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Originally Posted by Galt

RCBS makes a good scale grams or grains 454 grams 7000 grains equal pound

Yes, but those scales for reloading typically top out at a much lower weight than we would need to weigh even a small, 1 pound container.

My Dillon scale wouldn't even weigh a full pound and it would probably damage it if I tried.

RCBS makes a good scale grams or grains 454 grams 7000 grains equal pound

Originally Posted by ICanHas

Very nice setup. Here 11.3 and 13.6 kg (25 and 30 lb) disposable tanks are the standard sizes for most refrigerants. They come in bigger sizes for industrial units. 134a does come in 12oz can primarily for automotive AC DIY.

Ohh..never been in a refrigeration jam before eh?

you will need one of these: http://www.napaonline.com/Catalog/Ca...425_0064418654

and this: http://www.napaonline.com/Catalog/Ca...009_0063111497

Originally Posted by shellkamp

I Looked for "drug dealer electronic scale" on Amazon with no luck. Is there a different brand name they go by?

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http://www.amazon.com/gp/search/ref=...nid=2941120011

Originally Posted by monkeyspanners

Wholesalers here sell a tiny scale, designed for the 1lb R600a etc cans. It has its own hose which is the very thin plastic pressure switch style with a bore of a few mm. Lots of domestic stuff here runs R600a or R290 and only has a few grams in.

Bit like this one http://www.duoitl.com/emainset.htm?id=pro02&xcode=06

Very nice setup. Here 11.3 and 13.6 kg (25 and 30 lb) disposable tanks are the standard sizes for most refrigerants. They come in bigger sizes for industrial units. 134a does come in 12oz can primarily for automotive AC DIY.

I use a Triton T2 and have been very happy with it.

http://www.amazon.com/s/ref=nb_sb_no...ords=triton+t2

Originally Posted by Joe Harper

Take a can of 134 from the auto parts store and small drug dealers electronic scale.

I Looked for "drug dealer electronic scale" on Amazon with no luck. Is there a different brand name they go by?

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Take a can of 134 from the auto parts store and small drug dealers electronic scale.

Wholesalers here sell a tiny scale, designed for the 1lb R600a etc cans. It has its own hose which is the very thin plastic pressure switch style with a bore of a few mm. Lots of domestic stuff here runs R600a or R290 and only has a few grams in.

Bit like this one http://www.duoitl.com/emainset.htm?id=pro02&xcode=06

I used to use a Dial a Charge until I dropped it

But have been successful with putting a stubby hose with ball valve on the condenser, purging to the ball valve with vapor, then opening the ball valve to control charge. That way there is little to know compensation for hoses. Use a mechanical scale (Shipping type scale) if you require extreme accuracy. I had a "Coffee Creamer Cooler" at a C-Store that had .34 lbs R-134a. Wasn't easy. Then found out They just replace them... cost more to repair than buy. Looking at the water cooler you are working on, can't be more than a couple hundred bucks. Buy the time you fix it, you'd have more in it than a new one would cost.

Attachment 468231

I'd like to find these.....

Attachment 468221

http://www.yellowjacket.com/content/...rgingHoses.pdf

Page 27 shows a chart with liquid ounces per foot of hose for different refrigerants.

Didn't you come up with some elaborate scheme to weigh in charges this small before?

Buy a medical grade diaper scale, or steal one from your local NICU. That's what drug dealers seem to use. Their measurements are a lot more critical than ours.

Take a ball valve hose connected directly to the refrigerant tank, ball valve end towards unit. Purge hose, charge unit by weight, close ball valve and you're done. Tare the scale when the hose is purged and full, of course.


If it costs the customer less for you to repair that thing than it does to replace it, you need to increase your labor rate

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Have you ever looked at the refrigeration system in these bottled water coolers? Don't worry about charging them. You will never have to do it. Unless there is a bad switch or thermostat, any other problems you throw them out.

0.90 ounces is about 25 grams - so if you use a gram scale graduated to tenths it would seem easy to be accurate. It's not going to be all That critical anyway. You could charge it by SSH at stabilized conditions and it would be close enough. I guess it would pay to use shutoff valve hoses though. <g> The factory probably weighs the whole unit on a gram scale as they install the charge. No one could afford to have these serviced for what a new one costs anyway.

PHM
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Originally Posted by ICanHas

http://www.crystalcoolers.com/Europe...ducts_E2O.aspx

How would you charge something like this with such a critical charge?
If there was a component changed, do you have to compensate for the difference in size?

just weigh in charge after vac ,pure liq. on discharge side and let it set for a few min.best is to precharge ur hoses br haveing a yellow jacket shutoff valve at end of hose then read scales till full weight is in, never failed me.

Originally Posted by hvac wiz 79

I don't understand the comparison lol

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My point is that you can never get accurate weighing using the least significant count on a scale.

Big truck scales reads to 20 lbs or so. If the spec calls for 75.00 lbs, you wouldn't use that scale to weigh in 75 lb by calling "when the scale reads 80" adequate.

Yellow Jacket Accu charge or Robinair Dial-a-charge heated charging cylinder should work fine.

this Accu charge for R134 has 1/4 oz for each mark. some come with 1/8 oz markings.

Originally Posted by ICanHas

About as accurate as trying to charge a package unit by weight from a cylinder still in a pallet on a fork lift that's on a platform scale. That is, using the reading from the platform scale.

I don't understand the comparison lol

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Move everything,the water cooler, the drum of 134 ,everything into a freezer that is -15f.use a medical syringe to add the proper charge!

Originally Posted by Some Dude

Those things hit the wall a few years ago when they stopped using copeland comp.

Well, the one i worked on yesterday had a techumseh. I don't think this was ever worked on it's entire life and to my dismay the suction stub on the compressor was kinked. Can't they do a better job piping. And the braze joints are just average. I expect pro welds!