YZ Engineering Guide
Form: 161.01-EG1 (0618)
RELIABILITY
Designed for the most reliable chillers we have ever made, the YORK® YZ magnetic bearing compressor achieves
superior performance because it is based on a successful line of efficient YORK® compressors. With fewer moving parts,
YORK® compressors have proven to be durable in numerous applications, especially where minimal downtime is a
critical concern. The lubrication-free, non-contact design of the YORK® YZ provides system simplicity and reliability that
far exceeds continuous-contact-oil and refrigerant-lubricated bearing chiller designs.
The majority of chiller components on YZ chillers have been time tested on the tens of thousands of air-cooled and water-
cooled YORK® chillers operating globally. The YZ chiller employs the most advanced driveline available - an active
magnetic-bearing drive to levitate the driveshaft. The result is frictionless operation and 80% fewer moving parts than
oil-lubricated or refrigerant-lubricated systems, which is why we have used this type of driveline in our mission-critical
chillers since 1998.
The YZ chiller incorporates service design principles that are consistent with our family of centrifugal chillers. We made
sure that this chiller, and specifically the driveline, was field serviceable by a single source supplier, who also happens
to be the industry’s largest service force: our own Johnson Controls service team.
AHRI CERTIFICATION PROGRAM
The performance of the YZ chiller has been certified by the Air Conditioning, Heating and Refrigeration Institute (AHRI)
as complying with the certification sections of the latest issue of AHRI Standard 550/590. Under this Certification
Program, chillers are regularly tested in strict compliance with this Standard. This provides an independent, third-party
verification of chiller performance.
COMPUTERIZED PERFORMANCE RATINGS
Each chiller is custom-matched to meet the individual building load and energy requirements. A variety of standard heat
exchangers and pass arrangements are available to provide the best possible match.
It is not practical to provide tabulated performance for each combination, as the energy requirements at both full- and
part-load vary significantly with each heat exchanger and pass arrangement. Computerized ratings are available through
each Johnson Controls sales office. Each rating can be tailored to a specific job requirement, and is part of the AHRI
Certification Program.
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