Vanguard FBST Quick start guide

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UNVENTED (VENT-FREE) LogMate®UNIVERSAL FIREBOX
OWNER’S OPERATION AND INSTALLATION MANUAL
MODEL FBST
36" See-Thru Heat-Circulating Firebox
FOR YOUR SAFETY
— Donotstoreorusegasolineoranyotherammable
vapors or 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.
WARNING:Iftheinformationintheseinstructionsis
not followed exactly, a re or explosionmay result
causingpropertydamage,personalinjuryordeath.

www.desatech.com 105116-01D2
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qualiedinstaller,service
agency or the gas supplier.
WARNING: For use only with decorative type unvented
roomheaters.Donotbuildawoodre.
This rebox has been tested and approved by I.A.S.
under their REQ. 2-97 for use with any ANS Z21.11.2
approved gas logs.
Thisreboxmaybeinstalledinanaftermarket*,perma-
nentlylocated,manufactured(mobile)home,wherenot
prohibited by state or local codes.
*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 tter 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 Common-
wealth of Massachusetts.
TABLE OF CONTENTS
Safety Information ............................................... 3
Product Specications......................................... 4
Local Codes......................................................... 4
Unpacking............................................................ 4
Product Features................................................. 4
Locating Firebox ................................................. 5
Air for combustion and Ventilation ....................... 5
Installation ........................................................... 8
Operating Guidelines and
Maintenance Instructions.............................. 15
Replacement Parts............................................ 15
Illustrated Parts Breakdown and Parts List........ 16
Technical Service............................................... 18
Accessories ....................................................... 18
Warranty Information ...........................Back Cover

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105116-01D 3
SAFETY INFORMATION
IMPORTANT: Read this owner’s
manualcarefullyandcompletely
beforetryingtoassemble,operate
orservicethisrebox.Improper
useofthisreboxcancausese-
riousinjuryordeathfromburns,
re,explosion,electricalshockor
carbonmonoxidepoisoning.
CAUTION: Carefully review
the instructions supplied with
the decorative type unvented
room heater for the minimum
reboxsizerequirement.Donot
installtheapplianceinthisre-
boxunlessthisreboxmeetsthe
minimumdimensions required
for the installation.
WARNING: Any change to
thisreboxoritscontrolscan
be dangerous.
WARNING:Donot useablow-
er insert, heat exchanger insert
or other accessory not approved
forusewiththisrebox.
Do not allow fans to blow directly
intotherebox.Avoidanydrafts
thatalterburneramepatterns.
Ceiling fans can create drafts
thatalterburneramepatterns.
Altered burner patterns can
cause sooting.
Firebox front and screen be-
comes very hot when running
rebox.Keepchildrenandadults
awayfromhotsurfacestoavoid
burns or clothing ignition. Fire-
box 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rebox.
Youmustoperatethisreplace
with the provided fireplace
screen,hoodandbricklinerin
place. Make sure these parts
are in place and screens are
closed before running rebox.
Thesuppliedhoodsmaynotbe
replacedwithhoodswhichmay
be provided with a log heater.
Keep the appliance area clear
andfreefromcombustiblema-
terials,gasolineandotheram-
mablevaporsandliquids.
1. This rebox shall not be installed in a bedroom
or bathroom.
2. Never install the rebox
• in a recreational vehicle
• where curtains, furniture, clothing or other
ammable objects are less than 42" from the
front, top or sides of the rebox
• in high trafc areas
• in windy or drafty areas
3. Do not use this rebox as a wood-burning
replace. Use only decorative unvented room
heaters (log sets).
4. Do not add extra logs or ornaments such as
pine cones, vermiculite or rock wool. Using
these added items can cause sooting.
5. Use only the provided hoods or appropriate
polished brass hood accessories. See Acces-
sories on page 18.
6. Vent-free gas log heaters installed in this rebox
require fresh air ventilation to run properly. See
Air for Combustion and Ventilation, page 5.
7. Do not run rebox
• where ammable liquids or vapors are used
or stored
• under dusty conditions
8. Do not use this rebox to cook food or burn
paper or other objects.
9. Never place any objects in rebox or on logs.
10. Turn rebox off and let cool before servicing.
Only a qualied service person should service
and repair rebox.
11. Operating vent-free logs in a rebox above eleva-
tions of 4,500 feet could cause pilot outage.

