18 Series 31XX, 32XX Furnaces | G. Furnace and Element Maintenance
13. If applicable, mount the furnace on the testing machine. Connect the leads and
instrumentation, and install the terminal covers.
14. If any insulation has been replaced, follow the bake-out procedures outlined in Section
D.1 (p. 8). Bake-out is not necessary unless the insulation has been replaced.
NOTE: Do not operate the furnace with open end bores. Severe damage
can result from excessive escaping heat. Pack bores with insulation.
3150/3160 Box Furnace Element Replacement
1. Turn o furnace and allow to cool completely.
2. Disconnect the power and instrumentation wiring from the furnace. If applicable,
remove the furnace from the testing machine and position the furnace on the
workbench in a suitable cradle.
WARNING: Failure to completely disconnect the furnace from the power
supply before attempting disassembly prior to element replacement may
cause personal injury or death.
3. Remove the terminal cover. Isolate element wires from terminal block and check
resistance with an ohmmeter. If there is resistance, no further action is needed. If there
is not any resistance, replacement is needed. Disconnect and mark the element from
the terminal block. It is important to straighten or cut o the loops at the end of the
element leads in order to prevent damage to the insulation when the leads are pulled
through it.
4. Remove terminal block and ceramic beads on element leads. Beads may be inside
furnace.
Removing Side Elements – 3150 and 3160
1. Unbolt the element retainers located on the top side of the elements. This may
require a top to hold the retainer inside the furnace from spinning.
2. Remove bottom hearth plate if supplied.
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