PORTABLE
FORCED
AIR HEATERS
OWNER’S MANUAL
Heater Sizes: 35,000 50,000 70,000
100,000 150,000 Btu/Hr
Models: NTH35, NTH50, NTH70, NTH100, and NTH150
IMPORTANT: Read and understand this manual before assembling, starting or servicing heater. Improper use of heater can cause serious injury.
Keep this manual for future reference.
PORTABLE FORCED AIR HEATERS
SAFETY
INFORMATION
WARNINGS
IMPORTANT: Read this Owner’s
Manual carefully and completely
before trying to assemble, operate, or service this heater. Improper use of this heater can
cause serious injury or death from
burns, fire, explosion, electrical
shock, and carbon monoxide
poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs
of carbon monoxide poisoning resemble the
flu, with headaches, dizziness, and/or nausea. If you have these signs, the heater may
not be working properly. Get fresh air at
once! Have heater serviced. Some people
are more affected by carbon monoxide than
others. These include pregnant women, persons with heart or lung disease or anemia,
those under the influence of alcohol, and
those at high altitudes.
Make certain you read and understand all
Warnings. Keep this manual for reference.
It is your guide to safe and proper operation
of this heater.
• Use only kerosene or No. 1 fuel oil to
avoid risk of fire or explosion. Never use
gasoline, naphtha, paint thinners, alcohol,
or other highly flammable fuels.
• Fueling
a) Personnel involved with fueling shall
be qualified and thoroughly familiar
with the manufacturer's instructions
and applicable regulations regarding
the safe fueling of heating units.
b) Only the type of fuel specified on the
heater's data plate shall be used.
c) All flame, including the pilot light, if
any, shall be extinguished and the
heater allowed to cool, prior to
fueling.
d) During fueling, all fuel lines and fuel-
line connections shall be inspected for
leaks. Any leaks shall be repaired
prior to returning the heater to service.
e) At no time shall more than one day's
supply of heater fuel be stored inside
a building in the vicinity of the heater.
Bulk fuel storage shall be outside the
structure.
f) All fuel storage shall be located a
minimum of 762cm (25 feet) from
heaters, torches, welding equipment,
and similar sources of ignition
(exception: the fuel reservoir integral
with the heater unit).
g) Whenever possible, fuel storage shall
be confined to areas where floor
penetrations do not permit fuel to drip
onto or be ignited by a fire at lower
elevation.
h) Fuel storage shall be in accordance
with the authority having jurisdiction.
• Never use heater where gasoline, paint
thinner, or other highly flammable vapors
are present.
• Follow all local ordinances and codes
when using heater.
• Heaters used in the vicinity of tarpaulins,
canvas, or similar enclosure materials
shall be located a safe distance from such
materials. The recommended minimum
safe distance is 304.8cm (10 feet). It is
further recommended that these enclosure materials be of a fire retardant nature. These enclosure materials shall be
securely fastened to prevent them from
igniting or from upsetting the heater due
to wind action.
• Use only in well-vented areas. Before using heater, provide at least a 2800 square
cm (three-square-foot) opening of fresh,
outside air for each 100,000 Btu/Hr of
rating.
• Use only in places free of flammable vapors or high dust content.
• Use only the electrical voltage and frequency specified on model plate.
• Use only a three-prong, grounded extension cord.
• Minimum heater clearances from combustibles:
Outlet: 250 cm (8 Ft.)
Sides, Top, and Rear: 125 cm (4 Ft.)
• Locate heater on a stable and level surface if heater is hot or running or a fire
may occur.
• When moving or storing heater, keep
heater in a level position or fuel spillage
may occur.
• Keep children and animals away from
heater.
• Unplug heater when not in use.
• When used with thermostat, heater may
start anytime.
• Never use heater in living or sleeping
areas.
• Never block air inlet (rear) or air outlet
(front) of heater.
• Never move, handle, refuel, or service a
hot, operating, or plugged-in heater.
• Never attach duct work to front or rear
of heater.
2
104976
OWNER’S MANUAL
PRODUCT
IDENTIFICATION
Hot Air Outlet
Upper Shell
Lower Shell
Fuel Tank
Side Cover
ON/OFF Switch
Flame-Out Control
Reset Button
Figure 1 - 35/50/70,000 Btu/Hr Models
Power
Cord
Handle
Fan Guard
Air Filter
End Cover
Fuel Cap
UNPACKING
1. Remove all packing items applied to
heater for shipment.
2. Remove all items from carton.
3. Check items for any shipping damage.
If heater is damaged, promptly inform
dealer where you bought heater.
FUELS
WARNING: Use only kerosene
or No. 1 fuel oil to avoid risk of fire
or explosion. Never use gasoline,
naphtha, paint thinners, alcohol
or other highly flammable fuels.
Do not use heavy fuels such as No. 2 fuel oil
or No. 2 Diesel. Using heavy fuels will
result in:
• clogged fuel filter and nozzle
• carbon build up on spark plug
• use of non-toxic anti-icer in fuel during
very cold weather
Hot Air Outlet
Lower
Shell
Fuel Cap
Side Cover
Figure 2 - 100/150,000 Btu/Hr Models
Upper Shell
ON/OFF Switch
Fan Guard
Fuel Tank
Flame-Out
Control Reset
Button
Power Cord
IMPORTANT:
Use a KEROSENE ONLY
container. Be sure storage container is clean.
Foreign matter such as rust, dirt, or water
will cause the flame-out control to shut
down heater. Foreign matter may also require you to clean fuel system often.
104976
3
PORTABLE FORCED AIR HEATERS
ASSEMBLY
(FOR 100,000 AND 150,000
BTU/HR MODELS ONLY)
These models are furnished with wheels and
handles. Wheels, handles, and the mounting
hardware are found in the shipping carton.
Tools Needed
• Medium Phillips Screwdriver
• 3/8" Open or Adjustable Wrench
• Hammer
1. Slide axle through wheel support
frame. Install wheels on axle.
IMPORTANT:
point extended hub of wheels toward
wheel support frame (see Figure 3).
