Desa 35 User Manual
PORTABLE
FORCED
AIR HEATER
OWNER’S MANUAL
Heater Sizes:
35,000, 50,000, and 55,000 Btu/Hr
H.S.I. Series
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.
®
ARL LOGO
G 004
35,000, 50,000, And 55,000 Btu/Hr H.S.I. Series
PORTABLE FORCED AIR HEATERS
SAFETY
INFORMATION
WARNINGS
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 federal, state, and local 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 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 federal, state, or local 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 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 threesquare-foot opening of fresh, outside
air for each 100,000 Btu/Hr of rating.
This heater produces carbon monoxide,
which is listed by the State of California as a reproductive toxin under Proposition 65.
• 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: 8 Ft. Sides: 4 Ft.
Top: 4 Ft. Rear: 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.
UNPACKING
1. Remove all packing items applied to
heater for shipment.
2. Remove all items from carton.
3. Check items for shipping damage. If
heater is damaged, promptly inform
dealer where you bought heater.
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102388
OWNER’S MANUAL
PRODUCT IDENTIFICATION
Hot Air Outlet
Lower Shell
Fuel Tank
Side Cover
Ignition Control Assembly
(assembly on inside of side cover)
Power Cord
Figure 1 - 55,000 Btu/Hr Model Shown
THEORY OF OPERATION
The Fuel System: The air pump forces air
through the air line. The air is then pushed
through the 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.
Combustion Chamber
Ignitor
Clean
Heated
Air Out
The Ignition System: The ignition con-
trol assembly provides power to the ignitor.
This ignites the fuel/air mixture in the combustion chamber.
The Flame-Out Control System: This
system causes the heater to shut down if the
flame goes out.
Handle
Motor
Fan
Upper Shell
Fan Guard
Air Pump
Air Filter
End Cover
Fuel Cap
Air Intake
Filter
Cool
Air In
Air
Output
Filter
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
• the need of nontoxic anti-icer in fuel during very cold weather
IMPORTANT:
Use a KEROSENE ONLY
storage container. Be sure storage container is
clean. Foreign matter such as rust, dirt, or
water will cause the ignition control assembly
to shut down the heater. Foreign matter may
also require you to clean fuel system often.
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 at least a two-square-foot opening
of fresh, outside air for each 55,000 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
opening) raised 1 1/2 inches
• a single-car garage door (9-feet-wide
opening) raised 2 1/2 inches
• two windows (30-inches-wide opening)
raised 4 1/2 inches
A 55,000 Btu/Hr heater requires
Fuel
Tank
Figure 2 - Cross Section Operational View
102388
Nozzle
Air For Fuel
System
Fuel
Filter
Air Line
To Burner
Air For Combustion
And Heating
Ignition
Control
Assembly
Fuel
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35,000, 50,000, And 55,000 Btu/Hr H.S.I. Series
PORTABLE FORCED AIR HEATERS
OPERATION
WARNING: Review and un-
derstand the warnings in the
Safety Information
2. They are needed to safely operate this heater. Follow all local
codes when using this heater.
TO START HEATER
1. Follow all ventilation and safety information.
2. Fill fuel tank with kerosene or No. 1
fuel oil.
3. Attach fuel cap.
4. Plug power cord of heater into threeprong, grounded extension cord. Extension cord must be at least six feet long.
Section, page
Extension Cord Wire Size
Requirements
• 6 to 10 feet long, use 18 AWG rated
cord
• 11 to 100 feet long, use 16 AWG
rated cord
• 101 to 200 feet long, use 14 AWG
rated cord
5. Plug extension cord into standard 120
volt/60 hertz, three-hole, grounded outlet.
Note:
Ignitor will preheat for five
seconds then heater will start.
TO STOP HEATER
Unplug extension cord from outlet.
TO RESTART HEATER
1. Unplug extension cord from outlet and
wait 10 seconds (two minutes if heater
has been running).
2. Plug extension cord into standard 120
volt/60 hertz, three hole, grounded outlet.
Note:
Ignitor will preheat for five
seconds then heater will start.
STORING,
TRANSPORTING,
OR SHIPPING
Note:
If shipping, transport companies re-
quire fuel tanks to be empty.
1. Drain fuel tank. Drain fuel through fuel
cap opening. Be sure all fuel is removed.
2. 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.
3. Replace fuel cap. Properly dispose of old
and dirty fuel. Check with local automotive service stations that recycle oil.
4. 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
WARNING: Never service
heater while it is plugged in, operating, or hot. Severe burns and
electrical shock can occur.
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 replace as needed.
Clean twice a heating season or replace as
needed.
No maintenance required.
Clean each season or as needed.
Not required/permanently lubricated.
How To
See Storing, Transporting, or Shipping,
above.
See Air Output, Air Intake, and Lint Filters,
page 6.
See Air Output, Air Intake, and Lint Filters,
page 6.
See Fuel Filter, page 7.
See Fan, page 6.
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102388
OWNER’S MANUAL
TROUBLESHOOTING
FAULT CONDITION
Motor does not start five seconds after heater
is plugged in.
Motor starts and runs but heater does not
ignite.
WARNING: Never service heater while it is plugged in, operating, or
hot. Severe burns and electrical shock can occur.
POSSIBLE CAUSE
1. No power to heater
WARNING: High voltage!
2. Bad electrical connection between motor and ignition control assembly or ignition assembly and power cord
3. Binding pump rotor
4. Defective ignition control assembly
5. Defective motor
1. No fuel in tank
2. Pump pressure incorrect
3. Dirty fuel filter
4. Obstruction in nozzle
5. Water in fuel tank
WARNING: High voltage!
REMEDY
1. Check circuit breaker in electrical panel.
2. Check all electrical connections. See
Wiring Diagrams, page 10.
3. If fan does not turn freely, see Pump Ro-
tor, page 8.
4. Replace ignition control assembly.
5. Replace motor.
1. Fill tank with kerosene.
2. See Pump Pressure Adjustment, page 6.
3. See Fuel Filter, page 7.
4. See Nozzle, page 8.
5. Drain and flush fuel tank with clean
kerosene. See Storing, T ransporting, or
Shipping, page 4.
Heater ignites but ignition control assembly
shuts heater off after a short period of time.
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
5. Photocell assembly not properly installed (not seeing the flame)
6. Dirty photocell lens
WARNING: High voltage!
7. Bad electrical connection between photocell and ignition control assembly
8. Defective photocell
9. Defective ignition control assembly
6. Check electrical connections. See Wir-
ing Diagrams, page 10.
7. Replace ignitor, see page 7.
8. Replace ignition control assembly.
1. See Pump Pressure Adjustment, page 6.
2. See Air Output, Air Intake, and Lint Fil-
ters, page 6.
3. See Fuel Filter, page 7.
4. See Nozzle, page 8.
5. Make sure photocell boot is properly
seated in bracket.
6. Clean photocell lens.
7. Check electrical connections. See Wir-
ing Diagrams, page 10.
8. Replace photocell.
9. Replace ignition control assembly.
102388
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