Desa UKC70ET, BC55CT, BC115DT, BC165DT, UKC115DT, UKC55CT Fuels, Ventilation, Theory of Operation

FUELS

WARNING: Use only kero- sene, #1/#2 diesel/fuel oil, JET A orJP-8fuelstoavoidriskoffireor explosion.Neverusegasoline,oil drained from crankcases, naph- tha, 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 contaminate 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 assembly to shut down heater. Foreign matter may also require heaterʼs fuel system to be frequently cleaned.

VENTILATION

WARNING:Provideafreshair 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 minimum ventilation requirements must be followed to avoid risks as- sociated with carbon monoxide poisoning. Make certain these requirements are met prior to operating heater.

Example: A 200,000 Btu/Hr (58.6 kw) heater requires 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 combus- tion 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 Chamber	Ignitor	Fan Motor	Air Pump Air Intake Filter
Clean			Cool Air In
Heated
Air Out
			Air Output Filter
Fuel
Tank Nozzle	Fuel	Air Line	Ignition Control
	Filter	To Burner	Assembly
Air For Fuel		Air For	Fuel
System		Combustion

And Heating

Figure 5 - Cross Section Operational View

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