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.
Le caratteristiche principali includono:
- 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 sulla sicurezza
AVVERTIMENTO: 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 CALDO during operation. Avoid direct contact to prevent burns. Allow the pump to cool before handling or performing maintenance.
- Assicurarsi che tutti i collegamenti elettrici siano conformi ai codici e alle normative locali.
- This pump is designed for indoor use only.
- Non azionare la pompa senza acqua.
- Solo personale qualificato dovrebbe eseguire l'installazione e la manutenzione.
3. Prodotto finitoview e componenti

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:
- Alloggiamento in ghisa: 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.
- Scatola di collegamento elettrico: 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 e configurazione
Proper installation is crucial for the pump's performance and longevity. Refer to local plumbing and electrical codes.
- Montaggio: 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.
- Collegamenti idraulici: Connect the system piping to the pump's flanges. Use the provided gaskets (O-rings) to ensure a watertight seal. Avoid overtightening connections.
- Cavi elettrici:
- Prima di procedere al cablaggio, assicurarsi che l'alimentazione sia scollegata.
- 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.
- Garantire una messa a terra adeguata per evitare rischi 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. Istruzioni per l'uso
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.
- Accensione: Once installed and the system is filled, restore power to the pump.
- Selezione della 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".
- Velocità 3 (massima): Provides the highest flow rate and pressure. Power consumption is approximately 202W.
- Velocità 2: Medium flow rate and pressure. Power consumption is approximately 143W.
- Velocità 1 (Eco): Lowest flow rate and pressure, designed for energy efficiency. Power consumption is approximately 98W.
- Valvola di ritegno: The built-in check valve can be removed if not required by your system design. Consult your HVAC professional if unsure.
6. Manutenzione
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: Ispezionare annualmente la pompa per individuare eventuali segni di perdite, corrosione o rumori insoliti.
- Qualità dell'acqua del 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: Mantenere l'esterno della pompa pulito e libero da polvere e detriti per garantire una corretta dissipazione del calore.
- 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. Risoluzione Dei Problemi
Per i problemi più comuni e le possibili soluzioni, fare riferimento alla tabella seguente.
| Problema | Possibile causa | Soluzione |
|---|---|---|
| La pompa non si avvia | Nessuna alimentazione; sovraccarico del motore; girante bloccata. | Check power connection and circuit breaker; Allow motor to cool; Disconnect power and check for obstructions in impeller. |
| Flusso insufficiente | Air in system; Incorrect speed setting; Clogged filter/piping. | Purge air from system; Increase speed setting; Check and clean filters or piping. |
| Funzionamento rumoroso | Air in system; Cavitation; Loose mounting. | Purge air from system; Ensure adequate system pressure; Check mounting bolts for tightness. |
| La pompa perde | 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. Specifiche
| Attributo | Dettaglio |
|---|---|
| Numero di modello | 4190420 |
| Marca | Villo |
| Materiale | Ghisa |
| Voltage | 115 Volt (CA) |
| Frequenza | Frequenza 60 Hz |
| Assorbimento di corrente massimo | 1.5 Amps |
| Power Consumption (Speed 3) | 202 Watt |
| Power Consumption (Speed 2) | 143 Watt |
| Power Consumption (Speed 1/Eco) | 98 Watt |
| Peso dell'articolo | 9.46 libbre (4.3 chilogrammi) |
| Dimensioni del pacco | 7.4 x 7.24 x 5.12 pollici |
| Classe di custodia | Allegato CSA 2 |
| Classe di isolamento | Classe F |
| Massimo Temperatura dell'acqua | 230°F (110°C) |
| Pressione massima di esercizio | 145 PSI (10 bar) |
| Certificazioni | Certificato UL/CSA |
9. Garanzia e supporto
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 websito.
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 websito o sulla ricevuta d'acquisto.
Funzionario Wilo Websito: www.wilo.com





