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Driving Accessory Air System.
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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Foam Induction System
TM 5-4210-22012 1-19.    FIREFIGHTING  SYSTEM.    Controls  are  provided  in  the  cab  and  on  the  structural  control  panel  to  enable firefighting in CFR or structural mode.  The controls are interlocked to ensure single operator control in CFR mode, the system can only be controlled from the cab.  In structural mode, the system is controlled from the structural control panel. Pump engagement and disengagement however, is always controlled from the cab. CAUTION To prevent inrush surges and engine overspeeding, water must always be available at the pump before  it  is  engaged.    While  operating,  water  supply  to  the  pump  must  be  continuous.    If discontinued, the pump must be shut down immediately to prevent damage. In CFR, pump-and-roll mode, the pump must be disengaged immediately when the water tank is emptied.  Failure to do this can cause loss of vehicle control due to engine overspeeding. a.  Water Supply and Discharge System. (1)    In  CFR  mode  water  to  the  pump  is  always  supplied  from  the  tank,  (see  fig.  1-36)  in  structural  mode,  the supply  can  be  from  the  tank  or  alternative  sources  via  the  suction  manifold.    The  alternative  sources  may  be  fire hydrants,  remote  pumping  units,  or  an  open  reservoir.    If  water  is  drawn  from  the  tank  for  structural  firefighting,  a continuous supply must be secured via the automatic tank fill valve. (2)    Automatic  priming  of  the  fire  pump  takes  place  if  the  pump  is  void  of  water  when  initially  engaged.    The priming pump, driven by the fire pump, evacuates the fire pump suction.  As soon as water pressure is available, the priming pump automatically disengages. (3)  From the pump the water flows via the discharge manifold to the turrets and handline discharge valves (A) and (B). Figure 1-36.  Water Supply and Discharge System Change 6  1-43

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