Desa Comfort Glow CGB3924NR Quick start guide

Save this manual for future reference.
WARNING: Improper installation, ad-
justment,alteration,service,ormainte-
nancecancauseinjuryorpropertydam-
age. Refer to this manual for correct
installationandoperationalprocedures.
For assistance or additional informa-
tion consult a qualified installer, ser-
vice agency, or the gas supplier.
WARNING:Thisapplianceisfor instal-
lation only in a solid-fuel burning ma-
sonry or UL127 factory-built fireplace,
orinanapprovedventlessfirebox.Itis
design certified for these installations
in accordance with ANSI Z21.11.2.
Exception: Do not install this appli-
ance in a factory-built fireplace that
includesinstructionsstatingithasnot
beentestedorshouldnotbeusedwith
unvented gas logs.
WARNING: This is an unvented gas-fired heater. It uses air (oxygen) from the room in
which it is installed. Provisions for adequate combustion and ventilation air must be
provided.Referto AirforCombustionandVentilation sectiononpage4ofthismanual.
®
PREMIUM AGED SPLIT OAK AND
YELLOW FLAME UNVENTED (VENT-FREE)
NATURAL GAS LOG HEATERS
CGD3924NR
CGB3924NR
CGB3930NR
24" and 30" Remote
Controlled Model
P
I
L
O
T
O
F
F
O
N
LO
REMOTE
OFF
HI
OWNER’S OPERATION AND INSTALLATION MANUAL
WARNING: If the information in this
manual is not followed exactly, a fire or
explosion may result causing property
damage, personal injury, or loss of life.
— Donotstoreorusegasolineorother
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.
• Immediatelycallyourgassupplierfrom
a neighbor’s phone. Follow the gas
supplier’s instructions.
• If you cannot reach your gas supplier,
call the fire department.
— Installationandservicemustbeper-
formed by a qualified installer, service
agency, or the gas supplier.
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.
Remote Control
Operation Requires
Two (2) 9-Volt Alkaline
Batteries Not Included
(Yellow Flame Model Shown)

2
104306
UVENTED NATURAL GAS LOG HEATER
CGD3924NR, CGB3924NR and CGB3930NR
SAFETY
INFORMATION
Carbon Monoxide Poisoning: Early
signs of carbon monoxide poisoning re-
semble the flu, with headaches, dizziness,
ornausea.Ifyouhavethesesigns,theheater
maynotbeworkingproperly.Getfreshair
atonce!Haveheaterserviced.Somepeople
are more affected by carbon monoxide than
others. These include pregnant women,
peoplewithheartorlung diseaseoranemia,
those under the influence of alcohol, and
those at high altitudes.
Natural Gas: Natural gas is odorless. An
odor-making agent is added to the gas. The
odor helps you detect a gas leak. However,
theodor addedtothe gascanfade. 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.
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, electrical
shock, and carbon monoxide
poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
WARNING: Any change to
this heater or its controls can be
dangerous.
1. This appliance is only for use with the
typeof gas indicatedonthe rating plate.
Thisappliance is notconvertiblefor use
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 building
• immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions
• ifyou cannot reachyour gas supplier,
call the fire department
3. This heater shall not be installed in a
bedroom or bathroom.
4. Never install the heater
• in a recreational vehicle
• wherecurtains, furniture, clothing,or
otherflammable objectsareless than
36inches fromthefront, top,orsides
of the heater
• in high traffic areas
• in windy or drafty areas
5. Before installing in a solid fuel burn-
ingfireplace, thechimneyflue and fire-
box must be cleaned of soot, creosote,
ashes and loose paint by a qualified
chimney cleaner. Creosote will ignite
if highly heated. Inspect chimney flue
for damage. If damaged, operate heater
with flue damper closed.
6. If fireplace has glass doors, never op-
eratethis heater with glassdoorsclosed.
Ifyou operateheaterwith doorsclosed,
heat buildup inside fireplace will cause
glass to burst. Also if fireplace open-
ing has vents at the bottom, you must
open the vents before operating heater.
7. You must operatethisheater with afire-
place screen in place. Make sure fire-
place screen is closed before running
heater.
8. This log heaterisdesignedto be smoke-
less. If logs ever appear to smoke, turn
off heater and call a qualified service
person. Note: During initial operation,
slight smoking may occur due to log
curing and heater burning manufactur-
ing residues.
9. Do not allow fans to blow directly into
the fireplace. Avoid any drafts that al-
ter burner flame patterns. Ceiling fans
maycreate drafts thatalterburner flame
patterns. Altered burner patterns can
cause sooting.
10. Before usingfurniturepolish, wax,car-
pet cleaner, or similar products, turn
heater off. If heated, the vapors from
these products may create a white resi-
due within burner box or on adjacent
walls or furniture.
11. Do not use a blower insert, heat ex-
changer insert or other accessory not
approved for use with this heater.
12. This heaterneedsfresh, outside airven-
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 Air for Combustion
and Ventilation, pages 4 through 6. If
heater keeps shutting off, see Trouble-
shooting, pages 18 through 20.
13. Do not run heater
• where flammable liquids or vapors
are used or stored
• under dusty conditions
14. Do not use this heater to cook food or
burn paper or other objects.
15. Never place any objects on the heater.
16. Heater baseassemblybecomesvery hot
whenrunning heater. Keepchildrenand
adults away from hot surface to avoid
burns or clothing ignition. Heater will
remain hot for a time after shutdown.
Allow surface to cool before touching.
17. Carefully supervise young children
when they are in the room with heater.
When using the hand-held remote ac-
cessory, keep remote selector switch in
the OFF position to prevent children
fromturning on burnerswith hand-held
remote control unit.
18. Do not use heater if any part has been
exposed to or under water. Immediately
call a qualified service technician to in-
spectthe room heaterandtoreplace any
part of the control system and any gas
control which has been under water.
19. Do not operate heater if any log is bro-
ken. Do not operate heater if a log is
chipped (dime-sized or larger).
20. Turn heater off and let cool before ser-
vicing,installing,orrepairing.Makesure
the remote selector switch is in the OFF
position. Only a qualified service person
should install, service, or repair heater.
21. Make sure the remote selector switch is
in the OFF position when you are away
from home for long periods of time.
22. This heater must not be connected to
any external electrical source.
23. Operating heater above elevations of
4,500 feet may cause pilot outage.

