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Gaggia Classic SBDU Preheat PID Temperature Recovery and Stability, Steam
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Discussions > Espresso > Espresso Mods > Gaggia Classic...  
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brianl
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Joined: 1 Dec 2012
Posts: 470
Location: Chicago IL
Expertise: I love coffee

Espresso: Quick Mill Vetrano DB
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Drip: chemex
Roaster: Behmor 1600
Posted Mon Mar 4, 2013, 10:37pm
Subject: Re: PID Controller Instructions and How To Install PID on Gaggia & Steam
 

It's fun now that the PID turned on, haha.

So for the DC chargers. The steam one does not require a piggyback in the front switch but does on the back plug? The brew switch requires a piggyback to the front switch and the back plug both.

So the OEM steam cable(s) that attaches to the thermostat on the top of the boiler is the only wire that remains unplugged and wrapped in electrical tape? The Auber instructions state to remove the blue and white steam cables and replace it with their own two cables. However, with our setup we only have the one plug from the charger? Is this correct? Or is there another of those two OEM cables replaced?

How would I use the DMM to determine which is the Hot Lead? The hot lead would be the one we need wrapped in electrical tape as mentioned in the preceding paragraph? What do I probe with the DMM and what am I looking for?
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D4F
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Joined: 15 Mar 2012
Posts: 2,015
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Mon Mar 4, 2013, 11:04pm
Subject: Re: PID Controller Instructions and How To Install PID on Gaggia & Steam
 

My steam stat and its wires are intact.  That removal that you describe is part of the Auber steam hookup using the Auber kit.  I used the instructions for the Auber kit PID controller only, no steam, and then added the charger.  I leave the wires on the steam stat.  The PID controller replaced the brewstat and can run the machine to any set temperature where the old OEM stat would open to stop the temperature rise.

The SSR is acting like the stats, but is controlled by the settings and the RTD.  At idle the SSR is being run by PID algorithms and your settings.  When you hit the alarm switch, you no longer bypass the brewstat.  You just change the PID controller to use the alarm temperatures and that drives the SSR over the PID settings and shuts the PID portion off.   The alarm is actually always working and you keep it from overriding the PID settings by not supplying power, no AC to the power supply.  

I hope that you understand the above as that is basically how the machine now works.  The steam stat could be removed and the wires to it jumped/shorted together as the stat has no function but to keep the circuit going.  It does limit your steam temperature, but is like a safety limit.  It would cut power it the temperature got to its OEM limit.

I am sure that my attempt at explanation will lead to more questions though in conjuction with the power supply explanation and switch wiring prior, most of the owrking is covered.

Short answer

Leave the wires and connectors on the steamstat.  

Yes, the back are jumpers as all of the wires have to connect.  That is where I described a possible "tree" of added connectors unless you add 3 of the 22awg lines into one piggyback.  A line for each power supply and the one for the PID power, and then the OEM line back on.

You will have a wire off of the steam switch and tape it over as you do not want to by pass the brewstat so you remove that wire.  You replace with a power supply AC lead.

You will jumper on the brew switch and reattach the wire because you need it to continue its present function in addition to the new power supply.

 
D4F also at
http://www.gaggiausersgroup.com/
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brianl
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Joined: 1 Dec 2012
Posts: 470
Location: Chicago IL
Expertise: I love coffee

Espresso: Quick Mill Vetrano DB
Grinder: Baratza Vario
Drip: chemex
Roaster: Behmor 1600
Posted Tue Mar 5, 2013, 7:09am
Subject: Re: PID Controller Instructions and How To Install PID on Gaggia & Steam
 

Oh sorry, I didn't mean to remove wires from the steam stat itself. Just the wires that plug into the steam switch at the front of the machine. The the wire not plugged in to the steam switch is the one that is also connected to the steam stat at the other end of the wire.
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brianl
Senior Member


Joined: 1 Dec 2012
Posts: 470
Location: Chicago IL
Expertise: I love coffee

Espresso: Quick Mill Vetrano DB
Grinder: Baratza Vario
Drip: chemex
Roaster: Behmor 1600
Posted Tue Mar 5, 2013, 10:20am
Subject: Re: PID Controller Instructions and How To Install PID on Gaggia & Steam
 

how do I Use a multimeter to confirm the + and - leads on the DC?

I currently have a red and black wire and based on the colors it follows that the red is the + wire. When i hook up my multimeter with the red probe to the red wire and black probe to the black wire I get a positive reading of 5V. When I put the red probe on the black wire and the black probe on the red wire I get a reading of -5V. Does this confirm that the red wire is the hot wire since when probed with the red probe it gives a positive reading?

thanks.
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D4F
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Joined: 15 Mar 2012
Posts: 2,015
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Tue Mar 5, 2013, 10:34am
Subject: Re: PID Controller Instructions and How To Install PID on Gaggia & Steam
 

Yes on the DMM test and + and - voltages.  Red is + on that output.

On the above post about the steam stat I did not confirm that the wire pulled from the switch went directly to the steam stat.  Mine is buried in a bundle and zip tied.  Looking at the diagram it appears that you are correct.  I could not follow the wire in my machine and do not wish another loose end so did not disconnect.

