ThurstonRobert Senior Member Joined: 19 Aug 2008 Posts: 5 Location: Oxford Expertise: Professional
Posted Sat Aug 17, 2013, 12:05pm Subject: Rancilio Z9 rebuild
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.
Symbols: = New Posts since your last visit = No New Posts since last visit = Newest post
Forum Rules: No profanity, illegal acts or personal attacks will be tolerated in these discussion boards. No commercial posting of any nature will be tolerated; only private sales by private individuals, in the "Buy and Sell" forum. No cross posting allowed - do not post your topic to more than one forum, nor repost a topic to the same forum. Who Can Read The Forum? Anyone can read posts in these discussion boards. Who Can Post New Topics? Any registered CoffeeGeek member can post new topics. Who Can Post Replies? Any registered CoffeeGeek member can post replies. Can Photos be posted? Anyone can post photos in their new topics or replies. Who can change or delete posts? Any CoffeeGeek member can edit their own posts. Only moderators can delete posts. Probationary Period: If you are a new signup for CoffeeGeek, you cannot promote, endorse, criticise or otherwise post an unsolicited endorsement for any company, product or service in your first five postings.