Desa R110M3 User manual

ARL LOGO G 004
®
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.
Heater Sizes: 70,000 110,000 150,000 BTU/Hr
Featuring: Built-In Thermostat with LCD Display
PORTABLE
FORCED
AIR HEATERS
OWNER’SMANUAL

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101697
Safety Information.........................................................................2
Product Identification .................................................................... 4
Unpacking .....................................................................................5
Assembly .......................................................................................5
Theory of Operation ......................................................................6
Fuels ..............................................................................................6
Ventilation .....................................................................................7
Operation Without Thermostat .....................................................7
Operation With Thermostat........................................................... 8
Storage ........................................................................................... 10
Preventative Maintenance Schedule ............................................. 10
Troubleshooting.............................................................................11
Service Procedures ........................................................................ 13
Upper Shell Removal..............................................................13
Fan........................................................................................... 13
Air Output, Air Intake, and Lint Filters..................................14
Pump Pressure Adjustment..................................................... 14
Fuel Filter................................................................................ 15
Spark Plug............................................................................... 15
Nozzle .....................................................................................16
Pump Rotor ............................................................................. 17
Specifications................................................................................. 18
Wiring Diagram............................................................................. 18
Maintenance Kits...........................................................................19
Accessories ....................................................................................19
Warranty and Repair Service ........................................................Back Cover
CONTENTS SECTION PAGE
!
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.
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.
!
DANGER
Carbon monoxide poisoning may lead to death!
SAFETY
INFORMATION
Continued

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101697
SAFETY
INFORMATION • 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 reser-
voir integral with the heater unit).
g) Whenever possible, fuel storage shallbeconfined toareas where floorpenetra-
tions 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. Never use heater in areas with high dust content.
• Minimum heater clearances from combustibles:
Outlet: 8 Ft. Sides: 4 Ft. Top: 4 Ft. Rear: 4 Ft.
• Heaters used in the vicinity of tarpaulins, canvas, or similar enclosure
materials shall be located a safe distance from such materials. The recom-
mended 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. Provide at least three square feet 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 a three-prong, grounded extension cord. Use only with the electrical
voltage and frequency specified on model plate.
• Unplug heater when not in use.
• Never block air inlet (rear) or air outlet (front) of heater. Never attach duct
work to front or rear of heater.
• 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.
• Never move, handle, refuel, or service a hot, operating, or plugged-in heater.
• When used with thermostat, heater may start anytime.
• Keep children and animals away from heater.
• Never use heater in living or sleeping areas.
• Follow all local ordinances and codes when using heater.
Continued

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PRODUCT
IDENTIFICATION
Upper Shell
Hot Air Outlet
Lower Shell
Side Cover
Fan Guard
Handle
Figure 3 - Flame Control Display
Figure 1 - 70,000 BTU/Hr Model
Air Filter
End Cover
Fuel Cap
Fuel Tank
Power Cord
Lower
Shell
Side Cover
Figure 2 - 110,00 and 150,000 BTU/Hr Models
Upper Shell
Fuel Cap
Power Cord
Fan Guard
Hot Air
Outlet
Fuel Tank
OFF Button
ON/Reset Button
Flame Control Display
(see Figure 3, below)
Flame Control Display
(see Figure 3, below)

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These models are furnished with wheels and a front handle. Some models are
furnished with a rear handle also. Wheels, handle(s), 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: When installing wheels, 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 if provided) 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.
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.
ASSEMBLY
(For 110,000 and 150,000
BTU/Hr Models Only)
UNPACKING
Figure 4 - Wheel and Handle Assembly,
110,000 and 150,000 BTU/Hr Models Only
Front
Handle
Screw
Hot Air
Outlet
Fuel
Tank
Flange
Rear
Handle
Air
Inlet
Extended
Hub
Axle
Nut
Cap Nut
Wheel
Wheel
Support
Frame

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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 system (part of the flame control) sends
voltage to the spark plug. The spark plug ignites the fuel and air mixture.
The Flame Control System: This system monitors the combustion process
inside the heater. The flame control will shut down the heater when it is out of
fuel or when flame is unstable.
THEORY CUTAWAY PFA/OV 003
Air For Fuel
System Air For Combustion And Heating Fuel
Combustion
Chamber Air
Intake
Filter
Clean
Heated
Air Out
Cool
Air
In
Air
Output
Filter
Fuel
Tank
Figure 5 - Cross Section Operational View
Burner
Head
Spark
Plug
Motor
Fan
Nozzle
Air Pump
Air Line
To Burner
Fuel
Filter Ignition System
Flame Control
WARNING
!
FUELS
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
• the need of non-toxic 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 flame
control to shut down heater. Foreign matter may also require you to clean fuel
system often.

