PERSONNEL HEATER SYSTEM

TM 5-5420-226-20-1 SYSTEMS OPERATION - Continued PERSONNEL HEATER SYSTEM. Provides heater air for vehicle crew. Circulates air through vehicle in air duct system. Air flow speed is constant. Heater switch has two heater selections, low and high. (.4) (B) (c) (D) (E) (F) (G) PERSONNEL HEATER. Combustion type heater, burns same fuels as engine in a sealed heat exchanger. Combustion air and air to be heated supplied by two separate blowers on a single blower motor. Combustion air fan flows air into primary and secondary combustion air openings where air flows around circular channel in combustion chamber. Combustion products are exhausted to outside through flexible metal hose coupled through hull to metal exhaust tube mounted on right front fender. FUEL SYSTEM. Fuel flows from personnel heater fuel pump forward of driver’s station to heater where fuel flow is regulated by solenoid-actuated fuel control valve on top of heater case. Fuel control valve is controlled by personnel heater switch on master control panel. IGNITION CONTROL. Fuel enters through two standpipes on heater and is ignited in combustion chamber by glow-plug-type igniter. Electric heating element in fuel control valve preheats fuel for cold weather starts. FLAME DETECTOR SWITCH. Shuts off heater motor after flame in heater is established and permits blower to operate. OVERHEAT SWITCH. Safety switch to shut off fuel flow when heater temperature exceeds safe maximum limits. IGNITOR. A glow-plug-type igniter, ignites fuel in combustion chamber. DUCTS AND TUBES. Ventilating air blower forces air through slots in heat exchanger and circulates air through a duct and transition box assembly. _ - “(A) (B) (c) (D) (E) (F) (G) FUEL CONTROL VALVE FLAME DETECTOR SWITCH OVERHEAT SWITCH IGNITER DUCTS AND TUBES 2-31