PORTABLE
FORCED
AIR HEATERS
OWNER’S MANUAL
Models: D20N, D30N, and D44N
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.
D20N, D30N AND D44N MODELS
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 v apors
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
105843
OWNER’S MANUAL
PRODUCT
IDENTIFICATION
Hot Air Outlet
Upper Shell
Lower Shell
Fuel Tank
Side Cover
ON/OFF Switch
with Light
Figure 1 - D20N Model
Hot Air Outlet
Upper Shell
Fan Guard
Air Filter
End Cover
Power
Cord
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 - D30N and D44N Models
105843
Fan Guard
Fuel Tank
Power Cord
ON/OFF Switch
with Light
3
D20N, D30N AND D44N MODELS
PORTABLE FORCED AIR HEATERS
ASSEMBLY
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).
2. Place cap nuts on axle ends. Gently tap
with hammer to secure.
3. Place heater on wheel support frame.
For D20N model, make sure outlet end
(front) of heater is over wheels. For
D30N and D44N models, 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. For D20N model, place rear handle on
top of fuel tank flange. For D30N and
D44N models, place front handle and
rear handle on top of fuel tank flange.
Insert screws through handle(s), 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.
When installing wheels,
Hot Air
Outlet
Fuel
Tank
Flange
Wheel
Support
Frame
Wheel
D20N Model
Cap Nut
Screw
Nut
Sleeve Cap Screw
Hot Air
Outlet
Fuel
Tank
Flange
Axle
Wheel
Front
Handle
Nut
Rear
Handle
Air
Inlet
D30N and D44N Models
Handle
Air
Inlet
Extended
Hub
Wheel Support
Frame
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.
Axle
Cap Nut
Figure 3 - Wheel and Handle Assembly
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:
A 150,000 Btu/Hr heater requires
one of the following:
• a two-car garage door [4.9 m (16 ft.) opening] raised 9 cm (3.5 inches)
4
Extended
Hub
• a single-car garage door [2.75 m (9 ft.)
opening] raised 15.25 cm (6 inches)
• two, 76 cm (30 inch) windows raised 28
cm (11 inches)
105843
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 infor mation.
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.
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
2
mm
(16 AWG) conductor
30.6 to 61 meters (101 to 200 feet) long, use
1.5 mm2 (14 AWG) conductor
Push ON/OFF switch to ON (|) position and
heater should start in 5 seconds. If ON/OFF
switch light does not come on or heater does
not start, see Troubleshooting (pages 6 and 7).
TO STOP HEATER
1. 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
O
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, D20N Model
|
ON/OFF Switch
O
with Light
Figure 6 - ON/OFF Switch, D30N and
D44N Models
105843
5
D20N, D30N AND D44N MODELS
PORTABLE FORCED AIR HEATERS
STORING,
TRANSPORTING,
OR SHIPPING
Note:
If shipping, transport companies re-
quire fuel tanks to be empty.
1. Drain fuel tank.
Note:
Some models have drain plug on
underside of fuel tank. If so, remove
drain plug to drain all fuel. If heater
does not have drain plug, drain fuel
through fuel cap opening. Be sure all
fuel is removed.
2. Replace drain plug if provided.
3. If any debris is noted in old fuel, add 1
or 2 quarts of clean kerosene to tank,
stir, and drain again. This will prevent
excess debris from clogging filters during future use.
4. Replace fuel cap or drain plug. Properly dispose of old and dirty fuel. Check
with local automotive service stations
that recycle oil.
5. If storing, store heater in dry place.
Make sure storage place is free of dust
and corrosive fumes.
IMPORTANT:
summer months for use during next heating
season. Using old fuel could damage heater.
Do not store kerosene over
PREVENTATIVE
MAINTENANCE
SCHEDULE
Item
Fuel tank
Air output and
lint filters
Air intake filter
Fuel filter
Ignitor
Fan blades
Motor
How Often
Flush every 150-200 hours of
operation or as needed
Replace every 500 hours of
operation or once a year
Wash and dry with soap and
water every 500 hours of operation or as needed
Clean twice a heating season
or as needed
No maintenance required
Clean every season or as
needed
Not required/permanently lu-
bricated
WARNING: Never service heater
while it is plugged in, operating, or hot.
Severe burns and electrical shock can
occur.
How To
See Storing, Transporting, or Ship-
ping
See Air Output, Air Intake, and Lint
Filters, page 10
See Air Output, Air Intake, and Lint
Filters, page 10
See Fuel Filter, page 8
See Fan, page 13
TROUBLESHOOTING
FAULT CONDITION
Motor does not start five seconds after heater
is plugged in (ON/OFF switch light remains
on)
WARNING: Never service heater while it is plugged in, operating, or
hot. Severe burns and electrical shock can occur.