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12. Do not use the rebox if it has been under water
due to the shock hazard that could result with
the blower accessary (if installed) in place.
13. Provide adequate clearances around air
openings.
LOCAL CODES
Install and use rebox with care. Follow all local
codes. In the absence of local codes, use the lat-
est edition of The National Fuel Gas Code ANS
Z223.1/NFPA 54*. Firebox must be electrically
grounded in accordance with the National Electri-
cal Code, ANS/NFPA70 (latest edition).
*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 all protective packaging from inside
rebox. Carefully lift the rebox off the bot-
tom corrugated tray.
2. Carton should contain 2 deflective hoods
and hardware packet in addition to rebox
assembly. If items are missing, inform dealer
where you bought rebox.
3. Check all items for any shipping damage. If
damaged, promptly inform dealer where you
bought rebox.
NOTICE:Thereboxidentica-
tionlabel(includingmodelnum-
ber, serial number, clearances,
etc.) is located directly above
thebricklinerandundertheheat
shield. See Figure 20, page 15.
PRODUCT FEATURES
OPERATION
This rebox is designed for use with approved ANS
Z21.11.2 decorative type unvented room heaters.
(Physical size limitations apply. Refer to minimum
rebox requirements supplied with log heater.) It
requires no outside venting or chimney making in-
stallation easy and inexpensive. When used without
the blower, the rebox requires no electricity mak-
ing it ideal for emergency backup heat.
PRODUCT
SPECIFICATIONS
Figure 1 - Dual-Sided Firebox
4
1
/
4
"
3
5
/
8
"
5
12"
4"
1
1
/
4
"
1/2"
5/8"
20
1
/
2
"19
1
/
2
"
5
1
/
2
"
2
1
/
4
"
40"
18
1
/
2
"
9
1
/
8
"
36
1
/
4
"
1
3
/
4
"
24"
36
1
/
2
"
3" TYP.
42
1
/
2
"
44
1
/
4
"
4
1
/
4
"
3
5
/
8
"
5
12"
4"
1
1
/
4
"
1/2"
5/8"
20
1
/
2
"19
1
/
2
"
5
1
/
2
"
2
1
/
4
"
40"
18
1
/
2
"
9
1
/
8
"
36
1
/
4
"
1
3
/
4
"
24"
36
1
/
2
"
3" TYP.
42
1
/
2
"
44
1
/
4
"
BLOWER ACCESSORY
The FBST rebox will accept the GA3500A ac-
cessory. The variable blower allows you to select
the fan speed you desire. The blower circulates
heated air from the rebox into the room. Use of
blower is optional.
BRICKLINER
This rebox features a concrete brick liner. As
with all concrete liners, this liner may develop
slight cracks when exposed to heat. These cracks
will not affect the performance of the rebox or
vent-free gas logs.
SAFETY INFORMATION
Continued

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105116-01D 5
LOCATING FIREBOX
PLANNING
Plan where you will install the rebox. This will
save time and money later when you install the re-
box. Before installation, consider the following:
1. Where the rebox will be located. Allow for
wall and ceiling clearances (see Installation
Clearances, page 8).
2. Everything needed to complete installation.
3. These models CANNOT be installed in a
bedroom or bathroom.
4. Proper air for combustion and ventilation.
5. Consider a location where heat output would
not be affected by drafts, air condition ducts,
windows or doors.
6. A location that minimizes modications on ex-
isting framing will make installation easier.
Projected installations can extend any dis-
tance into the room. A projection may be ideal
as a partition between two otherwise common
areas when added to an existing, nished wall
(see Figure 2).
Internal wall installation provides a discreet
viewing option between two adjacent rooms or
within an added wall to subdivide an oversize
room.
Figure 2 - Projected Installation
AIR FOR COMBUSTION
AND VENTILATION
WARNING:Thisreboxshall
not be installed in a conned
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.
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 appliances need
fresh air for proper combustion and ventilation.
Exhaust fans, reboxes, 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 ANS 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 classications:
1. Unusually Tight Construction
2. Unconned Space
3. Conned Space
The information on pages 5 through 7 will help
you classify your space and provide adequate
ventilation.
Unusually Tight Construction
The air that leaks around doors and windows
may provide enough fresh air for combustion and
ventilation. However, in buildings of unusually
tight construction, you must provide additional
fresh air.

