12V Diaphragm Water Pump - PRP-125
6
Operation
Before using the pump, note the following:
•
The pump is not recommended for continuous duty service. Operation at lower pressures and
temperatures, however, will extend the overall service life of the pump.
•
If you are using the pump for non-water liquids/chemicals, the pump should be flushed with clean,
water (if applicable) after each use.
•
To safeguard the pump in extreme cold conditions, any liquids to be pumped should be prepared
using appropriate anti-freeze chemicals. If the pump is not in use, the interior of the pump must be
dry.
•
If the pump is being mounted in an outdoor environment, it should be protected from water or other
liquids, dust and direct sunlight.
•
Do not assume the pump is compatible with any chemical. If the chemical is not compatible with the
pump materials (diaphragm rubber etc.), the pump may fail to prime, have low pressure or the
pressure switch may not shut off.
•
The pump is self-priming, however, priming may be required depending on the fluid viscosity,
suction tube size, foot valve and pump configuration.
Start-Up
To start and prime the pump, the outlet line must be open, allowing any in the pump to escape. This is
to avoid the possibility of airlock. The pressure switch will shut-off the pump automatically when the
discharge valve is closed and the pressure has risen to the OFF switch set point. The pressure switch
will restart the pump when a valve is opened and the discharge line pressure drops to the ON switch
set point of the pressure switch.
Demand Operation (Intermittent Duty)
The “demand operation” function is considered an “intermittent duty” application. The maximum
intermittent duty cycle is what causes the motor to reach its maximum thermal limits. Once the
maximum thermal limit has been reached, the motor must be allowed to settle to a lower temperature
(ambient temperature being ideal) before resuming operation. Running the pump at or near the
maximum thermal limit for extended periods of time will shorten the life of the pump and may result in
immediate pump failure.
Bypass Operation (If Equipped)
Models equipped with an external bypass system are designed to pump at high pressures while
operating at low or high flow rates. Models equipped with a bypass system only will continue to run until
the power is manually turned off.