When installing wheels,
2. Place cap nuts on axle ends. Gently tap
with hammer to secure.
3. Place heater on wheel support frame.
Make sure air inlet end (rear) of heater
is over wheels. Line up holes on fuel
tank flange with holes on wheel support frame.
4. Place front handle and rear handle on
top of fuel tank flange. Insert screws
through handles, fuel tank flange, and
wheel support frame. Attach nut finger
tight after each screw is inserted.
5. After all screws are inserted, tighten
nuts firmly.
Front Handle
VENTILATION
WARNING: Follow the minimum fresh, outside air ventilation
requirements. If proper fresh, outside air ventilation is not provided,
carbon monoxide poisoning can
occur. Provide proper fresh, outside air ventilation before running
heater.
Provide a fresh air opening of at least 2800
square cm (three square feet) for each
100,000 Btu/Hr rating. Provide extra fresh
air if more heaters are being used.
Example:
one of the following:
• a two-car garage door (16 feet wide open-
• a single-car garage door (9 feet wide
• two, 76 cm (30 inch) windows raised 31
A 150,000 Btu/Hr heater requires
ing) raised 9 cm (3 1/2 inches)
opening) raised 15.25 cm (6 inches)
cm (12 inches)
Screw
Hot Air
Outlet
Fuel Tank
Flange
Wheel
Support
Frame
Wheel
Cap Nut
Figure 3 - Wheel and Handle Assembly, 100/150,000 Btu/Hr Models Only
Nut
Axle
Extended
Hub
Rear
Handle
Air
Inlet
4
104976
OWNER’S MANUAL
THEORY OF
OPERATION
The Fuel System: The air pump forces
air through the air line. The air is then
pushed through the burner head nozzle. This
air causes fuel to lift from the tank. A fine
mist of fuel is sprayed into the combustion
chamber.
The Air System: The motor turns the fan.
The fan pushes air into and around the
combustion chamber. This air is heated and
provides a stream of clean, hot air.
The Ignition System: The electronic
ignitor sends voltage to the spark plug. The
spark plug ignites the fuel and air mixture.
The Flame-Out Control System: This
system causes the heater to shut down if the
flame goes out.
OPERATION
WARNING: Review and understand the warnings in the
Safety Information Section. They
are needed to safely operate this
heater. Follow all local codes
when using this heater.
TO START HEATER
1. Follow all ventilation and safety information.
2. Fill fuel tank with kerosene or No. 1
fuel oil.
3. Attach fuel cap.
4. Plug power cord of heater into standard
230 volt/50 hertz, grounded (earthed)
outlet. Use an extension cord if needed.
Use only a three-prong, grounded
(earthed) extension cord.
EXTENSION CORD WIRE
SIZE REQUIREMENTS
Up to 30.5 meters (100 feet) long, use 1.0
mm2 (16 AWG) conductor
30.6 to 61 meters (101 to 200 feet) long, use
1.5 mm2 (14 AWG) conductor
Push ON/OFF switch to ON and heater
should start. If heater does not start, press
flame-out control reset button (see Figures 5
and 6).
TO STOP HEATER
1. Push ON/OFF switch to OFF.
TO RESTART HEATER
1. Wait 2 minutes after stopping heater.
2. Repeat steps under To Start Heater.
Flame-Out Control
Reset Button
ON/OFF Switch
Combustion
Chamber
Clean
Heated
Air Out
Fuel
Tank
Figure 4 - Cross Section Operational View
Nozzle
Air For Fuel
System
Spark
Plug
Fuel
Filter
Burner
Head
Air Line
To Burner
Air For
Combustion
And Heating
Motor
Fan
Air Pump
Intake Air
Filter
Electronic
Ignitor
Fuel
Cool
Air In
Output
Air Filter
Figure 5 - Flame-Out Control Reset
Button, 35/50/70,000 Btu/Hr
Flame-Out Control
Reset Button
ON/OFF
Switch
Figure 6 - Flame-Out Control Reset
Button, 100/150,000 Btu/Hr
104976
5
PORTABLE FORCED AIR HEATERS
STORING,
TRANSPORTING,
OR SHIPPING
Note:
If shipping, transport companies re-
quire fuel tanks to be empty.
1. Drain fuel tank.
Note:
Some models have drain plug on
underside of fuel tank. If so, remove
drain plug to drain all fuel. If heater
does not have drain plug, drain fuel
through fuel cap opening. Be sure all
fuel is removed.
2. Replace drain plug if provided.
3. If any debris is noted in old fuel, add 1
or 2 quarts of clean kerosene to tank,
stir, and drain again. This will prevent
excess debris from clogging filters during future use.
4. Replace fuel cap or drain plug. Properly dispose of old and dirty fuel. Check
with local automotive service stations
that recycle oil.
5. If storing, store heater in dry place.
Make sure storage place is free of dust
and corrosive fumes.
IMPORTANT:
summer months for use during next heating
season. Using old fuel could damage heater.
Do not store kerosene over
PREVENT A TIVE
MAINTENANCE
SCHEDULE
Item
Fuel tank
Air output and
lint filters
Air intake filter
Fuel filter
Spark plug
Fan blades
Motor
How Often
Flush every 150-200 hours of
operation or as needed.
Replace every 500 hours of
operation or once a year.
Wash and dry with soap and
water every 500 hours of operation or as needed.
Clean twice a heating season
or as needed.
Clean and regap every 600
hours operation or replace as
needed.
Clean every season or as
needed.
Not required/permanently lubricated
WARNING: Never service heater
while it is plugged in, operating, or hot.
Severe burns and electrical shock can
occur.
How To
See Storing, Transporting, or Shipping.
See Air Output, Air Intake, and Lint
Filters, page 10.
See Air Output, Air Intake, and Lint
Filters, page 10.
See Fuel Filter, page 8.
See Spark Plug, page 9.
See Fan, page 13.
6
104976
OWNER’S MANUAL
TROUBLESHOOTING
OBSERVED FAULT
Heater ignites, but flame-out control shuts
off heater after a short period of time.
