Desa GWRN10 Original instructions

VENT-FREE GAS HEATER
SAFETY INFORMATION AND
INSTALLATION MANUAL
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TM
WARNING: This is an unvented
gas-fired heater. It uses air (oxy-
gen) from the room in which it is
installed.Provisionsforadequate
combustion and ventilation air
mustbeprovided.Referto AirFor
Combustion and Ventilation on
page 4 of this manual.
WARNING: Improper installa-
tion,adjustment,alteration,ser-
vice,ormaintenancecancause
injury or property damage. Re-
fer to this manual for correct
installationandoperationalpro-
cedures. For assistance or ad-
ditional information consult a
qualified installer, service
agency, or the gas supplier.
This appliance may be installed in an aftermarket*, permanently located, manufactured (mobile)
home, where not prohibited by local codes.
This appliance is only for use with the type of gas indicated on the rating plate. This appliance
is not convertible for use with other gases.
*Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
WARNING: If the information in this manual is not
followedexactly, afire orexplosion mayresult caus-
ing property damage, personal injury, or loss of life.
— Donotstoreorusegasolineorotherflammable
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.
• Ifyoucannotreachyourgassupplier,callthe
fire department.
— Installation and service must be performed by
a qualified installer, service agency, or the gas
supplier.
GWN6, GWP6
GWN10, GWP10
GWN10T, GWP10T
GWRN10 AND GWRP10

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SAFETY INFORMATION
WARNINGS
IMPORTANT: Read this owner’s manual carefully and
completely before trying to assemble, operate, or ser-
vicethis heater.Improper useof thisheater cancause
serious injury or death from burns, fire, explosion,
electrical shock, and carbon monoxide poisoning.
DANGER: Carbon monoxide poisoning may lead
to death!
Carbon Monoxide Poisoning: Early signs of carbon monoxide
poisoningresemble the flu, with headaches, dizziness, ornausea.If
you have these signs, the heater may not be working properly. Get
fresh air at once! Have heater serviced. Some people are more
affected by carbon monoxide than others. These include pregnant
women, persons with heart or lung disease or anemia, those under
the influence of alcohol, and those at high altitudes.
Natural and Propane/LP Gas: Natural and propane/LP gases are
fuel gases. Fuel gases are odorless. An odor-making agent is added
to fuel gases. The odor helps you detect a fuel gas leak. However,
the odor added to fuel gas can fade. Fuel gas may be present even
though no odor exists.
Make certain you read and understand all warnings. Keep this
manual for reference. It is your guide to safe and proper operation
of this heater.
WARNING: Any change to this heater or its
controls can be dangerous.
WARNING: Do not use any accessory not ap-
proved for use with this heater.
TABLE OF CONTENTS
SAFETY INFORMATION
Due to high temperatures, the appliance should be
located out of traffic and away from furniture and
draperies.
Do not place clothing or other flammable material on
ornear theappliance.Never placeany objects onthe
heater.
Surface of heater becomes very hot when running
heater. Keep children and adults away from hot sur-
face to avoid burns or clothing ignition. Heater will
remainhotforatimeaftershutdown.Allowsurfaceto
cool before touching.
Carefully supervise young children when they are in
the same room with heater.
Make sure grill guard is in place before running
heater.
Keepthe appliancearea clearand freefrom combus-
tiblematerials,gasoline,andotherflammablevapors
and liquids.
1. This appliance is only for use with the type of gas indicated on
the rating plate. This appliance is not convertible for use with
other gases.
2. Do not place propane/LP supply tank(s) inside any structure.
Locate propane/LP supply tank(s) outdoors.
3. Do not install 10,000 Btu units in a bathroom.
TABLE OF CONTENTS
SAFETY INFORMATION ............................................................ 2
UNPACKING ............................................................................... 3
PRODUCT IDENTIFICATION ..................................................... 3
PRODUCT FEATURES .............................................................. 3
LOCAL CODES........................................................................... 3
AIR FOR COMBUSTION AND VENTILATION ........................... 4
INSTALLATION ........................................................................... 6
OPERATING HEATER...............................................................11
INSPECTING BURNER ............................................................ 15
CLEANING AND MAINTENANCE ............................................ 16
TROUBLESHOOTING .............................................................. 17
ILLUSTRATED PARTS BREAKDOWNAND PARTS LIST ....... 20
SPECIFICATIONS .................................................................... 26
REPLACEMENT PARTS .......................................................... 27
SERVICE HINTS....................................................................... 27
TECHNICAL SERVICE ............................................................. 27
SERVICE PUBLICATIONS ....................................................... 27
ACCESSORY............................................................................ 27
PARTS CENTRALS .................................................................. 28
OWNER’S REGISTRATION FORM.......................................... 29
WARRANTY INFORMATION ...................................... Back Cover

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SAFETY INFORMATION
UNPACKING
PRODUCT IDENTIFICATION
PRODUCT FEATURES
LOCAL CODES
4. If you smell gas
• Shut off gas supply
• Do not try to light any appliance
• Do not touch any electrical switch; do not use any phone in
your building
• Immediately call your gas supplier from a neighbor’s phone.
Follow the gas supplier’s instructions
• If you cannot reach your gas supplier, call the fire department
5. This heater needs fresh, outside air ventilation to run properly.
This heater has an Oxygen Depletion Sensing (ODS) safety
shutoff system. The ODS shuts down the heater if not enough
fresh air is available. See Air for Combustion and Ventilation,
pages 4 and 5.
6. Keep all air openings in the front and bottom of heater clear and
freeofdebris.Thiswillinsureenoughairfor proper combustion.
7. If heater shuts off, do not relight until you provide fresh, out-
side air. If heater keeps shutting off, have it serviced.
8. Do not run heater
• where flammable liquids or vapors are used or stored
• under dusty conditions
9. Before using furniture polish, wax, carpet cleaner, or similar
products, turn heater off. If heated, the vapors from these prod-
ucts may create a white powder residue within burner box or
on adjacent walls or furniture.
10. Do not use heater if any part has been under water. Immedi-
ately call a qualified 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.
11. Turn off heater and let cool before servicing. Only a qualified
service person should service and repair heater.
12. Operating heater above elevations of 4,500 feet could cause
pilot outage.
13. To prevent performance problems, do not use propane/LP fuel
tank of less than 100 lbs. capacity.
UNPACKING
1. Remove heater from carton.
2. Removeallprotectivepackagingappliedtoheaterforshipment.
3. Check heater for any shipping damage. If heater is damaged,
promptly inform dealer where you bought heater.
SAFETY INFORMATION
Continued
PRODUCT IDENTIFICATION
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.
LOCAL CODES
Installanduseheaterwithcare. Followalllocalcodes.Intheabsence
oflocalcodes,usethelatest edition of National FuelGasCodeANSI
Z223.1/NFPA 54*.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
Figure 1 - Vent-Free Gas Heater
Blue Flame Heater
Control Knob
Piezo Ignitor
Button
Glass
Panel
Infrared Heater
Control Knob
Piezo Ignitor
Button
Grill
Guard
Front
Panel
Burners
Heater
Cabinet