ATTENTION:
the light in the ON/OFF switch to troubleshoot the fault condition.
POSSIBLE CAUSE
1. Bad electrical connection between motor
and ignition control assembly or ignition
control assembly and power cord
2. Blown fuse on ignition control assembly
3. Binding pump rotor
4. Defective ignition control assembly
5. Defective motor
The ignition control has built-in protection against current overloads. Use
REMEDY
1. Check all electrical connections. See
Wiring Diagram, page 21
WARNING: High voltage!
2. See Ignition Control Assembly, page 13
3. If fan does not turn freely, see Pump
Rotor, page 12
4. Replace ignition control assembly
5. Replace motor
6
105843
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, T ransporting , or
Shipping, page 6
6. Check electrical connections. See Wiring
Diagram, page 21
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(I) position
and heater does not start
ON/OFF switch light comes on when switch
is turned to the ON(I) 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 21
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 21
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
105843
7
D20N, D30N AND D44N MODELS
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
(D20N Model)
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
(D30N and D44N 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, D20N
Model
Fuel Filter
Side Cover
Fuel Line
Figure 9 - Fuel Filter Removal, D20N Model
Fuel Filter, Bushing,
and Lower Fuel Line
Upper
Shell
Fan
Guard
Figure 8 - Upper Shell Removal, D30N
and D44N Models
Upper Fuel
Line
Side Cover
Figure 10 - Fuel Filter Removal, D30N and D44N Models
8
105843
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 (gray) 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).
Torque 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 Figures 17, 18, and 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
105843
Continued
9
D20N, D30N AND D44N MODELS
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 13 - Air Output, Air Intake, and Lint Filters, D20N Model
Air Intake Filter
Filter End
Cover
Lint Filter
Air Output
Filter
Figure 14 - Air Output, Air Intake, and Lint Filters, D30N and D44N Models
Pressure
Gauge
Plug
Relief
Valve
Model (PSI/Bar)
D20N 4.7/0.324
D30N 4.9/0.338
D44N 5.5/0.380
Fan Guard
Fan Guard
Pump
Pressure
Figure 15 - Pressure Gauge Plug Removal
(D20N Model Shown)
10
Pressure
Gauge
Figure 16 - Adjusting Pump Pressure
105843
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 (40-45 inchpounds). 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
Burner
Strap
Air Line
Hose
Nozzle/
Adapter
Assembly
Fuel Line
Photocell Bracket
Figure 18 - Removing Air and Fuel Line
Hoses (D30N Model Only)
Combustion
Chamber
Burner
Strap
Photocell
Bracket
Air Line
Hose
Figure 19 - Removing Air and Fuel Line
Hoses (D44N Model Only)
Combustion
Chamber
Hose
Nozzle/
Adapter
Assembly
Fuel Line
Hose
Nozzle/
Adapter
Assembly
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).
Route air and fuel line approximately
as shown. For D20N model heater , see
Figure 17. For D30N model heat er, see
Figure 18. For D44N model heater, see
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
Burner
Strap
Photocell
Bracket
Air Line
Hose
Figure 17 - Removing Air and Fuel Line
Hoses (D20N Model Only)
105843
Nozzle/
Adapter
Assembly
Fuel Line
Hose
Figure 20 - Removing Nozzle/Adapter
Assembly
Nozzle Face
Nozzle
Seal
Nozzle
Nozzle
Adapter
Air Line
Fitting
Figure 21 - Nozzle and Nozzle Adapter
Fuel Line Fitting
11
Barb Fitting
Air Hose
Figure 22 - Air Hose to Barb FItting
Continued
Continued
D20N, D30N AND D44N MODELS
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, D20N Model
Insert
Figure 24 - Rotor Location, D30N and D44N 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
Pump
Plate
Filter End
Cover
Fan Guard
Air Intake Filter
Filter End
Cover
Fan Guard
Rotor
Gap Adjusting
Screw
Figure 25 - Gap Adjusting Screw Locations
12
Sandpaper
Figure 26 - Sanding Rotor
105843
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. T ighten
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
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 21.
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
105843
Side Cover
Ignition
Control
Assembly
Figure 30 - Removing Circuit Board
Printed Circuit
Board Supports (5)
13
4. Using the 5/16" nut driver or socket
wrench reinstall side cover to heater.
Tighten screws until snug. Do not o ver
torque!
