Desa H.S.I. User Manual
KEROSENE/DIESEL
PORTABLE FORCED
AIR HEATERS
OWNER’S MANUAL
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New
Straight
Shell
Design
Heater Sizes: 40,000 55,000 60,000 70,000 110,000 115,000
155,000 165,000 and 200,000 Btu/Hr Models
H.S.I. Series
IMPORTANT: Read and understand this manual before assembling, starting or servicing
heater. Improper use of heater can cause serious injury. Keep this manual for future reference.
TABLE OF CONTENTS
SAFETY INFORMATION ............................................................ 2
PRODUCT IDENTIFICATION ..................................................... 3
UNPACKING ............................................................................... 3
THEORY OF OPERATION ......................................................... 4
FUELS......................................................................................... 4
VENTILATION............................................................................. 4
ASSEMBLY ................................................................................. 5
OPERATION ............................................................................... 5
OPERATION WITH PORTABLE GENERATOR .......................... 6
STORING, TRANSPORTING, OR SHIPPING............................ 6
PREVENTATIVE MAINTENANCE SCHEDULE ......................... 6
TROUBLESHOOTING ................................................................ 7
SERVICE PROCEDURES.......................................................... 8
TECHNICAL SERVICE ............................................................. 15
REPLACEMENT PARTS .......................................................... 15
SPECIFICATIONS .................................................................... 16
WIRING DIAGRAMS................................................................. 16
ILLUSTRATED PARTS BREAKDOWN AND PARTS LIST ....... 18
WHEELS AND HANDLES ........................................................ 24
ACCESSORIES ........................................................................ 25
OWNER'S REGISTRATION FORM .......................................... 27
WARRANTY AND REPAIR SERVICE ........................ Back Cover
Fill In For Your Records
Model No. ___________________
(Located on side panel)
Serial No. ___________________
(Located on fuel tank)
Date of Purchase: ______________
Save this manual for future reference.
Save this manual for future reference.
®
SAFETY INFORMATION
2
SAFETY INFORMATION
WARNINGS
WARNING: This product contains 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 headaches, dizziness, and/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, 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, JET A or 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 heating 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 762cm (25
feet) from heaters, torches, welding equipment, and similar
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 threewire 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 operating or a fire may occur.
• Use only in well-vented areas. Before using heater, pro vide at
least a 2800 square cm (three-square-foot) opening of fresh,
outside air for each 30 kw (100,000 Btu/Hr) 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
304.8cm (10 feet). It is further recommended that these enclosure materials 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.
• Warning to New York City Residents
For Use Only At Construction Sites in accordance with ap-
plicable NYC codes under NYCFD certificate of approval
#4803, #4899, #4908, #4909, or #4934.
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111167-01C
PRODUCT IDENTIFICATION
Hot Air
Outlet
Upper
Shell
Handle
Thermostat Knob
(Thermostat Models Only)
Fan Guard
Hot Air
Outlet
PRODUCT IDENTIFICATION
UNPACKING
Thermostat Knob
Upper Shell
(Thermostat Models Only)
Fan Guard
3
3
Lower
Shell
Fuel
Tank
Side Cover
Ignition Control
Assembly (On Inside
of Side Cover)
Power
Cord
Figure 1 - 40/55/60/70 Models
Hot Air Outlet
Lower
Shell
Fuel
Cap
Fuel Cap
Upper Shell
Air Filter
End
Cover
Fan
Guard
Lower
Shell
Fuel Cap
Side Cover
Figure 3 - 200 Model
Ignition Control
Assembly (On Inside
of Side Cover)
Fuel Tank
Power Cord
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.
Side Cover
Ignition Control
Assembly (On Inside
of Side Cover)
Figure 2 - 110/115/155/165 Models
111167-01C
Power Cord
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Fuel Tank
Thermostat
Knob
(Thermostat
Models Only)
THEORY OF OPERATION
4
FUELS
VENTILATION
THEORY OF OPERATION
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 be lifted 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.
