Troubleshooting, Continued) – Nova-Tech LMI Series HH Metering Pump User Manual
Apply Teflon tape to NPT threads and tighten piping (see section 6.3).
Replace o-rings. Spare Parts (SP-987).
Consult your local distributor for alternate materials.
Injection pressure cannot exceed pump’s maximum pressure. See
pump data plate.
Replace check valve components. Spare Parts (SP- 987).
Replace plunger seal. Spare Parts (SP- 987).
Check zero on pump/Re-zero pump (see Section 9.0).
Longer piping runs may create frictional losses sufficient to reduce
pump’s pressure rating. Consult factory for more information.
Turn on or plug in pump.
Disassemble pump and measure the resistance of the EPU across the
EPU wires (yellow). For 120v HH pump the coil resistance should be
82 ohm. For 240v HH pump resistance should be should be 330 ohm.
The pulser should be replaced if EPU checks out OK. Consult supplier
Move injection point to a pressurized location or install a back
If pressure at injection point is less than 200 psi (13.8 Bar)a back
pressure valve must be installed.
Replace pulser or resistor. Consult factory.
Piping not sealed.
Worn seal rings.
Solution attacking Liquid Handling
Low Output or Failure
Pump’s maximum pressure rating
to Pump Against
is exceeded by injection pressure.
Worn Check Valves.
Worn Plunger Seal.
Incorrect stroke length.
Piping run on discharge may be too
Failure to Run
Pump not turned on or plugged in.
Excessive Pump Output
Syphoning. (Pumping downhill).
Little or no pressure at injection point.
Excessive strokes per minute.