50
NOTE
Read the following before using the Autotune feature.
See Section 3.5 to change functions.
1. Functions .16-.24 should be selected first unless default values
are used.
2. Adjust range if required (see Functions .16 and .24).
3. Select high (tenth degree) resolution (0.1°) (Function .18) or
Negative Temperature Ranging (Function .17) if required.
4. Select required display units (°C/°F)-Function .22.
5. Proportional cycle time, factory set at 20 seconds, may be
changed (Function .4 or .10), or by accepting the optimum time
calculated after running AT.
NOTE
For units with a mechanical relay (or a mechanical contactor
in the system), do not attempt Autotune with a cycle time
shorter than 20 sec.
6. For best results, use normal setpoint and load conditions.
7. Start with the cool load.
To Autotune:
8. Start Autotune process near ambient temperature, and follow
these 4 steps.
5.1.2 Using Autotune AT
To get into Program Mode:
To change to Option Mode:
(leaving the Function as .0).
STEP ACTION DISPLAY
1
2
Press P
Function (flashing)
Press ★
Option (flashing)
0.
0
0.
0
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