Clean
Heated
Air Out
Fuel
Tank
Combustion Chamber
Nozzle
Air For Fuel System
Ignitor
Fuel
Filter
Air For Combustion
And Heating
Motor
Fan
Air Line
To Burner
The Ignition System: The ignition control assembly provides
power to the ignitor. This ignites the fuel/air mixture in the combustion chamber.
The Flame-Out Control System: This system causes the heater to
shut down if the flame goes out.
Air Pump
Air Intake
Filter
Cool
Air
In
Air
Output
Filter
Ignition Control
Assembly
Fuel
Figure 4 - Cross Section Operational View
FUELS
WARNING: Use only kerosene, #1/#2 diesel/fuel
oil, JET A or JP-8 fuels to avoid risk of fire or explosion. Never use gasoline, oil drained from crankcases, naphtha, paint thinners, alcohol or other highly
flammable 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:
(yellow ) storage container. Be sure storage container is clean. Foreign 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.
Use a KEROSENE ONLY (blue) or DIESEL ONLY
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 requirements must be followed to avoid risks associated
with carbon monoxide poisoning. Make certain these
requirements are met prior to operating heater.
Example:
following:
• a two-car garage door [4.88 meter (16 feet) opening] raised
12.7 cm (5 inches)
• a single-car garage door [2.74 meter (9 feet) opening] raised
20.3 cm (8 inches)
• two, 76.2 cm (30 inch) windows raised 38.1 cm (15 inches)
A 58.6kw (200,000 Btu/Hr) heater requires one of the
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111167-01C
ASSEMBLY
OPERATION
5
5
ASSEMBLY
(FOR 110/115/155/165/200 MODELS ONLY)
These models are furnished with wheels and a rear handle. Some
models are furnished with a front handle also. Wheels, handle(s),
and the mounting hardware are found in the shipping carton.
Tools Needed
• Medium Phillips Screwdriver
• 3/8" Open or Adjustable Wrench
• Hammer
1. Slide axle through wheel support frame. Install wheels on axle.
IMPORTANT:
wheels toward wheel support frame (see Figure 5).
2. Place cap nuts on axle ends. Gently tap with hammer to secure.
3. Place heater on wheel support frame. Make sure ho t a ir out let
end (fron t ) of heater is over wheels. Line up holes on fuel tank
flange with holes on wheel support frame.
4. Place rear handle (and front handle if provided) on top of fuel
tank flange. Insert screws through handle(s), fuel tank flange,
and wheel support frame. Attach nut finger tight after each
screw is inserted.
5. After all screws are inserted, tighten nuts firmly.
Front Handle
(If Provided)
Hot Air
Outlet
Fuel Tank
Flange
When installing wheels, point e xtended hub of
Handle
Screw
Air
Inlet
OPERATION
IMPORTANT: Review and understand the warnings
in the
needed to safely operate this heater. Follow all local
ordinances and codes when using this heater.
TO START HEATER
1. Follow all ventilation and safety information.
2. Locate heater to provide maximum circulation of the heated
3. Fill fuel tank with kerosene, #1#2 diesel/fuel oil, JET A or
4. Attach fuel cap.
5. For thermostat models, turn thermostat knob clockwise to the
6. Plug heater’s power cord into approved, grounded, three-wire
7. Plug extension cord into standard 120 volt/60 hertz, 3-prong
8. For thermostat models, adjust thermostat knob to the desired
Safety Information
air. Follow all location requirements noted in Safety Information, page 2.
JP-8 fuel.
high position.
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 16 AWG (1.0 mm2)
rated cord
101 to 200 feet (30.8 to 61 meters) long, use 14 AWG (1.5 mm2)
rated cord
grounded outlet.
then heater will start.
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.
Note:
Note:
A cold heater may af fect the thermostat setting.
section, page 2. They are
Ignitor will preheat for five seconds,
Wheel
Support
Wheel
Cap Nut
Figure 5 - Wheel and Handle Assembly, 110/115/155/165/200
Models Only
111167-01C
Frame
Nut
Axle
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Extended
Hub
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.
