Video Support

Video Support

How To Change A Relay In An Easy-Fire Kilns
  • Be sure to keep the wires on in the right sequence when changing a power or control relay in an Easy-Fire, Easy-Fire XT, School-Master or eQuad-Pro Kiln.
  • The configuration is similar in a Jupiter panel or as control relay in a DaVinci, Hercules, or Easy-Load panel.
  • Make sure kiln is unplugged or locked out and tagged out at the circuit breaker or fused disconnect switch when doing this maintenance.
  • Parts

    See this page for the 12 Volt 30 Amp relay we use for most kilns.

    See this page for the 240 Volt 30 Amp relay we use as a control relay for 480 volt kilns.

    This video is useful for changing a thermocouple on any L&L kiln - in particular an eQuad-Pro or a School-Master Kiln.

    Be sure to maintain proper polarity.

    In the USA: Yellow Wire = PLUS (+) Red Wire = MINUS (-) The thermocouples are marked with a (+) and (-). Also the negative (-) is marked with a red marker. The negative wire is MORE magnetic than the positive wire.

    For more information about thermocouple polarity, color coding, and markings see this page.


    See this page for the standard type K thermocouple.

    See this page for the mounting hardware.

    See this for all thermocouple parts and

    How to check the operation of a control transfomer on an L&L automatic kiln. Applies to all automatic kilns that are not 480 volts. The control transformer reduces the incoming line voltage from 240, 208 or 220 volts to 24 volts for the control and 12 volts for the relays.

  • See this page for 12 KVA control transformers used on kilns with three sections or less.
  • See this page for 30 KVA control transformers used on kilns with four or more sections.
  • How to repair cracked brick in a front-loading kiln. First remove the damaged brick using a drill and chisel to route out and remove brick. Then shape a cut firebrick piece to fit in the space and cement in place. Then sand. Let the cement dry overnight and then do a slow bisque firing to cone 5. This same technique can be used on kiln bottoms and in other situations like on the side or back. Hi-Temp kiln cement can be used instead of phosphate bonded cement (which is no longer available).

    This shows some interesting techniques for repairing firebrick in front-loading kilns where it is difficult to replace an entire firebrick section.