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Foam Induction 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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Figure 1-39.  Water and Foam Control - CFR Mode
TM 5-4210-220-12 1-19.  FIREFIGHTING SYSTEM. - Continued d.  System Interlock Control - Structural Mode. (1)  In structural firefighting mode air, manifold # 2 is pressurized, (see fig. 1-40) and the circuit to the pump switch is enabled via the closed contacts of pressure switch (B).  The control circuit through valve switch (A) is by-passed thus allowing the water tank valve to be open or closed as required.  A diode between the switch (B) and the TANK VALVE OPEN indicator prevents the indicator from being energized when the tank valve is closed. (2)  When the pump is switched ON,  the  PTO  solenoid  valve  is  energized.    Pressurized  oil  from  the  transmission engages the PTO clutch and triggers the oil pressure switch.  This causes the PUMP ENGAGED indicator to illuminate. The  pressure  switch  (C)  is  open,  triggered  by  air  pressure  in  manifold  #  2  (see  para.  1-19  f.)  and  the  throttle  control solenoid valve (L) is de-energized in this state automatic throttle governor control is locked out. Figure 1-38.  System Interlock Control Change 6  1-45

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