Vanguard Fire Pit FBST User Manual

®
UNVENTED (VENT-FREE) LogMate® UNiVERSaL FiREBOX  
OWNER’S OPERaTiON aND iNSTaLLaTiON MaNUaL  
MODEL FBST  
36" See-Thru Heat-Circulating Firebox  
WARNING: If the information in these instructions is  
not followed exactly, a fire or explosion may result  
causing property damage, personal injury or death.  
FOR YOUR SAFETY  
— Do not store or use gasoline or any other flammable  
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.  
• Immediatelycallyourgassupplierfromaneighbor’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.  
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SaFETy iNFORMaTiON  
Carefully supervise young chil-  
dren when they are in the room  
with firebox.  
IMPORTANT: Read this owner’s  
manual carefully and completely  
beforetryingtoassemble,operate  
or service this firebox. Improper  
use of this firebox can cause se-  
rious injury or death from burns,  
fire,explosion,electricalshockor  
carbon monoxide poisoning.  
You must operate this fireplace  
with the provided fireplace  
screen, hood and brick liner in  
place. Make sure these parts  
are in place and screens are  
closed before running firebox.  
The supplied hoods may not be  
replaced with hoods which may  
be provided with a log heater.  
CAUTION: Carefully review  
the instructions supplied with  
the decorative type unvented  
room heater for the minimum  
firebox size requirement. Do not  
install the appliance in this fire-  
boxunlessthisreboxmeetsthe  
minimum dimensions required  
for the installation.  
Keep the appliance area clear  
and free from combustible ma-  
terials, gasoline and other flam-  
mable vapors and liquids.  
1. This firebox shall not be installed in a bedroom  
or bathroom.  
2. Never install the firebox  
• in a recreational vehicle  
WARNING: Any change to  
this firebox or its controls can  
be dangerous.  
• where curtains, furniture, clothing or other  
flammable objects are less than 42" from the  
front, top or sides of the firebox  
• in high traffic areas  
• in windy or drafty areas  
WARNING:Donotuseablow-  
er insert, heat exchanger insert  
orotheraccessorynotapproved  
for use with this firebox.  
3. Do not use this firebox as a wood-burning  
fireplace. 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.  
Donotallowfanstoblowdirectly  
intotherebox.Avoidanydrafts  
that alter burner flame patterns.  
Ceiling fans can create drafts  
that alter burner flame patterns.  
Altered burner patterns can  
cause sooting.  
5. Use only the provided hoods or appropriate  
polished brass hood accessories. See Acces-  
sories on page 18.  
6. Vent-freegaslogheatersinstalledinthisrebox  
require fresh air ventilation to run properly. See  
Air for Combustion and Ventilation, page 5.  
7. Do not run firebox  
• where flammable liquids or vapors are used  
or stored  
• under dusty conditions  
Firebox front and screen be-  
comes very hot when running  
firebox.Keepchildrenandadults  
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.  
8. Do not use this firebox to cook food or burn  
paper or other objects.  
9. Never place any objects in firebox or on logs.  
10. Turn firebox off and let cool before servicing.  
Only a qualified service person should service  
and repair firebox.  
11. Operatingvent-freelogsinareboxaboveeleva-  
tions of 4,500 feet could cause pilot outage.  
105116-01D  
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BLOWER ACCESSORY  
SaFETy iNFORMaTiON  
The FBST firebox 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 firebox into the room. Use of  
blower is optional.  
Continued  
12. Do not use the firebox 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.  
BRICK LINER  
This firebox 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 firebox or  
vent-free gas logs.  
LOCaL CODES  
Install and use firebox 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).  
PRODUCT  
SPECiFiCaTiONS  
*Available from:  
1 1/4"  
American National Standards Institute, Inc.  
1430 Broadway  
New York, NY 10018  
24"  
1/2"  
National Fire Protection Association, Inc.  
Batterymarch Park  
Quincy, MA 02269  
5/8"  
UNPaCkiNg  
1. Remove all protective packaging from inside  
firebox. Carefully lift the firebox off the bot-  
tom corrugated tray.  
4 1/4"  
1 3/4"  
3" TYP.  
2. Carton should contain 2 deflective hoods  
and hardware packet in addition to firebox  
assembly. If items are missing, inform dealer  
where you bought firebox.  
20 1/2"  
40"  
18 1/2"  
36 1/4"  
3. Check all items for any shipping damage. If  
damaged, promptly inform dealer where you  
bought firebox.  
