Comfort Glow CGN20TB Quick start guide

®
BLUE FLAME VENT-FREE NATURAL GAS HEATER
OWNER'S OPERATION AND INSTALLATION MANUAL
CGN20TB
CGN20TLB
CGN30TB
CGN30TLB
i
i
/
/
Heater Sizes: 20,000 Btu/Hr Thermostat and
30,000 Btu/Hr Thermostat Model Heaters
WARNING: If the information in this manual is not I
followed exactly, a fire or explosion may result ]
causing property damage, personal injury, or loss
Lof ife.
mDo not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
mWHAT 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: Improper instal-
lation, adjustment, alter-
ation, service, or mainte-
nance can cause injury or
property damage. Refer to
this manual for correct in-
stallation and operational
procedures. For assistance
or additional information
consult 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 pro-
vided. Refer to page 4 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, notforpurposeofresale,fromthemanufacturer
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.

BLUE FLAME NATURAL GAS HEATER
SAFETY
INFORMATION
A WARNINGS
IMPORTANT: Read this owner's
manual carefully and completely
before trying to assemble, oper-
ate, or service thls heater. Im-
proper use of this heater can
cause serlous Injuryor death from
bums, fire, explosion, elec_rlcal
shock, and carbon monoxlde
polsonlng.
_lb DANGER: Carbon monoxidepoisoning may lead to death!
Carbon Monoxide Poisoning: Early
signsof carbon monoxidepoisoning m-
=semblethe flu, with headaches,dizziness,
ornausea. Ifyou have thesesigns, theheater
may notbe working properly. Get fresh air
at once! Have beater serviced. Some people
aremore affected by carbonmonoxide than
others. These include pregnant women,
people with heart orlung disease oranemia,
those under the influence of alcohol, and
those at high altitudes.
Natural Gas: Natural gas is odorless. An
odor-making agent is added to naturalgas.
The odor helps you detect anaturalgasleak.
However, the odor addedto naturalgascan
fade.Naturalgasmaybepresenteventhough
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 tothis
heater or its controls can be dan-
gerous.
I,
2.
.
4.
5,
6.
This appliance is only for use with the 10.
typeof gasindicatedonthe ratingplate.
This applianceis notconvertible foruse
with othergases.
If you smell gas
• shut off gas supply
• do not try to light any appliance 11.
• do not touchany alectrical switch;do
not use any phone in your building
•immediately call your gas supplier 12.
from aneighbor's phone.Follow the
gas supplier's instructions 13.
• if you cannotreachyour gassupplier,
call the fu'e department
This heater shall not be installed in
abedroom or bathroom.
Never install the heater
• in a recreational vehicle
• where curtains, furniture, clothing, or
other flammable 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
This heater needs fresh, outside air
ventilation to run properly. This heater
has an oxygen depletion sensor (ODS)
pilot light safety system. The ODS shuts
down the heater if not enough fresh air
is available. See Fresh Air for Combus-
tion and Ventilatio_ pages 4 through 6.
Keep air openings in front and bottom
of heater clear and free of debris. This
will ensure enough air for proper com-
bustion.
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 beater
• where flammable liquids or vapors
are used or stored
• under dusty conditions
9. Never place any objects on the heater.
14.
15.
Surface of heater becomes very hot
when running heater. Keep children and
adults away from hot surface to avoid
burns or clothing ignition. Heater will
remain hot for a time after shut-down.
Allow surface to cool before touching.
Carefully supervise young children
when they are in the same room with
heater.
Make sure grill guard is in place be-
fore running heater.
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.
Turn off and unplug heater and let cool
before servicing. Only aqualified ser-
vice person should service and repair
heater.
Operating heater above elevations of
4,500 feet could cause pilot outage.
2 1o4&_ 7

OWNER'S MANUAL
PRODUCT
IDENTIFICATION
Panel
IgnitorButton ControlKnob
Guard
Glass
Panel
Cabinet
PRODUCT
FEATURES
Safety Device
This heater has a pilot with an Oxygen
Depletion Sensor Shutoff System (ODS).
The OI)S/pilot is arequiredfeaturefarvent-
free room heaters. The ODS/pilot shuts off
the heaterif there is not enough freshair.
Plezo Ignition System
This heaterhas apiezo igniWr.This system
requires no nlatehes, batteries, or other
sources to light heater.
Thermostatic Heat Control
Thermostatmodelshaveathermostatsens-
ingbulband acontrol valve. This resultsin
the greatest heater comfort. This can also
resultin lower gas bills.
Figure 1 -Vent-Free Natural Gas Heater (30,000 Btu/Hr Model Shown)
LOCAL CODES UNPACKING
Install and use heater with care. Follow all 1.
local codes. In the absence ofloeal codes, use 2.
the latest edition of the National Fuel Gas
CodeANSIZ223.1,aisoknownasNFPA54*. 3.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymareh Park
Quincy, MA 02269
Remove heater from carton.
Remove all protective packaging ap-
pliedto heater for shipment.
Check heater for any shipping damage.
If heater is damaged, promptly inform
dealer where you bought heater.
104331 3

