Carbolite CFM MODELS Manual de Instruções de Instalação, Operação e Manutenção - Página 10

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CFM
Disconnect the furnace from the supply, and remove the end panel at the thermocouple end.
Make a note of the thermocouple connections. The negative leg of the thermocouple is marked
blue. Compensating cable colour codings are:
negative
white
Disconnect the thermocouple from its terminal block; retain any porcelain spacers.
Withdraw the thermocouple from its sheath and remove any broken bits of thermocouple.
Re-assemble with a new thermocouple observing the colour coding.
5.6
Element Replacement - 1200°C models
Please see safety note 5.2- wearing a face mask is recommended.
The chamber of this type of furnace contains a tubular refractory muffle around which is wound
resistance heating wire. In the event of failure, the whole "wound muffle" assembly must be
replaced.
Disconnect the furnace from the electrical supply and remove both furnace end panels.
Make a note of all the wiring connections; see the section above which refers to the thermocouple
colour coding.
Unfasten the electrical connections to the inner chamber (brick-box) and remove the thermocouple
(see thermocouple replacement instructions). If the connections are secured by hexagonal nuts,
two spanners should be used to avoid cracking the porcelain mounting.
Undo any screws, bolts or hook bolts necessary to release the brick-box.
Support the brick box as you withdraw it from the case so it does not fall onto the electrical
connections below.
Remove the brick box lid and all insulation, noting how it is assembled and observing the position
of the heating element wires (or "tails").
Pull the element tails out of the terminal blocks and remove sufficient insulation to allow access to
the heating element. Check and replace damaged insulation.
Fit the new heating element, ensuring that the tails are separated from the element by at least 25
mm of insulation.
Feed the heating element tails through the terminal blocks and tighten the clamping screws using
two spanners as before. Cut off excess element tails.
Refit the insulation and refit the lid. Do not use any cement unless supplied by Carbolite, as other
types may chemically attack the heating element.
Replace and fasten the brick-box into the furnace case.
Replace the thermocouple and remake the electrical connections. In porcelain and brass terminal
blocks the brass connector should be slightly loose in its porcelain support block to allow for
expansion.
Replace the panels and reconnect the electrical supply.
Switch the furnace ON and heat to 900°C without interruption, and then soak for 1 hour. 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 in the control circuit.
If you have any problems with this procedure, please contact our service division.
5.7
Element Fitting and Replacement - 1400°C models
10
positive (type R)
orange
MF10