Mcquay Hsa Screw Compressor Service Manual ◆ ❲FAST❳

Insert the new filter, replace the housing cover gasket/O-ring, and torque the cover bolts to specification in a cross-pattern.

Always replace the housing O-rings and torque all bolts to the specific foot-pounds (ft-lbs) documented in your model's manual suffix. Shaft Seal Replacement (Open-Drive Models) For open-drive variants of the HSA series:

Lubricate the new shaft seal elastomeric elements with clean compressor POE oil before sliding them onto the shaft. Avoid touching the polished carbon and ceramic faces with bare skin, as finger oils can cause premature seal failure. 6. Post-Service Commissioning and Startup Checklist

Correct installation mitigates the risk of early mechanical failure. Before starting a newly installed or newly serviced HSA compressor, execute these crucial checks: Rigging and Handling

The slide valve regulates the volume of suction gas entering the screws. It is actuated by a hydraulic piston driven by system oil pressure and controlled by external solenoid valves (Load / Unload solenoids). Slide Valve Troubleshooting Potential Cause Corrective Action mcquay hsa screw compressor service manual

Ensure the oil separator is filled with the exact volume and viscosity of OEM-approved POE oil.

A service manual provides a strict maintenance schedule. For a screw compressor, this schedule is critical. While the exact interval for an HSA is model-specific, a standard industrial screw compressor schedule is:

Draw an oil sample to test for acidity, moisture content, and PPM of wear metals. Electrical Tightening

Measure voltage across all three phases.Check resistance of motor windings and thermistor chain.Perform a manual rotation test on the shaft. Insert the new filter, replace the housing cover

The system contains high-pressure refrigerant. Ensure the system is properly evacuated before opening any circuit. B. Installation Guidelines

An open circuit (infinite resistance) or short circuit (near 0 Ohms) indicates a damaged thermistor string requiring external protection workarounds or motor replacement. 6. Routine Preventative Maintenance Schedule Action Item Description Oil Level Check Verify oil level sits between of the oil separator sight glass during steady-state run. Monthly Operating Parameters

Check for total acid number (TAN), moisture content (ppm), and presence of wear metals (iron, copper, aluminum).

: Keep operational oil temperatures between 100°F and 140°F (38°C to 60°C). 3. Routine Inspection and Preventive Maintenance Avoid touching the polished carbon and ceramic faces

To check the integrity of the motor windings, use a megohmmeter (Megger):

Replace the oil charge if the system has logged over 4,000 operational hours or if the acid test fails.

Always use new gaskets, O-rings, and seals during reassembly.

: The HSA series typically requires synthetic polyolester oil (such as McQuay Part # 735030446).