 
D4F also at
http://www.gaggiausersgroup.com/
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brianl
Senior Member


Joined: 1 Dec 2012
Posts: 470
Location: Chicago IL
Expertise: I love coffee

Espresso: Quick Mill Vetrano DB
Grinder: Baratza Vario
Drip: chemex
Roaster: Behmor 1600
Posted Tue Mar 5, 2013, 11:09am
Subject: Re: PID Controller Instructions and How To Install PID on Gaggia & Steam
 

okay. For the steam DC connector I wanted to verify.

On the front steam switch, are any of the OEM wires not plugged in? Facing the front of the machine there are two columns of wires in the middle. The leftmost are the solenoid wires and are left alone. The rightmost are what I assume the two OEM wires for the steam. The colors may be different but I assume the top and bottom positions would do the same thing. Are you using a gaggia coffee or the newer gaggia classic when you name colors and such?

How did you connect to the front steam switch? A piggyback or just a female spade?
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D4F
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Joined: 15 Mar 2012
Posts: 2,015
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Tue Mar 5, 2013, 11:36am
Subject: Re: PID Controller Instructions and How To Install PID on Gaggia & Steam
 

brianl Said:

okay. For the steam DC connector I wanted to verify.

On the front steam switch, are any of the OEM wires not plugged in? Facing the front of the machine there are two columns of wires in the middle. The leftmost are the solenoid wires and are left alone. The rightmost are what I assume the two OEM wires for the steam. The colors may be different but I assume the top and bottom positions would do the same thing. Are you using a gaggia coffee or the newer gaggia classic when you name colors and such?

How did you connect to the front steam switch? A piggyback or just a female spade?

Posted March 5, 2013 link

On my version, new model, the hot incoming line is the top R and the wires are white.  It has 2 wires in the connector which means that current will flow through the connector to the next stop, the brew switch.  That is the hot line.  It will stay to bring AC to the switch.  The bottom wire on the R side of the steam switch facing the machine is blue on mine.  It is the switched on and off line.  Remove and tape over.  That will get a female spade, no piggyback as no replacement of the blue line.  I was trying to explain here, sorry that it is not clear.  I realize that you probably need exact hookup at this point, and not a rambling explanation

D4F Said:

My steam stat and its wires are intact.  That removal that you describe is part of the Auber steam hookup using the Auber kit.  I used the instructions for the Auber kit PID controller only, no steam, and then added the charger.  I leave the wires on the steam stat.  The PID controller replaced the brewstat and can run the machine to any set temperature where the old OEM stat would open to stop the temperature rise.

.....  edit ...

Short answer

You will have a wire off of the steam switch and tape it over as you do not want to by pass the brewstat so you remove that wire.  You replace with a power supply AC lead.

You will jumper on the brew switch and reattach the wire because you need it to continue its present function in addition to the new power supply.

Posted March 4, 2013 link


 
D4F also at
http://www.gaggiausersgroup.com/
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brianl
Senior Member


Joined: 1 Dec 2012
Posts: 470
Location: Chicago IL
Expertise: I love coffee

Espresso: Quick Mill Vetrano DB
Grinder: Baratza Vario
Drip: chemex
Roaster: Behmor 1600
Posted Tue Mar 5, 2013, 2:28pm
Subject: Re: PID Controller Instructions and How To Install PID on Gaggia & Steam
 

okay. I have all the wires done.

I guess i'll start with the RTD sensor. ha. Did you add thermal paste before screwing it in??
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,015
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Tue Mar 5, 2013, 2:58pm
Subject: Re: PID Controller Instructions and How To Install PID on Gaggia & Steam
 

Did you remove the stat?  Thermopaste is messy, very messy.  Something like rubbing alcohol to remove and fresh paper towels, or you will smear it all over.  You may need a little thermopaste on the screw, but little.  You may want to try to get most of the thermopaste off of the stat site before you try to screw the RTD in.  It will get on your fingers and then all over.  Put the Stat with its thermopaste in a small plastic bag, just in case you need it or you can really clean it off and skip the bag.

You have alll the wires?  You have the DC output wires and appropriate terminals or connectors?  Wire from the positive side to the PID, about 2', and then a piece of wire from the PID alarm to the SSR with a diode and then another 3 - 4" of wire to go to SSR + input?  All into a ring connector, or is that to be done.  I ask, because once you remove the Stat, no espresso until wired up :)

 
D4F also at
http://www.gaggiausersgroup.com/
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brianl
Senior Member


Joined: 1 Dec 2012
Posts: 470
Location: Chicago IL
Expertise: I love coffee

Espresso: Quick Mill Vetrano DB
Grinder: Baratza Vario
Drip: chemex
Roaster: Behmor 1600
Posted Tue Mar 5, 2013, 3:06pm
Subject: Re: PID Controller Instructions and How To Install PID on Gaggia & Steam
 

I have all the wires laid out on a table with all connectors attached. looks like everything is set. just gotta finish the RTD thermo and headshrink some stuff then assembly.

Yes, I got the original brewstat out. About to install the RTD but wondered about thermal paste. I'll put on a dab.

I have my trusty chemex out if all else fails, haha.


Which of the brew switch cables did you piggyback on the front panel for the brew DC power? there are three. You said that either the top red or middle white can be piggybacked? it doesn't matter which?
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