TEST OR INSPECTION
Do not mix different types or brands of foam agent in foam cells or piping. Mixing
of different foam agents (either type or manufacturer) may cause deterioration of
foam agent, improper proportioning and poor performance in a fire situation.
Mixing of Class A and Class B foam agents may result in a chemical reaction which
can create globules, which can clog orifices and cause system failure.
Failure to flush foam system after each foam use could result in equipment damage.
Do not open foam agent supply tanks while performing flush procedures.
Before flushing system make sure that FOAM SYSTEM switch is in off
Start water pump engine (WP 0022). Put pump operator's panel FOAM FLUSH switch
FOAM FLUSH switch to OFF position (WP 0004). Put cab FOAM SYSTEM switch to
TANK TO PUMP switch to ON position (WP 0004). Put GROUND SWEEPS switch to
selected. Check if foam is delivered from under truck nozzles in either foam A or foam
If foam is delivered from ground sweeps, fault corrected.
If foam is not delivered from ground sweeps, replace foam system
multi-metering valve (WP 0292).