BLUE FLAME
VENT-FREE NATURAL GAS HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
®
18,000 and 28,000 Btu/Hr Thermostatically-Controlled Models
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.
— 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.
• Immediatelycallyourgassupplierfromaneighbor’sphone. Followthegas
supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
— Installation and service must be performed by a qualified installer, service
agency, or the gas supplier.
This appliance may be installed in an aftermarket* manufactured (mobile) home,
where not prohibited by state or local codes.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
This appliance is only for use with the type of gas indicated on the rating plate.
This appliance is not convertible for use with other gases.
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SAFETY
WARNINGS Continued
INFORMATION
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.
4. Never install the heater
• in a recreational vehicle
• where curtains, furniture, clothing, or other flammable objects are less than
36 inches from the front, top, or sides of the heater
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas
5. 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 5 through 8.
6. Keep all air openings in front and bottom of heater clear and free of debris.
This will insure enough air for proper combustion.
7. If heater shuts off, do not relight until you provide fresh, outside air. If heater
keeps shutting off, have it serviced.
8. Do not run heater
• where flammable liquids or vapors are used or stored
• under dusty conditions
9. Never place any objects on the heater.
10. Surface of heater becomes very hot 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.
11. Carefully supervise young children when they are in same room with heater.
12. Make sure grill guard is in place before running heater.
13. Do not use heater if any part has been under water. Immediately call a quali-
fied service technician to inspect the room heater and to replace any part of the
control system and any gas control which has been under water.
14. Turn off and unplug heater and let cool before servicing. Only a qualified
service person should service and repair heater.
15. Operating heater above elevations of 4,500 feet could cause pilot outage.
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Ignitor Button
Control Knob
PRODUCT
IDENTIFICATION
Grill
Guard
Glass
Panel
Front
Panel
Heater
Cabinet
Figure 1 - Vent-Free Natural Gas Heater
(Models VN2800BTB/CFN2800BTB Shown)
Install and use heater with care. Follow all local codes. In the absence of local
codes, use the latest edition of National Fuel Gas Code ANSI Z223.1, also known
as NFPA 54*.
LOCAL CODES
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
1. Remove heater from carton.
UNPACKING
2. Remove all protective packaging applied to heater for shipment.
3. Check heater for any shipping damage. If heater is damaged, promptly inform
dealer where you bought heater.
Safety Device
PRODUCT
FEATURES
This heater has a pilot with an Oxygen Depletion Sensor Shutoff 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.
Thermostatic Heat Control
This heater has a thermostat sensing bulb and a control valve. This results in the
greatest heater comfort. This can also result in lower gas bills.
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AIR FOR
COMBUSTION
AND
WARNING
WARNING ICON
G
001
This heater shall not be installed in a confined space 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.
VENTILATION
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 fuel-burning appliances.
PROVIDING ADEQUATE VENTILATION
The following is excerpts from National Fuel Gas Code. NFPA 54/ANSI 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 5 through 8 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 continu-
ous water vapor retarder with a rating of one perm 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, 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 addi-
tional fresh air. See Ventilation Air From Outdoors, page 8.
If your home does not meet all of the three criteria above, proceed to page 6.
Unconfined Space
The National Fuel Gas Code, ANSIZ223.1, 1992, Section 5.3 defines uncon-
fined space as having a minimum air volume of 50 cubic feet (127 cubic cm) for
each 1000 Btu/Hr input rating of all appliances in the space (cubic feet equals
length x width x height of space). Include adjoining rooms only if there are
doorless passageways or ventilation grills between the rooms.
Confined Space
The National Fuel Gas Code, ANSIZ223.1, 1992, Section 5.3 defines confined
space as having an air volume of less than 50 cubic feet (127 cubic cm) for each
1000 Btu/Hr input rating of all appliances in the space (cubic feet equals length
x width x height of space). Include adjoining rooms only if there are doorless
passageways or ventilation grills between the rooms.
Continued
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DETERMINING AIR FLOW FOR HEATER LOCATION
AIR FOR
COMBUSTION
AND
Determining if You Have a Confined or Unconfined Space
Use this worksheet 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.
VENTILATION
1. Determine the volume of the space (length x width x height).
Continued
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
Gas water heater*
Gas furnace
Vented gas heater
Gas fireplace logs
Other gas appliances*
Total
___________________ Btu/Hr
___________________ Btu/Hr
___________________ Btu/Hr
___________________ Btu/Hr
___________________ Btu/Hr
+ ___________________ Btu/Hr
= ___________________ Btu/Hr
Example: Gas water heater
Vent-free heater
Total
40,000
18,000
58,000
Btu/Hr
Btu/Hr
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)
58,000 Btu/Hr (actual amount of Btu/Hr used)
The space in the above example is a confined space because the actual Btu/Hr used is more
than the maximum Btu/Hr the space can support. You must provide additional fresh air.
