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Lists features like flexible installation, no filter, self-priming, dry running, and port connections.
Details suction lift, relevant marine standards (ISO, USCG), and EMC compliance.
Visual representation of flow rate versus differential pressure for 12V and 24V.
Guidance on installation, self-priming, mounting, and intermittent duty operation.
Recommends checking electrical connections, protecting motor from corrosion, and removing rust.
Details electrical connections, circuit protection, battery connections, and voltage considerations.
Step-by-step guide on how to rotate the pump head and ports for optimal positioning.
Visual representation of pump components with numbered parts for identification.
Lists the key, description, and quantity of items included in the waste pump service kit.
Provides overall product dimensions in millimeters and inches.
Lists contact details for Xylem Inc. offices in various countries.
The Jabsco 50890 Waste Pump is a robust single diaphragm pump designed for efficient waste management in marine environments. As a product of Xylem, it embodies reliability and practical design, making it a suitable choice for various applications where waste transfer is required.
The primary function of the Jabsco 50890 Waste Pump is to transfer waste liquids. It operates on a diaphragm principle, which allows it to handle fluids with potential solids without the need for a filter, a significant advantage in waste applications. The pump is self-priming, meaning it can draw fluid into its system without external assistance, up to a certain vertical distance. This capability simplifies installation and operation, as it eliminates the need for the pump to be submerged or pre-filled with liquid. The pump is designed for intermittent duty, indicating it should not be run continuously for extended periods, typically not exceeding 30 minutes at a time. This characteristic is common for DC motor-driven pumps in applications where waste transfer is performed in batches rather than as a continuous flow. The pump is available in both 12V and 24V variants, offering flexibility to integrate into different electrical systems commonly found in marine vessels. Its dry running capability is another key feature, meaning the pump can operate without fluid for short periods without sustaining damage, which is beneficial in situations where the fluid source might run dry unexpectedly.
The Jabsco 50890 Waste Pump offers several features that enhance its usability and adaptability in various installations. Its flexible installation options are a major benefit, allowing it to be mounted in different orientations to suit the available space and plumbing layout. The pump utilizes multi-positional ports, which means the inlet and outlet connections can be rotated to achieve the desired hose routing. This flexibility is crucial in confined spaces often found in marine applications. When mounting vertically, it is recommended that the motor be positioned above the pump head to optimize performance and longevity. To minimize noise and vibration, the pump should be installed using the provided rubber grommets, which absorb mechanical vibrations and prevent them from transmitting to the boat's structure.
Plumbing connections are designed for 38mm (1-1/2") ID non-collapsible waste type suction hose. This specific hose type is essential to ensure proper flow and prevent the hose from collapsing under suction, which could impede pump performance. Secure connections are maintained using two stainless steel hose clamps at both the inlet and outlet ends of the pump, ensuring a leak-free and robust system. It is critical that all suction connections are airtight and free from sharp bends or restrictions, as these can significantly reduce the pump's efficiency and priming capability.
For discharge, if the thru-hull fitting is located below the waterline, a vented loop must be incorporated into the discharge hose. This loop should be positioned at least 20cm (8") above the waterline, even at various angles of heel or trim, to prevent siphoning and backflow of water into the vessel. This safety measure is vital for preventing accidental flooding. The pump is explicitly designed for waste applications and should not be used for transferring petrol, petroleum products, or any other liquids with a flash point below 37°C (98°F), as this could lead to an explosion or other severe hazards.
The pump's design, which does not require a filter, simplifies its operation and reduces the need for frequent cleaning or replacement of filter elements, making it more convenient for handling typical waste streams.
Maintaining the Jabsco 50890 Waste Pump involves several straightforward procedures to ensure its continued reliable operation. Regular checks of all electrical connections are crucial, especially in saltwater environments, where corrosion can quickly degrade performance or lead to complete failure. Any signs of corrosion should be addressed promptly, and the motor should be protected with a corrosion-inhibiting spray. If rust is present on the motor, it should be removed, and the motor repainted to prevent further deterioration.
Wiring instructions emphasize making all electrical connections in dry locations. If connections must be made in humid environments, they should be sealed to prevent corrosion, which can lead to poor electrical contact and pump malfunction. The electrical circuit must be protected with a properly rated fuse or circuit breaker, installed as close as possible to the positive (+) lead of the power source. This protects the pump and wiring from overcurrent conditions. The black motor wire should always be connected to the negative (–) battery terminal. Adequate voltage at the motor terminals is essential for optimal performance; voltage should not drop more than 10% below the rated voltage at full load. Insufficient voltage, often caused by partially discharged batteries or undersized cabling, can lead to blown fuses, failure to start, or poor pump performance. If fuses repeatedly fail, it is critical not to install a heavier fuse or bypass the fuse terminals with metal wire, as this can cause overheating of cables and create a fire hazard.
The pump's design allows for easy rotation of both the pump head and the ports, which simplifies maintenance and allows for reorientation if installation requirements change. To rotate the pump head, the end cover is removed, exposing internal bolt heads. After undoing these bolts, the motor unit can be grasped firmly, and the pump head rotated to the desired position. The bolts are then replaced and secured, and the end cover reinstalled. Similarly, the ports can be rotated by undoing a clamp with an allen key, removing the clamp, rotating the port unit to the desired location, and then replacing and tightening the clamp. These rotational capabilities are valuable for adapting the pump to different plumbing configurations or for accessing components during servicing.
Before any disassembly for maintenance or repair, it is recommended to ensure sterilization of the wet end, particularly when dealing with waste pumps, to maintain hygiene and safety. The pump is designed with replaceable components, such as the diaphragm and joker valves, which are included in service kits. This modular design allows for targeted repairs, extending the lifespan of the pump without needing to replace the entire unit. The exploded view and parts list provided in the manual facilitate the identification and ordering of specific replacement parts, making maintenance more efficient.
General| Model | 50890 |
|---|---|
| Type | Flexible Impeller Pump |
| Body Material | Bronze |
| Impeller Material | Nitrile |
| Self-Priming | Yes |
| Housing Material | Bronze |
| Voltage | 12V |
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