[Clayart] an electric kiln experience

William Schran wschran at twc.com
Mon Sep 27 20:03:50 UTC 2021


Every time I change elements in my or others programmable electric
kiln I also replace the relays at same time. Relatively inexpensive
part that like elements also have a limited life time off switching on
and off.

Bill

William Schranwschran at twc.com703-505-1617

	-----------------------------------------From: "Gregg Lindsley" 
To: "Clayart"
Cc: 
Sent: Monday September 27 2021 1:43:35PM
Subject: [Clayart] an electric kiln experience

 I have just had an experience with one of my kilns, a paragon tnf273,
 that was really interesting. I have never had a kiln respond to
 maintainence like this one did, starting because i changed out 5
bricks
 on the top row where element one was.
 I replaced element one and two, brand new, after i replaced the
brick. I
 replaced the brick because i realized that the elements do not work
well if
 they do not have the support of the brick, i.e. if they are hanging
out in
 space. why? don't know.
 This change brought more demand on the other parts that apparently
were
 also not functioning well, getting old, and gave up the effort. The
 breaker in the disconnect was the first to go, immediately failing to
carry
 the load after 1400 degrees F. It tripped twice.
 Then, after replalcing it, it wouldn't climb more than 100 degrees an
 hour. The bottom element tested at 16 ohms, right at the 10 percent
range
 that paragon says is too much. I would have left it, because 16
didn't
 seem to be that bad. But, I decided to change it, to see if that was
the
 problem. Nope. So after talking with Mike at Creative Ceramics in
Santa
 Rosa, very experienced with electric kilns, I got 3 relays and put
them
 in. There wasn't much more to replace.
 I tested the relays already in there before I changed them, and they
all
 tested at 240V. cold. Doesn't mean they won't fail at temp. Which I
guess
 one or more of them did, as now the kiln is running just fine, able
to
 keep up with the ramp entered.
 I think the lesson here for those who fire electric is to keep up
with
 the maintenance of the kiln, as performance can deteriorate without
you
 realizing it.
 --
 Gregg Lindsley
 Earth and Fire Pottery
 10325 Brookside Drive
 Middletown, Ca. 95461
 707-490-7168
 Function and Beauty
 in the Mingei and
 Bauhaus traditions
 www.earthandfirepottery.net
 'At home among the lost and found'
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