- Unplug kiln.
- Trace wiring for missing or bad connections.
- Check wiring against wiring diagram.
- Check for corroded connectors or connectors that have frayed wires. Replace any such connectors.
On most L&L Kilns this is very easy to do. It is a matter of re-distributing the wires between the kiln fuses or relays and the main powerblock inside the control box.
On Easy-Fire kilns the elements must be changed also. On Jupiter and DaVinci kilns elements do not need to be changed.
Two section Easy-Fire kilns and the Liberty Belle kiln are not designed to accommodate a 3-pole powerblock so changing them to 3-phase would be difficult but possible.
Dura-Fire kilns are all 1 phase only.
Jupiter manual kilns without 30 amp fuses need completely different control boxes when going from 1 phase to 3 phase, no problem to go from 3 phase to 1 phase though.
What is important to remember is that all the kiln circuits after the main powerblock are 1 phase, on both 1 phase and on 3 phase kilns. Being 1 phase, power is carried through the circuit to the elements by just two wires. On all L&L kilns all the circuits originate at the main powerblock. On 3 phase kilns each circuit taps 2 of the three poles on the main powerblock. On 3 phase kilns each pole of the main powerblock is labeled "L1", "L2", or "L3". The circuits on (for example) an E23T 3 phase kiln would go like this: The top section would connect to L1 and L2, the middle section would go to L2 and L3, and the bottom to L1 and L3, (the control circuit always goes to L1 and L2). It makes a pattern so no matter how many kiln sections someone has you can always apply the pattern to the wires that come from the main powerblock (except for the control circuit wires which always go to L1 and L2). Here is the pattern:
L1 Top Section
L2 Next Section down (or bottom section if it is a 2 ring kiln)
L3 Next Section down (or bottom section if it is a 3 ring kiln)
L1 Next Section down (or bottom section if it is a 4 ring kiln)
L2 Next Section down (or bottom section if it is a 5 ring kiln)
L3 Bottom Section if it a 6 ring kiln
L1. The following will help you actually do it:
Get a new kiln label with the proper electrical info on it
1 phase Easy-Fire to 3 phase Easy-Fire
Changing phase often means pulling more or less amperage. Be sure to check the electrical specs for your kiln as it will be after the change- i.e. if you are changing to 3 phase look for the electrical specs for your kiln as a 3 phase kiln. Be sure your breaker and wire size is large enough. Breaker size is determined by the new amp rating of the kiln, multiplied by 1.25 (125%) and then rounded up to the nearest breaker size. Wire size is tied to the breaker size:
||12 gauge copper|
|30 amps||10 gauge copper|
|40 amps||8 gauge copper|
|50 amps||6 gauge copper|
|60 amps||6 gauge copper|
|70 amps||4 gauge copper|
|80 amps||3 gauge copper|
|90 amps||2 gauge copper|
|100 amps||1 gauge copper|
|125 amps||1/0 gauge copper (pronounced "one aught")|
|150 amps||2/0 gauge copper (pronounced "two aught")|
|175 amps||4/0 gauge copper (pronounced "four aught")|
|200 amps||250 MCM copper wire (MCM = Thousand Circular Mils)
||350 MCM copper wire|