6.3
Safety Warning - Molybdenum Disilicide Elements
Molybdenum disilicide elements form a glazed surface when heated.
Internal stresses can form through heating and cooling which render
the glaze fragile. The glaze can sometimes splinter into a shower of
sharp particles when handled. Always wear eye protection when
handling the elements.
Handle the heating elements with extreme care as they are very fragile. Also, avoid
touching the heating surface (the thin part of the element), as the material is
susceptible to corrosive damage from skin contact.
6.4
Temperature Controller Replacement
Refer to the controller instructions for more information on how to replace the
temperature controller.
6.5
Fuse Replacement
Fuses are marked on the wiring diagram with type codes, e.g. F1, F2. For more
information on fuses refer to section 9.0.
Depending on model and voltage, the different fuse types may or may not be fitted.
If any fuse has failed, it is advisable for an electrician to check the internal circuits.
Replace any failed fuses with the correct type. For safety reasons do not fit larger
capacity fuses without first consulting Carbolite Gero.
The fuses are located at the cable entry point. Remove the back panel or control box
back panel to gain access to the fuses.
6.6
Thermocouple Replacement
Disconnect the product from the electrical supply and remove the product's element
access panel.
Make a note of the thermocouple connections. The negative leg of the thermocouple
is marked blue. The "compensating" cable for 1700 & 1800 °C thermocouples is plain
copper.
Disconnect the thermocouple from its terminal block.
Bend the metal, or release the thermocouple sheath; withdraw the sheath and shake
out any fragments of thermocouple.
Re-assemble with a new thermocouple observing the colour coding. Ensure that the
thermocouple is not twisted as it is being inserted and that the metal tag is bent back,
or the screw inserted, to grip the sheath.
Refit the product's element access panel.
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