Desa LSF20NT Original instructions

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WARNING: If the information in this manual is not fol-
lowed 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.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
— Installation and service must be performed by a quali-
fied installer, service agency or the gas supplier.
UNVENTED (VENT-FREE) SOLAR FUSION GAS HEATER
SAFETY INFORMATION AND INSTALLATION MANUAL
RESIDENTIAL MODELS
SF20NT, SF20PT,
LSF20NT, LSF20PT,
VSF20NT, VSF20PT,
SF30NT, SF30PT,
LSF30NT, LSF30PT,
VSF30NT, VSF30PT
GARAGE MODELS
LSFG20NT, LSFG20PT,
REM20NT, REM20PT,
SFG20NT, SFG20PT,
SPC20NT, SPC20PT,
VSFG20NT, VSFG20PT

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2
WARNING: Improper installation, adjustment, altera-
tion, service or maintenance can cause injury or prop-
erty damage. Refer to this manual for correct installation
and operational procedures. For assistance or addi-
tional information consult a qualified installer, service
agency or the gas supplier.
WARNING: This is an unvented gas-fired heater. It uses
air (oxygen) from the room in which it is installed. Provi-
sions for adequate combustion and ventilation air must
be provided. Refer to Air for Combustion and Ventilation
section on page 5 of this manual.
This appliance may be installed in an aftermarket,* per-
manently located, manufactured (mobile) home, where
not prohibited by local codes.
This appliance is only for use with the type of gas indi-
cated on the rating plate. This appliance is not convert-
ible for use with other gases.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
State of Massachusetts: The installation must be made by a licensed plumber or gas fitter in the
Commonwealth of Massachusetts.
Sellers of unvented propane or natural gas-fired supplemental room heaters shall provide to each
purchaser a copy of 527 CMR 30 upon sale of the unit.
Vent-free gas products are prohibited for bedroom and bathroom installation in the Common-
wealth of Massachusetts.
TABLE OF CONTENTS
Safety Information ............................................... 3
Local Codes ........................................................ 4
Product Identification ........................................... 4
Unpacking ........................................................... 4
Product Features ................................................. 4
Air For Combustion and Ventilation ..................... 5
Installation ........................................................... 7
Operating Heater ............................................... 12
Inspecting Heater .............................................. 14
Cleaning and Maintenance ................................ 15
Troubleshooting ................................................. 16
Technical Service .............................................. 19
Service Publications .......................................... 19
Service Hints ..................................................... 19
Specifications .................................................... 20
Accessories ....................................................... 21
Replacement Parts ............................................ 21
Parts Central ..................................................... 21
Illustrated Parts Breakdown and Parts List ....... 22
Warranty Information ......................................... 24

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SAFETY INFORMATION
WARNING: This product con-
tains and/or generates chemicals
known to the State of California
to cause cancer or birth defects
or other reproductive harm.
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 head-
aches, 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 influ-
ence of alcohol and those at high altitudes.
Natural and Propane/LP Gas: Natural and Propane/
LP gases are odorless. An odor-making agent is
added to these gases. 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 warn-
ings. 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.
WARNING: Do not use a
blower insert, heat exchanger
insert or other accessory not ap-
proved for use with this heater.
Due to high temperatures, the
appliance should be located out
of traffic and away from furniture
and draperies.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the heater.
Surface of heater becomes very
hot when running heater. Keep
children and adults away from
hot surface to avoid burns or
clothing ignition. Heater will
remain hot for a time after shut-
down. Allow surface to cool
before touching.
Carefully supervise young chil-
dren when they are in the same
room with heater.
Make sure grill guard is in place
before running heater.
Keep the appliance area clear
and free from combustible ma-
terials, gasoline and other flam-
mable vapors and liquids.
1. This appliance is only for use with the type
of gas indicated on the rating plate. This ap-
pliance is not convertible for use with other
gases.
2. Do not place propane/LP supply tank(s) in-
side any structure. Locate propane/LP supply
tank(s) outdoors.
3. This heater shall not be installed in a bedroom
or bathroom.
4. 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
neighborʼs phone. Follow the gas supplierʼs
instructions
• If you cannot reach your gas supplier, call
the fire department