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AIR FOR COMBUSTION AND
VENTILATION
WARNING: This heater shall not be installed in a
confined space or unusually tight construction un-
less provisions are provided for adequate combus-
tion and ventilation air. Read the following instruc-
tionstoinsureproperfresh airforthisandotherfuel-
burning appliances in your home.
Today’s homes are built more energy efficient than ever. New materi-
als, increased insulation, and new construction methods help reduce
heat loss in homes. Home owners weather strip and caulk around
windowsand doorstokeep thecoldairoutand thewarmair in.During
heatingmonths,home owners want their homesasairtightaspossible.
While it is good to make your home energy efficient, your home
needs to breathe. Fresh air must enter your home. All fuel-burning
appliances need fresh air for proper combustion and ventilation.
Exhaustfans,fireplaces,clothesdryers,andfuelburningappliances
drawairfromthehousetooperate.Youmustprovideadequatefresh
air for these appliances. This will insure proper venting of vented
fuel-burning appliances.
PROVIDING ADEQUATE VENTILATION
The following are excerpts from National Fuel Gas Code, ANSI
Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation.
All spaces in homes fall into one of the three following ventilation
classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 4 and 5 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.
Unusually tight construction is defined as construction
where:
a. walls and ceilings exposed to the outside atmosphere
have a continuous water vapor retarder with a rating of
one perm (6 x 10-11 kg per pa-sec-m2) or less with open-
ings gasketed or sealed
and
b. weather stripping has been added on openablewindows
and doors
and
c. caulking or sealants are applied to areas such as joints
around window and door frames, between sole plates
andfloors,betweenwall-ceiling joints,between wall pan-
els, at penetrations for plumbing, electrical, and gas
lines, and at other openings.
If your home meets all of the three criteria above, you must
provide additional fresh air. See
Ventilation Air From Out-
doors
, page 5 .
If your home does not meet all of the three criteria above,
proceedto
DeterminingFresh-AirFlowForHeaterLocation .
Confined and Unconfined Space
The National Fuel Gas Code, ANSI 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 m3per kw) of the aggregate input rating
of all appliances installed in that space and an unconfined space as
aspacewhosevolumeisnotlessthan50cubicfeetper1,000Btuper
hour (4.8 m3per kw) of the aggregate input rating of all appliances
installed in that space. Rooms communicating directly with the
space in which the appliances are installed*, through openings not
furnishedwith doors, areconsidereda partoftheunconfined space.
* Adjoining rooms are communicating only if there are doorless
passageways or ventilation grills between them.
DETERMINING FRESH-AIR FLOW FOR
HEATER LOCATION
Determining if You Have a Confined or
Unconfined Space
Usethiswork sheet todetermineif you haveaconfined or unconfinedspace.
Space:Includestheroominwhichyouwillinstallheaterplusanyadjoining
rooms with doorless passageways or ventilation grills between the rooms.
1. Determine the volume of the space (length x width x height).
Length x Width x Height = ___________ cu. ft. (volume of space)
Example: Space size 22 ft. (length) x 18 ft. (width) x 8 ft. (ceiling
height) = 3168 cu. ft. (volume of space)
Ifadditionalventilation to adjoiningroomissupplied withgrillsoropen-
ings, add the volume of these rooms to the total volume of the space.
2. Multiply the space volume by 20 to determine the maximum Btu/Hr
the space can support.
__________ (volume of space) x 20 = (Maximum Btu/Hr the space
can support)
Example: 2560 cu. ft. (volume of space) x 20 = 51,200 (maximum
Btu/Hr the space can support)
AIR FOR COMBUSTION AND VENTILATION
Providing Adequate Ventilation
Determining Fresh-Air Flow For Heater Location

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WARNING: If the area in which the heater may be
operated is smaller than that defined as an uncon-
fined space or if the building is of unusually tight
construction,provideadequatecombustionandven-
tilation air by one of the methods described in the
National Fuel Gas Code, ANSI Z223.1/NFPA 54, Sec-
tion 5.3 or applicable local codes.
AIR FOR COMBUSTION AND
VENTILATION
Continued
40,000
10,000
50,000
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 com-
bustion air from the outdoors and vents to the outdoors.
Example:
Gas water heater _____________ Btu/Hr
Vent-free heater + _____________ Btu/Hr
Total = _____________ Btu/Hr
4. Compare the maximum Btu/Hr the space can support with the actual
amount of Btu/Hr used.
__________________ Btu/Hr (maximum the space can support)
__________________ Btu/Hr (actual amount of Btu/Hr used)
Example: 51,200 Btu/Hr (maximum the space can support)
50,000 Btu/Hr (actual amount of Btu/Hr used)
Thespace inthe above example is a confined space because theactual Btu/
HrusedismorethanthemaximumBtu/Hrthespacecansupport.Youmust
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 adjoining
roomor addventilation grillsbetween rooms.See VentilationAir From
Inside Building.
B. Vent room directly to the outdoors. See Ventilation Air From Outdoors.
C. InstallalowerBtu/Hrheater,iflowerBtu/Hrsizemakesroomunconfined.
If the actual Btu/Hr used is less than the maximum Btu/Hr the space can
support,thespaceisanunconfinedspace.Youwillneednoadditionalfresh
air ventilation.
AIR FOR COMBUSTION AND VENTILATION
Determining Fresh-Air Flow For Heater Location
Ventilation Air
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining unconfined space.
When ventilating to an adjoining unconfined space, you must
provide two permanent openings: one within 12" of the ceiling and
one within 12" of the floor on the wall connecting the two spaces
(see options 1 and 2, Figure 2). You can also remove door into
adjoining room (see option 3, Figure 2). Follow the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion
and Ventilation for required size of ventilation grills or ducts.
Ventilation Air From Outdoors
Provideextrafreshairbyusingventilationgrillsorducts.Youmust
provide two permanent openings: one within 12" of the ceiling and
one within 12" of the floor. Connect these items directly to the
outdoorsorspacesopentotheoutdoors.Thesespacesincludeattics
and crawl spaces. Follow the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation
for required size of ventilation grills or ducts.
IMPORTANT: Do not provide openings for inlet or outlet air into
attic if attic has a thermostat-controlled power vent. Heated air
entering the attic will activate the power vent.
Or
Remove
Door into
Adjoining
Room,
Option 3
Ventilation Grills
Into Adjoining Room,
Option 2
12"
12"
Ventilation
Grills
into Adjoining
Room,
Option 1
Figure 2 - Ventilation Air from Inside Building
Figure 3 - Ventilation Air from Outdoors
Outlet
Air Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic

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36"
3"
CEILING
Minimum
Minimum To
T
Of Car
p
etin
g
,
6" Blueflame
8" Plaque
Minimum
From
Sides Of
Heater
Right
Side
Left
Side
INSTALLATION
Check Gas Type
INSTALLATION
NOTICE: This heater is intended for use as supple-
mental heat. Use this heater along with your primary
heating system. Do not install this heater as your
primary heat source. If you have a central heating
system, you may run system’s circulating blower
while using heater. This will help circulate the heat
throughoutthehouse.Intheeventofapoweroutage,
you can use this heater as your primary heat source.
WARNING: A qualified service person must in-
stall heater. Follow all local codes.
CHECK GAS TYPE
Useonlythe correct typeofgas(natural or propane/LP).Ifyourgas
supply is not the correct gas type, do not install heater. Call dealer
where you bought heater for proper type heater.
INSTALLATION ITEMS
Beforeinstalling heater, makesureyou havetheitemslisted below.
• for propane/LP gas, external regulator (supplied by installer)
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve *
• ground joint union
• sediment trap
• tee joint
• pipe wrench
• for natural gas, test gauge connection*
* A CSA design-certified equipment shutoff valve with 1/8" NPT
tap is an acceptable alternative to test gauge connection. Purchase
the optional CSA design-certified equipment shutoff valve from
your dealer. See Accessory, page 29.
LOCATING HEATER
This heater is designed to be mounted on a wall.
WARNING: Maintain the minimum clearances
shown in Figure 4. If you can, provide greater clear-
ances from floor, ceiling, and joining wall.
WARNING: Never install the heater
•inabathroom(10,000Btu/hronly.6,000Btu/hr mod-
els are allowed in a bathroom. Check local codes.)
•in a recreational vehicle
•where curtains, furniture, clothing, or other flam-
mable objects are less than 36 inches from the
front, top, or sides of the heater
•as a fireplace insert
•in high traffic areas
•in windy or drafty areas
CAUTION: This heater creates warm air currents.
These currents move heat to wall surfaces next to
heater. Installing heater next to vinyl or cloth wall
coveringsoroperatingheaterwhereimpurities(such
asbutnotlimitedto,tobaccosmoke,aromaticcandles,
cleaning fluids, oil or kerosene lamps, etc.) in the air
exist, may discolor walls or cause odors.
IMPORTANT: Vent-free heaters add moisture to the air. Al-
thoughthisisbeneficial,installingheaterinroomswithoutenough
ventilationairmaycausemildewtoformfromtoomuchmoisture.
See Air for Combustion and Ventilation, pages 4 and 5.
CAUTION: If you install the heater in a home
garage
•heater pilot and burner must be at least 18 inches
above floor
•locate heater where moving vehicle will not hit it
For convenience and efficiency, install heater
• where there is easy access for operation, inspection, and service
• in coldest part of room
Figure4-MountingClearancesAsViewedFromFrontofHeater
Minimum To Top Surface
Of Carpeting, Tile Or Other
Combustible Material

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INSTALLATION
Installation Items
Locating Heater
Installing Heater To Wall
INSTALLATION
Continued
Figure 5 - Mounting Screw Locations
Mounting
Screw
Locations
8 7/8"
Blue Flame
10 7/8" Plaque
Minimum To
Maintain 6"
Clearance
From Wall
7 3/4"
20 1/4"
Minimum To
Maintain 3"
Clearance
From Floor
FLOOR
JOINING WALL
INSTALLING HEATER TO WALL
Marking Screw Locations
1. Determine where you will locate heater.
WARNING: Maintainminimum clearancesshown
in Figure 5. If you can, provide greater clearances
from floor and joining wall.
2. Mark two mounting screw locations on wall (see Figure 5).
Installing Two Mounting Screws
Note: Wallanchorsandmounting screws are in hardware package.
The hardware package is provided with heater.
Attaching to wall stud method
For attaching mounting screw to wall stud
1. Drill hole at marked location using 9/64" drill bit.
2. Insert mounting screw into wall stud.
3. Tighten screw until 1/16" space (thickness of penny) is be-
tween screwhead and wall.
Attaching to wall anchor method
Followinstructionsbelow toattachmountingscrews tohollowwalls
(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 1/4" deep.
2. Fold wall anchor (see Figure 6).
Figure 6 - Folding Anchor
Thin Walls (1/4" to 1/2" thick)
Figure7-PoppingOpenAnchor
Wings For Thin Walls
Figure 8 - Tightening Anchors
Thin or
Thick Wall
(thick wall
shown)
Solid
Wall
1/16"
Space
Placing Heater On Mounting Screws
1. Locate two keyhole slots on back panel of heater (see Figure 9).
2. Place large openings of slots over screwheads. Slide heater
down until screws are in small portion of slots.
Figure 9 - Location Of Keyhole Slots On Back Panel Of Heater
Keyhole Slots
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 7).
IMPORTANT: Do not hammer key! For thick walls (over 1/2"
thick) or solid walls, do not pop open wings.
5. Tighten two screws until 1/16" space (thickness of penny) is
between screwheads and wall (see Figure 8).