Your options are as follows:
A. Rework worksheet, adding the space of an adjoining room. If the extra space provides
an unconfined space, remove door to adjoining room or add ventilation grills between
rooms. See Ventilation Air From Inside Building, page 7.
B. Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 8.
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.
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AIR FOR
COMBUSTION
AND
WARNING
If the area in which the heater may be operated is smaller than
that defined as an unconfined space, provide adequate combus-
tion and ventilation air by one of the methods described in the
National Fuel Gas Code, ANSI Z223.1, 1992, Section 5.3.
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/ANSI
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.
12"
Ventilation Grills
Into Adjoining Room,
Ventilation
Grills
Option 2
Or
into Adjoining
Room,
Remove
Door into
Adjoining
Room,
Option 1
Option 3
12"
Figure 2 - Ventilation Air from Inside Building
Continued
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Ventilation Air From Outdoors
AIR FOR
COMBUSTION
AND
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/ANSI Z223.1, Section 5.3, Air for Combustion and Ventilation for required size
of ventilation grills or ducts.
VENTILATION
Continued
IMPORTANT: Do not provide openings for inlet or outlet air into attic if attic has
a thermostat-controlled power vent. Heated air entering the attic will activate the
power vent.
Ventilated
Outlet
Attic
Air
Outlet
Air
To Attic
To
Crawl
Space
Inlet
Air
Ventilated
Inlet Air
Crawl Space
Figure 3 - Ventilation Air from Outdoors
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INSTALLINGTO
WALL
NOTICE
Aqualifiedservicepersonmustinstallheater. Followalllocalcodes.
CHECK GAS TYPE
Use only natural gas. If your gas supply is not natural, do not install heater. Call
dealer where you bought heater for proper type heater.
INSTALLATION ITEMS
Before installing heater, make sure you have the items listed below:
• piping (check local codes)
• sealant (resistant to propane/LP gas) • test gauge connection *
• manual shutoff valve *
• ground joint union
• sediment trap
• tee joint
(see Figure 13, page 15) • pipe wrench
*AnA.G.A. design-certifiedmanualshutoffvalvewith1/8"NPTtapisanacceptable
alternative to test gauge connection. Purchase the optional A.G.A. design-certified
manual shutoff valve from your dealer. See Accessories, page 30.
LOCATING HEATER
This heater is designed to be mounted on a wall.
WARNING
WARNING ICON
G
001
Maintain the minimum clearances shown in Figure 4 (page 10). If you
can, provide greater clearances from floor, ceiling, and joining wall.
You can locate heater on floor, away from a wall. An optional floor mounting
stand is needed. Purchase the floor mounting stand from your dealer. See Accesso-
ries, page 30.
WARNING
WARNING ICON
G
001
Never install the heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture, clothing, or other flammable objects
are less than 36 inches from the front, top, or sides of the heater
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas
CAUTION
This heater 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 in the air
(such as tobacco smoke) exist, may discolor walls.
IMPORTANT: Vent-free heaters add moisture to the air. Although this is beneficial, in-
stalling heater in rooms without enough ventilation air may cause mildew to form from
too much moisture. See Air for Combustion and Ventilation, pages 5 through 8.
CAUTION
WARNING ICON
G
001
If you install the heater in a home garage
• heater pilot and burner must be at least 18 inches above floor
• locate heater where moving vehicle will not hit it
Continued
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For convenience and efficiency, install heater
• where there is easy access for operation, inspection, and service
• in coldest part of room
INSTALLINGTO
WALL
An optional fan kit is available from your dealer. See Accessories, page 30. If
planning to use fan, locate heater near an electrical outlet.
Continued
CEILING
36"
Minimum
6"
Minimum
From
Sides Of
Heater
Left
Side
Right
Side
3"
Minimum To Top Surface
Of Carpeting, Tile Or Other
Combustible Material
FLOOR
Figure 4 - Mounting Clearances As Viewed From Front of Heater
THERMOSTAT SENSING BULB
The thermostat sensing bulb has been placed inside the heater for protection during
shipping.
Locating Thermostat Sensing Bulb
1. Remove front panel of heater (see Figure 7, page 11).
2. Locate thermostat sensing bulb just under burner assembly.
IMPORTANT: Attach thermostat sensing bulb to back of heater for proper operation.
