Comfort Glow CGS2718N Quick start guide

Save this manual for future reference.
WARNING:Iftheinformationinthismanual
is not followed exactly, a fire or explosion
may result causing property damage, per-
sonal injury, or loss of life.
— Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do
not use any phone in your building.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier,
call the fire department.
— Installation and service must be per-
formed by a qualified installer, service
agency, or the gas supplier.
WARNING: Improper installation, ad-
justment, alteration, service, or main-
tenance can cause injury or property
damage. Refer to this manual for cor-
rectinstallationandoperationalproce-
dures. For assistance or additional in-
formation consult a qualified installer,
service agency, or the gas supplier.
18" and 24" Variable
Manually-Controlled Models
ROYAL ENGLISH OAK AND WINCHESTER OAK
UNVENTED (VENT-FREE)
NATURAL GAS LOG HEATER
This appliance may be installed in an aftermar-
ket,* permanently located, manufactured (mo-
bile)home,wherenotprohibitedbylocalcodes.
This appliance is only for use with the type of
gasindicatedontheratingplate.Thisappliance
is not convertible for use with other gases.
(Winchester Oak Model Shown)
24" Thermostatically-
Controlled Model
CLD3924NTA
CGS2718N
CGS3124N
CLD3018NA
WARNING: This is an unvented gas-
firedheater.Itusesair(oxygen)from
the room in which it is installed. Pro-
visionsforadequatecombustionand
ventilation air must be provided. Re-
ferto AirforCombustionandVentila-
tion sectiononpage4ofthismanual.
WARNING: This appliance is for in-
stallationonlyinasolid-fuelburning
masonry or UL127 factory-built fire-
place, or in an approved ventless
firebox.Itisdesign-certifiedforthese
installationsinaccordancewithANS
Z21.11.2. Exception: Do not install
this appliance in a factory-built fire-
placethatincludesinstructionsstat-
ing it has not been tested or should
not be used with unvented gas logs.
VARIABLE MANUALLY-CONTROLLED MODELS ALSO DESIGN-CERTIFIED
AS VENTED DECORATIVE APPLIANCES
OWNER’S OPERATION AND INSTALLATION MANUAL
Patent
Pending
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer

2
107067
UNVENTED NATURAL GAS LOG HEATER
CGS2718N, CGS3124N,
CLD3018NA, and CLD3924NTA
SAFETY
INFORMATION
DANGER: Carbon monoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs
of carbon monoxide poisoning resemble the
flu,withheadaches,dizziness,ornausea.Ifyou
havethesesigns,theheatermaynotbeworking
properly. Get fresh air at once! Have heater
serviced. Some people are more affected by
carbon monoxide than others. These include
pregnant women, people with heart or lung
diseaseor anemia,thoseunderthe influenceof
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 added tothe gascan fade.Gas may
be present even though no odor exists.
Make certain you read and understand all
warnings.Keepthismanualforreference.It
isyourguidetosafeandproperoperationof
this heater.
WARNINGS
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, oper-
ate, or service this heater. Im-
properuseofthisheatercancause
seriousinjuryordeathfromburns,
fire, explosion, electrical shock,
and carbon monoxide poisoning.
1. This appliance is only for use with the
typeof gasindicated onthe ratingplate.
Thisappliance isnot convertiblefor 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 cannotreach yourgas supplier,
call the fire department
3. This heatershallnotbeinstalled inabed-
room or bathroom unless installed as a
vented appliance (Variable Manually-
ControlledModelsOnly) (seeInstalling
Damper Clamp Accessory for Vented
Operation, page 10).
4. Before installing in a solid fuel burn-
ingfireplace, the chimneyflue andfire-
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.
5. If fireplace has glass doors, never op-
eratethis heaterwith glassdoorsclosed.
Ifyou operate heaterwith 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.
6. This logheater isdesignedto besmoke-
less. If logs ever appear to smoke, turn
off heater and call a qualified service
person. Note: During initial operation,
slight smoking could occur due to log
curing and heater burning manufactur-
ing residues.
7. To prevent the creation of soot, follow
the instructions in Cleaning and Main-
tenance, page 18.
8. Before usingfurniture polish,wax, car-
pet cleaner, or similar products, turn
heater off. If heated, the vapors from
theseproducts may createa whitepow-
der residue within burner box or on
adjacent walls or furniture.
9. This heaterneeds fresh,outside airven-
tilation to run properly.This heater has
an Oxygen Depletion Sensing (ODS)
safety shutoff system. The ODS shuts
down the heater if not enough fresh air
is available. See Air for Combustion
and Ventilation, pages 4 through 6. If
heater keeps shutting off, see Trouble-
shooting, pages 19 through 21.
10. Do not run heater
• where flammable liquids or vapors
are used or stored
• under dusty conditions
11. Do not use this heater to cook food or
burn paper or other objects.
12. Do not use heater if any part has been
exposed to or under water. Immediately
call a qualified service technician to in-
spectthe roomheater andto replaceany
part of the control system and any gas
control which has been under water.
WARNING: Any change to
this heater or its controls can be
dangerous.
WARNING: Do not allow fans
toblowdirectlyintothefireplace.
Avoidanydraftsthatalterburner
flame patterns. Ceiling fans can
create drafts that alter burner
flame patterns. Altered burner
patterns can cause sooting.
WARNING: Do not use a
blower insert, heat exchanger
insert or other accessory not ap-
proved for use with this heater.
Due to high temperatures, the
appliance should be located out
oftrafficandaway from furniture
and draperies.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the heater.
Heater base assembly 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 be-
fore touching.
Carefully supervise young chil-
dren when they are in the room
with heater.
Youmustoperatethisheaterwith
a fireplace screen in place. Make
sure fireplace screen is closed
before running heater.
Keeptheapplianceareaclearand
free from combustible materials,
gasoline, and other flammable
vapors and liquids.

