Desa PORTABLE FORCED AIR HEATERS User Manual
PORTABLE
FORCED
AIR HEATERS
OWNER’S MANUAL
Heater Sizes: 20,5 kW (70,000 Btu/Hr)
29,3 kW (100,000 Btu/Hr)
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.
70,000 AND 100,000 BTU/HR
PORTABLE FORCED AIR HEATER
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, 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.
• Minimum heater clearances from combustibles:
Outlet: 250 cm (8 Ft.)
Sides, Top, and Rear: 125 cm (8 Ft.)
• Locate heater on a stable and level surface while 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. Using duct w ork could reduce the
necessary air flow of heater . Heater would
produce excessive carbon monoxide.
• 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.
• Never use heater where gasoline, paint
thinner, or other highly flammable v apors
are present.
• Follow all local ordinances and codes
when using heater.
• Use only in well-vented areas. Provide
at least a three-square foot (2800 square
cm) opening of fresh, outside air for each
29,3 kW (100,000 Btu/Hr) of rating.
• Use only in places free of flammable vapors or high dust content.
• Use only with the electrical voltage and
frequency specified on model plate.
• Use only a grounded (earthed) extension
cord.
2
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OWNER’S MANUAL
PRODUCT
IDENTIFICATION
Hot Air Outlet
Upper Shell
Lower Shell
Fuel Tank
Side Cover
Figure 1 - 20,5 kW (70,000 Btu/Hr) Model
Handle
Fan Guard
Fuel Cap
Air Filter
End Cover
Power Cord
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.
On/Off
Switch
Fuse
Hot Air
Outlet
Lower
Shell
Fuel Cap
Side Cover
Figure 2 - 29,3 kW (100,000 Btu/Hr) Model
Upper Shell
Fan Guard
On/Off
Switch
Fuse
Power Cord
Fuel Tank
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3
70,000 AND 100,000 BTU/HR
PORTABLE FORCED AIR HEATER
ASSEMBLY
(For 20,5 kW [70,000 Btu/Hr] Model
Only)
GROMMET AND FUEL CAP
Within the plastic bag are the following:
• Fuel Cap (1)
• Cushion Grommet (3)
1. Install fuel cap on fuel tank.
2. Install three cushion grommets in holes
on bottom of fuel tank. Install two
grommets on one foot and one grommet on opposite foot (see Figure 3).
(For 29,3 kW [100,000 Btu/Hr] Model
Only)
This model is 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 4).
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.
When installing wheels,
Grommet
Grommet
Figure 3 - Installing Grommets, 20,5 kW (70,000 Btu/Hr Model) Only
Front
Handle
Screw
Hot Air
Outlet
Rear
Handle
Fuel Tank
Flange
Wheel
Support
Frame
Wheel
Cap Nut
Figure 4 - Wheel and Handle Assembly, 29,3 kW (100,000 Btu/Hr Model) Only
Nut
Extended Hub
Axle
Air
Inlet
4
104252
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 transformer
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.
FUELS
Combustion
Chamber
Clean
Heated
Air Out
Fuel
Tank
Figure 5 - Cross Section Operational View
Nozzle
Air For Fuel
System
Fuel Filter
VENTILATION
Spark
Plug
Burner
Head
Air For Combustion
And Heating
Motor Air Pump
Fan
Air line
To Burner
Intake
Air
Filter
Cool
Air
In
Output
Air
Filter
Transformer
Fuel
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
• poor starting during very cold weather
IMPORTANT:
Use a KEROSENE ONLY
container. Be sure storage container is clean.
Foreign matter such as rust, dirt, or water
will cause the flame-out control to shut
down heater. Foreign matter may also require you to clean fuel system often.
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 29,3
kW (100,000 Btu/Hr) rating. Provide extra
fresh air if more heaters are being used.
Example:
A 29,3 kW (100,000 Btu/Hr)
heater requires one of the following:
• a 4,88 m (16 foot) wide two-car garage
door raised 5,72 cm (2.25 inches)
• a 2,75 m (9 foot) wide single-car garage
door raised 10,16 cm (4 inches)
• two, 76,20 cm (thirty-inch) wide windows raised 18,42 cm (7.25 inches)
104252
5
70,000 AND 100,000 BTU/HR
PORTABLE FORCED AIR HEATER
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 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 grounded (earthed) extension cord.
