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Replacing steam thermostat with higher temperature
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bcarrigg90
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Joined: 13 Feb 2012
Posts: 43
Location: cincinnati
Expertise: I live coffee

Espresso: Delonghi EC 702
Grinder: Capresso Infinity - Modified
Drip: French press is as close as...
Posted Wed Oct 31, 2012, 7:39am
Subject: Replacing steam thermostat with higher temperature
 

would it be safe to swap the 125 thermostat on my for a 140 silvia thermostat on my Delonghi EC702?  I'm going to swap out the steam wand also, and want to see if I can boost the steam pressure from the boiler by upping the temperature a bit.
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D4F
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Joined: 15 Mar 2012
Posts: 2,025
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Wed Oct 31, 2012, 11:16am
Subject: Re: Replacing steam thermostat with higher temperature
 

I had/have a 701, very similar.  I did not want to spend the money to fix it as a few discontinued parts have been changed to the 702.  There is a "Tco" thermofuse and I did not see the cut off.  It could mess up your plans if the cut off is too close to your new t-stat.  I think in F, so I believe that you want to go from about 257F to 284F.  My Gaggia is now on a PID and runs steam at about 285F and some machines are more like 300F.  I do note that steam is wimpy below 260F, thus the problem with the bimetal deadband.  I hate to think what the range is on that 125C t-stat.

Safe?  I am probably not qualified to answer that, but cannot see why not.  I would guess that to operate at the temperatures that it already does that it has normal high temp wiring.

I would also call the parts place and see if that is really the operating temperature of the steam stat and not a misprint, seems low.

 
D4F also at
http://www.gaggiausersgroup.com/
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bcarrigg90
Senior Member


Joined: 13 Feb 2012
Posts: 43
Location: cincinnati
Expertise: I live coffee

Espresso: Delonghi EC 702
Grinder: Capresso Infinity - Modified
Drip: French press is as close as...
Posted Wed Oct 31, 2012, 11:30am
Subject: Re: Replacing steam thermostat with higher temperature
 

I got that number off of the replacement parts list on several sites.  The steam thermostat i onyl 125 for sure.  I wouldn't really think a small increase in pressure would cause any problems, but any increase at all would lead to better steaming, even if only slightly.  I don't see any kind of thermal fuse on here, but i'll pole around when i open it up.

Click Here (www.ereplacementparts.com)
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D4F
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Joined: 15 Mar 2012
Posts: 2,025
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Wed Oct 31, 2012, 12:09pm
Subject: Re: Replacing steam thermostat with higher temperature
 

Part 60, "Tco" which probably is thermal cut off??  Steam pressure will significantly increase with temperature, but well below pump pressure, if I read the table correctly.

Click Here (www.jgbhose.com)

 
D4F also at
http://www.gaggiausersgroup.com/
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bcarrigg90
Senior Member


Joined: 13 Feb 2012
Posts: 43
Location: cincinnati
Expertise: I live coffee

Espresso: Delonghi EC 702
Grinder: Capresso Infinity - Modified
Drip: French press is as close as...
Posted Wed Oct 31, 2012, 12:12pm
Subject: Re: Replacing steam thermostat with higher temperature
 

Ah so it is!  Its just a standard thermistor, so i'll take a look at the temperature when i open it up in the next week or so.  The steam wand swap will probably be first, then the thermostat switching.
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D4F
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Joined: 15 Mar 2012
Posts: 2,025
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Wed Oct 31, 2012, 1:04pm
Subject: Re: Replacing steam thermostat with higher temperature
 

bcarrigg90 Said:

Ah so it is!  Its just a standard thermistor, so i'll take a look at the temperature when i open it up in the next week or so.

Posted October 31, 2012 link

I do not think so.  A thermistor is a thermal variable resistor and the thermal cutoff does just that.  Perhaps my ignorance of how it works, but the TCO should have a code to its specs.

I also believe that parts 68,69,53,and 52 are a spring loaded pressure relief valve.  They changes parts and fitment and I had looked at that on the 701.  I could not cross reference 701 to 702 to replace mine.  With higher steam pressure (prior chart) you may get more drip, though not bad when the steam valve is open and you are steaming, not just heating.  You can always catch the drip or ignore it.

 
D4F also at
http://www.gaggiausersgroup.com/
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bcarrigg90
Senior Member


Joined: 13 Feb 2012
Posts: 43
Location: cincinnati
Expertise: I live coffee

Espresso: Delonghi EC 702
Grinder: Capresso Infinity - Modified
Drip: French press is as close as...
Posted Wed Oct 31, 2012, 1:23pm
Subject: Re: Replacing steam thermostat with higher temperature
 

My mistake.  It's a thermal fuse, not a thermistor. I was thinking of how a thermistor works in reverse.  

And yes, those parts are a pressure relief valve, but its what lets water into the filter when the pump is turned on.  I could probably just put a slightly stronger screw in it if leaks more than the occasional drip.  As long as it still opens for the pump, it should be fine.

As long as the fuse is 150 or 155C then it shouldn't be a problem.  The 140 steam thermostat shouldn't ever let it get much above that. But the fuses are also cheap, so i can experiment with progressively higher values if i need until i find one that allows normal operation but will be very close to the threshold and shut things down if it remotely starts to run away.
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bcarrigg90
Senior Member


Joined: 13 Feb 2012
Posts: 43
Location: cincinnati
Expertise: I live coffee

Espresso: Delonghi EC 702
Grinder: Capresso Infinity - Modified
Drip: French press is as close as...
Posted Tue Nov 6, 2012, 9:28am
Subject: Re: Replacing steam thermostat with higher temperature
 

I got the Torx bit i needed today.  I had to order a super long 6" bit to reach up to the screws that hold the top on.  (It's a tamper resistant T20 bit if anyone is curious.)

The thermal fuse is 127, so that gives a 7 window between the thermostat and the fuse.  After I swap the steam wand, I will upgrade to a 135 thermostat if the pressure is still not enough.  I found some 142 fuses, so that gives the same window of operation without cutting off.
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bcarrigg90
Senior Member


Joined: 13 Feb 2012
Posts: 43
Location: cincinnati
Expertise: I live coffee

Espresso: Delonghi EC 702
Grinder: Capresso Infinity - Modified
Drip: French press is as close as...
Posted Thu Dec 20, 2012, 6:57am
Subject: Re: Replacing steam thermostat with higher temperature
 

So I finally got my new thermostat and thermal fuse.  Chinese budget post is nice and efficient.  But the good news is that It works!  I moved up to a 135 thermostat for steaming, and It works pretty well.  Definitely a noticeable bump in pressure.  On the downside, I discovered last week that my
OPV has a small leak.  It doesn't seal all the way.  Which explains why my shots have been a little weird.  Luckily its only a 7 dollar valve on this machine.  I'll replace it for now, but I want to figure out how to retrofit  a better brass valve.  Let the hunt for adapters begin!
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