Trane TRG-TRC004-EN Air Compressor User Manual


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40 TRG-TRC004-EN
notes
period four
Review
Period Three considered the entire system and discussed how the capacity of
the compressor is controlled to maintain desired space conditions.
In a constant-volume DX system, in order to respond to changing loads, the
capacity of the compressor is controlled by directly sensing space temperature.
In a VAV DX system, the capacity of the compressor is controlled by sensing the
supply air temperature. In a chilled-water system, the capacity of the
compressor is typically controlled by sensing the temperature of the water
leaving the evaporator.
Period Three also discussed sensing suction temperature and hot gas bypass as
methods for preventing evaporator freeze-up.
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Figure 54
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