FORM 155.21-O1 (615)
51
JOHNSON CONTROLS
2
DISPLAY MESSAGES
The Status Bar of the Display contains a Status Line
and, beneath it a Details Line. The Status Line contains
a message describing the operating state of the chiller;
whether it is stopped, running, starting or shutting down.
The Details Line displays Warning, Cycling, Safety,
Start Inhibit and other messages that provide further
details of the Status Bar messages. The Status Messages
listed below are displayed on the Status Line. All other
messages are displayed on the Details Line.
To aid in the meaning of the message, messages are
displayed in different colors as follows:
Normal Operation messages - Green
Warning messages - Yellow
Cycling Shutdown messages - Orange
Safety Shutdown messages - Red
Status Messages
System Ready to Start
The chiller is shut down but will start upon receipt of a
Local or Remote start signal.
System Starting
A chiller start has been initiated and the control is per-
forming pre-run checks.
System Running
The chiller is running under the condition described in
the Details Line of the Status Bar.
Cycling Shutdown – Autostart
The chiller is shut down on a CYCLING shutdown. The
cause of the shutdown is still in effect and is displayed
on the Details line of the Status Bar. The chiller will
automatically restart when the CYCLING condition
clears.
Safety Shutdown – Reset to Restart
The chiller is shutdown on a SAFETY shutdown. The
cause of the shutdown is still in effect and is displayed
on the Details line of the Status Bar. The chiller can be
started after the Safety condition clears and the Operator
is required to press the WARNING RESET key in OP
-
ERATOR or SERVICE access to clear the warning.
System Start Inhibited
The chiller is prevented from being started due to the
reason displayed on the Details Line of the Status bar.
Run Messages
ADC in progress - load Limit to 50%
The auto-decrystallization process is triggered when
the temperature sensed by RT2 is greater than 160°F
(71.1°C).
This process sets the valve opening to 50% to decrease
the concentration in the solution, and opens 2SOL valve
2 minutes every 10 minutes. If the 3F level switch opens
the auto-decrystallization process stops and starts a
limited auto-decrystallization process. The unit verifies
the temperature in RT2 every 10 minutes, if it is less
than 150°F (65.5°C), the control assumes that the unit
has been decrystallized and returns to normal operating
conditions.
Cooling Start Sequence initiated
A chiller start has been initiated and the control is per-
forming pre-run checks.
Dilution Cycle is in progress
The system is in dilution. The chiller pumps will run and
require chilled liquid and condenser liquid flow with the
control valve closed until the dilution timer expires. The
Stabilizer Valve (2SOL) will open as required.
High Concentration Control in effect
The system is running in LOCAL or REMOTE mode.
Loading is limited by the strong solution concentration
compared to the solution temperature leaving the solu-
tion-to-solution heat exchanger (RT10). Concentration
is calculated using strong solution temperature (RT3)
and refrigerant from from the condenser temperature
(RT9).
Leaving Chilled Liquid Temperature Control
in effect
The system is running in LOCAL or REMOTE mode.
The loading and unloading is being automatically
controlled by the leaving chilled liquid temperature
setpoint.
Limited Dilution Cycle is in progress
A limited dilution cycle is performed when the control
calls for dilution, and a dilution cycle can NOT be
performed, due to loss of power for the chiller pumps.
It only applies when backup power is supplied for the
solution pump.
