3 way Fridge Disposal - Fiberglass RV


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Old 07-08-2020, 03:39 PM   #1
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3 way Fridge Disposal

Hi,
Has anyone drained the ammonia from a fridge cooling system? I would like to dispose of my dead fridge but local transfer station wants it drained.

Thanks,
Steve
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Old 07-08-2020, 06:31 PM   #2
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My guess is that the "transfer station thinks it has freon in it.
Ask your local RV shop, they may even take it for free to repair it or use it for parts.
Or at least they may drain the ammonia if you don't want to do it or are not sure how.
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Old 07-08-2020, 06:42 PM   #3
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I agree that someone will likely want it. But "draining" it is an interesting question. I looked around the net and found no direct answers. However there was this story from someone who had a number of absorption fridges he needed to dispose of...
Yellowjackets line piercing tool will only work on copper lines but not on steel lines so I made a saddle, nipple welded on, attached ball valve and a fitting for a hose. I open the valve, put a drill through it and tap the line. I withdraw the bit enough to close the gate valve. I lose some ammonia but I am wearing a full face cover and and gas mask. I did 40 or fridges and then had one flare on me... 8 feet straight out; lasted only a second. That got my attention. I did a couple more and then when I tapped a small fridge and the ammonia came out, it exploded. No harm done but it puts this procedure on hold.
So I a thinking a large open field and a high powered rifle.
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Old 07-08-2020, 08:37 PM   #4
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Okay, thanks for that info. I looked on the web but could not find anything. The fact that it can explode out is not something I want to experience.

I also wonder if any pressure in the system is gone since the ammonia was leaking. It was bad enough with the door closed. That is the reason I removed it because I wanted use the trailer and was getting it ready for a trip when it started to leak and smell. Had to wear a respirator while getting it out.

I was thinking of using a drill but that sounds risky now.

Thanks
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Old 07-09-2020, 02:43 AM   #5
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The reason I won't drive down the road with my fridge on gas is not because of the propane but rather that hydrogen gas is one of the components in the refrigerant. Perhaps that's what's exploding?
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Old 07-09-2020, 05:06 AM   #6
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Post it for free on Craigslist or Marketplace. Someone somewhere will always want it for whatever reason. Put it on the curb with a sign that says free and post it online. State that they don't need to come to the door just take it. Always works for me and if someone can use it better than being put in a landfill.
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Old 07-10-2020, 03:34 PM   #7
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I too my old Dometic fridge to a local scrap yard. They took it, no questions asked.
I don't think Ammonia is toxic.
What's that about hydrogen? You better look up how absorption fridges work.
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Old 07-10-2020, 04:30 PM   #8
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Quote:
Originally Posted by Wayne Collins View Post
I too my old Dometic fridge to a local scrap yard. They took it, no questions asked.
I don't think Ammonia is toxic.
What's that about hydrogen? You better look up how absorption fridges work.
I already have.

https://en.m.wikipedia.org/wiki/Absorption_refrigerator



Excerpt: The refrigerator uses three substances: ammonia, hydrogen gas, and water. The cycle is closed, with all hydrogen, water and ammonia collected and endlessly reused. The system is pressurized to the pressure where the boiling point of ammonia is higher than the temperature of the condenser coil (the coil which transfers heat to the air outside the refrigerator, by being hotter than the outside air.) This pressure is typically 1416 atm at which pressure the dew point of ammonia will be about 35 C (95 F).
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Old 07-10-2020, 09:50 PM   #9
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Quote:
Originally Posted by Raz View Post
I already have.

https://en.m.wikipedia.org/wiki/Absorption_refrigerator



Excerpt: The refrigerator uses three substances: ammonia, hydrogen gas, and water. This pressure is typically 14–16 atm at which pressure the dew point of ammonia will be about 35 C (95 F).
That's 235 psi for the curious folks. Typical scuba tank pressure is 3000 psi.
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Old 07-18-2020, 11:40 AM   #10
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Be careful with the fridge. I accidentally punctured a line when I was removing the fridge and it was not pretty. Besides an oily mess where the compressed gas escaped, I got some on my face and received burns from the ammonia.
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Old 07-18-2020, 02:09 PM   #11
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Why are you disposing of it? Usually the reason it doesn't work is that the amonia has escaped.
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