Desa CSG3930PR Quick start guide

UNVENTED (VENT-FREE)
GAS LOG HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
Remote-Ready Models Also Design-Certified As Vented Decorative Appliances
Save this manual for future reference.
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, per-
sonal injury, or loss of life.
— Do not store or use gasoline or other
flammablevaporsandliquidsinthevicinity
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.
• Immediatelycallyourgassupplierfroma
neighbor’s phone. Follow the gas
supplier’s instructions.
• Ifyoucannotreachyourgassupplier,call
the fire department.
— Installation and service must be performed
by a qualified installer, service agency, or
the gas supplier.
WARNING:Improperinstallation,adjustment,
alteration,service,ormaintenancecancause
injury or property damage. Refer to this
manual for correct installation and opera-
tional procedures. For assistance or addi-
tionalinformationconsultaqualifiedinstaller,
service agency, or the gas supplier.
WARNING: This appliance is for installa-
tiononlyinasolid-fuelburningmasonryor
UL127factory-builtfireplace,orinanlisted
ventless firebox enclosure. It is design-
certified for these installations in accor-
dance with ANSI Z21.11.2. Exception: Do
not install this appliance in a factory-built
fireplace that includes instructions stating
ithasnotbeentestedorshouldnotbeused
with unvented gas logs. For unmarked fac-
tory-builtfireplaces,contactfireplacemanu-
facturer if unsure of this application.
WARNING: This is an unvented gas-fired heater. It uses air (oxygen) from the room in which
it is installed. Provisions for adequate combustion and ventilation air must be provided. Refer
to Air for Combustion and Ventilation section on page 5 of this manual.
For more information, visit www.desatech.com
For more information, visit www.desatech.com
This appliance may be installed in an aftermarket,* permanently located, manufactured
(mobile) home, where not prohibited by local codes.
This appliance is only for use with the type of gas indicated on the rating plate. This appliance
is not convertible for use with other gases.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
24" and 30"Remote-Ready Models:
VRL24NR, VRL24PR, VRL30NR,
VRL30PR, CSG3924NR, CSG3924PR
CTB3924NR, CTB3924PR
CSG3930NR, CSG3930PR
24" and 30" Thermostat Models:
VRL24NT, VRL24PT, VRL30NT,
VRL30PT, CSG3924NT, CSG3924PT,
CTB3924NT, CTB3924PT

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
2
WARNING: Do not use a blower insert, heat
exchanger insert, or other accessory not approved
for use with this heater.
WARNING: This appliance is for installation only
inasolid-fuelburningfireplaceorapprovedventless
firebox enclosure.
WARNING:Donot allow fans to blow directly into
the fireplace. Avoid any drafts that alter burner flame
patterns. Ceiling fans can create drafts that alter
burner flame patterns. Altered burner patterns can
cause sooting.
Due to high temperatures, the appliance should be
located out of traffic and away from furniture and
draperies.
Do not place clothing or other flammable material on
ornear the appliance. Never placeanyobjectson the
heater.
Heater base assembly becomes very hot when run-
ning heater. Keep children and adults away from hot
surface to avoid burns or clothing ignition. Heater
will remain hot for a time after shutdown. Allow
surface to cool before touching.
Carefully supervise young children when they are in
the room with heater. When using the hand-held
remoteaccessory(Remote-ReadyModelsOnly),keep
selector switch in the OFF position to prevent chil-
dren from turning on burners with remote.
SAFETY INFORMATION
DANGER: Carbon monoxide poisoning may lead
to death!
Carbon Monoxide Poisoning: Early signs of carbon monoxide
poisoning resemble the flu, with headaches, dizziness, or nausea.
If you have these signs, the heater may not be working properly.
Get fresh air at once! Have heater serviced. Some people are
more affected by carbon monoxide than others. These include
pregnant women, people with heart or lung disease or anemia,
those under the influence of alcohol, and those at high altitudes.
Natural and Propane/LP Gas: Natural and propane/LP gases are
odorless. An odor-making agent is added to the gas. The odor
helpsyoudetectagasleak.However,theodoraddedtothegascan
fade. Gas may be present even though no odor exists.
Makecertainyoureadandunderstandallwarnings.Keepthismanual
forreference.Itisyourguidetosafeandproperoperationofthisheater.
WARNINGS
IMPORTANT: Read this owner’s manual carefully and
completely before trying to assemble, operate, or ser-
vicethisheater.Improper use of this heater can cause
property damage and serious injury or death from
burns, fire, explosion, electrical shock, and carbon
monoxide poisoning.
WARNING: Any change to this heater or its con-
trols can be dangerous.
TABLE OF CONTENTS
SAFETY INFORMATION
TABLE OF CONTENTS
SAFETY INFORMATION ............................................................ 2
PRODUCT IDENTIFICATION ..................................................... 4
OPTIONAL REMOTE CONTROLACCESSORIES .................... 4
LOCAL CODES........................................................................... 4
UNPACKING ............................................................................... 4
PRODUCT FEATURES .............................................................. 5
AIR FOR COMBUSTION AND VENTILATION ........................... 5
INSTALLATION ........................................................................... 8
OPERATING HEATER.............................................................. 17
INSPECTING BURNERS.......................................................... 22
CLEANING AND MAINTENANCE ............................................ 23
TROUBLESHOOTING .............................................................. 24
OPTIONAL POSITIONING OF THERMOSTAT
SENSING BULB............................................................... 27
SPECIFICATIONS .................................................................... 28
WIRING DIAGRAM ................................................................... 28
ILLUSTRATED PARTS BREAKDOWNAND PARTS LIST ....... 29
ACCESSORIES ........................................................................ 34
OWNER’S REGISTRATION FORM.......................................... 35
REPLACEMENT PARTS .......................................................... 37
SERVICE HINTS....................................................................... 37
TECHNICAL SERVICE ............................................................. 37
WARNING:Thisproductcontainsand/orgenerates
chemicals known to the State of California to cause
cancer or birth defects, or other reproductive harm.

