System fundamentals
System components
The YORK Model YMC
2
Centrifugal Liquid Chiller is completely factory-packaged including
evaporator, condenser, compressor, motor, variable speed drive, battery power panel, OptiView
™
Control Center, and all interconnecting unit piping and wiring (see Figure 5).
Figure 5: YMC
2
chiller components
Compressor
The compressor is a single-stage centrifugal type powered by a hermetic electric motor, on a
common shaft with a cast aluminum, fully shrouded impeller. The compressor has fixed inlet vanes
and variable geometry diffuser.
Motor
The compressor motor is a hermetic permanent magnet high speed design with magnetic
bearings. The compressor impeller is overhung from the end of the motor shaft and has no
bearings of its own.
The motor includes angular contact ball bearings only engaged with the rotor shaft during
shutdown after rotation is stopped or during shutdown due to loss of power to the magnetic
bearings.
The bearing control center maintains correct shaft position in the magnetic bearings.
Heat exchangers
Evaporator and condenser shells are fabricated from rolled carbon steel plates with fusion welded
seams. Heat exchanger tubes are internally enhanced type.
11
YMC
2
Mod B with OptiView
™
Control Center
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