Desa RJ70 - Manual (Page 4)

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PORTABLE FORCED AIR HEATERS
RJ45 And RJ70
Figure 3 - Cross Section Operational View
Fuel
Filter Air Line
To Burner
Air
Output
Filter
Air Pump
Air Intake
Filter
Cool
Air In
Fan
Combustion Chamber
Ignitor or
Spark Plug
Motor
Clean
Heated
Air Out
Ignition
Control
Assembly or
Electronic
Ignitor
Air For Fuel
System Air For Combustion
And Heating
Fuel
Nozzle
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.
Fuel
Tank
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.
THEORY OF OPERATION
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.
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
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.
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.
VENTILATION
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.