Heater will not ignite, but motor runs for a
short period of time.
WARNING: Never service heater while it is plugged in, operating, or
hot. Severe burns and electrical shock can occur.
POSSIBLE CAUSE
1. Wrong pump pressure
2. Dirty air output, air intake, and lint filters
3. Dirty fuel filter
4. Dirt in nozzle
5. Dirty photocell lens
6. Bad flame-out control
1. Wrong pump pressure
2. Carbon deposits on spark plug and/or
improper gap
3. Dirty fuel filter
4. Dirt in nozzle
5. Water in fuel tank
WARNING: High voltage!
REMEDY
1. See Pump Pressur e Adjustment, page 10.
2. See Air Output, Air Intake and Lint
Filters, page 10.
3. See Fuel Filter, page 8.
4. See Nozzle, page 11.
5. Clean photocell lens.
6. Replace flame-out control.
1. See Pump Pressur e Adjustment, page 10.
2. See Spark Plug, page 9.
3. See Fuel Filter, page 8.
4. See Nozzle, page 11.
5. Drain and flush fuel tank with clean
kerosene. See Storing, Transporting, or
Shipping, page 6.
Motor does not start when heater is plugged
in, fan rotates slowly or does not turn.
6. Electronic ignitor not grounded (earthed)
7. Bad electronic ignitor
1. Flame-out control not reset
2. Binding pump rotor
6. Make sure electronic ignitor mounting
is tight.
7. Replace electronic
ignitor.
1. Reset flame-out control button, see
Figures 5 and 6, page 5.
2. If fan is hard to turn, see Pump Rotor,
page 12.
104976
7
PORTABLE FORCED AIR HEATERS
SERVICE
PROCEDURES
WARNING: Never service
heater while it is plugged in, operating, or hot. Severe burns and
electrical shock can occur.
Upper Shell Removal
1. Remove screws and lock washers along
each side of heater using 5/16" nutdriver. These screws attach upper and
lower shells together.
2. Lift upper shell off.
3. Remove fan guard.
Fuel Filter
(35/50/70,000 Btu/Hr Models)
1. Remove side cover screws using 5/16"
nut-driver.
2. Remove side cover.
3. Pull rubber fuel line off fuel filter neck.
4. Carefully pry bushing and fuel filter out
of fuel tank.
5. W ash fuel filter with clean fuel and replace in tank.
6. Attach rubber fuel line to fuel filter
neck.
7. Replace side cover.
Fuel Filter
(100/150,000 Btu/Hr Models)
1. Remove side cover screws using 5/16"
nut-driver.
2. Remove side cover.
3. Pull upper fuel line off fuel filter neck.
4. Carefully pry bushing, lower fuel line,
and fuel filter out of fuel tank.
5. W ash fuel filter with clean fuel and replace in tank.
6. Attach upper fuel line to fuel filter neck.
7. Replace side cover.
Upper Shell
Fan
Guard
Figure 7 - Upper Shell Removal, 35/50/
70,000 Btu/Hr Models
Fuel Filter
Side Cover
Figure 9 - Fuel Filter Removal, 35/50/70,000 Btu/Hr Models
Fuel Filter, Bushing,
and Lower Fuel Line
Upper
Shell
Figure 8 - Upper Shell Removal, 100/
150,000 Btu/Hr Models
Fuel Line
Fan
Guard
Upper Fuel
Line
Side Cover
Figure 10 - Fuel Filter Removal, 100/150,000 Btu/Hr Models
8
104976
OWNER’S MANUAL
SERVICE
PROCEDURES
Continued
Spark Plug
(35,000 Btu/Hr Model)
1. Remove upper shell (see page 8).
2. Remove fan (see page 13).
3. Remove fuel and air line hoses from
nozzle assembly.
4. Remove spark plug wire from spark plug.
5. Remove two screws using 5/16" nutdriver and remove burner strap.
6. Place hex-body of spark plug into vise
and tighten.
7. Remove spark plug mounting nut using 11/16" open-end wrench.
8. Remove burner strap from spark plug.
9. Clean and regap spark plug electrodes
to 1.4 mm (.055") gap.
10. Replace burner strap onto spark plug.
Rotate burner strap to position spark
plug electrodes (see Figure 13).
11. Tighten spark plug with spark plug
mounting nut.
12. Release hex-body of spark plug from
vise.
13. Replace burner strap onto combustion
chamber.
14. Attach spark plug wire to spark plug.
15. Attach fuel and air line hoses to nozzle
assembly.
16. Replace fan (see page 13).
17. Replace fan guard and upper shell.
Spark Plug
Air Line
Hose
Burner
Strap
Mounting Nut
Burner Strap
Spark Plug
Spark
Plug
Wire
Nozzle
Assembly
Fuel Line
Hose
Bend Here
to Adjust
Gap
1.4 mm
(.055")
Gap
Combustion
Chamber
Figure 11 - Spark Plug Removal, 35,000
Btu/Hr Model
Figure 12 - Spark Plug Gap, 35,000 Btu/Hr
Model
Burner
Strap
Figure 13 - Spark Plug Rotation, 35,000
Btu/Hr Model Only
Spark Plug
(50/70/100/150,000 Btu/Hr Models)
1. Remove upper shell (see page 8).
2. Remove fan (see page 13).
3. Remove spark plug wire from spark plug.
4. Remove spark plug from burner head
using 13/16" open-end wrench.
5. Clean and regap spark plug electrodes
as follows:
50/70/100,000 Btu/Hr Models:
1.9 mm (.075") gap
150,000 Btu/Hr Model:
2.8 mm (0.110") gap
6. Install spark plug in burner head.
7. Attach spark plug wire to spark plug.
8. Replace fan (see page 13).
9. Replace fan guard and upper shell.
Burner
Head
Spark
Plug
Figure 14 - Spark Plug Removal, 50/70/
100/150,000 Btu/Hr Models
Figure 15 - Spark Plug Gap, 50/70/100/
150,000 Btu/Hr Models
Spark
Plug
Wire
Bend Here
to Adjust
Gap
Gap
104976
Continued
9
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 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 in filter end cover.
