UNVENTED (VENT-FREE) GAS LOG HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
For more information, visit www.desatech.com
VF- 2 4 N-EMU
VF- 2 4 P-EMU
VF- 1 8 N-EMU
VF- 1 8 P-EMU
ANSI Z21.11.2-2002
Approved
Design Dynamics Vent-free Models Also Design-Certified As Vented Decorative Appliances
Certified
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.
WARNING: Improper installation, adjustment, alteration, service, or maintenance
can cause injury or property damage. Refer
to this manual for correct installation and
operational procedures. For assistance
or additional information consult a qualified installer, service agency, or the gas
supplier.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Immediately call your gas supplier from
a neighbor’s phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call
the fire department.
— Installation and service must be performed
by a qualified installer, service agency, or
the gas supplier.
WARNING: This appliance is for installation only in a solid-fuel burning masonry
or UL127 factory-built fireplace, or in an
approved ventless firebox. It is designcertified for these installations in accordance with ANSI Z21.11.2. Exception: Do
not install this appliance in a factory-built
fireplace that includes instructions stating
it has not been tested or should not be
used with unvented gas logs.
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 4 of this manual.
This appliance may be installed in an aftermarket,* 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.
Warning: This product must be installed by a Licensed Plumber or Gas Fitter when installed
within The Commonwealth of Massachusetts.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
Save this manual for future reference.
TABLE OF CONTENTS
2
SAFETY INFORMATION
TABLE OF CONTENTS
SAFETY INFORMATION ..............................................................2
PRODUCT IDENTIFICATION .......................................................3
OPTIONAL REMOTE CONTROL ACCESSORIES ......................4
LOCAL CODES ............................................................................ 4
UNPACKING .................................................................................4
PRODUCT FEATURES ................................................................4
AIR FOR COMBUSTION AND VENTILATION ............................. 4
INSTALLATION ............................................................................. 7
OPERATING HEATER ................................................................14
INSPECTING BURNERS ........................................................... 17
CLEANING AND MAINTENANCE .............................................18
TROUBLESHOOTING ................................................................19
SPECIFICATIONS ......................................................................22
WIRING DIAGRAM ...................................................................23
SERVICE HINTS ........................................................................ 23
TECHNICAL SERVICE ...............................................................23
REPLACEMENT PARTS ............................................................23
ILLUSTRATED PARTS BREAKDOWN AND PARTS LIST .........24
ACCESSORIES ..........................................................................27
WARRANTY INFORMATION ...................................... Back Cover
SAFETY INFORMATION
WARNINGS
IMPORTANT: Read this owner’s manual carefully and
completely before trying to assemble, operate, or service this heater. Improper use of this heater can cause
serious injury or death from burns, fire, explosion, electrical shock, and carbon monoxide poisoning.
DANGER: Carbon monoxide poisoning may lead
to death!
Carbon Monoxide Poisoning: Early signs of carbon monoxide
poisoning resemble the 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 helps
you detect a gas leak. However, the odor added to the gas can fade.
Gas may be present even though no odor exists.
Make certain you read and understand all warnings. Keep this
manual for reference. It is your guide to safe and proper operation
of this heater.
WARNING: Any change to this heater or its controls
can be dangerous.
WARNING: Do not use a blower insert, heat exchanger insert, or other accessory not approved for
use with this heater.
WARNING: Do not allow fans to blow directly
into the fireplace. Avoid any drafts that alter burner
flame patterns. Ceiling fans can create drafts that
alter burner flame patterns. Altered burner patterns
can cause sooting.
Due to high temperatures, the appliance should be
located out of traffic and away from furniture and
draperies.
Do not place clothing or other flammable material
on or near the appliance. Never place any objects
on the heater.
Heater base assembly becomes very hot when running heater. Keep children and adults away from hot
surface to avoid burns or clothing ignition. Heater will
remain hot for a time after shutdown. Allow surface
to cool before touching.
Carefully supervise young children when they are
in the room with heater. When using the hand-held
remote accessory (Remote-Ready Models Only), keep
selector switch in the OFF position to prevent children
from turning on burners with remote.
You must operate this heater with a fireplace screen
in place. Make sure fireplace screen is closed before
running heater.
Keep the appliance area clear and free from combustible materials, gasoline, and other flammable
vapors and liquids.
WARNING: Do not place log scraps or lava rocks
on burner.
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111826-05
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 (propane/LP units
only).
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 depart-
ment
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 10.
5. Before installing in a solid fuel burning fireplace, the chimney flue and firebox must be cleaned of soot, creosote, ashes
and loose paint by a qualified chimney cleaner. Creosote will
ignite if highly heated. Inspect chimney flue for damage.
If damaged, repair flue damper before operating heater.
6. 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. Also if
fireplace opening has vents at the bottom, you must open the
vents before operating heater.
7. To prevent the creation of soot, follow the instructions in Clean-
ing and Maintenance, page 18.
8. Before using furniture polish, wax, carpet cleaner, or similar
products, turn heater off. If heated, the vapors from these products may create a white powder residue within burner box or
on adjacent walls and furniture.
9. 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 4 through 6. If heater keeps shutting off, see Trouble-
shooting, pages 19 through 21.
10. Do not run heater
• where flammable liquids or vapors are used or stored
• under dusty conditions
11. Do not use this heater to cook food or burn paper or other objects.
12. Do not use heater if any part has been exposed to or under water.
Immediately call a qualified service technician to inspect the
room heater and to replace any part of the control system and
any gas control which has been under water.
13. Do not operate heater if any log is broken. Do not operate heater
if a log is chipped (dime-sized or larger).
SAFETY INFORMATION
PRODUCT IDENTIFICATION
3
3
14. Turn heater off and let cool before servicing, installing, or
repairing. Make sure the selector switch is in the OFF position
(Remote-Ready Models Only). Only a qualified service person
should install, service, or repair heater.
15. 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).
16. Remote-Ready heaters do not to be connected to any external
electrical source.
17. Operating heater above elevations of 4,500 feet may cause pilot
outage.
18. To prevent performance problems, do not use propane/LP fuel
tank of less than 100 lb. capacity (propane/LP units only).
19. Provide adequate clearances around air openings.
PRODUCT IDENTIFICATION
Log Set
Lava Rock
Piezo
Ignitor
Remote
Control
Control Knobs
Figure 1 - Product Identification
Remote
Reciever
Chassis Assembly
REMOTE CONTROLLED MODELS
Log Scraps
111826-05
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OPTIONAL REMOTE CONTROL ACCESSORIES
4
LOCAL CODES
UNPACKING
PRODUCT FEATURES
AIR FOR COMBUSTION AND VENTILATION
Providing Adequate Ventilation
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 27.
The wall thermostat or hand-held thermostat may not be used where
vented decorative listing is required.
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.
UNPACKING
CAUTION: Do not remove the data plates from the
grate assembly. The data plates contain important
warranty and safety information.
1. Remove log set assembly from carton. Note: Do not pick up
assembly by logs. This could damage the unit. Always handle
assembly by grate.
2. Remove control cover floor media components.
3. Remove all protective packaging applied to log set for shipment.
4. Check all items for any shipping damage. If damaged, promptly
inform dealer where you bought heater.