3
104306
OWNER’S MANUAL
PRODUCT
IDENTIFICATION
Figure 1 - Yellow Flame Vent-Free Gas Log Heater Shown (Logs May Vary by Model)
Operation
This heater is clean burning. It requires no
outside venting. There is no heat loss out a
vent or up a chimney. Heat is generated by
realisticdancing,yellowflames.Thisheater
isdesignedforvent-freeoperationwithflue
damper closed. State and local codes in
some areas prohibit the use of vent-free
heaters.
Safety Pilot
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.
1. Remove logs and heater base assem-
bly from carton. Note: Do not pick up
heater base assembly by burners. This
could damage heater. Always handle
base assembly by grate.
2. Remove all protective packaging ap-
plied to logs and heater for shipment.
3. Check all items for any shipping dam-
age. If damaged, promptly inform
dealer where you bought heater.
UNPACKING
PRODUCT
FEATURES
Remote
Control
AUTO
MAN
OFF
STATUS
ONLO
HI
TEMP
Front Log
Control Knob
Back Log
Base Grate
Burner
Piezo Ignitor
Crossover Log
Middle Log
Remote Selector Switch
Flame Adjustment Knob
LOCAL CODES
Install and use heater with care. Follow all
localcodes.Intheabsenceoflocalcodes,use
the latest edition of The National Fuel Gas
Code ANSI Z223, 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

4
104306
UVENTED NATURAL GAS LOG HEATER
CGD3924NR, CGB3924NR and CGB3930NR
AIR FOR
COMBUSTION AND
VENTILATION
Today’s homes are built more energy effi-
cient than ever. New materials, increased
insulation, and new construction methods
helpreduceheatlossinhomes.Homeowners
weatherstripandcaulkaroundwindowsand
doorstokeepthecoldairoutandthewarmair
in. During heating months, home owners
want their homes as airtight as possible.
While it is good to make your home energy
efficient,yourhomeneedstobreathe.Fresh
air must enter your home. All fuel-burning
appliances need fresh air for proper com-
bustion and ventilation.
Exhaustfans,fireplaces,clothesdryers,and
fuel burning appliances draw air from the
house to operate. You must provide ad-
equate fresh air for these appliances. This
will insure proper venting of vented fuel-
burning appliances.
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. Unconfined Space
3. Confined Space
The information on pages 4 through 6 will
help you classify your space and provide
adequate ventilation.
WARNING:This heater shall
notbeinstalledinaconfinedspace
or unusually tight construction
unless provisions are provided
foradequatecombustionandven-
tilation air. Read the following in-
structions to insure proper fresh
air for this and other fuel-burning
appliances in your home.
Unusually Tight Construction
The air that leaks around doors and win-
dows may provide enough fresh air for
combustion and ventilation. However, in
buildings of unusually tight construction,
you must provide additional fresh air.
Unusually tight construction is de-
fined as construction where:
a. walls and ceilings exposed to the
outside atmosphere have a con-
tinuous water vapor retarder with
a rating of one perm (6 x 10-11 kg
per pa-sec-m2) or less with open-
ings gasketed or sealed and
b. weather stripping has been
added on openable windows and
doors and
c. caulking or sealants are applied
to areas such as joints around
window and door frames, be-
tween sole plates and floors,be-
tween wall-ceiling joints, be-
tween wall panels, at penetra-
tionsfor 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 Space 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 m3per kw) of the aggregate
inputratingofallappliancesinstalledinthat
space.Roomscommunicatingdirectly with
the space in which the appliances are in-
stalled*, through openings not furnished
with doors, are considered a part of the
unconfined space.
This heater shall not be installed in a con-
fined space or unusually tight construction
unlessprovisions are providedforadequate
combustion and ventilation air.
*Adjoiningroomsarecommunicatingonly
iftherearedoorlesspassagewaysorventila-
tion grills between them.

5
104306
OWNER’S MANUAL
AIR FOR
COMBUSTION AND
VENTILATION
Continued
DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION
Determining if You Have a Confined or Unconfined Space
Use this work sheet to determine if you have a confined or unconfined space.
Space:Includestheroominwhichyouwillinstallheaterplusanyadjoiningroomswithdoorlesspassagewaysorventilationgrillsbetween
the rooms.
1. Determine the volume of the space (length x width x height).
Length x Width x Height = _________________cu. ft. (volume of space)
Example: Space size 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) = 2560 cu. ft. (volume of space)
If additional ventilation to adjoining room is supplied with grills or openings, add the volume of these rooms to the total volume of
the space.
2. Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space can support.
_________________ (volume of space) ÷50 cu. ft. = (Maximum Btu/Hr the space can support)
Example: 2560 cu. ft. (volume of space) ÷50 cu. ft. = 51.2 or 51,200 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in the space.
Vent-free heater ________________ Btu/Hr
Gas water heater* ________________ Btu/Hr
Gas furnace ________________ Btu/Hr
Vented gas heater ________________ Btu/Hr
Gas fireplace logs ________________ Btu/Hr
Other gas appliances*+________________ Btu/Hr
Total =________________ Btu/Hr
* Do not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and vents to the outdoors.
4. Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.
_________________ Btu/Hr (maximum the space can support)
_________________ Btu/Hr (actual amount of Btu/Hr used)
Example: 51,200 Btu/Hr (maximum the space can support)
79,000 Btu/Hr (actual amount of Btu/Hr used)
ThespaceintheaboveexampleisaconfinedspacebecausetheactualBtu/HrusedismorethanthemaximumBtu/Hrthespacecansupport.
You must provide additional fresh air. Your options are as follows:
A. Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoin-
ing room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 6.
B. Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 6.
C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconfined.
If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an unconfined space. You will need no
additional fresh air ventilation.
Example:
Gas water heater 40,000 Btu/Hr
Vent-free heater + 39,000 Btu/Hr
Total = 79,000 Btu/Hr
WARNING:Iftheareainwhichtheheatermaybeoperatedissmallerthanthatdefinedasanunconfinedspace
or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of
the methods described in the National Fuel Gas Code, ANSI Z223.1, 1992, Section 5.3 or applicable local codes.
Continued