BLUE FLAME NATURAL GAS HEATER
FRESH AIR FOR
COMBUSTION AND
VENTILATION
_WARNING: This heater shall
not be installed in a Confined
space unless provisions are pro-
vided for adequate combustion
and ventilation air. Read the fol-
lowing instructions to Insure
proper fresh air for this and other
fuel-burning appliances In your
home.
Today's homes are built more energy effi-
cient than ever. New materials, increased
insulation, and new construction methods
help reduce beat loss in homes. Home owners
weather strip and caulk around windows and
doors tokeep the cold air outand the warm air
in. During heating months, home owners
want their homes as airtight as possible.
While it is good to make your home energy
efficient, your home needs to breathe. Fresh
air must enter your home. All fuel-burning
appliances need fresh air for proper com-
bustion and ventilation.
Exhaust fans, fireplaces, clothes dryers, 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
The following is exerpts from National Fuel
Gas Code. NFPA 54/ANSI Z223.1, Section
5.3, Air for Combustion and Ventilation.
All spaces inhomes fallinto one ofthe three
following ventilation classifications:
1. Unusually Tight Contruction
2. Unconfined Space
3. Confined Space
The information on pages 4through 6will
help you classify your space and provide
adequate ventilation.
Unusually Tlght Construction
The air that leaks around doors and win-
dows may provide enough fresh air for
combustion and ventilation. However. in
buildings of unusually tight construction.
you must provide additional fresh air.
Unusually tight construction is de-
fined as construction where:
a. walls and ceilings exposed to the
outside atmosphere have a con-
tinuous water vapor retarder with
a rating of one perm (6 x 10"11kg
per pe.seo.n_) or less with open-
ings gasketed or sealedand
b. weather stripping has been
added on openable windows and
doors and
c. caulking or sealants are applied
to areas such as joints around
window and door frames, be-
twsen sole plates and floors, be-
tween wall-ceiling joints, be-
tween wall panels, at penetra-
tions 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 6.
If your home does not meet all of the
three criteria above, proceed to De-
termining Fresh-Air Flow For Heater
Location, page 5.
Confined and Unconfined Sp_e
TheNationalFuelGasC-ode(ANSIZ223.1,
1992 Section 5.3) 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 a space whose volume
is not less than 50 cubic feel per 1,000 Btu
per hour (4.8 m3per kw) of the aggregate
input rating of all appliances installed inthat
space. Rooms communicating directly with
the space in which the appliances are in-
stalled*, through opemngs not furnished
with doors, are considered apart of the
unconfined space.
This heater shall not be installed in a con-
fined space or unusually tight construction
unless provisions are provided for adequate
combustion and ventilation air.
*Adjoining rooms are communicating only
ifthere aredoorless passageways orventila-
tion _511Sbetween them.
4Io433!

OWNER'S MANUAL
FRESH AIR FOR
COMBUSTION AND
VENTILATION
Continued
DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION
Determining if You Have a Confined or Unconfined Space
Use this worksbeet to determine if you have a confined orunconfined space.
S pace: Includes theroom inwhich you will installheater plus any adjoining rooms with doorless passageways or ventilation grilIsbetween
the rooms.
1. Determine the volume of the space ('lengthx width x height).
l..¢ngth x Width xHeight = eu. ft. (volume of space)
Example: Space size 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) =2560 eu. ft. (volt_ee of space)
If additional ventilation to adjoining room is supplied with grills oropenings, add the vohmm of these rooms to the total volume of
the space.
2. Divide the space volume by 50 cubic feet to determine the maximum Btu/Hrthe space can support.
(volume of space) + 50 cu. ft. =(Maximum Btu/Hr the space can support)
Example: 2560 cu. ft. (volume of space) +50 cu. ft. = 51.2 or 51,200 (maximum Btu/Hrthe spac_ can support)
3. Add the Btu/Hr of all fuel burning appliances in the space.
Vent-free heater Btu/Hr
Gas water heater* Btu/Hr Example:
Gas furnace Btu/Hr Gas water heater 40,000 Btu/Hr
Vented gas heater Btu/Hr Vent-free heater + 20,000 Btu/Hr
Gas fireplace logs Btu/l-Ir Total =60,000 Btu/I-lr
Other gas appliances* + Btu/Hr
Total =Btu/Hr
* Do not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and vents to the outdoors.
4. Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.
Btu/Hr (maximum the space can support)
Btu/l-Ir (actual amount of Btu/Hr used)
Example: 51,200 Btu/Hr (maximum the space can support)
60,000 Btu/Hr (actual amount of Btu/Hr used)
The space in the above example is a confined space because the actual Btu/Hr used is more than the maximum Btu/Hr the space can support.
You must provide additional fresh air. Your options are as follows:
A. Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoin-
ing room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 6.
B. Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 6.
C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconfined.
If the actual Btu/Hr used is less than the maximum Btu/I-Irthe space can support, the space is an unconfined space. You will need no
additional fresh air ventilation.
WARNING: Ifthe area in which the heater may be operated is smaller than that defined as an unconfined space,
provide adequate combustion and ventilation air by one ofthe methods described in the National FuelGas Code,
ANSI Z223.1, 1992, Section 5.3 or applicable local codes.
Continued
I04_I 5

