Desa Glo-Warm FB-3B Quick start guide

FB-3B
FBS-3C
FB-5B
FBS-5C
Save this manual for future reference.
INFRARED VENT-FREE PROPANE/LP GAS HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
WARNING: If the information in this manual is
not followed exactly, a fire or explosion may
result causing property damage, personal
injury, or loss of life.
— Do not store or use gasoline or other
flammable vapors and liquids in the vicinity of
this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Donottouchanyelectricalswitch;donotuse
any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas
supplier’s instructions.
• Ifyou cannot reachyour gas supplier,call the
fire department.
— Installation and service must be performed by
a qualified installer, service agency, or the
gas supplier.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
WARNING: This is an
unvented gas-fired heater.
Itusesair(oxygen)fromthe
roominwhichitisinstalled.
Provisions for adequate
combustion and ventilation
air must be provided. Refer
to Air For Combustion and
Ventilation section on page
4 of this manual.
WARNING: Improper instal-
lation,adjustment,alteration,
service, or maintenance can
causeinjuryorpropertydam-
age. Refer to this manual for
correct installation and op-
erationalprocedures.Foras-
sistance or additional infor-
mationconsultaqualifiedin-
staller,serviceagency,orthe
gas supplier.
Thisappliancemaybeinstalledinanaftermarket*,permanentlylocated,manufac-
tured (mobile) home, where not prohibited by local codes.
Thisapplianceisonlyforusewiththetypeofgasindicatedontheratingplate.This
appliance is not convertible for use with other gases.

2
105567
INFRARED PROPANE/LP GAS HEATER
1. This appliance is only for use with the
typeof gas indicated on therating plate.
Thisappliance is notconvertible for use
with other gases.
2. Do not placepropane/LP supply tank(s)
inside any structure. Locate propane/
LP supply tank(s) outdoors.
3. If you smell gas
• Shut off gas supply.
• Do not try to light any appliance.
• Donot touch anyelectricalswitch; do
not use any phone in your building.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
• Ifyou cannot reachyour gas supplier,
call the fire department
SAFETY
INFORMATION
Carbon Monoxide Poisoning: Early signs
ofcarbonmonoxidepoisoningresemblethe
flu, with headaches, dizziness, or nausea. If
you have these signs, the heater may not be
working properly. Get fresh air at once!
Haveheaterserviced.Somepeoplearemore
affected by carbon monoxide than others.
These include pregnant women, persons
with heart or lung disease or anemia, those
under the influence of alcohol, and those at
high altitudes.
Propane/LP Gas: Propane/LP gas is odor-
less. An odor-making agent is added to
propane/LP gas. The odor helps you detect
apropane/LPleak.However,theodoradded
topropane/LPgascanfade.Propane/LPgas
may be present even though no odor exists.
Make certain you read and understand all
warnings.Keepthismanualforreference.It
isyourguidetosafeandproperoperationof
this heater.
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, oper-
ate, or service this heater. Im-
properuseofthisheatercancause
seriousinjuryordeathfromburns,
fire, explosion, electrical shock,
and carbon monoxide poisoning.
4. This heater shall not be installed in a
bedroom or bathroom.
5. Always run non-thermostat heater with
plaque control knob in a locked posi-
tion. Never set control knob between
locked positions. Poor combustion and
higher levels of carbon monoxide may
result.
6. This heater needs fresh, outside air ven-
tilation to run properly. This heater has
an Oxygen Depletion Sensing (ODS)
safety shutoff system. The ODS shuts
down the heater if not enough fresh air
is available. See Fresh Air for Combus-
tion and Ventilation, pages 4 through 6.
7. Keep all air openings in front and bot-
tom of heater clear and free of debris.
This will insure enough air for proper
combustion.
8. If heater shuts off, do not relight until
you provide fresh, outside air. If heater
keeps shutting off, have it serviced.
9. Do not run heater
• where flammable liquids or vapors
are used or stored
• under dusty conditions
10. Before usingfurniture polish,wax, car-
pet cleaner, or similar products, turn
heater off. If heated, the vapors from
theseproducts may create a white pow-
der residue within burner box or on
adjacent walls or furniture.
11. Do not use heater if any part has been
under water. Immediately call a quali-
fied service technician to inspect the
room heater and to replace any part of
the control system and any gas control
which has been under water.
12. Turn off and unplug heater and let cool
beforeservicing. Only aqualifiedservice
person should service and repair heater.
13. Operating heater above elevations of
4,500 feet could cause pilot outage.
14. To prevent performance problems, do
not use propane/LP fuel tank of less
than 100 lbs. capacity.
WARNINGS
DANGER: Carbon monoxide
poisoning may lead to death!
WARNING:Anychangetothis
heater or its controls can be
dangerous.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the heater.
Surface of heater becomes very
hot when running heater. Keep
children and adults away from
hot surface to avoid burns or
clothing ignition. Heater will re-
main hot for a time after shut-
down. Allow surface to cool be-
fore touching.
Carefully supervise young chil-
dren when they are in the same
room with heater.
Make sure grill guard is in place
before running heater.
Keeptheapplianceareaclearand
free from combustible materials,
gasoline, and other flammable
vapors and liquids.
Due to high temperatures, the
appliance should be located out
oftrafficandawayfromfurniture
and draperies.

3
105567
OWNER’S MANUAL
PRODUCT
IDENTIFICATION
LOCAL CODES
Install and use heater with care. Follow all
localcodes.Intheabsenceoflocalcodes,use
the latest edition of National Fuel Gas Code
ANS Z223.1, also known as 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
Figure 1 - Vent-Free Propane/LP Gas Heater (Model FB-5B Shown)
Control Knob
PRODUCT
FEATURES
SAFETY DEVICE
This heater has a pilot with an Oxygen
Depletion Sensing (ODS) safety shutoff
system. The ODS/pilot is a required feature
for vent-free room heaters. The ODS/pilot
shuts off the heater if there is not enough
fresh air.
PIEZO IGNITION SYSTEM
This heater has a piezo ignitor. This system
requires no matches, batteries, or other
sources to light heater.
THERMOSTATIC HEAT
CONTROL ON THERMOSTAT
MODELS FBS-3C AND FBS-5C
These heaters have a control valve with a
thermostat sensing bulb. This results in the
greatest heater comfort and may result in
lower gas bills.
UNPACKING
1. Remove heater from carton.
2. Remove all protective packaging ap-
plied to heater for shipment.
3. Check heater for any shipping damage.
If heater is damaged, promptly inform
dealer where you bought heater.
Grill
Guard
Burners
Heater
Cabinet
Front
Panel