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
3
3
You must operate this heater with a fireplace screen
in place. Make sure fireplace screen is closed before
running heater.
Keeptheappliance area clear and free from combus-
tiblematerials,gasoline,andotherflammablevapors
and liquids.
SAFETY INFORMATION
Continued
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) inside 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 fire department
4. 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 11 (Remote-
Ready Models Only).
5. Before installing in a solid fuel burning fireplace, the chimney
flue and firebox must be cleaned of soot, creosote, ashes and
loose paint by a qualified chimney cleaner. Creosote will ig-
nite if highly heated.Adirty chimney flue may create and dis-
tribute soot within the house. Inspect chimney flue and fire-
boxfor damage. If damaged, repairflue beforeoperating heater.
6. Do not burn solid-fuel in a masonry or UL127 factory-built
fireplace in which a vent-free room heater is installed.
7. If fireplace has glass doors, never operate this heater with glass
doors closed. If you operate heater with doors closed, heat
buildup inside fireplace will cause glass to burst. Make sure
there are no obstructions across openings of fireplace.
8. To prevent thecreation ofsoot, follow the instructions inClean-
ing and Maintenance, page 23.
9. Before using furniture polish, wax, carpet cleaner, or similar
products, turn heater off. If heated, the vapors from these prod-
ucts 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 Depletion Sensing (ODS) safety
shutoff system.The ODS shuts down the heater if enough fresh
air is not available. See Air for Combustion and Ventilation,
pages 5 through 7. If heater keeps shutting off, see Trouble-
shooting, pages 24 through 26.
11. Do not run heater
• where flammable liquids or vapors are used or stored
• under dusty conditions
12. Do not use this heater to cook food or burn paper or any other
type of solid fuels.
13. Do not use heater if any part has been exposed to or under
water. Immediately call a qualified service technician to in-
spect 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 re-
pairing. Make sure the selector switch is in the OFF position
(Remote-Ready Models Only). Only a qualified service per-
son should install, service, or repair heater.
16. Make sure the selector switch is in the OFF position when you
are away from home for long periods of time (Remote-Ready
Models Only).
17. Remote-ready heaters do not need to be connected to any ex-
ternal electrical source.
18. Operating heater above elevations of 4,500 feet may cause pi-
lot outage.
19. To prevent performance problems with propane/LP models,
do not use propane/LP fuel tank of less than 100 lb. capacity.
20. Provide adequate clearances around air openings.
SAFETY INFORMATION

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
4
LOCAL CODES
Install and use heater with care. Follow all local codes. In the
absence of local codes, use the latest 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.
1. Remove logs and heater base assembly from carton. Note: Do
not pick up heater base assembly by burners. This could damage
heater. Always handle base assembly by the sides of assembly.
2. Remove all protective packaging applied to logs and heater
for shipment.
3. Check all items for any shipping damage.If damaged,promptly
inform dealer where you bought heater.
UNPACKING
CAUTION:Donotremovethe dataplatesfromthe
base assembly. The data plates contain important
warranty and safety information.
OPTIONAL REMOTE
CONTROL ACCESSORIES
There are four optional remote controls that can be purchased
separately for Remote-Ready Models Only:
• wall switch • hand-held ON/OFF remote
• wall thermostat • hand-held thermostat remote.
See Accessories, page 34.
Thewallthermostatorhand-heldthermostatmaynotbeusedwhere
vented decorative listing is required.
Base Assembly
Piezo Ignitor
Front and Rear
Burner Control
Knob
Selector
Switch
(Optional)
ON/OFF/
PILOT Knob
Remote Control
(Optional)
Grate
Front
Burner
Remote-Ready Models: CSG3924NR, CSG3924PR, CTB3924NR,
CTB3924PR, CSG3930NR, CSG3930PR, VRL24NR, VRL24PR,
VRL30NR, VRL30PR
Rear
Burner
Figure 1 - Product Identification
PRODUCT IDENTIFICATION
Log Set (Varies
According to Model)
Base
Assembly
Front and Rear
Burner Control
Knob
Piezo
Ignitor Burner
Control Knob
Thermostat Models: CSG3924NT, CSG3924PT, CTB3924NT,
CTB3924PT, VRL24NT, VRL24PT, VRL30NT, VRL30PT
Grate
Pilot
Assembly
PRODUCT IDENTIFICATION
OPTIONAL REMOTE CONTROL ACCESSORIES
LOCAL CODES
UNPACKING
Middle
Burner

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
5
5
AIR FOR COMBUSTION AND
VENTILATION
Today’s homes are built more energy efficient than ever. New mate-
rials,increased insulation, andnew construction methods help reduce
heat loss in homes. Home owners weather strip and caulk around
windowsanddoorstokeepthecoldairoutandthewarmairin.During
heatingmonths,homeownerswanttheirhomesasairtightaspossible.
While it is good to make your home energy efficient, your home
needs to breathe. Fresh air must enter your home. All fuel-burning
appliances need fresh air for proper combustion and ventilation.
Exhaustfans,fireplaces,clothesdryers,andfuelburningappliances
drawairfromthehousetooperate.Youmustprovideadequatefresh
air for these appliances. This will insure proper venting of vented
fuel-burning appliances.
WARNING: This heater shall not be installed in a
confined space or unusually tight construction un-
less provisions are provided for adequate combus-
tion and ventilation air. Read the following instruc-
tionstoinsureproper freshair forthisand otherfuel-
burning appliances in your home.
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 following ventilation
classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 5 through 7 will help you classify your
space and provide adequate ventilation.
Unusually Tight Construction
The air that leaks around doors and windows may provide enough
fresh air for combustion and ventilation. However, in buildings of
unusually tight construction, you must provide additional fresh air.
Unusually tight construction is defined as construction
where:
a. walls and ceilings exposed to the outside 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 win-
dows and doors and
c. caulking or sealants are applied to areas such as
joints around window and door frames,between sole
platesandfloors,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 the three criteria above,
you must provide additional fresh air.See Ventilation
Air From Outdoors , page 7 .
Ifyourhomedoesnot meet all of the three criteria above,
proceed to Determining Fresh-Air Flow For Heater Loca-
tion, page 6.
Confined and Unconfined Space
The National Fuel Gas Code, ANSI Z223.1/NFPA 54 defines a
confined space as a space whose volume is less than 50 cubic feet
per 1,000 Btu per hour (4.8 m3per kw) of the aggregate input rating
of all appliances installed in that space and an unconfined space as
aspacewhosevolumeisnotlessthan50cubicfeetper1,000Btuper
hour (4.8 m3per 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
furnishedwithdoors,areconsideredapartoftheunconfinedspace.
* Adjoining rooms are communicating only if there are doorless
passageways or ventilation grills between them.
PRODUCT FEATURES
OPERATION
This heater is clean burning. It requires no outside venting. There is
no heat loss out a vent or up a chimney. Heat is generated by both
realistic flames and glowing coals. This heater is designed for vent-
free operation with flue damper closed. It has been tested and
approved to ANSI Z21.11.2 standard for unvented heaters. State and
local codes in some areas prohibit the use of vent-free heaters. This
heater may also be operated as a vented decorative (ANSI Z21.60)
product by opening the flue damper (Remote-Ready Models Only).
SAFETY DEVICE
This heater has a pilot with an Oxygen Depletion Sensing (ODS)
safety shutoff system. The ODS/pilot is a required feature for vent-
free room heaters. The ODS/pilot shuts off the heater if there is not
enough fresh air.
PIEZO IGNITION SYSTEM
This heater has a piezo ignitor. This system requires no matches,
batteries, or other sources to light heater.
PRODUCT FEATURES
Operation
Safety Device
Piezo Ignition System
AIR FOR COMBUSTION AND VENTILATION
Providing Adequate Ventilation

