Desa D30N, D44N, D20N User Manual
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
Loading...