2900 Selma Highway, Montgomery AL 36108 USA
PH: +1.334.386.5400 (option 2) FAX: +1.334.386.5450 WEB: www.hartzell.aero
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MM10001
Dated 1/1/08
Rev L dated 5/21/15
6. OPERATION:
In order for the heater to operate properly, it must have (1) an external power source, (2) ignition, (3)
combustion air, (4) ventilation air and (5) a fuel source. Heat in the combustion chamber or tube is
achieved by burning a fuel to air mixture of proper proportions. Any deviation of this ratio will cause
reduced heat output, poor operation, and shortened TBO. For the following, assume that these are
provided as required.
Properly atomized spray from a specially designed fuel nozzle, a balanced combustion air inlet and
exhaust, coupled with a continuous spark ignition, ensures instant firing and continuous burning under
all flight conditions. Heat is provided by burning this fuel-air mixture in the combustion chamber of
the heater. Jet or aviation fuel is injected into the combustion chamber through the spray nozzle. A
cone-shaped fuel spray mixes with combustion air and is ignited by a spark from the spark plug.
Electric current for ignition is supplied by an ignition unit which converts 12- volts or 24 volts to high-
voltage, oscillating current to provide a continuous spark across the spark gap. A shielded, high voltage
lead connects the spark plug to the ignition assembly. Combustion air enters the combustion chamber
tangent to its surface and imparts a whirling or spinning action to the air. This produces a whirling
flame that is stable and sustains combustion under the most adverse conditions.
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