TM-9-2540-207-14&P Sustainment Manual for A20 Heater for M113 2540-01-396-2826 Download
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TM 9-2540-207-14&P 1-1 1 INTRODUCTION 1.1 The A20 heater The model A20 heater is an electrically controlled fuel-fired 60,000 BTU/Hr. vehicle personnel heater. It is able to operate from any available 24 Volt dc power source, and produces heat through the combustion of diesel or jet grade fuels. The A20 heater utilizes rotary atomization of fuel in conjunction with a heated wick to provide the rated output of 60,000 BTU/hr. Two separate fan systems are used. The vent fan system provides the heated air at a rate of 205 SCFM, while the burner fan supplies the combustion air. The heater can operate with combustion air drawn either from inside or outside the vehicle, with conversion between single and dual air modes quick and easy. The heater utilizes an on-board computer system for operation control, and to signal to the operator the occurrences of any operating faults or abnormal situations. It is intended to re-circulate and heat air in the crew compartment of military vehicles. The A20 heater meets the requirements of the Class II heater described in specification sheet number: MIL-H-62550D(AT); "Heater Assembly, Combustion Vehicular Compartment, 8.8/17.6 kW (30,000/60,000 BTU/Hr)”. Figure 1.1-1. A20 heater