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
6
DETERMINING FRESH-AIR FLOW FOR
HEATER LOCATION
Determining if You Have a Confined or
Unconfined Space
Usethis worksheettodetermineif youhave aconfinedor unconfinedspace.
Space:Includestheroominwhichyouwillinstallheaterplusanyadjoining
rooms with doorless passageways or ventilation grills between the rooms.
1. Determine the volume of the space (length x width x height).
Length x Width x Height = ___________ cu. ft. (volume of space)
Example: Space size 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling
height) = 2560 cu. ft. (volume of space)
Ifadditional ventilationtoadjoiningroomis suppliedwith grillsor open-
ings, 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 = (Maximum 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 fireplace logs _____________ Btu/Hr
Other gas appliances* + _____________ Btu/Hr
Total = _____________ Btu/Hr
* Do not include direct-vent gas appliances. Direct-vent draws com-
bustion 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)
AIR FOR COMBUSTION AND
VENTILATION
Continued
WARNING: If the area in which the heater may be
operated is smaller than that defined as an uncon-
fined space or if the building is of unusually tight
construction,provideadequatecombustionandven-
tilation air by one of the methods described in the
National Fuel Gas Code, ANSI Z223.1/NFPA 54 Sec-
tion 5.3 or applicable local codes .
Thespacein the above example isaconfinedspace because the actual Btu/
Hrusedis morethanthemaximumBtu/Hrthespacecansupport.Youmust
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 adjoining
room or add ventilation grills between rooms. See Ventilation Air
From Inside Building, page 7.
B. Vent room directly to the outdoors. See Ventilation Air From Out-
doors, page 7.
C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room
unconfined.
If the actual Btu/Hr used is less than the maximum Btu/Hr the space can
support, the space is an unconfined space. You will need no additional
fresh air ventilation.
40,000
39,000
79,000
AIR FOR COMBUSTION AND VENTILATION
Determining Fresh-Air Flow For Heater Location

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
7
7
AIR FOR COMBUSTION AND
VENTILATION
Continued
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining unconfined space.
When ventilating to an adjoining unconfined space, you must
provide two permanent openings: one within 12" of the ceiling and
one within 12" of the floor on the wall connecting the two spaces
(see options 1 and 2, Figure 2). You can also remove door into
adjoining room (see option 3, Figure 2). Follow the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion
and Ventilation for required size of ventilation grills or ducts.
Ventilation Air From Outdoors
Provideextrafreshairbyusingventilationgrills orducts.Youmust
provide two permanent openings: one within 12" of the ceiling and
one within 12" of the floor. Connect these items directly to the
outdoorsorspacesopentotheoutdoors.Thesespacesincludeattics
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.
AIR FOR COMBUSTION AND VENTILATION
Ventilation Air
Figure 3 - Ventilation Air from Outdoors
Figure 2 - Ventilation Air from Inside Building
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"

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
8
NOTICE: This heater is intended for use as supple-
mental heat. Use this heater along with your primary
heating system. Do not install this heater as your
primary 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
throughoutthehouse.Intheeventofapoweroutage,
you can use this heater as your primary heat source.
WARNING:Installationandrepairshouldbedone
by a qualified service person. The appliance should
be inspected before use and at least annually by a
professional service person. More frequent cleaning
mayberequiredduetoexcessivelintfromcarpeting,
bedding material, etc. It is imperative that control
compartments, burners and circulating air passage-
ways of the appliance be kept clean.
NOTICE:Stateorlocalcodesmayonlyallowoperation
ofthisapplianceinaventedconfiguration.Checkyour
state or local codes (Remote-Ready Models Only).
WARNING:Makesuretheselectorswitchisinthe
OFFpositionbeforeinstallingheater(Remote-Ready
Models Only).
WARNING: Before installing in a solid fuel burn-
ing fireplace, the chimney flue and firebox must be
cleaned of soot, creosote, ashes and loose paint by
a qualified chimney cleaner. Creosote will ignite if
highly heated. A dirty chimney flue may create and
distribute soot within the house. Inspect chimney
flue and firebox for damage. If damaged, repair flue
before operating heater.
WARNING: Seal any fresh air vents or ash clean-
out doors located on floor or wall of fireplace. If not,
drafting may cause pilot outage or sooting. Use a
heat-resistant sealant. Do not seal chimney flue
damper.
INSTALLATION
INSTALLATION AND CLEARANCES FOR
VENT-FREE OPERATION
WARNING: Maintain the minimum clearances. If
possible, provide greater clearances from floor, ceil-
ing, and adjoining wall.
IMPORTANT: Vent-free heaters add moisture to the air. Although
this is beneficial, installing heater in rooms without enough venti-
lation air may cause mildew to form from too much moisture. See
Air for Combustion and Ventilation, pages 5 through 7.
CHECK GAS TYPE
Use the correct gas type (natural or propane/LP) for your unit. If
your gas supply is not correct, do not install fireplace. Call dealer
where you bought fireplace for proper type fireplace.
WARNING: Never install the heater
•in a bedroom or bathroom unless installed as a
ventedappliance,seepage11(Remote-ReadyMod-
els Only)
•in a recreational vehicle
•where curtains, furniture, clothing, or other flam-
mable objects are less than 42 inches from the
front, top, or sides of the firebox opening
•in high traffic areas
•in windy or drafty areas
CAUTION: This heater creates warm air currents.
These currents move heat to wall surfaces next to
heater. Installing heater next to vinyl or cloth wall
coveringsoroperatingheaterwhereimpurities(such
as, but not limited to, tobacco smoke, aromatic
candles, cleaning fluids, oil or kerosene lamps, etc.)
in the air exist, may discolor walls or cause odors.
LOG SIZING REQUIREMENTS
Log Minimum Firebox
Size Height Depth Front Rear *
Width Width
24" 17" 14" 28" 20 1/4"
30" 17" 14" 34" 22 3/8"
* Measured at 14" depth.
INSTALLATION
Check Gas Type
Installation and Clearances For Vent-Free Operation

