Desa BTU/HR - Manual (Page 4)

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FUELS
WARNING: Use only kero-
sene, #1/#2 diesel/fuel oil, JET A
or JP-8 fuels to avoid risk of fire
or explosion. Never use gaso-
line, oil drained from crankcases,
naphtha, paint thinners, alcohol
or other highly flammable fuels.
Use only kerosene, #1/#2 diesel/fuel oil, JET A or
JP-8 fuels. Heavier fuels such as No. 2 fuel oil or
No. 2 diesel fuel may also be used but will result in:
• noticeable odor
• additional fuel filter maintenance
• the need for nontoxic, anti-icer additives in very
cold weather
Do not use fuels heavier than No. 2 grade or heavy
oils such as oil drained from crankcases. These
heavy oils will not ignite properly and will con-
taminate the heater.
IMPORTANT:
Use a KEROSENE ONLY (blue) or
DIESEL ONLY (yellow) storage container. Be sure
storage container is clean. Foreign matter such as
rust, dirt, or water will cause the ignition control as-
sembly to shut down heater. Foreign matter may also
require heater's fuel system to be frequently cleaned.
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 be lifted 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 system causes the heater to shut down if the flame goes out.
Figure 5 - Cross Section Operational View
Clean
Heated
Air Out
Fuel
Filter
Air Line
To Burner
Air Output
Filter
Air Pump
Air Intake Filter
Cool
Air
In
Fan
Combustion
Chamber
Ignitor
Ignition Control
Assembly
Air For Fuel
System
Air For
Combustion
And Heating
Fuel
Nozzle
Fuel
Tank
VENTILATION
WARNING: Provide a fresh
air opening of at least three
square feet (2,800 square cm)
for each 100,000 Btu/hr rating.
Provide extra fresh air if more
heaters are being used. The mini-
mum ventilation requirements
must be followed to avoid risks
associated with carbon monox-
ide poisoning. Make certain
these requirements are met prior
to operating heater.
Example: A 200,000 Btu/Hr (58.6kw) heater re-
quires one of the following:
• a two-car garage door [16 feet (4.88 meter)
opening] raised 5 inches (12.7 cm)
• a single-car garage door [9 feet (2.74 meter)
opening] raised 8 inches (20.3 cm)
• two, 30 inch (76.2 cm) windows raised 15
inches (38.1 cm)
Motor