www.desatech.com 105116-01D6
Unusually tight construction is dened as con-
struction where:
a. walls and ceilings exposed to the outside
atmosphere have a continuous water vapor
retarder with a rating of one perm (6 x 10-
11 kg per pa-sec-m2) or less with openings
gasketed or sealed and
b. weather stripping has been added on open-
able 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, elec-
trical 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 cri-
teria above, proceed to Determining Fresh-Air
Flow for Firebox Location.
ConnedandUnconnedSpace
The National Fuel Gas Code ANS 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 m3per kw) of the aggregate 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 m3per kw) of the aggregate input rating of
all appliances installed in that space. Rooms com-
municating directly with the space in which the
appliances are installed*, through openings not
furnished with doors, are considered a part of the
unconned space.
This heater shall not be installed in a conned
space or unusually tight construction unless provi-
sions are provided for adequate combustion and
ventilation air.
* Adjoining rooms are communicating only if
there are doorless passageways or ventilation grills
between them.
AIR FOR COMBUSTION
AND VENTILATION
Continued
DETERMINING FRESH-AIR FLOW
FOR FIREBOX 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
heater plus any adjoining rooms with doorless
passageways or ventilation grills between the
rooms.
1. Determine the volume of the space (length x
width x height).
Length x Width x Height =__________cu. ft.
(volume of space)
Example: Space size 22 ft. (length) x 18 ft.
(width) x 8 ft. (ceiling height) = 3168 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: 3168 cu. ft. (volume of space) x 20 =
63,360 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in
the space.
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. Di-
rect-vent draws combustion air from the outdoors
and vents to the outdoors.
Example:
Gas water heater _____________Btu/Hr
Gas rebox logs + ____________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: 63,360 Btu/Hr (maximum the space
can support)
79,000 Btu/Hr (actual amount of
Btu/Hr used)
40,000
39,000
79,000

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105116-01D 7
The space in the above 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 work sheet, adding the space of an
adjoining room. If the extra space provides an
unconned 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 Ven-
tilation Air from Outdoors.
C. Install a lower Btu/Hr gas log heater, 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: If the area in
which the rebox and gas log
heater may be operated is
smaller than that dened as
an unconned 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,
ANS Z223.1/NFPA54, Section 5.3
or applicable local codes.
VENTILATION AIR
VentilationAirFromInsideBuilding
This fresh air would come from an adjoining un-
conned space. When ventilating to an adjoining
unconned space, you must provide two perma-
nent openings: one within 12" of the ceiling and
one within 12" of the oor on the wall connecting
the two spaces (see option 1, Figure 3). You can
also remove door into adjoining room (see op-
tion 2, Figure 3). Follow the National Fuel Gas
Code ANS 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
 WARNING: Rework work-
sheet, adding the space of the
adjoiningunconnedspace.The
combined spaces must have
enough fresh air to supply all
appliances in both spaces.
Figure 3 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option
2
Ventilation
Grills
Into Adjoining
Room,
Option 1
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 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 ANS 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 4 - Ventilation Air from Outdoors
Outlet
Air
Ventilated
Attic
Outlet
A
ir
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic

www.desatech.com 105116-01D8
INSTALLATION
NOTICE: This rebox in com-
bination with unvented log
sets are intended for use as
supplemental heat. Use along
with your primary heating
system.Donotinstallthemas
yourprimaryheatsource.Ifyou
haveacentralheatingsystem,
youmayrunsystem’scirculat-
ing blower while using heater.
This will help circulate the heat
throughout the house. In the
event of a power outage, you
can use unvented logs as your
primaryheatsource.
WARNING:A qualiedser-
vicepersonmustinstallrebox.
Follow all local codes.
WARNING: Never install the
rebox
• inabedroomorbathroom
• in a recreational vehicle
• where curtains, furniture,
clothing or other ammable
objectsarelessthan42"from
the front, top or sides of the
rebox
• inhightrafcareas
• in windy or drafty areas
CAUTION: Log heaters
installed in this rebox create
warm air currents. These cur-
rentsmoveheattowallsurfaces
next to rebox. Installing re-
box next to vinyl or cloth wall
coveringsoroperatingrebox
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 gas log heaters add
moisture to the air. Although this is benecial,
installing firebox in rooms without enough
ventilation air may cause mildew to form from
too much moisture. See Air for Combustion and
Ventilation, page 5.
IMPORTANT: Make sure the rebox is level. If
rebox is not level, log set will not work properly.
Note: Your Vanguard rebox is designed to be
used in zero clearance installations. Wall or fram-
ing material can be placed against any exterior
surface on the rear, sides or top of your rebox,
except where standoff spacers are integrally at-
tached. If standoff spacers are attached to your
firebox, these spacers can be placed directly
against wall or framing materials.
Use dimensions shown for rough openings to
create the easiest installation (see Built-In Firebox
Installation, page 9).
INSTALLATION CLEARANCES
WARNING: Maintain the
minimumclearances.Ifyoucan,
providegreaterclearancesfrom
oor,ceilingandadjoiningwall.
Carefully follow the instructions below. This will
ensure safe installation.
MinimumWallandCeilingClearances
A. Clearances from the side of the rebox open-
ing to any combustible wall should not be less
than 8 ".
B. Clearances from the top of the rebox opening
to the ceiling should not be less than 42".
C. When the rebox is installed on carpeting or
other combustible material, other than wood
ooring, the rebox should be installed on a
metal or wood panel extending the full width
and depth of the enclosure.
D. Clearances from the bottom of rebox to the
oor is 0".
CAUTION: Do not install
the rebox directly on carpet
or vinyl.
CAUTION: Useonlytheclear-
ancesspeciedinthismanualor
onthereboxratingplate.