Extension Cord Wire Size Requirements
Up to 100 feet (30.5 meters) long, use
16 AWG (1.0 mm2) conductor
101 to 200 feet (30.6 to 61 meters) long,
use 14 AWG (1.5 mm2) conductor
5. Switch heater on.
To Stop Heater
1. Switch heater off. Unplug power cord
from outlet.
To Restart Heater
1. Wait 2 minutes after stopping heater.
2. Repeat steps under To Start Heater.
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
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
Clean twice a heating season or as needed.
Clean and regap every 300 hours operation or replace
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.
operation or as needed.
as needed.
How To
See Storing , Tr ansporting, or Shipping, above.
See Air Output, Air Intake, and Lint Filters,
page 9.
See Air Output, Air Intake, and Lint Filters,
page 9.
See Fuel Filter, page 8.
See Spark Plug, page 8.
See Fan, page 12.
6
104252
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. Congealed fuel
2. Wrong pump pressure
3. Carbon deposits on spark plug and/or
improper gap
4. Dirty fuel filter
5. Dirt in nozzle
6. Water in fuel tank
WARNING: High voltage!
REMEDY
1. See Pump Pr essure Adjustment, page 9.
2. See Air Output, Air Intake and Lint F il-
ters, page 9.
3. See Fuel Filter, page 8.
4. See Nozzle, page 10.
5. Clean photocell lens.
6. Replace flame-out control.
1. Temporarily move unplugged heater to
a warmer, ventilated location.
2. See Pump Pr essure Adjustment, page 9.
3. See Spark Plug, page 8.
4. See Fuel Filter, page 8.
5. See Nozzle, page 10.
6. 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.
7. Transformer not grounded (earthed)
8. Bad transformer
1. Binding pump rotor
7. Make sure transformer mounting is tight.
8. Replace transformer.
1. If fan is hard to turn, see Pump Rotor,
page 11.
104252
7
70,000 AND 100,000 BTU/HR
PORTABLE FORCED AIR HEATER
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 along each side of
heater using 5/16" nut-driver. These
screws attach upper and lower shells
together.
2. Lift upper shell off.
3. Remove fan guard.
Fuel Filter
1. Remove drain plug to access the fuel
filter.
2. Remove fuel filter with needle nose
pliers.
3. W ash fuel filter with clean fuel and replace on pick-up tube.
4. Replace drain plug.
Upper
Shell
Figure 6 - Upper Shell Removal,
20,5 kW (70,000 Btu/Hr) Model
Fuel Filter
Upper
Shell
Fan
Guard
Fan
Guard
Figure 7 - Upper Shell Removal,
29,3 kW (100,000 Btu/Hr) Model
Pick-up
Tube
Spark Plug
1. Remove upper shell (see above).
2. Remove fan (see page 12).
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
to .055" (1.4 mm) gap.
6. Install spark plug in burner head.
7. Attach spark plug wire to spark plug.
8. Replace fan (see page 12).
9. Replace fan guard and upper shell.
Drain Plug
Figure 8 - Fuel Filter Removal
Burner
Head
Figure 9 - Spark Plug Removal
Figure 10 - Spark Plug Gap
Spark Plug Wire/Boot
Spark Plug
Bend Here to
Adjust Gap
.055"
(1.4 mm)
Gap
8
104252
OWNER’S MANUAL
SERVICE
PROCEDURES
Continued
Air Output, Air Intake, and Lint
Filters
1. Remove upper shell (see page 8).
2. Remove filter end cover screws using
5/16" nut-driver.
3. Remove filter end cover.
4. Replace air output and lint filters.
5. Wash or replace air intake filter (see
Preventative Maintenance Schedule,
page 6).
