8 Series 31XX, 32XX Furnaces | D. Pre-Operation Instructions
D. Pre-Operation Instructions
D.1 Furnace Bake-Out
The following bake-out procedure must be performed on new furnaces or those that have
new insulation. If the furnace is used with a retort, perform the bake-out with the retort.
By baking-out the retort with the furnace, any impurities on the retort’s surface will burn
o.
NOTE: The following procedure is NOT required after replacing heating
elements only. Be sure to vent the retort during the bake-out.
CAUTION: If your furnace is equipped with sealed terminal covers, these
covers must be opened during bake-out to allow moisture to escape.
WARNING: Bake-out will produce odors and smoke. It should be
performed in a well-ventilated area.
1. If supplied with sealed terminal covers, slightly open to provide ventilation. After bake
out is complete, reseal terminal box. Heat the furnace to 400° F (205° C). Maintain
this temperature for approximately two (2) hours or until all traces of water vapor and
gases are gone, whichever takes more time.
2. When all traces of water vapor and gases are gone, increase the furnace temperature
to 1000° F (537° C), or the rated temperature of the furnace, whichever is lower. Bake
until smoke and odor are eliminated.
3. Increase the temperature to the expected operating temperature, if higher than 1000°
F (537° C). At this time, the temperature control system may be auto-tuned for
operation.
4. After the operating temperature is reached, shut o the power. With the door or end
caps closed, allow the furnace to cool 8-10 hours before opening.
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