21 Barnstead|Thermolyne • 800-553-0039
furnace power light does not go out while the door is open, consult the Troubleshooting section before
proceeding.
WARNING
To avoid electrical shock, this furnace must have the door switch connected and operating
properly. If the furnace power light does not go out while the door is open, consult the
Troubleshooting section before proceeding.
NOTE
The two center push buttons are inactive and not used.
Parameters
Pnr - Program Number. The program number of the program you are are going to work with. By pushing
the up or down button you can select a program numbered from 1 to 4.
PR1 - Program Ramp Rate. The rate of heat increase or decrease in °C/minutes. Pushing the up or
down button will give current setting of this ramp.
PL1 - Program Level. The temperature to which the furnace needs to attain. Push up or down button to
set.
PD1 - Program Dwell 1. Amount of time in minutes to hold PL1 program level temperature entered. Push
up or down button to set.
You will use the same descriptions and procedures used for PR1, PL1, PD1 for the remaining Program
Ramp Rates PR2 - PR8, Program Levels PL2 - PL8, and Program Dwells PD2 - PD8.
Cnt - Continue. Allows linking of programs. You may select Cnt as "y" (yes) or "n" (no) by pushing the up
or down button.
HB - Holdback. Automatically places the programmer into "Hold" if the measured value deviates more
than a specified amount from programmer setpoint. When measured value re-enters the holdback band,
the timing for the segment resumes. (Parameter is expressed in °C and only functions when running a
program). Push up or down button to set.
PLC - Program Loop Count. The number of times a program will be repeated. Push up or down button
to set.
SP1 - Setpoint One. Indicates current setpoint. Push up or down button to set.
SP2 - Setpoint two. Not configured into control and nonfunctional. Set to "20".
AT - Adaptive Tune. Analyzes and inputs optimum PID values when temperature has reached setpoint.
This function does not have a value; it is either "ON" or "OFF." (See Furnace Operation for function of
Adaptive Tune).
ATR - Adaptive Tune Range setting. Determines the operational band width of the adaptive tuning
function. Self Tuning automatically determines this setting.
AL1 - Alarm 1. A full scale alarm which protects load and furnace when temperature exceeds preset
value. Furnace will control temperature at the preset temperature value; it will not shut off furnace. Push
up or down button to set.
NOTE
Thermolyne recommends that you set the value either at maximum operating temperature of
the furnace (1100°C = 2012°F) or a value of 20 degrees above your working temperature if
you desire to provide protection for your workload.
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