GHL Profilux - Chiller control

I am using GHL Profilux 3.1N. It is being used with temperature probe to control a chiller.

I would like to turn off the chiller at 25.0C and turn on it at 26.0C.

The setting of my Profilux is:

Nominal value: 24.0C
hysteresis: 2.0C
cooling difference: 0.0C

Is the setting correct ?

I found that the chiller was turned on at 25.2C and turned off at 25.0C. It was on and off frequently.
How to solve it ?

Many thanks !

Anybody can help me ?

Hello,

with your settings, the chiller should turn on at ca. 25,7 °C and turn off at ca. 25 °C.
If you like to start the cooling at 26 °C, you would have to increase the hysteresis, but 2 is already the maximum.