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How to PID my Bunn ES-1A, single boiler HX machine?
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Tex
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Tex
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Posted Sun Oct 22, 2006, 3:27pm
Subject: How to PID my Bunn ES-1A, single boiler HX machine?
 

OK, I'm convinced that this machine would benefit from the temp control to be had from replacing the Sirai pstat with a PID. Here's my plan of attack & I'd appreciate ANY feedback or comments that'll help me do this the easy way.

What I think I'll need;
  • PID
  • SSR
  • thermocouple
  • misc. wire
  • * ??

Is there a preference for the PID, SSR, & TC, as far as brands or models? I can get these locally or on eBay. Does anyone have an eBay seller to recommend?

How I plan to proceed (discussed with folks who've done the conversion);
  • I will remove the Sirai pstat & both tstats.
  • The TC will mount on the boiler at the farthest point from the water inlet.
    - I've decided that it's not worth the effort to mount the TC in the boiler.
    - The TC will be mounted on the surface of the boiler, under a large hose clamp already there (used to hold the tstats).
  • I plan to cut an opening in Bunn's front panel & mount the PID internally.
    - The PID's mounting will be directly over the pump & motor, which is already shielded from the boiler by a panel.
  • What is the max environmental temp for PIDs?
    - I can always mount a cooling fan for the PID if necessary (or should I do this anyway as a precaution?)
  • Is there any point in retaining & using the double pressure gauge?

As you can see I have more questions than answers at this point. But I'm competent to do this & it couldn't be too difficult or so many people wouldn't be doing it (some for a living it seems).

 
Tex
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http://www.tinyurl.com/2tnv87 - My 'Guidelines For Newbies' page.

http://www.tinyurl.com/2cr3e2 - I sell things for friends & neighbors here. Can I list something for you?

http://www.tinyurl.com/235dfr - BUG is Bunn User's Group (espresso)
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