No clue and it’s not something I have been worried about (maybe my ignorance).
The water in the chiller/tubes is a separate reservoir.
It’s level is always consistent.
When you stop the flow of water to/from the chiller, the chiller is at 100% as the same amount of water that flows out is the same amount of water that always flows in.
Grobo is also it’s own reservoir and it knows based upon sensors how much water needs to be in that reservoir. When you execute the fill command, it will only fill as much as this reservoir needs. When the fill is complete, this reservoir is now at 100%.
When you turn your valves back on, water will start flowing into the Grobo reservoir, but the same amount of water will also be flowing back out. So the Grobo reservoir will never increase or decrease levels as the chiller reservoir was at 100%.
I probably didn’t explain it the best, but this is how I see it. I know Grobo Support says they do not support the machine with attached chillers, but I don’t understand how having a chiller impacts a recipe. Thoughts?