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08-26-2016, 02:02 AM
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#1
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Montana Fan
Join Date: Jan 2013
Location: Jefferson,
Posts: 264
M.O.C. #13170
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A/C stopping and starting
Our ac runs for a fairly long time, then stops. About 30 seconds later, it starts up again. It's blowing cold air but it should run continuously until the temp. satisfies the thermostat setting. This just started a few days ago with temps. in the low 80s. Do any of you have any idea what may be causing this? We have always run the unit with the fan on auto.
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08-26-2016, 02:38 AM
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#2
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Montana Master
Join Date: Feb 2003
Location: Englewood
Posts: 3,095
M.O.C. #164
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What I beleive you are hearing is the Fan Automatically shifting from Low to High or High to Low speed.
I can not remember exactly but the info is in the Dometic Manual
When the room temp is 4 degrees or so above thermostat setting fan will run on high as it gets closer to stat temp the fan will stop as you discribe and shift to low fan speed
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08-26-2016, 04:05 AM
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#3
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Montana Master
Join Date: Feb 2003
Location: Englewood
Posts: 3,095
M.O.C. #164
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[quote]Originally posted by kdeiss
What I beleive you are hearing is the Fan Automatically shifting from Low to High or High to Low speed.
I can not remember exactly but the info is in the Dometic Manual
When the room temp is 4 degrees or so above thermostat setting fan will run on high as it gets closer to stat temp the fan will stop as you discribe and shift to low fan speed
Per Dometic Stat Directions: In Auto the Fan operates on High when room temperature is 5 Degrees higher then Stat setting and low when room temp is 4 degrees higher!
Hope this helps
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08-26-2016, 04:41 AM
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#4
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Montana Fan
Join Date: Jan 2013
Location: Jefferson,
Posts: 264
M.O.C. #13170
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Ken, Thank you for the reply, but I can clearly hear the compressor stop, then the fan. Then I hear the fan restart, then the compressor kick in again. I'm beginning to think maybe an issue with the thermastat.
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08-26-2016, 05:46 AM
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#5
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Montana Fan
Join Date: May 2016
Location: Massillon
Posts: 437
M.O.C. #18658
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In my unit the system goes to a complete shut down when changing fan speeds and it takes almost 2 minutes for both the compressor and fan to come back on. It does exactly the same cycle as you described. If you had a power outage or turned it off and on with the circuit breaker it has the same quiet time before the fan and then the compressor come on. In my old MH the system did the same shutdown with the fan speed change.
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08-26-2016, 10:10 AM
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#6
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Montana Master
Join Date: Feb 2003
Location: Englewood
Posts: 3,095
M.O.C. #164
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Quote:
quote:Originally posted by jameswbarton
In my unit the system goes to a complete shut down when changing fan speeds and it takes almost 2 minutes for both the compressor and fan to come back on. It does exactly the same cycle as you described. If you had a power outage or turned it off and on with the circuit breaker it has the same quiet time before the fan and then the compressor come on. In my old MH the system did the same shutdown with the fan speed change.
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I agree with James compressor shuts down when Auto Fan changes speed!
Hot here today I am running on High Fan!
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08-26-2016, 11:57 AM
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#7
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Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 3,198
M.O.C. #13740
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Getting by with only one ac...now that is impressive! You might try running it in another fan speed to see what happens versus running in auto. Or you may want to pull the thermostat and let it dangle off the wall to see if this changes what you are experiencing now. John
__________________
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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08-27-2016, 09:46 AM
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#8
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Montana Fan
Join Date: Jan 2007
Location:
Posts: 129
M.O.C. #6748
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Just read your post and we had the same concerns with our front ac doing the same thing. I pulled out the thermostat manual and read it about three times before I understood that this was a normal procedure. I don't have the correct answer for you right now but if you read up on it, you will see that the ac will act like that while in the auto fan mode. I will get the technical answer for you soon if nobody else gets it to you first.
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08-27-2016, 11:48 AM
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#9
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Montana Fan
Join Date: Jan 2013
Location: Jefferson,
Posts: 264
M.O.C. #13170
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Thanks a bunch everyone. You have put my mind at ease.
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