Page 1
DESA INTERNATIONAL
UNVENTED (VENT-FREE)
NATURAL GAS LOG HEATER
ALSO DESIGN-CERTIFIED AS A VENTED DECORATIVE APPLIANCE
OWNER’S OPERATION AND INSTALLATION MANUAL
"A" Model
CFS18NRA
VS18NRA
VS24NRA
VS30NRA
LO
O
L
T
I
P
O
N
F
F
O
HI
REMOTE
OFF
ON
18", 24", and 30"
Remote-Ready
®
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.
WARNING: Improper installation, adjustment, alteration, service, or maintenance
can cause injury or property damage.
Refer to this manual for correct installation and operational procedures. For
— Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
assistance or additional information
consult a qualified installer, service
agency, or the gas supplier.
— 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: This appliance is for installation only in a solid-fuel burning
masonry or UL127 factory-built fireplace, or in an approved ventless firebox. It is design-certified for these installations in accordance with ANS
Z21.11.2. Exception: Do not install this
appliance in a factory-built fireplace
that includes instructions stating it has
not been tested or should not be used
with 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. Refer to
Air for Combustion and Ventilation
section on page 4 of this manual.
This appliance may be installed in an aftermarket* manufactured (mobile) home, where not prohibited by
state or local codes.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
Save this manual for future reference
Page 2
DESA INTERNATIONAL
UNVENTED NATURAL GAS LOG HEATER
SAFETY
INFORMATION
WARNINGS
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, operate, or service this heater. Improper use of this heater can cause
serious injury or death from burns,
fire, explosion, electrical shock,
and carbon monoxide poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early
signs of carbon monoxide poisoning resemble the flu, with headaches, dizziness,
or nausea. If you have these signs, the heater
may not be working properly. Get fresh air
at once! Have heater serviced. Some people
are more affected by carbon monoxide than
others. These include pregnant women,
people with heart or lung disease or anemia,
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,
the odor added to the gas can fade. Gas may
be present even though no odor exists.
Make certain you read and understand all
Warnings. Keep this manual for reference.
It is your guide to safe and proper operation
of this heater.
WARNING: Any change to
this heater or its controls can be
dangerous.
1. This appliance is only for use with the
type of gas indicated on the rating plate.
This appliance is not convertible for use
with other gases.
2. If you smell gas
• shut off gas supply
• do not try to light any appliance
• do not touch any electrical switch; do
not use any phone in your building
• immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions
• if you cannot reach your gas supplier ,
call the fire department
3. This heater shall not be installed in a
bedroom or bathroom unless installed
as a vented appliance (see Installing
Damper Clamp Accessory for Vented
Operation, page 10).
4. Never install the heater
• in a recreational vehicle
• where curtains, furniture, clothing, or
other flammable objects are less than
42 inches from the front, top, or sides
of the heater
• in high traffic areas
• in windy or drafty areas
5. Before installing in a solid fuel burning fireplace, the chimney flue and firebox 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 operate this heater with glass doors closed.
If you operate heater with doors closed,
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.
7. You must operate this heater with a fireplace screen in place. Make sure fireplace
screen is closed before running heater.
8. This log heater is designed to be smokeless. If logs ever appear to smoke, turn
off heater and call a qualified service
person.
slight smoking may occur due to log
curing and heater burning manufacturing residues.
9. T o prevent the creation of soot, follow
the instructions in Cleaning and Main-
tenance, page 18.
10. Do not allow fans to blow directly into
the fireplace. Avoid any drafts that alter burner flame patterns. Ceiling fans
may create drafts that alter burner flame
patterns. Altered burner patterns can
cause sooting.
11. Before using furniture polish, wax, carpet cleaner, or similar products, turn
heater off. If heated, the vapors from
these products may create a white powder residue within burner box or on
adjacent walls or furniture.
Note:
During initial operation,
12. Do not use a blower insert, heat exchanger insert or other accessory not
approved for use with this heater.
13. This heater needs fresh, outside air ventilation to run properly . This heater has
an oxygen depletion sensor (ODS) pilot light safety system. The ODS shuts
down the heater if not enough fresh air
is available. See Air for Combustion
and Ventilation, pages 4 through 6. If
heater keeps shutting off, see Trouble-
shooting, pages 19 through 21.
14. Do not run heater
• where flammable liquids or vapors
are used or stored
• under dusty conditions
15. Do not use this heater to cook food or
burn paper or other objects.
16. Never place any objects on the heater.
17. 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 shutdown.
Allow surface to cool before touching.
18. Carefully supervise young children
when they are in the room with heater.
When using the hand-held remote accessory, keep selector switch in the
OFF position to prevent children from
turning on burners with hand-held remote control unit.
19. Do not use heater if any part has been
exposed to or under water. Immediately
call a qualified service technician to inspect the room heater and to replace any
part of the control system and any gas
control which has been under water.
20. Do not operate heater if any log is broken. Do not operate heater if a log is
chipped (dime-sized or larger).
21. Turn heater off and let cool before servicing, installing, or repairing. When using the hand-held remote accessory, make
sure the selector switch is in the OFF
position. Only a qualified service person
should install, service, or repair heater.
22. When using the hand-held remote accessory, make sure the selector switch is in
the OFF position when you are away
from home for long periods of time.
23. This heater must not be connected to
any external electrical source.
24. Operating heater above elevations of
4,500 feet may cause pilot outage.
2
104416
Page 3
OWNER’S MANUAL
PRODUCT
IDENTIFICATION
Front Log
Front
Burner
Piezo
Ignitor
Remote
Control
(Optional)
Figure 1 - VS24NR Shown
HI
TEMP
MAN
AUTO
ONLO
OFF
STATUS
Control Knob
Flame
Adjustment
Knob
Selector
Switch
(Optional)
Crossover Log
Rear Log
Base
Assembly
Rear
Burner
Middle
Log
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
both realistic flames and glowing coals.
This heater is designed for vent-free operation with flue damper closed. It has been
tested and approved to ANS Z21.11.2 standard for unvented heaters. State and local
codes in some areas prohibit the use of ventfree heaters. This heater may also be operated as a vented decorative (ANS Z21.60)
product by opening the flue damper (nonthermostat operation only).
SAFETY PILOT
This heater has a pilot with an Oxygen
Detection Safety Pilot System (ODS). The
ODS/pilot is a required feature for vent-free
room heaters. The ODS/pilot shuts off the
heater if there is not enough fresh air.
PIEZO IGNITION SYSTEM
This heater has a piezo ignitor. This system
requires no matches, batteries, or other
sources to light heater.
LOCAL CODES
Install and use heater with care. Follow all
local codes. In the absence of local codes, use
the latest edition of The National Fuel Gas
Code ANS Z223.1, also known as NFPA 54*.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
Note:
Where listed vented decorative logs
are required, thermostat operation is not
permitted.
104416
UNPACKING
CAUTION: Do not remove the
metal data plates attached to the
heater base assembly. The data
plates contain important warranty
information.
