Desa HDL18N Quick start guide

For more information, visit www.desatech.com
WARNING: If the information in this manual is not
followed exactly, a re or explosion may result causing
property damage, personal injury or loss of life.
— Do not store or use gasoline or other ammable
vapors and liquids in the vicinity of this or any other
appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the re
department.
— Installation and service must be performed by a quali-
ed installer, service agency or the gas supplier.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
UNVENTED (VENT-FREE) GAS LOG HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
18" AND 24" VARIAbLE MANUAL CONTROL MODELS
HDL18(N,P) AND HDL24(N,P)
Also Design-Certied
As Vented Decorative
Appliances

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SAFETy
WARNING: Improper
installation, adjustment,
alteration,serviceormain-
tenance can cause injury
or property damage. Refer
to this manual for correct
installation and operation-
al procedures. For assis-
tance or additional infor-
mation consult a qualied
installer, service agency
or the gas supplier.
WARNING: This ap-
pliance is for installation
only in a solid-fuel burning
masonry or UL127 fac-
tory-built fireplace or in
a listed ventless rebox
enclosure. It is design-cer-
tied for these installations
in accordance with ANSI
Z21.11.2. Exception: Do not
install this appliance in a
factory-built replace that
includes instructions stat-
ing it has not been tested
or should not be used with
unvented gas logs.
WARNING: This is an
unvented gas-red heat-
er. It uses air (oxygen)
from the room in which
it is installed. Provisions
for adequate combustion
and ventilation air must
be provided. Refer to Air
for Combustion and Ven-
tilation section on page 6
of this manual.
This appliance may be in-
stalled in an aftermarket,*
permanently located,
manufactured (mobile)
home, where not prohib-
ited by local codes.
This appliance is only for
use with the type of gas
indicated on the rating
plate. This appliance is
not convertible for use
with other gases.
* Aftermarket: Completion of sale, not for
purpose of resale, from the manufacturer
TAbLE OF CONTENTS
Safety .................................................................. 2
Product Identication........................................... 5
Local Codes......................................................... 5
Unpacking............................................................ 5
Product Features................................................. 5
Air For Combustion and Ventilation ..................... 6
Installation ........................................................... 8
Operation........................................................... 17
Inspecting Burners............................................. 18
Cleaning and Maintenance................................ 19
Troubleshooting................................................. 20
Parts .................................................................. 24
Specications .................................................... 26
Replacement Parts............................................ 26
Technical Service............................................... 26
Service Hints ..................................................... 26
Accessories ....................................................... 27
Parts Central...................................................... 27
Warranty ..............................................Back Cover

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122493-01C 3
WARNING: This product
contains and/or generates
chemicals known to the State
of California to cause cancer or
birth defects or other reproduc-
tive harm.
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, op-
erate or service this replace.
Improper use of this replace
can cause serious injury or
death from burns, re, explo-
sion, electrical shock and carbon
monoxide poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs
of carbon monoxide poisoning resemble the
u, with headaches, dizziness or nausea. If
you have these signs, the replace may not
be working properly. Get fresh air at once!
Have replace serviced. Some people are
more affected by carbon monoxide than oth-
ers. These include pregnant women, people
with heart or lung disease or anemia, those
under the inuence of alcohol and those at
high altitudes.
Natural and Propane/LP Gas: Natural and
propane/LP gases are odorless. An odor-mak-
ing agent is added to these gases. 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 replace.
WARNING: Any change to
this heater or its controls can
be dangerous.
SAFETy
Continued
WARNING: Do not use a
blower insert, heat exchanger
insert or other accessory not ap-
proved for use with this heater.
WARNING: Do not allow fans
to blow directly into the replace.
Avoid any drafts that alter burner
ame patterns. Ceiling fans can
create drafts that alter burner
ame patterns. Altered burner
patterns can cause sooting.
Due to high temperatures, the
appliance should be located out
of trafc and away from furniture
and draperies.
Do not place clothing or other
ammable material on or near
the appliance. Never place any
objects on the heater.
Heater base assembly becomes
very hot when running heater.
Keep children and adults away
from hot surface to avoid burns
or clothing ignition. Heater
will remain hot for a time after
shutdown. Allow surface to cool
before touching.
Carefully supervise young chil-
dren when they are in the room
with heater.
You must operate this heater
with a replace screen in place.
Make sure replace screen is
closed before running heater.
Keep the appliance area clear
and free from combustible ma-
terials, gasoline and other am-
mable vapors and liquids.

