Desa NTH70-2 Owner's Manual

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.

2 105787

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 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.

Upper Shell

Lower

Shell

Fuel Cap

Fan Guard

Fuel Tank

Side Cover

Figure 2 - 100/150,000 Btu/Hr Models


Power Cord

105787 3


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

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)

Screw

Hot Air

Outlet

Rear

Handle

Air

Inlet

Fuel Tank

Flange

Wheel

Support

Frame

Wheel

Cap Nut

Nut

Figure 3 - Wheel and Handle Assembly

Axle

Extended

Hub

4 105787


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

mm 2 (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.

Combustion Chamber

Ignitor

Motor

Fan

Air Pump

Air Intake

Filter

|

O


Clean

Heated

Air Out

Fuel

Tank

Nozzle

Air For Fuel System

Fuel

Filter

Air For Combustion

And Heating

Figure 4 - Cross Section Operational View

Air Line

To Burner

Cool

Air

In

Air

Output

Filter

Ignition Control

Assembly

Fuel

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

Btu/Hr Models

|

O


Figure 6 - ON/OFF Switch, 100/150,000

Btu/Hr Models

105787 5


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

MAINTENANCE

SCHEDULE

Item

Fuel tank

Air output and lint filters

Air intake filter

Fuel filter

Ignitor

Fan blades

Motor

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

Severe burns and electrical shock can occur.

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 lubricated

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

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

Motor does not start five seconds after heater is plugged in (ON/OFF switch light remains on)

POSSIBLE CAUSE

1. Bad electrical connection between motor and ignition control assembly or ignition control assembly and power cord

REMEDY

1. Check all electrical connections. See

Wiring Diagram, page 25

2. Binding pump rotor

3. Defective ignition control assembly

4. Defective motor

WARNING: High voltage!

2. If fan does not turn freely, see Pump

Rotor, page 12

3. Replace ignition control assembly

4. Replace motor

6 105787


TROUBLESHOOTING

Continued

FAULT CONDITION

Motor starts and runs but heater does not ignite (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

REMEDY

1. Fill tank with kerosene

2. See Pump Pressure 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

Heater ignites but ignition control assembly shuts heater off after a short period of time

(ON/OFF switch light remains on)


6. Bad electrical connection between ignitor and ignition control assembly

7. Defective ignitor


6. Check electrical connections. See Wiring

Diagram, page 25

7. Replace ignitor, see page 9


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)

1. See Pump Pressure 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

6. Dirty photocell lens

7. Bad electrical connection between photocell and ignition control assembly

8. Defective photocell


1. No power to heater

6. Clean photocell lens

7. Check electrical connections. See Wiring

Diagram, page 25

8. Replace photocell


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

ON/OFF switch light comes on when switch is turned to the ON (|) position but turns off after five seconds

2. Bad electrical connections

3. Electrical short in ignitor


2. Check electrical wiring and connections.

See Wiring Diagram, page 25

3. Check ignitor wiring. If no problems are found, replace ignitor (see page 9)

1. Electrical short in motor 1. Check motor wiring. If no problems are found, replace motor


105787 7


SERVICE

PROCEDURES

Upper Shell

Fan

Guard

Upper

Shell

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.

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

Fan

Guard

Figure 7 - Upper Shell Removal, 35/50/

70,000 Btu/Hr Models

Figure 8 - Upper Shell Removal, 100/

150,000 Btu/Hr Models

Upper Fuel

Line

Side Cover

Figure 10 - Fuel Filter Removal, 100/150,000 Btu/Hr Models

8 105787


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).

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).

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.

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

Combustion

Chamber

Nozzle

Adapter

Bracket

Ignitor

Ignitor

Wires

Ignitor Screw/Washer

Assembly

Photocell

Bracket

Ignitor

Element

Ignitor

Nozzle

Adapter

Bracket Fuel

Line

Hose

Photocell

Bracket

Photocell

Assembly

Side Cover

Ignition

Control

Assembly

Figure 11 - Disconnecting Ignitor Wires from Ignition Control Assembly

Combustion

Chamber

Nozzle Adapter

Bracket Opening

Figure 12 - Ignitor Replacement

Continued

105787 9


SERVICE

PROCEDURES

Continued

AIR OUTPUT, AIR INTAKE,

AND LINT FILTERS

1.

Remove upper shell (see page 8).

2.

Remove filter end cover screws using

5/16" nut-driver.

3.

Remove filter end cover.

4.

Replace air output and lint filters.

5.

Wash or replace air intake filter (see

Preventative Maintenance Schedule, page 6).

6.

Replace filter end cover.

7.

Replace fan guard and upper shell.

IMPORTANT: Do not oil filters

PUMP PRESSURE

ADJUSTMENT

1.

Remove pressure gauge plug and plastic cap (35/50/70,000 Btu/Hr Models only) from filter end cover.

2.

Install accessory pressure gauge (part number HA1180).

