Instruction manual

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(For special order units with the following controller.)
OPERATION OF THE HONEYWELL UDC-2000 HIGH LIMIT
THIS IS INTENDED AS A QUICK REFERENCE GUIDE AND SHOULD NOT BE SUBSTITUTED
FOR READING THE PRODUCT MANUAL. THE PURPOSE OF THIS SHEET IS TO GET YOUR
FURNACE RUNNING AND SIMPLIFY OPERATION IN THE BEGINNING.
INDUSTRIAL FURNACES WITH HIGH LIMIT
Once you have started your furnace and entered a setpoint in the control instrument, you must
also enter a setpoint value in the High Limit instrument. If the instrument display reads LIMIT you must
first press RESET button. Then press the display button marked DISP, and once again, as with the
control instrument, SP will appear in the lower left of the display, and what was your process value or
chamber temperature will now become your setpoint value. Enter a setpoint approximately 20° to 25°
higher than the setpoint in the control instrument. Once you have obtained a setpoint value the display
will return to Process value in about 1 minute. If the high limit instrument is engaged, the main contactor
will be released and the display will read LIMIT. It must be reset after the process temperature goes
below the setpoint to restart the furnace.
If you have any questions, please feel free to call McEnglevan or Honeywell’s toll free number
found inside the front cover of the instrument operating manual.