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Grundfos SP4 - User Manual

Grundfos SP4
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GRUNDFOS INSTRUCTIONS
US Installation and operating instructions
SP4”
4-Inch Stainless Steel
Sub mers ible Pumps
Please leave these instructions with the pump for future reference.
WATER QUALITY
DRINKING WATER
SYSTEM COMPONENTS
ANSI/NSF 61
65 GM
30°C/86°F
PUMP END ONLY

Table of Contents

Questions and Answers

  • K
    Kristin WilliamsAug 11, 2025
    How to fix a Grundfos Water Pump that cycles too often?
    • A
      atkinsonjonathanAug 11, 2025
      If your Grundfos Water Pump cycles too often, it could be due to a defective or improperly adjusted pressure switch, which should be readjusted or replaced. The tank might be too small, requiring replacement with a correctly sized one. Insufficient air charging of the tank or piping leaks should be repaired. A plugged snifter valve or bleed orifice can cause the pressure tank to become waterlogged, necessitating repair or replacement. Leaks in the pressure tank or piping should also be repaired or replaced. Lastly, a defective or improperly set level control should be readjusted or replaced according to the manufacturer’s instructions.
  • J
    Joshua Hughes MDAug 18, 2025
    Why Grundfos SP4 Does Not Produce Enough Flow (GPM)?
    • S
      Stephanie WillisAug 18, 2025
      If your Grundfos Water Pump is not producing enough flow, several factors could be responsible. For 3-phase motors, ensure the shaft is turning in the correct direction by correcting the wiring (for single phase motors, check the wiring diagram; for three phase motors, switch any two power leads). If the pump is operating too slowly, replace defective parts or contact the power company. A stuck or backwards check valve should be re-installed or replaced. Inspect the pump for worn parts or clogged impellers/inlet strainer. If the water level in the well is too low, lower the pump or throttle back the discharge valve. Broken shafts or couplings should be replaced, and any leaks in the fittings or piping should be repaired.
  • E
    Erika LambertNov 3, 2025
    What to do if my Grundfos SP4 Water Pump won’t start?
    • J
      jermaine62Nov 3, 2025
      If your Grundfos Water Pump won't start, it could be due to several reasons. First, ensure there is power at the motor by checking the feeder panel for tripped circuits and resetting them. Blown fuses or tripped circuit breakers can also cause this issue; replace them, but if the problem persists, inspect the electrical installation, motor, and wires for defects. For 3-phase motors, burned or tripped motor starter overloads should be replaced or reset, and the starter should be inspected for damage; also, check the supply voltage and ensure heaters are correctly sized and the trip setting is appropriately adjusted. Defective controls, motors, or cables should be replaced or repaired. For 1-phase motors, a defective capacitor should be replaced. Also, check the pressure switch or its tubing...
  • J
    justinbellNov 25, 2025
    Why do fuses blow or heaters trip in my Grundfos SP4 Water Pump?
    • P
      Paul ColemanNov 25, 2025
      If the fuses blow or heaters trip in your Grundfos Water Pump system, there are several potential causes. Improper voltage could be the issue; if it varies by more than 10%, contact the power company. The starter overloads might be set too low, requiring an increase in heater size or adjustment of the trip setting, without exceeding the recommended rating. For 3-phase motors, an imbalanced three-phase current could be the problem; ensure the current draw on each lead is within 5% of each other, and check the wiring if it is not. Faulty wiring or connections should be addressed by tightening loose terminals and replacing damaged wires. For 1-phase motors, a defective capacitor should be replaced. Ensure the fuse, heater, or starter are the correct size, replacing them as necessary. If the c...

Summary

SAFETY WARNING

Pre-Installation Checklist

Key steps and requirements before installing the pump.

Well Preparation

Steps for preparing the well for pump installation.

Pumped Fluid Requirements

Specifications for the water to be pumped.

Splicing the Motor Cable

Detailed steps for creating a secure motor cable splice.

INSTALLATION PROCEDURES

Attach the Pump to the Motor

Connecting the pump unit to the motor.

Attach the Pump to the Pipe

Connecting the riser pipe to the pump assembly.

Lower the Pump Into the Well

Guidelines for safely descending the pump into the well.

Electrical Connections

Procedures for making correct electrical hookups.

Starting the Pump for the First Time

Step-by-step guide for the first operation after installation.

MOTOR INFORMATION

1-Phase Motor Specifications

Technical details for single-phase motors.

3-Phase Motor Specifications

Technical details for three-phase motors.

Cooling Flow Requirements

Minimum water flow rates for motor cooling.

Motor Jacket;Shroud Configurations

Understanding shroud types for effective motor cooling.

TROUBLESHOOTING

Electrical Measurement and Resistance Checks

Diagnosing issues with supply voltage, current, windings, and insulation.

Pump Start and Flow Problems

Solutions for pumps that won't start or produce insufficient flow.

Overcurrent, Cycling, and Fuse Issues

Troubleshooting blown fuses, tripped breakers, and frequent pump cycling.

LIMITED WARRANTY

Warranty Terms and Service

Details on warranty coverage, exclusions, and how to obtain service.

Grundfos SP4 Specifications

General IconGeneral
SeriesSP
ModelSP4
TypeSubmersible borehole pump
Enclosure Class (IEC 34-5)IP68
Motor ProtectionBuilt-in thermal protection
Protection ClassIP68
Maximum Immersion Depth200 m
Motor Type2-pole
Housing MaterialStainless Steel AISI 304
Shaft MaterialStainless Steel
Liquid Temperature Range0 °C to 60 °C
InstallationVertical
WeightVaries by model
Power0.37-0.75 kW
Motor Power0.37-0.75 kW

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