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
9
9
Heat Resistant
Material (A)
Carefully follow the instructions below. This will ensure safe
installation into a masonry, UL127-listed manufactured fireplace,
or listed vent-free firebox.
Minimum Clearances For Side Combustible
Material, Side Wall, and Ceiling
A. Clearances from the side of the fireplace cabinet to any com-
bustible material and wall should follow diagram in Figure 4.
Example: The face of a mantel, bookshelf, etc. is made of
combustible material and protrudes 3 1/2" from the wall. This
combustible material must be 4" from the side of the fireplace
cabinet (see Figure 4).
Note: Wheninstallingyour gaslogs intoa manufactured firebox,
follow firebox manufacturer’s instructions for minimum clear-
ances to combustible materials.
B. Clearances from the top of the fireplace opening to the ceiling
should not be less than 42 inches.
Figure 4 - Minimum Clearance for Combustible to Wall
*Minimum 16 inches from Side Wall
*
Example
INSTALLATION
Continued
Figure 5 - Heat Resistant Material (Slate, Marble, Tile, etc.)
Above Fireplace
Noncombustible Requirements for
Material Distance (A) Safe Installation
12" or more Noncombustible material OK.
Between 8" and 12" 24" or 30" Models: Install
fireplace hood accessory
(GA6050, GA6052, or
GA6053 see Accessories ,
page 34).
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 flue damper open.
Minimum Noncombustible Material Clearances
If Not Using Mantel
Note: If using a mantel proceed to If Using Mantel . If not using a
mantel, follow the information on this page.
You must have noncombustible material(s) above the fireplace
opening.Noncombustiblematerials(suchasslate,marble,tile,etc.)
must be at least 1/2 inch thick. With sheet metal, you must have
noncombustible material behind it. Noncombustible material must
extend at least 8" up (for all models). If noncombustible material is
lessthan12",youmustinstallthefireplacehoodaccessory(24"and
30" models only). See Figure 5 for minimum clearances.
NOTICE: Manual control heaters may be used as a
ventedproduct.Ifso,youmust alwaysrunheaterwith
chimney flue damper open. If running heater with
damper open, noncombustible material above fire-
place opening is not needed. Go to Installing Damper
Clamp Accessory for Vented Operation, page 11.
If Using Mantel
You must have noncombustible material(s) above the fireplace
opening.Noncombustiblematerials(suchasslate,marble,tile,etc.)
must be at least 1/2 inch thick. With sheet metal, you must have
noncombustible material behind it. Noncombustible material must
extend at least 8 inches up. If noncombustible material is less than
12",youmustinstallthefireplacehoodaccessory.Evenifnoncom-
bustiblematerialismorethan12",youmayneedthehoodaccessory
to deflect heat away from your mantel shelf. See Figure 5 and
Figures 6 and 7, page 10, for minimum clearances.
IMPORTANT: If you cannot meet these minimum clearances, you
must operate heater with chimney flue damper open. Go to Install-
ing Damper Clamp Accessory for Vented Operation, page 11.
INSTALLATION
Installation and Clearances For Vent-Free Operation (Cont.)

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
10
Hearth
5"
Min.
Combustible
Material
Hearth Combustible
Material
5"
14"
Min.
Combustible
Material
Non-Combustible Material
Minimum Non-
Combustible
Material 8"
Min. 12" 15" 18"
All minimum
distances are
in inches
20"
2
1/2
"
6"
8"
10"
12"
Distances to
Underside of
Mantel
Hood
(GA6050, GA6052)
Top of Fireplace
Opening
Underside of
Mantel Shelf
Mantel Shelf
INSTALLATION
Continued
MANTEL CLEARANCES
In addition to meeting noncombustible material clearances, you
mustalsomeetrequiredclearancesbetweenfireplaceopeningand
mantel shelf. If you do not meet the clearances listed below, you
will need a hood.
Determining Minimum Mantel Clearance
If you meet minimum clearance between mantel shelf and top of
fireplace opening, a hood is not required (see Figure 6).
Determining Minimum Mantel Clearance When
Using a Hood
If minimum clearances in Figure 6 are not met, you must have a
hood. When using a hood there are still certain minimum mantel
clearances required. Follow minimum clearances shown in Fig-
ure 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.
Followallminimumclearancesshowninthismanual.
NOTICE:Ifyourinstallationdoesnotmeettheminimum
clearances shown, you must do one of the following:
•operate the logs only with the flue damper open
•raise the mantel to an acceptable height
•remove the mantel
FLOOR CLEARANCES
A. If installing appliance on the floor level, you must maintain
the minimum distance of 14" to combustibles (see Figure 8).
B. If combustible materials are less than 14" to the fireplace, you
must install appliance at least 5" above the combustible floor-
ing (see Figure 9).
Figure 6 - Minimum Mantel Clearances Without Using Hood
Figure 8 - Minimum Fireplace
ClearancesIfInstalledatFloor
Level
Figure 9 - Minimum Fireplace
Clearances Above
Combustible Flooring
Figure 7 - Minimum Mantel Clearances When Using Hood
Noncombustible Material
Hood
(GA6050, GA6052,
or GA6053)
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"
INSTALLATION
Mantel Clearances
Floor Clearances

