Finish Thompson SP10 SERIES SELF-PRIMING User Manual

Page 14

Section Vii - Troubleshooting

General Notes:
• Cold water can contain dissolved air. Under high lift ap-

plications, the air can come out of solution blocking

suction passages. This can lead to lack of priming, slow

priming, or low flow rates.
• Do not pump liquids containing ferrous metal fines.
• If magnets decouple, stop pump immediately. Operat-

ing the pump with the magnets decoupled will eventu-

ally weaken the magnets.
• Do not use mismatched drive magnet assemblies (dif-

ferent number of magnets on inner and outer drive mag-

net assemblies).
• Contact our Technical Service Department by phone at

800-888-3743 or by e-mail at techservice@finishthomp-

son.com if you have any questions regarding product

operation or repair.
No or Insufficient Discharge
• Air leaks in suction piping
• Housing not filled with priming fluid
• Suction pipe smaller than 1”
• Suction pipe contains high spots causing trapped air

pockets
• Suction pipe excessively long (flow drops as suction

pipe gets longer)
• System head higher than anticipated
• Closed valve
• Viscosity or specific gravity too high
• Motor too large for magnet coupling rating (magnets

uncoupled)
• Clogged suction line, suction strainer (if used), or impel-
ler vanes
Insufficient Pressure
• Air or gas entrained liquid
• Impeller diameter too small
• System head lower than anticipated
• Motors speed insufficient (too low) or motor rotation

incorrect (correct rotation when viewed from the fan end

is clockwise)
Won’t Prime
• Did not fill housing with fluid before initially starting

pump
• Closed discharge valve (valve should be open or open air

vent line)

• Leak in suction piping
• Suction pipe not submerged enough (causing a vortex or

exposing the end of the suction pipe)
• Lift exceeds pump ability (see Capabilities section)
• Suction pipe diameter too large
• Specific gravity or local atmospheric pressure (altitude/

elevation) not accounted for in lift calculations
• Mis-match of inner volute and impeller diameter
• Inner volute o-ring chemically attacked, cut, brittle, etc.
• Motor rotation incorrect (correct rotation when viewed

from the fan end is clockwise)
• Check valve installed too close to the pump
Primes Slowly
• Mismatch of inner volute and impeller diameter
• Suction pipe diameter too large (larger than 1” or 1½”)
• Closed discharge valve (valve should be open)
• Inner volute o-ring chemically attacked, cut, brittle, etc.
Excessive Power Consumption
• Head lower than rating
• Excessive flow
• Specific gravity or viscosity too high
Vibration/Noise
• Loose magnet
• Drive magnet rubbing
• Pump cavitating from improper suction or feed
• Motor or piping not properly secured
• Foreign object in impeller

Section VIII - Warranty

Finish Thompson, Inc (manufacturer) warrants this pump

product to be free of defects in materials and workmanship

for a period of five years from date of purchase by origi-

nal purchaser. If a warranted defect, which is determined

by manufacturer’s inspection, occurs within this period, it

will be repaired or replaced at the manufacturer’s option,

provided (1) the product is submitted with proof of pur-

chase date and (2) transportation charges are prepaid to the

manufacturer. Liability under this warranty is expressly

limited to repairing or replacing the product or parts thereof