Specifications

Cycle Indicator:

The amber cycle light will illuminate whenever the door is closed and the actual chamber temperature is

less than the setpoint temperature. This light will go out when the door is open, when the chamber

temperature has reached the setpoint temperature or when there is an over-temperature condition.

Door Safety Switch:

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 cycle light will go out while the door is open. If the cycle

light does not go out while the door is open, consult the Problem Solving 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

Problem Solving 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.