TM 9-2320-280-20-1
1-31. AMBULANCE PATlENT COMPARTMENT FUEL BURNING HEATER SYSTEM
OPERATION
The ambulance patient compartment fuel burning heater in the M996, M996A1, M997, M997A1, and
M997A2 vehicles are similar in that they are multi-fuel burning and heat filtered fresh air. Major
components of the fuel burning heater system are:
FRESH AIR INTAKE GRILLE — The entry point of fresh air for the heater and ventilation system.
The grille stops large debris from entering the system.
FRESH AIR FILTER — Filters out dust and dirt which could foul the system.
FUEL BURNING HEATER — A self-contained heater/blower unit which heats filtered fresh air
with a heat exchanger and forces it out to heat vents in the patient compartment.
HEATER EXHAUST PIPE — Outlet for exhaust gases from fuel burning heater.
HEATING/VENTILATION AND AIR-CONDITIONING SYSTEM (HVAC) CONTROL BOX —
The central point of operation for fuel burning heater.
ELECTRICAL SYSTEM FUSE BOX — Provides electrical overload protection for the
HVAC system.
MANUAL SHUTOFF VALVE — Stops fuel flow to heater in an emergency or when performing
maintenance on the heater.
FUEL FILTER — Filters contaminants out of the fuel for efficient burning.
FUEL PUMP — Pumps fuel out of the fuel tank and provides fuel pressure to the rest of the system.
Pump will not draw fuel if tank is below 1/4 tank.
FUEL TANK — The supply point of fuel for fuel burning heater.
FUEL LINES — Supply fuel to the fuel burning heater.
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