An alarm was noted this morning on the Alerton System at End X chiller 2. The alarm information is not accessible remotely. At the control a "Low Refrigerant Temperature" alarm was present. Because this is a non-latched alarm, I took note and cleared it before returning to the corner station. 

Shortly after clearing, the alarm returned. I investigated the setup of the chiller via compass and noticed that the chiller was set to "manually enable". It is my understanding that a manual enable of the chiller will hold the chiller on regardless of the demand for cooling. I suspect that the cooler temperatures combined with the manual enable kept the chiller running well past the buildings demand for chiller water and possible driving refrigerant temperatures lower than the chiller would like.

When returning this afternoon to clear the second alarm, I observed, for the first time in recent memory, EX chiller 2 ramping down indicating that the requirement for cooling had been satisfied. The control boards diagnostics agreed.

Im hopeful the chiller refrigerant will return to normal following this change but I will continue to monitor it in the coming days.

B. Gateley T. Guidry