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
5. CONSTRUCTION:
The majority of the heater is manufactured using corrosion resistant stainless steel. The combustion
tube is a welded, gas tight container consisting of the combustion chamber/ radiator assembly with
HET’s exclusive Durakoat coating applied to high wear areas for longer life. The combustion tube is
encased in a stainless steel shroud or 'jacket' assembly. Space between the tube and shroud provides an
area for heat transfer. The ventilation fan, combustion air inlet and fuel feed assembly are located at
one end while the air outlet and exhaust are generally located at the other. On the inlet end of the
combustion tube is the ‘head assembly' where the fuel feed and nozzle assembly that houses the spray
nozzle are attached. Externally mounted is the ignition assembly, fuel solenoid, & wire mounting
terminal board. A combination of mechanical and solid state switches are used to regulate heat and
airflow. These switches also provide safety control for shut down of unit in the event of malfunction.
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