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Old 09-14-2011, 10:45 AM   #15
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This past summers heat wave has reminded me of the 20 degree rule...

If its 100 outside you need to set the AC at 80 or it will run constantly

We had a 95+ degree run this Summer,(100+interior), AC set at 80.
85 and comfortable inside, I think more than a 20 degree differential is asking too much. JMO

Bob
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Old 09-14-2011, 10:49 AM   #16
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I've been told by airconditioning service techs that a 20 degree differential is all the unit will do.

A refrigeration unit however, like is in your tow vehicle, will eventually go much lower.
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Old 09-14-2011, 11:13 AM   #17
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.....and, as lewster has pointed out, both temps. are read inside the trailer, at the air dist. box, comparing the intake temp. to the discharge temp.
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Old 09-14-2011, 11:59 AM   #18
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The 20 degree rule is a design factor. Most AC units are designed to produce a 20 degree drop from intake to discharge temperature. That is just the economics of the design. More would be costly and in 90% of the time wasteful.

Setting the thermostat at a given temperature has NO EFFECT what so ever on the effectiveness of the unit. It can only do what it was designed to do. All this will insure is that the AC will run until it has been able to reach the set point. That will be a function of the reduction in the load on the AC, i.e. as the outside temperature drops.
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Old 09-14-2011, 12:19 PM   #19
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Quote:
Originally Posted by Pahaska
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.
A new breaker ought to do you. It is an often overlooked fact that circuit breakers are only really rated for the very first time they trip. It can be a bit of a craps shoot after that. At least with fuses you had to replace them when they blew!
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Old 09-14-2011, 01:16 PM   #20
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A circuit breaker is just a switch with some modification. If the contacts in the breaker have become pitted (tripping will pit them) and/or dirty (i.e. worn out), they will start presenting a resistance to the current, which will cause both a voltage drop and a heat build up. The voltage drop will cause the A/C to draw more current, and thus more heat and more voltage drop, and so on and so on. Soon the breaker will trip again. The bottom line to this long story is "Replace the Breaker". It is not expensive compared to eventually burning out the A/C motor while trying to figure out why the circuit breaker is popping.

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Old 09-14-2011, 02:18 PM   #21
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Had The Same Problem

Quote:
Originally Posted by Pahaska View Post
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.
I have a 2002 ASCL 31' and had the same problem; to the extent that Airstream Service authorized first replacing the AC unit and then authorized moving my circuit breaker box to the base of my street side bed (twins) when I advised them that I had called the circuit breaker company and was told that the breakers were only designed to withstand an ambient temperature of 140 degrees, which the upper storage locker readily exceeds.

That being said, it didn't stop my 2nd AC from tripping the breaker. As it ends up, Dometic had problems with their "fan start capacitors" in 2001 and 2002 which would trip the breaker at fan start-up. When the problem exibits itself I now just leave my fan on low and the AC functions correctly.
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Old 09-14-2011, 08:14 PM   #22
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Well, we were gone from our AS all day today. Left San Antonio at 8 am and got back at 7 pm. I told the wife if that damn AC was off and it was 104 in our AS, I was turning my AS into beer cans. It was on and running like a sewing machine. It was 77 in the trailer when we arrived. When we left, I turned off everything including the hot water heater (at 104, who needs the hot water heater on?). I opened up the cabinet with the breaker box, as suggested,for cooling; set the temp on the AC at 75 and the fan on high, also as suggested. I will do the same tomorrow as we will have a similar long day in the field. Many, many thanks for the great responses to my thread, it is REALLY appreciated(saved me from a $200+ motel room!!).

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Old 09-15-2011, 08:33 PM   #23
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Second day with no blown breaker. I may have licked my problem. I did the same routine; fan on high, temp set at 75, breaker box door open, and everything else electric off. It was a cool 75 after being gone all day. Not as hot today in San Antonio, only 98. So far so good.

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Old 09-22-2011, 09:50 AM   #24
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If the screw terminal on the breaker isn't tight, that will contribute to overheating and premature trips. It's not unusual for these to loosen over the years.

It's also fairly common for breakers to trip increasingly prematurely with age especially if there is wear due to switching under load. Breakers are cheap and easy to replace.
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Old 09-22-2011, 07:45 PM   #25
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Except for the first day, using the technique of fan on high, temp at 75 and everything else off with the cabinet to the breaker up, no more breaker blown. I have been doing this for over a week now and no more problems. I will check for loose breaker screws however, thanks.

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