Zoeller zoeller-m53 Sump Pump 1/3 Hp Cast Iron

Product Description

The ZOELLER zoeller-m53 is a 1/3 HP submersible sump pump built for residential and light commercial water removal applications. The motor and pump housing are cast iron, and the base is engineered thermoplastic. A float-operated, 2-pole mechanical switch controls automatic operation. The unit ships with an oil-filled, hermetically sealed motor with automatic reset thermal overload protection, a carbon and ceramic shaft seal, and sleeve bearings that run in an oil bath. The entire pump is pressure-tested after assembly and carries a corrosion-resistant, powder-coated epoxy finish with no sheet metal parts that can rust.

The zoeller-m53 is suited for sump pit applications in residential basements and crawl spaces as well as light commercial dewatering and effluent transfer where solids passage is a factor. The float switch activates the pump at a pit depth of 7.25 inches and shuts it off at 3 inches, making it compatible with standard variable-level, long-cycle control systems. The 1.5-inch NPT discharge connects to standard schedule 40 or schedule 80 PVC discharge piping commonly used in these installations.

Key Features

• Cast iron motor housing, switch case, and pump housing for durability and heat dissipation
• Oil-filled, hermetically sealed motor with automatic reset thermal overload protection
• Float-operated 2-pole mechanical switch with 7.25-inch on point and 3-inch off point
• Passes solids up to 0.5 inches spherical — no screens to clog
• Stainless steel screws, switch arm, guard, and handle resist corrosion
• Watertight and dust-tight construction with neoprene square ring seal between motor and pump housing
• Maximum liquid temperature: 130 degrees F for effluent or dewatering service

Compatibility

Designed as an OEM-style submersible sump pump replacement suitable for standard residential and light commercial sump pit installations using a 1.5-inch NPT discharge connection.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and the IPC. Disconnect all power to the circuit before lowering the pump into the sump pit or servicing any components. The 1.5-inch NPT discharge outlet should be connected using appropriate fittings and a check valve to prevent backflow when the pump cycles off. Verify pit diameter and depth accommodate the pump dimensions before installation.

Technical Specifications

• Horsepower: 1/3 HP
• Discharge Size: 1.5 inches NPT
• Switch On Point: 7.25 inches
• Switch Off Point: 3 inches
• Maximum Liquid Temperature: 130 degrees F
• Solids Passage: 0.5 inches spherical
• Major Width: 10.09 inches
• Major Height: 10.06 inches
• Motor Housing Material: Cast Iron
• Base Material: Engineered Thermoplastic
• Impeller Material: Glass-Filled Plastic with Metal Insert
• Shaft Seal: Carbon and Ceramic
• Switch Type: Float-Operated 2-Pole Mechanical
• Motor Type: Oil-Filled Hermetically Sealed with Automatic Reset Thermal Overload
• Finish: Powder-Coated Epoxy

Standard Information

• Brand: ZOELLER
• Manufacturer Part Number: zoeller-m53