Desa SB70DT User manual

PORTABLE FORCED
AIR HEATER
(WITH BUILT-IN THERMOSTAT)
OWNER’S MANUAL
IMPORTANT: Read and understand this manual before assembling, start-
ing, or servicing heater. Improper use of heater can cause serious injury.
Keep this manual for future reference.
®
Fill In For Your Records
Model No. ___________________
(Located on side panel)
Serial No. ___________________
(Located on fuel tank)
Heater Size:
70,000 Btu/Hr
H.S.I. Series
TABLE OF CONTENTS
SAFETY INFORMATION .............................................2
PRODUCT IDENTIFICATION......................................3
THEORY OF OPERATION ..........................................3
UNPACKING................................................................3
FUELS .........................................................................4
VENTILATION..............................................................4
OPERATION ................................................................4
OPERATION WITH PORTABLE GENERATOR ..........4
STORING, TRANSPORTING, OR SHIPPING.............5
PREVENTATIVE MAINTENANCE SCHEDULE ..........5
TROUBLESHOOTING.................................................6
SERVICE PROCEDURES...........................................7
REPLACEMENT PARTS ...........................................10
TECHNICAL SERVICE..............................................10
SPECIFICATIONS .....................................................11
ACCESSORIES ......................................................... 11
WIRING DIAGRAM....................................................11
ILLUSTRATED PARTS BREAKDOWN .....................12
PARTS LIST...............................................................13
WARRANTY AND REPAIR SERVICE .......................14

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SAFETY
INFORMATION
Carbon Monoxide Poisoning: Early signs
ofcarbonmonoxidepoisoningresemblethe
flu, with headaches, dizziness, and/or nau-
sea. 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.Theseincludepregnantwomen,per-
sons with heart or lung disease or anemia,
those under the influence of alcohol, and
those at high altitudes.
Make certain you read and understand all
warnings.Keepthismanualforreference.It
isyourguidetosafeandproperoperationof
this heater.
• Use only kerosene or No. 1 fuel oil to
avoid risk of fire or explosion. Never use
gasoline, naphtha, paint thinners, alco-
hol, or other highly flammable fuels.
• Fueling
a) Personnel involved with fueling shall
be qualified and thoroughly familiar
with the manufacturer’s instructions
and applicable federal, state, and lo-
cal regulations regarding the safe fu-
eling of heating units.
b) Only the type of fuel specified on the
heater’s data plate shall be used.
c) Allflame,includingthepilotlight,ifany,
shall be extinguished and the heater al-
lowed to cool, prior to fueling.
d) During fueling, all fuel lines and fuel-
lineconnections shall be inspected for
leaks.Anyleaks shall berepaired prior
to returning the heater to service.
e) At no time shall more than one day’s
supply of heater fuel be stored inside
abuildinginthevicinityofthe heater.
Bulk fuel storage shall be outside the
structure.
f) All fuel storage shall be located a
minimum of 25 feet from heaters,
torches, welding equipment, and
similarsources of ignition (exception:
the fuel reservoir integral with the
heater unit).
g) Whenever possible, fuel storage shall
be confined to areas where floor pen-
etrations do not permit fuel to drip
onto or be ignited by a fire at lower
elevation.
h) Fuel storage shall be in accordance
withthefederal,state, or local author-
ity having jurisdiction.
• Never use heater where gasoline, paint
thinner,orother highly flammable vapors
are present.
• Follow all local ordinances and codes
when using heater.
• Heaters used in the vicinity of tarpaulins,
canvas, or similar enclosure materials
shallbe located a safe distance from such
materials. The recommended minimum
safe distance is 10 feet. It is further rec-
ommended that these enclosure materi-
als be of a fire retardant nature. These
enclosure materials shall be securely fas-
tened to prevent them from igniting or
from upsetting the heater due to wind
action.
• Use only in well-vented areas. Before
using heater, provide at least a three-
square-foot opening of fresh, outside air
for each 100,000 Btu/Hr of rating. This
heaterproducescarbon monoxide, which
is listed by the State of California as a
reproductive toxin under Proposition 65.
• Use only in places free of flammable va-
pors or high dust content.
• Use only the electrical voltage and fre-
quency specified on model plate.
• Use only a three-prong, grounded exten-
sion cord.
• Minimum heater clearances from com-
bustibles:
Outlet: 8 Ft. Sides: 4 Ft.
Top: 4 Ft. Rear: 4 Ft.
• Locate heater on a stable and level sur-
face if heater is hot or running or a fire
may occur.
• When moving or storing heater, keep
heater in a level position or fuel spillage
may occur.
