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Old 07-20-2021, 09:36 AM   #1
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Managing 2 air conditioner airflow

Was out for a weekend trip with my buddy and decided to play around with the air conditioner vents. The rear a/c was running almost non-stop and it was only about 90 deg outside and cloudy. That bugged me. So we went investigating. For info, it's a 35' 5er rear living. Both a/c's are 15k Coleman Mach. When I bought the trailer, both thermostats were by the entry door. I moved the thermostat for the front a/c to the bedroom.

We figured out that both a/c units are ducted and they both have the vents on the a/c unit itself. What we did first was remove all the covers inside. Holy crap! There is a LOT of air flow and without any restriction, it blows straight down like a hurricane. So then we put cardboard over both inner covers so that all the airflow went into the ducts. That made the duct airflow much better, but the rear a/c was still working harder than the front one. What worked the best was to plug the front a/c so all airflow went into the ducts and left all the shrouds off the rear a/c so it did the hurricane thing. With that configuration, both a/c units ran about the same amount of time and they did not run nearly as long / often as the original configuration. I also really liked coming in from the heat and standing under the rear hurricane to cool off quickly. But no shrouds looks like crap, so I have to do something about that.

So, now I have a configuration that works, but not sure what to do with the rear a/c unit. I looked at the ABS inserts that cost their weight in gold, but that wouldn't really help me. The piece of cardboard up front does a great job of forcing everything into the ducts. So I don't see a need for that in the front a/c. I would like to have a way to set up the rear a/c so that it either goes 100% to the ducts or 100% straight down into the trailer (essentially a straight path through both shrouds, not going sideways into the dump vents on the outer shroud). Hope that makes sense.

Anyone ever done this?
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Old 07-20-2021, 09:45 AM   #2
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Sounds like you have what they call zones and the AC will only control that zone such as bedroom is probably zone 2 and living room zone one. Mine is set up that way and no way to make air go from one zone to the other. Later RJD
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Old 07-20-2021, 11:19 AM   #3
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Originally Posted by aceinspp View Post
Sounds like you have what they call zones and the AC will only control that zone such as bedroom is probably zone 2 and living room zone one. Mine is set up that way and no way to make air go from one zone to the other. Later RJD
When I run the front a/c, air comes out of all the ducts in the trailer. Same for the aft a/c. So both are hooked into all the vents.
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Old 07-21-2021, 12:07 PM   #4
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I got it the way I want it. I cut a hole in the outer shroud and put hinges on it. I also put a piece of cardboard in the inner shroud that I can slide to the side.

For max airflow:

1. Open little door
2. Slide cardboard to the side

This allows direct flow straight down out of the a/c. This is nice for initial cooling and to stand under when I am hot.

For regular operation, I will slide the cardboard over to block all flow to the outer shroud which will force all flow into the ducts. Then I just close the outer door.

I can also set it up as it is from the factory by just sliding the cardboard to the side and closing the outer door. This will allow me to use the factory dump vents but I'm not sure why I would want to do that.

Life is good.
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Old 07-22-2021, 02:38 PM   #5
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Cool Air Conditioning Airflow

There is a product for RV air conditioners to vastly improve airflow in your AC vents. The product is manufactured by RV Airflow Systems. You can find the products at
https://rvairflow.com/

or you can check out the following link to make your own modification for about $10 to $15.


I decided to build my own because RV Airflow's product would not fit my AC unit. It was easy to do and works fantastically. Some of the vents improved easily by 50%.
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Old 07-22-2021, 04:47 PM   #6
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Your main A/C grills have air dumps that can be opened or closed with the sliding vent covers. Did adjusting these not accomplish the same thing? When they are closed all air goes into the ducts.
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Old 07-22-2021, 05:34 PM   #7
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Cool Managing 2 air conditioner airflow

The AC plenum box must have been hastily put together as there were so many leaks that some of my vents were not getting any detectible air flow at all (especially over the driver and passenger seats). We had to use the air dumps just to try and cool the RV as the vents did not circulate nearly enough air.

After a thorough taping of the plenum box to stop all the leaks, and installing the modification indicated above, the difference is unbelievable. The modification eliminates most of the turbulence so the AC runs quieter. It also distributes the air much more evenly thru the vents.

We have two AC units and had to perform the mods on both units. However as noted in the video, once you make the mods, the air dump is not useable.
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Old 07-23-2021, 05:31 PM   #8
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Quote:
Originally Posted by southbaytaekwondo View Post
The AC plenum box must have been hastily put together as there were so many leaks that some of my vents were not getting any detectible air flow at all (especially over the driver and passenger seats). We had to use the air dumps just to try and cool the RV as the vents did not circulate nearly enough air.

After a thorough taping of the plenum box to stop all the leaks, and installing the modification indicated above, the difference is unbelievable. The modification eliminates most of the turbulence so the AC runs quieter. It also distributes the air much more evenly thru the vents.

We have two AC units and had to perform the mods on both units. However as noted in the video, once you make the mods, the air dump is not useable.
I just did this to the front a/c. Makes a huge difference. I did not install the triangle inside. The squirrel fan was biased a lot to the starboard side and I didn't think the triangle would make that any better. So I just taped up the entire existing plenum (including the shroud up into the a/c around the squirrel fan) and then installed the foam board and taped it all up. Compared to the a/c in the rear, there are no leaks and it is a lot quieter.

I did have a question about dual a/c feeding the same ducts. If I do this mod to both a/c, they will be feeding the same ducts but in opposite directions. I wonder if that creates back pressure at each a/c that makes them less efficient? Just spitballing here.
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