Bluenoser wrote:So you are saying this "post shot idle" is a 'bad practice' , which is great info.
To clarify, I'm saying that letting the HX depressurize and then sit and stew is a bad practice. As long as you bring it back up to pressure, all is well. This means letting the pump run long enough for your brew pressure gauge to show a normal flush pressure. No more than that should be needed to abate any concerns of a TS stall.
Bluenoser wrote:in a general flushless workflow, you'd recommend a short cleaning flush? Now I've heard a 1 second or less can introduce air into the TS.. do you think this is an issue? I was also worried cleaning flushes might deplete the TS of hot water and slow my rebound.. In one of the few times my temp was 202, I did a 3 second flush to reduce the temp to about 198 and shot was great and I did notice a fast recovery.
As long as the brew gauge registers pressure before you stop the flush you should be ok. However, what happens in practice always trumps theory...
That said, you should
see your temp gauge go up with a flush before going down on account of there being superheated (256 degree?) water in your HX. It's not really possible for your group to idle at a hotter temperature than the water that heats it, if that makes sense. The temp starts falling after the cold water injected into the HX mixes and hits the group. The geometry of the injector in the HX, the size of the HX and the size of the TS restrictor all work together to tune the temperature response of lifting the levetta, so it's possible that your machine behaves differently than a cursory evaluation by the likes of me from many miles away may suggest. Do some test flushes and see what happens. Do a 10 second flush after a long warm up. See what happens. Does temp go up and then down? Does it dip and then rebound before falling again? Does it just fall like a rock? Knowing these things will help you make educated guesses that lead to functional workflow changes to increase your shot-to-shot consistency.
Bluenoser wrote:With Eric Therm. I do notice my temp increases quite a bit when the shot starts and then falls and levels off at what I am assuming is the true brew water temp the puck will see. I've been finding that even when Eric indicates a low idle temp (192), if everything is sufficiently heated, a shot pulled will rise up to 200 and stay there.
This hump is an indication that the initial shot temp would increase with a brief flush. Try it and see. In addition to testing what a longer flush, test shorter flushes as well as the rebound will be different for different flush amounts.