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10-15-2017, 07:40 PM
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#1
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Montana Master
Join Date: Apr 2016
Location: North Lake Tahoe
Posts: 639
M.O.C. #18510
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Heater and A/C on at the same time?
I'm sorry if this is a repost, but we have been staying in Bend, Oregon, and it has been 25 degree nights, so the fireplace and a small room heater are not keeping up, so we have been using the furnace, and it is weird, that even though it is blowing warm air in from the floor ducts, the roof A/C ducts are blowing in really cold air? Way is this?
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2017 3820FK Legacy Edition full body paint Montana, For Sale this November, 2018. 2016 Ram 3500 long bed Dually Cummins Turbo with air bags
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10-15-2017, 08:18 PM
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#2
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Montana Master
Join Date: Mar 2015
Location: Gardnerville
Posts: 1,250
M.O.C. #17163
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Quote:
Originally Posted by vipermanden
I'm sorry if this is a repost, but we have been staying in Bend, Oregon, and it has been 25 degree nights, so the fireplace and a small room heater are not keeping up, so we have been using the furnace, and it is weird, that even though it is blowing warm air in from the floor ducts, the roof A/C ducts are blowing in really cold air? Way is this?
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The thermostat has zone 1 and 2... make sure two is off... while zone two is showing go to mode and push mode button so it says off. Then push zone 1 and then mode. Push mode to furnace.. auto should be off as well. Adjust temp to where you want it... if the ac comes on it will take about 30 seconds to shu off.
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10-15-2017, 09:32 PM
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#3
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,323
M.O.C. #4831
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This is a common problem. The fan must be set to Auto when running the furnace. Otherwise the A/C fans will run also. It is documented in the thermostat manual. Do a "Search" and you will find lots of posts on the this. For example:
http://www.montanaowners.com/forums/...ghlight=heater
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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10-15-2017, 10:23 PM
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#4
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Seasoned Camper
Join Date: Mar 2017
Location: Menifee
Posts: 73
M.O.C. #19585
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You can also just trip the A/C cb and it will prevent the A/C fan from running.
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10-15-2017, 10:47 PM
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#5
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Established Member
Join Date: Nov 2016
Location: Westerville
Posts: 47
M.O.C. #19266
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Quote:
Originally Posted by vipermanden
I'm sorry if this is a repost, but we have been staying in Bend, Oregon, and it has been 25 degree nights, so the fireplace and a small room heater are not keeping up, so we have been using the furnace, and it is weird, that even though it is blowing warm air in from the floor ducts, the roof A/C ducts are blowing in really cold air? Way is this?
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Turn on thermostat. Push mode. Once fan mode "High" comes up press the up arrow until "auto" appears. Then push mode till you get to furnace. The key is the fan setting has to be on "Auto" to run furnace otherwise a/c will be on too. This happen to me the first winter. Icicles were forming outside. Thanks to my Dad explaining it to me it would have been a miserable night. Of course his first statement was "I take it you still haven't read your manuals on your camper".
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PEACHES
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10-15-2017, 11:00 PM
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#6
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Montana Master
Join Date: Apr 2016
Location: North Lake Tahoe
Posts: 639
M.O.C. #18510
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Wow, who would have figured that out on their own!! thanks guys, it works! Now it will not be fighting itself!!
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2017 3820FK Legacy Edition full body paint Montana, For Sale this November, 2018. 2016 Ram 3500 long bed Dually Cummins Turbo with air bags
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10-16-2017, 11:21 AM
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#7
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Montana Master
Join Date: Mar 2015
Location: Gardnerville
Posts: 1,250
M.O.C. #17163
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Quote:
Originally Posted by vipermanden
Wow, who would have figured that out on their own!! thanks guys, it works! Now it will not be fighting itself!!
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Glad to help... I had this issue and finally figured it out...
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10-16-2017, 11:27 AM
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#8
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Montana Master
Join Date: Apr 2016
Location: North Lake Tahoe
Posts: 639
M.O.C. #18510
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OK< just to make sure, when I want to just use the A/C on hot days, am I supposed to do the same Auto thing, so it will shut off and on from time to time? Right now, when I put the A/C on, it just stays on, and keeps cycling between the compressor being on and not being on, but the loud noise is constant? So maybe if I try this Auto fan thing, it will shut off as long as it has reached the temp I want, which with these A/C units, might not ever happen, unless it is only 80 degrees out side? :-)
__________________
2017 3820FK Legacy Edition full body paint Montana, For Sale this November, 2018. 2016 Ram 3500 long bed Dually Cummins Turbo with air bags
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10-16-2017, 12:59 PM
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#9
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Established Member
Join Date: Nov 2016
Location: Westerville
Posts: 47
M.O.C. #19266
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Quote:
Originally Posted by vipermanden
OK< just to make sure, when I want to just use the A/C on hot days, am I supposed to do the same Auto thing, so it will shut off and on from time to time? Right now, when I put the A/C on, it just stays on, and keeps cycling between the compressor being on and not being on, but the loud noise is constant? So maybe if I try this Auto fan thing, it will shut off as long as it has reached the temp I want, which with these A/C units, might not ever happen, unless it is only 80 degrees out side? :-)
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Yes use auto for a/c also. Glad to be of help!!!!!
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