4
105567
INFRARED PROPANE/LP GAS HEATER
FRESH AIR FOR
COMBUSTION AND
VENTILATION
Today’s homes are built more energy effi-
cient than ever. New materials, increased
insulation, and new construction methods
helpreduceheatlossinhomes.Homeowners
weatherstripandcaulkaroundwindowsand
doorstokeepthecoldairoutandthewarmair
in. During heating months, home owners
want their homes as airtight as possible.
While it is good to make your home energy
efficient,yourhomeneedstobreathe.Fresh
air must enter your home. All fuel-burning
appliances need fresh air for proper com-
bustion and ventilation.
Exhaustfans,fireplaces,clothesdryers,and
fuel burning appliances draw air from the
house to operate. You must provide ad-
equate fresh air for these appliances. This
will insure proper venting of vented fuel-
burning appliances.
PRODUCING ADEQUATE
VENTILATION
The following are excerpts from National
Fuel Gas Code, NFPA 54/ANS Z223.1, Sec-
tion5.3,AirforCombustionandVentilation.
Allspacesinhomesfallintooneofthethree
following ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 4 through 6 will
help you classify your space and provide
adequate ventilation.
Unusually Tight Construction
The air that leaks around doors and win-
dows 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 de-
fined as construction where:
a. walls and ceilings exposed to the
outside atmosphere have a con-
tinuous water vapor retarder with
a rating of one perm (6 x 10-11 kg
per pa-sec-m2) or less with open-
ings 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, be-
tween sole plates and floors,be-
tween wall-ceiling joints, be-
tween wall panels, at penetra-
tionsforplumbing,electrical,and
gas lines, and at other openings.
If your home meets all of the three
criteria above, you must provide ad-
ditional fresh air. See Ventilation Air
From Outdoors , page 6 .
If your home does not meet all of the
threecriteriaabove,see Determining
Fresh-Air Flow for Heater Location,
page 5.
Confined and Unconfined Space
The National Fuel Gas Code ANS 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 m3per kw) of the aggre-
gate input rating of all appliances installed
in that space and an unconfined space as a
space whose volume is not less than 50
cubicfeetper1,000Btuperhour(4.8m3per
kw) of the aggregate input rating of all
appliances installed in that space. Rooms
communicating directly with the space in
whichtheappliancesareinstalled*,through
openings not furnished with doors, are con-
sidered a part of the unconfined space.
This heater shall not be installed in a con-
fined space or unusually tight construction
unlessprovisions are providedfor adequate
combustion and ventilation air.
*Adjoiningroomsarecommunicatingonly
iftherearedoorlesspassagewaysorventila-
tion grills between them.
WARNING: This heater shall
notbeinstalledinaconfinedspace
or unusually tight construction
unless provisions are provided
foradequatecombustionandven-
tilation air. Read the following in-
structions to insure proper fresh
air for this and other fuel-burning
appliances in your home.

5
105567
OWNER’S MANUAL
FRESH AIR FOR
COMBUSTION AND
VENTILATION
Continued
DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION
Determining if You Have a Confined or Unconfined Space
Use this worksheet to determine if you have a confined or unconfined space.
Space:Includestheroominwhichyouwillinstallheaterplusanyadjoiningroomswithdoorlesspassagewaysorventilationgrillsbetween
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. Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space can support.
_________________ (volume of space) ÷50 cu. ft. = (Maximum Btu/Hr the space can support)
Example: 2560 cu. ft. (volume of space) ÷50 cu. ft. = 51.2 or 51,200 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in the space.
Vent-free heater ___________________ Btu/Hr
Gas water heater* ___________________ Btu/Hr
Gas furnace ___________________ Btu/Hr
Vented gas heater ___________________ Btu/Hr
Gas fireplace logs ___________________ Btu/Hr
Other gas appliances* +__________________ Btu/Hr
Total =__________________ Btu/Hr
* Do not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and vents to the outdoors.
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)
58,000 Btu/Hr (actual amount of Btu/Hr used)
ThespaceintheaboveexampleisaconfinedspacebecausetheactualBtu/HrusedismorethanthemaximumBtu/Hrthespacecansupport.
You must provide additional fresh air. Your options are as follows:
A. Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoin-
ing room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 6.
B. Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 6.
C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconfined.
If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an unconfined space. You will need no
additional fresh air ventilation.
Continued
Example:
Gas water heater 40,000 Btu/Hr
Vent-free heater +18,000 Btu/Hr
Total =58,000 Btu/Hr
WARNING:Iftheareainwhichtheheatermaybeoperatedissmallerthanthatdefinedasanunconfinedspace
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, Section 5.3 or applicable local codes.

6
105567
INFRARED PROPANE/LP GAS HEATER
Figure 3 - Ventilation Air from Outdoors
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or ducts. You must provide two per-
manent openings: one within 12" of the
ceiling and one within 12" of the floor.
Connecttheseitemsdirectlytotheoutdoors
orspacesopentotheoutdoors.Thesespaces
include attics and crawl spaces. Follow the
National Fuel Gas Code NFPA 54/ANS
Z223.1,Section5.3,AirforCombustionand
Ventilation for required size of ventilation
grills or ducts.
IMPORTANT: Donot provide openingsfor
inlet or outlet air into attic if attic has a
thermostat-controlledpowervent.Heatedair
enteringtheatticwillactivatethepowervent.
Outlet
Air Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
FRESH AIR FOR
COMBUSTION AND
VENTILATION
Continued
Or
Remove
Door into
Adjoining
Room,
Option 3
Ventilation Grills
Into Adjoining Room,
Option 2
12"
12"
Ventilation
Grills
into Adjoining
Room,
Option 1
VENTILATION AIR
Ventilation Air From Inside
Building
Thisfreshairwouldcomefromanadjoining
unconfined space. When ventilating to an
adjoining unconfined space, you must pro-
vide two permanent openings: one within
12" of the ceiling and one within 12" of the
floor on the wall connecting the two spaces
(seeoptions1and2,Figure2).Youcanalso
remove door into adjoining room (see op-
tion 3, Figure 2). Follow the National Fuel
Gas Code NFPA 54/ANS Z223.1, Section
5.3, Air for Combustion and Ventilation for
required size of ventilation grills or ducts.
Figure 2 - Ventilation Air from Inside Building
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.

