Trane TRG-TRC004-EN Air Compressor User Manual


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8 TRG-TRC004-EN
notes
period one
Compressor Types
The center of the scroll journal bearing and the center of the motor shaft are
offset. This offset imparts an orbiting motion to the driven scroll. Rotation of the
motor shaft causes the scroll to orbit—not rotate—about the shaft center.
This orbiting motion causes the mated scrolls to form pockets of refrigerant
vapor. As the orbiting motion continues, the relative movement between the
orbiting scroll and the stationary scroll causes the pockets to move toward the
discharge port at the center of the assembly, gradually decreasing the
refrigerant volume and increasing the pressure.
Three revolutions of the motor shaft are required to complete the compression
process.
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