Mcquay Hsa — Screw Compressor Service Manual

McQuay HSA series semi-hermetic screw compressors are engineering workhorses found in many commercial and industrial water chillers. Known for their reliability, high efficiency, and quiet operation, these compressors require strict adherence to proper maintenance and service protocols to ensure longevity.

Oil pump (manual or electric) and clean oil sampling containers.

Clogged oil filter cartridge.Refrigerant diluted within the oil charge.Worn internal oil galleries. mcquay hsa screw compressor service manual

All casing bolts, terminal pins, and service valve bolts must be tightened in a star pattern to the torque specifications outlined in the specific HSA model supplement sheet. Never reuse old gaskets or O-rings during reassembly.

What is the compressor currently showing? What refrigerant type is used in your system? Share public link Clogged oil filter cartridge

Replace the oil filter during every annual service, or more frequently if pressure drop across the filter is excessive.

McQuay HSA Screw Compressor Service Manual provides essential technical information for the installation, operation, and maintenance of HSA series single-screw compressors commonly found in McQuay air-cooled and water-cooled chillers. Core Service & Maintenance Guidelines Based on documentation for similar models (like the HS-3100 series What is the compressor currently showing

If the compressor fails to load or unload correctly, the slide valve mechanism requires inspection.

If you can tell me the (found on the compressor nameplate), I can help you find specific wiring diagrams or solenoid valve part numbers .