Thanks, I might print this off. What I'd been doing so far, is to hook up compressed air. Burp out the various faucets. A couple have a WH drain petcock, which gets opened. Burped out. And then, the pump with the pink stuff, pink out all the faucets. Which pink takes care of the traps.
One or two, the WH drains via removing the anode. That's a bit more work, bleed off the pressure, and then gravity drain. I found that removing the anode while the system is still under air pressure, results in me needing to go home for dry clothes. Lot of sediment particles in the WH, also.
I've not found a bypass valve behind the WH, any of the trailers. Not found a low point drain, either. Must be older trailers?
Christopher A. Young Learn more about Jesus
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If you aren't draining the water heater and are only using 2 gal of AF you aren't doing the job properly. The WH is going to be at least 5gal capacity so without bypassing it will require at least 5gal of AF to fill.
Again you do not need to leave the system completely full of AF either, just ensure that any remaining liquid in the system is AF.
The proper efficient procedure would be:
- Turn off and disconnect the water supply
- Drain the system from the low point drains (open high point faucets to let air in, a gallon or two should come out the drains)
- Drain the water heater (5 gal min should come out)
- Close the faucets and WH drain
- Use compressed air for ~1hr to blow remaining water out the low point drains
- Pump AF into the system until it's flowing from the low point drains (bucket there to catch it)
- Drain from the low point drains into the collection bucket
- Drain the WH into the collection bucket
- Close up the system
- Pour a cup or two of AF into each toilet or drain trap
This should leave only AF remaining in any low points in the system and things properly winterized without leaving everything full of expensive AF. Blowing all the water out first ensured you are diluting the AF as little as possible so it is readily reusable on the next trailer.
The key thing to remember is that you do not have to have everything full of AF to winterize it, you only have to replace any water that can't be readily drained with AF, i.e. any low points in the plumbing. Presuming small water heaters and not many low points in the plumbing you should need perhaps 6-8 gal of AF overall to do all the trailers.