1. Remove logs and heater base assembly from carton.
heater base assembly by burners. This
could damage heater. Always handle
base assembly by grate.
2. Remove all protective packaging applied to logs and heater for shipment.
3. Check all items for any shipping damage. If damaged, promptly inform
dealer where you bought heater.
Note:
Do not pick up
3
OPTIONAL
REMOTE CONTROL
ACCESSORIES
There are four optional remote controls that
can be purchased separately for this log
heater:
• wall switch
• wall thermostat
• hand-held ON/OFF remote
• hand-held thermostat remote.
See Accessories, page 25.
The wall thermostat or hand-held thermo-
stat may not be used where vented decorative listing is required.
Page 4
DESA INTERNATIONAL
UNVENTED NATURAL GAS LOG HEATER
AIR FOR
COMBUSTION AND
VENTILATION
WARNING: This heater shall
not be installed in a confined space
or unusually tight construction
unless provisions are provided
for adequate combustion and ventilation air. Read the following instructions to insure proper fresh
air for this and other fuel-burning
appliances in your home.
Today’s homes are built more energy efficient than ever. New materials, increased
insulation, and new construction methods
help reduce heat loss in homes. Home owners
weather strip and caulk around windows and
doors to keep the cold air out and the warm air
in. During heating months, home owners
want their homes as airtight as possible.
While it is good to make your home energy
efficient, your home needs to breathe. Fresh
air must enter your home. All fuel-burning
appliances need fresh air for proper combustion and ventilation.
Exhaust fans, fireplaces, clothes dryers, and
fuel burning appliances draw air from the
house to operate. You must provide adequate fresh air for these appliances. This
will insure proper venting of vented fuelburning appliances.
PROVIDING ADEQUATE
VENTILATION
The following are excerpts from National
Fuel Gas Code. NFPA 54/ANS Z223.1, Section 5.3, Air for Combustion and Ventilation.
All spaces in homes fall into one of the three
following ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 4 through 6 will
help you classify your space and provide
adequate ventilation.
Unusually Tight Construction
The air that leaks around doors and windows may provide enough fresh air for
combustion and ventilation. However, in
buildings of unusually tight construction,
you must provide additional fresh air.
Unusually tight construction is defined as construction where:
a. walls and ceilings exposed to the
outside atmosphere have a continuous water vapor retarder with
a rating of one perm (6x10
per pa-sec-m2) or less with openings gasketed or sealed
b. weather stripping has been
added on openable windows and
doors
c. caulking or sealants are applied
to areas such as joints around
window and door frames, between sole plates and floors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical, and
gas lines, and at other openings.
If your home meets all of the three
criteria above, you must provide additional fresh air. See
From Outdoors
If your home does not meet all of the
three criteria above, proceed to
termining Fresh-Air Flow for Heater
Location
and
Ventilation Air
, page 6.
, page 5.
and
-11
kg
De-
Confined and Unconfined Space
The National Fuel Gas Code (ANS Z223.1,
1992 Section 5.3) defines a confined space
as a space whose volume is less than 50
cubic feet per 1,000 Btu per hour (4.8 m3 per
kw) of the aggregate input rating of all
appliances installed in that space and an
unconfined space as a space whose volume
is not less than 50 cubic feet per 1,000 Btu
per hour (4.8 m3 per kw) of the aggregate
input rating of all appliances installed in that
space. Rooms communicating directly with
the space in which the appliances are installed*, through openings not furnished
with doors, are considered a part of the
unconfined space.
This heater shall not be installed in a confined space or unusually tight construction
unless provisions are provided for adequate
combustion and ventilation air.
* Adjoining rooms are communicating only
if there are doorless passageways or ventilation grills between them.
4
104416
Page 5
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: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways or ventilation grills between
the rooms.
1. Determine the volume of the space (length x width x height).
Length x Width x Height = _________________ cu. ft. (volume of space)
Example:
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:
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:
The space in the above example is a confined space because the actual Btu/Hr used is more than the maximum Btu/Hr the space can support.
You must provide additional fresh air. Your options are as follows:
A. Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoin-
ing room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 6.
B. Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 6.
C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconfined.
If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an unconfined space. You will need no
additional fresh air ventilation.
Space size 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) = 2560 cu. ft. (volume of space)
2560 cu. ft. (volume of space) ÷ 50 cu. ft. = 51.2 or 51,200 (maximum Btu/Hr the space can support)
Example:
Gas water heater 40,000 Btu/Hr
Vent-free heater + 33,000 Btu/Hr
Total = 73,000 Btu/Hr
51,200 Btu/Hr (maximum the space can support)
73,000 Btu/Hr (actual amount of Btu/Hr used)
WARNING: If the area in which the heater may be operated is smaller than that defined as an unconfined space
or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of
the methods described in the
104416
National Fuel Gas Code, ANS Z223.1, 1992, Section 5.3
5
or applicable local codes
Continued
.
Page 6
DESA INTERNATIONAL
UNVENTED NATURAL GAS LOG HEATER
AIR FOR
COMBUSTION AND
VENTILATION
Continued
VENTILATION AIR
Ventilation Air From Inside
Building
This fresh air would come from an adjoining
unconfined space. When ventilating to an
adjoining unconfined space, you must provide two permanent openings: one within
12" of the ceiling and one within 12" of the
floor on the wall connecting the two spaces
(see options 1 and 2, Figure 2). You can also
remove door into adjoining room (see option 3, Figure 2). Follow the National Fuel
Gas Code NFPA 54/ANS Z223.1, Section
5.3, Air for Combustion and Ventilation for
required size of ventilation grills or ducts.
WARNING: Rework worksheet, adding the space of the
adjoining unconfined space. The
combined spaces must have
enough fresh air to supply all
appliances in both spaces.
Ventilation
Grills
Into Adjoining
Room,
Option 1
Figure 2 - Ventilation Air from Inside Building
Or
Remove
Door into
Adjoining
Room,
Option
3
Outlet
Air
12"
Ventilated
Attic
Ventilation Grills
Into Adjoining Room,
12"
Option 2
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or ducts. You must provide two permanent openings: one within 12" of the
ceiling and one within 12" of the floor.
Connect these items directly to the outdoors
or spaces open to the outdoors. These spaces
include attics and crawl spaces. Follow the
National Fuel Gas Code NFPA 54/ANS
Z223.1, Section 5.3, Air for Combustion and
Ventilation for required size of ventilation
grills or ducts.
IMPORTANT:
for inlet or outlet air into attic if attic has a
thermostat-controlled power vent. Heated air
entering the attic will activate the power vent.
Do not provide openings
Outlet
Air
Inlet
Air
Inlet Air
Figure 3 - Ventilation Air from Outdoors
To Attic
To
Crawl
Space
Ventilated
Crawl Space
6
104416
Page 7
OWNER’S MANUAL
INST ALLATION
NOTICE: This heater is intended
for use as supplemental heat. Use
this heater along with your primary heating system. Do not install this heater as your primary
heat source. If you have a central
heating system, you may run
system’s circulating blower while
using heater. This will help circulate the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
WARNING: A qualified service person must install heater.
