[Elecraft] K3 Fan Settings

[Irwin Darack]

How do I set the radio to turn on the fans when then 100 w amp temp gets to
a specific temperature.  I am playing around with the RTTY contest -
running 70 watts output into a tuned antenna.

With KPA3 set to NOR, the fans do not seem to turn on, even when the 100W
amp gets to high. I know the fans are working because when I set KPA3 to FN
1 to 4, then fans run continuously at the appropriate speed.

PA temp is set to 27C.  Should this be lower?

Thanks,
Irwin KD3TB