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 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.

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 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:

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

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

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

(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

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

with Light

Figure 6 - ON/OFF Switch, 100/150,000 Btu/Hr Models

105787

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 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

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

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

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

105787

Continued

PORTABLE FORCED AIR HEATERS

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:

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 pres-

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

Do not oil filters

Air Intake Filter

Filter End Cover

Lint Filter

Air Output Filter

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

Air Intake Filter

Filter End Cover

Lint Filter

Air Output Filter

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

Pressure Gauge Plug

Relief Valve

Model (PSI/Bar)

NTH35-2 2.9/0.200 NTH50-2 3.9/0.270 NTH70-2 4.9/0.338 NTH100-2 4.9/0.338 NTH150-2 5.5/0.380

Fan Guard

Pump Pressure

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

OWNER’S MANUAL

SERVICE PROCEDURES

Continued

NOZZLE ASSEMBLY

1. Remove upper shell (see page 8).

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

Nozzle Adapter Bracket

Photocell Bracket

Nozzle/ Adapter Assembly

Air Line Hose

Fuel Line Hose

Figure 17 - Removing Air and Fuel Line Hoses (35/50/70,000 Btu/Hr Models Only)

Combustion Chamber

Nozzle Adapter Bracket

Air Line Hose

Photocell Bracket

Figure 18 - Removing Air and Fuel Line Hoses (100,000 Btu/Hr Model Only)

Combustion Chamber

Nozzle Adapter Bracket

Photocell Bracket

Air Line Hose

Fuel Line Hose

Figure 19 - Removing Air and Fuel Line Hoses (150,000 Btu/Hr Model Only)

Combustion Chamber

Figure 20 - Removing Nozzle/Adapter Assembly

Nozzle Face

Nozzle Seal

Nozzle

Nozzle Adapter

Air Line Fitting

Figure 21 - Nozzle and Nozzle Adapter

Nozzle/ Adapter Assembly

Fuel Line Hose

Nozzle/ Adapter Assembly

Fuel Line Fitting

FUEL AND AIR LINE REPLACEMENT AND PROPER ROUTING

1. Remove upper shell (see page 8).

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 pho-

tocell 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 pho-

tocell 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 pho-

tocell bracket

6. Replace side cover.

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

Pump End Cover

Barb Fitting

Air Hose

Figure 22 - Air Hose to Barb FItting

Continued

105787

PORTABLE FORCED AIR HEATERS

SERVICE PROCEDURES

Continued

PUMP ROTOR

(Procedure if Rotor is Binding)

1. Remove upper shell (see page 8).

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.

Blade

Pump Plate

Insert

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

Insert

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

Gap Adjusting Screw

Blade

Rotor

Air Output Filter

Blade

Rotor

Air Output Filter

.076/.101 mm (.003"/.004") Gap Measured With Feeler Gauge

Air Intake Filter

Filter End Cover

Pump Plate

Air Intake Filter

Fan Guard

Filter End Cover

Fan Guard

Rotor

Gap Adjusting Screw

Figure 25 - Gap Adjusting Screw Locations

Sandpaper

Figure 26 - Sanding Rotor

105787

OWNER’S MANUAL

SERVICE PROCEDURES

Continued

FAN

IMPORTANT:

shaft before removing motor from heater. The weight of the motor resting on the fan could damage the fan pitch.

1. Remove upper shell (see page 8).

2. Use 1/8" allen wrench to loosen set-

screw 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.

Setscrew

Remove fan from motor

Fan

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

Installing the New Assembly

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.

Motor Shaft

Figure 27 - Fan, Motor Shaft, and Setscrew Location

Fan

Flush

Motor Shaft

Setscrew

Figure 28 - Fan Cross Section

105787

Side Cover

Ignition Control Assembly

Figure 30 - Removing Circuit Board

Printed Circuit Board Supports (5)

4. Using the 5/16" nut driver or socket wrench reinstall side cover to heater. Tighten screws until snug. Do not over torque!

