Desa Comfort Glow CF26NTA Quick start guide

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WARNING: If the information in this manual is not fol-
lowed exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
— Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• 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 quali-
fied installer, service agency or the gas supplier.
UNVENTED (VENT-FREE) BAY FRONT GAS LOG FIREPLACE
OWNER’S OPERATION AND INSTALLATION MANUAL
MODELS CF26PTA AND CF26NTA
19,000 TO 26,000 BTU/HR REMOTE CONTROL READY
Patent Pending
Fireplace Shown With Optional Bay Front Mantel
AUTO
OFF
ON

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2
WARNING: Improper installation, adjustment, altera-
tion, service or maintenance can cause injury or prop-
erty damage. Refer to this manual for correct installation
and operational procedures. For assistance or addi-
tional information consult a qualified installer, service
agency or the gas supplier.
WARNING: This is an unvented gas-fired heater. It uses
air (oxygen) from the room in which it is installed. Provi-
sions for adequate combustion and ventilation air must
be provided. Refer to Air for Combustion and Ventilation
section on page 5 of this manual.
This appliance may be installed in an aftermarket,* per-
manently located, manufactured (mobile) home, where
not prohibited by local codes.
This appliance is only for use with the type of gas indi-
cated on the rating plate. This appliance is not convert-
ible for use with other gases.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
State of Massachusetts: The installation must be made by a licensed plumber or gas fitter in the
Commonwealth of Massachusetts.
Sellers of unvented propane or natural gas-fired 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 Common-
wealth of Massachusetts.
TABLE OF CONTENTS
Safety Information ............................................... 3
Local Codes ........................................................ 4
Unpacking ........................................................... 4
Product Identification ........................................... 5
Product Features ................................................. 5
Air For Combustion and Ventilation ..................... 5
Installation ........................................................... 8
Operating Fireplace ........................................... 19
Inspecting Burners ........................................... 20
Cleaning and Maintenance ................................ 21
Troubleshooting ................................................. 23
Specifications .................................................... 27
Replacement Parts ............................................ 27
Service Hints ..................................................... 27
Technical Service .............................................. 27
Illustrated Parts Breakdown and Parts List ....... 28
Accessories ....................................................... 32
Parts Central ..................................................... 34
Warranty Information ...........................Back Cover

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113896-01B 3
SAFETY INFORMATION
WARNING: This product con-
tains and/or generates chemicals
known to the state of California
to cause cancer or birth defects
or other reproductive harm.
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, op-
erate or service this fireplace.
Improper use of this fireplace
can cause serious injury or
death from burns, fire, 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 flu, with head-
aches, 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 pro-
pane/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 warn-
ings. 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 ap-
proved 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 ob-
jects in the fireplace or on logs.
Fireplace front and screen be-
come very hot when running fire-
place. Keep children and adults
away from hot surfaces to avoid
burns or clothing ignition. Fire-
place will remain hot for a time
after shutdown. Allow surfaces
to cool before touching.
Carefully supervise young chil-
dren when they are in the room
with fireplace.
You must operate this fireplace
with a fireplace screen in place.
Make sure fireplace screen is
closed before running heater.
Keep the appliance area clear
and free from combustible ma-
terials, gasoline and other flam-
mable vapors and liquids.

