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Old 04-14-2014, 02:00 PM   #15
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Thanks Howie:

I'm assuming this unit will have a bypass mode as It's a 2013. That said, I will check for sure. I think in the end, I will just leave the furnace on low and hope for the best. Hell this cold weather cannot last much longer.....lol

Thanks again

Doug



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Originally Posted by HowieE View Post
Just pumping in antifreeze is not a good idea. You should blow down the system from the city connection first. Drain the hot water heater and switch to bypass mode, if equipped. Then remove the input line to the pump and use the pump to fill the system. Failure to do this will leave water in the line from the city connection to the rest of the system. If there is not a bypass valve on the trailer you should consider putting one on before you travel. Failure to do this will require 6 gallons of antifreeze and no guarantee you had done more than just dilute things.

Another consideration.

If the day time temperatures are above freezing while traveling and the nighttime temperature are above 25F you can safely do nothing. It takes more than an overnight to freeze things up at those temperatures.

There is nothing colder than an Airstream trailer if you come out of your truck and step into an unheated trailer. Radiating to cold aluminum is like sitting on dry ice. Use the heater.
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Old 04-14-2014, 02:15 PM   #16
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Turning off LP tank prior to refueling the diesel or gasoline is not necessary period. I have mentioned it in a previous thread that is: any flammable vapor mixed with air (oxidant) are dangerous within Lower Explosion Limit (LEL) and Higher Explosion Limit (HEL). Any mixture above or below these limits e.g. too lean or too rich does not explode or catch fire. Having the right mixture near the Airstream open flame e.g. refrigerator/water heater near the gas pump is very remote to none. I have been RV'ing for last 6 years and never turned off the propane ever when driving or re-fueling. When it comes to safety I never compromise. This is an opinion of a Chemical Engineer, who has been wrong many times.
Happy camping
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Old 04-14-2014, 02:40 PM   #17
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Quote:
Originally Posted by HowieE View Post
Just pumping in antifreeze is not a good idea. You should blow down the system from the city connection first. Drain the hot water heater and switch to bypass mode, if equipped. Then remove the input line to the pump and use the pump to fill the system. Failure to do this will leave water in the line from the city connection to the rest of the system. If there is not a bypass valve on the trailer you should consider putting one on before you travel. Failure to do this will require 6 gallons of antifreeze and no guarantee you had done more than just dilute things.

Another consideration.

If the day time temperatures are above freezing while traveling and the nighttime temperature are above 25F you can safely do nothing. It takes more than an overnight to freeze things up at those temperatures.

There is nothing colder than an Airstream trailer if you come out of your truck and step into an unheated trailer. Radiating to cold aluminum is like sitting on dry ice. Use the heater.
Hi Howie,

I have done it both ways over the years - i.e. blowing first with compressed air, then pumping in the antifreeze or just pumping in the antifreeze to pump out the water. Never had a problem with either method, and it does get pretty cold up this way!

As for the incoming city water line, you make a good point and no doubt your method is the surest.

In our case, ours has an external tap right near the city water inlet - I do always crack that open until it runs pink. I guess that is why I have never had a problem with it when I have not first blown the lines with air. I also crack the two low point drains open momentarily.

To the original poster

To make the job of filling the plumbing lines with antifreeze as easy as possible, you need bypass valves on your HW tank allowing you to take the HW tank out of the system and just drain the water out of it leaving it empty.

To get the antifreeze into the system, the easiest way is to have a short suction hose on your 12v pump inlet. You disconnect the pump suction from the fresh water tank, then use the short suction hose to suck antifreeze directly from the one gallon jugs into the plumbing system.

Once ready to start the process, you then go around opening ALL hot and cold taps one at a time letting them run until they run pink showing that the antifreeze is escaping. Don't forget the galley sink rinse hose, shower, and toilet rinse hose if there is one.

Normally takes about a gallon on a half when I do this with our Classic 30.

I dump the remainder into the sink traps, shower drain and toilet bowl to ensure they are protected and to keep the seal in the toilet soft and working.

The whole process takes me probably twenty minutes.

It is possible that your trailer might need to have an HW tank bypass installed, and also a means to allow your 12v pump to draw from the jugs of antifreeze.

Any RV shop should be able to attend to these items for you if needed.

Brian.
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Old 04-14-2014, 02:53 PM   #18
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Quote:
Originally Posted by Zia View Post
Turning off LP tank prior to refueling the diesel or gasoline is not necessary period. I have mentioned it in a previous thread that is: any flammable vapor mixed with air (oxidant) are dangerous within Lower Explosion Limit (LEL) and Higher Explosion Limit (HEL). Any mixture above or below these limits e.g. too lean or too rich does not explode or catch fire. Having the right mixture near the Airstream open flame e.g. refrigerator/water heater near the gas pump is very remote to none. I have been RV'ing for last 6 years and never turned off the propane ever when driving or re-fueling. When it comes to safety I never compromise. This is an opinion of a Chemical Engineer, who has been wrong many times.
Happy camping
I agree... however open flame around gasoline is not a wonderful idea. Every now and again someone screws up and dumps a bunch on the ground. I am a Safety Professional and am willing to take an extra step or two to make sure I and others are safe. I came out of a production background and used to take my fair share of less than stellar short cuts to get the job done. Perfect Storms occur just a bit too often to make me totally comfortable with cutting corners much any more.

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Old 04-14-2014, 04:51 PM   #19
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The plan is to overnight in the unit on our way home but I'm concerned about keeping heat in the trailer as I go down the road. Can I leave the furnace on and allow it to heart the trailer. I'm not as concerned about water an the like, just heat.

Hope someone can fill me in on the best way to handle this little trip

TKS
Doug
Hi Doug

Andy (InlandRV)'s advice is correct. You can run the furnace while traveling if you wish. Most Airstreamers and most RVers in general, about 90% as near as I can tell, travel with the propane on if there is a reason to use it while underway. There is extensive data that this is safe and doesn't contribute in any material way to fires. Most trailer fires are electrical in origin. I've posted at length about this elsewhere and won't repeat the details here.

I have traveled with the furnace on myself.

There are a couple of things to keep in mind. The furnace uses a good deal of 12v power and also a good deal of propane while it runs. It will run much of the time if on while traveling due to the cooling effect of the airflow from movement.

Since you do not plan to have shore power at your overnight stops, it will be of vital importance to be sure that the charge line circuit from your tow vehicle is connected properly and is working. For a trip like that I would recommend wiring an ammeter into the charge line so that you can confirm at all times from the cab that the trailer is charging.

You will want to be sure that the batteries are in like new condition. I would replace them if there is any doubt or at least bring fully charged spares.

At the temperatures you're expecting it will take around an hour for the trailer to warm up to the point where you will be comfortable.

You will use as much as 5 gallons of propane a day so plan to stop and refill as necessary.
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Old 04-14-2014, 09:11 PM   #20
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Thanks everyone for the Great input!
Cheers
Doug
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