Johnson Controls YORK YK MaxE Operation Manual page 7

desCriptioN of sYsteM aNd fUNdaMeNtaLs of operatioN
CONDENSER
MaxE™
fig. 1 – MODEL Yk
sYsteM operatioN desCriptioN (see fig. 2)
The YORK Model YK MaxE™ Chiller is commonly ap-
plied 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 variable flow control.
The chiller is controlled by a modern state of the art Mi-
crocomputer Control Center that monitors its operation.
The Control Center is programmed by the operator to suit
job specifications. Automatic timed start-ups and shut-
downs are also programmable to suit nighttime, week-
ends, 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 Control Center is applied with
an electro-mechanical starter, YORK Solid State Starter
(optional), or Variable Speed Drive (optional).
JOHNSON CONTROLS
seCtioN 1
COMPRESSOR
CONTROL
CENTER
CHILLER
EVAPORATOR
When the compressor motor is driven by a YORK Solid
State Starter, one of three different Starters could be ap-
plied. Later production chillers are equipped with either
the Style B Liquid Cooled Solid State Starter (LCSSS)
or the Medium Voltage Solid State Starter (MVSSS).
Earlier vintage chillers are equipped with the Mod "A"
Solid State Starter. This starter contains a Trigger Board
that interfaces to a Logic Board that is installed inside of
the Control Center.
When the compressor motor is driven by a YORK Vari-
able Speed Drive, there could be a Variable Speed Drive
(VSD) or a Medium Voltage Variable Speed Drive (MV
VSD) applied.
In operation, a liquid (water or brine to be chilled) flows
through the cooler, where boiling refrigerant absorbs heat
from the liquid. The chilled liquid is then piped to fan
coil units or other air conditioning terminal units, where
it flows through finned coils, absorbing heat from the
air. The warmed liquid is then returned to the chiller to
complete the chilled liquid circuit.
FORM 160.54-O1
MOTOR
00611vip
7