Pentair STA-RITE MS Series

Questions and Answers

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Christopher CollierAug 10, 2025
How to fix a Pentair Water Pump motor that will not run?
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  Jason KingAug 10, 2025
  If your Pentair Water Pump motor won't run, first ensure the switch is on. Replace the fuse or reset the circuit breaker. If that doesn't work, disconnect the power and replace the starting switch, referring to the wiring instructions. Also, disconnect the power, then check and tighten all wiring connections. Be cautious of capacitor voltage and discharge the capacitor with an insulated screwdriver if necessary. If unsure, consult an electrician. Lastly, disconnect the power and file the contacts with an emery board or nail file.
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Lisa LucasAug 15, 2025
What to do if Pentair STA-RITE MS does not deliver water to full capacity?
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  Daniel DavisAug 15, 2025
  If your Pentair Water Pump isn't delivering water to its full capacity, it could be due to a few reasons. If the water level in your well is lower than expected (more than 25 feet), you might need a deep well jet. Corroded or limed steel piping can also cause excess friction, so replace it with plastic pipe if possible, or new steel pipe. Additionally, ensure that any offset piping is adequately sized; if it's too small, use larger piping.
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Kathryn MarquezAug 20, 2025
Why does my Pentair STA-RITE MS keep cycling on and off?
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  rmitchellAug 20, 2025
  If your Pentair Water Pump cycles too frequently or doesn't shut off, try these steps: First, disconnect the power and adjust or replace the pressure switch. Ensure all faucets are closed. Then, clean the venturi, nozzle, or impeller. Consider whether a deep well jet pump might be more suitable for your situation. Drain the tank to the air volume control port and inspect the AVC for any defects. Check all connections for air leaks. Also, inspect and potentially replace the foot valve. Finally, disconnect the power, relieve the pressure, and check the air pressure in the tank using a tire pressure gauge. If it's below the cut-in setting (30-50 PSI), add air until it's 2 PSI less than the cut-in setting. Check the air valve for leaks with soapy water and replace the core if needed.
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David AcostaAug 26, 2025
Why does Pentair STA-RITE MS motor run hot and overload kicks off?
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  michael02Aug 26, 2025
  If your Pentair Water Pump motor runs hot and the overload kicks off, refer to the wiring instructions. Check with your power company and, if necessary, install heavier wiring if the current wire size is too small according to the electrical/wiring chart. Also, review the section on too frequent cycling, as this can contribute to overheating.
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Jordan HubbardAug 30, 2025
Why air spurts from faucets with Pentair Water Pump?
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  christinawardAug 30, 2025
  If you're experiencing air spurts from your faucets while using your Pentair Water Pump, it indicates that the pump is drawing air. When the pump has properly primed, it should pump solid water without any air. Check the suction pipe joints for leaks using soapy water. If the issue persists, consult the factory about installing a sleeve in the well. If possible, lower the foot valve; otherwise, restrict the pump discharge.
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Steve JohnsonNov 4, 2025
What to do if Pentair STA-RITE MS runs but no water is delivered?
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  Kevin MarshallNov 4, 2025
  If your Pentair Water Pump runs but doesn't deliver water, the issue could stem from several causes. If it's a new installation, ensure proper priming and check for air leaks in the suction line, AVC, and ejector using soapy water. A leaking foot valve or check valve could also be the culprit, so consider replacing them. For pumps already in use, air leaks in the suction line or a water level below the suction pipe inlet might be the problem. Lower the suction line into the water and re-prime. If the water level exceeds 25 feet, a deep well pump may be necessary. Also, check for blockages by cleaning the foot valve, strainer, ejector, or impeller. A stuck check valve or foot valve should be replaced, and frozen pipes need thawing. If the foot valve or strainer is buried, raise them or clea...

Summary

Safety Instructions and Warnings

Electrical Safety

Covers electrical hazards, capacitor warnings, and proper grounding procedures for safe operation.