Follow all local codes.
NOTICE: State or local codes may
only allow operation of this appliance in a vented configuration.
Check your state or local codes.
WARNING: Make sure the
selector switch is in the OFF position before installing heater.
WARNING: Before installing
in a solid fuel burning fireplace,
the chimney flue and firebox
must be cleaned of soot, creosote, ashes and loose paint by a
qualified chimney cleaner. Creosote will ignite if highly heated.
A dirty chimney flue may create
and distribute soot within the
house. Inspect chimney flue for
damage. If damaged, operate
heater with flue damper closed.
WARNING: Seal any fresh air
vents or ash clean-out doors located on floor or wall of fireplace.
If not, drafting may cause pilot
outage or sooting. Use a heatresistant sealant. Do not seal
chimney flue damper.
WARNING: Never install the
heater
• in a bedroom or bathroom un-
less installed as a vented appliance, see page 10.
• in a recreational vehicle
• where curtains, furniture,
clothing, or other flammable
objects are less than 42 inches
from the front, top, or sides of
the heater
• in high traffic areas
• in windy or drafty areas
CAUTION: This heater creates warm air currents. These
currents move heat to wall surfaces next to heater. Installing
heater next to vinyl or cloth wall
coverings or operating heater
where impurities (such as tobacco smoke, aromatic candles,
cleaning fluids, oil or kerosene
lamps, etc.) in the air exist, may
discolor walls.
IMPORTANT:
Vent-free heaters add moisture 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.
INSTALLATION AND
CLEARANCES
(Vent-Free Operation Only)
WARNING: Maintain the minimum clearances. If you can, provide greater clearances from
floor, ceiling, and adjoining wall.
MINIMUM FIREPLACE CLEARANCE
TO COMBUSTIBLE MATERIALS
Log Size Side Wall Ceiling Floor*
18" 24" 30" 16" 42" 5"
*See
Floor Clearances
LOG SIZING REQUIREMENTS
Minimum Firebox Size
Log Front Rear*
Size Height Depth Width Width
18" 17" 14" 20" 14"
24" 17" 14" 26" 18"
30" 17" 14" 32" 22"
*Measured at 14" depth
Carefully follow the instructions below. This
will ensure safe installation into a masonry,
UL127-listed manufactured fireplace, or
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. Clearances from the top of the fireplace
opening to the ceiling should not be less
than 42 inches.
16"
Left and
Right Sides
, page 9.
42"
104416
Figure 4 - Minimum Clearance to Wall and
Ceiling
Continued
7
Page 8
DESA INTERNATIONAL
UNVENTED NATURAL GAS LOG HEATER
INSTALLATION
Continued
NOTICE: Manual control heaters
may be used as a vented product.
If so, you must always run heater
with chimney flue damper open.
If running heater with damper
open, noncombustible material
above fireplace opening is not
needed. Go to
Clamp Accessory for Vented
Operation
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. Noncombustible
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.
If noncombustible material is less than 12",
you must install the fireplace hood accessory
(24" and 30" models only). See Figure 5 for
minimum clearances.
IMPORTANT:
minimum clearances, you must operate
heater with chimney flue damper open. Go
to Installing Damper Clamp Accessory for
Vented Operation, page 10.
Installing Damper
, page 10.
If you cannot meet these
If Using Mantel
You must have noncombustible material(s)
above the fireplace opening. Noncombustible 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 inches up. If
noncombustible material is less than 12",
you must install the fireplace hood accessory (24" and 30" models only). Even if
noncombustible material is more than 12",
you may need the hood accessory to deflect
heat away from your mantel shelf. See Figure 5, and Figures 6 and 7, page 9, for
minimum clearances.
Noncombustible
Material Distance (A) Requirements for Safe Installation
12" or more Noncombustible material OK.
Between 8" and 12" Install fireplace hood accessory (GA6050, GA6052,
or GA6053, see
Less than 8" Noncombustible material must be extended to at
least 8". See
IMPORTANT:
minimum clearances, you must operate
heater with chimney flue damper open. Go
to Installing Damper Clamp Accessory for
Vented Operation, page 10.
Accessories
Between 8" and 12"
If you cannot meet these
, page 25).
, above.
Heat Resistant
Material
(A)
Figure 5 - Heat Resistant Material (Slate, Marble, Tile, etc.) Above Fireplace
8
104416
Page 9
OWNER’S MANUAL
Hearth
5"
Min.
Combustible
Material
INSTALLATION
Continued
MANTEL CLEARANCES
In addition to meeting noncombustible material clearances, you must also meet required
clearances between fireplace opening and
mantel shelf. If you do not meet the clearances listed below, you will need a hood.
Determining Minimum Mantel
Clearances
If you meet minimum clearance between
mantel shelf and top of fireplace opening, a
hood is not required (see Figure 6).
Determining Minimum Mantel
Clearance When Using a Hood
If minimum clearances in Figure 6, are not
met, you must have a hood. When using a
hood there are still certain minimum mantel
clearances required. Follow minimum clearances shown in Figure 7, when using hood.
NOTICE: If your installation does
not meet the minimum clearances
shown, you must do one of the
following:
• operate the logs only with the
flue damper open
• raise the mantel to an acceptable height
• remove the mantel
Mantel Shelf
Minimum NonCombustible
Material
10"
8"
6"
1
2
/2
"
(A)
12"
8"
Minimum NonCombustible
Material Height
18"
14"
20"
16
Distances to
Underside of
Mantel
22"
3
/
"
18
4
1
/
"
2
Underside of
Mantel Shelf
24"
20"
Top of Fireplace
Opening
Figure 6 - Minimum Mantel Clearances Without Using Hood
Minimum NonCombustible
Material
12"
10"
8"
6"
2
1
"
/2
8"
Min.
12" 15" 18"
Underside of
Mantel Shelf
20"
All minimum
distances are
in inches
Log Set
24"/30" Models
18" Model
All minimum
distances are
in inches
Log Sets
18", 24",
& 30" Models
FLOOR CLEARANCES
A. If installing appliance on the floor level,
you must maintain the minimum distance of 14" to combustibles (see Figure 8).
B. If combustible materials are less than
14" to the fireplace, you must install
appliance at least 5" above the combustible flooring (see Figure 9).
104416
Hood
Hood
(GA6050, GA6052)
(GA6050, GA6052,
or GA6053)
Distances to
Underside of
Mantel
Figure 7 - Minimum Mantel Clearances When Using Hood
Combustible
14"
Min.
Figure 8 - Minimum Fireplace Clearances
If Installed at Floor Level
9
Material
Noncombustible
Material
Figure 9 - Minimum Fireplace Clearances
Above Combustible Flooring
Top of Fireplace
Opening
Continued
Page 10
DESA INTERNATIONAL
UNVENTED NATURAL GAS LOG HEATER
INSTALLATION
Continued
INSTALLING DAMPER
CLAMP ACCESSORY FOR
VENTED OPERATION
Note:
When used as a vented heater, appliance 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 operating 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.
