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Bad pressurestat?  PID instead?
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erik_hammarlund
Senior Member


Joined: 20 Jul 2004
Posts: 175
Location: Martha's Vineyard, MA
Expertise: I love coffee

Espresso: X5
Grinder: Nuova MCI doserless
Drip: Braun / bodum press
Posted Sat Nov 16, 2013, 9:12pm
Subject: Bad pressurestat?  PID instead?
 

I have plugged in my new (to me) Astoria CK.

Unfortunately it seems like the boiler stays a bit low.  I have the PS cranked all the way tight to get it as "high" as barely 1 bar.

Does that suggest a bad pressurestat?  i'm not sure what else it would be.  Oddly enough, though, PIDs are so darn cheap these days that i can probably get a cheap Chinese PID, relay, and thermocouple for LESS than it would cost me to get a new PS ($45) much less a Sirai ($90-100, assuming I could even fit one).  I'm fine doing wiring and frankly

Now what?  I can hear the PS clicking off and I have it cranked as tight as I can reasonably make it.
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SStones
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SStones
Joined: 24 Nov 2012
Posts: 455
Location: Canada
Expertise: Professional

Espresso: Giga 5, ECM Giotto, Rocket...
Grinder: Anfim Milano-Best
Vac Pot: No  :(
Drip: Some $30 thing from Walmart
Roaster: I buy pre-roasted.
Posted Sat Nov 16, 2013, 9:30pm
Subject: Re: Bad pressurestat?  PID instead?
 

Seems unlikely that even when cranked beyond range "As far as you can crank it", that a pressostat would still be functional but set to below 1 Bar (Unless it were never meant to be usable in the correct rance for a steam-boiler)...  BUT if you can hear it clicking on and off and can verify that it isn't adjustable to the correct range, then you've already proven that it needs to be replaced.

Not a common way to fail, but I won't call you a liar.  I woulda assumed you were hearing a relay on the powerboard clicking as the transformer fails to keep up when hot.

If you have a lead on a cheap PID and want to go that way, go for it.  Any made in China PID is going to be reliable when compared to a pressostat that appears to work but moves completely out of range, I'd never want that brand of p-stat again.
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erik_hammarlund
Senior Member


Joined: 20 Jul 2004
Posts: 175
Location: Martha's Vineyard, MA
Expertise: I love coffee

Espresso: X5
Grinder: Nuova MCI doserless
Drip: Braun / bodum press
Posted Sun Nov 17, 2013, 2:57pm
Subject: Re: Bad pressurestat?  PID instead?
 

It's an old machine.  It doesn't make sense to me, either although it's a Ma-Ter, not a top of the line PS.

Initially it was only 1/2 bar.  Then I turned it up (cautiously, of course) until it felt like the screw hit bottom.  That is where I am now.  I might be able to get it a bit tighter but I would really have to put some elbow grease into it, which doesn't make any sense for a small mostly-plastic part.

Now, if it was on ALL the time then I would expect it to be a problem with the heating coil.  But it isn't; I can definitely hear it and see the pressure changing as it cycles.  It's just that the cycle is only between .7 and 1 bar.  

I agree, though, it is a very strange way for a PS to break.  My guess is that the spring inside the pressurestat has somehow either broken, corroded, or somehow failed to properly engage with the adjustment screw: that would mean that the spring produces too little counter-pressure on the switch, and would produce this exact effect.  Or perhaps it's just corroded a bit.  I'll take it off and fiddle with it a bit, if I can.
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calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,499
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Mon Nov 18, 2013, 4:55am
Subject: Re: Bad pressurestat?  PID instead?
 

Ps do fail, so do PIDs but less often, also a common failure is the inexpensive gauge in nearly every machine. Before digging deep into the machine, just make sure the gauge is accurately reflecting what is going on inside. If the gauge is OK, either " fix" will work.

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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