TM 5-6116-590-12 o.  Battery Charge Circuit Breaker. (1) Description.  A press-to-reset circuit breaker installed in the battery charging circuit. (2)    Purpose.       Provides    short    circuit    and    overload protection  for  the  battery  charging  circuit.    The  circuit breaker  opening  amperage  (5  amps)  is  marked  on  the reset button. p.  No Fuel Indicator Lamp. (1) Description.   A filament type press-to-test lamp with a red lens. (2) Purpose.  Illuminates to indicate that power plant has been    shut    down    by    fuel    float    tank    switch    due    to exhaustion of fuel supply. q.  Engine Air Blockage Indicator Lamp. (1) Description.   A filament type press-to-test lamp with a red lens. (2)   Purpose.     Illuminates   to   indicate   that   there   is   a negative pressure differential in the air inlet plenum. r.  Engine Time Totalizing Meter. (1)   Description.       A    five-digit    time    totalizer    counter installed   on   the   side   of   the   engine   accessory   drive gearcase. (2) Purpose.  Records the total engine operating time. (3)   Indication.      The   counter   digits   indicate   the   total operating time in hours and tenths of an hour since the last  resetting  of  the  dials.    The  time  totalizing  meter  is energized and begins recording the operating time when the rpm reaches approximately 95 percent of governed speed and continues until engine shutdown. s.  Engine Time Totalizing Meter Circuit Breaker. (1) Description.  A press-to-reset circuit breaker installed in   the   engine   time   totalizing   meter   circuit.      Located directly below the engine time totalizing meter (2)    Purpose.       Provides    short    circuit    and    overload protection for the time totalizing meter circuit. The circuit breaker  opening  amperage  (3  amps)  is  marked  on  the reset button. 2-3.  Water Systems Controls The  description  and  function  of  the  manually  operated controls   in   the   water   system   are   described   below. Water  system  controls  are  located  on  the  upper  left  of the  instrument  panel  (fig.    2-2),  and  on  the  water  inlet and outlet connection panel (fig. 2-19). a.  Hot Water Pump Switch (1)  Description.     A   two   position   ON   and   OFF   circuit breaker toggle switch. (2)  Purpose.    Energizes  the  hot  water  pump  electrical circuit when placed In the ON position De-Energizes the pump circuit when placed in the OFF position Provides short  circuit  and  overload  protection  for  the  hot  water pump.      Control   of   the   pump   is   automatic   depending upon hot water delivery requirements after the switch is placed in the ON position. b.  Cold Water Pump Switch. (1)  Description.     A   two   position   ON   and   OFF   circuit breaker toggle switch. (2)  Purpose.   Energizes  the  cold  water  pump  electrical circuit when placed in the ON position. De-energizes the pump circuit when placed in the OFF position.  Provides short  circuit  and  overload  protection  for  the  cold  water pump. c.  Cold Water Valve. (1)  Description.     A  manually  operated  valve  installed across the cold water outlet line. (2)  Purpose.   Controls  the  flow  of  cold  water  from  the cold water outlet fitting. d.  Hot Water Valve. (1)  Description.     A  manually  operated  valve  installed across the hot water outlet line. (2) Purpose.  Controls the flow of hot water from the hot water outlet fitting. e.  Hot Water Return Value (1)  Description.     A  manually  operated  valve  installed across the hot water return/hot water tank drain line. (2)   Purpose.      Controls   hot   water   return   and   allows draining of hot water tank. 2-4.          Auxiliary     Power     Outputs     Controls     and Instruments The  auxiliary  power  output  controls  are  located  on  the upper left of the instrument panel (fig.  2-3) immediately above the conditioned air controls. They control delivery of  power  to  the  400  Hz  receptacles  on  the  receptacle panel.  The description and function of the controls and instruments are described below. a.  Auxiliary Power Trip Indicator Lamps (two used: output 1 and output 2). (1)  Description.   Filament  type  press-to-test  lamps  with red lens. (2)  Purpose.     Illuminate  to  indicate  that  the  auxiliary power  output  contactor  has  tripped  to  disconnect  the output to the receptacle indicated (output 1 or output 2). NOTE The  press-to-test  feature  allows  operator  to  test  circuit (Bulb).  Auxiliary power output No. 1 is checked with unit in operation and main 400HZ contactor closed.  The unit does not have to be operating in order to check auxiliary power output No. 2 press-to-test circuit. Change 6 2-3