Attaching Thermostat Sensing Bulb
1. Remove thermostat sensing bulb from holders inside heater. Route through slot
opening in bottom of heater.
2. Place clamp on thermostat sensing bulb as shown in Figure 5. Clamp is provided
in hardware package.
3. Snap clamp into upper mounting hole as shown in Figure 5. Mounting hole is
located on lower left edge on back of heater. Make sure the thermostat sensing
bulb is pointing up.
Thermostat
Sensing Bulb
Clamp
Figure 5 - Attaching Thermostat Sensing Bulb
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INSTALLING HEATER TO WALL
INSTALLINGTO
WALL
Mounting Bracket
The mounting bracket is located on back panel of heater. It has been taped there for
shipping. Remove mounting bracket from back panel.
Continued
Mounting
Bracket
Figure 6 - Mounting Bracket
Removing Front Panel Of Heater
1. Remove two screws near bottom corners of front panel.
2. Lift straight up on grill guard until it stops. Grill guard will slide up about 1/4".
3. Pull bottom of front panel forward, then down.
4. Remove cardboard packing from grill and glass.
Figure 7 - Removing Front Panel Of Heater
Methods For Attaching Mounting Bracket To Wall
Only use last hole on each end of mounting bracket to attach bracket to wall. These
two holes are 16 inches apart from their centers. Attach mounting bracket to wall in
one of two ways.
1. Attaching to wall stud
2. Attaching to wall anchor
Attaching to wall stud This method provides the strongest hold. Insert mounting
screws through mounting bracket and into wall studs.
Attaching to wall anchor This method allows you to attach mounting bracket to
hollow walls (wall areas between studs) or to solid walls (concrete or masonry).
Decide which method better suits your needs. Either method will provide a secure
hold for the mounting bracket.
Continued
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Marking Screw Locations
1. Tape mounting bracket to wall where heater will be located. Make sure mount-
ing bracket is level.
INSTALLINGTO
WALL
Continued
WARNING
Maintain minimum clearances shown in Figure 8. If you can,
provide greater clearances from floor and joining wall.
2. Mark screw locations on wall (see Figure 8).
Note: Only mark last hole on each end of mounting bracket. Insert mounting
screws through these holes only.
3. Remove tape and mounting bracket from wall.
11"
Min.
7 1/4"
Min.
16"
16"
Only Insert Mounting
Screws Through Last
Hole On Each End
Only Insert Mounting
Screws Through Last
Hole On Each End
18 3/4"
Min.
18 3/4"
Min.
AjdoingWal
AjdoingWal
Floor
Floor
Model VN2800BTB and
CFN2800BTB
Models VN2000BTB and
CFN2000BTB
Figure 8 - Mounting Bracket Clearances
Attaching Mounting Bracket To Wall
Note: Wall anchors, mounting screws, and spacers are in hardware package. The
hardware package is provided with heater.
Attaching to wall stud method
For attaching mounting bracket to wall studs
1. Drill holes at marked locations using 9/64" drill bit.
2. Place mounting bracket onto wall. Line up last hole on each end of bracket with
holes drilled in wall.
3. Insert mounting screws through bracket and into wall studs.
4. Tighten screws until mounting bracket is firmly fastened to wall studs.
Attaching to wall anchor method
For attaching mounting bracket to hollow walls (wall areas between studs) or solid
walls (concrete or masonry)
1. Drill holes at marked locations using 5/16" drill bit. For solid walls (concrete or
masonry), drill at least 1" deep.
2. Fold wall anchor as shown in Figure 9.
Figure 9 - Folding Anchor
3. Insert wall anchor (wings first) into hole. Tap anchor flush to wall.
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4. For thin walls (1/2" or less), insert red key into wall anchor. Push red key to
“pop” open anchor wings. IMPORTANT: Do not hammer key!
INSTALLINGTO
WALL
For thick walls (over 1/2" thick) or solid walls, do not pop open wings.
Continued
Figure 10 - Popping Open Anchor Wings For Thin Walls
5. Place mounting bracket onto wall. Line up last hole on each end of bracket with
wall anchors.
6. Insert mounting screws through bracket and into wall anchors.
7. Tighten screws until mounting bracket is firmly fastened to wall.
Placing Heater On Mounting Bracket
1. Locate two horizontal slots on back panel of heater.
2. Place heater onto mounting bracket. Slide horizontal slots onto stand-out tabs on
mounting bracket.
