The SW3H-7500 refrigeration screw compressor uses RefComp's asymmetric 5/6-tooth rotor profile with an optimized length-to-diameter ratio. This design supports smooth rotor engagement, reduces vibration, and helps improve compression efficiency under varying refrigeration loads.
The refrigeration screw compressor offers four-stage capacity control or optional stepless regulation from 25% to 100%. Its sliding-valve mechanism allows output to follow changing cooling demands, improving load matching and reducing unnecessary full-capacity operation.
An integrated 100 μm suction filter captures impurities from incoming refrigerant gas before they reach the motor. This helps protect internal components from contamination and reduces the risk of foreign particles affecting compressor operation.
The 360° rotatable suction and discharge shut-off valves allow flexible piping orientation, simplifying installation in different equipment layouts. An integrated discharge check valve also helps prevent refrigerant backflow during shutdown.
| Model | SW3H-7500 |
|---|---|
| Rated power | 75HP / 55KW |
| Displacement 50/60Hz | 205 / 246 m³/hr |
| Weight | 410KG |
| Capacity Regulation | 25%, 50%, 75%, 100% 4-step; 25%–100% stepless |
| Standard Motor | Y/△ – 400V/3/50Hz – 460/3/60Hz |
| Star/Delta Start Current | 139 / 459A |
| Max operating current | 124A |
Q1: How do I determine whether the SW3H-7500 suits my refrigeration system?
For this refrigeration screw compressor, provide the required cooling capacity, refrigerant, evaporating and condensing temperatures, and power supply. As a high-temperature screw compressor, its operating range should be verified against the actual system conditions rather than selected by horsepower alone.
Q2: What should be considered when selecting the capacity control method?
Consider how frequently the refrigeration load changes and the level of control precision required. Confirm whether the supplied compressor uses stepped or stepless regulation, and ensure the refrigeration controller supports the selected configuration.
Q3: What electrical checks are needed before starting the compressor?
For this 75 HP screw compressor, verify the motor voltage, frequency, phase sequence, and star-delta starter wiring. Ensure all protection circuits are correctly connected before commissioning to reduce the risk of electrical faults.
Q4: What should be checked when replacing an existing compressor with the SW3H-7500?
Before installing this semi-hermetic screw compressor, compare the mounting arrangement, suction and discharge connections, oil-line fitting, and available service space. Electrical and capacity-control compatibility should also be checked against the existing system.