3.

Start heater (see Operation, page 5).

Allow motor to reach full speed.

4.

Adjust pressure. Turn relief valve to right to increase pressure. Turn relief valve to left to decrease pressure. See specifications below for correct pressure for each model.

5, Remove pressure gauge. Replace pressure gauge plug and plastic cap (35/50/

70,000 Btu/Hr Models only) in filter end cover.

Air Intake Filter

Lint Filter

Air Output

Filter

Air Intake Filter

Lint Filter

Air Output

Filter

Filter End

Cover

Figure 13 - Air Output, Air Intake, and Lint Filters, 35/50/70,000 Btu/Hr Models

Filter End

Cover

Fan Guard

Fan Guard

Figure 14 - Air Output, Air Intake, and Lint Filters, 100/150,000 Btu/Hr Models

Pressure

Gauge

Plug

Relief

Valve

Model

NTH35-2

NTH50-2

NTH70-2

NTH100-2

NTH150-2

Pump

Pressure

(PSI/Bar)

2.9/0.200

3.9/0.270

4.9/0.338

4.9/0.338

5.5/0.380

Plastic Cap

Figure 15 - Pressure Gauge Plug and

Plastic Cap Removal

(35/50/70,000 Btu/Hr Models Shown)

Pressure

Gauge

Figure 16 - Adjusting Pump Pressure

105787 10


SERVICE

PROCEDURES

Continued

NOZZLE ASSEMBLY

1.


2.

Remove fan (see page 13).

3.

Remove fuel and air line hoses from nozzle assembly (see Figure 17, 18, or 19).

4.

Turn nozzle assembly 1/4 turn to left and pull toward motor to remove (see

Figure 20).

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 21).

7.

Blow compressed air through face of nozzle. This will free any dirt in nozzle area.

8.

Inspect nozzle seal 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 Nm (40 to 45 in-lbs). See Figure 21.

10. Attach nozzle assembly to burner strap.

11. Attach fuel and airline hoses to nozzle assembly. See Fuel and Airline Re-

placement and Proper Routing.

12. Replace fan (see page 13).

13. Replace fan guard and upper shell (see page 8).

Combustion

Chamber

Combustion

Chamber

Nozzle Adapter

Bracket

Air Line

Hose

Nozzle/

Adapter

Assembly

Photocell Bracket

Fuel Line

Hose

Figure 18 - Removing Air and Fuel Line

Hoses (100,000 Btu/Hr Model Only)

Combustion

Chamber

Nozzle Adapter

Bracket

Photocell

Bracket

Air Line

Hose

Nozzle/

Adapter

Assembly

Fuel Line Hose


Hoses (150,000 Btu/Hr Model Only)

Combustion

Chamber Nozzle/

Adapter

Assembly

Nozzle

Adapter

Bracket

Photocell

Bracket

Figure 20 - Removing Nozzle/Adapter

Assembly

Nozzle Face

Nozzle/

Adapter

Assembly Nozzle Seal

Air Line

Hose

Fuel Line Hose


Hoses (35/50/70,000 Btu/Hr Models Only)

Nozzle

Nozzle Adapter

Air Line Fitting

Fuel Line Fitting

Figure 21 - Nozzle and Nozzle Adapter

105787 11

FUEL AND AIR LINE

REPLACEMENT AND

PROPER ROUTING

1.


2.

Remove side cover screws using 5/16" nut driver.

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 17, 18, or 19) and from fuel filter (see page 8). If air line hose is damaged, disconnect from nozzle adapter (see Figure

17, 18, or 19) and from barb fitting on pump end cover (see Figure 22).

5.

Install new air and/or fuel line. Attach one end of air line hose to barb fitting on pump end cover (see Figure 22) and the other end to nozzle adapter (see

Figure 17, 18, or 19). Attach one end of fuel line hose to fuel filter (see page

8) and the other end to nozzle adapter

(see Figure 17, 18, or 19).

For 35/50/70,000 Btu/Hr model heaters, route air and fuel lines approximately as shown in Figure 17.

Note: Hoses are not to be touching photocell bracket.

For 100,000 Btu/Hr model heater, route air and fuel lines approximately as shown in Figure 18.

Note: Hoses are not to be touching photocell bracket.

For 150,000 Btu/Hr model heater, route air and fuel lines approximately as shown in Figure 19.

Note: Hoses are not to be touching photocell bracket

6.

Replace side cover.

7.

Replace upper shell and fan guard (see page 8).

Air Hose

Pump End Cover

Barb Fitting

Figure 22 - Air Hose to Barb FItting


SERVICE

PROCEDURES

Continued

PUMP ROTOR

(Procedure if Rotor is Binding)

1.


2.

Remove filter end cover screws using

5/16" nut-driver.

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.

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 25).

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.

12. Adjust pump pressure (see page 10).

Note: If rotor is still binding, proceed as follows.

