Barnstead F62730 - Component Replacement Procedures; Replacing Fuses, Thermocouples, and Muffles

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Fuse Replacement
a. Disconnect from power supply.
b. Set furnace on its door.
c. Remove (one piece) top, back and bottom cover.
d. Replace fuses.
Thermocouple Replacement
(Type K)
a. Disconnect from power supply.
b. Set furnace on its door.
c. Remove (one piece) top, back and bottom cover.
d. Remove retaining clip from the thermocouple and
pull the thermocouple straight out from the chamber.
e. Disconnect thermocouple lead ends from back of
the controller and remove the thermocouple.
f. Reinstall thermocouple by reversing steps A through
E.
Muffle (Heating Element)
Replacement
a. Disconnect from power supply.
b. Set furnace on its door.
c. Remove (one piece) top, back and bottom cover.
d. Disconnect element lead wires from relays. (Note
placement and connection of.)
e. Remove clip from thermocouple and pull thermocou-
ple out of muffle.
f. Remove metal retaining band from defective muffle.
MAINTENANCE AND
SERVICING
Warning
Disconnect from the power supply
prior to maintenance and servicing.
Refer servicing to qualified person-
nel. Replace fuses with the same
type and rating.
Note
Perform only maintenance
described in this manual. Contact
an authorized dealer or our factory
for parts and assistance.
Note
Make sure yellow thermocouple
lead wire is connected to terminal
V+ on back of the controller. Make
sure red thermocouple lead wire is
connected to terminal V- on back of
the controller. Make sure the
exposed section of the T/C lead
wires are not contacting each other.