Fully Enclosed Portable Heater


Aerotech Herman Nelson now announces the launch of the BT400-47. It features a removable electric prime mover. This permits removal of the electric motor for cold weather storage. Operation is extremely quiet and highly efficient. A fully fueled BT400-47 can run for twelve hours. Aerotech also offers a silent running generator to power the 47 if remote operation is required. Ruggedness is a key trait of the Herman Nelson. Herman Nelsons have been field tested to temperatures as low as -65 degrees Fahrenheit. Even after having been idle for prolonged periods in the cold, the Herman Nelson will get your equipment functioning and buildings inhabitable. SAC Alaska and Antarctic bases all depend on the Herman Nelson for rapid heating performance under the harshest conditions. The electric motor driven 47 delivers 300,000 BTUs with a discharge temperature of 150 degrees Fahrenheit to 280 degrees Fahrenheit. The air delivery rate of up to 1,500 cubic feet per minute makes the BT400-47 also useful for ventilation and like all Herman Nelsons this new product comes with a variety of optional ducting accessories to direct heat or air where you need it. How Does a Herman Nelson Work? Power Unit The BT400-47 Herman Nelson heater is supplied with an electric motor prime mover. A drive coupling is attached to the drive shaft of the motor and is attached to a driven coupling by way of a flexible rubber sleeve. The drive coupling drives the heater fan and through a pulley, a V-belt drives the fuel pump and the heater ignition coil. Fuel System The BT400-47 Herman Nelson fuel system supplies a variety of fuel to the combustor. Fuel is drawn from a removable 35 gallon fuel tank through an automotive type fuel filter by a belt driven fuel pump. Fuel flows through the nozzle contained in a holder with inlet and bypass fuel lines. As the fuel leaves the nozzle it is atomized and ignited by the igniter plug. Fuel is also bypassed from the nozzle, through a check valve, to the temperature selector valve on the control panel. The check valve prevents a reverse flow. Heat Exchanger Fuel flowing from the nozzle is ignited in the combustor. The burning fuel strikes a plate or target in the combustor and is diffused into the heat exchanger. Air from the fan enters holes in the side of the combustor in a manner that will ensure proper fuel-air mixture. The burning fuel flows through the heat exchanger in a spiral path between the surfaces of the ventilating air tubes and is expelled through the exhaust opening at the top of the casing. Ventilating or heating air is forced through the ventilating air tubes and the space between the heat exchanger shell and the casing. A damper control which is locked by a handwheel mounted in a slot above the discharge end of the heater, is used to reduce heat output, by reducing the air volume without reducing the temperature. Volume can be set between full and one-half of full volume. The clean air discharge has a carbon monoxide content of less than 35ppm.
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