PRODUCT FEATURES
OPERATION
This heater is clean burning. It requires no outside venting. There is
no heat loss out a vent or up a chimney. Heat is generated by both
realistic flames and glowing coals. This heater is designed for 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 (Non-Thermostat 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 ventfree 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.
AIR FOR COMBUSTION AND
VENTILATION
WARNING: This heater shall not be installed in a
confined space or unusually tight construction unless provisions are provided for adequate combustion
and ventilation air. Read the following instructions to
insure proper fresh air for this and other fuel-burning
appliances in your home.
Today’s homes are built more energy efficient than ever. New materials,
increased insulation, and new construction methods help reduce heat
loss in homes. Home owners weather strip and caulk around windows
and doors to keep the cold air out and the warm air in. During heating
months, home owners want their homes as airtight as possible.
While it is good to make your home energy efficient, your home
needs to breathe. Fresh air must enter your home. All fuel-burning
appliances need fresh air for proper combustion and ventilation.
Exhaust fans, fireplaces, clothes dryers, and fuel burning appliances
draw air from the house to operate. You must provide adequate fresh
air for these appliances. This will insure proper venting of vented
fuel-burning appliances.
PROVIDING ADEQUATE VENTILATION
The following are excerpts from National Fuel Gas Code, ANSI
Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation.
All spaces in homes fall into one of the three 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 windows may provide enough
fresh air for combustion and ventilation. However, in buildings of unusually tight construction, you must provide additional fresh air.
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111826-05
AIR FOR COMBUSTION AND VENTILATION
Providing Adequate Ventilation (Cont.)
Determining Fresh-Air Flow for Heater Location
5
5
AIR FOR COMBUSTION AND
VENTILATION
Continued
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
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
plates and floors, between wall-ceiling joints, between
wall panels, at penetrations for plumbing, electrical,
and gas lines, and at other openings.
If your home meets all of the three criteria above, you
must provide additional fresh air. See Ventilation Air
From Outdoors, page 6.
If your home does not meet all of the three criteria above,
proceed to Determining Fresh-Air Flow For Heater Lo-
cation, below.
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 m3 per kw) of the aggregate input rating
of all appliances installed in that space and an unconfined space as
a space whose volume is not less than 50 cubic feet per 1,000 Btu
per hour (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with
the space in which the appliances are installed*, through openings
not furnished with doors, are considered a part of the unconfined
space.
* Adjoining rooms are communicating only if there are doorless
passageways or ventilation grills between them.
DETERMINING FRESH-AIR FLOW FOR
HEATER LOCATION
Determining if You Have a Confined or Unconfined
Space
Use this work sheet to determine if you have a confined or unconfined
space.
Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways or ventilation grills between
the rooms.
1. Determine the volume of the space (length x width x height).
Length x Width x Height = ____________cu. ft. (volume of space)
Example: Space size 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling
height) = 2560 cu. ft. (volume of space)
-11
kg per pa-sec-m2) or less with
If additional ventilation to adjoining room is supplied with grills or 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)
73,000 Btu/Hr (actual amount of Btu/Hr used)
The space in the above example is a confined space because the actual
Btu/Hr used is more than the maximum Btu/Hr the space can support. 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 adjoining 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 uncon-
fined.
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
33,000
73,000
WARNING: If the area in which the heater may be
operated is smaller than that defined as an unconfined
space or if the building is of unusually tight construction, provide adequate combustion and ventilation
air by one of the methods described in the National
Fuel Gas Code, ANSI Z223.1/NFPA 54 Section 5.3 or
applicable local codes.
111826-05
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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"
AIR FOR COMBUSTION AND VENTILATION
Ventilation Air
6
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
Provide extra fresh air by using ventilation grills or ducts. You
must provide two permanent openings: one within 12" of the ceiling and one within 12" of the floor. Connect these items directly to
the outdoors or spaces open to the outdoors. These spaces include
attics and crawl spaces. Follow the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation
for required size of ventilation grills or ducts.
IMPORTANT: Do not provide openings for inlet or outlet air into
attic if attic has a thermostat-controlled power vent. Heated air
entering the attic will activate the power vent.
Figure 2 - Ventilation Air from Inside Building
Figure 3 - Ventilation Air from Outdoors
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111826-05
INSTALLATION
INSTALLATION
Check Gas Type
Installation and Clearances for Vent-Free Operation
7
7
NOTICE: This heater is intended for use as supplemental heat. Use this heater along with your primary
heating system. Do not install this heater as your 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 throughout the
house. In the event of a power outage, you can use
this heater as your primary heat source.
WARNING: A qualified service person must install
heater. Follow all local codes.
NOTICE: State or local codes may only allow operation
of this appliance in a vented configuration. Check
your state or local codes.
WARNING: Make sure the selector switch is in the
OFF position before installing heater.
WARNING: Before installing in a solid fuel burning fireplace, the chimney flue and firebox must be
cleaned of soot, creosote, ashes and loose paint by
a qualified chimney cleaner. Creosote will ignite if
highly heated. A dirty chimney flue may create and
distribute soot within the house. Inspect chimney flue
for damage. If damaged, repair flue damper before
operating heater.
WARNING: Seal any fresh air vents or ash cleanout doors located on floor or wall of fireplace. If not,
drafting may cause pilot outage or sooting. Use a heatresistant sealant. Do not seal chimney flue damper.
WARNING: Never install the heater
• in a bedroom or bathroom unless installed as a
vented appliance, see page 10
• 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 heater
• 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 coverings or operating heater where impurities (such as,
but not limited to, tobacco smoke, aromatic candles,
cleaning fluids, oil or kerosene lamps, etc.) in the air
exist, may discolor walls or cause odors.
IMPORTANT: Vent-free heaters add moisture to the air. Although
this is beneficial, installing heater in rooms without enough ventilation air may cause mildew to form from too much moisture. See
Air for Combustion and Ventilation, pages 4 through 6.
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.
INSTALLATION AND CLEARANCES FOR
VENT-FREE OPERATION
WARNING: Maintain the minimum clearances. If
you can, provide greater clearances from floor, ceiling, and adjoining wall.
MINIMUM FIREPLACE
CLEARANCE TO
COMBUSTIBLE MATERIALS
Log Size 18", 24"
Side Wall 16"
Ceiling 42"
Floor 5"
LOG SIZING REQUIREMENTS
Minimum Firebox Size
Log Front Rear*
Size Height Depth Width Width
18" 17" 14" 24" 20"
24" 17" 14" 28" 22"
111826-05
*Measured at 14" depth
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Heat Resistant
Material
(A)
INSTALLATION
8
Installation and Clearances for Vent-Free Operation (Cont.)
INSTALLATION
Continued
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: When installing your gas logs into a manufactured fire-
box, follow firebox manufacturer’s instructions for minimum
clearances to combustible materials.
B. Clearances from the top of the fireplace opening to the ceiling
should not be less than 42 inches.
Example
*
*Minimum 16 inches from Side Wall
Figure 4 - Minimum Clearance for Combustible to Wall
noncombustible material behind it. Noncombustible material must
extend at least 8" up (for all models). 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.