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
11
11
INSTALLING DAMPER CLAMP ACCESSORY
FOR VENTED OPERATION
(Remote-Ready Models Only)
Note: When used as a vented heater, appliance 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, you may use this heater as
a vented product. There are three reasons for operating your heater
in the vented mode.
1. The fireplace does not meet the clearance to combustibles re-
quirements for vent-free operation.
2. State or local codes do not permit vent-free operation.
3. You prefer vented operation.
If reasons number 1 or 2 above apply to you, you must permanently
open chimney flue damper. You must install the damper clamp
accessory(toorder,seeAccessories,page34).Thiswillinsurevented
operation(seeFigure10). Thedamperclampwillkeepdamperopen.
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 flue
opening will be maintained at all times.
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
Chimney Minimum Permanent
Height (ft.) Flue Opening (sq. ins.)
6' to 15' 39 sq. inches
15' to 30' 29 sq. inches
INSTALLATION
Continued
INSTALLING HEATER BASE ASSEMBLY
WARNING: You must secure this heater to fire-
place floor. If not, heater will move when you adjust
controls. Moving heater may cause a gas leak.
WARNING: If installing in a sunken fireplace, spe-
cialcareisneeded.Youmustraisethefireplacefloorto
allow access to heater control panel. This will insure
adequate air flow and guard against sooting and con-
trolsbeingdamaged.Raisefireplacefloorwithnoncom-
bustible material. Make sure material is secure.
CAUTION: Do not pick up heater base assembly
by burners. 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. For thermostat models,
avoid damage to thermostat bulb. Avoid nicks or sharp bends in
thermostat bulb wire. Keep thermostat bulb in mounting bracket
until ready to mount base to floor. See Optional Positioning of
Thermostat Sensing Bulb, page 27.
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 provided)
• electric drill with 3/16" drill bit (metal or masonry as applicable)
• flathead screwdriver
1. Connectfittingto base asshown in Figure11.Connect approved
flexible gas hose to fitting in base (see Figure 11).
IMPORTANT: Hold gas fitting with wrench when connecting
flexible gas hose.
Figure 10 - Attaching Damper Clamp
Damper
Damper
Manufactured Fireplace
Masonry Fireplace
Damper Clamp
Damper
Figure 11 - Attaching Flexible Gas Hose to Heater
Fitting
Flexible Gas Hose (if
allowed by local codes)
INSTALLATION
Installing Damper Clamp Accessory For Vented Operation
Installing Heater Base Assembly
Damper
Clamp

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
12
WARNING: This appliance requires a 1/2" NPT
(National Pipe Thread) inlet connection to the pres-
sure regulator.
WARNING: A qualified service person must con-
nect heater to gas supply. Follow all local codes.
CAUTION: For propane/LP gas, never connect
heater directly to the propane/LP supply. This heater
requires an external regulator (not supplied). Install
the external regulator between the heater and pro-
pane/LP supply.
Installation Items Needed
Beforeinstallingheater,makesureyouhavetheitemslistedbelow.
• external regulator for propane/LP only (supplied by installer)
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve *
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
* A CSA design-certified equipment shutoff valve with 1/8" NPT
tap is an acceptable alternative to test gauge connection. Purchase
the optional CSA design-certified equipment shutoff valve from
your dealer. See Accessories, page 34.
Forpropane/LP only, theinstallermustsupplyanexternalregulator.
The external regulator will reduce incoming gas pressure. You must
reduce incoming gas pressure to between 11 and 14 inches of water.
If you do not reduce incoming gas pressure, heater regulator damage
couldoccur.Install external regulatorwith the ventpointingdown as
shown inFigure13, page 13. Pointingthe vent downprotectsit from
freezing rain or sleet.
WARNING:Fornaturalgas,neverconnect heater
to private (non-utility) gas wells. This gas is com-
monly known as wellhead gas.
CAUTION: Use only new, black iron or steel pipe.
Internally-tinned copper tubing may be used in certain
areas. Check your local codes. Use pipe of 1/2" inside
diameterorgreatertoallowpropergasvolumetoheater.
If pipe is too small, undue loss of volume will occur.
INSTALLATION
Continued
2. Locate two masonry screws in hardware package.
3. Place heater base in fireplace.
4. Place logs in their proper position on heater base (see Installing
Logs, pages 15 and 16).
5. Center heater base and logs front-to-back and side-to-side in
fireplace.
6. Carefully remove logs without moving heater base.
7. Mark screw locations through one hole on each side of the
mounting bracket (see Figure 12). If installing in a brick-bot-
tom fireplace, mark screw locations in mortar joint of bricks.
8. Remove heater base from fireplace. If installing optional con-
trol accessories, do so at this time. Follow all directions pro-
vided with accessory.
9. Drill holes at marked locations using 3/16" drill bit.
10. Attach base assembly to fireplace floor using two masonry
screws (in hardware package).
Figure 12 - Attaching Base Assembly to Fireplace Floor
(30" Model Shown)
Masonry
Screw
Mounting
Flange
CONNECTING TO GAS SUPPLY
INSTALLATION
Installing Heater Base Assembly (Cont.)
Connecting To Gas Supply

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
13
13
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 14 or
15, depending on your model).
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 requirements for locating
equipment shutoff valve to fireplaces.
Apply pipe joint sealant lightly to male NPT threads. This will
prevent excess sealant from going into pipe. Excess sealant in pipe
could result in clogged heater valves.
WARNING: Use pipe joint sealant that is resistant
to liquid petroleum (LP) gas.
Werecommendthatyouinstallasedimenttrapinsupplylineasshown
in Figure 14 or 15, depending on your model. Locate sediment trap
where it is within reach for cleaning. Install in piping system between
fuelsupplyandheater.Locatesedimenttrapwheretrappedmatterisnot
likelytofreeze. Asedimenttraptrapsmoistureandcontaminants.This
keeps them from going into heater controls. If sediment trap is not
installed or is installed wrong, heater may not run properly.
CAUTION: Avoid damage to regulator. Hold gas
regulator with wrench when connecting it to gas
piping and/or fittings (Thermostat-Controlled Mod-
els Only).
CAUTION:Avoiddamagetogascontrol.Holdgas
controlwithwrench whenconnecting itto gaspiping
and/or fittings (Remote-Ready Models Only).
INSTALLATION
Continued
Propane/LP
Supply Tank
External Regulator
Figure 13 - External Regulator With Vent Pointing Down
Vent Pointing Down
Figure 14 - Gas Connection (Thermostat-Controlled Models
Only)
Tee Cap Pipe
Joint Nipple
3" Minimum
Gas Regulator
PROPANE/LP -
From External
Regulator
(11" W.C.**
to 14" W.C.
Pressure)
CSA Design-Certified Equipment
Shutoff Valve With 1/8" NPT Tap*
Approved Flexible
Gas Hose (if allowed
by local codes)
Sediment Trap
NATURAL -
From Gas
Meter
(5" W.C.**
to 10.5" W.C.
Pressure)
* Purchase the optional CSA design-certified equipment shutoff valve
from your dealer. See Accessories, page 34.
**Minimum inlet pressure for purpose of input adjustment.
Figure 15 - Gas Connection (Remote-Ready Models Only)
Gas Control
Valve
Tee Pipe
Joint Nipple Cap
3" Minimum
Sediment Trap
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-Certified Equipment
Shutoff Valve With 1/8" NPT Tap*
Approved Flexible
Gas Hose (if allowed
by local codes)
INSTALLATION
Connecting To Gas Supply (Cont.)