www.desatech.com
105116-01D 9
Figure 5 - Minimum Clearance -
Front View
42" Min.
0" to Wood Floor
8" Min.
0" Min. Clearance to
Upper Frame/Wallboard
Ceiling
4" Min. from the Perpendicular
Side Wall to the Edge of Facial
1/2" Min. Clearance
to Combustibles
44
1
/
4
"
24"
Figure 6 - Minimum Clearance - Top View
Minimum clearances to combustibles are:
• Sides of outer casing 0" min.
• Drywall to sides and top of 0" min.
front face
• Ceiling to opening 42' min.
• Floor (see Minimum Wall 0" min.
and Ceiling Clearances, note C)
• Perpendicular walls 4' min.
Right and Left
• Distance to Facing Walls 36" min.
See Figures 5 and 6.
INSTALLATION
Continued
Mantel Clearances for Built-In
Installation
If placing custom mantel above built-in rebox,
you must meet the minimum allowable clearance
between mantel shelf and top of rebox opening
shown in Figure 7. These are the minimum allowable
mantel clearances for a safe installation. Use larger
clearances wherever possible to minimize the heating
of objects and materials placed on the mantel.
CAUTION: Do not allow the
vent-free gas log heater to touch
or extend beyond the rebox
screen.
If your installation does not meet the above mini-
mum clearances in Figure 7, you must:
• raise the mantel to an acceptable height,
OR
• remove the mantel.
Figure 7 - Minimum Mantel Clearances
for Built-In Installation
Supplied
Firebox Hoods
Must Be Used
at All Times
Wire-mesh
Screen
Firebox Top
Mantel Shelf
3"
6"
9
1
/
4
"
Combustible
Material 1
1
/
2
"
Max Thickness
Note: All vertical
measurements are
from top of fireplace
hood to bottom of
mantel shelf. These
minimum clearances
replace any other
recommended
clearances supplied
with your ANS Z21.11.2
approved gas logs.
Wall board or facing material
(above firebox) may be of
combustible material, including
decorative mantel ornaments
or other similar projections
off of the facing material.
Top Frame
(Combustible Material)
12" 15" 18"
Note: Do not
cover louver
openings.
7" Min.
BUILT-IN FIREBOX INSTALLATION
Built-in installation of this rebox involves installing
rebox into a framed-in enclosure. This makes the
front of rebox ush with wall. Optional perimeter
brass trim accessories are available (see Accessories,
page 18). The brass trim will extend past sides of
rebox approximately 1/2". This will cover the rough
edges of the wall opening. If installing a mantel above
the rebox, you must follow the clearances shown
in Figure 7. Follow the instructions below to install
the rebox in this manner.
1. Frame in rough opening. The rebox framing
should be constructed of 2 x 4 lumber or heavier.
Construct framing using dimensions shown in
Figure 8 and 9, page 10. It is recommended that
the framing be constructed rst and the unit
be placed in position by removing the nailing
anges from one side. After sliding the unit into
place, the outer most anges may be replaced
and nailed to the framing on all sides before
applying the wallboard to the exterior framing.