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4
5. This heater needs fresh, outside air ventilation
to run properly. This heater has an Oxygen
Depletion Sensing (ODS) safety shutoff
system. The ODS shuts down the heater if
not enough fresh air is available. See Air for
Combustion and Ventilation, page 5.
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. Do not use heater if any part has been 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.
10. Turn off and unplug (if using electricity)
heater and let cool before servicing. Only a
qualified service person should service and
repair heater.
11. Operating heater above elevations of 4,500
feet (1,371 m) could cause pilot outage.
12. To prevent performance problems, do not use
propane/LP fuel tank of less than 100 lbs. (45 kg)
capacity.
13. 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.
14. Provide adequate clearances around air
openings.
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, ANSI Z223.1/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
SAFETY INFORMATION
Continued
Figure 1 - Vent-Free Gas Heater
Control Knob &
Ignitor Button
(inside door)
Front Panel
Grill
Guard
UNPACKING
1. Remove heater, front panel and grill from
carton. Set aside in a safe location.
2. Carefully remove refractory from heater and
remove packing material. Check refractory
for any damage. If the refractory is damaged
do not use. See Replacement Parts, page 21.
Set aside in a safe location.
3. Check heater for any damage. If heater is dam-
aged, promptly return to where you bought
heater.
PRODUCT FEATURES
SAFETY DEVICE
This heater has a pilot with an Oxygen Deple-
tion Sensing (ODS) safety shutoff system. The
ODS/pilot is a required feature for vent-free room
heaters. The ODS/pilot shuts off the heater if there
is not enough fresh air.
IGNITION SYSTEM
This heater has either a piezo ignitor or electronic
ignitor to light heater fuel supply.
THERMOSTATIC HEAT CONTROL
Thermostat models have a thermostat sensing
bulb and a control valve. This results in the great-
est heater comfort. This can also result in lower
gas bills.
PRODUCT
IDENTIFICATION

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AIR FOR COMBUSTION
AND VENTILATION
WARNING: This heater shall
not be installed in a confined
space or unusually tight con-
struction unless provisions are
provided for adequate combus-
tion and ventilation air. Read the
following instructions to insure
proper fresh air for this and
other fuel-burning appliances
in your home.
Todayʼs 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 effi-
cient, 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 are excerpts from National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Section 5.3,
Air for Combustion and Ventilation.
All spaces in homes fall into one of the three fol-
lowing ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 5 through 7 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 out-
side atmosphere have a continuous
water vapor retarder with a rating of
one perm (6 x 10-11 kg per pa-sec-m2) or
less with openings 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 these three cri-
teria, you must provide additional fresh
air. See Ventilation Air From Outdoors,
page 7.
If your home does not meet all of the three
criteria above, proceed to Determining
Fresh-Air Flow For Heater Location.
Confined and Unconfined Space
The National Fuel Gas Code, ANSI Z223.1/NFPA
54 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 com-
municating directly with the space in which the
appliances are installed*, through openings not
furnished with doors, are considered a part of the
unconfined space.
* Adjoining rooms are communicating only if
there are doorless passageways or ventilation grills
between them.
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 pas-
sageways or ventilation grills between the rooms.

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1. Determine the volume of the space (length x
width x height).
Length x Width x Height =__________cu. ft.
(volume of space)
Example: Space size 20 ft. (6.1 m) (length) x
16 ft. (4.88 m) (width) x 8 ft. (2.44 m) (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. Multiply the space volume by 20 to determine
the maximum Btu/Hr the space can support.
__________ (volume of space) x 20 = (Maxi-
mum Btu/Hr the space can support)
Example: 2560 cu. ft. (72.4 m3) (volume of space) x 20
= 51,200 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in
the space.
Vent-free heater _____________ Btu/Hr
Gas water heater* _____________ Btu/Hr
Gas furnace _____________ Btu/Hr
Vented gas heater _____________ Btu/Hr
Gas fireplace logs _____________ Btu/Hr
Other gas appliances* + ____________ Btu/Hr
Total = ____________ Btu/Hr
* Do not include direct-vent gas appliances. Di-
rect-vent draws combustion air from the outdoors
and vents to the outdoors.
Example:
Gas water heater _____________ Btu/Hr
Vent-free heater + ____________ Btu/Hr
Total = ____________ Btu/Hr
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)
60,000 Btu/Hr (actual amount of
Btu/Hr used)
The space in the above example is a confined space
because the actual Btu/Hr used is more than the maxi-
mum 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 adjoin-
ing 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.
B. Vent room directly to the outdoors. See Ventila-
tion Air From Outdoors, page 7.
AIR FOR COMBUSTION
AND VENTILATION
Continued
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 un-
confined space. You will need no additional fresh
air ventilation.
WARNING: If the area in
which the heater may be oper-
ated 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 National Fuel Gas Code,
ANSI Z223.1/NFPA 54 Section 5.3
or applicable local codes.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining un-
confined space. When ventilating to an adjoining
unconfined space, you must provide two perma-
nent openings: one within 12" (30.4 cm) of the
ceiling and one within 12" (30.4 cm) 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, ANSI Z223.1/NFPA 54,
Section 5.3, Air for Combustion and Ventilation for
required size of ventilation grills or ducts.
40,000
20,000
60,000
Figure 2 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option 3
Ventilation Grills
Into Adjoining Room,
Option 2
12"
12"
Ventilation
Grills
into Adjoining
Room,
Option 1