3
107067
OWNER’S MANUAL
PRODUCT
IDENTIFICATION
Figure 1 - Yellow Flame Vent-Free Gas Log Heater Shown (Logs May Vary by Model)
LOCAL CODES
Install and use heater with care. Follow all
local codes. In the absence of local codes, use
the latest edition of The National Fuel Gas
CodeANS Z223.1,also knownas 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
Note: Where listed vented decorative logs
arerequired, thermostatmodelsarenot per-
mitted.
UNPACKING
PRODUCT
FEATURES
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
realistic,dancingyellowflames.Thisheater
isdesignedforvent-freeoperationwithflue
damper closed. It has been tested and ap-
proved to ANS Z21.11.2 standard for
unvented heaters. State and local codes in
some areas prohibit the use of vent-free
heaters. Non-thermostat models may also
be operated as a vented decorative (ANS
Z21.60) product by opening flue damper.
SAFETY PILOT
This heater has a pilot with an Oxygen
Depletion Sensing (ODS) safety shutoff
system. The ODS/pilot is a required feature
for vent-free room heaters. The ODS/pilot
shuts off the heater if there is not enough
fresh air.
PIEZO IGNITION SYSTEM
This heater has a piezo ignitor. This system
requires no matches, batteries, or other
sources to light heater.
WARNING: Do not remove
the metal Data Plates from the
grate assembly. The Data Plates
contain important product
information.
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.
Front Log
Control Knob
Back Log
Burner
Piezo
Ignitor
Crossover Log
SAFETY
INFORMATION
Continued
13. Do not operate heater if any log is bro-
ken. Do not operate heater if a log is
chipped (dime-sized or larger).
14. Turn heater off and let cool before ser-
vicing. Only a qualified service person
should service and repair heater.
15. Operating heater above elevations of
4,500 feet could cause pilot outage.

4
107067
UNVENTED NATURAL GAS LOG HEATER
CGS2718N, CGS3124N,
CLD3018NA, and CLD3924NTA
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
weatherstripand caulkaroundwindowsand
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.
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.
PROVIDING ADEQUATE
VENTILATION
The following are excerpts from National
Fuel Gas Code. NFPA 54/ANS Z223.1, Sec-
tion5.3, Air forCombustion andVentilation.
Allspacesinhomesfallintooneofthethree
following ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 4 through 6 will
help you classify your space and provide
adequate ventilation.
Unusually Tight Construction
The air that leaks around doors and win-
dows may provide enough fresh air for
combustion and ventilation. However, in
buildings of unusually tight construction,
you must provide additional fresh air.
Unusually tight construction is de-
fined as construction where:
a. walls and ceilings exposed to the
outside atmosphere have a con-
tinuous water vapor retarder with
a rating of one perm (6x10-11 kg
per pa-sec-m2) or less with open-
ings gasketed or sealed and
b. weather stripping has been
added on openable windows and
doors and
c. caulking or sealants are applied
to areas such as joints around
window and door frames, be-
tween sole plates and floors,be-
tween wall-ceiling joints, be-
tween wall panels, at penetra-
tionsforplumbing,electrical,and
gas lines, and at other openings.
If your home meets all of the three
criteria above, you must provide ad-
ditional fresh air. See Ventilation Air
From Outdoors , page 6.
If your home does not meet all of the
three criteria above, proceed to De-
termining Fresh-Air Flow For Heater
Location on page 5.
Confined Space and Unconfined
Space
The National Fuel Gas Code ANS Z223.1
defines a confined space as a space whose
volume is less than 50 cubic feet per 1,000
Btu per hour (4.8 m3per kw) of the aggre-
gate input rating of all appliances installed
in that space and an unconfined space as a
space whose volume is not less than 50
cubicfeetper1,000Btuperhour(4.8m3per
kw) of the aggregate input rating of all
appliances installed in that space. Rooms
communicating directly with the space in
whichtheappliancesareinstalled*,through
openings not furnished with doors, are con-
sidered a part of the unconfined space.
This heater shall not be installed in a con-
fined space or unusually tight construction
unlessprovisions areprovided foradequate
combustion and ventilation air.
*Adjoiningroomsarecommunicatingonly
iftherearedoorlesspassagewaysorventila-
tion grills between them.

5
107067
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)
71,500 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 +31,500 Btu/Hr
Total =71,500 Btu/Hr
WARNING:Iftheareainwhichtheheatermaybeoperatedissmallerthanthatdefinedasanunconfinedspace
or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of
the methods described in the National Fuel Gas Code, ANS Z223.1, Section 5.3 or applicable local codes .
Continued

