Mcquay Hsa Screw Compressor Service Manual

Remedy: Verify voltage to the solenoid coil; check for mechanical binding inside the valve body. Refrigerant dilution in oil.

Always consult the specific unit nameplate or McQuay service bulletin for approved lubricants.

Check the coils for electrical continuity. Replace burnt-out coils.

Locate the oil filter chamber cover. Loosen the bolts slowly to release residual pressure.

Clean the seal cavity with a lint-free cloth and apply clean compressor oil to the new O-rings. mcquay hsa screw compressor service manual

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High condensing pressure; Mechanical binding inside screws; Low voltage supply.

Power on the crankcase heaters for at least 24 hours prior to starting the compressor to fully boil off any residual liquid refrigerant trapped in the oil reservoir.

Install a temporary suction strainer during the initial break-in period, replacing it with a permanent core after the first 48 hours of operation. Leak Testing and Evacuation Remedy: Verify voltage to the solenoid coil; check

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

Check the oil injection solenoid valve operation and clean the external oil heat exchanger. Excessive Mechanical Noise / Vibration

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A reading below 20 Megohms indicates moisture contamination or insulation degradation. A reading below 1 Megohm indicates a grounded motor that must be replaced. Thermistor Circuit Check Check the coils for electrical continuity

Periodic replacement of oil filters and refrigerant filters.

Evacuate the isolated compressor down to a minimum of 500 microns. Perform a vacuum hold test for 30 minutes to guarantee there are no ambient air or moisture leaks.

: Replace the internal oil filter element and suction strainers.

Evacuate the air from the filter chamber before opening the isolation valves. 4. Slide Valve and Capacity Control Service