York YD Mod D, Operation Manual, Page: 139 / 160

Table 142: Cycling shutdown messages
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 < the duration of the coastdown period 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 the control center configuration. 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.
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 system pre-lube period. The chiller will
automatically restart when the flow switch closes.
Condenser – Flow Switch
Open
The condenser water flow switch has remained open for 30 continuous seconds while the
chiller was running. This check is bypassed for the first 30 seconds of system run. The chiller
will automatically restart when the flow switch closes.
139 Model YD Mod D with OptiView Control Center