6
107067
UNVENTED NATURAL GAS LOG HEATER
CGS2718N, CGS3124N,
CLD3018NA, and CLD3924NTA
AIR FOR
COMBUSTION AND
VENTILATION
Continued
WARNING: Rework work-
sheet, adding the space of the
adjoiningunconfinedspace.The
combined spaces must have
enough fresh air to supply all
appliances in both spaces.
Figure 3 - Ventilation Air from Outdoors
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or ducts. You must provide two per-
manent openings: one within 12" of the
ceiling and one within 12" of the floor.
Connecttheseitemsdirectlytotheoutdoors
orspacesopentotheoutdoors.Thesespaces
include attics and crawl spaces. Follow the
National Fuel Gas Code NFPA 54/ANS
Z223.1,Section5.3,AirforCombustionand
Ventilation for required size of ventilation
grills or ducts.
IMPORTANT: Do notprovideopeningsfor
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"
VENTILATION AIR
Ventilation Air From Inside
Building
Thisfreshairwouldcomefromanadjoin-
ing unconfined space. When ventilating
to an adjoining unconfined space, you
must provide two permanent openings:
one within 12" of the ceiling and one
within 12" of the floor on the wall con-
necting the two spaces (see options 1 and
2, Figure 2). You can also remove door
into adjoining room (see option 3, Figure
2). Follow the National Fuel Gas Code
NFPA54/ANSZ223.1,Section5.3,Airfor
Combustion and Ventilation for required
size of ventilation grills or ducts.

7
107067
OWNER’S MANUAL
WARNING: Never install the
heater
• in a bedroom or bathroom un-
less installed as a vented ap-
pliance (Variable Manually-
Controlled Models Only) (see
page 10)
• in a recreational vehicle
• where curtains, furniture,
clothing, or other flammable
objectsarelessthan42inches
from the front, top, or sides of
the heater
• in high traffic areas
• in windy or drafty areas
INSTALLATION
WARNING: A qualified ser-
vice person 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
chimneyflue maycreateanddis-
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.
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.
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.
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.
NOTICE:Stateorlocalcodesmay
onlyallowoperationofthisappli-
ance in a vented configuration.
Check your state or local codes.
NOTICE: This heater is intended
foruseassupplementalheat.Use
this heater along with your pri-
mary heating system. Do not in-
stall this heater as your primary
heatsource.If youhavea 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.
LOG SIZING REQUIREMENTS
Minimum Firebox Size
Log Front Rear
Size Height Depth Width Width*
18" 17" 14" 24" 20"
24" 17" 14" 28" 21"
MINIMUM FIREPLACE
CLEARANCE TO
COMBUSTIBLE MATERIALS
Log Size Side Wall Ceiling
18", 24" 16" 42"
*Measured at 14” depth
Continued
Carefullyfollowtheinstructionsbelow.This
will ensure safe installation into a masonry,
UL127-listedmanufacturedfireplace,orcer-
tified vent-free firebox.
Minimum Clearances For Side
Combustible Material, Side Wall,
and Ceiling
A. Clearances from the side of the fire-
place opening to any combustible ma-
terial and wall should follow diagram
in Figure 4.
B. Clearancesfrom the topof thefireplace
openingto theceiling shouldnot beless
than 42 inches.
Figure 4 - Minimum Clearance for Com-
bustible to Wall
.5 2
7/16
7/8
1
3
/ 4
3
1
/ 2
5
1
/ 4
7
8
3
/ 4
10
1
/ 2
12
1
/ 4
1 4 6 8 10 12 14 16
FIREBOX INCHES
INCHES
*Minimum 16 inches from Side Wall
*

8
107067
UNVENTED NATURAL GAS LOG HEATER
CGS2718N, CGS3124N,
CLD3018NA, and CLD3924NTA
INSTALLATION
Continued
Heat Resistant
Material (A)
Minimum Noncombustible
Material Clearances
If Not Using Mantel
Note: If using a mantel, proceed to If Using
Mantel. If not using a mantel, follow the
information below.
You must have noncombustible material(s)
above the fireplace opening. Noncombus-
tible materials (such as slate, marble, tile,
etc.) must be at least 1/2 inch thick. With
sheet metal, you must have noncombustible
material behind it. Noncombustible material
must extend at least 8" up (for all models). If
noncombustiblematerialislessthan12",you
mustinstallthefireplacehoodaccessory(24"
model only). See Figure 5 at right for mini-
mum clearances.
IMPORTANT: If you cannot meet these
minimum clearances, you must operate
heater with chimney flue damper open. Go
to Installing Damper Clamp Accessory for
Vented Operation, page 10.
Noncombustible Requirements for
Material Distance (A) Safe Installation
12" or more Noncombustible material okay.
Between 8" and 12" 24"Model:Installfireplacehoodacessory(GA6050,
GA6052, or GA6053, see Accessories , page 30).
18" Model: Noncombustible material okay.
Less than 8" Noncombustible 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
NOTICE: You may use non-ther-
mostat heater as a vented prod-
uct. If so, you must always run
heater with chimney flue damper
open. If running heater with
damper open, noncombustible
materialabovefireplaceopening
is not needed. Go to Installing
Damper Clamp Accessory for
Vented Operation , page 10
If Using Mantel
You must have noncombustible material(s)
above the fireplace opening. Noncombus-
tible materials (such as slate, marble, tile,
etc.) must be at least 1/2 inch thick. With
sheetmetal,youmusthavenoncombustible
material behind it. Noncombustible mate-
rial must extend at least 8 inches up (for all
models). If noncombustible material is less
than12",youmustinstallthefireplacehood
accessory (24" model only). Even if non-
combustible material is more than 12", you
mayneedthe hoodaccessorytodeflectheat
away from your mantel shelf. 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. Go
to Installing Damper Clamp Accessory for
Vented Operation, page 10.

