Domestic waterworks with submersible pump 3" STM 20 with frequency converter - RTS

Product detailed description

This domestic water supply system with a 3-inch submersible pump STM 20 and frequency converter is designed for installation in residential, agricultural, and commercial buildings requiring reliable and continuous water supply. It is commonly used in deep or narrow wells, boreholes, and reservoirs where stable pressure is essential for domestic or industrial use. The system integrates seamlessly into existing water distribution networks and supports applications such as irrigation, fire protection, and household water supply. It operates efficiently in environments with intermittent or low water levels and is suitable for both temporary and permanent installations.

The system is particularly suited for properties where water sources are located at depths exceeding 8 m and where the pump may be submerged up to 50 m below the surface. Its modular design allows for easy maintenance and replacement of components without requiring complete disassembly. Installers should ensure proper alignment with the water source and system piping to avoid operational issues. The inclusion of protective features ensures safe and efficient operation in variable conditions.

Technical parameters

EAN	8585054501762
Length of supply cable (m)	20
Maximum flow rate (l/min)	100
Pump voltage (V)	230 V
Dimensions H x W x D (cm)	7.5x148
Pump head (m)	77
Weight	16.8 kg
Code	PR_40024

The technical parameters define the system’s performance and compatibility with specific water sources and applications. The 230 V power supply ensures standard electrical integration, while the 20 m cable length provides flexibility in pump placement. The maximum flow rate of 100 l/min and head of 77 m indicate the pump’s ability to handle high-volume water extraction and elevation requirements. The dimensions and weight help determine storage and handling logistics during installation.

Installation and connection

To install the system, begin by verifying the water source depth and pipe alignment to ensure the pump can be fully submerged without obstruction. Connect the pump to the frequency converter using the provided cable and secure the electrical connections in a dry, protected location. The inlet and outlet connections must be checked for compatibility with the existing piping system; standard fittings include a reduced socket and a check valve. Ensure the pressure tank is properly pressurized and connected to maintain stable system pressure. Common installation errors include improper cable routing, which can lead to overheating, and misalignment of the pump with the well casing, which may cause mechanical stress. Always verify the grounding and insulation of electrical components to prevent faults.

Compatibility and accessories

This system is compatible with standard water supply networks and can be integrated with pressure regulators, expansion vessels, and control panels for enhanced functionality. Essential accessories include a pressure tank (8 L with valve), a reduced socket (5/4" x 1"), and a check valve (1"). Additional components such as filters or level sensors may be required depending on the water quality and application. The frequency converter VESSER IQ-E 2.2 kW is included for precise pressure control. When planning the system, ensure all fittings and valves match the pump’s specifications to avoid leaks or inefficiencies.

Technical background for designers

The system operates by using the submersible pump to draw water from the source and deliver it through the distribution network. The frequency converter adjusts the motor speed based on demand, ensuring consistent pressure without sudden load changes. The stainless steel construction and floating impellers enhance resistance to abrasive particles such as sand, prolonging the system’s lifespan. The separation of the hydraulic and motor components allows for easier repairs and maintenance compared to monoblock designs. Designers should consider the total dynamic head, flow rate requirements, and potential abrasion levels in the water to select the appropriate pump configuration. Proper insulation and ventilation around the electrical components are critical for long-term reliability.

Service and operation

Routine checks should include inspecting the cable insulation, verifying the pressure tank’s condition, and monitoring the pump’s operational noise for signs of wear. The thermal protection and overload safeguards reduce the risk of damage during dry running or low water levels. No specific service intervals are provided in the technical data, but regular visual inspections and performance testing are recommended. In case of malfunction, disconnect the power supply and inspect the electrical connections and pump housing for damage. If the issue persists, contact a certified technician for further diagnosis and repair.

Frequently asked questions

Can the pump operate in water sources with high sand content?
Yes, the pump is designed with floating impellers and stainless steel components to resist abrasion from sand and other particles.

Is the system suitable for continuous operation?
Yes, the system is built for uninterrupted use in both residential and professional settings, including irrigation and fire protection applications.

How is the pressure regulated in the system?
The built-in frequency converter adjusts the motor speed to maintain a stable pressure, eliminating the need for mechanical pressure switches.

What is the maximum depth the pump can be submerged?
The pump can be submerged up to 50 m below the water surface, making it suitable for deep wells and large reservoirs.