Desa H.S.I. Series owner manual Theory, Operation, Fuels

THEORY OF	The Fuel System: The air pump forces air through the air line. The air is then
OPERATION	pushed through the burner head 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: The electronic ignitor sends voltage to the spark plug.
	The spark plug ignites the fuel and air mixture.
	The Flame-Out Control System (EDI Models Only): This system causes
	the heater to shut down if the flame goes out.
				Motor	Air Pump
	Combustion	Spark	Burner	Fan	Intake
	Chamber	Plug			Air
			Head
					Filter
Clean					Cool
Heated					Air
Air Out					In
					Output
					Air
					Filter

Fuel	Nozzle	Fuel	Air line	Electronic
Tank		Filter	To Burner	Ignitor
	Air For Fuel		Air For Combustion	Fuel
	System		And Heating
	Figure 5 - Cross Section Operational View

FUELS WARNING

Use only kerosene or No. 1 fuel oil to avoid risk of fi re or explosion. Never use gasoline, naphtha, paint thinners, alcohol or other highly fl ammable 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

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

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

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