6
104306
UVENTED NATURAL GAS LOG HEATER
CGD3924NR, CGB3924NR and CGB3930NR
AIR FOR
COMBUSTION AND
VENTILATION
Continued
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
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: Donot provide openings for
inlet or outlet air into attic if attic has a
thermostat-controlledpowervent.Heatedair
enteringtheatticwillactivatethepowervent.
Figure 2 - Ventilation Air from Inside Building
Outlet
Air Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option 2
Ventilation
Grills
Into Adjoining
Room,
Option 1
12"
12"
WARNING: Rework work-
sheet, adding the space of the
adjoiningunconfinedspace.The
combined spaces must have
enough fresh air to supply all
appliances in both spaces.

7
104306
OWNER’S MANUAL
INSTALLATION
NOTICE: A qualified service per-
son must install heater. Follow
all local codes.
WARNING: Before installing
in a solid fuel burning fireplace,
thechimneyflueandfireboxmust
be cleaned of soot, creosote,
ashes and loose paint by a quali-
fied chimney cleaner. Creosote
willigniteifhighlyheated.Adirty
chimneyfluemaycreateanddis-
tribute soot within the house. In-
spectchimneyfluefordamage.If
damaged,operateheaterwithflue
damper closed.
WARNING: Seal any fresh air
vents or ash clean-out doors lo-
catedonfloororwalloffireplace.
If not, drafting may cause pilot
outage or sooting. Use a heat-
resistant sealant. Do not seal
chimney flue damper.
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing, or other flammable
objectsarelessthan36inches
from the front, top, or sides of
the heater
• 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-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 Air for Com-
bustion and Ventilation, pages 4 through 6.
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.
NOTICE:Stateorlocalcodesmay
onlyallowoperationofthisappli-
ance in a vented configuration.
Check your state or local codes.
WARNING: Make sure the re-
moteselectorswitchisintheOFF
position before installing heater.
NOTICE: This heater is intended
foruseassupplementalheat.Use
this heater along with your pri-
mary heating system. Do not in-
stall this heater as your primary
heatsource. Ifyou havea central
heating system, you may run
system’scirculatingblowerwhile
usingheater.Thiswillhelpcircu-
late the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
INSTALLATION AND
CLEARANCES (Vent-Free
Operation Only)
WARNING:Maintainthemini-
mum clearances. If you can, pro-
vide greater clearances from
floor, ceiling, and adjoining wall.
Carefullyfollowtheinstructionsbelow.This
will ensure safe installation into a masonry
fireplace or factory-built U.L. 127 listed
vent-free firebox.
Minimum Wall and Ceiling
Clearances (see Figure 4)
A. Clearances from the side of the fire-
place opening to any combustible wall
should not be less than 16 inches.
B. Clearancesfrom thetopof thefireplace
openingto the ceilingshouldnot be less
than 42 inches.
Figure4-MinimumClearancetoWalland
Ceiling
Continued
LOG SIZING REQUIREMENTS
Minimum Firebox Size
Rear
Width
Log Front At 14"
Size Height Depth Width Depth
24" 17" 14" 28" 21"
30" 17" 14" 34" 24"
MINIMUM FIREPLACE
CLEARANCE TO
COMBUSTIBLE MATERIALS
Log Size Side Wall Ceiling
24" 16" 42"
42"
16"
Left and Right
Sides

8
104306
UVENTED NATURAL GAS LOG HEATER
CGD3924NR, CGB3924NR and CGB3930NR
INSTALLATION
Continued
Heat Resistant
Material (A)
Minimum Non-Combustible
Material Clearances
If Not Using Mantel
Note: If using a mantel, go to If Using
Mantel. If not using a mantel, follow the
information on this page.
Youmusthavenon-combustiblematerial(s)
above the fireplace opening. Non-combus-
tible materials (such as slate, marble, tile,
etc.) must be at least 1/2 inch thick. With
sheet metal, you must have non-combus-
tible material behind it. Non-combustible
material must extend at least 8" up (for all
models).Ifnon-combustiblematerialisless
than12",youmustinstallthefireplacehood
accessory (24" and 30" models only). See
Figure 5 for minimum clearances.
IMPORTANT: If you cannot meet these
minimum clearances, you must operate
heater with chimney flue damper open.
If Using Mantel
Youmusthavenon-combustiblematerial(s)
above the fireplace opening. Non-combus-
tible materials (such as slate, marble, tile,
etc.) must be at least 1/2 inch thick. With
sheet metal, you must have non-combus-
tible material behind it. Non-combustible
materialmustextendatleast8inchesup(for
all models). If non-combustible material is
less than 12", you must install the fireplace
hood accessory (24" and 30" models only).
Even if non-combustible material is more
than 12", you may need the hood accessory
todeflectheatawayfromyourmantelshelf.
See Figure 5 and Figures 6 and 7 on page 9
for minimum clearances.
IMPORTANT: If you cannot meet these
minimum clearances, you must operate
heater with chimney flue damper open.
Non-Combustible Requirements for
Material Distance (A) Safe Installation
12" or more Non-combustible material okay.
Between 8" and 12" Install fireplace hood accessory (GA6050, GA6052,
or GA6053, see Accessories , page 21).
Less than 8" Non-combustible material must be extended to at
least 8". See Between 8" and 12" , above. If you
cannot extend material, you must operate heater
with flue damper open.
Figure 5 - Heat Resistant Material (Slate, Marble, Tile, etc.) Above Fireplace