If Using Mantel
You must have noncombustible material(s) above the fireplace
opening. Noncombustible materials (such as slate, marble, tile,
etc.) must be at least 1/2 inch thick. With sheet metal, you must
have noncombustible material behind it. Noncombustible material
must extend at least 8 inches up (for all models). If noncombustible material is less than 12", you must install the fireplace hood
accessory (24" 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 Figure 5 and Figures 6 and 7,
page 9, 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.
Noncombustible Requirements for
Material Distance (A) Safe Installation
12" or more Noncombustible material OK.
Between 8" and 12" 24" Models: Install fireplace hood ac-
cessory (GA6060, see Accessories,
page 27).
18" Model: Noncombustible mate-
rial OK.
Less than 8" Noncombustible material must be ex-
tended to at least 8". See Between 8"
and 12", above. If you cannot extend
material, you must operate heater
with flue damper open.
NOTICE: Non thermostat controlled heaters maybe used
as a vented product. If so, you must always run heater
with chimney flue damper open. If running heater with
damper open, noncombustible material above fireplace
opening is not needed. Go to Installing Damper Clamp Ac-
cessory for Vented Operataion, page 10.
Minimum Noncombustible Material Clearances
If Not Using Mantel
Note: If using a mantel proceed to If Using Mantel. If not using a
mantel, follow the information on this page.
You must have noncombustible material(s) above the fireplace opening. Noncombustible materials (such as slate, marble, tile, etc.)
must be at least 1/2 inch thick. With sheet metal, you must have
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Figure 5 - Heat Resistant Material (Slate, Marble, Tile, etc.)
Above Fireplace
111826-05
INSTALLATION
14"
Min.
Combustible
Material
Non-Combustible
Material
Hearth
5"
Min.
Combustible
Material
Minimum NonCombustible
Material
Minimum NonCombustible
Material Height
Distances to
Underside of
Mantel
Top of Fireplace
Opening
Underside of
Mantel Shelf
12"
8"
(A)
18"
14"
20"
17"
22"
19"
24"
20"
All minimum
distances are
in inches
Log Set
24" Models
18" Model
2
1
/2
"
6"
8"
10"
Mantel Shelf
Minimum NonCombustible
Material
Hood
(GA6050,GA6052,
or GA6052)
Distances to
Underside of
Mantel
Top of Fireplace
Opening
Underside of
Mantel Shelf
8"
Min.
12"
15"
20"
All minimum
distances are
in inches
Log Set
18"-24" Models
2
1
/2
"
6"
8"
10"
Mantel Shelf
12"
18"
Continued
MANTEL CLEARANCES
In addition to meeting noncombustible material clearances, you must also
meet required clearances between fireplace opening and mantel shelf. If
you do not meet the clearances listed below, you will need a hood.
Determining Minimum Mantel Clearance
If you meet minimum clearance between mantel shelf and top of
fireplace opening, a hood is not required (see Figure 6).
Determining Minimum Mantel Clearance When
Using a Hood
If minimum clearances in Figure 6 are not met, you must have
a hood. When using a hood there are still certain minimum
mantel clearances required. Follow minimum clearances shown
in Figure 7 when using hood.
NOTICE: Surface temperatures of adjacent walls and
mantels become hot during operation. Walls and mantels above the firebox may become hot to the touch.
If installed properly, these temperatures meet the requirement of the national product standard. Follow all
minimum clearances shown in this manual.
INSTALLATION
Mantel Clearances
9
9
Floor Clearances
Figure 6 - Minimum Mantel Clearances Without Using Hood
NOTICE: If your installation does not meet the minimum 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 flooring
(see Figure 9).
For more information, visit www.desatech.com
111826-05
Figure 7 - Minimum Mantel Clearances When Using Hood
Figure 8 - Minimum Fireplace
Clearances If Installed at Floor
Level
Figure 9 - Minimum Fireplace
Clearances Above
Combustible Flooring
INSTALLATION
10
Installing Damper Clamp Accessory for Vented Operation
Installing Heater Assembly
INSTALLATION
Continued
INSTALLING DAMPER CLAMP ACCESSORY
FOR VENTED OPERATION
Note: When used as a vented decorative, 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 non-thermostatically-controlled model, 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
requirements 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 (to order, see Accessories, page 27). 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 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
INSTALLING HEATER ASSEMBLY
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 assembly by
logs. This could damage unit. Only handle assembly
by grates.
IMPORTANT: Make sure the heater burners are level. If heater is
not level, heater will not work properly.
Installation Items Needed
• control cover kit (provided with heater)
• approved flexible gas hose and fittings (provided with heater)
(if allowed by local codes)
• sealant (resistant to propane/LP gas, not provided)
Note: Install optional GHRCTA Receiver and Hand-Held Remote
Control Kit (see Accessories, page 27) before installing gas log
heater (Remote-Ready Models Only). See installation instructions
included with the kit.
1. Apply pipe joint sealant lightly to male threads of gas fitting
(not provided). Connect approved flexible gas hose to inlet side
of gas control (see Figure 11).
2. Position heater assembly in fireplace.
3. Connect to gas supply. See Connecting To Gas Supply, (see
Figure 12, page 11).
Gas Control
Damper Clamp
Damper
Masonry Fireplace
Figure 10 - Attaching Damper Clamp
Manufactured Fireplace
Damper
Damper Clamp
Damper
Figure 11 - Attaching Flexible Gas Hose to Heater Gas
Regulator
Flexible Gas
Hose (if allowed
by local codes)
For more information, visit www.desatech.com
111826-05
INSTALLATION
Continued
WARNING: This appliance requires a 3/8" NPT
(National Pipe Thread) inlet connection to the pressure regulator.
WARNING: A qualified service person must connect heater to gas supply. Follow all local codes.
CAUTION: Never connect propane/LP fireplace
directly to the propane/LP supply. This heater requires
an external regulator (not supplied). Install the external regulator between the heater and propane/LP
supply.
WARNING: Never connect natural gas fireplace to
private (non-utility) gas wells. This gas is commonly
known as wellhead gas.
Installation Items Needed
Before installing heater, make sure you have the items listed below.
• external regulator (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
• approved flexible gas line with gas connector (if allowed by local
codes) (provided)
* 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 27.
For propane/LP units, the installer must supply an external regulator. The external regulator will reduce incoming gas pressure. You
must reduce incoming gas pressure to between 11 and 14 inches of
water. If you do not reduce incoming gas pressure, heater regulator
damage could occur. Install external regulator with the vent pointing down as shown in Figure 12. Pointing the vent down protects
it from freezing rain or sleet.
Installing Heater Assembly (Cont.)
INSTALLATION
Connecting to Gas Supply
11
11
CONNECTING TO GAS SUPPLY
Installation must include an equipment shutoff valve, union, and
plugged 1/8" NPT tap. Locate NPT tap within reach for test gauge
hook up. NPT tap must be upstream from heater (see Figure 13
page 12, 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.
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.
We recommend that you install a sediment trap in supply line as
shown in Figure 13 page 12, depending on your model. Locate
sediment trap where it is within reach for cleaning. Install in piping system between fuel supply and heater. Locate sediment trap
where trapped matter is not likely to freeze. A sediment trap traps
moisture and contaminants. This keeps them from going into heater
controls. If sediment trap is not installed or is installed wrong, heater
may not run properly.
