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08-28-2016, 05:53 PM
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#1
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Senior Member
Join Date: Jul 2016
Location: Spokane
Posts: 119
Washington
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Furnace and rooftop AC unit running concurrently?
This morning I turned on the furnace from the wall thermostat for the first time. The furnace seemed to be blowing warm air out of all the places I expected, but the roof AC unit in the main room also turned on and was blowing air. I didn't leave it all running to determine if the roof unit was also blowing warm air, but I was surprised to see that running concurrent with the furnace.
Also, since the furnace is LP, why would the roof AC unit run as well? It's electric. I wouldn't think the generator would want to be on to heat the place (???)
An additional data point FWIW: we were on 50A shore power.
Is this normal?
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08-28-2016, 07:49 PM
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#2
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Senior Member
Join Date: May 2013
Location: Cody
Posts: 1,764
Wyoming
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Check the FAN setting on your thermostat... make sure it's in AUTO.
If it's in Low, Med, or High... the fans in your AC units will run with the furnace on
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Tom
2013 VOLTAGE 3200 (EPIC I & II)
2014 Ford F-450 PLATINUM
2018 BMW R1200GS RALLYE
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08-28-2016, 09:12 PM
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#3
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Senior Member
Join Date: Jul 2016
Location: Spokane
Posts: 119
Washington
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Quote:
Originally Posted by ATCguy
Check the FAN setting on your thermostat... make sure it's in AUTO.
If it's in Low, Med, or High... the fans in your AC units will run with the furnace on
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BINGO! That was it. Thanks!
Now, if you can tell me WHY it works that way, I'd be that much better educated....or mystified!
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08-29-2016, 04:18 AM
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#4
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Senior Member
Join Date: Jul 2013
Location: kamloops
Posts: 2,152
British Columbia
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Quote:
Originally Posted by The Cramblersons
BINGO! That was it. Thanks!
Now, if you can tell me WHY it works that way, I'd be that much better educated....or mystified!
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Don't try to reason what goes on in a campers electric/tronics, it'll "drive you around the bend, to drink, crazy."
Just put everything on Auto and let it do what it does.
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Jim
When I was a kid I was going nowhere fast, now I'm an old man I'm going everywhere slow.
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08-29-2016, 09:20 AM
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#5
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Senior Member
Join Date: Sep 2014
Location: Callaway
Posts: 864
Maryland
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Having the fan run while the furnace is on is a good tool to keep in your hip pocket....remember, heat rises. In the winter, we will run the main unit on low to help even out the heat, especially in the garage. It is not hot air like the furnace, but it is much warmer than nothing...we don't do it all the time, especially if the roof unit is covered in snow, but we will up until then.
Cale
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TV: 2015 F-350 DRW, CC, 4x4, with 14k GVWR package, 98 gallon TransferFlow Aux Tank, Timbren Shocks
TH: 2014 Voltage 3950, Sailun S637 all around
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08-29-2016, 03:04 PM
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#6
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Senior Member
Join Date: Jul 2013
Location: kamloops
Posts: 2,152
British Columbia
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Quote:
Originally Posted by calewjohnson
Having the fan run while the furnace is on is a good tool to keep in your hip pocket....remember, heat rises. In the winter, we will run the main unit on low to help even out the heat, especially in the garage. It is not hot air like the furnace, but it is much warmer than nothing...we don't do it all the time, especially if the roof unit is covered in snow, but we will up until then.
Cale
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Cale,
Good point. We run our furnace in the stick house year round, it evens the temperature spikes out and the furnace cycles less.
I've often thought about looking for a two-speed 12V motor for the furnace, but you got me to thinking about it. I can see a seperate motor for the cold air return in the near future, just in time for the fall trips that are coming up.
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Jim
When I was a kid I was going nowhere fast, now I'm an old man I'm going everywhere slow.
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08-29-2016, 03:48 PM
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#7
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Site Team
Join Date: Jun 2014
Location: Sprung Leak
Posts: 3,157
North Carolina
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What brand of thermostat is it? I have a Dometic on a Coachmen and mine isn't wired that way.
Aaron
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There is madness to my methods
2015 Coleman CM16FBS(traded) 2016 Concord 300DS
2015 Ford Fusion Hybrid following along
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09-06-2016, 11:16 PM
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#8
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Senior Member
Join Date: Nov 2015
Location: Ft. Pierce
Posts: 312
Florida
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Quote:
Originally Posted by wahoonc
What brand of thermostat is it? I have a Dometic on a Coachmen and mine isn't wired that way.
Aaron
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I have a Dometic thermostat on a 2016 Denali and it works that way.
As mentioned above, that is useful when running the furnace.
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09-07-2016, 01:39 AM
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#9
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Member
Join Date: May 2016
Location: Pioneer
Posts: 41
California
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Quote:
Originally Posted by Handyman
I have a Dometic thermostat on a 2016 Denali and it works that way.
As mentioned above, that is useful when running the furnace.
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Albeit noisey!
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'01 Dodge 3500 dually
2016 V3805
1987 Chenowth desert buggy
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09-07-2016, 05:58 PM
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#10
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Senior Member
Join Date: Dec 2011
Location: Helena, MT
Posts: 606
Montana
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I believe it is also associated with heat pumps that can be added to rooftop air conditioners. I don't have one so I don't know, but I've heard about them.
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2012 Aspen Trail 2710BH | 470 watts of solar on the roof | 2x6V GC batteries | 1500 watt PSW inverter | Micro Air on A/C | so far strictly boondocking
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