Comfort Glow CGN10A Quick start guide

Save this manual for future reference.
BLUE FLAME VENT-FREE NATURAL GAS
HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
MODELS: CGN10A AND CGN6
WARNING:Iftheinformationinthismanualisnotfollowedexactly,afireorexplosionmayresult
causing property damage, personal injury, or loss of life.
— Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the fire department.
— Installation and service must be performed by a qualified installer, service agency, or the
gas supplier.
WARNING: This is an unvented gas-fired heater. It uses air (oxygen) from the room in which it is
installed. Provisions for adequate combustion must be provided. Refer to page 3 of this manual.
This appliance may be installed in an aftermarket* manufactured (mobile) home, where not
prohibited by state or local codes.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
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
101870
NATURAL GAS HEATER
CGN10A AND CGN6
Carbon Monoxide Poisoning: Early
signs of carbon monoxide poisoning re-
semble the flu, with headaches, dizziness,
ornausea.Ifyouhavethesesigns,theheater
maynot beworking properly.Getfreshair
atonce!Haveheaterserviced.Somepeople
are more affected by carbon monoxide than
others. These include pregnant women,
peoplewithheartorlungdiseaseoranemia,
those under the influence of alcohol, and
those at high altitudes.
Natural Gas:Natural gas is odorless. An
odor-making agent is added to natural gas.
Theodorhelpsyoudetectanaturalgasleak.
However, the odor added to natural gas can
fade.Naturalgasmaybepresenteventhough
no odor exists.
Make certain you read and understand all
warnings.Keepthismanualforreference.It
isyourguidetosafeandproperoperationof
this heater.
SAFETY
INFORMATION
WARNINGS
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, oper-
ate, or service this heater. Im-
proper use of this heater can
causeseriousinjuryordeathfrom
burns, fire, explosion, and car-
bon monoxide poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
WARNING:Anychangetothis
heateror itscontrolscan bedan-
gerous.
1. This appliance is only for use with the
typeof gas indicated onthe rating plate.
Thisappliance is not convertible foruse
with other gases.
2. 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 build-
ing
• immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions
• ifyou cannot reach your gas supplier,
call the fire department
3. Heater model CGN10A shall not be
installed in a bathroom.
4. Never install the heater
• in a recreational vehicle
• wherecurtains, furniture, clothing, or
otherflammable objects are less than
36inches from the front, top,or sides
of the heater
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas
5. This heater needsfresh, outside air ven-
tilation to run properly.This heater has
an oxygen depletion sensor (ODS) pi-
lot light safety system. The ODS shuts
down the heater if not enough fresh air
is available. See Fresh Air for Combus-
tion and Ventilation, pages 3 through
5.
6. Keep all air openings in front and bot-
tom of heater clear and free of debris.
This will insure enough air for proper
combustion.
7. If heater shuts off, do not relight until
you provide fresh, outside 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. Never place any objects on the heater.
10. Surface of heater becomes very hot
whenrunningheater. Keep children and
adults away from hot surface to avoid
burns or clothing ignition. Heater will
remain hot for a time after shut-down.
Allow surface to cool before touching.
11. Carefully supervise young children
when they are in same room with
heater.
12. Make sure grill guard is in place be-
fore running heater.
13. 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.
14. Turn off heater and let cool before ser-
vicing. Only a qualified service person
should service and repair heater.
15. Operating heater above elevations of
4,500 feet could cause pilot outage.

3
101870
OWNER’S MANUAL
PRODUCT
IDENTIFICATION
Control Knob
LOCAL CODES
Install and use heater with care. Follow all
local codes. In the absence of local codes,
use the latest edition of The National Fuel
Gas Code ANSI 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
Heater
Cabinet
Grill
Guard
Glass
Panel
Front
Panel
Ignitor Button
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.
PRODUCT
FEATURES
Safety Device
This heater has a pilot with an Oxygen
Depletion Sensor Shutoff System (ODS).
TheODS/pilotisarequiredfeatureforvent-
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.
UNPACKING
Figure 1 - Vent-Free Natural Gas Heater (Model CGN10A Shown)
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
help reduce heat loss in homes. Home own-
ersweatherstripandcaulkaroundwindows
and doors to keep the cold air out and the
warm air in. During heating months, home
owners want their homes as airtight as pos-
sible.
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.
PROVIDING ADEQUATE
VENTILATION
ThefollowingisexerptsfromNationalFuel
Gas Code. NFPA 54/ANSI Z223.1, Section
5.3, Air for Combustion and Ventilation.
Allspacesinhomesfallintooneofthethree
following ventilation classifications:
1. Unusually Tight Contruction; 2. Uncon-
fined Space; 3. Confined Space.
The information on pages 4 and 5 will help
you classify your space and provide ad-
equate ventilation.
WARNING: This heater shall
not be installed in a confined
spaceunlessprovisionsarepro-
vided for adequate combustion
and ventilation air. Read the fol-
lowing instructions to insure
properfreshairforthisandother
fuel-burning appliances in your
home.
Continued

