JOHNSON CONTROLS
14
FORM 161.01-OM1
ISSUE DATE: 6/8/2018
SECTION 1 - SYSTEM FUNDAMENTALS
The graphic display can display data in either English
or Metric mode.
• English (temperatures in °F and pressures in
PSIA)
• Metric (temperatures in °C and pressures in kPa)
The control center continually monitors system opera-
tions. Operators are advised of chiller conditions by
use of various status and warning messages. This data
is recorded and preserved in memory even through a
power failure. Operational data, warnings and shut-
down messages may be viewed at any time.
In addition, the control center may use alarms to no-
tify the user of certain conditions. A complete listing of
shutdown, status, and warning messages is listed in the
Display Messages on page 90 of this manual.
The control center includes capabilities for remote con-
trol and communications. Common networking proto-
col through the Building Automation System (BAS) al-
lows increased remote control of the chiller, as well as
24-hour performance monitoring via a remote site. An
optional circuit board called the SC-EQUIP provides
Johnson Controls and YORK mechanical equipment
such as the YZ chiller with building automation system
(BAS) networking connectivity.
The chiller also maintains standard digital remote ca-
pabilities. Both of these remote control capabilities al-
low for the following standard Energy Management
System (EMS) interfaces. The actual connection de-
tails are in the Field Connections section of the Wiring
Diagram (Form 161.01-PW1 and PW3):
• Remote Start
• Remote Stop
• Remote Leaving Chilled Liquid Temperature
Setpoint adjustment: BAS coms, Analog signal,
(0-10VDC or 4-20mA) or Pulse Width Modula-
tion
• Remote Current Limit Setpoint adjustment: BAS
coms, Analog signal, (0-10VDC or 4-20mA) or
Pulse Width Modulation
• Remote “Ready to Start” Contacts
• Safety Shutdown Contacts
• Cycling Shutdown Contacts
The OptiView panel can be used to control the cus-
tomer chilled and condenser liquid flow. A set of con-
tacts exists to initiate flow for each shell. Details are in
the Field Connections section of the Wiring Diagram
(Form 161.01-PW2 and PW4). The chilled water pump
contacts close immediately upon execution of a chiller
start command. They open coincident with the receipt
of a stop command or a fault other than those below:
A. LEAVING CHILLED LIQUID - LOW TEM-
PERATURE cycling shutdown.
B. MULTIUNIT CYCLING - CONTACTS OPEN
or SYSTEM CYCLING - CONTACTS OPEN
(Only if Chilled Liquid Pump Operation is set to
ENHANCED)
C. LEAVING CHILLED LIQUID FLOW SWITCH
OPEN cycling shutdown
The Condenser Pump contacts close immediately upon
execution of a chiller start command. They open coin-
cident with receipt of a chiller stop command or fault
other than CONDENSER-FLOW SWITCH OPEN cy-
cling shutdown.
If the chiller is stopped and the condenser pump con-
tacts are open (flow off), the contacts close when satu-
rated condenser temperature is less than 35.0 °F (1.67
°C). This helps mitigate condenser freeze due to plant
issues in brine applications.
If the contacts are closed only due to the saturated con-
denser temperature, they are opened when saturated
condenser temperature returns above 40.0 °F (4.44
°C). If the existing logic calls for them to be closed,
they remain closed.
Some screens, displayed values, programmable
setpoints and manual controls exist for service techni-
cian use only. They are only displayed when logged in
at SERVICE access level or higher. These parameters
affect chiller operation and should never be modified
by anyone other than a qualified service technician.
The chiller operating program resides in the Opti-
View Control Center microboard. Software versions
(Y.OPT.01.xx.yzz) are alpha-numeric codes that rep-
resent the application, language package and revision
levels as follows.
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