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Old 10-09-2014, 08:14 PM   #43
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So any recommendations as to a quality unit for the task?


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Old 10-09-2014, 08:19 PM   #44
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Quote:
Originally Posted by Inland RV Center, In View Post
A small air compressor cannot possibly provide enough air to correctly blow out the water lines.

Normally, a minimum of a 5 HP compressor is necessary to do the task correctly.

Andy
I use a 120vAC compressor rather than a 12v model, with a 1½-gallon air tank. Pressurize the tank to 125psi, with the air output from the tank regulated to about 45psi, and it does just fine for blowing out the lines. And the compressor isn't anywhere near 5hp, more like ¾hp. The whole compressor, tank included, is only about the size of a five-gallon bucket.
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Old 10-10-2014, 05:53 AM   #45
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The reports I've heard are that when the backflow preventer breaks you are tipped off by the flood occurring in the bathroom when you try to back flush.


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Old 10-10-2014, 07:56 AM   #46
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I use a 120vAC compressor rather than a 12v model, with a 1½-gallon air tank. Pressurize the tank to 125psi, with the air output from the tank regulated to about 45psi, and it does just fine for blowing out the lines. And the compressor isn't anywhere near 5hp, more like ¾hp. The whole compressor, tank included, is only about the size of a five-gallon bucket.
I have a Sears model, cost about $100 6 or 7 years ago. It has a 3 gallon tank and a 1 HP pump. I think it weighs about 40 lbs. It did a great job yesterday. I was very pleased.

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Old 10-10-2014, 08:39 AM   #47
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I have a smaller sears 120v model that I carry with me. I haven't used it to winterize so I'm not sure if it's up to it. I did use it to pump my trailer tires back up to 80psi awhile ago and it tooooook forever. It does put out 100+psi but the volume is very small. In a pinch it did work for the tires but not as well as I hoped. The one Rich shows looks to be much better. For winterization I have a stationary large one to use.
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Old 10-10-2014, 10:13 AM   #48
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I have a smaller sears 120v model that I carry with me. I haven't used it to winterize so I'm not sure if it's up to it. I did use it to pump my trailer tires back up to 80psi awhile ago and it tooooook forever. It does put out 100+psi but the volume is very small. In a pinch it did work for the tires but not as well as I hoped. The one Rich shows looks to be much better. For winterization I have a stationary large one to use.
DO NOT set the pressure.

The pressure regulator in the trailer, does that for both water and air.

Andy
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Old 10-11-2014, 10:11 AM   #49
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DO NOT set the pressure.

The pressure regulator in the trailer, does that for both water and air.

Andy
I think on this particular model you have to set it to something. There are two gauges on it, tank pressure and regulated pressure. I have the regulated pressure set for 100 psi but it doesn't go much higher. If you set it for anything less it becomes difficult to air up 50 lb psi tires because the tank pressure drops so fast. To blow out the lines I let tank pressure build to 100 psi, start blowing out the lines and it drops pretty fast but there's enough pressure to do a sink at a time. The pump kicks in at about 70 and I let it run until it drops to about 30. Then I stop until it goes back to 100 and do the same sink a second time. That takes care of it. After all the lines are clear I pump the pink stuff in. My AS has a separate inlet where I can put a tube into a gallon and let the pump draw it in.
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Old 10-11-2014, 10:30 AM   #50
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DO NOT set the pressure.

The pressure regulator in the trailer, does that for both water and air.

Andy
Andy, could you be more specific? In most air purge winterization instructions I've read, they suggest setting the pressure on the output side of your compressor to 50 psi or less to protect the PEX water lines. My tank pressure is regulated at 120 psi. If I set the output pressure to 50 psi, the compressor is able to maintain the 50 psi output.
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Old 10-11-2014, 10:43 AM   #51
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Andy, could you be more specific? In most air purge winterization instructions I've read, they suggest setting the pressure on the output side of your compressor to 50 psi or less to protect the PEX water lines. My tank pressure is regulated at 120 psi. If I set the output pressure to 50 psi, the compressor is able to maintain the 50 psi output.
The water pressure regulator also regulates the air pressure.

So if you have 100 psi as an example, the regulator will cut it down to it's setting.

Andy
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Old 10-11-2014, 11:23 AM   #52
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Great to know Andy, thanks.
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Old 10-20-2014, 10:23 AM   #53
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I tried blowing out the black tank flush system the other day. I don't think much (or any) air got to the flush mechanism due to the plastic pop-up valve on that water line's inlet. Is this the black water backup protector or check valve that some have mentioned?

I did manage, with some difficulty, to get a little antifreeze down the line by pushing the valve in with my finger and using a spray bottle.
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Old 10-20-2014, 03:36 PM   #54
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A little bump.

No one else has encountered this difficulty?
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Old 10-20-2014, 03:50 PM   #55
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I have always pumped antifreeze through the plumbing without blowing the lines first. I never thought about putting antifreeze into the black tank sprayer?? I wonder if I just got lucky since I haven't had it freeze or break?


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Old 10-20-2014, 04:18 PM   #56
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I have always pumped antifreeze through the plumbing without blowing the lines first. I never thought about putting antifreeze into the black tank sprayer?? I wonder if I just got lucky since I haven't had it freeze or break?


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Earlier in the thread some have said it is advisable to blow it/antifreeze it. The reality I found for that particular line? Kinda difficult due to the backup valve at the inlet.
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