Moving on to better coffee -- Machristay Black Pearl -- has revealed some other aspects of the equipment's personality.
The Casa is not an easy machine to temperature surf. Maybe Ken's PID solution is the best way to go for home use, maybe not. Without it... The pressure out of the box was too high, and forced me to use the hot water tap to lower the pressure and temp in the boiler in order to get some control of the water in the HX from day one. Even after lowering the pump pressure (to 9 bar). the hot water tap remains an important part of the water dance.
There's just so much mass in the Casa that unless you're pulling a steady stream of shots, you not only have to draw a lot of water through the HX you have to lower the temp in the boiler as well so the boiler itself isn't supplying so much energy to the exterior of the entire water path.
The volumetric water dosing makes the dance a little easier. But if you want to get good pulls, you'll use the free pour button to shut off the flow based on blonding. There's no substitute for paying attention.
It's hardly news but bears repetition that the DT/1 is at its best when making lots of coffee. Regular home use like four morning doubles requires flushing a LOT of water. The machine is stable in flux, but too hot at rest.
Man, that grinder is sensitive! Switching coffees and the mercurial weather (something you don't see much of here) has me playing with grind and tamp pressure. I'm back to a fine grind and light tamp with the Black Pearl -- but the fine grind comes from a coarser setting. I don't find the Max/Hybrid loud at all, at least not compared to my old Pasquini Moka. I suppose it's a matter of what you're used to.
I am loving everything about the grinder and doser.
It was quite a few months between the time the Pasquini broke and the Casa came. And when I bought the machine and grinder, I also bought my first American style tamper. So, there was some rust to knock off and some new techniques as well as all the equipment shuffling.
The first shot sequence goes like this: Big flush; wait; medium flush; run hot water tap; short flush; wait; warm cup with hot water tap; short flush; grind, dose, tamp, pull the double. If you're not already familiar and reasonably skilled at taming an HX, this one is pretty complicated. If you are, it's a lot of water -- but since it's plumbed in at both ends, what the hell?
With the good coffee (about a week into the project), I started pulling consistently VG to E shots. I don't expect any godshots with this particular mix, but the new average is surprisingly close and much better than the old Pasquini average.
Milk is stupid easy.
Double manometer; Automated dosing
Preinfusion; Plumbing in; "Home" steaming tip
Worth four large for the machine and grinder? It seems increasingly likely.
BDL