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Figure 11 - Installing Bottom Mounting Screw
CONNECTING TO GAS SUPPLY
WARNING: This appliance requires a 3/8" NPT
(National Pipe Thread) inlet connection to the pres-
sure regulator.
WARNING: A qualified service person must con-
nect heater to gas supply. Follow all local codes.
WARNING:Fornaturalgas,neverconnectheaterto
private (non-utility) gas wells. This gas is commonly
known as wellhead gas.
IMPORTANT :For natural gas, check gas line pressure before
connectingheatertogasline.Gaslinepressuremustbenogreaterthan
14 inches of water. If gas line pressure is higher, heater regulator
damage could occur.
CAUTION: For propane/LP gas, never connect
heater directly to the propane/LP supply. This heater
requires an external regulator (not supplied). Install
the external regulator between the heater and pro-
pane/LP supply.
INSTALLATION
Installing Heater To Wall (Cont.)
Connecting To Gas Supply
Forpropane/LPgas,the installer must supply an external regulator.
Theexternalregulatorwillreduceincominggaspressure.Youmust
reduceincominggaspressuretobetween11and14inchesofwater.
Ifyoudonotreduceincominggaspressure,heaterregulatordamage
could occur. Install external regulator with the vent pointing down
as shown in Figure 12. Pointing the vent down protects it from
freezing rain or sleet.
CAUTION: Use only new, black iron or steel pipe.
Internally-tinned copper tubing may be used in cer-
tain areas. Check your local codes. Use pipe of large
enoughdiametertoallowpropergasvolumetoheater.
If pipe is too small, undue loss of volume will occur.
Propane/LP
Supply Tank
Figure 12 - External Regulator With Vent Pointing Down
(propane/LP systems only)
External Regulator
Vent Pointing Down
Removing Front Panel Of Heater
1. Remove two screws near bottom corners of front panel.
2. Lift straight up on grill guard until it stops. Grill guard will slide
up about 1/4".
3. Pull bottom of front panel forward, then down.
Figure 10 - Removing Front Panel Of Heater
Installing Bottom Mounting Screw
1. Locate bottom mounting hole. This hole is nearbottomon back
panel of heater (see Figure 11).
2. Mark screw location on wall.
3. Remove heater from wall.
4. If installing bottom mounting screw into hollow or solid wall,
install wall anchor. Follow steps 1 through 5 under Attaching To
Wall AnchorMethod, page7.Ifinstalling bottommountingscrew
into wall stud, drill hole at marked location using 9/64" drill bit.
5. Replace heater on wall.
6. Insert bottom anchor screw through back panel into bottom
anchor or drilled hole (see Figure 11).
7. Tighten screw until heater is firmly 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 9 and 10).
INSTALLATION
Continued

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INSTALLATION
Continued
INSTALLATION
Connecting To Gas Supply (Cont.)
Checking Gas Connections
Figure 13 - Gas Connection
* A CSA design-certified equipment shutoff valve with 1/8" NPT
tap is an acceptable alternative to test gauge connection. Purchase
the optional CSA design-certified equipment shutoff valve from
your dealer. See Accessory, page 29.
We recommend that you install sediment trap in supply line as
showninFigure13.Locatesedimenttrapwhereitiswithinreachfor
cleaning. Install in piping system between fuel supply and heater.
Locatesediment trap where trapped matter is notlikelyto 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 con-
necting it to gas piping and/or fittings. Do not over tighten pipe
connection to regulator. The regulator body could be damaged.
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Test
Gauge
Connection*
Tee
Joint
Pipe
Nipple
Cap
Pressure
Regulator
Heater
Cabinet
3/8" NPT
Pipe Nipple
Ground
Joint Union
Sediment
Trap
3" Minimum
Natural Gas
From Gas Meter
(4" W.C. to 10.5"
W.C. Pressure)
Propane/LP
From External
Regulator
(11" W.C. to 14"
W.C. Pressure)
Equipment
Shutoff Valve*
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping and connections
forleaksafterinstallingorservicing.Correctallleaks
at once.
WARNING: Never use an open flame to check for
aleak.Applyanoncorrosiveleakdetectionfluidtoall
joints.Bubblesformingshowaleak.Correctallleaks
at once.
CAUTION: For propane/LP gas, make sure exter-
nalregulatorhasbeeninstalled betweenpropane/LP
supply and heater. See guidelines under Connecting
to Gas Supply , pages 8 and 9.
Pressure Testing Gas Supply Piping System
Test Pressures In Excess Of 1/2 PSIG (3.5 kPa)
1. Disconnect appliance with its appliance main gas valve (control
valve) and equipment shutoff valve from gas supply piping sys-
tem. Pressures in excess of 1/2 psig will damage heater regulator.
2. Cap off open end of gas pipe where equipment shutoff valve
was connected.
3. Pressurize supply piping system by either opening propane/LP
supplytankvalveforpropane/LPgasoropeningmaingasvalve
located on or near gas meter for natural gas, or using com-
pressed air.
4. Check all joints of gas supply piping system.Apply a noncorrosive
leak detection fluid to all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff valve to gas supply.
Check reconnected fittings for leaks.
Installationmustincludeequipmentshutoffvalve,union,andplugged
1/8" NPT tap. Locate NPT tap within reach for test gauge hook up.
NPT tap must be upstream from heater (see Figure 13).
IMPORTANT: Install an equipment shutoff valve in an accessible
location. The equipment shutoff valve is for turning on or shutting
off the gas to the appliance.
Apply pipe joint sealant lightly to male NPT threads. This will
prevent excess sealant from going into pipe. Excess sealant in pipe
could result in clogged heater valves.
WARNING:Use pipejoint sealantthat isresistant
to liquid petroleum (LP) gas.