9 1/8"  
36 1/2"  
42 1/2"  
44 1/4"  
NOTICE: The firebox identifica-  
tion label (including model num-  
ber, serial number, clearances,  
etc.) is located directly above  
thebricklinerandundertheheat  
shield. See Figure 20, page 15.  
3 5/8"  
4"  
PRODUCT FEaTURES  
OpERATION  
19 1/2"  
This firebox is designed for use with approvedANS  
Z21.11.2 decorative type unvented room heaters.  
(Physical size limitations apply. Refer to minimum  
firebox requirements supplied with log heater.) It  
requires no outside venting or chimney making in-  
stallation easy and inexpensive. When used without  
the blower, the firebox requires no electricity mak-  
ing it ideal for emergency backup heat.  
5 1  
/
5
2 1/4"  
12"  
Figure 1 - Dual-Sided Firebox  
4
105116-01D  
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LOCaTiNg FiREBOX  
pLANNING  
Plan where you will install the firebox. This will  
save time and money later when you install the fire-  
box. Before installation, consider the following:  
aiR FOR COMBUSTiON  
aND VENTiLaTiON  
WARNING:Thisreboxshall  
not be installed in a confined  
space or unusually tight con-  
struction unless provisions are  
provided for adequate combus-  
tionandventilationair. Readthe  
following instructions to insure  
proper fresh air for this and  
other fuel-burning appliances  
in your home.  
1. Where the firebox 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.  
Today’s homes are built more energy efficient  
than ever. New materials, increased insulation and  
new construction methods help reduce heat loss  
in homes. Home owners weather strip and caulk  
around windows and doors to keep the cold air out  
and the warm air in. During heating months, home  
owners want their homes as airtight as possible.  
6. Alocation that minimizes modifications on ex-  
isting framing will make installation easier.  
Projected installations can extend any dis-  
tance into the room.Aprojection may be ideal  
as a partition between two otherwise common  
areas when added to an existing, finished wall  
(see Figure 2).  
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.  
Internal wall installation provides a discreet  
viewing option between two adjacent rooms or  
within an added wall to subdivide an oversize  
room.  
Exhaust fans, fireboxes, 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 classifications:  
1. Unusually Tight Construction  
2. Unconfined Space  
Figure 2 - Projected Installation  
3. Confined 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.  
105116-01D  
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DETERMINING FRESH-AIR FLOW  
FOR FIREBOx LOCATION  
aiR FOR COMBUSTiON  
aND VENTiLaTiON  
Determining if You Have a Confined or  
Unconfined Space  
Use this work sheet to determine if you have a  
Continued  
Unusually tight construction is defined as con-  
struction where:  
confined or unconfined space.  
a. walls and ceilings exposed to the outside  
atmosphere have a continuous water vapor  
retarder with a rating of one perm (6 x 10-  
Space: Includes the room in which you will install  
heater plus any adjoining rooms with doorless  
passageways or ventilation grills between the  
rooms.  
11  
kg per pa-sec-m2) or less with openings  
gasketed or sealed and  
1. Determine the volume of the space (length x  
width x height).  
b. weather stripping has been added on open-  
able windows and doors and  
Length x Width x Height =__________cu. ft.  
(volume of space)  
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.  
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.  
If your home meets all of the three criteria  
above, you must provide additional fresh air.  
See Ventilation Air From Outdoors, page 7.  
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)  
If your home does not meet all of the three cri-  
teria above, proceed to Determining Fresh-Air  
Flow for Firebox Location.  
Example: 3168 cu. ft. (volume of space) x 20 =  
63,360 (maximum Btu/Hr the space can support)  
Confined and Unconfined Space  
3. Add the Btu/Hr of all fuel burning appliances in  
the space.  
The National Fuel Gas Code ANS Z223.1/NFPA  
54 defines a confined space as a space whose  
volume is less than 50 cubic feet per 1,000 Btu  
per hour (4.8 m3 per kw) of the aggregate input  
rating of all appliances installed in that space and  
an unconfined space as a space whose volume is  
not less than 50 cubic feet per 1,000 Btu per hour  
(4.8 m3 per kw) of the aggregate input rating of  
all appliances installed in that space. Rooms com-  
municating directly with the space in which the  
appliances are installed*, through openings not  
furnished with doors, are considered a part of the  
unconfined space.  