Unacceptable Acceptable

Figure 31 - Attaching Circuit Board to Tabs

PORTABLE FORCED AIR HEATERS

9-2

9-1

9-3

9-4

9-5

9-6

ILLUSTRATED PARTS BREAKDOWN

NTH35-2 35,000 BTU/HR MODEL

12-1

12-2

12-18

12-17

12-16

Motor and Pump Assembly

12-3

12-15

12-4

12-14

12-5

12-6

12-7

12-8

12-9

12-13

12-10

12-12

12-11

12-19

105787

OWNER’S MANUAL

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.

35,000 BTU/HR MODEL

KEY PART NO. NUMBER DESCRIPTION QTY.

1 M51104-01 Handle 1 2 098511-256 Upper Shell 1 3 M11084-29 Screw, #10-16 x 3/4" 2 4 102432-01 Screw/Lockwasher, 1/2" 6 5 098512-63 Combustion Chamber 1 6 M10908-2 Screw, #6-32 x 3/8" 2 7 103154-03 Photocell Bracket 1 8 M16656-24 Photocell Assembly 1 9 ∗∗ Burner Strap Assembly 1 9-1 HA3006 Nozzle Assembly 1 9-2 102548-05 Ignitor Kit 1 9-3 104056-01 Nozzle Adapter 1 9-4 102336-01 Nozzle Adapter Bracket 1 9-5 M10908-75 Screw, #6-32 x 7/8" 1 9-6 103347-01 Belleville Washer 1 10 102431-01 Screw/Lockwasher, 1/2" 2 11 103684-01 Fan 1 12 ∗∗ Motor and Pump Assembly 1 12-1 102001-25 Motor 1 12-2 079975-03 Pump Body 1 12-3 M22009 Insert 1 12-4 M22456-2 Rotor 1 12-5 M29608 Pump End Cover 1 12-6 M29632 Lint Filter 1 12-7 M29633 Intake Filter 1 12-8 M29609 Filter End Cover 1 12-9 M12461-31 Screw, #10-32 x 1" 3 12-10 M27694 Adjusting Screw 1 12-11 M10993-1 Pressure Relief Spring 1 12-12 M22997 Plug 1 12-13 M8940 Steel Ball, 1/4" Diameter 1 12-14 M29612-01 Output Filter 1 12-15 M12461-32 Screw #10-32 x 1 12-16 103676-01 Nylon Elbow, 90° 1 12-17 M8643-2 Blade 4 12-18 FHPF3-6C Screw, #10-32 x 3/4" 2 12-19 105780-01 Plastic Cap 1 13 M51105-01 Fan Guard 1

/8"6

KEY PART NO. NUMBER DESCRIPTION QTY.

14 098872-04 Power Cord 1 15 M50400 Strain Relief Bushing 1 16 NTC-4C Hex Lock Nut, 1/4-20 2 17 102431-01 Screw/Lockwasher, 1/2" 4 18 M50631 Rubber Bumper 2 19 097461-09 Side Cover 1 20 101205-01 Motor Bracket 1 21 M30865-02 Bushing 1 22 M11271-8 Clip Nut 6 23 M50104-02 Bushing 1 24 102431-01 Screw/Lockwasher, 1/2" 6 25 RF3-4B Screw, #10-32 x 1/2" 1 26 098511-237 Lower Shell 1 27 M50814-06 Rubber Airline 1 28 M29652-05 Fuel Line 1 29 108060-01 Fuel Filter 1 30 M10990-3 Rubber Bushing 1 31 102861-01 Nylon Locknut 1 32 102349-01 PCB Support 5 33 104068-04 Ignition Control Assembly 1 34 097702-01 Fuel Cap (Includes Gasket) 1 35 108088-01 Fuel Tank 1 36 M51108-01 Shell Heat-Shield 1 37 NPF-3B Nut, #10-32 3 38 097785-01 Vinyl Foam Gasket 1 39 WLE-3 Lockwasher, #10 1 40 079010-39 Wire Assembly (Brown/White) 1 41 105793-01 ON/OFF Switch 1 42 079919-01 Switch Cover 1 43 079010-40 Wire Assembly (White) 1

