1. Introduction
The Wilo Star S 33 FC 4190420 is a three-speed hydronic radiant floor circulating pump designed for efficient water circulation in various heating applications. Its robust cast iron housing and built-in motor protection ensure long life and reliable performance. This pump is suitable for closed-loop radiant heating, snow melting systems, baseboard, radiator, and fan coil heating applications.
Key features include:
- Fixed flanges for secure installation.
- Cast iron housing with built-in motor protection.
- Versatile application across radiant heating, hydronic heating, fan coil heating, and solar systems.
- Whisper-quiet operation, ideal for sound-sensitive environments.
- Includes two gaskets (O-rings) and a removable check-valve.
- UL/CSA listed for safety and compliance.
2. Safety Information
WARNING: To reduce the risk of electric shock, consult the instruction manual for proper installation and operation. Always disconnect power before servicing the pump.
CAUTION: The pump surface can become HOT during operation. Avoid direct contact to prevent burns. Allow the pump to cool before handling or performing maintenance.
- Ensure all electrical connections comply with local codes and regulations.
- This pump is designed for indoor use only.
- Do not operate the pump without water.
- Only qualified personnel should perform installation and maintenance.
3. Product Overview and Components
Figure 1: Wilo Star S 33 FC Circulating Pump. This image shows the main body of the pump, its electrical connection box, and the speed selection dial. The green cast iron housing is visible, along with the product label detailing specifications and warnings.
The Wilo Star S 33 FC pump consists of several key components:
- Cast Iron Housing: The main green body of the pump, providing durability and heat dissipation.
- Motor: Integrated within the housing, providing the power for circulation.
- Speed Selection Dial: Located on the front label, allowing selection between three speeds (1, 2, 3) and an "eco" mode.
- Electrical Connection Box: Black box on the side for power input.
- Fixed Flanges: Connection points for plumbing lines.
- Built-in Removable Check Valve: Helps prevent backflow in the system.
4. Installation and Setup
Proper installation is crucial for the pump's performance and longevity. Refer to local plumbing and electrical codes.
- Mounting: Securely mount the pump using its fixed flanges in the designated location within your hydronic system. Ensure the pump is installed in a horizontal position with the motor shaft horizontal to prevent air pockets.
- Plumbing Connections: Connect the system piping to the pump's flanges. Use the provided gaskets (O-rings) to ensure a watertight seal. Avoid overtightening connections.
- Electrical Wiring:
- Ensure the power supply is disconnected before wiring.
- Connect the pump to a 115-Volt (AC), 60Hz power supply. The pump draws a maximum of 1.5A.
- Follow the wiring diagram provided inside the electrical connection box.
- Ensure proper grounding to prevent electrical hazards.
- System Filling and Purging: After installation, fill the hydronic system with water and thoroughly purge any air from the system. Air in the system can cause noise and reduce pump efficiency.
5. Operating Instructions
The Wilo Star S 33 FC features a three-speed motor, allowing you to adjust the pump's performance to match your system's requirements.
- Power On: Once installed and the system is filled, restore power to the pump.
- Speed Selection: Locate the speed selection dial on the front of the pump (refer to Figure 1). The dial has settings for "max", "3", "2", "1", and "eco".
- Speed 3 (Max): Provides the highest flow rate and pressure. Power consumption is approximately 202W.
- Speed 2: Medium flow rate and pressure. Power consumption is approximately 143W.
- Speed 1 (Eco): Lowest flow rate and pressure, designed for energy efficiency. Power consumption is approximately 98W.
- Check Valve: The built-in check valve can be removed if not required by your system design. Consult your HVAC professional if unsure.
6. Maintenance
The Wilo Star S 33 FC pump is designed for minimal maintenance. However, periodic checks can ensure optimal performance and extend its lifespan.
- Annual Inspection: Annually inspect the pump for any signs of leaks, corrosion, or unusual noises.
- System Water Quality: Ensure the hydronic system water quality is maintained according to industry standards to prevent scale buildup and corrosion within the pump and piping.
- Cleaning: Keep the exterior of the pump clean and free from dust and debris to ensure proper heat dissipation.
- Winterization: If the system is shut down for an extended period in freezing temperatures, ensure the pump and system are properly drained to prevent freeze damage.
7. Troubleshooting
Refer to the following table for common issues and their potential solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Pump does not start | No power supply; Motor overload; Impeller jammed. | Check power connection and circuit breaker; Allow motor to cool; Disconnect power and check for obstructions in impeller. |
| Insufficient flow | Air in system; Incorrect speed setting; Clogged filter/piping. | Purge air from system; Increase speed setting; Check and clean filters or piping. |
| Noisy operation | Air in system; Cavitation; Loose mounting. | Purge air from system; Ensure adequate system pressure; Check mounting bolts for tightness. |
| Pump leaks | Loose connections; Damaged gaskets/seals. | Tighten connections; Replace gaskets or seals. |
If the problem persists after attempting these solutions, contact a qualified service technician or Wilo customer support.
8. Specifications
| Attribute | Detail |
|---|---|
| Model Number | 4190420 |
| Brand | Wilo |
| Material | Cast Iron |
| Voltage | 115 Volts (AC) |
| Frequency | 60 Hz |
| Max Current Draw | 1.5 Amps |
| Power Consumption (Speed 3) | 202 Watts |
| Power Consumption (Speed 2) | 143 Watts |
| Power Consumption (Speed 1/Eco) | 98 Watts |
| Item Weight | 9.46 pounds (4.3 Kilograms) |
| Package Dimensions | 7.4 x 7.24 x 5.12 inches |
| Enclosure Class | CSA enclosure 2 |
| Insulation Class | Class F |
| Max. Water Temperature | 230°F (110°C) |
| Max. Working Pressure | 145 PSI (10 bar) |
| Certifications | UL/CSA listed |
9. Warranty and Support
Wilo products are manufactured to high standards and come with a manufacturer's warranty. For specific warranty terms and conditions, please refer to the documentation included with your purchase or visit the official Wilo website.
For technical support, troubleshooting assistance, or to inquire about replacement parts, please contact Wilo customer service. Contact information can typically be found on the Wilo website or on your purchase receipt.
Wilo Official Website: www.wilo.com