Do not oil filters
Air Intake Filter
Filter End
Cover
Lint Filter
Air Output
Filter
Figure 16 - 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 17 - Air Output, Air Intake, and Lint Filters, 100/150,000 Btu/Hr Models
Pressure
Gauge
Plug
Relief
Valve
Model (PSI/Bar)
35,000 Btu/Hr 2.9/0.200
50,000 Btu/Hr 4.9/0.338
70,000 Btu/Hr 5.2/0.359
100,000 Btu/Hr 3.9/0.269
150,000 Btu/Hr 4.8/0.331
Fan Guard
Fan Guard
Pump
Pressure
Figure 18 - Pressure Gauge Plug Removal
(35/50/70,000 Btu/Hr Models Shown)
10
Pressure
Gauge
Figure 19 - Adjusting Pump Pressure
104976
OWNER’S MANUAL
SERVICE
PROCEDURES
Continued
Nozzle
(35,000 Btu/Hr Model)
1. Remove upper shell (see page 8).
2. Remove fan (see page 13).
3. Remove fuel and air line hoses from
nozzle assembly.
4. Turn nozzle assembly 1/4 turn to left
and pull toward motor to remove.
5. Place plastic hex-body into vise and
lightly tighten.
6. Carefully remove nozzle from the
nozzle adapter using 5/8" socket
wrench.
7. Blow compressed air thru 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 (4.5-5.1 n-m/
40-45 inch-pounds).
10. Attach nozzle assembly to burner strap.
11. Attach fuel and airline hoses to nozzle
assembly.
12. Replace fan (see page 13).
13. Replace fan guard and upper shell.
Combustion
Chamber
Nozzle
Assembly
Fuel Line
Hose
Air Line
Hose
Figure 20 - Removing Air and Fuel Line
Hoses, 35,000 Btu/Hr Model
Burner
Strap
Nozzle
Assembly
Figure 21 - Removing Nozzle Assembly,
35,000 Btu/Hr Model
Nozzle
Face
Nozzle
Seal
Nozzle
Nozzle
Adapter
Air line
Fitting
Fuel line
Fitting
Figure 22 - Nozzle and Nozzle Adapter,
35,000 Btu/Hr Model
Nozzle
(50/70/100/150,000 Btu/Hr Models)
1. Remove upper shell (see page 8).
2. Remove fan (see page 13).
3. Remove fuel and air line hoses from
burner head.
4. Remove spark plug wire from spark
plug.
5. Remove spark plug from burner head
using 13/16" open-end wrench.
6. Remove three screws using 5/16" nutdriver and remove burner head from
combustion chamber.
7. Place burner head into vise and lightly
tighten.
8. Carefully remove nozzle from burner
head using 5/8" socket wrench (see Figure 24).
9. Blow compressed air thru face of nozzle.
This will free any dirt in nozzle area.
10. Inspect nozzle seal for damage.
11. Replace nozzle into burner head and
tighten firmly (9.1-12.4 n-m/80-110
inch-pounds).
12. Attach burner head to combustion
chamber.
13. Install spark plug in burner head.
14. Attach spark plug wire to spark plug.
15. Attach fuel and airline hoses to burner
head.
16. Replace fan (see page 13).
17. Replace fan guard and upper shell.
Combustion
Chamber
Screw
Air Line
Hose
Figure 23 - Removing Burner Head, 50/
70/100/150,000 Btu/Hr Models
Nozzle
Face
Nozzle
Seal
Nozzle
Burner
Head
Figure 24 - Removing Nozzle, 50/70/100/
150,000 Btu/Hr Models
Burner
Head
Spark Plug
Wire
Spark
Plug
Fuel Line
Hose
Fuel line
Fitting
Air line
Fitting
Continued
104976
11
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 27).
Note:
Rotate rotor one full turn to insure 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 28).
15. Reinstall insert and rotor.
16. Perform steps 10 through 12 above.
Blade
Pump
Plate
Insert
Rotor
Air Output
Filter
Figure 25 - Rotor Location, 35/50/70,000 Btu/Hr Models
Blade
Insert
Rotor
Air Output
Filter
Figure 26 - Rotor Location, 100/150,000 Btu/Hr Models
Gap Adjusting Screw
Blade
Air
Intake
Filter
Filter End
Cover
Pump
Plate
Air Intake Filter
.076/.101 mm (.003"/.004") Gap
Measured With Feeler Gauge
Fan Guard
Filter End
Cover
Fan Guard
Rotor
Gap Adjusting Screw
Figure 27 - Gap Adjusting Screw
Locations
12
Sandpaper
Figure 28 - Sanding Rotor
104976
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 30).
7. Place setscrew on flat of shaft. Tighten
setscrew firmly (40-50 inch-pounds/
4.5-5.6 n-m).
8. Replace fan guard and upper shell.
Setscrew
Remove fan from motor
Fan
SPECIFICATIONS
Output Rating (Btu/Hr) 35,000 50,000 70,000 100,000 150,000
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.) .26/1.0 .37/1.40 .49/1.85 .70/2.7 1.1/4.1
Electric Requirements 230 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 DIAGRAMS
Reset
Button
Flame-Out
Control
ON/Off Switch
Black
D
C
Terminal
Board
1a
1
Black
B
R
Red
Red
Red
Ignitor
Motor
Orange
Green-Yellow
Spark
Plug
Black
Motor
Shaft
Figure 29 - Fan, Motor Shaft, and Setscrew
Location
Fan
Flush
Motor
Shaft
Setscrew
Figure 30 - Fan Cross Section
104976
Blue
Photocell
Figure 31 - Wiring Diagram
13
White
B
A
WhiteWhite
White
RFI Filter
Brown
Blue
Green-Yellow
230 V~/50 Hz
PORTABLE FORCED AIR HEATERS
ILLUSTRATED
PARTS
BREAKDOWN
NTH35
35,000 BTU/HR MODEL
24
3
1
2
4
11-5
5
6
13
13
11
17
22
22
16
21
15
20
11-4
7
23
8
9
11-1
11-2
11-3
18
19
18-1
18-2
18-18
18-3
18-17
18-16
Motor and Pump Assembly
18-4
18-15
18-14
18-5
18-6
33
41
18-7
18-13
22
37
18-8
34
18-9
18-10
18-11
18-12
27
30
29
38
39
28
35
42
43
26
21
36
40
25
44
14
12
10
45
31
32
46
14
104976
OWNER’S MANUAL
PARTS LIST
NTH35
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 PART
NO. NUMBER DESCRIPTION QTY.