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AIR FOR COMBUSTION
AND VENTILATION
Continued
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills
or ducts. You must provide two permanent open-
ings: one within 12" (30.4 cm) of the ceiling and
one within 12" (30.4 cm) 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, ANSI Z223.1/NFPA 54, Section 5.3, Air for
Combustion and Ventilation for required size of
ventilation grills or ducts.
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.
Figure 3 - Ventilation Air from Outdoors
Outlet
Air
Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
INSTALLATION
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 pri-
mary 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 ser-
vice person must install heater.
Follow all local codes.
CHECK GAS TYPE
Use only the correct type of gas (natural or pro-
pane/LP). If your gas supply is not the correct gas
type, do not install heater. Call dealer where you
bought heater for proper type heater.
WARNING: This appliance
is equipped for (natural or pro-
pane/LP) gas. Field conversion
is not permitted.
INSTALLATION ITEMS
Before installing heater, make sure you have the
items listed below.
• for propane/LP gas, external regulator (supplied
by installer)
• piping from gas supply (check local codes)
• flex gas tubing
• sealant (resistant to propane/LP gas)
• equipment shutoff valve*
• flex gas line with 3/8" NPT tap
• ground joint union
• sediment trap
• tee joint
• pipe wrench
• for natural gas, test gauge connection*
* A CSA design-certified equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. The optional CSA design-
certified equipment shutoff valve can be purchased
from your dealer. See Accessories, page 21.

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8
LOCATING HEATER
WARNING: Maintain the
minimum clearances shown
in Figure 4. If you can, provide
greater clearances from floor,
ceiling and joining wall.
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture, cloth-
ing or other flammable objects
are less than 36" from the front,
top or sides of the heater
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas
CAUTION: If you install the
heater in a home garage
• heater pilot and burner must be
at least 18" above floor
• locate heater where moving
vehicle will not hit it
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 impu-
rities (such as, but not limited to,
tobacco smoke, aromatic candles,
cleaning fluids, oil or kerosene
lamps, etc.) in the air exist, may
discolor walls or cause odors.
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
Combustion and Ventilation, page 5. If high humid-
ity is experienced, a dehumidifier may be used to
help lower the water vapor content in the air.
INSTALLATION
Continued
For convenience and efficiency, install heater
• where there is easy access for operation, inspec-
tion and service
• in coldest part of room
Minimum
From
Sides Of
Heater
36" (91.4 cm)
14"
(35.6 cm)
minimum
FLOOR
CEILING
Minimum
Residential Heaters:
2" Minimum To Top
Surface Of Carpeting,
Tile Or Other
Combustible Material
Garage Heaters:
18" Minimum To
Garage Floor
Left
Side
Right
Side
6" (15.2 cm)
Figure 4 - Mounting Clearances As
Viewed From Front of Heater
INSTALLING HEATER TO WALL
Methods For Attaching Heater To Wall
Attach heater 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 into
wall studs.
Attaching to Wall Anchor: This method allows you
to attach mounting screws to hollow walls (wall
areas between studs) or to solid walls (concrete
or masonry).
Figure 5 - Attaching Thermostat Sensing
Bulb
Clamp Thermostat
Sensing Bulb
THERMOSTAT SENSING BULB
The thermostat sensing bulb is located on the lower
rear panel of heater.
1. Place clamp on thermostat sensing bulb as
shown in Figure 5. Clamp is provided in
hardware package.
2. Snap clamp into mounting hole as shown in
Figure 5. Mounting hole is located in the center
of lower back panel of heater. Make sure the
thermostat sensing bulb is horizontal.