OPERATION WITH PORTABLE GENERATOR
6
STORING, TRANSPORTING, OR SHIPPING
PREVENTATIVE MAINTENANCE SCHEDULE
OPERATION WITH PORTABLE
GENERATOR
WARNING: Before operating heater or any appliance from a portable generator, verify that generator
has been properly connected to earth ground. Improper grounding or failure to ground generator can
result in electrocution if a ground fault occurs. Refer
to owner’s manual supplied 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 equipped with the automatic
idle feature, the output voltage should be measured with the generator
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, page 5, for starting, stopping, and resetting
heater procedures.
Alternator
Ground Lug
Copper or Brass
Grounding Point
STORING, TRANSPORTING,
OR SHIPPING
Note:
If shipping, transport companies require fuel tanks to be empty.
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 excess 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:
during next heating season. Using old fuel could damage heater.
Do not store kerosene over summer months for use
Ground Wire (#10 AWG Stranded-Copper)
Figure 6 - Typical Generator Grounding Method (Generator
construction may vary from that shown)
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 and lint filters
Air intake filter
Fuel filter
Ignitor
Fan blades
How Often
Flush every 150-200 hours of operation or as needed
Replace every 500 hours of operation or once a year
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
How To
See Storing, Transporting, or Shipping, above
See Air Output, Air Intake, and Lint Filters, page 8
See Air Output, Air Intake, and Lint Filters, page 8
See Fuel Filter, pages 9 and 10
See Fan, page 8
Motor
Not required/permanently lubricated
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111167-01C
TROUBLESHOOTING
WARNING: Never service heater while it is plugged
in, operating, or hot. Severe burns and electrical
shock can occur.
TROUBLESHOOTING
7
7
FAULT CONDITION
Motor does not start five seconds after
heater is plugged in
Motor starts and runs but heater does not
ignite
POSSIBLE CAUSE
1. No power to heater
2. If equipped, thermostat setting is too low
WARNING: High voltage!
3. Bad electrical connection between motor and ignition control assembly or ignition 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
WARNING: High voltage!
6. Bad electrical connection between ignitor and ignition control assembly
7. Defective ignitor
8. Defective ignition control assembly
9. 200 Model Only: Defective fuel valve
(Models equipped with fuel valve only)
REMEDY
1. Check circuit breaker in electrical panel
2. Turn thermostat knob to a higher setting
3. Check all electrical connections. See
Wiring Diagrams, pages 16 and 17
4. If fan does not turn freely , see Pump Ro-
tor, page 14
5. Replace ignition control assembly
6. Replace motor
7. See Ignition Control Assembly, page 15
1. Fill tank with kerosene
2. See Pump Pressure Adjustment, page 9
3. See Fuel Filter, pages 9 and 10
4. See Nozzle Assembly, pages 12 and 13
5. Drain and flush fuel tank with clean
kerosene. See Storing, T ransporting , or
Shipping, page 6
6. Check electrical connections. See Wir-
ing Diagrams, pages 16 and 17
7. Replace ignitor, see page 11
8. Replace ignition control assembly
9. See Fuel Valve, page 10
Heater ignites but ignition control assembly shuts heater off after a short
period of time
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111167-01C
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 installed (not seeing the flame)
6. Dirty photocell lens
WARNING: High voltage!
7. Bad electrical connection between photocell and ignition control assembly
8. Defective photocell
9. Defective ignition control assembly
1. See Pump Pressure Adjustment, page 9
2. See Air Output, Air Intake, and Lint Fil-
ters, page 8
3. See Fuel Filter, pages 9 and 10
4. See Nozzle Assembly, pages 12 and 13
5. Make sure photocell boot is properly
seated in bracket
6. Clean photocell lens
7. Check electrical connections. See Wir-
ing Diagrams, pages 16 and 17
8. Replace photocell
9. Replace ignition control assembly
SERVICE PROCEDURES
8
SERVICE PROCEDURES
WARNING: To avoid risk of burn and electrical
shock, never attempt to service heater while it is
plugged in, operating, or hot.