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SAFETy
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. To prevent performance problems, the
use of a propane/LP tank of less than
100 lbs. capacity is not recommended
(propane/LP units only).
4. If you smell gas
• shut off gas supply
• do not try to light any appliance
• do not touch any electrical switch; do not
use any phone in your building
• immediately call your gas supplier from
a neighbor’s phone. Follow the gas
supplier’s instructions
• if you cannot reach your gas supplier,
call the re department
5. This heater shall not be installed in a
bedroom or bathroom.
6. Do not burn solid-fuel in a masonry or
UL127 factory-built replace in which a
vent-free room heater is installed.
7. Before installing in a solid fuel burning re-
place, the chimney ue and rebox must
be cleaned of soot, creosote, ashes and
loose paint by a qualied chimney cleaner.
Creosote will ignite if highly heated. A dirty
chimney ue may create and distribute
soot within the house. Inspect chimney
ue and rebox for damage. If damaged,
repair ue before operating heater.
8. If replace has glass doors, never operate
this heater with glass doors closed. If you
operate heater with doors closed, heat
buildup inside replace will cause glass to
burst. Make sure there are no obstructions
across openings of replace.
9. This log heater is designed to be smoke-
less. If logs ever appear to smoke, turn off
heater and call a qualied service person.
Note: During initial operation, slight smok-
ing could occur due to log curing and
heater burning manufacturing residues.
10. To prevent the creation of soot, follow the
instructions in Cleaning and Maintenance,
page 19.
11. 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 or furniture.
12. This heater needs fresh, outside air ven-
tilation to run properly. This heater has an
Oxygen Depletion Sensing (ODS) safety
shutoff system. The ODS shuts down the
heater if not enough fresh air is available.
See Air for Combustion and Ventilation,
page 6. If heater keeps shutting off, see
Troubleshooting, page 20.
13. Do not run heater
• where ammable liquids or vapors are
used or stored
• under dusty conditions
14. Do not use this heater to cook food or burn
paper or other objects.
15. Do not use heater if any part has been ex-
posed to or under water. Immediately call
a qualied service technician to inspect
the room heater and to replace any part
of the control system and any gas control
which has been under water.
16. Do not operate heater if any log is broken.
Do not operate heater if a log is chipped
(dime-sized or larger).
17. Turn heater off and let cool before servic-
ing. Only a qualied service person should
service and repair heater.
18. Operating heater above elevations of
4,500 feet could cause pilot outage.
19. Provide adequate clearances around air
openings.
20. Solid fuels shall not be burned in a re-
place where a decorative appliance is
installed.
21. Installation and the provisions for com-
bustion and ventilation air must conform
with the National Fuel Gas Code, ANSI
Z223.1/NFPA 54.
22. When installing as a vented appliance in a
manufactured home or mobile home, the
installation must conform with the Manu-
factured Home Construction and Safety
Standard, Title 24 CFR, Part 3280.

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122493-01C 5
Figure 1 - Yellow Flame Vent-Free Gas Log Heater
LOCAL CODES
UNPACkING
PRODUCT IDENTIFICATION
Control Knob
Log Set
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/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
State of Massachusetts: The installa-
tion must be made by a licensed plumber
or gas fitter in the Commonwealth of
Massachusetts.
Sellers of unvented propane or natural
gas-red supplemental room heaters shall
provide to each purchaser a copy of 527
CMR 30 upon sale of the unit.
Vent-free gas products are prohibited for
bedroom and bathroom installation in the
Commonwealth of Massachusetts.
CAUTION: Do not remove the
data plates from the grate as-
sembly. The data plates contain
important warranty and safety
information.
1. Remove logs and heater base assembly
from carton.
Note: Do not pick up heater base assem-
bly by burners. This could damage heater.
Always handle base assembly by grate.
2. Remove all protective packaging applied
to logs and heater for shipment.
3. Check heater for any shipping damage. If
heater is damaged call DESA Heating, LLC
at 1-866-672-6040 for replacement parts
before returning to dealer.
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
realistic, dancing yellow ames. This heater
is designed for vent-free operation with ue
damper closed. It has been tested and
approved to ANSI Z21.11.2 standard for
unvented heaters. State and local codes
in some areas prohibit the use of vent-free
heaters.
SAFETY PILOT
This heater has a pilot with an Oxygen Deple-
tion Sensing (ODS) safety shutoff system. The
ODS/pilot is a required feature for vent-free
room heaters. The ODS/pilot shuts off the
heater if there is not enough fresh air.

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AIR FOR COMbUSTION AND VENTILATION
WARNING: This heater shall
not be installed in a room or space
unless the required volume of in-
door combustion air is provided
by the method described in the
National Fuel Gas Code, ANSI
Z223.1/NFPA 54, the International
Fuel Gas Code, or applicable lo-
cal codes. Read the following in-
structions to insure proper fresh
air for this and other fuel-burning
appliances in your home.
Today’s homes are built more energy efcient
than ever. New materials, increased insulation
and new construction methods help reduce
heat loss in homes. Home owners weather
strip and caulk around windows and doors
to keep the cold air out and the warm air in.
During heating months, home owners want
their homes as airtight as possible.
While it is good to make your home energy
efcient, your home needs to breathe. Fresh
air must enter your home. All fuel-burning ap-
pliances need fresh air for proper combustion
and ventilation.
Exhaust fans, replaces, clothes dryers and
fuel burning appliances draw air from the house
to operate. You must provide adequate fresh
air for these appliances. This will insure proper
venting of vented fuel-burning appliances.
PROVIDING ADEQUATE
VENTILATION
The following are excerpts from National Fuel
Gas Code. ANSI Z223.1/NFPA 54, Air for
Combustion and Ventilation.
All spaces in homes fall into one of the three
following ventilation classications:
1. Unusually Tight Construction
2. Unconned Space
3. Conned Space
The information on pages 6 through 8 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 un-
usually tight construction, you must provide
additional fresh air.
Unusually tight construction is dened as
construction where:
a. walls and ceilings exposed to the out-
side atmosphere have a continuous
water vapor retarder with a rating of
one perm (6x10-11 kg per pa-sec-m2) or
less with openings gasketed or sealed
and
b. weather stripping has been added on
openable windows and doors and
c. caulking or sealants are applied to
areas such as joints around window
and door frames, between sole plates
and oors, between wall-ceiling joints,
between wall panels, at penetrations
for plumbing, electrical and gas lines
and at other openings.
If your home meets all of the three criteria
above, you must provide additional fresh air.
See Ventilation Air From Outdoors, page 8.
If your home does not meet all of the three
criteria above, proceed to Determining
Fresh-Air Flow For Heater Location.
Conned Space and Unconned Space
The National Fuel Gas Code ANSI Z223.1/
NFPA 54 denes a conned space as a space
whose volume is less than 50 cubic feet per
1,000 Btu per hour (4.8 m3 per kw) of the ag-
gregate input rating of all appliances installed
in that space and an unconned space as a
space whose volume is not less than 50 cubic
feet per 1,000 Btu 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 un-
conned space.
* Adjoining rooms are communicating only if
there are doorless passageways or ventilation
grills between them.
DETERMINING FRESH-AIR FLOW
FOR FIREPLACE LOCATION
Determining if You Have a Conned or
Unconned Space
Use this work sheet to determine if you have
a conned or unconned space.
Space: Includes the room in which you will
install replace plus any adjoining rooms with
doorless passageways or ventilation grills
between the rooms.