Unacceptable Acceptable
Unacceptable Acceptable
Figure 31 - Attaching Circuit Board to
Tabs
D20N, D30N AND D44N MODELS
PORTABLE FORCED AIR HEATERS
ILLUSTRATED
PARTS
BREAKDOWN
D20N MODEL
4
2
5
9-1
9-2
9-6
9-5
9
7
8
22
6
21
26
10
18
20
23
11
9-4
9-3
12
13
16
24
12-1
12-2
12-18
12-17
12-16
Motor and Pump Assembly
12-3
12-15
12-4
12-14
17
12-5
19
12-6
35
12-7
12-12
28
30
29
32
33
37
39
27
38
31
25
34
15
14
36
1
40
3
12-8
12-9
12-13
12-10
12-19
12-11
14
105843
OWNER’S MANUAL
PARTS LIST
D20N MODEL
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 105793-01 ON/OFF Switch 1
2 098511-264 Upper Shell 1
3 079919-01 Switch Cover 1
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 100735-25 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 (230V/50 Hz) 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
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 PART
NO. NUMBER DESCRIPTION QTY.
12-19 105780-01 Plastic Cap 1
13 M51105-01 Fan Guard 1
14 079673-07 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 097461-03AA 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 RF3-5B Screw, #10-32 x 5/8" 1
26 098511-235 Lower Shell 1
27 M50814-06 Rubber Airline 1
28 M29652-05 Fuel Line 1
29 M50876-05 Fuel Filter with bushing 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 098513-102 Fuel Tank 1
36 079010-40 Wire Assembly (White) 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) 1
PARTS AVAILABLE - NOT SHOWN
HA2210 Filler Neck Screen 1
103814-01 Wire Tie 1
103238-01 Tradename Decal 2
105852-01 Decal Package 1
*** Not available as an assembly; order parts separately
105843
15
D20N, D30N AND D44N MODELS
PORTABLE FORCED AIR HEATERS
ILLUSTRATED
PARTS
BREAKDOWN
D30N MODEL
2
1
3
7-4
7
4
6
24
28
5
8
11
23
20
22
21
30
19
25
18
42
9
10
12
15
26
27
41
7-1
7-2
7-6
7-3
7-5
16
29
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
35
10-6
31
43
14
36
32
17
37
13
33
34
44
39
38
14
40
10-7
10-8
10-9
10-10
10-11
10-12
16
105843
OWNER’S MANUAL
PARTS LIST
D30N MODEL
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 098511-138 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 100735-23 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
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 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 M51345-06 Fuel Line 1
20 099743-01 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 2
26 M50104-01 Bushing 1
27 102431-01 Screw/Lockwasher, 1/2" 6
28 M11271-8 Clip Nut 8
29 RF3-5B Screw, #10-32 x 5/8" 1
30 098513-91 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 079673-07 Power Cord 1
35 M51077-09AA Side Cover 1
36 102431-01 Screw/Lockwasher, 1/2" 4
37 102861-01 Nylon Locknut 1
38 079010-39 Wire Assembly (Brown) 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
103238-01 Tradename Decal 2
105852-02 Decal Package 1
*** Not available as an assembly; order parts separately
105843
17
D20N, D30N AND D44N MODELS
PORTABLE FORCED AIR HEATERS
ILLUSTRATED
PARTS
BREAKDOWN
D44N MODEL
2
1
3
7-4
7
4
6
24
28
5
8
11
23
20
22
21
30
19
25
18
42
9
10
12
15
26
27
41
7-1
7-2
7-6
7-3
7-5
16
29
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
35
10-6
31
43
14
36
32
17
37
13
33
34
44
39
38
14
40
10-7
10-8
10-9
10-10
10-11
10-12
18
105843
OWNER’S MANUAL
PARTS LIST
D44N Model
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 098511-138 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
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.
1
/8"6
KEY PART
NO. NUMBER DESCRIPTION QTY.
14 104068-04 Ignition Control Assembly 1
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 M51345-06 Fuel Line 1
20 099743-01 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 2
26 M50104-01 Bushing 1
27 102431-01 Screw/Lockwasher, 1/2" 6
28 M11271-8 Clip Nut 8
29 RF3-5B Screw, #10-32 x 5/8" 1
30 098513-92 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 079673-07 Power Cord 1
35 M51077-09AA Side Cover 1
36 102431-01 Screw/Lockwasher, 1/2" 4
37 102861-01 Nylon Locknut 1
38 079010-39 Wire Assembly (Brown) 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
103238-02 Tradename Decal 2
105852-03 Decal Package 1
*** Not available as an assembly; order parts separately
105843
19
D20N, D30N AND D44N MODELS
PORTABLE FORCED AIR HEATERS
WHEELS AND HANDLES
2
8
1
D30N and
D44N
Models
D20N Model
7
5
6
4
3
KEY PART PART D20N D30N D44N
NO. NUMBER DESCRIPTION QTY. QTY. QTY.