6. Replace filter end cover.
7. Replace fan guard and upper shell.
IMPORTANT:
Do not oil filters
Air Intake Filter
Filter End
Cover
Lint Filter
Air Output
Filter
Figure 11 - Air Output, Air Intake, and Lint Filters, 20,5 kW (70,000 Btu/Hr) Model
Air Intake Filter
Filter End
Cover
Fan Guard
Fan Guard
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 6).
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 at right for correct pressure for each model.
5. Remove pressure gauge. Replace pressure gauge plug in filter end cover.
Lint Filter
Air Output
Filter
Figure 12 - Air Output, Air Intake, and Lint Filters, 29,3 kW (100,000 Btu/Hr) Model
(20,5 kW [70,000 Btu/Hr] Model Shown)
Pressure
Gauge
Plug
Figure 13 - Pressure Gauge Plug Removal
Relief
Valve
Pressure
Gauge
Model Pump Pressure
20,5 kW (70,000 Btu/Hr) 34,50 kPa (5.0 PSI)
29,3 kW (100,000 Btu/Hr) 27,60 kPa (4.0 PSI)
Figure 14 - Adjusting Pump Pressure
104252
Continued
9
70,000 AND 100,000 BTU/HR
PORTABLE FORCED AIR HEATER
SERVICE
PROCEDURES
Continued
Nozzle
1. Remove upper shell (see page 8).
2. Remove fan (see page 12).
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 16).
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 (80-110 inch-pounds/
9.1-12.4 n-m).
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 12).
17. Replace fan guard and upper shell.
Combustion
Chamber
Screw
Air Line Hose
Figure 15 - Removing Burner Head
Nozzle
Face
Nozzle
Nozzle
Seal
Burner Head
Fuel Line
Spark Plug
Wire/Boot
Spark
Plug
Burner
Head
Figure 16 - Removing Nozzle
10
104252
OWNER’S MANUAL
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 .003"/
.004" (.076/.101 mm) if needed (see
Figure 19).
Note:
Rotate rotor one full turn to insure the
gap is .003"/.004" (.076/.101 mm) 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 9).
Note:
If rotor is still binding, proceed as
follows.
13. Perform steps 1 thru 6 above.
14. Place fine grade sandpaper (600 grit)
on flat surface. Sand rotor lightly in
“figure 8” motion four times (see Figure 20).
15. Reinstall insert and rotor.
16. Perform steps 10 thru 12 above.
Blade
Pump
Plate
Insert
Rotor
Air Output
Filter
Figure 17 - Rotor Location, 20,5 kW (70,000 Btu/Hr) Model
Blade
Insert
Rotor
Air Output
Filter
Figure 18 - Rotor Location, 29,3 kW (100,000 Btu/Hr) Model
Air Intake
Filter
Filter End
Cover
Pump Plate
Air Intake
Filter
Filter End
Cover
Gap Adjusting Screw
.003"/.004"
(.076/.101 mm) Gap
Measured With
Feeler Gauge
Fan Guard
Fan Guard
Sandpaper
104252
Rotor
Blade
Gap
Adjusting
Screw
Figure 19 - Gap Adjusting Screw
Locations
Figure 20 - Sanding Rotor
Continued
11
70,000 AND 100,000 BTU/HR
PORTABLE FORCED AIR HEATER
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 22).
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.
Remove fan from motor
Setscrew
Motor
Shaft
Figure 21 - Fan, Motor Shaft, and Setscrew
Location
Fan
Motor
Shaft
Figure 22 - Fan Cross Section
Fan
Flush
Setscrew
SPECIFICATIONS
Output Rating (kW) 20,5 29,3
(Btu/Hr) 70,000 100,000
Fuel Use Only Kerosene or No. 1 Fuel Oil
Fuel Tank Capacity
(U.S. Gal./Liters) 5.0/18.92 9.0/34.06
Fuel Consumption
(Gal. Per Hr./Liters Per Hr.) .52/1.97 .73/2.76
Electric Requirements 230 V/50 Hz 230 V/50 Hz
Amperage (Normal Run) 2.0 2.0
Hot Air Output (CFM/CMM) 225/6.36 425/12
RPM 2850 2850
12
104252
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