Desa BTU/HR owner manual Fuels, Ventilation, Theory Of Operation, Cross Section Operational View

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.

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)

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.

Combustion Ignitor Chamber

Air Pump

Fan Motor

Air Intake Filter

Clean	Cool
Heated	Air
Air Out	In
	Air Output
	Filter

Fuel	Nozzle Fuel	Air Line	Ignition Control
		To Burner
Tank			Assembly
	Filter

Air For Fuel	Air For	Fuel
	Combustion
System
	And Heating

Figure 5 - Cross Section Operational View

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