Mcquay Hsa Screw Compressor Service Manual

McQuay HSA series screw compressors are heavy-duty, semi-hermetic units engineered for commercial and industrial refrigeration and air conditioning systems. Proper service, preventative maintenance, and timely troubleshooting are essential to ensure high operational efficiency and prevent catastrophic mechanical failure.

Some technicians assume that “any alignment” works. Wrong. The HSA manual shows that a misalignment of 0.002” changes the discharge port opening by 5 degrees, dropping efficiency by 15-20%. Use dial indicators as shown in Figure 12-4 of the manual. mcquay hsa screw compressor service manual