Thank you for sharing. I have a 60 ton that shut down about 30min. And restart when there is 73 + oat and the third compressor kicks in. I never see the 4th run at anytime. I replaced the 4th comp. contactor and it run good for 5 days and start shutting down. advice.
Hi, are you still looking for help on this. I have just recently expanded my operations and it may be something I could check out. What area of PA are you in?
The 3.2 amp resetable transformer should trip when contractor goes bad, contactors don't kinda go bad they ground and fail, they pull big amp draw, even if chattering they pull big amp draw. Worked on AAON for 20 years & 80+% off the time I'm working on AAON... bet you something is miss wired, lots of same color wires in same place, never seen what your describing B4 on regular bases, just trying 2 help. If they are pulling over 1.5A but under 3.2(or even 6.4 when 2 trans wired parallel) something is wrong, could be 24VDC barely grounding through limit or wire somewhere, but contactor failing should not cause this. Been on thousands of aaon units personally.