13. Perform steps 1 through 6 above.

14. Place fine grade sandpaper (600 grit) on flat surface. Sand rotor lightly in

“figure 8” motion four times (see Figure 26).

15. Reinstall insert and rotor.

16. Perform steps 10 through 12 above.

Insert

Rotor

Air Output

Filter

Insert

Rotor

Air Output

Filter

Air

Intake

Filter

Filter End

Cover

Figure 24 - Rotor Location, 100/150,000 Btu/Hr Models

Gap Adjusting

Screw

Blade

Blade

Pump

Plate

Figure 23 - Rotor Location, 35/50/70,000 Btu/Hr Models

Blade

Pump

Plate

Fan Guard

Air Intake Filter

Filter End

Cover

.076/.101 mm (.003"/.004") Gap

Measured With Feeler Gauge

Fan Guard

Rotor

Sandpaper

Gap Adjusting

Screw

Figure 25 - Gap Adjusting Screw Locations

Figure 26 - Sanding Rotor

12 105787

Side Cover


Installing the New Assembly

SERVICE

PROCEDURES

Continued

FAN

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.

1.


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 28).

7.

Place setscrew on flat of shaft. Tighten setscrew firmly 4.5 to 5.6 N-m (40 to

50 in-lbs).

8.

Replace fan guard and upper shell.

Fan

Setscrew

IGNITION CONTROL

ASSEMBLY

WARNING: Unplug heater before servicing.

Remove Old Assembly

1.

Using the 5/16" nut driver or socket wrench, remove the four side cover screws (see Figure 29).

2.

Disconnect the nine wires from the ignition control assembly.

3.

Using needle nose pliers, squeeze the tab on the printed circuit board support and lift up on the edge of the ignition control assembly (see Figure 30). Repeat this for the other four printed circuit board supports then remove the assembly.

Side

Cover

Figure 29 - Removing Cover

CAUTION: Ignition control assembly contains electrostatic components. Handle the assembly by the edges of the printed circuit board. Do not touch any of the quick connect terminals or electronic components.

1.

Align the five holes in the assembly with the five printed circuit board supports in the side cover.

2.

Holding the assembly by the edges of the printed circuit board, apply downward pressure until all five tabs on the printed circuit board supports springlock into place. Pull up on assembly to verify this

(see Figure 31).

3.

Connect the nine wire leads to the ignition control assembly as shown in the wiring diagram on page 25.

CAUTION: Double check connections. Connecting ignition control assembly wrong could result in damage to the ignition control assembly and/ or other components in the heater assembly.

4.

Using the 5/16" nut driver or socket wrench reinstall side cover to heater.

Tighten screws until snug. Do not over torque!

Unacceptable

Unacceptable

Acceptable

Acceptable

Motor

Shaft

Figure 27 - Fan, Motor Shaft, and Setscrew

Location

Fan

Ignition

Control

Assembly

Printed Circuit

Board Supports (5)

Figure 30 - Removing Circuit Board

Flush

Motor

Shaft

Setscrew

Figure 31 - Attaching Circuit Board to

Tabs

Figure 28 - Fan Cross Section

105787 13


ILLUSTRATED

PARTS

BREAKDOWN

NTH35-2

35,000 BTU/HR MODEL

4

5

1

36

3

9

7

8

6

21

26

10

20

18

22

11

2

16

23

9-4

9-3

12

9-1

9-2 9-6

9-5

13

24

28

37

30

29

39

27

38

25

35

34

12-1

12-2 17

19

12-3

12-4

12-5

12-6

12-18

12-17

12-16

12-15

12-14

12-7

32

Motor and Pump Assembly

12-12

33

12-8

12-9

12-13

12-10

12-19

12-11

31

14

40

15

14

41

43

42

105787


PARTS LIST

NTH35-2


This list contains replaceable parts used in your heater. When ordering parts, be sure to provide the correct model and serial numbers (from the model plate), then the part number and description of the desired part.

KEY

NO.

PART

NUMBER

6

7

4

5

1

2

3

8

9

9-1

9-2

9-3

9-4

9-5

9-6

M51104-01

098511-256

M11084-29

102432-01

098512-63

M10908-2

103154-03

M16656-24

∗∗

HA3006

102548-05

104056-01

102336-01

M10908-75

103347-01

10 102431-01

11

12

103684-01

∗∗

12-1 102001-25

12-2 079975-03

12-3 M22009

12-4 M22456-2

12-5 M29608

12-6 M29632

12-7 M29633

12-8 M29609

12-9 M12461-31

12-10 M27694

12-11 M10993-1

12-12 M22997

12-13 M8940

12-14 M29612-01

12-15 M12461-32

12-16 103676-01

12-17 M8643-2

12-18 FHPF3-6C

12-19 105780-01

13 M51105-01

DESCRIPTION

Handle

Upper Shell

Screw, #10-16 x 3/4"