Setscrew
Fan
Motor
Setscrew
Fan
UPPER SHELL REMOVAL
1. Remove screws along each side of heater using 5/16" nut-dri ver .
These screws attach upper and lower shells together. See Figure 7 or 8.
2. Lift upper shell off.
3. Remove fan guard.
Screw
Upper Shell
Fan
Guard
Figure 7 - Upper Shell
Removal, 40/50/60/70
Models Only
Figure 8 - Upper Shell
Removal, 110/115/155/165/200
Models Only
Screw
Upper Shell
Fan
Guard
FAN
Flush
Motor
Shaft
Figure 9 - Fan, Motor Shaft,
and Setscrew Location
Figure 10 - Fan Cross Section
Motor
Shaft
AIR OUTPUT, AIR INTAKE AND LINT FILTERS
1. Remove upper shell (see Figure 7 or 8).
2. Remove filter end cover screws using 5/16" nut-driver (see
Figure 11 or 12).
3. Remove filter end cover.
4. Replace air output and lint filters.
5. W ash or replace air intake filter (see Pr eventative Maintenance
Schedule, page 6).
6. Replace filter end cover.
7. Replace fan guard and upper shell.
IMPORTANT:
Do not oil filters.
Air Intake
Filter
Filter End
Cover
IMPORTANT:
Remove fan from motor shaft before removing
motor from heater. The weight of the motor resting on the fan could
damage the fan pitch (see Figure 9).
1. Remove upper shell (see Figure 7 or 8).
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 10).
7. Place setscrew on flat of shaft. T ighten setscre w firmly (40-50
inch-pounds/4.5-5.6 n-m).
8. Replace fan guard and upper shell.
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Lint Filter
Air Output
Filter
Figure 11 - Air Output, Air Intake, and Lint Filters, 40/55/60/70
Models Only
Air Intake
Filter
Filter End
Cover
Lint Filter
Air Output Filter
Figure 12 - Air Output, Air Intake, and Lint Filters, 110/115/155/
165/200 Models Only
111167-01C
SERVICE PROCEDURES
Continued
SERVICE PROCEDURES
9
9
PUMP PRESSURE ADJUSTMENT
1. Remove pressure gauge plug from filter end cover (see Figure 13).
2. Install accessory pressure gauge (part number HA1180).
3. Start heater (see Operation, page 5). Allow motor to reach
full speed.
4. Adjust pressure. Tur n relief valve to right to increase pressure.
Turn relief valve to left to decrease pressure. See specifications correct pressure for each model (see Figure 14).
5. Remove pressure gauge. Replace pressure gauge plug in filter
end cover.
Pressure
Gauge
Plug
Figure 13 - Pressure Gauge Plug Removal (40/55/60/70 Models
Shown)
Pump
Model Pressure
40 3.0 PSI
55 3.4 PSI
60 3.4 PSI
70 4.7 PSI
110 5.1 PSI
115 5.1 PSI
155 5.2 PSI
165 5.6 PSI
200 6.2 PSI
Pressure
Gauge
Relief
Valve
Fuel Filter
and Bushing
Upper Fuel Line
Side Cover
Figure 15 - Fuel Filter Removal, 40/55/60/70 Models
Fuel Filter, Bushing,
and Lower Fuel Line
Side
Cover
Figure 14 - Adjusting Pump Pressure (40/55/60/70 Models Shown)
FUEL FILTER
(For 40/55/60/70/110/115/155/165 Models Only)
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 15 or 16).
4. Carefully pry bushing, fuel filter , and lower fuel line (110/115/
155/165 Models only) out of fuel tank (see Figure 16).
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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111167-01C
Upper Fuel Line
Figure 16 - Fuel Filter Removal, 110/115/155/165 Models
10
SERVICE PROCEDURES
SERVICE PROCEDURES
Continued
(For 200 Model Only)
1. Remove side cover screws using 5/16" nut-driver.
2. Remove side cover (see Figure 17).
3. Pull low er fuel line of f the fuel v alve fitting (se e Figu re 17) .
Note:
See Figure 16, page 9 if your model does not come
equipped with a fuel valve.
