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FORM 160.72-O1 (810)
JOHNSON CONTROLS
20
HOME SCREEN
The OPERATOR access level reverts to the VIEW
level after 10 continuous minutes without a keypress.
SERVICE: In the event that advanced diagnostics are
necessary, a SERVICE access level has been provid-
ed. Only qualified service personnel utilize this access
level. This level provides advanced control over many
of the chiller functions and allows calibration of many
of the chiller controls. The access levels are listed
above in hierarchical order beginning with the lowest
level and proceeding to the highest level. Users logged
in under higher access levels may perform any actions
permitted by lower access levels.
The
OPERATOR
access level is accompanied by a
10-minute timeout. After ten (10) successive minutes
without a keypress, the panel will revert to the VIEW
access level. This prevents unauthorized changes to the
chiller if a user was logged in at a higher access level
and failed to logout. Proper procedure requires that
after making necessary setpoint adjustments the user
return to the Home Screen and logout.
logout
Access Level Required: OPERATOR
This key is displayed when a user is logged in at any
level other than
VIEW
. Pressing it will return the ac-
cess level to
VIEW
.
print
Access Level Required: VIEW
Use this key to generate a hard-copy report of the
present system status. This provides a snapshot of the
primary operating conditions at the time the key is
pressed. The History page provides enhanced report-
ing capability. (See HISTORY below.)
Message Clear
Access Level Required: SERVICE
When certain safety or cycling conditions have been
detected and the chiller has been shutdown, the main
status display of the chiller will continue to display a
message indicating the cause of the shutdown. Using
this key, the message can be cleared once the condition
has been removed.
navigaTion
system
Used to provide additional system information.
evaporator
A detailed view of all evaporator parameters, including
the programmable Leaving Chilled Liquid Setpoints.
Condenser
A detailed view of all condenser parameters, including
control of the purge functions.
Compressor
A detailed view of all the compressor parameters. This
includes Hot Gas Bypass Control and the compressor
lubrication system.
Motor
A detailed view of the motor controller parameters,
specific to the controller type presently utilized on the
chiller system. This allows programming of the Cur-
rent Limit and the Pulldown Demand Limit values.
Capacity Controls
The primary control of the chiller is shown on this
screen that includes the temperature control, motor lim-
it control, pressure overrides, and anti-surge setpoints.
It also provides access to the majority of setpoints,
alarms, and trips for the system, as well as the PID tun-
ing and calibration of actuators.
setup
This screen displays the current configuration of the
system and provides for changing options such as tem-
perature sensors, flow transmitters, and valves. It is
also the gateway to many of the general system setup
parameters such as Date/Time, Display Units, Printer
Setup, etc.
history
This screen provides access to a snapshot of system
data at each of the last 10 shutdown conditions, all
trending functions and custom screens.