Mcquay Hsa Screw Compressor Service Manual

  • Monthly:
  • Quarterly (or 2,000–4,000 operating hours):
  • Annually (or 8,000–12,000 hours):
  • Major overhaul (per manual advisories or when performance degrades):

    • The manual states: “If oil pressure differential falls below 15 PSID for more than 3 seconds, the controller shall trip the compressor.” Low differential means bearing starvation. Action: Clean the oil filter (detailed procedure in Section H).

    Before diving into the service manual, one must understand what the HSA compressor is. The "HSA" designation typically refers to a line of semi-hermetic screw compressors used in McQuay chillers (such as the WDC, WHS, and RPS models).

    Only for major overhaul – requires compressor removal. mcquay hsa screw compressor service manual

    Scenario: A 200-ton McQuay chiller with an HSA-200 compressor trips on “High Motor Current.”

    Without the manual: Technician replaces the starter and contacts motor rewinder. Problem persists. Monthly:

    With the manual: Technician turns to Section G – Troubleshooting. High motor current cross-references to:

    Following the manual’s step-by-step:

    Lesson: The manual turned a mysterious electrical trip into a mechanical repair.