Pentair Pentek Series Electronic Manual page 91

SECTION 13: Troubleshooting
Pump And Motor Problem Analysis (Continued)
Problem Possible Cause
Lo w or no water Well drawdown.
production
(continued)
Well collapsed.
Pump selection.
Hole in well piping.
Wrong rotation.
Improper sizing.
Ho le in distribution
Pu mp runs all the Drawdown.
time.
Control equipment.
90
Check And Restore
1. Install air line upon reinstalling unit if not already present for
measuring depth with tire pump and gage.
2. Measure dynamic (drawdown) level with string or resistance
meter.
3. Select different pump if appropriate.
1. Unit is pumping dirty or sandy water.
2. Lift with pump hoist, check pull weight and resistance
1. Recheck operating conditions by comparing to pump curve.
2. Operate within ±5 percentage points of efficiency from B.E.P.
1. Listen for sucking sound at well head when pump shuts off.
2. Well pipe empties when submersible pump is pulled from well.
1. Three phase motor - exchange any two of the three leads in the
three phase motor starter panel.
2. Single phase motor - recheck motor and control panel wiring
diagrams. Change wiring as appropriate.
3. Proper rotation for motors for sub. and centrifugal pumps with
CW rotation is CCW when looking at the shaft end of the motor.
4. Make a visual flow check or observe flow meter. Amperage is not
a reliable indicator of wrong rotation.
Consult manufacturer's performance charts or curves.
1. Observe pressure loss with system shut off.
piping.
2. Look for wet spot or depression along pipe path.
1. Check for surging, irregular amperage readings with amprobe.
2. Look for bursts of air in water.
3. Listen for surging sounds in piping.
1. Control equipment incorrectly selected or installed.
2. Welded electrical contact points.
3. Pressure switch supply pipe/tube plugged with rust/scale/ice.
scalding. If pump is running continuously at no flow (with discharge
shut off), water may boil in pump and piping system. Under steam
pressure, pipes may rupture, blow off of fittings or blow out of pump
ports and scald anyone near.
Hazardous pressure and risk of explosion and