Johnson Controls York YKEP Series User Manual

FORM 160.77-O2
ISSUE DATE: 11/15/2011
JOHNSON CONTROLS
17
22
SECTION 2 - YKEP CONTROL CENTER INTRODUCTION
YKEP CONTROL CENTER
The YKEP Control Center is a fully integrated system
that monitors and controls all aspects of the chiller’s
components (see Figure 1 on Page 7) and opera-
tion. It provides all the necessary controls and control
logic to facilitate automatic start-up, automatic opera-
tion, capacity control, and safety protection. The Con-
trol Center has two components - the Logic Controller
and the Human-Machine Interface (HMI):
Logic Controller
The logic controller is a stand-alone Allen-Bradley
1769-L35E Compact Logix Programmable Automa-
tion Controller (PAC) (see Figure 7 on Page 17).
• The PAC controls all aspects of machine operation
by monitoring vital parameters and making real-
time adjustments as necessary to ensure safe and
efcient operation of system components.
LD15302
FIGURE 7 - LOGIC CONTROLLER
Control Panel
The control panel is a RedLion Controls Model
G310C230 10.4” color active matrix touchscreen dis-
play with seven front-panel push-buttons and three
front-panel LEDs (see Figure 8 on Page 17). The
control panel is a factory wired, unit mounted, NEMA
12, gasketed enclosure.
• The panel displays real-time chiller sensor data
via the PAC and allows for manual adjustments to
operational parameters.
FIGURE 8 - CONTROL PANEL
LD15303
OPERATOR INTERFACE
Operators access the chiller control system through
full-color screens that display real-time data from all
control system sensor points (see Figure 9 on Page
19) and are equipped with both sensor history log-
ging and complete alarm/system trip history features.
YKEP CONTROL CENTER FEATURES
The Control Center for YKEP is a Programmable Au-
tomation Controller (PAC) based control system for
YORK R134a centrifugal chillers. It controls the leav-
ing chilled liquid temperature and maintains required
pressure to avoid surge via pre-rotation vane controls,
motor drive speed and optional hot gas bypass. It has
the ability to limit motor current and shell pressures.
The Control Center comes configured with a full 10.4”
screen LCD touchscreen Graphic Display. The graphic
display allows the presentation of several operating pa-
rameters at once. In addition, the operator may view a
graphical representation of the historical operation of
the chiller as well as the present operation. For the nov-
ice user, the locations of various chiller parameters are
clearly and intuitively marked. Instructions for specific
operations are provided on many of the screens.
The graphic display also allows information to be rep-
resented in both English (temperatures in °F and pres-
sures in PSIG) and Metric (temperatures in °C and
pressures in BAR) mode. The advantages are most

Johnson Controls York YKEP Series Specifications

General

Brand	Johnson Controls
Model	York YKEP Series
Category	Chiller
Language	English