CWWang Senior Member Joined: 7 Feb 2011 Posts: 49 Location: Florida Expertise: I love coffee
Espresso: Arrarex Caravel. La Peppina.... Grinder: La San Marco SM91
Posted Thu Mar 3, 2011, 11:39pm Subject: Re: The Rancilio S20 Series Thread (S24, S26, S27)
There is one more question about my Rancilio S27. As I compare my circuit board to StevenZ's post, I found there is something missing in mine. It looks like a resistance, but as far as I know, a resistance should have at least three bands on it. But my missing gadget only one band. Does anyone know what is that? (The circle one in attached photo)
aleks192 Senior Member Joined: 2 Sep 2010 Posts: 39 Location: Calgary Expertise: I live coffee
Espresso: Rancilio S26 Grinder: Wega Max 6.4 Roaster: Toastess Popper
Posted Fri Mar 4, 2011, 9:10am Subject: Re: The Rancilio S20 Series Thread (S24, S26, S27)
CWWang Said:
There is one more question about my Rancilio S27. As I compare my circuit board to StevenZ's post, I found there is something missing in mine. It looks like a resistance, but as far as I know, a resistance should have at least three bands on it. But my missing gadget only one band. Does anyone know what is that? (The circle one in attached photo)
aleks192 Senior Member Joined: 2 Sep 2010 Posts: 39 Location: Calgary Expertise: I live coffee
Espresso: Rancilio S26 Grinder: Wega Max 6.4 Roaster: Toastess Popper
Posted Fri Mar 4, 2011, 9:13am Subject: Re: The Rancilio S20 Series Thread (S24, S26, S27)
I think this week I'm going to try to mod my machine to do a line pressure preinfusion.....Want to isolate the 3 way solenoid, and add a switch, so that you flip swtich 1 for the solenoid to open and allow line pressure, and switch 2 to power the pump......Am I missing something, because this hasn't really been tried by anyone on this thread so I'm not sure if its been tried and didn't work?
SteveZ Senior Member Joined: 30 Nov 2010 Posts: 24 Location: Littleton, Co Expertise: I love coffee
Espresso: Rancilio S27 Grinder: Baratza Vario
Posted Fri Mar 4, 2011, 11:01am Subject: Re: The Rancilio S20 Series Thread (S24, S26, S27)
Aleks, Seems reasonable. I have my single dose button setup as a quick 2 second preinfusion. After this I wait 10 to 15 seconds and then press the double dose button. Your method is nice because it would skip the 3 way pressure release step. Someone (homebarista perhaps) mentioned that they believed the slow pressure build up of the S27 rotary pump is similar to a quick preinfusion. I'm thinking that the soak time is too quick be much use but it is a somewhat interesting opinion.
Chun, I have more pictures of my control board but the hot water function of my board does not work (always on). Also, my board is from the first year of production, 1994. Your board might be a newer version.
Not sure from your posts but have you tried:
Checking the voltage at the hot water solenoid
Momentary switch check with your multimeter
Swapping the solenoid from your fill circuit in.
I bypassed my control board by using a 125v momentary hot water switch from La Marzocco and some high temp wire. Works well for me.
All, I just installed a temperature probe on my group head using Eric's adaptor and the cheapest Auber PID as a display. Installation was a snap (Before & after ). Knowing the temperature is helping me be more consistent with the hx flush and resulting brew temperature. I'm thinking of cutting the display into the machine just below the drip pan. The left side has room and avoids the center drain cup and right side water/power inlets. This location seems cool enough for the electronics and the pid project box seems water resistent enough to fend off occasional spills from the drip pan.
aleks192 Senior Member Joined: 2 Sep 2010 Posts: 39 Location: Calgary Expertise: I live coffee
Espresso: Rancilio S26 Grinder: Wega Max 6.4 Roaster: Toastess Popper
Posted Fri Mar 4, 2011, 7:21pm Subject: Re: The Rancilio S20 Series Thread (S24, S26, S27)
SteveZ Said:
Aleks, Seems reasonable. I have my single dose button setup as a quick 2 second preinfusion. After this I wait 10 to 15 seconds and then press the double dose button. Your method is nice because it would skip the 3 way pressure release step. Someone (homebarista perhaps) mentioned that they believed the slow pressure build up of the S27 rotary pump is similar to a quick preinfusion. I'm thinking that the soak time is too quick be much use but it is a somewhat interesting opinion.
