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Structural Firefighting (cont) - TM-5-4210-220-12_121
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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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Operating 110-Vac Auxiliary Equipment
TM 5-4210-220-12 2-11.    FIREFIGHTING OPERATIONS-Continued (10) Turn the foam metering valve (12) to required foam percentage. (11) Set the foam valve switch (13) to OPEN. (12) While discharging foam, observe the water and foam tank level gages (14 and 15).  Reduce the engine speed to idle before or immediately after the water tank is emptied and shut the pump OFF. CAUTION If  the  engine  water  temperature  exceeds  210  deg.  F  (100  deg  C),  open  COOLER  valve  (9)  until temperature stabilizes. NOTE If the foam tank is emptied, firefighting may be continued using water only.  Set the foam valve and water eductor switches to CLOSED and set the foam proportioning valve to 0. CAUTION When backing off the throttle bring the, engine to an idle, then back the throttle control off an additional  three  turns.    This  will  prevent  the  throttle  control  from  interfering  with  the  governor control  when  in  the  CFR  mode.    Failure  to  adhere  to  this  procedure  will  cause  excessive hydraulic hammering resulting in catastrophic damage to the water delivery system. (13) When the fire is extinguished or the water supply is emptied, throttle the engine back to idle and close all discharge valves. (14) Set the pump switch (5) to OFF. NOTE If the pump cannot be disengaged with the switch, open the manual pump   shutdown valve (16). (15) If required, set the water tank valve switch (4) to OFF (16) If foam has been used, set the foam valve (13) and water eductor switches (10) to CLOSED and turn the foam metering valve (12) to 0. (17) If the hose reel has been used, open the hose nozzle and blow air through the hose to remove residual water.  Rewind the hose (see para. 2-5). (18) Disconnect and store other hoses as applicable and cap all suction and discharge ports. Change 4  2-54

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