www.desatech.com 105116-01D10
INSTALLATION
Continued
44
1
/
4
" Min.
40
1
/
4
" Min.
36" Min. to
Facing Wall
22
3
/
4
"
Min.
Facing
Wall
Wallboard
Wallboard
Gas Line
Facing Wall
(Base line)
Note: Gas line
may also be on
opposite side.
Figure 8 - Framing for Built-In Firebox
Installation
1
1
/
2
" Max.
3/8" Max.
4"
8" Min. from
adjacent wall
to fireplace
opening
SAFE
ZONE
Combustible material must
not overlap more than
3/8" onto black metal
front face.
Nailing Flange
Drywall
Figure 9 - Framing for Built-In Firebox
Installation: Top View
Minimum from rebox
edge to combustible
material
Edge
of side
rebox
opening
2. If the vent-free rebox is to be installed directly
on carpeting, tile (other than ceramic) or any
combustible material other than wood ooring;
the vent-free rebox must be installed upon a
metal or wood panel extending the full width
and depth of the vent-free rebox.
3. If a raised platform is to be constructed, ceiling
clearances must be maintained.
4. Install gas piping to rebox location. See In-
stalling Gas Line on page 11 and Connecting
to Gas Supply in log set owner’s manual.
IMPORTANT: If installing blower accessory. See
Hard-Wiring Firebox, page 12.
5. Carefully set rebox in front of rough open-
ing. IMPORTANT: If installing brass trim
kit, see instructions included with brass trim
accessory. You must install shoulder screws
from brass trim kit now.
6. Carefully insert rebox into rough opening.
7. Attach rebox to wall studs using nails or
wood screws through holes in nailing ange
(see Figure 10).
8. If using optional brass trim kit, install the trim
after nal nishing and/or painting of wall.
See instructions included with brass trim ac-
cessory for attaching brass trim.
IMPORTANT: When finishing your firebox,
combustible materials such as wall board, gypsum
board, sheet rock, drywall, plywood, etc. may be
butted up next to the sides and top of the rebox.
Combustible materials should never overlap the
rebox front facing.
WARNING: Do not allow any
combustiblematerialstoover-
lapthereboxfrontfacing(see
Figure9).
IMPORTANT: Noncombustible materials such as
brick, tile, etc. may overlap the front facing, but
should never cover any necessary openings like
louvered slots.
WARNING:Nevermodifyor
cover the louvered slots on the
frontoftherebox.
WARNING:Useonlynoncom-
bustiblemortaroradhesiveswhen
overlapping the front facing with
noncombustiblefacingmaterial.
Figure 10 - Attaching Firebox to Wall Studs
Nailing Flanges
Nails or
Wood
Screws

www.desatech.com
105116-01D 11
INSTALLING GAS LINE
WARNING:A qualiedser-
vicepersonmustconnectheater
to gas supply. Follow all local
codes.
IMPORTANT: See Connecting to Gas Supply in
your log set owner’s manual for details on gas
hookup.
You may run the gas line from either side of the
rebox (see Figure 11). When you have deter-
mined how the gas line will run, locate one of
the recessed knockouts in the rebrick oor (see
Figure 12). Firmly tap the center of the knockout
with a chisel until it is released. Carefully chisel
the rough edges of the hole you have made to
smooth edges. This hole will line up with the hole
in the metal oor.
CAUTION: Do not use exces-
siveforcetoremovetheknock-
out.Toomuchforcemaydamage
therebrickconcreteinsert.
INSTALLATION
Continued
A manual shutoff valve, CSA certied and com-
plying with the National Fuel Gas code, ANS
Z223.1/NFPA 54, must be included within (6') six
feet of the vent-free rebox gas supply system. It
may be convenient to install the gas shutoff outside
the vent-free rebox enclosure where it can be
accessed with a key through a wall as shown in
Figure 13. Depending on the type of installation,
some local codes may require you to install two
(2) manual shutoff valves independently accessible
from both rooms. Check your local codes for ap-
plicable installation requirements.
A 36" long 1/2" NPT SCHD 40 exible gas con-
nector line complying with the National Fuel Gas
code ANS Z223.1/NFPA 54, may be run from the
regulator to the incoming 1/2" NPT black iron
gas line. You may also route the incoming 1/2"
NPT black iron gas line directly to the appliance
regulator.
The incoming gas line may be routed into the vent-
free rebox either from the left or right hand sides
(see Figure 11). Remove the gas line cover plate
from the vent-free rebox’s outer surround at the
location to be used.
Figure 11 - Installing Gas Line and
Manual Shutoff Valve
Manual Shutoff Valve is
Located Under Firebox
Floor on Either Side
Gas Line Installed
Through Access Hole
on One Side of Firebox
Alternative
Gas Line
Location
Figure 12 - Location of Knockouts for
Gas Line
Extension
Key
Shut-Off Valve
Figure 13 - Typical Exterior Wall Gas
Shut-Off Installation
Knockouts
3/4" Thick Liner Remove This Area
Firebrick Floor