• Keep children and animals away from
heater.
• Unplug heater when not in use.
• This heater is equipped with a thermo-
stat. Heater may start anytime.
• Never use heater in living or sleeping
areas.
• Never block air inlet (rear) or air outlet
(front) of heater.
• Never move, handle, refuel, or service a
hot, operating, or plugged-in heater.
• Never attach duct work to front or rear
of heater.
•Warning to New York City Residents
For Use Only At Construction Sites
inaccordance with applicableNYC codes
under NYCFD certificate of approval
#4803, #4899, #4908, #4909, or #4934.
WARNINGS
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, oper-
ate, or service this heater. Im-
proper use of this heater can
causeseriousinjuryordeathfrom
burns, fire, explosion, electrical
shock, and carbon monoxide
poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
•SAFETY INFORMATION

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UNPACKING
1. Remove all packing items applied to
heater for shipment.
2. Remove all items from carton.
3. Check items for shipping damage. If
heater is damaged, promptly inform
dealer where you bought heater.
Figure 1 - 70,000 Btu/Hr
PRODUCT IDENTIFICATION
Handle
Fuel Cap
Lower Shell
Power Cord
Fuel Tank
Hot Air Outlet
Air Filter
End Cover
Fan Guard
Upper Shell
Side Cover
Ignition Control Assembly
(assembly on inside of side cover)
Thermostat Knob
Figure 2 - Cross Section Operational View
Clean
Heated
Air Out
The Fuel System: The air pump forces air
through the air line. The air is then pushed
through the nozzle. This air causes fuel to
lift from the tank. A fine mist of fuel is
sprayed into the combustion chamber.
The Air System: The motor turns the fan.
The fan pushes air into and around the
combustion chamber. This air is heated and
provides a stream of clean, hot air.
Fuel
Filter Air Line
To Burner
Air
Output
Filter
Air Pump
Air Intake
Filter
Cool
Air
In
Fan
Combustion ChamberIgnitor Motor
Ignition Control
Assembly
Air For Fuel System Air For Combustion
And Heating Fuel
Nozzle
Fuel
Tank
THEORY OF OPERATION
The Ignition System: The ignition control
assembly provides power to the ignitor.
This ignites the fuel/air mixture in the com-
bustion chamber.
TheFlame-OutControlSystem: Thissys-
tem causes the heater to shut down if the
flame goes out.
•PRODUCT IDENTIFICATION
•THEORY OF OPERATION
•UNPACKING

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Donotuse heavyfuelssuch asNo.2 fueloil
or No. 2 Diesel. Using heavy fuels will
result in a clogged fuel filter and/or nozzle.
IMPORTANT: Use a KEROSENE ONLY
storagecontainer.Besurestoragecontaineris
clean. Foreign matter such as rust, dirt, or
waterwillcausetheignitioncontrolassembly
to shut down the heater. Foreign matter may
also require you to clean fuel system often.
Provideatleast athree-square-foot opening
offresh,outsideairforeach100,000Btu/Hr
rating. Provide extra fresh air if more heat-
ers are being used.
Example: A 70,000 Btu/Hr heater requires
one of the following:
• atwo-car garage door (16 feetwideopen-
ing) raised two inches
• a single-car garage door (9 feet wide
opening) raised three inches
• two windows (30 inches wide opening)
raised six inches
WARNING:Useonlykerosene
orNo.1fueloiltoavoidriskoffire
or explosion. Never use gaso-
line, naphtha, paint thinners, al-
cohol, or other highly flammable
fuels.
FUELS
VENTILATION
Follow the minimum fresh,
outside air ventilation require-
ments.Ifproperfresh,outsideair
ventilation is not provided, car-
bon monoxide poisoning can
occur. Provide proper fresh, out-
side air ventilation before run-
ning heater.
TO START HEATER
1. Follow all ventilation and safety infor-
mation.
2. Locate heater to provide maximum cir-
culation of the heated air. Follow all
location requirements noted in Safety
Information, page 2.
3. Fill fuel tank with kerosene or No. 1
fuel oil.
4. Attach fuel cap.
5. Turn thermostat knob clockwise to the
HIGH position.
6. Plug power cord of heater into three-
prong,grounded extension cord. Exten-
sion cord must be at least six feet long.
Extension CordWire Size
Requirements
• 6 to 10 feet long, use 18AWG rated
cord
• 11 to 100 feet long, use 16 AWG
rated cord
• 101 to 200 feet long, use 14 AWG
rated cord
7. Plugextensioncordintostandard120volt/
60 hertz, three-hole, grounded outlet.
