035-19569-101 (0109)
2-2
GB
2.2 Capacity Control (Figure 2.2)
The major components of a chiller are selected for full
load capacities, therefore capacity must be controlled
to maintain a constant chilled liquid temperature leaving
the evaporator. Prerotation vanes (PRV), located at the
entrance to the compressor impeller, compensate for
variation in load (See Detail A).
The position of these vanes is automatically controlled
through a lever arm attached to an electric motor
located outside the compressor housing. The automatic
adjustment of the vane position in effect provides the
performance of many different compressors to match
various load conditions from full load with vanes wide
open to minimum load with vanes completely closed.
Figure 2.2 YK Refrigerant Flow Diagram
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