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Old 08-07-2020, 11:40 AM   #1
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AC Unit

Goodmorning all. Was wondering if any of you have experienced this. It seems only to happen in summertime here in South Florida. I'm having a situation with my ac. It does not have a indoor thermostat. It's a basic on the roof AC and you regulate flow of air inside with the knob. You know low fan, high fan, low cool, and high cool.
This has happened about 3 times and like I said in hot months. It will run all day working fine. When night time hits, usually in early AM hours it blows very little air. I took Camping World and they did multiple tests with it and they never experienced this.

So I was wondering if any of you have had this issue. Winter months for some reason is not an issue. Only in summer months

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Old 08-07-2020, 12:36 PM   #2
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Sounds like it's freezing up the evaporator overnight.
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Old 08-07-2020, 01:40 PM   #3
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the 'summer months' with both heat AND humidity can create issues, if the air is running 'all night', as you suggest. As the humidity and 'morning dew' start settling very heavily, it's common for any air unit to struggle. Your unit does not have it's own 'temp control', as it's either ON, or it's OFF, so the compressor is ALWAYS engaged if on the 'Low' or 'High' cooling settings.
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Old 08-07-2020, 03:26 PM   #4
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I've never seen an A/C without at least a manual thermostat control:



So the compressor will not run all the time UNLESS you crank the thermostat all the way to the cool side thinking it will cool the space faster (it does not).

On my TTs and TCs with this type of A/C I always put a mark on the thermostat where the maintained temperature is what we considered to be comfortable.
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Old 08-07-2020, 06:32 PM   #5
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Quote:
Originally Posted by 16ACE27 View Post
Sounds like it's freezing up the evaporator overnight.
Basically reinforcing this response.

Your AC is freezing a block of ice blocking the air flow.

IF it runs continuously without cycling, it does not have any time to thaw the frost that may be developing on the cooling coils. This is a particularly perplexing problem in humid climates and when it is challenging the capacity of your system.

AS others said, turn the thermostat to a warmer temperature (so the compressor can cycle). If you cannot get your RV cold enough this way, then maybe you will have to find ways to reduce the cooling load demand (insulate windows, seal cracks, etc.)

By the way, this is not unique to RVs; my house AC will freeze a block of ice and nearly block the air flow also.

And systems that are on the low side of normal for the freon charge pressure are more likely to freeze also.

JIm (SDB)
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Old 08-07-2020, 06:50 PM   #6
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Correct low gas or low air movement. Have this fixed or you will kill your compressor. Any AC repair shop can fix it. If you have a ladder they may come to your house. I have mine cleaned and checked every year by local residential ac company with my ladder. 75 dollars to clean and check pressures.
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Old 08-08-2020, 11:58 AM   #7
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Thanks for the info
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Old 08-08-2020, 11:59 AM   #8
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Good to know thanks
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Old 08-08-2020, 12:00 PM   #9
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This is great info. Thanks for tje reply
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Old 08-08-2020, 12:01 PM   #10
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Will do thanks
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Old 08-16-2020, 12:21 AM   #11
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I know that this is a later reply, but some have purchased a stand alone portable AC and have used coroplast to make a window block and exhaust the air out side. This will allow you to keep your RV cool in the hot Florida humid air and run the ceiling AC at a warmer setting allowing it not to freeze up. 4K to 14K BTU from $270 to $510. There is a 14K Black and Decker for just under $400. It may keep your RV cooler on the hottest days as well.

https://www.amazon.com/portable-air-...b?node=1193678
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Old 08-16-2020, 12:31 AM   #12
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Take the ceiling unit off and check if the temperature probe is still inserted in the evaporator coil.
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Old 08-16-2020, 01:08 PM   #13
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It is your temperature sensor. Even when turned down to low it is supposed to prevent the coil from freezing. If the probe is in the coil, it may be time to replace the sensor. It is most likely a mechanical type and is very easy to replace.
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Old 08-16-2020, 01:50 PM   #14
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This worked. Really appreciate the input. Set thermostat a bit warmer. Still cooled rv.
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Old 08-18-2020, 01:03 AM   #15
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If you have the option set the fan to run on high (not auto). This way the fan will blow even when the compressor shuts off and it will help to more quickly defrost any ice accumulation.
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Old 08-27-2020, 01:21 AM   #16
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Yep thats what i think too maybe check the air filter or screen not enough air flow in cooler evening temps might be the cause
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