58
ADJUST SHURFLO PRESSURE SWITCH
Shurflo feed pumps are equipped with a high pressure cutout switch (EL-FP-PS). This is the
small black unit on the end of the wet end of the pump head (PL-PMP-SFPH) where the two
red wires connect. If the pressure switch is not properly adjusted the pump may cut out each
time the Clark pump cycles and the feed pressure spikes. When this happens the production
will drop and salinity will increase. The points in the switch will fail quickly if set too low be-
cause of the constant arcing each time the Clark Pump shifts.
On the very center of the switch is a small 5/64” Allen screw. While running the system close
the brine discharge seacock or kink the discharge hose, to block the flow. Watch the pressure
gauge and adjust the pressure switch to shut off at 125 psi. Turn the Allen screw clockwise to
increase the cut off set point.
Pressure Switch
Adjusting Screw
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