7619A(D)

DETAIL A – COMPRESSOR PREROTATION VANES

FORM 160.49-O2

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 operation.

CAPACITY CONTROL

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 cooler. Prerotation vanes (PRV), located at the en- trance to the compressor impeller, compensate for varia- tion 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.

COMPRESSOR

PREROTATION VANES (See Detail A)

DISCHARGE

SUCTION

DISCHARGE

BAFFLE

COOLER

CONDENSER

ELIMINATOR

SUB-COOLER

FLOW CONTROL

ORIFICE

LD00924

FIG. 2 – REFRIGERANT FLOW-THRU CHILLER

OIL COOLER

YORK INTERNATIONAL

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York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 Detail a Compressor Prerotation Vanes, Capacity Control

YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4, YK M3 M3 G4 specifications

The York YK M3 M3 G4, YK M3 M3 G4 THRU YK S6 S4 J2, and YK LB LB G4 THRU YK SE SC J4 represent a sophisticated line of HVAC systems engineered for modern commercial applications. These models are celebrated for their innovative designs, energy efficiency, and advanced features, making them a preferred choice among facility managers and building owners.

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