Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
 

Go Back   Keystone RV Forums > Keystone Fleet | Keystone RV Models > Fifth Wheels
Click Here to Login

Reply
 
Thread Tools Display Modes
 
Old 07-21-2021, 09:45 AM   #1
BDove
Junior Member
 
BDove's Avatar
 
Join Date: Jul 2021
Location: Shepherd
Posts: 14
Duct Diagram

Anyone have a diagram of the overhead AC ducting for 2021 Alpine 3700FL with two AC units?
BDove is offline   Reply With Quote
Old 07-21-2021, 10:40 AM   #2
chuckster57
Site Team
 
chuckster57's Avatar
 
Join Date: Jul 2014
Location: Modesto
Posts: 14,637
Unless you see it in a sales brochure, your not going to find a schematic available to the public.

If your having air flow issues there are fixes depending on the style you have. Does your have 2 ceiling assemblies with the “dump” grill and return filter?
__________________

2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.

Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
chuckster57 is offline   Reply With Quote
Old 07-21-2021, 11:22 AM   #3
Javi
Senior Member
 
Join Date: Aug 2012
Location: Waco, Tx
Posts: 4,967
Quote:
Originally Posted by chuckster57 View Post
Unless you see it in a sales brochure, your not going to find a schematic available to the public.

If your having air flow issues there are fixes depending on the style you have. Does your have 2 ceiling assemblies with the “dump” grill and return filter?
Chuck, he has a 2021 Alpine so I'm thinking it's like my Avalanche and closed..

I re-taped both the living area and the bedroom intake/filter ducts and all the registers on mine before we replaced the bedroom A/C. When they pulled the A/C off the roof, the ducting was also poorly taped. So I paid them to pull the living room A/C and re-tape it also... As I said it made a huge difference in air flow and the upgrade to 15K in the bedroom is fantastic..
Javi is offline   Reply With Quote
Old 07-22-2021, 03:32 AM   #4
BDove
Junior Member
 
BDove's Avatar
 
Join Date: Jul 2021
Location: Shepherd
Posts: 14
I do not have the ceiling assemblies. I have seen the fixes for those. I am assuming the ceiling panels will have to be removed to access the ducting and plenum. I will leave that to dealer and warranty.
BDove is offline   Reply With Quote
Old 07-22-2021, 06:31 AM   #5
Rkmarple
Junior Member
 
Join Date: Apr 2021
Location: Stillwater
Posts: 11
Quote:
Originally Posted by BDove View Post
Anyone have a diagram of the overhead AC ducting for 2021 Alpine 3700FL with two AC units?
Just had my 2021 Alpine repaired.
NOTE TO ALL: Poor manufacturing problem as noted by Lewis RV in OKC By Keystone!
Too much Spray insulation under both AC plenums blocked return air flow.
Also, foam board insulation within top of return air duct sagging down restricting airflow. Dealer noted same issue on multiple units!
Dealer had to pull AC units and also remove inside ceiling panels to repair.
Result plenty of air flow and cooling from both units.
Inspection technique by me was an endoscope (Amazon) which allowed me to view ducts on my iPhone via Bluetooth.

If having low airflow on new Keystone units, better check.
Rkmarple is offline   Reply With Quote
Old 07-22-2021, 09:42 AM   #6
BDove
Junior Member
 
BDove's Avatar
 
Join Date: Jul 2021
Location: Shepherd
Posts: 14
Thanks Rkmarple! I will show the dealer this post when I take it in.
BDove is offline   Reply With Quote
Old 07-22-2021, 12:48 PM   #7
ChuckS
Senior Member
 
ChuckS's Avatar
 
Join Date: Mar 2014
Location: Mountain Home, Idaho
Posts: 1,862
Typical of what is being seen under the new 2021 Alpine A/C units…

Images from a group I am in.. only way to fix is remove the A/c units and clean up the mess

Show to your dealer …this is what will be seen
Attached Thumbnails
Click image for larger version

Name:	F07F9F60-0D43-4E7B-9EE8-69192D2A41FA.jpeg
Views:	57
Size:	476.2 KB
ID:	34817   Click image for larger version

Name:	B5221EF0-2D16-4D72-A7D4-FB0E2C72EFCC.jpg
Views:	46
Size:	201.6 KB
ID:	34818  
__________________


2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
ChuckS is offline   Reply With Quote
Old 07-22-2021, 02:18 PM   #8
Javi
Senior Member
 
Join Date: Aug 2012
Location: Waco, Tx
Posts: 4,967
Quote:
Originally Posted by ChuckS View Post
Typical of what is being seen under the new 2021 Alpine A/C units…

Images from a group I am in.. only way to fix is remove the A/c units and clean up the mess

Show to your dealer …this is what will be seen
Avalanche as well...
Javi is offline   Reply With Quote
Old 07-23-2021, 08:24 AM   #9
BDove
Junior Member
 
BDove's Avatar
 
Join Date: Jul 2021
Location: Shepherd
Posts: 14
Thanks, I will show them this. What a mess.
BDove is offline   Reply With Quote
Old 07-23-2021, 08:29 AM   #10
BDove
Junior Member
 
BDove's Avatar
 
Join Date: Jul 2021
Location: Shepherd
Posts: 14
You would think the installers would notice that, or at least QC. Apparently QC is absent.
BDove is offline   Reply With Quote
Old 07-27-2021, 04:42 AM   #11
browntl2454
Junior Member
 
Join Date: Jul 2020
Location: Waverly
Posts: 9
We have our 2021 Montana High Country in for warrantee issues. We had been in Colorado for a week. The temperature was in the 80s, and we had both air conditioners operating, and they weren't cooling properly. The service tech called and told me that the returns were almost taped shut, and the ceiling vents holes weren't cut out big enough. I guess it was something that got passed QC.
browntl2454 is offline   Reply With Quote
Old 07-27-2021, 05:40 AM   #12
BDove
Junior Member
 
BDove's Avatar
 
Join Date: Jul 2021
Location: Shepherd
Posts: 14
Thanks. Yes my returns have zero airflow going back in. I looked in return duct, it is partially collapsed and not sure if it is sealed properly. Probably blocked in plenum as well.
BDove is offline   Reply With Quote
Old 07-29-2021, 09:09 AM   #13
takpak
Member
 
takpak's Avatar
 
Join Date: Mar 2015
Location: Hillsboro
Posts: 38
ductwork

After having our 2017 Montana all these years, I finally got into the discharge louvers. We have two 15K units, main and bed areas. First year, I checked and improved the return plenums with the PVC pipe method and made sure they were open and free flowing. This year, I finally got around to checking the discharge vents, and what a mess. Bad sealing, some holes not cut right, etc. Nothing really serious, but it all adds up. Took down each assembly, and cut about an inch off the louver "pipe" so it doesn't protrude into the ductwork. That helped. Then re-taped each and every hole so it doesn't just blow into the ceiling area. Found a couple of them that were pretty bad and misaligned. All back together now, and it does seem to have better airflow. We shall see, come a hot day.....or cool day when using the heat pump feature.
__________________
Terry K.
Vietnam Veteran, US Navy reserve 1969-1975 (active 1970-72)
Retired
2017 Montana 3810
2015 GMC SLT K3500 double cab, SRW, Duramax/Allison
takpak is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by the Keystone RV Company or any of its affiliates in any way. Keystone RV® is a registered trademark of the Keystone RV Company.


All times are GMT -8. The time now is 09:21 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2021, vBulletin Solutions, Inc.