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| Maintenance & Cleaning
Chapter 8
|
8-53
304243H02
4. Remove the nuts and washers holding the twisted wires to the terminal block and
remove the wires. Remove the ring lugs from the twisted wires. Save the nuts,
washers and ring lugs for reassembly.
5. Lift the top heating unit assembly up and away from the furnace base. Place the
assembly on a flat surface with the heating element facing up.
NOTE To replace the top heating unit, proceed to step 8.
6. Mark and remove the wires from the bottom heating unit terminal block (item #3 in
Figure 6).
7. Remove the thermocouple mounting screws and slide the thermocouple straight out
(refer to section "Thermocouple Replacement" ).
8. Remove the six screws holding the two element hold-down brackets (item #4 in
Figure 6). Remove the hold-down brackets.
9. Lift the heating unit (item #5 in Figure 6) up and out.
CAUTION : Do not damage the wires extending from the heating unit.
10. Insert the new heating element. Guide the twisted, solid silver terminal wires through
the slot in the side of the inner furnace. The bottom of the heating unit will lay flat
against the leaf spring.
11. Reassemble the hold-down brackets. Replace the six screws.
12. Connect the heating element terminals to the terminal block
13. Drill hole into heating element for the thermocouple, by using a guide similar to the
thermocouple head and a long ¼" drill bit. Refer to Figure 6 "Heating Unit
Replacement".
NOTE To prevent damage to insulation, drill by hand or adjust speed on drill to the
lowest setting.
14. Reassemble the furnace.
NOTE Inspect all wire connections before reassembling the back panel.
WARNING : Failure to check all wire connections may cause damage to the heating
unit.
Mini-mite Tube Furnace
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