Desa VF-18N-EMU, VF-24N-EMU, VF-18P-EMU, VF-24P-EMU User Manual
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
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