Johnson Controls YORK YK MaxE Operation Manual page 11

The YORK OptiView Control Center is a micropro-
cessor based control system for R-22 or R134a cen-
trifugal chillers. It controls the leaving chilled liquid
temperature via pre-rotation vane controls and has the
ability to limit motor current via control of the pre-ro-
tation vanes. It is compatible with YORK Solid State
Starter (optional), Variable Speed Drive (optional), and
Electro-Mechanical starter applications.
The panel comes configured with a full screen LCD
Graphic Display mounted in the middle of a keypad
interface. The graphic display allows the presentation
of several operating parameters 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 novice 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 repre-
sented in both English (temperatures in °F and pressures
in PSIG) and Metric (temperatures in °C and pressures in
kPa) mode. The advantages are most apparent, however,
in the ability to display many languages.
The Control Center continually monitors the system op-
eration and records the cause of any shutdowns (Safety,
Cycling or Normal). This information is recorded in
memory and is preserved even through a power failure
condition. The user may recall it for viewing at any
time. During operation, the user is continually advised
of the operating conditions by various status and warning
messages. In addition, it may be configured to notify the
user of certain conditions via alarms. A complete listing
of shutdown, status, and warning messages is attached
in the Display Messages section of this book.
There are certain screens, displayed values, program-
mable Setpoints and manual control shown in this book
that are for Service Technician use only. They are only
displayed when logged in at SERVICE access level
JOHNSON CONTROLS
seCtioN 2
optiVieW CoNtroL CeNter
iNtrodUCtioN
or higher. The Setpoints and parameters displayed on
these screens are explained in detail in YORK Service
Manual 160.54-M1. These parameters affect chiller
operation and should nEVER be modified by anyone
other than a qualified Service Technician. They are
shown in this book for reference only.
Advanced Diagnostics and troubleshooting information
for Service Technicians are included in YORK Service
Manual 160.54-M1. Also included in the Service man-
ual are detailed descriptions of chiller features, such
as the Refrigerant Level Control, Variable Speed Drive
Oil Pump, Hot Gas Bypass, High Speed Thrust Bear-
ing Proximity Probe, Remote Setpoints, Smart Freeze
Protection, and Standby Lubrication.
The control center expands the capabilities of remote
control and communications. By providing a common
networking protocol through the ISN, YORK Chillers
not only work well individually, but also as a team. This
new protocol allows increased remote control of the
chiller, as well as 24-hour performance monitoring via a
remote site. In addition, compatibility is maintained with
the present network of ISN communications. The chiller
also maintains the standard digital remote capabilities
as well. Both of these remote control capabilities allow
for the standard Energy Management System (EMS)
interface:
1. Remote Start
2. Remote Stop
3. Remote Leaving Chilled Liquid Temperature
Setpoint adjustment (0-10VDC, 2-10VDC, 0-20mA
or 4-20mA) or Pulse Width Modulation
4. Remote Current Limit Setpoint adjustment
(0-10VDC, 2-10VDC, 0-20mA or 4-20mA) or Pulse
Width Modulation
5. Remote "Ready to Start" Contacts
6. Safety Shutdown Contacts
7. Cycling Shutdown Contacts
FORM 160.54-O1
2
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