50 Ton AAON Roof top HVAC Unit, No Cooling Service Call 

Information like this is gold

Travis great video thanks. That exact unit I’m currently retrofitting with Honeywell Controls. Do you have any advice?

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.

Love the aaon vids. Would love to work on these

Hi, what is your company name and information? I am having leak problems with my AAON Rooftop unit. We are in PA

Nice video Thanks for sharing

How do you check the transducers?

thanks, please do a sequence of operation video, thanks

greetings from south florida. i noticed the packard brand contactor: absolute garbage. I've had those bad right out of the box... smh

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.

Are all 4 COM supposed to come on at the same time or there's a sequence TY

Thank you sir

Those look very similar in layout to the C box lennox units (15+ ton units) LGC/LGA/LGH type models.

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AAONS are the biggest POS out there. Well, one of them. 37 years doing HVAC service and all of the manufactures forgot the KISS principal.

4 x 12.5 ton compressors