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  #1  
Old 06-29-2005, 09:40 PM
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Freon Question -- Ounces and Pounds

Hey, quick question about weights and measures for R-12.

Is a pound of refrigerant equal to 16 ounces? i.e. is a
12oz can equivalent to three quarters of a pound?

Sometimes it's a liquid, and sometimes it's a gas, and I
measuring either one in pounds seems counterintuitive.

Thanks.
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  #2  
Old 06-29-2005, 09:45 PM
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Quote:
Originally Posted by techguy512
Is a pound of refrigerant equal to 16 ounces? i.e. is a
12oz can equivalent to three quarters of a pound?
This is correct.

It doesn't matter if you charge as a liquid or gas. If you add a 12oz can your adding 3/4 of a pound.

PS. charge as a gas.

Danny
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  #3  
Old 06-29-2005, 10:03 PM
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measuring in kgs or slugs would be better. Lbs is kind of a clumsy measurement for mass. It is unfortunate that weight and fluid measures both use onces in the english system. If you notice it says nt wt on the bottle instead of fl ozs. I don't remember if this is so I would suspect an fl oz of distilled water weights 1 oz. If so the system is even more screwed up think I think. If you struggle with mass concepts be sure to study extra hard before taking up this job. It is hard to keep straight.
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  #4  
Old 06-29-2005, 10:16 PM
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Quote:
Originally Posted by dannym
PS. charge as a gas.

Danny


This with cans upsidedown?
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  #5  
Old 06-30-2005, 12:29 AM
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Quote:
Originally Posted by Hit Man X
This with cans upsidedown?

NO, keep the can right side up on a normal recharge can. You don't want any liquid in your low side line to the compressor.
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  #6  
Old 06-30-2005, 12:35 AM
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WHOA... this is important because accidentally putting liquid into the suction side WILL BREAK THE REED VALVES...

If you use the very handy side tappers and have it at the bottom then you need to have the can upside down...

You have to take the refrigerant out of the HIGH part of the can.....
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  #7  
Old 06-30-2005, 03:33 AM
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freeze 12

r12 is 100 bucks to install and 100 bucks a pound go to ebay and
buy yourself some freeze 12 and just ad it to your r12 there compatable.
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  #8  
Old 06-30-2005, 09:16 AM
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Blue that is like yelling fire in a crowded building. Never add freeze 12 to a system with r-12. All you get is contaminated r-12. It is an acceptable but not preferred replacement. R-12 is about 25-30 a lb on ebay and 15 dollars to get your license....

Leathermang. I got a side tapper. How do you suggest to use it with 12 and 14 oz cases or r-12.

On evaporating the fluid. As long as you don't hang the can like an IV and take reasonable precautions you should have no problem getting vapor only. I think most taps have an atomizer anyway....
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  #9  
Old 06-30-2005, 09:28 AM
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blueranger is a spoof ID used to harass....

As long as the position of the place where the tap occured is UP in relationship to gravity you will be pulling vapor...
Since I was among those who recommended a side tapper lately I wanted to be sure it was the concept of pulling from the vapor area was mentioned.... as compared to the blanket statement about which way the can was pointing...
I have not heard of any atomizers... and they will not atomize if only liquid refrigerant under pressure is supplied to them...
Compressors are way expensive in my book.....
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  #10  
Old 06-30-2005, 09:37 AM
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Agreed that compressors are to expensive and to big of hassle to be breaking. Thanks for the info.
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Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory
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  #11  
Old 06-30-2005, 09:42 AM
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R-12 Price

Blueranger -

Interesting. I bought 2 cans of R-12 on ebay last friday. Total refrigerant weight, using my newly honed "weights an measures" skills is 1.5 pounds.

Total cost was $25 delivered, or $16.60 per pound.

I think I got lucky, but even so, it's a long way from your $100/lb figure.

I just don't see any reason today to convert an A/C system to something other than the refrigerant it was designed for.
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  #12  
Old 06-30-2005, 09:50 AM
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I just got my side tapper, haven't used it yet. The puncture fitting on one side - does that screw out to put can in and then move back in after the can is locked in to puncture it? Dumb question I suppose.
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  #13  
Old 06-30-2005, 09:56 AM
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Pete if you have the side tapper I do I think you use the handles to push the tap into the can. That is your source of leverage as opposed to a screw on a top tapper.
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My Daily : 96 E-300 Diesel with 175,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory
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  #14  
Old 06-30-2005, 10:32 AM
LarryBible
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Quote:
Originally Posted by DieselJim
measuring in kgs or slugs would be better. Lbs is kind of a clumsy measurement for mass. It is unfortunate that weight and fluid measures both use onces in the english system. If you notice it says nt wt on the bottle instead of fl ozs. I don't remember if this is so I would suspect an fl oz of distilled water weights 1 oz. If so the system is even more screwed up think I think. If you struggle with mass concepts be sure to study extra hard before taking up this job. It is hard to keep straight.
I think we must have had the same physics professor.

Have a great day,
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  #15  
Old 06-30-2005, 10:35 AM
LarryBible
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Quote:
Originally Posted by techguy512
Blueranger -

Interesting. I bought 2 cans of R-12 on ebay last friday. Total refrigerant weight, using my newly honed "weights an measures" skills is 1.5 pounds.

Total cost was $25 delivered, or $16.60 per pound.

I think I got lucky, but even so, it's a long way from your $100/lb figure.

I just don't see any reason today to convert an A/C system to something other than the refrigerant it was designed for.
No, techguy, that is about the going rate for R12 these days. I just bought 30 pounds for $14.06 per pound. The shops that are charging $100 per pound are simply preying on those who don't know any better. When R12 really was at $45 per pound or so, it was hard to blame someone for using a junk refrigerant, but now the junk refrigerant will most DEFINITELY cost more in the long run, but very little less in the short term.

Have a great day,
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Old 06-30-2005, 10:35 AM
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