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Old 07-25-2018, 06:24 PM   #21
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After reading a lot of the posts here I checked the return air ducts on my 2015 3711fl. I found them collapsed and the openings cut way smaller than the vent. I used a Dremel with a carbide endmill and trimmed the openings bigger, then taped with aluminum tape. Added the pvc in the center to open the ducts back up. I found new outlets at Dwinc on the web, model is 8850 and they are larger than the original outlets, adjustable, closeable and flow 20sq. inches of air, compared to the stock 12sq. inch ones. Used dremel tool to open hole to 5 7/8” then taped the gaps up between duct and ceiling. New outlets are 7/8 tall instead of sticking way up in the ducting. Replaced 4 in the front living area, 2 in the bedroom, 1 in the bathroom and added 2 in the kitchen where there were none. This worked great, very pleased with the cooling now.
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Old 07-25-2018, 08:40 PM   #22
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Has anyone made a iTunes of this or will there be a forum on this at the rally
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Old 07-25-2018, 09:03 PM   #23
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For a large number of reasons I doubt it, but there will be a number of us at the Rally that have done these mods and more. Our rig has these plus: added insulation, heat cutting window screens and a third AC that can run right along with the other two. That's the great thing about the National Rally. We learn alot from the Keystone arranged demonstrations and also from each other.
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Old 07-25-2018, 09:11 PM   #24
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Originally Posted by ingalmi View Post
A/C cycling, return ducts need to be free of restriction so check this first.
Next;
Pretty normal if operating in auto fan. Bedroom unit if it’s the front one will cycle more because of cooling room area. I use high fan on both until just before ready for bed then switch to low fan. Just personal preference. Here’s what some don’t know about, remove the thermostats off the wall (2 screws) and you’ll find a huge hole where they pass a small wire through. Guess what the thermostat is really reacting to? The inside of an uninsulated wall! Use tape or insulation to cover/plug the hole allowing enough room for the wire. Will make a difference in how the system works. Good luck and happy camping
Thank you for the information on the thermostat. I have a 2017 Montana 3000RE. My AC was cycling off and on, so I thought. After talking to Dometic, I was told the unit is working like it is supposed to work. Dometic told me to place the fan on high or low and it would stop the cycling, which it did. I thought the AC was cycling but it was the fan.The other thing I learned was to prevent the fan from cycling on Auto I had to close the bedroom door and within minutes after doing that it stopped cycling.
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Old 07-26-2018, 03:51 AM   #25
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Consider yourself lucky. Yes they have changed. After enduring complaints about the noise the older units like yours makes they came up with the Whisper Quite system. The return air on those units is near the sides of the ceiling and then it is ducted back to the unit. Dometic came up with the unit, but the real problem comes in how the manufacturers are installing them and Keystone isn't alone in that.

Thanks


I thought there was something even more wrong with me than normal LOL
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Old 07-26-2018, 05:55 AM   #26
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My 2017, built in February, doesn't have the plastic on the end of the return air that they added in the fall of 2017 and on. Would be interested to know if these actually solved the problem.
My unit was manufactured Spring 2018 and it does have a hard plastic 90 ell connecting the ductwork to the return register if that is what you are talking about. It also has what looks like a spacer in the middle of the return ductwork which I assume is supposed to prevent collapse (see my earlier post with picture). I was hoping someone with a pre-Fall2017 unit could tell me whether their unit has this spacer. I'm trying to determine what they actually changed. Been in our unit about 6 weeks now and so far, no problem with cooling and you can feel the air flow. Again, just trying to determine whether I need to go ahead and add the PVC pipe sections.
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Old 07-26-2018, 06:27 AM   #27
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My 3731FL was made in late March. I notice on my front unit, each return has 1 side blocked off with the metal tape. I want to say that on the ODS, it’s the forward facing side, and on the DS it’s the rear facing side of the returns that are blocked off on the front unit. I’ll have to check the rear unit, but is this the case for anyone else? Seems I read where someone mentioned each of their returns working both directions, and installing 8 pieces of pipe in the 4 returns, 1 facing each way. Maybe I misinterpreted?
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Old 07-26-2018, 11:22 AM   #28
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My unit was manufactured Spring 2018 and it does have a hard plastic 90 ell connecting the ductwork to the return register if that is what you are talking about. It also has what looks like a spacer in the middle of the return ductwork which I assume is supposed to prevent collapse (see my earlier post with picture). I was hoping someone with a pre-Fall2017 unit could tell me whether their unit has this spacer. I'm trying to determine what they actually changed. Been in our unit about 6 weeks now and so far, no problem with cooling and you can feel the air flow. Again, just trying to determine whether I need to go ahead and add the PVC pipe sections.
Sorry, missed you were looking for that. Mine does not have anything in the middle of the duct.
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Old 07-26-2018, 11:34 AM   #29
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Sorry, missed you were looking for that. Mine does not have anything in the middle of the duct.
Thanks DQDick. I was told they were going to make some modification Fall 2017, and that's one of the reasons I waited until Spring to order. I was trying to figure out exactly what they changed. So it looks like the plastic 90 ell and added the internal spacer. So far, so good. But I will be taking a look inside periodically for any signs of collapse. Thanks again.
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Old 07-26-2018, 05:30 PM   #30
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Our 2811MS was manufactured in June or July 2017. Our returns are not collapsed and I believe we have spacers in all 4. I did remove every other louver on the outlets. We have been pretty pleased to this point. We do utilize a portable fan or two just because we like moving air. I am sure this helps but not a necessity.
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Old 07-26-2018, 08:53 PM   #31
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Originally Posted by 2 Yoopers View Post
After reading a lot of the posts here I checked the return air ducts on my 2015 3711fl. I found them collapsed and the openings cut way smaller than the vent. I used a Dremel with a carbide endmill and trimmed the openings bigger, then taped with aluminum tape. Added the pvc in the center to open the ducts back up. I found new outlets at Dwinc on the web, model is 8850 and they are larger than the original outlets, adjustable, closeable and flow 20sq. inches of air, compared to the stock 12sq. inch ones. Used dremel tool to open hole to 5 7/8” then taped the gaps up between duct and ceiling. New outlets are 7/8 tall instead of sticking way up in the ducting. Replaced 4 in the front living area, 2 in the bedroom, 1 in the bathroom and added 2 in the kitchen where there were none. This worked great, very pleased with the cooling now.
I could not find a dwinc brand of vent on the web. Can you verify the brand please.
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Old 07-27-2018, 04:35 AM   #32
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Yes, it is Dwincorp.com. They handle quite a few of the outlets and other rv parts. I paid 6.00 for each outlet, includes the collar that screws into the ceiling and the snap in adjustable louver that covers the screws. Shipping was fast as well.
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Old 07-27-2018, 10:19 AM   #33
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Yes, it is Dwincorp.com. They handle quite a few of the outlets and other rv parts. I paid 6.00 for each outlet, includes the collar that screws into the ceiling and the snap in adjustable louver that covers the screws. Shipping was fast as well.
Ok I was goggling just dwinc
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Old 07-27-2018, 10:33 AM   #34
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https://www.dwincorp.com/product-cat...ucts/ac-vents/
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Old 07-27-2018, 11:04 AM   #35
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I found it thanks for the followup
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