Screw/Lockwasher, 1/2"

Combustion Chamber

Screw, #6-32 x 3/8"

Photocell Bracket

Photocell Assembly

Burner Strap Assembly

Nozzle Assembly

Ignitor Kit

Nozzle Adapter

Nozzle Adapter Bracket

Screw, #6-32 x 7/8"

Belleville Washer


Fan

Motor and Pump Assembly

Motor

Pump Body

Insert

Rotor

Pump End Cover

Lint Filter

Intake Filter

Filter End Cover

Screw, #10-32 x 1"

Adjusting Screw

Pressure Relief Spring

Plug

Steel Ball, 1/4" Diameter

Output Filter

Screw #10-32 x 1 1 /

8

"

Nylon Elbow, 90

°

Blade

Screw, #10-32 x 3/4"

Plastic Cap

Fan Guard

∗∗

Not available as an assembly; order parts separately

KEY

NO.

35

36

37

38

31

32

33

34

39

40

41

42

43

22

23

24

25

26

27

28

29

30

14

15

16

17

18

19

20

21

QTY.

1

1

1

1

1

3

1

1

1

1

1

1

1

1

2

1

2

1

1

1

4

1

6

1

1

1

1

1

1

1

1

2

1

6

1

1

1

2

PART

NUMBER

098872-04

M50400

NTC-4C

102431-01

M50631

097461-09

101205-01

M30865-02

M11271-8

M50104-02

102431-01

RF3-4B

098511-237

M50814-06

M29652-05

108060-01

M10990-3

102861-01

102349-01

104068-04

097702-01

108088-01

M51108-01

NPF-3B

097785-01

WLE-3

079010-39

105793-01

079919-01

079010-40

DESCRIPTION

Power Cord

Strain Relief Bushing

Hex Lock Nut, 1/4-20


Rubber Bumper

Side Cover

Motor Bracket

Bushing

Clip Nut

Bushing


Screw, #10-32 x 1/2"

Lower Shell

Rubber Airline

Fuel Line

Fuel Filter

Rubber Bushing

Nylon Locknut

PCB Support

Ignition Control Assembly

Fuel Cap (Includes Gasket)

Fuel Tank

Shell Heat-Shield

Nut, #10-32

Vinyl Foam Gasket

Lockwasher, #10

Wire Assembly (Brown/White)

ON/OFF Switch

Switch Cover

Wire Assembly (White)

PARTS AVAILABLE - NOT SHOWN

HA2210

103814-01

104974-01

106013-01

105880-01

Filler Neck Screen

Wire Tie

Tradename Decal

Decal Package

Ignition Control Assembly Fuse

QTY.

3

1

1

1

1

1

1

5

1

1

1

1

1

1

1

1

6

1

6

1

1

1

2

1

1

2

4

1

1

1

1

1

2

1

1

105787 15


ILLUSTRATED

PARTS

BREAKDOWN

NTH50-2


4

5

1

36

3

9

7

8

6

21

26

10

20

18

22

11

2

16

23

9-4

9-3

12

9-1

9-2 9-6

9-5

13

24

28

37

30

29

39

27

38

25

35

34

12-1

12-2 17

19

12-3

12-4

12-5

12-6

12-18

12-17

12-16

12-15

12-14

12-7

32


12-12

33

12-8

12-9

12-13

12-10

12-19

12-11

31

16

40

15

14

41

43

42

105787


PARTS LIST

NTH50-2



KEY

NO.

PART

NUMBER

6

7

4

5

1

2

3

8

9

9-1

9-2

9-3

9-4

9-5

9-6

M51104-01

098511-256

M11084-29

102432-01

098512-67

M10908-2

103154-03

M16656-24

∗∗

100735-27

102548-05

104056-01

102336-01

M10908-75

103347-01

10 102431-01

11

12

103684-01

∗∗

12-1 102001-23

12-2 079975-02

12-3 M22009

12-4 M22456-1

12-5 M29608

12-6 M29632

12-7 M29633

12-8 M29609

12-9 M12461-31

12-10 M27694

12-11 M10993-1

12-12 M22997

12-13 M8940

12-14 M29612-01

12-15 M12461-31

12-16 103676-01

12-17 M8643

12-18 FHPF3-5C

12-19 105780-01

13 M51105-01

DESCRIPTION

Handle

Upper Shell

Screw, #10-16 x 3/4"


Combustion Chamber

Screw, #6-32 x 3/8"

Photocell Bracket

Photocell Assembly


Nozzle Assembly

Ignitor Kit

Nozzle Adapter


Screw, #6-32 x 7/8"

Belleville Washer


Fan


Motor

Pump Body

Insert

Rotor

Pump End Cover

Lint Filter

Intake Filter

Filter End Cover

Screw, #10-32 x 1"

Adjusting Screw


Plug


Output Filter

Screw #10-32 x 1"

Nylon Elbow, 90

°

Blade

Screw, #10-32 x 5/8"

Plastic Cap

Fan Guard

∗∗


KEY

NO.