1 M51104-01 Handle 1
2 098511-231 Upper Shell 1
3 102432-01 Screw/Lockwasher, 1/2" 6
4 098512-43 Combustion Chamber 1
5 M51108-01 Heat Shield 1
6 M11084-29 Screw, #10-16 x 3/4" 2
7 M16660 Photocell Bracket 1
8 M10908-2 Screw, #6-32 x 3/8" 2
9 HA3019 Photocell Assembly 1
10 098872-03 Power Cord 1
11 ** Burner Strap Assembly 1
11-1 097124-01 Bracket 1
11-2 104183-01 Spark Plug 1
11-3 079980-01 Nozzle Adapter 1
11-4 M29824 Nut, 14mm 1
11-5 HA3006 Nozzle 1
12 102801-01 Power Line RFI Filter 1
13 M30865-02 Bushing 2
14 M50400 Strain Relief Bushing 1
15 M30884 Fan 1
16 M50631 Rubber Bumper 2
17 101205-01 Motor Bracket 1
18 ** Motor and Pump Assembly 1
18-1 102001-15 Motor (230V/50Hz) 1
18-2 079975-03 Pump Body 1
18-3 M22009 Insert 1
18-4 M22456-2 Rotor 1
18-5 M29608 End Pump Cover 1
18-6 M29632 Lint Filter 1
18-7 M29633 Intake Filter 1
18-8 M29609 End Filter Cover 1
18-9 M12461-31 Screw, #10-32 x 1" 3
18-10 M8940 Steel Ball (1/4" Dia.) 1
18-11 M10993-1 Pressure Relief Spring 1
18-12 M27694 Adjusting Screw 1
18-13 M22997 Plug 1
18-14 M29612-01 Output Filter 1
18-15 M12461-32 Screw, #10-32 x 1 1/8" 6
18-16 M50016 Elbow, 90˚ (Barb Fitting) 1
18-17 M8643-2 Blade 4
18-18 FHPF3-6C Screw, #10-32 x 3/4" 2
KEY PART PART
NO. NUMBER DESCRIPTION QTY.
19 M51105-01 Fan Guard 1
20 NTC-4C Hex locknut 2
21 M50104-02 Bushing (wires) 2
22 102431-01 Screw/Lockwasher, 1/2" 11
23 098511-232 Lower Shell 1
24 M11271-8 Clip Nut 6
25 RF3-6B Screw, #10-32 x 3/4" 1
26 M29652-04 Rubber Airline 1
27 M29652-05 Fuel Line 1
28 M16841-57 Wire Assembly (red) 1
29 M10990-3 Rubber Bushing 1
30 M50876-04 Fuel Filter Assembly 1
(Includes bushing)
31 102482-02 Electronic Ignitor 1
32 M11084-29 Screw, #10-16 x 3/4" 2
33 099125-13 Terminal Board 1
34 099157-01 Rivet 1
35 097630-02 Flame-Out Control 1
36 097702-01 Fuel Tank Cap 1
37 098513-89 Fuel Tank 1
38 097461-05AA Side Cover 1
39 NPF-3B Nut, #10-32 3
40 099177-01 Hex Nut 1
41 078918-01 Terminal Board Tab Cap 2
42 097785-01 Vinyl Foam Gasket 1
43 WLE-3 Lock Washer, #10 2
44 079010-33 Wire Assembly (black) 2
45 097462-01 ON/OFF Switch 1
46 079919-01 Switch Cover 1
PARTS AVAILABLE - NOT SHOWN
HA2210 Filler Neck Screen 1
104974-01 Tradename Decal 2
M9900-192 Combustion Chamber
Ground Wire 1
**Not available as an assembly, order parts separately.
104976
15
PORTABLE FORCED AIR HEATERS
1
2
4
3
5
6
7
8
10
11
12
12
14
15
17
20
18
19
21
21
24
28
29
30
31
32
34
38
37
11
13
9
33
35
36
42
43
39
40
23
44
11
41
45
26
25
16
22
27
ILLUSTRATED
PARTS
BREAKDOWN
NTH50
50,000 BTU/HR MODEL
Burner Head Assembly
18-18
18-15
10-1
10-2
10-3
10-6
Motor and Pump Assembly
18-19
18-1
18-3
18-17
18-16
10-4
18-2
10-5
18-4
18-14
10-7
18-5
18-6
18-7
18-13
18-8
16
18-9
18-10
18-11
18-12
104976
OWNER’S MANUAL
PARTS LIST
NTH50
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.
50,000 BTU/HR MODEL
KEY PART PART
NO. NUMBER DESCRIPTION QTY.
