Because when that screw compressor turns over smoothly, pulls down the chilled water loop, and runs quietly for another 10,000 hours, you’ll know: the best tool you brought to the job wasn’t your gauge set or your torch. It was the manual.
Use only specified synthetic polyolester oil with anti-wear additives. Check the oil level via the separator sight glass; it should be filled to the top. mcquay hsa screw compressor service manual best