K2E225-RA92-01: High-Efficiency Radial Module
The K2E225-RA92-01 is a high-performance 225mm centrifugal fan module from ebm-papst. Unlike bare motorized impellers, the «K» designation typically indicates a module that may include the support bracket or inlet ring arrangement, designed for easy integration into customer applications such as air handling units, electronics cooling, and duct fans. It features a backward-curved impeller made of fiberglass-reinforced plastic (PA6). This aerodynamic design allows the fan to build up significant static pressure while remaining acoustically quiet and energy-efficient compared to forward-curved alternatives.
Technical Specifications
- Impeller Diameter: 225 mm.
- Voltage: 230 VAC (Single-phase, 50/60 Hz).
- Motor: M2E068-DF (AC External Rotor).
- Blade Type: Backward curved (7 blades).
- Speed: Approx. 2600 – 2700 RPM.
- Power Input: 135 W.
- Capacitor: Required (Check label, usually 4-5 µF).
Lifecycle & Maintenance Diagnosis
Lifecycle State: Active. Widely used in compact HVAC units. Diagnosis: The backward-curved design is non-overloading, meaning the motor is safer than forward-curved types if filters clog. However, if the fan fails to start, 90% of field issues are traced to the permanent split capacitor (PSC). If the capacitor value drops (e.g., from 4µF to 2µF), torque is lost, and the motor overheats. Installation Tips: Ensure the inlet ring overlap is precise. A gap larger than specified (typically 1-2mm) will cause massive efficiency loss and increased noise due to turbulence. Compatibility: Fully compatible with Siemens SIMATIC relay outputs for ON/OFF control. For speed control, it works well with transformer-based voltage controllers, allowing for simple day/night setback strategies in ventilation systems.
| Metric | Performance Data |
|---|---|
| Max Airflow | 850 – 950 m³/h |
| Current Draw | 0.60 A |
| Max Amb. Temp | +65°C |
| Weight | 2.3 kg |
Why Plastic Impeller?
The PA6 composite impeller is lightweight, reducing the moment of inertia. This means faster start-up times and less stress on the motor bearings compared to steel impellers.
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