Posted by glennster on September 11, 2012 at 12:46:23 from (75.57.143.173):
In Reply to: 1566 air conditioning posted by jdetig1 on September 11, 2012 at 11:30:40:
as far as charging, use about 80 % of r-134 as opposed to r-12. example if the system uses 2 lbs of r-12, 2 lb x .8 = 1.6 lbs of r-134. also, like super h mike said use ester oil. if you cant find the capacity of the system you can ball park it with charging gauges. low side pressure at about 80 degrees f should be around 45 to 48 psi. high side should be around 200 psi (roughly). evac the system with a vaccuum pump for about an hour, then let the vacccuum hold for another hour to see if there is a leak. (vaccuum will drop if leaking) generally about 28 inches of vaccuum is where we pull the system.
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