Carbolite Gero 3508 Installation, Operation And Maintenance Instructions page 42

8.0 Repairs and Replacements
Unscrew the screws fixing the metal back piece from the inner chamber and withdraw
this part backwards complete with thermocouple(s) and sheath(s).
Withdraw the back insulation piece. Handle with care.
Remove the silicon carbide chamber side walls, then withdraw the old element(s), and
insert the new. Note that the ceramic element carriers are in two pieces, front and
back: take care when handling them.
Replace the back insulation piece and metal piece together with the thermocouple(s)
and sheath(s).
As necessary, shorten the element tails by clipping to length.
Remake all the thermocouple and element connections according to the individual plan.
Refit the back panel and operate the furnace for 30 minutes at 800 °C without
interruption to ensure complete burn-off of any organic binders. Some smoke may be
observed during this process, which should be carried out in a well ventilated area.
Check that the furnace is controlling properly to rule out the possibility that previous
element failed because of a fault elsewhere in the control circuit.
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