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Old 02-03-2020, 06:27 PM   #1
Army Paladin
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Question Furnace on while driving

I am sure that this has been asked but could not find it. I wanted to ask if there are issues with running the furnace while you are traveling down the highway? We have been traveling a lot more in the cold weather and did not want the water lines or tanks to freeze up.
Thanks for your help.
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Old 02-03-2020, 06:32 PM   #2
chuckster57
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Some do it, some dont. I’m in the don’t do it club but it doesn’t get that cold out here.

My concern would be depending on the location of the intake/exhaust on the exterior, you may develop a “vortex” and cause the flame to go out. 3 tries and it’s not going to try anymore. If your driving a long distance that may mean it just like not operating it.

I’ll let those that have done it explain it further.
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Old 02-03-2020, 07:01 PM   #3
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I’ve done this before with my fifth wheel. Was towing back from Vegas to Idaho 1st week in Dec. I winterized the fifth wheel in Vegas day before heading back so I was not worried about plumbing freezing n

However the wife had been given many house plants to bring back and there was no room in our club cab truck for them. We put them inside fifth wheel and when we got about 100 miles out of a Vegas headed toward Ely, NV I pulled over and fired up the furnace.

I knew temps up toward a Ely and back in Idaho were about 10 degrees. Furnace was only hope to prevent house plants fr9m freezing.

No issues with furnace while in motion. During fuel stops I DID turn furnace off while refueling and after pulling clear of fuel pumps fired furnace back up..

We were also towing in 25 to 35 mph winds during this return trip to Idaho.. I had set temp at 62 degrees so this worked well for us.. without the furnace running I have no doubt the plants would have all froze

I wasn’t concerned if furnace flame was blown out resulting in propane flowing because the dual solenoids would have closed once no flame was detected..
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Old 02-03-2020, 07:22 PM   #4
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There you go. I know propane would quit flowing in the event the flame blew out or failed to ignite. My comment was after 3 tries to relight it would be in lockout mode and not even try anymore until the thermostat was turned off.
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Old 02-03-2020, 07:35 PM   #5
travelin texans
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Have done so numerous times while traveling in cold temps.
Some will say ABSOLUTELY DO NOT do so, those also will not run fridge on gas while traveling, have done both for over 40 years of rving with 10+ years full-time & never an issue running either during travel.
Was also not an issue fueling, towed with a diesel so if fueling while connected always used truck lanes putting any LP fired appliances 20-25' from the pumps.
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Old 02-03-2020, 09:12 PM   #6
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Have done in cold weather so unit was preheated on arrival.
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Old 02-04-2020, 10:09 AM   #7
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One of the vents in my Alpine is coconut the slide. I’d be skeptical because of that in my case.
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Old 02-04-2020, 10:55 AM   #8
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We have been in subfreezing weather several times and do run the furnace while moving, and this does keep the plumbing from freezing. Another issue that would prevent the use of the furnace is the location of the floor registers, where the heated air comes out. If they are not clear of the slides, you probably should not run the furnace, as you need most of them clear for sufficient air flow so the furnace will work.
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Old 02-04-2020, 01:47 PM   #9
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I do this all the time when traveling in colder weather. I install heat vents that can close and close those that are under slide. I my current rig this is not and issue.
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Old 02-05-2020, 02:43 AM   #10
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It's ok, just do it.
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Old 02-07-2020, 02:28 PM   #11
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Our annual trip is MN to AZ in December and going back the end of March. Yes we have the furnace running for the entire trip for 7 years so far.
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Old 02-20-2020, 02:08 PM   #12
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For me, I decided not to. A lot of rigs have exposed tanks, some water lines underneath so furnace running won't do much to stop freezing outside especially while driving.
I think there may be some sort of vortex created, pressure difference inside the rig as well as the exhaust stack that could cause it to go out so it wouldn't be helping. Most modern rigs will stop the gas flow if the flame goes out and the igniter can't restart the flame. Probably not going to find any manufacturer or dealer documents advising they approve it and probably will be proactive advising against it only for legal reasons and not because it's unsafe. I just don't do it. I don't know how many folks have done it, but we don't hear about a rig that went up in flames because they left the furnace on while towing! I can see the flame going out rather than causing an unsafe condition. But with no experience on the matter, all I have is opinion.
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Old 02-26-2020, 08:29 AM   #13
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We keep our built in Olympic 6000 catalatic heater on when traveling. No flame to blow out and no fumes either.
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Old 02-26-2020, 01:09 PM   #14
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I do not run with the heat on. Bedroom vent is completely blocked off when the slide out is in. In the main living area only one vent is completely open. Two others are only about 1/3 open. Afraid the furnace will become unhappy with so much air restriction. If all the vents were open I would have no problems with running with the heat on.
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