Desa NTH100-2, NTH50-2, NTH70-2, NTH150-2, NTH35-2 User Manual

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PORTABLE
AIR HEATERS
OWNER’S MANUAL
Heater Sizes: 35,000 50,000 70,000
100,000 150,000 Btu/Hr
Models: NTH35-2, NTH50-2, NTH70-2, NTH100-2,
and NTH150-2
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 30 kw (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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105787
OWNER’S MANUAL
PRODUCT IDENTIFICATION
Hot Air Outlet
Upper Shell
Lower Shell
Fuel Tank
Side Cover
ON/OFF Switch with Light
Power Cord
Figure 1 - 35/50/70,000 Btu/Hr Models
Hot Air Outlet
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 re or explosion. Never use gasoline, naphtha, paint thinners, alcohol or other highly ammable 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:
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.
Use a KEROSENE ONLY
Lower Shell
Fuel Cap
Side Cover
Figure 2 - 100/150,000 Btu/Hr Models
Upper Shell
Fan Guard
Fuel Tank
Power Cord
ON/OFF Switch with Light
105787
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 30kw (100,000 Btu/Hr) rating. Provide extra fresh air if more heaters are being used.
Example:
requires one of the following:
• a two-car garage door [4.9 meter (16 feet) opening] raised 9 cm (3.5 inches)
• a single-car garage door [2.75 meter (9 feet) opening] raised 15.25 cm (6 inches)
• two, 76 cm (30 inch) windows raised 28 cm (11 inches)
A 44kw (150,000 Btu/Hr) heater
Screw
Hot Air Outlet
Fuel Tank Flange
Wheel Support Frame
Wheel
Cap Nut
Figure 3 - Wheel and Handle Assembly
Nut
Axle
Rear Handle
Air Inlet
Extended Hub
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105787
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 sys-
tem causes the heater to shut down if the flame goes out.
Combustion Chamber
Ignitor
OPERATION
WARNING: Review and un-
derstand the warnings in the
Safety Information
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 240 volt/50 hertz, grounded (earthed) outlet. Use an extension cord if needed. Use only a three-prong, grounded (earthed) extension cord.
Motor
Fan
section, page
Air Pump
Air Intake Filter
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 mm
2
(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
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.
|
ON/OFF Switch
O
with Light
Clean Heated Air Out
Fuel Tank
Figure 4 - Cross Section Operational View
Nozzle
Air For Fuel System
Fuel Filter
Air Line To Burner
Air For Combustion And Heating
Cool Air In
Air Output Filter
Ignition Control Assembly
Fuel
Figure 5 - ON/OFF Switch, 35/50/70,000 Btu/Hr Models
|
ON/OFF Switch
O
with Light
Figure 6 - ON/OFF Switch, 100/150,000 Btu/Hr Models
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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
PREVENTATIVE MAINTENANCE SCHEDULE
Item
Fuel tank
Air output and lint filters
Air intake filter
Fuel filter
Ignitor 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
No maintenance required Clean every season or as
needed Not required/permanently lu-
bricated
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 Ship- ping
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 Fan, page 13
TROUBLESHOOTING
FAULT CONDITION
Motor does not start five seconds after heater is plugged in (ON/OFF switch light remains on)
WARNING: Never service heater while it is plugged in, operating, or
hot. Severe burns and electrical shock can occur.
ATTENTION:
the light in the ON/OFF switch to troubleshoot the fault condition.
POSSIBLE CAUSE
1. Bad electrical connection between motor and ignition control assembly or ignition control assembly and power cord
2. Binding pump rotor
3. Defective ignition control assembly
4. Defective motor
The ignition control has built-in protection against current overloads. Use
REMEDY
1. Check all electrical connections. See Wiring Diagram, page 25
WARNING: High voltage!
