jeffrey.kissel@LIGO.ORG - posted 13:41, Friday 25 August 2023 - last comment - 12:01, Monday 28 August 2023(72428)
Chilled Water Pump Has Failed for EY HVAC Air Handlers
J. Kissel, for T. Guidry, R. McCarthy Just wanted to get a clear separate aLOG in regarding what Corey mentioned in passing in his mid-shift status LHO:72423: The EY HVAC Air Handler's chilled water pump 1 of 2 failed this morning 2023-08-25 at 9:45a PDT, and thus the EY HVAC system has been shut down for repair at 17:35 UTC (10:35 PDT). The YVEA temperature is therefore rising as it equilibrates with the outdoor temperature; thus far from 64 deg F to 67 deg F. Tyler, Richard, and an HVAC contractor are on it, actively repairing the system, and I'm sure we'll get a full debrief later. Note -- we did not stop our OBSERVATION INTENT until 2h 40m hours later 2023-08-25 20:18 UTC (13:18 PDT), when we've gone out to do some commissioning.
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The work that they've been doing so far today to diagnose this issue has been in the 'mechanical room'. Their work should not add any additional significant noise over what aready occurs in that room at all times, so I do not expect that there should be any data quality issues as a result of this work. But, we shall see (as Jeff points out) if there are any issues from the temperature itself changing.
They are done for the weekend and temperatures are returning to normal values.
Chiller Pump #2 is the chiller we are now running.
Chiller Pump #1 will need to be looked at some more (Tyler mentioned the contractor will return on Tues).
Attached is a look at the last 4+yrs and both EY chillers (1 = ON & 0 = OFF).
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See Tyler's LHO:72444 for more accurate and precise description of what had happened to the HVAC system.