31

32

33

34

35

36

25

26

27

28

29

30

37

38

39

40

41

42

43

19

20

21

22

23

24

14

15

16

17

18

QTY.

1

1

1

1

1

3

1

1

1

1

1

1

1

1

2

1

2

1

1

1

4

1

6

1

1

1

1

1

1

1

1

2

1

6

1

1

1

2

PART

NUMBER

098872-04

M50400

NTC-4C

102431-01

M50631

097461-09

101205-01

M30865-02

M11271-8

M50104-02

102431-01

RF3-4B

098511-237

M50814-06

M29652-05

108060-03

M10990-3

102861-01

102349-01

104068-04

097702-01

108088-03

M51108-01

NPF-3B

097785-01

WLE-3

079010-39

105793-01

079919-01

079010-40

DESCRIPTION

Power Cord




Rubber Bumper

Side Cover

Motor Bracket

Bushing

Clip Nut

Bushing


Screw, #10-32 x 1/2"

Lower Shell

Rubber Airline

Fuel Line

Fuel Filter

Rubber Bushing

Nylon Locknut

PCB Support



Fuel Tank

Shell Heat-Shield

Nut, #10-32

Vinyl Foam Gasket

Lockwasher, #10


ON/OFF Switch

Switch Cover



HA2210

103814-01

104974-01

106013-05

105880-01

Filler Neck Screen

Wire Tie

Tradename Decal

Decal Package


QTY.

1

5

1

1

1

1

1

1

1

1

1

1

1

1

1

1

3

1

1

1

1

1

6

1

6

1

1

2

4

2

1

1

2

1

1

105787 17


ILLUSTRATED

PARTS

BREAKDOWN

NTH70-2


4

5

1

36

3

9

7

8

6

21

26

10

20

18

22

11

2

16

23

9-4

9-3

12

9-1

9-2 9-6

9-5

13

24

28

37

30

29

39

27

38

25

35

34

12-1

12-2 17

19

12-3

12-4

12-5

12-6

12-18

12-17

12-16

12-15

12-14

12-7

32


12-12

33

12-8

12-9

12-13

12-10

12-19

12-11

31

18

40

15

14

41

43

42

105787


PARTS LIST

NTH70-2



KEY

NO.

PART

NUMBER

6

7

4

5

1

2

3

8

9

9-1

9-2

9-3

9-4

9-5

9-6

M51104-01

098511-256

M11084-29

102432-01

098512-64

M10908-2

103154-03

M16656-24

∗∗

HA3026

102548-05

104056-01

102336-01

M10908-75

103347-01

10 102431-01

11

12

103684-01

∗∗

12-1 102001-23

12-2 079975-02

12-3 M22009

12-4 M22456-1

12-5 M29608

12-6 M29632

12-7 M29633

12-8 M29609

12-9 M12461-31

12-10 M27694

12-11 M10993-1

12-12 M22997

12-13 M8940

12-14 M29612-01

12-15 M12461-31

12-16 103676-01

12-17 M8643

12-18 FHPF3-5C

12-19 105780-01

13 M51105-01

DESCRIPTION

Handle

Upper Shell

Screw, #10-16 x 3/4"


Combustion Chamber

Screw, #6-32 x 3/8"

Photocell Bracket

Photocell Assembly


Nozzle Assembly

Ignitor Kit

Nozzle Adapter


Screw, #6-32 x 7/8"

Belleville Washer


Fan


Motor

Pump Body

Insert

Rotor

Pump End Cover

Lint Filter

Intake Filter

Filter End Cover

Screw, #10-32 x 1"

Adjusting Screw


Plug


Output Filter

Screw #10-32 x 1"

Nylon Elbow, 90

°

Blade

Screw, #10-32 x 5/8"

Plastic Cap

Fan Guard

∗∗


KEY

NO.

31

32

33

34

35

36

25

26

27

28

29

30

37

38

39

40

41

42

43

19

20

21

22

23

24

14

15

16

17

18

QTY.

1

1

1

1

1

3

1

1

1

1

1

1

1

1

2

1

2

1

1

1

4

1

6

1

1

1

1

1

1

1

1

2

1

6

1

1

1

2

PART

NUMBER

098872-04

M50400

NTC-4C

102431-01

M50631

097461-09

101205-01

M30865-02

M11271-8

M50104-02

102431-01

RF3-4B

098511-237

M50814-06

M29652-05

108060-03

M10990-3

102861-01

102349-01

104068-04

097702-01

108088-03

M51108-01

NPF-3B

097785-01

WLE-3

079010-39

105793-01

079919-01

079010-40

DESCRIPTION

Power Cord




Rubber Bumper

Side Cover

Motor Bracket

Bushing

Clip Nut

Bushing


Screw, #10-32 x 1/2"

Lower Shell

Rubber Airline

Fuel Line

Fuel Filter

Rubber Bushing

Nylon Locknut

PCB Support



Fuel Tank

Shell Heat-Shield

Nut, #10-32

Vinyl Foam Gasket

Lockwasher, #10


ON/OFF Switch

Switch Cover



HA2210

103814-01

104974-01

106013-02

105880-01

Filler Neck Screen

Wire Tie

Tradename Decal

Decal Package


QTY.

