7.4
Solid-State Relay Replacement
Disconnect the product from the power supply and remove the
appropriate cover as given above.
1. Make a note of the wire connections to the solid state relay, then disconnect them.
2. Remove the solid state relay from the base panel or aluminium plate.
3. Replace and reconnect the solid state relay ensuring that the bottom of it has good
thermal contact with the base panel or aluminium plate.
4. Replace the access panel.
7.5
Thermocouple Replacement
Disconnect the product from the power supply. Remove the appropriate panel
to gain access to the thermocouple connections. Make a note of the
thermocouple connections.
Thermocouple cable colour codings are:
thermocouple leg
colour
positive (type K)
green
negative
white
Disconnect the thermocouple from its terminal block.
Remove the gland nut from the rear of the chamber; it may be necessary temporarily
to remove some insulation material. Withdraw the thermocouple.
Fit the replacement thermocouple and reconnect, observing the colour coding and refit
the element access panel.
7.6
Element Replacement
See section 7.2 - wearing a face mask is required.
Disconnect the product from the electrical supply and remove the back panel.
Make a note of the wiring and piping connections; see section above which refers to the
thermocouple colour coding.
Disconnect terminal blocks, thermocouple and gas pipes to obtain access to the slab
element which lies beneath the chamber casting. If necessary, undo the door hinges to
allow the whole assembly to slide out. Make a note of all disconnections.
Replace the element with the new one and reverse the assembly procedure.
27
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