Note: Ignitor will preheat for five sec-
onds then heater will start.
8. Adjust thermostat knob to the desired
setting. Note: Acold heater may affect
the thermostat setting. Further adjust-
ment may be needed until the heater
cycles at the desired setting. This ther-
mostat is a general-heating control. It
is not intended for precise temperature
control.
TO STOP HEATER
Unplug extension cord from outlet.
OPERATION
WARNING: Review and un-
derstand the warnings in the
Safety Information section, page
2. They are needed to safely op-
erate this heater. Follow all local
codes when using this heater.
TO RESET HEATER
1. Unplug extension cord from outlet and
wait 10 seconds (two minutes if heater
has been running).
2. Repeat steps 5 through 8 of To Start
Heater.
•FUELS
•VENTILATION
•OPERATION
•OPERATION WITH PORTABLE
GENERATOR
F
OPERATION WITH
PORTABLE
GENERATOR
WARNING: Before operating
heater or any appliance from a
portable generator, verify that
generatorhasbeenproperlycon-
nectedtoearthground.Improper
grounding or failure to ground
generator can result in electro-
cution if a ground fault occurs.
Refertoowner’smanualsupplied
by generator manufacturer for
proper grounding procedures.
The operating voltage range of the heater is
108 to 132 Volts (120 Volts +/- 10%). Prior
to plugging heater into generator the output
voltage should be verified (if generator is
equippedwiththe automatic idle feature, the
output voltage should be measured with the
generator running at full speed). If the volt-
age does not measure in this range the heater
should not be plugged into the generator.
Refer to Operation, column two of this
page, for starting, stopping, and resetting
heater procedures.
Figure 3 - Typical Generator Grounding
Method(Generatorconstructionmayvary
from that shown)
Ground Lug
Ground Wire (#10 AWG
Stranded-Copper)
Alternator
Copper
or Brass
Grounding
Point

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STORING,
TRANSPORTING,
OR SHIPPING
Note: If shipping, transport companies re-
quire fuel tanks to be empty.
1. Drain fuel tank. Drain fuel through fuel
cap opening. Be sure all fuel is re-
moved.
2. If any debris is noted in old fuel, add 1
or 2 quarts of clean kerosene to tank,
stir, and drain again. This will prevent
excess debris from clogging filters dur-
ing future use.
3. Replacefuelcap.Properly disposeof old
and dirty fuel. Check with local auto-
motive service stations that recycle oil.
4. If storing, store heater in dry place.
Make sure storage place is free of dust
and corrosive fumes.
IMPORTANT: Do not store kerosene over
summer months for use during next heating
season.Usingoldfuelcoulddamageheater.
PREVENTATIVE
MAINTENANCE
SCHEDULE
WARNING: Never service heater
while it is plugged in, operating, or hot.
Severe burns and electrical shock can
occur.
Item
Fuel tank
Air output
andlintfilters
Air intake
filter
Fuel filter
Ignitor
Fan blades
Motor
How Often
Flush every 150-200 hours of opera-
tion or as needed
Replace every 500 hours of operation
or once a year
Washanddrywithsoapanwaterevery
500 hours of operation or replace as
needed
Clean twice a heating season or re-
place as needed
No maintenance required
Clean each season or as needed
Not required/permanently lubricated
How To
See Storing, Transporting, or
Shipping
See Air Output, Air Intake, and
Lint Filters, page 7
See Air Output, Air Intake, and
Lint Filters, page 7
See Fuel Filter, page 8
See Fan, page 7
•STORING, TRANSPORTING, OR
SHIPPING
•PREVENTATIVE MAINTENANCE
SCHEDULE

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TROUBLESHOOTING WARNING: Never service heater while it is plugged in, operating, or
hot. Severe burns and electrical shock can occur.
