FS15-60-120 Rev0204
21
Foam concentrate flow rate greater than 9 GPM:
If there is no output from
the flow sensors a failure in the AutoFoam system is indicated. The upper display will
show an E 2 code when the system is turned off to alert the operator that a failure
occurred. This condition would exist if both foam flow sensors are inoperable because
of some mechanical failure. This could include clogged foam lines or sensors,
disconnected sensor or metering valve cables, open wiring, or no foam in the tank.
When in the fixed program mode stored precalibrated valve position data is used
to adjust the metering valve. There is a transducer in the valve assembly that provides
feedback on the valve position. The valve position is directly related to how much
foam concentrate flows. The program uses the selected foam proportion percent and
the discharge water flow rate to position the valve for the correct foam concentrate rate
of flow.
Manual Mode
When the Manual OVERRIDE OPEN or CLOSE button is pressed and held for
three seconds the system will switch to manual mode. The upper and lower displays
will flash to indicate the system is in the manual mode. The displays will continue to
show correct foam and water flow rates.
When in the manual mode the operator is in control of the amount of foam
concentrate that goes into solution. The OPEN and CLOSE push buttons are used to
control the opening and closing of the metering valve. As the metering valve is opened
or closed the rate of flow of foam concentrate that is injected into solution is changed.
It is up to the operator to monitor the amount of foam in solution at the discharge
and make adjustments manually. The OPEN button will increase the amount foam in
the solution, the CLOSE button will decrease the amount of foam in the solution.
To exit the manual mode the FOAM ON button is pressed to start the automatic
mode or the OFF button is pressed to turn the system off.