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122493-01C 7
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) = 2,560 cu. ft.
(volume of space)
If additional ventilation to adjoining room
is supplied with grills or openings, add the
volume of these rooms to the total volume
of the space.
2. Multiply the space volume by 20 to determine
the maximum Btu/Hr the space can support.
________ (volume of space) x 20 = (Maxi-
mum Btu/Hr the space can support)
Example: 2,560 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 replace __________ Btu/Hr
Gas water heater* __________ Btu/Hr
Gas furnace __________ Btu/Hr
Vented gas heater __________ Btu/Hr
Gas replace logs __________ Btu/Hr
Other gas appliances* + __________ Btu/Hr
Total = __________ Btu/Hr
* Do not include direct-vent gas appliances.
Direct-vent draws combustion air from the
outdoors and vents to the outdoors.
Example:
Gas water heater __________ Btu/Hr
Vent-free replace + __________ 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)
71,500 Btu/Hr (actual amount of
Btu/Hr used)
The space in the example is a conned 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
unconned space, remove door to adjoining
40,000
31,500
71,500
AIR FOR COMbUSTION AND VENTILATION
Continued
Figure 2 - Ventilation Air from Inside Building
Or
Remove
Door into
Adjoining
Room,
Option
3
Ve ntilation Grills
Into Adjoining Room,
Option 2
Ve ntilation
Grills Into
Adjoining
Room,
Option 1
12"
12"
room or add ventilation grills between rooms.
See Ventilation Air From Inside Building.
B. Vent room directly to the outdoors. See
Ventilation Air From Outdoors, page 8.
C. Install a lower Btu/Hr replace, if lower Btu/Hr
size makes room unconned.
If the actual Btu/Hr used is less than the maxi-
mum Btu/Hr the space can support, the space is
an unconned space. You will need no additional
fresh air ventilation.
WARNING:Ifthearea inwhich
the heater may be operated does
not meet the required volume for
indoor combustion air, combus-
tion and ventilation air shall be
provided by one of the methods
described in the National Fuel
Gas Code,ANSI Z223.1/NFPA54,
the International Fuel Gas Code,
or applicable local codes.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining
unconfined space. When ventilating to an
adjoining unconned space, you must provide
two permanent openings: one within 12" of the
ceiling and one within 12" of the oor on the
wall connecting the two spaces (see options 1
and 2, Figure 2). You can also remove door into
adjoining room (see option 3, Figure 2). Fol-
low the National Fuel Gas Code ANSI Z223.1/
NFPA 54 Air for Combustion and Ventilation for
required size of ventilation grills or ducts.

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INSTALLATION
NOTICE: This heater is intended
for use as supplemental heat.
Use this heater along with your
primary heating system. Do not
install this heater as your pri-
mary heat source. If you have a
central heating system, you may
run system’s circulating blower
while using heater. This will help
circulate the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
WARNING: A qualied ser-
vice person must install heater.
Follow all local codes.
Figure 3 - Ventilation Air from Outdoors
Outlet
Air
V e ntilated
Attic
Outlet
A
ir
Inlet
Air
Inlet Air V e ntilated
Crawl Space
T o
Crawl
Space
T o Attic
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or ducts. You must provide two perma-
nent openings: one within 12" of the ceiling
and one within 12" of the oor. Connect these
items directly to the outdoors or spaces open
to the outdoors. These spaces include attics
and crawl spaces. Follow the National Fuel
Gas Code ANSI Z223.1/NFPA 54, 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 thermo-
stat-controlled power vent. Heated air entering
the attic will activate the power vent.
AIR FOR COMbUSTION AND VENTILATION
Continued
NOTICE:State orlocal codesmay
only allow operation of this appli-
ance in a vented conguration.
Check your state or local codes.
WARNING: Before installing
in a solid fuel burning replace,
the chimney ue and rebox
must be cleaned of soot, creo-
sote, ashes and loose paint by
a qualified chimney cleaner.
Creosote will ignite if highly
heated. A dirty chimney ue may
create and distribute soot within
the house. Inspect chimney ue
and rebox for damage. If dam-
aged, repair ue before operat-
ing heater.
WARNING: Seal any fresh
air vents or ash clean-out doors
located on oor or wall of re-
place. If not, drafting may cause
pilot outage or sooting. Use a
heat-resistant sealant. Do not
seal chimney ue damper.
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing or other ammable
objects are less than 36" from
front or 42" from top of heater.
For side clearances see Figure
4, page 9
• in high trafc areas
• in windy or drafty areas

