PORTABLE
FORCED
AIR HEATERS
OWNER’S MANUAL
Models: D20N, D30N, and D44N
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.
D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS
SAFETY
INFORMATION
WARNINGS
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 or No. 1 fuel oil 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 thoroughly 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 extinguished and the heater allowed to cool, prior to fueling.
d)During fueling, all fuel lines and fuelline 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 having jurisdiction.
•Never use heater where gasoline, paint thinner, or other 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 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.
•Use only in well-vented areas. Before using heater, provide at least a 2800 square cm (three-square-foot) opening of fresh, outside air for each 100,000 Btu/Hr of rating.
•Use only in places free of flammable vapors or high dust content.
•Use only the electrical voltage and frequency specified on model plate.
•Use only a three-prong, grounded extension cord.
•Minimum heater clearances from combustibles:
Outlet: 250 cm (8 Ft.)
Sides, Top, and Rear: 125 cm (4 Ft.)
•Locate heater on a stable and level surface 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.
•When used with thermostat, 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.
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OWNER’S MANUAL
PRODUCT IDENTIFICATION
Hot Air Outlet
Upper Shell 
Lower Shell
Fuel Tank
Side Cover
ON/OFF Switch with Light
Figure 1 - D20N Model
Hot Air Outlet
Lower
Shell
Fuel Cap
Fan Guard
Air Filter
End Cover
Fuel Cap
Power
Cord
Upper Shell
Fan Guard
Fuel Tank
Side Cover
Power Cord
ON/OFF Switch with Light
Figure 2 - D30N and D44N 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.
FUELS
WARNING: Use only kerosene or No. 1 fuel oil to avoid risk of fire or explosion. Never use gasoline, naphtha, paint thinners, alcohol or other highly flammable fuels.
Do not use heavy fuels such as No. 2 fuel oil or No. 2 Diesel. Using heavy fuels will result in:
•clogged fuel filter and nozzle
•use of non-toxic anti-icer in fuel during very cold weather
IMPORTANT: Use a KEROSENE ONLY container. Be sure storage container is clean. Foreign matter such as rust, dirt, or water will cause the flame-out control to shut down heater. Foreign matter may also require you to clean fuel system often.
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D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS
ASSEMBLY
These models are furnished with wheels and handles. Wheels, handles, 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: When installing wheels, point extended hub of wheels toward wheel support frame (see Figure 3).
2.Place cap nuts on axle ends. Gently tap with hammer to secure.
3.Place heater on wheel support frame. For D20N model, make sure outlet end (front) of heater is over wheels. For D30N and D44N models, make sure air inlet end (rear) of heater is over wheels. Line up holes on fuel tank flange with holes on wheel support frame.
4.For D20N model, place rear handle on top of fuel tank flange. For D30N and D44N models, place front handle and rear handle 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.
VENTILATION
WARNING: Follow the minimum fresh, outside air ventilation requirements. If proper fresh, outside air ventilation is not provided, carbon monoxide poisoning can occur. Provide proper fresh, outside air ventilation before running heater.
D20N Model |
Sleeve Cap |
Screw |
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Hot Air |
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Outlet |
Handle |
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Fuel |
Air |
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Tank |
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Inlet |
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Flange |
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Axle
Cap Nut
Nut |
Extended |
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Hub |
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Wheel
Front
Handle Wheel Support
Frame
Screw
Hot Air |
Rear |
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Outlet |
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Handle |
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Fuel |
Air |
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Inlet |
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Tank |
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Flange |
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D30N and D44N Models
Wheel
Support
Frame
Wheel Nut
Extended
Axle Hub
Cap Nut
Figure 3 - Wheel and Handle Assembly
Provide a fresh air opening of at least 2800 square cm (three square feet) for each 100,000 Btu/Hr rating. Provide extra fresh air if more heaters are being used.
Example: A 150,000 Btu/Hr heater requires one of the following:
•a two-car garage door [4.9 m (16 ft.) opening] raised 9 cm (3.5 inches)
•a single-car garage door [2.75 m (9 ft.) opening] raised 15.25 cm (6 inches)
•two, 76 cm (30 inch) windows raised 28 cm (11 inches)
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OWNER’S MANUAL
THEORY OF
OPERATION
The Fuel System: The air pump forces air through the air line. The air is then pushed through the burner head 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.
