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Pumping foam using water from booster tank
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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OPERATION IN COLD WEATHER
TM 5-4210-230-14&P-1 4. Prime pump. 5. Close the water tank-to-pump valve on operator's control panel (24, Fig. 3). 6. Open the water-to proportioner valve on operator's control panel (23, Fig. 3). 7. Set  the  foam  metering  valve  (if  not  already  pre-set)  at  appropriate  setting  based  on  type  of  extinguishing agent used (36, Fig. 3). 8. Increase engine speed as required using throttle on operator's control panel (16, Fig. 3) 9. Open foam-to-proportioner valve (37, Fig. 3) 10.  Open nozzle on end of discharge line and operate. 11    DRAINING AND FLUSHING DETAILS A. Draining and flushing the 30 gallon foam concentrate tank. 1. Close the foam-to-proportioner (37, Fig. 3) 2. With a hose, run a sufficient amount of water through the tank to flush the remaining foam concentrate from the tank. 3. Close the foam tank drain valve (12, Fig. 3). WARNING After each operation of the system refill foam tank.  It is highly desirable to keep the liquid level of the tank at the top of the tank. Experience has shown that the possibility of foam contamination may occur in the vapor space above the liquid level. B. Draining the 300 gallon water tank and flushing the discharge line system. 1. Open the drain valve (11, Fig. 3) located below the vehicle left running board to drain the 300 gallon water tank. 4-6

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