1 M51104-01 Handle 1
2 098511-231 Upper Shell 1
3 102432-01 Screw/Lockwasher, 1/2" 6
4 098512-55 Combustion Chamber 1
5 M11084-29 Screw, #10-16 x 3/4" 2
6 M16660 Photocell Bracket 1
7 M10908-2 Screw, #6-32 x 3/8" 2
8 HA3019 Photocell Assembly 1
9 098872-03 Power Cord 1
10 ** Burner Head Assembly 1
10-1 100735-16 Nozzle 1
10-2 M10659-1 Nozzle Seal Washer 2
10-3 M10809-1 Nozzle Seal Spring 1
10-4 M8882 Nozzle Seal Sleeve 1
10-5 M51098-02 Burner Head Body 1
10-6 M50820-01 Barb Fitting 2
10-7 104184-01 Spark Plug 1
11 102431-01 Screw/Lockwasher, 1/2" 12
12 M30865-02 Bushing 2
13 M50400 Strain Relief Bushing 1
14 M51107-01 Fan 1
15 M50631 Rubber Bumper 2
16 079010-33 Wire Assembly (black) 2
17 101205-01 Motor Bracket 1
18 ** Motor and Pump Assembly 1
18-1 102001-19 Motor (230V/50Hz) 1
18-2 079975-02 Pump Body 1
18-3 M22009 Insert 1
18-4 M22456-1 Rotor 1
18-5 M29608 End Pump Cover 1
18-6 M29632 Lint Filter 1
18-7 M29633 Intake Filter 1
18-8 M29609 End Filter Cover 1
18-9 M12461-31 Screw, #10-32 x 1" 3
18-10 M8940 Steel Ball (1/4" Dia.) 1
18-11 M10993-1 Pressure Relief Spring 1
18-12 M27694 Adjusting Screw 1
18-13 M22997 Plug 1
18-14 M29612-01 Output Filter 1
18-15 M12461-31 Screw, #10-32 x 1" 6
KEY PART PART
NO. NUMBER DESCRIPTION QTY.
18-16 M50016 Elbow, 90˚ (Barb Fitting) 1
18-17 M8643 Blade 4
18-18 FHPF3-5C Screw, #10-32 x 5/8" 2
18-19 104007-01 Capacitor 1
19 M51105-01 Fan Guard 1
20 NTC-4C Hex locknut 2
21 M50104-02 Bushing (wires) 2
22 102801-01 Power Line RFI Filter 1
23 098511-232 Lower Shell 1
24 M11271-8 Clip Nut 6
25 097462-01 ON/OFF Switch 1
26 079919-01 Switch Cover 1
27 RF3-6B Screw, #10-32 x 3/4" 1
28 M29652-04 Rubber Airline 1
29 079973-01 Fuel Line 1
30 M16841-57 Wire Assembly (red) 1
31 M10990-3 Rubber Bushing 1
32 M50876-05 Fuel Filter Assembly 1
(Includes bushing)
33 102482-02 Electronic Ignitor 1
34 M11084-29 Screw, #10-16 x 3/4" 2
35 099125-13 Terminal Board 1
36 099157-01 Rivet 1
37 097702-01 Fuel Tank Cap 1
38 097630-02 Flame-Out Control 1
39 098513-90 Fuel Tank 1
40 097461-05AA Side Cover 1
41 NPF-3B Nut, #10-32 3
42 099177-01 Hex Nut 1
43 078918-01 Terminal Board Tab Cap 2
44 097785-01 Vinyl Foam Gasket 1
45 WLE-3 Lock Washer, #10 2
PARTS AVAILABLE - NOT SHOWN
HA2210 Filler Neck Screen 1
104974-01 Tradename Decal 2
M9900-192 Combustion Chamber
Ground Wire 1
**Not available as an assembly, order parts separately.
104976
17
PORTABLE FORCED AIR HEATERS
ILLUSTRATED
PARTS
BREAKDOWN
NTH70
70,000 BTU/HR MODEL
Burner Head Assembly
10-1
10-2
10-4
10-3
10-6
18-19
10-5
10-7
24
35
43
3
1
45
28
44
2
14
18
19
20
21
11
27
33
22
4
5
12
12
32
29
31
10
11
17
30
15
21
41
38
39
7
6
23
8
36
18-1
18-2
18-18
18-3
18-17
18-16
18-15
18-14
Motor and Pump Assembly
18-4
18-5
18-6
18-7
18-13
40
11
18-8
18
18-9
18-10
18-11
18-12
37
42
16
13
34
9
25
26
104976
OWNER’S MANUAL
PARTS LIST
NTH70
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.
70,000 BTU/HR MODEL
KEY PART PART
NO. NUMBER DESCRIPTION QTY.
1 M51104-01 Handle 1
2 098511-231 Upper Shell 1
3 102432-01 Screw/Lockwasher, 1/2" 6
4 098512-44 Combustion Chamber 1
5 M11084-29 Screw, #10-16 x 3/4" 2
6 M16660 Photocell Bracket 1
7 M10908-2 Screw, #6-32 x 3/8" 2
8 HA3019 Photocell Assembly 1
9 098872-03 Power Cord 1
10 ** Burner Head Assembly 1
10-1 100735-14 Nozzle 1
10-2 M10659-1 Nozzle Seal Washer 2
10-3 M10809-1 Nozzle Seal Spring 1
10-4 M8882 Nozzle Seal Sleeve 1
10-5 M51098-02 Burner Head Body 1
10-6 M50820-01 Barb Fitting 2
10-7 104184-01 Spark Plug 1
11 102431-01 Screw/Lockwasher, 1/2" 12
12 M30865-02 Bushing 2
13 M50400 Strain Relief Bushing 1
14 M30884 Fan 1
15 M50631 Rubber Bumper 2
16 079010-33 Wire Assembly (black) 2
17 101205-01 Motor Bracket 1
18 ** Motor and Pump Assembly 1
18-1 102001-19 Motor with capacitor 1
18-2 079975-02 Pump Body 1
18-3 M22009 Insert 1
18-4 M22456-1 Rotor 1
18-5 M29608 End Pump Cover 1
18-6 M29632 Lint Filter 1
18-7 M29633 Intake Filter 1
18-8 M29609 End Filter Cover 1
18-9 M12461-31 Screw, #10-32 x 1" 3
18-10 M8940 Steel Ball (1/4" Dia.) 1
18-11 M10993-1 Pressure Relief Spring 1
18-12 M27694 Adjusting Screw 1
18-13 M22997 Plug 1
18-14 M29612-01 Output Filter 1
18-15 M12461-31 Screw, #10-32 x 1" 6
KEY PART PART
NO. NUMBER DESCRIPTION QTY.
