Desa SB600D, SB350D Theory Of Operation, Fuels, Ventilation, Fresh Air Opening Requirements

HIGH PRESSURE PORTABLE FORCED AIR HEATER 350,000 AND 600,000 BTU/HR

THEORY OF

OPERATION

The Fuel System: The motor turns the fuel pump. The fuel pump pulls fuel from the fuel tank. The fuel pump pushes fuel through a filter and a solenoid valve and out the burner head nozzle. 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 electronic ig- nitor 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. It also allows the fan to continue running after normal shutdown of heater. This cools the combustion chamber.

FUELS

WARNING: Use only kerosene or No. 1 fuel oil to avoid risk of fire or explosion. Never use gaso- line, naphtha, paint thinners, al- cohol, 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:

•clogged fuel filter and nozzle

•carbon build-up on spark plug

•the need of non-toxic anti-icer in fuel during very cold weather

IMPORTANT: Use a KEROSENE ONLY storage container. Be sure storage container is clean. Foreign matter such as rust, dirt, or water will cause flame-out control to shut down heater. Foreign matter may also re- quire 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.

Fresh Air Opening

Requirements

	Square Feet
Heater Size	Opening
350,000 Btu/Hr	10.5
600,000 Btu/Hr	18.0

Note: If you use more than one heater, provide extra fresh air. Provide a fresh air opening of at least three square feet for each 100,000 Btu/Hr rating.

			Solenoid	Fuel Pump/
Combustion		Burner	Valve	Fuel Filter
Chamber	Spark		Fan	Motor
	Plug	Head
Clean
Heated
Air Out				Cool
				Air In

Fuel

Pickup

Line

Fuel Tank	Nozzle	Fuel Line To	Electronic Ignitor	Fuel
		Solenoid Valve		Filter

Air for Combustion	Fuel
and Heating
Figure 3 - Cross Section Operational View

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