4
101870
NATURAL GAS HEATER
CGN10A AND CGN6
WARNING:Iftheareainwhich
the heater may be operated is
smaller than that defined as an
unconfined space, provide ad-
equate combustion and ventila-
tion air by one of the methods
described in the National Fuel
Gas Code, ANSI Z223.1, 1992,
Section 5.3 or applicable local
codes.
FRESH AIR FOR
COMBUSTION AND
VENTILATION
Continued
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
defined as construction where:
a.walls and ceilings exposed to
the outside atmosphere have a
continuous water vapor re-
tarder with a rating of one perm
(6x10-11 kg per pa-sec-m2) or
less with openings gasketed or
sealed and
b.weather stripping has been
added on openable windows
and doors and
c.caulking or sealants are ap-
plied to areas such as joints
around window and door
frames, between sole plates
and floors, between wall-ceil-
ing joints, between wall panels,
at penetrations for plumbing,
electrical, and gas lines, and at
other openings.
If your home meets all of the three
criteria above, you must provide ad-
ditional fresh air. See Ventilation Air
From Outdoors , page 5 .
If your home does not meet all of the
three criteria above, proceed to De-
termining Fresh-Air Flow For Heater
Location.
Confined and Unconfined Space
TheNationalFuelGasCode(ANSIZ2123.1,
1992 Section 5.3) defines a confined space
as a space whose volume is less than 50
cubicfeetper1,000Btuperhour(4.8m3per
kw) of the aggregate input rating of all
appliances installed in that space and an
unconfined space as a space whose volume
is not less than 50 cubic feet per 1,000 Btu
per hour (4.8 m3 per kw) of the aggregate
inputratingofallappliancesinstalledinthat
space.Roomscommunicatingdirectlywith
the space in which the appliances are in-
stalled*, through openings not furnished
with doors, are considered a part of the
unconfined space.
*Adjoiningroomsarecommunicatingonly
iftherearedoorlesspassagewaysorventila-
tion grills between them.
DETERMINING FRESH-AIR
FLOW FOR HEATER
LOCATION
Determining if You Have a
Confined or Unconfined Space
Usethisworksheetto determineifyou have
a confined or unconfined space.
Space: Includes the room in which you
will install heater plus any adjoining rooms
with doorless passageways or ventilation
grills between the rooms.
1. Determine the volume of the space
(length x width x height).
Length x Width x Height =
______ cu. ft. (volume of space)
Example: Space size
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 open-
ings, 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 sup-
port)
Example: 2560 cu. ft. (volume of
space) ÷50 cu. ft. = 51.2 or 51,200
(maximum Btu/Hr the space can sup-
port)
3. Add the Btu/Hr of all fuel burning ap-
pliances 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
Example: Gas water heater
44,000 Btu/Hr
Vent-free heater +6,000 Btu/Hr
Total = 50,000 Btu/Hr
* Do not include direct-vent gas appli-
ances. 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: 46,100 Btu/Hr (maximum
the space can support)
50,000 Btu/Hr (actual
amount of Btu/Hr used)
The space in the above example is a con-
fined space because the actual Btu/Hr used
ismorethanthemaximumBtu/Hrthespace
can support. You must provide additional
fresh air. Your options are as follows:
A. Reworkworksheet, adding the space of
an adjoining room. If the extra space
provides an unconfined space, remove
door to adjoining room or add ventila-
tion grills between rooms. See Ventila-
tion Air From Inside Building, page 5.
B. Vent room directly to the outdoors. See
Ventilation Air From Outdoors, page 5.
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
maximumBtu/Hrthespacecansupport,the
spaceisanunconfinedspace.Youwillneed
no additional fresh air ventilation.

5
101870
OWNER’S MANUAL
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
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.
Figure 2 - Ventilation Air from Inside Building
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/ANSI Z223.1, Section
5.3, Air for Combustion and Ventilation for
required size of ventilation grills or ducts.
Figure 3 - Ventilation Air from Outdoors
Outlet
Air Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
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.
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.

