Mcquay Hsa Screw Compressor Service Manual =link= Jun 2026

Unbolt the oil filter housing cover. Remove the spent filter cartridge.

Embedded PTC thermistors coupled with an external solid-state protection module (e.g., INT69 or equivalent). 2. Routine Maintenance Schedule

Measure pressure drop across filter; replace filter; check crankcase heater operation. mcquay hsa screw compressor service manual

A solenoid valve opens, allowing high-pressure oil to enter the cylinder. This forces the piston forward, closing the bypass port and increasing compressor capacity.

The compressor is based on a . Its capacity is controlled by a slide valve , an internal component that moves to increase or decrease the compressor's output. Solenoids mounted on the compressor control oil flow to the slide valve actuator. Depending on which solenoids are energized, the slide valve moves to load (increase capacity) or unload (decrease capacity) the compressor in stages (e.g., 100%, 75%, 50%, 25%). Unbolt the oil filter housing cover

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

: Infinitely variable from 100% down to 25% using a microprocessor-controlled capacity slide. This forces the piston forward, closing the bypass

Perform "Test 2 (field)" to verify slide tightness and solenoid seal.