STA-RITE DYNA-PRO MPRA Series

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Summary

Safety Instructions

Suction Entrapment Hazard

Critical warning about avoiding pool drains and suction outlets to prevent entrapment.

Entrapment Types and Hazards

Details on limb, hair, body entrapment, evisceration, and mechanical entrapment.

General Safety and VGB Act Compliance

Guidelines for minimizing suction entrapment risks and VGB Act requirements.

Hazardous Pressure Warning

Caution regarding pressurized air during start-up and servicing to prevent separation.

Installation

Pump Mounting and Piping Guidelines

Requirements for pump placement, stability, and suction/discharge pipe connections.

Suction System Requirements

Mandates for suction outlet covers, spacing, and safety compliance for pool use.

Water Velocity and Fittings

Specifications for suction fitting velocity and appropriate pipe fittings.

Electrical

Grounding and Bonding Procedures

Essential steps for safely grounding and bonding the motor and pump system.

Voltage and Wiring Connections

Guidance on matching supply voltage and connecting wires for pump operation.

Operation

Pump Priming Procedure

Instructions on how to fill the pump and system with water to start operation.

Routine Maintenance and Trap Cleaning

Steps for inspecting and cleaning the strainer basket for optimal pump performance.

Storage and Winterizing

Procedures for protecting the pump from freezing and long-term storage.

Pump Service

Pump Disassembly and Seal Removal

Detailed steps for taking the pump apart to remove and replace the shaft seal.

Pump Reassembly and Seal Installation

Instructions for reassembling the pump after seal replacement, including torque specs.

Troubleshooting Guide

Suction and Prime Issues

Diagnosing and resolving problems related to suction leaks and lost prime.

Clogging and Wear Problems

Identifying and fixing issues caused by clogged components or worn parts.

Electrical and Mechanical Issues

Troubleshooting electrical faults, noise, and mechanical problems.

Repair Parts List

Component Identification and Part Numbers

A visual guide with part numbers for ordering replacements for pump components.

Summary

Safety Instructions

Suction Entrapment Hazard

Critical warning about avoiding pool drains and suction outlets to prevent entrapment.

Entrapment Types and Hazards

Details on limb, hair, body entrapment, evisceration, and mechanical entrapment.

General Safety and VGB Act Compliance

Guidelines for minimizing suction entrapment risks and VGB Act requirements.

Hazardous Pressure Warning

Caution regarding pressurized air during start-up and servicing to prevent separation.

Installation

Pump Mounting and Piping Guidelines

Requirements for pump placement, stability, and suction/discharge pipe connections.

Suction System Requirements

Mandates for suction outlet covers, spacing, and safety compliance for pool use.

Water Velocity and Fittings

Specifications for suction fitting velocity and appropriate pipe fittings.

Electrical

Grounding and Bonding Procedures

Essential steps for safely grounding and bonding the motor and pump system.

Voltage and Wiring Connections

Guidance on matching supply voltage and connecting wires for pump operation.

Operation

Pump Priming Procedure

Instructions on how to fill the pump and system with water to start operation.

Routine Maintenance and Trap Cleaning

Steps for inspecting and cleaning the strainer basket for optimal pump performance.

Storage and Winterizing

Procedures for protecting the pump from freezing and long-term storage.

Pump Service

Pump Disassembly and Seal Removal

Detailed steps for taking the pump apart to remove and replace the shaft seal.

Pump Reassembly and Seal Installation

Instructions for reassembling the pump after seal replacement, including torque specs.

Troubleshooting Guide

Suction and Prime Issues

Diagnosing and resolving problems related to suction leaks and lost prime.

Clogging and Wear Problems

Identifying and fixing issues caused by clogged components or worn parts.

Electrical and Mechanical Issues

Troubleshooting electrical faults, noise, and mechanical problems.

Repair Parts List

Component Identification and Part Numbers

A visual guide with part numbers for ordering replacements for pump components.

The provided manual describes the Sta-Rite Dyna-Pro® Centrifugal Pumps with Integral Trap, specifically the MPRA, MPEA, and MPE series, designed for use with swimming pools and spas. This owner's manual covers installation, operation, and parts, emphasizing safety instructions for both single-speed and two-speed models ranging from 1/2 HP to 2-1/2 HP.

Function Description:

The Sta-Rite Dyna-Pro® Centrifugal Pumps are self-priming pumps engineered to circulate water in swimming pools and spas. Their primary function is to draw water from the pool or spa, pass it through a filtration system, and then return the clean water to the pool or spa. The "integral trap" refers to a built-in strainer basket assembly that collects debris such as leaves and hair before they can reach and potentially damage the pump's impeller or the filtration system. This design ensures efficient water circulation and helps maintain water quality. The pumps are designed to be durable and reliable, providing consistent performance for pool and spa owners.