6
101870
NATURAL GAS HEATER
CGN10A AND CGN6
Continued
2. Mark two mounting screw locations on
wall (see Figure 5).
INSTALLING HEATER TO
WALL
Marking Screw Locations
1. Determine where you willlocate heater.
Figure 5 - Mounting Screw Locations
Mounting
Screw
Locations
8 7/8"
Minimum To
Maintain 6"
Clearance
From Wall
7 3/4"
20 1/4"
Minimum To
Maintain 3"
Clearance
From Floor
FLOOR
JOINING WALL
WARNING:Maintainminimum
clearances shown in Figure 5. If
you can, provide greater clear-
ancesfromfloorandjoiningwall.
For convenience and efficiency, install
heater
• where there is easy access for op-
eration, inspection, and service
• in coldest part of room
Figure4-MountingClearancesAsViewed
From Front of Heater
36"
3"
FLOOR
CEILING
Minimum
Minimum T
Of Carpeti
Combustib
6"
Minimum
From
Sides Of
Heater
Right
Side
Left
Side
INSTALLING TO
WALL
CHECK GAS TYPE
Use only natural gas. If your gas supply is
notnatural,donotinstallheater.Calldealer
where you bought heater for proper type
heater.
INSTALLATION ITEMS
Beforeinstallingheater,makesureyouhave
the items listed below:
• piping (check local codes)
• sealant (resistant to propane/LPgas)
• manual shutoff valve *
• ground joint union
• test gauge connection * (see Figure
12, page 8)
• sediment trap
• tee joint
• pipe wrench
NOTICE:Aqualifiedserviceper-
son must install heater. Follow
all local codes.
*AnA.G.A.design-certifiedmanualshutoff
valve with 1/8" NPT tap is an acceptable
alternative to test gauge connection. Pur-
chase the optional A.G.A. design-certified
manual shutoff valve from your dealer. See
Accessory, page 15.
LOCATING HEATER
This heater is designed to be mounted on a
wall.
WARNING:Maintainthemini-
mumclearancesshowninFigure
4.Ifyoucan,providegreaterclear-
ancesfromfloor,ceiling,andjoin-
ing wall.
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
IMPORTANT: Vent-freeheatersaddmois-
ture to the air. Although this is beneficial,
installing heater in rooms without enough
ventilation air may cause mildew to form
from too much moisture. See Fresh Air for
CombustionandVentilation,pages3through
5.
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 in the air (such
as tobacco smoke) exist, may
discolor walls.
WARNING: Never install the
heater
• ina bathroom (Model CGN10A
- Input 10,000 Btu’s)
• 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
Minimum To
Top Surface
Of Carpeting,
Tile Or Other
combustible
Material

7
101870
OWNER’S MANUAL
ANCHOR
Installing Two Mounting Screws
Note: Wall anchors and mounting screws
areinhardwarepackage.Thehardwarepack-
age is provided with heater.
Attaching to wall stud method
For attaching mounting screw to wall stud
1. Drillholeat marked location using9/64"
drill bit.
2. Insert mounting screw into wall stud.
3. Tighten screw until 1/16" space (thick-
ness of penny) is between screwhead
and wall.
Attaching to wall anchor
method
Follow instructions below to attach mount-
ing screws to hollow walls (wall areas be-
tween 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).
INSTALLING TO
WALL
Continued
Figure 8 - Tightening Anchors
1/16"
Space
Thin or
Thick Wall
(thick wall
shown)
Solid
Wall
Thin Walls
(1/4" to 1/2"
thick)
Figure 7 - Popping Open Anchor Wings
For Thin Walls
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!
Forthickwalls (over 1/2" thick)orsolid
walls, do not pop open wings.
Figure 6 - Folding Anchor
5. Tighten two screws until 1/16" space
(thickness of penny) is between
screwheads and wall (see Figure 8).
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 11 - Installing Bottom Mounting
Screw
Removing Front Panel Of Heater
1. Remove two screws near bottom cor-
ners of front panel.
2. Lift straight up on grill guard until it
stops.Grillguardwillslideupabout1/4".
3. Pull bottom of frontpanel forward, then
down.
Figure 10 - Removing Front Panel Of
Heater
Installing Bottom Mounting
Screw
1. Locate bottom mounting hole. This
hole is near bottom on 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 Anchor Method.
If installing bottom mounting screw
into wall stud, drill hole at marked lo-
cation using 9/64" drill bit.
5. Replace heater on wall.
6. Insert bottom anchor screw through
backpanelinto bottom anchor or drilled
hole (see Figure 11).
7. Tighten screw until heater is firmly se-
cured 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 8 and 9).
Keyhole Slots
Figure 9 - Location Of Keyhole Slots On
Back Panel Of Heater

