Desa H.S.I. Series User manual

IMPORTANT: Read and understand this manual before assembling, starting or servicing
heater.Improperuseofheatercancauseseriousinjury.Keepthismanualforfuturereference.
Heater Size: 55,000 and 60,000 Btu/Hr Model
H.S.I. Series
KEROSENE/DIESEL
PORTABLE FORCED
AIR HEATERS
OWNER’S MANUAL
TABLE OF CONTENTS
SAFETY INFORMATION ............................................................ 2
PRODUCT IDENTIFICATION ..................................................... 3
UNPACKING ............................................................................... 3
THEORY OF OPERATION ......................................................... 3
FUELS......................................................................................... 3
VENTILATION............................................................................. 4
OPERATION ............................................................................... 4
OPERATION WITH PORTABLE GENERATOR.......................... 4
STORING, TRANSPORTING, OR SHIPPING............................ 5
PREVENTATIVE MAINTENANCE SCHEDULE ......................... 5
TROUBLESHOOTING ................................................................ 6
SERVICE PROCEDURES .......................................................... 7
TECHNICAL SERVICE ..............................................................11
REPLACEMENT PARTS ...........................................................11
SPECIFICATIONS .................................................................... 12
WIRING DIAGRAMS................................................................. 12
ACCESSORIES ........................................................................ 13
ILLUSTRATED PARTS BREAKDOWN AND PARTS LIST ....... 14
WARRANTYAND REPAIR SERVICE ........................Back Cover
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Fill In For Your Records
Model No. ___________________
(Located on side panel)
Serial No. ___________________
(Located on fuel tank)
Date of Purchase: ______________

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IMPORTANT: Read this owner’s manual carefully and
completely before trying to assemble, operate, or ser-
vice this heater. Improper use of this heater can cause
serious injury or death from burns, fire, explosion,
electrical shock, and carbon monoxide poisoning.
DANGER: Carbon monoxide poisoning may lead
to death!
Carbon Monoxide Poisoning: Early signs of carbon monoxide
poisoning resemble the flu, with headaches, dizziness, and/or nau-
sea.Ifyouhavethesesigns,theheatermaynotbeworkingproperly.
Getfreshairatonce!Have heater serviced. Somepeoplearemore
affected by carbon monoxide than others. These include pregnant
women, persons 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. Keep this
manual for reference. It is your guide to safe and proper operation
of this heater.
• Use only kerosene, #1#2 diesel/fuel oil, JETAor JP-8 fuels to
avoid risk of fire or explosion. Never use gasoline, naphtha,
paint thinners, alcohol, or other highly flammable fuels.
• Fueling
a)Personnel involved with fueling shall be qualified and thor-
oughly familiar with the manufacturer's instructions and
applicable regulations regarding the safe fueling of heat-
ing units.
b)Only the type of fuel specified on the heater's data plate shall
be used.
c)All flame, including the pilot light, if any, shall be extin-
guished and the heater allowed to cool, prior to fueling.
d)During fueling, all fuel lines and fuel-line connections shall
be inspected for leaks. Any leaks shall be repaired prior to
returning the heater to service.
e)At no time shall more than one day's supply of heater fuel
be stored inside a building in the vicinity of the heater. Bulk
fuel storage shall be outside the structure.
f) All fuel storage shall be located a minimum of 25 feet
(762cm)from heaters, torches, welding equipment, andsimi-
lar sources of ignition (exception: the fuel reservoir integral
with the heater unit).
g)Whenever possible, fuel storage shall be confined to areas
where floor penetrations do not permit fuel to drip onto or
be ignited by a fire at lower elevation.
h)Fuel storage shall be in accordance with the authority hav-
ing jurisdiction.
• Use only the electrical voltage and frequency specified on
model plate.
• Heater must be grounded. Use only a properly grounded three-
wire extension cord. Plug into grounded outlet only.
• Use only in areas free of flammable vapors or high dust content.
• Minimum clearance from any combustible materials: 8 feet
(244 cm) from hot air outlet; 4 feet (122 cm) from top; and 4
feet (122 cm) from sides and inlet.
• Locate heater on a stable and level surface while hot or operat-
ing or a fire may occur.
• Use only in well-vented areas. Before using heater, provide at
least a three-square-foot (2800 square cm) opening of fresh,
outside air for each 100,000 Btu/Hr (30 kw) of rating.
• Keep children and animals away from heater at all times.
• Never start heater when combustion chamber is hot or if fuel
has accumulated in combustion chamber.
• When used with thermostat, heater may start at anytime.
• When heater is moved or stored, it must be in a level position
or fuel spillage may occur.
• Use heater only in accordance with local ordinances and codes.
• Never use gasoline, crankcase drainings, naphtha, paint
thinners, alcohol, or other highly flammable fuels.
• Never use heater where gasoline, paint thinner, or other highly
flammable vapors are present.
• Never use heater in living or sleeping areas.
• Never leave a heater plugged in without adult supervision if
children or animals are likely to be present.
• Never move, handle, refuel, or service a hot, operating, or
plugged-in heater.
• Never attach duct work to front or rear of heater.
• Never attach heater to external fuel tank.
• Heaters used in the vicinity of tarpaulins, canvas, or similar
enclosure materials shall be located a safe distance from such
materials. The recommended minimum safe distance is 10 feet
(304.8cm). It is further recommended that these enclosure ma-
terials be of a fire retardant nature. These enclosure materials
shall be securely fastened to prevent them from igniting or
from upsetting the heater due to wind action.
• Unplug heater when not in use.
• Never block air inlet (rear) or air outlet (front) of heater.
SAFETY INFORMATION
WARNING:Thisproductcontainsand/orgenerates
chemicals known to the State of California to cause
cancer or birth defects, or other reproductive harm.
SAFETY INFORMATION

