To Replace Thermocouple - Barnstead FB1300 Operation And Repair Manual And Parts List

Warning
Disconnect the furnace from the
power supply before servicing.
19. Replace the back insulation block and
back plate.
20. Examine the thermocouple, and, if it is
good, reinsert it into the chamber. It
should extend about 1-1/2" into the
chamber. Make sure porcelain insula-
tor is in place for the thermocouple to
pass through on the steel back plate.
Replace clamp and screw. (Excessive
scaling, pitting, or cracks are some
indications that the thermocouple may
need to be replaced.)
21. Replace thermocouple cover.
22. If replacement of back insulation is
necessary, carefully redrill hole for
thermocouple, using back cover as
guide.
23. Reconnect furnace to power supply.
24. Test operation of furnace.

To Replace Thermocouple

1. Set furnace on its top.
2. Remove thermocouple cover.
3. Remove screw and clamp holding the
thermocouple, then grasp the thermo-
couple at the bend where it enters the
chamber and pull it straight back from
the furnace. Retain porcelain feed-
through insulator.
4. Remove bottom cover.
M S
AINTENANCE AND ERVICING
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