Gas water heater*  
Gas furnace  
_____________Btu/Hr  
_____________Btu/Hr  
_____________Btu/Hr  
_____________Btu/Hr  
Vented gas heater  
Gas fireplace logs  
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:  
40,000  
_____________Btu/Hr  
39,000  
+____________Btu/Hr  
79,000  
=____________Btu/Hr  
Gas water heater  
Gas firebox logs  
Total  
This heater shall not be installed in a confined  
space or unusually tight construction unless provi-  
sions are provided for adequate combustion and  
ventilation air.  
4. Compare the maximum Btu/Hr the space can  
support with the actual amount of Btu/Hr used.  
* Adjoining rooms are communicating only if  
there are doorless passageways or ventilation grills  
between them.  
_________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)  
6
105116-01D  
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aiR FOR COMBUSTiON  
WARNING: Rework work-  
sheet, adding the space of the  
adjoiningunconfinedspace.The  
combined spaces must have  
enough fresh air to supply all  
appliances in both spaces.  
aND VENTiLaTiON  
Continued  
The space in the above example is a confined  
space because the actual Btu/Hr used is more than  
the maximum Btu/Hr the space can support. You  
must provide additional fresh air. Your options  
are as follows:  
A. Rework work sheet, adding the space of an  
adjoining room. If the extra space provides an  
unconfined space, remove door to adjoining  
room or add ventilation grills between rooms.  
See Ventilation Air from Inside Building.  
Ventilation  
Grills  
Into Adjoining  
Or  
Room,  
Remove  
Option 1  
Door into  
B. Vent room directly to the outdoors. See Ven-  
tilation Air from Outdoors.  
Adjoining  
Room,  
Option  
2
C. Install a lower Btu/Hr gas log heater, if lower  
Btu/Hr size makes room unconfined.  
If the actual Btu/Hr used is less than the maxi-  
mum Btu/Hr the space can support, the space is  
an unconfined space. You will need no additional  
fresh air ventilation.  
Figure 3 - Ventilation Air from Inside  
Building  
WARNING: If the area in  
which the firebox and gas log  
heater may be operated is  
smaller than that defined as  
an unconfined space or if the  
building is of unusually tight  
construction, provide adequate  
combustion and ventilation air  
byoneofthemethodsdescribed  
in the National Fuel Gas Code,  
ANSZ223.1/NFPA54,Section5.3  
or applicable local codes.  
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 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.  
VENTILATION AIR  
Ventilated  
Outlet  
Attic  
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 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.  
Outlet  
Air  
To Attic  
To  
Crawl  
Space  
Inlet  
Air  
Ventilated  
Inlet Air  
Crawl Space  
Figure 4 - Ventilation Air from Outdoors  
105116-01D  
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IMPORTANT: Vent-free gas log heaters add  
moisture to the air. Although this is beneficial,  
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.  
iNSTaLLaTiON  
NOTICE: This firebox 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.  
IMPORTANT: Make sure the firebox is level. If  
firebox is not level, log set will not work properly.  
Note: Your Vanguard firebox 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 firebox,  
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: A qualified ser-  
vice person must installrebox.  
Follow all local codes.  
WARNING: Maintain the  
minimum clearances. If you can,  
provide greater clearances from  
floor, ceiling and adjoining wall.  
WARNING: Never install the  
firebox  
Carefully follow the instructions below. This will  
ensure safe installation.  
• in a bedroom or bathroom  
• in a recreational vehicle  
• where curtains, furniture,  
clothing or other flammable  
objects are less than 42" from  
the front, top or sides of the  
firebox  
Minimum Wall and Ceiling Clearances  
A. Clearances from the side of the firebox open-  
ing to any combustible wall should not be less  
than 8 ".  
B. Clearances from the top of the firebox opening  
to the ceiling should not be less than 42".  
• in high traffic areas  
• in windy or drafty areas  
C. When the firebox is installed on carpeting or  
other combustible material, other than wood  
flooring, the firebox should be installed on a  
metal or wood panel extending the full width  
and depth of the enclosure.  
CAUTION: Log heaters  
installed in this firebox create  
warm air currents. These cur-  
rentsmoveheattowallsurfaces  
next to firebox. Installing fire-  
box next to vinyl or cloth wall  
coverings or operating firebox  
where impurities (such as, but  
not limited to, tobacco smoke,  
aromatic candles, cleaning flu-  
ids, oil or kerosene lamps, etc.)  
in the air exist, may discolor  
walls or cause odors.  