9
107067
OWNER’S MANUAL
INSTALLATION
Continued
Figure 6 - Minimum Mantel Clearances Without Using Hood
MANTEL CLEARANCES
Inadditiontomeetingnoncombustiblemate-
rial clearances, you must also meet required
clearances between fireplace opening and
mantel shelf. If you do not meet the clear-
ances listed below, you will need a hood.
Determining Minimum Mantel
Clearance
If you meet minimum clearance between
mantel shelf and top of fireplace opening, a
hood is not required (see Figure 6).
Determining Minimum Mantel
Clearances when Using a Hood
If minimum clearances in Figure 6 are not
met, you must have a hood. When using a
hoodtherearestill certainminimummantel
clearancesrequired.Followminimumclear-
ancesshowninFigure7when usingahood.
Continued
14"
Min.
Combustible
Material
Noncombustible Material
Hearth
5"
Min.
Combustible
Material
Minimum Non-
Combustible
Material 8"
Min. 12" 15" 18"
All minimum
distances are
in inches
Log Set
18" and 24"
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
Figure9-MinimumFireplaceClearances
Above Combustible Flooring
Figure 7 - Minimum Mantel Clearances When Using Hood
Figure8-MinimumFireplaceClearances
If Installed at Floor Level
NOTICE:Ifyour installationdoes
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
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"
8"
(A)
18"
8"
20"
14"
22"
16
3
/4 "
24"
20"
All minimum
distances are
in inches
Log Set
24" Model
18" Model
2
1/2
"
6"
8"
10"
(GA6050, GA6052,
or GA6053)
FLOOR CLEARANCES
A. If installingapplianceon thefloor level,
you must maintain the minimum dis-
tance of 14" to combustibles (see Fig-
ure 8).
B. If combustible materials are less than
14" to the fireplace, you must install
applianceat least 5"above thecombus-
tible flooring (see Figure 9).
NOTICE:Surfacetemperaturesof
adjacent walls and mantels be-
comehotduringoperation.Walls
and mantels above the firebox
may become hot to the touch. If
installedproperly,thesetempera-
turesmeettherequirementofthe
national product standard. Fol-
low all minimum clearances
shown in this manual.

10
107067
UNVENTED NATURAL GAS LOG HEATER
CGS2718N, CGS3124N,
CLD3018NA, and CLD3924NTA
INSTALLING HEATER BASE
ASSEMBLY
IMPORTANT: Makesuretheheaterburners
arelevel.If heaterisnotlevel, heaterwillnot
workproperly.Forthermostatmodels,avoid
damage to thermostat bulb. Avoid nicks or
sharp bends in thermostat bulb wire. Keep
thermostat bulb in mounting bracket.
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
floor with noncombustible mate-
rial.Makesurematerial is 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.
INSTALLATION
Continued
INSTALLING DAMPER
CLAMP ACCESSORY FOR
VENTED OPERATION
Note: When used as a vented heater, appli-
ance must be installed only in a solid-fuel
burning fireplace with a working flue and
constructed of noncombustible material.
If your heater is a manually-controlled
model, you may use this heater as a vented
product. There are three reasons for operat-
ing your heater in the vented mode.
1. The fireplace does not meet the clear-
ance to combustibles requirements for
vent-free operation.
2. State or local codes do not permit vent-
free operation.
3. You prefer vented operation.
Ifreasonsnumber1or2aboveapplytoyou,
you must permanently open chimney flue
damper.Youmust installthedamper clamp
accessory (to order, see Accessories, page
30). This will insure vented operation (see
Figure 10). The damper clamp will keep
damper open. Installation instructions are
included with clamp accessory.
See chart below for minimum permanent
flue opening you must provide. Attach
damper clamp so the minimum permanent
flueopeningwill bemaintainedat alltimes.
Figure 10 - Attaching Damper Clamp
Damper
Clamp
Damper
Chimney Minimum Permanent
Height (ft.) Flue Opening (sq. ins.)
6' to 15' 39 sq. inches
15' to 30' 29 sq. inches
Area of Various Standard
Round Flues
Diameter (ins.) Area (sq. ins.)
5" 20 sq. inches
6" 29 sq. inches
7" 39 sq. inches
8" 51 sq. inches
Installation Items Needed
• hardwarepackage (provided withheater)
• approvedflexible gashose (notprovided)
(if allowed by local codes)
• sealant (resistant to propane/LP gas, not
provided)
• electric drill with 3/16" drill bit
• flathead screwdriver
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 11, page 11).
IMPORTANT: Hold gas regulatorwith
wrench when connecting flexible gas
hose.
2. Locate masonary screws in hardware
package.
3. Positionheaterbaseassemblyinfireplace.
4. Place logs in their proper position on
heater base (see Installing Logs, pages
13 and 14).
5. Center heater base and logs front-to-
back and side-to-side in fireplace.
6. Carefully remove logs without moving
heater base.
7. Mark screw locations through holes in
mountingbrackets (see Figure12, page
11). If installing in a brick-bottom fire-
place, mark screw locations in mortar
joint of bricks.
8. Remove heater base from fireplace.
Damper
Damper
Clamp
Damper
Manufactured FireplaceMasonry Fireplace
CAUTION:Do not removethe
metalDataPlatesattached to the
heater base assembly. The Data
Platescontainimportantwarranty
information.