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122493-01C 9
CAUTION: This heater cre-
ates warm air currents. These
currents move heat to wall sur-
faces next to heater. Installing
heater next to vinyl or cloth wall
coverings or operating heater
where impurities (such as, but
not limited to, tobacco smoke,
aromatic candles, cleaning u-
ids, oil or kerosene lamps, etc.) in
the air exist, may discolor walls
or cause odors.
IMPORTANT:Vent-free heaters add moisture
to the air. Although this is benecial, installing
heater in rooms without enough ventilation
air may cause mildew to form from too much
moisture. See Air for Combustion and Ventila-
tion, page 6.
CHECK GAS TYPE
Use only the correct gas type (natural or pro-
pane/LP) for your unit. If your gas supply is not
correct, do not install heater. Call dealer where
you bought heater for proper type heater.
WARNING: This appliance is
equipped for either natural gas
or propane/LP gas but not both.
Gas type is indicated on the rat-
ing plate. Field conversion is not
permitted.
INSTALLATION AND CLEARANCES
(Vent-Free Operation Only)
WARNING: Maintain the
minimum clearances. If you
can, provide greater clearances
from oor, ceiling and adjoining
wall.
MINIMUM FIREPLACE CLEARANCE
TO COMBUSTIBLE MATERIALS
Side Wall 16", Ceiling 42", Front 36"
Carefully follow the instructions below. This
will ensure safe installation into a masonry,
UL127-listed manufactured replace or certi-
ed vent-free rebox.
MINIMUM CLEARANCES FOR SIDE
COMBUSTIBLE MATERIAL, SIDE WALL
AND CEILING
A. Clearances from the side of the replace
cabinet to any combustible material and
wall should follow diagram in Figure 4.
Example: The face of a mantel, bookshelf,
etc. is made of combustible material and
protrudes 3 1/2" from the wall. This com-
bustible material must be 4" from the side
of the replace cabinet (see Figure 4).
Note: When installing your gas logs into
a manufactured rebox, follow rebox
manufacturer’s instructions for minimum
clearances to combustible materials.
B. Clearances from the top of the replace
opening to the ceiling should not be less
than 42".
NOTICE: Manual control heaters
may be used as a vented product.
If so, you must always run heater
with chimney ue damper open.
If running heater with damper
open, noncombustible material
above replace opening is not
needed. Go to Installing Damper
Clamp Accessory for Vented
Operation, page 11.
Figure 4 - Minimum Clearance for
Combustible to Wall
*Minimum 16" from Side Wall
*
Example
INSTALLATION
Continued
LOG SIZING REQUIREMENTS
Minimum Firebox Size
Height 17", Depth 13", Front Width 28",
Rear Width* 20.5"
*Measured at 13" Depth

www.desatech.com 122493-01C10
Minimum
Noncombustible
Material
Minimum
Noncombustible
Material Height
Distances to
Underside of
Mantel
To p of
Fireplace
Opening
Underside
of Mantel
Shelf
Mantel Shelf
12"
(A)
18" 20" 22" 24"
All
minimum
distances
are in
inches
2
1
/ 2 "
6"
8"
10"
INSTALLATION
Continued
If Using Mantel
You must have noncombustible material(s)
above the replace opening. Noncombustible
materials (such as slate, marble, tile, etc.) must
be at least 1/2" thick. With sheet metal, you
must have noncombustible material behind it.
Noncombustible material must extend at least
8" up. If noncombustible material is less than
12", you must install the replace hood acces-
sory. Even if noncombustible material is more
than 12", you may need the hood accessory to
deect heat away from your mantel shelf. See
Figures 5 and 6 and Figure 7 on page 11 for
minimum clearances.
MANTEL CLEARANCES
In addition to meeting noncombustible mate-
rial clearances, you must also meet required
clearances between replace opening and
mantel shelf. If you do not meet the clearances
listed below, you will need a hood.
Determining Minimum Mantel Clearance
If you meet minimum clearance between
mantel shelf and top of replace opening, a
hood is not required (see Figure 6).
Figure 6 - Minimum Mantel Clearances
Without Using Hood
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 clear-
ances shown in Figure 7, page 11, when
using a hood.
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 infor-
mation below.
You must have noncombustible material(s)
above the replace opening. Noncombustible
materials (such as slate, marble, tile, etc.)
must be at least 1/2" thick. With sheet metal,
you must have noncombustible material be-
hind it. Noncombustible material must extend
at least 8" up (for all models). If noncombus-
tible material is less than 12", you must install
the replace hood accessory. See Figure 5 for
minimum clearances.
Heat Resistant
Material
(A)
Figure 5 - Heat Resistant Material (Slate,
Marble, Tile, etc.) Above Fireplace
Noncombustible
Material
Distance (A)
Requirements for Safe
Installation
12" or more Noncombustible material
okay.
Between 8" Install replace hood and
12" accessory (GA6050,
GA6052 or GA6053 see
Accessories, page 27).
Less than 8" Noncombustible mate-
rial must be extended to
at least 8". See Between
8" and 12", above. If you
cannot extend material,
you must operate heater
with ue damper open.

