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Old 08-26-2010, 07:01 PM   #16
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Re: vacumming AC system question

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.
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Old 08-26-2010, 09:16 PM   #17
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Re: vacumming AC system question

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
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Old 08-26-2010, 09:22 PM   #18
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Re: vacumming AC system question

Probably gauge error, don't worry about it.
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Old 08-27-2010, 06:54 AM   #19
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Re: vacumming AC system question

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
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Old 08-27-2010, 09:27 AM   #20
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Re: vacumming AC system question

this is what i using i bought it from princess auto

http://www.princessauto.com/air/comp...5-vacuum-gauge
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Old 08-27-2010, 04:02 PM   #21
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Re: vacumming AC system question

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.
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Old 08-27-2010, 07:06 PM   #22
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Re: vacumming AC system question

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?
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Old 08-29-2010, 02:00 PM   #23
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Re: vacumming AC system question

How accurate is the gauge you're using?
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Old 08-29-2010, 05:44 PM   #24
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Re: vacumming AC system question

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
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Old 09-07-2010, 10:10 AM   #25
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Re: vacumming AC system question

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.
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Old 09-09-2010, 06:06 AM   #26
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Re: vacumming AC system question

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
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Old 09-09-2010, 01:00 PM   #27
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Re: vacumming AC system question

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.
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Old 09-09-2010, 11:16 PM   #28
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Re: vacumming AC system question

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
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