If reasons number 1 or 2 above apply to you,
you must permanently open chimney flue
damper. You must install the damper clamp
accessory (to order, see Accessories, page
25). 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
flue opening will be maintained at all times.
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
Chimney Minimum Permanent
Height (ft.) Flue Opening (sq. ins.)
6' to 15' 39 sq. inches
15' to 30' 2.9 sq. inches
Damper Clamp
Damper
Masonry Fireplace
Figure 10 - Attaching Damper Clamp
Manufactured Fireplace
INSTALLING HEATER BASE
ASSEMBLY
CAUTION: Do not remove the
metal data plates attached to the
heater base assembly. The data
plates contain important warranty
information.
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.
WARNING: If installing in a
sunken fireplace, special care is
needed. You must raise the
fireplace floor to allow access to
heater control panel. This will
insure adequate air flow and
guard against sooting. Raise
fireplace floor with
noncombustible material. Make
sure material is secure.
CAUTION: Do not pick up
heater base assembly by burners. This could damage heater.
Only handle base assembly by
grates.
Damper
IMPORTANT:
ers are level. If heater is not level, heater will
not work properly.
Damper
Clamp
Damper
Make sure the heater burn-
Installation Items Needed
• hardware package (provided with heater)
• approved flexible gas hose (not provided)
(if allowed by local codes)
• sealant (resistant to propane/LP gas, not
provided)
• electric drill with 3/16" drill bit
Note:
Install optional GHRCT Receiver
and Hand-Held Remote Control Kit (see
Accessories, page 25) before installing gas
log heater. See installation instructions included with the kit.
1. Apply pipe joint sealant lightly to male
threads of gas fitting. Connect approved
flexible gas hose to inlet side of gas
control (see Figure 11, page 11).
2. Position heater base assembly in fire-
place.
3. Mark screw locations through holes in
front panel of base (see Figure 12, page
11). If installing in a brick-bottom fireplace, mark screw locations in mortar
joint of bricks.
4. Remove heater base from fireplace.
5. Drill holes at marked locations using
3/16" masonry drill bit.
10
104416
Page 11
OWNER’S MANUAL
INSTALLATION
Continued
6. Attach base to fireplace floor using
masonry screws (in hardware package).
7. Connect to gas supply. See Connect-
ing To Gas Supply.
Gas Control
Flexible Gas Hose
(if allowed by local
codes)
Figure 11 - Attaching Flexible Gas Hose
to Heater Gas Regulator
Masonry
Screw
Masonry
Screw
CONNECTING TO GAS
SUPPLY
NOTICE: A qualified service person must connect heater to gas
supply. Follow all local codes.
Installation Items Needed
Before installing heater, make sure you have
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
* An A.G.A. design-certified manual shutoff
valve with 1/8" NPT tap is an acceptable
alternative to test gauge connection. Purchase the optional A.G.A. design-certified
manual shutoff valve from your dealer. See
Accessories, page 25.
WARNING: Never connect
heater to private (non-utility) gas
wells. This gas is commonly
known as wellhead gas.
CAUTION: Use only new, black
iron or steel pipe. Internally-tinned
copper tubing may be used in
certain areas. Check your local
codes. Use pipe of 1/2" 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 13).
Apply pipe joint sealant lightly to male
threads. This will prevent excess sealant
from going into pipe. Excess sealant in
pipe could result in clogged heater valves.
We recommend that you install a sediment
trap in supply line as shown in Figure 13.
Locate sediment trap where it is within
reach for cleaning. Install in piping system
between fuel supply and heater. Locate
sediment trap where trapped matter is not
likely to freeze. A sediment trap traps
moisture and contaminants. This keeps
them from going into heater controls. If
sediment trap is not installed or is installed
wrong, heater may not run properly .
Figure 12 - Attaching Base to Fireplace
Floor
104416
CAUTION: Avoid damage to
gas control. Hold gas control with
wrench when connecting it to gas
piping and/or fittings.
A.G.A. Design-Certified Manual
From Gas Meter
(5" W.C.** to 10.5"
W.C. Pressure)
Tee
Joint
Pipe
Nipple
Sediment
Trap
Figure 13 - Gas Connection
Cap
3" Minimum
Shutoff Valve With 1/8" NPT Tap*
Approved Flexible Gas Hose
(if allowed by local codes)
Gas Control
* Purchase the optional A.G.A. design-certified manual shutof f valve from your dealer .
See Accessories, page 25.
** Minimum inlet pressure for purpose of input adjustment.
11
Continued
Page 12
DESA INTERNATIONAL
N
T
O
S
UNVENTED NATURAL GAS LOG HEATER
INSTALLATION
Continued
CHECKING GAS
CONNECTIONS
WARNING: Test all gas piping and connections for leaks
after installing or servicing. Correct all leaks at once.
WARNING: Never use an open
flame to check for a leak. Apply a
mixture of liquid soap and water
to all joints. Bubbles forming show
a leak. Correct all leaks at once.
Pressure Testing gas Supply
Piping system
Test Pressures In Excess Of 1/2 PSIG
1. Disconnect heater and its individual
manual shutoff valve from gas supply
piping system. Pressures in excess of
1/2 psig will damage heater regulator.
2. Cap off open end of gas pipe where
manual shutoff valve was connected.
3. Pressurize supply piping system by either 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 forming show a leak.
5. Correct all leaks at once.
6. Reconnect heater and manual shutoff
valve to gas supply. Check reconnected
fittings for leaks.
Test Pressures Equal To or Less Than
1/2 PSIG
1. Close manual shutoff valve (see Figure 14).
2. Pressurize supply piping system by either
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 15). Apply mixture of liquid soap and water to gas joints.
Bubbles forming show a leak.
4. Correct all leaks at once.
O
Open
POSI
Manual
Shutoff
Valve
PO
Closed
Figure 14 - Manual Shutoff Valve
Manual Shutoff Valve
Gas Meter
Figure 15 - Checking Gas Joints
Pressure Testing Heater Gas
Connections
1. Open manual shutoff valve (see Figure 14).
2. Open main gas valve located on or near
gas meter.
3. Make sure control knob of heater is in
the OFF position.
4. Check all joints from manual shutoff
valve to gas control (see Figure 15).
Apply mixture of liquid soap and water to gas joints. Bubbles forming show
a leak.
5. Correct all leaks at once.
6. Light heater (see Operating Heater,
pages 14 through 16). Check all other
internal joints for leaks.
7. Turn off heater (see To T urn Off Gas to
Appliance, page 15).
Gas Control
Location
12
104416
Page 13
OWNER’S MANUAL
4
4
INSTALLATION
Continued
INSTALLING LOGS
WARNING: Failure to position the parts in accordance with
these 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 very important to install
these logs exactly as instructed. Do not
modify logs. Only use logs supplied with
heater.
1. Place front log (#1) on top of the grate.
Make sure the notches in the bottom of
the log fits over the grate prongs (see
Figure 16). Push back of log flush with
metal grate bar.