D. Clearances from the bottom of firebox to the  
floor is 0".  
CAUTION: Do not install  
the firebox directly on carpet  
or vinyl.  
CAUTION:Useonlytheclear-  
ancesspecifiedinthismanualor  
on the firebox rating plate.  
8
105116-01D  
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iNSTaLLaTiON  
CAUTION: Do not allow the  
vent-freegaslogheatertotouch  
or extend beyond the firebox  
screen.  
Continued  
Minimum clearances to combustibles are:  
Sides of outer casing  
0" min.  
0" min.  
Drywall to sides and top of  
front face  
If your installation does not meet the above mini-  
mum clearances in Figure 7, you must:  
Ceiling to opening  
42' min.  
0" min.  
raise the mantel to an acceptable height,  
Floor (see Minimum Wall  
and Ceiling Clearances, note C)  
OR  
Perpendicular walls  
Right and Left  
4' min.  
remove the mantel.  
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.  
Distance to Facing Walls  
36" min.  
See Figures 5 and 6.  
0" Min. Clearance to  
Upper Frame/Wallboard  
Mantel Shelf  
Top Frame  
(Combustible Material)  
Ceiling  
8" Min.  
42" Min.  
9 1/4"  
6"  
3"  
Combustible  
Material 1 1/2"  
Max Thickness  
Firebox Top  
15" 18"  
12"  
Note: Do not  
7" Min. cover louver  
openings.  
0" to Wood Floor  
Note: All vertical  
measurements are  
from top of fireplace  
hood to bottom of  
mantel shelf. These  
minimum clearances  
replace any other  
recommended  
Wire-mesh  
Screen  
Figure 5 - Minimum Clearance -  
Front View  
Supplied  
Firebox Hoods  
Must Be Used  
at All Times  
clearances supplied  
with your ANS Z21.11.2  
approved gas logs.  
1/2" Min. Clearance  
to Combustibles  
Figure 7 - Minimum Mantel Clearances  
for Built-In Installation  
24"  
BUILT-IN FIREBOx INSTALLATION  
Built-ininstallationofthisreboxinvolvesinstalling  
firebox into a framed-in enclosure. This makes the  
front of firebox flush with wall. Optional perimeter  
brasstrimaccessoriesareavailable(seeAccessories,  
page 18). The brass trim will extend past sides of  
fireboxapproximately1/2".Thiswillcovertherough  
edgesofthewallopening.Ifinstallingamantelabove  
the firebox, you must follow the clearances shown  
in Figure 7. Follow the instructions below to install  
the firebox in this manner.  
44 1/4"  
4" Min. from the Perpendicular  
Side Wall to the Edge of Facial  
Figure 6 - Minimum Clearance - Top View  
Mantel Clearances for Built-In  
Installation  
If placing custom mantel above built-in firebox,  
you must meet the minimum allowable clearance  
between mantel shelf and top of firebox opening  
showninFigure7.Thesearetheminimumallowable  
mantel clearances for a safe installation. Use larger  
clearanceswhereverpossibletominimizetheheating  
of objects and materials placed on the mantel.  
1. Frame in rough opening. The firebox 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 first and the unit  
be placed in position by removing the nailing  
flanges from one side.After sliding the unit into  
place, the outer most flanges may be replaced  
and nailed to the framing on all sides before  
applying the wallboard to the exterior framing.  
105116-01D  
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7. Attach firebox to wall studs using nails or  
wood screws through holes in nailing flange  
(see Figure 10).  
iNSTaLLaTiON  
Continued  
2. If the vent-free firebox is to be installed directly  
on carpeting, tile (other than ceramic) or any  
combustible material other than wood flooring;  
the vent-free firebox must be installed upon a  
metal or wood panel extending the full width  
and depth of the vent-free firebox.  
8. If using optional brass trim kit, install the trim  
after final finishing 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 firebox.  
Combustible materials should never overlap the  
firebox front facing.  
3. If a raised platform is to be constructed, ceiling  
clearances must be maintained.  
4. Install gas piping to firebox 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.  
WARNING: Do not allow any  
combustible materials to over-  
lap the firebox front facing (see  
Figure 9).  
5. Carefully set firebox 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.  
IMPORTANT: Noncombustible materials such as  
brick, tile, etc. may overlap the front facing, but  
should never cover any necessary openings like  
louvered slots.  