CAUTION: Avoid damage to gas control. Hold gas
control with wrench when connecting it to gas piping
and/or fittings.
External Regulator
Propane/LP
Supply Tank
Vent Pointing Down
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"
diameter or greater to allow proper gas volume to
heater. If pipe is too small, undue loss of volume will
occur.
For more information, visit www.desatech.com
111826-05
Figure 12 - External Regulator With Vent Pointing Down
12
ON
POSITION
OFF
POSITION
INSTALLATION
Connecting To Gas Supply (Cont.)
Checking Gas Connections
INSTALLATION
Continued
CSA Design-Certified Equipment
Shutoff Valve With 1/8" NPT Tap*
Approved Flexible
Gas Hose (if allowed
by local codes)
3" Minimum
Gas Control
Pipe Cap Tee
Nipple Joint
Sediment Trap
Figure 13 - Gas Connection (Remote-Ready Models Only)
* Purchase the optional CSA design-certified equipment shutoff valve
from your dealer. See Accessories, page 27.
**Minimum inlet pressure for purpose of input adjustment.
WARNING: Test all gas piping and connections
for leaks after installing or servicing. Correct all leaks
at once.
WARNING: Never use an open flame to check for
a leak. Apply a noncorrosive leak detection fluid to
all joints. Bubbles forming show a leak. Correct all
leaks at once.
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)
CHECKING GAS CONNECTIONS
2. Cap off open end of gas pipe where equipment shutoff valve
was connected.
3. Pressurize supply piping system by either opening propane/LP
supply tank valve for propane/LP gas or opening main gas valve
located on or near gas meter for natural gas, or using compressed
air.
4. Check all joints of gas supply piping system. Apply 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 14).
2. Pressurize supply piping system by either opening propane/LP
supply tank valve for propane/LP gas or opening main gas valve
located on or near gas meter for natural gas, or using compressed
air.
3. Check all joints from gas meter to equipment shutoff valve for
natural gas or propane/LP supply to equipment shutoff valve for
propane/LP (see Figure 15, page 13). Apply noncorrosive leak
detection fluid to all joints. Bubbles forming show a leak.
4. Correct all leaks at once.
Pressure Testing Heater Gas Connections
1. Open equipment shutoff valve (see Figure 14).
2. Open main gas valve located on or near gas meter for natural
gas or open propane/LP supply tank valve.
3. Make sure control knob of heater is in the OFF position.
4. Check all joints from equipment shutoff valve to gas control
(see Figures 15 and 16 page 13). Apply noncorrosive leak
detection fluid to all 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.
CAUTION: Make sure external regulator has been
installed between propane/LP supply and heater.
See guidelines under Connecting to Gas Supply,
page 11.
Pressure Testing gas Supply Piping system
Test Pressures In Excess Of 1/2 PSIG (3.5 kPa)
1. Disconnect appliance with its appliance main gas valve (control
valve) and equipment shutoff valve from gas supply piping
system. Pressures in excess of 1/2 psig will damage heater
regulator.
For more information, visit www.desatech.com
Equipment
Shutoff
Valve
Figure 14 - Equipment Shutoff Valve
(OPEN)
(CLOSE)
111826-05
INSTALLATION
Continued
Propane/LP
Supply Tank
Equipment
Shutoff Valve
Thermostat Gas
Valve or Control
Valve Location
Checking Gas Connections (Cont.)
INSTALLATION
13
13
Figure 15 - Checking Gas Joints (propane/LP only)
Thermostat Gas
Valve or Control
Valve Location
Gas Meter
Figure 16 - Checking Gas Joints (Natural Gas Only)
Thermostat Gas
Valve or Control
Valve Location
111826-05
For more information, visit www.desatech.com
14
O
F
F
P
I
L
O
T
O
N
L
O
I
H
AUTO
OFF
ON
Control Knob
Ignitor Button
Flame Adjustment Knob
Selector Switch in
OFF Position
OPERATING HEATER (REMOTE-READY MODELS)
For Your Safety Read Before Lighting
Lighting Instructions
OPERATING HEATER
REMOTE-READY MODELS
FOR YOUR SAFETY READ
BEFORE LIGHTING
WARNING: If you do not follow these instructions
exactly, a fire or explosion may result causing property
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 department.
C. Use only your hand to push in or turn the gas control knob.
Never use tools. If the knob will not push in or turn by hand,
don’t try to repair it, call a 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 under water.
LIGHTING INSTRUCTIONS
NOTICE: During initial operation of new heater, burning logs will give off a paper-burning smell. Orange
flame will also be present. Open damper or window
to vent smell. This will only last a few hours.
Note: Home owners generally prefer to 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.
Figure 17 - Control Knob and Ignitor Button Location,
Manual Controlled
1. STOP! Read the safety information, starting in column 1,
of this page.
2. Make sure equipment shutoff valve is fully open.
3. Set selector switch in the OFF position.
4. Press in and turn control knob clockwise to the
OFF position (see Figure 17).
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. Also if fireplace opening
has vents at the bottom, you must open the vents
before operating heater.
• You must operate this heater with a fireplace screen
in place. Make sure fireplace screen is closed before
running heater.
For more information, visit www.desatech.com
WARNING: Burners will come on automatically
within one minute when the selector switch is in the
ON position after the pilot is lit.
5. Wait five (5) minutes to clear out any gas. Then smell for
gas, including near the floor. If you smell gas, STOP! Follow
“B” in the safety information, starting in column 1 of this
page. 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 17).
Note: You may be running this heater for the first time after
hooking up to gas supply. If so, the control knob may need
to be pressed in for 30 seconds or more. This will allow air
to bleed from the gas system.
111826-05
OPERATING HEATER
O
F
F
L
O
I
H
AUTO
OFF
ON
Control Knob
Ignitor Button
Flame Adjustment Knob
Selector Switch in
OFF Position
REMOTE OFF ON
Remote O
nOf
f
Fireplac
e
Remot
e
Continued
OPERATING HEATER (REMOTE-READY MODELS)
Lighting Instructions (Cont.)
To Turn Off Gas To Appliance
Manual Lighting Procedure
Remote Control Operation
15
15
7. With control knob pressed in, press and release ignitor button. This will light pilot. The pilot is attached to the front
burner. If needed, keep pressing ignitor button until pilot
lights.
Note: If pilot does not stay lit, contact a qualified service
person or gas supplier for repairs. Until repairs are made,
light pilot with match. To light pilot with match, see Manual
Lighting Procedure, column 2.
Remote Control
Figure 18 - Control Knob and Ignitor Button Location,
Remote Controlled
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, pages
14 & 15.
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 functional when
using GWMT1 or GWMS2 optional accessories.
11. Set flame adjustment knob to any level between HI and
LO.
Pilot
Burner
Ignitor
Electrode
Figure 19 - Pilot (Propane/LP)
Pilot
Burner
Pilot (Natural)
Ignitor
Electrode
TO TURN OFF GAS TO APPLIANCE
Shutting Off Heater
1. Turn control knob clockwise to the OFF position.
2a. Set selector switch in the OFF position.
2b. If Using Optional Hand-Held Remote: Set selector switch
in the OFF position to prevent draining battery.
