If you look at the block where the wires are screwed in, you'll see the pressurestat has two rows of contacts. We'll call them row A and row B, and from left to right, contact 1 2 3.

So you have: When the pressurestat contacts are closed (turning on the element), A1 is connected to B1, A2 is connected to B2, A3 is connected to B3. When the pressurestat is open (turning off the element) all the contacts are isolated.

So if your pressurestat only uses one pair of contacts, it will have wires to, say, A1 and B1. Simply move A1 to A2 and B1 to B2.

You can see the contact points if you look from above; choose the cleanest, nicest looking set.

Here is the old PStat.. You can probably figure out where the wires are connected by the carbon:




Here is the new one:



So if I take the two wires from the old and place it in the same place in the new, I should be OK ?

Thanks

J

Yup!
Your pstat is missing the middle column/contact; that's okay.
Just move them to the unused pair; when the contacts are closed, it will connect them together, turning on the heater.

Note that since this is a new pstat, the adjustment will be completely random.
I'd turn the machine on, and watch it come up to pressure; if the pressure starts going too high (on the order of 1.2-1.3), turn off the machine, and start adjusting the pstat down. If it clunks off before reaching your desired pressure, then start adjusting up.

Oh, and save the old pressurestat; you never know when you'll need it temporarily...or someone else might want it.

Hi

It's hooked up and it works.. At least the element fires. I didn't test a complete cycle because it appears the new pstat doesn't quite fit the way the old one does:




The box of the pstat pushes up against the element..

Should I be worried about the plastic melting ? Any ideas on how to fix this if I should be worried about the plastic melting ?

Thanks

J

Is there any way you can rotate the pstat? It shouldn't care if it isn't square to the case.

You could revert back to the old pressurestat using a different set of contacts until you get it figured out...

Hello:

From the photos, it would seem to me that the new Sirai pressurestats are of a much lesser quality (lots of plastic) with respect to the older models. My Cimbali Junior D/1 has one of the older (probably OEM) and it's a solidly made workhorse. From the looks of the new ones, I would not get one as a replacement.

But that's just me.
In any case, my Cimbali Junior D/1 is PID'd and the Sirai is set higher as a back up.

Paul Pratt has an interesting page with data and comments regarding pressurestats:

http://www.espresso-restorations.com/p-stats.html

Cheers,

CIV

The box is very tight inside. If you look at where the male pipe fitting comes out of the box, you'll see that it's equidistant to the box itself. Which means, no matter which way I have turned it, I'm stuck in the same spot.

So as I see it, I have a few solutions:

1) Cut away at the plastic with a dremel. That plastic does nothing, holds nothing and there's nothing on the other side.

2) Somehow get the copper pipe and the metal holder to be pushed further to the right. This solution is probably the best, but I have no idea how to bend copper pipe and I also have no idea how I can shorten the holder.. (see previous photos for the holder).

3) Do nothing.

So let's say I go with 3. What can happen ? How dangerous is this ? Would this be completely stupid ?

I could go back to the older Pstat.. I'd have to order a new membrane and then move the wires one over since the original contact looks pretty cooked. But I was under the impression most thought I should just toss it since it's been in service for almost 20 years..

Advice ?

J

There are different models of sirai pressurestat, so I wouldn't generalize about their overall build quality; sure they've gone to plastics but in general they are built for industrial use.

In this case, it appears that the replacement pressurestat is a different form factor from the original; I have replaced my pressurestat (similar model to your old one) with a newer pressure stet that is largely the same form factor. Have you considered finding a new one that more closely matches the old one?

Chris coffee appears to have one:

http://www.chriscoffee.com/products/hom ... /siraistat
as does Espressotec
http://www.espressotec.com/index.php/si ... l?___SID=U