vacumming AC system question

[old_master]

Check with your local airport, they darn well better know what the elevation is! Or, if you do a google search for the airport, it will tell on their site.

[comet240]

ya i did it was like +624 feet above sea level for the peterborough airport but that means i still need to pull 29 not 27 lol doh

[old_master]

Probably gauge error, don't worry about it.

[comet240]

oh ok wasnt sure if i put a new dryer in it i wont care eitehr right? reason cuz i bought the vacumm gauge it screws on to 1/4 pipe thread so i just put a hose to the fridge compressor and thats how i get like 27 or 27.5 hg pull

[comet240]

this is what i using i bought it from princess auto

http://www.princessauto.com/air/comp...5-vacuum-gauge

[old_master]

That'll work, just needed to get creative with the plumbing, good job. After you replace the accumulator drier, evacuate for a minimum of one hour, the longer the better. The refrigerator compressor will run continuously without damaging it, provided it has oil in it. Let her suck down overnight if you want.

[comet240]

ya i had it only wired on the low side i had a duracool kit i cut the line in half and put the guage and that inbetween it with air fittings thats how i was able to pull like 27 or 27.5 but thats it is that gonna be ok sure ill go all night i know if i come back later after i unhooked for a while it has a small leak and i never oiledd the seals i didnt have oil for the compressor i replaced or orings lol i used motor oil on the other orings fro the rad for it but i figured it just o rings and when u put the sealent in it be fine right?

[RahX]

How accurate is the gauge you're using?

[comet240]

how would i know? u can see from the link the gauge im using and it goes to like 27 .5 cuz it has increments 25 25.5 26 26.5 27. and so on
i cant tell if its right or wrong i just let it suck down and comes to like 27 or 27.5 i cant remember right now

[jdmccright]

Typical gauge error is +/- 5% of full scale. But the listing you posted doesn't even note an error range, and given the price my guess is 5% is being hopeful.

But for you, 5% of 30 is 1.5 in Hg. So, theoretically you might be okay if you can pull down to 27.5 in Hg (27.5 + 1.5 gauge error = 29.0). But for this application, the lower the better.

[comet240]

ah ok ya go figure eh damn chinese products i dont have any other vacume guages to test with doh and i was gonna add in a can of mositure dryer from dura cool wouldnt that do the trick for moisture? if i cant get down to -29

[jdmccright]

I may be wrong, but from what I've read, Duracool is a R-12 replacement. Thus, it would not be compatible with your R-134a system.

[RahX]

If it doesn't specifically say r-134 (for an r-134 system) or r-12 (for an r-12 system) DO NOT USE IT. Just because it says it will work doesn't mean it is the right stuff. A lot of that stuff contains very flammable gases and will contaminate any machine you hook up to recover the refrigerant. Vacuum and desiccant are the ONLY two ways you should be drying out your A/C system.

INFO:

http://www.epa.gov/ozone/snap/refrigerants/hc-12a.html