4. Carefully pry bushing, lower fuel line, and fuel filter out of
fuel tank.
5. Wash fuel filter with clean fuel and replace in tank.
6. Attach lower fuel line to fuel valve fitting.
7. Replace side cover.
Bushing, Lower Fuel
Line, and Fuel Filter
Screw
FUEL VALVE
For 200 Models Equipped with Fuel Valve
1. Remove side cover (see Figure 17), fan guard, and upper
shell (see Figure 8, page 8) screws using 5/16" nut-driver.
2. Remove fan (see Fan, page 8).
3. Pull lower fuel line off the fuel valve fitting (see Figure 18).
WARNING: High Voltage
4. Disconnect red and white wires from fuel valve (see Figure 18).
5. Using 1/4" nut driver remove 2 screws holding fuel valve and
bracket to lower shell (see Figure 18). Save these screws.
6. Using 1/4" nut driver remove 2 screws holding fuel valve to
bracket. Save these screws.
7. Attach new fuel valve to bracket with 2 screws.
8. Install new fuel valve and bracket on lower shell with 2 screws.
9. Connect red and white wires (polarity not important). Connect
upper and lower fuel lines to fuel valve (see Figure 18).
10. Replace fan, fan guard, upper shell, and side cover.
Valve Fittings
Fuel Valve
Electrical Wires
Screw
Side Cover
Figure 17 - Fuel Filter Removal, 200 Model Only (Model with Fuel
Valve Assembly Shown)
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Fuel Valve Fitting
Bracket
Screw
Lower Fuel Line
Figure 18 - Fuel Valve Replacement, 200 Model Only
111167-01C
SERVICE PROCEDURES
Continued
IGNITOR
1. Remove upper shell and fan guard (See Upper Shell Removal,
page 8).
2. Remove fan (see page 8).
3. Remove 4 side cover screws with a 5/16" nut driver. Remove
side cover (see Figures 15 or 16, page 9 or Figure 17, page 10).
4. Disconnect ignitor wires from ignition control assembly (see
Figure 19). 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 19).
6. Remove combustion chamber. Stand combustion chamber on
end with nozzle adapter bracket on top (see Figure 20).
7. Remove ignitor screw with a 1/4" nut dri ver . Carefully remov e
ignitor from nozzle adapter bracket.
CAUTION: Do not bend or strike ignitor element.
Handle with care.
SERVICE PROCEDURES
11
11
8. Carefully remove replacement ignitor from styrofoam 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 1/4" nut driver (see Figure 20).
Torque .90 to 1.69 N-m (8 to 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 (see Figure 19).
12. Replace side cover (see Figures 15 or 16, page 9 or Figure 17,
page 9).
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 13.
14. Replace photocell in photocell bracket. Route wires as shown in
either (see Figures 21 or 22, page 12 or Figure 25, page 13).
15. Replace fan (see page 8).
16. Replace fan guard and upper shell (see page 8).
Nozzle Adapter
Combustion
Chamber
Air Line Hose
Fuel Line Hose
Photocell
Bracket
Photocell
Assembly
Side Cover
Figure 19 - Disconnecting Ignitor Wires from Ignition Control
Assembly (40/55/60/70/110/115/155/165 Models Shown)
Bracket
Ignitor
Ignitor Wire
Ignition
Control
Assembly
Ignitor Screw/
Washer Assembly
Ignitor Element
Photocell
Bracket
Combustion
Chamber
Figure 20 - Ignitor Replacement
Ignitor
Nozzle Adapter
Bracket
Nozzle Adapter
Bracket Opening
111167-01C
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SERVICE PROCEDURES
12
SERVICE PROCEDURES
Continued
NOZZLE ASSEMBLY
(For 40/55/60/70/110/115/155/165 Models Only)
1. Remove upper shell (see Upper Shell Removal, page 8).
2. Remove fan (see Fan, page 8).
3. Remove fuel and air line hoses from nozzle assembly (see Figure 21 or 22).
4. Turn nozzle assembly 1/4 turn to left and pull to ward motor to
remove (see Figure 23).