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INSTALLATION
Continued
Decide which method better suits your needs. Either
method will provide a secure hold for the heater.
Marking Screw Locations
WARNING: Maintain mini-
mum clearances shown in
Figure 4. If you can, provide
greater clearances from floor
and joining wall.
Mark three screw locations on wall as shown
in Figure 6).
Figure 6 - Wall Mounting Clearances
18 3/4"
Min.
7"
Min.
9"
Min.
20,000 Btu Heaters
16 7/8"
30,000 Btu Heaters
24 5/16"
Adjoining Wall
Insert
Mounting
Screws
Floor
Locate hardware packet behind left side door
of heater.
Attaching To Wall Stud Method
For attaching heater to wall studs
1. Drill holes at marked locations using 9/64"
drill bit. Holes must be level to prevent com-
plications with front panel.
2. Tighten screws until screw head is 1/8" away
from wall.
Attaching To Wall Anchor Method
For attaching heater to hollow walls (wall areas be-
tween studs) or solid walls (concrete or masonry).
1. Drill holes at marked locations using 5/16"
drill bit. Holes must be level to prevent com-
plications with front panel. For solid walls
(concrete or masonry), drill at least 1" deep.
2. Fold wall anchor as shown in Figure 7.
3. Insert wall anchor (wings first) into hole. Tap
anchor flush to wall.
4. For thin walls (1/2" or less), insert red key
into wall anchor. Push red key to “pop” open
anchor wings. IMPORTANT: Do not hammer
key! For thick walls (over 1/2" thick) or solid
walls, do not pop open wings.
Placing Heater On Mounting Screws
1. Locate two top vertical key slots on back end
panels of heater.
2. Place heater onto mounting screws.
Figure 7 - Folding
Anchor
Figure 8 - Popping
Open Anchor Wings
For Thin Walls
Figure 9 - Vertical Key Slots for Mounting
Heater to Wall
Vertical
Key Slots
5. Insert mounting screws into wall anchors.
6. Tighten screws until screw head is 1/8" away
from wall.
CONNECTING TO GAS SUPPLY
WARNING: This appliance
requires a 3/8" NPT (National
Pipe Thread) inlet connection to
the pressure regulator.
WARNING: A qualified service
person must connect heater to gas
supply. Follow all local codes.
WARNING: For natural
gas, never connect heater to
private (non-utility) gas wells.
This gas is commonly known
as wellhead gas.
IMPORTANT: For natural gas, check gas line
pressure before connecting heater to gas line. Gas
line pressure must be no greater than 10.5" of wa-
ter. If gas line pressure is higher, heater regulator
damage could occur.

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10
Tee Joint
Reducer
Bushing
to 1/8"
NPT
1/8" NPT
Plug Tap
INSTALLATION
Continued
IMPORTANT: Install an equipment shutoff valve
in an accessible location. The equipment shutoff
valve is for turning on or shutting off the gas to
the appliance.
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from
going into pipe. Sealant in pipe could result in
clogged heater valves. Most flex gas tubing does
not require sealant. Read instructions supplied
with flex gas tubing.
WARNING: Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.
* A CSA design-certified equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. Purchase the optional CSA
design-certified equipment shutoff valve from your
dealer. See Accessories, page 21.
Figure 11 - Gas Connection
Figure 10 - External Regulator With Vent
Pointing Down
External
Regulator
Propane/LP
Supply Tank
Vent
Pointing
Down
Pressure
Regulator
Test Gauge
Connection*
Cap Tee Pipe
Joint Nipple
3/8" NPT
Pipe Nipple
3/8" Male
Flare to NPT
Connector
Sediment Trap
Equipment
Shutoff
Valve*
3" Min
Natural Gas
From Gas Meter
(4" W.C. to 10.5"
W.C. Pressure)
Propane/LP
From External
Regulator
(11" W.C. to 14"
W.C. Pressure)
Flex Gas
Line
Pipe Joint
Sealant
Required
(NPT End)
Pipe Joint
Sealant
Required
(NPT End)
3/8" Male
Flare
to NPT
Connector
CAUTION: For propane/LP
gas, never connect heater di-
rectly to the propane/LP supply.
This heater requires an external
regulator (not supplied). Install
the external regulator between the
heater and propane/LP supply.
For propane/LP gas, the installer must supply an
external regulator. The external regulator will
reduce incoming gas pressure. You must reduce
incoming gas pressure to between 11" and 14" of
water. If you do not reduce incoming gas pressure,
heater regulator damage could occur. Install the
external regulator with the vent pointing down
as shown in Figure 10. Pointing the vent down
protects it from freezing rain or sleet.
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-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
volume will occur.
Typical Inlet Pipe Diameters
20,000 Btu/Hr Models - 3/8" or greater
30,000 Btu/Hr Models - 1/2" or greater
Installation must include equipment 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 11).
Rear View
Hole
Provided
in Rear
Surround