8
101870
NATURAL GAS HEATER
CGN10A AND CGN6
IMPORTANT: Hold pressureregulatorwithwrenchwhenconnectingitto gas piping and/
or fittings.
* An A.G.A. design-certified manual shutoff valve with 1/8" NPT tap is an acceptable
alternativetotestgaugeconnection.PurchasetheoptionalA.G.A.design-certifiedmanual
shutoff valve from your dealer. See Accessory, page 15.
Tee
Joint
Pipe
Nipple
Cap
Pressure
Regulator
Heater
Cabinet
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Test
Gauge
Connection *
Ground Joint Union
3/8" NPT
Pipe
Nipple
Figure 12 - Gas Connection
Sediment Trap
3" Minimum
Manual Shutoff Valve *
From Gas
Meter
(4" W.C. to
10.5" W.C.
Pressure)
CONNECTING TO
GAS
SUPPLY
NOTICE: A qualified service per-
son must connect heater to gas
supply. Follow all local codes.
IMPORTANT: Check gas line pressure
before connecting heater to gas line. Gas
line pressure must be no greater than 14
inchesofwater.Ifgaslinepressureishigher,
heater regulator damage could occur.
Installation must include a manual shutoff
valve, ground joint 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 12).
Apply pipe joint sealant lightly to male
threads. This will prevent excess sealant
fromgoing into pipe. Excess sealantin pipe
could result in clogged heater valves.
Installsedimenttrapinsupplylineasshown
in Figure 12. Locate sediment trap where it
is within reach for cleaning. Locate sedi-
menttrapwheretrappedmatteris not likely
to freeze. A sediment trap traps moisture
and contaminants. This keeps them from
going into heater controls. If sediment trap
is not installed or is installed wrong, heater
may not run properly.
WARNING: Never connect
heater to private (non-utility) gas
wells. This gas is commonly
known as well-head gas.
CAUTION:Useonlynew,black
ironorsteelpipe.Internally-tinned
copper tubing may be used in
certain areas. Check your local
codes. Use pipe 3/8" diameter or
greater to allow proper gas vol-
umetoheater.Ifpipeistoo small,
undue loss of pressure will oc-
cur.
CAUTION:Usepipejointseal-
ant that is resistant to liquid pe-
troleum (LP) gas.

9
101870
OWNER’S MANUAL
Gas Meter
CHECKING GAS
CONNECTIONS
WARNING: Test all gas pip-
ing and connections for leaks
after installing or servicing. Cor-
rect all leaks at once.
WARNING:Neveruseanopen
flame to check for a leak. Apply a
mixture of liquid soap and water
to all joints. Bubbles forming
show a leak. Correct all leaks at
once.
PRESSURE TESTING GAS
SUPPLY PIPING SYSTEM
Test Pressures In Excess Of 1/2
PSIG
1. Disconnect heater and its individual
manual shutoff valve from gas supply
piping system. Pressures in excess of
1/2 psig will damage heater regulator.
2. Cap off open end of gas pipe where
manual shutoff valve was connected.
3. Pressurize supply piping system by ei-
ther using compressed air or opening
main gas valve located on or near gas
meter.
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.
Test Pressures Equal To or
Less Than 1/2 PSIG
1. Close manual shutoff valve (see Fig-
ure 13).
2. Pressurize supply piping system by ei-
ther using compressed air or opening
main gas valve located on or near gas
meter.
3. Check all joints from gas meter to
manual shutoff valve (see Figure 14).
Apply mixture of liquid soap and wa-
ter to gas joints. Bubbles forming show
a leak.
4. Correct all leaks at once.
PRESSURE TESTING
HEATER GAS
CONNECTIONS
1. Open manual shutoff valve (see Figure
13).
2. Open main gas valve located on or near
gas meter.
3. Make sure control knob of heater is in
the OFF position.
4. Check all joints from manual shutoff
valve to control valve (see Figure 14).
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,
pages 9 and 10). Check the rest of the
internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to
Appliance, page 10).
8. Replace front panel.
ON
POSITION
OFF
POSITION
Figure 13 - Manual Shutoff Valve
Manual
Shutoff
Valve
Open
Closed
Control Valve Location
Manual
Shutoff
Valve
Figure 14 - Checking Gas Joints
OPERATING
HEATER
FOR YOUR
SAFETY READ
BEFORE LIGHTING
WARNING: If you do not fol-
low these instructions exactly, a
fireorexplosionmayresultcaus-
ing property damage, personal
injury or loss of life.
A. Thisappliancehas a pilotwhichmust
belightedbyhand.When lightingthe
pilot, follow these instructions ex-
actly.
B. BEFORE LIGHTING smell all
aroundthe applianceareaforgas.Be
sureto smell nexttothe floorbecause
some gas is heavier than airand will
settle on the floor.
WHAT TO DO IF YOU SMELL
GAS
• Do not try to light any appliance.
• Do not touch any electric switch;
donotuseany phone inyourbuild-
ing.
• Immediatelycall yourgas supplier
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 yourhand to pushinorturn
thegascontrolknob.Neveruse tools.
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
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 un-
der water.

