Trane TRG-TRC004-EN Air Compressor User Manual


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18 TRG-TRC004-EN
notes
The capacity of a compressor is defined by the volume of evaporated
refrigerant that can be compressed within a given time period. The compressor
needs a method of capacity control in order to match the ever-changing load on
the system.
Capacity control is commonly accomplished by unloading the compressor. The
method used for unloading generally depends on the type of compressor.
Many reciprocating compressors use cylinder unloaders. Scroll compressors
generally cycle on and off. Helical-rotary compressors use a slide valve or a
similar unloading device. Centrifugal compressors typically use inlet vanes or a
variable-speed drive in combination with inlet vanes. In addition, all four types
of compressors could use variable speed to control their capacity.
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Figure 28
period two
Compressor Capacity Control
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