Century B2859 2HP 56Y Square Flange Up-Rated Pool Motor 115/230V

The Century B2859 2 HP Up-Rated Square Flange Pool Pump Motor is a dual-voltage (115/230V) OEM-grade replacement motor built for in-ground pool and spa pumps. The 56Y square flange frame and threaded stainless steel shaft make it a direct bolt-on fit for a wide range of premium pump housings, including Pentair WhisperFlo, Challenger, Sta-Rite Max-E-Glas, and Jandy PlusHP.

🚩 PRO TIP

The B2859 ships wired for 230V by default. If your system runs on 115V, follow the wiring diagram on the motor nameplate to reconfigure before installation. Always replace the shaft seal at the same time — it's inexpensive insurance against a costly motor failure down the road.

PRODUCT FEATURES

• 2 HP Up-Rated (2.2 THP with 1.10 service factor)
• Dual voltage: 115V or 230V — field-selectable
• 56Y square flange frame for direct bolt-on replacement
• Single speed, 3450 RPM
• Threaded stainless steel shaft
• Open Drip-Proof (ODP) enclosure
• Switchless permanent split capacitor design
• Fits Pentair, Sta-Rite, Jandy, Waterway, and more
• 1-Year manufacturer warranty

TECHNICAL SPECIFICATIONS

• Model / Part Number: B2859 (replaces B859)
• Brand: Century (A.O. Smith / Regal Beloit)
• UPC: 786674012319
• Horsepower: 2.0 HP Up-Rated (2.2 THP)
• Service Factor: 1.10
• Voltage: 115/230V Dual Voltage
• Amperage: 10.5/21.0 A
• Speed: Single Speed, 3450 RPM
• Frame: 56Y Square Flange
• Shaft: Threaded, Stainless Steel, 5/8" diameter
• Enclosure: Open Drip-Proof (ODP)
• Phase: Single Phase
• Frequency: 60 Hz
• Dimensions: 14" L × 8" W × 6.5" D
• Cross-References: B859, 177476, 177217, 193987, SP3215Z1M, SPX3215Z1MR, EB859, EUSQ1202
• Compatible Pumps: Pentair WhisperFlo WF-28, Challenger CFII-N1-2A, Sta-Rite Max-E-Glas/Dura-Glas, Jandy PlusHP PHPM2.0
• Note: Not compliant with CA/NY Title 20 energy efficiency regulations
• Warranty: 1 Year

Frequently Asked Questions

• What pool pumps are compatible with the Century B2859 motor? This 56Y square flange motor is a direct bolt-on replacement for several premium pump housings, including the Pentair WhisperFlo (WF-28), Pentair Challenger (CFII-N1-2A), Sta-Rite Max-E-Glas / Dura-Glas, and the Jandy PlusHP (PHPM2.0).
• Can this motor be wired for 115V or 230V? Yes, the B2859 is a dual-voltage motor. However, it ships wired for 230V by default. If your pool equipment pad runs on 115V, you must reconfigure the voltage terminal connections using the wiring diagram on the motor's nameplate prior to applying power.
• Does this motor replace the Century B859? Yes, the B2859 is the direct operational and physical replacement model for the older Century/A.O. Smith B859 motor.
• Should I replace the pump seal when installing this new motor? Yes. It is highly recommended to install a new shaft seal and wet-end O-rings during installation. Reusing an old seal is the leading cause of premature motor failure due to water leaking down the shaft into the front bearing. (Note: The replacement seal kit depends on your specific pump housing model, not this motor).
• Can this motor be shipped to California or New York? No. The Century B2859 is a single-speed pool motor and does not comply with California Title 20 or New York energy efficiency regulations for residential filtration pumps. It cannot be sold or shipped to addresses in CA or NY.

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