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116307-01B
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping
and connections, internal and
external to unit, for leaks after
installing or servicing. Correct
all leaks at once.
WARNING: Never use an
open flame to check for a leak.
Apply a noncorrosive leak detec-
tion fluid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
CAUTION: For propane/LP
gas, make sure external regula-
tor has been installed between
propane/LP supply and heater.
See guidelines under Connect-
ing to Gas Supply, page 9.
PRESSURE TESTING GAS SUPPLY
PIPING SYSTEM
Test Pressures In Excess Of 1/2 PSIG
(3.5 kPa)
1. Disconnect appliance with its appliance main
gas valve (control valve) and equipment
shutoff valve from gas supply piping system.
Pressures in excess of 1/2 psig will damage
heater regulator.
INSTALLATION
Continued
2. Cap off open end of gas pipe where equipment
shutoff valve was connected.
3. Pressurize supply piping system by either
opening propane/LP supply tank valve for
propane/LP gas or opening main gas valve
located on or near gas meter for natural gas
or using compressed air.
4. Check all joints of gas supply piping system.
Apply a noncorrosive leak detection fluid to
all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff valve
to gas supply. Check reconnected fittings for
leaks.
Test Pressures Equal To or Less Than 1/2
PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 12).
2. Pressurize supply piping system by either
opening propane/LP supply tank valve for
propane/LP gas or opening main gas valve
located on or near gas meter for natural gas
or using compressed air.
3. Check all joints from gas meter for natural gas
or propane/LP supply tank for propane/LP gas,
to equipment shutoff valve (see Figure 13 or 14,
page 12). Apply a noncorrosive leak detection
fluid to all joints. Bubbles forming show a leak.
4. Correct all leaks at once.
PRESSURE TESTING HEATER GAS
CONNECTIONS
1. Open equipment shutoff valve (see Figure 12).
2. For natural gas open main gas valve located
on or near gas meter. For propane/LP gas open
propane/LP supply tank valve.
3. Make sure control knob of heater is in the OFF
position.
4. Check all joints from equipment shutoff valve to
thermostat gas valve (see Figure 13 or 14, page
12). Apply a noncorrosive leak detection fluid
to all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light heater (see Operating Heater, this page).
Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to Appli-
ance, page 13).
8. Install refractory and front panel.
Install sediment trap in supply line as shown in
Figure 11, page 10. 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.
Install male connector and flex gas line to equipment
shutoff valve through hole provided in rear surround
as shown in Figure 11, page 10.
IMPORTANT: Hold the pressure regulator and
connector with wrench when connecting it to gas
piping and/or fittings. Do not over tighten pipe
connection to regulator. The regulator body could
be damaged.
Figure 12 - Equipment Shutoff Valve
Open
Closed
Equipment
Shutoff Valve

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12
INSTALLATION
Continued
Figure 14 - Checking Gas Joints for
Propane/LP Gas
Propane/LP
Supply Tank
Figure 13 - Checking Gas Joints for
Natural Gas
Gas
Meter
Thermostat
Gas Valve
Equipment
Shutoff
Valve
Thermostat
Gas Valve
Equipment
Shutoff
Valve
OPERATING HEATER
FOR YOUR SAFETY READ
BEFORE LIGHTING
WARNING: If you do not fol-
low these instructions exactly,
a fire or explosion may result
causing property damage, per-
sonal 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 neighborʼs phone. Follow the gas
supplierʼs 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,
donʼt try to repair it, call a qualified service
technician. Force or attempted repair may
result in a fire or explosion.
Figure 15 - Installing Front Panel and
Refractory
Refractory
Front Panel
Shoulder
Screw
Installing Refractory and Front Panel
WARNING: Examine refrac-
tory panel. If damaged, do not
operate heater. See Replace-
ment Parts, page 21.
1.
Gently lift refractory and position into heater.
Take care not to damage refractory. Ensure
refractory sits behind preforated tab. (see Figure
15). If refractory is damaged call the phone num-
ber found under Replacement Parts, page 21.
CAUTION: Refractory may
shift inside heater. When install-
ing or removing front panel, use
caution to prevent refractory
from falling.
2. Install front diffuser as shown in Figure 15.
3. Install front panel of heater by placing slots on
each side over and down onto shoulder screws
(see Figure 15).
Front
Diffuser
Preforated
Tab

www.desatech.com 13116307-01B
Note: If pilot goes out, repeat steps 4 thru 7.
Thermostat models have a safety interlock
system. Wait one (1) minute before lighting
pilot again.
9. Turn control knob counterclockwise
to desired heating level. The main burner
should light.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
Figure 16 - Control Knob In The OFF
Position
O
F
F
P
I
L
O
T
Control Knob
Ignitor Button
(Actual Ignitor may vary)
Figure 17 - Pilot
Ignitor
Electrode
Pilot
Burner
Thermocouple
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 starting
on page 12.
2. Make sure equipment shutoff valve is
fully open.
3. Turn off any electric power to the appliance
if service is to be performed.
4. Turn control knob clockwise to the
OFF position.
5. Wait five 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 starting on page 12. If you donʼt
smell gas, go to the next step.
6. Turn control knob counterclockwise
to the PILOT position. Press in control knob
for five (5) seconds.
7. With control knob pressed in, push down
and release ignitor button. This will light
pilot. The pilot is attached to the front of
burner. Note: You may be running this
heater for the first time after hooking up to
gas supply. If so, you may need to press in
control knob for 30 seconds or more. This
will allow air to bleed from the gas system.
If needed, keep pressing ignitor button until
pilot lights. If ignitor does not light pilot,
refer to Troubleshooting, page 16 or 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 14.
8. 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.
OPERATING HEATER
Continued
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. Turn control knob clockwise to the
OFF position.
2. Turn off all electric power to the appliance
if service is to be performed.
Shutting Off Burner Only (pilot stays lit)
Turn control knob clockwise to the
PILOT position.