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4
SAFETY INFORMATION
Continued
1. This appliance is only for use with the type
of gas indicated on the rating plate. This ap-
pliance is not convertible for use with other
gases.
2. Do not place propane/LP supply tank(s) in-
side 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
neighborʼs phone. Follow the gas supplierʼs
instructions
• if you cannot reach your gas supplier, call
the fire department
4. This fireplace shall not be installed in a bed-
room or bathroom.
5. Do not use this fireplace as a wood-burning
fireplace. Use only the logs provided with the
fireplace.
6. Do not add extra logs or ornaments such as
pine cones, vermiculite or rock wool. Using
these added items can cause sooting. Do not
add lava rock around base. Rock and debris
could fall into the control area of fireplace.
7. This fireplace is designed to be smokeless.
If logs ever appear to smoke, turn off fire-
place and call a qualified service person.
Note: During initial operation, slight smoking
could occur due to log curing and fireplace
burning manufacturing residues.
8. To prevent the creation of soot, follow the
instructions in Cleaning and Maintenance,
page 21.
9. 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.
10. This fireplace needs fresh air ventilation to run
properly. This fireplace has an Oxygen Deple-
tion Sensing (ODS) safety shutoff system. The
ODS shuts down the fireplace if not enough
fresh air is available. See Air for Combustion
and Ventilation, page 5. If fireplace keeps
shutting off, see Troubleshooting, page 23.
11. Do not run fireplace
• where flammable liquids or vapors are used
or stored.
• under dusty conditions.
12. Do not use this fireplace to cook food or to
burn paper or other solid fuels.
13. Do not use fireplace if any part has been under
water. Immediately call a qualified service
technician to inspect the room fireplace and
to replace any part of the control system and
any gas control which has been under water.
14. Turn off and unplug fireplace and let cool
before servicing. Only a qualified service
person should service and repair fireplace.
15. Operating fireplace above elevations of 4,500
feet could cause pilot outage.
16. Do not operate fireplace if any log is broken.
Do not operate fireplace if a log is chipped
(dime-sized or larger).
17. To prevent performance problems, do not use
propane/LP fuel tank of less than 100 lbs.
capacity (propane/LP units only).
18. Provide adequate clearances around air
openings.
LOCAL CODES
Install and use fireplace with care. Follow all local
codes. In the absence of local codes, use the lat-
est 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
UNPACKING
1. Remove and fireplace from carton.
2. Remove all protective packaging applied to
fireplace for shipment.
3. Make sure your fireplace includes one hard-
ware packet.
4. Check fireplace for any shipping damage. If
fireplace is damaged, promptly inform dealer
where you bought fireplace.

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113896-01B 5
PRODUCT
IDENTIFICATION
Heater Controls
(Inside Door) Screen
Fireplace
Cabinet
Logs
Brick
Liner
Figure 1 - Vent-Free Propane/LP Gas
Compact Fireplace
PRODUCT FEATURES
SAFETY PILOT
This fireplace has a pilot with an Oxygen Deple-
tion Sensing (ODS) safety shutoff system. The
ODS/pilot is a required feature for vent-free room
fireplaces. The ODS/pilot shuts off the fireplace if
there is not enough fresh air.
PIEZO IGNITION SYSTEM
This fireplace has a piezo ignitor. This system
requires no matches, batteries or other sources to
light fireplace.
AIR FOR COMBUSTION
AND VENTILATION
WARNING: This heater shall
not be installed in a confined
space or unusually tight con-
struction unless provisions are
provided for adequate combus-
tion and ventilation air. Read the
following instructions to insure
proper fresh air for this and
other fuel-burning appliances
in your home.
Todayʼs 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 effi-
cient, 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 fol-
lowing ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 5 through 7 will help
you classify your space and provide adequate
ventilation.

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6
AIR FOR COMBUSTION
AND VENTILATION
Continued
Unusually Tight Construction
The air that leaks around doors and windows
may provide enough fresh air for combustion and
ventilation. However, in buildings of unusually
tight construction, you must provide additional
fresh air.
Unusually tight construction is defined as
construction where:
a. walls and ceilings exposed to the out-
side atmosphere have a continuous
water vapor retarder with a rating of
one perm (6 x 10-11 kg per pa-sec-m2) or
less with openings gasketed or sealed
and
b. weather stripping has been added on
openable windows 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 7.
If your home does not meet all of the three
criteria above, proceed to Determining
Fresh-Air Flow For Fireplace Location.
Confined and Unconfined Space
The National Fuel Gas Code, ANSI Z223.1 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 appli-
ances installed in that space and an unconfining
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 uncon-
fined space.
* Adjoining rooms are communicating only if
there are doorless
DETERMINING FRESH-AIR FLOW
FOR FIREPLACE 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 door-
less 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)
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: 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 fireplace ___________ 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. Di-
rect-vent draws combustion air from the outdoors
and vents to the outdoors.
Example:
Gas water heater __________ Btu/Hr
Vent-free fireplace + ________ 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)
56,000 Btu/Hr (actual amount of
Btu/Hr used)
30,000
26,000
56,000