BLUE FLAME NATURAL GAS HEATER
FRESH AIR FOR
COMBUSTION AND
VENTILATION
Continued
VENTILATION AIR
Ventilation Air From Inside
Building
This freshairwould come from anadjoining
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 onthe wall connecting the two spaces
(see options 1and 2, Figure2). You can also
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 Combastion and Ventilation for
required size of ventilation grills orducts.
,_ WARNING: Rework work-
sheet, adding the space of the
adjoining unconfined space. The
combined spaces must have
enough fresh air to supply all
appliances in both spaces.
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.
Connect these items directly to the outdoors
or spaces open to the outdoors. These spaces
include attics and crawl spaces.
IMPORTANT: Do not provideopenings for
inlet or outlet air into attic if attic has a
thermostat-controUed power vent. Heated air
entering the attic will activate the power vent.
Vent,atlon
Gdlls
intoAdjoining
Room,
Option
Ventilation Gdlls
Into/_olnlng Room,:
Option 2
Figure 2 -Ventilation Air from Inside Building
Outlet
Air
Inlel
Air
Inlet Air
To Attic
............... To
tHI6H....P
_] Crawl
Space
IIIIIIIIIIIIIIII
Ventilated
Crawl Space
Figure 3 -Ventilation Air from Outdoors
6104331

OWNER'S MANUAL
INSTALLATION
NOTICE: This heater is intended
for use as supplemental heat. Use
this heater along with your pri-
mary heating system. Do not in-
stall this heater as your primary
heat source. If you have a central
heating system, you may run
system's circulating blowerwhne
using heater. This will help circu-
late the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
NOTICE: A qualified service per-
son must install heater. Follow
all local codes.
CHECK GAS TYPE
Use only natural gas. If your gas supply is
not natural gas, do not install heater. Call
dealer where you bought heater for proper
type heater.
INSTALLATION ITEMS
Before installing heater, make sure you have
the items listed below.
•piping (check local cedes)
•sealant (resistant to propane/LP gas)
• manual shutoff valve *
• ground joint union
• test gauge connection * (see Figure 13,
page 10)
•sediment trap
• tee joint
• pipe wrench
•test gauge connection*
* An A.G.A. design-certified manual shutoff
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
Accessories, page 18.
LOCATING HEATER
This heater is designed tobe mounted on a
wall.
_k WARNING: Maintain the mini-
mum clearances shown In Figure
4.ffyou can, provide greater clear-
ances from floor, ceiling, and join-
ing wall.
You canlocate heateronfloor, away from a
wall. An optional floor mounting stand is
needed. Purchase the floor mounting stand
from your dealer. See Accessories, page 18.
WARNING: Never install the
heater
• in a bedroom or a bathroom
•in a recreational vehicle
• where curtains, furniture,
clothing, or other flammable
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 cre-
ates warm air currents. These
currents move heat to wall sur-
faces next to heater. Installing
heater next to vinyl or cloth wall
coverings or operating heater
where Impurities (such as to-
bacco smoke, aromatic candles,
cleaning fluids, oil or kerosene
lamps, etc.) In the air exist, may
discolor walls.
IMPORTANT: Vent-free heaters addmots-
tare to the air. Although this is beneficial,
installing heater in rooms without enough
ventilationairmay causemildew toform from
too much moisture. See Fresh Airfor Com-
bustion and Ventilation, pages 4 through6.
CAUTION: If you Install the
heater in a home garage
•heater pilot and burner must
be at least 18 inches above
floor
•Iocete heater where moving ve-
hicle will not hit it
Forconvenianceandefficiency, install heater
•where there is easy access foroperation,
inspection, and service
• in coldest part of room
An optional fan kit is available from your
dealer. See Accessories, page 18. If plan-
ning to use fan, locate heater near anelectri-
cal outlet.
Minimum
=" to Top
FLOOa Sudace
of Carpeting or
Other Combustible
Material
Figure4 -MountlngClearancesAsViewed
From Frontof Heater
Comin_d
104331 7

