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Old 09-20-2016, 03:13 PM   #51
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I would be interested in adding the HI/LOW fan switch since there is considerable difference between the noise and the air movement between the two on my unit. Have you considered installing this fan switch?
I did but we run on low all the time because it is quieter. Once I redesigned the airflow ducts from the A/C, sealed the air leaks in the ducts from the tank vents, I get more air out of the system on low than it ever did on high before.

Here is a link to a youtube video adding the fan control switch.
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Old 09-20-2016, 03:40 PM   #52
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So how exactly did you redesign the ductwork? Are yours not all tucked up above the ceiling? (I'm obviously referring to the A/C ducts, not the heat.) I would be interested in knowing more since the ducts at either end of my RV offer very little air flow on the low fan speed setting.
The rear of my unit also includes 2 opposing slide outs and the heat distribution back there is poor as well. The previous owner put in a separate thermostatically controlled receptacle for a small space heater that is plugged directly into the campground pedestal.
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Old 09-20-2016, 05:34 PM   #53
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Well for starters I accidentally found out that the manufacturer had vented the black and grey tanks right through the left side A/C ducts. My TT has two channels running through the roof down each side to which the manufacturer cuts out holes to place vents into. Anyway, A/C air was pushing down through the holes around the vent pipes all the way out the bottom on top of both tanks. I could feel the cool air rushing out when I reached on top of the tank. That is cool air that is not going to my vents and cooling the inside. I removed the vent caps completely and using expansion foam sealed around the pipe at the bottom of the duct and then at the top before reinstalling the vent caps.

Next while trying to find a leak around the A/C itself I found that the discharge air was being directed directly to the ducts by sheer pressure. The air was buffeting flatly against the aluminum frame and styrofoam insulation creating a large buildup of turbulence. I took the same expansion foam and filled in the whole area at the beginning of the ducts, including filling the hollow aluminum frame. After curing, I took a long straight knife and cut through the cured expansion foam to the open ducts being sure to cut them at angles to assist in a more streamline airflow. In doing so the angled cuts in the foam redirected the air flow smoothly into the ducts.

I now have so much air flowing through all the vents that it cools the whole camper in mere minutes.

I took a couple of pics but without dropping the whole bottom this was the best I could get.

Pic 1 - I covered all metal. Including the support along the top to fix a leak that you can't see because of the foam.
Pic 2 - If you look to the left behind the screw that used to be styrofoam that came out several more inches from the left. I cut it away and slanted it back into the duct.

Sorry I don't have better pics of the actual work.
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Old 09-21-2016, 08:30 AM   #54
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WOW!! That's amazing that you would have thought to look for those issues. I guess I need to take down the bottom of the A/C unit just to see what is going on. Also may be worthwhile to pull the individual diffusers out to see how well they are sealed to the duct.
Thanks for the info and for posting the photos.
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Old 09-28-2016, 12:35 AM   #55
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Take your phone or digital camera and take a pic in both directions up in the vent hole. You should be able to see end to end. When I took one I could see the black vent pipe cutting through mine.
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Old 09-28-2016, 02:57 PM   #56
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Here is a pic looking down the duct. You can see to the left the vent pipe cutting through and the foam I used to seal it. You can also see a 12v wire cutting right through the duct as well. The manufacturer doesn't seem to care anything about doing a professional job.

You can see in the second pic that they cut right into the duct for a ceiling light. Cold air blows out all through the fixture as it is located less than a foot from the A/C unit. If they would have put it 1 inch further to the right the A/C duct would be intact and there would be no air loss.
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Old 10-05-2016, 08:32 AM   #57
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Thanks for the additional information and the photos. When I get the camper back home, I will check this out on mine to see if I have any obstructions in the duct work.
I did install the Honeywell thermostat this weekend using your wiring suggestions and it worked perfectly. I think that I will hold off on installing the hi/lo fan switch to see if I really need it. Thanks so much for the help!
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Old 10-05-2016, 01:22 PM   #58
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Thanks for the additional information and the photos. When I get the camper back home, I will check this out on mine to see if I have any obstructions in the duct work.
I did install the Honeywell thermostat this weekend using your wiring suggestions and it worked perfectly. I think that I will hold off on installing the hi/lo fan switch to see if I really need it. Thanks so much for the help!
I have a Honeywell and i never installed the hi/lo switch since I wired it for high only.
Never needed the low setting and the a/c runs better on high.
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Old 10-05-2016, 02:03 PM   #59
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Dan,
I did just the opposite. I wired mine for the low setting since that is the one that we use the most. The only time that I ever used the high setting in the past was when the trailer had been sitting in the sun for a long time and it was very hot inside. I would leave the system fan on high for about 15 minutes and then turn it down to low for the remainder of the time we were camping.
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Old 12-03-2016, 11:54 AM   #60
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Ya know! I wired in the hi-lo switch and can't tell the difference!
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