📄 Download the Danfoss iSave 21 Plus / iSave 40 Data Sheet (PDF) Official Danfoss document AI243586503158
The Danfoss iSave 21 Plus Energy Recovery Device with 15 HP NEMA motor (180U0052) is an isobaric Energy Recovery Device for seawater reverse osmosis. It combines an isobaric pressure exchanger, a vane-type high-pressure booster pump and a NEMA electric motor on a single shaft in one compact unit — recovering the pressure energy in the membrane brine stream and cutting SWRO energy consumption by up to 60%. All wetted parts are highly corrosion-resistant (Super Duplex / Duplex stainless), the unit is lubricated by the pumped seawater itself, and flow is proportional to speed for simple VFD control without high-pressure flow meters.
| Product Information | |
|---|---|
| Type / Model | iSave 21 Plus, NEMA motor version (US market) |
| Part Number | 180U0052 |
| Brand | Danfoss |
| Country of Origin | Denmark |
| Wetted Parts | Super Duplex / Duplex stainless steel |
| Certification | Delivered with EN 10204 3.1 performance certificate |
| Mounting | Horizontal or vertical |
| Warranty | Danfoss guarantees 8,000 hours of service-free operation (max. 18 months from date of production) when installed and operated to Danfoss specifications — see the product manual for conditions |
| Technical Data (per Danfoss data sheet) | |
|---|---|
| HP Outlet Flow Range | 6–22 m³/h (26–96 GPM) |
| Max. Outlet Pressure (MAWP) | 83 barg (1,200 psig) |
| Max. Pressure Boost (HP in → HP out) | 5 bar (72.5 psi) |
| Speed Range (VFD) | 500–1,500 rpm |
| Motor | 11 kW / 15 HP NEMA 254 frame, 4-pole, 460 V 60 Hz, TEFC, IP55 |
| Media Temperature | 2–40 °C (36–104 °F) |
| Feed Filtration | 5 micron (nominal) |
| Sound Pressure Level | 79 dB(A) @ 1 m |
| Unit Weight | 206 kg (454 lbs) |
| Shipping Information | |
|---|---|
| Shipping Weight | ~500 lbs (crated, freight) |
| Shipping Dimensions | Crated for freight — contact us for crate dimensions |
Note: The iSave requires a VFD capable of constant torque from low to maximum speed (e.g. Danfoss FC 301/302) and 5-micron nominal feed filtration.
📄 Download the Danfoss Operation Manual (PDF) Official Danfoss document AQ261351057880en
