Specifications

first time you use your furnace and each time you change
your set point or program or the type of load you are
heating. To use the Tuning feature:
1. Select the temperature at which you intend to
operate. If you will be running a program, enter
the value of Set point 1 as a single set point.
2. Load your furnace with a characteristic sample
of the load you will be heating.
3. Push “SEL” button until “AT” is displayed, then
push “UP” or “DOWN” button to turn “AT” “on.”
During the operation, “TunE” flashes in the lower display.
Do not make any adjustments to the controller parame-
ters during this period. The self tuning is finished when
“TunE” no longer flashes in the lower display.
Self tuning will calculate values for:
Proportional band - P
Integral - I
Derivative - d
• Self tuning cannot be initiated while running a
program.
• A power failure will cause the AT parameter to
revert back to “OFF”. (Reset tune parameter to
“ON” using the “UP” button).
• In the case of alarm conditions during tuning,
those conditions will flash alternately with
“TunE.”
The next time you use your furnace, push “SEL” button
until “AT” is displayed, then push “UP” or “DOWN” button
to turn tune “oFF.”
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PROGRAMMABLE CONTROL MODELS
Note
For processes which cannot tolerate
the overshoot naturally generated dur-
ing the tuning process, select “Lo”
rather than on for the “AT” setting. The
“Lo” setting will tune your furnace at a
temperature below your set point, then
apply the result to your set point. This
approach prevents the necessary tun-
ing overshoot from exceeding your
actual set point.