NPC Betta FLO BMLS-M, Installation, Operation & Maintenance Instructions Manual

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Page 4
Failure to Pump
1. Pump not properly primed.
2. Speed too low.
3. Total head more than that for which pump was
intended.
4. Suction lift too great.
Reduced Capacity and/or Head
1. Air pockets or leaks in suction line.
2. Clogged impeller.
3. Strainer too small, or clogged.
4. Insufficient submergence of suction pipe.
5. Excessive suction lift.
6. Total head more than that for which pump was
intended.
7. Excessively worn impeller and wearing ring.
Pump Loses Prime
1. Air leaks in suction line.
2. Excessive suction lift and operating too near shut-
off point.
3. Water level drops while pumping, uncovering
suction piping.
Mechanical Troubles and Noise
1. Bent shaft and/or damaged bearings.
2. Suction and/or discharge piping not properly
supported and anchored.
1. Make sure pump casing and suction line are full of
water. See Priming Instructions.
2. Check voltage at motor terminals and at meter when
pump is operating. If low, refer to wiring instructions,
or check with your Power Company. Check loose
connections.
3. A pump designed for higher head is needed.
4. Locate pump closer to source of water. Make sure
suction piping is large enough.
1. Check suction piping.
2. Remove and clean.
3. Use larger strainer, or clean.
4. Add lengths of suction pipe to keep submerged and
well below the water surface.
5. If caused by suction pipe friction, enlarge piping.
Otherwise, move pump closer to water level.
6. A pump designed for higher head is needed.
7. Order replacement parts using Repair Parts List in this
manual.
1. Check suction piping.
2. Move pump nearer water level.
3. Check water supply. Add length of pipe to suction to
keep submerged and under water.
1. Take motor to authorized motor repair shop.
2. See that all piping is supported to relieve strain on
pump assembly.
TROUBLE AND CAUSE REMEDY