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06-08-2018, 10:34 AM
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#1
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New Member
Join Date: Mar 2018
Location: Bonney Lake
Posts: 9
M.O.C. #21387
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Ceiling vents
We recently purchased a 3791RD. I see these vents in the ceiling (see attached photo) but I can't figure out what they are for. The heat comes out of floor registers and the A/C only comes out at the one unit above the fireplace. Anyone know what these are for?
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06-08-2018, 10:39 AM
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#2
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 4,081
M.O.C. #20477
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They should all be A/C ducts.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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06-08-2018, 11:48 AM
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#3
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Montana Master
Join Date: May 2018
Location: livingston,tx
Posts: 569
M.O.C. #21685
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We have a 3790RD, those are your ac and heat pump vents in the living room and kitchen, ac only in the bedroom. Heat out of the floor is the furnace.
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06-08-2018, 12:24 PM
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#4
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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If you aren't getting AC out of those vents you have a serious problem. Your air flow is restricted, most likely on the return air side and lack of air flow will result in the unit freezing up in addition to you not getting cool. It could also be an issue with the return air and supply air ducts not being aligned right under the AC unit. Since the rig is new, I'd take it back to the dealer and make them fix it. The exception to this is if your unit is older and has the older style AC unit. In that case, the vent on the bottom of the AC unit can be closed and air then goes down the ducts to those registers.
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06-08-2018, 12:25 PM
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#5
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Montana Master
Join Date: Jan 2016
Location: STAYTON
Posts: 1,118
M.O.C. #18157
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Quote:
Originally Posted by Machfun
We recently purchased a 3791RD. I see these vents in the ceiling (see attached photo) but I can't figure out what they are for. The heat comes out of floor registers and the A/C only comes out at the one unit above the fireplace. Anyone know what these are for?
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Close the ‘dump’ register on the A/C. That will run the air into the ductwork.
Mark
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06-08-2018, 04:37 PM
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#6
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Seasoned Camper
Join Date: May 2018
Location: Amarillo
Posts: 64
M.O.C. #21742
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Quote:
Originally Posted by MARK A
Close the ‘dump’ register on the A/C. That will run the air into the ductwork.
Mark
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That's a new one to me but what is the dump register and where is it?
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06-08-2018, 06:53 PM
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#7
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Montana Master
Join Date: May 2017
Location: South East NC
Posts: 1,768
M.O.C. #19865
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No dump register on the new 15K units. If no AC coming out the vents it is going into the attic from the main unit. The bedroom unit will have the dump gate.
__________________
John & Patty
2022 3855 BR
2019 Lariat F350 4X4 Dually
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06-08-2018, 07:05 PM
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#8
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 4,081
M.O.C. #20477
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Quote:
Originally Posted by CaptnJohn
No dump register on the new 15K units. If no AC coming out the vents it is going into the attic from the main unit. The bedroom unit will have the dump gate.
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John,
My rig does not have a dump gate in the bedroom either. Most all the newer rigs have two 15K units.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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06-08-2018, 09:14 PM
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#9
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Quote:
Originally Posted by knapper42
That's a new one to me but what is the dump register and where is it?
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In the older Montanas the units the AC stuck down into the rig. One side of the vent that stuck down was the return air, the other half was a dump register that you could open and most of the cold air would come out right there. You could adjust the dump, however, and send some or all of the air down the ducts to the round supply vents in the ceiling depending on what you wanted or needed.
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06-09-2018, 02:52 PM
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#10
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Montana Master
Join Date: Aug 2015
Location: SWFL
Posts: 965
M.O.C. #17801
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If you're not getting air from those AC diffusers, they're probably blocked, and shame on Keystone, again, for allowing units out the door with crushed ducting. You must not be in a hot location. Here in FL, we need every bit of the air flow.
__________________
2016 Montana 3711FL
2005 Ford F350, 6.0 diesel, short bed
Demco Hitchiker Auto Slide hitch
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06-09-2018, 03:35 PM
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#11
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Montana Master
Join Date: Jan 2005
Location: North Ridgeville
Posts: 20,229
M.O.C. #2839
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I am going to have to take a real close look while on the factory tour at the fall rally to see how they manage to crush the A/C ducting.
