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Old 09-13-2011, 08:35 PM   #1
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AC blew 20 amp breaker

So we are here in San Antonio at 103 degrees and ran the AC all night at 68 temp and auto fan, no problem. Left this AM with the AC on "auto" fan and temp at 69. Gone all day and came home to no AC and the 20 amp blown breaker. This is a real PITA when it's 105 in the AS and takes all night to get really cool. I had nothing electric on in the AS but the fridge and AC, even turned off the hot water tank. Everything else was fine. Tomorrow I am going to leave the temp at 78 and see if this keeps from blowing the breaker. Anyone else had this issue? Any suggestions? Thanks-

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Old 09-13-2011, 08:46 PM   #2
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I've not had the problem, but have heard of others who have had to replace that braker.
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Old 09-13-2011, 09:28 PM   #3
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Originally Posted by pappy19 View Post
So we are here in San Antonio at 103 degrees and ran the AC all night at 68 temp and auto fan, no problem. Left this AM with the AC on "auto" fan and temp at 69. Gone all day and came home to no AC and the 20 amp blown breaker. This is a real PITA when it's 105 in the AS and takes all night to get really cool. I had nothing electric on in the AS but the fridge and AC, even turned off the hot water tank. Everything else was fine. Tomorrow I am going to leave the temp at 78 and see if this keeps from blowing the breaker. Anyone else had this issue? Any suggestions? Thanks-

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If the line voltage drops below a certain voltage, the current draw to the AC, will increase. That will pop the breaker.

Considering the ambient temperature, most likely many other coaches have the AC on as well.

Best thing you can do, is monitor the AC voltage and see what happens.

Also, if your using an extension cord that has an inadequate rating, that will also contribute to the excessive AC current draw, leading to a popped breaker.

There is also an outside chance, that the breaker has become defective and is popping at a current flow of less than 20 amps. That can and does happen.

Lastly, the AC might have an original glitch. All you can do, is a process of elimination, to find that absolute cause.

Andy
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Old 09-13-2011, 09:44 PM   #4
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I just last week replaced my breaker for the AC. It was blowing just once in a while during start up of the AC, even though the power was well up in the green on my monitor. The new breaker has not blown even once over the last weekend, even though the power in the park was a bit marginal.

Breakers get tired over long periods. If it is a dual 20A breaker like mine was, you might try swapping the wires to the two sides of the breaker. I think the microwave is on the other side.
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Old 09-14-2011, 06:12 AM   #5
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What Steve said. Post 2. Sal.
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Old 09-14-2011, 06:56 AM   #6
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68 degrees? a little cool, we live in Fl and set our ac on 78 to 80. Sorry not meant to be a a personal attack. jim
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Old 09-14-2011, 06:57 AM   #7
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"fridge & AC"

Put the fridge on LPG and try again...


This has helped to keep our AC running on very hot daze?....it has a time delay for the AC compressor.

Bob
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Old 09-14-2011, 08:54 AM   #8
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68 degrees? a little cool, we live in Fl and set our ac on 78 to 80.
We set ours at home to 78 at night and 80 during the day. In the trailer, however, there is so much heat leakage through the large window area and the walls and floor that we set the thermostat at about 72 at night and 74 during the day to get about the same comfort level.
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Old 09-14-2011, 09:25 AM   #9
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Considering the age of your rig I would assume the barker is good and have to go with Andy on a voltage drop.

If this happened in a campground and everyone had their AC on a voltage drop is most likely.
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Old 09-14-2011, 09:34 AM   #10
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Gotcha--I also have to set mine lower in the as.
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Old 09-14-2011, 10:09 AM   #11
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If the unit ran for hours without popping the breaker and then popped during the hotter part of the day that would point to a voltage drop.

A 20 amp breaker is designed to pop at 80% of rated capacity. The only things that can effect that are the load, the AC, and the voltage. An AC running at 100 % duty cycle, hours without cycling, has a constant load. If the breaker held under this condition the current through the breaker was below the trip current. Now during the heat of the day if the voltage drops the current will go up and may cross the 80% threshold and the breaker will trip.

Now that said another consideration is the compressor has a head pressure cutoff switch to protect it. In temperatures above 100 degrees this is a consideration. If the unit shuts down under this condition the fan should still work and the breaker will remain in the on position.

If that is the case the first step would be to clean the condenser coils to insure max air flow over them.
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Old 09-14-2011, 10:20 AM   #12
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I found the breaker box almost too hot to touch when the breaker popped after running the AC all afternoon at 112 degrees. The AC was running steady and the fan was on steady high, so no start up current caused the breaker to pop. I figure the heat in that upper rear cabinet was probably the culprit, so I opened the cabinet door and let it cool off. I had no more problems after that.

BTW: The voltage was plenty high. I was the only one in the campground and that campground always has high voltage at all five sites.

We have 3 cats in the trailer, so a reliable AC is critical. I leave both vents open and the thermostats on the fans set to start the fans if the temperature gets too high with front fan blowing in and rear fan exhausting. I also set the Endless Breeze fan blowing toward the rear of the trailer. The cats usually sleep in front of the fan.
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Old 09-14-2011, 10:31 AM   #13
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The breaker box being TOO HOT to touch is an indication of a loose connection in the box. That connection may be inside one of the breakers but I would first suggest tightening all the connections. If you can get more than a 1/2 turn on a connection it was loose.

A loose connection will produce heat and drop the voltage.
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Old 09-14-2011, 10:37 AM   #14
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The breaker box being TOO HOT to touch is an indication of a loose connection in the box.
There are no loose connections. They were all gone over very recently. Simply, at 112 degrees with the sun on the back of the trailer, everything in both upper rear cabinets was equally hot. The minimal insulation along with no airflow does the trick.
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