General Safety Guidelines

Provides essential safety guidelines for operating and maintaining the pump, including handling hot motors and preventing freezing.

Pump Installation Preparation

Before You Install Your Pump

Key preparatory steps and considerations before installing the pump, including well matching and pipe preparation.

Shallow Well;Centrifugal Installation

Guidance for installing pumps in shallow wells, including specific instructions for centrifugal setups and depth limitations.

Deep Well Piping and Installation

Piping in the Deep Well

Details on deep well installations, distinguishing between single and double pipe systems and plastic pipe suitability.

Plastic Pipe Installation - Double Pipe

Step-by-step guide for installing plastic piping in double pipe deep well systems, focusing on leak prevention.

Deep Well Installation Techniques

Single Pipe Ejector Installation

Instructions for installing single pipe ejector systems, including pipe connection, depth setting, and casing adapter fitting.

Discharge Pipe Sizes

Recommendations for selecting appropriate discharge pipe sizes based on run length to minimize friction and pressure loss.

Pressure Tank Installation

Pressure Tank Installation - Deep Well

Explains the function of pressure tanks in deep well systems for maintaining pressure and cushioning against hammering.

Standard Tank Connection

Describes connecting a standard tank with an air volume control (AVC) to the pump system for air regulation.

Precharged Tank Connection

Details on connecting a precharged tank, noting the absence of AVC and specifying required pre-charge pressure for operation.

Electrical Wiring and Connections

Voltage Conversion

Instructions for converting the motor between 230V and 115V, with diagrams for terminal board and plug adjustments.

Wiring Connections and Safety

Essential guidelines for safe wiring, including voltage limits, grounding, and compliance with electrical codes.

Electrical Wiring Procedures

Connection Procedure

Step-by-step guide for connecting ground and power supply wires, emphasizing proper grounding and metal connections.

Wiring Chart

Table detailing recommended wire and fuse sizes based on motor horsepower, voltage, and distance from the meter.

Pump Operation and Priming

Priming the Pump

Detailed steps for priming the pump, including filling with water, starting, and troubleshooting common issues like loss of prime.

Advanced Operation Scenarios

Handling Gaseous Wells

Techniques for dealing with wells containing gases, ensuring delivery of gas-free water by venting and pipe placement.

Air Control in Flowing Wells

Addressing air control issues in flowing wells or those with minimal drawdown, recommending pre-charged tanks.

Pump Maintenance Procedures

Pump Disassembly and Assembly

Step-by-step guide for taking apart and reassembling the pump, including component removal and alignment marks.

Installation of New Seal

Instructions for cleaning and installing a new shaft seal, ensuring proper seating and alignment of components.

Pump Reassembly Details

Shaft Seal and Impeller Installation

Guidance on installing the shaft seal, spring holder, impellers, and ensuring proper alignment and tightening during reassembly.

Troubleshooting Pump Issues

Pump Repair Parts and Kits

Repair Parts - Multi-Stage Jet

Comprehensive list of pump components with part numbers, quantities, and compatibility across different horsepower models.

Service Kits

Available service kits for pump maintenance, including seal and gasket kits, and overhaul kits.

Specific Component Parts

Pressure Regulator Parts

Detailed breakdown of components for the pressure regulator assembly with part numbers and quantities.

Adapter Flange Parts

List of parts for adapter flanges, including gaskets and capscrews, specified for different pipe sizes.

Casing Adapter Parts

Components for casing adapters, such as gaskets, adapter bodies, and seal rings, with part numbers.

Pentair STA-RITE MS Series Specifications

General

Model	STA-RITE MS Series
Category	Water Pump
Motor Type	TEFC (Totally Enclosed Fan Cooled)
Weight	Varies by model
Voltage	115/230V
Wet End Material	thermoplastic
Seal Type	Mechanical seal
Housing Material	thermoplastic
Impeller Material	thermoplastic
Inlet/Outlet Size	1.5 to 2 inches
Port Size	1.5 to 2 inches