The Refcomp SW3H-21000 is a semi-hermetic screw refrigeration compressor engineered for cold room, HVAC and process cooling applications using R134a and R407C refrigerants. Its asymmetric rotor profile, precision multi-bearing support and integrated filtration deliver stable, efficient compression across demanding operating conditions.
The SW3H-21000 HVAC screw compressor features RefComp's asymmetric 5/6-tooth rotor profile with optimized geometry. This design promotes smooth rotor engagement, reduces vibration and supports efficient compression under changing operating conditions.
This semi-hermetic screw compressor uses a multi-bearing arrangement to handle axial and radial loads, helping maintain stable rotor alignment. Precision fitting and effective lubrication reduce mechanical friction and noise, supporting smooth operation and limiting component wear.
The integrated 100 μm suction filter captures impurities from incoming refrigerant gas before they reach the motor. This helps protect internal components from contamination, reducing the risk of damage caused by foreign particles.
The 360° rotatable suction and discharge shut-off valves allow flexible pipe routing, making installation easier in different equipment layouts. An integrated discharge check valve also helps prevent refrigerant backflow during shutdown.
| Model | SW3H-21000 |
|---|---|
| Rated power | 220HP / 164KW |
| Displacement 50/60Hz | 562 / 674 m³/hr |
| Weight | 1030 KG |
| Capacity Regulation | 25%, 50%, 75%, 100% 4-step; 25%–100% stepless |
| Standard Motor | Y/△ – 400V/3/50Hz – 460/3/60Hz |
| Star/Delta Start Current | 543 / 1645A |
| Max operating current | 335A |
When selecting an HVAC screw compressor, provide the required cooling capacity, refrigerant, evaporating and condensing temperatures, power supply and expected load conditions. These details help verify whether the compressor matches the system's actual operating requirements.
For an air conditioning screw compressor, four-step regulation suits systems with defined load stages, while stepless regulation allows finer output adjustment. Choose the option according to load variation and controller compatibility, and confirm the configuration before ordering.
Before starting this 220 HP screw compressor, verify that the site power supply matches the motor specifications. Check the star-delta starter wiring, phase sequence and INT69 SNY protection connections against the manufacturer's electrical diagram.
If the HVAC screw compressor stops following a protection alarm, check the motor temperature, phase sequence, phase loss and protection wiring. Identify and correct the underlying cause before restarting the compressor.