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113896-01B 7
The space in the above example is a confined space
because the actual Btu/Hr used is more than the maxi-
mum 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 adjoin-
ing 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.
B. Vent room directly to the outdoors. See Ventila-
tion Air From Outdoors.
C. Install a lower Btu/Hr fireplace, if lower Btu/Hr
size makes room unconfined.
If the actual Btu/Hr used is less than the maximum
Btu/Hr the space can support, the space is an un-
confined space. You will need no additional fresh
air ventilation.
WARNING: If the area in
which the heater may be oper-
ated 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.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining un-
confined space. When ventilating to an adjoining
unconfined space, you must provide two perma-
nent 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.
AIR FOR COMBUSTION
AND VENTILATION
Continued
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 Shown with Optional Mantel
Or
Remove
Door into
Adjoining
Room,
Option 3
Ventilation Grills
Into Adjoining Room,
Option 2
12"
12"
Ventilation
Grills
into Adjoining
Room,
Option 1
Figure 3 - Ventilation Air from Outdoors
Shown with Optional Mantel
Outlet
Air
Ventilated
Attic
Outlet
A
ir
Inlet
Air
Inlet Air Ventilated
Crawl Space
To Attic
To
Crawl
Space

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8
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 qualified ser-
vice person must install fire-
place. Follow all local codes.
Note: Your Comfort Glow fireplace is designed
to be used in zero clearance installations. Wall or
framing material can be placed directly against
any exterior surface of your fireplace, except
where standoff spacers are integrally attached.
If standoff spacers are attached to your fireplace,
these spacers can be placed directly against wall
or framing materials.
Use the dimensions shown for rough openings to
create the easiest installation (see Built-In Fire-
place Installation, page 9).
CHECK GAS TYPE
Use the correct gas type (natural or propane/LP)
for your unit. If your gas supply is not correct, do
not install fireplace. Call dealer where you bought
fireplace for proper type fireplace.
WARNING: This appliance
is equipped for (natural or pro-
pane/LP) gas. Field conversion
is not permitted.
LOCATING FIREPLACE
WARNING: Maintain the
minimum clearances shown in
Figure 4 and 5, page 9. If you can,
provide greater clearances from
floor, ceiling and joining wall.
You can recess firebox into the wall. You can also
position fireplace in the optional cabinet mantels.
IMPORTANT: Only use optional cabinet mantels
specified in this manual. Purchase the optional man-
tel from your dealer (see Accessories, page 32).
WARNING: Never install the
fireplace
• in a bedroom or a bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing or other flammable
objects are less than 42 inches
from the front, top or sides of
the fireplace
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas
CAUTION: This fireplace cre-
ates warm air currents. These
currents move heat to wall sur-
faces next to fireplace. Installing
fireplace next to vinyl or cloth
wall coverings or operating
fireplace where impurities (such
as, but not limited to, tobacco
smoke, aromatic candles, clean-
ing fluids, oil or kerosene lamps,
etc.) in the air exist, may discolor
walls or cause odors.
IMPORTANT: Vent-free fireplaces add moisture
to the air. Although this is beneficial, installing fire-
place in rooms without enough ventilation air may
cause mildew to form from too much moisture. See
Air for Combustion and Ventilation, page 5.
CAUTION: If you install the
fireplace in a home garage
• fireplace pilot and burner must be
at least 18 inches above floor.
• locate fireplace where moving
vehicle will not hit it.
For convenience and efficiency, install fireplace
• where there is easy access for operation, inspec-
tion and service.
• in coldest part of room.

