JOHNSON CONTROLS
11
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
1
SECTION 1 - SYSTEM FUNDAMENTALS
SYSTEM COMPONENTS
The YORK Model YMC
2
Centrifugal Liquid Chiller
is completely factory-packaged including evapora-
tor, condenser, compressor, motor, Variable Speed
Drive, Battery Power Panel, OptiView
TM
Control
Center, and all interconnecting unit piping and wir-
ing (see Figure 1).
Compressor
The compressor is a single-stage centrifugal type pow-
ered 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 com-
pressor impeller is overhung from the end of the motor
shaft and has no bearings of it's 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 proper shaft posi-
tion 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.
Evaporator
The evaporator is a shell and tube, hybrid falling film,
and flooded type heat exchanger. A distributor trough
provides uniform distribution of refrigerant over tubes
in the falling film section. Residual refrigerant floods
the tubes in the lower section. Suction baffles are locat-
ed above the tube bundle to prevent liquid refrigerant
carryover into the compressor. A 2" liquid level sight
1
FIGURE 1 - YMC
2
CHILLER COMPONENTS
LD14022b
COMPRESSORTRANSFORMERS
OPTIVIEW
CONTROL
PANEL
CONDENSER
EVAPORATOR
VSD
COOLING
PIPING
COMPACT
WATERBOXES
VARIABLE
SPEED
DRIVE
DIRECT-DRIVE
MOTOR
MAGNETIC
BEARING
CONTROLLER
LIFTING
OPENINGS
POWER
PANEL
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