOG HEATER
DESA INTERNATIONAL
TROUBLESHOOTING
Continued
REMEDY
1. Contact local natural gas company
2. Clean burner(s)(seeCleaningand Main-
tenance, page 18) or replace burner
orifice(s)
3. Contact qualified service person
4. Replace burner orifice(s)
5. Put remote selector in ON position
6. See Wiring Diagram, page 24
1. Contact local natural gas company
2. Clean burner(s)(seeCleaningand Main-
tenance, page 18) or replace burner
orifice(s)
3. Contact qualified service person
1. Clean burner (see Cleaning and Mainte-
nance, page 18) or replace burner orifice
2. Replace damaged burner
3. Replace gas control
1. Check burner(s) for dirt and debris. If
found,clean burner(s)(see Cleaningand
Maintenance, page 18)
2. Replace gas control
1. Problem will stop after a few hours of
operation
1. Refer to Air for Combustion and Venti-
lation requirements (page 4)
1. Turn control 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 lo-
cal natural gas company
3. Observe minimum installation clear-
ances (see pages 7 through 9)
4. Clean burners (see Cleaning and Main-
tenance, page 18) or replace burner
orifice(s)
1. Turn heater off when using furniture
polish, wax, carpet cleaners, or similar
products
1. Replace 9-volt batteries in receiver and
remote control
OBSERVED PROBLEM
One or both burners do not light after ODS/
pilot is lit
Delayed ignition of one or both burners
Burner backfiring during combustion
Yellow flame in front burner during burner
combustion
Slightsmoke or odorduringinitial operation
Moisture/condensationnoticedonwindows
Heater produces a whistling noise when
burners are lit
Whitepowderresidueformingwithinburner
box or on adjacent walls or furniture
Remote does not function
POSSIBLE CAUSE
1. Inlet gas pressure is too low
2. Burner orifice(s) clogged
3. Mislocated crossover tube
4. Burner orifice(s) diameter is too small
5. Remote selector in OFF position
6. Wire disconnected from gas control
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 control defective
1. Not enough air
2. Gas control defective
1. Residues from manufacturing processes
and logs curing
1. Not enough combustion/ventilation air
1. Turning control knob to HI position
when burners are cold
2. Air in gas line
3. Air passageways on heater blocked
4. Dirty or partially clogged burner
orifice(s)
1. When heated,vapors fromfurniture pol-
ish, wax, carpet cleaners, etc. turn into
white powder residue
1. Battery is not install. Battery power is
low
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