1. Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Wilo SUB TWU 4 submersible pump, model TWU4-0409-C-EM. Please read these instructions carefully before installation and use to ensure proper function and to prevent damage or injury. Keep this manual for future reference.
2. Safety Information
General Safety Warnings:
- Always disconnect the power supply before performing any work on the pump or its electrical components.
- Installation and maintenance should only be performed by qualified personnel in accordance with local regulations and standards.
- Ensure the pump is correctly grounded to prevent electrical shock.
- Do not operate the pump dry. Running without water will cause severe damage.
- Protect the pump from freezing temperatures.
- Use only genuine Wilo spare parts for repairs.
3. Setup and Installation
3.1 Unpacking
Carefully remove the pump from its packaging. Inspect the pump for any visible damage that may have occurred during transit. Report any damage to your supplier immediately.
Figure 1: Wilo SUB TWU 4 Submersible Pump. This image shows the pump unit, highlighting its compact design suitable for well installation.
3.2 Pump Selection Guide (TWU Series)
The following table provides a guide for selecting the appropriate TWU series pump based on required head (H) and flow rate (Q). This helps ensure optimal performance for your specific application.
| H/Q | <2.5 m³/h | 2.5 to 3 m³/h | 3 to 3.5 m³/h | 3.5 to 4 m³/h | 4 to 4.5 m³/h | 4.5 to 5 m³/h | 5 to 5.5 m³/h |
|---|---|---|---|---|---|---|---|
| 110 m | TWU 4-0418-C | ||||||
| 100 m | TWU 4-0418-C | TWU 4-0418-C | |||||
| 90 m | TWU 4-0418-C | TWU 4-0418-C | TWU 4-0418-C | ||||
| 80 m | TWU 4-0414-C | TWU 4-0418-C | TWU 4-0418-C | TWU 4-0418-C | |||
| 70 m | TWU 4-0414-C | TWU 4-0414-C | TWU 4-0414-C | TWU 4-0418-C | TWU 4-0418-C | ||
| 60 m | TWU 4-0414-C | TWU 4-0414-C | TWU 4-0414-C | TWU 4-0414-C | TWU 4-0418-C | ||
| 50 m | TWU 4-0409-C | TWU 4-0414-C | TWU 4-0414-C | TWU 4-0414-C | TWU 4-0414-C | TWU 4-0418-C | TWU 4-0418-C |
| 40 m | TWU 4-0409-C | TWU 4-0409-C | TWU 4-0409-C | TWU 4-0409-C | TWU 4-0414-C | TWU 4-0414-C | TWU 4-0418-C |
| 30 m | TWU 4-0409-C | TWU 4-0409-C | TWU 4-0409-C | TWU 4-0409-C | TWU 4-0409-C | TWU 4-0414-C | TWU 4-0414-C |
| 20 m | TWU 4-0409-C | TWU 4-0409-C | TWU 4-0409-C | TWU 4-0409-C | TWU 4-0409-C | TWU 4-0409-C |
Note: H represents the total head in meters, and Q represents the flow rate in cubic meters per hour. The colors in the table correspond to different pump models (e.g., light blue for TWU 4-0418-C, orange for TWU 4-0414-C, grey for TWU 4-0409-C).
3.3 Electrical Connection
Connect the pump to a suitable power supply according to the pump's specifications and local electrical codes. Ensure the voltage and frequency match the pump's requirements. A residual current device (RCD) with a tripping current of no more than 30 mA is recommended for additional safety.
3.4 Pipe Connection
Connect the discharge pipe to the pump outlet. Ensure all connections are watertight and free from leaks. Use appropriate sealing materials. The pipe diameter should be sufficient to minimize pressure loss.
4. Operating Instructions
4.1 Initial Start-up
Before starting the pump, ensure it is fully submerged in water. Connect the power supply. The pump should start automatically if equipped with a float switch, or manually if controlled by an external switch. Monitor the pump for unusual noises or vibrations during the first few minutes of operation.
4.2 Continuous Operation
The Wilo SUB TWU 4 is designed for continuous operation within its specified performance range. Avoid operating the pump outside these limits to prevent premature wear or damage. Regularly check the water level to ensure the pump remains submerged.
4.3 Shutting Down
To shut down the pump, disconnect the power supply. If the pump is to be out of service for an extended period, follow the maintenance and storage guidelines.
5. Maintenance
Regular maintenance ensures the longevity and reliable operation of your pump.
5.1 Regular Checks
- Inspect the power cable for any signs of damage or wear.
- Check the pump's intake for blockages from debris.
- Ensure all pipe connections remain secure and leak-free.
5.2 Cleaning
If the pump's performance decreases, it may be due to blockages. Disconnect power, remove the pump, and clean the intake screen and impeller area. Use clean water and a soft brush. Do not use harsh chemicals.
5.3 Winterization
If the pump is installed in an area subject to freezing temperatures and will not be used, it must be removed from the water and stored in a frost-free environment. Drain all water from the pump and pipes to prevent damage from ice expansion.
6. Troubleshooting
Before contacting customer support, review the following common issues and their potential solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Pump does not start | No power supply; tripped circuit breaker; faulty float switch; motor fault. | Check power connection; reset breaker; inspect float switch; contact service. |
| Pump runs but no water delivery | Air in system; clogged intake/impeller; low water level; discharge pipe blockage. | Bleed air; clean intake/impeller; ensure pump is submerged; check discharge pipe. |
| Reduced flow rate | Partial blockage; worn impeller; excessive head loss in piping. | Clean pump; inspect impeller; check pipe sizing and condition. |
| Excessive noise or vibration | Debris in pump; worn bearings; improper installation. | Clean pump; contact service for bearing replacement; verify stable installation. |
7. Specifications
Key technical specifications for the Wilo SUB TWU 4 submersible pump, model TWU4-0409-C-EM:
- Brand: Wilo
- Model Number: TWU4-0409-C-EM (also referred to as 'sub twu 4')
- Style: Submersible
- Power: 0.75KW
- GTIN: 04044966515679
- Package Dimensions: 22.8 x 18.8 x 13 cm
- Item Weight: 1.21 kg
- Manufacturer: Wilo
- First Available Date: 16 May 2017
Note: For detailed performance curves and specific electrical data, refer to the official Wilo product documentation or contact Wilo technical support.
8. Warranty and Support
For warranty information, please refer to the warranty card included with your product or visit the official Wilo website. Technical support and spare parts can be obtained through authorized Wilo dealers or directly from Wilo customer service. Please have your model number (TWU4-0409-C-EM) and purchase date available when contacting support.