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Lower
Shell
Side Cover
Fuel
Tank
Upper
Shell
Hot Air
Outlet Handle
Fan Guard
Air Filter
End
Cover
Fuel Cap
Power
Cord
Ignition Control
Assembly (On Inside
of Side Cover)
PRODUCT IDENTIFICATION
Figure 1 - 55/60 Models
UNPACKING
1. Remove all packing items applied to heater for shipment.
2. Remove all items from carton.
3. Check items for any shipping damage. If heater is damaged,
promptly inform dealer where you bought heater.
PRODUCT IDENTIFICATION
UNPACKING
THEORY OF OPERATION
FUELS
Thermostat Knob
(Thermostat Models Only)
Figure 2 - Cross Section Operational View
THEORY OF OPERATION
TheFuelSystem: Theairpumpforcesair throughtheairline. Theair
isthenpushedthroughthenozzle.Thisaircausesfueltobeliftedfrom
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
andaroundthecombustionchamber.Thisairisheatedandprovides
a stream of clean, hot air.
The Ignition System: The ignition control assembly provides
powertotheignitor.Thisignitesthefuel/airmixtureinthecombus-
tion chamber.
The Flame-Out Control System: This system causes the heater to
shut down if the flame goes out.
Clean
Heated
Air Out
Fuel
Filter Air Line To Burner
Air
Output
Filter
Air
Pump
Air Intake
Filter
Cool
Air In
Fan
Combustion
Chamber Ignitor Motor
Ignition
Control
Assembly
Air For Fuel
System Air For
Combustion
And Heating
Fuel
Nozzle
Fuel
Tank
FUELS
Use only kerosene, #1/#2 diesel/fuel oil, JET A or JP-8 fuels.
Heavier fuels such as No. 2 fuel oil or No. 2 diesel fuel may also be
used but will result in:
• noticeable odor
• additional fuel filter maintenance
• the need for nontoxic, anti-icer additives in very cold weather
Do not use fuels heavier than No. 2 grade or heavy oils such as oil
drained from crankcases. These heavy oils will not ignite properly
and will contaminate the heater.
IMPORTANT: UseaKEROSENEONLY(blue)orDIESELONLY
(yellow) storage container. Be sure storage container is clean. For-
eign matter such as rust, dirt, or water will cause the ignition control
assembly to shut down heater. Foreign matter may also require
heater's fuel system to be frequently cleaned.
WARNING: Use only kerosene, #1/#2 diesel/fuel
oil, JET A or JP-8 fuels to avoid risk of fire or explo-
sion. Never use gasoline, oil drained from crank-
cases,naphtha,paintthinners,alcoholorotherhighly
flammable fuels.

