Johnson Controls York YD Manual page 43

Table 8: Cycling shutdown messages
Message
Control Panel – Power
Failure
Leaving Chilled Liquid
– Flow Switch Open
Condenser – Flow Switch
Open
Model YD Mod D with OptiView Control Center
Description
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.
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.
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.
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