2. If fan does not turn freely, see Pump Rotor, page 12
3. Replace ignition control assembly
4. Replace motor
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105787
TROUBLESHOOTING
Continued
OWNER’S MANUAL
FAULT CONDITION
Motor starts and runs but heater does not ignite (ON/OFF switch light remains on)
Heater ignites but ignition control assembly shuts heater off after a short period of time (ON/OFF switch light remains on)
POSSIBLE CAUSE
1. No fuel in tank
2. Pump pressure incorrect
3. Dirty fuel filter
4. Obstruction in nozzle assembly
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
1. Pump pressure incorrect
2. Dirty air intake, air output, and/or lint filter
3. Dirty fuel filter
4. Obstruction in nozzle assembly
5. Photocell assembly not properly installed (not seeing the flame)
WARNING: High voltage!
REMEDY
1. Fill tank with kerosene
2. See Pump Pr essure Adjustment, page 10
3. See Fuel Filter, page 8
4. See Nozzle Assembly, page 11
5. Drain and flush fuel tank with clean kerosene. See Storing, Transporting, or Shipping, page 6
6. Check electrical connections. See Wiring Diagram, page 25
7. Replace ignitor, see page 9
8. Replace ignition control assembly
1. See Pump Pr essure Adjustment, page 10
2. See Air Output, Air Intake, and Lint Filters, page 10
3. See Fuel Filter, page 8
4. See Nozzle Assembly, page 11
5. Make sure photocell boot is properly seated in bracket
ON/OFF switch light does not come on when switch is turned to the ON (|) position and heater does not start
ON/OFF switch light comes on when switch is turned to the ON (|) position but turns off after five seconds
6. Dirty photocell lens
7. Bad electrical connection between photocell and ignition control assembly
8. Defective photocell
9. Defective ignition control assembly
1. No power to heater
WARNING: High voltage!
2. Bad electrical connections
3. Electrical short in ignitor
1. Electrical short in motor
WARNING: High voltage!
6. Clean photocell lens
7. Check electrical connections. See Wiring Diagram, page 25
8. Replace photocell
9. Replace ignition control assembly
1. Verify that power cord is plugged into an electrical outlet and that the circuit breaker in the electral panel is reset
2. Check electrical wiring and connections. See W iring Diagram, page 25
3. Check ignitor wiring. If no problems are found, replace ignitor (see page 9)
1. Check motor wiring. If no problems are found, replace motor
105787
7
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
8
105787
OWNER’S MANUAL
SERVICE PROCEDURES
Continued
IGNITOR
1. Remove upper shell and fan guard (see page 8).
2. Remove fan (see page 13).
3. Remove 4 side cover screws with a 5/16" nut driver. Remove side cover (see Figure 9 or 10, page 8).
4. Disconnect ignitor wires (black) 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).
Combustion Chamber
Nozzle Adapter Bracket
Ignitor
6. Remove combustion chamber. Stand combustion chamber on end with nozzle adapter bracket on top (see Fig­ure 12).
7. Remove ignitor screw with a 1/4" nut driver. Carefully remove ignitor from nozzle adapter bracket.
CAUTION: Do not bend or strike
ignitor element. Handle with care.
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 12). T orque .90 to 1.69 N-m (8 to 15 in-lbs). Do not over torque.
Ignitor Screw/Washer Assembly
10. Replace combustion chamber.
11. Route the ignitor wires back down through the hole in the lower shell. Connect wires to the ignition control assembly.
12. Replace side cover (see Figure 9 or 10, page 8).
13. Connect and route fuel line hose and air line hose to burner head. See Fuel
and Air Line Replacement and Proper Routing, page 11.
14. Replace photocell in photocell bracket. Route wires as shown in either Figure 17, 18, or 19, page 11.
15. Replace fan (see page 13).
16. Replace fan guard and upper shell (see page 8).
Air Line Hose
Fuel Line Hose
Photocell Bracket
Photocell Assembly
Side Cover
Figure 11 - Disconnecting Ignitor Wires from Ignition Control Assembly
Ignitor Wires
Ignition Control Assembly
Ignitor Element
Photocell Bracket
Combustion Chamber
Figure 12 - Ignitor Replacement
Nozzle Adapter Bracket Opening
Nozzle Adapter Bracket
Ignitor
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Continued
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