107902-01D
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ON
POSITI
O
O
F
POS
I
Figure 14 - Equipment Shutoff Valve
Equipment
Shutoff Valve Open
Closed
Propane/LP
Supply Tank Control
Valve Location
Figure 16 - Checking Gas Joints for Propane/LP Gas
Figure 15 - Checking Gas Joints for Natural Gas
Control Valve Location
Gas
Meter
Equipment
Shutoff Valve
INSTALLATION
Continued
INSTALLATION
Checking Gas Connections (Cont.)
Equipment
Shutoff Valve
Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 14).
2. Pressurize supply piping system by either opening propane/LP
supply tank valve for propane/LP gas or opening main gas
valve located on or near gas meter for natural gas, or using
compressed air.
3. Check all joints from gas meter for natural or propane/LP
supply to equipment shutoff valve (see Figure 15 or 16).
Apply a noncorrosive leak detection fluid to all joints. Bubbles
forming show a leak.
4. Correct all leaks at once.
Pressure Testing Heater Gas Connections
1. Open equipment shutoff valve (see Figure 14).
2. Open main gas valve located on or near gas meter for natural
gas or open propane/LP supply tank valve.
3. Make sure control knob of heater is in the OFF position.
4. Check all joints from equipment shutoff valve to control valve
(see Figures 15 and 16). Apply a noncorrosive leak detection
fluid to all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light heater (see Operating Heater pages 11 through 14).
Check the rest of the internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to Appliance, pages 12,
13 or 14, depending on your model).
8. Replace front panel.

107902-01D
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OPERATING HEATER
FOR YOUR SAFETY READ
BEFORE LIGHTING
WARNING:Ifyoudonotfollowtheseinstructions
exactly, a fire or explosion may result causing prop-
erty damage, personal injury or loss of life.
A. This appliance has a pilot which must be lighted by hand.
When lighting the pilot, follow these instructions exactly.
B. BEFORE LIGHTING smell all around the appliance area
for gas. Be sure to smell next to the floor because some gas
is heavier than air and will settle on the floor.
WHAT TO DO IFYOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any phone in
your building.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire de-
partment.
C. Useonly yourhandto pushin or turnthegas control knob.
Never use tools. If the knob will not push in or turn by
hand, don’t try to repair it, call a qualified service techni-
cian or gas supplier. Force or attempted repair may result
in a fire or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect the
appliance and to replace any part of the control system and
any gas control which has been under water.
LIGHTING
INSTRUCTIONS
1. STOP! Read the safety information above.
2. Make sure equipment shutoff valve is fully open.
3. Turn control knob clockwise
Clockwise
to the OFF position.
4. Wait five (5) minutes to clear out any gas. Then smell for
gas, including near the floor. If you smell gas, STOP! Fol-
low “B”in the safety information, above.If you don’t smell
gas, go to the next step.
5. Press in control knob and turn counterclockwise C-clockwise
to the PILOT position. Keep control knob pressed in for
five (5) seconds (see Figure 17).
Note: You may be running this heater for the first time
after hooking up to gas supply. If so, the control knob may
need to be pressed in for 30 seconds or more. This will al-
low air to bleed from the gas system.
MANUAL CONTROL BLUE FLAME
MODELS
OPERATING HEATER (Manual Control Blue Flame Models)
For Your Safety Read Before Lighting
Lighting Instructions
• If control knob does not pop up when released, contact a
qualified service person or gas supplier for repairs.
6. With control knob pressed in, push down and release igni-
tor button.This will light pilot.The pilot is attached to the
frontof burner.Ifneeded,keeppressingignitorbuttonuntil
pilot lights.
Note: If pilot does not stay lit, refer to Troubleshooting,
pages 17 through 19. Also contact a qualified service per-
sonorgas supplier forrepairs.Until repairsaremade,light
pilot with match. To light pilot with match, see Manual
Lighting Procedure, page 12.
7. Keep control knob pressed in for 30 seconds after lighting
pilot. After 30 seconds, release control knob.
Note: If pilot goes out, repeat steps 3 through 7.
8. Turn control knob counterclockwise C-clockwise to the HIGH
position. The main burner should light. Set control knob
to any heat level between HIGH and LOW. To turn control
knob from HIGH to a lower setting, press in the control
knob and turn counterclockwise C-clockwise .
Note: BothHIGHandLOWarelockedpositions.You must
pressin controlknob beforeturningitfromthesepositions.
OFF
HIGH
PILOT
LOW
IGNITOR
CAUTION: Do not try to adjust heating levels by
using the equipment shutoff valve.
Thermocouple Pilot Burner
Figure 18 - Pilot
Ignitor Electrode
Figure 17 - Control Knob In The OFF Position
Ignitor Button Control Knob

107902-01D
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OFF
PILOT
IGNITOR
LOW
HIGH
OPERATING HEATER
Continued
TO TURN OFF GAS
TO APPLIANCE
1. Remove front panel (see Figure 10, page 8).
2. Follow steps 1 through 5 under Lighting Instructions,
page 11.
3. With control knob pressed in, strike match. Hold match to
pilot until pilot lights.
4. Keep control knob pressed in for 30 seconds after pilot is
lit. After 30 seconds, release control knob. Follow step 8
under Lighting Instructions, page 11.
5. Replace front panel.
Shutting Off Heater
1. Turncontrolknobclockwise
Clockwise
tothePILOTposition.
2. Press in control knob and turn clockwise
Clockwise
to the
OFF position.
Shutting Off Burner Only (pilot stays lit)
Turn control knob clockwise
Clockwise
to the PILOT position.
MANUAL CONTROL INFRARED MODELS
1. STOP! Read the safety information starting in columm 1.
2. Make sure equipment shutoff valve is fully open.
3. Turn control knob clockwise to the OFF position.
4. Wait five (5) minutes to clear out any gas. Then smell for
gas, including near the floor. If you smell gas, STOP! Fol-
low “B” in the safety information, starting column 1. If
you don’t smell gas, go to the next step.
5. Press in control knob, and turn counterclockwise to
pilot position. Keep control knob pressed for five seconds.
Note: You may be running this heater for the first time
after hooking up to gas supply. If so, the control knob may
need to be pressed in for 30 seconds or more . This will
allow air to bleed from the gas system.
• If control knob does not pop up when released, contact a
qualified service person or gas supplier for repairs.
6. With control knob pressed in, push down and release ignitor
button.This will light pilot. The pilot is attached to the front of
burner.Ifneeded,keeppressingignitorbuttonuntilpilotlights.
Note: Ifpilot does notlight,refertoTroubleshooting,pages
17 through 19. Also contact a qualified service person or
gas supplier for repairs. Until repairs are made, light pilot
with match, see Manual Lighting Procedure, page 13.
7. Keep control knob pressed in for 10 seconds after lighting
pilot. After 10 seconds, release control knob.
Note: If pilot goes out, repeat steps 3 through 7.
Figure 20 - PilotFigure 19 - Control Knob In
The OFF Position
MANUAL LIGHTING
PROCEDURE
Piezo Ignitor
Button Control Knob Thermocouple
Ignitor Electrode
Pilot
Burner
OPERATING HEATER (Manual Control Blue Flame Models)
To Turn Off Gas To Appliance
Manual Lighting Procedure
OPERATING HEATER (Manual Control Infrared Models)
For Your Safety Read Before Lighting
Lighting Instructions
FOR YOUR SAFETY READ
BEFORE LIGHTING
WARNING:Ifyoudonotfollowtheseinstructions
exactly, a fire or explosion may result causing prop-
erty damage, personal injury or loss of life.
A. This appliance has a pilot which must be lighted by hand.
When lighting the pilot, follow these instructions exactly.
B. BEFORE LIGHTING smell all around the appliance area
for gas. Be sure to smell next to the floor because some gas
is heavier than air and will settle on the floor.
WHAT TO DO IFYOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any phone in
your building.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire de-
partment.
C. Useonly yourhandto pushin or turnthe gascontrolknob.
Never use tools. If the knob will not push in or turn by
hand, don’t try to repair it, call a qualified service techni-
cian or gas supplier. Force or attempted repair may result
in a fire or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect the
appliance and to replace any part of the control system and
any gas control which has been under water.
LIGHTING
INSTRUCTIONS

