Desa NTH50, NTH35, NTH70, NTH150, NTH100 User Manual

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PORTABLE
FORCED
OWNER’S MANUAL
Heater Sizes: 35,000 50,000 70,000
100,000 150,000 Btu/Hr
Models: NTH35, NTH50, NTH70, NTH100, and NTH150
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.
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 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 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
Flame-Out Control Reset Button
Figure 1 - 35/50/70,000 Btu/Hr Models
Power Cord
Handle
Fan Guard
Air Filter End Cover
Fuel Cap
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
• carbon build up on spark plug
• use of non-toxic anti-icer in fuel during very cold weather
Hot Air Outlet
Lower Shell
Fuel Cap
Side Cover
Figure 2 - 100/150,000 Btu/Hr Models
Upper Shell
ON/OFF Switch
Fan Guard
Fuel Tank
Flame-Out Control Reset Button
Power Cord
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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3
PORTABLE FORCED AIR HEATERS
ASSEMBLY
(FOR 100,000 AND 150,000 BTU/HR MODELS ONLY)
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:
point extended hub of wheels toward wheel support frame (see Figure 3).
When installing wheels,
2. Place cap nuts on axle ends. Gently tap with hammer to secure.
3. Place heater on wheel support frame. 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. Place front handle and rear handle on top of fuel tank flange. Insert screws through handles, 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
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.
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:
one of the following:
• a two-car garage door (16 feet wide open-
• a single-car garage door (9 feet wide
• two, 76 cm (30 inch) windows raised 31
A 150,000 Btu/Hr heater requires
ing) raised 9 cm (3 1/2 inches)
opening) raised 15.25 cm (6 inches)
cm (12 inches)
Screw
Hot Air Outlet
Fuel Tank Flange
Wheel Support Frame
Wheel
Cap Nut
Figure 3 - Wheel and Handle Assembly, 100/150,000 Btu/Hr Models Only
Nut
Axle
Extended Hub
Rear Handle
Air Inlet
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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 electronic ignitor sends voltage to the spark plug. The spark plug ignites the fuel and air mixture.
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. 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 and heater
should start. If heater does not start, press flame-out control reset button (see Figures 5 and 6).
TO STOP HEATER
1. Push ON/OFF switch to OFF.
TO RESTART HEATER
1. Wait 2 minutes after stopping heater.
2. Repeat steps under To Start Heater.
Flame-Out Control Reset Button
ON/OFF Switch
Combustion Chamber
Clean Heated Air Out
Fuel Tank
Figure 4 - Cross Section Operational View
Nozzle
Air For Fuel System
Spark Plug
Fuel Filter
Burner Head
Air Line To Burner
Air For Combustion And Heating
Motor
Fan
Air Pump
Intake Air Filter
Electronic Ignitor
Fuel
Cool Air In
Output Air Filter
Figure 5 - Flame-Out Control Reset Button, 35/50/70,000 Btu/Hr
Flame-Out Control Reset Button
ON/OFF Switch
Figure 6 - Flame-Out Control Reset Button, 100/150,000 Btu/Hr
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5
PORTABLE FORCED AIR HEATERS
STORING, TRANSPORTING, OR SHIPPING
Note:
If shipping, transport companies re-
quire 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:
summer months for use during next heating season. Using old fuel could damage heater.
Do not store kerosene over
PREVENT A TIVE MAINTENANCE SCHEDULE
Item
Fuel tank
Air output and lint filters
Air intake filter
Fuel filter
Spark plug
Fan blades
Motor
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.
Clean and regap every 600 hours operation or replace as needed.
Clean every season or as needed.
Not required/permanently lu­bricated
WARNING: Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur.
How To
See Storing, Transporting, or Ship­ping.
See Air Output, Air Intake, and Lint Filters, page 10.
See Air Output, Air Intake, and Lint Filters, page 10.
See Fuel Filter, page 8.
See Spark Plug, page 9.
See Fan, page 13.
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OWNER’S MANUAL
TROUBLESHOOTING
OBSERVED FAULT
Heater ignites, but flame-out control shuts off heater after a short period of time.
Heater will not ignite, but motor runs for a short period of time.
WARNING: Never service heater while it is plugged in, operating, or
hot. Severe burns and electrical shock can occur.
POSSIBLE CAUSE
1. Wrong pump pressure
2. Dirty air output, air intake, and lint filters
3. Dirty fuel filter
4. Dirt in nozzle
5. Dirty photocell lens
6. Bad flame-out control
1. Wrong pump pressure
2. Carbon deposits on spark plug and/or improper gap
3. Dirty fuel filter
4. Dirt in nozzle
5. Water in fuel tank
WARNING: High voltage!
REMEDY
1. See Pump Pressur e Adjustment, page 10.
2. See Air Output, Air Intake and Lint Filters, page 10.
3. See Fuel Filter, page 8.
4. See Nozzle, page 11.
5. Clean photocell lens.
6. Replace flame-out control.
1. See Pump Pressur e Adjustment, page 10.
2. See Spark Plug, page 9.
3. See Fuel Filter, page 8.
4. See Nozzle, page 11.
5. Drain and flush fuel tank with clean kerosene. See Storing, Transporting, or Shipping, page 6.
Motor does not start when heater is plugged in, fan rotates slowly or does not turn.
6. Electronic ignitor not grounded (earthed)
7. Bad electronic ignitor
1. Flame-out control not reset
2. Binding pump rotor
6. Make sure electronic ignitor mounting is tight.
7. Replace electronic ignitor.
1. Reset flame-out control button, see Figures 5 and 6, page 5.
2. If fan is hard to turn, see Pump Rotor, page 12.
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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
(35/50/70,000 Btu/Hr Models)
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. W ash fuel filter with clean fuel and re­place in tank.
6. Attach rubber fuel line to fuel filter neck.
7. Replace side cover.
Fuel Filter
(100/150,000 Btu/Hr 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. W ash fuel filter with clean fuel and re­place in tank.
6. Attach upper fuel line to fuel filter neck.
7. Replace side cover.
Upper Shell
Fan Guard
Figure 7 - Upper Shell Removal, 35/50/ 70,000 Btu/Hr Models
Fuel Filter
Side Cover
Figure 9 - Fuel Filter Removal, 35/50/70,000 Btu/Hr Models
Fuel Filter, Bushing, and Lower Fuel Line
Upper Shell
Figure 8 - Upper Shell Removal, 100/ 150,000 Btu/Hr Models
Fuel Line
Fan Guard
Upper Fuel Line
Side Cover
Figure 10 - Fuel Filter Removal, 100/150,000 Btu/Hr Models
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