www.desatech.com 105116-01D12
If a sediment trap is not incorporated as a part of
the gas utilization equipment, one shall be installed
as close to the inlet of the equipment as practical at
the time of installation, as per ANS Z223.1/NFPA
54. See Figure 14.
Prepare incoming black iron gas line with Teon
tape or pipe joint compound (check with local
codes as to the use of Teon tape). Compounds
used on threaded joints of gas piping shall be
resistant to the action of propane/LP and should
be applied lightly to ensure excess sealant does
not enter the gas line.
Complete your gas installation by connecting
the incoming gas line to the appliance regulator.
Secure all joints tightly with wrench but do not
overtighten. If a exible gas line is used, take care
not to kink the connector.
WARNING: All gas piping
andconnectionsmustbetested
forleaksaftertheinstallationis
completed.Afterensuringthat
themanualshutoffgasvalveis
open, apply a soap and water
solution to all connections and
joints.Ifbubblesappear,leaks
can be detected and corrected.
DO NOT USE OPEN FLAME FOR
LEAK TESTING AND DO NOT
OPERATE ANY APPLIANCE IF
ALEAKISDETECTED.
INSTALLATION
Continued
Figure 14 - Sediment Trap Installation
Incoming 1/2"
Gas Line
Permitted by
Local Codes
Sediment Trap
(Not Supplied)
GAS SUPPLY TESTING
Note: This section is intended as a guide for
qualied technicians installing gas to this vent-
free rebox.
CAUTION: Do not connect
vent-free heater before pressure
testing gas piping. Damage to
gasvalvemayresultandanun-
safeconditionmaybecaused.
The appliance and its’ individual shutoff valve
must be disconnected from the gas supply piping
system during any pressure testing of that system at
test pressures in excess of 1/2 psig (3.5 kPa).
The appliance must be isolated from the gas
supply piping system by closing manual shutoff
valve during any pressure testing of the gas sup-
ply piping system at test pressures equal to or
less than 1/2 psig (3.5 kPa).
HARD-WIRING FIREBOX
Model FBST can be hard-wired to the duplex
outlet located inside the rebox bottom if desired.
This allows the blower accessory to be plugged
into the duplex outlet.
NOTICE:Aqualiedelectrician
mustconnectelectricalwiringto
duplex outlet for built-in instal-
lation. Follow all local codes.
In absence of local codes fol-
low The National Electric Code
ANS/NFPA 70.
ELECTRICAL INSTALLATION
A model GA3500A blower system assembly is
available for use with the FBST vent-free rebox
as an optional accessory. This blower is designed
to be installed on either side of the FBST rebox,
when provisions for a 120 VAC supply connection
are made at either end of the cabinet. Use of a
blower system other than those manufactured by
DESA voids the warranty.
Electrical connections are made within the recep-
tacle with wires that are routed through the bushing
provided (see Figure 15, page 13). The receptacle
may be relocated to either side, when necessary.
However, the cover plate must be replaced over the
unused access point. Be certain to properly ground
the vent-free rebox using the green grounding
wire (see Figure 17 on page 14).

www.desatech.com
105116-01D 13
Figure 15 - Locating Electrical
Connection and Gas Connection on
Either Side of Fireplace
Cover
Plates
Electrical
Connection
Access Hole
Gas Connection
Access Hole
Note: A 120V supply connection to the leads to
the receptacle must be provided for use with the
optional blower kit whether installed during or
after initial rebox installation. You may not be
able to install a supply connection after the nal
installation is completed. Refer to Optional Blower
Assembly Installation for specics.
INSTALLATION
Continued
OPTIONAL BLOWER ASSEMBLY
INSTALLATION
Proper installation of the blower system is required
to insure that the maximum discharge of air can
be delivered through the louvers on each side of
the replace.
Note: You may perform this installation from
either side of the replace within either room. The
lower door panels are removable from both sides
of the rebox for better access.
1. Remove the blower assembly from the pack-
aging and inspect the fan and wiring for dam-
age. If any wiring is loose or damaged, return
the assembly for exchange to your dealer or
distributor.
2. Remove the 2 screws located at the top of the
lower door panel. Slide door panel forward
and up to remove tabs on panel from locating
slots in rebox (see Figure 16).
3. Locate the two strips of hook and loop mounting
strips on one side of the base of the lower com-
partment. Align the mounting strips on blower
with mounting strips on base of rebox.
4. Install blower housing with exhaust outlet
ports directed upwards along inner side wall of
lower compartment. The blower outlets must
be installed ush to the outer cabinet for air
to ow properly.
5. Apply gentle force between hook and loop
mounting strips to seat blower.
6. Remove control knob and lock nut from
blower speed control shaft.
7. Place speed control shaft through 3/8" hole
provided in right side of lower door panel
removed in step 2.
8. While supporting speed control housing, se-
cure shaft in panel hole with lock nut. Place
control knob on shaft.
9. Plug blower power cord into receptacle lo-
cated in lower rebox compartment. Check
to make sure there are no foreign objects in
blower wheel.
WARNING: Never touch the
blower wheel while in operation.
10. Turn blower on and check for proper operation.
11. Turn blower off before continuing.
12. Replace lower door panel by inserting tabs on
bottom of panel into locating slots on rebox.
Push door panel into an upright position and
secure with screws removed in step 2.
Figure 16 - Removing Lower Door Panel
Locating
Holes
Door Panel
Locating Slot
Locating
Slot