11
107067
OWNER’S MANUAL
INSTALLATION
Continued
Heater Gas
Regulator
Flexible Gas Hose
(if allowed by local
codes)
Figure 11 - Attaching Flexible Gas Hose
to Heater Gas Regulator
Fitting
Figure 12 - Attaching Base Assembly to
Fireplace Floor
9. Drill holes at marked locations using
3/16" drill bit.
10. Attach base assembly to fireplace floor
usingtwo masonryscrews (inhardware
package) (see Figure 12).
Masonry
Screw
Mounting
Bracket
CAUTION: Avoid damage to
regulator.Holdgasregulatorwith
wrenchwhenconnectingittogas
piping and/or fittings.
Figure 13 - Gas Connection
* Purchase the optional CSA/AGA design-
certifiedequipmentshutoffvalvefromyour
dealer. See Accessories, page 30.
** Minimum inlet pressure for purpose of
input adjustment.
CONNECTING TO GAS
SUPPLY
WARNING: A qualified ser-
vicepersonmustconnectheater
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)
• equipment shutoff valve *
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
* An CSA/AGA design-certified equip-
ment shutoff valve with 1/8" NPT tap is an
acceptablealternative totest gaugeconnec-
tion. Purchase the optional CSA/AGA de-
sign-certifiedequipmentshutoffvalvefrom
your dealer. See Accessories, page 30.
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.
Installationmustincludeaequipmentshutoff
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).
CAUTION:Usepipejointseal-
ant that is resistant to liquid pe-
troleum (LP) gas.
We recommend that you install sediment
trap in supply line as shown in Figure 13.
Locate sediment trap where it is within
reach for cleaning. Install in piping system
betweenfuelsupplyandheater.Locatesedi-
menttrap where trappedmatter isnot likely
to freeze. A sediment trap traps moisture
and contaminants. This keeps them from
going into heater controls. If sediment trap
is not installed or is installed wrong, heater
may not run properly.
WARNING: Never connect
heater to private (non-utility) gas
wells. This gas is commonly
known as well-head gas.
Tee Joint Cap Pipe Nipple
3" Minimum
Sediment Trap
Gas
Regulator
From Gas
Meter (5"
W.C.** to
10.5" W.C.
Pressure)
CSA/AGA Design-Certified
Equipment Shutoff Valve With
1/8" NPT Tap*
Approved Flexible
Gas Hose (if
allowed by local
codes)
Continued
IMPORTANT: Install equipment shutoff
valve in an accessible location. The equip-
ment shutoff valve is for turning on or
shutting off the gas to the appliance.
Apply pipe joint sealant lightly to male
threads. This will prevent excess sealant
fromgoing intopipe. Excesssealant inpipe
could result in clogged heater valves.
WARNING: This appliance
requiresa1/2"NPT(NationalPipe
Thread) inlet connection to the
pressure regulator.

12
107067
UNVENTED NATURAL GAS LOG HEATER
CGS2718N, CGS3124N,
CLD3018NA, and CLD3924NTA
Figure 14 - Equipment Shutoff Valve
ON
POSITION
OFF
POSITION
Open
Closed
Equipment
Shutoff Valve
Figure 15 - Checking Gas Joints
Gas Meter
Equipment
Shutoff Valve Control Valve Location
INSTALLATION
Continued
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
Test Pressures In Excess Of 1/2 PSIG
(3.5 kPa)
1. Disconnect appliance with its appliance
maingasvalve(controlvalve)andequip-
ment shutoff valve from gas supply pip-
ingsystem.Pressuresinexcessof1/2psig
will damage heater regulator.
2. Cap off open end of gas pipe where
equipment shutoff valve was con-
nected.
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. Reconnect heater and equipment
shutoff valve to gas supply. Check re-
connected fittings for leaks.
Test Pressures Equal To or Less Than
1/2 PSIG (3.5 kPa)
1. Close equipmentshutoffvalve (seeFig-
ure 14).
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
equipment shutoff valve (see Figure
15). Apply mixture of liquid soap and
water to gas joints. Bubbles forming
show a leak.
4. Correct all leaks at once.
Pressure Testing Heater Gas
Connections
1. Open equipmentshutoffvalve (seeFig-
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 alljoints fromequipmentshutoff
valve to control valve (see Figure 15).
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 and 16 [manually-controlled
models] or pages 16 and 17 [thermo-
statically-controlled models]). Check
all other internal joints for leaks.
7. Turn off heater (see ToTurn Off Gas to
Appliance, page 16 [manually-con-
trolledmodels] orpage 17[thermostati-
cally-controlled models]).

13
107067
OWNER’S MANUAL
INSTALLATION
Continued
WARNING:Failuretoposition
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
numberswillhelpyouidentifythelogwhen
installing. It is very important to install
these 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 16).
2. Locate the notches on the back of the
front log (#2). Slide these notches over
thetabs ofthegratebase (seeFigure17).
3. Locate the notches in the bottom of the
crossover log (#3). Place the crossover
log on top of the back log and front log.
Make sure the notches of the crossover
log line up with rectangular knobs on
top of the back and front logs (see Fig-
ure 18).
4. Add lava rock around base of heater.
Do not place lava rock on logs or
burner.
INSTALLING LOGS ON
MODELS CGS2718N AND
CGS3124N
Figure 16 - Installing Back Log
Back Log (#1) Crossover
Log (#3)
Figure 18 - Installing Crossover Log
Figure 17 - Installing Front Log
Front Log
(#2)
Notch
Peg
Notch
Rectangular
Knob
Notch
Peg
Tabs of
Grate Base
Hole
Rectangular
Knob
CAUTION: After installation
andperiodicallythereafter,check
to ensure that no flame comes in
contact with any log. With the
heatersettoHigh,check toseeif
flames contact any log. If so, re-
position logs according to the
loginstallationinstructionsinthis
manual. Flames contacting logs
will create soot.
Continued