9
104306
OWNER’S MANUAL
INSTALLATION
Continued
Figure 6 - Minimum Mantel Clearances Without Using Hood
MANTEL CLEARANCES
If you meet minimum clearance between
mantel shelf and top of fireplace opening, a
hood is not required (see Figure 6).
If minimum clearances in Figure 6 are not
met, you must have a hood. When using a
hoodtherearestillcertainminimummantel
clearancesrequired.Followminimumclear-
ances shown in Figure 7 when using hood.
Continued
Minimum Non-
Combustible
Material
Minimum Non-
Combustible
Material Height
Distances to
Underside of
Mantel
Top of Fireplace
Opening
Underside of
Mantel Shelf
Mantel Shelf
12"
(A)
18" 20" 22" 24"
All minimum
distances are
in inches
Log Set
2
1/2
"
6"
8"
10"
24"/30" Models
NOTICE:If yourinstallationdoes
notmeettheminimumclearances
shown, you must do one of the
following:
• operate the logs only with the
flue damper open
• raise the mantel to an accept-
able height
• remove the mantel
14"
Min.
Combustible
Material
Non-Combustible Material
Hearth
5"
Min.
Combustible
Material
Minimum Non-
Combustible
Material 8"
Min. 12" 15" 18"
All minimum
distances are
in inches
Log Set
18", 24", 30"
Models
20"
2
1/2
"
6"
8"
10"
12"
Distances to
Underside of
Mantel
Hood
(GA6050, GA6052)
Top of Fireplace
Opening
Underside of
Mantel Shelf
Mantel Shelf
Floor Clearances
A. If installing appliance on the floor level,
youmustmaintaintheminimumdistance
of 14" to combustibles (see Figure 8).
B. If combustible materials are less than
14" to the fireplace, you must install
applianceat least5"above thecombus-
tible flooring (see Figure 9).
Figure9-MinimumFireplaceClearances
Above Combustible Flooring
Figure 7 - Minimum Mantel Clearances When Using Hood
Figure8-MinimumFireplaceClearances
If Installed at Floor Level
Log Set
All Models

10
104306
UVENTED NATURAL GAS LOG HEATER
CGD3924NR, CGB3924NR and CGB3930NR
Figure 10 - Attaching Flexible Gas Hose
to Heater
Figure 11 - Attaching Base Assembly to
Fireplace Floor
INSTALLATION
Continued
INSTALLING HEATER BASE
ASSEMBLY
IMPORTANT: Make sure the heater burn-
ersarelevel.Ifheaterisnotlevel,heaterwill
not work properly.
WARNING: If installing in a
sunken fireplace, special care is
needed. You must raise the fire-
place floor to allow access to
heater control panel. This will in-
sure adequate air flow and guard
against sooting. Raise fireplace
floorwithnon-combustible mate-
rial.Makesure materialis secure.
CAUTION: Do not pick up
heater base assembly by the
burner. This could damage
heater. Only handle base assem-
bly by grates.
WARNING: You must secure
this heater to fireplace floor. If
not, heater will move when you
adjust controls. Moving heater
may cause a gas leak. Flexible Gas Hose (if
allowed by local codes)
Fitting
Masonry Screw
Mounting
Flanges
Installation Items Needed
• hardwarepackage (providedwithheater)
• approvedflexible gas hose(notprovided)
(if allowed by local codes)
• sealant resistant to propane/LP gas, not
provided
• electric drill with 3/16" masonry drill bit
• two (2) 9-volt alkaline batteries (not in-
cluded)
1. Apply pipe joint sealant lightly to male
threads of the fitting to be threaded into
gas regulator. Connect approved flex-
ible gas hose to gas regulator of heater
(see Figure 10).
2. Locate masonary screws in hardware
package.
3. Position heater base assembly in fire-
place.
4. Mark screw locations through holes in
mounting flanges (see Figure 11). If in-
stallinginabrick-bottomfireplace,mark
screwlocationsin mortar joint ofbricks.
5. Remove heater base from fireplace.
6. Drill holes at marked locations using
3/16" masonry drill bit.
7. Attach base assembly to fireplace floor
usingtwo masonry screws(inhardware
package) (see Figure 11).
8. Connect to gas supply. See Connect-
ing To Gas Supply, page 11.
CAUTION: Donot removethe
metal data plates attached to the
heater base assembly. The data
platescontainimportantwarranty
information.

