Mcquay Hsa Screw Compressor Service Manual

Check oil levels before every start. Professional oil analysis and changes are recommended every 4,000 to 8,000 hours or annually. Filter Replacement: Oil Filters: Replace every 2,000 hours.

| Problem | Likely Cause (from manual) | Solution | | :--- | :--- | :--- | | High discharge temp | Low suction superheat or oil starvation | Check expansion valve, clean oil strainer | | No capacity control | Slide valve stuck or broken piston ring | Remove actuator, inspect slide valve bore | | Loud rattling noise | Worn rotor bearings or debris in rotors | Immediate teardown – do not restart | | Oil level dropping | Failed oil separator coalescer or leaking shaft seal | Replace separator element, replace shaft seal kit | mcquay hsa screw compressor service manual

: The balanced compression process leads to reduced vibration compared to traditional twin-screw designs. Protective Sensors Check oil levels before every start