6. Carefully insert firebox into rough opening.  
22 3/4"  
Min.  
WARNING: Never modify or  
cover the louvered slots on the  
front of the firebox.  
Wallboard  
Note: Gas line  
may also be on  
Gas Line  
opposite side.  
WARNING:Useonlynoncom-  
bustiblemortaroradhesiveswhen  
overlapping the front facing with  
noncombustible facing material.  
Facing  
Wall  
44 1/4" Min.  
Wallboard  
Facing Wall  
(Base line)  
40 1/4" Min.  
36" Min. to  
Facing Wall  
Nails or  
Wood  
Screws  
Figure 8 - Framing for Built-In Firebox  
Installation  
Combustible material must  
not overlap more than  
3/8" onto black metal  
front face.  
Edge  
Nailing Flange  
Drywall  
of side  
firebox  
opening  
3/8" Max.  
SAFE  
ZONE  
11/2" Max.  
Minimum from firebox  
edge to combustible  
material  
4"  
8" Min. from  
adjacent wall  
to fireplace  
opening  
Nailing Flanges  
Figure 9 - Framing for Built-In Firebox  
Installation: Top View  
Figure 10 - Attaching Firebox to Wall Studs  
10  
105116-01D  
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A manual shutoff valve, CSA certified 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 firebox gas supply system. It  
may be convenient to install the gas shutoff outside  
the vent-free firebox 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.  
iNSTaLLaTiON  
Continued  
INSTALLING GAS LINE  
WARNING: A qualified ser-  
vicepersonmustconnectheater  
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.  
A 36" long 1/2" NPT SCHD 40 flexible 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.  
You may run the gas line from either side of the  
firebox (see Figure 11). When you have deter-  
mined how the gas line will run, locate one of  
the recessed knockouts in the firebrick floor (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 floor.  
The incoming gas line may be routed into the vent-  
free firebox either from the left or right hand sides  
(see Figure 11). Remove the gas line cover plate  
from the vent-free firebox’s outer surround at the  
location to be used.  
CAUTION:Donotuseexces-  
sive force to remove the knock-  
out.Toomuchforcemaydamage  
the firebrick concrete insert.  
Firebrick Floor  
Gas Line Installed  
Through Access Hole  
on One Side of Firebox  
Knockouts  
Remove This Area  
3/4" Thick Liner  
Figure 12 - Location of Knockouts for  
Gas Line  
Shut-Off Valve  
Extension  
Key  
Manual Shutoff Valve is  
Located Under Firebox  
Floor on Either Side  
Alternative  
Gas Line  
Location  
Figure 11 - Installing Gas Line and  
Manual Shutoff Valve  
Figure 13 - Typical Exterior Wall Gas  
Shut-Off Installation  
105116-01D  
11  
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GAS SUppLY TESTING  
iNSTaLLaTiON  
Note: This section is intended as a guide for  
qualified technicians installing gas to this vent-  
free firebox.  
Continued  
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.  
CAUTION: Do not connect  
vent-freeheaterbeforepressure  
testing gas piping. Damage to  
gas valve may result and an un-  
safe condition may be caused.  
Prepare incoming black iron gas line with Teflon  
tape or pipe joint compound (check with local  
codes as to the use of Teflon 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.  
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).  
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 flexible gas line is used, take care  
not to kink the connector.  
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).  
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.  
DONOTUSEOpENFLAMEFOR  
LEAK TESTING AND DO NOT  
OpERATE ANY AppLIANCE IF  
A LEAK IS DETECTED.  
HARD-WIRING FIREBOx  
Model FBST can be hard-wired to the duplex  
outlet located inside the firebox bottom if desired.  
This allows the blower accessory to be plugged  
into the duplex outlet.  
NOTICE: A qualified electrician  
mustconnectelectricalwiringto  
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 firebox  
as an optional accessory. This blower is designed  
to be installed on either side of the FBST firebox,  
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.  
Incoming 1/ꢀ"  
Gas Line  
Permitted by  
Local Codes  
Sediment Trap  
(Not Supplied)  
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 firebox using the green grounding  
wire (see Figure 17 on page 14).  
Figure 14 - Sediment Trap Installation  
1ꢀ  
105116-01D  
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4. Install blower housing with exhaust outlet  
ports directed upwards along inner side wall of  
lower compartment. The blower outlets must  
be installed flush to the outer cabinet for air  
to flow properly.  
iNSTaLLaTiON  
Continued  
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 firebox installation. You may not be  
able to install a supply connection after the final  
installation is completed. Refer to Optional Blower  
Assembly Installation for specifics.  
