One of the first things I did when I started working with the CC1 is to establish what temperature profile of the machine is and how repeatable that is.
CC1 is PID machine so you set the temperature you want your boiler water at and system maintains it very closely.
Then temperature at brew head is lower than boiler temperature due to losses that are caused by water traveling through the paths from boiler to your coffee. The boiler temperature is also influenced by cold water entering boiler as you start to pull the shot.
So how did CC1 turn out? In short, excellent! With very simple routine shot temperature profile is stable and repeatable. It is something you can rely on and its set it and forget it affair.
First round of tests I did was to set PID to 200°F and see what happens. Here it is:
As you can see, after 30 minutes warm up and 2 second flush the group and machine was still not at desired temperature. This means that you should either let machine warm up longer or likely simply flush more water through it so it gets up to temperature quicker.
After that I did simple 2 second (as shown on CC1 display) flush and pulled the shot. Looking at the data I saw that there is about 5°F loss between boiler and what coffee sees so in next round I wanted to have 200°F at coffee bed so that meant I need to set PID to 205°F.
That worked great when I combined it with 3 seconds flush:
As you can see with PID set to +5°F over desired temperature on on coffee bed and 3 second flush you get very nice straight temperature profile. Very consistent.
Now please don’t get too stuck on flat temperature profile. Its not most important thing, as I have learned while studying my Cremina. There is much more to great espresso than flat temperature profile. What is important is that we get something that we can repeat and something that does not have huge temperature swing, like +/- 10°F or more…
And most important thing. How’s the taste? I would say pretty good given that this is sub $700 machine. Its not Speedster, or GS/3 or Cremina but for the money this thing is hard to beat. Its consistent and stable. Paired with nice grinder, you can’t go wrong…