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WARNING: Before operating heater or any appli-
ance from a portable generator, verify that generator
has been properly connected to earth ground. Im-
proper grounding or failure to ground generator can
result in electrocution if a ground fault occurs. Refer
to owner’s manual supplied by generator manufac-
turer 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
voltageshouldbeverified(ifgeneratorisequippedwiththeautomatic
idlefeature,theoutputvoltageshouldbemeasuredwiththegenerator
running at full speed). If the voltage does not measure in this range
the heater should not be plugged into the generator.
Refer to Operation for starting, stopping, and resetting heater
procedures.
OPERATION WITH PORTABLE
GENERATOR
Figure 3 - Typical Generator Grounding Method (Generator
construction may vary from that shown)
Ground Lug
Ground Wire (#10 AWG -
Stranded-Copper)
Alternator Copper or Brass
Grounding Point
VENTILATION
OPERATION
OPERATION WITH PORTABLE GENERATOR
VENTILATION
WARNING: Provide a fresh air opening of at least
three square feet (2,800 square cm) for each 100,000
Btu/hr rating. Provide extra fresh air if more heaters
are being used. The minimum ventilation require-
ments must be followed to avoid risks associated
withcarbonmonoxidepoisoning.Makecertainthese
requirements are met prior to operating heater.
Example: A 60,000 Btu/Hr (17.6kw) heater requires one of the
following:
• a two-car garage door [16 feet (4.88 meter) opening] raised 1.5
inches (3.9 cm)
• a single-car garage door [9 feet (2.74 meter) opening] raised
2.5 inches (6.4 cm)
• two, 30 inch (76.2 cm) windows raised 4.5 inches (11.5 cm)
TO START HEATER
1. Follow all ventilation and safety information.
2. Locate heater to provide maximum circulation of the heated
air. Follow all location requirements noted in Safety Informa-
tion, page 2.
3. Fill fuel tank with kerosene, #1#2 diesel/fuel oil, JET A or
JP-8 fuel.
4. Attach fuel cap.
5. For thermostat models, turn thermostat knob clockwise to the
high position.
6. Plug heater’s power cord into approved, grounded, three-wire
extension cord. Extension cord must be at least six feet (1.8
meters) long.
Extension Cord Size Requirement
6 to 10 feet (1.8 to 3 meters) long, use 18 AWG (0.75 mm2)
rated cord
11 to 100 feet (3.3 to 30.5 meters) long, use 16AWG (1.0 mm2)
rated cord
101 to 200 feet (30.8 to 61 meters) long, use 14AWG (1.5 mm2)
rated cord
7. Plug extension cord into standard 120 volt/60 hertz, 3-prong
grounded outlet. Note: Ignitor will preheat for five seconds,
then heater will start.
OPERATION
IMPORTANT: Review and understand the warnings
in the Safety Information section, page 2. They are
needed to safely operate this heater. Follow all local
ordinances and codes when using this heater.
8. For thermostat models, adjust thermostat knob to the desired
setting. Note: Acold heater may affect the thermostat setting.
This thermostat is a general-heating control. It is not intended
for precise temperature control.Adjust thermostat until heater
cycles at the desired setting.
TO STOP HEATER
Unplug extension cord from outlet.
TO RESTART HEATER
1. Unplug extension cord from outlet and wait 10 seconds. (Wait
two minutes if heater has been running.)
2. Repeat steps under To Start Heater.

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PREVENTATIVE MAINTENANCE SCHEDULE
How To
See Storing, Transporting, or Shipping, above
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
WARNING: Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock
can occur.
Item
Fuel tank
Air output and lint filters
Air intake filter
Fuel filter
Ignitor
Fan blades
Motor
How Often
Flushevery150-200hoursofoperationorasneeded
Replaceevery500hoursofoperation or once ayear
Wash and dry with soap and water every 500 hours
of operation or as needed
Clean twice a heating season or as needed
No maintenance required
Clean every season or as needed
Not required/permanently lubricated
STORING, TRANSPORTING,
OR SHIPPING
Note: Ifshipping,transportcompaniesrequirefueltankstobeempty.
1. Drain fuel tank.
Note: Some models have drain plug on underside of fuel tank.
If so, remove drain plug to drain all fuel. If heater does not
have drain plug, drain fuel through fuel cap opening. Be sure
all fuel is removed.
2. Replace drain plug if provided.
3. 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 ex-
cess debris from clogging filters during future use.
4. Replace fuel cap or drain plug. Properly dispose of old and
dirty fuel. Check with local automotive service stations that
recycle oil.
5. 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. Using old fuel could damage heater.
STORING, TRANSPORTING, OR SHIPPING
PREVENTATIVE MAINTENANCE SCHEDULE

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REMEDY
1. Check circuit breaker in electrical panel
2. Turn thermostat knob to a higher setting
3. Check all electrical connections. See
Wiring Diagrams, page 12
4. If fan does not turn freely, see Pump Ro-
tor, pages 10 and 11
5. Replace ignition control assembly
6. Replace motor
7. See Ignition Control Assembly, page 11
1. Fill tank with kerosene
2. See Pump Pressure Adjustment, page 8
3. See Fuel Filter, page 8
4. See Nozzle Assembly, pages 9 and 10
5. Drain and flush fuel tank with clean
kerosene. See Storing, Transporting, or
Shipping, page 5
6. Check electrical connections. See Wir-
ing Diagrams, page 12
7. Replace ignitor, see pages 8 and 9
8. Replace ignition control assembly
1. See Pump Pressure Adjustment, page 8
2. See Air Output, Air Intake, and Lint Fil-
ters, page 7
3. See Fuel Filter, page 8
4. See Nozzle Assembly, pages 9 and 10
5. Make sure photocell boot is properly
seated in bracket
6. Clean photocell lens
7. Check electrical connections. See Wir-
ing Diagrams, page 12
8. Replace photocell
9. Replace ignition control assembly
POSSIBLE CAUSE
1. No power to heater
2. If equipped, thermostat setting istoolow
3. Bad electrical connection between mo-
tor and ignition control assembly or ig-
nition control assembly and power cord
4. Binding pump rotor
5. Defective ignition control assembly
6. Defective motor
7. Blown fuse or ignitor control assembly
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
WARNING: High voltage!
FAULT CONDITION
Motor does not start five seconds after
heater is plugged in
Motorstartsand runsbutheaterdoesnot
ignite
Heater ignites but ignition control as-
sembly shuts heater off after a short
period of time
WARNING: High voltage!
TROUBLESHOOTING
TROUBLESHOOTING
WARNING: Neverserviceheaterwhileitisplugged
in, operating, or hot. Severe burns and electrical
shock can occur.
WARNING: High voltage!

