521-OM0108.88
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2009 Nalco Company
6-40
Technical Help
(630) 305-CHEM
3D TRASAR
5500 - Installation & Operation Manual
49. Why does my Pellet Feeder ball valve keep jamming with pellets?
This has happened in systems with no, low, or intermittent flow through the pellet feeder. The outlet
line from the pellet feeder should have no blockage. If the flow through the flow switch on the
controller goes below 0.5 gpm, the system will register a no-flow alarm and pellets will stop being
fed. However, if the feeder is plumbed to a separate line that becomes plugged, or if the flow is
throttled to less than 5 gpm but greater than 0.5 gpm, the feeder will continue to feed. This may
result in undissolved pellets below the ball valve. Please check the flow through the feeder prior to
beginning pellet feeding. Strainers before and in the pellet feeder may clog resulting in no-flow or low
flow conditions. A separate flow switch on the feeder line (with a 3 to 5 gpm cut-off) could be added
in series with the controller flow switch if intermittent flow is a problem.
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