REMEDY
1. Check circuit breaker in electrical panel
2. Turn thermostat knob to a higher setting
3. Check all electrical connections. See
Wiring Diagram, page 11
4. See Ignition Control Assembly, page 8
5. If fan does not turn freely, see Pump
Rotor, page 10
6. Replace ignition control assembly
7. Replace motor
1. Fill tank with kerosene
2. See Pump Pressure Adjustment, page 7
3. See Fuel Filter, page 8
4. See Nozzle Assembly, page 9
5. Drain and flush fuel tank with clean
kerosene. See Storing, Transporting, or
Shipping, page 5
6. Check electrical connections. See Wir-
ing Diagram, page 11
7. Replace ignitor, see page 8
8. Replace ignition control assembly
1. See Pump Pressure Adjustment, page 7
2. See Air Output, Air Intake, and Lint Fil-
ters, page 7
3. See Fuel Filter, page 8
4. See Nozzle Assembly, page 9
5. Make sure photocell boot is properly
seated in bracket
6. Clean photocell lens
7. Check electrical connections. See Wir-
ing Diagram, page 11
8. Replace photocell
9. Replace ignition control assembly
POSSIBLE CAUSE
1. No power to heater
2. Thermostat setting is too low
3. Bad electrical connection between mo-
tor and ignition control assembly or ig-
nition control assembly and power cord
4. Blown fuse on ignition control assembly
5. Binding pump rotor
6. Defective ignition control assembly
7. Defective motor
1. No fuel in tank
2. Pump pressure incorrect
3. Dirty fuel filter
4. Obstruction in nozzle
5. Water in fuel tank
6. Bad electrical connection between igni-
tor and ignition control assembly
7. Defective ignitor
8. Defective ignition control assembly
1. Pump pressure incorrect
2. Dirty air intake, air output, and/or lint
filter
3. Dirty fuel filter
4. Obstruction in nozzle
5. Photocell assembly not properly in-
stalled (not seeing the flame)
6. Dirty photocell lens
7. Bad electrical connection between pho-
tocell and ignition control assembly
8. Defective photocell
9. Defective ignition control assembly
OBSERVED FAULT
Motordoesnotstartfivesecondsafterheater
is plugged in
Motor starts and runs but heater does not
ignite
Heaterignitesbutignitioncontrolassembly
shuts heater off after a short period of time
WARNING:Highvoltage!
WARNING:Highvoltage!
WARNING:Highvoltage!
Note: For additional help, visit DESA
International’s technical service web
site at www.desatech.com.
www.desatech.com
•TROUBLESHOOTING

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Figure 4 - Upper Shell Removal
Figure 5 - Fan Cross Section
SERVICE
PROCEDURES
WARNING: Never service
heater while it is plugged in, op-
erating,or hot. Severeburns and
electrical shock can occur.
UPPER SHELL REMOVAL
1. Remove screws along each side of
heater using 5/16" nut-driver. These
screws attach upper and lower shells
together.
2. Lift upper shell off.
3. Remove fan guard.
FAN
IMPORTANT: Removefanfrommotorshaft
before removing motor from heater. The
weightofthe motor resting on the fan could
damage the fan pitch.
1. Remove upper shell (see Upper Shell
Removal).
2. Use 1/8" Allen wrench to loosen set-
screw which holds fan to motor shaft.
3. Slip fan off motor shaft.
4. Clean fan using soft cloth moistened
with kerosene or solvent.
5. Dry fan thoroughly.
6. Replace fan on motor shaft. Place fan
hub flush with end of motor shaft (see
Figure 5).
7. Place setscrew on flat of shaft. Tighten
setscrew firmly (40-50 inch-pounds).
8. Replace fan guard and upper shell.
Figure 6 - Air Output, Air Intake, and Lint
Filters
Air Intake Filter
Filter End Cover
Fan Guard
Air Output Filter
Lint Filter
AIR OUTPUT, AIR INTAKE,
AND LINT FILTERS
1. Remove upper shell (see Upper Shell
Removal).
2. Remove filter end cover screws using
5/16" nut-driver.
3. Remove filter end cover.
4. Replace air output and lint filters.
5. Wash or replace air intake filter (see
Preventative Maintenance Schedule,
page 5).
6. Replace filter end cover.
7. Replace fan guard and upper shell.
IMPORTANT: Do not oil filters.
Continued
Upper Shell
Fan Guard
Fan
Motor
Flush
Setscrew
Motor
Shaft
Figure 7 - Pressure Gauge Plug Removal
Relief Valve
Pressure
Gauge Plug
Figure 8 - Adjusting Pump Pressure
Pressure
Gauge
PUMP PRESSURE
ADJUSTMENT
1. Remove pressure gaugeplugfrom filter
end cover.
2. Install accessory pressure gauge (part
number HA1180).
3. Start heater (see Operation, page 4).
Allow motor to reach full speed.
4. Using a flat blade screwdriver, adjust
pressure. Turn relief valve to right to
increase the pressure. Turn relief valve
to left to decrease the pressure. Set
pump pressure at 4.7 PSI.
5. Stop heater (see Operation, page 4).
6. Remove pressure gauge. Replace pres-
sure gauge plug in filter end cover.
•SERVICE PROCEDURES

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SERVICE
PROCEDURES
Continued
FUEL FILTER
1. Remove 4 side cover screws using
5/16" nut-driver.
