TM-5-4210-249-13-P-1

TACTICAL FIRE FIGHTING TRUCK (TFF) MODEL M1142

TECHNICAL MANUAL; OPERATOR’S AND FIELD LEVEL MAINTENANCE MANUAL WITH REPAIR PARTS AND SPECIAL TOOLS LIST (INCLUDING DEPOT REPAIR PARTS AND SPECIAL TOOLS); PART 1 OF 4

TM-5-4210-249-13-P-1 - Page 204 of 1188

TM 5-4210-249-13&P-1

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DRAFT

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4.

Put FOAM SELECT switch (5) to desired foam agent.

Indicator light A (6) or light B (7) will illuminate.

5.

Make sure correct foam indicator light A (6) or light B (7) is illuminated.

6.

Establish water flow to desired discharge outlet(s) (WP 0028).

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 0.5% at 200 to 210 psi (1,379 to

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 (WP 0024),

depending on type of operation.

NOTE

•

The foam system will discharge class B foam at 3% at 200 to 210 psi (1,379 to 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 to 210 psi (1,379 to 1,448 kPa).

8.

For class B foam, use pressure governor to adjust discharge pressure to 200 to 210 psi (1,379 to 1,448 kPa)

(WP 0024).

END OF TASK

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TFFT02225