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06-05-2016, 02:43 PM
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#1
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Junior Member
Join Date: Apr 2013
Posts: 24
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one a/c not sending air through vents
Hello. I have 2 new dometic 15's on my wildwood 408 reds. I've only had one a/c before and I would use a window unit when needed. With the one unit I would have a cold bedroom and bathroom but the big room (kitchen, living room, big left and right slideouts) would be warm. The a/c vents at the end of the rv hardly blew air.
Now I have two a/c's. The a/c that is mounted in the bedroom (never had one there prior) does not seem to send air through any vent when it is the only air powered on. When I have both a/c's on I feel a noticible difference of stronger airflow through the living room vents so the bedroom mounted a/c is doing something but when the bedroom a/c is on by itself there is no air flowing through any vent. I can open the vent adjacent to the filter and she will blow like a hurricane but with that vent closed she wont send air out of any duct vent but she will noticebly assist the flow through the ducts when both air are on.
Figured I'd post this before I get on the tech who installed the a/c's.
thank you
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06-06-2016, 11:31 AM
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#2
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Junior Member
Join Date: Apr 2013
Posts: 24
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anyone?
thanks
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06-06-2016, 01:15 PM
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#3
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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I'm not sure that the ducting on the two A/C's are tied together?
Does the other A/C blow air out the quick cool vents of the bedroom A/C when it's on?
Have you pulled the grill off the bedroom unit to see if it's connected to the duct work.
__________________
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin! 
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06-06-2016, 05:59 PM
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#4
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Junior Member
Join Date: Apr 2013
Posts: 24
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The local rv guy who installed it niw says that the unit is stand alone and not capable to be ducted.
Seems like a waste of money. The bedroom and bathroom were always cold with the single unit. The big room was always warm. I always had a $100.00 window unit that took care of that and still have to use it.
oh well.
thanks for y'all's time.
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06-06-2016, 08:26 PM
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#5
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Senior Member
Join Date: Sep 2010
Posts: 2,219
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I thought that most of 2nd AC units are non ducted.
2010 F250 5.4L 3.73
2011 Flagstaff 831FKBSS
Equal-i-zer 4pt 12K
__________________
2011 Flagstaff 831FKBSS
2010 F250 4X4 5.4L 3.73 LS
EQUALIZER E4 1200/12000
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06-06-2016, 09:30 PM
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#6
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Junior Member
Join Date: Apr 2013
Posts: 24
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Live and learn I guess.
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06-07-2016, 12:39 PM
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#7
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CDR USN Ret
Join Date: Oct 2015
Location: Full-Time
Posts: 105
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Quote:
Originally Posted by lbrjet
I thought that most of 2nd AC units are non ducted.
2010 F250 5.4L 3.73
2011 Flagstaff 831FKBSS
Equal-i-zer 4pt 12K
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If both fed a single supply duct, when both were running, their fans would be fighting each other and very little air would flow.
__________________
2015 XLR415AMP
2011 3500HD Duramax/Allison/90 Gal Aux
2015 HD Limited Low
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06-07-2016, 12:53 PM
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#8
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Senior Member
Join Date: Oct 2013
Posts: 145
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My new 2015 Rockwood TT has 2 a/c vents in bedroom and one not blowing cold air. Long story short, one of the vents was not connected from the factory. Hard to believe. I guess many would say "not really". Dealer did the repair no problem.
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06-07-2016, 01:05 PM
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#9
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
Originally Posted by DSQR
If both fed a single supply duct, when both were running, their fans would be fighting each other and very little air would flow.
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Not true whatsoever!
I have two ducted a/c units "I installed the second" and I doubled my air flow in every vent.
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
2016 nights camped "10"
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06-07-2016, 01:06 PM
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#10
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
Originally Posted by kdc1899
The local rv guy who installed it niw says that the unit is stand alone and not capable to be ducted.
Seems like a waste of money. The bedroom and bathroom were always cold with the single unit. The big room was always warm. I always had a $100.00 window unit that took care of that and still have to use it.
oh well.
thanks for y'all's time.