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
14
ON
POSITION
OFF
POSITION
INSTALLATION
Continued
WARNING: Test all gas piping and connections,
internal andexternal to unit, for leaks after installing
or servicing. Correct all leaks at once.
WARNING: Never use an open flame to check for
aleak.Applyanoncorrosiveleakdetectionfluidtoall
joints.Bubblesformingshowaleak.Correctallleaks
at once.
CAUTION: Makesureexternal regulatorhasbeen
installedbetweenpropane/LPsupplyandheater.See
guidelinesunder ConnectingtoGasSupply ,page12.
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 sys-
tem. 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 tankvalve for propane/LPgas oropening main gas valve
located on or near gas meter for natural gas, or using com-
pressed air.
4. Check all joints of gas supply piping system.Apply a noncorrosive
leak detection fluid to all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff valve to gas supply.
Check reconnected fittings for leaks.
Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 16).
2. Pressurizesupplypipingsystembyeitheropeningpropane/LPsup-
ply tank valve for propane/LP gas or opening main gas valve lo-
catedonor near gasmeter for naturalgas,or using compressedair.
3. Check all joints from gas meter for natural or propane/LP sup-
ply to equipment shutoff valve (see Figure 17 or 18). Apply a
noncorrosive leak detection fluid to all joints. Bubbles form-
ing show a leak.
4. Correct all leaks at once.
CHECKING GAS CONNECTIONS
Figure 16 - Equipment Shutoff Valve
Figure 17 - 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
Pressure Testing Heater Gas Connections
1. Open equipment shutoff valve (see Figure 16).
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(Thermostat-ControlledModels) or control valve (Remote-
Ready Models) (seeFigure 17 or 18).Apply a noncorrosiveleak
detection fluid to all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light heater (see Operating Heater, pages 17 through 21).
Check all other internal joints for leaks.
7. Turn offheater (see To TurnOff Gas toAppliance,page 18 [Ther-
mostat-ControlledModels]orpage20 [Remote-Ready Models]).
INSTALLATION
Checking Gas Connections
Figure 18 - Checking Gas Joints (Natural Gas Only)
Thermostat Gas Valve or
Control Valve Location
Gas Meter
Equipment Shutoff Valve

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
15
15
INSTALLING LOGS
WARNING: Failure to position the parts in accor-
dance with these diagrams or failure to use only parts
specifically approved with this heater may result in
property damage or personal injury.
CAUTION: After installation and periodically there-
after, check to ensure that no yellow flame comes in
contact with any log. With the heater set to HI, check to
see if flames contact any log. If so, reposition logs
according to the log installation instructions in this
manual.Yellowflamescontactinglogs willcreate soot.
It is very important to install the logs exactly as instructed. Do not
modify logs. Only use logs supplied with heater. Before installing
logs, make sure log alignment screws are in place and straight.
Models CSG3924NT, CSG3924PT, CSG3924NR,
CSG3924PR,CTB3924NT,CTB3924PT,CTB3924NR
CTB3924PR, CSG3930NR, and CSG3930PR,
1. Place log #1 (ember bed) onto base. Position log over alignment
screws to left of front burner and behind middle burner. Ember
bed will sit on top of front and middle burners (see Figure 19).
2. Place log #2 to the right of log #1. Log #2 will wrap around right
endof rear burner and sit on logalignment screw(see Figure 20).
3. Place log #3 on left side of base and onto alignment screw to
right of rear burner (see Figure 20). Log #3 will wrap around
left end of rear burner.
4. Place log #4 onto two alignment screws to the rear of base (see
Figure 21).
5. Place back of log #5 on notch in log #4 (as shown in Figure
22), across back part of log #1 and onto pin on log #2 (see
Figures 20 and 22).
6. Place log #6 onto two pins on log #1 (ember bed) and rest
back of log #6 on back log #4 (see Figure 22).
INSTALLATION
Installing Logs
INSTALLATION
Continued
Figure 19 - Installing Log #1 (Ember Bed) (Model CSG3924NR
Shown)
Figure 20 - Installing Log #2 (Right) and Log #3 (Left)
(Model CSG3924NR Shown)
Figure 21 - Installing Log #4 (Model CSG3924NR Shown)
Figure 22 - Installing Log #5 (Right) and Log #6 (Left)
(Model CSG3924NR Shown)
Log #5
Log #6
Log #4
Log #3
Log #1
Log #2
Log #4
Log #3
Log #1
Log #2
Log #3
Log #1
Log #2
Log #1
Log #5 will seat in
this location.

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
16
INSTALLATION
Continued
Models VRL24NR, VRL24PR, VRL30NR, VRL30PR,
VRL24NT, VRL24PT, VRL30NT and VRL30PT
1. Place log #1 (ember bed) onto base over log alignment screws
to the left of front burner and behind middle burner. Log #1
will sit on top of front and middle burners (see Figure 23).
2. Place log #2 to right of log #1 and onto log alignment screw as
shown in Figure 24. Log #2 will wrap around right end of rear
burner (see Figure 24).
3. Place log #3 on left side of base and onto alignment screw to
right of rear burner (see Figure 24). Log #3 will wrap around
left end of rear burner.
4. Place log #4 onto two alignment screws to rear of base (see
Figure 25).
5. Locate hole on bottom of log #5 and place over pin on log #2.
Log #5 will rest on back of log #1 (ember bed). See Figure 23
and 26.
6. Place log #6 onto two pins on log #1 (ember bed) and rest
back of log #6 on back log #4 (see Figure 26).
Figure 23 - Installing Log #1 (Ember Bed) (Model VRL30NR
Shown)
Figure 24 - Installing Log #2 (Right) and Log #3 (Left)
(Model VRL30NR Shown)
Figure 25 - Installing Log #4 (Model VRL30NR Shown)
Figure26-InstallingLog#5andLog#6(ModelVRL30NRShown)
INSTALLATION
Installing Logs (Cont.)
Log #6
Log #5
Log #2
Log #4
Log #3
Log #1
Log #2
Log #3
Log #1
Log #4
Log #2
Log #3
Log #1
Log #1
Log #5 will seat in
this location.