1

5

1

1

1

1

1

1

1

1

1

1

1

1

1

1

3

1

1

1

1

1

6

1

6

1

1

2

4

2

1

1

2

1

1

105787 19


ILLUSTRATED

PARTS

BREAKDOWN

NTH100-2


2

3

1

28

4

6

24

30

20

22

21

31

5

23

7

19

8 11

25

18 26

15

12

9

10

42

41

27

7-4

7-5

29

16

7-1

7-2

7-6

7-3

10-1 43

35

10-2

10-3

10-4

10-5 36

10-6

32

10-7

10-17

10-16

10-15

10-13

10-14

10-13


10-12

10-8

14

17

10-9

10-10

10-11

20

37

13

14

38

33

34

44

39

40

105787


PARTS LIST

NTH100-2



KEY

NO.

PART

NUMBER DESCRIPTION

7

7-1

7-2

7-3

7-4

7-5

7-6

8

4

5

6

1

2

3

098511-257 Upper Shell

102432-01 Screw/Lockwasher, 1/2"

098512-65 Combustion Chamber

103971-01

M10908-2

Photocell Bracket

Screw, #6-32 x 3/8"

M16656-24 Photocell Assembly

**

HA3027


Nozzle Assembly

102548-05 Ignitor Kit

M10908-75 Screw, #6-32 x 7/8"

102336-01 Nozzle Adapter Bracket

104054-01 Nozzle Adapter

103347-01 Belleville Washer


9

10

102042-01

**

Fan


10-1 102001-24 Motor

10-2 079975-02 Pump Body

10-3 FHPF3-5C Screw, #10-32 x 5/8"

10-4 M22009 Rotor Insert

10-5 M22456-1 Pump Rotor

10-6 M50545 Pump End Cover

10-7 M12179 Intake Filter

10-8 M16545

10-9 M8940

Filter End Cover


10-10 M10993-1 Relief Spring

10-11 M27694

10-12 M22997

Adjusting Screw

Plug

10-13 M12461-31 Screw, #10-32 x 1"

10-14 M12244-1 Output Filter

10-15 M11637 Lint Filter

10-16 M50820-02 Barb Fitting

10-17 M8643 Blade

11 M50631 Rubber Bumper

12

13

14

101206-01

101695-01

104068-04

Motor Mounting Bracket

Button Plug


** Not available as an assembly; order parts separately

QTY.

1

1

10

1

1

1

1

1

1

1

2

1

1

1

1

1

1

1

1

1

1

4

2

1

1

2

1

1

1

1

1

1

2

1

1

8

1

KEY

NO.

39

40

41

42

43

44

34

35

36

37

38

29

30

31

32

33

21

22

23

24

25

26

27

28

15

16

17

18

19

20

PART


RF3-4B

108088-04

097702-01

102349-01

M50400

098872-04

M51077-15

102431-01

102861-01

079010-39

105793-01

079919-01

WLE-3

NPF-3B

097468-01

079010-40

NTC-4C Hex Lock Nut, 1/4-20

M51114-01 Fan Guard

M27417 Drain Plug (Includes “o” Ring)

099213-01 Button Plug

M51345-01 Fuel Line

107961-01 Fuel Filter

M51151-01 Fuel Line Tube

M10990-3 Rubber Bushing

M50814-03 Airline

098511-236 Lower Shell

M50104-03 Bushing

M50104-01 Bushing


M11271-8 Clip Nut

Screw, #10-32 x 1/2"

Fuel Tank


P.C. Board Support


Power Cord

Side Cover


Nylon Locknut


ON/OFF Switch

Switch Cover

Lockwasher, #10

Nut, #10-32

Edge Liner



HA2210

103814-01

104998-01

106013-03

105880-01

Filler Neck Screen

Wire Tie

Tradename Decal

Decal Package


QTY.

3

1

1

1

1

1

4

1

1

1

1

1

5

1

1

1

1

6

8

1

1

1

1

1

1

1

1

2

1

1

2

1

1

1

1

105787 21


ILLUSTRATED

PARTS

BREAKDOWN

NTH150-2


2

3

1

28

4

6

24

30

20

22

21

31

7

5

23

19

8 11

25

18 26

15

12

9

10

42

41

27

7-4

7-5

29

16

7-1

7-2

7-6

7-3

10-1

10-17

10-16

43

35

10-2

10-3

10-4

10-5 36

10-6

32

10-7

10-15

10-18

10-14

10-13


10-12

10-8

14

17

10-9

10-10

10-11

22

37

13

14

38

33

34

44

39

40

105787


PARTS LIST

NTH150-2



KEY

NO.

