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FIREFIGHTING  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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System Interlock Control - Structural Mode.
TM 5-4210-220-12 1-19.  FIREFIGHTING SYSTEM.  - Continued b.  Foam Induction System. (1)  Foam concentrate is released from the foam tank and metered into the water flow to the pump, (see fig. 1-37). In CFR mode, the control valves through which the concentrate is released and metered are operated from the cab.  In structural mode, these functions are controlled from the structural control panel.  To produce foam, water (derived from the  pump  discharge)  is  cycled  through  the  eductor  into  the  pump  suction.    In  the  eductor,  the  water  draws  the  foam concentrate into the flow by venturi action. (2)  To remove residual foam from the foam lines after firefighting, the foam tank valve is closed and the flush valve is opened.  Water from the pump discharge is then cycled through the metering valves and through the eductor. Figure 1-37.  Foam Induction System c.  Pump and System Interlock Control - CFR Mode. (1)  When the tank valve is opened in CFR mode, the switch (A), located on the tank valve, closes.  This action causes the TANK VALVE OPEN indicator to illuminate and also enables the circuit to the pump switch, (see fig. 1-38). (2)  When the pump is switched ON, the PTO solenoid valve is energized.  This allows pressurized oil from the transmission  to  engage  the  PTO  clutch.    The  oil  pressure  also  triggers  the  oil  pressure  switch  causing  the  PUMP ENGAGED indicator to illuminate and the throttle control solenoid valve (L) to energize The pressure switch (C) remains closed since no air pressure is applied to manifold # 2 in CFR mode, (see para. 1-19 e.) 1-44

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