www.desatech.com
122493-01C 11
INSTALLATION
Continued
Figure 7 - Minimum Mantel Clearances
When Using Hood
Minimum
Noncombustible
Material
8"
Min.
12" 15" 18" 20"
2½"
6"
8"
10"
12"
Distances to
Underside of
Mantel
Hood
(GA6050,
GA6052 or
GA6053)
To p of
Fireplace
Opening
Underside
of Mantel
Shelf
Mantel Shelf
14"
Min.
Combustible
Material
Noncombustible Material
Hearth
5"
Min.
Combustible
Material
Figure 9 - Minimum Fireplace Clearances
Above Combustible Flooring
Figure 8 - Minimum Fireplace Clearances
If Installed at Floor Level
NOTICE: Surface temperatures
of adjacent walls and mantels be-
come hot during operation. Walls
and mantels above the rebox
may become hot to the touch.
If installed properly, these tem-
peratures meet the requirement
of the national product standard.
Follow all minimum clearances
shown in this manual.
NOTICE: If your installation does
not meet the minimum clear-
ances shown, you must do one
of the following:
• raise the mantel to an accept-
able height
• remove the mantel
FLOOR CLEARANCES
A. If installing appliance on the oor level,
you must maintain the minimum distance
of 14" to combustibles (see Figure 8).
B. If combustible materials are less than 14"
to the replace, you must install appliance
at least 5" above the combustible ooring
(see Figure 9).
INSTALLING DAMPER CLAMP
ACCESSORY FOR VENTED
OPERATION
Note: When used as a vented heater, ap-
pliance must be installed only in a solid-fuel
burning fireplace with a working flue and
constructed of noncombustible material.
For Massachusetts Residents Only: Instal-
lation of this gas log set as a vented appliance
in the Commonwealth of Massachusetts re-
quires the damper be permanently removed
or welded in the fully open position.
If your heater is a manually-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 replace 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 ue
damper. You must install the damper clamp
accessory (to order, see Accessories, page
27). This will insure vented operation (see
Figure 10, page 12). The damper clamp will
keep damper open. Installation instructions
are included with clamp accessory.

www.desatech.com 122493-01C12
Heater Gas
Regulator
Flexible Gas Hose
(if allowed by local codes)
Figure 11 - Attaching Flexible Gas Hose
to Heater Gas Regulator
Fitting
INSTALLING HEATER BASE
ASSEMBLY
CAUTION: Do not remove the
data plates attached to the heater
base assembly. The data plates
contain important warranty and
safety information.
WARNING: You must secure
this heater to replace oor. If
not, heater will move when you
adjust controls. Moving heater
may cause a gas leak.
INSTALLATION
Continued
Area of Various Standard Round Flues
Diameter Area
5" 20 sq. inches
6" 29 sq. inches
7" 39 sq. inches
8" 51 sq. inches
Chimney Minimum Permanent
Height Flue Opening
6' to 15' 39 sq. inches
15' to 30' 29 sq. inches
Damper
Damper
Clamp
Damper
Damper
Clamp
Damper
Figure 10 - Attaching Damper Clamp
Manufactured Fireplace
Masonry Fireplace
WARNING: If installing in a
sunken replace, special care
is needed. You must raise the
replace oor to allow access to
heater control panel. This will in-
sure adequate air ow and guard
against sooting and controls be-
ing damaged. Raise replace oor
with noncombustible material.
Make sure material is secure.
CAUTION: Do not pick up
heater base assembly by the
burner. This could damage
heater. Only handle base as-
sembly by grates.
IMPORTANT: Make sure heater burners are
level. If heater is not level, heater will not
work properly.
Installation Items Needed
• hardware package (provided with heater)
• approved exible gas hose (not provided)
(if allowed by local codes)
• sealant (resistant to propane/LP gas, not
provided)
• electric drill with 3/16" drill bit
• athead screwdriver
1. Apply pipe joint sealant lightly to male
threads of tting to be threaded into gas
regulator. Connect approved exible gas
hose to gas regulator of heater (see Fig-
ure 11).
IMPORTANT: Hold gas regulator with
wrench when connecting exible gas hose.
2. Locate masonry screws in hardware
package.
3. Position heater base assembly in re-
place.
See chart below for minimum permanent ue
opening you must provide. Attach damper
clamp so the minimum permanent ue open-
ing will be maintained at all times.

www.desatech.com
122493-01C 13
INSTALLATION
Continued
4. Place logs in their proper position on heater
base (see Installing Logs,page 16).
5. Center heater base and logs front-to-front
and side-to-side in replace.
6. Carefully remove logs without moving
heater base.
7. Mark screw locations through holes in
mounting brackets (see Figure 12). If
installing in a brick-bottom replace, mark
screw locations in mortar joint of bricks.
8. Remove heater base from replace.
9. Drill holes at marked locations using 3/16"
drill bit.
10. Attach base assembly to replace oor
using two masonry screws (in hardware
package) (see Figure 12).
Figure 12 - Attaching Base Assembly to
Fireplace Floor
Masonry
Screw
Mounting
Bracket
CONNECTING TO GAS SUPPLY
WARNING: This appliance
requires a 1/2" NPT (National
Pipe Thread) inlet connection to
the pressure regulator.
WARNING: A qualied service
person must connect heater to gas
supply. Follow all local codes.
CAUTION: Never connect
propane/LP heater directly to the
propane/LP supply. Propane/LP
heaters require an external regu-
lator (not supplied). Install the
external regulator between the
heater and propane/LP supply.
WARNING: For natural gas
units, never connect heater 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
* A CSA design-certied equipment shutoff
valve with 1/8" NPT tap is an acceptable al-
ternative to test gauge connection. Purchase
the optional CSA design-certied equipment
shutoff valve from your dealer.
For propane/LP gas, installer must supply
an external regulator. External regulator will
reduce incoming gas pressure. You must
reduce incoming gas pressure to between
11" and 14" of water. If you do not reduce
incoming gas pressure, heater regulator dam-
age could occur. Install external regulator with
vent pointing down as shown in Figure 13.
Pointing vent down protects it from freezing
rain or sleet.
Figure 13 - External Regulator With Vent
Pointing Down
Propane/LP
Supply Tank
External
Regulator
with Vent
Pointing
Down

