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Old 11-05-2012, 08:17 AM   #1
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Fresh water winterizing: "air pressure" vs "antifreeze"

This is our first year winterizing our 22FB. In the owners manual it explains that there are 2 methods available. One may either choose to blow out and evacuate the fresh water lines using air pressure through the outside city-water inlet port. OR one may use the 12V electric water pump and appropriate use of the bypass valves, etc. I decided to try the air pressure method. In the manual it says that use of the air pressure method "depends" on the model of your trailer. OK. Does that merely mean IF one has the city water inlet port?

So I connected my air compressor to the city-water inlet port (with an adapter AND a pressure regulator to be safe) and blew out the water lines as described in the manual. I did not add any antifreeze to the water lines. (I did add, of course, antifreeze to the p-traps & toilet.) In addition we also never used the 12V water pump during the camping season, so there was never any water introduced into the water pump itself. Can anyone else who has used the air pressure method tell me if there's anything else I need to attend to with this method? Or by some chance is the air blowout method not advised in some instances that may not be obvious? It certainly seemed easy enough and, being the first time doing this winterizing with this trailer, that's what concerns me. Just want to be sure.
Comments appreciated.

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Old 11-05-2012, 09:09 AM   #2
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Don't forget your outside shower if you have one. This is the one thing that first time winterizers forget. Don't set your regulator to anymore than 35 PSI.

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Old 11-05-2012, 09:12 AM   #3
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Not sure if you have them or not, but low point drains.

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Old 11-05-2012, 09:54 AM   #4
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Another check you can make while the system is pressurized is to separately open each valve on every faucet. Obviously, you should be getting air and not water. As mentioned above, the outside shower and low-point drains shouldn't be forgotten.

I have always used a shop vac to blow out the water lines and drains on my TTs, and have never had a problem with excess pressure or freezing.
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Old 11-05-2012, 10:45 AM   #5
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Good comments & suggestions. Thank you. I think I've attended to EVERY possible freshwater line/port in the trailer. (all LPD's, inside & outside shower, galley, head, hot tub, etc ...) I think I'm good to go. I also think I may want to revisit my HWH. I find that whenever I drain the HWH, after a trip, I encounter some leftover residual water still sloshing around inside the bottom of that tank. By gently rocking the trailer back and forth just a bit some of that extra water will spurt out. So I may just go back in there now with a curved plastic tube of some sort and see if I can also drain out any remaining water (if there is any) with a small utility pump. The HWH drain plug must not be actually located at the lowest point in the tank. But maybe I'm just being overly cautious.
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Old 11-05-2012, 11:47 AM   #6
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Originally Posted by Steamboat_Willie View Post
I find that whenever I drain the HWH, after a trip, I encounter some leftover residual water still sloshing around inside the bottom of that tank.
Get one of the WH flush wands (a smaller version of the black tank wand) and hook it up to your compressed air source using the blow-out adapter. You'll be able to blow out almost all of the water. I read in the HW manual that after draining via the plug and remaining water will not be a factor. Since it's just a cup or so in the bottom there's plenty of expansion room should it freeze.

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Old 11-05-2012, 01:41 PM   #7
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We use the 12VDC tankless air compressor and water inlet adapter. This is also great to always have available where ever you go in case you end up camping over night somewere where it freezes at night. My trailer just takes a coupe of minutes to blow out the lines and if the temp comes back the next morning I just go head and start using things all over again.

Dont have to worry about the pink stuff in the lines.

A great PLAN-B thing to have aboard for those unexpected freeze times.

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Old 11-05-2012, 06:15 PM   #8
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If you have a black tank flush system you will need to blow that out too.
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Old 11-05-2012, 06:22 PM   #9
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Don't worry about the cold water heater. A little bit of water in it will not hurt anything if it freezes.
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Old 11-06-2012, 06:32 PM   #10
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I use the pink stuff because I like the visual confirmation that flows from each water source. I'd appreciate feedback from all the air fans as to what you don't like about the anti-freeze method.

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