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APPENDIX A
TM 07661B-14/1
(a)
Dry Chemical Shut-Off Valve - Closed
(b)
Purge Valve - Closed
(c)
Charge Valve - Open
(d)
Nitrogen Cylinder -Closed
(2)
AFFF System.
(a)
AFFF Shut-OFF Valve - Closed
(b)
Purge Valve - Closed
(c)
Charge Valve - Open
(d)
Nitrogen Cylinder - Closed
b.
Operation. The fire extinguisher as emergency equipment is always maintained in an operational ready
status. When the unit is needed for fighting a fire, proceed as follows:
NOTE
If remote hose reel is needed in reaching the fire, connect the remote unit to the base unit per
paragraph c before opening the nitrogen cylinder valves.
(1)
Open both nitrogen cylinder valves. The AFFF tank will pressurize in 1-2 seconds, the dry chemical
tank should pressurize within 10 seconds.
(2)
Rotate the AFFF control rod and the dry chemical control rod to full open position. The system
discharge lines will pressurize up to the twin nozzle assembly.
(3)
Remove nozzle assembly from nozzle bracket and withdraw all the hose from the reel.
(4)
Approach fire from upwind and attack fire with open dry chemical nozzle, sweeping side to side.
(5)
When headway is gained on fire, open AFFF nozzle.
(6)
Work fire slowly downwind with both nozzles open.
NOTE
Full flow AFFF can be maintained for approximately two minutes. The dry chemical agent will
dispense within approximately 75 seconds at full flow.
(7)
When fire is extinguished, close both nozzles.
(8)
When area clears, verify that no smoldering pockets remain to reignite the fuel.
c.
Operation with Remote Hose Reel. When the remote hose reel is needed to extend the reach of the fire
extinguisher, proceed as follows.
CAUTION
Shut off nitrogen supply and depressurize systems before connecting remote hose reel.
(1)
Extend handline assembly from fire extinguisher hose reel to its maximum length (150 feet).
(2)
Pull the remote hose reel cart to the end of the handline.
(3)
Remove twin nozzle assembly from handline hoses by releasing the quick-disconnects on the nozzle.
(4)
Separate the cart input hoses (5, figure 2-7) by releasing
A 2-14
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