11
104306
OWNER’S MANUAL
CAUTION: Avoid damage to
regulator.Holdgasregulatorwith
wrenchwhenconnectingittogas
piping and/or fittings.
INSTALLATION
Continued
Continued
CONNECTING TO GAS
SUPPLY
NOTICE: A qualified service per-
son must connect heater to gas
supply. Follow all local codes.
Installation Items Needed
Beforeinstallingheater,makesureyouhave
the items listed below.
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• manual shutoff valve *
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
* 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
Accessories, page 21.
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
yourlocalcodes.Usepipeof1/2"
diameter or greater to allow
proper gas volume to heater. If
pipe is too small, undue loss of
pressure will occur.
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 12).
Apply pipe joint sealant lightly to male
threads. This will prevent excess sealant
fromgoing into pipe.Excesssealant in pipe
could result in clogged heater valves.
CAUTION:Usepipejointseal-
ant that is resistant to liquid pe-
troleum (LP) gas.
Installsedimenttrapinsupplylineasshown
in Figure 12. Locate sediment trap where it
is within reach for cleaning. Locate sedi-
menttrap wheretrappedmatter isnotlikely
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.
Figure 12 - Gas Connection
*PurchasetheoptionalA.G.A.design-certifiedmanualshutoffvalvefromyourdealer.See
Accessories, page 21.
** Minimum inlet pressure for purpose of input adjustment.
Tee Joint
Pipe
Nipple
Cap
3" Minimum
Sediment
Trap
Gas Control
From Gas Meter
(5" W.C.** to
10.5" W.C.
Pressure)
A.G.A. Design-Certified Manual
Shutoff Valve With 1/8" NPT Tap*
Approved Flexible Gas Hose
(if allowed by local codes)
WARNING:Neveruseanopen
flame to check for a leak. Apply a
mixture of liquid soap and water
toalljoints.Bubblesformingshow
a leak. Correct all leaks at once.
WARNING: Test all gas pip-
ing and connections for leaks
after installing or servicing. Cor-
rect all leaks at once.
CHECKING GAS
CONNECTIONS
Pressure Testing gas Supply
Piping system
TestPressuresInExcessOf1/2PSIG
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.
6. Re-connect heater and manual shutoff
valve to gas supply. Check re-con-
nected fittings for leaks.

12
104306
UVENTED NATURAL GAS LOG HEATER
CGD3924NR, CGB3924NR and CGB3930NR
INSTALLATION
Continued
Figure 13 - Manual Shutoff Valve
ON
POSITION
OFF
POSITION
Open
Manual
Shutoff
Valve
Figure 14 - Checking Gas Joints
Gas Meter
Manual
Shutoff
Valve
Thermostat Gas Valve or
Control Valve Location
Closed
9-VOLT BATTERY
INSTALLATION
Two9-volt alkaline batteries(notincluded)
are required to operate this heater with the
wireless hand-held remote control set. One
battery must be installed in the receiver and
one in the hand-held remote control unit.
Note: Only use alkaline batteries.
Installing 9-Volt Alkaline Battery
In Receiver
1. Locate back of receiver under front
burner of heater.
2. Locate the battery clip mounted on the
back of the receiver.
3. Slide a 9-volt alkaline battery through
the clip.
4. Attach the teminal wires to the battery.
Installing 9-Volt Battery In Hand-
Held Remote Control Unit
1. Remove battery cover on back of re-
mote control unit.
2. Attack terminal wires to the battery.
Place battery into the battery housing.
3. Replace battery coveronto remote con-
trol unit.
Figure 15 - Installing 9-Volt Battery In
Receiver
Battery Cover
Terminal
Wires
9-Volt
Battery
Remote
Control
Unit
Battery
Housing
Receiver
Terminal
Wires
9-Volt Battery
Figure 16 - Installing Battery In Hand-
Held Remote control Unit
TestPressuresEqualToorLessThan
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 Fig-
ure 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 15 through 17). Check all other
internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to
Appliance, page 16).

13
104306
OWNER’S MANUAL
3
INSTALLATION
Continued
WARNING:Failureto position
thepartsinaccordancewiththese
diagrams or failure to use only
parts specifically approved with
this heater may result in property
damage or personal injury.
INSTALLING LOGS
(CGD3924NR)
Each log is marked with a number. These
numbers will help you identify the log when
installing.It isveryimportant to installthese
logs exactly as instructed. Do not modify
logs. Only use logs supplied with heater.
1. Locate pegs on the bottom of back log
(#1). Slide these pegs into the holes in
the grate base behind the burner (see
Figure 17).
2. Place the base of the middle log (#2) in
the U-shaped slots of the grate base in
front of the back log. The cutout on the
rightofthemiddle log should fitoverthe
burner (see Figure 18). Make sure the
front of the middle log is resting on the
tabs of the grate base and the cutout area
is centered over the burner “U” bend.
3. Locate the recesses on the back of the
front log (#3). Fit these recesses be-
tween the posts of the grate base (see
Figure 19).
4. Locate the notches in the bottom of the
crossover log (#4). Place the crossover
log on top of the middle log and front
log.Make surethenotches ofthecross-
overlog lines up withrectangularknobs
on top of the middle and front logs (see
Figure 20).
5. Add lava rock around base of heater.
Do not place any lava rock on logs or
burner.
Figure 17 - Installing Back Log (#1)
Figure 18 - Installing Middle Log (#2)
Figure 19 - Installing Front Log (#3)
Figure 20 - Installing Crossover Log (#4)
Peg
Hole in
Grate Base
Back Log (#1)
Burner
Tab
U-Shaped
Slot
Middle Log (#2)
Crossover Log (#1)
Notches
Rectangular
Knobs
“U” Bend
Front Log (#3)
Recess
Post
Post
Burner
Cutout
Continued
CAUTION: After installation
andperiodicallythereafter,check
to ensure that no flame comes in
contact with any log. If so, repo-
sition logs according to the log
installation instructions in this
manual. Flames contacting logs
will create soot.

