Had Kyle (who was on site for N2 deliveries) add 200ml water to crystal chiller. This will keep it running until I can get in and give both the chillers a full check out.
Looks like the Crystal chiller will run for about 3 weeks on a full fill before getting close to a low water shut down.
At Jeff B.'s direction I added 200 ml of water which silenced the alarm. He will be in tomorrow, as normal, and will check.