BLUE FLAME NATURAL GAS HEATER
INSTALLATION
Continued
THERMOSTAT SENSING
BULB
The thermostat sensing bulb has been
placed inside the heater for protection
during shipping.
Locating Thermostat Sensing
Bulb
1. Remove front panel of heater (see Fig-
ure 7).
2. Locate thermostat sensing bulb just
under burner assembly.
IMPORTANT: Attach thermostat sensing
bulb to back of heater for properoperation.
Attaching Thermostat Sensing
Bulb
1. Remove thermostat sensing bulb from
holders inside heater. Route through
slot opening in bottom of heater.
2. Place clamp on thermostat sensing bulb
as shown in Figure 5. Clamp is pro-
vided in hardware package.
3. Snap clamp into upper mounting hole
as shown in Figure 5. Mounting hole is
located on lower left edge on back of
heater. Make sure the thermostat sens-
is pointing up.
Thermostat
Figure 5- Attaching Thermostat Sensing
Bulb
INSTALUNG HEATER TO
WALL
Mounting Bracket
The mounting bracket is located on back
panel of heater. It has been taped there for
shipping. Remove mounting bracket from
back panel.
Figure 6 - Bracket Location
Removing Front Panel Of Heater
1. Remove two screws near bottom cor-
ners of front panel.
2. Lit_straightupon gfiUguard until itstops.
Grill guard will slideup about 1/4",
3. Pull bottom of front panel forward, then
downward.
4. Remove cardboard packing from grill
and glass.
Figure 7- Removing Front Panel Of Heater
Methods For Attaching
Mounting Bracket To Wall
Only use last hole on each end of mounting
bracket to attach bracket to wall. These two
holes are 16inches apart from their centers.
Attach mounting bracket to wall in one of
two ways.
1. Attaching to wall stud
2. Attaching to wall anchor
Attaching to wall stud:This method
provides the strongest hold. Insert mounting
screws through mounting bracket and into
wall studs.
Attaching to wall anchor: Thismethod
allows you to attach mounting bracket to
hollow walls (wall areas between studs) or
to solid walls (concrete or masonry).
Decide which method better suits your needs.
Either method will provide asecure hold for
the mounting brackeL
Marking Screw Locations
1. Tape mounting bracket to wall where
heater will be located. Make sure
mounting bracket is level.
_kWARNING: Maintain minimum
clearances shown in Figure 8. If
you can, provide greater clear-
ancas from floor and joining wall.
2. Mark screw locations on wall (see Fig-
ure 8).
Note: Only mark last hole on each end
of mounting bracket. Insert mounting
screws through these holes only.
3. Remove tape and mounting bracket
from wall.
\/I
Only Insert MoLmtlng 18 3/4"
Screws Through Last MI_.
Hole On Each End
30,000 Btu/HrModel
18 3/4"
Screws Through Last MIn.
20,000 Btu/Hr Models
Figure 8 - Mounting Bracket Clearances
8104331

OWNER'S :MANUAL
INSTALLATION
Continued
Attaching Mounting Bracket To
Wail
Note: Wall anchors, mounting screws, and
spacers arein hardwarepackage. The hard-
ware package is provided with heater.
Attaching to wall stud method
Forattachingmounting bracketto wall studs.
1. Drill holes at marked locations using
9/64" drill bit.
2.
3.
4.
Placemounting bracket onto wall. Line
uplast hole on each endof bracketwith
holes drilled in wall.
Insertmounting screws throughbracket
and into wall studs.
Tighten screws until mounting bracket
is fli'mly fastened to wall studs.
Attaching to wall anchor method
For attaching mounting bracket to hollow
walls (wall areas between studs) or solid
walls (concrete or masonry).
I. Drill holes at marked locations using
5/16" drill bit. For solid walls (concrete
or masonry), drill at least 1" deep.
2. Fold wall anchor as shown in Figure 9.
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.
IMPORTANT." Do not hammer key!
For thick walls (over 1/2" thick) or solid
walls, do not pop open wings.
5. Place mounting bracket onto wall. Line
up last hole on each end of bracket with
wall anchors.
6. Insert mounting screws through bracket
and into wall anchors.
7. Tighten screws until mounting bracket
is firmly fastened to wall.
Figure 9 -Folding Anchor
Figure 10 -Popping Open Anchor Wings
For Thin Walls
Placing Heater On Mounting
Bracket
1. Locate two horizontal slots on back
panel of heater.
2. Place heater onto mounting bracket.
Slide horizontal slots onto stand-out
tabs on mounting bracket.
Stand-Out Tab _
Mounting Bracket
(attached to wail)
Figure 11 -Mounting Heater Onto
Mounting Bracket
Installing Bottom Mounting
Screws
1. Locate two bottom mounting holes.
These holes are near bottom on back
panel of heater (see Figure 12).
2. Mark screw locations on wall.
3. Remove heater from mounting bracket.
4. If installing bottom mounting screws
into hollow or solid wall, install wall
anchors. Follow steps 1 through 4 un-
der Attaching To Wall Anchor Method.
If installing bottom mounting screw
into wal! stud, drill holes at marked lo-
cations using 9/64" drill bit.
5. Replace heater onto mounting bracket.
6. Place spacers between bottom mount-
ing holes and wall anchor or drilled hole.
7.
8.
Hold spacer in place with one hand.
With other hand, insert mounting screw
through bottom mounting hole and
spacer. Place tip of screw in opening
of wall anchoror drilled bole.
Tighten both screws until heater is
firmly secured to wall. Do not over
tighten.
Nolo: Donot replace front panel at this
time. Replace front panel aftermaking
gas connections and checking forleaks
(seepages 10and ll). Make gasconnec-
tions and check for leaks before replac-
ing frontpanel(see pages 10 and11).
Figure 12 - Installing Bottom Mounting
Screws
104337 9