14
107067
UNVENTED NATURAL GAS LOG HEATER
CGS2718N, CGS3124N,
CLD3018NA, and CLD3924NTA
INSTALLING LOGS ON
MODELS CLD3018NA AND
CLD3924NTA
WARNING:Failuretoposition
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 is veryimportant toinstall these
logs exactly as instructed. Do not modify
logs. Only use logs supplied with heater.
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 fit over the burner (see Fig-
ure 19). 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 20).
3. Locate the notches in the bottom of the
front log (#3). Place the front log on
thegrate fingers.Make surethe notches
of the front log line up with the grate
fingers (see Figure 21).
INSTALLATION
Continued
Figure 19 - Installing Middle Log (#1)
Middle Log (#1)
Tab
Burner
“U” Bend
U-Shaped
Slot
Hole in
Grate Base
Back Log (#2)
Peg
Burner
Figure 20 - Installing Back Log (#2)
Crossover Log (#4)
Recess
Peg
Figure 22 - Installing Crossover Log (#4)
Front Log (#3)
Notches
Grate Fingers
Figure 21 - Installing Front Log (#3)
CAUTION: After installation
andperiodicallythereafter,check
to ensure that no flame comes in
contact with any log. With the
heatersettoHigh,check toseeif
flames contact any log. If so, re-
position logs according to the
loginstallationinstructionsinthis
manual. Flames contacting logs
will create soot.
4. Place crossover log (#4) onto the pin
(right) on back log (#2) and into the
recess of the middle log (#1) (see Fig-
ure 22).
5. Add lava rock around base of heater.
Do not place any lava rock on logs or
burner.

15
107067
OWNER’S MANUAL
Figure 24 - Pilot
WARNING: Do not operate
heater between PILOT and HIGH
positions.
WARNING: If you do not fol-
low these instructions exactly, a
fireorexplosionmayresultcaus-
ing property damage, personal
injury or loss of life.
A. Thisappliancehasa pilotwhichmust
belighted byhand.Whenlighting the
pilot,followtheseinstructionsexactly.
B. BEFORE LIGHTING smell all
aroundtheapplianceareaforgas.Be
suretosmellnext tothe floorbecause
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.
• Donottouchanyelectricswitch;do
notuse anyphonein yourbuilding.
• Immediatelycall yourgassupplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
• If you cannot reach your gas sup-
plier, call the fire department.
C. Useonlyyourhand topush inor turn
thegas controlknob. Neveruse tools.
If the knob will not push in or turn
by hand, don’t try to repair it, call a
qualified service technician or gas
supplier. Force or attempted repair
may result in a fire or explosion.
D. Do not use this appliance if any part
has been under water. Immediately
call a qualified service technician to
inspect the appliance and to replace
any part of the control system and
any gas control which has been un-
der water.
WARNING:
• If fireplace has glass doors,
never operate this heater with
glass doors closed. If you op-
erateheaterwithdoorsclosed,
heat buildup inside fireplace
will 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: Home owners 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.
Figure 23 - Control Knob and Ignitor But-
ton Location
PILOT
OFF
LO
HI
Control Knob
Ignitor Button
OPERATING
HEATER
FOR YOUR SAFETY
READ BEFORE
LIGHTING
LIGHTING
INSTRUCTIONS
1. STOP! Read the safety information
above.
2. Make sure equipment shutoff valve
is fully open.
3. Pressinandturncontrolknobclock-
wise
Clockwise
to the OFF position.
WARNING: Damper handle
will be hot if heater has been
running.
4. Wait five (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. If you don’t smell gas, go
to the next step.
5. Slightlydepressandturncontrolknob
counterclockwise
C-clockwise
to the PI-
LOTposition.Pressincontrolknobfor
five (5) seconds (see Figure 23).
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.
6. With control knob pressed in, press
and release ignitor button. This will
lightpilot.The pilotis attachedto the
burner. If needed, keep pressing ig-
nitor 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, page 16.
7. Keep control knob pressed in for 30
seconds after lighting pilot.After 30
seconds, release control knob.
Note: If pilot goes out, repeat steps
3 through 7.
• Ifcontrolknobdoesnotpopoutwhen
released, contact a qualified service
person or gas supplier for repairs.
8. Slightly depress and turn control
knob counterclockwise
C-clockwise
to
desired heating level. The burner
should light. Set control knob to any
heat level between HI and LO.
Manually-Controlled Models
Continued
Thermocouple Ignitor Electrode
Pilot Burner