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 24).
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 4.5 to 5.1 N-m (40 to
45 in-lbs). See Figure 24.
Combustion
Chamber
Nozzle
Adapter
Bracket
Photocell
Bracket
Air Line
Hose
Figure 21 - Removing Air and Fuel Line Hoses
(40/55/60/70 Models Only)
Nozzle/Adapter
Assembly
Fuel Line Hose
10. Attach nozzle assembly to burner strap (see Figure 23).
11. Attach fuel and airline hoses to nozzle assembly . See Fuel and
Airline Replacement and Proper Routing, page 13.
12. Replace fan (see Fan, page 8).
13. Replace fan guard and upper shell (see Upper Shell Removal,
page 8).
Combustion
Chamber
Figure 23 - Removing Nozzle/Adapter Assembly
Nozzle
Face
Nozzle
Nozzle Adapter
Figure 24 - Nozzle and Nozzle Adapter
Nozzle Sleeve
Air Line
Fitting
Nozzle/Adapter
Assembly
Fuel Line
Fitting
Combustion
Chamber
Nozzle Adapter
Bracket
Air Line Hose
Fuel Line
Hose
Photocell Bracket
Figure 22 - Removing Air and Fuel Line Hoses
(110/115/155/165 Models Only)
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Nozzle/
Adapter
Assembly
111167-01C
SERVICE PROCEDURES
Continued
SERVICE PROCEDURES
13
13
(For 200 Model Only)
1. Remove combustion chamber and ignitor by following steps 1
through 7 under Ignitor, page 11.
2. Carefully place the ignitor in a safe location.
3. Remove two nozzle adapter bracket screws (see Figure 25).
4. Place hex-shaped aluminum nozzle adapter into vise (do not
overtighten).
5. Carefully remove nozzle from nozzle adapter using 5/8" socket
wrench (see Figure 26).
6. Blow compressed air through face of nozzle. This will remove any debris in nozzle.
7. Inspect nozzle seal for damage.
8. Replace nozzle into nozzle adapter until nozzle seats. Tighten
80-110 inch-pounds.
9. Attach nozzle adapter bracket to combustion chamber with two
screws removed in step 3.
10. Repeat steps 9 through 16 under Ignitor, page 11.
Combustion
Chamber
Nozzle Adapter
Nozzle
Adapter
Bracket
Bracket
Screw
FUEL AND AIR LINE REPLACEMENT AND
PROPER ROUTING
1. Remove upper shell (see Upper Shell Removal, page 8).
2. Remove side cover screws using 5/16" nut driver (see Figure 15
or 16, page 9 or Figure 17, page 10).
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 21
or 22, page 12, or Figure 25) and from fuel filter (see Fuel Filter ,
pages 9 and 10). If air line hose is damaged, disconnect from
nozzle adapter (see Figure 21 or 22, page 12, or Figure 25) and
from barb fitting on pump end cover (see Figure 27).
5. Install new air and/or fuel line. Attach one end of air line hose to
barb fitting on pump end cover (see Figure 27) and the other
end to nozzle adapter (see Figure 21 or 22, page 12, or Figure
25). Attach one end of fuel line hose to fuel filter (see Fuel Fil-
ter, pages 9 and 10) and the other end to nozzle adapter (see
Figure 21 or 22, page 12, or Figure 25).
Note:
Route hoses as shown in see Figure 21 or 22, page 12,
or Figure 25, according to model. Hoses are not to touch photocell bracket.
6. Replace side cover.
7. Replace upper shell and fan guard (see Upper Shell Removal,
page 8).
