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Bake-Out Procedure for Multiple Zone Furnaces
The furnace contains carefully selected insulation to permit the best possible operation. This insulation inherently contains moisture that must be slowly and completely removed before the furnace can be fully utilized. During this drying period, a small quantity of smoke and vapors from the binders in the embedding cement will also be emitted. The smoke will have a bad odor, so provide adequate ventilation.
Please inspect the furnace prior to the bake-out procedure. Please be sure that the furnace core is empty, that nothing is inside of it (ie. no papers, office supplies, tools etc). Please be sure that nothing is on the exterior of the furnace as well.
Please follow the recommended procedure to properly dry out the furnace insulation for maximum operating success.
200° C for two (2) hours
400°C for two (2) hours
800°C for one (1) hour
1000°C for one (1) hour
8. After this bake-out has been completed, turn off the zones and completely disconnect as in Step 6. The rest of the zones may now be connected and baked-out following the same procedures.
After the initial drying out run, all zones should be connected and the furnace should be run approximately 10°C - 40°C above the normal operating temperature, without exceeding the rated temperature, to fully stabilize the furnace. Under no circumstances should the rated temperature of the furnace be exceeded.
WARNING: Multi-zone furnaces – SERIOUS DAMAGE may result if steps 6-8 are not followed when baking out multi-zone furnaces.
WARNING: Due to the possibility of combustible gases being given off by the refractory cement binders as the furnace is heated, Mellen recommends operating the furnace in a tilted or vertical position prevent local hot spots an possible damage to the heating elements or element. Both ends of the bore should be open and the bore empty. After the initial run, the furnace can be operated normally.
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