Horizontal Slots
Stand-Out Tab
Mounting Bracket
(attached to wall)
Figure 11 - Mounting Heater Onto Mounting Bracket
Installing Bottom Mounting Screws
1. Locate two bottom mounting holes. These holes are near bottom on back panel
of heater (see Figure 12).
2. Mark screw locations on wall.
3. Remove heater from mounting bracket.
4. If installing bottom mounting screws into hollow or solid wall, install wall anchors.
Follow steps 1 through 4 under Attaching To Wall Anchor Method, page 12.
If installing bottom mounting screw into wall stud, drill holes at marked loca-
tions using 9/64" drill bit.
5. Replace heater onto mounting bracket.
6. Place spacers between bottom mounting holes and wall anchor or drilled hole.
7. Hold spacer in place with one hand. With other hand, insert mounting screw
through bottom mounting hole and spacer. Place tip of screw in opening of wall
anchor or drilled hole.
8. Tighten both screws until heater is firmly secured to wall. Do not over tighten.
Note: Do not replace front panel at this time. Replace front panel after making
gas connections and checking for leaks. (see pages 14-16)
Figure 12 - Installing Bottom Mounting Screws
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CONNECTING
TO GAS
NOTICE
A qualified service person must connect heater to gas supply.
Follow all local codes.
SUPPLY
WARNING
Never connect heater to private (non-utility) gas well. This gas is
commonly known as wellhead gas.
IMPORTANT: Check gas line pressure before connecting heater to gas line. Gas line
pressure must be no greater than 14 inches of water. If gas line pressure is higher,
heater regulator damage could occur.
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 large enough diameter to allow proper gas volume to heater.
If pipe is too small, undue loss of pressure will occur.
Typical Pipe Diameters
VN2000BTB/CFN2000BTB
VN2800BTB/CFN2800BTB
3/8" or greater
1/2" or greater
Installation must include a manual shutoff valve, union, and plugged 1/8" NPT tap.
Locate NPT tap within reach for test gauge hook up. NPT tap must be upstream
from heater (see Figure 13, page 15).
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.
CAUTION
Use pipe joint sealant that is resistant to natural gas.
Install sediment trap in supply line as shown in Figure 13, page 15. Locate sediment
trap where it is within reach for cleaning. 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.
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IMPORTANT: Hold pressure regulator with wrench when connecting it to gas piping
and/or fittings.
CONNECTING
TO GAS
Note: Burner bracket
not shown for clarity
Pressure
Regulator
SUPPLY
Continued
1/2" NPT
Pipe Nipple
Heater
Cabinet
Ground Joint
Union
Tee Joint
Manual Shutoff
Valve *
Test
Gauge
Connection *
Reducer
Bushing to
1/8" NPT
From Gas Meter
(4" W.C. to 10.5" W.C.
Pressure)
1/8" NPT
Plug Tap
Tee Joint
Sediment
Trap
Pipe
Nipple
3" Minimum
Cap
Figure 13 - Gas Connection
* An A.G.A. design certified manual shutoff valve with 1/8" NPT tap is an accept-
able alternative to test gauge connection. Purchase the optional A.G.A. design
certified manual shutoff valve from your dealer. See Accessories, page 30.
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.
Continued
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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.
CHECKING
GAS
CONNECTIONS
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.
Continued
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.
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 thermostat gas valve (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 17 through 19). Check all other
internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to Appliance, page 19).
8. Replace front panel.
Open
Manual
Shutoff
Valve
Closed
Figure 14 - Manual Shutoff Valve
Thermostat Gas Valve
Gas Meter
Manual
Shutoff
Valve
16
Figure 15 - Checking Gas Joints
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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 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.
C. Use only your hand to push in or turn the gas control knob. Never use
tools. If the knob will not push in or turn by hand, don’t try to repair it,
call 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
1. STOP! Read the safety information above.
2. Make sure manual shutoff valve is fully open.
3. Turn control knob clockwise
to the OFF position.
Clockwise
Control Knob
Ignitor Button
LO
P I L O T
O F F
H I
IGNITOR
Figure 16 - Control Knob In The OFF Position
Continued 17
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4. Wait five (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
at the top of page 17. If you don’t smell gas, go to the next step.
OPERATING
HEATER
Continued
C-clockwise
5. Turn control knob counterclockwise
to the PILOT position. Press
in control knob for five (5) seconds (see Figure 16).
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. This will allow air to bleed from the gas system.
• If control knob does not pop up when released, contact a qualified
service person or gas supplier for repairs.
6. With control knob pressed in, push down and release ignitor button. This
will light pilot. The pilot is attached to the front of burner. The pilot can be
seen through the glass panel. If needed, keep pressing ignitor button until
pilot lights.