PART


3

4

1

2

5

6

7

7-1

098511-257 Upper Shell


098512-66

103154-05

M10908-2

Combustion Chamber

Photocell Bracket

Screw, #6-32 x 3/8"

M16656-24 Photocell Assembly

** Burner Strap Assembly

100735-24 Nozzle Assembly

7-2

7-3

7-4

8

9

7-5

7-6

10

102548-05

M10908-75

102336-01

Ignitor Kit

Screw, #6-32 x 7/8"


104054-01 Nozzle Adapter

103347-01 Belleville Washer

102431-01

102042-01

**


Fan


10-1 102001-24 Motor

10-2 079975-03 Pump Body

10-3 FHPF3-6C Screw, #10-32 x 3/4"

10-4 M22009 Rotor Insert

10-5 M22456-2 Pump Rotor

10-6 M50545 Pump End Cover

10-7 M12179 Intake Filter

10-8 M16545

10-9 M8940

Filter End Cover


10-10 M10993-1 Relief Spring

10-11 M27694 Adjusting Screw

10-12 M22997 Plug

10-13 M12461-31 Screw, #10-32 x 1"

10-14 M12244-1 Output Filter

10-15 M11637 Lint Filter

10-16 M50820-02 Barb Fitting

10-17 M8643-2 Blade

10-18 M12461-32 Screw, #10-32 x 1 1 /

8

"

11 M50631 Rubber Bumper

12

13

14

101206-01

101695-01

104068-04

Motor Mounting Bracket

Button Plug


** Not available as an assembly; order parts separately

QTY.

6

2

1

4

1

1

1

4

1

1

1

1

1

1

1

1

1

1

1

2

1

1

1

1

1

1

2

1

1

1

1

1

1

1

1

1

8

2

KEY

NO.

36

37

38

39

40

31

32

33

34

35

41

42

43

44

23

24

25

26

27

28

29

30

15

16

17

18

19

20

21

22

PART


097702-01

102349-01

M50400

098872-04

M51077-15

102431-01

102861-01

079010-39

105793-01

079919-01

WLE-3

NPF-3B

097468-01

079010-40

NTC-4C Hex Lock Nut, 1/4-20

M51114-01 Fan Guard

M27417

099213-01

Drain Plug (Includes “o” Ring)

Button Plug

M51345-04 Fuel Line

107961-01 Fuel Filter

M51151-02 Fuel Line Tube

M10990-3 Rubber Bushing

M50814-03 Airline

098511-236 Lower Shell

M50104-03 Bushing

M50104-01 Bushing


M11271-8

RF3-4B

108088-05

Clip Nut

Screw, #10-32 x 1/2"

Fuel Tank


P.C. Board Support


Power Cord

Side Cover


Nylon Locknut


ON/OFF Switch

Switch Cover

Lockwasher, #10

Nut, #10-32

Edge Liner



HA2210

103814-01

104998-01

106013-04

105880-01

Filler Neck Screen

Wire Tie

Tradename Decal

Decal Package


QTY.

1

1

4

1

1

1

1

1

5

1

1

1

1

3

8

1

1

6

1

1

1

1

1

1

1

1

1

2

1

1

2

1

1

1

1

105787 23


WHEELS AND

HANDLES

100,000 AND 150,000 BTU/HR

MODELS

KEY PART PART

NO. NUMBER DESCRIPTION

1 HA2203 Handles

HA2204 Handles

2 M12345-33 Screw, #10-24 x 1 3 /

4

"

3 M12342-3 Wheel Support Frame

M12831-3 Wheel Support Frame

4 NTC-3C Hex Nut, #10-24

5 107426-01 Wheel (Quantity of 2)

6 M28526 Cap Nut

7 M51015-01 Axle

M16801-2 Axle

100,000 Btu/Hr 150,000 Btu/Hr

QTY.

QTY.

—

8

1

2

2

—

8

1

1

—

—

2

8

—

1

8

1

2

—

1

1

2

3

6

5

4

24

7

105787


SPECIFICATIONS

Output Rating

(Btu/Hr\kw) 35,000(10) 50,000(15) 70,000(20) 100,000(30) 150,000(44)

Fuel Use Only Kerosene or No. 1 Fuel Oil

Fuel Tank Capacity

(U.S. Gal./Liters)

Fuel Consumption

(Gal. Per Hr./

Liters Per Hr.)