www.desatech.com 105116-01D14
Figure 17 - Optional Blower Wiring
Diagram
INSTALLATION
Continued
HEAT DEFLECTIVE HOOD
INSTALLATION
The factory supplied heat deective hoods must
be installed inside the replace opening on both
sides for the safe operation of the unit as shown
in Figure 19.
1. Remove protective covering from hoods.
2. Position deective hood into opening on one
side of the rebox and secure to the top of the
opening using screws provided.
3. Secure the ends of the hood to the rebox
using two screws (provided) for each side.
4. Repeat steps 2 and 3 to install hood on the
opposite side of the rebox.
CAUTION: Do not clean hood
with abrasive cleanser. Use only
regular household cleaners and
asmoothcloth.
Blower
Receptacle
Hook and Loop
Mounting Strips
Control
Knob
Lock
Nut
Speed
Control
Shaft
Figure 18 - Installing Optional Blower
GA3500A
Operating Optional Blower GA3500A
Light your gas appliance with the blower off. After
about 10 minutes, turn the blower on to deliver
heated air out the top louvers. The blower features
a variable control which allows you to select the
blower speed you desire.
Note: Periodically check the louvers of the rebox
and remove any dust, dirt or obstructions.
Figure 19 - Typical Hood Installation
(Both Sides)
2 Screws Each
End of Hood
Corner
Post
Front Hood
(Typical Each Side)
3 Screws
(Top)
INCOMING
120V AC
(FUSE BOX
OR
BREAKER)
BLK BLK
GRN
GRN
WHT WHT
FIELD WIRE
GND
CONNECTORS (NOT SUPPLIED)
VARIABLE
SPEED
CONTROL
BLOWER
RECEPTACLE
ELECTRICAL RATING:
120v, 60Hz, 0.9A
Note: If any of the original wire must be replaced, it must be replaced with type TEW minimum 16GA copper wire rated at 105C

www.desatech.com
105116-01D 15
OPERATING GUIDELINES
AND MAINTENANCE
INSTRUCTIONS
When lit for the rst time, a vent-free log heater will
emit a slight odor for about an hour or two. This is
a normal occurrence which is due to the “curing”
of the logs and the “burn-in” of internal paints and
lubricants used in the manufacturing process.
Keep control compartments, logs, burners and
areas surrounding the logs clean by vacuuming or
brushing at least twice a year. Temporary removal
of the log set may ease the cleaning of the burner
and pilot assembly. In cleaning, take care not to
alter the settings on the pilot assembly. See the
operating instructions supplied with your vent-free
log heater for additional cleaning instructions.
WARNING: Logs can be very
hot! Allow logs to cool before
handling.
IMPORTANT: Turn off the gas supply at the exter-
nal shutoff valve before servicing appliance. Any
safety screen or guard removed for servicing must
be replaced prior to operating the appliance.
Installation and repair should be done by a quali-
ed person. The appliance should be inspected
before use and at least annually by a professional
service person. More frequent cleaning may be
required due to excessive lint from carpeting, pet
hair, etc. It is imperative that the control compart-
ments, burners and circulating air passageways of
the appliance be kept clean.
WARNING: Children and
adults should be alerted to the
hazardsofhighsurfacetempera-
tures and to stay away to avoid
burnsor clothingignition.Young
children should be carefully
supervised when they are in the
sameroomastheappliance.
For lighting and operating this vent-free rebox,
please refer to the vent-free gas logs manufactur-
er’s instruction manual.
REPLACEMENT PARTS
Note: Use only original replacement parts. This
will protect your warranty coverage for parts
replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product. If they
can’t supply original replacement part(s), call
DESA at 1-866-672-6040.
When calling DESA, have ready
• your name
• your address
• model and serial numbers of your rebox
• how rebox was malfunctioning
• type of gas used (propane/LP or natural gas)
• purchase date
Usually, we will ask you to return the defective
part to the factory.
PARTS NOT UNDER WARRANTY
Contact authorized dealers of this product. If
they can’t supply original replacement part(s),
call DESA at 1-866-672-6040 for referral infor-
mation.
When calling DESA, have ready
• model number of your rebox
• the replacement part number
Note: The rebox identication label (including
model number, serial number, clearances, etc.) is
located above the brick liner and under the heat
shield. See Figure 20.
Figure 20 - Location of Firebox
Identication Label
Air Deector
Identication Label
Brick Liner
Heat Shield

www.desatech.com 105116-01D16
ILLUSTRATED PARTS BREAKDOWN
MODEL FBST
**These items are used on both sides of fireplace.
8**
14
16**
16**
16**
7-1
7-2
2
16**
11**
16**
12
6
6
6
15
15
15
15
13 13
10**
5**
15
15
15
15
6
6
15
15
4
15
15
15
15 15
15
15
4
14
14
16**
16**
8**
16**
16**
7-1
9**
15
1
3

