15 Barnstead|Thermolyne • 800-553-0039
The amber furnace power light will illuminate whenever the door is closed. This light will go out only when
the door is open or when there is an over-temperature condition.
The door safety switch removes power from the heating elements when the door is opened. Open and
close the door a few times, note that the amber furnace power light will go out while the door is open. If
the 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
Pushbutton "A/M" and light "OP2" are inactive and not used.
Parameters
PROG - program options . By pushing up or down buttons, three options can be chosen: run - to start
program; idle - to end program; hold - to hold program until further action.
SP - set point temperature. When running a program, it is the last temperature value attained. Push up
or down button to set.
TUNE - self-tuning feature. Push up or down button to set.
LC - loop count. The number of times the program is repeated. Push up or down button to set.
r1 - ramp rate #1. The rate of heat increase or decrease in °/minute. Push up or down button to set.
L1 - temp level #1. The temp level that r1 will attain. Push up or down button to set.
d1 - dwell (soak) time #1. The amount of time in minutes to hold L1 temp level #1. Push up or down
button to set.
r2 - ramp rate #2. The rate of heat increase or decrease in °C/minute. Push up or down button to set.
L2 - temp level #2. The temperature level r2 will attain. Push up or down button to set.
d2 - dwell (soak) time #2. The amount of time in minutes to hold L2 temperature level #2. Push up or
down button to set.
Hb - "holdback." Automatically places the programmer into "HOLD" if the measured value deviates more
than a specified amount from programmer setpoint. When measured value reenters 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.
HiAL - high alarm (over temperature protection). Push up or down button to set. Thermolyne
recommends that you set the value either at the maximum operating temperature of the furnace or a
value of 20 degrees above your working temperature if you desire to provide protection for your workload.
NOTE
The controller is fitted with a mechanical relay which is de-energized in the alarm mode. This
relay, when de-energized, removes power from the heating elements. If the primary control
circuit fails, the OTP will control the furnace temperature at the preset value you have
entered. It does not shut off the furnace but will maintain the chamber temperature at that
value.
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