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113896-01B 9
BUILT-IN FIREPLACE
INSTALLATION
Built-in installation of this fireplace involves in-
stalling fireplace into a framed-in enclosure. This
makes the front of fireplace flush with wall. Follow
the instructions below to install the fireplace in this
manner. If installing a built-in mantel above the
fireplace, you must follow the clearances shown
in Figure 9, page 11. If using for built-in instal-
lation off of the floor, follow clearances shown
in Figure 4.
Actual Framing
Height 26" 26 7/8"
Front Width 26 3/4" 26 7/8"
Depth 9 1/2" 10 1/2"
Bottom 3/4" 3/4"
1. Frame in rough opening. Use dimensions shown
in Figure 6 for the rough opening.
If installing in a corner, use dimensions shown
in Figure 7 for the rough opening. The height
is 26 1/8" which is the same as the wall opening
above.
2. An optional blower accessory is available (see
Accessories, page 32). There are two options
for connecting blower to electrical source.
Option one: Have a licensed electrician install
a properly grounded, three-prong 120-volt
electrical outlet at fireplace location. Locate
outlet inside the framed enclosure. Blower
power cord will plug into this outlet.
INSTALLATION
Continued
An optional blower kit is available from your
dealer. See Accessories, page 32. If planning to use
blower, locate fireplace near an electrical outlet.
Note: When installing fireplace directly on carpet-
ing, tile or other combustible material, other than
wood flooring, the fireplace shall be installed on a
metal or wood panel extending the full width and
depth of the fireplace.
365/8"
257/8"
513/4"
267/8"
Figure 7 - Rough Opening for Installing
in Corner
267/8"
267/8"
3/4" Off
The Floo
r
Minimum
10 1/2"
Figure 6 - Rough Opening for Installing
in Wall
Figure 5 - Mounting Clearances As
Viewed From Front of Fireplace Shown
with Optional Mantel
Figure 4 - Mounting Clearances As
Viewed From Front of Fireplace Shown
Built In The Wall
6"
Minimum
From
Sides Of
Fireplace
Left
Side
CEILING
42" Minimum
FLOOR
Right
Side
Top Of
Mantel Can
Be Flush
With Wall
Left
Side
CEILING
Right
Side
42"
Minimum
0" Minimum Clearance To Top Surface Of
Carpeting, Tile Or Other Combustible Material
0" Minimum Clearance To Top Surface Of
Carpeting, Tile Or Other Combustible Material

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10
INSTALLATION
Continued
Option two: Have a licensed electrician con-
nect blower to electrical source at junction box
inside fireplace.
If using option one, have electrical outlet in-
stalled at this time. If using option two, do not
connect blower to electrical source at junction
box until step 6.
3. Install gas piping to fireplace location. This
installation includes an approved flexible gas
line (if allowed by local codes) after the equip-
ment shutoff valve. The flexible gas line must
be the last item installed on the gas piping.
4. Carefully set fireplace in front of rough opening
with back of fireplace inside wall opening.
5. Attach flexible gas line to fireplace gas regula-
tor. See Connecting Fireplace to Gas Supply,
page 16.
6. If the optional blower has been installed con-
nect blower to electrical source.
Option one: Route blower electrical cord
through side or rear access door of fireplace.
Plug electrical cord into electrical outlet.
Option two: Have a licensed electrician con-
nect blower to electrical source at junction box
inside fireplace.
7. Bend four nailing flanges on outer casing with
pliers (see Figure 8).
8. Attach fireplace to wall studs using nails
or wood screws through holes in nailing
flange.
9. Check all gas connections for leaks. See
Checking Gas Connections, page 17.
IMPORTANT: When finishing your firebox,
combustible materials such as wall board, gyp-
sum board, sheet rock, drywall, plywood, etc.
may be butted up next to the sides and top of
the firebox. Combustible materials should never
overlap the firebox front facing. Firebox should
not be placed on top of carpet or other kinds of
fibrous material.
WARNING: Do not allow any
combustible materials to overlap
the firebox front facing.
IMPORTANT: Noncombustible materials such as
brick, tile, etc. may overlap the front facing, but
should never cover any necessary openings like
louvered slots.
Figure 8 - Attaching Fireplace to Wall
Studs
Nails or
Wood
Screws
Nailing
Flanges
WARNING: Do not allow non-
combustible materials to cover
any necessary openings like
louvered slots.
WARNING: Never modify or
cover the louvered slots on the
front of the firebox.
WARNING: Use only non-
combustible mortar or adhe-
sives when overlapping the front
facing with noncombustible
facing material.
Mantel Clearances for Built-In Installation
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.
If placing mantel above built-in fireplace, you must
meet minimum clearance between mantel shelf and
top of fireplace opening.

