OK, but why would it register the ground fault from the non-pstat-connected leg when cold, i.e when no power is going to the element yet?
b > On Aug 22, 2016, at 08:33, Graeme Burton <[email protected]> wrote: > > I think tests Stevie has done isolate the problem to the brew element. And I > think it's power being conducted to earth via the element leg not connected > to the pstat. May not be able to measure resistance from leg to boiler with > handheld meter. It appears to be a gfi fault so it can be caused by very > little current going to earth. Prob need an insulation break down tester to > measure. Hmm but always ???! > > Graeme > From: Benjamin McCafferty > Sent: Monday, 22 August 2016 23:19 > To: [email protected] > Reply To: [email protected] > Subject: Re: Dead short? > > Yeah, Graeme, trying to sort this in my head also. My memory is that you > have 120 to the “in” side of the pstat, with continuity to the normally > closed terminal (steam boiler) so it would send power to steam when cold and > under pressure. Once steam comes to pressure, the pstat switches to normally > open terminal and sends power to brew element (via PID for temp control, > yes?). That was my point—if the gfi pops on brew wiring when cold, I’m still > not clear that it’s just the element. And especially since he got normal > readings for resistance on both elements. If the element is cracked/shorting > via water to ground, I’d expect resistance to be something other than normal, > unless the crack was appearing when hot, which it’s not. > > Could a pstat wire (or other hot wire) be shorting to ground? But wouldn’t > that cause the gfi to trip for either boiler (i.e. since if it was steam, it > would trip when cold, brew would trip when hot, both should trip if the short > was prior to the input side of the pstat?). > > More thoughts? > > b > > >> On Aug 22, 2016, at 08:02, Graeme Burton <[email protected] >> <mailto:[email protected]>> wrote: >> >> Good thinking Ben. But I think only one element wire is switched through >> the pstat? Therefore there is power to one, side of the element and that can >> then short to earth no matter what the pstat is doing. Does that sound right? >> >> Graeme >> From: StevieG. >> Sent: Monday, 22 August 2016 22:58 >> To: Brewtus >> Reply To: [email protected] <mailto:[email protected]> >> Subject: Re: Dead short? >> >> Hi Ben - It pops the GFI with everything cold, and only when brew was >> connected and steam disconnected, but not the other way around. With the >> steam boiler normally wired and the brew boiler not connected, everything >> functions. >> >> Will call Todd today to order a part, then on with the fun :) >> >> Thanks much, >> Steve >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Brewtus" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] >> <mailto:[email protected]>. >> To post to this group, send email to [email protected] >> <mailto:[email protected]>. >> Visit this group at https://groups.google.com/group/brewtus >> <https://groups.google.com/group/brewtus>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Brewtus" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] >> <mailto:[email protected]>. >> To post to this group, send email to [email protected] >> <mailto:[email protected]>. >> Visit this group at https://groups.google.com/group/brewtus >> <https://groups.google.com/group/brewtus>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. > > > -- > You received this message because you are subscribed to the Google Groups > "Brewtus" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. > Visit this group at https://groups.google.com/group/brewtus > <https://groups.google.com/group/brewtus>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. > > > -- > You received this message because you are subscribed to the Google Groups > "Brewtus" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. > Visit this group at https://groups.google.com/group/brewtus > <https://groups.google.com/group/brewtus>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- You received this message because you are subscribed to the Google Groups "Brewtus" group. 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