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101697
WARNING
!
VENTILATION
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 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 raised six inches
• a single-car garage door raised nine inches
• two, thirty-inch windows raised twelve inches
OPERATION
WITHOUT
THERMOSTAT
WARNING
!
To Start Heater (for continuous operation without thermostat)
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 three-prong, grounded extension cord. Exten-
sion cord must be at least six feet long.
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. Heater will display ambient temperature and “OFF” (see Figure 6). If
not, check status of display and refer to Troubleshooting, pages 11 and 12.
6. Press (ON/Reset) Button (see Figure 6) until display flashes. Heater will
start when button is released.
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.
Continued
Figure 6 - ON/Reset Button Location
ON/Reset Button

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101697
OPERATION
WITHOUT
THERMOSTAT
To Stop Heater
Press (OFF) button.
Continued
OFF Button
To Restart Heater
Repeat steps under To Start Heater, page 7.
!
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.
OPERATION
WITH
THERMOSTAT
WARNING
To Start Heater (with thermostat operation)
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 three-prong, grounded extension cord. Exten-
sion cord must be at least six feet long.
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. Heater will display ambient temperature and “OFF” (see Figure 6, page
7). If not, check status of display and refer to Troubleshooting, pages 11 and 12.
6. Press button until display flashes. Release button. Heater will flash the
current thermostat set temperature (F˚) for 10 seconds. Press and hold
button to increase thermostat setting or button to decrease thermostat
setting. Display will automatically advance to next screen 4 seconds after the
last adjustment.
Figure 8 - Adjusting Thermostat
Figure 7 - OFF Button Location

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7. Display alternates between “th” and the temperature selected. Heater has
accepted the new thermostat setting. Press button to activate the new
thermostat setting and start heater operation with thermostat.
NOTE: This thermostat has a 6˚F differential. Example: With thermostat set at
72˚F, the heater will cycle ON if the ambient temperature drops to 69˚F. The
heater will cycle OFF when the ambient temperature rises to 75˚F.
To Change Thermostat Setting During Operation
1. Press button until display flashes. The heater will stop and the display will
flash the current thermostat setting.
2. Press and hold button to increase thermostat setting or button to decrease
thermostat setting. Display will automatically advance to next screen 4 seconds
after the last adjustment.
3. Display alternates between “th” and the temperature selected . Heater has
accepted the new thermostat setting. Press button to activate the new
thermostat setting and start heater operation with thermostat.
To Stop Heater
Press (OFF) button.
Figure 9 - Alternating Between “th” and the Temperature Selected
To Restart Heater
Repeat steps under Operation With Thermostat, page 8 to operate heater with
thermostat. Refer to step under Operation Without Thermostat, page 7 to operate
heater without thermostat.
Figure 10 - OFF Button Location
OFF Button

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STORAGE 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 used.
3. Add one gallon of clean kerosene to fuel tank.
4. Attach fuel cap.
5. Move heater forwards and backwards to stir fuel.
6. Remove fuel cap or drain plug and drain fuel tank. Be sure all fuel is removed.
7. Replace fuel cap or drain plug. Properly dispose of old and dirty fuel.
8. Store heater in dry place. Make sure storage place is free of dust and corrosive
fumes.
IMPORTANT: Do not store kerosene over summer months for use during next
heating season. Using old fuel could damage heater.
WARNING
!
PREVENTATIVE
MAINTENANCE
SCHEDULE
Item How Often How To
Fuel tank Flush every 150-200 hours See Storage above.
of operation or as needed.
Air output and Replace every 500 hours of See Air Output, Air Intake,
lint filters operation or once a year. and Lint Filters, page 14.
Air intake Wash and dry with soap and See Air Output, Air Intake,
filter water every 500 hours of op- and Lint Filters, page 14.
eration or replace as needed.
Fuel filter Clean twice a heating season See Fuel Filter, page 15.
or replace as needed.
Spark plug Clean and regap every 2,000 See Spark Plug, page 15.
hours operation or replace
as needed.
Fan blades Clean each season or as needed. See Fan, page 13.
Motor Not required/permanently lubricated
Never service heater while it is plugged in, operating, or
hot. Severe burns and electrical shock can occur.