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113896-01B 11
INSTALLATION
Continued
13"
16"
19"
21"
2 1/2"
6"
8"
10"
Minimum Non-
Combustible
Material
Figure 9 - Minimum Mantel Clearances
for Built-In Installation
Mantel Shelf
Note: All vertical
measurements
are from top
of fireplace
opening to
bottom of
mantel shelf.
REMOVING BRICK LINER
RETAINER
1. Using Phillips screw driver, remove 2 screws
attaching brick liner retainers to vertical
sides.
2. Remove brick liner retainers and discard.
Replace 2 screws into vertical sides.
ASSEMBLING TRIM
(Trim shipped with mantel)
1. Remove packaging from three pieces of trim.
2. Locate two adjusting plates with set screws
and two shims in the hardware packet.
3. Align shim under adjusting plate as shown in
Figure 10.
4. Slide one end of adjusting plate/shim in slot
on mitered edge of top trim (see Figure 10).
5. Slide other end of adjusting plate/shim in slot
on mitered edge of side trim (see Figure 10).
Figure 10 - Assembling Trim
Top
Trim
Side
Trim
Mitered
Edge
Shim
Set Screws
Adjusting
Plate
Slot
Slot
OPTIONAL MANTEL INSTALLATION
Note: Refer to instructions provided with the man-
tel for assembly instructions. Refer to instructions
below for system installation. If using blower ac-
cessory (see Accessories, page 32), see installation
instructions on pages 12 through 15.
1. Choose location for fireplace and install gas
supply line.
2. Remove screen from fireplace by removing
screws in each end of screen rod (see Figure
11). Hold screen rod cover while removing
five hex head screws underneath hood (see
Figure 12). Carefully lift and pull out hood
(see Figure 13, page 12).
AUTO
OFF
ON
Figure 11 - Removing Screen
Figure 12 - Removing Hood Screws
Hood
Screen Rod
Cover
Screw
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
6. While firmly holding edges of trim together,
tighten both set screws on the adjusting plate
with slotted screwdriver.
7. Repeat steps 1 through 6 for other corner.
8. Set trim assembly aside for later installation.

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12
INSTALLATION
Continued
3. Assemble trim kit. See Assembling Trim,
page 11.
4. Place trim on the shoulder screws located on
the side and top of the fireplace. Firmly snap
the trim over the shoulder screws on fireplace
(see Figure 14).
5. Place mantel base close to wall in desired
fireplace location.
6. Install gas line. See Connecting To Gas Sup-
ply, page 15
7. Carefully place fireplace on mantel base and
center left to right. Check for gas leaks. See
Checking Gas Connections, page 17.
8. Refer to instructions provided with the mantel
for permanent attachment to wall.
9. Slide mantel around fireplace. Be careful not
to damage wall or mantel.
10. Adjust assembly to remove any gaps. From
back side of fireplace, attach two 2" wood
screws through base mounting blocks at-
tached to bottom sides of mantel into base
(see instructions provided with mantel).
11. Attach remaining two 3" wood screws from
hardware pack through openings inside of
fireplace sides into the mantel. See Figure 13
for screw hole location.
Figure 13 - Removing Hood
Mantel
Screw
Location
Shoulder
Screws
Assembled
Trim
Figure 14 - Attaching Trim to Fireplace
INSTALLING BLOWER ASSEMBLY
GA3450T
CAUTION: Label all wires
prior to disconnection when
servicing controls. Wiring errors
can cause improper and danger-
ous operation.
CAUTION: Verify proper op-
eration after servicing.
Note: If you are using a mantel with your heater,
use the following instructions. If your heater is
built-in, see For Built-In Installation on page 14.
1. Screen and hood should be removed from
fireplace (see page 9). Remove log set and set
aside.
2. Install snap bushings found in hardware kit
into both holes in rear of blower control shield
(see Figure 15).
3. Make sure the wire harness is firmly con-
nected to the terminals on the blower bracket
assembly.
4. Note the wire locations on back of AUTO/
OFF/ON switch. Carefully remove red wire
from the AUTO terminal and blue wire from
the ON terminal. Black wire can remain on
the middle or OFF terminal (see Figure 16,
page 13).
5. Carefully disconnect green and white wires
from power cord harness at their insulated
connectors.
6. In top of the heater cabinet, locate the four
mounting holes on the outer casing. Align
these four holes with those on the blower
bracket assembly. Attach blower bracket as-
sembly to the outer casing with 4 - #10 screws
provided (see Figure 16, page 13).
7. Route the wire harness through the hole to the
left side of heat deflector. Pull wire harness
through lower opening to the left of the blower
control shield. (see Figure 16, page 13).
Snap
Bushing
Figure 15 - Installing Snap Bushings
Blower
Control
Shield