2. Rest middle log (#2) behind metal posts
on front burner. Make sure the grooves
in the bottom of the log fit over the
grate. Bring the log forward next to the
metal posts. The cutout on the middle
log must be on top (see Figure 17).
3. Slide the grooves in the back of the rear
log (#3) against the rear grate prongs.
Make sure the peg on the log is on top
(see Figure 18).
4. Place the crossover log (#4) on the back
log and the middle log. Make sure the
peg on the rear log is in the hole in the
bottom of the crossover log. The crossover log should fit in the cutout of the
middle log (see Figure 19).
Front Log
Notch
Grate
Prongs
Metal Grate Bar
Figure 16- Installing Front Log (#1)
Groove
Metal Post
Figure 17 - Installing Middle Log (#2)
(#1)
Middle Log (#2)
Groove
Grate
Groove
in Back
of Log
Grate
Prong
Rear
Burner
Figure 18 - Installing Rear Log (#3)
Cutout
Figure 19 - Installing Crossover Log (#4)
Peg
Rear Log (#3)
Groove
in Back
of Log
Grate
Prong
Crossover
Log (#4)
Hole
Peg
104416
13
Page 14
DESA INTERNATIONAL
UNVENTED NATURAL GAS LOG HEATER
OPERATING
HEATER
FOR YOUR SAFETY
READ BEFORE
LIGHTING
WARNING: If you do not follow these instructions exactly, a
fire or explosion may result causing property damage, personal
injury or loss of life.
A. This appliance has a pilot which must
be lighted by hand. When lighting the
pilot, follow these instructions exactly .
B. BEFORE LIGHTING smell all
around the appliance area for gas. Be
sure to smell next to the floor because
some gas is heavier than air and will
settle on the floor.
WHAT TO DO IF YOU SMELL
GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do
not use any phone in your building.
• Immediately call y our gas supplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
C. Use only your hand to push in or tur n
the gas control knob. Ne ver use 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 under water.
LIGHTING
INSTRUCTIONS
WARNING
• If fireplace has glass doors,
never operate this heater with
glass doors closed. If you operate heater with doors closed,
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
with a fireplace screen in place.
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. 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
times you will desire the full flames of the
Hi heat setting but will find the heat
output excessive. You can open the chimney 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.
Control Knob
P
F
F
O
1. STOP! Read the safety information,
column 1.
2. Make sure manual shutoff valve is
fully open.
3. Set selector switch in the OFF position.
4. Press in and turn control knob clockwise to the OFF position (see
Figure 20).
WARNING: Burners will come
on automatically within one
minute when the selector switch
is in the ON position after the
pilot is lit.
5. Wait f ive (5) minutes to clear out any
gas. Then smell for gas, including
near the floor. If you smell gas,
STOP! Follow “B” in the safety information in column 1. If you don’t
smell gas, go to the next step.
6. Press in and turn control knob counterclockwise to the PILOT
position. Press in control knob for
five (5) seconds (see Figure 20).
Note:
You may be running this
heater for the first time after hooking up to gas supply. If so, the control knob may need to be pressed in
for 30 seconds or less. This will allo w
air to bleed from the gas system.
7. With control knob pressed in, press
and release ignitor button. This will
light pilot. The pilot is attached to the
front burner. If needed, keep pressing ignitor button until pilot lights.
Note:
If pilot does not stay lit, contact a qualified service person or gas
supplier for repairs. Until repair s are
made, light pilot with match. T o light
pilot with match, see Manual Light-
ing Procedure, page 15.
Flame
Adjustment
Knob
O
T
O
L
I
O
N
L
H
I
AUTO
OFF
ON
Ignitor Button
Figure 20 - Control Knob and Ignitor Button Location
14
Selector Switch in OFF Position
104416
Page 15
OWNER’S MANUAL
OPERATING
HEATER
Continued
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.
9. Slightly push in and turn control
knob counterclockwise to
the ON position.
10. Wait one minute and switch selector
switch to the ON position to light
burners.
tional when using GWMT1 or
GWMS2 optional accessories.
11. Set flame adjustment knob to any
level between HI and LO.
CAUTION: Do not try to adjust heating levels by using the
manual shutoff valve.
Note:
AUTO is only func-
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. T urn control knob clockwise
to the OFF position.
2a. Set selector switch in the OFF position.
2b. If Using Optional Hand-Held Re-
mote: Set selector switch in the OFF
position to keep from draining battery .
Shutting Off Burners Only (pilot
stays lit)
You may shut off the burners and keep
the pilot lit by doing one of the following:
1. T urn control knob clockwise
to the PILOT position.
2. Use remote control manual OFF
button.
3. Set selector switch in the OFF position.
MANUAL LIGHTING
PROCEDURE
1. Follow steps 1 through 6 under Lighting Instructions, page 14.
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 steps 9 through 12 under
Lighting Instructions, column 1.
WARNING: Make sure the
selector switch is in the OFF position when you are away from
home for long periods of time.
Heater will come on automatically with selector switch in the
ON position.
Pilot Burner
Figure 21 - Pilot
Ignitor Electrode
Continued
104416
15
Page 16
DESA INTERNATIONAL
UNVENTED NATURAL GAS LOG HEATER
OPERATING
HEATER
Continued
OPTIONAL REMOTE
OPERATION
Note:
All remote control accessories must
be purchased separately (see Accessories,
page 25). Follow instructions included
with the remote control.
Thermostat Control Operation
(Optional GHRCT Only) 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 automatically to maintain the
comfort level you select. The ideal comfort setting will vary by household depending upon the amount of space to be
heated, the output of the central heating
system, etc.
For wall thermostat operation, follow instruction supplied with thermostat accessory GWMT1. For wall switch operation follow instructions supplied with
GWMS2.
NOTICE: You must light the pilot
before using the remote control
unit. See
page 14.
Lighting Instructions
on
GHRC Operation:
2a. Press the ON/OFF b utton to turn the
burners on and off. When turning
burners off, the pilot will remain lit.
GHRCT Operation:
2. Select the MAN (manual) or AUTO
button on the hand-held remote control unit (see Figure 23).
• In manual mode, turn burners on
or off by pressing the ON or OFF
buttons on the hand-held remote
control unit.
• In auto mode, the room tempera-
ture is controlled by the thermostat in the hand-held remote control unit. To increase the room temperature, press the top arrow of the
TEMP button. To lower room the
temperature, press the bottom ar row of the TEMP b utton. At higher
settings the heater will run more.
IMPORTANT:
has been specially engineered to take
an air temperature sample every 5.5
This remote control
Control Knob in
On Position
N
O
O
F
F
T
O
P
I
L
minutes in the auto mode. It will not
respond immediately to the temperature setting being turned up or down.
IMPORT ANT :
The hand-held remote
control unit must be near the heater.
Do not keep the hand-held remote
control unit too close to the heater.
The thermostat on the hand-held remote control unit will heat up too
quickly and turn the heater off.