Note: If pilot does not stay lit, refer to Troubleshooting, pages 22 through
25. Also contact a qualified service person or gas supplier for repairs.
Until repairs are made, light pilot with match. To light pilot with match,
see Manual Lighting Procedure, page 19.
Ignitor Electrode
Pilot Burner
Thermocouple
Figure 17 - Pilot
7. Keep control knob pressed in for 30 seconds after lighting pilot. After 30
seconds, release control knob.
• If control knob does not pop up when released, contact a qualified
service person or gas supplier for repairs.
Note: If pilot goes out, repeat steps 3 through 7. This heater has a safety
interlock system. Wait one (1) minute before lighting pilot again.
C-clockwise
8. Turn control knob counterclockwise
to desired heating level. The
main burner should light. Set control knob to any heat level between HI
and LO.
CAUTION
Do not try to adjust heating levels by using the manual shutoff valve.
18
101809
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OPERATING
TO TURN OFF GAS TO APPLIANCE
HEATER
Continued
Shutting Off Heater
1. Turn control knob clockwise
to the OFF position.
Clockwise
2. Turn off all electric power to the appliance if service is to be performed.
Shutting Off Burner Only (pilot stays lit)
1. Turn control knob clockwise
to the PILOT position.
Clockwise
THERMOSTAT CONTROL OPERATION
The thermostatic control used on these models differs from standard thermo-
stats. Standard thermostats simply turn on and off the burner. The thermostat
used on this heater senses the room temperature. The thermostat adjusts the
amount of gas flow to the burner. This increases or decreases the burner flame
height. At times the room may exceed the set temperature. If so, the burner
will shut off. The burner will cycle back on when room temperature drops
below the set temperature. The control knob can be set to any heat level
between HI and LO. Selecting the HI setting will cause the burner to remain
fully on without modulating down in most cases.
Note: The thermostat sensing bulb measures the temperature of air near the
heater cabinet. This may not always agree with room temperature (depending
on housing construction, installation location, room size, open air tempera-
tures, etc.). Frequent use of your heater will let you determine your own
comfort levels.
MANUAL LIGHTING PROCEDURE
1. Remove front panel (see Figure 7, page 11).
2. Follow steps 1 through 5 under Lighting Instructions, pages 17 and 18.
3. With control knob pressed in, strike match. Hold match to pilot until pilot
lights.
4. Keep control knob pressed in for 30 seconds after lighting pilot. After 30
seconds, release control knob.
5. Replace front panel.
19
101809
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Check pilot flame pattern and burner flame pattern often.
INSPECTING
BURNER
PILOT FLAME PATTERN
Figure 18 shows a correct pilot flame pattern. Figure 19 shows an incorrect pilot
flame pattern. The incorrect pilot flame is not touching the thermocouple. This will
cause the thermocouple to cool. When the thermocouple cools, the heater will shut
down.
Pilot Burner
Thermocouple
Figure 18 - Correct Pilot Flame Pattern
Thermocouple
Pilot Burner
Figure 19 - Incorrect Pilot Flame Pattern
If pilot flame pattern is incorrect, as shown in Figure 19
• turn heater off (see To Turn Off Gas to Appliance, page 19).
• see Troubleshooting, pages 22 through 25.
20
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BURNER FLAME PATTERN
INSPECTING
BURNER
Figure 20 shows a correct burner flame pattern. Figure 21 shows an incorrect
burner flame pattern. The incorrect burner flame pattern shows yellow tipping of
the flame. It also shows the flame higher than 1/2 the glass panel height.
Continued
WARNING
If yellow tipping occurs, your heater could produce increased
levels of carbon monoxide. If burner flame pattern shows yellow
tipping, follow instructions at bottom of this page.
NOTICE
Do not mistake orange flames with yellow tipping. Dirt or other fine
particles enter the heater and burn causing brief patches of orange
flame.
1/2 GLASS HEIGHT
CORRECT FLAME PATTERN
AT HIGH POSITION
Figure 20 - Correct Burner Flame Pattern
Yellow
Tipping
1/2 GLASS HEIGHT
INCORRECT FLAME PATTERN
AT HIGH POSITION
Figure 21 - Incorrect Burner Flame Pattern
If burner flame pattern is incorrect, as shown in Figure 21
• turn heater off (see To Turn Off Gas to Appliance, page 19).
• see Troubleshooting, pages 22 through 25.
21
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CLEANING
AND
WARNING
Turn off heater and let cool before cleaning.
MAINTENANCE
CAUTION
You must keep control areas, burner, 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, etc.