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113896-01B 13
INSTALLATION
Continued
Figure 16 - Installing Blower Bracket Assembly
Wire Harness
Blower Bracket
Assembly
Screw
Power
Cord
Blower
Control
Shield
Shield Cover
Wire
Harness
Switch
Heat
Deflector
Wiring Routing
Hole
Blue
Red
Switch Plate
Blower Control
Shield
Figure 17 - Installing Switch Plate to Blower Control Shield
Switch Plate
Screw
8. Insert the 4 wire harness into one of the round
holes in the rear of the blower control shield
and through the rectangular hole in the front
of shield (see Figure 16).
9. Reconnect red wire to the AUTO switch posi-
tion. Reconnect blue wire to the ON switch
position. Reconnect green and white wires to
the power cord.
10. Install the switch plate on the blower control
shield with 2 - #10 screws provided (see Fig-
ure 17). Route power cord out of the cabinet
by inserting it through the bushing on the
outer casing (see Figure 16). Plug fan kit into
120-Volt grounded power supply and test
operation. Note: When switch is in the AUTO
position, the fan will start after the heater has
run for a few moments. The fan will continue
to run for several moments after the heater
has been turned off. When switch is in the
ON position, the fan will run until turned to
OFF. Reinstall hood assembly and close lower
louver door.

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14
INSTALLATION
Continued
For Built-In Installation
WARNING: A licensed elec-
trician must connect the wiring
harness to electrical supply
following all local codes. Electri-
cian must provide a clamp on the
box cover to secure the wiring.
Wiring should be routed through
the bushing in the hole on the
outer casing of heater.
WARNING: ELECTRICAL
GROUNDING INSTRUCTIONS
This appliance is equipped with a
three-prong (grounding) plug for
your protection against shock
hazard and should be plugged
directly into a properly grounded
three-prong receptacle.
Figure 18 - Installing Blower Bracket Assembly
Blower Bracket
Assembly
Screw
Wire
Harness
Power
Cord
Blower
Control
Shield
Shield
Cover
Wire
Harness
Switch
Plate
Switch
Clamp
Connector (not
included)
Outlet
Receptacle
Strain
Relief
Blue
Red
1. Install a snap bushing found in hardware kit
into one of the holes found on rear of blower
control shield. The other hole is for a strain
relief clamp (not supplied) to secure incoming
electrical supply.
2. Follow steps 2 through 6 in Installing Blower
Assembly, page 12. Also remove black wire
from middle/OFF switch terminal.
3. Remove black plastic strain relief and power
cord from switch plate (see Figure 18). The
power cord supplied will not be used in built-
in installations. Pop in the plastic snap bushing
found in hardware kit into the hole left by
supply cord/strain relief.
4. A licensed electrician must follow the wiring
diagram in Figure 19, page 15 to connect
incoming electrical supply to fan kit wiring
harness.
5. Test to make sure the blower is working
properly.
6. Reinstall hood assembly (see page 12) and
close lower louver door.
7. Place log set back into unit.

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113896-01B 15
Red Red
Fan Switch
(Auto/Off/On)
Blue
Blue
Thermostat
Switch
(N.O.)
Green
White
Green
White
On
110/115
V.A.C. Blower
Motor
Black
Off
1
2
3
Auto
CONNECTING TO GAS SUPPLY
WARNING: This appliance
requires a 1/2" NPT (National
Pipe Thread) inlet connection
to the pressure regulator.
WARNING: A qualified ser-
vice person must connect heater
to gas supply. Follow all local
codes.
CAUTION: Never connect pro-
pane/LP fireplace directly to the
propane/LP supply. This fireplace
requires an external regulator
(not supplied). Install the external
regulator between the fireplace
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 fireplace, 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 *
• ground joint union
• sediment trap
• tee joint
• pipe wrench
• test gauge connection *
* 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 32.
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 pres-
sure, heater regulator damage could occur. Install
external regulator with the vent pointing down
as shown in Figure 20. Pointing the vent down
protects it from freezing rain or sleet.
CAUTION: Use only new,
black iron or steel pipe. In-
ternally-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.
Propane/LP
Supply Tank
External
Regulator
Figure 20 - External Regulator With Vent
Pointing Down
Vent
Pointing
Down
Figure 19 - Wiring Diagram For Fan
Accessory Built-In Installation
INSTALLATION
Continued