3. Use the ST A TUS button on the handheld remote control unit to see the
operation mode being used and the
temperature setting selected. A red
light will come on beside the operation mode being used when the status button is pressed.
4. To turn the burners off when operating in the manual mode, press the OFF
button. If operating in the auto mode,
press the MAN button, then press the
OFF button. The pilot will remain lit.
IMPORTANT:
To turn the pilot off,
manually turn the control knob on the
heater to the OFF position.
Flame Adjustment Knob
O
L
H
I
ON
OFF
REMOTE
1. After lighting, let pilot flame burn for
about one minute. Turn control knob
to ON position. Adjust flame adjustment knob anywhere between HI and
LO. Slide the selector switch to the
REMOTE position.
NOTE:
The burners may light if hand-held remote ON
button was on when selector switch
was last turned off. You can now turn
the burners on and off with the handheld remote control unit.
IMPORTANT:
Do not leave the selector switch in the REMOTE or ON
position when the pilot is not lit. This
will drain the battery.
IMPORTANT:
Be sure to press the
ON/OFF buttons on the hand held
remote control unit for up to 3 seconds to assure proper operation.
Selector Toggle Switch (Optional
Remote Control)
Figure 22 - Setting the Selector switch, Control Knob, and Flame Adjustment Knob for
Remote Operation
HI
Shows Temperature Setting
TEMP
Allows Burners to be Turned
On and Off with the HandHeld Remote Unit.
The Log Heater will
Automatically Cycle between
Pilot and the Heat Setting
that has been Selected
Figure 23 - Thermostat Hand-Held Remote Control Unit Selections (GHRCT Only)
16
LO
MAN ON
AUTO OFF
STATUS
Increases Room
Temperature
Decreases Room
Temperature
Turns Burners
On and Off
Shows Current
Operation Mode
104416
Page 17
OWNER’S MANUAL
INSPECTING
BURNERS
Check pilot flame pattern and burner flame
patterns often.
PILOT FLAME PATTERN
Figure 24 shows a correct pilot flame pattern. Figure 25 shows an incorrect pilot
flame pattern. The incorrect pilot flame is
not touching the thermocouple. This will
cause the thermocouple to cool. When the
thermocouple cools, the heater will shut
down.
If pilot flame pattern is incorrect, as shown
in Figure 25
• turn heater off (see To Turn Off Gas to
Appliance, page 15)
• see Troubleshooting, pages 19 through 21
Pilot Burner
Thermocouple
FRONT BURNER FLAME
PATTERN
Figure 26 shows correct front burner flame
pattern. Figure 27 shows incorrect front
burner flame pattern. The incorrect burner
flame pattern shows yellow tipping at top of
blue flame.
WARNING: If yellow tipping
occurs, your heater could produce increased levels of carbon
monoxide. If front burner flame
pattern shows yellow tipping, follow instructions at bottom of this
page. Yellow flame on rear burner
is normal.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles are burned
by heater, causing brief patches
of orange flame.
If front burner flame pattern is incorrect, as
shown in Figure 27
• turn heater off (see To Turn Off Gas to
Appliance, page 15)
• see Troubleshooting, pages 19 through 21
Figure 26 - Correct Front Burner Flame
Pattern
Yellow Tipping At Top
of Blue Flame
Figure 27 - Incorrect Front Burner Flame
Pattern
Figure 24 - Correct Pilot Flame Pattern
Pilot Burner
Figure 25 - Incorrect Pilot Flame Pattern
104416
Thermocouple
17
Page 18
DESA INTERNATIONAL
UNVENTED NATURAL GAS LOG HEATER
CLEANING AND
MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep
control areas, burners, and circulating air passageways of
heater clean. Inspect these areas
of heater before each use. Have
heater inspected yearly by a qualified service person. Heater may
need more frequent cleaning due
to excessive lint from carpeting,
bedding material, pet hair, etc.
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
holes clear of dust, dirt, and lint. Clean these
air inlet holes prior to each heating season.
Blocked air holes will create soot. We recommend that you clean the unit every 2,500
hours of operation or every three months.
We also recommend that you keep the burner
tube and pilot assembly clean and free of
dust and dirt. To clean these parts we recommend using compressed air no greater than
30 PSI. Your local computer store, hardware store, 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. If you don't follow directions on the can, 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 28).
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 29). With the unit off, lightly
blow air through the air inlet hole. You may
blow through a drinking straw if compressed
air is not available.
Injector Holder
Ports/Slots
Burner
Tube
Primary Air Inlet
Holes
Figure 28 - Injector Holder On Outlet
Burner Tube
Pilot Air Inlet
Hole
Pilot Assembly
Figure 29 - Pilot Inlet Air Hole
LOGS
• If you remove logs for cleaning, refer to
Installing Logs, page 13 , to properly replace logs.
• Replace log(s) if broken or chipped
(dime-sized or larger).
REPLACEMENT
PARTS
Note:
Use only original replacement parts.
This will protect your warranty coverage for
parts replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product.
If they can’t supply original replacement
part(s), call DESA International’s Technical Service Department at 1-800-323-5190.
When calling DESA International, have
ready
• your name
• your address
• model and serial numbers of your heater
• how heater was malfunctioning
• type of gas used (propane/LP or natural gas)
• purchase date
Usually, we will ask you to return the defec-
tive part to the factory.
PARTS NOT UNDER
WARRANTY
Contact authorized dealers of this product.
If they can’t supply original replacement
part(s), call DESA International’s Parts
Department at 1-800-972-7879 for referral
information.
When calling DESA International, have
ready
• model number of your heater
• the replacement part number
18
104416
Page 19
OWNER’S MANUAL
TROUBLESHOOTING
Note:
For additional help, visit DESA
International’s Technical Service web
site at www.desatech.com.
Note:
All troubleshooting items are listed in
order of operation.
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
WARNING: Turn off and unplug heater and let cool before
servicing. Only a qualified service person should service and
repair heater.
POSSIBLE CAUSE
1. Ignitor electrode not connected to ignitor cable
2. Ignitor cable pinched or wet
3. Piezo ignitor nut is loose
4. Broken ignitor cable
5. Bad piezo ignitor
6. Ignitor electrode positioned wrong
7. Ignitor electrode broken
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 control setting is not correct
CAUTION: Never use a wire,
needle, or similar object to clean
ODS/pilot. This can damage ODS/
pilot unit.
