Xylem AquaBoost CS and VS Pumping Packages - Manual (Page 43)

Cause Remedy
The transducer isolation valves are closed. Check to be sure that the transducer isolation valves are
in the open position.
The NPSH is insufficient. Check the NPSH. Are proper flooded conditions or
positive pressure being delivered to the pump station?
Check for air in the supply lines. Check for properly filled
supply tanks (if applicable). Excessive suction lift or
piping losses will limit the life expectancy of the pumps.
The pump station has lost its prime. Check to be sure that the pump station has been primed
properly. Make sure that all pumps and components are
properly filled with water.
The pump rotation is incorrect. Check the pump rotation. Proper rotation is indicated on
the pump volute. (See the pump IOM.)
A suction or discharge valve is closed or clogged. Check the isolation valves and check valves. Are all
suction/discharge valves open? Could any valves be
plugged? Could the pumps be plugged?
The motor is not operating at the rated RPM. Check the voltage and amperage. Check for possible
phase loss to the motor.
The impeller is worn or plugged. Take the pump to an authorized pump repair facility.
The pump bearings are worn. Take the pump to an authorized pump repair facility.
The pump station experiences excessive vibration
Cause Remedy
The motor, pump, or piping is loose. Make sure that all fasteners and components are
properly tightened.
Pump station vibration dampers are missing or
improperly installed.
Check for properly installed pump station vibration
dampers.
Pumps are running off their design curve. Check the application. Is the system running in an open
discharge condition (excessive flow rate)? For example, is
the system filling a large irrigation line for the first time
of the season?
Air or gases are present in the pumped liquid. Check water supply lines and tanks. Check for air or gases
in liquid. Bleed the lines.
Discharge piping is plugged. Check discharge piping/valves. Could the piping be
plugged? Could the pump be plugged? Are the isolation
valves open? Clear any clogs.
Supply piping has excessive suction/lift conditions or
friction loss.
Check for excessive suction/lift conditions or friction loss
on supply piping.
The impeller is bound or worn. Take the pump to an authorized pump repair facility.
Pumps and pipes are not properly aligned. Correct the alignment between pumps and pipes.
The pump station does not shut down and no water is used
Cause Remedy
The pump station is in Hand or Manual mode. Put the system in the AUTO position.
The system pressure is set beyond capability of the
station.
Check the system set pressure. Is this duty point beyond
the capability of the pump station?
The RTDs are incorrectly installed. Check to make sure that the RTDs are installed correctly.
(CS only)
There are leaks or broken pipes. Check for broken pipes or leaks. Does the system
pressure decrease if the pump station is turned off?
Troubleshooting
AquaBoost CS and VS Pumping Packages Installation, Operation, and Maintenance Manual 41