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SERVICE PROCEDURES
WARNING: To avoid risk of burn and electrical
shock, never attempt to service heater while it is
plugged in, operating, or hot.
Upper Shell
Fan
Guard
Figure 4 - Upper Shell Removal
UPPER SHELL REMOVAL
1. Remove screws along each side of heater using 5/16" nut-driver.
These screws attach upper and lower shells together. See Fig-
ure 4.
2. Lift upper shell off.
3. Remove fan guard.
Screw
FAN
IMPORTANT: Remove fan from motor shaft before removing
motorfromheater.Theweightofthemotorrestingonthefancould
damage the fan pitch (see Figure 5).
1. Remove upper shell (see Figure 4).
2. Use 1/8" allen wrench to loosen setscrew which holds fan to
motor shaft.
3. Slip fan off motor shaft.
4. Clean fan using a 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 6).
7. Place setscrew on flat of shaft. Tighten setscrew firmly (40-50
inch-pounds/4.5-5.6 n-m).
8. Replace fan guard and upper shell.
AIR OUTPUT, AIR INTAKE AND LINT FILTERS
1. Remove upper shell (see Figure 4).
2. Remove filter end cover screws using 5/16" nut-driver (see
Figure 7).
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.
Motor
Shaft
Setscrew
Figure 5 - Fan, Motor Shaft,
and Setscrew Location
Motor
Shaft
Fan
Setscrew
Figure 6 - Fan Cross Section
Fan
Flush
Motor
Figure 7 - Air Output, Air Intake, and Lint Filters
Air Intake
Filter
Lint Filter
Filter End
Cover
Air Output
Filter
SERVICE PROCEDURES

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IGNITOR
1. Remove upper shell and fan guard (See Upper Shell Removal,
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 10).
4. Disconnect ignitor wires from ignition control assembly (see
Figure 11). Pull the ignitor wires up through the hole in the
lower shell.
5. Disconnect fuel line hose and air line hose. Remove photocell
from photocell bracket (see Figure 11).
Figure 11 - Disconnecting Ignitor Wires from Ignition Control
Assembly
Combustion
Chamber
Photocell
Bracket
Photocell
Assembly
Air Line Hose
Fuel Line Hose
Ignitor Wire
Ignitor
Nozzle Adapter
Bracket
Ignition
Control
Assembly
Side Cover
Figure 10 - Fuel Filter Removal
Fuel Filter
and Bushing
Side Cover
Upper Fuel Line
SERVICE PROCEDURES
PUMP PRESSURE ADJUSTMENT
1. Remove pressure gauge plug from filter end cover (see Figure 8).
2. Install accessory pressure gauge (part number HA1180).
3. Start heater (see Operation, page 4). Allow motor to reach
full speed.
4. Adjust pressure. Turn relief valve to right to increase pressure.
Turn relief valve to left to decrease pressure. See specifica-
tions correct pressure for each model (see Figure 9).
5. Remove pressure gauge. Replace pressure gauge plug in filter
end cover.
SERVICE PROCEDURES
Continued
Figure 8 - Pressure Gauge Plug Removal
Pressure
Gauge
Plug
Pressure
Gauge
Figure 9 - Adjusting Pump Pressure
Relief
Valve
Pump
Model Pressure
55 3.4 PSI
60 3.4 PSI
FUEL FILTER
1. Remove side cover screws using 5/16" nut-driver.
2. Remove side cover.
3. Pull upper fuel line off fuel filter neck (see Figure 10).
4. Carefully pry bushing and fuel filter out of fuel tank (see Fig-
ure 10).
5. Wash fuel filter with clean fuel and replace in tank.
6. Attach upper fuel line to fuel filter neck.
7. Replace side cover.

