FS15-60-120 Rev0204
31
MAINTENANCE
Flushing the System
It is recommended that the system should be flushed after each use to remove the
foam from the flow sensors, metering valve, and plumbing. Make sure that the valve
to the foam tank is closed when flushing the metering valve so that no water gets into
the foam tank.
The metering valve must be flushed periodically to prevent clogging and to ensure
sufficient lubrication for the foam flow sensors.
1. Ensure that the pump intake and discharge pressures will be within minimum
requirements. (Refer to Table 1.)
2. Ensure that the bypass and foam isolating valves are closed. Open the flush
valve and the eductor water valve if installed.
3. Press FOAM ON button.
4. Pump water.
5. Press and hold Manual OVERRIDE OPEN button. Run the metering valve to
the fully open position.
6. Press the OFF button when the system is flushed out.
Cleaning the Paddlewheel Sensors
The paddlewheel type flow sensors need to spin freely to generate flow data.
Should they ever get clogged and stuck, they can be removed for cleaning. Remove
the retainer cap which holds the paddlewheel sensor in the housing.
Use plain water to clean the paddlewheel sensors. Do not use solvents.
Be careful when reinstalling the paddlewheel sensor. The paddlewheel will only
seat properly when in the correct orientation. (Refer to Install Flow Sensor.)