14
104306
UVENTED NATURAL GAS LOG HEATER
CGD3924NR, CGB3924NR and CGB3930NR
INSTALLING LOGS ON
MODELS CGB3924PR AND
CGB3930PR
WARNING:Failureto position
thepartsinaccordancewiththese
diagrams or failure to use only
parts specifically approved with
this heater may result in property
damage or personal injury.
Each log is marked with a number. These
numbers will help you identify the log when
installing.It isveryimportant to installthese
logs exactly as instructed. Do not modify
logs. Only use logs supplied with heater.
INSTALLATION
Continued
Figure 21 - Installing Middle Log (#1)
Middle Log (#1)
Tab
Burner
“U” Bend
U-Shaped
Slot
Hole in
Grate Base
Back Log (#2)
Peg
Burner
Figure 22 - Installing Back Log (#2)
Crossover Log (#3)
Recess
Peg
Figure 23 - Installing Crossover Log (#3)
Front Log (#4)
Notches
Grate Fingers
Figure 24 - Installing Front Log (#4)
Figure 25 - Installing Log Piece (#5)
Log Piece (#5)
Peg
CAUTION: After installation
andperiodicallythereafter,check
to ensure that no flame comes in
contact with any log. If so, repo-
sition logs according to the log
installation instructions in this
manual. Flames contacting logs
will create soot.
1. Place the base of the middle log (#1) in
the U-shaped slots of the grate base.
The cutout on the right of the middle
log should bit over the burner (see Fig-
ure 21). Make sure the front of the
middle log is resting on the tabs of the
grate base and the cutout area is cen-
tered over the burner “U” bend.
2. Locate pegs on the bottom of back log
(#2). Slide these pegs into the holes in
the grate base behind the burner (see
Figure 22).3. Place crossover log (#3)
onto the pin (right) on middle log (#1)
and into the recess of the back log
(#2) (see Figure 23).
4. Locate the notches in the bottom of the
front log (#4). Place the front log on
thegrate fingers. Makesurethe notches
of the front log line up with the grate
fingers (see Figure 24).
5. With knot to right side, place smaller
log piece (#5) over the pin on the lift
side of the middle log. The smaller log
will rest on front log against the “knot”
on the left (see Figure 25).
6. Add lava rock around base of heater.
Do not place any lava rock on logs or
burner.

15
104306
OWNER’S MANUAL
1. STOP! Read the safety information
above.
2. Make sure manual shutoff valve is
fully open.
3. Setremoteselectorswitch intheOFF
position.
WARNING: If you do not fol-
low these instructions exactly, a
fireorexplosionmayresultcaus-
ing property damage, personal
injury or loss of life.
A. Thisappliance hasapilotwhichmust
belightedbyhand.Whenlightingthe
pilot,followtheseinstructionsexactly.
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 IF YOU SMELL
GAS
• Do not try to light any appliance.
• Donottouchanyelectric switch;do
notuse anyphonein your building.
• Immediatelycallyourgas 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 topushinor turn
thegas controlknob. Neverusetools.
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.
WARNING:
• If fireplace has glass doors,
never operate this heater with
glassdoorsclosed.Ifyouoper-
ate heater with doors closed,
heatbuildupinsidefireplacewill
cause glass to burst. Also if
fireplace opening has vents at
the bottom, you must open the
vents before operating heater.
• You must operate this heater
withafireplacescreeninplace.
Make sure fireplace screen is
closed before running heater.
NOTICE: During initial operation
of new heater, burning logs will
give off a paper-burning smell.
Orange flame will also be present.
Open damper or window to vent
smell.Thiswillonlylastafewhours.
Note: Homeowners generally prefer to
operate their heater with the chimney
damper closed. This will put all the heat
into the room. However there may be
times you will desire the full flames of the
Hiheatsettingbutwillfindtheheatoutput
excessive. You can open the chimney
damper(ifyouhaveone)fullyorpartially
to release some of the heat.
OPERATING
HEATER WARNING:Burnerswillcome
on automatically within one
minutewhen theremoteselector
switch is in the ON position after
the pilot is lit.
Continued
FOR YOUR SAFETY
READ BEFORE
LIGHTING
LIGHTING
INSTRUCTIONS
WARNING: Damper handle
will be hot if heater has been
running.
4. Pressinand turn controlknob clock-
wise to the OFF position.
5. Waitfive(5) minutesto clearout any
gas. Then smell for gas, including
near the floor. If you smell gas,
STOP! Follow “B” in the safety in-
formation above. If you don’t smell
gas, go to the next step.
6. Pressinand turncontrolknobcoun-
terclockwise to the PILOT
position. Press in control knob for
five (5) seconds (see above).
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 or more. This will al-
low air to bleed from the gas system.
7. With control knob pressed in, press
and release ignitor button. This will
lightpilot.Thepilotis attachedtothe
front burner. If needed, keep press-
ing ignitor button until pilot lights.
Note: If pilot does not stay lit, con-
tact a qualified service person or gas
supplierforrepairs.Until repairsare
made,light pilotwithmatch.Tolight
pilot with match, see Manual Light-
ing Procedure on page 16.
8. Keep control knob pressed in for 30
seconds after lighting pilot.After 30
seconds, release control knob.
• If control knob does not pop out
when released, contact a qualified
service person or gas supplier for
repairs.
Note: If pilot goes out, repeat steps
4 through 8.
Figure 26 - Control Knob and Ignitor Button Location
O
F
F
P
I
L
O
T
O
N
L
O
I
H
REMOTE
OFF
ON
Control Knob
Ignitor Button Selector Switch in OFF Position
Flame Adjustment Knob