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.
OPERATION
WARNING: Review and understand the warnings in the
Safety Information section, page 2. They are needed to safely operate this heater. Follow all local codes when using this heater.
TO START HEATER
1.Follow all ventilation and safety information.
2.Fill fuel tank with kerosene or No. 1 fuel oil.
3.Attach fuel cap.
4.Plug power cord of heater into standard 230 volt/50 hertz, grounded (earthed) outlet. Use an extension cord if needed. Use only a three-prong, grounded (earthed) extension cord.
Extension Cord Wire Size
Requirements
Up to 30.5 meters (100 feet) long, use 1.0 mm2 (16 AWG) conductor
30.6 to 61 meters (101 to 200 feet) long, use 1.5 mm2 (14 AWG) conductor
Push ON/OFF switch to ON (|) position and heater should start in 5 seconds. If ON/OFF switch light does not come on or heater does not start, see Troubleshooting (pages 6 and 7).
TO STOP HEATER
1.Push ON/OFF switch to OFF (O) position.
TO RESET HEATER
1.Push ON/OFF switch to OFF (O) position and wait 10 seconds (2 minutes if heater has been running).
2.Repeat steps under To Start Heater.
Combustion Chamber |
Motor |
Air Pump |
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ON/OFF Switch with Light |
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Ignitor |
Air Intake |
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Fan |
Filter |
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Clean |
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Cool |
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Heated |
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Air |
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Air Out |
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In |
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Air |
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Output |
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Filter |
Figure 5 - ON/OFF Switch, D20N Model |
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Fuel |
Nozzle |
Fuel |
Air Line |
Ignition Control |
Tank |
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Filter |
To Burner |
Assembly |
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Air For Fuel System |
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Air For Combustion |
Fuel |
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And Heating |
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Figure 4 - Cross Section Operational View
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O
ON/OFF Switch with Light
Figure 6 - ON/OFF Switch, D30N and
D44N Models
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D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS
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: Do not store kerosene over summer months for use during next heating season. Using old fuel could damage heater.
PREVENTATIVE |
WARNING: Never service heater |
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MAINTENANCE |
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while it is plugged in, operating, or hot. |
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SCHEDULE |
Severe burns and electrical shock can |
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occur. |
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Item |
How Often |
How To |
Fuel tank |
Flush every 150-200 hours of |
See Storing, Transporting, or Ship- |
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operation or as needed |
ping |
Air output and |
Replace every 500 hours of |
See Air Output, Air Intake, and Lint |
lint filters |
operation or once a year |
Filters, page 10 |
Air intake filter |
Wash and dry with soap and |
See Air Output, Air Intake, and Lint |
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water every 500 hours of op- |
Filters, page 10 |
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eration or as needed |
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Fuel filter |
Clean twice a heating season |
See Fuel Filter, page 8 |
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or as needed |
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Ignitor |
No maintenance required |
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Fan blades |
Clean every season or as |
See Fan, page 13 |
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needed |
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Motor |
Not required/permanently lu- |
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bricated |
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TROUBLESHOOTING |
WARNING: Never service heater while it is plugged in, operating, or |
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hot. Severe burns and electrical shock can occur. |
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ATTENTION: The ignition control has built-in protection against current overloads. Use |
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the light in the ON/OFF switch to troubleshoot the fault condition. |
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FAULT CONDITION |
POSSIBLE CAUSE |
REMEDY |
Motor does not start five seconds after heater is plugged in (ON/OFF switch light remains on)
1. Bad electrical connection between motor |
1. Check all electrical connections. See |
and ignition control assembly or ignition |
Wiring Diagram, page 21 |
control assembly and power cord |
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WARNING: High voltage! |
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2. |
Blown fuse on ignition control assembly |
2. |
See Ignition Control Assembly, page 13 |
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3. |
Binding pump rotor |
3. |
If fan does not turn freely, see Pump |
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Rotor, page 12 |
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4. |
Defective ignition control assembly |
4. |
Replace ignition control assembly |
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5. |
Defective motor |
5. |
Replace motor |
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OWNER’S MANUAL
TROUBLESHOOTING
Continued
FAULT CONDITION |
POSSIBLE CAUSE |
REMEDY |
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Motor starts and runs but heater does not |
1. |
No fuel in tank |
1. |
Fill tank with kerosene |
ignite (ON/OFF switch light remains on) |
2. |
Pump pressure incorrect |
2. |
See Pump Pressure Adjustment, page 10 |
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3. |
Dirty fuel filter |
3. |
See Fuel Filter, page 8 |
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4. |
Obstruction in nozzle assembly |
4. |
See Nozzle Assembly, page 11 |
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5. |
Water in fuel tank |
5. |
Drain and flush fuel tank with clean |
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kerosene. See Storing, Transporting, or |
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Shipping, page 6 |
WARNING: High voltage!