PARTS AVAILABLE - NOT SHOWN

HA2210 Filler Neck Screen 1 103814-01 Wire Tie 1 104974-01 Tradename Decal 2 106013-01 Decal Package 1 105880-01 Ignition Control Assembly Fuse 1

∗∗ Not available as an assembly; order parts separately

105787

PORTABLE FORCED AIR HEATERS

9-2

9-1

9-3

9-4

9-5

9-6

ILLUSTRATED PARTS BREAKDOWN

NTH50-2 50,000 BTU/HR MODEL

12-1

12-2

12-18

12-17

12-16

Motor and Pump Assembly

12-3

12-15

12-4

12-14

12-5

12-6

12-7

12-8

12-9

12-13

12-10

12-12

12-11

12-19

105787

OWNER’S MANUAL

PARTS LIST

NTH50-2

50,000 BTU/HR MODEL

KEY PART NO. NUMBER DESCRIPTION QTY.

1 M51104-01 Handle 1 2 098511-256 Upper Shell 1 3 M11084-29 Screw, #10-16 x 3/4" 2 4 102432-01 Screw/Lockwasher, 1/2" 6 5 098512-67 Combustion Chamber 1 6 M10908-2 Screw, #6-32 x 3/8" 2 7 103154-03 Photocell Bracket 1 8 M16656-24 Photocell Assembly 1 9 ∗∗ Burner Strap Assembly 1 9-1 100735-27 Nozzle Assembly 1 9-2 102548-05 Ignitor Kit 1 9-3 104056-01 Nozzle Adapter 1 9-4 102336-01 Nozzle Adapter Bracket 1 9-5 M10908-75 Screw, #6-32 x 7/8" 1 9-6 103347-01 Belleville Washer 1 10 102431-01 Screw/Lockwasher, 1/2" 2 11 103684-01 Fan 1 12 ∗∗ Motor and Pump Assembly 1 12-1 102001-23 Motor 1 12-2 079975-02 Pump Body 1 12-3 M22009 Insert 1 12-4 M22456-1 Rotor 1 12-5 M29608 Pump End Cover 1 12-6 M29632 Lint Filter 1 12-7 M29633 Intake Filter 1 12-8 M29609 Filter End Cover 1 12-9 M12461-31 Screw, #10-32 x 1" 3 12-10 M27694 Adjusting Screw 1 12-11 M10993-1 Pressure Relief Spring 1 12-12 M22997 Plug 1 12-13 M8940 Steel Ball, 1/4" Diameter 1 12-14 M29612-01 Output Filter 1 12-15 M12461-31 Screw #10-32 x 1" 6 12-16 103676-01 Nylon Elbow, 90° 1 12-17 M8643 Blade 4 12-18 FHPF3-5C Screw, #10-32 x 5/8" 2 12-19 105780-01 Plastic Cap 1 13 M51105-01 Fan Guard 1

KEY PART NO. NUMBER DESCRIPTION QTY.

14 098872-04 Power Cord 1 15 M50400 Strain Relief Bushing 1 16 NTC-4C Hex Lock Nut, 1/4-20 2 17 102431-01 Screw/Lockwasher, 1/2" 4 18 M50631 Rubber Bumper 2 19 097461-09 Side Cover 1 20 101205-01 Motor Bracket 1 21 M30865-02 Bushing 1 22 M11271-8 Clip Nut 6 23 M50104-02 Bushing 1 24 102431-01 Screw/Lockwasher, 1/2" 6 25 RF3-4B Screw, #10-32 x 1/2" 1 26 098511-237 Lower Shell 1 27 M50814-06 Rubber Airline 1 28 M29652-05 Fuel Line 1 29 108060-03 Fuel Filter 1 30 M10990-3 Rubber Bushing 1 31 102861-01 Nylon Locknut 1 32 102349-01 PCB Support 5 33 104068-04 Ignition Control Assembly 1 34 097702-01 Fuel Cap (Includes Gasket) 1 35 108088-03 Fuel Tank 1 36 M51108-01 Shell Heat-Shield 1 37 NPF-3B Nut, #10-32 3 38 097785-01 Vinyl Foam Gasket 1 39 WLE-3 Lockwasher, #10 1 40 079010-39 Wire Assembly (Brown/White) 1 41 105793-01 ON/OFF Switch 1 42 079919-01 Switch Cover 1 43 079010-40 Wire Assembly (White) 1