www.desatech.com 113896-01B
16
INSTALLATION
Continued
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 21).
IMPORTANT: Install equipment shutoff valve
in an accessible location. The equipment shutoff
valve is for turning on or shutting off the gas to
the appliance.
Check your building codes for any special re-
quirements for locating equipment shutoff valve
to fireplaces.
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from
going into pipe. Excess sealant in pipe could result
in clogged heater valves.
WARNING: Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.
We recommend that you install a sediment trap in
supply line as shown in Figure 21. 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.
* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer. See
Accessories, page 32.
** Minimum inlet pressure for purpose of input
adjustment.
3" Minimum
Gas
Control
Propane/LP
From External
Regulator
(11" W.C.** to
14" W.C.
Pressure)
Natural From
Gas Meter
(5" W.C.**
to 10.5" W.C.
Pressure)
CSA Design-Certified
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved Flexible
Gas Hose
Figure 21 - Gas Connection
Cap Pipe Tee
Nipple Joint
Sediment Trap
AUTO
OFF
ON
Figure 22 - Routing Flexible Gas Line
Equipment
Shut Off
Valve
Figure 23 - Attaching Flexible Gas Lines
Together
Outer
Casing
CONNECTING FIREPLACE TO GAS
SUPPLY
Installation Items Needed
• Phillips screwdriver
•
sealant (resistant to propane/LP gas, not provided)
1. Route flexible gas line (provided by installer)
from equipment shutoff valve into fireplace
through side or rear access holes in outer
casing (see Figure 22).
NOTICE: Most building codes
do not permit concealed gas
connections. A flexible gas line
is provided to allow accessibility
from the fireplace (see Figure 23).
The flexible gas supply line con-
nection to the equipment shutoff
valve should be accessible.
2. Apply pipe joint sealant lightly to male threads
of gas connector attached to flexible gas line
(see Figure 23). Connect flexible gas line
to flexible gas line attached to gas valve of
fireplace (see Figure 23).
Flexible Gas Line from
Fireplace Gas Regulator
To Fireplace Gas
Regulator
Equipment
Shutoff Valve
Provided by
Installer
To Gas Meter

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113896-01B 17
Figure 24 - Equipment Shutoff Valve
Open
Closed
Equipment
Shutoff
Valve
Figure 26 - Checking Gas Joints Natural
Gas (Shown with Optional Mantel)
Gas Meter
Equipment
Shutoff Valve
INSTALLATION
Continued
3. Check all gas connections for leaks. See
Checking Gas Connections.
4. Feed flexible gas line into fireplace base area.
Make sure the entire flexible gas line is in
fireplace mantel base area.
CAUTION: Avoid damage to
regulator. Hold gas regulator
with wrench when connecting it
to gas piping and/or fittings.
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 flame to check for a leak.
Apply a noncorrosive leak detec-
tion fluid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
CAUTION: Make sure exter-
nal regulator has been installed
between propane/LP supply and
heater. See guidelines under Con-
necting to Gas Supply, page 15.
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.
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 24).
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 sup-
ply to equipment shutoff valve for propane/LP
(see Figures 25 and 26). Apply noncorrosive
leak detection fluid to all joints. Bubbles form-
ing show a leak.
4. Correct all leaks at once.
Figure 25 - Checking Gas Joints Propane/LP
Gas (Shown with Optional Mantel)
Equipment Shutoff Valve
Propane/LP
Supply Tank