10
101870
NATURAL GAS HEATER
CGN10A AND CGN6
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. Turncontrol knob clockwise
to the PILOT position.
2. Pressin controlknobandturnclock-
wise to the OFF position.
Shutting Off Burner Only (pilot
stays lit)
1. Turncontrol knob clockwise
to the PILOT position.
4. Wait five (5) minutes to clear out any
gas. Then smell for gas, including
nearthefloor.Ifyousmell gas, STOP!
Follow “B” in the safety information
at the top of column 3, page 9. If you
don’t smell gas, go to the next step.
5. Press in control knob and turn coun-
terclockwise to the PILOT
position. Keep control knob pressed
inforfive(5) seconds(see Figure15).
Note: You may be running this
heater for the first time after hook-
ing up to gas supply. If so, the con-
trol knob may need to be pressed in
for 30 seconds. 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
downandreleaseignitorbutton.This
will light pilot. The pilot is attached
to the front of burner. The pilot can
be seen through the glass panel. If
needed, keep pressing ignitor button
until pilot lights.
Note: If pilot does not stay lit, refer
toTroubleshooting,pages 12through
14. Also contact a qualified service
person or gas supplier for repairs.
Until repairs are made, light pilot
withmatch.To lightpilotwith match,
see Manual Lighting Procedure.
Thermocouple Pilot Burner
Ignitor Electrode
Figure 16 - Pilot
CAUTION:Donottrytoadjust
heating levels by using the
manual shutoff valve.
LIGHTING
INSTRUCTIONS
1. STOP! Read the safety information
page 9, column 3.
2. Make sure manual shutoff valve is
fully open.
3. Turn control knob clockwise
to the OFF position.
OFF
HIGH
PILOT
LOW
IGNITOR
Ignitor Button Control Knob
Figure 15 - Control Knob In The OFF
Position
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
to the HIGH position. The
mainburnershould light. Setcontrol
knobtoanyheatlevelbetweenHIGH
andLOW.To turncontrolknobfrom
HIGH to a lower setting, press in the
controlknob and turncounterclock-
wise .
Note: Both HIGH and LOW are
locked positions. You must press in
control knob before turning it from
these positions. 1. Remove front panel (see Figure 10,
page 7).
2. Followsteps 1 through5 under Light-
ing Instructions.
3. With control knob pressed in, strike
match. Hold match to pilot until pi-
lot lights.
4. Keep control knob pressed in for 30
secondsafter pilot is lit.After 30 sec-
onds, release control knob.
5. Replace front panel.
MANUAL LIGHTING
PROCEDURE

11
101870
OWNER’S MANUAL
Check pilot flame pattern and burner flame
pattern often.
PILOT FLAME PATTERN
Figure 17 shows a correct pilot flame pat-
tern. Figure 18 shows an incorrect pilot
flame pattern. The incorrect pilot flame is
not touching the thermocouple. This will
cause the thermocouple to cool. When the
thermocouple cools, the heater will shut
down.
INSPECTING
BURNER
GRH/OV 009GOOD PILOT
Thermocouple
Pilot Burner
GRH/OV 010BAD PILOT
Pilot Burner
Thermocouple
Figure 17 - Correct Pilot Flame Pattern
Figure 18 - Incorrect Pilot Flame Pattern
If pilot flame pattern is incorrect, as shown
in Figure 18
• turn heater off (see To Turn Off Gas
to Appliance, page 10)
• see Troubleshooting, pages 12
through 14
1/2 GLASS HEIGHT
INCORRECT FLAME PATTERN
AT HIGH POSITION
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.
BURNER FLAME PATTERN
Figure 19 shows a correct burner flame
pattern.Figure20showsanincorrectburner
flame pattern. The incorrect burner flame
patternshowsyellowtippingoftheflame.It
also shows the flame higher than 1/2 the
glass panel height.
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide. If burner flame pat-
ternshowsyellowtipping,follow
instructions at bottom of this
page.
Ifburnerflamepatternisincorrect,asshown
in Figure 20
• turn heater off (see To Turn Off Gas
to Appliance, page 10)
• see Troubleshooting, pages 12
through 14
CORRECT FLAME PATTERN
AT HIGH POSITION
1/2 GLASS HEIGHT
Yellow
Tipping
(Model CGN6 will be lower due to
lower input rating)
Figure20-IncorrectBurnerFlamePattern
Figure 19 - Correct Burner Flame Pattern
(Model
CGN10A)
CLEANING AND
MAINTENANCE
ODS/PILOT AND BURNER
ORIFICE
• Use a vacuum cleaner, pressurized
air, or small, soft bristled brush to
clean.
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.
WARNING: Turn off heater
and let cool before cleaning.
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, etc.