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
17
17
INSTALLATION
Continued
Figure 27 - Attaching Grate to Base Assembly (Logs and Base
Will Vary According to Model)
Grate Slots in Base
ATTACHING GRATE TO BASE ASSEMBLY
Locatethetwoslotsinthefrontofthebaseassembly.Carefullyslide
the decorative grate into these slots (see Figure 27).
OPERATING HEATER
WARNING:Ifyoudonotfollowtheseinstructions
exactly, a fire or explosion may result causing prop-
erty damage, personal injury or loss of life.
A. This appliance has a pilot which must be lighted by hand.
When lighting the pilot, follow these instructions exactly.
B. BEFORE LIGHTING smell all around the appliance area
for gas. Be sure to smell next to the floor because some gas
is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any phone in
your building.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire de-
partment.
C. Useonlyyourhand topush in or turnthe gas controlknob.
Never use tools. If the knob will not push in or turn by
hand, don’t try to repair it, call a qualified service techni-
cian or gas supplier. Force or attempted repair may result
in a fire or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect
the appliance and to replace any part of the control system
and any gas control which has been under water.
FOR YOUR SAFETY READ
BEFORE LIGHTING
WARNING:
•If fireplace has glass doors, never operate this
heater with glass doors closed. If you operate
heater with doors closed, heat buildup inside fire-
place will cause glass to burst. Also if fireplace
opening has vents at the bottom, you must open
the vents before operating heater.
•Youmustoperatethisheaterwithafireplacescreen
in place. Make sure fireplace screen is closed
before running heater.
NOTICE:Duringinitialoperationofnewheater,burn-
ing logs will give off a paper-burning smell. Orange
flamewillalsobepresent.Opendamperorwindowto
vent smell. This will only last a few hours.
INSTALLATION
Attaching Grate To Base Assembly
OPERATING HEATER (THERMOSTAT-CONTROLLED MODELS)
For Your Safety Read Before Lighting
Lighting Instructions
ADDING LAVA ROCK
Placelavarockaroundbaseofheaterifdesired.Besurenottocover
the control knobs or air inlet openings on the front of heater.
THERMOSTAT-CONTROLLED MODELS
LIGHTING
INSTRUCTIONS

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
18
1. Followsteps 1through5underLightingInstructions,page18.
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.
THERMOSTAT CONTROL
OPERATION
The thermostat control knob can be set to any comfort level
between HI and LO. The thermostat willgradually modulate the
heat output and flame height from higher to lower settings, or
pilot, in order to maintain the comfort level you select. The ideal
comfortsettingwillvarybyhouseholddependingupontheamount
ofspacetobeheated,theoutputofthecentralheatingsystem,etc.
Note: SelectingtheHIsettingwiththecontrolknobwillcausethe
burnertoremainfullyon,withoutmodulatingdowninmostcases.
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 times you will desire the full
flames of the HI heat setting but will find the heat output
excessive. You can open the chimney damper (if you have one)
fully or partially to release some of the heat.
WARNING:Damperhandlewillbehotifheaterhas
been running.
1. STOP! Read the safety information on page 17, column 2.
2. Make sure equipment shutoff valve is fully open.
3. Turn control knob clockwise
Clockwise
to the OFF position.
4. Wait five (5) minutes to clear out any gas. Then smell for
gas, including near the floor. If you smell gas, STOP! Fol-
low “B” in the safety information, page 17, column 2. If
you don’t smell gas, go to the next step.
5. Turn control knob counterclockwise to the PILOT
position. Press in control knob for five (5) seconds (see
Figure 28).
Note: You may be running this heater for the first time
after hooking up to gas supply. If so, the control knob may
need to be pressed in for 30 seconds or more. This will al-
low air to bleed from the gas system.
6. Withthermostatcontrol knob pressedin, pressand release
ignitor button.This will light pilot. The pilot is attached to
the front burner. If needed, keep pressing ignitor button
until pilot lights.
Note: If pilot does not stay lit, contact a qualified service
person or gas supplier for repairs. Until repairs are made,
lightpilot withmatch.Tolight pilotwith match,see Manual
Lighting Procedure.
7. Keep control knob pressed in for 30 seconds after lighting
pilot. After 30 seconds, release control knob.
• If control knob does not pop out when released, contact
a qualified service person or gas supplier for repairs.
Note: If pilotgoes out,repeatsteps3 through7.Thisheater
has a safety interlock system. Wait one (1) minute for sys-
tem to reset before lighting pilot again.
8. Turn control knob counterclockwise to desired
heating level. The front burner should light. Set control
knob to any heat level between HI and LO.
9. To light the rear yellow flame burner, push in and turn
rear burner control knob counterclockwise to the
ON position.
OPERATING HEATER
Continued
Figure 28 - Control Knob(s) and Ignitor Button Locations
Models: CSG3924NT, CSG3924PT,
VRL24NT, VRL24PT, VRL30NT and VRL30PT
Ignitor Button Control Knob Rear Burner
Control Knob
Figure 29 - Pilot (Propane/LP)
CAUTION: Do not try to adjust heating levels by
using the equipment shutoff valve.
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. Turncontrolknobclockwise tothePILOTposition.
2. Turn rear burner control knob clockwise to the
OFF position.
OPERATING HEATER (THERMOSTAT-CONTROLLED MODELS)
Lighting Instructions (Cont.)
To Turn Off Gas To Appliance
Thermostat Control
Manual Lighting Procedure
Ignitor Electrode
Pilot Burner Thermocouple
Figure 30 - Pilot (Natural)
Ignitor
Electrode
Pilot Burner
Thermocouple
TO TURN OFF GAS
TO APPLIANCE
MANUAL LIGHTING
PROCEDURE

