Hello. Can someone explain more about closed loop regulator settings? What is P and I factor? What value i should use?

Manual say only that:
P factor - determines how much the regulator has to react to the deviation from the set composition in a manner proportional to
error. For a narrowband probe, the setpoint value is the probe switching value.
I factor - determines how much the regulator has to react to the deviation from the set composition when after some time not
the set value has been reached.
Delay controller - determines the time how often the regulation of the mixture composition is called. The smallest value
means that regulation will take place most often.