7
105567
OWNER’S MANUAL
INSTALLATION
WARNING: A qualified ser-
vice person must install heater.
Follow all local codes.
CHECK GAS TYPE
Useonlypropane/LPgas.Ifyourgassupply
isnotpropane/LP,donotinstallheater.Call
dealer where you bought heater for proper
type heater.
INSTALLATION ITEMS
Beforeinstallingheater,makesureyouhave
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
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
* A CSA/AGA design-certified equipment
shutoff valve with 1/8" NPT tap is an ac-
ceptable alternative to test gauge connec-
tion. Purchase the optional CSA/AGA de-
sign-certifiedequipmentshutoffvalvefrom
your dealer. See Accessories, page 19.
LOCATING HEATER
This heater is designed to be mounted on
a wall.
WARNING:Maintainthemini-
mumclearancesshowninFigure
4.Ifyoucan,providegreaterclear-
ances from floor, ceiling, and
joining wall.
Youcan locate heateron floor, awayfrom a
wall. An optional floor mounting stand is
needed. Purchase the floor mounting stand
fromyourdealer.SeeAccessories, page19.
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing, or other flammable
objectsarelessthan36inches
from the front, top, or sides of
the heater
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas
IMPORTANT: Vent-free heaters add mois-
ture to the air. Although this is beneficial,
installing heater in rooms without enough
ventilationairmaycausemildewtoformfrom
too much moisture. See Fresh-Air for Com-
bustion and Ventilation, pages 4 through 6.
Continued
CAUTION: If you install the
heater in a home garage
• heater pilot and burner must
be at least 18 inches above
floor
• locateheaterwheremovingve-
hicle will not hit it
CAUTION: This heater cre-
ates warm air currents. These
currents move heat to wall sur-
faces next to heater. Installing
heater next to vinyl or cloth wall
coverings or operating heater
where impurities (such as to-
bacco smoke, aromatic candles,
cleaning fluids, oil or kerosene
lamps, etc.) in the air exist, may
discolor walls.
NOTICE: This heater is intended
foruseassupplementalheat.Use
this heater along with your pri-
mary heating system. Do not in-
stall this heater as your primary
heatsource. If youhave a central
heating system, you may run
system’scirculatingblowerwhile
usingheater.Thiswillhelpcircu-
late the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
Forconvenienceandefficiency,installheater
• where there is easy access for operation,
inspection, and service
• in coldest part of room
Anoptional fankitisavailablefromyour
dealer.SeeAccessories,page 19. Ifplan-
ning to use fan, locate heater near an
electrical outlet.
36"
2"
FLOOR
CEILING
Minimum
Minimum to
Top Surface
of Carpeting,
Tile or Other
Combustible
Material
8"
Minimum
From
Sides Of
Heater
Left
Side Right
Side
Figure4-MountingClearancesAsViewed
From Front of Heater
INSTALLING THERMOSTAT
SENSING BULB -
For T-Stat Models Only
Remove clip and bulb from shipping loca-
tion.Placeclipandbulbintooperationloca-
tion (see Figure 5)
Figure 5 - Moving Thermostat Sensing
Bulb

8
105567
INFRARED PROPANE/LP GAS HEATER
17
3
/ 8 "
17
1
/ 2 "
Min.
6
1
/ 2 "
Min.
Adjoining Wall
Only Insert Mounting
Screws Through Last
Hole On Each End
Floor
Methods For Attaching
Mounting Bracket To Wall
Only use last hole on each end of mounting
bracket to attach bracket to wall. These two
holes are 16 inches apart from their centers.
Attach mounting bracket to wall in one of
two ways
1. Attaching to wall stud
2. Attaching to wall anchor
Attaching to Wall Stud:This method pro-
vides the strongest hold. Insert mounting
screws through mounting bracket and into
wall studs.
Attaching to Wall Anchor: This method
allows you to attach mounting bracket to
hollow walls (wall areas between studs) or
to solid walls (concrete or masonry).
Decidewhichmethodbettersuitsyourneeds.
Eithermethodwillprovideasecureholdfor
the mounting bracket.
Marking Screw Locations
1. Tape mounting bracket to wall where
heater will be located. Make sure
mounting bracket is level.
Models FB-5B, FBS-5B
Models FB-3B, FBS-3B
Figure 9 - Mounting Bracket Clearances
WARNING:Maintainminimum
clearances shown in Figure 8. If
you can, provide greater clear-
ancesfromfloorandjoiningwall.
INSTALLING HEATER TO
WALL
Mounting Bracket
The mounting bracket is located on back
panel of heater. It has been taped there for
shipping. Remove mounting bracket from
back panel.
Removing Front Panel Of Heater
Models FBS-3C and FBS-5C
1. Remove two screws near bottom cor-
ners of front panel.
2. Liftstraightupongrillguarduntilitstops.
Grill guard will slide up about 1/4".
3. Pull bottom offront panel forward,then
down (see Figure 7).
Figure 6 - Mounting Bracket Location
Mounting
Bracket
INSTALLATION
Continued
Figure7-RemovingFrontPanelofHeater
(Model FBS-3B Shown)
Removing Front Panel Of Heater
Models FB-3B and FB-5B
1. Remove two screws near bottom cor-
ners of lower front panel.
2. Pull bottom of lower front panel for-
ward, then down (see Figure 8).
Figure8-RemovingFrontPanelofHeater
(Model FB-5B Shown)
2. Mark screw locations on wall (see Fig-
ure 9).
Note: Only mark last hole on each end
of mounting bracket. Insert mounting
screws through these holes only.
3. Remove tape and mounting bracket
from wall.
17
1
/ 2 "
Min.
10
1
/ 4 "
Min. 17
3
/ 8 "
Adjoining Wall
Only Insert Mounting
Screws Through Last
Hole On Each End
Floor

