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Old 07-25-2021, 09:53 AM   #1
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Air conditioner

I live just north of Corpus Christi, TX where I keep my TT in my driveway. Yesterday, it was 95 outside the TT. At about 3:00 PM I went into TT where it was very hot, high humidity and sweating. AC did not seem to be working very well. This morning I purchased an analog temperature probe. Outside TT temp at 10:00 AM was 95 and AC outlet showed 75 which was about 20 degree difference form outside TT to AC outlet. I had thermostat set at 75. I have a Coleman 1500 AC. For reference I checked pickup AC outlet and it was 55.
Is my TT AC working or maybe it just cannot keep up with high outside temps?
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Old 07-25-2021, 10:19 AM   #2
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20 degrees below ambient temp is about normal for an RV AC unit. A better insulated trailer will help keep the cool in longer than one with drafts and little insulation. You can look behind the inside grill cover and make sure the baffle is in place that separates the incoming and outgoing air. That can make a huge difference if it is misaligned.
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Old 07-25-2021, 01:20 PM   #3
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The 20 degF is not from the ambient to inside. The only way to check the performance of the A/C is to set the fan on high and after about 10 minutes operation. Now take a reading for the air entering the unit and then the closest duct or outlet to the unit. If it is reading 18 to 20 degF lower at the outlet, the unit is performing to its maximum. If not, you need to do more trouble shooting.

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Old 07-27-2021, 01:43 PM   #4
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A follow up on my AC problem. I called a mobile tech. He said very low on freon after running some tests. Must be replaced because it is a sealed unit. Cannot fix leak and add freon. Today, I had it replaced. Now very cold inside and working great.
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Old 07-27-2021, 06:22 PM   #5
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many ducted AC units have poor installation and can benefit from looking at the details of how they are installed. I found a piece of foam pushed out that sealed off the return and supply sides , the air was never getting to the coach it just went right back in the return path and short cycled 20% or more of the air. The hole was 14" wide and 1 1/4" the foam pushed out of. Both of my AC units had the same issue.
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Old 08-01-2021, 09:51 AM   #6
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New or old a/c unit, the way to know how it is working remains the same.
Quote:
take a reading for the air entering the unit and then the closest duct or outlet to the unit. If it is reading 18 to 20 degF lower at the outlet, the unit is performing to its maximum.
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