www.desatech.com
105116-01D 17
PARTS LIST
MODEL FBST
This list contains replaceable parts used in your rebox. When ordering parts, follow the instructions
listed under Replacement Parts on page 15 of this manual.
KEY
NO. PART NO. DESCRIPTION QTY.
1 *** Firebox Assembly 1
2 *** Firebox Bottom 1
3 *** Firebox Top 1
4 23982 Top Spacer 4
5 26731 Deector Hood 2
6 26740 Nailing Flange 8
7-1 02013 Side Refractory Brick Liner 2
7-2 02014 Bottom Refractory Brick Liner 2
8 24007 Side Refractory Retainer 4
9 12125 Screen 4
10 26752 Extruded Louver 2
11 26733 Lower Door Panel 2
12 14200 Receptacle 1
13 21171 Access Hole Cover 6
14 099230-01 Shoulder Screws 14
15 11164 Screw, #10 x 1/2, zinc PH 24
16 11165 Screw, #10 x 5/8, zinc PH 46
PARTS AVAILABLE - NOT SHOWN
55473 Installation Instructions 1
26544 Rating Plate Label 1
***Not a eld replaceable part.

www.desatech.com 105116-01D18
TECHNICAL SERVICE
You may have further questions about installation,
operation or troubleshooting. If so, contact DESA
at 1-866-672-6040.
You can also visit DESA Technical Service web
site at www.desatech.com.
ACCESSORIES
Purchase these rebox accessories from your local
dealer. If they can not supply these accessories, call
DESA at 1-866-672-6040 for information. You can
also write to the address listed on the back page
of this manual.
BLOWER - GA3500A
An optional blower is available for use with the
FBST reboxes for bidirectional heat circula-
tion and may be installed during or after rebox
installation.
BRASS TRIM - GA6093
Easily clips around rebox to provide a nished
appearance covering rough and or unfinished
mantel edges. Note: Kit is for one side of rebox
only. Two kits are required to do both sides of
replace.
POLISHEDBRASSHOOD-GA6054
Replaces the standard black hood to provide a
more formal appearance. Note: Kit is for one side
of rebox only. Two kits are required to do both
sides of replace.
POLISHEDBRASSLOUVER-GBL41
Replaces the standard black louver to provide a
more formal appearance. Note: Kit is for one side
of rebox only. Two kits are required to do both
sides of replace.

www.desatech.com
105116-01D 19
NOTES
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LIMITED WARRANTY
VENT-FREE FIREBOX
DESA warrants this product to be free from defects in materials and components for four (4) years from the date
of rst purchase, provided that the product has been properly installed, operated and maintained in accordance
with all applicable instructions. To make a claim under this warranty the Bill of Sale or cancelled check must
be presented.
This warranty is extended only to the original retail purchaser. This warranty covers the cost of part(s) required to
restore this heater to proper operating condition and an allowance for labor when provided by a DESAAuthorized
Service Center. Warranty part(s) MUST be obtained through authorized dealers of this product and/or DESA who
will provide original factory replacement parts. Failure to use original factory replacement parts voids this war-
ranty. The heater MUST be installed by a qualied installer in accordance with all local codes and instructions
furnished with the unit.
This warranty does not apply to parts that are not in original condition because of normal wear and tear or parts
that fail or become damaged as a result of misuse, accidents, lack of proper maintenance or defects caused by
improper installation. Travel, diagnostic cost, labor, transportation and any and all such other costs related to
repairing a defective heater will be the responsibility of the owner.
TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE SALE
OF THE PRODUCT; THIS EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EXPRESSED
WARRANTIES AND LIMITS THE DURATION OF ANY AND ALL IMPLIED WARRANTIES, INCLUDING
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE TO FOUR (4)
YEARS ON ALL COMPONENTS FROM THE DATE OF FIRST PURCHASE; AND DESA’S LIABILITY IS
HEREBY LIMITED TO THE PURCHASE PRICE OF THE PRODUCT AND DESA HEATING PRODUCTS
SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING INDIRECT, INCI-
DENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow a limitation on how long an implied warranty lasts or an exclusion or limitation of
incidental or consequential damages, so the above limitation on implied warranties or exclusion or limitation on
damages may not apply to you.
This warranty gives you specic legal rights and you may also have other rights that vary from state to state.
For information about this warranty write:
2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
www.desatech.com
105116-01
Rev. D
10/05
NOT A UPC
105116 01
WARRANTY INFORMATION
KEEP THIS WARRANTY
Model
Serial No.
Date Purchased
Always specify model and serial numbers when communicating with the factory.
We reserve the right to amend these specications at any time without notice. The only warranty applicable is our
standard written warranty. We make no other warranty, expressed or implied.