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Old 09-24-2017, 02:19 PM   #201
Good Life
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Originally Posted by TheKothes View Post
Installed the PVC and cleaned out the sawdust. Tied up the wires as well. It is noticeably louder which tells me there is more air flow. We will find out on the next venture.
Did you cut the flanges off the registers that is sticking up in the duct? Mine were almost touching the top of the duct work?
I also added 3 more registers which will quieten down the rumbling you hear which is from pressure build up!
Also be sure to seal up the joints in the upper portion of foam shroud, if you didn't, turn on unit and go up there, you will be amazed of the cold air escaping!
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Old 09-24-2017, 02:22 PM   #202
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Seal up the joints in the upper portion of the foam shroud?? Where is this located? Also, how do you know where to add registers, and what tool did you use to cut the holes?
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Old 09-24-2017, 02:24 PM   #203
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I have not trimmed the registers yet. Done sweating for today. I did find out on this unit all of the registers are on a common zone. I found that design a bit odd. I did look at them and mine stick up about a half inch. I did tape up the foam shroud before I put the covers back on. What did you use to trim the flanges?
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Old 09-24-2017, 02:27 PM   #204
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On the roof when you take the cover off the AC there is a Styrofoam cover or shroud that is over the return air portion of the unit. You will want to check it for leaking air and tape/seal it up where you can to improve your efficiency. I suspect the ducts line up and there is a "raceway" duct from front to back. I am assuming that is what Good Life did when he added his registers.
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Old 09-24-2017, 02:29 PM   #205
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Seal up the joints in the upper portion of the foam shroud?? Where is this located? Also, how do you know where to add registers, and what tool did you use to cut the holes?
Up on top of your unit, remove the plastic cover,then the top half of the foam shroud which is the only way I could get to the coil to clean and get the bundle of wires out of the return plenum, I went in between the two rear vents and the next two over my Island-installed 1 in each side, then one towards the front of kitchen just behind the command center closet!
I used this: http://www.homedepot.com/p/Klein-Too...3731/203828012
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Old 09-24-2017, 02:35 PM   #206
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I have not trimmed the registers yet. Done sweating for today. I did find out on this unit all of the registers are on a common zone. I found that design a bit odd. I did look at them and mine stick up about a half inch. I did tape up the foam shroud before I put the covers back on. What did you use to trim the flanges?
1/2 " from flush will not hurt you, mine were almost touching the top of duct, I used a pair of straight cutting tin snips!
Also my unit has 2 common ducts running from front to rear, both a/c units dump into them!
I also removed the (4) return grills, took a marker and marked the inside max that it could be cut out and did so using a left/right tin snips, re taped the edge!
Before you reinstall the return grill base reach inside the duct towards the outside edges or trailer and vacuum the saw dust left by factory!!
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Old 09-24-2017, 03:12 PM   #207
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I`m not saying I don`t like my camper I do, front cap and a landing gear motor is the only issues I have had in 3 years with this unit, added 3 vents to the a/c and a dehumidifier to the unit and it`s better. I`m just saying a 3791RD is going to come with what issues? I have none now do I want to role the dice? I`ll just wait till Hershey in a few weeks and see what`s up.
I was at the Hershey RV show Sept 13th. Took us 3 days from 10 am to 8 pm to see campers, excluding motorcoaches. A lot of nice units. Montana has a considerably lighter interior. Like the new oblong look of fireplace. The light switch in bathroom is at the door so you don't have to fumble your way in to find it. I forgot to look to see if the couch platform is wider so that couch legs aren't hanging in mid air. This I did notice in SOB no issue with couch. The floors have the wider plank look and lighter in color. Cabinets sorta gray brown. In the 3000RE, which is now the 3130RE they put the frig on the other side of stove so now frig is accessible without opening slide. Would've traded in my mine except I just traded in my 2016 for a 2017 in January. Couldn't afford the hit. Plus Dad said, "Don't trade!" Overall nice show!! How did it go for you in your search?
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Old 09-24-2017, 05:49 PM   #208
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Good Life, how did you get a 12" piece of 1-1/2" sch 40 pvc pipe to go into the return vents? I just put in one 4" piece. I plan on doing more now that I see what you have done, but how did you get it in there?
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Old 09-24-2017, 06:49 PM   #209
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Good Life, how did you get a 12" piece of 1-1/2" sch 40 pvc pipe to go into the return vents? I just put in one 4" piece. I plan on doing more now that I see what you have done, but how did you get it in there?
I didn't use 1 1/2" sch 40, I used these http://www.homedepot.com/p/Everbilt-...9786/205153652
They also come in 12", you can roll them in thru your return air duct out by the outside walls by removing the grill and base!
I used a very small amount of glue to hold them together just so they didn't come apart and get lodged!
All you are trying to do is open the collapsed 2X12" duct kinda like a egg shape!
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Old 09-24-2017, 10:38 PM   #210
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You have to be very careful with installing the PVC into the air ducts. If you run into a tight spot and push, you can easily tear into the duct and now the air runs into the area above the ceiling. I found my duct work in the A/C return had collapsed. I saw a flex hose which was wire wrapped heavy soft plastic. It won't collapse and will not damage the duct. You have to pull off the A/C return cover and go up top and remove the Air Conditioner, then run a wire from the return vent to the A/C area to guide it and push it through. Then screw or glue it down in the A/C area to hold position. While you have the A/C out take a look at the venting. I saw very poor taping in that area. I also saw quite a bit of sawdust. Did this on both A/Cs. The air movement was very much improved. I used a IR thermal gun to check the temp of the A/C return, 76 degrees. Then checked the output, 55 degrees. Similar reading were found from the front A/C. The outside temp was 91 degrees. The temp rose in the unit to 80 degrees. I then checked the walls. On the side the sun was not hitting, the wall was 81 degrees. On the sunny side wall the temp read in the 90s. Inside the rear cabinet above the window the temp was 101 degrees. So if the A/C is functioning properly now, what's the problem. Draw your own conclusions, but I believe I figured out the cause.
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Old 09-25-2017, 09:26 AM   #211
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I believe you're right. Besides the fixes on the AC we also added 3/4 foam to the outside edge of all our cabinets and the laundry area and it also made a difference.
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Old 09-25-2017, 10:57 AM   #212
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See thread "air conditioner" by chasers. Lots of owners having problems with Ac system. I'm one of them.
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Old 09-25-2017, 02:46 PM   #213
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Supposedly Keystone is acknowledging that when they installed the roof insulation and then installed the roof it crushed the foam duct-work on some units. I believe this is now a know issue and dealers will start the modifications mentioned even though many of us have already done it with varying results.
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Old 09-27-2017, 08:00 PM   #214
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Supposedly Keystone is acknowledging that when they installed the roof insulation and then installed the roof it crushed the foam duct-work on some units. I believe this is now a know issue and dealers will start the modifications mentioned even though many of us have already done it with varying results.
When mine was at the factory for this and frame issues back in April, Keystone kept trying to blame Dometic, even though several of us had already seen the crushed ducts, high rimmed vents, sloppy made returns and too few of vents. How many hundreds of people telling you that you have a problem does it take for you realize or admit it? Since our unit has came back, it has been working better if we are on 50A. With 30A, no difference. So now we use the 2-30s to run both of the units and it has worked out well. Even FR came out with a solution that I posted way back, so it is about time they recognize and try to solve the problem.
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