York YCAV0157 Installation Operation & Maintenance page 225

Multiple STATUS messages may appear and can be
viewed by pressing the STATUS key repeatedly to allow
scrolling through as many as three STATUS messages,
that could possibly be displayed at any time on a 2 com-
pressor chiller or 4 messages that could be displayed on
a 3 or 4 compressor chiller.
Examples of the typical Status messages are shown
below:
General Status Messages
UNIT STATUS
MANUAL OVERRIDE
This message indicates the chiller is operating in
MANUAL OVERRIDE mode. This message is a pri-
ority message and cannot be overridden by any other
STATUS message. When in Manual Override, no other
status message will ever be present.
UNIT STATUS
UNIT SWITCH OFF SHUTDOWN
This message indicates the UNIT SWITCH is in the off
position and not allowing the unit to run.
UNIT STATUS
DAILY SCHEDULE SHUTDOWN
This message indicates that either the daily or holiday
schedule programmed is keeping the chiller from run-
ning.
UNIT STATUS
REMOTE CONTROLLED SHUTDOWN
This message indicates that either an ISN or RCC has
turned the chiller off and is not allowing it to run.
UNIT STATUS
FLOW SWITCH SHUTDOWN
This message indicates the flow switch is not allowing
the chiller to run. There is a 1 second delay on this safety
to assure the flow switch did not momentarily open.
JOHNSON CONTROLS
STATUS KEY (CON'T)
UNIT STATUS
VSD COOLING SHUTDOWN
This message indicates the chiller is shutdown, but
running all the condenser fans, VSD glycol pump, and
VSD fan in an effort to bring the internal VSD ambient
temperature down to an acceptable level before allowing
the chiller to start.
SYS X REMOTE RUN CONTACT IS OPEN
This message indicates the remote start/stop contact is
open. There is a 1 second delay on this safety to assure
the remote contacts did not momentarily open.
SYS X SYSTEM SWITCH IS OFF
This message indicates the system switch (software
via keypad) is turned off. The system will not be al-
lowed to run until the system switch is turned ON via
the keypad.
SYS X NOT RUNNING
This message indicates the system is not running because
the chilled liquid is below the setpoint or the micro has
not loaded the lead system far enough into the loading
sequence to bring the lag system on. This message will
be displayed on the lag system until the loading sequence
is ready for the lag system to start.
SYS X COOLING DEMAND SHUTDOWN
This message is only displayed in the Normal Shut-
down History display to indicate a capacity control
shutdown.
SYS X COMPRESSOR RUNNING
This message indicates the system is running as a result
of cooling demand.
FORM 201.21-NM1 (1223)
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