Usage Features:

The Dyna-Pro® pumps are designed for straightforward operation, though proper installation by a qualified pool service professional is crucial for safety and optimal performance.

Self-Priming Capability: The pumps are self-priming, meaning they can automatically draw water into the pump body and begin circulation once the system is filled with water. In flooded suction systems (where the water source is higher than the pump), the pump will prime itself when suction and discharge valves are opened. For non-flooded systems, the trap must be filled with water manually before starting.
Integral Trap: A key feature is the integral trap with a strainer basket. This basket collects debris, preventing it from entering the pump and filter, which protects the pump's internal components and ensures efficient filtration. The trap cover is designed for hand-tightening, making it easy to access the basket for cleaning without the need for tools.
Suction and Discharge Ports: The pump includes clearly marked suction and discharge ports. The discharge port connects to the filter or pool return, while the suction port draws water from the pool or vacuum filters. The port threads are internal 2" NPT for direct pipe connection and external 3-1/4" Buttress for quick disconnect pipe connections using a Sta-Rite Union Collar.
Bonding Lug: An external bonding lug is provided for connecting the pump to the pool structure with a solid copper conductor, ensuring electrical safety by bonding all metal parts of the pool/spa system.
Voltage Compatibility: The pumps are available in single-speed and two-speed configurations, with models supporting 115/230V or 230V operation. Dual-voltage motors feature a plug to change between 230 volts (factory setting) and 115 volts, offering flexibility in electrical hookup.
Safety Warnings: The manual heavily emphasizes safety, particularly regarding suction entrapment hazards. It mandates the use of multiple main drains with approved anti-entrapment suction covers, proper spacing of these covers, and regular inspection for damage. It also highlights the importance of a clearly labeled emergency shut-off switch for the pump.
Pressure Management: Users are instructed to release all pressure from the pump and piping system before servicing, especially when removing the trap cover. This is critical to prevent violent separation of components due to pressurized air.
Piping Recommendations: The manual recommends using at least 2" (51mm) pipe, increasing size for long runs, and supporting both suction and discharge pipes independently to avoid strain on the pump. It also advises sloping the suction pipe slightly upward toward the pump to prevent airlocking.

Maintenance Features:

Routine maintenance is essential for the longevity and efficient operation of the Dyna-Pro® pumps.

Strainer Basket Cleaning: The primary routine maintenance task is inspecting and cleaning the trap basket. Debris accumulation in the basket can restrict water flow, reducing pump efficiency. The manual provides clear steps for cleaning:
1. Stop the pump and close suction/discharge valves.
2. Release all system pressure.
3. Remove the trap cover handle ring by turning it counterclockwise (tapping gently with a rubber mallet if needed).
4. Remove and clean the strainer basket, ensuring all holes are clear.
5. Replace the basket correctly, aligning the large opening with the pipe connection port.
6. Clean and inspect the lid O-Ring, reinstalling it on the trap groove.
7. Clean the O-Ring groove on the trap body and replace the cover and handle ring, tightening hand-tight only.
Seal Plate and Shaft Seal Maintenance: The manual provides detailed instructions for disassembling the pump to inspect and replace the mechanical shaft seal if it is worn or damaged. This involves removing the motor, seal plate, diffuser, and impeller. Special care is advised to avoid scratching the polished surface of the ceramic seat during replacement, as this could lead to leaks.
Winterizing: For areas expecting freezing temperatures or for long-term storage, the pump must be drained to prevent damage. This involves lowering the water level below inlets, removing the trap cover, and draining the tank body through two drain plugs. The use of non-toxic propylene glycol antifreeze is recommended for areas that retain water. The motor should be kept dry and covered, but not with plastic, to avoid condensation/corrosion.
Troubleshooting Guide: A comprehensive troubleshooting guide is included to help diagnose common issues such as failure to pump, reduced capacity, lost prime, electrical problems (e.g., running too slowly, overheating), and mechanical noises. It provides steps to check for suction leaks, clogged components, and proper electrical connections.
Parts List: The manual includes a detailed repair parts list with exploded diagrams, model numbers, and corresponding part numbers for various components, facilitating easy identification and ordering of genuine Sta-Rite factory parts for repairs.
Electrical Inspection: Regular inspection of electrical wiring for damage or deterioration is recommended, especially after a shutdown period. Any repairs should be performed by a qualified serviceman.
Pressure Gauge Monitoring: Users are advised to note the filter pressure before servicing and to observe the filter pressure gauge during startup to ensure it does not exceed pre-service conditions. This helps identify potential issues within the circulation system.

STA-RITE DYNA-PRO MPRA Series Specifications

General

Model	DYNA-PRO MPRA Series
Category	Water Pump
Type	Centrifugal Pump
Voltage	115/230V
Phase	Single Phase
Material	thermoplastic
Port Size	2 inch
Inlet Size	2 inch
Outlet Size	2 inch