Johnson Controls York YKEP Series User Manual

FORM 160.77-O2
ISSUE DATE: 11/15/2011
JOHNSON CONTROLS
18
SECTION 2 - YKEP CONTROL CENTER INTRODUCTION
apparent, however, in the ability to display many lan-
guages.
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 mes-
sages. 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 controls shown in this book
that are for Service Technician use only. They are only
displayed when logged in at SERVICE access level or
higher. The Setpoints and parameters displayed on these
screens are explained in detail in YKEP Unit Service
(Form 160.77-M1). These parameters affect chiller op-
eration 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 YKEP Control-
Center Service (Form 160.77-M2). Also included in the
Service manual are detailed descriptions of chiller fea-
tures, such as the Refrigerant Level Control, Hot Gas
Bypass, Remote Setpoints, and Variable Geometry Dif-
fuser.
The control center expands the capabilities of remote
control and communications. By providing a common
networking protocol through the Modbus RTU, YORK
Chillers not only work well individually, but also as a
team. This network 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 BAS commu-
nications. 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 (4-20mA)
4. Remote Current Limit Setpoint adjustment
(4-20mA)
5. Remote “Ready to Start” Contacts
6. Safety Shutdown Contacts
7. Cycling Shutdown Contacts
TABLE 1 - YKEP CONTROL SYSTEM SENSORS
SENSOR DESCRIPTION
FSLL-100 Evaporator Chilled Liquid Flow Switch
FSLL-103 Condenser Water Flow Switch
LCV-114 Subcooler Level Valve Actuator
LCV-116 Economizer Level Valve Actuator
LE-114 Subcooler Refrigerant Level Sensor
LE-116 Economizer Level Sensor
PCV-112A Open/Close Primary Compressor VGD
PCV-112B Open/Close Primary Compressor VGD
PE-111 Evaporator Refrigerant Pressure
PE-113 Condneser Refrigerant Pressure
PE-116 Economizer Refrigerant Pressure
PE-140 Oil Sump Pressure
SENSOR DESCRIPTION
PE-141A Primary Compressor Oil Pump Pressure
PE-141B Economizer Compressor Oil Pump Pressure
PE-149A Primary Compressor Discharge Pressure
PE-149B Economizer Compressor Discharge Pressure
PSHH-113A
* Primary Compressor High Discharge
Pressure Cutout
PSHH-113B
* Economizer Compressor High Discharge
Pressure Cutout
PWM1 Primary Compressor Oil Pump Speed
PWM2 Economizer Compressor Oil Pump Speed
RST-100 Leaving Chilled Liquid Remote Setpoint
RST-160 Remote Demand Limit

Johnson Controls York YKEP Series Specifications

General

Brand	Johnson Controls
Model	York YKEP Series
Category	Chiller
Language	English