ACTISOL B390100, Operating Manual

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Pressure Switch Operation
The pressure switch reacts to outlet pressure, and interrupts power
at the preset shut-off pressure indicated on the pump label. When
outlet pressure drops below a predetermined limit (*typically 15-
20 psi. [1-1.4 bar] less than the shut-off pressure) the switch will
close and the pump operates until the shut-off (high) pressure is
achieved. The shut-off pressure is set to factory calibrated
standards.
Caution:
Improper adjustment of the pressure switch setting may
cause severe overload or premature failure. Refer to the SHURflo
Service Bulletin #1031 for the adjustment procedure. Failures due
to improper adjustment of the pressure switch setting will not be
covered under the limited warranty.
If the plumbing is restrictive or the flow rate is very low, the pump
may re-pressurize the outlet faster than the fluid is being released,
causing rapid cycling (*ON/OFF within 2 sec.). If the pump is
subjected to rapid cycling during normal operation, or for
infrequent periods, damage may occur. Application which exhibit
rapid cycling should have restrictions in the outlet minimized.
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