A distributor asks:
On 208V 3P, why does the e23S-3 pull 34.6 amps, but the e23T-3 only pulls 27.7 amps? Is that a typo, or does it have something to do with splitting 3 phase over 4 elements?
Answer: On an e23T-3 you have three balanced circuits. There is a total of 48 amps being split three ways. A simple way to calculate this is that each phase is taking 16 amps X the 3-phase factor of 1.732 to get 27.7 amps on each phase. On the e23S-3 the full amperage of 40 amps is split between two phases with one phase unused. So 20 X 1.732 = 34.64 per phase. You take the highest amperage on any phase to get the amperage of the device.
I just watched (for the second time!) your excellent video regarding the repair of a kiln lid. Thank you so much for that; it is extremely helpful! Now I just have to find a source for Greenset 94P. Do you sell it? Or can you recommend a supplier? Thanks for your help!
A Customer asks:
I recently purchased an E28S-3 kiln from Clay King as a replacement for my old Excel kiln. I have a Skutt EnviroVent system (Metal collection cup under the kiln feeds to an exhaust system – has 2 holes in the cup to mix in air from the room). I watched your vent installation video which gives instructions for drilling the holes in the bottom of the kiln.
My EnviroVent instructions recommend that for a 12 sided, 18” deep kiln, I should drill one hole in the slab and two holes in the lid using a ¼” drill bit. Your video does not address drilling holes in the top of the kiln. I spoke with your representative on the phone who said you do not have top holes for your vented kilns. How does air enter the kiln?
Please advise me on this issue. I am not going to drill any holes (top or bottom) until I hear from you. In the meantime, I will run the initial test fire without the vent system and will just vent the air from the kiln room to the outside.
The air comes in mostly through the holes where the elements enter the kiln which provides a nice even distribution. Slightly different philosophy than Skutt.
Thanks for your response. I will not drill any top holes and check to see how the kiln draws when I fire it. Do you think I should drill 1 or 2 holes in the bottom slab?
Nancy – we recommend two 1/4″ holes for that kiln.
I ran the first firing for my E28S-3 kiln. Everything seemed fine while it was firing. About 15 minutes after it was complete I pressed the Stop button and the kiln started visibly rocking. The same when I pressed the Review button to see the final temp (2158). Everything was installed level and the kiln stand remained stable. But if I barely touched the kiln handle or controller the kiln rocked front to back, like the bottom slab had slightly rounded. Now that it is completely cooled, it is once again sitting flat. I’m afraid to load pots in the kiln for fear that this will happen every time the kiln reaches high temps.
I have never heard of anything like this.
I am wondering if it has to do with some issue with how the Skutt Envirovent mates with our kiln. They have a very different way of making sure the collection cup mates to the underside to the kiln and our stand if very different. Try firing the kiln without the vent attached and see what you find out.
If this is the problem I am not sure how to fix it but I am happy to work through it with you.
Ok, I’ll try that and let you know. What do you think about loosening the metal skin on the bottom slab just a little bit to give the brick more room to expand?
No problem with that if you want to try it but I do not think that is the issue
I just wanted to give you a follow up to my “rocking” kiln problem. The problem did seem to be the EnviroVent, but, for the life of me, I can’t comprehend the physics of why. I disconnected the collection cup under the kiln, ran a fast cone 5 glaze cycle and the kiln didn’t rock.
I want to use my vent, so I decided to experiment with a different installation. The collection cup sits on a metal post with a strong spring to hold it up against the bottom of the kiln. I removed the post and spring, used a piece of thick kiln insulation blanket to cut a new gasket for the top of the cup that would have some give to it, and braced the cup up against the bottom of the kiln stand with some old kiln brick and a piece of broken kiln shelf. I entered my favorite cone 5 with a hold program and the kiln fired beautifully!!
Thanks for your help. Hopefully, I won’t have any more problems, but it’s nice to know that L & L has such great support!! I’ve been firing electric kilns for over 20 years now and this is my first “brand new” kiln. I’m really looking forward to glazing all the bisqueware that has accumulated in my studio while I dealt with my old temperamental kiln.
We just shipped a TB3436 Bell-Lift kiln to Kohler this past week.
Here it is before it is taken apart:
Here it is packed ready for shipment:
A customer writes:
I have an X3227 DaVinci kiln that I bought in 2000. It has been sitting unused in my studio for about 8 years and I am looking to sell it. While I was looking it over I noticed that the counterbalance cables were slack and no longer supported the lid. I also noticed some of the hardware on the kiln had rusted. I can’t see where the cables hook up to the weights because they are enclosed in the tube, but I’m thinking that perhaps the connection rusted out so that the weights dropped off. Does that make sense? I’m wondering if you could give me some directions as to how I can fix this problem.
The only visible area on the counter balance system is the steel cable that attaches to the eyescrews at the front of the lid and run upward to the tubes at the back of the kiln. Those cables should be taut but they are slack. If I try to lift the lid it is very difficult because it is not assisted by the counterbalance system and I am lifting the full weight of the lid. Maybe if you could explain how the system works, it would help me understand what has happened. The cables run through the top of the steel tubes on the rear of the kiln along a pulley which I can see at the top of the tube. I’m assuming that the cables are attached to some sort of weights inside the tubes but maybe I’m mistaken. How does the system work? The cables appear to be disengaged from whatever created tension in them.
Inside the tube there is a spring. Attached to the top of the spring and the bottom of the spring is a metal clip. This is screwed into the spring . Wrapped around the top clip is a wire rope which has a wire clamp on it. Perhaps this has come undone. To get to the assembly you would need to grind off the welds on the bar that holds the spring clip to the bottom of the tube. After you fix the interior assembly you will need to reweld the bar that holds the clip at the bottom of the tube.
We just installed a new L&L kiln (Model e23T-208, Serial # 050916-B-CWK) and L&L Vent-Sure Downdraft Kiln Vent System with the Vent Doubler System so we could also vent our existing Skutt KM1023.
My question involves the size of the central duct (which I understand to be the flue that exits the room).
If I understand correctly, on page 6, the kiln vent manual states that for 2 kilns the central duct should be 6”. PLEASE KEEP READING!
Our central duct is 4”, BUT we will ONLY BE CAPABLE OF FIRING ONE KILN AT A TIME. With the idle kiln dampered off, will the 4” central duct be adequate/acceptable for this situation?
The volume of air to be moved is actually for one kiln at a time only in this scenario so a 4″ duct is perfectly acceptable.
Some general thoughts:
The table on page six of our instructions is meant as a general guideline in any case. The larger size of the duct reduces the static pressure which allows a higher volume of air to flow assuming the same input (our fan in this case).
So I’ve had a Skutt KM818 that I bought used a few years back that wasn’t in too bad of shape, but after changing the elements in it a few times, the bricks were getting so hammered & I had had a few mishaps in it & I was tired of using element pins and it was needing some TLC, so when this J18 appeared on our local want ads, I snagged it up. The top was the only part that looks used. Inside it looks brand new! I took the controller & S-tc out of the Skutt, took the manual controls off the J18 and voila!, you have a LLutt! Fires like a champ! Just thought I would share and I am so glad to not have to change the elements in that Skutt again! I might use it for Raku!!! Sincerely, one of your faithful L&L followers!! Jeff
I expect to receive delivery tomorrow evening of 3 new thermocouples for my JD-2927-HD kiln (originally purchased in 2007). Should I plan a “run-in” firing, say to Cone 5, when these new thermocouples are installed? (Note: I installed new elements last October and performed a “run-in” firing for the new elements.)