16
107067
UNVENTED NATURAL GAS LOG HEATER
CGS2718N, CGS3124N,
CLD3018NA, and CLD3924NTA
Shutting Off Heater
1. Pressin andturncontrol knobclock-
wise
Clockwise
to the HIGH position.
2. Turncontrolknobclockwise
Clockwise
to the pilot position.
3. Pressin controlknobandturnclock-
wise
Clockwise
to the OFF position.
Shutting Off Burners Only (pilot
stays lit)
1. Turncontrolknobclockwise
Clockwise
to the HIGH position.
2. Pressin andturncontrol knobclock-
wise
Clockwise
to the pilot position.
CAUTION:Donottrytoadjust
heating levels by using the
manual shutoff valve.
The variable control valve can be set to
anyheatsettingandflameheightdesired,
by simply turning the control knob until
that setting is attained. Even the lowest
setting provides realistic, dancing yellow
flames.Selectinghighersettingsproduces
greater heat output. This results in in-
creased heating comfort.
OPERATING
HEATER
Continued
VARIABLE CONTROL
OPERATION
TO TURN OFF GAS
TO APPLIANCE
1. Followsteps1through 5under Light-
ing Instructions, page 15.
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 8 under Lighting Instruc-
tions, page 15.
MANUAL LIGHTING
PROCEDURE
Thermostatically-Controlled
Models
FOR YOUR SAFETY
READ BEFORE
LIGHTING
WARNING: If you do not fol-
low these instructions exactly, a
fireorexplosionmayresultcaus-
ing property damage, personal
injury or loss of life.
A. Thisappliancehasa pilotwhichmust
belighted byhand.Whenlighting the
pilot,followtheseinstructionsexactly.
B. BEFORE LIGHTING smell all
aroundtheapplianceareaforgas.Be
suretosmellnext tothe floorbecause
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.
• Donottouchanyelectricswitch;do
notuse anyphonein yourbuilding.
• Immediatelycall yourgas supplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
• If you cannot reach your gas sup-
plier, call the fire department.
C. Useonlyyourhand topush inor turn
thegas controlknob. Neveruse tools.
If the knob will not push in or turn
by hand, don’t try to repair it, call a
qualified service technician or gas
supplier. Force or attempted repair
may result in a fire or explosion.
D. Do not use this appliance if any part
has been under water. Immediately
call a qualified service technician to
inspect the appliance and to replace
any part of the control system and
any gas control which has been un-
der water.
1. STOP! Read the safety information
above.
2. Make sure equipment shutoff valve
is fully open.
3. Turncontrolknobclockwise
Clockwise
to the OFF position.
4. Wait five (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.
LIGHTING
INSTRUCTIONS
WARNING
• If fireplace has glass doors,
never operate this heater with
glass doors closed. If you op-
erateheaterwithdoorsclosed,
heat buildup inside fireplace
will 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.
Orangeflamewillalsobepresent.
Open damper or window to vent
smell. This will only last a few
hours.
Note: Home owners generally prefer to
operate their heater with the chimney
damper closed. This will put all the heat
into the room. However, there may be
timesyouwilldesirethe fullflamesof the
Hi heat setting but will find the heat
outputexcessive.You canopenthechim-
ney damper (if you have one) fully or
partially to release some of the heat.
WARNING: Damper handle
will be hot if heater has been
running.

17
107067
OWNER’S MANUAL
INSPECTING
BURNERS
Check pilot flame pattern and burner flame
patterns often.
PILOT FLAME PATTERN
Figure27showsacorrectpilotflamepattern.
Figure 28 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 28
• turn heater off (see To Turn Off Gas to
Appliance, page16 [manually-controlled
models] or column 2, this page [thermo-
stat-controlled models])
• seeTroubleshooting,pages 19 through 21
Figure 27 - Correct Pilot Flame Pattern
Figure 28 - Incorrect Pilot Flame Pattern
BURNER PRIMARY AIR
HOLES
Air is drawn into the burner through the
holes in the fitting at the entrance to the
burner. These holes may become blocked
with dust or lint. Periodically inspect these
holes for any blockage and clean as neces-
sary. Blocked air holes will create soot.
5. Turn control knob counterclockwise
C-clockwise
to the PILOT position.
Press in control knob for five (5) sec-
onds (see Figure 25).
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
for30 seconds orless.Thiswill allow
air to bleed from the gas system.
• Ifcontrolknobdoesnotpopoutwhen
released, contact a qualified service
person or gas supplier for repairs.
6. With control knob pressed in, press
and release ignitor button. This will
lightpilot.The pilotis attachedto the
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.
7. Keep control knob pressed in for 30
seconds after lighting pilot.After 30
seconds, release control knob.
Note: If pilot goes out, repeat steps
3 through 7.This heater has a safety
interlocksystem.Waitone (1)minute
for system toreset before lightingpi-
lot again.
8. Turn control knob counterclockwise
C-clockwise
to desired heating level. The
burners shouldlight.Setcontrolknob
to any heat level between HI and LO.
OPERATING
HEATER
Continued
CAUTION:Donottrytoadjust
heatinglevelsbyusingtheequip-
ment shutoff valve.
LO
HI
OFF
Pilot
Figure 25 - Control Knob and Ignitor But-
ton Location
Figure 26 - Pilot
Control Knob
Ignitor Button
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
Turn control knob clockwise
Clockwise
to
the OFF position.
Shutting Off Burners Only (pilot
stays lit)
Turn control knob clockwise
Clockwise
to
the PILOT position.
THERMOSTAT
CONTROL
OPERATION
(Thermostat-Controlled
Models Only)
Thethermostatcontrolknobcanbesetto
anycomfortlevelbetweenHiandLo.The
thermostat will gradually modulate the
heatoutputandflameheightfromhigher
to lower settings, or pilot, in order to
maintain the comfort level you select.
The ideal comfort setting will vary by
householddependingupontheamountof
space to be heated, the output of the
central heating system, etc.
Note: Selecting the Hi setting with the
control knob will cause the burner to
remainfullyon,withoutmodulatingdown
in most cases.
1. Followsteps1through 5under Light-
ing Instructions, pages 16 and 17.
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 8 under Lighting Instruc-
tions, column 1.
MANUAL LIGHTING
PROCEDURE
Thermocouple Ignitor Electrode
Pilot Burner
Thermocouple Pilot Burner
Thermocouple Pilot Burner

