Grundfos SP 1100S, Installation And Operating Instructions Manual

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Related information
6.7.8 Insulation resistance and ohm value chart
6.7.8 Insulation resistance and ohm value chart
9.3 Checking pump performance
9.3 Checking pump performance
Test the pump performance against its curve based on the
Troubleshooting chart below. Perform the following steps:
1. Install a pressure gauge.
2. Start the pump.
3. Gradually close the outlet valve.
4. Read pressure at shut-off.
5. After reading, open the valve to its previous position.
6. To calculate pump performance, first convert psi reading to feet.
For water: psi x 2.31 = ____ feet.
7. Add this to the total vertical distance from the pressure gauge to
the water level in the well while the pump is running.
8. Refer to the specific pump curve for the shut-off head (pressure)
for that pump model. If the measured head is close to the curve,
the pump is OK.
9.4 Troubleshooting the product
9.4.1 The pump does not run
Cause Remedy
Supply failure. • Connect the power supply.
The fuses are blown. • Replace the fuses.
The motor-protective circuit breaker has tripped. • Reactivate the motor-protective circuit breaker.
The thermal protection has tripped. • Reactivate the thermal protection.
The main contacts in the motor-protective circuit breaker are not
making contact or the coil is faulty. • Replace the contacts or the magnetic coil.
The control circuit is defective. • Repair the control circuit.
The controls are defective. • Replace worn or defective parts.
The motor and/or cable are defective. • If an open motor winding or ground is found, pull the pump from the
well and re-check values at the surface.
• Repair or replace the motor or cable.
The capacitor is defective (single-stage only). • Check the capacitor with an ohmmeter
• If there is no ohmmeter needle movement, replace the capacitor.
9.4.2 The pump runs but does not deliver water
Cause Remedy
The groundwater level in the well is too low. • Lower the pump so the water level is at least 3 feet above the
suction interconnector or install a water level control.
The integral pump check valve is blocked. • Pull the pump from the well.
• Remove the blockage.
• Repair the valve and the valve seat, if necessary, and check for
other damage.
• Rinse out the pump and re-install it.
The inlet strainer is clogged. • Pull the pump from the well.
• Clean the inlet strainer.
• Rinse out the pump and re-install it.
The pump is damaged. • Pull the pump from the well.
• Repair as necessary.
• Rinse out the pump and re-install it.
9.4.3 The pump runs, but at reduced capacity
Cause Remedy
The direction of rotation is wrong (three-phase only). • Correct the wiring and change the leads as required.
The drawdown is larger than anticipated. • Lower the pump so the water level is at least 3 feet above the
suction interconnector or install a water level control.
The outlet piping or the valve are leaking. • Repair the leaks.
The integral pump check valve is blocked. • Pull the pump from the well.
• Remove the blockage.
• Repair the valve and the valve seat, if necessary, and check for
other damage.
• Rinse out the pump and re-install it.
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English (US)