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Are the a/c controls on the unit or do you have a thermostat?
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
2016 nights camped "10"
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06-07-2016, 01:19 PM
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#11
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Op pm sent
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
2016 nights camped "10"
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06-07-2016, 01:19 PM
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#12
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7 Year Class A RV'er
Join Date: Oct 2014
Location: Winter Park, FL
Posts: 1,068
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So far as I can tell, our second AC is not ducted. It simply dumps into the bedroom, straight down on the bed (which is the preferred scenario from my wife at this time in our lives!). When only the rear AC is running, I do feel some very slight airflow through the ducts but I think it's just the pressure equalizing through the coach. If both were ducted and running at the same time, you'd have the airflow from each direction fighting one another inside the ducts.
__________________
2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad
Gigi, Poppy and Sadie Lady...On the road, but not full time!
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06-07-2016, 01:26 PM
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#13
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
Originally Posted by conceptumator
So far as I can tell, our second AC is not ducted. It simply dumps into the bedroom, straight down on the bed (which is the preferred scenario from my wife at this time in our lives!). When only the rear AC is running, I do feel some very slight airflow through the ducts but I think it's just the pressure equalizing through the coach. If both were ducted and running at the same time, you'd have the airflow from each direction fighting one another inside the ducts.
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Not true sir, you get more air flow!
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
2016 nights camped "10"
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06-07-2016, 01:27 PM
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#14
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
Originally Posted by conceptumator
So far as I can tell, our second AC is not ducted. It simply dumps into the bedroom, straight down on the bed (which is the preferred scenario from my wife at this time in our lives!). When only the rear AC is running, I do feel some very slight airflow through the ducts but I think it's just the pressure equalizing through the coach. If both were ducted and running at the same time, you'd have the airflow from each direction fighting one another inside the ducts.
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Pm sent
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
2016 nights camped "10"
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06-07-2016, 01:38 PM
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#15
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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There is NO difference between a ducted and non ducted a/c unit.
The things that make them ducted or non ducted are :
1) control module
2) ceiling diffuser
3) thermostat
4) cut outs in the atttic
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
2016 nights camped "10"
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06-07-2016, 01:45 PM
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#16
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Phat Phrog Stunt Team
Join Date: Apr 2012
Location: Tipp City, OH
Posts: 7,154
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Quote:
Originally Posted by TURBS
There is NO difference between a ducted and non ducted a/c unit.
The things that make them ducted or non ducted are :
1) control module
2) ceiling diffuser
3) thermostat
4) cut outs in the atttic
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
2016 nights camped "10"
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I concur. If the OP is having trouble with the original unit not cooling the living area, he should open the bottom dump and forget the ducting until things cooled off.
__________________
2016 Georgetown 364TS
2017 Jeep Rubicon Recon toad
Nights Camped 2019 - 17
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06-07-2016, 01:48 PM
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#17
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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I believe his divider plate may have came loose such as mine did.
When this happens you get no air flow in the vents.
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
2016 nights camped "10"
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06-12-2016, 05:42 PM
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#18
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Senior Member
Join Date: Oct 2014
Location: West Michigan
Posts: 150
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Quote:
Originally Posted by TURBS
Not true sir, you get more air flow!
2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
2016 nights camped "10"
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Turbs is correct. I have two units and airflow increases when both units are on.
Computer Nerd
2014 Chevy Silverado 3500 HD Duramax
2016 Sandpiper 35ROK
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06-15-2016, 04:14 PM
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#19
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Senior Member
Join Date: Apr 2011
Location: Splendora, Texas
Posts: 1,314
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My current fiver, 2015 Wildcat 327 ck, has two ducked ACs. They
both put the cool air into the same duck and it is very nice. When I had a stand
alone 2nd AC in the bedroom of my last fiver, it was noisy and very hard to control.
It is on or off. You could turn it up or down. After having that I new that only the two ducked units was the way to go in SE Texas. Good Luck
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