Shutting Off Burner Only (pilot stays lit)
You may shut off the burners and keep the pilot lit by doing
one of the following:
1. Turn control knob clockwise to the PILOT position.
2. Use remote control manual OFF button.
3. Set selector switch in the OFF position.
MANUAL LIGHTING PROCEDURE
1. Follow steps 1 through 6 under
Lighting Instructions
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 11,
Lighting Instructions
, column 1.
, page
REMOTE CONTROL OPERATION
Remote Control Operation
CAUTION: Do not try to adjust heating levels by
using the equipment shutoff valve.
WARNING: Make sure the selector switch is in the
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.
For more information, visit www.desatech.com
111826-05
1. After lighting, let pilot flame burn for about one minute.
Turn control knob to ON position. Adjust flame adjustment
knob anywhere between HI and LO. Slide the selector
The burners may
switch to the REMOTE position.
Note:
light if hand-held remote ON button was on when selector
switch was last turned off. You can now turn the burners
on and off with the hand-held remote control unit.
OPERATING HEATER (REMOTE-READY MODELS)
O
F
F
L
O
I
H
AUTO
OFF
ON
Control Knob
Ignitor Button
Flame Adjustment Knob
Selector Switch in
OFF Position
REMOTE OFF ON
Remote OnOff
Fireplace
Remot
e
16
Remote Control Operation (Cont.)
OPERATING HEATER
Continued
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.
2. Press the ON/OFF button to turn the burners on and off.
When turning burners off, the pilot will remain lit.
IMPORTANT: Be sure to press the ON/OFF buttons on the
hand-held remote control unit for up to 3 seconds to assure
proper operation.
Selector Toggle Switch
(Optional Remote Control)
Figure 20 - Setting the Selector switch, Control Knob, and Flame
Adjustment Knob for Remote Operation
For more information, visit www.desatech.com
111826-05
INSPECTING BURNERS
Check pilot flame pattern and burner flame patterns often.
PILOT FLAME PATTERN
Figure 22 shows a correct pilot flame pattern. Figure 23 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 23
• turn heater off (see To Turn Off Gas to Appliance, page 15 (Re-
mote-Ready Models])
• see Troubleshooting, pages 19 through 21
Note: The pilot flame on natural gas units will have a slight curve,
but flame should be blue and have no yellow or orange color.
INSPECTING BURNERS
Pilot Flame Pattern
Burner Flame Pattern
17
17
BURNER FLAME PATTERN
Figure 24 shows correct burner flame pattern.
NOTICE: Do not mistake orange flames with yellow
tipping. Dirt or other fine particles are burned by heater,
causing brief patches of orange flame.
If burner flame pattern is incorrect, as shown in Figure 25
• turn heater off (see To Turn Off Gas to Appliance, page 15)
• see Troubleshooting, pages 19 through 21
Pilot Burner
Thermocouple
Figure 22 - Correct Pilot Flame Pattern (Your pilot may vary
from pilots shown)
Pilot Burner
Thermocouple
Figure 23 - Incorrect Pilot Flame Pattern (Your pilot may vary
from pilots shown)
Pilot Burner
Thermocouple
Pilot Burner
Thermocouple
Figure 24 - Correct Burner Flame Pattern
Yellow Tipping At Top
of Blue Flame
Figure 25 - Incorrect Burner Flame Pattern
111826-05
For more information, visit www.desatech.com
CLEANING AND MAINTENANCE
Cleaning Burner Injector Holder and Pilot Air Inlet Hole
18
CLEANING AND MAINTENANCE
if compressed air is not available.
WARNING: Turn off heater and let cool before
cleaning.
CAUTION: You must keep control areas, burners,
and circulating air passageways of heater clean. Inspect these areas of heater before each use. Have
heater inspected yearly by a qualified service person. Heater may need more frequent cleaning due
to excessive lint from carpeting, pet hair, bedding
material, etc.
CLEANING BURNER INJECTOR HOLDER
AND PILOT AIR INLET HOLE
The primary air inlet opening allow the proper amount of air to mix
with the gas. This provides a clean burning flame. Keep these holes
clear of dust, dirt, lint, and pet hair. Clean these air inlet opening
prior to each heating season. Blocked air opening will create soot.
We recommend that you clean the unit every three months during
operation and have heater inspected yearly by a qualified service
person.
We also recommend that you keep the burner tube and pilot assembly
clean and free of dust and dirt. To clean these parts we recommend
using compressed air no greater than 30 PSI. Your local computer
store, hardware store, or home center may carry compressed air in
a can. You can use a vacuum cleaner in the blow position. If using
compressed air in a can, please follow the directions on the can.
If you don't follow directions on the can, you could damage the
pilot assembly.
1. Shut off the unit, including the pilot. Allow the unit to cool for
at least thirty minutes.
2. Inspect burner, pilot, and primary air inlet opening on injector
holder for dust and dirt (see Figure 26a and 26b).
3. Blow air through the ports/slots and holes in the burner.
4. Check the injector holder located at the end of the burner tube
again. Remove any large particles of dust, dirt, lint, or pet hair
with a soft cloth or vacuum cleaner nozzle.
5. Blow air into the primary air opening 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 27). With the unit off, lightly blow air
through the air inlet hole. You may blow through a drinking straw
LOGS
• If you remove logs for cleaning, refer to
Installing Logs
14, to properly replace logs.
Injector
Holder
Burner
Tube
Injector
Primary Air
Inlet Opening
Figure 26a - Injector Holder Front Burner Tube
Pilot Air
Inlet Hole
Pilot Assembly
Pilot Air Inlet Hole
Pilot Air Inlet Hole
Pilot Assembly
Pilot Assembly
Figure 27 - Pilot Inlet Air Hole (Your pilot may vary from pilots
shown)
, page
Primary Air
Inlet Opening
For more information, visit www.desatech.com
111826-05
TROUBLESHOOTING
TROUBLESHOOTING
19
19
No te: For a dditional hel p, visit
DESA technical service web site at
www.desatech.com.
Note: All troubleshooting items are listed
in order of operation.
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
WARNING: �Turn off and un-
plug heater and let cool before
servicing. Only a qualified service
person should service and repair
heater.
POSSIBLE CAUSE
1. Ignitor electrode not connected to ignitor
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 or
broken
1. Gas supply turned off or equipment
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. Deple t ed gas supply (prop a ne/LP
only)
6. ODS/pilot is clogged
7. Gas regulator setting is not correct
CAUTION: Never use a wire,
needle, or similar object to clean
ODS/pilot. This can damage ODS/
pilot unit.
REMEDY
1. Reconnect ignitor cable
2. Free ignitor cable if pinched by any
metal or tubing. Keep ignitor cable dry
3. Tighten nut holding piezo ignitor to base
panel of log set. Nut is located behind
base panel.