www.desatech.com 122493-01C14
INSTALLATION
Continued
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
your local codes. Use pipe of
1/2" diameter or greater to allow
proper gas volume to heater. If
pipe is too small, undue loss of
volume will occur.
Installation must include an equipment shutoff
valve, union and plugged 1/8" NPT tap. Locate
NPT tap within reach for test gauge hook up.
NPT tap must be upstream from heater (see
Figure 14).
IMPORTANT: Install equipment shutoff valve
in an accessible location. Main gas valve is for
turning on or shutting off gas to appliance.
Check your building codes for any special
requirements for locating equipment shutoff
valve to replaces.
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from
going into pipe. Excess sealant in pipe could
result in clogged heater valves.
WARNING: Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.
Figure 14 - Gas Connection
* Purchase optional CSA design-certified
equipment shutoff valve from your dealer.
** Min. inlet pressure for purpose of input
adjustment.
Tee Cap Pipe
Joint Nipple
3" Min.
Sediment Trap
Gas
Regulator
CSA Design-Certied
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved
Flexible
Gas Hose (if
allowed by
local codes)
Natural
From Gas Meter
(5" W.C.** to
10.5" W.C.
Pressure)
Propane/LP
From External
Regulator
(11" W.C.**
to 14" W.C.
Pressure
We recommend that you install sediment trap
in supply line as shown in Figure 14. Locate
sediment trap where it is within reach for
cleaning. Install in piping system between
fuel supply and heater. Locate sediment
trap where trapped matter is not likely to
freeze. A sediment trap traps moisture and
contaminants. This keeps them from going
into heater controls. If sediment trap is not
installed or is installed wrong, heater may
not run properly.
CAUTION: Avoid damage to
regulator. Hold gas regulator
with wrench when connecting it
to gas piping and/or ttings.
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping
and connections , internal and
external to unit, for leaks after
installing or servicing. Correct
all leaks at once.
WARNING: Never use an
open ame to check for a leak.
Apply a commercial leak de-
tection solution to all joints.
Bubbles forming show a leak.
Correct all leaks at once.
CAUTION: For propane/LP
units, make sure external regula-
tor has been installed between
propane/LP supply and heater.
See guidelines under Connect-
ing to Gas Supply, page 13.
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 equip-
ment shutoff valve from gas supply piping.
Pressures in excess of 1/2 psig will dam-
age heater regulator.

www.desatech.com
122493-01C 15
INSTALLATION
Continued
Figure 15 - Equipment Shutoff Valve
Equipment Shutoff Valve
Propane/LP
Supply Tank
Control Valve
Location
Figure 16 - Checking Gas Joints
(Propane/LP Gas Only)
Open
Closed
Equipment
Shutoff Valve
2. Cap off open end of gas pipe where equip-
ment 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 sys-
tem. Apply a commercial leak detection
solution to all joints. Bubbles forming show
a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff
valve to gas supply. Check reconnected
ttings for leaks.
Test Pressures Equal To or Less Than
1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Fig-
ure 15).
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 (natural
gas) or propane/LP supply to equipment
shutoff valve (see Figure 16 or 17). Apply
a commercial leak detection solution 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 Fig-
ure 15).
2. Open main gas valve located on or near
gas meter for natural gas or open pro-
pane/LP supply tank valve.
3. Make sure control knob of heater is in the
OFF position.
4. Check all joints from gas meter (natural
gas) or propane/LP supply to equipment
shutoff valve (see Figure 16 or 17). Apply
a commercial leak detection solution to all
joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light heater (see Operation, page 17.
Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to
Appliance, page 18.
Figure 17 - Checking Gas Joints
(Natural Gas Only)
Gas
Meter
Equipment Shutoff Valve
Control Valve Location

www.desatech.com 122493-01C16
INSTALLATION
Continued
INSTALLING LOGS
WARNING: Failure to posi-
tion the parts in accordance
with these diagrams or failure
to use only parts specically
approved with this heater may
result in property damage or
personal injury.
CAUTION: After installa-
tion and periodically thereafter,
check to ensure that no ame
comes in contact with any log.
With the heater set to High, check
to see if ames contact any log. If
so, reposition logs according to
the log installation instructions
in this manual. Flames contact-
ing logs will create soot.
It is very important to install these logs exactly
as instructed. Do not modify logs. Only use
logs supplied with heater.
1. Place main log assembly (#1) onto base.
Cutout on front right will t over burner
(see Figure 18). Holes in bottom of log
must seat over pins on base as shown
in Figure 18. Make sure back of log as-
Figure 18 - Installing Main Log (#1)
Back
Tab
Burner
Front Tab
Notch for
Front Tab
Cutout Fits
Over Burner
Front Tab
Notch for
Front Tab
Main Log Assembly
Pin for
Hole in
Bottom
of Log
Figure 19 - Installing Front Log (#2)
Front Log
Grate
Figure 20 - Installing Crossover Log (#3)
Crossover
Log Recesses
on Logs
sembly is resting on back tabs of base.
There are 2 small notches on front of log
that t onto front tabs and 2 small notches
on back that t over back tabs.
2. Place front log onto grate. Log is notched
to sit over grate (see Figure 19).
3. Place crossover log onto recesses on
main log and front log (see Figure 20).
Note: Nontextured end of crossover log
faces back of rebox and will not be seen
from front of log set.
4. Add lava rock around base of heater if
desired. Do not place any lava rock on
logs or burner.