PARTS AVAILABLE - NOT SHOWN

HA2210 Filler Neck Screen 1 103814-01 Wire Tie 1 104974-01 Tradename Decal 2 106013-05 Decal Package 1 105880-01 Ignition Control Assembly Fuse 1

∗∗ Not available as an assembly; order parts separately

105787

PORTABLE FORCED AIR HEATERS

9-2

9-1

9-3

9-4

9-5

9-6

ILLUSTRATED PARTS BREAKDOWN

NTH70-2 70,000 BTU/HR MODEL

12-1

12-2

12-18

12-17

12-16

Motor and Pump Assembly

12-3

12-15

12-4

12-14

12-5

12-6

12-7

12-8

12-9

12-13

12-10

12-12

12-11

12-19

105787

OWNER’S MANUAL

PARTS LIST

NTH70-2

70,000 BTU/HR MODEL

KEY PART NO. NUMBER DESCRIPTION QTY.

1 M51104-01 Handle 1 2 098511-256 Upper Shell 1 3 M11084-29 Screw, #10-16 x 3/4" 2 4 102432-01 Screw/Lockwasher, 1/2" 6 5 098512-64 Combustion Chamber 1 6 M10908-2 Screw, #6-32 x 3/8" 2 7 103154-03 Photocell Bracket 1 8 M16656-24 Photocell Assembly 1 9 ∗∗ Burner Strap Assembly 1 9-1 HA3026 Nozzle Assembly 1 9-2 102548-05 Ignitor Kit 1 9-3 104056-01 Nozzle Adapter 1 9-4 102336-01 Nozzle Adapter Bracket 1 9-5 M10908-75 Screw, #6-32 x 7/8" 1 9-6 103347-01 Belleville Washer 1 10 102431-01 Screw/Lockwasher, 1/2" 2 11 103684-01 Fan 1 12 ∗∗ Motor and Pump Assembly 1 12-1 102001-23 Motor 1 12-2 079975-02 Pump Body 1 12-3 M22009 Insert 1 12-4 M22456-1 Rotor 1 12-5 M29608 Pump End Cover 1 12-6 M29632 Lint Filter 1 12-7 M29633 Intake Filter 1 12-8 M29609 Filter End Cover 1 12-9 M12461-31 Screw, #10-32 x 1" 3 12-10 M27694 Adjusting Screw 1 12-11 M10993-1 Pressure Relief Spring 1 12-12 M22997 Plug 1 12-13 M8940 Steel Ball, 1/4" Diameter 1 12-14 M29612-01 Output Filter 1 12-15 M12461-31 Screw #10-32 x 1" 6 12-16 103676-01 Nylon Elbow, 90° 1 12-17 M8643 Blade 4 12-18 FHPF3-5C Screw, #10-32 x 5/8" 2 12-19 105780-01 Plastic Cap 1 13 M51105-01 Fan Guard 1

KEY PART NO. NUMBER DESCRIPTION QTY.

