System Run – Heating Mode
The chiller is running with Heat Pump Duty enabled and the Heat Pump Duty Operational mode
setpoint set to Heating mode. In this mode, the Heat Pump is controlling the Leaving Condenser
Liquid Temperature to the Leaving Condenser Liquid Temperature Setpoint.
System Coastdown
The chiller has shut down and the Post-run lubrication is being performed. The Coastdown
duration is determined by the setting of the Coastdown (standard or enhanced) and Coastdown
Time Setpoints. If the Coastdown setpoint is set to enhanced (steam turbine applications), it
is 15 minutes. If set to standard (electric motor applications), it is programmable over a range
determined by the Chiller Style/Compressor Setpoint (for style F/J7 and G/H K6-K7, the range is 240
(default) to 900 seconds. All others, the range is 150 (default) to 900 seconds).
Start Inhibit
The chiller is prevented from being started due to the reason displayed on the Details Line of the
Status Bar.
Vanes Closing Before Shutdown
Displayed while the Pre-rotation Vanes are closing during a Soft Shutdown. During Soft Shutdowns,
the Vanes are driven fully closed prior to shutting down the compressor. When the Vane Motor End
Switch closes, indicating the Vanes have fully closed (or 3.5 minutes have elapsed, whichever occurs
first), the Run Signal is removed from the compressor motor starter and a System Coastdown is
performed. Soft Shutdowns are initiated by the following:
1. Leaving Chilled Liquid – Low temperature
2. Remote Stop
3. Multi-Unit Cycling – Contacts Open
4. System Cycling – Contacts Open
5. Control Panel – Schedule
6. Operator Initiated Soft Stop on display
While the Vanes are closing during any Soft Shutdown, if a Emergency Stop is initiated with the Red
E-Stop Switch or any faults other than those listed above occur, the Soft Shutdown is terminated
and it will immediately perform a System Coastdown.
Run messages
Leaving Chilled Liquid Control
The chiller is running, controlling the Leaving Chilled Liquid to the Leaving Chilled Liquid
Temperature Setpoint. There are no system conditions inhibiting this operation.
Heat Pump – Leaving Chilled Liquid Control
The Heat Pump is running, controlling the Leaving Chilled Liquid Temperature to the Leaving
Chilled Liquid Temperature Setpoint. In this mode, Heat Pump Duty is enabled and the Heat Pump
Duty Operational mode setpoint is set to Cooling mode.
Heat Pump – Leaving Condenser Liquid Control
The Heat Pump is running, controlling the Leaving Condenser Liquid Temperature to the Leaving
Condenser Liquid Temperature Setpoint. In this mode, Heat Pump Duty is enabled and the Heat
Pump Duty Operational mode setpoint is set to Heating mode.
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
166
