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03-29-2014, 04:52 AM
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#1
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Montana Fan
Join Date: Feb 2013
Location: Poughquag
Posts: 127
M.O.C. #13192
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BEDROOM A/C CYCLING
On our 2013 3900FB Montana the bedroom A/C keeps cycling on and off frequently.
This is also at night time. This unit has a remote sensor in the bedroom. When I say frequently I mean it runs for 5 minutes then off for 2 to 3 minutes then back on again. It is very annoying. The front
A/C runs fine. I don't think this is normal. Is there a problem with this unit. Any help would be appreciated.
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03-29-2014, 05:02 AM
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#2
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Montana Master
Join Date: Feb 2007
Location: Winfield
Posts: 7,327
M.O.C. #6846
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Are the vents pointed towards the temperature sensor? It may help to turn them away from the sensor. Just a thought.
Bingo
__________________
Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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03-29-2014, 05:34 AM
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#3
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Montana Master
Join Date: Feb 2005
Location: Osmond
Posts: 673
M.O.C. #3160
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I agree with Bingo, we had the same thing happen to us.
__________________
LARRY & LAVONNE HUMMEL
2018 3811MS
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03-29-2014, 05:36 AM
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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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Once you've got the vents pointed the right way, you may also wish to close the dump and use only the vents. This will make it run longer and also not dump a whale of cold air right on you at first.
__________________
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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03-29-2014, 05:41 AM
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#5
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Montana Master
Join Date: Apr 2013
Location: Arroyo City
Posts: 3,110
M.O.C. #13395
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My sensor is behind the door, if it is 3/4 open it directs cold air to the sensor
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03-29-2014, 01:06 PM
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#6
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Montana Master
Join Date: May 2011
Location: Fayetteville
Posts: 4,200
M.O.C. #11401
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We run our fan all the time and the cycling is not as noticeable. Also makes constant white noise. We do not run the bedroom AC unless it is very warm out.
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03-29-2014, 03:04 PM
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#7
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Montana Fan
Join Date: Feb 2013
Location: Poughquag
Posts: 127
M.O.C. #13192
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Thanks so far for the replies. But I think my big question is does this sound normal, that it cycles more than the living room A/C compressor. The vents are not pointed at the sensor at all. And I have the big vents on the unit off also. just use the small vents.
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03-29-2014, 05:47 PM
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#8
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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As far as our rig is concerned yes it does sound normal. We have a full size unit in the bedroom and, compared to the living room/dining room/kitchen area, the bedroom is very small and so it meets the need much much faster. For this reason I keep the dump on the bedroom closed, only using the vents in there and let that unit help the other one with the rest of the house. Works for us, but everyone has to work out what works best in their rig.
__________________
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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03-29-2014, 06:29 PM
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#9
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,702
M.O.C. #12947
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You are indicating you have the vents on the front AC closed and are using the small vents. I am assuming you are talking small vents as the two round vents? On our rig, the two small round vents are from the rear living room AC. We did not realize this until the bedroom AC failed last year and we only had the rear AC working. If the temps are not too high, you might get along quite well with just the rear AC running, at least until it really gets hot outside. At night, when it's still uncomfortable, we usually just run the bedroom AC, with the fan control set to ON, not AUTO, so we get the white noise, and don't get the cycling on and off, and the compressor runs as needed. The 13.5 AC is a lot of AC for the small bedroom, so it is going to cycle the compressor frequently.
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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03-30-2014, 03:10 AM
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#10
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Montana Fan
Join Date: Feb 2013
Location: Poughquag
Posts: 127
M.O.C. #13192
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Thanks All. Sounds like my A/C is working normal then. Thanks for the quick replies. I'll also try leaving the fan on and see how that works out.
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03-30-2014, 03:28 AM
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#11
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Montana Master
Join Date: May 2011
Location: Fayetteville
Posts: 4,200
M.O.C. #11401
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When both AC are needed if the dump door on the bedroom AC is closed, it just supplies more volume to all diffusers. The bedroom and living room units force air through the same ductwork. The dump door is for quick cooling such as when you start up on a hot day. We usually turn the bedroom AC off after the house is comfortable, unless it is very warm or humid weather.
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03-30-2014, 04:34 AM
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#12
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,702
M.O.C. #12947
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Larry, maybe your rig is different, but on our 3402, with factory installed front/bedroom AC, it does not connect to the rear AC duct work. I know there are all different kinds of systems, but the front unit on ours only discharges air directly from the AC itself, and is controlled from the Dometic thermostat as system #2. I think it would be difficult to properly control these units if they were pushing air into a common duct system, and also, the front unit has its temperature sensor on the ceiling of the bedroom, away from the main thermostat.
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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