14 098872-04 Power Cord 1 15 M50400 Strain Relief Bushing 1 16 NTC-4C Hex Lock Nut, 1/4-20 2 17 102431-01 Screw/Lockwasher, 1/2" 4 18 M50631 Rubber Bumper 2 19 097461-09 Side Cover 1 20 101205-01 Motor Bracket 1 21 M30865-02 Bushing 1 22 M11271-8 Clip Nut 6 23 M50104-02 Bushing 1 24 102431-01 Screw/Lockwasher, 1/2" 6 25 RF3-4B Screw, #10-32 x 1/2" 1 26 098511-237 Lower Shell 1 27 M50814-06 Rubber Airline 1 28 M29652-05 Fuel Line 1 29 108060-03 Fuel Filter 1 30 M10990-3 Rubber Bushing 1 31 102861-01 Nylon Locknut 1 32 102349-01 PCB Support 5 33 104068-04 Ignition Control Assembly 1 34 097702-01 Fuel Cap (Includes Gasket) 1 35 108088-03 Fuel Tank 1 36 M51108-01 Shell Heat-Shield 1 37 NPF-3B Nut, #10-32 3 38 097785-01 Vinyl Foam Gasket 1 39 WLE-3 Lockwasher, #10 1 40 079010-39 Wire Assembly (Brown/White) 1 41 105793-01 ON/OFF Switch 1 42 079919-01 Switch Cover 1 43 079010-40 Wire Assembly (White) 1

PARTS AVAILABLE - NOT SHOWN

HA2210 Filler Neck Screen 1 103814-01 Wire Tie 1 104974-01 Tradename Decal 2 106013-02 Decal Package 1 105880-01 Ignition Control Assembly Fuse 1

∗∗ Not available as an assembly; order parts separately

105787

PORTABLE FORCED AIR HEATERS

ILLUSTRATED PARTS BREAKDOWN

NTH100-2 100,000 BTU/HR MODEL

7-4

7-1

7-2

7-6

7-3

7-5

10-1

10-2

10-3

10-4

10-17

10-16

10-15

10-13

Motor and Pump Assembly

10-14

10-5

10-13

10-6

10-7

10-8

10-9

10-10

10-11

10-12

105787

OWNER’S MANUAL

PARTS LIST

NTH100-2

100,000 BTU/HR MODEL

KEY PART NO. NUMBER DESCRIPTION QTY.

1 098511-257 Upper Shell 1 2 102432-01 Screw/Lockwasher, 1/2" 8 3 098512-65 Combustion Chamber 1 4 103971-01 Photocell Bracket 1 5 M10908-2 Screw, #6-32 x 3/8" 2 6 M16656-24 Photocell Assembly 1 7 ** Burner Strap Assembly 1 7-1 HA3027 Nozzle Assembly 1 7-2 102548-05 Ignitor Kit 1 7-3 M10908-75 Screw, #6-32 x 7/8" 1 7-4 102336-01 Nozzle Adapter Bracket 1 7-5 104054-01 Nozzle Adapter 1 7-6 103347-01 Belleville Washer 1 8 102431-01 Screw/Lockwasher, 1/2" 2 9 102042-01 Fan 1 10 ** Motor and Pump Assembly 1 10-1 102001-24 Motor 1 10-2 079975-02 Pump Body 1 10-3 FHPF3-5C Screw, #10-32 x 5/8" 2 10-4 M22009 Rotor Insert 1 10-5 M22456-1 Pump Rotor 1 10-6 M50545 Pump End Cover 1 10-7 M12179 Intake Filter 1 10-8 M16545 Filter End Cover 1 10-9 M8940 Steel Ball, 1/4" Diameter 1 10-10 M10993-1 Relief Spring 1 10-11 M27694 Adjusting Screw 1 10-12 M22997 Plug 1 10-13 M12461-31 Screw, #10-32 x 1" 10 10-14 M12244-1 Output Filter 1 10-15 M11637 Lint Filter 1 10-16 M50820-02 Barb Fitting 1 10-17 M8643 Blade 4 11 M50631 Rubber Bumper 2 12 101206-01 Motor Mounting Bracket 1 13 101695-01 Button Plug 1 14 104068-04 Ignition Control Assembly 1

KEY PART NO. NUMBER DESCRIPTION QTY.