BLUE FLAME INATURAL GAS HEATER
INSTALLATION
Continued
CONNECTING TO GAS
SUPPLY
NOTICE: A qualified service per-
son must connect heater to gas
supply. Follow all local codes.
WARNING: Never connect
heater to private (non-utility) gas
wells. This gas is commonly
known as well-head gas.
IMPORTANT: Check gas line pressure
before connecting heater to gas line. Gas
line pressure must be no greater than 14
inches of water. If gasline pressureishigher.
heater regulator damage could occur.
Apply pipe joint sealant lightly to male
threads. This will prevent excess sealant
from going in_ pipe. Excess sealant inpipe
could result in clogged heater valves.
_CAUTION: Useplpejoint seal-
ant that Is resistant to liquid pe-
troleum (LP) gas.
Installsediment trapin supplyline asshown
in Figure 13. Locate sediment hap where it
is within reach for cleaning. Locate b_di-
ment trapwhere trappedmatte_is 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 oris installed wrong, heater
may not runproperly.
IMPORTANT: Hold pressure regulator
with wrench when connecting it to gas pip-
ing and/orfittings.
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
your local codes. Usepipe of large
enough diameter to allow proper
gas volume to heater. If pipe is
too small, undue loss of pres-
sure will occur.
Typical Inlet Pipe Diameters
20,000 Btu/HrModels 3/8" or greater
30,000 Btu/Hr Models 1/2" or greater
Installation must include a manual shutoff
valve, union, and plugged 1/8" NPT tap.
Locate NPT tap within reach for test gauge
hook up. NPT tap must be upstream from
heater (see Figure 13).
Pressure
Regulator
3/8" NPT
Heater
Cabinet
rTeeJoint ,,_'_ \\ L Manual
/ \ Sh.to.
Test /Reducer _ _ _ Valve *
Gau e _Bushingto
con ooion1/8".ST I T ,°lInle,
[1/8"NPT/ _ J _/PipefromGas
L_ PlugTap _ j,,,,,,,.---,_,=r Meter(5"W.C.
_to 10.5"W.C.
Sediment r. TeeJoint_Pressure)
Trap _ Pipe Nipple LIa,, imum
Lcap _]'_---_----
Figure 13-Gas Connection
• An A.G.A. design-certified manual shutoff valve with 1/8" NI_ tap is an acceptable
alternative to test gauge connection. Purchase the optional A.G.A. design-certified manual
shuU3ffvalve from your dealer. See Accessories, page 18.
t0 I0433_

OWNER'S MANUAL
INSTALLATION
Continued
CHECKING GAS
CONNECTIONS
WARNING: Test all gas pip-
Ing and connections for leaks
after Installatlon or servicing.
Correct all leaks at once.
_WARNING: Never usean open
flame to check for a leak. Apply a
mlxture 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,
2.
3.
Disconnect heater and its individual
manual shutoff valve from gas supply
piping system. Pressures in excess of
1/2 psig will damage heater regulator.
Cap off open end of gas pipe where
manual shutoff valve was connected.
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
2.
3.
Close manual shutoff valve (see Fig-
ure 14).
Pressurize supply piping system by ei-
ther using compressed air or opening
main gas valve located on or near gas
meter.
Check all joints from gas meter to
manual shutoff valve (see Figure 15).
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
5.
6.
1, Open manual shutoff valve (see Fig-
ure 14).
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 thermostat gas valve (see Fig-
ure 15). Apply mixture of liquid soap
and water to gas joints. Bubbles form-
ing show a leak.
Correct all leaks at once. A.
Light heater (see Operating Heater).
Check the rest of the internal joints for
leaks. B.
7. Turn off heater (see To Turn Off Gas to
Appliance, page 12).
8. Replace front panel.
r_[_-_OP on
Manual J II t
Shutoff //F_ _ \
Valve __?__ ,
_J Closed
Figure 14 -Manual Shutoff Valve
Thermostat Gas Valve
OPERATING
HEATER
I FOR YOUR SAFETY I
READ BEFORE
LIGHTING
WARNING: If you do not fol-
low these Instructions exactly, a
fire or explosion may result caus-
Ing property damage, personal
injury or loss of life.
C.
D.
This appliance has a pilot which must
be lighted by hand When lighting the
pilot, follow these instructions exactly.
BEFORE LIGHTING smell all
around the appliance area for ga_ Be
sure to smell next to the floor because
some gas is heavier than air and will
settle on the floor.
WHAT TO DO IF YOU SMELL
GAS
• Do not try to light any appliance.
• Do not touch any dectric switch; do
not use any phone in your buildinl_
•Immediately call your gas supplier
from a neighbor's phone. Follow
the gas supplier's instructions.
•If you cannot reach your gas sup-
plier, call the fire department.
Use only your hand to push in or turn
the gas control knob. Never use tools.
If the knob will not push in or turn
by hand, don't try to repair it, call u
qualified service technician or gas
supplier. Force or attempted repair
may result in a fire or explosion.
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.
Continued
i_331 11

