TM 9-2350-287-20-12-19. TROUBLESHOOTING CHART (continued).x.NBC SYSTEM.The NBC system consists of four M3 electric air heaters, M2A2 air purifier, NBC control box, related electricalwiring, and the individual crew VFPS and hoses. The relationship of these components is shown in the diagrambelow.To operate the NBC system the MASTER switch and the NBC POWER switch must be turned on. 24vdc issupplied from the batteries, through the MASTER relay to the NBC control box. The NBC control box then appliesthe voltage to each M3type switch.electric air heater. The M3 electric air heaters are individually controlled with a rheostatELECTRICAL SCHEMATIC2-367
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