FORM 160.84-EG1 (617)
JOHNSON CONTROLS
7
RELIABILITY
Designed for the most reliable chillers we have ever made, the YMC² YORK Magnetic
Bearing Compressor will achieve a much better performance because it is based on a
successful line of efficient YORK single-stage compressors. With fewer moving parts and
straightforward design, YORK single-stage compressors have proven durability in numer-
ous applications, especially applications where minimal downtime is a critical concern.
The YMC² chiller is driven by a Johnson Controls OptiSpeed™ variable-speed drive
(VSD) to ensure optimal Real-World performance especially at part-load conditions. First,
the OptiSpeed is designed with a standard, factory-packaged, active front end to ensure
the % current Total Demand Distortion (TDD) is kept below 5% and that a chiller displace-
ment power factor of at least 0.97 is maintained in order to help your building comply with
the guidelines of IEEE-519. Second, to ensure equipment safety and longevity, this chiller
is equipped with the option of either a circuit breaker or a disconnect switch. Third, volt-
age options of 380V and 460V (60Hz), 400V and 415V (50Hz) are available to serve our
global customers.
YMC² chillers are designed to keep installation costs low. Where installation access is
not a problem, the unit can be shipped completely packaged including the unit-mounted
OptiSpeed VSD, requiring minimal piping and wiring to complete the installation.
The majority of chiller components on the YMC² chillers have been time tested on the
tens of thousands of YK chillers operating globally. The YMC² chiller employs the most
advanced drive available - an active magnetic-bearing drive - to levitate the driveshaft.
The result is frictionless operation and fewer moving parts subject to breakdown, which is
why we have used this magnetic drive in our mission-critical chillers since 1998.
The YMC² chiller incorporates service design principles that are consistent with our Model
YK 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.
Introduction (Cont'd)
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