BLUE FLAME NATURAL GAS HEATER
OPERATING
HEATER
LIGHTING
INSTRUCTIONS /
1. STOP! Read the safety information,
page 11, column 3.
2. Make sure manual shutoff valve is
fully open.
3. Turn control knob clockwise
to the OFF position.
4. Wait five (5) minutes to dear out any
gas. Then smell for gas, including
near the floor. If you smell gas,
STOP! Follow "B" in the safety in-
formation, page 11, column 3. If you
don't smell gas, go to the next step.
5. Turn control knob counterclockwise
to the PILOT position.
Press in control knob for five (5) sec-
ands (see Figure 16).
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
down and release ignitor button. 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
to Troubleshooting, pages 14 through
16. Also contact a qualified service
person or gas supplier for repairs.
Until repairs are made, 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.
Note: If pilot goes out, repeat steps
3through 7. This heater has a safety
interlock system. Wait one (1) minute
before lighting pilot again.
8. Turn control knob counterclockwise
to desired heating level. The
main burner should light. Set control
knob to any heat level between HI
and LO.
I _k CAUTION: Do not try to ad-
just heating levels by using the
manual shutoff valve.
Ignitor Button ControlKnob
Figure 16 - Control Knob In The OFF
Position
Therm°c°_Pl_//_ Or Elo_irl°_Bumer
Figure 17- Pilot
TOTURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. Turn control knob clockwise
to the OFF position.
2. Turn off all electric power to the ap-
pliance if service is to be performed.
Shutting Off Burner Only (pilot
stays lit)
Turn control knob clockwise _to
the PILOT position.
I THERMOSTAT 1
CONTROL OPERATION
The thermostatic control used on these
models differs from standard thermo-
stats. Standard thermostats simply turn
on and off the burner. The thermostat
used on this heater senses the room tern-
perature. 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, the burner will
shut off. The burner will cycle back on
when room temperature drops below the
set temperature. The control knob can be
set to any heat level between HI and LO.
Note: The thermostat sensing bulb mea-
sures the temperature of air near the
heater cabinet. This may not always agree
with room temperature (depending on
housing construction, installation loca-
tion, room size, open air temperatures,
etc.). Frequent use of your heater will let
you determine your own comfort levels.
I MANUAL LIGHTING I
PROCEDURE
1. Remove front panel (see Figure 7,
page 8).
2. Follow steps 1through 5under Light-
ing Instructions.
With control knob pressed in, strike
match. Hold match to pilot until pi-
lot lights.
4. Keep control knob pressed in for 30
seconds after lighting pilot. After 30
seconds, release control knob.
5. Replace front panel.
12 104331

OWNER'S MANUAL
INSPECTING
BURNER
Check pilot flame patternand burner flame
patternoften.
PILOT FLAME PATTERN
Figure 18 shows a correct pilot flame pat-
urn. Figure 19 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.
If pilot flame pattern is incorrect, as shown
in Figure 19.
•turn heater off (see To Turn OffGas to
Appliance, page 12).
• seeTroubleshooting, pagesl4throughl6.
Pilot Burner
Figure 18- Correct Pilot Flame Pattern
Thermocouple Pilot Burner
Figure 19 - Incorrect Pilot Flame Pattern
BURNER FLAME PATrERN
Figure 20 shows a correct burner flame
pattern. Figure 21 shows 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 pro-
duce increased levels of carbon
monoxide. If burner flame pat-
tern shows yellow tipping, follow
instructions at bottom of this
page.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles enter the
heater and burn causing brief
patches of orange flame.
If burner flame pattern is incorrect, asshown
in Figure 21
• turn heater off(see To Turn OffGas to
Appliance, page 12).
•seeTroubleshooting, pages 14through 16.
CLEANING AND
MAINTENANCE
•1=WARNING: Tum 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
heater inspected yearly by aqualb
fled service person.Heater may
need more frequent cleaning due
to excessive lint from carpeting,
bedding material, etc.
ODS/PILOT AND BURNER
•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.
CORRECT FLAME PATTERN
AT HIGH POSITION
Exterior
•Use asoft cloth dampened with a mild
_,,.=,,_ soap and water mixture. Wipe the cabi-
net to remove dust.
Figure 20- Correct Burner Flame Pattern
Yellow
INCORRECT FLAME PAI"rERN
AT HIGH POSmON
Figure 21 -Incorrect Burner Flame Pattern
lo,_331 13

