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Where to buy gases from and HVAC Questions

post #1 of 10
10/26/05 at 8:04pm
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Where can you buy gases to charge systems with?? Like R22 and such?

Also what gases can you buy without a HVAC licence? And how to get a HVAC licence an how long does it take to get one??
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post #2 of 10
10/26/05 at 8:11pm
a fridge repair shop?
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post #3 of 10
10/26/05 at 8:12pm
Most gas supply stores could help. Like a welding shop but im not sure about frieon(sp?)...
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post #4 of 10
10/26/05 at 8:44pm
AFAIK, the only gases you can buy without a class 608 license are: R134, R12 (I believe), and R290, which is propane. The R12 and R134, which are used in vehicle refrigeration systems do not have the capacity to hold low temps in a computer application. A decent single stage phase changer can be made with R290. When using R290, the best temps that I have seen are idle evap temps of about -40C and load evap temps around -30 or so. This would be the cheapest/easiest route, as you can buy cans of propane at Walmart (the little Coleman cans used for gas camping stoves).

However, it is pretty easy to obtain a 608 Universal license with a little studying. Click HERE for more information.

And here is a place to buy gases online, if you are certified or course .

And it appears that R507 can be purchased without a license as well, as per this page. I know that many people use R507, but my understanding is that you have to use the proper compressor and/or a mix of R507 and another gas.
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post #5 of 10
10/26/05 at 9:26pm
Propane is explosive....so I don't think you should mess with that...
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post #6 of 10
10/26/05 at 9:30pm
Quote:
Originally Posted by bentrinh
Propane is explosive....so I don't think you should mess with that...
Many gases that people use are explosive. What most people don't realize is that the amount of gas used in a phase change system is very small; usually just a few ounces*. If you did spring a leak, the propane would just dissipate in the atmosphere. Now if you ran the unit in a sealed closet you could have some problems, but who does that? I don't know too many people that run their units next to a campfire .

Edit: I meant 'ounces' instead of 'grams'.
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post #7 of 10
10/26/05 at 9:36pm
a scout master would use a phase next to a camp fire ?
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post #8 of 10
10/26/05 at 9:40pm
Quote:
Originally Posted by Lando95
Many gases that people use are explosive. What most people don't realize is that the amount of gas used in a phase change system is very small; usually just a few grams. If you did spring a leak, the propane would just dissipate in the atmosphere. Now if you ran the unit in a sealed closet you could have some problems, but who does that? I don't know too many people that run their units next to a campfire .
funny you sould say that last year i went camping and one noght dicided to wip out the laptop in front of the fire, i did showed some pics to my cuzenz then put it away nothing happed
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post #9 of 10
10/26/05 at 9:47pm
Quote:
Originally Posted by Torched-Geek
a scout master would use a phase next to a camp fire ?
Yeah, but a scout master would not fill the system with gas while it's next to a campfire
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post #10 of 10
10/29/05 at 7:28am
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Quote:
Originally Posted by bobcool
funny you sould say that last year i went camping and one noght dicided to wip out the laptop in front of the fire, i did showed some pics to my cuzenz then put it away nothing happed
Laptops don't have phase-change....does it....?
Not bad at all...
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Not bad at all...
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