1. Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Wilo RS25/6-3P Standard circulation pump. This pump is designed for circulating water in heating systems, particularly for boilers. Please read these instructions carefully before installation and use.
2. Product Overview
The Wilo RS25/6-3P is a robust circulation pump engineered for reliable performance in boiler systems. It features a durable construction and multiple speed settings to optimize energy consumption and heating efficiency.
Figure 1: Front view of the Wilo RS25/6-3P circulation pump, highlighting its technical label. The label indicates key specifications such as Class F insulation, PN10 pressure rating, TF110 fluid temperature, IP44 ingress protection, 2.6µF capacitor, 230V-50Hz power supply, and three speed settings (I: 0.20A/46W, II: 0.30A/67W, III: 0.40A/93W). The model number RS25/6-3P and reference number 4526599 are also visible.
Figure 2: A side view of the Wilo RS25/6-3P pump, illustrating the black motor housing and the threaded connections for pipe installation.
Figure 3: This image provides a rear view of the pump, showcasing the robust pump housing and the threaded inlet/outlet ports.
3. Specifications
| Feature | Specification |
|---|---|
| Brand | WILO |
| Model | RS25/6-3P |
| Voltage | ~230V-50Hz |
| Capacitor | 2.6µF |
| Insulation Class | F |
| Pressure Nominal (PN) | 10 bar |
| Fluid Temperature (TF) | 110°C |
| Ingress Protection (IP) | IP44 |
| Pipe Diameter | 25mm (1") |
| Connection Size | 1" 1/2 (Rp1") |
| Flange Distance | Ø 130mm |
| Dimensions (approx.) | Height: 180mm, Length: 104mm, Base Width: 93.5mm |
| Speed Settings | 3 (I, II, III) |
| Power Consumption (Speed I) | 0.20 A / 46 W |
| Power Consumption (Speed II) | 0.30 A / 67 W |
| Power Consumption (Speed III) | 0.40 A / 93 W |
Figure 4: A technical diagram detailing the dimensions of the Wilo RS25/6-3P pump. Key measurements include a total height of 180mm, a motor housing length of 104mm, a base width of 93.5mm, and a connection size indicated by 'G Rp' with a 33mm offset from the center line. The diagram also notes a flange distance of 130mm for 'Star-RS...-130' models, which is relevant for installation.
4. Setup and Installation
Installation of the Wilo RS25/6-3P circulation pump should only be performed by qualified personnel in accordance with local regulations and safety standards.
4.1. Pre-Installation Checks
- Ensure the power supply matches the pump's requirements (~230V-50Hz).
- Verify that the installation location provides adequate space for the pump and its connections, referring to the dimensional drawing (Figure 4).
- Confirm that the pipe diameter is 25mm (1") and the connection size is 1" 1/2.
4.2. Mounting
- Mount the pump securely in the heating system piping. The flange distance is Ø 130mm.
- Use appropriate nuts for the 1" 1/2 connections to ensure a watertight seal.
- Ensure the pump is installed in a position that allows for proper air venting and easy access for maintenance.
4.3. Electrical Connection
- All electrical work must be carried out by a licensed electrician.
- Connect the pump to a grounded 230V-50Hz power supply.
- Ensure all wiring connections are secure and insulated to prevent electrical hazards.
5. Operating Instructions
The Wilo RS25/6-3P pump features three speed settings to adapt to your heating system's requirements.
5.1. Initial Start-up
- Before starting, ensure the heating system is filled with water and properly vented to remove any air.
- Turn on the power supply to the pump.
5.2. Speed Selection
The pump has a selector (typically a red knob on the motor housing, as seen in Figure 1) to choose between three operating speeds:
- Speed I (Low): 0.20 A / 46 W – Suitable for systems requiring minimal circulation or for energy saving.
- Speed II (Medium): 0.30 A / 67 W – A balanced setting for general heating requirements.
- Speed III (High): 0.40 A / 93 W – For maximum circulation and faster heat distribution.
Select the appropriate speed based on your system's design and heating demand. Adjusting the speed can help optimize comfort and energy efficiency.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your circulation pump.
- Annual Inspection: Have a qualified technician inspect the pump annually for any signs of wear, leaks, or unusual noises.
- System Water Quality: Ensure the heating system water is clean and free from debris or corrosive elements. Poor water quality can lead to pump damage.
- Cleaning: Keep the exterior of the pump clean and free from dust and dirt to ensure proper cooling.
- Venting: Periodically check and vent the heating system to remove any trapped air, which can affect pump performance and cause noise.
7. Troubleshooting
If you encounter issues with your pump, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Pump does not start | No power supply, seized rotor, air in pump | Check power connection and circuit breaker. Attempt to free rotor (if accessible and safe). Vent the system. |
| Pump is noisy | Air in system, cavitation, foreign objects | Vent the system thoroughly. Check system pressure. Inspect for debris. |
| Insufficient circulation | Incorrect speed setting, air in system, clogged pipes/filter | Increase speed setting. Vent the system. Check and clean system filters. |
| Pump is leaking | Loose connections, damaged seals | Tighten pipe connections. Contact a qualified technician for seal replacement. |
If the problem persists after attempting these solutions, please contact a qualified technician or the manufacturer's support.
8. User Tips
- Always ensure the heating system is adequately filled and vented before operating the pump to prevent dry running and airlocks.
- Consider the system's total head and flow requirements when selecting the pump's speed setting for optimal performance and energy efficiency.
- For best results and safety, professional installation by a certified plumber or HVAC technician is highly recommended.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the documentation provided at the time of purchase or contact your authorized Wilo dealer or service center. Keep your purchase receipt as proof of purchase.