2. Remove side cover.
3. Pull upper fuel line off fuel filter neck.
4. Carefully pry bushing andfuelfilterout
of fuel tank.
5. Wash fuel filter with clean fuel and re-
place in tank.
6. Attach upper fuellineto fuel filter neck.
7. Replace side cover.
WARNING: Never service
heater while it is plugged in, op-
erating,or hot. Severeburns and
electrical shock can occur.
Fuel Filter
Side Cover Upper Fuel Line
Figure 9 - Fuel Filter Removal
IGNITOR
1. Remove upper shell and fan guard (see
page 7).
2. Remove fan (see page 7).
3. Remove 4 side cover screws with a
5/16" nut driver. Remove side cover
(see Figure 9).
4. Disconnect ignitor wires from ignition
control assembly (see Figure 9). Pull
the ignitor wires up through the hole in
the lower shell.
5. Disconnect fuel line hose and air line
hose.Removephotocell from photocell
bracket (see Figure 10).
Figure 10 - Disconnecting Ignitor Wires
from Ignition Control Assembly
Combustion
Chamber
Photocell
Bracket
Ignitor
Ignitor Screw/
Washer
Assembly
Nozzle Adapter
Bracket
Ignitor
Element
Figure 11 - Ignitor Replacement
IGNITION CONTROL
ASSEMBLY
(Procedure for Replacing Fuse)
WARNING: High Voltage
1. Unplug heater
2. Remove side cover screws (4) using
5/16"nut-drivertoexposeignitioncon-
trol assembly.
3. Remove fuse cover.
4. Remove fuse from fuse clips.
5. Replace fuse with fuse of the same type
and rating (GMA-10). Do not substi-
tute a fuse with a higher current rating.
6. Replace fuse cover.
7. Replace side cover.
CAUTION:Donotbendorstrike
ignitor element. Handle with care.
6. Remove combustion chamber. Stand
combustion chamber on end with
nozzle adapter bracket on top (see Fig-
ure 11).
7. Remove ignitor screw with a 1/4" nut
driver. Carefully remove ignitor from
nozzle adapter bracket.
Fuse
Fuse
Cover
Fuse
Clips
Figure 12 - Replacing Fuse
Nozzle Adapter
Bracket Opening
8. Carefully remove replacement ignitor
from styrofoam packing.
9. Carefully guide ignitor into opening in
nozzle adapter bracket. Do not strike ig-
nitor element. Attach ignitor to nozzle
adapter bracket with screw using a 1/4"
nutdriver (seeFigure11).Torque 8to 15
in. lbs. Do not over torque.
10. Replace combustion chamber.
11. Route the ignitor wires back down
through the hole in the lower shell.
Connect wires to the ignition control
assembly.
12. Replace side cover (see Figure 9).
13. Connect and route fuel line hose and air
linehosetonozzleadapter(seeFigure10).
14. Replace photocell in photocell bracket.
Routewireasshown inFigure13,page9.
15. Replace fan (see page 7).
16. Replace fan guard and upper shell (see
page 7).
Combustion
Chamber
Photocell
Bracket
Photocell
Assembly
Air Line
Hose
Fuel
Line
Hose
Ignitor
Wires
Ignitor
Nozzle Adapter Bracket
Ignition
Control
Assembly
Side Cover
•SERVICE DPROCEDURES

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SERVICE
PROCEDURES
Continued
Continued
Figure 13 - Removing Air and Fuel Line
Hoses
NOZZLE ASSEMBLY
1. Remove upper shell (see page 7).
2. Remove fan (see page 7).
3. Remove fuel and air line hoses from
nozzle assembly (see Figure 13).
4. Turn nozzle assembly 1/4 turn to left
and pull toward motor to remove (see
Figure 14).
5. Place plastic hex-body into vise and
lightly tighten.
6. Carefully remove nozzle from the
nozzle adapter using 5/8" socket
wrench (see Figure 15).
7. Blow compressed air through face of
nozzle. This will free any dirt in
nozzle area.
8. Inspect nozzle seal for damage.
9. Replace nozzle into nozzle adapter un-
til nozzle seats. Tighten 1/3 turn more
using 5/8" socket wrench (40-45 inch-
pounds).
10. Attach nozzle assembly to burner strap.
11. Attach and route fuel and airline hoses
to nozzle assembly as shown (see Fig-
ure 13). Route photo cell wires as
shown in Figure 13.