www.desatech.com 116307-01B
14
OPERATING HEATER
Continued
If pilot flame pattern is incorrect, as shown in
Figure 19
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 13)
• see Troubleshooting, page 16
Note: The pilot flame on natural gas units will
have a slight curve, but flame should be blue and
have no yellow or orange color.
Figure 19 - Incorrect Pilot Flame Pattern
Figure 18 - Correct Pilot Flame Pattern
Thermocouple
Pilot Burner
Pilot Burner
Thermocouple
Blue Pilot Flame
Yellow Pilot Flame
BURNER FLAME PATTERN
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide.
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.
THERMOSTAT CONTROL
OPERATION
The thermostatic control used on these models
differs from standard thermostats. Standard
thermostats simply turn on and off the burner.
The thermostat used on this heater senses the
room temperature. 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 1 and 5. This adjusts the
amount of gas flow to the burner that increases
or decreases the burner flame height.
Note: The thermostat sensing bulb measures
the temperature of air near the heater cabinet.
This may not always agree with room tem-
perature (depending on housing construction,
installation location, room size, open air tem-
peratures, etc.) Frequent use of your heater will
let you determine your own comfort levels.
MANUAL LIGHTING
PROCEDURE
1. Remove front panel (see Figure 10, page 9).
2. Follow steps 1 through 7 under Lighting
Instructions, page 13.
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. Now follow step 9, under
Lighting Instructions, page 13.
5. Replace front panel.
INSPECTING HEATER
Check pilot flame pattern and burner flame pat-
tern often.
PILOT FLAME PATTERN
Figure 18 shows a correct pilot flame pattern. Figure
19 shows an incorrect pilot flame pattern. The incor-
rect pilot flame is not touching the thermocouple.
This will cause the thermocouple to cool. When the
thermocouple cools, the heater will shut down.

www.desatech.com 15116307-01B
INSPECTING HEATER
Continued
Figure 20 - Correct Burner Flame Pattern
Yellow
Tipping
Figure 21 - Incorrect Burner Flame Pattern
Blue
Flame
CLEANING AND
MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep
control areas, burner and circu-
lating air passageways of heater
clean. Inspect these areas of
heater before each use. Have
heater inspected yearly by a
qualified service person. Heater
may need more frequent clean-
ing due to excessive lint from
carpeting, bedding material, pet
hair, etc.
WARNING: Failure to keep
the primary air opening(s) of
the burner(s) clean may result in
sooting and property damage.
ODS/PILOT AND BURNER
Use a vacuum cleaner, pressurized air or small,
soft bristled brush to clean.
BURNER PILOT AIR INLET
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 three
months during operation and have heater inspected
yearly by a qualified service person.
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 com-
pressed air in a can, please follow the directions on
the can. If you donʼt 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 for dust and dirt.
3. Blow air across the ports/slots and holes in the
burner.
4. Never insert objects into the pilot tube.
Clean the pilot assembly also. A yellow tip on the
pilot flame indicates dust and dirt in the pilot as-
sembly. There is a small pilot air inlet about two
inches from where the pilot flame comes out of
the pilot assembly (see Figure 22). With the heater
off, lightly blow air through the air inlet. You may
blow through a drinking straw if compressed air
is not available.
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.
Figure 22 - Pilot Air Inlet
Pilot Assembly
Pilot Air Inlet
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.
If burner flame pattern is incorrect, as shown in
Figure 21
• turn heater off (see To Turn Off Gas to Appli-
ance, page 14)
• see Troubleshooting, page 16

www.desatech.com 116307-01B
16
TROUBLESHOOTING
WARNING: Turn off and unplug heater and let cool before servicing.
Only a qualified service person should service and repair heater.
CAUTION: Never use a wire, needle or similar object to clean
ODS/pilot. This can damage ODS/pilot unit.
Note: All troubleshooting items are listed in order of operation.
POSSIBLE CAUSE
1. Ignitor electrode positioned
wrong
2. Ignitor electrode broken
3. Ignitor electrode not con-
nected to ignitor cable
4. Ignitor cable pinched or wet
5. Broken ignitor cable
6. Bad piezo ignitor
7. Piezo ignitor nut is loose
(piezo ignition models only)
8. Battery not installed, battery
power low or battery not
installed correctly (electronic
ignition models only)
1. Gas supply turned off or equip-
ment shutoff valve closed
2. Thermostat control knob not
fully pressed in while pressing
ignitor button
3. Air in gas lines when in-
stalled
4. Depleted gas supply (propane/
LP gas)
5. ODS/pilot is clogged
6. Gas regulator setting is not
correct
7. Thermostat control knob is not
in pilot position
REMEDY
1. Replace pilot assembly
2. Replace pilot assembly
3. Reconnect ignitor cable
4. Free ignitor cable if pinched
by any metal or tubing. Keep
ignitor cable dry
5. Replace ignitor cable
6. Replace piezo
7. Tighten nut holding piezo
ignitor. Nut is located inside
heater cabinet at top
8. Install new alkaline battery
in electronic ignitor. Verify
battery is installed correctly
1. Turn on gas supply or open
equipment shutoff valve
2. Turn to PILOT/IGN posi-
tion. Fully press in thermostat
control knob while pressing
ignitor button
3. Continue holding down con-
trol knob. Repeat igniting op-
eration until air is removed
4. Contact local propane/LP gas
company
5. Clean ODS/pilot (see Cleaning
and Maintenance, page 15) or
replace ODS/pilot assembly
6. Replace gas regulator
7. Turn thermostat control knob
to pilot position
OBSERVED PROBLEM
When ignitor button is pressed
in, there is no spark at ODS/
pilot
When ignitor button is pressed
in, there is a spark at ODS/Pilot
but no ignition