9
105567
OWNER’S MANUAL
Installing Bottom Mounting
Screws
1. Locate two bottom mounting holes.
These holes are near bottom on back
panel of heater (see Figure 13).
2. Mark screw locations on wall.
3. Remove heater from mounting bracket.
4. If installing bottom mounting screws
into hollow or solid wall, install wall
anchors. Follow steps 1 through 4 un-
der Attaching To Wall Anchor Method.
If installing bottom mounting screw
into wall stud, drill holes at marked lo-
cations using 9/64" drill bit.
5. Replace heater onto mounting bracket.
6. Place spacers between bottom mount-
ingholesandwallanchor or drilled hole.
7. Hold spacer in place with one hand.
With other hand, insert mountingscrew
through bottom mounting hole and
spacer. Place tip of screw in opening
of wall anchor or drilled hole.
8. Tightenbothscrewsuntilheaterisfirmly
secured to wall. Do not over tighten.
Note: Do not replace front panel at this
time. Replace front panel after making
gas connections and checking for leaks
(see pages 10 and 11).
Figure 11 - Popping Open Anchor Wings
For Thin Walls
Attaching Mounting Bracket To
Wall
Note: Wall anchors, mounting screws, and
spacers are in hardware package. The hard-
ware package is provided with heater.
Attaching to Wall Stud Method
Forattachingmountingbrackettowallstuds
1. Drill holes at marked locations using
9/64" drill bit.
2. Place mounting bracket onto wall. Line
uplast hole on each end of bracket with
holes drilled in wall.
3. Insert mounting screwsthrough bracket
and into wall studs.
4. Tighten screws until mounting bracket
is firmly fastened to wall studs.
Attaching to Wall Anchor Method
For attaching mounting bracket to hollow
walls (wall areas between studs) or solid
walls (concrete or masonry)
1. Drill holes at marked locations using
5/16"drill bit. For solid walls (concrete
or masonry), drill at least 1" deep.
2. Fold wall anchoras shown inFigure 10.
3. Insert wall anchor (wings first) into
hole. Tap anchor flush to wall.
4. For thin walls (1/2" or less), insert red
key into wall anchor. Push red key to
“pop” open anchor wings (see Figure
11). IMPORTANT: Do not hammer
key!For thick walls (over 1/2" thick)
or solid walls, do not pop open wings.
5. Place mounting bracket onto wall. Line
uplast hole on each end of bracket with
wall anchors.
6. Insert mounting screwsthrough bracket
and into wall anchors.
7. Tighten screws until mounting bracket
is firmly fastened to wall.
Placing Heater On Mounting
Bracket
1. Locate two horizontal slots on back
panel of heater (see Figure 12).
2. Place heater onto mounting bracket.
Slide horizontal slots onto stand-out
tabs on mounting bracket.
Figure 10 - Folding Anchor
INSTALLATION
Continued
Figure 12 - Mounting Heater Onto
Mounting Bracket
Stand-Out Tab Mounting Bracket
(attached to wall)
Horizontal Slots
Figure 13 - Installing Bottom Mounting
Screws
Continued

10
105567
INFRARED PROPANE/LP GAS HEATER
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Test
Gauge
Connection *
Sediment
Trap
Tee Joint
Pipe Nipple
Cap
Equipment
Shutoff
Valve *
3/8" NPT
Pipe Nipple
Heater
Cabinet
Figure 15 - Gas Connection
* ACSA/AGAdesign-certifiedequipmentshutoffvalvewith1/8"NPTtapisanacceptable
alternative to test gauge connection. Purchase the optional CSA/AGA design-certified
equipment shutoff valve from your dealer. See Accessories, page 19.
3" Minimum
Ground Joint
Union
Pressure
Regulator
Regulator
Bracket
Inlet Pipe From
External Regulator
(11" W.C. to 14"
W.C. Pressure)
CONNECTING TO GAS
SUPPLY
WARNING:Aqualifiedservice
person must connect heater to
gassupply.Followalllocalcodes.
Typical Inlet Pipe Diameters
FB-3B/FBS-3C 3/8" or greater
FB-5B/FBS-5C 1/2" or greater
Installationmustincludeequipmentshutoff
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 15).
IMPORTANT: Installanequipmentshutoff
valve in an accessible location. The equip-
ment shutoff valve is for turning on or
shutting off the gas to the appliance.
Installsedimenttrapinsupplylineasshown
in Figure 15. Locate sediment trap where it
is within reach for cleaning. Locate sedi-
menttrap wheretrapped matteris notlikely
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.
IMPORTANT: Hold pressure regulator
with wrench when connecting it to gas pip-
ing and/or fittings.
CAUTION:Usepipejointseal-
ant that is resistant to liquid pe-
troleum (LP) gas.
The installer must supply an external regu-
lator. The external regulator will reduce
incoming gas pressure. You must reduce
incominggaspressuretobetween11and14
inchesofwater.Ifyoudonotreduceincom-
ing gas pressure, heater regulator damage
could occur. Install external regulator with
the vent pointing down as shown in Figure
14. Pointing the vent down protects it from
freezing rain or sleet.
CAUTION: Never connect
heater directly to the propane/
LP supply. This heater requires
an external regulator (not sup-
plied). Install the external regu-
lator between the heater and
propane/LP supply.
CAUTION:Useonlynew,black
ironorsteelpipe.Internally-tinned
copper tubing may be used in
certain areas. Check your local
codes. Use pipe of large enough
diameter to allow proper gas vol-
umetoheater. If pipe is too small,
unduelossofpressurewilloccur.
INSTALLATION
Continued
Figure 14 - External Regulator with Vent
Pointing Down
Propane/LP
Supply
Tank
Vent Pointing Down
External Regulator
Apply pipe joint sealant lightly to male
threads. This will prevent excess sealant
fromgoing into pipe.Excess sealant inpipe
could result in clogged heater valves.
WARNING:Thisappliancere-
quires a 3/8" NPT (National Pipe
Thread) inlet connection to the
pressure regulator.

