TM 9-2350-256-102-13. OPERATION OF AUXILIARY EQUIPMENT-Continued.3.Hold PREHEAT switch (4) down for: 20 seconds if temperature is above 55°F (13°C) or 1 minuteif it is below 55°F (13oC).NOTEIn extremely cold weather (32 to -25°F [0 to -32°C]), see paragraph 2-16b for coldweather starting instructions.4.Turn START switch (5) to ON and hold until engine starts. If engine does not start in 1 minute,release START switch and keep PREHEAT switch (4) down for another 20 seconds or 1 minuteand try again. If engine still does not start, troubleshoot (see tab. 3-1).5.When engine starts, release two switches (4 and 5).CAUTIONIf LOW OIL PRESSURE light (3) stays on after engine starts or comes on whileengine is running, Turn FUEL SHUTOFF switch (2) to OFF. Stop APU andtroubleshoot.6.Let APU warm up for 3 minutes before turning on generator switch or operating the auxiliaryhydraulic system.CAUTION·Do not run APU for longer than 1 hour with generator or hydraulics engaged ina heavy load condition. After 1 hour, turn off auxiliary generator or hydraulicsystem. Run engine to allow it to cool before engaging hydraulics or generatoragain.·If HIGH AIR TEMP light (6) comes on during operation, turn off APU and let itcool. If light comes on often, notify unit maintenance.7.While APU is operating, frequently check APU CONTROL BOX for possible malfunctions.8.To stop, turn APU GEN and FUEL SHUTOFF switches (1 and 2) to OFF.9.If FUEL SHUTOFF switch (2) does not stop APU, turn MASTER switch to OFF.2-176
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