Domestic waterworks with submersible pump 3 - SDM33 with frequency converter - RTS

Product detailed description

Domestic water supply systems with submersible pumps are commonly used in residential, agricultural, and light industrial settings to extract and distribute potable or utility water from underground sources. Installers typically work with deep or narrow boreholes, wells, and cisterns, where reliable pressure control and resistance to abrasive particles are essential. These systems are integrated into water distribution networks, irrigation setups, and fire protection stations. The IBO 3-SDM33 with VESSER frequency converter is designed for such applications, offering continuous operation and precise pressure management.

When installing in deep wells, the system must be compatible with the well casing dimensions and the depth of the water source. The pump is fully submersible and can operate at depths up to 50 m below the water surface. It supports both domestic and commercial use, including irrigation, fire suppression, and pressure boosting in plumbing systems. The modular design allows for easier maintenance compared to monoblock units, as the hydraulic and motor components are separated.

Technical parameters

The maximum flow rate of 70 l/min and head of 117 m determine the pump’s suitability for high-pressure applications such as water distribution in multi-storey buildings or irrigation systems. The 20 m power cable length ensures flexibility in positioning the pump within the well. The 230 V single-phase motor requires standard electrical infrastructure, and the dimensions allow for installation in confined spaces.

Installation and connection

Installation begins with verifying the well or cistern dimensions to ensure the pump fits without obstruction. The pump is lowered using a suitable rope or cable, and the inlet must be positioned just above the base to avoid sediment intake. Connections are made via 1" pipe fittings, requiring compatible reducers or adapters for integration into existing systems. A check valve must be installed downstream to prevent backflow when the pump stops.

Key installation checks include confirming the power supply voltage matches the pump rating, ensuring the frequency converter is correctly configured for the desired pressure range, and verifying the pressure tank is properly sized to reduce pump cycling.

Compatibility and accessories

This system is designed to integrate with standard domestic and agricultural water distribution systems. It requires a pressure tank (8 L included) to stabilise pressure fluctuations and reduce wear on the pump. A pressure switch is not included and must be sourced separately if needed for manual control. The included check valve prevents reverse flow and maintains system pressure between cycles. Additional accessories such as filters or expansion vessels may be required depending on the water quality and system layout.

Technical background for designers

The pump operates using a single-phase induction motor with built-in thermal protection, driving a multi-stage centrifugal impeller. The frequency converter adjusts motor speed to maintain a constant pressure regardless of demand fluctuations. The impellers are floating, allowing them to compensate for wear and misalignment while reducing mechanical stress. The stainless steel construction provides corrosion resistance in aggressive water environments, and the sealed motor housing prevents water ingress. The modular design enables easy replacement of the hydraulic section without removing the entire unit from the well.

System performance is influenced by the water source depth, pipe friction losses, and the presence of suspended solids. The sand resistance feature helps extend service life in environments with high particulate content. For optimal efficiency, the pump should be operated within the recommended flow and pressure range specified in the technical documentation. Long-term reliability depends on regular inspection of the power cable insulation, motor temperature, and impeller condition.

Service and operation

Periodic inspections are recommended to ensure the pump continues to operate efficiently. Key checkpoints include verifying the integrity of the power cable insulation, testing the thermal protection function, and inspecting the impeller for signs of wear or blockage. The frequency converter should be checked for error codes or abnormal readings that indicate electrical issues. No specific service intervals are provided in the brief, but maintenance should be performed as part of routine system checks or following any operational anomalies.

Frequently asked questions

Can the pump be used for fire suppression applications?
Yes, the pump is suitable for small to medium fire suppression systems due to its high head and flow capacity. It should be paired with a dedicated pressure tank and control system for consistent performance.

Is the frequency converter adjustable for different pressure requirements?
Yes, the VESSER frequency converter allows for pressure setting adjustments to match the specific needs of the system. This enables customisation for different building types or water distribution layouts.

Can the pump be installed in a narrow well with a small diameter?
Yes, the compact dimensions make it suitable for narrow wells. Ensure the pump is positioned correctly to avoid contact with the walls and allow for smooth water flow into the inlet.

How is the thermal protection activated during operation?
The thermal protection activates automatically if the motor exceeds safe operating temperatures. This prevents damage from overheating and ensures the pump shuts down safely until it cools down.