Mcquay Hsa Screw Compressor Service Manual ((install)) May 2026

The McQuay HSA series consists of semi-hermetic, single-screw asymmetric compressors often used in large air-cooled and water-cooled chillers like the McQuay AWS and WHS models . These compressors are known for their "StarGate" single-screw technology, which utilizes a main rotor and two gate rotors to achieve balanced compression. Essential Manuals & Documentation

Key Sections in a Service Manual

Contents of the McQuay HSA Screw Compressor Service Manual mcquay hsa screw compressor service manual

Mistake #3: Ignoring the Oil Differential Pressure

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). Daikin Applied (McQuay) Business Portal : www

7. Where to Find the Full Manual

• Daikin Applied (McQuay) Business Portal: www.daikinapplied.com (register as contractor).
• Contact local Daikin office with compressor serial number – they may email PDF.
• Commercial manual archives (e.g., ManualsLib, Scribd) – search "McQuay HSA 126 service manual".
• Used HVAC forums (HVAC-Talk, Chiller Forum) – members sometimes share legacy manuals.