3
5
6
2
4
1
7
1 HA2203 Handles — 2 —
HA2204 Handles —— 2
097198-02 Handles 1 ——
2 M12345-33 Screw, #10-24 x 1 3/4"48 8
3 M12342-3 Wheel Support Frame — 1 —
M12831-3 Wheel Support Frame —— 1
097197-02 Wheel Support Frame 1 ——
4 NTC-3C Hex Nut, #10-24 4 8 8
5 107426-01 Wheel (Qty 2) 1 1 1
6 M28526 Cap Nut 2 2 2
7 M51015-01 Axle — 1 —
M16801-2 Axle —— 1
M51015-04 Axle 1 ——
8 078978-02 Sleeve Cap 2 ——
20
105843
OWNER’S MANUAL
A 008
SPECIFICATIONS
Output Rating (Btu/Hr) 70,000 110,000 150,000
Fuel Use Only Kerosene or No. 1 Fuel Oil
Fuel Tank Capacity
(U.S. Gal./Liters) 5.0/18.9 9.0/34 13.5/51.1
Fuel Consumption
(Gal. Per Hr./Liters Per Hr.) .52/1.97 .79/3.0 1.1/4.1
Electric Requirements 230 V/50 Hz (Same All Models)
Amperage (Normal Run) 1.0 1.2 1.2
Hot Air Output (CFM/CMM) 225/6.4 425/12 500/14.2
RPM 2850 2850 2850
WIRING DIAGRAM
Photocell (1)
Photocell (2)
Motor Return (3)
230V Lamp (4)
AC Neutral (N)
Ignition Control
AC Hot (5)
Motor Main (6)
Ignitor (7)
Ignitor Return (8)
Blue
Blue
White
White
Blue
Brown
Red
Black
Black
Motor
Ignitor
Photocell
GreenYellow
Blue
GreenYellow
1
1a
2
On/Off
Switch
Power Plug
230V/50Hz
Brown
ACCESSORIES
Purchase accessories from your local dealer.
AIR GAUGE KIT - HA1180
For all models. Special tool to check pump
pressure.
IGNITION CONTROL
ASSEMBLY/PHOTOCELL
TESTER - HA1170
Special tool used to test the ignition control
assembly and photocell.
105843
21
D20N, D30N AND D44N MODELS
PORTABLE FORCED AIR HEATERS
EC CONFORMITY DECLARATION
EC CONFORMITY DECLARATION
DESA Europe B.V.
Innsbruckweg 144, 3047 AH
Postbus 11158
3004 ED Rotterdam
Holland
Manufacturer:
DESA International, Inc.
2701 Industrial Drive
Bowling Green, KY 42101 U.S.A.
Kerosene Portable Forced Air Heaters
Model Numbers: D20N, D30N, and D44N
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 Joseph B. Lee
Title Vice President, Heating Products Engineering
07/25/2000 — Bowling Green, KY
Date and Place Signature
22
105843
OWNER’S MANUAL
NOTES
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105843
23
WARRANTY INFORMATION
CERTIFICATE OF GENERAL
EQUIPMENT - LIMITED ONE YEAR WARRANTY
DESA International 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:
DESA International's obligation and liability under this
Warranty is expressly limited to repairing or replacing at DESA
International's option, any parts which appear to DESA International 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
DESA International 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. DESA INTERNATIONAL MAKES NO
OTHER EXPRESS WARRANTY. TO THE EXTENT PERMITTED BY LAW DESA INTERNATIONAL MAKES NO IMPLIED
WARRANTY AND MAKES NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PUR-
WARRANTY SERVICE
POSE. IN ANY EVENT IMPLIED 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. DESA International's obligation under this limited Warranty shall not include any liability for direct, indirect, incidental,
or consequential damage or delay. If requested by DESA
International, 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 DESA International, or any
alteration or repair by others in such manner as in DESA
International'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 DESA
INTERNATIONAL AT ITS HOME OFFICE.
Printed in U.S.A.
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.
A Service Manual is available by writing to the Technical Service
Department at:
INTERNATIONAL
Corporate Headquarters
2701 Industrial Drive
P.O. Box 90004
Bowling Green, Kentucky 42102-9004
U.S.A.
105843 01
NOT A UPC
105843-01
Rev. B
08/00
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