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CAUTION: Do not bend or strike ignitor element.
Handle with care.
Photocell
Bracket
Ignitor
Nozzle Adapter
Bracket
Ignitor Element
Combustion
Chamber Nozzle Adapter
Bracket Opening
Figure 12 - Ignitor Replacement
SERVICE PROCEDURES
Continued
SERVICE PROCEDURES
6. Remove combustion chamber. Stand combustion chamber on
end with nozzle adapter bracket on top (see Figure 12).
7. Remove ignitor screw with a 5/16" nut driver. Carefully re-
move ignitor from nozzle adapter bracket.
8. Carefully remove replacement ignitor from packing.
9. Carefully guide ignitor into opening in nozzle adapter bracket.
Do not strike ignitor element.Attach ignitor to nozzle adapter
bracket with screw using a 5/16" nut driver (see Figure 12).
Torque 8 to 15 in-lbs (.90 to 1.69 N-m) Do not over torque.
10. Replace combustion chamber.
11. Routetheignitorwiresback down through the holeinthe lower
shell. Connect wires to the ignition control assembly (see Fig-
ure 11, page 8).
12. Replace side cover (see Figure 10, page 8).
13. Connect and route fuel line hose and air line hose to nozzle
adapter assembly. See Fuel and Air Line Replacement and
Proper Routing, page 10.
14. Replace photocell inphotocellbracket.Routewires as shown in
either (see Figure 13).
15. Replace fan (see page 7).
16. Replace fan guard and upper shell (see page 7).
NOZZLE ASSEMBLY
1. Remove upper shell (see Upper Shell Removal, page 7).
2. Remove fan (see Fan, page 7).
3. Remove fuel and air line hoses from nozzle assembly (see Fig-
ure 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, page 10).
7. Blow compressed air through face of nozzle. This will free
any dirt in nozzle area.
8. Inspect nozzle sleeve for damage.
9. Replace nozzle into nozzle adapter until nozzle seats. Tighten
1/3 turn more using 5/8" socket wrench 40 to 45 in-lbs (4.5 to
5.1 N-m). See Figure 15, page 10.
10. Attach nozzle assembly to burner strap (see Figure 14).
Figure 13 - Removing Air and Fuel Line Hoses
Fuel Line Hose
Air Line
Hose
Nozzle/Adapter
Assembly
Combustion
Chamber
Photocell
Bracket
Nozzle
Adapter
Bracket
Figure 14 - Removing Nozzle/Adapter Assembly
Nozzle/Adapter
Assembly
Combustion
Chamber

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PUMP ROTOR
(Procedure if Rotor is Binding)
1. Remove upper shell (see Upper Shell Removal, page 7).
2. Remove filter end cover screws using 5/16" nut driver (see Fig-
ure 17).
3. Remove filter end cover and air filters.
4. Remove pump plate screws using 5/16" nut-driver.
5. Remove pump plate.
6. Remove rotor, insert, and blades (see Figure 17).
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" (.076/.101 mm) if
needed (see Figure 18).
Note: Rotate rotor one full turn to ensure the gap is .003"/.004"
(.076/.101 mm) at tightest position.Adjust if needed.
10. Install blades, pump plate, air filters, and filter end cover.
11. Replace fan guard and upper shell (see Upper Shell Removal,
page 7).
12. Adjust pump pressure (see Pump PressureAdjustment, page 8).
Note: If rotor is still binding, proceed as follows.
Figure 17 - Rotor Location
Pump Plate
Insert Rotor
Blade
Filter End
Cover
Air Intake Filter
Air Output Filter
Gap Adjusting Screw
Rotor
Blade
.003"/.004"
(.076-.101 mm)
Gap Measured
With Feeler
Gauge
Gap Adjusting Screw
Figure 18 - Gap Adjusting Screw Locations
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
10, page 8).
3. Remove side cover.
4. Inspect fuel and air line hoses for cracks and/or holes. If fuel line
hose is damaged, disconnect from nozzle adapter (see Figure 12,
page 9) and from fuel filter (see Fuel Filter, page 8). If air line
hose is damaged, disconnect from nozzle adapter (see Figure 12,
page 9) 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 12, page 9).Attach one end of
fuel line hose to fuel filter (see Fuel Filter, page 8) and the other
end to nozzle adapter (see Figure 12, page 9).
Note: Route hoses as shown in see Figure 12, page 9. 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
Air Hose
Pump End Cover
Barb
Fitting
SERVICE PROCEDURES
Continued
SERVICE PROCEDURES
Figure 15 - Nozzle and Nozzle Adapter
Nozzle
Face
Nozzle
Nozzle Sleeve
Nozzle Adapter
Air Line
Fitting Fuel Line Fitting
11. Attach fuel and airline hoses to nozzle assembly. See Fuel and
Airline Replacement and Proper Routing.
12. Replace fan (see Fan, page 7).
13. Replace fan guard and upper shell (see Upper Shell Removal,
page 7).

