Anyone know how well these canadian tire recharge kits work for air conditioning recharge ? I just bought one of them hoping it will fix my A/C., any feedback appreciated .

thanks

 

I have fixed and recharged my ac a few times and can get it to blow 40 degrees. To do it right you have to pull a vaccum on the system for 30 minutes and then let it sit for 30 minutes to see if it leaks off. If you dont pull a vaccum then you only have about half the Suva in the system. Plus all the air is bad when its cooling because it will ice up.

You need a manifold set and pump. The little hoses work for adding but if you start with no charge you need a vaccum.

 

the vacuum allows moisture to flash off in the system - if you pull vacuum for a fixed amount of time, (say 30 minutes), then do a leak-down test and it shows a pressure rise, then you either didn't get all the moisture out of the system (most likely) or you still have leaks (less likely, 'cause the leak detection should have showed this.).

When we dry out power transformers, we drain all the insulating oil in them, then do a heat run in which we heat the oil back up and pump it back in - we continue to heat and circulate the oil till the core and coils are at 80 degrees C (regardless of size of the transformer). Heat is maintained for 24 hours, then the oil is removed under vacuum, we maintain vacuum to do two things:
it continues to assist in flashing off the moisture and
it makes the transformer act like a thermos - so it doesn't cool off as quickly.
The vacuum is maintained, and the vacuum vent matter is passed through an ice trap where any remaining moisture freezes and condenses so it can be measured.


I suspect air conditioning is similar - only not as tedious... A big 200 MVA power bank can take up to ten days to dry it out this way.

Oh, BTW - friends don't let friends shop at Canadian Tire.