REMEDY
1. Reconnect ignitor cable
2. Free ignitor cable if pinched by any
metal or tubing. Keep ignitor cable dry
3. Tighten nut holding piezo ignitor to base
panel of log set. Nut is located behind
base panel
4. Replace ignitor cable
5. Replace piezo ignitor
6. Replace ignitor
7. Replace ignitor
1. Turn on gas supply or open manual
shutoff valve
2. Turn control knob to PILOT position
3. Press in control knob while in PILOT
position
4. Continue holding down control knob.
Repeat igniting operation until air is removed
5. Clean ODS/pilot (see Cleaning and
Maintenance, page 18) or replace ODS/
pilot assembly
6. Replace gas control
ODS/pilot lights but flame goes out when
control knob is released
104416
1. Control knob not fully pressed in
2. Control knob not pressed in long enough
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 problem 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 control valve
6. Thermocouple damaged
7. Gas control damaged
www.desatech.com
19
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 propane 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 gas control
Continued
Page 20
DESA INTERNATIONAL
UNVENTED NATURAL GAS LOG HEATER
TROUBLESHOOTING
Continued
OBSERVED PROBLEM
One or both burners do not light after ODS/
pilot is lit
Delayed ignition of one or both burners
Burner backfiring during combustion
Yellow flame in front burner during burner
combustion
POSSIBLE CAUSE
1. Inlet gas pressure is too low
2. Burner orifice(s) clogged
3. Mislocated crossover tube
4. Burner orifice(s) diameter is too small
5. Remote selector in OFF position
6. Wire disconnected from gas control
1. Manifold pressure is too low
2. Burner orifice(s) clogged
3. Mislocated crossover tube
1. Burner orifice is clogged or damaged
2. Damaged burner
3. Gas control defective
1. Not enough air
2. Gas control defective
REMEDY
1. Contact local natural gas company
2. Clean burner(s) (see Cleaning and Main-
tenance, page 18) or replace burner
orifice(s)
3. Contact qualified service person
4. Replace burner orifice(s)
5. Put remote selector in ON position
6. See Wir ing Dia gram, page 24
1. Contact local natural gas company
2. Clean burner(s) (see Cleaning and Main-
tenance, page 18) or replace burner
orifice(s)
3. Contact qualified service person
1. Clean burner (see Cleaning and Mainte-
nance, page 18) or replace burner orifice
2. Replace damaged burner
3. Replace gas control
1. Check burner(s) for dirt and debris. If
found, clean burner(s) (see Cleaning and
Maintenance, page 18)
2. Replace gas control
Slight smoke or odor during initial operation
Moisture/condensation noticed on windows
Heater produces a whistling noise when
burners are lit
White powder residue forming within burner
box or on adjacent walls or furniture
Remote does not function
1. Residues from manufacturing processes
and logs curing
1. Not enough combustion/ventilation air
1. Turning control knob to HI position
when burners are cold
2. Air in gas line
3. Air passageways on heater blocked
4. Dirty or partially clogged burner
orifice(s)
1. When heated, vapors from furniture polish, wax, carpet cleaners, etc. turn into
white powder residue
1. Battery is not install. Battery power is
low
www.desatech.com
1. 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. Operate burners until air is removed
from line. Have gas line checked by local natural gas company
3. Observe minimum installation clearances (see pages 7 through 9)
4. Clean burners (see Cleaning and Main-
tenance, page 18) or replace burner
orifice(s)
1. Turn heater off when using furniture
polish, wax, carpet cleaners, or similar
products
1. Replace 9-volt batteries in receiver and
remote control
20
104416
Page 21
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.
• 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.
OWNER’S MANUAL
IMPORTANT:
supplies, paint, paint remover, cigarette smoke, cements and glues, new carpet or textiles,
etc., create fumes. These fumes may mix with combustion air and create odors. These odors
will disappear over time.
Operating heater where impurities in air exist may create odors. Cleaning
OBSERVED PROBLEM
Heater produces a clicking/ticking noise
just after burners are 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
POSSIBLE CAUSE
1. Metal expanding while heating or contracting while cooling
1. Heater burning vapors from paint, hair
spray, glues, cleaners, chemicals, new
carpet, etc. (See
ment above)
2. Low fuel supply
3. Gas leak. See Warning statement
above
1. Not enough fresh air is available
2. Low line pressure
3. ODS/pilot is partially clogged
1. Gas leak. See Warning statement
above
2. Gas control defective
IMPORTANT
state-
REMEDY
1. This is common with most heaters. If
noise is excessive, contact qualified service person
1. Open window to ventilate room. Stop using odor causing products while heater
is running
2. Refill supply tank
3. Locate and correct all leaks (see Check-
ing Gas Connections, page 12)
1. Open window and/or door for ventilation
2. Contact local natural gas company
3. Clean ODS/pilot (see Cleaning and
Maintenance, page 18)
1. Locate and correct all leaks (see Check-
ing Gas Connections, page 12)
2. Replace gas control
Gas odor during combustion
Log set cycles to pilot, but room temperature drops to a lower than ideal level before
log set comes back on
104416
1. Foreign matter between control valve
and burner
2. Gas leak. See Warning statement
above
1. Hand-held remote control unit needs to
be moved away from heater
www.desatech.com
21
1. Take apart gas tubing and remove foreign matter
2. Locate and correct all leaks (see Check-
ing Gas Connections, page 12)
1. Move hand-held remote control unit farther away from the heater
Page 22
DESA INTERNATIONAL
UNVENTED NATURAL GAS LOG HEATER
ILLUSTRATED
PARTS
BREAKDOWN
VARIABLE CONTROL
CFS18NRA, VS18NRA
VS24NRA, VS30NRA
4
3
2
6
11
13
12
14
1
9-1
7
24
8
5
25
29
28
21
17
7
9
9-2
7
10
20
19
5
5
26
27
15
22
22
16
18
23
30
104416
Page 23
OWNER’S MANUAL
PARTS LIST
VARIABLE CONTROL
CFS18NRA, VS18NRA
VS24NRA, VS30NRA
KEY PART NUMBERS
NO.
1 104388-01 104388-02 104388-03 Front Log (#1) 1
2 104390-01 104390-02 104390-03 Middle Log (#2) 1
3 104392-01 104392-02 104392-03 Rear Log (#3) 1
4 104394-01 104394-02 104394-03 Crossover Log (#4) 1
5 M11084-26 M11084-26 M11084-26 Screw 6
6 103779-01 103779-01 103779-01 O.D.S. Pilot 1
7 098249-01 098249-01 098249-01 Nut 6
8 103780-01 103780-01 103780-01 Pilot Bracket 1
9 101330-01 101330-05 101330-06 Front Burner Assembly 1
9-1 101008-01 101008-01 101008-01 Crossover Burner Gasket 1
9-2 101007-01 101007-01 101007-01 Crossover Burner 1
10 100999-04 100999-05 100999-06 Rear Burner Assembly 1
11 103984-01 103984-02 103984-03 Base Assembly and Decal 1
12 098271-07 098271-06 098271-06 Ignitor Cable 1
13 102445-01 102445-01 102445-01 Piezo Ignitor 1
14 103588-01 103588-01 103588-01 Heat Shield 1
15 103782-01 103782-01 103782-01 Valve Bracket 1
16 M12461-26 M12461-26 M12461-26 Screw 5
17 103781-01 103781-01 103781-01 Gas Control 1
18 098264-02 098264-02 098264-02 Male Fitting 1
19 103784-02 103784-02 103784-02 Flame Adjustment Knob 1
20 103784-01 103784-01 103784-01 Control Knob 1
21 103587-01CK 103587-01CK 103587-01CK Switch Plate 1
22 M11084-26 M11084-26 M11084-26 Screw 2
23 099387-12 099387-12 099387-12 Pilot Tube 1
24 100609-01 100609-01 100609-01 Pilot Tube 1
25 101004-11 101004-11 101004-04 Rear Burner Injector 1
26 101004-11 101004-08 101004-08 Front Burner injector 1
27 103783-01 103783-01 103783-01 Remote Burner Tube 1
28 099998-01 099998-01 099998-01 Switch 1
29 103284-02 103284-02 103284-02 Wiring Harness 1
30 099918-02 099918-02 099918-02 Pilot Regulator 1
VS18NRA/CFS18NRA
This list contains replaceable parts used in your heater. When ordering parts, follow the
instructions listed under Replacement Parts on page18 of this manual.
