Carbolite VMF/ASTM Series - Manual (Page 7)

SNF
MF31 – 3.06
7
The new solid state relay contains a built-in MOV which protects it from short periods of excess
voltage. If the old relay had a separate disc-shaped "MOV" connected between the high voltage
terminals of the old relay, discard the old MOV.
Replace the removed panel.
5.6 Thermocouple Replacement
Remove the top panel as above. The thermocouple goes vertically into the bottom of the heating
chamber.
Make a note of the thermocouple connections. Compensating cable colour codings are:
negative - white; positive - green
Disconnect the thermocouple from its terminal block.
Fit the replacement thermocouple and reconnect, observing the colour coding, and refit the
removed panel.
5.7 Element Replacement
See section 5.2 - wearing a face mask is recommended.
Remove the top panel as above.
The heating chamber is suspended from the top plate. Make a note of the wiring connections;
identify and those to the heating element, and disconnect it.
Separate the inner chamber by removing 4 screws. The heating element with its surrounding
insulation can then be lifted out of the chamber.
Replace the element with the new one, and reverse the disassembly procedure.
5.8 Fuse Replacement
Fuses are marked on the circuit diagram (section 7.0) with type codes, e.g. F1. A list of the correct
fuses is given in section 8.1.
Remove the top panel as given in section 7. The fuses are on the bottom plate; they may be
mounted on an EMC filter.
If any fuse has failed, it is advisable for an electrician to check the internal circuits.
Replace any failed fuses with items of the correct type. For safety reasons do not fit larger
capacity fuses without first consulting Carbolite.