Instruction manual

-5-
New Furnace BREAK-IN Procedure
• These instructions apply to the following MIFCO models: HTE46, HTE-88, HTE-1212, HTE-1414,
HTE-2020, HTE-2424
- These instructions apply to the upper chambers of the following MIFCO models: DU-614, DU-1020,
DU-1224, DU-2020
It is important for your new furnace to be slowly heated and dried before using. The high temperature
cast insulation that helps make your MIFCO furnace energy efficient and fast heating contains moisture
trapped during the casting process. Setting at room temperature will not remove it. This moisture will be
present as both liquid water and steam, therefore the heating process must follow the steps listed
below or the warranty may be voided. Follow these steps closely. It will help insure that you get the
maximum performance from your new equipment.
Step 1. After all electrical connections have been made, turn the furnace on and set the temperature
controller at 200 degrees F. The furnace should be allowed to run at this setting for approximately 24
hours for complete drying. If this is impractical or impossible, allow the furnace to run at this temperature
for as long as possible. Note: liquid water and steam will be visible for most, if not all, of the drying
process. The temperature, as shown on the temperature controller display, may fluctuate above and
below the 200 degree setpoint. This is acceptable because good control is not always easy at this low
temperature when moisture is present, especially in the high temperature chambers.
Step 2. After drying, the temperature should be raised to 1200 degrees F and allowed to “soak” at
this setting for approximately 1-2 hours.
Step 3. Set the furnace temperature to 1300 degrees and hold for one hour.
Step 4. Set the furnace temperature to 1400 degrees and hold for one hour.
Step 5. Set the furnace temperature to 1500 degrees and hold for one hour.
Step 6. Set the furnace temperature to 1600 degrees and hold for one hour.
Step 7. Set the furnace temperature to 1700 degrees and hold for one hour.
After Step 7 has been completed, the furnace may be cooled down or can be used at a higher temperature
for heat treating. These 7 steps need to be completed only once. The furnace may now be used as
needed.
ALL KEARNY NUTS / COPPER LUGS THAT CONNECT WIRES TO HEATING
ELEMENTS NEED TO BE CHECKED AND RE-TIGHTENED ABOUT ONCE A
MONTH UNTIL THEY STOP NEEDING TO BE TIGHTENED.