Fuels; Ventilation; Theory Of Operation - Desa BTU/HR Owner's Manual

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.
The air pump forces air through the air line. The air is then pushed through the nozzle.
The Fuel System:
This air causes fuel to be lifted from the tank. A fine mist of fuel is sprayed into the combustion chamber.
The motor turns the fan. The fan pushes air into and around the combustion chamber.
The Air System:
This air is heated and provides a stream of clean, hot air.
The Ignition System:
air mixture in the combustion chamber.
The Flame-Out Control System:
Combustion
Chamber
Clean
Heated
Air Out
4

THEORY OF OPERATION

The ignition control assembly provides power to the ignitor. This ignites the fuel/
This system causes the heater to shut down if the flame goes out.
Ignitor
Fuel
Fuel
Nozzle
Tank
Filter
Air For Fuel
System
Figure 5 - Cross Section Operational View
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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)
Air Pump
Fan
Motor
Air Line
Ignition Control
To Burner
Assembly
Air For
Combustion
And Heating
Air Intake Filter
Cool
Air
In
Air Output
Filter
Fuel
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