Johnson Controls YORK YK MaxE - CYCLING SHUTDOWN MESSAGES

FORM 160.54-O1
149
JOHNSON CONTROLS
2
CYCLING SHUTDOWN MESSAGES
“MULTIUNIT CYCLING – CONTACTS OPEN”
The Multiunit Cycling contacts connected to I/O Board
TB4-9, have opened to initiate a cycling shutdown. If
the chiller is running when this occurs, the Pre-rotation
Vanes are driven fully closed 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 Pre-rotation
Vanes are driven fully closed prior to shutting down the
chiller. The chiller will automatically restart when the
contacts close.
“OIL – LOW TEMPERATURE
DIFFERENTIAL”
The chiller is prevented from starting because for one
of the following reasons. The chiller will automatically
restart when the conditions have been satised (only
checked when shutdown and rst 10 seconds of Pre-
lube).
The chiller has been shut down for less than or equal to
30 minutes and the oil temperature minus the condenser
saturation temperature is <30°F.
-OR-
The chiller has been shut down for greater than 30
minutes and the oil temperature minus the condenser
saturation temperature is less than 40°F.
-OR-
Following a Power failure, upon restoration of power,
the oil temperature minus the condenser saturation
temperature is less than 40°F.
“OIL – LOW TEMPERATURE”
The oil temperature has decreased to less than 55°F. The
chiller will automatically restart when the temperature
increases to greater than 55.0°F and is greater than the
Condenser Saturated temperature by 30 or 40°F, as
described above in the "OIL – LOW TEMPERATURE
DIFFERENTIAL" message description.
“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. However,
if the power failure duration was less than the duration of
the applicable “Coastdown” period (2.5 minutes standard;
15 minutes steam turbine) when power is restored, the
remainder of the “Coastdown” will be performed, prior to
the chiller starting. This message can indicate a Cycling
(auto-restart after power failure) or Safety (manual restart
after power failure) shutdown, depending upon Control
Center conguration. It indicates a cycling shutdown
when displayed in orange characters; Safety shutdown
when displayed in red characters. The Control Center is
congured for auto-restart or manual restart after power
failure by a qualied Service Technician following in-
structions in YORK Service Manual 160.54-M1.
“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 Pre-rotation
Vanes are driven fully closed prior to shutting down
the chiller. The chiller will automatically restart when
the temperature increases to the programmed Restart
Temperature Setpoint.
“LEAVING CHILLED LIQUID –
FLOW SWITCH OPEN”
The Chilled Liquid Flow Switch has remained open for
5 continuous seconds (2 seconds with software version
C.OPT.01.15A.xxx and earlier) while the chiller was
running or failed to close during the System Pre-lube
period. The chiller will automatically restart when the
ow switch closes.
“CONDENSER – FLOW SWITCH OPEN”
The Condenser water ow switch has remained open for
30 continuous seconds (2 seconds with software version
C.OPT.01.15A.xxx and earlier) while the chiller was
running. This check is bypassed for the rst 30 seconds
of “System Run”. The chiller will automatically restart
when the ow switch closes.
“MOTOR CONTROLLER –
CONTACTS OPEN”
The Cm-2 Current module (Electromechanical starter
applications) or Solid State Starter Logic Board (Mod
“A” Solid State Starter applications) has shutdown the
chiller. When detecting 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,
LED’s on the respective device illuminate to identify
the specic fault that has occurred. Refer to YORK