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Note
If the control temperature display
moves downward, the thermo-
couple leads are reversed.
Warning
Disconnect furnace from power
supply before servicing.
7. Thread the thermocouple through the hole
in the base which has a nylon insulator,
replace clamp and screw.
8. Bend the thermocouple sharply toward ter-
minal block.
9. Secure the two yellow wires marked "+"
together on the terminal block. Secure the
two red wires "-" together on the adjacent
terminal. Make sure connections are secure
to terminal block.
A polarity test of the thermocouple and lead wire is
easily made with the use of a magnet. On chromel
alumel thermocouples and lead wire, the non-mag-
netic wire is positive ( + ) and the magnetic wire is
negative ( - ).
10. Replace bottom plate.
11. Replace thermocouple cover. (If equipped.)
12. Reconnect furnace to power supply.
13. Test operation of furnace.
To Replace Insulation
1. Remove thermocouple cover. (If equipped.)
2. Set furnace on its top and remove screw
and clamp securing thermocouple, then
grasp thermocouple and remove by pulling
it straight back. Retain porcelain insulator.
3. Remove back plate.
4. Remove bottom cover.
5. Disconnect the element leads from terminal
block.
M
S
AINTENANCE AND
ERVICING
23
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