4 YORK INTERNATIONAL
7619A(D)
DETAIL A – COMPRESSOR PREROTATION VANES
full load design conditions. However, most systems
will be called upon to deliver full load capacity for only
a relatively small part of the time the unit is in opera-
tion.
CAPACITY CONTROL
The major components of a CodePak are selected for
full load capacities, therefore capacity must be con-
trolled to maintain a constant chilled liquid tempera-
ture leaving the cooler. Prerotation vanes (PRV), lo-
cated at the entrance to the compressor impeller, com-
pensate for variation in load (See Fig. 2. Detail A).
The position of these vanes is automatically controlled
through a lever arm attached to an electric motor lo-
cated 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.
FIG. 2 – REFRIGERANT FLOW-THRU CODEPAK
LD01066
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