4. Replace ignitor cable
5. Replace piezo ignitor
6. Replace pilot assembly for remote-ready
units; Replace ignitor electrode for variable manually controlled units
1. Turn on gas supply or open equipment
shutoff valve
2. Turn control knob to PILOT position
3. Press in control knob while in PILOT
position
4. Continue holding down control knob.
Repeat igniting operation until air is
removed
5. Contact local propane/LP gas company
6. Clean ODS/pilot (see Cleaning and
Ma intenance , page 18) or replac e
ODS/pilot assembly
7. Replace gas regulator
ODS/pilot lights but flame goes out when
control knob is released
For more information, visit www.desatech.com
111826-05
1. Control knob not fully pressed in
2. Cont rol knob no t pressed in long
enough
3. Safety int e r l ock system has been
triggered
4. Equipment shutoff valve not fully open
5. Pilot flame not touching thermocouple,
which allows thermocouple to cool,
causing pilot flame to go out. This problem could be caused by one or both of
the following:
A) Low gas pressure
B) Dirty or partially clogged ODS/
pilot
6. Thermocouple connection loose at control valve
7. Thermocouple damaged
8. Control valve damaged
1. Press in control knob fully
2. After ODS/pilot lights, keep control
knob pressed in 30 seconds
3. Wait one minute for safety interlock system to reset. Repeat ignition operation
4. Fully open equipment shutoff valve
5. A) Contact local natural or propane/LP
gas company
B) Clean ODS/pilot (see Cleaning and
Maintenance, page 18) or replace ODS/
pilot assembly
6. Hand tighten until snug, then tighten
1/4 turn more
7. Replace pilot assembly
8. Replace control valve
TROUBLESHOOTING
20
TROUBLESHOOTING
Continued
OBSERVED PROBLEM
One or both burner does not light after
ODS/pilot is lit
Delayed ignition of burner
Burner backfiring during combustion
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 (Remote-Ready Models Only)
6. Wire disconnected from gas control
(Remote-Ready Models Only)
1. Manifold pressure is too low
2. Burner orifice(s) clogged
3. Mislocated crossover tube
1. Burner orifice is clogged or damaged
2. Damaged burner
3. Gas regulator defective
REMEDY
1. Contact local natural or propane/LP gas
company
2. Clean burner(s) (see Cleaning and
Maintenance, 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 23
1. Contact local natural or propane/LP gas
company
2. Clean burner(s) (see Cleaning and
Maintenance, page 18) or replace burner
orifice(s)
3. Contact qualified service person
1. Clean burner (see Cleaning and Main-
tenance, page 18) or replace burner
orifice
2. Replace damaged burner
3. Replace gas regulator
Orange flame in burner during burner
combustion
Slight smoke or odor during initial operation
Heater produces a whistling noise when
burners are lit
White powder residue forming within burner
box or on adjacent walls or furniture
Moisture/condensation noticed on windows
1. Not enough air
2. Gas regulator defective
1. Residues from manufacturing processes
and logs curing
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 parti a l ly cl ogged burne r
orifice(s)
1. When heated, vapors from furniture polish, wax, carpet cleaners, etc. turn into
white powder residue
1. Not enough combustion/ventilation air
1. Check burner(s) for dirt and debris. If
found, clean burner(s) (see Cleaning and
Maintenance, page 18)
2. Replace gas regulator
1. Problem will stop after a few hours of
operation
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 local natural or propane/LP gas company
3. Observe minimum installation clearances (see pages 7 through 10)
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. Refer to Air for Combustion and Venti-
lation requirements (page 4)
For more information, visit www.desatech.com
111826-05
TROUBLESHOOTING
Continued
WARNING: If you smell gas
• Shut off gas supply.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your
building.
• Immediately call your gas supplier from a neighbor’s phone. Follow
the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
IMPORTANT: Operating heater where impurities in air exist may create odors. Cleaning
supplies, paint, paint remover, cigarette smoke, cements and glues, new carpet or textiles,
etc., create fumes. These fumes may mix with combustion air and create odors. These
odors will disappear over time.
TROUBLESHOOTING
21
21
OBSERVED PROBLEM
Remote does not function (Remote-Ready
Models Only)
Heater produces a clicking/ticking noise just
after burners are lit or shut off
Heater produces unwanted odors
Heater shuts off in use (ODS operates)
Gas odor even when control knob is in OFF
position
POSSIBLE CAUSE
1. Battery is not installed. Battery power is
low
1. Metal expanding while heating or contracting while cooling
1. Heater burning vapors from paint, hair
spray, glues, cleaners, chemicals, new
carpet, etc. (See IMPORTANT state-
ment above)
2. Low fuel supply (propane/LP only)
3. Gas leak. See Warning statement at
top of page
1. Not enough fresh air is available
2. Low line pressure
3. ODS/pilot is partially clogged
1. Gas leak. See Warning statement at
top of page
2. Control valve or gas control defective
REMEDY
1. Replace 9-volt batteries in receiver and
remote control
1. This is common with most heaters. If noise
is excessive, contact qualified service person
1. Open window to ventilate room. Stop using odor causing products while heater is
running
2. Refill supply tank (propane/LP only)
3. Locate and correct all leaks (see Checking
Gas Connections, page 12)
1. Open window and/or door for ventilation
2. Contact local natural or propane/LP gas
company
3. Clean ODS/pilot (see Cleaning and Main-
tenance, page 18)
1. Locate and correct all leaks (see Checking
Gas Connections, page 12)
2. Replace control valve or gas control
Gas odor during combustion
Log set cycles to pilot, but room temperature
drops to a lower than ideal level before log
set comes back on
For more information, visit www.desatech.com
111826-05
1. Foreign matter between control valve and
burner
2. Gas leak. See Warning statement at
top of page
1. Hand-held remote control is too close to
heater (Remote-Ready Models Only)
1. Take apart gas tubing and remove foreign
matter
2. Locate and correct all leaks (see Checking
Gas Connections, page 12)
1. Move hand-held remote control unit farther
away from the heater
SPECIFICATIONS
22
SPECIFICATIONS
VF-18N-EMU VF-24N-EMU
Btu (Variable) 24,000/36,000 25,000/39,000
Type Gas Natural Gas Only Natural Gas Only
Ignition Piezo Piezo
Manifold Pressure 3.5" W.C. 3.5" W.C.
Inlet Gas Pressure (in. of water)
Maximum 10.5" W.C. 10.5" W.C.
Minimum* 5.0" W.C. 5.0" W.C.
Shipping Weight 32 lbs. 34 lbs.
* For purpose of input adjustment
VF-18P-EMU VF-24P-EMU
Btu (Variable) 24,000/36,000 25,000/39,000
Type Gas Propane/LP Only Propane/LP Only
Ignition Piezo Piezo
Manifold Pressure 10" W.C. 10" W.C. - 3.4" W.C.
Inlet Gas Pressure (in. of water)
Maximum 14" W.C. 14" W.C.
Minimum* 11" W.C. 11" W.C.
Shipping Weight 32 lbs. 34 lbs.
* For purpose of input adjustment
For more information, visit www.desatech.com
111826-05
A
U
T
O
O
F
F
ON
Thermopile
WIRING DIAGRAM (REMOTE-READY MODELS ONLY)
SERVICE HINTS
TECHNICAL SERVICE
REPLACEMENT PARTS
23
23
WIRING DIAGRAM
(Remote-Ready Models Only)
SERVICE HINTS
When Gas Pressure Is Too Low
• pilot will not stay lit
• burners will have delayed ignition
• heater will not produce specified heat
• propane/LP gas supply may be low
You may feel your gas pressure is too low. If so, contact your local
propane/LP or natural gas supplier.