www.desatech.com 17116307-01B
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1. Control knob not fully pressed in
2. Control knob not pressed in
long enough
3. Equipment shutoff valve not
fully open
4. Thermocouple connection
loose at control valve
5. Pilot flame not touching ther-
mocouple, which allows ther-
mocouple 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
6. Thermocouple damaged
7. Control valve damaged
8. Safety interlock system has
been triggered (thermostat
models only)
1. Burner orifice(s) is clogged
2. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orifice(s) is clogged
1. Burner orifice(s) is clogged or
damaged
2. Burner damaged
3. Gas regulator defective
REMEDY
1. Press in control knob fully
2. After ODS/pilot lights, keep con-
trol knob pressed in 30 seconds
3. Fully open equipment shutoff
valve
4. Hand tighten until snug, then
tighten 1/4 turn more
5. A) Contact local natural or
propane/LP gas company
B) Clean ODS/pilot (see
Cleaning and Maintenance,
page 15) or replace ODS/pilot
assembly
6. Replace pilot assembly
7. Replace control valve
8. Wait one minute for safety in-
terlock system to reset. Repeat
ignition operation
1. Clean burner orifice(s) (see
Cleaning and Maintenance,
page 15) or replace burner
orifice(s)
2. Contact local natural or pro-
pane/LP gas company
1. Contact local natural or pro-
pane/LP gas company
2. Clean burner orifice(s) (see
Cleaning and Maintenance,
page 15) or replace burner
orifice(s)
1. Clean burner orifice(s) (see
Cleaning and Maintenance,
page 15) or replace burner
orifice(s)
2. Replace burner
3. Replace gas regulator
OBSERVED PROBLEM
ODS/pilot lights but flame
goes out when control knob is
released
Burner(s) does not light after
ODS/pilot is lit
Delayed ignition of burner(s)
Burner backfiring during com-
bustion

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18
POSSIBLE CAUSE
1. Not enough air
2. Gas regulator defective
3. Clogged or dirty burner
4. Air blowing into heater
5. Burner not positioned in
bracket properly
1. Residues from manufacturing
processes
1. Metal expanding while heating
or contracting while cooling
1. Turning control knob to the
highest position when burner
is cold
2. Air in gas line
3. Air passageways on heater
blocked
4. Dirty or partially clogged
burner orifice
1. When heated, vapors from
furniture polish, wax, carpet
cleaner, etc., may turn into
white powder residue
1. Not enough fresh air is avail-
able
2. Low line pressure
3. ODS/pilot is partially
clogged
REMEDY
1. Check burner for dirt and
debris. If found, clean burner
(see Cleaning and Mainte-
nance, page 15)
2. Replace gas regulator
3. Clean burner (see Cleaning
and Maintenance, page 15)
4. Turn off air supply
5. Have a qualified service person
or installer inspect burner
1. Problem will stop after a few
hours of operation
1. This is common with most heat-
ers. If noise is excessive, contact
qualified service person
1. Turn control knob to the low-
est position and let warm up
for a minute
2. Operate burner until air is
removed from line. Have gas
line checked by local natural
or propane/LP gas company
3. Observe minimum installation
clearances (see Figure 4, page 8)
4. Clean burner (see Cleaning
and Maintenance, page 15)
or replace burner orifice
1. Turn heater off when using
furniture polish, wax, carpet
cleaners or similar products
1. Open window and/or door for
ventilation
2. Contact local natural or pro-
pane/LP gas company
3. Clean ODS/pilot (see Cleaning
and Maintenance, page 15)
OBSERVED PROBLEM
Yellow flame during burner
combustion
Slight smoke or odor during
initial operation
Heater produces a clicking/tick-
ing noise just after burner is lit
or shut off
Heater produces a whistling
noise when burner is lit
White powder residue forming
within burner box or on adjacent
walls or furniture
Heater shuts off in use (ODS
operates)
TROUBLESHOOTING
Continued