www.desatech.com
122493-01C 17
OPERATION
FOR YOUR SAFETY
READ BEFORE LIGHTING
WARNING: If you do not fol-
low these instructions exactly,
a re or explosion may result
causing property damage, per-
sonal injury or loss of life.
A. This appliance has a pilot which must
be lighted by hand. When lighting
the pilot, follow these instructions
exactly.
B. BEFORE LIGHTING smell all around
the appliance area for gas. Be sure to
smell next to the oor because some
gas is heavier than air and will settle
on the oor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do
not use any phone in your building.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier,
call the re department.
C. Use only your hand to push in or turn
the gas control knob. Never use tools.
If the knob will not push in or turn by
hand, don’t try to repair it, call a quali-
ed service technician or gas supplier.
Force or attempted repair may result in
a re or explosion.
D. Do not use this appliance if any part
has been under water. Immediately call
a qualied service technician to inspect
the appliance and to replace any part of
the control system and any gas control
which has been under water.
LIGHTING
INSTRUCTIONS
WARNING
• If replace has glass doors,
never operate this heater with
glass doors closed. If you op-
erate heater with doors closed,
heat buildup inside replace
will cause glass to burst. Make
sure there are no obstructions
across openings of replace.
• You must operate this heater
with a replace screen in place.
Make sure replace screen is
closed before running heater.
NOTICE: During initial operation
of new heater, burning logs will
give off a paper-burning smell.
Orange ame will also be pres-
ent. Open damper or window to
vent smell. This will only last a
few hours.
Note: Home owners generally prefer to oper-
ate their heater with chimney damper closed.
This will put all of the heat into room. However,
there may be times you will desire full ames
of HI heat setting but will nd heat output
excessive. You can open chimney damper
(if you have one) fully or partially to release
some heat.
WARNING: Damper handle
will be hot if heater has been
running.
1. STOP! Read the safety information,
column 1.
2. Make sure equipment shutoff valve is fully
open.
3. Press in and turn control knob clockwise
to the OFF position.
4. Wait ve (5) minutes to clear out any gas.
Then smell for gas, including near the
oor. If you smell gas, STOP! Follow “B”
in the safety information, column 1. If you
don’t smell gas, go to the next step.

www.desatech.com 122493-01C18
5. Press in control knob and turn counter-
clockwise to the PILOT position
(see Figure 21). The ignitor will spark
once. Keep control knob pressed in for 5
seconds. If control knob does not pop up
when released, contact a qualied service
person or gas supplier for repairs.
Note: You may be running this heater for
the rst time after hooking up to gas sup-
ply. If so, the control knob may need to be
pressed in for 30 seconds or more. This will
allow air to bleed from the gas system.
6. Turn control knob clockwise to
OFF position. Press in control knob and
turn counterclockwise to PILOT
position. This will light pilot. Pilot is at-
tached to rear of burner. If needed, repeat
this process until pilot lights.
Note: If pilot does not stay lit, contact a
qualied service person or gas supplier
for repairs. Until repairs are made, light
pilot with match. To light pilot with match,
see Manual Lighting Procedure.
7. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob.
Note: If pilot goes out, repeat steps 3
through 7.
OPERATION
Continued
Figure 21 - Control Knob and Ignitor
Button Location
PILOT
OFF
LO
HI
Control Knob
Figure 22 - Correct Pilot Flame Pattern
Figure 23 - Incorrect Pilot Flame Pattern
Pilot Burner
Thermocouple
Pilot Burner
Thermocouple
INSPECTING bURNERS
Check pilot ame pattern and burner ame
patterns often.
PILOT FLAME PATTERN
Figure 22 shows a correct pilot ame pattern.
Figure 23 shows an incorrect pilot ame pat-
tern. Incorrect pilot ame is not touching ther-
mocouple. This will cause the thermocouple
to cool. When thermocouple cools, heater
will shut down.
If pilot ame pattern is incorrect, as shown
in Figure 23
• turn heater off (see To Turn Off Gas to
Appliance, above
• see Troubleshooting, page 20
• If control knob does not pop out when
released, contact a qualified service
person or gas supplier for repairs.
8. Slightly press and turn control knob coun-
terclockwise to desired heating
level. The burner should light. Set control
knob to HI or LO.
WARNING: Do not operate
heater between PILOT and HIGH
positions.
9. To leave pilot lit and shut off burners only,
turn control knob clockwise to the
PILOT position.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
TO TURN OFF GAS
TO APPLIANCE
1. Turn control knob clockwise to OFF
position.
2. Close equipment shutoff valve (see Figure
15, page 15).
MANUAL LIGHTING
PROCEDURE
1. Follow steps 1 through 5 under Lighting
Instructions beginning on page 17.
2. Press control knob and light pilot with
match.
3. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob. Now follow step 8
under Lighting Instructions, above.