TECHNICAL SERVICE
You may have further questions about installation, operation, or
troubleshooting. If so, contact DESA Technical Service Department
at 1-866-672-6040. When calling please have your model and serial
numbers of your heater ready.
You can also visit DESA technical services web site at
www.desatech.com.
REPLACEMENT PARTS
Note: Use only original replacement parts. This will protect your
warranty coverage for parts replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product. If they can’t supply
original replacement part(s), call DESA Technical Service Department at 1-866-672-6040.
When calling DESA International, have ready
• your name
• your address
• model and serial numbers of your heater
• how heater was malfunctioning
• type of gas used (propane/LP or natural gas)
• purchase date
Usually, we will ask you to return the part to the factory.
PARTS NOT UNDER WARRANTY
Contact authorized dealers of this product. If they can’t supply original replacement part(s), call DESA at 1-866-672-6040 for referral
information.
When calling DESA, have ready
• model number of your heater
• the replacement part number
For more information, visit www.desatech.com
111826-05
ILLUSTRATED PARTS BREAKDOWN
24
VF-18N-EMU, VF-18P-EMU
ILLUSTRATED PARTS
BREAKDOWN
REMOTE-READY MODELS AND
REMOTE CONTROLLED MODELS
VF-18N-EMU
VF-18P-EMU
Log sets and
mounting plates
are ordered as an
assembly
GTA Replacement Part Numbers
Model Number GTA Part number
VF-18N-EMU
REMOTE MODELS ONLY
VF-18P-EMU
For more information, visit www.desatech.com
111794 03
111794 04
111826-05
ILLUSTRATED PARTS
1
4
5
7
8
9
10
14
15
13
12
16
17
18
19
20
21
22
11
6
23
24
25
26
27
28
30
31
29
32
24
BREAKDOWN
REMOTE-READY MODELS AND
REMOTE CONTROLLED MODELS
VF-24N-EMU
VF-24P-EMU
ILLUSTRATED PARTS BREAKDOWN
VF-24N-EMU, VF-24P-EMU
25
25
3 Log sets and
mounting plates
are ordered as an
assembly
GTA Replacement Part Numbers
Model Number GTA Part number
VF-24N-EMU
VF-24N-EMU
111794 01
111794 02
REMOTE MODELS ONLY
For more information, visit www.desatech.com
111826-05
PARTS LIST
VF-24N-PDG, VF-24P-PDG, VF-24N-BTB, VF-24P-BTB,
26
VF-18N-PDG, VF-18P-PDG, VF-18N-BTB, VF-18P-BTB
PARTS LIST
This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Replacement Parts on page 23 of this manual.
KEY
NO.
VF-18N-EMU VF-18P-EMU VF-24N-EMU VF-24P-EMU
1
2
111808-01
see table
page 25
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
111835-01
111803-05
111803-04
111800-01
111817-01
112823-01
111804-04
111819-04
111807-01
111796-01
097159-04
103784-01
103784-02
099998-01
112806-01
112806-02
111817-02
111796-02
112376-01
111828-01
111803-03
111824-01
111816-01
111817-04
112809-04
112809-02
112809-03
111782-01
PART NUMBER FOR
111808-01
see table
page 25
111835-01
111803-05
111803-04
111800-01
111817-01
112823-01
111804-04
111819-05
111807-02
111796-01
097159-04
103784-01
103784-02
099998-01
112806-01
112806-02
111817-02
111796-02
103778-01
111828-01
------
111824-01
111816-01
111817-04
------
112809-02
112809-03
111782-01
111793-01
see table
page 25
111827-01
111803-02
111803-01
111800-01
111817-01
112823-01
111804-02
111819-08
111807-01
111796-01
097159-04
103784-01
103784-02
099998-01
112806-01
112806-02
111817-02
111796-02
112376-01
111828-01
111803-03
111824-01
111816-01
111817-04
111819-09
112809-04
111804-06
112809-02
112809-03
111792-01
111793-01
see table
page 25
111827-01
111803-02
111803-01
111800-01
111817-01
112823-01
111804-02
111819-06
111807-02
111796-01
097159-04
103784-01
103784-02
099998-01
112806-01
112806-02
111817-02
111796-02
103778-01
111828-01
------
111824-01
111816-01
111817-04
111819-07
------
111804-06
112809-02
112809-03
111782-01
DESCRIPTION QTY
GRATE ASSEMBLY
GTA (Gas Train Assembly)
LOG ASSEMBLY
BRACKET-BURNER RIGHT
BRACKET-BURNER LEFT
SCREW
FLEXTUBE 3/8 X 15
BRASS T-FITTING
BURNER, FRONT
ORIFICE, FRONT
VALVE
BRACKET-VALVE
PIEZO IGNITOR
CONTROL KNOB EXT.
CONTROL KNOB EXT.
SWITCH
REMOTE CONTROL ASSY.
BRACKET-REMOTE
FLEXTUBE 3/16 X 6
SHIELD-PILOT
PILOT
COMPRESSION NUT/SLEEVE
AIR SHUTTER, FRONT
COMPRESSION NUT/SLEEVE
SCREW
FLEXTUBE 3/8 X 19
ORIFICE, REAR
AIR SHUTTER, REAR
BURNER, REAR
BRACKET, REAR RIGHT
BRACKET, REAR LEFT
S CREW, 8-32 X 3/8
1
1
1
1
1
22
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
4
1
1
1
1
1
1
2
100563-01
112796-01
100639-01
GA6060
111288-02
112363-01
112364-01
112799-01
PARTS AVAILABLE NOT SHOWN
100563-01
112796-01
100639-01
GA6060
111288-02
112363-01
112364-01
112799-01
100563-01
112796-01
100639-01
GA6060
111288-02
112363-01
112364-01
112799-01
100563-01
112796-01
100639-01
GA6060
111288-02
112363-01
112364-01
112799-01
For more information, visit www.desatech.com
WARNING PLATE
LIGHTING INSTRUCTION
CAUTION DECAL
LAVA ROCK
GAS LINE FLEX 18
LOG SCRAP KIT#1
LOG SCRAP KIT#2
EMBER FLAKES KIT
1
1
1
1
1
1
1
1
111826-05
ACCESSORIES
Purchase these heater accessories from your local dealer. If they can not
supply these accessories, call DESA International at 1-866-672-6040
for referral information. You can also write to the address listed on
the back page of this manual.
EQUIPMENT SHUTOFF VALVE - GA5010
For all models. Equipment shutoff valve with 1/8" NPT tap. Fits
1/2" NPT pipe.
ACCESSORIES
27
27
VENT-FREE LOGMATE® FIREBOXES
(Not Shown)
Available in 32", 36", and 42" models. Circulating fireboxes feature
louvers and an optional blower. Non-circulating, smooth face models
are ideal for custom trim applications such as stone or marble.
FB32C (CIRCULATING), FB32NC (NONCIRCULATING) SERIES
(Not Shown)
For 18" and 24" models.
FB36CA, FB42C SERIES (CIRCULATING),
FB36NCA, FB42NC SERIES
(NON-CIRCULATING)
(Not Shown)
For all models.
