1. Introduzione
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.
E caratteristiche chjave includenu:
- 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. Informazioni di sicurezza
ATTENZIONE: To reduce the risk of electric shock, consult the instruction manual for proper installation and operation. Always disconnect power before servicing the pump.
ATTENZIONE: The pump surface can become HOT during operation. Avoid direct contact to prevent burns. Allow the pump to cool before handling or performing maintenance.
- Assicuratevi chì tutti i cunnessione elettriche sianu conformi à i codici è à i regulamenti lucali.
- This pump is designed for indoor use only.
- Ùn operate micca a pompa senza acqua.
- Solu u persunale qualificatu deve fà a stallazione è a manutenzione.
3. Produttu Finituview è cumpunenti

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.
- Motore: 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. Installazione è Setup
Proper installation is crucial for the pump's performance and longevity. Refer to local plumbing and electrical codes.
- Muntamentu: 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.
- Cunnessioni di Plumbing: Connect the system piping to the pump's flanges. Use the provided gaskets (O-rings) to ensure a watertight seal. Avoid overtightening connections.
- Cablaggio Elettricu:
- 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.
- Assicuratevi di mette a terra curretta per prevene i periculi elettrici.
- 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.
- Selezzione di velocità: 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.
- Velocità 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.
- Valve di cuntrollu: The built-in check valve can be removed if not required by your system design. Consult your HVAC professional if unsure.
6. Mantenimentu
The Wilo Star S 33 FC pump is designed for minimal maintenance. However, periodic checks can ensure optimal performance and extend its lifespan.
- Ispezione annuale: Annually inspect the pump for any signs of leaks, corrosion, or unusual noises.
- Qualità di l'acqua di u sistema: Ensure the hydronic system water quality is maintained according to industry standards to prevent scale buildup and corrosion within the pump and piping.
- Pulizia: Keep the exterior of the pump clean and free from dust and debris to ensure proper heat dissipation.
- Invernamentu: 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. Risoluzione di prublemi
Vede a tavula seguente per i prublemi cumuni è e so suluzioni putenziali.
| Prublemu | Causa Possibile | Soluzione |
|---|---|---|
| A pompa ùn principia micca | 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. |
| Flussu insufficiente | Air in system; Incorrect speed setting; Clogged filter/piping. | Purge air from system; Increase speed setting; Check and clean filters or piping. |
| Funzionamentu rumoroso | Air in system; Cavitation; Loose mounting. | Purge air from system; Ensure adequate system pressure; Check mounting bolts for tightness. |
| Fughe di pompa | Cunnessione allentate; Guarnizioni/tenute danneggiate. | Tighten connections; Replace gaskets or seals. |
If the problem persists after attempting these solutions, contact a qualified service technician or Wilo customer support.
8. Specificazioni
| Attributu | Detail |
|---|---|
| Numero di mudellu | 4190420 |
| Marca | Wilo |
| Materiale | Cast Iron |
| Voltage | 115 Volts (AC) |
| Frequency | 60 Hz |
| Assegnazione massima attuale | 1.5 Amps |
| Power Consumption (Speed 3) | 202 Watt |
| Power Consumption (Speed 2) | 143 Watt |
| Power Consumption (Speed 1/Eco) | 98 Watt |
| Pesu di l'articulu | 9.46 liri (4.3 chilògrammi) |
| Dimensioni di u pacchettu | 7.4 x 7.24 x 5.12 inch |
| Classe di recinzione | CSA enclosure 2 |
| Classe d'isolazione | Classe F |
| Max. Temperature di l'acqua | 230 ° F (110 ° C) |
| Max. Pressione di travagliu | 145 PSI (10 bar) |
| Certificazioni | Elencatu UL/CSA |
9. Garanzia è 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 websitu.
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 websitu o nantu à a vostra ricevuta di compra.
Wilo Ufficiale Websitu: www.wilo.com





