1. Introduction
The Wilo Star S 16 FX circulating pump is designed for efficient and reliable operation in hydronic radiant floor heating and other closed-loop system applications. Featuring a robust cast iron housing and a three-speed motor, this circulator provides optimal performance for various heating needs. Its quiet operation makes it suitable for sound-sensitive installations.
2. Safety Information
WARNING: To reduce the risk of electric shock, fire, or injury, always follow these safety precautions.
- Do not install the pump with the motor positioned directly above or below the pump body.
- This product is designed for indoor use only.
- Refer to the complete instruction manual for proper installation procedures to prevent electric shock.
- The maximum permissible water temperature is 230°F (110°C).
- Use only copper conductors for electrical connections.
- Do not operate the pump without fluid (dry run) as this can cause severe damage.
- The pump operates on 115 Volts, 60 Hz, with a maximum current draw of 0.66 Amperes.
- The maximum working pressure for this unit is 145 PSI.
- The motor is Class F insulated with a -7µf capacitor.
3. Product Overview
Key Features:
- Cast iron housing for durability.
- 90-degree rotated flanges for flexible installation.
- Three-speed motor (Low/Medium/High) for adjustable performance.
- Maximum head of 16 feet.
- Built-in motor protection for extended life and improved performance.
- Suitable for various applications including water and glycol radiant floor heating, hydronic heating, fan coil heating, and solar water heating.
- Whisper-quiet operation.
- UL/CSA listed for safety compliance.
- Manufactured in France.
Included Components:
- 1 x Wilo Star S 16 FX Circulator Pump
- 2 x Gaskets (O-rings)
Product Images:
4. Setup and Installation
The Wilo Star S 16 FX pump is designed for straightforward installation in closed-loop heating systems. Its 90-degree rotated flanges offer flexibility in pipe connection. Ensure the system is depressurized and drained before beginning installation. Always follow local plumbing and electrical codes. The included gaskets (O-rings) should be properly seated to ensure a watertight seal.
For detailed installation steps, including pipe sizing, electrical wiring, and system filling, consult a qualified professional or the comprehensive installation guide provided with the product.
5. Operating Instructions
The Wilo Star S 16 FX features a three-speed motor, allowing you to adjust the pump's performance to match your system's requirements. The speed settings are typically labeled Low, Medium, and High (or 1, 2, 3, and Eco/Max on the dial).
- Speed Selection: Locate the selector dial on the front of the pump's motor housing.
- Adjusting Speed: Rotate the dial to select the desired speed setting. Higher settings provide greater flow and head, while lower settings consume less energy and are suitable for systems with lower demand.
- Initial Operation: After installation and system filling, ensure all air is purged from the system before starting the pump. Start the pump on a lower speed setting and gradually increase if more flow is required.
Refer to the performance curve chart in the Product Overview section to understand the pump's capabilities at different speeds.
6. Maintenance
The Wilo Star S 16 FX circulating pump is designed for minimal maintenance. Regular checks can help ensure its longevity and efficient operation:
- System Pressure: Periodically check your heating system's pressure to ensure it is within the recommended operating range.
- Leak Detection: Inspect the pump and connections for any signs of leaks. Address any leaks promptly to prevent system damage.
- Noise Levels: Listen for any unusual noises during operation. Excessive noise could indicate air in the system or a mechanical issue.
- Cleanliness: Keep the pump and surrounding area clean and free from debris to ensure proper ventilation and prevent overheating.
For any complex maintenance or repairs, it is recommended to contact a qualified HVAC technician.
7. Troubleshooting
This section provides general guidance for common issues. For persistent problems, consult a professional.
| Problem | Possible Cause | Solution |
|---|---|---|
| Pump not running | No power; tripped breaker; motor protection activated; seized impeller | Check power supply and breaker; allow motor to cool; consult technician for seized impeller |
| Pump is noisy | Air in system; cavitation; foreign object in pump; worn bearings | Bleed air from system; check system pressure; inspect pump for obstructions; consult technician |
| Insufficient flow/head | Incorrect speed setting; air in system; clogged filter/strainer; undersized pump for application | Adjust speed setting; bleed air; clean filter; verify pump sizing for system requirements |
| Leaking at connections | Improperly seated gaskets; loose connections; damaged flanges | Ensure gaskets are correctly installed; tighten connections; inspect flanges for damage |
8. Specifications
| Specification | Value |
|---|---|
| Brand | Wilo |
| Model Number | 4090764 |
| Material | Cast Iron |
| Color | Green |
| Style | Circulator |
| Voltage | 115 Volts |
| Frequency | 60 Hz |
| Maximum Current (I max) | 0.66 Amperes |
| Maximum Lifting Height (Head) | 16 Feet |
| Maximum Water Temperature | 230°F (110°C) |
| Maximum Working Pressure | 145 PSI |
| Item Weight | 1.96 pounds (890 Grams) |
| Product Dimensions | 7.75 x 3.25 x 8 inches |
| Included Components | 1 X Circulator pump, 2 X Gaskets |
| Power Source | Solar Powered (Note: This refers to compatibility with solar heating systems, not that the pump itself is solar-powered) |
| Manufacturer | Wilo |
| Country of Origin | France |
9. Warranty and Support
The Wilo Star S 16 FX circulating pump comes with a warranty covering material and workmanship. The warranty period is 24 months for materials and 30 months for workmanship from the date of purchase.
For technical support, warranty claims, or service inquiries, please contact your authorized Wilo dealer or visit the official Wilo website for contact information specific to your region. When contacting support, please have your pump's model number (4090764) and purchase details readily available.