12. Replace fan (see page 7).
13. Replace fan guard and upper shell.
Nozzle/
Adapter
Assembly
Combustion
Chamber
Figure 14 - Removing Nozzle/Adapter
Assembly
Nozzle Face
Nozzle
Nozzle
Seal
Nozzle
Adapter
Air Line Fitting
Fuel Line Fitting
Figure 15 - Nozzle and Nozzle Adapter
Fuel Line
Hose
Nozzle/
Adapter
Assembly
Combustion
Chamber
Air Line Hose
Burner
Strap
Photocell Wires
FUEL AND AIR LINE
REPLACEMENT AND
PROPER ROUTING
1. Remove upper shell (see Upper Shell
Removal, page 7).
2. Remove side cover screws using 5/16"
nut driver (see Figure 9, page 8).
3. Remove side cover.
4. Inspect fuel and air line hoses for cracks
and/orholes.Iffuellinehoseisdamaged,
disconnectfrom nozzle adapter(seeFig-
ure13)andfrom fuelfilter (seeFuel Fil-
ter, page 8). If air line hose is damaged,
disconnectfrom nozzle adapter(seeFig-
ure 13) and from barb fitting on pump
end cover (see Figure 16).
5. Install new air and/or fuel line. Attach
one end of air line hose to barb fitting
on pump end cover (see Figure 16) and
the other end to nozzle adapter (see
Figure 13).Attach one end of fuel line
hose to fuel filter (see Fuel Filter, page
8) and the other end to nozzle adapter
(see Figure 13). Route air and fuel line
approximately as shown in Figure 13.
Note: Route hoses as shown in Figure
13. Hoses are not to touch photocell
bracket.
6. Replace side cover.
7. Replace upper shell and fan guard (see
Upper Shell Removal, page 7).
Figure 16 - Air Hose to Barb Fitting
Barb Fitting Air Hose
Pump End Cover
•SERVICE PROCEDURES

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SERVICE
PROCEDURES
Continued
PUMP ROTOR
(Procedure if Rotor is Binding)
1. Remove upper shell (see page 7).
2. Remove filter end cover screws using
5/16" nut-driver.
3. Remove filter end cover and air filters.
4. Remove pump platescrewsusing5/16"
nut-driver.
5. Remove pump plate.
6. Remove rotor, insert, and blades.
7. Check for debris in pump. If debris is
found, blow out with compressed air.
8. Install insert and rotor.
9. Check gap on rotor. Adjust to .003"/
.004" if needed (see Figure 18).
Note: Rotate rotor one full turn to in-
sure the gap is .003"/.004" at tightest
position. Adjust if needed.
10. Install blades, pump plate, air filters,
and filter end cover.
11. Replace fan guard and upper shell.
12. Adjust pump pressure (see page 7).
Note: If rotor is still binding, proceed
as follows.
13. Perform steps 1 through 6 above.
14. Place fine grade sandpaper (600 grit)
on flat surface. Sand rotor lightly in
“figure 8” motion four times (see Fig-
ure 19).
15. Reinstall insert and rotor.
16. Perform steps 10 through 12 above.
Sandpaper
InsertRotor Air Output
Filter
Blade
Pump Plate
Air Intake Filter
Filter End
Cover
Fan Guard
Figure 17 - Rotor Location
Figure 18 - Gap Adjusting Screw
Locations
Figure 19 - Sanding Rotor
TECHNICAL
SERVICE
You may have further questions about op-
eration or troubleshooting. If so, contact
DESA International’s Technical Service
Department at 1-800-323-5190.
You can also visit DESA International’s
technical service web site at
www.desatech.com.
Note: Use only original replacement parts.
Thiswillprotectyourwarrantycoveragefor
parts replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product.
If they can’t supply original replacement
part(s), call DESA International’s Techni-
cal Service Dept. at 1-800-323-5190.
When calling DESA International, have
ready:
• your name
• your address
• model and serial numbers of your heater
• how heater was malfunctioning
• purchase date
Usually,wewillaskyoutoreturnthedefec-
tive part to the factory.
PARTS NOT UNDER
WARRANTY
Contactauthorized dealersof thisproduct.If
theycan’tsupplyoriginalreplacementpart(s),
call DESA International at 1-800-458-2472
for referral information. Parts Centrals are
listedintheAuthorizedServiceCenterbook-
let supplied with heater.