107902-01D
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LOW
OFF
PILOT
HIGH
OFF
PILOT
OFF
WARNING:Whenrunningheater,setcontrol knob
at LOW or HIGH locked positions. Never set control
knobbetweenlockedpositions.Poorcombustionand
higher levels of carbon monoxide may result.
CAUTION: Do not try to adjust heating levels by
using the equipment shutoff valve.
1. Slightly press in control knob and turn
counterclockwise to the LOW or HIGH positions.
IMPORTANT: Release downward pressure while turning
control knob. Control knob will lock at the desired position.
OPERATING HEATER
Continued
TO SELECT
HEATING LEVEL
Control
Knobs Burners
Figure 21 - Burner Patterns
Shutting Off Heater
Turn control knob clockwise to the OFF position.
Shutting Off Burner Only (pilot stays lit)
Turn control knob clockwise to the PILOT position.
TO TURN OFF GAS
TO APPLIANCE
OPERATING HEATER (Manual Control Infrared Models)
To Select Heating Level
To Turn Off Gas To Appliance
Manual Lighting Procedure
OPERATING HEATER (Thermostat Control Blue Flame and Infrared Models)
For Your Safety Read Before Lighting
1. Remove front panel (see Figure 10, page 8).
2. Follow steps 1 through 5 under Lighting Instructions,
page 12.
3. With control knob pressed in, strike match. Hold match to
pilot until pilot lights.
4. Keep control knob pressed in for 10 seconds after pilot is
lit. After 10 seconds, release control knob.
5. Replace front panel.
THERMOSTAT CONTROL BLUE FLAME
AND INFRARED MODELS
FOR YOUR SAFETY READ
BEFORE LIGHTING
WARNING:Ifyoudonotfollowtheseinstructions
exactly, a fire or explosion may result causing prop-
erty damage, personal injury or loss of life.
A. This appliance has a pilot which must be lighted by hand.
When lighting the pilot, follow these instructions exactly.
B. BEFORE LIGHTING smell all around the appliance area
for gas. Be sure to smell next to the floor because some gas
is heavier than air and will settle on the floor.
WHAT TO DO IFYOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any phone in
your building.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire de-
partment.
C. Useonly yourhandto pushin or turnthegas control knob.
Never use tools. If the knob will not push in or turn by
hand, don’t try to repair it, call a qualified service techni-
cian or gas supplier. Force or attempted repair may result
in a fire or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect the
appliance and to replace any part of the control system and
any gas control which has been under water.
MANUAL LIGHTING
PROCEDURE

107902-01D
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IGNITOR
PILOT
LO
OFF
HI
CAUTION: Do not try to adjust heating levels by
using the equipment shutoff valve.
Figure 22 - Control Knob In
The OFF Position Figure 23 - Pilot
Shutting Off Heater
1. Turn control knob clockwise
Clockwise
to the OFF position.
2. Turn off all electric power to the appliance if service is to
be performed.
Shutting Off Burner Only (pilot stays lit)
Turn control knob clockwise
Clockwise
to the PILOT position.
OPERATING HEATER
Continued
1. Remove front panel (see Figure 10, page 8).
2. Follow steps 1 through 5 under Lighting Instructions.
3. With control knob pressed in, strike match. Hold match to
pilot until pilot lights.
4. Keep control knob pressed in for 30 seconds after lighting
pilot.After 30 seconds, release control knob. Follow step 8
under Lighting Instructions.
5. Replace front panel.
The thermostatic control used on these models differs from
standardthermostats.Standardthermostatssimplyturnonand
off the burner. The thermostat used on this heater senses the
room temperature. The thermostat adjusts the amount of gas
flow to the burner. This increases or decreases the burner flame
height. At times the room may exceed the set temperature. If so,
theburnerwillshutoff.Theburnerwillcyclebackonwhenroom
temperature drops below the set temperature. The control knob
can be set to any heat level between HI and LO.
Note: Thethermostat sensingbulbmeasuresthetemperatureof
airneartheheatercabinet.Thismaynotalwaysagreewithroom
temperature (depending on housing construction, installation
location,roomsize, open airtemperatures,etc.). Frequent useof
your heater will let you determine your own comfort levels.
THERMOSTAT
CONTROL OPERATION
1. STOP! Read the safety information, page 13, column 2.
2. Make sure equipment shutoff valve is fully open.
3. Turn control knob clockwise
Clockwise
to the OFF position
(see Figure 22).
4. Wait five (5) minutes to clear out any gas. Then smell for
gas, including near the floor. If you smell gas, STOP! Fol-
low “B” in the safety information, page 13, column 2. If
you don’t smell gas, go to the next step.
5. Turncontrolknob counterclockwise
C-clockwise
tothePILOT
position. Press in control knob for five (5) seconds
(see Figure 22).
Note: You may be running this heater for the first time
after hooking up to gas supply. If so, the control knob may
need to be pressed in for 30 seconds or more. This will al-
low air to bleed from the gas system.
6. With control knob pressed in, push down and release igni-
tor button. This will light pilot. The pilot is attached to the
frontofburner.Thepilotcanbeseenthroughtheglass panel.
If needed, keep pressing ignitor button until pilot lights.
Note: If pilot does not stay lit, refer to Troubleshooting,
pages 17 through 19. Also contact a qualified service per-
sonorgas supplier forrepairs.Until repairsaremade,light
pilot with match. To light pilot with match, see Manual
Lighting Procedure.
7. Keep control knob pressed in for 30 seconds after lighting
pilot. After 30 seconds, release control knob.
• If control knob does not pop up when released, contact a
qualified service person or gas supplier for repairs.
Note: Ifpilot goesout, repeatsteps3through7.Thisheater
has a safety interlock system. Wait one (1) minute before
lighting pilot again.
8. Turn control knob counterclockwise
C-clockwise
to desired
heating level. The main burner should light. Set control
knob to any heat level between HI and LO.
Control Knob
Ignitor Button Pilot Burner
Ignitor Electrode
Thermocouple
OPERATING HEATER (Thermostat Control Blue Flame and Infrared Models)
Lighting Instructions
To Turn Off Gas To Appliance
Thermostat Control Operation
Manual Lighting Procedure
LIGHTING
INSTRUCTIONS
TO TURN OFF GAS
TO APPLIANCE
MANUAL LIGHTING
PROCEDURE