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.  
Gas Connection  
Access Hole  
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 firebox compartment. Check  
to make sure there are no foreign objects in  
blower wheel.  
Electrical  
Connection  
Access Hole  
Cover  
Plates  
WARNING: Never touch the  
blower wheel while in operation.  
10. Turn blower on and check for proper operation.  
11. Turn blower off before continuing.  
Figure 15 - Locating Electrical  
Connection and Gas Connection on  
Either Side of Fireplace  
12. Replace lower door panel by inserting tabs on  
bottom of panel into locating slots on firebox.  
Push door panel into an upright position and  
secure with screws removed in step 2.  
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 fireplace.  
Locating  
Slot  
Locating  
Holes  
Note: You may perform this installation from  
either side of the fireplace within either room. The  
lower door panels are removable from both sides  
of the firebox 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.  
Door Panel  
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 firebox (see Figure 16).  
Locating Slot  
Figure 16 - Removing Lower Door Panel  
3. Locatethetwostripsofhookandloopmounting  
strips on one side of the base of the lower com-  
partment. Align the mounting strips on blower  
with mounting strips on base of firebox.  
105116-01D  
13  
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Receptacle  
iNSTaLLaTiON  
Continued  
Blower  
Speed  
Control  
Shaft  
Hook and Loop  
Mounting Strips  
Lock  
Nut  
Control  
Knob  
Figure 18 - Installing Optional Blower  
GA3500A  
HEAT DEFLECTIVE HOOD  
INSTALLATION  
The factory supplied heat deflective hoods must  
be installed inside the fireplace opening on both  
sides for the safe operation of the unit as shown  
in Figure 19.  
1. Remove protective covering from hoods.  
2. Position deflective hood into opening on one  
side of the firebox and secure to the top of the  
opening using screws provided.  
3. Secure the ends of the hood to the firebox  
using two screws (provided) for each side.  
4. Repeat steps 2 and 3 to install hood on the  
opposite side of the firebox.  
CAUTION:Donotcleanhood  
withabrasivecleanser.Useonly  
regularhouseholdcleanersand  
a smooth cloth.  
Figure 17 - Optional Blower Wiring  
Diagram  
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.  
Front Hood  
(Typical Each Side)  
Corner  
Post  
Note: Periodically check the louvers of the firebox  
and remove any dust, dirt or obstructions.  
3 Screws  
(Top)  
2 Screws Each  
End of Hood  
Figure 19 - Typical Hood Installation  
(Both Sides)  
14  
105116-01D  
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OPERaTiNg gUiDELiNES  
aND MaiNTENaNCE  
iNSTRUCTiONS  
REPLaCEMENT PaRTS  
Note: Use only original replacement parts. This  
will protect your warranty coverage for parts  
replaced under warranty.  
When lit for the first 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.  
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.  
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.  
When calling DESA, have ready  
your name  
your address  
model and serial numbers of your firebox  
how firebox 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.  
WARNING:Logscanbevery  
hot! Allow logs to cool before  
handling.  
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.  
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.  
When calling DESA, have ready  
model number of your firebox  
Installation and repair should be done by a quali-  
fied 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.  
the replacement part number  
Note: The firebox identification label (including  
model number, serial number, clearances, etc.) is  
located above the brick liner and under the heat  
shield. See Figure 20.  
Air Deflector  
Heat Shield  
Identification Label  
WARNING: Children and  
adults should be alerted to the  
hazardsofhighsurfacetempera-  
tures and to stay away to avoid  
burnsorclothingignition.Young  
children should be carefully  
supervised when they are in the  
same room as the appliance.  
For lighting and operating this vent-free firebox,  
please refer to the vent-free gas logs manufactur-  
er’s instruction manual.  
Brick Liner  
Figure 20 - Location of Firebox  
Identification Label  
105116-01D  
15  
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iLLUSTRaTED PaRTS BREakDOWN  
MODEL FBST  
15  
4
15  
10**  
15  
15  
3
16**  
15  
15  
15  
14  
15  
14  
15  
16**  
15  
15  
15  
4
6
1
6
15  
15  
6
16**  
15  
14  
6
16**  
15  
11**  
16**  
13  
13  
15  
7-1  
6
12  
**  
16**  
7-2  
7-1  
2
16**  
16**  
16**  
15  
8**  
9**  
**These items are used on both sides of fireplace.  
16  
105116-01D  
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PaRTS LiST  
MODEL FBST  
This list contains replaceable parts used in your firebox. When ordering parts, follow the instructions  
listed under Replacement Parts on page 15 of this manual.  
