York YK Manual page 6

FORM 160.75-EG1 (519)
Introduction (Cont'd)
SINGLE STAGE COMPRESSOR DESIGN AND EFFICIENCY PROVEN IN THE MOST
DEMANDING APPLICATIONS
Designed to be the most reliable chillers we've ever made, YORK
ers incorporate single-stage compressor design. With fewer moving parts and straight-
forward, efficient engineering, YORK
records in hospitals, chemical plants, gas processing plants, the U.S. Navy, and in other
applications where minimal downtime is a crucial concern.
In thousands of installations worldwide, YORK
reduce energy costs. High strength aluminum-alloy compressor impellers feature back-
ward curved vanes for high efficiency. Airfoil shaped pre rotation vanes minimize flow dis-
ruption for the most efficient part load performance. Precisely positioned and tightly fitted,
they allow the compressor to unload smoothly from 100% to minimum load for excellent
operation in air conditioning applications.
AHRI CERTIFICATION PROGRAM
YORK YK chillers have been tested and certified by Air-Conditioning, Heating and
®
Refrigeration Institute (AHRI) in accordance with the latest edition of AHRI Standard
550/590 (I-P). Under this Certification Program, chillers are regularly tested in strict
compliance with this Standard. This provides an independent, third-party verification of
chiller performance. Refer to the AHRI site at:
Program Scope, Inclusions, and Exclusions as some options listed herein fall outside the
scope of the AHRI certification program. For verification of certification, go to the AHRI
Directory at www.ahridirectory.org.
PRECISION CONTROL OF COMPRESSOR OIL PRESSURE
Utilizing our expertise in variable speed drive technology and applications, Johnson Con-
trols has moved beyond the fixed head and bypass approach of oil pressure control. The
old approach only assures oil pressure at the outlet of the pump rather than at the com-
pressor, and allows no adjustment during chiller operation. The YORK
a variable speed drive oil pump, monitoring and providing the right amount of oil flow to
the compressor on a continuous basis. This design also provides sophisticated electronic
monitoring and protection of the oil pump electrical supply, ensuring long life and reliable
operation of the oil pump motor. Variable speed drive technology reduces oil pump power
consumption, running only at the speed required, rather than at full head with a pressure
regulating bypass valve.
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single-stage compressors have proven durability
®
single-stage compressors are working to
®
http://www.ahrinet.org/WCCL
YK centrifugal chill-
®
for complete
YK chillers feature
®
JOHNSON CONTROLS