www.desatech.com
122493-01C 19
Note: Pilot ame on natural gas units will have
a slight curve, but ame should be blue and
have no yellow or orange color.
BURNER PRIMARY AIR HOLES
Air is drawn into burner through holes in t-
ting at entrance to burner. These holes may
become blocked with dust or lint. Periodically
inspect these holes for any blockage and
clean as necessary. Blocked air holes will
create soot.
INSPECTING bURNERS
Continued
MAIN BURNER
Periodically inspect all burner ame holes
with heater running. All slotted burner ame
holes should be open with yellow ame pres-
ent. All round burner ame holes should be
open with a small blue ame present. Some
burner ame holes may become blocked by
debris or rust, with no ame present. If so,
turn off heater and let cool. Remove blockage,
blocked burner ame holes will create soot.
Figure 24 - Injector Holder On Outlet
Burner Tube
Burner Tube
Primary Air Inlet
Holes (Shape of
Holes May Vary
by Model)
Injector Holder (May Be Brass or
Aluminum Depending on Model)
Figure 25 - Pilot Inlet Air Hole
Pilot
Assembly
Pilot Air Inlet Hole
CLEANING AND MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep con-
trol areas, burner and circulating
air passageways of heater clean.
Inspect these areas of heater
before each use. Have heater
inspected yearly by a qualied
service person. Heater may need
more frequent cleaning due to
excessive lint from carpeting,
bedding material, pet hair, etc.
WARNING: Failure to keep
the primary air opening(s) of
the burner(s) clean may result in
sooting and property damage.
Once every year a qualied agency or certied
chimney sweep should examine and clean the
venting system of replace.
ODS/PILOT AND BURNER
Use a vacuum cleaner or small, soft bristled
brush to clean.
BURNER INjECTOR HOLDER AND
PILOT AIR INLET HOLE
The primary air inlet holes allow the proper
amount of air to mix with the gas. This pro-
vides a clean burning ame. Keep these holes
clear of dust, dirt and lint. Clean these air inlet
holes prior to each heating season. Blocked
air holes will create soot. We recommend that
you clean the unit every three months during
operation and have heater inspected yearly
by a qualied service person.
We also recommend that you keep 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. If
using compressed air in a can, please follow
directions on can. If you don’t follow directions
on can, you could damage pilot assembly.
1. Shut off unit, including pilot. Allow unit to
cool for at least thirty minutes.
2. Inspect burner, pilot and primary air inlet
holes on injector holder for dust and dirt
(see Figure 24).
3. Blow air through ports/slots and holes in
burner.
4. Check injector holder located at end of
burner tube again. Remove any large
particles of dust, dirt, lint or pet hair with
a soft cloth or vacuum cleaner nozzle.

www.desatech.com 122493-01C20
5. Blow air into primary air holes on injector
holder.
6. In case any large clumps of dust have now
been pushed into burner, repeat steps 3
and 4.
Clean pilot assembly also. A yellow tip on pilot
ame indicates dust and dirt in pilot assembly.
There is a small pilot air inlet hole about 2"
from where pilot ame comes out of pilot as-
sembly (see Figure 25, page 19). With unit off,
lightly blow air through air inlet hole. You may
blow through a drinking straw if compressed
air is not available.
TROUbLESHOOTING
WARNING: Turn off and unplug heater and let cool before servicing.
Only a qualied service person should service and repair heater.
CAUTION: Never use a wire, needle or similar object to clean
ODS/pilot. This can damage ODS/pilot unit.
Note: All troubleshooting items are listed in order of operation.
POSSIBLE CAUSE
1. Ignitor electrode not con-
nected to ignitor cable
2. Ignitor cable pinched or
wet
3. Broken ignitor cable
4. Bad piezo ignitor
5. Ignitor electrode broken
6. Ignitor electrode positioned
wrong
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 in-
stalled
5. Depleted gas supply (pro-
pane/LP only)
6. ODS/pilot is clogged
7. Gas regulator setting is not
correct
OBSERVED PROBLEM
When control knob is pressed
in and turned to PILOT, there
is not spark at ODS/pilot
When control knob is pressed
in and turned to PILOT, there
is spark at ODS/pilot but no
ignition
REMEDY
1. Reconnect ignitor cable
2. Free ignitor cable if pinched
by any metal or tubing.
Keep ignitor cable dry
3. Replace valve
4. Replace valve
5. Replace valve
6. Replace valve
1. Turn on gas supply or open
equipment shutoff valve
2. Turn control knob to PILOT
position
3. Press in control knob while
in PILOT position
4. Continue holding down con-
trol knob. Repeat igniting op-
eration until air is removed
5. Contact local propane/LP
gas company
6. Clean ODS/pilot (see Clean-
ing and Maintenance,page
19) or replace ODS/pilot
assembly
7. Replace gas regulator
CLEANING AND MAINTENANCE
Continued
LOGS
• If you remove logs for cleaning, refer to Install-
ing Logs, page 16, to properly replace logs.
• Replace log(s) if broken or chipped (dime-
sized or larger).
BURNER PRIMARY AIR HOLES
Air is drawn into burner through the 8 holes
in brass tting at entrance to burner. These
holes may become blocked with dust or lint.
Periodically inspect these holes for any block-
age and clean as necessary. Blocked air holes
will create soot.