18-16 M50016 Elbow, 90˚ (Barb Fitting) 1
18-17 M8643 Blade 4
18-18 FHPF3-5C Screw, #10-32 x 5/8" 2
18-19 104007-01 Capacitor 1
19 M51105-01 Fan Guard 1
20 NTC-4C Hex locknut 2
21 M50104-02 Bushing (wires) 2
22 102801-01 Power Line RFI Filter 1
23 098511-232 Lower Shell 1
24 M11271-8 Clip Nut 6
25 097462-01 ON/OFF Switch 1
26 079919-01 Switch Cover 1
27 RF3-6B Screw, #10-32 x 3/4" 1
28 M29652-04 Rubber Airline 1
29 079973-01 Fuel Line 1
30 M16841-57 Wire Assembly (red) 1
31 M10990-3 Rubber Bushing 1
32 M50876-05 Fuel Filter Assembly 1
(Includes bushing)
33 102482-02 Electronic Ignitor 1
34 M11084-29 Screw, #10-16 x 3/4" 2
35 099125-13 Terminal Board 1
36 099157-01 Rivet 1
37 097702-01 Fuel Tank Cap 1
38 097630-02 Flame-Out Control 1
39 098513-90 Fuel Tank 1
40 097461-05AA Side Cover 1
41 NPF-3B Nut, #10-32 3
42 099177-01 Hex Nut 1
43 078918-01 Terminal Board Tab Cap 2
44 097785-01 Vinyl Foam Gasket 1
45 WLE-3 Lock Washer, #10 2
PARTS AVAILABLE - NOT SHOWN
HA2210 Filler Neck Screen 1
104974-01 Tradename Decal 2
M9900-192 Combustion Chamber
Ground Wire 1
**Not available as an assembly, order parts separately.
104976
19
PORTABLE FORCED AIR HEATERS
1
2
3
4
5
7
8
9
10
11
12
13
14
15
17
20
25
26
9
30
31
33
34
35
36
37
38
39
40
41
6
42
9
21
22
23
24
43
44
27
28
16
19
18
47
46
45
29
32
ILLUSTRATED
PARTS
BREAKDOWN
NTH100
100,000 BTU/HR MODEL
8-1
8-6
8-2
8-4
8-3
Burner Head Assembly
13-19
13-1
13-2
13-18
13-17
13-16
13-15
Motor and Pump Assembly
13-3
13-4
13-5
13-14
8-7
8-5
13-6
13-13
13-7
13-8
13-12
13-9
13-10
13-11
20
104976
OWNER’S MANUAL
PARTS LIST
NTH100
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.
100,000 BTU/HR MODEL
KEY PART PART
NO. NUMBER DESCRIPTION QTY.
1 098511-233 Upper Shell 1
2 102432-01 Screw/Lockwasher, 1/2" 8
3 098512-31 Combustion Chamber 1
4 M16660 Photocell Bracket 1
5 HA3019 Photocell Assembly 1
6 M27417 Drain Plug 1
7 M10908-2 Screw, #6-32 x 3/8" 2
8 ** Burner Head Assembly 1
8-1 100735-15 Nozzle 1
8-2 M10659-1 Nozzle Seal Washer 2
8-3 M10809-1 Nozzle Seal Spring 1
8-4 M8882 Nozzle Seal Sleeve 1
8-5 M50924-03 Burner Head Body 1
8-6 M50820-02 Barb Fitting 2
8-7 104184-01 Spark Plug 1
9 102431-01 Screw/Lockwasher, 1/2" 13
10 M50814-06 Air Line 1
11 M51345-01 Fuel Line 1
12 102042-01 Fan 1
13 ** Motor and Pump Assembly 1
13-1 102001-03 Motor with capacitor 1
13-2 079975-02 Pump Body 1
13-3 FHPF3-5C Screw, #10-32 x 5/8" 2
13-4 M22009 Insert 1
13-5 M22456-1 Rotor 1
13-6 M50545 End Pump Cover 1
13-7 M12179 Intake Filter 1
13-8 M16545 End Filter Cover 1
13-9 M8940 Steel Ball (1/4" Dia.) 1
13-10 M10993-1 Pressure Relief Spring 1
13-11 M27694 Adjusting Screw 1
13-12 M22997 Plug 1
13-13 M12461-31 Screw, #10-32 x 1" 4
13-14 M12244-1 Output Filter 1
13-15 M12461-31 Screw, #10-32 x 1" 6
13-16 M11637 Lint Filter 1
13-17 M50820-02 Barb Fitting 1
13-18 M8643 Blade 4
13-19 103229-01 Capacitor 1
14 M51114-01 Fan Guard 1
15 M50631 Rubber Bumper 2
KEY PART PART
NO. NUMBER DESCRIPTION QTY.