I got home and figured it out....Rancilio already isolated the solenoid and the motor off the switch, using a double pole single throw switch......Blue powers the motor, red powers the solenoid....unplug the blue and I get line pressure through the group.....All I need is a $2 double single pole single throw switch and I can operate the motor and group solenoid seperately......Switch 1 till I get droplets forming, kick on switch 2, and when done extracting the 2 can be turned off at the same time......Once again, Calgary has failed me and I can't find a 110v 16a double SPST switch anywhere.....
Where did you mount your PID box? I assume you're only using it for the readout and no controller function? Interesting thought.....Can you not just get a digital temp readout that would use the thermistor? Or was this PID really cheap?
SteveZ Senior Member Joined: 30 Nov 2010 Posts: 24 Location: Littleton, Co Expertise: I love coffee
Espresso: Rancilio S27 Grinder: Baratza Vario
Posted Sat Mar 5, 2011, 10:15pm Subject: Re: The Rancilio S20 Series Thread (S24, S26, S27)
aleks192 Said:
Where did you mount your PID box? I assume you're only using it for the readout and no controller function? Interesting thought.....Can you not just get a digital temp readout that would use the thermistor? Or was this PID really cheap?
Right now the PID is in a project box that is sitting on the counter next to the machine. It is strictly a meter only. I looked for a digital temp readout but at $35 the Auber was cheaper than anything else. It's useful enough that I'll cut it into the machine sometime soon. I am still thinking that under the drain pan is my best option.
aleks192 Said:
And I've confirmed it does work.....I'm doing it manually right now, but I was able to line pressure preinfuse and then kick in the pump......score!
This is a clever way to do this. I just fix my hot water problem. The problem is on electrovalve. It is blocked by scale. After I break apart and clean it, it work well. But before I doing that, I made a big stupid mistake. I use multimeter to check the voltage and "current". When I check the voltage, I found there is no problem with switching on and off. However I want to make sure, I detect the current. Then I saw a spark on the circuit board. The fuse burned. I replace a new one, But I can not switch off any more. It is turn on all the time......
I still want to fix the circuit board, but there is no sign of burn like yours. I think the easy way is to add a momentary switch like what you did.
Nathan Senior Member Joined: 10 Nov 2010 Posts: 148 Location: Montreal Expertise: I love coffee
Espresso: Rancilio Silvia v3 Grinder: Vario Vac Pot: Hario
Posted Mon Mar 7, 2011, 6:28pm Subject: Re: The Rancilio S20 Series Thread (S24, S26, S27)
I just bought a really banged up S27. It's missing panels and the steam knob. I'm going to probably start another thread for the reno, but I wonder if there are other steam knobs which are compatible with the S27 ? My machine is missing most of its panels so it will end up pretty custom, so it might be cool if I the knob was custom as well. I really like the knobs that like this Pavoni.
SteveZ Senior Member Joined: 30 Nov 2010 Posts: 24 Location: Littleton, Co Expertise: I love coffee
Espresso: Rancilio S27 Grinder: Baratza Vario
Posted Tue Mar 8, 2011, 5:02pm Subject: Re: The Rancilio S20 Series Thread (S24, S26, S27)
Nathan Said:
I just bought a really banged up S27. It's missing panels and the steam knob. I'm going to probably start another thread for the reno, but I wonder if there are other steam knobs which are compatible with the S27 ? My machine is missing most of its panels so it will end up pretty custom, so it might be cool if I the knob was custom as well. I really like the knobs that like this Pavoni.
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