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Need help?Do you have a question about the Liberty Pumps ProVore PRG Series and is the answer not in the manual?
Installation guide for ProVore 1 HP Residential Grinder Pumps.
Specific models within the PRG-Series.
Explanation of safety alert symbols and warnings.
Procedure to verify cutter and impeller spin freely.
Illustration of a typical indoor pump installation.
Matrix of common problems and their solutions.
The Liberty Pumps ProVore® 1 HP Residential Grinder Pump (PRG-Series) is a robust and reliable device designed for continuous underwater operation, specifically for handling septic tank effluent, sewage, and drain (storm) water in residential applications. This pump is a crucial component in wastewater management systems, ensuring efficient and clog-free operation by grinding solids and fibrous matter into small particles that can be safely pumped through small diameter piping.
The primary function of the ProVore® grinder pump is to process wastewater containing solids and fibrous materials, reducing them to a slurry that can be easily transported through smaller discharge lines. This grinding capability prevents clogs and ensures the smooth operation of the wastewater system. The pump features a close-coupled, watertight unit with an induction motor, insulated against heat and moisture, and protected by a mechanical type cartridge seal with two silicon carbide faces. The impeller and volute are specifically designed for efficient flow characteristics, further contributing to its clog-free performance.
The PRG-Series pumps are available in two main configurations: automatic models and switchless (manual) models. Automatic models come factory-equipped with a float switch mounted to the pump, featuring two cords—one for the float switch and one for the pump motor. The float switch cord has a piggyback plug, allowing the pump motor cord to be plugged into it. This design facilitates temporary manual operation of the pump, which can be controlled via the circuit breaker. In the event of switch failure, the pump cord can be separated and plugged directly into the electrical outlet, bypassing the switch. The turn ON and OFF levels for automatic models are pre-set, but can be adjusted by tethering the switch cord to the discharge pipe, ensuring the impeller remains submerged when the pump shuts off. Vertical switch models have pre-set pumping differentials adjusted by a rubber stopper on the float rod.
Switchless (manual) models, designated with an "M" suffix, do not include a float switch and are intended to be operated using an approved liquid level control or motor control panel. These panels must have the correct rating to match the motor input in full load amperes. For both types, a thermal overload (thermostat) is integrally mounted to the motor to shut down the pump if overheating occurs, resetting automatically once the pump has cooled.
The ProVore® grinder pump is designed for straightforward installation and reliable long-term use, provided the instructions are followed carefully. Before installation, it is essential to ensure the pump is correctly sized for the intended application, with its operating point falling within the acceptable range outlined by Liberty Pumps' performance charts. Operating outside this range can lead to reduced efficiency, premature failure, and voided certifications.
For new installations, proper basin excavation and backfill are critical. The basin should be sealed and vented according to health and plumbing codes, with recommended minimum dimensions. Fine pea gravel or crushed stone should be used for bedding and backfill to provide a stable, level base and support the tank, avoiding sand or native soil. Inlet connections should be made securely, with Liberty Pumps basins often featuring molded inlets for no-hub couplings or caulking hubs/pipe grommets.
Electrical connections must be performed by qualified personnel in accordance with the National Electrical Code® and local ordinances. For automatic models, the piggyback plug system simplifies connection, while manual models or direct-wired automatic pumps require careful wiring into a control device or junction box. A double pole disconnect is recommended for 208/230V installations to ensure safety.
A critical pre-operation step is the "Cutter and Impeller Free Movement Check." Before connecting power, the cutter on the bottom of the pump must be manually rotated to ensure it spins freely. This not only verifies proper function but also lubricates the shaft seals, especially if the pump has been idle.
Once installed and wired, the system requires verification of all plumbing components, valve positions, and wire connections. Running several cycles of water through the system is recommended to confirm correct control operation, especially for systems with multiple pumps or custom configurations.
The ProVore® grinder pump is designed for minimal maintenance, primarily focusing on periodic checks and proper storage. Quarterly checks for corrosion and wear are recommended. The motor is oil-filled and does not require lubrication; it is permanently lubricated and cooled by turbine oil. If replacement oil is ever needed, specific types and quantities are specified.
Troubleshooting guidance is provided to address common issues such as the pump not starting, running continuously, or failing to deliver proper capacity. These issues can stem from various causes, including damaged cords, float switch malfunctions, tripped circuit breakers, improper voltage, or obstructions. The manual provides corrective actions for each scenario, emphasizing the importance of disconnecting power before any adjustments.
For pumps in storage, it is crucial to keep them in their shipping container in a clean, dry, temperature-stable environment, protected from moisture, dirt, and vibration. Uninstalled pumps idle for more than three months should have their cutters and impellers manually rotated monthly to lubricate the seals. For installed automatic models that are idle for over a month, the breaker should be turned off, the piggyback switch unplugged, and the pump plugged directly into the receptacle for 30 seconds to operate and lubricate the seals, then reconnected.
Any repair work during the warranty period must be authorized by Liberty Pumps to avoid voiding the warranty. Disassembly in the field, except by Liberty Pumps or its authorized service centers, automatically voids the warranty. This ensures that any necessary repairs are performed by qualified technicians using appropriate parts and procedures, maintaining the pump's integrity and performance. The pump's design, with its robust construction and self-resetting thermal overload, contributes to its overall low-maintenance profile, making it a reliable choice for residential wastewater applications.
General| Material | Cast Iron |
|---|---|
| Motor Housing Material | Cast Iron |
| Impeller Material | Cast Iron |
| Seal Type | Mechanical Seal |
| Type | Grinder Pump |
| Voltage | 115V / 230V |
| Phase | Single |
| Cord Length | 10 ft or 25 ft (depending on model) |
| Application | Residential |
| Series | ProVore PRG |
| Horsepower | 1 HP |
