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TM 07661B-14/1
APPENDIX A
a.
Dry Chemical Tank. The dry chemical tank is filled with 450 pounds of powdered potassium bicarbonate (Purple
K) prior to shipment. Remove the fill cap (1, figure 1-7), take a handful of powder and check to see that it crumbles
easily and pours freely between spread fingers. This action is to assure powder has not become wet and caked. If
caked, replace powder according to paragraph 3-10a.
b.
AFFF Tank. Service the AFFF tank as follows: NOTE AFFF water mixture is subject to freezing. If 'freezing
weather conditions exist do not service the AFFF tank until the heater receptacle is installed and adequate power is
available.
(1)
Remove AFFF fill cap (2, figure 1-7).
(2)
Pour the six gallons of AFFF concentrate supplied with fire extinguisher into tank. AFFF concentrate will
freeze, but the plastic container(s) used for shipment will expand safely with the ice. The AFFF can be used satisfactorily
after it thaws out.
(3)
Fill tank to within 4-1/2 inches of top of fill collar with water. Although not absolutely necessary, use of a
hose, held against the bottom of the tank while filling, will assure more complete mixing of the solution, while retarding
foaming action. Any further stirring of the solution after initial filling is not required.
(4)
Ensure that fill cap gasket is in place, replace fill cap and tighten hand tight.
(5)
If freezing weather exists, or is imminent, connect power source to AFFF heater.
c.
Nitrogen Cylinders.
WARNING
The nitrogen cylinders are originally charged with 2400 psig pressure. Use caution when
performing any of the following steps where personnel may be exposed to cylinder pressure.
Connect nitrogen cylinders (3, figure 1-2) to respective chemical tank as follows (figure 1-7):
(1)
Remove by unscrewing the cylinder shipping caps. Store the shipping caps for reshipping purposes or for
transporting cylinder for recharge.
(2)
Rotate each nitrogen cylinder until the pressure gage (4, figure 1-7) is straight up.
(3)
Connect the swivel nut from the dry chemical regulator hose (5, figure 1-7) to the left nitrogen cylinder,
tighten securely with a wrench.
(4)
Connect the swivel nut from the AFFF regulator hose (6, figure 1-7) to the right nitrogen cylinder, tighten
securely with a wrench.
d.
Position of Extinguisher Controls. Controls. Leaving the nitrogen cylinder valve closed, check that the rest of
the extinguisher controls are in the following
A 1-19
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