JOHNSON CONTROLS
11
FORM 160.67-O2
ISSUE DATE: 10/9/2020
1
SECTION 1 - DESCRIPTION OF SYSTEM AND
FUNDAMENTALS OF OPERATION
• Power panel.
• Control center.
The complete chiller system can be shipped in several
different arrangements, See Form 160.67-N2.
Typically major system components are factory-
packaged including all interconnecting unit piping and
wiring. The steam condenser package is shipped sepa-
rately suitable for direct mounting onto the chiller or
mounting along-side.
The initial charge of refrigerant and oil is supplied for
each chiller. When the optional refrigerant condenser
isolation valves are ordered, the unit may ship fully
charged with refrigerant and oil. Actual shipping pro-
cedures will depend on a number of project-specific
details.
GENERAL SYSTEM DESCRIPTION
The YORK Model YST Chiller is a factory assembled
steam turbine driven centrifugal compressor chiller.
It is commonly applied to large air conditioning sys-
tems, (700 through 2165 Tons), but may be used on
other chiller applications. The YST chiller operates on
Refrigerant R-134a and is designed only for NEMA 1
indoor installation or a weather protected warm envi-
ronment.
The system consists of the following major equipment
components:
• York® single-stage centrifugal compressor with
internal speed increasing gear.
• Steam turbine, direct connected.
• Refrigerant evaporator.
• Refrigerant condenser.
• Steam condenser package.
• Lubrication systems for compressor and turbine.
FIGURE 1 - MODEL YST CHILLER
EVAPORATOR
CONDENSER
COMPRESSOR
STEAM TURBINE
CONTROL CENTER
STEAM CONDENSER
PACKAGE
ATMOSPHERIC RELIEF
VALVE
HOTWELL PUMPS
GOVERNOR VALVE
HOT GAS BYPASS
VALVE
VACUUM PUMPS
POWER PANEL
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