Photocell
Bracket
Air Line
Hose
Figure 25 - Removing Air and Fuel Line Hoses (200 Model Only)
Nozzle Face
Nozzle
Nozzle
Adapter
Bracket
Figure 26 - Nozzle and Nozzle Adapter
Nozzle
Sleeve
Air Line
Fitting
Fuel Line Fitting
Nozzle/
Adapter
Assembly
Fuel Line Hose
Nozzle
Adapter
Pump End Cover
Barb
Fitting
Air Hose
40/55/60/70
Models
Figure 27 - Air Hose to Barb Fitting
Barb Fitting
110/115/155/165/200
Models
111167-01C
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14
SERVICE PROCEDURES
SERVICE PROCEDURES
Continued
PUMP ROTOR
(Procedure if Rotor is Binding)
1. Remove upper shell (see Upper Shell Removal, page 8).
2. Remove filter end cover screws using 5/16" nut driver (see Figure 28 or 29).
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 28 or 29).
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 .076/.101 mm (.003"/.004") if
needed (see Figure 30).
Note:
Rotate rotor one full turn to ensure the gap is .076/.101 mm
(.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 (see Upper Shell Removal,
page 8).
12. Adjust pump pressure (see Pump Pressure Adjustment, page 9).
Note:
If rotor is still binding, proceed as follows.
13. Perform steps 1 through 6.
14. Place fine grade sandpaper (600 grit) on flat surface. Sand rotor lightly in “figure 8” motion four times (see Figure 31).
15. Reinstall insert and rotor.
16. Perform steps 10 through 12.
Blade
Pump Plate
Air Intake Filter
Filter End
Cover
Blade
Pump Plate
Air Intake
Filter
Rotor
Insert
Air Output
Filter
Figure 29 - Rotor Location, 110/115/155/165/200 Models
Gap Adjusting Screw
.003"/.004"
(.076-.101 mm)
Gap Measured
Blade
Gap Adjusting Screw
Figure 30 - Gap Adjusting Screw Locations
Sandpaper
With Feeler
Gauge
Rotor
Filter End
Cover
Insert
Figure 28 - Rotor Location, 40/55/60/70 Models
Rotor
Air Output
Filter
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Figure 31 - Sanding Rotor
111167-01C
SERVICE PROCEDURES
TECHNICAL SERVICE
REPLACEMENT PARTS
15
15
SERVICE PROCEDURES
Continued
IGNITION CONTROL ASSEMBLY
WARNING: High voltage!
1. Unplug heater.
2. Remove side cover screws (4) using 5/16" nut-driver to expose ignition control assembly.
3. Remove fuse cover (see Figure 32).
4. Remove fuse from fuse clips (see Figure 32).
5. Replace fuse with fuse of the same type and rating (GMA-10).
Do not substitute a fuse with a higher current rating.
6. Replace fuse cover (see Figure 32).
7. Replace side cover (see Figures 15 or 16, page 9 or Figure 17,
page 10).
Fuse Clips
Fuse
Cover
Fuse
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
original replacement part(s), call DESA Heating Products’ Technical 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.
Figure 32 - Replacing Fuse
PARTS NOT UNDER WARRANTY
Contact authorized dealers of this product. If they can’t supply original
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
111167-01C
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For more information, visit www.desatech.com
16
SPECIFICATIONS
WIRING DIAGRAMS
SPECIFICATIONS
Model Size 40 55/60 70 110/115 155 165 200
Output Rating (Btu/Hr) 40,000 55,000 70,000 110,000 155,000 165,000 200,000
and 60,000 and 115,000
Fuel Use only kerosene, #1/#2 diesel/fuel oil, JET A or JP-8 fuels*
Fuel Tank Capacity
(U.S. Gal./Liters) 3/11.3 5/18.9 5/18.9 9/34 13.5/51 13.5/51 13.5/51
Fuel Consumption
(Gal. Per Hr/Liters Per Hr) .3/1.14 .44/1.67 .52/1.97 .85/3.00 1.14/4.31 1.2/4.54 1.4/5.3
Pump Pressure (psi) 3.0 3.4 4.7 5.1 5.2 5.6 6.2
Electric Requirements 120 V/60 HZ (Same All Models)
Amperage (Normal Run) 2.0 2.0 2.8 3.6 3.6 3.6 3.6
Motor RPM 1725 1725 3440 3400 3400 3400 3400
Hot Air Output (CFM) 170 180 360 490 550 575 600
Motor HP 1/15 1/15 1/8 1/5 1/5 1/5 1/4
Shipping Weight 32/14.5 33/15 35/15.9 54/24.5 63/28.6 65/29.5 77/35
(Approximate Pounds/Kilograms)
Heater Weight without Fuel 28/12.7 29/13.1 31/14 46/21 54/24.5 55/25 66/30
(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.
