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YORK INTERNATIONAL
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TABLE OF CONTENTS
GENERAL INFORMATION ........................................................................... 2
UNIT NOMENCLATURE ............................................................................... 3
OPERATIONAL LIMITATIONS....................................................................... 7
PHYSICAL DATA ......................................................................................... 8
DIMENSIONS .............................................................................................. 9
ELECTRICAL DATA .................................................................................... 10
INSTALLATION ........................................................................................... 12
MASTER MODULE WIRING DIAGRAM ..................................................... 20
SLAVE MODULE WIRING DIAGRAM ........................................................ 26
UNIT CONTROLS AND OPERATION .......................................................... 32
COMPRESSOR CAPACITY CONTROL ..................................................... 77
SYSTEM START-UP CHECKLIST / REPORT............................................. 78
PREVENTATIVE MAINTENANCE .............................................................. 82
OPTIONS ................................................................................................... 83
TROUBLESHOOTING CHART.................................................................... 96
GENERAL INFORMATION
GENERAL DESCRIPTION
YDA packaged liquid chillers are completely self-con-
tained outdoor units shipped ready for final job installa-
tion requiring only liquid connections, and power and
control wiring. They are designed primarily for central
station air conditioning applications with normal instal-
lations being on roof-tops or at ground level beside the
building.
The chiller package is composed of two modules, each
controlled by its own microprocessor with one module
being designated as the “Master” and one module as
the “Slave.” Each module consists of a microprocessor
panel, power panel, evaporator, condenser, contactors,
fans, and two compressors (each with 2 stages of load-
ing) in separate refrigerant circuits. An RS-485 com-
munications link between the two microprocessors per-
mits a Master/Slave operation with a single operator
control point.
CODE STATUS
The units are designed in accordance with U.L. (200,
230, 460-3-60), N.E.C., ASHRAE/ANSI STANDARD 15,
and ASME codes.