RF circulator Star series

Product family

• Wet rotor circulator

Key features

• Reliable wet rotor technology
• Quick connect wiring
• Powerful starting torque
• Ultra quiet
• Installable hi-temp check (RFC model)
• RFC Patented Rotating Flange: US 8,297,664 B2

Design

• Wet rotor circulation pump, with flanged or union connections.
• Pre-selectable speeds to adjust the capacity on "S" versions.

Application

• Hot Water Heating Systems
• Chilled Water
• Air Conditioning Systems
• Water/Glycol concentrations up to 50%
• Solar
• Geothermal
• Max. Flow: 38 GPM
• Max. Head: 33 feet

Equipment / function

• 3 manual selectable speed stages ("S" type only)
• Reliable wet rotor technology
• Quick connect wiring
• Powerful starting torque
• Ultra quiet
• Installable hi-temp check (RFC model)
• RFC Patented Rotating Flange

Type key (table)
Wilo-Star S 21 RFC — Wilo-Star S 21 RFC
Star — Standard pump
S — 3 Speed
21 — Max. Head
RF — Rotating Flange
C — Check Valve
Z — Stainless Steel Volute
F — Flanged

Technical data

• Max Temp Range: 14°F to 230°F (-10°C to 110°C)
• Max Ambient Temperature: 104°F (40°C)
• Electrical Connection: 1~115 V (Star S33 available in 1~115 V and 1~230 V)
• Max Working Pressure: 140 PSI (10 Bar)

Materials

• Cast iron volute
• Engineered composite impeller
• Stainless steel shaft
• Carbon impregnated bearing
• Steel terminal box

Scope of delivery

• Pump
• Flange gaskets
• Installation and operating instructions

Options

• Ventilation pump Star‐RSL 25/6 with automatic ventilation connection
• Special versions 25/4 and 25/6: overall length 130 mm (cast iron) or 180 mm (red bronze)

Caractéristiques / spécifications techniques

• Series name: Star / Star-S
• Type variants: multiple (e.g. Star 17FX, Star 30F, Star 32F, Star S 21F, Star S 21FX, Star S 21 RFC, Star S 21 ZFX, Star S 33 FC, Star S 33 FC+, Star S 33 ZF, etc.)
• Pump connections: flanged or union; flange sizes include 0.75"–1.5" two-bolt flange and 1.5" HV flange (depending on model)
• Mains connection options: 1~115 V, 60 Hz and 1~230 V, 60 Hz (model dependent)
• Pieces per pallet and article numbers vary by model (examples: 68 pcs / article 4100870; 78 pcs / article 4095807; 100 pcs / article 4090770; 87 pcs / article 4105032; 96 pcs / article 4190420; etc.)
• Maximum operating pressure: 140 psi (10 bar)