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06-09-2018, 03:38 PM
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#12
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Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
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you and me both LOL
__________________
Mocha, one-eyed toothless, hurricane survivor, Pirate dog
2019 20th Anniversary Edition 3701LK
B&W 20K for Ford OEM Puck
2018 Ford F-350 Lariat CCLB PSD DRW KJ5CQH
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06-09-2018, 06:24 PM
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#13
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Montana Master
Join Date: Jan 2018
Location: Thornville
Posts: 546
M.O.C. #21110
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I thought that I had read somewhere,Keystone has started using a "new and improved" ductwork, to prevent the crushing and collapsing issues. Was supposed to start with the 2018 model year was what I think it said.
__________________
Darwin & Carla
2018.5 3701LK Montana
2022 3500HD Denali Duramax SRW
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06-10-2018, 03:32 AM
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#14
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Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
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New and improved does not mean they have fixed it yet. We are going to the Rally in Goshen. This is on my "list".
__________________
Mocha, one-eyed toothless, hurricane survivor, Pirate dog
2019 20th Anniversary Edition 3701LK
B&W 20K for Ford OEM Puck
2018 Ford F-350 Lariat CCLB PSD DRW KJ5CQH
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06-10-2018, 09:32 AM
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#15
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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When we bring up the AC issues let's also bring up why Keystone is still putting Tetford toilets in when so many of us have to change to Dometic right away.
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06-10-2018, 10:12 AM
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#16
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Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
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LOL I pity the poor person who draws the short straw for tour guide
__________________
Mocha, one-eyed toothless, hurricane survivor, Pirate dog
2019 20th Anniversary Edition 3701LK
B&W 20K for Ford OEM Puck
2018 Ford F-350 Lariat CCLB PSD DRW KJ5CQH
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06-10-2018, 10:32 AM
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#17
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Montana Master
Join Date: May 2017
Location: South East NC
Posts: 1,768
M.O.C. #19865
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Quote:
Originally Posted by DQDick
When we bring up the AC issues let's also bring up why Keystone is still putting Tetford toilets in when so many of us have to change to Dometic right away.
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Simple answer ~~ Thetford are cheaper. They work for a while, until they don't.
__________________
John & Patty
2022 3855 BR
2019 Lariat F350 4X4 Dually
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06-10-2018, 10:39 AM
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#18
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Montana Master
Join Date: Jan 2005
Location: North Ridgeville
Posts: 20,229
M.O.C. #2839
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Quote:
Originally Posted by CaptnJohn
Simple answer ~~ Thetford are cheaper. They work for a while, until they don't.
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I am in on that. Many of us use these things a lot harder than the average user. Remember the R in RV stands for "recreational" living it in full time or most of the year and doing thousands of miles every year is not IMO recreational.
Many will never have a Thetford problem as they do not use them that much.
They build them for the average user and I am not the average user.
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06-10-2018, 11:04 AM
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#19
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Montana Master
Join Date: May 2017
Location: South East NC
Posts: 1,768
M.O.C. #19865
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Quote:
Originally Posted by richfaa
I am in on that. Many of us use these things a lot harder than the average user. Remember the R in RV stands for "recreational" living it in full time or most of the year and doing thousands of miles every year is not IMO recreational.
Many will never have a Thetford problem as they do not use them that much.
They build them for the average user and I am not the average user.
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Probably a large percentage of Montana and HC owners are like you. We are using ours 6 - 7 months annually. This means several trips of 600 to several thousand miles and from 2 weeks to 3 months. Yet, 50 cents on every Montana and HC saved may be someone in purchasing getting a huge bonus.
__________________
John & Patty
2022 3855 BR
2019 Lariat F350 4X4 Dually
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06-10-2018, 11:14 AM
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#20
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Montana Master
Join Date: Jan 2005
Location: North Ridgeville
Posts: 20,229
M.O.C. #2839
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Quote:
Originally Posted by CaptnJohn
Probably a large percentage of Montana and HC owners are like you. We are using ours 6 - 7 months annually. This means several trips of 600 to several thousand miles and from 2 weeks to 3 months. Yet, 50 cents on every Montana and HC saved may be someone in purchasing getting a huge bonus.
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The RV industry is very competitive and penny's' add up to thousands of dollars
I had posted that a 200.00 difference in price could mean the difference between buy or no buy to the consumer and many did not believe that. We sold them at large RV shows and it does make a difference. The average RV buyer knows surprisingly little about Rv's except what are the monthly payments.
People would look at a Montana and ask how come this cost more than that Cougar next line over.They both look the same.
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