YORK INTERNATIONAL
6
FORM 160.54-O2(1102)
FORM 160.54-O2(1102)
7
YORK INTERNATIONAL
starter, YORK Solid State Starter (optional), or Vari-
able Speed Drive (optional).
There could be either of two different Solid State
Starters applied. Later production chillers are
equipped with the Mod “B” Solid State Starter. This
starter contains a combination Logic/trigger Board
that interfaces the Control Center with a serial com-
munications link. Earlier vintage chillers are equipped
with the Mod “A” Solid State Starter. This starter con-
tains a Trigger Board that interfaces to a Logic Board
that is installed inside of the Control Center.
Chillers that are equipped with “P” Compressors have
certain component variances. These variances are
noted in the appropriate sections of this book. They
have a different Condenser High Pressure Safety
Cutout Switch (HPCO) than supplied on other com-
pressor applications. This switch is mounted on the
condenser shell but has a different wiring interface to
the I/O Board and Motor Controller circuit. Refer to
SECTION 1
DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION
00116vip
CONDENSER
CONTROL
CENTER
COMPRESSOR
MOTOR
EVAPORATOR
FIG. 1 –
MODEL YK
MAXE
TM
CHILLER
SYSTEM OPERATION DESCRIPTION (SEE FIG. 2)
The YORK Model YK MaxE
TM
Chiller is commonly
applied to large air conditioning systems, but may be
used on other applications. The chiller consists of an
open motor mounted to a compressor (with integral
speed increasing gears), condenser, evaporator and vari-
able flow control.
The chiller is controlled by a modern state of the
art Microcomputer Control Center that monitors its
operation. The Control Center is programmed by the
operator to suit job specifications. Automatic timed
start-ups and shutdowns are also programmable to
suit nighttime, weekends, and holidays. The operating
status, temperatures, pressures, and other information
pertinent to operation of the chiller are automatically
displayed and read on a graphic display. Other displays
can be observed by pressing the keys as labeled on the
Control Center. The chiller with the OptiView Con-
trol Center is compatible with an electro-mechanical
