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26 TRG-TRC004-EN
notes
period two
Compressor Capacity Control
Slide Valve
The helical-rotary compressor used as the example in this clinic is unloaded
using a slide valve that is an integral part of the compressor housing. Other
helical-rotary compressor designs may use a variety of methods to vary
capacity. Some of these methods are similar in function to the slide valve
presented in this clinic. One major determining factor is whether the
compressor is designed to unload in steps, like a reciprocating compressor, or if
it has variable unloading.
The position of the slide valve along the rotors controls the volume of
refrigerant vapor delivered by the compressor, by varying the amount of rotor
length actually used for compression. By changing the position of the slide
valve, the compressor is able to unload to exactly match the evaporator load,
instead of unloading in steps like the reciprocating compressor discussed
earlier.
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Figure 37