Desa Theory Of Operation, Fuels, Ventilation, Portable Forced Air Heaters, RJ45 And RJ70

RJ45 And RJ70

PORTABLE FORCED AIR HEATERS

THEORY OF OPERATION FUELS

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.

The Ignition System (RJ45): The igni- tion control assembly provides power to the ignitor. This ignites the fuel/air mixture in the combustion chamber.

The Ignition System (RJ70): The elec- tronic ignitor sends voltage to the spark plug. The spark plug ignites the fuel and air mixture.

The Flame-Out Control System: This system causes the heater to shut down if the flame goes out.

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 diesel. Using heavy fuels will result in:

•clogged fuel filter and nozzle

•the need of nontoxic anti-icer in fuel dur- ing very cold weather

	Combustion Chamber	Ignitor or	Motor	Air Pump
				Air Intake
		Spark Plug	Fan	Filter
Clean				Cool
Heated
				Air In
Air Out
				Air
				Output
				Filter
				Ignition
Fuel	Nozzle		Air Line	Control
		Fuel		Assembly or
Tank		Filter	To Burner	Electronic
				Ignitor
	Air For Fuel	Air For Combustion		Fuel
	System	And Heating

Figure 3 - Cross Section Operational View

IMPORTANT: Use a KEROSENE ONLY storage container. Be sure storage container is clean. Foreign matter such as rust, dirt, or water will cause the control to shut down the heater. Foreign matter may also require you to clean fuel system often.

VENTILATION

WARNING: Follow the mini- mum fresh, outside air ventila- tion requirements. If proper fresh, outside air ventilation is not pro- vided, carbon monoxide poison- ing can occur. Provide proper fresh, outside air ventilation be- fore running heater.

Provide at least a 2800 square-centimeter opening of fresh, outside air for each 25,000 Kcal/Hr rating. Provide extra fresh air if more heaters are being used.

Example:

The RJ45 (11,900 Kcal/Hr) heater requires a 1400 square-centimeter opening of fresh outside air.

The RJ70 (17,600 Kcal/Hr) heater requires a 2000 square-centimeter opening of fresh outside air.

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