ODS/PILOT AND BURNER
• Use a vacuum cleaner, pressurized air, or small, soft bristled brush to clean.
CABINET
Air Passageways
• Use a vacuum cleaner or pressurized air to clean.
Exterior
• Use a soft cloth dampened with a mild soap and water mixture. Wipe the
cabinet to remove dust.
TROUBLE-
SHOOTING
WARNING
Turn off and unplug heater and let cool before servicing. Only a
qualified service person should service and repair heater.
Note: All troubleshooting
items are listed in order of
operation.
CAUTION
Never use a wire, needle, or similar object to clean ODS/pilot. This
can damage ODS/pilot unit.
OBSERVED
PROBLEM
POSSIBLE
CAUSE
REMEDY
When ignitor button
is pressed, there is no
spark at ODS/pilot
1. Ignitor electrode posi-
tioned wrong
2. Ignitor electrode broken
1. Replace ignitor
2. Replace ignitor
3. Ignitor electrode not con- 3. Reconnect ignitor cable
nected to ignitor cable
4. Ignitor cable pinched or
wet
4. Free ignitor cable if
pinched by any metal or
tubing. Keep ignitor cable
dry
5. Piezo ignitor nut is loose 5. Tighten nut holding piezo
ignitor to heater cabinet.
Nut is located inside
heater cabinet at top
6. Broken ignitor cable
7. Bad piezo ignitor
6. Replace ignitor cable
7. Replace piezo ignitor
22
101809
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OBSERVED
PROBLEM
POSSIBLE
CAUSE
TROUBLE-
REMEDY
SHOOTING
When ignitor button
is pressed, there is
spark at ODS/pilot
but no ignition
1. Gas supply turned off
or manual shutoff
valve closed
2. Control knob not in
PILOT position
1. Turn on gas supply or
open manual shutoff
valve
2. Turn control knob to
PILOT position
Continued
3. Control knob not
pressed in while in
PILOT position
3. Press in control knob
while in PILOT
position
4. Air in gas lines when
installed
4. Continue holding down
control knob. Repeat
igniting operation until
air is removed
5. ODS/pilot is clogged
5. Clean ODS/pilot (see
Cleaning and Mainte-
nance, page 22) or
replace ODS/pilot
assembly
6. Gas regulator setting is
not correct
6. Replace gas regulator
ODS/pilot lights but
flame goes out when
control knob is
released
1. Control knob not fully
pressed in
2. Control knob not
pressed in long enough
1. Press in control knob
fully
2. After ODS/pilot lights,
keep control knob
pressed in 30 seconds
3. Wait one minute for
safety interlock system
to reset. Repeat
3. Safety interlock system
has been triggered
ignition operation
4. Fully open manual
shut-off valve
4. Manual shutoff valve
not fully open
5. Thermocouple connec-
tion loose at control
valve
5. Hand tighten until
snug, then tighten 1/4
turn more
6. Pilot flame not touch-
ing thermocouple,
which allows thermo-
couple to cool, causing
pilot flame to go out.
This problem could be
caused by one or both
of the following:
6. A) Contact local
natural gas company
B) Clean ODS/pilot
(see Cleaning and
Maintenance, page
22) or replace ODS/
pilot assembly
A) Low gas pressure
B) Dirty or partially
clogged ODS/pilot
7. Thermocouple dam-
aged
7. Replace thermocouple
8. Control valve damaged
8. Replace control valve
Continued
23
101809
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OBSERVED
PROBLEM
POSSIBLE
CAUSE
TROUBLE-
REMEDY
SHOOTING
Burner does not light
after ODS/pilot is lit
1. Burner orifice is
clogged
1. Clean burner (see
Cleaning and Mainte-
nance, page 22) or
Continued
replace burner orifice
2. Burner orifice diameter 2. Replace burner orifice
is too small
3. Inlet gas pressure is
too low
3. Contact local natural gas
company
Delayed ignition of
burner
1. Manifold pressure is
too low
1. Contact local natural gas
company
2. Burner orifice is
clogged
2. Clean burner (see
Cleaning and Mainte-
nance, page 22) or
replace burner orifice
Burner backfiring
during combustion
1. Burner orifice is
clogged or damaged
1. Clean burner (see
Cleaning and Mainte-
nance, page 22) or
replace burner orifice
2. Replace burner
2. Burner damaged
3. Gas regulator defective
3. Replace gas regulator
Yellow flame during
burner combustion
1. Not enough air
1. Check burner for dirt
and debris. If found,
clean burner (see
Cleaning and Mainte-
nance, page 22)
2. Gas regulator defective
2. Replace gas regulator
Slight smoke or odor
during initial opera-
tion
1. Residues from manu-
facturing processes
1. Problem will stop after a
few hours of operation
Heater produces a
whistling noise when
burner is lit
1. Turning control knob
to HI position when
burner is cold
1. Turn control knob to LO
position and let warm up
for a minute
2. Air in gas line
2. Operate burner until air
is removed from line.
