Shutdown sequences of carrier centrifugal chiller 19 xvr

The shutdown process initiates when the chilled water temperature drops below the control point, minus recycle shutdown delta Tor when the operating schedule shifts to unoccupied or when an alarm condition occurs then the stop button is pressed.

The first two are called recycle shutdowns and the following sequence occurs.-stop signal occurs guide vanes close.

Variable frequency drive if the applicable goes to zero speed.

After starter are verified to be off the oil pump continues to run for 60 seconds to provide lubrication as he compressor coasts down.

A shutdown because a stop button has been pressed is same as the recycle shutdown except that the chiller will not automatically start.

It must be restarted manually using the CCN or the local keys unless the remote contact option is enabled.

A shutdown due to an alarm condition maybe immediate without waiting for the guide vanes to close depending on the severity of the alarm and of course the chiller will not automatically restart from an alarm condition.

Oil pump and condenser pump shuts downs .

Chiller water pump may run or shut off depending or conditions.

While the shutdown sequence is occurring the default screen will show the message "SHUTDOWN IN PROGRESS" and "COMPRESSOR REENERGIZED"