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 TM 9-2320-279-10-3
Operation Under Usual Conditions (Cont)
2-125. FOAM SYSTEM OPERATING PROCEDURES (CAB INSTRUMENT
PANEL) (CONT).
5
4
6
2
3
RADIO1
AUTO
RADIO
TALK
LISTEN
RADIO2
BOTH
INTERCOM
SQUELCH
VOLUME
A
B
01234p
1
(4)
Put FOAM SELECT switch (4) to desired foam agent. Indicator light
A (5) or light B (6) will come on.
(5)
Make sure correct foam indicator light A (5) or light B (6) is
illuminated.
(6)
Establish water flow to desired discharge outlet(s) (para 2-119).
NOTE
Foam system agent percentage is preset for turrets
and ground sweeps and is not adjustable.
The foam system will discharge class A foam at .5% at
200-210 psi (1,379-1,448 kPa). At pressures lower
than 200 psi (1,379 kPa), the foam concentrate will be
higher.
(7)
For class A foam, use pressure governor to adjust discharge pressure to
desired pressure (para 2-115), depending on type of operation.
NOTE
The foam system will discharge class B foam at 3% at
200-210 psi (1,379-1,448 kPa). Class B foam should
not be discharged at reduced pressures.
Activating the PRESET switch on the pressure governor
(pressure mode), will automatically increase the
discharge pressure to 200-210 psi (1,379-1,448 kPa).
(8)
For class B foam, use pressure governor to adjust discharge pressure to
200-210 psi (1,379-1,448 kPa) (para 2-115).
2-162
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