BLUE FLAME NATURAL GAS HEATER
TROUBLESHOOTING
Noto:AIl troubleshooting itemsarelisted in
order of operation.
_, WARNING: Turn off and un-
plug heater and let cool before
serv|clng. Only a qualified ser-
vice person should servlca and
repair heater.
ACAUTION: Never use s wire, I
needle, or similar object to clean I
ODS/pllot.This can damage ODS/
pilot unit.
OBSERVED PROBLEM POSSIBLE CAUSE REMEDY
When ignitor button is pressed, there is no
spark at ODS/pilot 1. Ignitorelectrode positioned wrong
2. Ignitorelectrode 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. Replace ignitor
2. Replace ignitor
3. Reconnect ignitor cable
4. Free ignitor cable if pinched by any
metal ortubing. 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
When ignitor button is pressed, there is
spark at ODS/pilot but no ignition 1. Gas supply turned offor manual 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. ODS/pilot is clogged
6. Gas regulator setting is not correct
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
removed
5. Clean ODS/pilot (see Cleaning and
Maintenance, page 13) or replace ODS/
pilot assembly
6. Replace gas regulator
ODS/pilot lights but flame goes out when
control knob is released 1. Control knob not fully pressed in
2. Control knob not pressed in long enough
3. Safety interlock system has been trig-
gered Cl'hermostat models only)
4. Manual shutoff valve not fully open
5. Thermocouple connection loose at con-
trol valve
6. Pilot flame not touching thermocouple,
which allows thermocouple to cool,
causing pilot flame to go out. This prob-
lem could he caused by one or both of
the following:
A) Low gas pressure
B) Dirty or partially clogged ODS/pilot
7. Thermocouple damaged
8. Control valve damaged
1. Press in control knob fully
2. After ODS/pilot lights, keep control
knob pressed in 30 seconds
3. Wait one (1) minute for safety interlock
system toreset. Repeat ignition operation
4. Fully open manual shut-offvalve
5. Hand tighten until snug, then tighten 1/4
turn more
6. A) Contact local natural gas company
B) Clean ODS/pilot (see Cleaning and
Maintenance, page 13) or replace ODS/
pilot assembly
7. Replace thermocouple
8. Replace control valve
14 to_331

OWNER'S MANUAL
TROUBLESHOOTING
Continued
OBSERVED PROBLEM POSSIBLE CAUSE REMEDY
Burner does not light after ODS/pilot is lit I. Burner orifice is clogged 1. Clean burner (see Cleaning and Mainte-
nance, page 13) or replace burner orifice
2. Burner orifice diameter is too small 2. Replacebumerorifiee
3. Inlet gas pressure is too low 3. Contact local natural gas company
Delayed ignition of burner 1. Manifold pressure is too low 1. Contact local natural gas company
2. Burner orifice is clogged 2. Clean burner(see Cleaning and Mainte-
nance, page 13) or replace burner orifice
Burner backfiring during combustion 1. Burner orifice is clogged or damaged 1. Clean burner (see Cleaning and Mainte-
nance, page 13)or replace burner orifice
2. Burner damaged 2. Replace burner
3. Gas regulator defective 3. Replace gas regulator
Yellow flame during burner combustion 1. Not enough air 1. Check burner for dirt and debris. If
found, clean burner (see Cleaning and
Maintenance, page 13)
2. Gas regulator defective 2. Replace gas regulator
Slighismokeorodorduringinitialoperation 1. Residues frommanufacturing processes 1. Problem will stop after a few hours of
operation
Heater produces a whistling noise when 1. Turning control knob to HI position 1. Turn control knob to LO position and
burner is lit when burner is cold let warm up for a minute
2. Air in gas line 2. Operate burner until air is removed from
line. Have gas line checked by local
natural gas company
3. Observe minimum installation clear-
ances (see Figure 4, page 7)
4. Clean burner(see Cleaning andMainte-
nance, page 13)or replace burner orifice
3. Air passageways on heater blocked
4. Dirty or partially clogged burner orifice
Io433T 15
Continued

BLUE FLAME NATURAL GAS HEATER
TROUBLESHOOTING
Continued
AWARNING: 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. Fonowthe
gas suppller's instructions.
•If you cannot reach your gas supplier, call the fire department.
IMPORTANT: Operatingheaterwhereimpurities in air existmaycreateodors.Cleaning
supplies,paint,paintremover,cigarettesmoke,cementsandglues,newcarpetortextiles,
etc., create fumes. These fumes may mix with combustion airand create odors.
OBSERVED PROBLEM POSSIBLE CAUSE REMEDY
Heater produces aclicking/ticking noise 1. Metal expanding while heating or con- 1. This is common with most heaters. If
just afterburner is lit or shutoff tracting while cooling noise is excessive, contact qualified ser-
vice person
Heater produces unwanted odors 1. Heater burning vapors from paint, hair |. Ventilate room. Stop using odor causing
spray, glues, etc. (see IMPORTANT products while heater is running
statement above)
2. Gas leak. See Warningstatement at 2. Locate and correct all leaks (see Check-
top of page ingGasConnections,page11)
Heatershutsoffinuse(ODSoperates) 1. Not enough fresh air is available 1. Open window and/or door for ventilation
2. Low line pressure 2. Contact local propaneJLP gas company
3. ODS/pilot is partially clogged 3. Clean ODS/pilot (see Cleaning and
Maintenance, page 13)
Gas odor even when control knob is in OFF 1. Gas leak. See Warning statement at 1. Locate and correct all leaks (see Check-
position top of page ing Gas Connections, page 11)
2. Control valve defective 2. Replace control valve
Gas odor during combustion 1. Foreign matter between control valve 1. Take apart gas tubing and remove for-
and burner eign matter
2. Gasleak.SeeWerningstatementat 2. Locate and correct all leaks (see Check-
top of page ing Gas Connections, page 11)
Moisture/condensation noticed onwindows 1. Not enough combustion/ventilation air 1. Refer to Air for Combustion and Venti-
lation requirements (page 4)

