The Refcomp SW3H-4000 is a 40HP (30kW) semi-hermetic screw refrigeration compressor engineered for high-temperature R22 applications. It combines an optimized asymmetric rotor profile with flexible capacity regulation and intelligent motor protection to deliver reliable, efficient performance in demanding industrial refrigeration systems.
The SW3H-4000 features RefComp's asymmetric 5/6-tooth rotor profile and an optimized length-to-diameter ratio. This design promotes smooth rotor engagement, reduces vibration, and helps improve compression efficiency.
The compressor offers four-step capacity regulation or stepless control from 25% to 100%. These options allow compressor output to follow changing cooling demands, helping reduce unnecessary full-load operation and improve load matching.
The INT69 SNY protection module monitors motor overheating, reverse phase sequence, and phase loss. Combined with six PTC thermistors and operating-status feedback, it helps protect the motor and makes abnormal conditions easier to identify.
The semi-hermetic screw compressor features an internal discharge check valve that helps prevent refrigerant backflow during shutdown. Its 360° rotatable suction and discharge shut-off valves also simplify piping arrangements and provide greater installation flexibility.
| Model | SW3H-4000 |
|---|---|
| Rated Power | 40HP / 30kW |
| Displacement (50/60Hz) | 118 / 142 m³/hr |
| Weight | 245 kg |
| Capacity Regulation | 25%, 50%, 75%, 100% 4-step; 25%–100% stepless |
| Standard Motor | Y/△ – 400V/3/50Hz – 460V/3/60Hz |
| Star/Delta Start Current | 131 / 398A |
| Max Operating Current | 75A |
Q1: What information is needed to select the SW3H-4000 for a refrigeration system?
For this screw refrigeration compressor, provide the required cooling capacity, refrigerant, evaporating and condensing temperatures, power supply, and expected load conditions. These details help verify whether the model matches the system's operating requirements.
Q2: How should I choose between stepped and stepless capacity control?
Consider how frequently the cooling load changes and how precisely the system needs to adjust compressor output. Confirm the required control configuration and its compatibility with the system controller before ordering.
Q3: What electrical checks are necessary before commissioning?
Before starting this 40HP screw compressor, confirm that the available power supply matches the specified motor configuration. Check the star-delta starter connections, phase sequence, and motor protection wiring against the manufacturer's electrical diagram.
Q4: What should I check when integrating the compressor into an existing refrigeration system?
For an industrial refrigeration screw compressor installation, compare the suction and discharge pipe connections, oil-line fitting, and available installation space with the existing system. Ensure the shut-off valves remain accessible for operation and maintenance.
