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09-03-2018, 07:31 AM
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#1
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Established Member
Join Date: Sep 2018
Location: Hopkins
Posts: 12
M.O.C. #22553
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Both AC at same time
Hello,
We have a thermostat in the front and in the living area on our 2019 20th anniversary addition 3721rl
I want the rear to run with the front one or just the rear.
It gets way to hot in the living area
i have a messed up way to get it to work
the front one will be running and i go to the rear thermostat turn on the (heat pump) ir the furnace let it run for 10 seconds then turn it to cool and they will both run all day keeping it nice inside.
There has to be a way to be in-control of this system!
What am i missing, i just want them both to run!
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09-03-2018, 09:49 AM
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#2
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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I hope I understood what you are trying to do. Do you have both fans set to high? That will move the air around. I would then set the rear one lower than the front and put a small fan in the front to move air from the front toward the rear. We had the opposite problem, but that's what we did until we got the third AC installed.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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09-03-2018, 09:59 AM
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#3
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Odd. Ours will both run at the same time anytime. Doesn't matter what fan setting and can both be set to same temperature and we can run either by itself if wanted that way.
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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09-03-2018, 10:04 AM
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#4
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Established Member
Join Date: Sep 2018
Location: Hopkins
Posts: 12
M.O.C. #22553
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Thank you
But how do I get them both to run?
I just want to walk up and have them both turn on,
Thanks
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09-03-2018, 10:06 AM
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#5
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Established Member
Join Date: Sep 2018
Location: Hopkins
Posts: 12
M.O.C. #22553
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Quote:
Originally Posted by WeBeFulltime
Odd. Ours will both run at the same time anytime. Doesn't matter what fan setting and can both be set to same temperature and we can run either by itself if wanted that way.
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Are yours ( whisper system ?)
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09-03-2018, 10:13 AM
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#6
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Quote:
Originally Posted by 3721RL
Are yours ( whisper system ?)
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Yes they are. 2018.5 3791RD built 09/17 purchased 10/17.
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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09-03-2018, 10:16 AM
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#7
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 4,084
M.O.C. #20477
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Quote:
Originally Posted by 3721RL
Thank you
But how do I get them both to run?
I just want to walk up and have them both turn on,
Thanks
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If your question is how can you set it up so both can be controlled by a single thermostat, they can't as they are separate systems. Each must be set up independently.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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09-03-2018, 10:22 AM
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#8
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Established Member
Join Date: Sep 2018
Location: Hopkins
Posts: 12
M.O.C. #22553
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Quote:
Originally Posted by AZ Traveler
If your question is how can you set it up so both can be controlled by a single thermostat, they can't as they are separate systems. Each must be set up independently.
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I’m a confusing person
Ok
What I want to do is walk in a hot camper walk up to one Thermostat turn it on and have it start
Then walk to the other thermostat Turn it on and have it blow Also
To cool it down ,
No matter what I set the living area too it won’t start unless I start the heat then back to cool then it will run all day if I set it to 55
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09-03-2018, 10:23 AM
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#9
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Quote:
Originally Posted by AZ Traveler
If your question is how can you set it up so both can be controlled by a single thermostat, they can't as they are separate systems. Each must be set up independently.
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This is absolutely correct. The 2 units aren't connected in ANY way other than the duct work.
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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09-03-2018, 10:28 AM
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#10
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 4,084
M.O.C. #20477
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Quote:
Originally Posted by 3721RL
I’m a confusing person
Ok
What I want to do is walk in a hot camper walk up to one Thermostat turn it on and have it start
Then walk to the other thermostat Turn it on and have it blow Also
To cool it down ,
No matter what I set the living area too it won’t start unless I start the heat then back to cool then it will run all day if I set it to 55
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There is no reason you should need to run the heat before the air conditioning, I have not seen that issue before and can't recommend a simple fix.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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09-03-2018, 11:45 AM
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#11
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Established Member
Join Date: Sep 2018
Location: Hopkins
Posts: 12
M.O.C. #22553
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Thank you
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09-03-2018, 12:40 PM
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#12
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Montana Master
Join Date: May 2018
Location: livingston,tx
Posts: 569
M.O.C. #21685
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The dometic thermostats are very sensitive, we set the heat at 60 degrees and the a/c at 70 degrees and have less issues when running the a/c . Sometimes we have to let the fan run first and then switch it to auto a/c, running both at the same time.
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09-03-2018, 01:23 PM
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#13
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Established Member
Join Date: Sep 2018
Location: Hopkins
Posts: 12
M.O.C. #22553
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You saved me
It was my fault I had the heat set at 85 because the dealer during the walk threw wanted to show me the heat pump on the back unit
So it was confused ( do I want it at 89 or 55 because it can do both
The front unit only can cool so it would always cool
Thanks you!!!
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09-03-2018, 08:32 PM
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#14
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Montana Master
Join Date: May 2018
Location: livingston,tx
Posts: 569
M.O.C. #21685
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We set both thermostats at 60 degrees for heat, and both at 70 degrees for a/c, and run both at the same time for a/c, today was 104 degrees outside and 77 degrees inside, that's a 27 degree difference in ambient temperature, we are happy campers with those results, although we start cooling early in the morning to get those kind of results and run the ceiling fan on high.
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09-03-2018, 09:14 PM
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#15
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Established Member
Join Date: Sep 2018
Location: Hopkins
Posts: 12
M.O.C. #22553
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Thank you!
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09-03-2018, 09:56 PM
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#16
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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I keep the heat pump and furnace set low in the summer and the AC set high in the winter to avoid having a brush by turn on.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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09-04-2018, 05:59 AM
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#17
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Montana Fan
Join Date: Jul 2017
Location: Where ever we park
Posts: 213
M.O.C. #20273
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I can run both of mine at the same time with no issues, I can run just the living room one or just the bedroom one. I have the rear ac set lower then the bedroom ac. I have both set to auto and they ran all weekend with no issues
__________________
Mike
2016 Chevy CC DRW Duramax
2019 Montana 3700LK
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09-04-2018, 06:01 AM
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#18
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Established Member
Join Date: Oct 2017
Location: Orlando
Posts: 19
M.O.C. #20752
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We're in Florida and it was a hot summer. My DH realized that when the bedroom AC was on, the AC in the living room area blew twice as hard. So I started turning the bedroom AC to high fan and 70 degrees, then the living area to high fan and 70. It makes the coach freezing! We were running around 76 in the heat of the afternoon before, now it's keeping it at 70. I put everything on auto in the afternoons and it continues to keep it 70 at all times. Sometimes it gets so cold we have to set it to 75 to warm up. Either way, running them both on high fan AC really works!
__________________
SA Smith
Author & Full Time RVer
2018 Montana 3721rl
2017 Ram 3500 dually
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09-06-2018, 05:10 PM
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#19
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Montana Master
Join Date: Dec 2017
Location: Chattanooga
Posts: 681
M.O.C. #20906
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Our 2019 3121 AC units can be set independently.
__________________
2019 Montana 3121RL
2017 XLT 350 SCLB DRW 4X4
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09-09-2018, 02:13 PM
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#20
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Montana Master
Join Date: Mar 2015
Location: Gardnerville
Posts: 1,281
M.O.C. #17163
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Our 15 has a single thermostat. Sometimes the heat runs with the ac.. I figured it out..
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