OWNER'S MANUAL
SPECIFICATIONS
Btu (Variable)
Type Gas
Ignition
Pressure Regulator Setting
CGN20TB/CGN20TLB
20,000 Btu/Hr Models
10,000/20,000
Natural Only
Piezo
3"W.C.
Inlet Gas Pressure (in. of water)
Maximum 10.5"
Minimum 5"
Dimensions, Inches (H xWxD)
Heater 23.5 x 18.5 x8.0
Carton 25.8 x21.3 x I0.I
Weight (pounds)
Heater 22
Shipping 27
CGN30TB/CGN30TLB
30,000 Btu/Hr Models
15,000/30,000
Natural Only
Piezo
3" W.C.
10.5"
5"
23.5x25.9x8.0-
25.8x28.7x10.1
30
35
TECHNICAL
SERVICE
You may have further questions about in-
stallation, operation, or troubleshooting.
If so, contact DESA International's Techni-
cal Service Department at 1-800-323-5190.
SERVICE
PUBLICATIONS
You can purchase a service manual from the
address listed onthe back page ofthismanual.
Send a check for $5.00 payable to DESA
International.
SERVICE HINTS
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
You may feel your gas pressure is too low or
gas quality is bad. If so, contact your local
natural gas supplier.
REPLACEMENT
PARTS
Note:Use only original replacement parts.
This will protect your warranty coverage
for partsreplaced under warranty.
Parts Under Warranty
Contactauthorizeddealers ofthis product If
theycan'tsupplyoriginal replacement part(s),
eithercontactyournearestPartsCentral (page
19) or call DESA International's Technical
Service Department at 1-800-323-5190 for
.... re_ferral_inform_ation.......
When calling DESA International, have
ready
your nalne
your address
model numberof your heater
how heater was malfunctioning
typeofgas used(lxopa_/LP ornaturalgas)
purchase date
Usually, we will ask you to return the defec-
tive part to the factory.
Parts Not Under Warranty
Contact authorized dealers of this product.
If they can't supply original replacement
part(s), either contact your nearest Parts
Central (page 19) 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
Io4331 17

BLUE FLAME NATURAL GAS HEATER
ACCESSORIES
Purchase these heateraccessories fromyour
local dealer. If they can not supply these
accessories, eithercontact yournearest Parts
Central (see page 19) or call DESA
International's Parts Department at 1-800-
972-7879 for referralinformation. You can
also write to the address listed on the back
page of this manual.
FAN KITS - GA3100A AND
GA3200TA
For all models. Provides batter heat distri-
bution. Makes heater more efficient. Coln-
plete installation and operating instructions
included.
Manuallycontrolled-GA3100A. Includes
ONIOFF switch.
Thermostatically controlled - GA3200TA.
Includes three settings: ON/OFF/AUTO.
FLOOR MOUNTING STAND
20,000 Btu/Hr Models
CGN20TLB - GA4500L - Ivory
CGN20TB - GA4500 -
Champagne
30,000 Btu/l-lr Models
CGN30TLB - GA4510L - Ivory
CGN30TB - GA4510 -
Champagne
For locating heater on the floor, away from
a wall. Complete installation instructions
included.
MANUAL SHUTOFF VALVE -
GA5010
For all models. Manual shutoff valve with
1/8" NFI" tap.
18 _o,_

OWNER'S MANUAL
PARTS CENTRALS
Baltimore Electric
1348 Dixwell Avenue
Hamden, CT 06514
1-800-397-7553
203-248-7553
PartsDepartment
Portable Heater Parts
342 N. CountyRd. 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
These PartsCentrals are privately owned businesses. They have agreed to support Our
customer's needs by providing original replacement parts andaccessories. ':
Master Service Center
1184 Wilson NW
Walker, M149504
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
833 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
Albany Ladder
1586.90 Central Avenue
Albany, NY 12205
NY, MA, VT
518-869-5335
1-800-354-7368
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
WesI Chester, PA I93_2-
215-696-2670
1-800-368-0803
LA Porte's Parts & Service
2444 N. 5th Street
HartsviUe, 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
w4331 19

BLUE FLAME NATURAL GAS HEATER
ILLUSTRATED
PARTS
BREAKDOWN
CGN20TB
CGN20TLB
CGN30TB
CGN30TLB
2O
21
\
15
4\
J
7
20 _o4331