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

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PORTABLE

FORCED

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 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 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

Handle

Upper Shell

 

Fan Guard

Lower Shell

Air Filter

End Cover

Fuel Tank

Fuel Cap

Side Cover

ON/OFF Switch with Light

Power

Cord

Figure 1 - 35/50/70,000 Btu/Hr Models

Hot Air Outlet

Upper Shell

Lower

Shell

Fuel Cap

Fan Guard

Fuel Tank

Side Cover

Power Cord

ON/OFF Switch with Light

Figure 2 - 100/150,000 Btu/Hr 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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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: 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. 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

 

Screw

Hot Air

Rear

Outlet

Handle

 

Fuel Tank

Air

Inlet

Flange

 

Wheel

Support

Frame

Wheel

Nut

 

Cap Nut

 

Extended

 

Axle

Hub

Figure 3 - Wheel and Handle Assembly

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: A 44kw (150,000 Btu/Hr) heater 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)

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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 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 240 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

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

 

Ignitor

Air Intake

 

Fan

Filter

Clean

 

Cool

Heated

 

 

Air

Air Out

 

 

In

 

 

|

O

ON/OFF Switch with Light

Air

Output

Filter Figure 5 - ON/OFF Switch, 35/50/70,000

Btu/Hr Models

Fuel

Nozzle

Fuel

Air Line

Ignition Control

Tank

 

Filter

To Burner

Assembly

 

Air For Fuel System

 

Air For Combustion

Fuel

 

 

And Heating

 

 

 

 

Figure 4 - Cross Section Operational View

|

O

ON/OFF Switch 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 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

MAINTENANCE

while it is plugged in, operating, or hot.

SCHEDULE

Severe burns and electrical shock can

occur.

 

 

Item

How Often

How To

Fuel tank

Flush every 150-200 hours of

See Storing, Transporting, or Ship-

 

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

 

water every 500 hours of op-

Filters, page 10

 

eration or as needed

 

Fuel filter

Clean twice a heating season

See Fuel Filter, page 8

 

or as needed

 

Ignitor

No maintenance required

 

Fan blades

Clean every season or as

See Fan, page 13

 

needed

 

Motor

Not required/permanently lu-

 

 

bricated

 

TROUBLESHOOTING

WARNING: Never service heater while it is plugged in, operating, or

 

 

hot. Severe burns and electrical shock can occur.

 

 

 

ATTENTION: The ignition control has built-in protection against current overloads. Use

 

the light in the ON/OFF switch to troubleshoot the fault condition.

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 25

control assembly and power cord

 

WARNING: High voltage!

2.

Binding pump rotor

2.

If fan does not turn freely, see Pump

 

 

 

Rotor, page 12

3.

Defective ignition control assembly

3.

Replace ignition control assembly

4.

Defective motor

4.

Replace motor

6

105787

OWNER’S MANUAL

TROUBLESHOOTING

Continued

FAULT CONDITION

POSSIBLE CAUSE

REMEDY

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

 

3.

Dirty fuel filter

3.

See Fuel Filter, page 8

 

4.

Obstruction in nozzle assembly

4.

See Nozzle Assembly, page 11

 

5.

Water in fuel tank

5.

Drain and flush fuel tank with clean

 

 

 

 

 

kerosene. See Storing, Transporting, or

 

 

 

 

 

Shipping, page 6

 

 

 

 

 

 

 

 

WARNING: High voltage!

 

 

 

 

 

 

 

 

 

6.

Bad electrical connection between

6.

Check electrical connections. See Wiring

 

 

ignitor and ignition control assembly

 

Diagram, page 25

 

7.

Defective ignitor

7.

Replace ignitor, see page 9

 

8.

Defective ignition control assembly

8.

Replace ignition control assembly

 

 

 

 

 

 

 

Heater ignites but ignition control assembly

1.

Pump pressure incorrect

1.

See Pump Pressure Adjustment, page 10

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

(ON/OFF switch light remains on)

 

filter

 

Filters, page 10

 

3.

Dirty fuel filter

3.

See Fuel Filter, page 8

 

4.

Obstruction in nozzle assembly

4.

See Nozzle Assembly, page 11

 

5.

Photocell assembly not properly

5.

Make sure photocell boot is properly

 

 

installed (not seeing the flame)

 

seated in bracket

 

 

 

 

 

 

 

WARNING: High voltage!

 

 

 

 

 

 

 

 

 

6.

Dirty photocell lens

6.

Clean photocell lens

 

7.

Bad electrical connection between

7.

Check electrical connections. See Wiring

 

 

photocell and ignition control assembly

 

Diagram, page 25

 

8.

Defective photocell

8.

Replace photocell

 

9.

Defective ignition control assembly

9.

Replace ignition control assembly

 

 

 

 

 

 

 

ON/OFF switch light does not come on 1. No power to heater when switch is turned to the ON (|) position

and heater does not start

1.Verify that power cord is plugged into an electrical outlet and that the circuit breaker in the electral panel is reset

 

 

 

WARNING: High voltage!

 

 

 

 

 

 

 

2.

Bad electrical connections

2.

Check electrical wiring and connections.

 

 

 

 

See Wiring Diagram, page 25

3.

Electrical short in ignitor

3.

Check ignitor wiring. If no problems are

 

 

 

 

found, replace ignitor (see page 9)

 

 

 

 

ON/OFF switch light comes on when switch 1.

Electrical short in motor

1.

Check motor wiring. If no problems are

is turned to the ON (|) position but turns off

 

 

 

found, replace motor

after five seconds

 

 

 

 

 

 

 

WARNING: High voltage!

 

 

 

 

 

 

 

 

 

 

 

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7

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

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.Wash 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.Wash fuel filter with clean fuel and replace in tank.

6.Attach upper fuel line to fuel filter neck.

7.Replace side cover.

Upper Shell

Upper

 

Shell

 

Fan

 

Guard

Fan

Guard

Figure 7 - Upper Shell Removal, 35/50/

Figure 8 - Upper Shell Removal, 100/

70,000 Btu/Hr Models

150,000 Btu/Hr Models

Fuel Filter

 

Side Cover

Fuel Line

Figure 9 - Fuel Filter Removal, 35/50/70,000 Btu/Hr Models

Fuel Filter, Bushing,

and Lower Fuel Line

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

Nozzle

Chamber

Adapter

 

Bracket

 

Ignitor

Air

Ignitor

Line

Wires

Hose

 

Fuel

 

Line

 

Hose

 

Photocell

Ignition

Control

Bracket

Assembly

Photocell

 

Assembly

 

Side Cover

 

Figure 11 - Disconnecting Ignitor Wires from Ignition Control Assembly

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:Donotbendorstrike

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). Torque .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).

Ignitor

Ignitor

Element

Nozzle

Photocell

Adapter

Bracket

Bracket

 

Combustion

Nozzle Adapter

Bracket Opening

Chamber

 

Figure 12 - Ignitor Replacement

Continued

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