Have gas line checked
by local natural gas
company
3. Air passageways on
heater blocked
3. Observe minimum
installation clearances
(see Figure 4, page 10)
4. Clean burner (see
Cleaning and Mainte-
nance, page 22) or
4. Dirty or partially
clogged burner orifice
replace burner orifice
24
101809
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TROUBLE-
WARNING
If you smell gas
SHOOTING
• Shut off gas supply.
Continued
• Do not try to light any appliance.
• Donottouchanyelectricalswitch;donotuse
any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• Ifyoucannotreachyourgassupplier, callthe
fire department.
IMPORTANT: Operating heater where impurities in air exist may create odors. Cleaning
supplies, paint, paint remover, cigarette smoke, cements and glues, new carpet or
textiles, etc., create fumes. These fumes may mix with combustion air and create odors.
OBSERVED
PROBLEM
POSSIBLE
CAUSE
REMEDY
Heater produces a
clicking/ticking noise
just after burner is lit
or shut off
1. Metal expanding while
heating or contracting
while cooling
1. This is common with
most heaters. If noise is
excessive, contact
qualified service person
Heater produces
unwanted odors
1. Heater burning vapors
from paint, hair spray,
glues, etc. (see IMPOR-
TANT statement above).
2. Gas leak. See Warn-
ing statement at
1. Ventilate room. Stop
using odor causing
products while heater is
running
2. Locate and correct all
leaks (see Checking Gas
Connections, page 15)
top of page.
Heater shuts off in
use (ODS operates)
1. Not enough fresh air is
available
2. Low line pressure
1. Open window and/or
door for ventilation
2. Contact local natural
gas company
3. ODS/pilot is partially
clogged.
3. Clean ODS/pilot (see
Cleaning and Mainte-
nance, page 22)
Gas odor even when
control knob is in
OFF position
1. Gas leak. See Warn-
ing statement at
1. Locate and correct all
leaks (see Checking Gas
Connections, page 15)
top of page.
2. Control valve defective
2. Replace control valve
Gas odor during
combustion
1. Foreign matter be-
tween control valve
and burner
1. Take apart gas tubing
and remove foreign
matter
2. Gas leak. See Warn-
ing statement at
top of page.
2. Locate and correct all
leaks (see Checking Gas
Connections, page 15)
1. Refer to Air for Com-
bustion and Ventilation
requirements (page 5)
Moisture/condensa-
tion noticed on
windows
1. Not enough combus-
tion/ventilation air
25
101809
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You may have further questions about installation, operation, or troubleshooting.
If so, contact DESA International’s Technical Service Department at 1-800-323-5190.
TECHNICAL
SERVICE
VN2000BTB
CFN2000BTB
VN2800BTB
CFN2800BTB
SPECIFICATIONS
Btu (Variable)
Type Gas
9,000/18,000
Natural Only
Piezo
14,000/28,000
Natural Only
Piezo
Ignition
Pressure Regulator Setting
3" W.C.
3" W.C.
Inlet Gas Pressure (in. of water)
Maximum
7"
5"
7"
5"
Minimum
Dimensions, Inches (H x W x D)
Heater (Includes knobs & grill) 23.5 x 18.5 x 8.0
23.5 x 25.9 x 8.0
25.8 x 28.7 x 10.1
Carton
25.8 x 21.3 x 10.1
Weight (pounds)
Heater
22
27
30
35
Shipping
When gas pressure is too low
SERVICE
HINTS
• pilot will not stay lit
• burner will have delayed ignition
• heater will not produce specified heat
When gas quality is bad
• pilot will not stay lit
• burner will produce flames and soot
• heater will backfire when lit
You may feel your gas pressure is too low or gas quality is bad. If so, contact your
local natural gas supplier.
26
101809
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You can purchase service manual from the address listed on the back page of this
manual. Send a check for $5.00 payable to DESA International.
SERVICE
PUBLICATIONS
Note: Use only original replacement parts. This will protect your warranty cover-
age for parts replaced under warranty.