16
104306
UVENTED NATURAL GAS LOG HEATER
CGD3924NR, CGB3924NR and CGB3930NR
TO TURN OFF GAS
TO APPLIANCE
1. Followsteps 1through6under Light-
ing Instructions, pages 15 and 16.
2. Depress control knob and light pilot
with match.
3. Keep control knob pressed in for 30
seconds after lighting pilot.After 30
seconds, release control knob. Now
follow step 9, column 1.
Figure 27 - Setting the Remote Selector Switch, Control Knob, and Flame Adjustment
Knob for Remote Operation
ON
OFF
REMOTE
O
F
F
P
I
L
O
T
O
N
L
O
I
H
Remote Selector Switch in Remote Position
Control Knob in On Position
Flame Adjustment Knob
1. Afterlighting,let pilotflameburnfor
aboutone minute.Turn control knob
to ON position.Adjust flame adjust-
ment knob anywhere between HI
and LO. Slide the remote selector
switchtothe REMOTEposition.The
burners will come on. You can now
turn the burners on and off with the
hand-held remote control unit.
HAND HELD REMOTE
OPERATION
NOTICE: You must light the pilot
before using the hand-held re-
mote control unit. See Lighting
Instructions on page 15.
OPERATING
HEATER
Continued
Figure 25 - Pilot
CAUTION:Donottrytoadjust
heating levels by using the
manual shutoff valve.
WARNING: Make sure the re-
mote selector switch is in the
OFF position when you are away
from home for long periods of
time. Heater will come on auto-
matically with remote selector
switch in the ON position.
9. Slightly push in and turn control
knob counterclockwise to
the ON position.
10. Wait one minute and switch remote
selector switch to the ON position to
light burners.
11. Set flame adjustment knob to any
level between HI and LO.
Shutting Off Heater
1. Turncontrolknobclockwise
to the OFF position.
2. Set remote selector switch in the OFF
positiontokeepfromdrainingbattery.
Shutting Off Burners Only
(pilot stays lit)
You may shut off the burners and keep
thepilot litby doingoneof thefollowing:
• Turn control knob clockwise
to the PILOT position.
• UseremotecontrolmanualOFFbutton.
• Set remote selector switch in the OFF
position.
Ignitor Electrode
Pilot Burner
THERMOSTAT
CONTROL
OPERATION
The thermostat control setting on the
remote control unit can be set to any
comfort level between HI and LO. The
Burners will turn on and off automati-
cally to maintain the comfort level you
select.Theidealcomfortsettingwillvary
byhouseholddependingupontheamount
of space to be heated, the output of the
central heating system, etc.
MANUAL LIGHTING
PROCEDURE
IMPORTANT: Do not leave the re-
moteselectorswitchintheREMOTE
positionwhen thepilot isnotlit.This
will drain the battery.
2. Select the MANUAL orAUTO button
on the hand-held remote control unit.
• In MANUAL mode, turn burners
on or off by pressing the ON or
OFF buttons on the hand-held re-
mote control unit.
• InAUTOmode,theroomtempera-
ture is controlled by the thermo-
stat in the hand-held remote con-
trolunit.Toincreasetheroomtem-
perature,pressthetop arrowofthe
TEMP button. To lower room the
temperature, press the bottom ar-
rowtotheTEMPbutton.Athigher
settings the heater will run more.
IMPORTANT: Thehand-heldremote
control unit must be near the heater.
Do not keep the hand-held remote
control unit too close the heater. The
thermostat on the hand-held remote
control unit will heat up too quickly
and turn the heater off.
3. Usethe STATUS buttononthe hand-
held remote control unit to see the
operation mode being used and the
temperature setting selected. A red
light will come on beside the opera-
tion mode being used when the sta-
tus button is pressed.
4. To turn the burners off when oper-
ating in the MANUAL mode, press
the OFF button. If operating in the
automode, pressthemanual button,
then press the OFF buttonThe pilot
will remain lit. IMPORTANT: To
turn the pilot off, manually turn the
control knob on the heater to the
OFF position or set remote selector
switch to OFF position.

17
104306
OWNER’S MANUAL
OPERATING
HEATER
Continued
TEMP
STATUS
HI
LO
MAN ON
AUTO OFF
Increases Room
Temperature
Decreases Room
Temperature
Turns Burners
On and Off
Shows Current
Operation Mode
Shows Temperature Setting
Figure 28 - Thermostat Hand-Held Remote Control Unit Selections
The log heater will automatically
cycle between pilot and the heat
setting that has been selected.
Thermocouple
Pilot Burner
Figure 29 - Correct Pilot Flame Pattern
Figure 30 - Incorrect Pilot Flame Pattern
INSPECTING
BURNERS
Check pilot flame pattern and burner flame
patterns often.
PILOT FLAME PATTERN
Figure29showsacorrectpilotflamepattern.
Figure 30 shows an incorrect pilot flame
pattern.Theincorrectpilotflameisnottouch-
ing the thermocouple. This will cause the
thermocouple to cool. When the thermo-
couple cools, the heater will shut down.
If pilot flame pattern is incorrect, as shown
in Figure 30
• turn heater off (see To Turn Off Gas to
Appliance, page 16)
• seeTroubleshooting,pages18through 20
Thermocouple
Pilot Burner
Allows Burners to be
Turned On and Off with the
Hand-Held Remote Unit.
CLEANING AND
MAINTENANCE
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,
pet hair, etc.
ODS/PILOT AND BURNER
• Use a vacuum cleaner or small, soft
bristled brush to clean.
LOGS
• If you remove logs for cleaning, refer to
InstallingLogs,pages 13 and14,to prop-
erly replace logs.
• Replace log(s) if broken or chipped
(dime-sized or larger).
BURNER PRIMARY AIR
HOLE
Air is drawn into the burner through the 8
holes in the brass fitting at the burner en-
trance. There holes may become blocked
with dust or lint. Periodically inspect these
holes for any blockage and clean if needed.
Blocked air holes will create soot.
MAIN BURNER
Periodically inspect all burner flame holes
with the heater running. All slotted burner
flame holes should be open with yellow
flamepresent.Allroundburner flame holes
should be open with a small blue flame
present. Some burner flame holes may be-
come blocked by debris or rust, with no
flame present. If so, turn off heater and let
cool. Either remove blockage or replace
burner. Blocked burner flame holes will
create soot.
MAIN BURNER
Periodically inspect all burner flame holes
with the heater running. All slotted burner
flame holes should be open with yellow
flamepresent.Allroundburner flame holes
should be open with a small blue flame
present. Some burner flame holes may be-
come blocked by debris or rust, with no
flame present. If so, turn off heater and let
cool. Either remove blockage or replace
burner. Blocked burner flame holes will
create soot.

