York YR Manual page 87

FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
in Digital Remote mode via I/O Board TB4-7/8 or in
ISN (Integrated Systems Network) Remote mode via
the MicroGateway serial communications. If the chiller
is running when this occurs, the Pre-rotation Vanes are
driven fully closed prior to shutting down the chiller.
LOCAL STOP
A local shutdown command has been received by plac-
ing the Keypad Start-Run-Stop/Reset Switch in the
stop (O) position.
PLACE COMPRESSOR SWITCH IN RUN POSITION
The Control Center is in either Digital or ISN (Inte-
grated Systems Network) Remote mode. The operator
is requested to place the COMPRESSOR switch in the
RUN position. The Control Center will not accept a
Remote start/stop command unless the switch is in the
RUN position.
CYCLING SHUTDOWN MESSAGES
MULTIUNIT CYCLING – CONTACTS OPEN
The Multi-Unit Cycling contacts connected to I/O
Board TB4-9, have opened to initiate a cycling shut-
down. If the chiller is running when this occurs, the
slide valve is fully unloaded prior to shutting down the
chiller. The chiller will automatically restart when the
contacts close.
SYSTEM CYCLING – CONTACTS OPEN
The System Cycling contacts connected to I/O Board
TB4-13, have opened to initiate a cycling shutdown. If
the chiller is running when this occurs, the slide valve
is fully unloaded prior to shutting down the chiller.
The chiller will automatically restart when the contacts
close.
CONTROL PANEL – POWER FAILURE
A Control Power failure has occurred. If the power
failure occurred while the chiller was running, it will
automatically restart when power is restored. This
message can indicate a Cycling (auto-restart after pow-
er failure) or Safety (manual restart after power failure)
shutdown, depending upon Control Center configura-
tion. It indicates a cycling shutdown when displayed
in orange characters; safety shutdown when displayed
in red characters. The Control Center is configured for
auto-restart or manual restart after power failure by a
qualified Service Technician following instructions in
OptiView Control Center Service Instructions (Form
160.81-M1).
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
LEAVING CHILLED LIQUID –LOW TEMPERATURE
The Leaving Chilled Liquid Temperature has decreased
to the programmed Shutdown Temperature setpoint. If
the chiller is running when this occurs, the slide valve
is fully unloaded prior to shutting down the chiller. The
chiller will automatically restart when the tempera-
ture increases to the programmed Restart Temperature
setpoint.
LEAVING CHILLED LIQUID – FLOW SWITCH OPEN
The Chilled Liquid Flow Switch has remained open
for 2 continuous seconds while the chiller was running
or failed to close during the Start Sequence Initiated
period. The chiller will automatically restart when the
Flow Switch closes.
CONDENSER – FLOW SWITCH OPEN
The Condenser Water Flow Switch has remained open
for 2 continuous seconds while the chiller was run-
ning. With software version C.MLM.05.06.xxx (and
later) or C.OPT.05.06.xxx (and later), this check is
bypassed until the PUMP DELAY setpoint timer has
been elapsed for at least 30 seconds. With all previous
software, this check is bypassed for the first 30 seconds
of "System Run". The chiller will automatically restart
when the Flow Switch closes.
The CM-2 Current module (Electro-Mechanical Start-
er applications) has shutdown the chiller. When detect-
ing a fault condition that places the starter or motor at
risk, these devices open the Motor Controller contacts
"CM" (located on the respective device and connected
between TB6-16 and TB6-53 in the Control Center) to
initiate a shutdown. Since there are several different
faults that are monitored, LEDs on the respective de-
vice illuminate to identify the specific fault that has oc-
curred. The chiller will automatically restart when the
Motor Controller contacts close. On some shutdowns,
the respective device automatically closes the contacts
when the fault condition clears. Other shutdowns re-
quire the operator to perform a Manual Reset at the
respective device.
MANUAL
DEVICE
RESET FAULT
CM-2 Module Overload
3
AUTOMATIC RESET
FAULT
None
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