REPLACEMENT
PARTS
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 number of your heater
• how heater was malfunctioning
• type of gas used (propane or natural gas)
• purchase date
Usually, we will ask you to return the defective 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
27
101809
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28
101809
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This list contains replaceable parts used in your heater. When ordering parts, follow
the instructions listed under Replacement Parts on page 27 of this manual.
PARTS LIST
KEY
PART NUMBER FOR
NO.
1
2
3
4
5
6
7
8
VN2000BTB
098304-01
098742-13
098197-03
101108-01
098533-01AA
098260-01
098532-01AA
M11084-26
098352-01BR
098271-03
098249-01
099440-05
CFN2000BTB VN2800BTB
CFN2800BTB DESCRIPTION
QTY.
2
1
1
2
1
1
1
4
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
098304-01
098742-17
098197-03
101108-01
098304-01
098742-14
098197-04
101108-01
098304-01
098742-18
098197-04
101108-01
Screw, #10 x 3/8"
Front Panel
Grill Guard
Clip, Grill Guard
098533-01AA 098533-02AA
098260-01 098260-02
098532-01AA 098532-02AA
M11084-26 M11084-26
098352-01BR 098352-02BR
098533-02AA Bottom Glass Retainer
098260-02 Glass Panel
098532-02AA Top Glass Retainer
M11084-26 Screw, #10 x 3/8"
098352-02BR Deflector Unit
9
10
11
12
098271-03
098249-01
099440-05
098514-01
098515-01
099120-02
099387-03
098251-02
098250-01
098867-04
099553-01
098518-01
098297-03
098264-02
098276-01
098277-01
098265-01
098275-01
098522-03
098530-01
102445-01
M11084-26
M11084-38
099066-01
098271-03
098249-01
099440-05
098514-01
098515-01
099126-02
099387-03
098251-04
098250-01
098867-04
099553-01
098518-01
098297-03
098264-02
098276-01
098277-01
098265-01
098275-01
098522-04
098531-01
102445-01
M11084-26
M11084-38
099066-01
098271-03
098249-01
099440-05
098514-01
098515-01
099126-02
099387-03
098251-04
098250-01
098867-04
099553-01
098518-01
098297-03
098264-02
098276-01
098277-01
098265-01
098275-01
098522-04
098531-01
102445-01
M11084-26
M11084-38
099066-01
Ignitor Cable
Nut, M5
ODS/Pilot Assembly
Thermocouple
Ignitor Electrode
Burner
3/16" Pilot Tubing
Injector
Injector Holder
Pressure Regulator
Pilot Shield
3/8" Outlet (Burner) Tubing
3/8" Inlet Tubing
3/8" NPT Male Connector
1/8" NPT Plug
12-1 098514-01
12-2 098515-01
13
099120-02
099387-03
098251-02
098250-01
098867-04
099553-01
098518-01
098297-03
098264-02
098276-01
098277-01
098265-01
098275-01
098522-03
098530-01
102445-01
M11084-26
M11084-38
099066-01
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
3/8" to 1/8" NPT Bushing
3/8" NPT Male Elbow
3/8" NPT Plug
Thermostat Gas Valve
Cabinet
Piezo Ignitor
Screw, #10 x 3/8"
Screw, #8 x 3/8"
Mounting Bracket
PARTS AVAILABLE — NOT SHOWN
098305-01
100642-01
098305-01
100642-01
098305-01
100642-01
098305-01
100642-01
Control Position Label
Hardware Assembly
1
1
29
101809
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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.
ACCESSORIES
FAN KITS - GA3100A, and GA3200TA
For all models. Provides better heat distribu-
tion. Makes heater more efficient. Complete
installation and operating instructions
included.
Manually controlled - GA3100A. Includes
ON/OFF switch.
Thermostatically controlled - GA32000TA.
Includes three settings: ON/OFF/AUTO.
FLOOR MOUNTING STAND
Model VN2000BTB - GA4000B
Model VN2800BTB - GA4010B
For locating heater on the floor, away
from a wall. Complete installation
instructions included.
MANUAL SHUTOFF
VALVE - GA5010
For all models. Manual shutoff valve
with 1/8" NPT tap.
30
101809
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NOTES
_________________________________________________________________
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_________________________________________________________________
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_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
31
101809
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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 RESIDENTIAL GAS HEATERS
DESA International warrants this product to be free from defects in materials and components for three (3) years and
five (5) years on stainless steel burners from the date of first purchase, provided that the product has been properly
installed,operatedandmaintainedinaccordancewithallapplicableinstructions.Tomakeaclaimunderthiswarranty
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 THREE (3)
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 DAM-
AGES.
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:
101809-01
REV. C
4/96
2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
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