The McQuay HSA is a semi-hermetic screw compressor, a type of positive displacement compressor that uses two interlocking helical rotors (male and female) to compress refrigerant gas. The "semi-hermetic" designation means the motor and compressor are housed in a single, serviceable, bolted casing, as opposed to a "hermetic" unit which is welded shut, or an "open" unit with an external motor. These compressors are typically found in medium-to-large commercial and industrial HVAC systems, specifically Daikin McQuay air-cooled and water-cooled chiller units.
Pump oil into the crankcase until it reaches the upper third of the oil sight glass.
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When servicing the lubrication system, cleanliness is vital. Contaminants entering the compressor housing will score the rotors. Required Tools and Materials
To maximize the lifespan of your McQuay HSA screw compressor, ensure the following systems are always functional: The McQuay HSA is a semi-hermetic screw compressor,
: Regular inspections and servicing are generally recommended every 6 to 12 months to ensure longevity and efficiency. Start-up Protection
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Pump oil into the crankcase until it reaches
: Take an oil sample to test for acidity, moisture content, and PPM (parts per million) of wear metals.
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This comprehensive technical guide serves as a practical reference for HVAC technicians and facility engineers to install, maintain, and troubleshoot McQuay HSA screw compressors. 1. Product Overview and Design Characteristics