15 NTC-4C Hex Lock Nut, 1/4-20 2 16 M51114-01 Fan Guard 1 17 M27417 Drain Plug (Includes “o” Ring) 1 18 099213-01 Button Plug 1 19 M51345-01 Fuel Line 1 20 107961-01 Fuel Filter 1 21 M51151-01 Fuel Line Tube 1 22 M10990-3 Rubber Bushing 1 23 M50814-03 Airline 1 24 098511-236 Lower Shell 1 25 M50104-03 Bushing 1 26 M50104-01 Bushing 1 27 102431-01 Screw/Lockwasher, 1/2" 6 28 M11271-8 Clip Nut 8 29 RF3-4B Screw, #10-32 x 1/2" 1 30 108088-04 Fuel Tank 1 31 097702-01 Fuel Cap (Includes Gasket) 1 32 102349-01 P.C. Board Support 5 33 M50400 Strain Relief Bushing 1 34 098872-04 Power Cord 1 35 M51077-15 Side Cover 1 36 102431-01 Screw/Lockwasher, 1/2" 4 37 102861-01 Nylon Locknut 1 38 079010-39 Wire Assembly (Brown/White) 1 39 105793-01 ON/OFF Switch 1 40 079919-01 Switch Cover 1 41 WLE-3 Lockwasher, #10 1 42 NPF-3B Nut, #10-32 3 43 097468-01 Edge Liner 1 44 079010-40 Wire Assembly (White) 1

PARTS AVAILABLE - NOT SHOWN

HA2210 Filler Neck Screen 1 103814-01 Wire Tie 1 104998-01 Tradename Decal 2

106013-03 Decal Package 1 105880-01 Ignition Control Assembly Fuse 1

** Not available as an assembly; order parts separately

105787

PORTABLE FORCED AIR HEATERS

ILLUSTRATED PARTS BREAKDOWN

NTH150-2 150,000 BTU/HR MODEL

7-4

7-1

7-2

7-6

7-3

7-5

10-1

10-2

10-3

10-4

10-17

10-16

10-15

10-18

Motor and Pump Assembly

10-14

10-5

10-13

10-6

10-7

10-8

10-9

10-10

10-11

10-12

105787

OWNER’S MANUAL

PARTS LIST

NTH150-2

150,000 BTU/HR MODEL

KEY PART NO. NUMBER DESCRIPTION QTY.

1 098511-257 Upper Shell 1 2 102432-01 Screw/Lockwasher, 1/2" 8 3 098512-66 Combustion Chamber 1 4 103154-05 Photocell Bracket 1 5 M10908-2 Screw, #6-32 x 3/8" 2 6 M16656-24 Photocell Assembly 1 7 ** Burner Strap Assembly 1 7-1 100735-24 Nozzle Assembly 1 7-2 102548-05 Ignitor Kit 1 7-3 M10908-75 Screw, #6-32 x 7/8" 1 7-4 102336-01 Nozzle Adapter Bracket 1 7-5 104054-01 Nozzle Adapter 1 7-6 103347-01 Belleville Washer 1 8 102431-01 Screw/Lockwasher, 1/2" 2 9 102042-01 Fan 1 10 ** Motor and Pump Assembly 1 10-1 102001-24 Motor 1 10-2 079975-03 Pump Body 1 10-3 FHPF3-6C Screw, #10-32 x 3/4" 2 10-4 M22009 Rotor Insert 1 10-5 M22456-2 Pump Rotor 1 10-6 M50545 Pump End Cover 1 10-7 M12179 Intake Filter 1 10-8 M16545 Filter End Cover 1 10-9 M8940 Steel Ball, 1/4" Diameter 1 10-10 M10993-1 Relief Spring 1 10-11 M27694 Adjusting Screw 1 10-12 M22997 Plug 1 10-13 M12461-31 Screw, #10-32 x 1" 4 10-14 M12244-1 Output Filter 1 10-15 M11637 Lint Filter 1 10-16 M50820-02 Barb Fitting 1 10-17 M8643-2 Blade 4 10-18 M12461-32 Screw, #10-32 x 1 11 M50631 Rubber Bumper 2 12 101206-01 Motor Mounting Bracket 1 13 101695-01 Button Plug 1 14 104068-04 Ignition Control Assembly 1

/8"6

KEY PART NO. NUMBER DESCRIPTION QTY.

