Johnson Controls TopClean AS - Manual (Page 29)

27 IM-AS/02.00 GB (0412)
14.0 Trouble shooting chart
The pump does not prime
• Air has entered the suction piping; check the seals on the fittings and tighten them
sufficiently.
• Suction pipe not submerged in liquid.
• Clearances between impeller/cover and impeller/body have increased. Check and
correct.
• No liquid in the pump. Introduce liquid.
• Reduce loss of suction head; reduce the suction height.
• Formation of air pockets; eliminate and if necessary fit a valve on discharge.
No flow
• Pump not primed; (see point 8 and previous point).
• Pump turning in wrong direction.
• Suction port obstructed.
• On-off valves closed.
Insufficient flow
• Increased system back pressure on discharge side; increase piping diameter.
• Air entering mechanical seal; check its condition.
• Viscosity of fluid greater than that specified in the order. Contact manufacturer.
• Clearances between impeller/cover and impeller/body have increased. Check and
correct.
Loss of head
• Back pressure on discharge side has fallen; throttle the suction pipe.
• Clearances between impeller/cover and impeller/body have increased. Check and
correct.
Increase in absorbed power
• Flow rate is lower than required.
• Pump is turning at higher speed.
• The impeller does not turn freely. Check it.
• Viscosity and/or specific weight are higher than stated.
• Bearings are not in good condition.
Increase in absorbed current
• The power required has increased (see previous point).
• Main voltage value has fallen.
• There is a fault in the electrical system.