Modulating and variable speed compressors. Copeland Company has a few options when it comes to capacity control. Single speed scroll compressors run at 3500 RPM and are either on or off. 2 stage scroll compressors run at 65% first stage and 100% second stage. This compressor can help in shoulder seasons when full capacity is not needed. Multi stage systems can include 3 stages or more of capacity control. An example of this would be a 4 stage rooftop or a compressor that is outfitted with unload
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