VS24NRA VS30NRA DESCRIPTION QTY.
104416
PARTS AVAILABLE — NOT SHOWN
100563-01 100563-01 100563-01 Warning Plate 1
103877-01 103877-01 103877-01 Lighting Instructions Plate 1
100565-01 100565-01 100565-01 Warning Plate Fastener 1
100639-01 100639-01 100639-01 Caution Decal 1
101137-02 101137-02 101137-02 Hardware Kit 1
101416-38 101416-38 101416-38 Information Video 1
GA6060 GA6060 GA6060 Lava Rock 1
23
Page 24
DESA INTERNATIONAL
UNVENTED NATURAL GAS LOG HEATER
SPECIFICATIONS
18" Variable 24" Variable 30" Variable
Btu (Variable) 16,000/26,000 20,000/33,000 21,500/36,000
Type Gas Natural Gas Only Natural Gas Only Natural Gas Only
Ignition Piezo Piezo Piezo
Manifold Pressure 3.4" W.C. 3.4" W.C. 3.4" W.C.
Inlet Gas Pressure (in. of water)
Maximum 10.5" 10.5" 10.5"
Minimum* 5" 5" 5"
Shipping Weight 32 lbs. 34 lbs. 36 lbs.
* For purpose of input adjustment
WIRING DIAGRAM
AUTO
OFF
ON
TECHNICAL
SERVICE
You may have further questions about installation, operation, or troubleshooting. If
so, contact DESA International’s Technical
Service Department at 1-800-DESA LOG
(1-800-337-2564).
You can also visit DESA International’s
Technical Services web site at
www.desatech.com.
SERVICE HINTS
When Gas Pressure Is Too Low
• pilot will not stay lit
• burners will have delayed ignition
• heater will not produce specified heat
When Gas Quality Is Bad
• pilot will not stay lit
• burners will produce flames and soot
• heater will backfire when lit
You may feel your gas pressure is too low or
gas quality is bad. If so, contact your local
natural gas supplier.
24
Thermopile
104416
Page 25
OWNER’S MANUAL
ACCESSORIES
Purchase these heater accessories from your
local dealer. If they can not supply these
accessories, call DESA International’s Parts
Department at 1-800-972-7879 for referral
information. You can also write to the address listed on the back page of this manual.
MANUAL SHUTOFF
VALVE - GA5010
For all models. Manual shutoff valve with
1/8" NPT tap. Fits 1/2" NPT pipe.
HI
TEMP
MAN
AUTO
ONLO
OFF
STATUS
RECEIVER AND HAND-HELD
THERMOSTAT REMOTE
CONTROL KIT - GHRCT
For all models. Allows the gas log heater to
be operated in a manually or thermostatically controlled mode. You can turn the gas
log heater on and off without ever leaving
the comfort of your easy chair.
LAVA ROCK - GA6060
(Not Shown)
For all models. Order when additional rock
is desired. (3 lb. bag)
DAMPER CLAMP - GA6080
(Not Shown)
Permanently opens chimney flue damper
for vented operation. Can be used only with
non-thermostat accessories.
RECEIVER AND HAND-HELD
REMOTE CONTROL KIT
GHRC
For all models. Allows the gas log heater to
be turned on and off by using a hand-held
remote control.
WALL-MOUNT THERMOSTAT
SWITCH - GWMT1
(Not Shown)
For all models. The desired comfort setting
can be selected on the wall thermostat and
the log heater will automatically cycle from
pilot to the heat setting selected.
WALL-MOUNT ON/OFF
SWITCH - GWMS2
(Not Shown)
For all models. Allows the gas log heater to
be turned on and off with a wall switch.
FIREPLACE HOOD
Black - GA6050
Brass - GA6052
Antique Brass - GA6053
For all models. Helps deflect heat away
from mantel or wall above fireplace. Fits
openings 28" to 48" wide.
104416
25
Page 26
WARRANTY INFORMATION
KEEP THIS WARRANTY
Model
Serial No.
Date Purchased
Always specify model and serial numbers when communicating with the factory.
We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our standard written
warranty. We make no other warranty, expressed or implied.
LIMITED WARRANTY
VENT-FREE NATURAL GAS LOG HEATERS
DESA International warrants this product to be free from defects in materials and components for four (4) years and five (5) years on
stainless steel burners from the date of first purchase, provided that the product has been properly installed, operated and maintained
in accordance with all applicable instructions. There is no warranty on the batteries. To make a claim under this warranty the Bill of
Sale or cancelled check must be presented.
This warranty is extended only to the original retail purchaser. This warranty covers the cost of part(s) required to restore this heater
to proper operating condition and an allowance for labor when provided by a DESA Authorized Service Center. Warranty part(s) MUST
be obtained through authorized dealers of this product and/or DESA International who will provide original factory replacement parts.
Failure to use original factory replacement parts voids this warranty. The heater MUST be installed by a qualified installer in accordance
with all local codes and instructions furnished with the unit.
This warranty does not apply to parts that are not in original condition because of normal wear and tear, or parts that fail or become
damaged as a result of misuse, accidents, lack of proper maintenance or defects caused by improper installation. Travel, diagnostic cost,
labor, transportation and any and all such other costs related to repairing a defective heater will be the responsibility of the owner.
TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE SALE OF THE PRODUCT;
THIS EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EXPRESSED WARRANTIES AND LIMITS THE DURATION OF ANY AND ALL IMPLIED WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE TO FOUR (4) YEARS ON ALL COMPONENTS AND FIVE (5) YEARS ON STAINLESS STEEL
BURNERS FROM THE DATE OF FIRST PURCHASE; AND DESA INTERNATIONAL’S LIABILITY IS HEREBY LIMITED TO
THE PURCHASE PRICE OF THE PRODUCT AND DESA INTERNATIONAL SHALL NOT BE LIABLE FOR ANY OTHER
DAMAGES WHATSOEVER INCLUDING INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow a limitation on how long an implied warranty lasts or an exclusion or limitation of incidental or consequential
damages, so the above limitation on implied warranties, or exclusion or limitation on damages may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights that vary from state to state.
For information about this warranty write:
INTERNATIONAL
2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
www.desatech.com
104416 01
NOT A UPC
104416-01
Rev. F
11/99
Loading...