11
105567
OWNER’S MANUAL
CHECKING GAS
CONNECTIONS
Pressure Testing Gas Supply
Piping System
Test Pressures In Excess Of 1/2 PSIG
(3.5 K Pa)
1. Disconnect appliance with its appliance
maingasvalve(controlvalve)andequip-
ment shutoff valve from gas supply pip-
ingsystem.Pressuresinexcessof1/2psig
will damage heater regulator.
2. Cap off open end of gas pipe where
equipmentshutoffvalve wasconnected.
3. Pressurize supply piping system by ei-
ther using compressed air or opening
propane/LP supply tank valve.
4. Check all joints of gas supply piping
system. Apply mixture of liquid soap
and water to gas joints. Bubbles form-
ing show a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment
shutoff valve to gas supply. Check re-
connected fittings for leaks.
TestPressures Equal Toor Less Than1/2
PSIG (3.5 K Pa)
1. Close equipment shutoffvalve (seeFig-
ure 16).
2. Pressurize supply piping system by ei-
ther using compressed air or opening
propane/LP supply tank valve.
3. Check all joints from propane/LP sup-
plytank to equipmentshutoffvalve (see
Figure 17). Apply mixture of liquid
soap and water to gas joints. Bubbles
forming show a leak.
4. Correct all leaks at once.
WARNING:Neveruseanopen
flame to check for a leak. Apply a
mixture of liquid soap and water
toalljoints.Bubblesformingshow
a leak. Correct all leaks at once.
WARNING: Test all gas pip-
ing and connections for leaks
after installing or servicing. Cor-
rect all leaks at once.
Pressure Testing Heater Gas
Connections
1. Open equipment shutoff valve (see
Figure 16).
2. Open propane/LP supply tank valve.
3. Make sure control knob of heater is in
the OFF position.
4. Check all jointsfrom equipment shutoff
valve to control valve (see Figure 16).
Apply mixture of liquid soap and wa-
ter to gas joints. Bubbles forming show
a leak.
5. Correct all leaks at once.
6. Light heater (see Operating Heater,
column 3 and page 12 for non-thermo-
stat models, pages 13 and 14 for ther-
mostat models). Check the rest of the
internal joints for leaks.
7. Turn off heater (see To Turn Off Gas
to Appliance, page 12 for non-ther-
mostat models or page 13 for thermo-
stat models).
8. Replace front panel.
O
PO
S
P
Figure 16 - Equipment Shutoff Valve
Equipment
Shutoff
Valve
Closed
Figure 17 - Checking Gas Joints
Propane/LP
Supply Tank
Open
OPERATING
HEATER
NON-THERMOSTAT MODELS
FB-3B AND FB-5B
INSTALLATION
Continued
Continued
FOR YOUR SAFETY
READ BEFORE
LIGHTING
A. Thisappliance hasapilotwhich must
belightedby hand.Whenlightingthe
pilot,followtheseinstructionsexactly.
B. BEFORE LIGHTING smell all
aroundthe applianceareaforgas. Be
sureto smellnext tothe floorbecause
some gas is heavier than air and will
settle on the floor.
WHATTODOIFYOUSMELLGAS
• Do not try to light any appliance.
• Donottouchanyelectricswitch; do
notuse anyphone inyourbuilding.
• Immediatelycall your gassupplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
• If you cannot reach your gas sup-
plier, call the fire department.
C. Useonly your handto pushinor turn
thegas controlknob.Never usetools.
If the knob will not push in or turn
by hand, don’t try to repair it, call a
qualified service technician or gas
supplier. Force or attempted repair
may result in a fire or explosion.
D. Do not use this appliance if any part
hasbeenunderwater.Immediatelycall
aqualifiedservicetechniciantoinspect
the appliance and to replace any part
of the control system and any gas con-
trol which has been under water.
WARNING: If you do not fol-
low these instructions exactly, a
fireorexplosionmayresultcaus-
ing property damage, personal
injury or loss of life.
Equipment
Shutoff
Valve
Control Valve
Location Non-
Thermostat Models
Control Valve Location
Thermostat Models

12
105567
INFRARED PROPANE/LP GAS HEATER
TO SELECT
HEATING LEVEL
Slightlypressincontrolknobandturncoun-
terclockwise to the LOW, ME-
DIUM, or HIGH positions (see Figure 20).
IMPORTANT: Release downward pres-
surewhile turningcontrol knob.Control
knob will lock at the desired position.
WARNING: When running
heater, set control knob at LOW,
MEDIUM, or HIGH locked posi-
tions. Never set control knob be-
tween locked positions. Poor
combustion and higher levels of
carbon monoxide may result.
CAUTION:Donottrytoadjust
heatinglevelsbyusingtheequip-
ment shutoff valve.
1. STOP! Read the safety information
page 11, column 3.
2. Make sure equipment shutoff valve
is fully open.
3. Turncontrolknobclockwise
to the OFF position.
4. Wait five minutes to clear out any
gas. Then smell for gas, including
near the floor. If you smell gas,
STOP! Follow “B” in the safety in-
formation page 11, column 3. If you
don’t smell gas, go to the next step.
5. Pressinand turncontrolknob coun-
terclockwise toPILOT/IGN
position. Press in control knob for
five (5) seconds (see Figure 18).
Note: Youmaybe runningthis heater
for the first time after hooking up to
gassupply.Ifso,youmayneedtopress
incontrolknobfor30seconds.Thiswill
allowair tobleed fromthe gassystem.
• Ifcontrolknobdoesnotpopupwhen
released, contact a qualified service
person or supplier for repairs.
6. Release downward pressure on con-
trolknob andturnclockwise
to OFF position.
7. Press in control knob and turn back
to PILOT/IGN. This will cause the
piezo ignitor to spark and light the
pilot gas. If needed, repeat steps 5
through 7 until pilot lights.
Note: If pilot does not stay lit, refer
toTroubleshooting,pages15 through
17. Also contact a qualified service
person or gas supplier for repairs.
Until repairs are made, light pilot
withmatch.Tolight pilotwithmatch,
see Manual Lighting Procedure.
8 . 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.
OPERATING
HEATER
Continued
Ignitor Electrode
Pilot Burner
Thermocouple
Figure 19 - Pilot
LIGHTING
INSTRUCTIONS
Figure 18 - Control Knob In The OFF
Position
TO TURN OFF GAS TO
APPLIANCE
MANUAL LIGHTING
PROCEDURE
1. Followsteps 1through5under Light-
ing Instructions.
2. With control knob pressed in, strike
match. Hold match to pilot until pi-
lot lights.
3. Keep control knob pressed in for 30
seconds after lighting pilot.After 30
seconds, release control knob.
Shutting Off Heater
1. Turncontrolknob clockwise
to the OFF position.
2. Turn off all electric power to the ap-
pliance if service is to be performed.
Shutting Off Burner Only (pilot
stays lit)
Turn control knob clockwise to
the PILOT/IGN position.
Figure 20 - Burner Patterns
Control
Knob FB-3B FB-5B
LOW
HIGH
OFF
MED