KEY  
NO.  
pART NO.  
***  
DESCRIpTION  
QTY.  
1
1
1
Firebox Assembly  
Firebox Bottom  
***  
3
***  
Firebox Top  
1
4
5
6
ꢀ3ꢂ8ꢀ  
ꢀ6ꢁ31  
ꢀ6ꢁ40  
Top Spacer  
Deflector Hood  
Nailing Flange  
4
8
ꢁ-1 0ꢀ013  
ꢁ-ꢀ 0ꢀ014  
ꢀ400ꢁ  
Side Refractory Brick Liner  
Bottom Refractory Brick Liner  
Side Refractory Retainer  
Screen  
4
4
8
1ꢀ1ꢀ5  
10  
11  
1ꢀ  
13  
14  
15  
16  
ꢀ6ꢁ5ꢀ  
ꢀ6ꢁ33  
14ꢀ00  
ꢀ11ꢁ1  
Extruded Louver  
Lower Door Panel  
Receptacle  
1
6
14  
ꢀ4  
46  
Access Hole Cover  
0ꢂꢂꢀ30-01 Shoulder Screws  
11164  
11165  
Screw, #10 x 1/2, zinc PH  
Screw, #10 x 5/8, zinc PH  
pARTS AVAILABLE - NOT SHOWN  
Installation Instructions  
554ꢁ3  
ꢀ6544  
1
1
Rating Plate Label  
***Not a field replaceable part.  
105116-01D  
1ꢁ  
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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.  
POLISHED BRASS HOOD - GA6054  
Replaces the standard black hood to provide a  
more formal appearance. Note: Kit is for one side  
of firebox only. Two kits are required to do both  
sides of fireplace.  
aCCESSORiES  
Purchase these firebox accessories from your local  
dealer. If they can not supply these accessories, call  
DESAat 1-866-672-6040 for information.You can  
also write to the address listed on the back page  
of this manual.  
POLISHED BRASS LOUVER - GBL41  
Replaces the standard black louver to provide a  
more formal appearance. Note: Kit is for one side  
of firebox only. Two kits are required to do both  
sides of fireplace.  
BLOWER - GA3500A  
An optional blower is available for use with the  
FBST fireboxes for bidirectional heat circula-  
tion and may be installed during or after firebox  
installation.  
BRASS TRIM - GA6093  
Easily clips around firebox to provide a finished  
appearance covering rough and or unfinished  
mantel edges. Note: Kit is for one side of firebox  
only. Two kits are required to do both sides of  
fireplace.  
18  
105116-01D  
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NOTES  
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105116-01D  
1ꢂ  
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WaRRaNTy iNFORMaTiON  
kEEP ThiS WaRRaNTy  
Model  
Serial No.  
Date Purchased  
Always specify model and serial numbers when communicating with the factory.  
We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our  
standard written warranty. We make no other warranty, expressed or implied.  
LiMiTED WaRRaNTy  
VENT-FREE FiREBOX  
DESA warrants this product to be free from defects in materials and components for four (4) years from the date  
of first purchase, provided that the product has been properly installed, operated and maintained in accordance  
with all applicable instructions. To make a claim under this warranty the Bill of Sale or cancelled check must  
be presented.  
This warranty is extended only to the original retail purchaser. This warranty covers the cost of part(s) required to  
restore this heater to proper operating condition and an allowance for labor when provided by a 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 qualified installer in accordance with all local codes and instructions  
furnished with the unit.  
This warranty does not apply to parts that are not in original condition because of normal wear and tear or parts  
that fail or become damaged as a result of misuse, accidents, lack of proper maintenance or defects caused by  
improper installation. Travel, diagnostic cost, labor, transportation and any and all such other costs related to  
repairing a defective heater will be the responsibility of the owner.  
TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE SALE  
OF THE PRODUCT; THIS EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EXPRESSED  
WARRANTIESAND LIMITS THE DURATION OFANYAND 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 DESAS 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 specific 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  
105116-01  
105116 01  
Rev. D  
NOT A UPC  
10/05  
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