A 24-volt DC solenoid valve inside the compressor provides the means to modulate the compressor.
When the solenoid valve is energized the compressor is in full-load and when de-energized the compressor is in part-load. When the solenoid is energized a 3-way solenoid valve provides pressure to a lift ring assembly that is used to open and close the scroll modulation ports. A single-speed motor continues to run while the scroll modulates between the two capacity stages.

Two-stage podcast –

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2 thoughts on “Copeland Two Stage Scroll

  1. Toyin Orodare says:

    Hello Trevor,
    According to the Table for R410a the Critical Temperature is 165°F. If the gas Condensing Temperature is 120°F / 419psig, will the CUT-OUT pressure at 650psig not too high that it would destroy the Compressor?
    However from the Refrigeration and Air-conditioning book, the cut out pressure is put at 50psig above condensing pressure

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