13
105567
OWNER’S MANUAL
OPERATING
HEATER
Continued
THERMOSTAT MODELS FBS-3C
AND FBS-5C
FOR YOUR SAFETY
READ BEFORE
LIGHTING
A. Thisappliance hasapilotwhich must
belightedby hand.Whenlightingthe
pilot,follow theseinstructionsexactly.
B. BEFORE LIGHTING smell all
aroundthe applianceareaforgas. Be
sureto smellnext tothe floorbecause
some gas is heavier than air and will
settle on the floor.
WHATTODOIFYOUSMELLGAS
• Do not try to light any appliance.
• Donottouchanyelectricswitch; do
notuse anyphone inyourbuilding.
• Immediatelycall your gassupplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
• If you cannot reach your gas sup-
plier, call the fire department.
C. Useonly your handto pushinor turn
thegas controlknob.Never usetools.
If the knob will not push in or turn
by hand, don’t try to repair it, call a
qualified service technician or gas
supplier. Force or attempted repair
may result in a fire or explosion.
D. Do not use this appliance if any part
hasbeenunderwater.Immediatelycall
aqualifiedservicetechniciantoinspect
the appliance and to replace any part
of the control system and any gas con-
trol which has been under water.
WARNING: If you do not fol-
low these instructions exactly, a
fireorexplosionmayresultcaus-
ing property damage, personal
injury or loss of life.
LIGHTING
INSTRUCTIONS
1. STOP!Readthe safetyinformation,
column 1.
2. Make sure equipment shutoff valve
is fully open.
OFF
ON
PILOT
IGN
1
7
3
5
4
6
2
Figure 21- Dual Control for Thermostat
Models FBS-3C and FBS-5C
Continued
Figure 22 - Pilot
Ignitor Electrode
Pilot Burner
Thermocouple
OFF
ON
PILOT
IGN
1
7
3
5
4
6
2
OFF
ON
PILOT
IGN
1
7
3
5
4
6
2
Figure 23 - Burner Patterns
Temperature Control
Setting Knob Knob FBS-3C FBS-5C
ON
OFF
3. Pushincontrolknobslightlyandturn
clockwise to the OFF posi-
tion.Besurethatthe temperatureset-
ting knob is set at the line between
level 1 and level 7 (see Figure 21).
4. Wait five minutes to clear out any
gas. Then smell for gas, including
near the floor. If you smell gas,
STOP! Follow “B” in the safety in-
formation in column 1. If you don’t
smell gas, go to the next step.
5. Pushin and turncontrolknob coun-
terclockwise to PILOT po-
sition. Press in control knob for five
(5) seconds.
Note: You may be running this
heater for the first time after hook-
ing up to gas supply. If so, you may
need to press in control knob for 30
seconds.This will allow air to bleed
from the gas system.
6. Release downward pressure on con-
trol knob and turn clockwise
to OFF position.
7. Press in control knob and turn coun-
terclockwise past IGN to PI-
LOT(seeFigure21).Thiswillcausethe
piezoignitortosparkandlightthepilot
gas. Keep control knob depressed for
10 seconds before releasing. If needed,
repeatsteps5through7untilpilotlights.
Note: If pilot does not stay lit, refer
to Troubleshooting, pages 15 through
17. Also contact a qualified service
person or gas supplier for repairs.
Untilrepairsaremade, lightpilotwith
match. To light pilot with match, see
Manual Lighting Procedure, page 14.
8 . When pilot is lit, turn the control
knob to ON position (see Figure 23).
9. To select desired heating level, turn
the temperature setting knob coun-
terclockwise between 1 and
7 (see Figure 23).
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. Turncontrolknob clockwise
to the OFF position.
2. Turn off all electric power to the ap-
pliance if service is to be performed.
Shutting Off Burner Only (pilot
stays lit)
Turn control knob clockwise to
the PILOT position.

14
105567
INFRARED PROPANE/LP GAS HEATER
THERMOSTAT CONTROL
OPERATION
The thermostatic control used on these
modelsdiffersfromstandardthermostats.
Standardthermostats simply turnon and
off the burner. The thermostat used on
this heater senses the room temperature.
At times the room may exceed the set
temperature.Ifso,theburnerwillshutoff.
The burner will cycle back on when room
temperaturedropsbelowthesettempera-
ture.Thetemperaturesettingknobcanbe
set to any comfort level between 1 and 7.
Note: The thermostat sensing bulb mea-
sures the temperature of air near the
heatercabinet.Thismaynotalwaysagree
with room temperature (depending on
housing construction, installation loca-
tion, room size, open air temperatures,
etc.) Frequent use of your heater will let
you determine your own comfort levels.
MANUAL LIGHTING
PROCEDURE
1. Followsteps 1through5under Light-
ing Instructions, page 13.
2. With control knob pressed in, strike
match. Hold match to pilot until pi-
lot lights.
3. Keep control knob pressed in for 30
seconds after lighting pilot.After 30
seconds,releasecontrolknob.Follow
steps8 and 9under LightingInstruc-
tions, page 13.
INSPECTING
BURNER
Check pilot flame pattern and burner flame
pattern often.
PILOT FLAME PATTERN
Figure24showsacorrectpilotflamepattern.
Figure 25 shows an incorrect pilot flame
pattern.Theincorrectpilotflameisnottouch-
ing the thermocouple. This will cause the
thermocouple to cool. When the thermo-
couple cools, the heater will shut down.
Ifpilotflame pattern isincorrect, asshown
in Figure 25
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 12 for non-thermostat mod-
els or page 13 for thermostat models)
• seeTroubleshooting, pages 15 through 17
CLEANING AND
MAINTENANCE
WARNING: Turn off heater
and let cool before servicing.
OPERATING
HEATER
Continued
BURNER FLAME PATTERN
Figure 26 shows a correct burner flame
pattern.Figure27showsanincorrectburner
flame pattern.
Ifpilotflame pattern isincorrect, asshown
in Figure 27
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 12 for non-thermostat mod-
els or page 13 for thermostat models)
• seeTroubleshooting, pages 15 through 17
Figure 25 - Incorrect Pilot Flame Pattern
GRH/OV 009GOOD PILOT
Figure 24- Correct Pilot Flame Pattern
Thermocouple
GRH/OV 010BAD PILOT
Thermocouple
Pilot Burner
Pilot Burner
Figure 26 - Correct Burner Flame Pattern
Bad Burner Pattern-Plaque GRH/OV 019
Figure27-IncorrectBurnerFlamePattern
CAUTION: You must keep
control areas, burner, and circu-
lating air passageways of heater
clean. Inspect these areas of
heater before each use. Have
heaterinspectedyearlybyaquali-
fied service person. Heater may
needmorefrequentcleaningdue
to excessive lint from carpeting,
bedding material, pet hair, etc.
ODS/PILOT AND BURNER
• Use a vacuum cleaner, pressurized air,
or small, soft bristled brush to clean.
CLEANING BURNER
PILOT AIR INLET HOLE
We recommend that you clean the unit every
2,500hoursofoperationoreverythreemonths.
Wealsorecommendthatyoukeeptheburner
tubeandpilotassemblycleanandfreeofdust
anddirt.To clean theseparts werecommend
usingcompressed airno greaterthan 30PSI.
Yourlocalcomputerstore,hardwarestore,or
home center may carry compressed air in a
can. You can use a vacuum cleaner in the
blow position. If using compressed air in a
can, please follow the directions on the can.
Ifyoudon'tfollowdirectionsonthecan, you
could damage the pilot assembly.
1. Shut off the unit, including the pilot.
Allow the unit to cool for at least thirty
minutes.
2. Inspect burner, pilot for dust and dirt.
3. Blow air through the ports/slots and
holes in the burner.
Clean the pilot assembly also. A yellow tip
on the pilot flame indicates dust and dirt in
the pilot assembly. There is a small pilot air
inlet hole about two inches from where the
pilot flame comes out of the pilot assembly
(see Figure 28). With the unit off, lightly
blowair through theair inlet hole.You may
blowthroughadrinkingstrawifcompressed
air is not available.
Figure 28 - Pilot Inlet Air Hole
Pilot Assembly
Pilot Air Inlet
Hole
CABINET
Air Passageways
• Use a vacuum cleaner or pressurized air
to clean.
Exterior
• Use a soft cloth dampened with a mild
soap and water mixture. Wipe the cabi-
net to remove dust.

