Question about Goodman CLQ36AR49 Air Conditioner

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AC Breaker trips and AC Fan turns slow.

I have goodman AC unit that the voltage measures 240V AC at sub panel breaker and contactor. Which is weird to me since this is three phase service Should be 208 across the two legs I thought. Unit is standard single phase operating on 208V from two legs of three phase service best I can tell.
I have replaced the main sub-panel supply breaker to this circuit 80 amp with a new one (not the main service breaker) and checked all connections in the main & sub electrical panel. I have also switched out the 60 amp sub panel breaker with another one (used) and get the same results When I turn on the AC fan only It hums and voltage is 57 volts on each leg to supply side of contactor. Spinning squirrel cage fan by hand it starts and runs slow. If I try and turn on the AC compressor the sub panel breaker trips immediately.
Power company says supply power is OK to building.
I am thinking of getting a 240 dummy load of some type and going to main panels sub panel supply breaker (80 amp new replacement) to connect it to test electric to that point and if it tests ok, then move to sub panel breaker 60 amp 100 ft away and do same test again and then outside to unit and repeat until I can find what section of wiring the bad connection is in . Does this sound proper?
Building is metal and really hot in attic and I am trying to avoid working in 135 deg heat unless I have to. IDEAs? Any ideas for a dummy load?
offgridman at cs.com

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Sounds like you have a bad capacitor for your squirrel cage fan , now as for the a/c unit sounds like you have a direct short in compressor to ground or leg to leg , check all wiring to make sure that it is not grounding out or melted together.

Posted on Jul 23, 2009

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CPLj24-1b


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You can check the output power by
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A professional can usually do it for $200 including service call. I highly recommend calling a professional if you feel uncomfortable in any way about working with 220 volt systems. This voltage will kill you if you make a mistake!

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Have you checked the capacitor on the unit. You will need a capacitor meter in or to check it. nI would check it first then the board. You check the board by running the one lead to the fan terminal and the other lead to the common and see if you have voltage. If you do not have voltage then the board is bad.

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If you are skilled or know somebody that is with electrical, turn the power back on to the outdoor unit take a non conductive object and
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1 Answer

Ac unit breaker trips off


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Turn on the breaker and try again, if it still trips, then we look deeper;
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If all off the wire checking still has not helped, it will more than likely be a bad condensor fan motor or a compressor, the compressor is the big black thing in the bottom of the outdoor unit, making sure that all power is turned off, pull the plastic cover off of the side of the compressor, there will be 3 wires, make sure none of them are burnt and touching the metal, if they are, repair the wire and test.
Try this and if you need to know how to troubleshoot to see if it is the fan motor or the compressor, just contact me back.
If this has been helpful, please rate me.
Contact me if I can help you any more.
Sincerely,
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