6.Bad electrical connection between ignitor and ignition control assembly
7.Defective ignitor
8.Defective ignition control assembly
6.Check electrical connections. See Wiring Diagram, page 21
7.Replace ignitor, see page 9
8.Replace ignition control assembly
Heater ignites but ignition control assembly |
1. |
Pump pressure incorrect |
1. |
See Pump Pressure Adjustment, page 10 |
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shuts heater off after a short period of time |
2. |
Dirty air intake, air output, and/or lint |
2. |
See Air Output, Air Intake, and Lint |
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(ON/OFF switch light remains on) |
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filter |
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Filters, page 10 |
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3. |
Dirty fuel filter |
3. |
See Fuel Filter, page 8 |
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4. |
Obstruction in nozzle assembly |
4. |
See Nozzle Assembly, page 11 |
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5. |
Photocell assembly not properly |
5. |
Make sure photocell boot is properly |
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installed (not seeing the flame) |
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seated in bracket |
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WARNING: High voltage! |
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6. |
Dirty photocell lens |
6. |
Clean photocell lens |
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7. |
Bad electrical connection between |
7. |
Check electrical connections. See Wiring |
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photocell and ignition control assembly |
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Diagram, page 21 |
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8. |
Defective photocell |
8. |
Replace photocell |
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9. |
Defective ignition control assembly |
9. |
Replace ignition control assembly |
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ON/OFF switch light does not come on |
1. |
No power to heater |
1. |
Verify that power cord is plugged into |
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when switch is turned to the ON(I) position |
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an electrical outlet and that the circuit |
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and heater does not start |
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breaker in the electral panel is reset |
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WARNING: High voltage! |
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2. |
Bad electrical connections |
2. |
Check electrical wiring and connections. |
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See Wiring Diagram, page 21 |
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3. |
Electrical short in ignitor |
3. |
Check ignitor wiring. If no problems are |
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found, replace ignitor (see page 9) |
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ON/OFF switch light comes on when switch 1. Electrical short in motor is turned to the ON(I) Position but turns off
after five seconds
1.Check motor wiring. If no problems are found, replace motor
WARNING: High voltage!
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7 |
D20N, D30N AND D44N MODELS PORTABLE FORCED AIR HEATERS
SERVICE
PROCEDURES
WARNING: Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur.
UPPER SHELL REMOVAL
1.Remove screws and lock washers along each side of heater using 5/16" nutdriver. These screws attach upper and lower shells together.
2.Lift upper shell off.
3.Remove fan guard.
FUEL FILTER
(D20N Model)
1.Remove side cover screws using 5/16" nut-driver.
2.Remove side cover.
3.Pull rubber fuel line off fuel filter neck.
4.Carefully pry bushing and fuel filter out of fuel tank.
5.Wash fuel filter with clean fuel and replace in tank.
6.Attach rubber fuel line to fuel filter neck.
7.Replace side cover.
Upper Shell |
Upper |
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Shell |
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Fan |
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Guard |
Fan
Guard
Figure 7 - Upper Shell Removal, D20N |
Figure 8 - Upper Shell Removal, D30N |
Model |
and D44N Models |
Fuel Filter |
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Side Cover
Fuel Line
Figure 9 - Fuel Filter Removal, D20N Model
FUEL FILTER
(D30N and D44N Models)
1.Remove 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, lower fuel line, and fuel filter out of fuel tank.
5.Wash fuel filter with clean fuel and replace in tank.
6.Attach upper fuel line to fuel filter neck.
7.Replace side cover.
Fuel Filter, Bushing,
and Lower Fuel Line
Upper Fuel
Line
Side Cover
Figure 10 - Fuel Filter Removal, D30N and D44N Models
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