15
105567
OWNER’S MANUAL
TROUBLESHOOTING
Note: All troubleshooting items are listed
in order of operation.
OBSERVED PROBLEM
Whenignitorbuttonispressedin,thereisno
spark at ODS/pilot
ODS/pilot lights but flame goes out when
control knob is released
When ignitor button is pressed in, there is a
spark at ODS/pilot but no ignition
POSSIBLE CAUSE
1. Ignitor electrode positioned wrong
2. Ignitor electrode broken
3. Ignitor electrode not connected to igni-
tor cable
4. Ignitor cable pinched or wet
5. Broken ignitor cable
6. Bad piezo ignitor
1. Gas supply turned off or equipment
shutoff valve closed
2. Control knob not fully pressed in while
pressing ignitor button
3. Air in gas lines when installed
4. Depleted gas supply
5. ODS/pilot is clogged
6. Gas regulator setting is not correct
7. Control knob not in pilot position
1. Control knob not fully pressed in
2. Control knob not pressed inlong enough
3. Equipment shutoff valve not fully open
4. Thermocouple connection loose at con-
trol valve
5. Pilot flame not touching thermocouple,
which allows thermocouple to cool,
causing pilot flame to go out. This prob-
lem could be caused by one or both of
the following:
A) Low gas pressure
B) Dirty or partially clogged ODS/pilot
6. Thermocouple damaged
7. Control valve damaged
REMEDY
1. Replace ignitor
2. Replace ignitor
3. Reconnect ignitor cable
4. Free ignitor cable if pinched by any
metal or tubing. Keep ignitor cable dry
5. Replace ignitor cable
6. Replace control valve (piezo is part of
control valve)
1. Turn on gas supply or open equipment
shutoff valve
2. Fully press in control knob while press-
ing ignitor button
3. Continue holdingdown control knob.Re-
peatigniting operation untilairisremoved
4. Contact local propane/LP gas company
5. Clean ODS/pilot (see Cleaning and
Maintenance, page 14 ) or replace ODS/
pilot assembly
6. Replace gas regulator
7. Turn control knob to pilot position
1. Press in control knob fully
2. After ODS/pilot lights, keep control
knob pressed in 30 seconds
3. Fully open equipment shutoff valve
4. Hand tighten until snug, then tighten
1/4 turn more
5. A)Contactlocalpropane/LPgascompany
B) Clean ODS/pilot (see Cleaning and
Maintenance, page 14) or replace ODS/
pilot assembly
6. Replace thermocouple
7. Replace control valve
WARNING: Turn off and un-
plug heater and let cool before
servicing. Only a qualified ser-
vice person should service and
repair heater.
CAUTION: Never use a wire,
needle, or similar object to clean
ODS/pilot.ThiscandamageODS/
pilot unit.
Note: For additional help, visit DESA
International’stechnicalservicewebsite
at www.desatech.com.
www.desatech.com Continued

16
105567
INFRARED PROPANE/LP GAS HEATER
OBSERVED PROBLEM
Burner(s)doesnot light afterODS/pilotis lit
Delayed ignition of burner(s)
Burner backfiring during combustion
Burner plaque(s) does not glow
Slightsmokeor odor duringinitial operation
Heater produces a clicking/ticking noise
just after burner is lit or shut off
Whitepowderresidueformingwithinburner
box or on adjacent walls or furniture
TROUBLESHOOTING
Continued
REMEDY
1. Clean burner orifice(s) (see Cleaning
and Maintenance, page 14) or replace
burner orifice(s)
2. Replace burner orifice(s)
3. Contact local propane/LP gas company
1. Contact local propane/LP gas company
2. Clean burner orifice(s) (see Cleaning
and Maintenance, page 14) or replace
burner orifice(s)
1. Clean burner orifice(s) (see Cleaning
and Maintenance, page 14) or replace
burner orifice(s)
2. Replace burner
3. Replace gas regulator
1. Replace burner
2. Contact local propane/LP gas company
3. Turn control knob until it locks at de-
sired setting
1. Problem will stop after a few hours of
operation
1. This is common with most heaters. If
noise is excessive, contact qualified ser-
vice person
1. Turn heater off when using furniture
polish, wax, carpet cleaners, or similar
products
POSSIBLE CAUSE
1. Burner orifice(s) is clogged
2. Burner orifice(s) diameter is too small
3. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orifice(s) is clogged
1. Burner orifice(s) is clogged or damaged
2. Burner damaged
3. Gas regulator defective
1. Plaque damaged
2. Inlet gas pressure is too low
3. Control knob set between locked
positions
1. Residues from manufacturing processes
1. Metal expanding while heating or con-
tracting while cooling
1. When heated, vapors from furniture pol-
ish, wax, carpet cleaners, etc. turn into
white powder residue
www.desatech.com

17
105567
OWNER’S MANUAL
TROUBLESHOOTING
Continued
WARNING: 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.
• Immediatelycallyourgassupplierfromaneighbor’sphone.Followthe
gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
POSSIBLE CAUSE
1. Heater burning vapors from paint, hair
spray, glues, etc. See IMPORTANT
statement above
2. Gas leak. SeeWarning statement at
top of page
1. Not enough fresh air is available
2. Low line pressure
3. ODS/pilot is partially clogged
1. Gas leak. SeeWarning statement at
top of page
2. Control valve defective
1. Foreign matter between control valve
and burner
2. Gas leak. SeeWarning statement at
top of page
1. Not enough combustion/ventilation air
OBSERVED PROBLEM
Heater produces unwanted odors
Heater shuts off in use (ODS operates)
Gas odor even when control knob is in OFF
position
Gas odor during combustion
Moisture/condensationnoticedonwindows
REMEDY
1. Ventilate room. Stop using odor caus-
ing products while heater is running
2. Locate and correct all leaks (see Check-
ing Gas Connections, page 11)
1. Open window and/ordoor for ventilation
2. Contact local propane/LP gas company
3. Clean ODS/pilot (see Cleaning and
Maintenance, page 14)
1. Locate and correct all leaks (see Check-
ing Gas Connections, page 11)
2. Replace control valve
1. Take apart gas tubing and remove for-
eign matter
2. Locate and correct all leaks (see Check-
ing Gas Connections, page 11)
1. Refer to Fresh Air for Combustion and
Ventilation requirements (page 4)
IMPORTANT: Operating heater where impurities in air exist may create odors. Cleaning
supplies, paint, paint remover, cigarette smoke, cements and glues, new carpet or textiles,
etc., create fumes. These fumes may mix with combustion air and create odors.
www.desatech.com

