Tex Senior Member Joined: 27 Apr 2006 Posts: 840 Location: Texas - That's God's country to everyone else! Expertise: Professional
Espresso: Bunn ES-1A (PID'd), Gaggia... Grinder: Rancilio MD50 Vac Pot: Way too many vintage Silex... Drip: Melitta Clarity Roaster: TurboCrazy &...
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).
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