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SERVICE PROCEDURES
Continued
Sandpaper
Figure 19 - Sanding Rotor
SERVICE PROCEDURES
TECHNICAL SERVICE
REPLACEMENT PARTS
13. Perform steps 1 through 6.
14. Place fine grade sandpaper (600 grit) on flat surface. Sand ro-
tor lightly in “figure 8” motion four times (see Figure 19).
15. Reinstall insert and rotor.
16. Perform steps 10 through 12.
IGNITION CONTROL ASSEMBLY
WARNING: High voltage!
Figure 20 - Replacing Fuse
Fuse
Fuse
Cover
Fuse Clips
1. Unplug heater.
2. Remove side cover screws (4) using 5/16" nut-driver to ex-
pose ignition control assembly.
3. Remove fuse cover (see Figure 20).
4. Remove fuse from fuse clips (see Figure 20).
5. Replace with new fuse (DESA Heating Products part number
105880-02). Do not substitute a fuse with a higher current rat-
ing. Use Bussmann GMA-10 or equivalent.
6. Replace fuse cover (see Figure 20).
7. Replace side cover (see Figures 10, page 8).
TECHNICAL SERVICE
You may have further questions about installation, operation, or
troubleshooting. If so, contact DESA Heating Products’ 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 Products’ technical services web
site at www.desatech.com.
REPLACEMENT PARTS
Note: Use only original replacement parts. This will protect your
warranty coverage for parts replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product. If they can’t supply
originalreplacement part(s), call DESA HeatingProducts’Techni-
cal Service Dept. at 1-866-672-6040.
When calling DESA Heating Products, have ready:
• your name
• your address
• model and serial numbers of your heater
• how heater was malfunctioning
• purchase date
Usually, we will ask you to return the part to the factory.
PARTS NOT UNDER WARRANTY
Contactauthorizeddealersofthisproduct.Iftheycan’t supplyoriginal
replacement part(s), call DESA Heating Products at 1-866-672-6040
for referral information. Parts dealers are listed in the Authorized
Service Center booklet supplied with heater.
When calling DESA Heating Products, have ready:
• model and serial numbers of your heater
• the replacement part number

112846-01A
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For more information, visit www.desatech.com
Power Plug
120V/60Hz
Blue
Blue
White
White
Photocell
Ignition Control Assembly
Green
Green
Red
Black
Black
Motor
Thermostat
Photocell
Photocell
Ignitor
Motor Return
AC Neutral (L2)
120V (L1)
Ignitor
Motor
White
White
Ignitor
Figure 22 - Wiring Diagram with Thermostat
WIRING DIAGRAMS
SPECIFICATIONS
WIRING DIAGRAMS
Power Plug
120V/60Hz
Blue
Blue
White
White
Photocell
Green
Green
Red
Black
White
White
Motor
Ignitor
Ignition Control Assembly
Photocell
Photocell
Ignitor
Motor Return
AC Neutral (L2)
120V (L1)
Ignitor
Motor
Figure 21 - Wiring Diagram without Thermostat
Output Rating (Btu/Hr) 55,000/60,000
Fuel Use only kerosene, #1/#2 diesel/fuel oil, JET A or JP-8 fuels*
Fuel Tank Capacity (U.S. Gal./Liters) 5/18.9
Fuel Consumption (Gal. Per Hr/Liters Per Hr) .44/1.67
Pump Pressure (psi) 3.4
Electric Requirements 120 V/60 HZ
Amperage (Normal Run) 2.0
Motor RPM 1725
Hot Air Output (CFM) 180
Motor HP 1/15
Shipping Weight 33/15
(Approximate Pounds/Kilograms)
Heater Weight without Fuel 29/13.1
(Approximate Pounds/Kilograms)
* Use of #2 diesel & fuel oil will result in noticeable odor and could require additional fuel filter maintenance. Use in extreme cold
temperatures may require nontoxic anti-icer additives.
SPECIFICATIONS

112846-01A
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ACCESSORIES
ACCESSORIES
Purchase accessories and parts from your nearest dealer or service
center. If they can not supply these accessories or parts, either contact
yournearestpartsdealerorDESAHeatingProductsat1-866-672-6040
for referral information. Parts Centrals are listed in the Authorized
Service Center booklet supplied with heater.
HEAVY DUTY WHEELS AND HANDLE KIT
HA1202
For all models. For heavy duty applications. Makes your heater
even more portable and convenient.
AIR GAUGE KIT - HA1180
For all models. Special tool to check pump pressure.
STANDARD WHEELS AND HANDLE KIT
HA1206
For all models. Makes heater even more portable and convenient.
Easy to assemble.
IGNITION CONTROL ASSEMBLY/PHOTOCELL
TESTER - HA1170
Specialtoolusedtotesttheignitioncontrolassemblyandphotocell.
THERMOSTAT KIT - HA1210
Keeps your building at the temperature you select day and night.
Helps economize on fuel.
FUEL TANK FILLER NECK SCREEN - HA2210
Thisscreen/filterdropsinfuel tank filler neck. This prefilter allows
for easy cleaning and provides two-stage filtering advantage.