18
105567
INFRARED PROPANE/LP GAS HEATER
SPECIFICATIONS
FB-3B FBS-3C FB-5B FBS-5C
Btu (Variable) 6,000/12,000/15,000 15,000 6,000/15,000/25,000 25,000
Type Gas Propane/LP Only Propane/LP Only Propane/LP Only Propane/LP Only
Ignition Piezo Piezo Piezo Piezo
Pressure Regulator Setting 10 W.C. 10" W.C. 10" W.C. 10" W.C.
Inlet Gas Pressure* (in. of water)
Maximum 14" 14" 14" 14"
Minimum 11" 11" 11" 11"
Dimensions, Inches (H x W x D)
Heater 23 x 18.75 x 7 23 x 18.75 x 7 23 x 26 x 7 23 x 26 x 7
Carton 26 x 21 x 9 26 x 21 x 9 26 x 28.5 x 9 26 x 28.5 x 9
Weight (pounds)
Heater 19.8 20 28 28.5
Shipping 23.3 23.5 33.5 34
Note :Dimensions listed are outer most points on the heater (includes control knobs and grill).
* For purposes of input adjustment.
Baltimore Electric
1348 Dixwell Avenue
Hamden, CT 06514-0322
1-800-397-7553
203-248-7553
Parts Department
Portable Heater Parts
342 N. County Rd. 400 East
Valparaiso, IN 46383-9704
All States
219-462-7441
1-800-362-6951
[email protected]
[email protected]
FBD
1349 Adams Street
Bowling Green, KY 42103-3414
270-846-1199
1-800-654-8534
Fax: [phone]
[email protected]
Master Parts Dist.
1251 Mound Ave. NW
Grand Rapids, MI 49504-2672
616-791-0505
1-800-446-1446
Fax: [phone]
www.nbmc.com
Washer Equipment Co.
1715 Main Street
Kansas City, MO 64108-2195
KS, MO, AR
816-842-3911
www.washerparts.com
East Coast Energy Products
707 Broadway
W. Long Branch, NJ 07764-1542
732-870-8809
1-800-755-8809
www.njplaza.com/ecep
Tarantin Tank Co.
P.O. Box 6129
Freehold, NJ 07728-6129
908-780-9340
1-800-922-0724
www.tarantin.com
Heater and Fireplace Store
58 Halbe Lane
Cape May Court, NJ 08210-1110
609-390-9774
Parts Department
Dayton Hardware
P.O. Box 275
North Dayton Station
Dayton, OH 45404-0275
All States
937-258-3721
OH 1-800-762-3426
Halco Enterprises
208 Carter Drive, Unit 21
West Chester, PA 19382-4500
610-430-7717
1-800-368-0803
www.halcoenterprises.com
LA Porte’s Parts & Service
2444 N. 5th Street
Hartsville, SC 29550-7704
803-332-0191
Parts Department
Cans Unlimited, Inc.
P.O. Box 645
Taylor, SC 29687-0013
All States
803-879-3009
1-800-845-5301
[email protected]
PARTS CENTRALS
These Parts Centrals are privately owned businesses. They have agreed to support our
customer's needs by providing original replacement parts and accessories.

19
105567
OWNER’S MANUAL
FAN KITS - UH1000FB AND
UHS1000FB
For all models. Provides better heat distri-
bution. Makes heater more efficient. Com-
plete installation and operating instructions
included.
Manually-controlled-UH1000FB.Includes
ON/OFF switch.
Thermostatically-controlled-UHS1000FB.
Includes three settings: ON/OFF/AUTO.
ACCESSORIES
Purchasetheseheateraccessoriesfromyour
local dealer. If they can not supply these
accessories,contactyournearestParts Cen-
tral or call DESA International’s Parts De-
partment at 1-800-972-7879 for referral in-
formation.Youcanalsowritetotheaddress
listed on the back page of this manual.
EQUIPMENT SHUTOFF
VALVE GA5010
For all models. Equipment shutoff valve
with 1/8" NPT tap.
FLOOR MOUNTING STAND
Models FB-3B and FBS-3B -
UH3000BA
Model FB-5B and FBS-5B -
UH5000BA
For locating heater on the floor, away from
a wall. Complete installation instructions
provided with floor mounting stand.
TECHNICAL
SERVICE
You may have further questions about in-
stallation, operation, or troubleshooting.
Ifso,contactDESAInternational’s Techni-
calServiceDepartmentat 1-800-323-5190.
You can also visit DESA International’s
technical service web site at
www.desatech.com.
SERVICE
PUBLICATIONS
Youcanpurchaseaservicemanualfromthe
address listed on the back page of this
manual. Send a check for $5.00 payable to
DESA International.
SERVICE HINTS
When Gas Pressure is Too Low
• pilot will not stay lit
• burner(s) will have delayed ignition
• heater will not produce specified heat
• propane/LP gas supply may be low
When Gas Quality is Bad
• pilot will not stay lit
• burner(s) will produce flames and soot
• heater will backfire when lit
Youmayfeelyourgaspressureistoolowor
gas quality is bad. If so, contact your local
propane/LP gas supplier.
REPLACEMENT
PARTS
Note: Use only original replacement parts.
Thiswillprotectyourwarrantycoveragefor
parts replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealer from whom you
purchased this product. If they are unable to
supply original replacement part(s), call
DESAInternational’sTechnicalServiceDe-
partmentat1-800-323-5190forinformation.
When contacting your dealer or DESA In-
ternational, have ready:
• your name
• your address
• model and serial numbers of your heater
• how heater was malfunctioning
• typeofgasused(propane/LPornaturalgas)
• purchase date
Usually,wewillaskyoutoreturnthedefec-
tive 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 International’s Parts
Department at 1-800-972-7879 for referral
information. When calling DESA Interna-
tional, have ready:
• model number of your heater
• the replacement part number

20
105567
INFRARED PROPANE/LP GAS HEATER
26
19
25
25
24
7
2
7
1
20
21 22 23
3
4
(See Detail)
ILLUSTRATED
PARTS
BREAKDOWN
FB-3B
Burner Assembly
11
10
6
16
7
9
14
7
13
12
8
17
15
5
4
18
18
18
5-1
5-2
ODS/Pilot Assembly