107902-01D
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GRH/OV 007GOOD PILOT/LP
GRH/OV 008BAD PILOT/LP
1/2 GLASS HEIGHT
1/2 GLASS HEIGHT
INSPECTING BURNER
Check pilot flame pattern and burner flame pattern often.
PILOT FLAME PATTERN
Figure 24 shows a correct pilot flame pattern. Figure 25 shows an
incorrectpilotflamepattern.Theincorrectpilotflameisnottouching
thethermocouple.Thiswillcausethethermocoupletocool.Whenthe
thermocouple cools, the heater will shut down.
If pilot flame pattern is incorrect, as shown in Figure 25
• turn heater off (see To Turn Off Gas to Appliance, pages 12, 13
or 14 depending on your model)
• see Troubleshooting, pages 17 through 19
Note: The pilot flame on natural gas units will have a slight curve,
but flame should be blue and have no yellow or orange color.
Figure25-IncorrectPilotFlame
Pattern
Figure24- Correct PilotFlame
Pattern
BURNER FLAME PATTERN
BLUE FLAME MODELS
Figure26 shows a correct burner flame pattern.Figure27shows an
incorrect burner flame pattern. The incorrect burner flame pattern
shows yellow tipping of the flame. It also shows the flame higher
than 1/2 the glass panel height.
WARNING: If yellow tipping occurs, your heater
could produce increased levels of carbon monoxide.
If burner flame pattern shows yellow tipping, proceed
with the following instructions.
NOTICE: Do not mistake orange flames with yellow
tipping. Dust or other fine particles enter the heater
and burn causing brief patches of orange flame.
If burner flame pattern is incorrect, as shown in Figure 27
• turn heater off (see To Turn Off Gas to Appliance, pages 12 or
14 depending on your model)
• see Troubleshooting, pages 17 through 19
Thermocouple
Pilot Burner
Thermocouple
Pilot
Burner
Figure 26 - Correct Burner Flame Pattern
Yellow
Tipping
Figure 27 - Incorrect Burner Flame Pattern
(Models GWN6 and GWP6 will be lower
due to lower input rating)
INSPECTING BURNER
Pilot Flame Pattern
Burner Flame Pattern Blue Flame Models
Burner Flame Pattern Infrared Models
BURNER FLAME PATTERN
INFRARED MODELS
Figure28 shows a correct burner flame pattern.Figure29shows an
incorrect burner flame pattern.
If burner flame pattern is incorrect, as shown in Figure 29
• turn heater off (see To Turn Off Gas to Appliance, page 13 or 14)
• see Troubleshooting, pages 17 through 19
Figure 29 - Incorrect Burner
Flame Pattern
Figure 28 - Correct Burner
Flame Pattern

107902-01D
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CLEANING AND
MAINTENANCE
WARNING: Turn off heater and let cool before
cleaning.
CAUTION: You must keep control areas, burner,
and circulating air passageways of heater clean. In-
spect these areas of heater before each use. Have
heater inspected yearly by a qualified service person.
Heatermayneedmorefrequentcleaningduetoexces-
sivelintfromcarpeting,beddingmaterial,pethair,etc.
ODS/PILOT AND BURNER ORIFICE
• Use a vacuum cleaner, pressurized air, or small, soft bristled
brush to clean.
CLEANING BURNER PILOT AIR INLET HOLE
Theprimary airinletholesallowthe properamountofairto mixwith
the gas. This provides a clean burning flame. Keep these holes clear
of dust, dirt, lint, and pet hair. Clean these air inlet holes prior to each
heating season. Blocked air holes will create soot. We recommend
that you clean the unit every three months during operation and have
fireplace inspected yearly by a qualified service person.
We also recommend that you keep the burner tube and pilot
assembly clean and free of dust and dirt. To clean these parts we
recommendusingcompressedairnogreaterthan30PSI.Yourlocal
computer store, hardware store, or home center may carry com-
pressed air in a can. You can use a vacuum cleaner in the blow
position. If using compressed air in a can, please follow the direc-
tionsonthe can. Ifyoudon'tfollow directions on thecan,youcould
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.
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 cabinet to remove dust.
Figure 30 - Pilot Inlet Air Hole
Pilot Assembly
Pilot Air Inlet Hole
CLEANING AND MAINTENANCE
ODS/Pilot and Burner Orifice
Cleaning Burner Pilot Air Inlet Hole
Cabinet
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
airinletholeabouttwoinchesfromwherethepilotflamecomesout
ofthepilot assembly (see Figure30).Withtheunit off, lightly blow
airthroughtheairinlethole.Youmayblowthroughadrinkingstraw
if compressed air is not available.