18
107067
UNVENTED NATURAL GAS LOG HEATER
CGS2718N, CGS3124N,
CLD3018NA, and CLD3924NTA
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,
bedding material, pet hair, etc.
LOGS
• If you remove logs for cleaning, refer to
Installing Logs, page 13 or 14, to prop-
erly replace logs.
• Replace log(s) if broken or chipped
(dime-sized or larger).
BURNER PRIMARY AIR
HOLES
Air is drawn into the burner through the 8
holes in the brass fitting at the entrance to
theburner.Theseholesmaybecomeblocked
with dust or lint. Periodically inspect these
holes for any blockage and clean as neces-
sary. 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. Allroundburnerflame 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. Allroundburnerflame 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.
INSPECTING
BURNERS
Continued
ODS/PILOT AND BURNER
• Use a vacuum cleaner or small, soft
bristled brush to clean.
CLEANING BURNER
INJECTOR HOLDER AND
PILOT AIR INLET HOLE
The primary air inlet holes allow the proper
amount of air to mix with the gas. This
provides a clean burning flame. Keep these
holesclearofdust,dirt,andlint.Cleanthese
air inlet holes prior to each heating season.
Blocked air holes will create soot. We rec-
ommendthatyou cleantheunit every2,500
hours of operation or every three months.
Wealsorecommendthatyoukeeptheburner
tubeandpilotassemblycleanandfreeofdust
anddirt. Tocleanthese partswerecommend
usingcompressed air nogreater than30 PSI.
Yourlocalcomputerstore,hardwarestore,or
home center may carry compressed air in a
can. You can use a vacuum cleaner in the
blow position. If using compressed air in a
can, please follow the directions on the can.
Ifyoudon'tfollowdirectionsonthecan, you
could damage the pilot assembly.
1. Shut off the unit, including the pilot.
Allow the unit to cool for at least thirty
minutes.
2. Inspect burner, pilot, and primary air
inlet holes on injector holder for dust
and dirt (see Figure 29).
3. Blow air through the ports/slots and
holes in the burner.
4. Check the injector holder located at the
end of the burner tube again. Remove
any large particles of dust, dirt, lint, or
pet hairs with a soft cloth or vacuum
cleaner nozzle.
5. Blow air into the primary air holes on
the injector holder.
6. In case any large clumps of dust have
now been pushed into the burner repeat
steps 3 and 4.
Clean the pilot assembly also. A yellow tip
on the pilot flame indicates dust and dirt in
the pilot assembly. There is a small pilot air
inlet hole about two inches from where the
pilot flame comes out of the pilot assembly
(see Figure 30). With the unit off, lightly
blowair throughthe airinlet hole.Youmay
blowthroughadrinkingstrawifcompressed
air is not available.
Figure 29 - Injector Holder On Outlet
Burner Tube
Burner
Tube
Primary Air Inlet
Holes (Shape of
Holes May Vary
by Model)
Figure 30 - Pilot Inlet Air Hole
Burner
Tube
Pilot Assembly
Pilot Air
Inlet Hole
Ports/Slots
Injector Holder
(May Be Brass or
Aluminum De-
pending on Model)

19
107067
OWNER’S MANUAL
TROUBLESHOOTING WARNING: Turn off and un-
plug heater and let cool before
servicing. Only a qualified ser-
vice person should service and
repair heater.
CAUTION: Never use a wire,
needle, or similar object to clean
ODS/pilot.ThiscandamageODS/
pilot unit.
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 equipment
shutoff valve closed
2. Control knob not in PILOT position
3. Control knob not pressed in while in
PILOT position
4. Air in gas lines when installed
5. ODS/pilot is clogged
6. Gas regulator setting is not correct
1. Control knob not fully pressed in
2. Control knobnot pressedin longenough
3. Equipment 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. Tightennut holdingpiezo 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 equipment
shutoff valve
2. Turn control knob to PILOT position
3. Press in control knob while in PILOT
position
4. Continue holding down control knob.
Repeat igniting operation until air is re-
moved
5. Clean ODS/pilot (see Cleaning and
Maintenance, page 18) or replace ODS/
pilot assembly
6. Replace gas regulator
1. Press in control knob fully
2. After ODS/pilot lights, keep control
knob pressed in 30 seconds
3. Fully open equipment shut-off valve
4. A) Contact local natural gas company
B) Clean ODS/pilot (see Cleaning and
Maintenance, page 18) 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
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Note: For additional help, visit DESA
International’stechnicalservicewebsite
at www.desatech.com.
Note: Alltroubleshootingitemsarelistedin
order of operation.
Continued

20
107067
UNVENTED NATURAL GAS LOG HEATER
CGS2718N, CGS3124N,
CLD3018NA, and CLD3924NTA
OBSERVED PROBLEM
Burner does light after ODS/pilot is lit
Delayed ignition burner
Burner backfiring during combustion
Slightsmoke orodorduring initialoperation
Moisture/condensationnoticedonwindows
Heater produces a whistling noise when
burner is lit
Whitepowderresidueformingwithinburner
box or on adjacent walls or furniture
REMEDY
1. Clean burner (see Cleaning and Mainte-
nance, page 18) or replace burner orifice
2. Contact local natural gas company
3. Replace burner orifice
1. Contact local natural gas company
2. Clean burner (see Cleaning and Mainte-
nance, page 18) or replace burner orifice
1. Clean burner (see Cleaning and Mainte-
nance, page 18) or replace burner orifice
2. Replace damaged burner
3. Replace gas regulator
1. Check burner for dirt and debris. If
found, clean burner (see Cleaning and
Maintenance, page 18)
2. Replace gas regulator
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 until airis 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 18) or replace burner orifice
1. Turn heater off when using furniture
polish, wax, carpet cleaners, or similar
products
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1. Burner orifice clogged
2. Inlet gas pressure is too low
3. Burner orifice diameter is too small
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,vapors fromfurniture pol-
ish, wax, carpet cleaners, etc. turn into
white powder residue
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