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Espresso: Lever Espresso Machines
Rancilio Z9 rebuild
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ThurstonRobert
Senior Member
ThurstonRobert
Joined: 19 Aug 2008
Posts: 5
Location: Oxford
Expertise: Professional

Posted Sat Aug 17, 2013, 1:05pm
Subject: Rancilio Z9 rebuild
 

Hello All,

I am pretty far along on rebuilding a Rancilio Z9 2 group lever machine made in 1981.  It's 110 v.  Now I am stuck on rewiring it.  The mercury switches had to go, as the pressure diaphragm was completely shot.  Put in a new Sirai pressure stat, rated for 240 v (man, I hope that works).  I did salvage the old autoleveler.  So now I have several questions for you geniuses out there:  1) where does the red wire from the sight gauge go?  It was not attached to anything when I got the machine.  By the way, I have the tech manual, but it has only a pathetic excuse for a real wiring diagram.  I've looked around a lot for one, and even went to the Rancilio old offices and museum in Parabiago, Italy; extremely pleasant people, but of no real help when it came to the wiring.

Q 2:  there are 2 black leads coming from the autoleveler, one for each of the mercury switches.  But, since they are gone, I wonder if I can twist the black leads together and connect them to one terminal of the Sirai.  Q.  3:  if I get all of the above right, then I assume that I should just run one hot wire from the Sirai to the boiler--right?

I have tried and tried to put pics here, but each one is rejected as too large, even though I've gotten the sizes down to well below 75 kb.  So anyone who is interested can go to www.oxfordcoffee.com and find a recent post with lots of photos.

Robert Thurston
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