www.desatech.com 19116307-01B
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. Fol-
low the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the 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.
POSSIBLE CAUSE
1. Heater burning vapors from
paint, hair spray, glues, etc.
See IMPORTANT statement
above
2. Low fuel supply (propane/LP
gas)
3. Gas leak. See Warning
statement at top of page
1. Gas leak. See Warning
statement at top of page
2. Control valve defective
1. Foreign matter between con-
trol valve and burner
2. Gas leak. See Warning
statement at top of page
1. Not enough combustion/ven-
tilation air
REMEDY
1. Ventilate room. Stop using
odor causing products while
heater is running
2. Refill supply tank
3. Locate and correct all leaks
(see Checking Gas Connec-
tions, page 11)
1. Locate and correct all leaks
(see Checking Gas Connec-
tions, page 11)
2. Replace control valve
1. Take apart gas tubing and
remove foreign matter
2. Locate and correct all leaks
(see Checking Gas Connec-
tions, page 11)
1. Refer to Air for Combustion
and Ventilation requirements
(page 5)
OBSERVED PROBLEM
Heater produces unwanted
odors
Gas odor even when control
knob is in OFF position
Gas odor during combustion
Moisture/condensation noticed
on windows
TECHNICAL SERVICE
You may have further questions about installation,
operation or troubleshooting. If so, contact DESA
Heating Productsʼ Technical Service Department
at 1-866-672-6040. When calling please have your
model and serial numbers of your heater ready.
You can also visit DESA Heating Productsʼ techni-
cal service web site at www.desatech.com.
SERVICE PUBLICATIONS
You can purchase a service manual from the address
listed on the back page of this manual. Send a check
for $5.00 payable to DESA Heating Products.
SERVICE HINTS
When Gas Pressure Is Too Low
• pilot will not stay lit
• burner will have delayed ignition
• heater will not produce specified heat
• propane/LP gas supply may be low
You may feel your gas pressure is too low. If so, con-
tact your local natural or propane/LP gas supplier.

www.desatech.com 116307-01B
20
SPECIFICATIONS
REM20NT, SF20NT, SFG20NT,
SPC20NT AND VSFG20NT
• Natural Gas
• 10,500/20,000 Btu/Hr (Variable)
• Piezo Ignition
• Pressure Regulator Setting - 3" W.C.
• Inlet Gas Pressure* (in. of water)
Maximum - 10.5" - Minimum - 4"
LSF20NT, LSFG20NT, VSF20NT AND
VSFG20NT
• Natural Gas
• 15,000/20,000 Btu/Hr (Variable)
• Electronic Ignition
• Pressure Regulator Setting - 3" W.C.
• Inlet Gas Pressure* (in. of water)
Maximum - 10.5" - Minimum - 4"
SF30NT
• Natural Gas
• 15,500/30,000 Btu/Hr (Variable)
• Piezo Ignition
• Pressure Regulator Setting - 3" W.C.
• Inlet Gas Pressure* (in. of water)
Maximum - 10.5" - Minimum - 4"
LSF30NT, VSF30NT
• Natural Gas
• 15,500/30,000 Btu/Hr (Variable)
• Electronic Ignition
• Pressure Regulator Setting - 3" W.C.
• Inlet Gas Pressure* (in. of water)
Maximum - 10.5" - Minimum - 4"
REM20PT, SF20PT, SFG20PT,
SPC20PT AND VSFG20PT
• Propane/LP Gas
• 10,500/20,000 Btu/Hr (Variable)
• Piezo Ignition
• Pressure Regulator Setting - 8" W.C.
• Inlet Gas Pressure* (in. of water)
Maximum - 14" - Minimum - 11"
LSF20PT, LSFG20PT, VSF20PT AND
VSGF20PT
• Propane/LP Gas
• 10,500/20,000 Btu/Hr (Variable)
• Electronic Ignition
• Pressure Regulator Setting - 8" W.C.
• Inlet Gas Pressure* (in. of water)
Maximum - 14" - Minimum - 11"
SF30PT
• Propane/LP Gas
• 15,500/30,000 Btu/Hr (Variable)
• Piezo Ignition
• Pressure Regulator Setting - 8" W.C.
• Inlet Gas Pressure* (in. of water)
Maximum - 14" - Minimum - 11"
LSF30PT, VSF30PT
• Propane/LP Gas
• 15,500/30,000 Btu/Hr (Variable)
• Electronic Ignition
• Pressure Regulator Setting - 8" W.C.
• Inlet Gas Pressure* (in. of water)
Maximum - 14" - Minimum - 11"
* For purposes of input adjustment.