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
Pump from onboard water tank (WP 0026). Put personnel cab FOAM SYSTEM switch
to on position (WP 0004). Put personnel cab FOAM SELECT switch to A position
foam is delivered from roof turret in foam B. Flush foam system (WP 0031). Retest
system with foam A selected. Check if foam is delivered from roof turret in foam A.
If foam is delivered from roof turret, fault corrected.
If foam is not delivered from roof turret, replace foam system
multi-metering valve (WP 0292).