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18
INSTALLATION
Continued
Figure 27 - Installing One-Piece Log Set
AUTO
OFF
ON
One Piece
Log Set
Burner
“U”-shaped
Cutout in
Chassis
Chassis
Figure 28 - Installing One-Piece Log set
(Top View)
One Piece Log Set
Burner
Ports
PRESSURE TESTING HEATER GAS
CONNECTIONS
1. Open equipment shutoff valve (see Figure 24,
page 17).
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
thermostat gas valve (see Figures 25 and 26, page
17). 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, page 19).
Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to Appli-
ance, page 21).
8. Replace front panel.
INSTALLING LOGS
WARNING: Failure to posi-
tion the parts in accordance
with these diagrams or failure
to use only parts specifically
approved with this heater may
result in property damage or
personal injury.
CAUTION: After installa-
tion and periodically thereafter,
check to ensure that no flame
comes in contact with any log.
With the heater set to HI, check
to see if flames contact any log. If
so, reposition logs according to
the log installation instructions
in this manual. Flames contact-
ing logs will create soot.
It is very important to install the logs exactly as
instructed. Do not modify logs. Only use logs
supplied with heater.
Place one-piece log set on grate to fit as illustrated
in Figure 27. Make sure back section of log set is
seated into “U”-shaped cutout in center of chassis
(see Figure 27). IMPORTANT: Make sure log does
not cover any burner ports (see Figure 28).

www.desatech.com
113896-01B 19
OPERATING FIREPLACE
FOR YOUR SAFETY
READ BEFORE LIGHTING
WARNING: If you do not fol-
low these instructions exactly,
a fire 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 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 neighborʼs phone. Follow the gas
supplierʼs 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, donʼt
try to repair it, call a qualified service tech-
nician 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.
Open a window to vent smell.
This will only last a few hours.
1. STOP! Read the safety information above.
2. Make sure equipment shutoff valve is fully
open.
3. Turn control knob clockwise to the
OFF position.
4. Wait five (5) minutes to clear out any gas.
Then smell for gas, including near the floor.
If you smell gas, STOP! Follow “B” in the
safety information, column 1. If you donʼt
smell gas, go to the next step.
5. Turn control knob counterclockwise
to the PILOT position. Press in control
knob for five (5) seconds (see Figure 29).
Note: You may be running this heater for
the first 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.
• If control knob does not pop out when
released, contact a qualified service person
or gas supplier for repairs.
6. 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, page 20.
7. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob.
Note: If pilot goes out, repeat steps 3
through 7. This heater has a safety interlock
system. Wait one (1) minute for system to
reset before lighting pilot again.
8. Turn control knob counterclockwise
to desired heating level. The burners should
light. Set control knob to any heat level
between HI and LO.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
Figure 30 - Pilot (Propane/LP Shown)
Thermocouple
Ignitor
Electrode Pilot
Burner
Control Knob
Ignitor Button
Figure 29 - Control Knob and Ignitor Button

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20
OPERATING FIREPLACE
Continued
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
Turn control knob clockwise to the OFF
position.
Shutting Off Burner Only (pilot stays lit)
Turn control knob clockwise to the
PILOT position.
THERMOSTAT CONTROL
OPERATION
The thermostat control knob can be set to any
comfort level between HI and LO. The ther-
mostat will gradually modulate the heat output
and flame height from higher to lower settings
or pilot, in order to maintain the comfort level
you select. The ideal comfort setting will vary
by household depending upon the amount of
space to be heated, the output of the central
heating system, etc.
Note: Selecting the HI setting with the control
knob will cause the burner to remain fully on,
without modulating down in most cases.
MANUAL LIGHTING
PROCEDURE
1. Follow steps 1 through 6 under Lighting
Instructions, page 19.
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 step 8 under
Lighting Instructions, page 19.
INSPECTING BURNERS
Check pilot flame pattern and burner flame pat-
terns often.
PILOT FLAME PATTERN
Figure 31 shows a correct pilot flame pattern.
Figure 32 shows an incorrect pilot flame pattern.
The incorrect pilot flame is not properly heating
the thermocouple. When the thermocouple cools,
the heater will shut down.
If pilot flame pattern is incorrect, as shown in
Figure 32
• turn heater off (see To Turn Off Gas to Appli-
ance, column 1)
• see Troubleshooting, page 23
Note: The correct pilot flame on natural gas units
will have a slight curve, but flame should be blue
and have no yellow or orange color.
Figure 31 - Correct Pilot Flame Pattern
(propane/LP ignitor shown)
Figure 32 - Incorrect Pilot Flame Pattern
(propane/LP ignitor shown)
Pilot Burner
Thermocouple
Pilot Burner Thermocouple