107902-01D
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TROUBLESHOOTING WARNING: Turn off heater
andletcoolbeforeservicing.Only
aqualifiedservicepersonshould
service and repair heater.
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. Piezo ignitor nut is loose
6. Broken ignitor cable
7. Bad piezo ignitor
1. Gas supply turned off or equipment
shutoff valve closed
2. Control knob not in PILOT position
3. Control knob not pressed in while in
PILOT position
4. Air in gas lines when installed
5. Depleted gas supply (propane/LP only)
6. ODS/pilot is clogged
7. Gas regulator setting is not correct
1. Control knob not fully pressed in
2. Control knob not pressed in longenough
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
OBSERVED PROBLEM
When ignitor button is pressed, there is no
spark at ODS/pilot
When ignitor button is pressed, there is
spark at ODS/pilot but no ignition
ODS/pilot lights but flame goes out when
control knob is released
REMEDY
1. Replace pilot assembly
2. Replace pilot assembly
3. Reconnect ignitor cable
4. Free ignitor cable if pinched by any
metal or tubing. Keep ignitor cable dry
5. Tighten nut holding piezo ignitor to
heater cabinet. Nut is located inside
heater cabinet at top
6. Replace ignitor cable
7. Replace piezo ignitor
1. Turn on gas supply or open equipment
shutoff valve
2. Turn control knob to PILOT position
3. Press in control knob while in PILOT
position
4. Continue holding down control knob.
Repeat igniting operation until air is re-
moved
5. Contact local propane/LP gas company
6. Clean ODS/pilot (see Cleaning and
Maintenance, page 16) or replace ODS/
pilot assembly
7. Replace gas regulator
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) Contact local natural or propane/LP
gas company
B) Clean ODS/pilot (see Cleaning and
Maintenance, page 16) or replace ODS/
pilot assembly
6. Replace pilot assembly
7. Replace control valve
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.
Note: Alltroubleshootingitemsarelistedin
order of operation.
TROUBLESHOOTING

107902-01D
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OBSERVED PROBLEM
Burner does not light after ODS/pilot is lit
Delayed ignition of burner
Burner backfiring during combustion
Burner plaque(s) does not glow (Infrared
models only)
Yellow flame during burner combustion
Slightsmokeor odor during initial operation
Heater produces a whistling noise when
burner is lit
Heater produces a clicking/ticking noise
just after burner is lit or shut off
REMEDY
1. Clean burner orifice (see Cleaning and
Maintenance,page16) or replace burner
orifice
2. Contact local natural or propane/LP gas
company
1. Contact local natural or propane/LPgas
company
2. Clean burner orifice (see Cleaning and
Maintenance,page16) or replace burner
orifice
1. Clean burner orifice (see Cleaning and
Maintenance, page 16) or replace burner
orifice
2. Replace burner
3. Replace gas regulator
1. Turn control knob until it locks at de-
sired setting
2. Contact local natural or propane/LPgas
company
3. Replace burner
1. Check burner for dirt and debris. If
found, clean burner (see Cleaning and
Maintenance, page 16)
2. Contact local natural or propane/LPgas
company
3. Replace gas regulator
1. Problem will stop after a few hours of
operation
1. Turn control knob to LOW position and
let warm up for a minute
2. Operate burner until air is removed from
line. Have gas checked by local natural
or propane/LP gas company
3. Observe minimum installation clear-
ances (see Figure 4, page 7)
4. Clean burner (see Cleaning and Mainte-
nance, page 16) or replace burner orifice
1. This is common with most heaters. If
noise is excessive, contact qualified ser-
vice person
POSSIBLE CAUSE
1. Burner orifice is clogged
2. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orifice is clogged
1. Burner orifice is clogged or damaged
2. Burner damaged
3. Gas regulator defective
1. Controlknobset betweenlockedpositions
2. Inlet gas pressure is too low
3. Plaque damaged
1. Not enough air
2. Inlet gas pressure is too low
3. Gas regulator defective
1. Residues from manufacturing processes
1. Turning control knob to HIGH position
when burner is cold
2. Air in gas line
3. Air passageways on heater blocked
4. Dirty or partially clogged burner orifice
1. Metal expanding while heating or con-
tracting while cooling
TROUBLESHOOTING
Continued
TROUBLESHOOTING

107902-01D
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19
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For more information, visit www.desatech.com
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.
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.
OBSERVED PROBLEM
Whitepowderresidueformingwithinburner
box or on adjacent walls or furniture
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
POSSIBLE CAUSE
1. When heated, vapors from furniturepol-
ish, wax, carpet cleaners, etc. may turn
into white powder residue
1. Heater burning vapors from paint, hair
spray, glues, etc. (See IMPORTANT
statement above)
2. Low fuel supply (propane/LP only)
3. 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
REMEDY
1. Turn heater off when using furniture
polish, wax, carpet cleaners, or similar
products
1. Ventilate room. Stop using odor-causing
products while heater is running
2. Refill supply tank (propane/LP only)
3. Locate and correct all leaks (see Check-
ing Gas Connections, pages 9 and 10)
1. Open window and/or door for ventila-
tion
2. Contact local natural or propane/LP gas
company
3. Clean ODS/pilot (see Cleaning and
Maintenance, page 16)
1. Locate and correct all leaks (see Check-
ing Gas Connections, pages 9 and 10)
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, pages 9 and 10)
1. Refer to Fresh Air for Combustion and
Ventilation requirements (page 4)
TROUBLESHOOTING

107902-01D
20
For more information, visit www.desatech.com
For more information, visit www.desatech.com
GWP6
GWN6
GWP10
GWN10
ILLUSTRATED PARTS
BREAKDOWN
10
12
11
1
2
3
4
5
6
79
8
10
13 14
15
17
18
21 22
25
20
24
23
19
26
27
16
ILLUSTRATED PARTS BREAKDOWN
GWP6, GWN6, GWP10 and GWN10
PILOT