112846-01A
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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
33
34
35
31 32
38
37
39
36
9-2
9-1
9-3
9-4
ILLUSTRATED PARTS
BREAKDOWN
55/60 MODELS
Motor and Pump Assembly
12-11
12-18
12-17
12-16
12-1512-14 12-13
12-12
12-10
12-1
12-3
12-4
12-5
12-6
12-7 12-8
12-9
12-2
12-19
ILLUSTRATED PARTS BREAKDOWN
55/60 Models
Standard Thermostat
Models Models
R60H R55BTH
B55BTH

112846-01A
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PARTS LIST
55/60 MODELS
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.
PARTS LIST
55/60 Models
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 M51104-01 Handle 1
2 098511-67 Upper Shell (Service Part 1
Will Be Black)
3 M11084-29 Screw, #10-16 x 3/4" 2
4 M15823-27 Screw, #10-16 x 1 1/2" 6
5 098512-76 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
9-1 HA3024 Nozzle Assembly 1
9-2 102548-08 Ignitor Kit 1
9-3 104056-01 Nozzle Adapter 1
9-4 102336-05 Nozzle Adapter Bracket 1
10 M11084-26 Screw, #10-16 x 3/8" 2
11 103684-01 Fan 1
12 ∆Motor and Pump Assembly
12-1 102001-28 Motor 1
12-2 079975-03 Pump Body 1
12-3 M22009** Insert 1
12-4 M22456-2** 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 M12461-32 Screw, #10-32 x 1 1/8" 6
12-16 103676-01 Nylon Elbow, 90°1
12-17 M8643-2** Blade 4
12-18 FHPF3-6C Screw, #10-32 x 3/4" 2
12-19 105780-01 Plastic Cap 1
KEY PART
NO. NUMBER DESCRIPTION QTY.
∆Not available as an assembly ⊕ Included in Filter Kit (Part No. HA3014)
** Included in Rotor Kit (Part No. HA3005) ∞ Included in Pump Adjustment Kit (Part No. HA3020)
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 M11084-26 Screw, #10-16 x 3/8" 8
18 M50631 Rubber Bumper 2
19 097461-16 Side Cover 2
20 101205-01 Motor Bracket 1
21 M50104-06 Bushing 1
22 M11271-8 Clip Nut 6
23 M50104-02 Bushing 1
24 M11084-26 Screw, #10-16 x 3/8" 6
25 M10908-14 Screw, #8-32 x 3/8" 1
26 098511-234 Lower Shell (Service Part 1
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 102349-01 PCB Support 5
32 104068-02 Ignition Control Assembly 1
33 097702-01 Fuel Cap (Includes Gasket) 1
34 108088-03 Fuel Tank 1
35 M51108-01 Shell Heat-Shield 1
36 104458-01 Thermostat 1
37 M12461-18 Screw, #8-32 x 7/8" 1
38 104460-01 Thermostat Knob 1
39 WLE-2 Lock Washer, EXT #8 1
PARTS AVAILABLE - NOT SHOWN
103814-01 Wire Tie (For Ignition
Control Assembly) 1
M9900-170 Wire Assembly
(Thermostat to Ignition
Control Assembly) 1

