DARLEY PuriFIRE VERSA SEA PAK 200 Owner's Manual page 27

ADJUST SHURFLO PRESSURE SWITCH
The ShurFlo feed pumps are equipped with a high pressure cut out switch (part no. EL-FP-PS).
This is the small black unit on the end of the wetted end of the pump head (part no. 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 hydraulic intensifier cycles and the feed pressure spikes. The
points in the switch will fail fairly quickly if set too low because of the constant arcing from
cutting out each time the hydraulic intensifier
shifts. When this happens, the production will drop and an unusual noise will be heard. If the
switch is set too high, pressure inside the membrane could exceed the maximum working pres-
sure, destroying the membrane.
The feed pump pressure switches should be set to shut off at 100 psi (7 bar) as follows: On the
5
very center of the switch is a small / " allen screw. Run the system and block the brine dis-
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charge flow. Watch the pressure gauge and adjust the pressure switch to shut off at 100
psi. Turn the allen screw clockwise to increase the cut off set point.
11/15/05
Adjusting Screw
27