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
19
19
OPERATING HEATER
Continued
WARNING:Ifyoudonotfollowtheseinstructions
exactly, a fire or explosion may result causing prop-
erty damage, personal injury or loss of life.
A. This appliance has a pilot which must be lighted by hand.
When lighting the pilot, follow these instructions exactly.
B. BEFORE LIGHTING smell all around the appliance area
for gas. Be sure to smell next to the floor because some gas
is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any phone
in your building.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire de-
partment.
C. Useonlyyourhand topush in or turnthe gas controlknob.
Never use tools. If the knob will not push in or turn by
hand, don’t try to repair it, call a qualified service techni-
cian or gas supplier. Force or attempted repair may result
in a fire or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect
the appliance and to replace any part of the control system
and any gas control which has been under water.
FOR YOUR SAFETY
READ BEFORE LIGHTING
1. STOP! Read the safety information in column 1.
2. Make sure equipment shutoff valve is fully open.
3. Set switch in OFF position.
WARNING:
•If fireplace has glass doors, never operate this
heater with glass doors closed. If you operate
heater with doors closed, heat buildup inside
fireplace will cause glass to burst. Make sure
there are no obstructions across opening of
fireplace.
•Youmustoperatethisheaterwithafireplacescreen
in place. Make sure fireplace screen is closed
before running heater.
NOTICE:Duringinitialoperationofnewheater,burning
logswillgiveoffapaper-burningsmell.Opendamperor
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 times you will desire the full
flames of the HI heat setting but will find the heat output
excessive. You can open the chimney damper (if you have one)
fully or partially to release some of the heat.
WARNING: Damper handle will be hot if heater
has been running.
4. Press in and turn control knobs clockwise to the
OFF position.
5. Wait five (5) minutes to clear out any gas. Then smell for
gas, including near the floor. If you smell gas, STOP! Fol-
low “B” in the safety information, column 1. If you don’t
smell gas, go to the next step.
6. Press in and turn control knob counterclockwise
to the PILOT position. Press in control knob for five (5)
seconds (see Figure 31, page 20).
Note: You may be running this heater for the first time
after hooking up to gas supply. If so, the control knob may
need to be pressed in for 30 seconds or more. This will al-
low air to bleed from the gas system.
7. With control knob pressed in, press and release ignitor but-
ton. This will light pilot. The pilot is attached to the front
burner.Ifneeded,keeppressingignitorbuttonuntilpilotlights.
Note: If pilot does not stay lit, contact a qualified service
person or gas supplier for repairs. Until repairs are made,
lightpilot withmatch.Tolight pilotwith match,see Manual
Lighting Procedure, page 20.
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 pilot goes out, repeat steps 4 through 8.
9. Slightly push in and turn control knob counterclockwise
to the ON position.
10. Wait oneminuteand switch selector switch to theON posi-
tion to light burner. Note: AUTO is only functional when
using GWMT1 or GWMS2 optional accessories.
WARNING: Burner will come on automatically
withinoneminutewhentheremoteselectorswitchis
in the ON position after the pilot is lit.
OPERATING HEATER (REMOTE-READY MODELS)
For Your Safety Read Before Lighting
Lighting Instructions
REMOTE-READY MODELS
LIGHTING
INSTRUCTIONS

110021-01G
For more information, visit www.desatech.com
For more information, visit www.desatech.com
20
Figure 34 - Control Knobs, Selector Switch and Ignitor Button
Locations for Hand-Held Remote Operation
Figure 32 - Pilot (Propane/LP)
Ignitor Electrode
Pilot Burner Thermocouple
Figure 33 - Pilot (Natural)
Ignitor
Electrode
Pilot Burner
Thermocouple
Shutting Off Heater
1. Turn control knob clockwise to the OFF position.
2. Turn rear burner control knob clockwise to the
OFF position.
3a. Set selector switch in the OFF position.
3b. IfUsing Optional Hand-Held Remote:Setselectorswitch
in the OFF position to prevent draining battery.
1. Followsteps 1through6underLightingInstructions,page20.
2. Depress control knob and light pilot with match.
3. Keep control knob pressed in for 30 seconds after lighting
pilot.After30seconds,releasecontrolknob. Nowfollowsteps
9 through 11, Lighting Instructions, page 19 and column 1.
CAUTION: Do not try to adjust heating levels by
using the equipment shutoff valve.
WARNING:Makesuretheselectorswitchisinthe
OFF position when you are away from home for long
periods of time. Heater will come on automatically
with selector switch in the ON position.
OPERATING HEATER
Continued
O
F
F
P
I
L
O
T
O
N
AUTO
OFF
ON
Figure31-ControlKnobs and IgnitorButtonLocations(Shown
as Supplied, No Remote Control Operation)
Rear Burner
Control Knob
Selector
Switch Ignitor Button
Control Knob
OPERATING HEATER (REMOTE-READY MODELS)
Lighting Instructions (Cont.)
To Turn Off Gas To Appliance
Manual Lighting Procedure
Optional Remote Operation
TO TURN OFF GAS
TO APPLIANCE
MANUAL LIGHTING
PROCEDURE
OPTIONAL HAND-HELD
REMOTE OPERATION
NOTICE: You must light the pilot before using the
hand-held remote control unit. See Lighting Instruc-
tions, page 19.
1. After lighting, let pilot flame burn for about one minute.
Turn control knob to ON position.Adjust flame adjustment
knobanywherebetweenHI andLO.Slidetheselectorswitch
to the REMOTE position (see Figure 34). Note: The burner
may light if hand-held remote was on when selector switch
was last turned off.You can now turn the burner on and off
with the hand-held remote control unit.
IMPORTANT: Do not leave the selector switch in the RE-
MOTE or ON position when the pilot is not lit. This will
drain the battery.
O
F
F
P
I
L
O
T
O
N
AUTO
OFF
ON
Rear Burner
Control Knob
Selector
Switch Ignitor Button
Control Knob
11. Tolightthe front/rearburners,pushinand turnrearburner
control knob counterclockwise to the ON position. Shutting Off Burners Only (pilot stays lit)
Youmayshutofftheburners andkeepthepilotlit bydoingone
of the following:
1. Turncontrolknobclockwise tothe PILOTposition.
2. Turn rear burner control knob clockwise to the
OFF position.
3. Use remote control manual OFF button.
4. Set selector switch in the OFF position.
Note: All remote control accessories must be purchased sepa-
rately (see Accessories, pages 38 and 39). Follow instructions
included with the remote control.