FIREPLACE HOOD
Black - GA6050
Brass - GA6052
Antique Brass - GA6053
For all models. Helps deflect heat away from mantel or wall above
fireplace. Fits openings 28" to 48" wide.
DAMPER CLAMP - GA6080
(Not Shown)
For Remote-Ready and Variable Manually-Controlled Models.
Permanently opens chimney flue damper for vented operation.
LAVA ROCK - GA6060
(Not Shown)
For all models. Order when additional rock is desired. (1.8 lb.
bag)
CLEANING KIT - GCK
(Not Shown)
For all models. Your vent-free gas appliance requires regular
cleaning and maintenance to prevent performance problems. This
kit gives you the tools and instructions to make it easy to clean all
critical areas of your appliance.
INFORMATION VIDEO - 108917-01
For all models. A care and maintenance video is available by calling 1-866-672-6040.
111826-05
For more information, visit www.desatech.com
28
THIS PAGE INTENTIONALLY LEFT BLANK
For more information, visit www.desatech.com
111826-05
1. Where will the product be used?
❍ Living/Family Room ❍ Office/Warehouse ❍ Utility Shed/Outbuilding ❍ Garage ❍ Bedroom ❍ Bathroom ❍ Other
2. If you bought this product yourself, did you plan to purchase this type of product before going into the store? ❍ Yes ❍ No
3. Who selected the product? ❍ Male ❍ Female ❍ Both
4. What is the population of your area? ❍ Under 10,000 ❍ 10,000 to 25,000 ❍ 25,000 to 50,000 ❍ 50,000 to 100,000
❍ 100,000 to 250,000 ❍ Over 250,000
5. What is your primary source of heat? ❍ Propane (LP Gas) ❍ Fuel Oil ❍ Wood ❍ Natural Gas ❍ Electric ❍ Other
6. How was the product installed? ❍ Professional Installer ❍ Self ❍ Other
7. Cost of product excluding sales tax? $___________________
8. Cost to install product? $____________________
9. Type of store where product was purchased? ❍ Hardware ❍ Propane Dealer ❍ Natural Gas/Utility Co. ❍ Home Center/Builder’s Supply
❍ Fireplace or Hearth Shop ❍ Farm Store ❍ Other
10. What motivated you to buy this product? ❍ Sudden Cold Weather ❍ Replace Older Model ❍ D.I.Y. Home Project
❍ Emergency Back-Up Heat ❍ Heater was on Sale ❍ Energy Savings/High Efficiency ❍ Construction Project ❍ Other
11. How did you learn about this product brand? ❍ Advertising ❍ Relative or Friend ❍ Store Display ❍ Other ________________________
12. Level of Education of Purchaser: ❍ Some High School ❍ Completed High School ❍ Completed College ❍ Completed Graduate School
13. Age of Purchaser: ❍ Under 20 ❍ 20 - 29 ❍ 30 - 39 ❍ 40 - 49 ❍ 50 - 59 ❍ 60 or Over
14. Buyer’s total annual household income: ❍ Under $15,000 ❍ $15,000 to $19,999 ❍ $20,000 to $34,999 ❍ $35,000 to $49,999
❍ $50,000 to $74,999 ❍ $75,000 to $99,999 ❍ $100,000 and Over
15. Store where product was purchased:
Name: ______________________________________
City: _______________________ State: __________
16. In choosing this product, how important were the following:
Availability
Price
Brand Name
Overall Quality
Heat Output
Made in USA
Warranty
Local Service
Value for Price
Prior Brand Experience
Controls Location
Thermostat, Remote, or Manual Operation
Ease of Operation
Special Features
Salesperson’s Recommendation
Friend/Relative’s Recommendation
Portability
Quiet Operation
OWNER'S REGISTRATION FORM
Please answer the following questions to register your product with DESA:
In order to provide better customer service for this and future purchases, we recommend that you register your product with us.
You can register online at www.desatech.com. If access to our website is not available to you, please complete this Owner’s
Registration Form and mail to the address on the back of this owner’s manual. Please provide the following product information:
Not Important Somewhat Important Very Important
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❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
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Brand: (Comfort Glow, Vanguard, etc.)
Model: (EFP33PR, VTGH33NR, etc.)
Date Purchased:
Note:
Keep receipt for warranty verification.
Serial Number: 7 or 9 digit number located on product or identification tag.
First Name: Last Name:
Address:
City: State: Zip: Country:
Home Phone: ( ) -
E-Mail:
• ACCESSORIES
111826-05
For more information, visit www.desatech.com
29
29
30
TM
2701 S. Harbor Blvd.
Santa Ana, CA. 92704
www.desatech.com
Postage
Required
For more information, visit www.desatech.com
111826-05
NOTES
31
31
NOTES
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________________________________________________________________________________________________
For more information, visit www.desatech.com
111826-05
32
TM
111826-05
WARRANTY INFORMATION
KEEP THIS WARRANTY
Model
Serial No.
Date Purchased
Always specify model and serial numbers when communicating with the factory.
We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our standard written warranty. We
make no other warranty, expressed or implied.
LIMITED WARRANTY
VENT-FREE GAS LOG HEATERS
DESA International warrants this product to be free from defects in materials and components for four (4) years and five (5) years on stainless
steel burners from the date of first purchase, provided that the product has been properly installed, operated and maintained in accordance with all
applicable instructions. To make a claim under this warranty the Bill of Sale or cancelled check must be presented.
This warranty is extended only to the original retail purchaser. This warranty covers the cost of part(s) required to restore this heater to proper operating
condition and an allowance for labor when provided by a DESA Authorized Service Center. Warranty part(s) MUST be obtained through authorized
dealers of this product and/or DESA International who will provide original factory replacement parts. Failure to use original factory replacement parts
voids this warranty. The heater MUST be installed by a qualified installer in accordance with all local codes and instructions furnished with the unit.
This warranty does not apply to parts that are not in original condition because of normal wear and tear, or parts that fail or become damaged as a
result of misuse, accidents, lack of proper maintenance or defects caused by improper installation. Travel, diagnostic cost, labor, transportation and
any and all such other costs related to repairing a defective heater will be the responsibility of the owner.
TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE SALE OF THE PRODUCT; THIS
EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EXPRESSED WARRANTIES AND LIMITS THE DURATION OF ANY AND
ALL IMPLIED WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
TO FOUR (4) YEARS ON ALL COMPONENTS AND FIVE (5) YEARS ON STAINLESS STEEL BURNERS FROM THE DATE OF FIRST
PURCHASE; AND DESA INTERNATIONAL’S LIABILITY IS HEREBY LIMITED TO THE PURCHASE PRICE OF THE PRODUCT AND
DESA INTERNATIONAL SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES.
Some states do not allow a limitation on how long an implied warranty lasts or an exclusion or limitation of incidental or consequential damages,
so the above limitation on implied warranties, or exclusion or limitation on damages may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights that vary from state to state.
For information about this warranty write:
2701 S. Harbor Blvd.
Santa Ana, CA. 92704
www.desatech.com
NOT A UPC
For more information, visit www.desatech.com
111826-05
Rev. A
8/04
111826-05
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