Electric Requirements

Amperage

(Normal Run)

Hot Air Output

(CFM/CMM)

RPM

3.0/11.4

5.0/18.9

5.0/18.9

9.0/34

.28/1.1

.8

140/4

1425

.37/1.40

.52/1.97

.79/3.0

240 V/50 Hz (Same All Models)

1.0

1.0

1.2

205/5.8

225/6.4

425/12

2850 2850 2850

13.5/51.1

1.1/4.1

1.2

500/14.2

2850

WIRING DIAGRAM

Power Plug

240 V/50Hz

Brown

1b

Blue

Green-Yellow

1

1a

ON/Off Switch

Ignitor

Photocell

Motor

Green-Yellow

(1) (2) (3) (4) (N) (5) (6)

Ignition Control

(7) (8)

105787 25


ACCESSORIES

Purchase accessories from your local dealer.

AIR GAUGE KIT - HA1180

For all models. Special tool to check pump pressure.

STANDARD WHEELS AND

HANDLE KIT - HA1206

Makes heater even more portable and convenient. Easy to assemble. For 35/50/70,000

Btu/Hr models.

HEAVY DUTY WHEELS AND

HANDLE KIT - HA1202

For heavy duty applications. Makes your heater even more portable and convenient.

For 35/50/70,000 Btu/Hr models.

A 008

IGNITION CONTROL

ASSEMBLY/PHOTOCELL

TESTER - HA1170

Special tool used to test the ignition control assembly and photocell.

26 105787


EC CONFORMITY

DECLARATION

EC CONFORMITY DECLARATION

NU-TOOL Group

Carcroft Industrial Estate,

Adwick-Le-Street

Doncoster KN6 7DU,

England

Manufacturer:

DESA International, Inc.

2701 Industrial Drive

Bowling Green, KY 42101 U.S.A.

Kerosene Portable Forced Air Heaters

Model Numbers: NTH35-2, NTH50-2, NTH70-2, NTH100-2, NTH150-2

It is declared that these models conform to the Machinery Directive 98/37/EC, including 91/368/EEC and the Low Voltage Directive 73/23/EEC. It is further declared that these models conform to the EMC Directive 89/336/EEC, amended by 92/31/EEC and including EN50081-1 and EN50082-1.

We declare that the models noted are in conformity.

Company

Name

Title

DESA International, Inc.

Keith Teakell

Vice President, Heating Products Engineering

06/13/2001 — Bowling Green, KY

Date and Place Signature

105787 27

WARRANTY INFORMATION

CERTIFICATE OF GENERAL

EQUIPMENT - LIMITED ONE YEAR WARRANTY

NU-TOOL warrants new Products sold by it to be free from defects in material or workmanship for a period of one year after date of delivery to the first user and subject to the following conditions:

NU-TOOL's obligation and liability under this Warranty is expressly limited to repairing or replacing at NU-TOOL's option, any parts which appear to NU-TOOL upon inspection to have been defective in material or workmanship when shipped from the factory. Such parts shall be provided at no cost to the user, at the business establishment of any factory authorized service center or the factory during regular working hours. The Warranty shall not apply to component parts or accessories of Products not manufactured by NU-TOOL and which carry the warranty of the manufacturer thereof, or to normal maintenance (such as pressure adjustments) or to normal maintenance parts (such as filters and spark plugs). Replacement or repair parts installed in the Product covered by this Warranty are warranted only for the remainder of this Warranty as if such parts were original components of said Product. NU-TOOL MAKES NO OTHER EX-

PRESS WARRANTY. TO THE EXTENT PERMITTED BY LAW

NU-TOOL MAKES NO IMPLIED WARRANTY AND MAKES

NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR

ANY PARTICULAR PURPOSE. IN ANY EVENT IMPLIED

WARRANTIES INCLUDING THOSE OF MERCHANTABIL-

ITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

LIMITED TO THE DURATION OF THIS EXPRESS WAR-

RANTY.

Any transportation charges, costs of installation, duty, taxes or any other charges whatsoever must be borne by the user. NU-TOOL's obligation under this limited Warranty shall not include any liability for direct, indirect, incidental, or consequential damage or delay. If requested by NU-TOOL, products or parts for which a warranty claim is made are to be returned transportation prepaid by user to the factory. Any improper use, including operation after discovery of defective or worn parts, operation beyond capacity, substitution of parts not approved by NU-TOOL, or any alteration or repair by others in such manner as in NU-TOOL's judgement affects the Product materially and adversely, shall void this Warranty.

NO EMPLOYEE OR REPRESENTATIVE IS AUTHORIZED

TO CHANGE THIS WARRANTY IN ANY WAY OR GRANT

ANY OTHER WARRANTY UNLESS SUCH CHANGE IS

MADE IN WRITING AND SIGNED BY AN OFFICER OF NU-

TOOL AT ITS HOME OFFICE.

WARRANTY SERVICE

Always specify model and serial numbers when communicating with the factory.

We reserve the right to amend these specifications at any time without notice. The only Warranty applicable is our standard written Warranty. We make no other Warranty, expressed or implied.

Printed in U.S.A.

105787 01

NOT A UPC

105787-01

Rev. D

12/01

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