18
104306
UVENTED NATURAL GAS LOG HEATER
CGD3924NR, CGB3924NR and CGB3930NR
TROUBLESHOOTING
Note: Alltroubleshootingitemsarelistedin
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.
POSSIBLE CAUSE
1. Ignitor electrode not connected to igni-
tor cable
2. Ignitor cable pinched or wet
3. Piezo ignitor nut is loose
4. Broken ignitor cable
5. Bad piezo ignitor
6. Ignitor electrode broken
7. Ignitor electrode positioned wrong
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
PILOT 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 notpressedin longenough
3. Manual shutoff valve not fully open
4. 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
5. Thermocouple connection loose at con-
trol valve
6. Thermocouple damaged
7. Control valve damaged
REMEDY
1. Reconnect ignitor cable
2. Free ignitor cable if pinched by any
metal or tubing. Keep ignitor cable dry
3. Tighten nutholding piezo ignitorto base
panel of log set. Nut is located behind
base panel.
4. Replace ignitor cable
5. Replace piezo ignitor
6. Replace piezo ignitor
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 holdingdowncontrolknob. Re-
peatignitingoperationuntilairisremoved
5. Clean ODS/pilot (see Cleaning and
Maintenance, page 17) or replace ODS/
pilot assembly
6. Replace gas control
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. A) Contact local natural gas company
B) Clean ODS/pilot (see Cleaning and
Maintenance, page 17) or replace ODS/
pilot assembly
5. Hand tighten until snug, then tighten 1/4
turn more
6. Replace thermocouple
7. Replace control valve
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

19
104306
OWNER’S MANUAL
OBSERVED PROBLEM
Burner does light after ODS/pilot is lit
Delayed ignition burner
Burner backfiring during combustion
Slightsmokeor odor during initialoperation
Moisture/condensationnoticedonwindows
Heater produces a whistling noise when
burner is lit
Whitepowderresidueformingwithinburner
box or on adjacent walls or furniture
Remote doesn't function
REMEDY
1. Clean burner (see Cleaning and Mainte-
nance, page 17) or replace burner orifice
2. Contact local natural gas company
3. Replace burner orifice
4. Reconnect leads (see Wiring Diagram,
page 21)
5. Replace battery intransmitterandreceiver
1. Contact local natural gas company
2. Clean burner (see Cleaning and Mainte-
nance, page 17) or replace burner orifice
1. Clean burner (see Cleaning and Mainte-
nance, page 17) or replace burner orifice
2. Replace damaged burner
3. Replace gas control
1. Check burner for dirt and debris. If
found, clean burner (see Cleaning and
Maintenance, page 17)
2. Replace gas control
3. Problem will stop after a few hours of
operation
1. Refer to Air for Combustion and Venti-
lation requirements (page 4)
1. Turn control knob to LO position and
let warm up for a minute
2. Operateburner untilairis removedfrom
line. Have gas line checked by local
natural gas company
3. Observe minimum installation clear-
ances (see pages 7 through 9)
4. Clean burner (see Cleaning and Mainte-
nance, page 17) or replace burner orifice
1. Turn heater off when using furniture
polish, wax, carpet cleaners or similar
products
1. Replace 9-volt batteries in receiver and
remote control
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1. Burner orifice clogged
2. Inlet gas pressure is too low
3. Burner orifice diameter is too small
4. Thermopile leads disconnected or im-
properly connected
5. Burners will not come on in remote
position
1. Manifold pressure is too low
2. Burner orifice clogged
1. Burner orifice is clogged or damaged
2. Damaged burner
3. Gas regulator defective
1. Not enough air
2. Gas regulator defective
3. Residues from manufacturing processes
and logs curing
1. Not enough combustion/ventilation air
1. Turning control knob to HI position
when burner is cold
2. Air in gas line
3. Air passageways on heater blocked
4. Dirty or partially clogged burner orifice
1. When heated, vaporsform furniture pol-
ish, wax, carpet cleaners, etc. turn into
white powder residue
1. Battery is not installed. Battery power
is low
Continued

20
104306
UVENTED NATURAL GAS LOG HEATER
CGD3924NR, CGB3924NR and CGB3930NR
TROUBLESHOOTING
Continued
WARNING: If you smell gas
• Shut off gas supply.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your
building.
• Immediatelycallyourgassupplierfromaneighbor’sphone.Followthe
gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
POSSIBLE CAUSE
1. Metal expanding while heating or con-
tracting while cooling
1. Heater burning vapors from paint, hair
spray, glues, cleaners, chemicals, new
carpet, etc. (See IMPORTANT state-
ment above)
2. Gas leak. SeeWarning statement at
top of page
1. Not enough fresh air is available
2. Low line pressure
3. ODS/pilot is partially clogged
1. Gas leak. SeeWarning statement at
top of page
2. Control valve defective
1. Foreign matter between control valve
and burner
2. Gas leak. SeeWarning statement at
top of page
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
REMEDY
1. This is common with most heaters. If
noise is excessive, contact qualified ser-
vice person
1. Open window and ventilate room. Stop
usingodor causing productswhileheater
is running
2. Locate and correct all leaks (see Check-
ing Gas Connections, page 12)
1. Open window and/ordoorforventilation
2. Contact local natural gas company
3. Clean ODS/pilot (see Cleaning and
Maintenance, page 17)
1. Locate and correct all leaks (see Check-
ing Gas Connections, page 12)
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 12)
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.,createfumes.Thesefumes maymixwithcombustionairandcreateodors.Theseodors
will disappear over time.