15 NTC-4C Hex Lock Nut, 1/4-20 2 16 M51114-01 Fan Guard 1 17 M27417 Drain Plug (Includes “o” Ring) 1 18 099213-01 Button Plug 1 19 M51345-04 Fuel Line 1 20 107961-01 Fuel Filter 1 21 M51151-02 Fuel Line Tube 1 22 M10990-3 Rubber Bushing 1 23 M50814-03 Airline 1 24 098511-236 Lower Shell 1 25 M50104-03 Bushing 1 26 M50104-01 Bushing 1 27 102431-01 Screw/Lockwasher, 1/2" 6 28 M11271-8 Clip Nut 8 29 RF3-4B Screw, #10-32 x 1/2" 1 30 108088-05 Fuel Tank 1 31 097702-01 Fuel Cap (Includes Gasket) 1 32 102349-01 P.C. Board Support 5 33 M50400 Strain Relief Bushing 1 34 098872-04 Power Cord 1 35 M51077-15 Side Cover 1 36 102431-01 Screw/Lockwasher, 1/2" 4 37 102861-01 Nylon Locknut 1 38 079010-39 Wire Assembly (Brown/White) 1 39 105793-01 ON/OFF Switch 1 40 079919-01 Switch Cover 1 41 WLE-3 Lockwasher, #10 1 42 NPF-3B Nut, #10-32 3 43 097468-01 Edge Liner 1 44 079010-40 Wire Assembly (White) 1

PARTS AVAILABLE - NOT SHOWN

HA2210 Filler Neck Screen 1 103814-01 Wire Tie 1 104998-01 Tradename Decal 2

106013-04 Decal Package 1 105880-01 Ignition Control Assembly Fuse 1

** Not available as an assembly; order parts separately

105787

PORTABLE FORCED AIR HEATERS

WHEELS AND HANDLES

100,000 AND 150,000 BTU/HR MODELS

KEY PART PART 100,000 Btu/Hr 150,000 Btu/Hr NO. NUMBER DESCRIPTION QTY. QTY.

1 HA2203 Handles 2 —

HA2204 Handles — 2 2 M12345-33 Screw, #10-24 x 1 3/4"8 8 3 M12342-3 Wheel Support Frame 1 —

M12831-3 Wheel Support Frame — 1 4 NTC-3C Hex Nut, #10-24 8 8 5 107426-01 Wheel (Quantity of 2) 1 1 6 M28526 Cap Nut 2 2 7 M51015-01 Axle 1 —

M16801-2 Axle — 1

105787

OWNER’S MANUAL

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) 3.0/11.4 5.0/18.9 5.0/18.9 9.0/34 13.5/51.1 Fuel Consumption

(Gal. Per Hr./ Liters Per Hr.) .28/1.1 .37/1.40 .52/1.97 .79/3.0 1.1/4.1

Electric Requirements 240 V/50 Hz (Same All Models) Amperage

(Normal Run) .8 1.0 1.0 1.2 1.2 Hot Air Output

(CFM/CMM) 140/4 205/5.8 225/6.4 425/12 500/14.2 RPM 1425 2850 2850 2850 2850

WIRING DIAGRAM

Power Plug 240 V/50Hz

Green-Yellow

Photocell

Blue

(2)(1)

Brown

Blue

White

Blue

(3) (4) (6)

White

(N)

Blue

(5)

Ignition Control

Green-Yellow

Motor

Brown/White

Red

ON/Off Switch

(7)

Ignitor

Black

(8)

Black

105787

PORTABLE FORCED AIR HEATERS

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.

105787

EC CONFORMITY DECLARATION

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

OWNER’S MANUAL

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

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 DESA International, Inc. Name Keith T eakell Title Vice President, Heating Products Engineering

06/13/2001 — Bowling Green, KY

Date and Place Signature

105787

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 EXPRESS 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

WARRANTY SERVICE

WARRANTIES INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE LIMITED TO THE DURATION OF THIS EXPRESS WARRANTY.

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 NUTOOL AT ITS HOME OFFICE.

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.

105787 01

NOT A UPC

Printed in U.S.A.

105787-01 Rev. D 12/01

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

Specifications and Main Features

Frequently Asked Questions

User Manual