WIRING DIAGRAMS
Photocell
Photocell
Ignitor
Ignition Control Assembly
Figure 34 - Wiring Diagram without Thermostat (40/55/60/70/110/115/155/165 Models)
Motor Return
AC Neutral (L2)
120V (L1)
Motor
Ignitor
Blue
Blue
Red
Black
White
Green
Yellow
Photocell
White
Motor
Green
Power Plug
120V/60Hz
Yellow
Ignitor
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111167-01C
WIRING DIAGRAMS
Continued
White
Black
Thermostat
Red
Blue
Blue
White
Green
Photocell
120V/60Hz
Black
White
White
Power Plug
Green
Solenoid
Red
Valve
Motor
Yellow
Yellow
Red
Ignitor
Photocell
Photocell
Ignitor
Motor Return
AC Neutral (L2)
AC Hot (L1)
Ignition Control Assembly
Motor
Ignitor
(Heater with Fuel Valve Assembly) (Heater without Fuel Valve Assembly)
Figure 35 - Wiring Diagram with Thermostat for 200 Model
WIRING DIAGRAMS
Photocell
Photocell
Ignitor
Motor Return
AC Neutral (L2)
120V (L1)
Ignition Control Assembly
Motor
Ignitor
Blue
Blue
White
Green
Red
Black
Y ellow
Photocell
White
Green
Motor
Yellow
Thermostat
Ignitor
17
17
lug
er P
ow
P
120V
Black
/60H
z
Photocell
Photocell
Blue
Blue
Photocell
White
Ignitor
Ignitor
Green
Yellow
Thermostat
Power Plug
120V/60Hz
Black
Motor Return
AC Neutral (L2)
White
Green
Motor
120V (L1)
Ignition Control Assembly
Motor
Red
Black
Ignitor
Y ellow
Figure 36 - Wiring Diagram with Thermostat (40/55/60/70/110/115/155/165 Models)
Blue
Blue
White
White
Black
Red
Green
Photocell
White
Power Plug
120V/60Hz
Green
Solenoid
Valve
White
Motor
Red
Black
Red
Black
Ignitor
Photocell
Photocell
Motor Return
AC Neutral (L2)
120V (L1)
Ignition Control Assembly
Ignition Control Assembly
AC Neutral (L2)
Photocell
Photocell
Ignitor
Motor Return
AC Hot (L1)
Motor
Ignitor
(Heater with Fuel Valve Assembly) (Heater without Fuel Valve Assembly)
Ignitor
Motor
Ignitor
Blue
Blue
Red
Black
White
Green
Yellow
Photocell
White
Motor
Ignitor
Green
Yellow
ow
P
120V
er P
/60H
lug
z
Figure 37 - Wiring Diagram without Thermostat for 200 Model
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For more information, visit www.desatech.com
111167-01C
18
ILLUSTRATED PARTS BREAKDOWN
40/55/60/70 Models
ILLUSTRATED PARTS
BREAKDOWN
40/55/60/70 MODELS
Standard Thermostat
Models Models
R40 R40T
REM40 REM40T
R55B R55BT
R60 R60T
B55B B55BT
REM60 REM60T
R70D R70DT
B70D B70DT
RM60 RM60T
22
4
5
35
3
9
7
8
6
21
10
20
23
18
1
2
9-1
9-2
9-5
11
9-4
9-3
12
13
16
24
12-18
12-17
12-1
12-16
12-2
12-5
12-3
12-4
12-15
12-14
17
12-6
19
34
12-7
31
12-8
12-9
28
30
29
32
12-13
12-10
36
25
27
39
26
37
38
33
15
14
Motor and Pump Assembly
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12-12
12-19
12-11
111167-01C
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