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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 - Green
•
Warning - Yellow
•
Cycling shutdown - Orange
•
Safety shutdown - Red
Status messages
Table 3: Status messages
Message
System Ready To Start
Cycling Shutdown – Auto
Restart
Safety Shutdown –
Manual Restart
System Unloading Before
Shutdown
System Prelube
Model YD Mod D with OptiView Control Center
Description
The chiller is shut down but will start upon receipt of a Local or Remote start signal.
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.
The chiller is shut down 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 presses the Clear Fault button on the Home screen.
Displayed while the Pre-rotation Vanes and Discharge Valves are closing during a soft
shutdown of the entire chiller. A soft shutdown is performed on the running compressors for
the following shutdowns:
•
Leaving Chilled Liquid Temperature – Low Temperature
•
Remote Stop (ISN, Analog Remote or Digital Remote)
•
Control Panel-Schedule
•
Multiunit Cycling-Contacts Open
•
System Cycling #1-Contacts Open
•
System Cycling #1-Contacts Open
•
Discharge #1-Valve Not Closed
•
Discharge #2-Valve Not Closed
•
Operator initiated at Keypad
When a soft shutdown is initiated on the entire chiller, a close command is applied to the
pre-rotation vanes. If both compressors are running, a vanes close command is applied
simultaneously to both compressors. When the vane motor switch for each compressor
closes, indicating its vanes have closed (or 3.5 minutes have elapsed, whichever occurs
first), a close command is applied to the discharge valve for the respective compressor.
When the discharge valve limit switch closes, indicating the valve has closed (or 40 seconds
have elapsed, whichever occurs first), the chiller enters coastdown. If both compressors are
running, the chiller will enter coastdown only after both discharge valves have closed or
timed out.
While the vanes are closing during a soft shutdown, if a Local stop or any faults listed above
occur, the soft shutdown is terminated and the chiller immediately enters coastdown.
A chiller start has been initiated and the pre-start lubrication is being performed on the Lead
compressor. The Prelube duration is either 50 seconds or 180 seconds, as configured with a
Microboard Program Switch. The Pre-lube duration must never be changed by anyone other
than a qualified Service Technician. The standard Prelube duration is 50 seconds.
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