112846-01A
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For more information, visit www.desatech.com
NOTES
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112846-01A
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1. Who will heater be used by? ❍ Individual ❍ Business
2. Will you use your heater in more than one location? ❍ Yes ❍ No
3. Where will the product be used? (You may select more than one.) ❍ Workshop ❍ Barn ❍ Residential Construction
❍ Commercial Construction ❍ Garage ❍ Factory ❍ Recreation ❍ Warehouse ❍ Utility Shed/Outbuilding
❍ Other ______________________________ (Specify)
4. Cost of product (excluding sales tax)? $________________________________
5. Maintenance/service work will be performed by: ❍ Self ❍ Service Center ❍ Other ___________________________________
6. If you bought this product yourself, did you plan to purchase this type of product before going into the store? ❍ Yes ❍ No
7. Type of store where product was purchased? ❍ Hardware ❍ Propane Dealer ❍ Natural Gas/Utility Co. ❍ Home Center or Builder’s Supply
❍ Farm/Ag. Supply ❍ Auto Parts ❍ Warehouse Club ❍ Industrial/Contractor Supply ❍ Rental Store
❍ Discount Store ❍ HVAC Dealer ❍ Other _________________________________________________
8. What is your primary source of heat? ❍ Propane (LP Gas) ❍ Natural Gas ❍ Kerosene ❍ Diesel ❍ Electric ❍ Other________________
9. What motivated you to buy this product? ❍ Sudden Cold Weather ❍ Replace Older Model ❍ D.I.Y. Home Project ❍ Emergency Back-Up Heat
❍ Heater on Sale ❍ Construction Project ❍ Hard to Heat Location ❍ Other ________________________________
10. How did you learn about this product brand? ❍ Advertisement ❍ Relative or Friend ❍ Co-Worker ❍ Store Representative
❍ Store Display ❍ Previously Owned a Heater ❍ Other _________________________________________________(Specify)
11. What other brands did you consider? ❍ None ❍ Master ❍ Remington ❍ All-Pro ❍ Dayton ❍ Universal ❍ Mr. Heater ❍ L.B.White Tradesman
❍ John Deere ❍ Dyna-Glo ❍ Dura-Heat ❍ Paulin ❍ Coleman ❍ Vogelzang American ❍ Other ___________________________________
12. Who selected the product? ❍Male ❍Female ❍Both
13. Level of Education of Purchaser: ❍ High School ❍ Vocation/Technical School ❍ Some College ❍ Completed College ❍ Graduate School
14. Age of Purchaser: ❍ Under 20 ❍ 20 - 29 ❍ 30 - 39 ❍ 40 - 49 ❍ 50 - 59 ❍ 60 or Over
15. Buyer’s total annual household income: ❍ Under $19,999 ❍ $20,000 to $34,999 ❍ $35,000 to $49,999
❍ $50,000 to $74,999 ❍ $75,000 to $99,999 ❍ $100,000 and Over
16. What is the population of your area? ❍ Under 10,000 ❍ 10,000 to 25,000 ❍25,000 to 50,000 ❍ 50,000 to 100,000
❍ 100,000 to 250,000 ❍ Over 250,000
17. Store where product was purchased:
Name: ______________________________________ City: _____________________________________ State: __________
18. In choosing this product, how important were the following:
Availability
Price
Brand Name
Overall Quality
Heat Output (Btu/Hr Rating)
Variable Heat Output (Btu/Hr)
Made in USA
Warranty
Local Service
Value for Price
19. This question will allow us to better understand the demographic profile of our customers.Which of the following best describes you? (not required)
❍ African American ❍ Asian American ❍ Mexican ❍ Puerto Rican ❍ Cuban ❍ Other Hispanic ❍ White ❍ Other ___________________
Brand: (Reddy Heater, Master, Remington, etc.)
Model: (R60, HD15, etc.)
Date Purchased: Note: Keep receipt for warranty verification.
Serial Number: 7 or 9 digit number located on product or identification tag.
First Name: Last Name:
Address:
City: State: Zip: Country:
Phone: ( ) - E-Mail:
OWNER'S REGISTRATION FORM
Please answer the following questions to register your product with DESA Heating Products:
Complete registration form and mail or complete on-line registration at www.desatech.com within 30 days after purchase.
Not Somewhat Very
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
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Not Somewhat Very
❍
❍
❍
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❍
❍
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❍
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Size
Prior Brand Experience
Built-In Thermostat
Ease of Operation
Special Features
Salesperson’s Recommendation
Friend/Relative’s Recommendation
Portability
Quiet Operation

2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
Postage
Required

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WARNING
PROPANE/LP FORCED AIR HEATERS
PROPANE/LP TANK TOP HEATERS
PROPANE/LP AND NATURAL
GAS GARAGE HEATERS
PROPANE/LP CONVECTION HEATERS
PORTABLE KEROSENE/DIESEL
FORCED AIR HEATERS
PROPANE/LP
PATIO HEATERS PROPANE/LP AND NATURAL GAS CHIMENEAS
OTHER OUTDOOR HEATING PRODUCTS

112846-01A
20
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WARRANTY AND REPAIR SERVICE
Printed in U.S.A.
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
heaterwillbeinspected.Adefectmaybecausedbyfaultymaterialsorworkmanship.Ifso,DESAHeatingProductswillrepairorreplacetheheater
without charge.
REPAIR SERVICE
Returntheheater to yournearestauthorized service center.Each Service Centerisindependently owned andoperated. Repairs notcoveredby the
warranty will be billed at standard prices. 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
numberand thedatelocatedinthelowerright cornerof thispage. Aservice manualmay bepurchasedfromtheaddresslistedbelow.Sendacheck
for $5.00 payable to DESA Heating Products.
When writing for information regarding your heater, be sure to include the model number and serial number as shown on the model plate.
For more information about this warranty, write:
LIMITED WARRANTY
DESA Heating Products warrants this product and any parts thereof, to be free from defects in materials and workmanship for one (1) year from
the date of first purchase when operated and maintained in accordance with instructions. This warranty is extended only to the original 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 Heating Products 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.
2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
www.desatech.com