16 097468-01 Edge Liner 1
17 101206-01 Motor Bracket 1
18 WLE-3 Lock Washer, #10 2
19 NPF-3B Nut, #10-32 3
20 NTC-4C Hex locknut 2
21 102482-02 Electronic Ignitor 1
22 M11084-29 Screw, #10-16 x 3/4" 2
23 099125-13 Terminal Board 1
24 099157-01 Rivet 1
25 M50104-03 Bushing 1
26 M50104-03 Bushing 1
27 M50104-01 Bushing 2
28 099213-01 Button Plug 1
29 102801-01 Power Line RFI Filter 1
30 098511-234 Lower Shell 1
31 M11271-8 Clip Nut 8
32 RF3-6B Screw, #10-32 x 3/4" 1
33 M51150-01 Fuel filter 1
34 M10990-3 Rubber Bushing 1
35 M51151-01 Fuel Line 1
36 098513-91 Fuel Tank 1
37 097702-01 Fuel Tank Cap 1
38 M16841-57 Wire Assembly (red) 1
39 097630-02 Flame-Out Control 1
40 M50400 Strain Relief Bushing 1
41 098872-03 Power Cord 1
42 M51077-01AA Side Cover 1
43 099177-01 Hex Nut 1
44 078918-01 Terminal Board Tab Cap 2
45 079010-34 Wire Assembly (black) 2
46 097462-01 ON/OFF Switch 1
47 079919-01 Switch Cover 1
PARTS AVAILABLE - NOT SHOWN
HA2210 Filler Neck Screen 1
104998-01 Tradename Decal 2
M9900-192 Combustion Chamber
Ground Wire 1
**Not available as an assembly, order parts separately.
104976
21
PORTABLE FORCED AIR HEATERS
ILLUSTRATED
PARTS
BREAKDOWN
NTH150
150,000 BTU/HR MODEL
8-1
8-2
8-4
8-3
8-6
Burner Head Assembly
8-8
8-5
8-7
2
1
3
4
5
23
31
44
30
8
7
9
15
36
24
10
33
34
35
37
26
25
11
17
43
28
18
19
27
12
20
13
14
21
9
22
32
13-19
13-1
13-2
13-18
13-17
13-16
13-15
13-3
Motor and Pump Assembly
13-4
13-5
13-14
13-6
13-13
42
16
13-7
38
39
9
6
13-8
13-9
13-10
13-11
13-12
22
45
46
29
40
41
47
104976
48
OWNER’S MANUAL
PARTS LIST
NTH150
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.
150,000 BTU/HR MODEL
KEY PART PART
NO. NUMBER DESCRIPTION QTY.
1 098511-233 Upper Shell 1
2 102432-01 Screw/Lockwasher, 1/2" 8
3 098512-36 Combustion Chamber 1
4 099229-01 Photocell Bracket 1
5 HA3019 Photocell Assembly 1
6 M27417 Drain Plug 1
7 M10908-2 Screw, #6-32 x 3/8" 2
8 ** Burner Head Assembly 1
8-1 100735-11 Nozzle 1
8-2 M10659-1 Nozzle Seal Washer 2
8-3 M10809-1 Nozzle Seal Spring 1
8-4 M8882 Nozzle Seal Sleeve 1
8-5 M50924-08 Burner Head Body 1
8-6 M50820-02 Barb Fitting 2
8-7 104184-01 Spark Plug 1
8-8 103409-01 Wave Spring Washer 1
9 102431-01 Screw/Lockwasher, 1/2" 13
10 M50814-06 Air Line 1
11 M51345-01 Fuel Line 1
12 102042-01 Fan 1
13 ** Motor and Pump Assembly 1
13-1 102001-03 Motor with capacitor 1
13-2 079975-03 Pump Body 1
13-3 FHPF3-6C Screw, #10-32 x 3/4" 2
13-4 M22009 Insert 1
13-5 M22456-2 Rotor 1
13-6 M50545 End Pump Cover 1
13-7 M12179 Intake Filter 1
13-8 M16545 End Filter Cover 1
13-9 M8940 Steel Ball (1/4" Dia.) 1
13-10 M10993-1 Pressure Relief Spring 1
13-11 M27694 Adjusting Screw 1
13-12 M22997 Plug 1
13-13 M12461-31 Screw, #10-32 x 1" 4
13-14 M12244-1 Output Filter 1
13-15 M12461-32 Screw, #10-32 x 1 1/8" 6
13-16 M11637 Lint Filter 1
13-17 M50820-02 Barb Fitting 1
13-18 M8643-2 Blade 4
13-19 103229-01 Capacitor 1
14 M51114-01 Fan Guard 1
KEY PART PART
NO. NUMBER DESCRIPTION QTY.
15 M50631 Rubber Bumper 2
16 097468-01 Edge Liner 1
17 101206-01 Motor Bracket 1
18 WLE-3 Lock Washer, #10 2
19 NPF-3B Nut, #10-32 3
20 NTC-4C Hex locknut 2
21 102482-02 Electronic Ignitor 1
22 M11084-29 Screw, #10-16 x 3/4" 2
23 099125-13 Terminal Board 1
24 099157-01 Rivet 1
25 M50104-03 Bushing 1
26 M50104-03 Bushing 1
27 M50104-01 Bushing 2
28 099213-01 Button Plug 1
29 102801-01 Power Line RFI Filter 1
30 098511-234 Lower Shell 1
31 M11271-8 Clip Nut 8
32 RF3-6B Screw, #10-32 x 3/4" 1
33 M51150-01 Fuel filter 1
34 M10990-3 Rubber Bushing 1
35 M51151-02 Fuel Line 1
36 098513-92 Fuel Tank 1
37 097702-01 Fuel Tank Cap 1
38 M16841-57 Wire Assembly (red) 1
39 097630-02 Flame-Out Control 1
40 M50400 Strain Relief Bushing 1
41 098872-03 Power Cord 1
42 M51077-01AA Side Cover 1
43 097785-04 Vinyl Foam Gasket 2
44 078918-01 Terminal Board Tab Cap 2
45 099177-01 Hex Nut 1
46 079010-34 Wire Assembly (black) 2
47 097462-01 ON/OFF Switch 1
48 079919-01 Switch Cover 1
PARTS AVAILABLE - NOT SHOWN
HA2210 Filler Neck Screen 1
104998-01 Tradename Decal 2
M9900-192 Combustion Chamber
Ground Wire 1
**Not available as an assembly, order parts separately.
104976
23
PORTABLE FORCED AIR HEATERS
WHEELS AND
HANDLES
100,000 AND 150,000 BTU/HR
MODELS
KEY PART PART 100,000 150,000
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 097896-03 Wheel 2 2
6 M28526 Cap Nut 2 2
7 M51015-01 Axle 1 —
M16801-2 Axle — 1
1
ACCESSORIES
Purchase accessories from your local dealer.
AIR GAUGE KIT - HA1180
For all models. Special tool to check pump
pressure.
2
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.
3
5
4
STANDARD WHEELS AND
7
6
HANDLE KIT - HA1206
Makes heater even more portable and convenient. Easy to assemble. For 35/50/70,000
Btu/Hr models.
24
104976
EC CONFORMITY
DECLARATION
Model Numbers: NTH35, NTH50, NTH70, NTH100, NTH150
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 89/392/EEC,
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 Douglas D. Rohrer
Title Vice President, Specialty Products Engineering
03/15/97 — Bowling Green, KY
Date and Place Signature
104976
25
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.
Printed in U.S.A.
104976-01
REV. A
08/98
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