When calling DESA International, have
ready:
• model number of your heater
• the replacement part number
REPLACEMENT
PARTS
.003"/.004"
Gap
Measured
With
Feeler
Gauge
Blade
Rotor
Gap Adjusting Screw
Gap Adjusting Screw
•SERVICE PROCEDURES
•REPLACEMENT PARTS
•TECHNICAL SERVICE

11
104020
For more information, visit www.desatech.com
Blue
Photocell
Power Plug
120V/60Hz
Ignitor
Ignitor
Blue
White
Red
Yellow Yellow
Green
Motor
White
Black
Black
AC Neutral (L2)
Photocell
Photocell
Motor Return
Motor
AC Hot (L1)
Ignitor
Ignition Control
Assembly
Green
Thermostat
SPECIFICATIONS
Output Rating (Btu/Hr) 70,000
Fuel Use Only Kerosene
or No. 1 Fuel Oil
Fuel Tank Capacity (U.S. Gal.) 5.0
Fuel Consumption (Gal. Per Hr.) .52
Pump Pressure (psi) 4.7
Electric Requirements 120 V/60 Hz
Amperage (Normal Run) 2.8
Hot Air Output (CFM) 360
Motor RPM 3440
Motor HP 1/8
Shipping Weight
(Approximate Pounds) 36
Heater Weight without Fuel
(Approximate Pounds) 31
Figure 20 - Wiring Diagram
WIRING DIAGRAM
ACCESSORIES
Purchase accessories and parts from your
nearest dealer or service center. If they can
not supply these accessories or parts, either
contact your nearest Parts Central or DESA
International for referral information. Parts
CentralsarelistedintheAuthorizedService
Center booklet supplied with heater.
DESA International
P.O. Box 90004
Bowling Green, KY
42102-9004
1-800-458-2472
AIR GAUGE KIT - HA1180
Special tool to check pump pressure.
STANDARD WHEELS AND
HANDLE KIT - HA1206
Makes heater even more portable and con-
venient. Easy to assemble.
HEAVY DUTY WHEELS AND
HANDLE KIT - HA1202
For heavy duty applications. Makes your
heater even more portable and convenient.
IGNITION CONTROL
ASSEMBLY/PHOTOCELL
TESTER - HA1170
Special tool used to test the ignition control
assembly and photocell.
•SPECIFICATIONS
•ACCESSORIES
•WIRING DIAGRAM

12
104020
For more information, visit www.desatech.com
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
34
35
31
32 33
38
37
36
9-2
9-1
9-3
9-4
9-5
9-6
ILLUSTRATED
PARTS
BREAKDOWN
70,000 BTU/HR
H.S.I. SERIES
Motor and Pump Assembly 12-11
12-18
12-17
12-16
12-15
12-14
12-1312-12
12-10
12-1
12-2
12-3 12-4 12-5
12-6
12-7
12-8
12-9
12-19
•ILLUSTRATED PARTS
BREAKDOWN

13
104020
For more information, visit www.desatech.com
PARTS LIST
70,000 BTU/HR
H.S.I. SERIES
This list contains replaceable parts used in your heater. When ordering parts, be sure to provide the correct
model and serial numbers (from the model plate), then the part number and description of the desired part.
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 M51104-01 Handle 1
2 098511-67 Upper Shell (Service Part
Will Be Black) 1
3 M11084-29 Screw, #10-16 x 3/4" 2
4 100647-01 Screw, #10-16 x 1/2" 6
5 098512-51 Combustion Chamber 1
6 M10908-2 Screw, #6-32 x 3/8" 2
7 103154-03 Photocell Bracket 1
8 M16656-24 Photocell Assembly 1
9 ∆Burner Head Assembly 1
9-1 HA3026 Nozzle Assembly 1
9-2 102548-03 Ignitor Kit 1
9-3 104056-01 Nozzle Adapter 1
9-4 102336-01 Nozzle Adapter Bracket 1
9-5 M10908-75 Screw 1
9-6 103347-01 Washer 1
10 107992-01 Screw, #10-16 x 3/8" 2
11 M29678 Fan 1
12 ∆Motor and Pump Assembly 1
12-1 102001-20 Motor 1
12-2 079975-02 Pump Body 1
12-3 M22009** Insert 1
12-4 M22456-1** Rotor 1
12-5 M29608 Pump End Cover 1
12-6 M29632 ⊕ Lint Filter 1
12-7 M29633 ⊕Intake Filter 1
12-8 M29609 Filter End Cover 1
12-9 M12461-31 Screw, #10-32 x 1" 3
12-10 M27694 ∞Adjusting Screw 1
12-11 M10993-1 ∞Pressure Relief Spring 1
12-12 M22997 ∞Plug 1
12-13 M8940 ∞Steel Ball, 1/4" Diameter 1
12-14 M29612-01 ⊕Output Filter 1
12-15 M12461-31 Screw, #10-32 x 1" 6
12-16 103676-01 Nylon Elbow, 90°1
12-17 M8643** Blade 4
KEY PART
NO. NUMBER DESCRIPTION QTY.