12
101870
NATURAL GAS HEATER
CGN10A AND CGN6
TROUBLESHOOTING
Note: All troubleshooting items
are listed in order of operation.
WARNING: Turn off heater
andletcoolbeforeservicing.Only
aqualifiedservicepersonshould
service and repair heater.
CAUTION: Never use a wire,
needle, or similar object to clean
ODS/pilot.ThiscandamageODS/
pilot unit.
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
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 manual shutoff
valve closed
2. Control knob not in PILOT position
3. Control knob not pressed in while in PI-
LOT position
4. Air in gas lines when installed
5. ODS/pilot is clogged
6. Gas regulator setting is not correct
1. Control knob not fully pressed in
2. Control knob not pressed in longenough
3. Manual 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. 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 manual
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. Clean ODS/pilot (see Cleaning and
Maintenance, page 11) or replace ODS/
pilot assembly
6. Replace gas regulator
1. Press in control knob fully
2. After ODS/pilot lights, keep control
knob pressed in 30 seconds
3. Fully open manual shut-off valve
4. Hand tighten until snug, then tighten 1/
4 turn more
5. A) Contact local natural gas company
B) Clean ODS/pilot (see Cleaning and
Maintenance, page 11) or replace ODS/
pilot assembly
6. Replace thermocouple
7. Replace control valve
Continued

13
101870
OWNER’S MANUAL
TROUBLESHOOTING
Continued
OBSERVED PROBLEM
Burner does not light after ODS/pilot is lit
Delayed ignition of burner
Burner backfiring during combustion
Yellow flame during burner combustion
Slight smoke or odor during initial opera-
tion
Heater produces a whistling noise when
burner is lit
POSSIBLE CAUSE
1. Burner orifice is clogged
2. Burner orifice diameter is too small
3. 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. 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
REMEDY
1. Clean burner orifice (see Cleaning and
Maintenance,page 11)or replace burner
orifice
2. Replace burner orifice
3. Contact local natural gas company
1. Contact local natural gas company
2. Clean burner orifice (see Cleaning and
Maintenance,page 11)or replace burner
orifice
1. Clean burner orifice (see Cleaning and
Maintenance,page 11)or replace burner
orifice
2. Replace burner
3. Replace gas regulator
1. Check burner for dirt and debris. If
found, clean burner (see Cleaning and
Maintenance, page 11)
2. Contact local natural gas 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. Operateburner until air is removed from
line. Have gas checked by local natural
gas company
3. Observe minimum installation clear-
ances (see Figure 4, page 6)
4. Clean burner (see Cleaning and Main-
tenance, page 11) or replace burner ori-
fice.
Continued

14
101870
NATURAL GAS HEATER
CGN10A AND CGN6
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.
REMEDY
1. This is common with most heaters. If
noise is excessive, contact qualified ser-
vice person
1. Ventilate room. Stop using odor-causing
products while heater is running
2. Locate and correct all leaks (see Check-
ing Gas Connections, page 9)
1. Open window and/or door for ventila-
tion
2. Contact local natural gas company
3. Clean ODS/pilot (see Cleaning and
Maintenance, page 11)
1. Locate and correct all leaks ( see Check-
ing Gas Connections, page 9)
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 9)
1. Refer to Fresh Air for Combustion and
Venti-lation requirements (page 3)
OBSERVED PROBLEM
Heater produces a clicking/ticking noise
just after burner is lit or shut off
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. Metal expanding while heating or con-
tracting while cooling
1. Heater burning vapors from paint, hair
spray, glues, etc. See IMPORTANT
statement above
2. Gas leak. See Warning 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. See Warning statement at
top of page
2. Control valve defective
1. Foreign matter between control valve
and burner
2. Gas leak. See Warning statement at
top of page
1. Not enough combustion/ventilation air.
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.

