[RussWhite]

Those are some incredibly high temperatures.
You may need to get some additional data to determine for sure what is going on with the unit.
I would suggest a clamp on ammeter with a max/min function. May as well get one that does DC amps too while you are at it.

I think the first thing I would want to know is if the breaker is just doing its job.
For that, open the AC distribution box and clamp your meter on the wire leaving the breaker in question.
When the temperature are in the range you expect a trip, start the max/min function while the unit is running. This is important as if you set the max/min then start the unit you will get a max on startup current and that won't tell you anything as the breaker will not trip on that very short maximum current.

If the breaker is tripping below its rating, replace it of course. If not it will probably be caused by high compressor draw due to very high head pressure. You could confirm that with the meter on the wire to the compressor/s.

Good luck,


Russ - don't do this if you are not comfortable working near live wires!