∆Not available as an assembly
** Included in Rotor Kit (part No. HA3004)
⊕Included in Filter Kit (Part No. HA3014)
∞Included in Pump Adjustment Kit (Part No. HA3020)
12-18 FHPF3-5C Screw, #10-32 x 5/8" 2
12-19 105780-01 Plastic Cap 1
13 M51105-01 Fan Guard 1
14 098219-38 Power Cord 1
15 M11143-1 Strain Relief Bushing 1
16 NTC-4C Hex Lock Nut, 1/4-20 2
17 107992-01 Screw, #10-16 x 3/8" 4
18 M50631 Rubber Bumper 2
19 097461-09 Side Cover 1
20 101205-01 Motor Bracket 1
21 M50104-06 Bushing 1
22 M11271-8 Clip Nut 6
23 M50104-02 Bushing 1
24 107992-01 Screw, #10-16 x 3/8" 6
25 M10908-14 Screw, #8-32 x 3/8" 1
26 098511-234 Lower Shell (Service Part
Will Be Black) 1
27 M50814-06 Rubber Airline 1
28 079973-01 Fuel Line 1
29 M50876-05 Fuel Filter (with Bushing) 1
30 M10990-3 Rubber Bushing 1
31 M51108-01 Shell Heat-Shield 1
32 102349-01 PCB Support 5
33 104068-02 Ignition Control Assembly 1
34 097702-01 Fuel Cap (Includes Gasket) 1
35 108088-03 Fuel Tank 1
36 097657-03 Thermostat 1
37 M10908-1 Screw, #6-32 x 1/4" 2
38 104905-01 Thermostat Knob 1
PARTS AVAILABLE - NOT SHOWN
100621-06 Thermostat Decal 1
103814-01 Wire Tie (Groups wires 1
connected to Ignition Control
Assembly)
•PARTS LIST

WARRANTY AND REPAIR SERVICE
WARRANTY SERVICE
Should your heater require service, return it to your nearest authorized service center. Proof of purchase must be presented with the heater. The
heater will be inspected. A defect may be caused by faulty materials or workmanship. If so, DESA International will repair or replace the heater
without charge.
REPAIR SERVICE
Returnthe heater toyour nearest authorized service center. Each Service Center is independently owned and operated. Repairs not covered by the
warranty will be billed at standard prices. When writing for information regarding your heater, be sure to include the model number and serial
number as shown on the model plate. We reserve the right to amend these specifications at any time without notice.
Illustrated parts lists can be obtained free of charge. Send a self addressed stamped envelope to the address listed below. List the heater model
numberandthedatelocatedinthe lower right corner of this page. A service manualmaybepurchasedfromtheaddresslistedbelow.Senda check
for $5.00 payable to DESA International.
Corporate Headquarters
2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
www.desatech.com
For information, write: DESA International, P.O. Box 90004
Bowling Green, Kentucky 42102-9004 ATTN: Customer Service Department
When writing, always include model number and serial number.
LIMITED WARRANTY
DESA International warrants this product and any parts thereof, to be free from defects in materials and workmanship for one (1) year
fromthedateoffirstpurchasewhenoperatedandmaintainedinaccordancewithinstructions.Thiswarrantyisextendedonlytotheoriginal
retail purchaser, when proof of purchase is provided.
This warranty covers only the cost of parts and labor required to restore the product to proper operating condition. Transportation and
incidental costs associated with warranty repairs are not reimbursable under this warranty.
Warranty service is available only through authorized dealers and service centers.
This warranty does not cover defects resulting from misuse, abuse, negligence, accidents, lack of proper maintenance, normal wear,
alteration, modification, tampering, contaminated fuels, repair using improper parts, or repair by anyone other than an authorized dealer
or service center. Routine maintenance is the responsibility of the owner.
THIS EXPRESS WARRANTY IS GIVEN IN LIEU OF ANY OTHER WARRANTY EITHER EXPRESSED OR IMPLIED,
INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
DESA International assumes no responsibility for indirect, incidental or consequential damages. Some states do not allow the exclusion
or limitation of incidental or consequential damages or limitations or exclusions may not apply to you. This Limited Warranty gives you
specific legal rights and you may also have other rights which vary from state to state.
Model No.
Serial No.
Date of Purchase
(To be filled in by purchaser)
KEEP THIS WARRANTY
104020-01
Rev. G
03/01
INTERNATIONAL
NOT A UPC
104020 01