Desa H.S. I. 110, H.S. I. 115, H.S. I. 165, H.S. I. 150, H.S. I. 155 Owner's Manual
PORTABLE FORCED
AIR HEATER
(WITH BUILT-IN THERMOSTAT)
OWNER’S MANUAL
Heater Sizes:
110,000, 115,000,
150,000, 155,000,
and 165,000 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.
TABLE OF CONTENTS
SAFETY INFORMATION .............................................2
UNPACKING................................................................2
PRODUCT IDENTIFICATION......................................3
ASSEMBLY..................................................................3
FUELS .........................................................................4
VENTILATION..............................................................4
THEORY OF OPERATION ..........................................4
OPERATION ................................................................4
OPERATION WITH PORTABLE GENERATOR ..........5
PREVENTATIVE MAINTENANCE SCHEDULE ..........5
TROUBLESHOOTING.................................................6
Fill In For Your Records
Model No. ___________________
(Located on side panel)
SERVICE PROCEDURES...........................................7
WIRING DIAGRAM.................................................... 11
SPECIFICATIONS ..................................................... 11
STORING, TRANSPORTING, OR SHIPPING........... 11
ILLUSTRATED PARTS BREAKDOWN .....................12
P ARTS LIST...............................................................13
REPLACEMENT PARTS ...........................................15
TECHNICAL SERVICE..............................................15
ACCESSORIES .........................................................15
WARRANTY AND REPAIR SERVICE .......................16
Serial No. ___________________
(Located on fuel tank)
®
• SAFETY INFORMATION
• UNPACKING
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 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.
• Warning to New York City Residents
For Use Only At Construction Sites
in accordance with applicable NYC codes
under NYCFD certificate of approval
#4803, #4899, #4908, #4909, or #4934.
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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104655
PRODUCT
IDENTIFICATION
• PRODUCT IDENTIFICATION
• ASSEMBLY
Hot Air Outlet
Lower Shell
Fuel Cap
Side Cover
Ignition Control Assembly
(assembly on inside of
side cover)
Figure 1 - Portable Forced Air Heater
Upper Shell
ASSEMBLY
These models are furnished with wheels and
a rear handle. Some models are furnished
with a front 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:
point extended hub of wheels toward
wheel support frame (see Figure 2).
2. Place cap nuts on axle ends. Gently tap
with hammer to secure.
3. Place heater on wheel support frame.
Make sure hot air outlet end (front) of
heater is over wheels. Line up holes on
fuel tank flange with holes on wheel
support frame.
4. Place rear handle (and front 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.
When installing wheels,
Fan Guard
Fuel
Tank
Flange
Cap Nut
Figure 2 - Wheel and Handle Assembly
Thermostat Knob
Fuel Tank
Power Cord
Screw
Hot Air
Outlet
Axle
Nut
Wheel
Front
Handle
Rear
Handle
Air Inlet
Extended Hub
Wheel Support Frame
104655
3
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• FUELS
• VENTILATION
• THEORY OF OPERATION
• OPERATION
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 a clogged fuel filter and/or nozzle.
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 three-square-foot opening
of fresh, outside air for each 100,000 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 open-
• a single-car garage door (9 feet wide
• two 30 inch wide windows raised
A 165,000 Btu/Hr heater requires
ing) raised 4 inches
opening) raised 7 inches
twelve inches
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
Fuel
Tank
Figure 3 - Cross Section Operational View
Nozzle
Air For Fuel System
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.
Fuel
Filter
Air For Combustion
And Heating
OPERATION
WARNING: Review and un-
derstand the warnings in the
Safety Information
section, page
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 in-
formation.
2. Fill fuel tank with kerosene or No. 1
fuel oil.
3. Attach fuel cap.
4. Turn thermostat knob clockwise to the
HIGH position.
5. Plug power cord of heater into three-
prong, grounded extension cord. Extension cord must be at least six feet long.
Extension Cord Wire Size
Requirements
• 6 to 10 feet long, use 18 AWG rated
• 11 to 100 feet long, use 16 AWG
• 101 to 200 feet long, use 14 AWG
6. Plug extension cord into standard 120
volt/60 hertz, three-hole, grounded outlet.
seconds then heater will start.
7. Adjust thermostat knob to the desired setting.
Note:
stat setting. This thermostat is a generalheating control. It is not intended for precise
temperature control. Adjust thermostat until heater cycles at the desired setting.
Motor
Fan
Air Pump
Air Intake
Filter
Cool
Air
In
Air
Output
Filter
Air Line
To Burner
Ignition
Control
Assembly
Fuel
cord
rated cord
rated cord
Note
:
Ignitor will preheat for five
A cold heater may affect the thermo-
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104655
• OPERATION
• OPERATION WITH PORTABLE
GENERATOR
• PREVENTATIVE MAINTENANCE
SCHEDULE
OPERATION
Continued
TO STOP HEATER
Unplug extension cord from outlet.
TO RESET HEATER
1. Unplug extension cord from outlet and
wait 10 seconds (two minutes if heater
has been running).
2. Turn thermostat knob clockwise to the
HIGH position.
3. Plug extension cord into standard 120
volt/60 hertz, three-hole, grounded outlet.
Note:
Ignitor will preheat for five
seconds then heater will start.
4. Adjust thermostat knob to the desired setting.
OPERATION WITH
PORTABLE
GENERATOR
WARNING: Before operating
heater or any appliance from a
portable generator, verify that
generator has been properly connected to earth ground. Improper
grounding or failure to ground
generator can result in electrocution if a ground fault occurs.
Refer to owner’s manual supplied
by generator manufacturer for
proper grounding procedures.
The operating voltage range of the heater is
108 to 132 Volts (120 Volts +/- 10%). Prior
to plugging heater into generator the output
voltage should be verified (if generator is
equipped with the automatic idle feature, the
output voltage should be measured with the
generator running at full speed). If the voltage does not measure in this range the heater
should not be plugged into the generator.
Refer to Operation, pages 4 and 5, for starting, stopping, and resetting heater procedures.
Ground Lug
EL
FU
F
Copper
or Brass
Grounding
Point
Alternator
Figure 4 - Typical Generator Grounding
Method (Generator construction may vary
from that shown)
Ground Wire (#10 AWG
Stranded-Copper)
PREVENTATIVE MAINTENANCE SCHEDULE
WARNING: Never service heater while it is plugged in, operating, or
hot. Severe burns and electrical shock can occur.
Item
Fuel tank
Air output and lint filters
Air intake filter
Fuel filter
Ignitor
Fan blades
Motor
104655
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 an 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
5
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How To
See Storing, Transporting, or Shipping,
page 11
See Air Output, Air Intake, and Lint Filters,
page 7
See Air Output, Air Intake, and Lint Filters,
page 7
See Fuel Filter, page 8
See Fan, page 7
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