VERDER Carbolite Gero WV-11-01, Installation, Operation And Maintenance Instructions

Page: 22 / 30

7.0 Repairs and Replacements
7.4 Temperature Controller Replacement
Refer to the controller instructions for more information on how to replace the
temperature controller.
7.5 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.
7.6 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
1. Disconnect the thermocouple to be replaced from its terminal block and withdraw
it.
2. Re-assemble the new thermocouple, observing the colour coding.
3. Refit the element access panel.
7.7 Element Replacement
l
Remove the side panel and the internal element cover (see section 7.3). The ele-
ment terminals are located in the side compartment.
l
Disconnect the wires from the heating element terminals.
l
Remove any starlock washers - these may need to be cut with wire cutters.
l
Remove any clips holding the element inside the chamber and withdraw the ele-
ment.
l
Reverse the procedure when fitting the new heating element.
l
To find out whether the heating element failure was caused by a fault in the control
circuit, operate the product at a low temperature and check that it is functioning cor-
rectly.
22