15
101870
OWNER’S MANUAL
TECHNICAL
SERVICE
You may have further questions about in-
stallation, operation, or troubleshooting.
Ifso,contactDESAInternational’sTechni-
calServiceDepartmentat1-800-323-5190.
CGN6 CGN10A
Btu (Variable) 4,400/6,000 5,000/10,000
Type Gas Natural Only Natural Only
Ignition Piezo Piezo
Pressure Regulator Setting 3" W.C. 3" W.C.
Inlet Gas Pressure (inches of water)
Maximum 10.5" 10.5"
Minimum 4" 4"
Dimensions, Inches (H x W x D)
Heater 20 1/2 x 13 1/2 x 5 20 1/2 x 13 1/2 x 5
Carton 25 x 16 11/16 x 7 1/2 25 x 16 11/16 x 7 1/2
Weight (pounds)
Heater 13.5 13.5
Shipping 17 18
When gas pressure is too low
• pilot will not stay lit
• burner will have delayed ignition
• heater will not produce specified heat
When gas quality is bad
• pilot will not stay lit
• burner will produce flames and soot
• heater will backfire when lit
Youmayfeelyourgaspressureistoolowor
gas quality is bad. If so, contact your local
natural gas supplier.
SERVICE HINTS
SPECIFICATIONS
MANUAL SHUTOFF
VALVE - GA5010
Manual shutoff valve with
1/8" NPT tap.
SERVICE
PUBLICATIONS
Youcanpurchaseaservicemanualfromthe
address listed on the back page of this
manual. Send a check for $5.00 payable to
DESA International.
ACCESSORY
Purchase this heater accessory from your
local dealer. If they cannot supply this ac-
cessory, either contact your nearest Parts
Central (page 18) or call DESA
International’s Parts Department at 1-800-
972-7879 for referral information. You can
also write to the address listed on the back
page of this manual.
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 cannot sup-
plyoriginal replacement part(s), call DESA
International’s Technical Service Depart-
ment at 1-800-323-5190 for referral infor-
mation.
When contacting your dealer or DESA In-
ternational, have ready:
• your name
• your address
• model number of your heater
• how heater was malfunctioning
• typeof gas used (propane/LPor natu-
ral gas)
• purchase date
Usually,wewillaskyoutoreturnthedefec-
tive part to the factory.
Parts Not Under Warranty
Contact authorized dealers of this product.
If they cannot supply original replacement
part(s), either contact your nearest Parts
Central (see page 18) or call DESA
International’s Parts Department at 1-800-
972-7879 for referral information.
When calling DESA International, have
ready:
• model number of your heater
• the replacement part number
REPLACEMENT
PARTS

16
101870
NATURAL GAS HEATER
CGN10A AND CGN6
12-2
12-1
ODS/PILOT
HEATER EXPLODED VIEW
10
12
11
1
2
3
4
5
6
79
8
10
13 14
15
16
17
18
21
23 24
27
22
26
25
19
20
28
29
ILLUSTRATED
PARTS LIST

17
101870
OWNER’S MANUAL
PARTS LIST This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 15 of this manual.
PART NUMBER FOR
CGN6 CGN10A
KEY
NO. DESCRIPTION QTY.
1 098304-01 098304-01 Screw, #10 x 3/8" 2
2 099467-02 099467-02 Front Panel Assembly 1
3 099318-04 099318-04 Grill Guard 1
4 101108-01 101108-01 Grill Guard Clip 2
5 102018-01AA 102018-01AA Bottom Glass Retainer 1
6 098260-03 098260-03 Glass Panel 1
7 098532-03AA 098532-03AA Top Glass Retainer 1
8 M11084-38 M11084-38 Screw, #8 x 3/8" 8
9 098352-03BR 098352-03BR Deflector Unit 1
10 098271-03 098271-03 Ignitor Cable 1
11 098249-01 098249-01 Nut, M5 2
12 100701-03 100701-03 ODS/Pilot Assembly 1
12-1 098514-01 098514-01 Thermocouple 1
12-2 098594-01 098594-01 Ignitor Electrode 1
13 099386-02 099386-02 Burner 1
14 099387-05 099387-05 Pilot Tubing 1
15 098251-01 098251-03 Injector 1
16 099463-01 099463-01 Injector Holder 1
17 099415-01 099415-01 Pressure Regulator 1
18 099462-01 099462-01 Burner Tubing 1
19 099391-02 099391-02 Regulator Tubing 1
20 098276-01 098276-01 1/8" NPT Plug 1
21 099057-01 099057-01 Pressure Tap Fitting 1
22 099413-01 099413-01 Control Valve 1
23 099468-12 099468-11 Cabinet 1
24 102445-01 102445-01 Piezo Ignitor 1
25 099393-01 099393-01 Control Knob 1
26 098508-01 098508-01 Valve Retainer Nut 1
27 098303-02 098303-02 Screw, #6 x 5/16" 2
28 099553-01 099553-01 Pilot Shield 1
29 099818-01 099818-01 Internal Tooth Washer 1
PARTS AVAILABLE - NOT SHOWN
099395-10 099395-03 Control Position Label 1
100642-02 100642-02 Assembly, Hardware 1

