PUMP | PRESSURE SWITCH 8
Pump Precautions:
CAUTION “Intermittent Duty” is dened as; operated and/or frequently start-
ed within a period of time that would cause the motor to reach its maximum
thermal limits. Once the maximum thermal limit is obtained, the motor must
be allowed to return to ambient temperature before resuming operation.
DO NOT use to pump ammable liquids. Never operate the pump in
an explosive environment. Arcing from the motor brushes, switch or
excessive heat from an improperly cycled motor may cause an explosion.
DO NOT assume uid compatibility. If the uid is improperly matched
to the pumps’ elastomers, a leak may occur. Pumps used to transfer
hazardous or hot (max. temeperature 170˚F {76˚C} viton only) chemicals
must be in a vented area to guard against the possibility of injury due to
harmful or explosive liquid/vapors.
DO NOT operate the pump at pressures which cause the motor to
exceed the amperes rating indicated on the name plate. Various pump
models are equipped with thermal breakers to interrupt operation due
to excessive heat. Once the temperature of the motor is within proper
limits it will automatically reset and the pump will start operation without
warning.
CAUTION To prevent electrical shock, disconnect power before
initiating any work. In the case of pump failure, the motor housing
and/or pumped uid may carry high voltage to components normally
considered safe.
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
will operate until the shut-off (high) pressure is achieved. The shut-off
pressure is set to factory calibrated standards. See the motor label for
specic pump specications.
CAUTION Improper adjustment of the pressure switch may cause se-
vere overload or premature failure. Failures due to improper adjustment
of the pressure switch will not be covered under the limited warranty.
If the ow rate is very low, the pump may re-pressurize the outlet faster
than the uid is being released, causing rapid cycling (On/Off within
2 seconds). If the pump is subjected to rapid cycling during normal
operation, or for infrequent periods, damage may occur.