18
101870
NATURAL GAS HEATER
CGN10A AND CGN6
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.
Baltimore Electric
1348 Dixwell Avenue
Hamden, CT 06514
1-800-397-7553
203-248-7553
Parts Department
Portable Heater Parts
342N. County Rd. 400 East
Valparaiso, IN 46383
All States
219-462-7441
1-800-362-6951
FBD
P.O. Box 1096
1720 Kummer Road
Franklin, KY 42134
502-586-1922
1-800-654-8534
Four Flags Power
Products
1115 Stateline Road
Niles, MI 49120
616-684-2697
1-800-268-4983
Parts Only
Dayton Hardware
P.O. Box 275
North Dayton Station
Dayton, OH 45404
All States
513-258-3721
OH 1-800-762-3426
Halco Enterprises
208 Carter Drive, Unit 21
West Chester, PA 19382
215-696-2670
1-800-368-0803
LAPorte’sParts&Service
2444 North 5th Street
Hartsville, SC 29550
803-332-0191
Parts Department
Cans Unlimited, Inc.
P.O. Box 645
Taylor, SC 29687
All States
803-879-3009
1-800-845-5301
Master Service Center
1184 Wilson NW
Walker, MI 49504
616-791-4760
1-800-446-1446
Washer Equipment Co.
1715 Main Street
Kansas City, MO 64108
KS, MO, AR
816-842-3911
East Coast Energy
Products
707 Broadway
W. Long Branch, NJ
07764
908-870-8809
1-800-755-8809
Tarantin Tank Co.
P.O. Box 6129
Freehold, NJ 07728
908-780-9340
1-800-922-0724

19
101870
OWNER’S MANUAL
NOTES
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_______________________________________________________________________________________________

Model
Serial No.
Date Purchased
Always specify model and serial numbers when communicating with the factory.
We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our
standard written warranty. We make no other warranty, expressed or implied.
LIMITED WARRANTY
COMFORT GLOW VENT-FREE RESIDENTIAL GAS HEATERS
DESAInternationalwarrantsthisproducttobefreefromdefectsinmaterialsandcomponentsfortwo(2)yearsfrom
the date of first purchase, provided that the product has been properly installed, operated and maintained in
accordancewith all applicable instructions. To make aclaimunderthiswarrantytheBillof Sale or cancelled check
must be presented.
Thiswarrantyisextendedonlytotheoriginalretailpurchaser.Thiswarrantycoversonlythecostofpart(s)required
torestore thisheatertoproperoperating condition. Warrantypart(s)MUSTbe obtained throughauthorizeddealers
of this product and/or DESA International who will provide original factory replacement parts. Failure to use
original factory replacement parts voids this warranty. The heater MUST be installed by a qualified installer in
accordance with all local codes and instructions furnished with the unit.
This warranty does not apply to parts that are not in original condition because of normal wear and tear, or parts
that fail or become damaged as a result of misuse, accidents, lack of proper maintenance or defects caused by
improper installation. Travel, diagnostic cost, labor, transportation and any and all such other costs related to
repairing a defective heater will be the responsibility of the owner.
TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE SALE
OF THE PRODUCT; THIS EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EXPRESSED
WARRANTIESANDLIMITSTHEDURATIONOFANYANDALLIMPLIEDWARRANTIES,INCLUDING
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE TO TWO (2)
YEARS FROM THE DATE OF FIRST PURCHASE; AND DESA INTERNATIONAL’S LIABILITY IS
HEREBY LIMITED TO THE PURCHASE PRICE OF THE PRODUCT AND DESA INTERNATIONAL
SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING INDIRECT,
INCIDENTAL OR CONSEQUENTIAL DAMAGES.
Somestatesdonotallowalimitationonhowlonganimpliedwarrantylastsoranexclusionorlimitationofincidental
orconsequentialdamages,sotheabovelimitationonimpliedwarranties,orexclusionorlimitationondamagesmay
not apply to you.
This warranty gives you specific legal rights, and you may also have other rights that vary from state to state.
For information about this warranty write:
WARRANTY INFORMATION
KEEP THIS WARRANTY
2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
101870-01
REV. F
7/97